JP7486607B2 - Disc brake - Google Patents

Description

The present invention relates to a disc brake for braking vehicles such as two-wheeled vehicles and four-wheeled automobiles.
This application claims priority based on Japanese Patent Application No. 2020-205022, filed in Japan on December 10, 2020, the contents of which are incorporated herein by reference.

A disc brake comprises a locking member that locks the friction pad so that it can move in the axial direction of the disc, and a pressing member that presses the friction pad against the disc. The friction pad has a lining material that contacts the disc, and a back plate to which the lining material is affixed. Some disc brakes have a structure in which an extension that extends in a direction inclined relative to the longitudinal direction of the friction pad is provided on the end side of the back plate in the disc rotation direction, and a pad locking portion having a flat portion that extends along the extension direction of the extension portion is provided on the locking member, and the extension portion of the friction pad is locked to the pad locking portion (see, for example, Patent Document 1).

International Publication No. 2019/244960

There is a need to suppress declines in productivity in disc brakes.

Therefore, the present invention aims to provide a disc brake that can suppress a decrease in productivity.

In order to achieve the above object, the present invention adopts the following aspects.
A disc brake according to one aspect of the present invention comprises a friction pad, a body member that engages the friction pad movably in the axial direction of the disc, and a pad spring that presses the friction pad against the radial inside of the disc, the friction pad comprising an extension portion that extends from a longitudinal end of the friction pad in a direction inclined toward the radial outside of the disc with respect to the longitudinal direction, and a base surface portion that extends from the extension portion toward the radial inside of the disc while being perpendicular to the longitudinal direction, the body member having a first flat portion aligned in the extension direction of the extension portion, a pad engagement portion to which the extension portion is engaged, and a pad spring that extends from the pad engagement portion toward the radial inside of the disc and is configured to engage with the extension portion of the base surface portion. The pad spring is provided with a torque receiving portion having a second flat surface portion along the exit direction and against which the base surface portion abuts, and a locking surface portion provided on the inner part of the radial direction of the disk of the intermediate connecting portion which is arranged so as to straddle the disk in the disk axial direction on the outer side of the disk, facing inward in the radial direction of the disk, and wherein, when viewed in the axial direction of the disk, a plane perpendicular to the second flat surface portion is inclined at an acute angle from a part extending from the boundary line between the locking surface portion and an engagement surface on the disk exit side provided on the wall surface of the intermediate connecting portion toward the disk entry side, and the pad spring is attached at an angle relative to the plane perpendicular to the second flat surface portion when viewed in the axial direction of the disk by abutting against the locking surface portion .

A disc brake according to another aspect of the present invention is a friction pad having an extension portion extending from a longitudinal end of the friction pad in a direction inclined toward the radially outer side of the disc with respect to the longitudinal direction, and a base surface portion extending from the extension portion toward the radially inner side of the disc while being perpendicular to the longitudinal direction; and a body member that engages the friction pad so as to be movable in the axial direction of the disc, the body member having a pad engaging portion that has a first flat portion aligned with the extension direction of the extension portion and to which the extension portion is engaged, and a pad engaging portion that is provided extending from the pad engaging portion toward the radially inner side of the disc and is inclined toward the radially outer side of the disc with respect to the longitudinal direction, the pad engaging portion having a first flat portion aligned with the extension direction of the extension portion and to which the extension portion is engaged, and a base surface portion that is provided extending from the pad engaging portion toward the radially inner side of the disc and inclined toward the radially inner side of the disc with respect to the extension direction of the base surface portion. the intermediate connecting part is disposed so as to straddle the disk in the disk axial direction on the radially outer side of the disk, and a body member having a torque receiving part with which the base surface part abuts and a locking surface part facing inward in the disk radial direction, the locking surface part being provided on an inner part in the disk radial direction of the intermediate connecting part and arranged so as to straddle the disk in the disk axial direction on the radially outer side of the disk; and a pad spring which is attached so that, when viewed in the axial direction of the disk, an angle formed by a plane perpendicular to the second planar part and a part extending from a boundary line between the locking surface part and an engagement surface on the disk rotation side provided on the wall of the intermediate connecting part towards the disk rotation side is inclined , and which presses the friction pad against the radially inner side of the disk.

According to each of the above aspects of the present invention, it is possible to provide a disc brake that can suppress a decrease in productivity.

1 is a view of a disk brake according to an embodiment of the present invention, viewed from the outside in the disk radial direction. 2 is a view taken along the arrow II in FIG. 1 , showing the disk brake of the embodiment. 3 is a view taken along the arrow III in FIG. 1 , showing the disk brake of the embodiment. FIG. 2 is a view of the disk brake of the embodiment as viewed from the inside in the disk radial direction. 2 is a cross-sectional view taken along the line VV in FIG. 1, showing the disk brake of the embodiment. FIG. 2 is a cross-sectional view showing a pad spring of the disc brake of the embodiment. FIG. 2 is a cross-sectional view showing a pad spring of the disc brake of the embodiment. 5A to 5C are diagrams illustrating the relationship of forces applied from a pad spring to a friction pad of the disc brake of the embodiment. 5A to 5C are diagrams illustrating the relationship of forces applied from a pad spring to a friction pad of the disc brake of the embodiment. 5A to 5C are diagrams illustrating the relationship of forces applied from a pad spring to a friction pad of the disc brake of the embodiment.

An embodiment of the present invention will be described with reference to the drawings. The disc brake 10 of this embodiment is an opposed piston type disc brake for braking the front wheel of a motorcycle. However, the present invention is not limited to this, and can of course also be applied to disc brakes for braking the rear wheel of a motorcycle or for braking a four-wheeled vehicle.

As shown in Figures 1 to 5, the disc brake 10 includes a disk-shaped disc 11 that rotates with the wheel to be braked, and a caliper 12 that is attached to the vehicle body and applies frictional resistance to the disc 11. In the following, the radial direction of the disc 11 is referred to as the disc radial direction, the central axis of the disc 11 is referred to as the disc axis, the extension direction of the disc axis is referred to as the disc axial direction, and the rotation direction (circumferential direction) of the disc 11 is referred to as the disc rotation direction. In addition, the center side of the disc 11 in the disc radial direction is referred to as the inner side of the disc radial direction, and the opposite side of the center of the disc 11 in the disc radial direction is referred to as the outer side of the disc radial direction. In addition, the exit side in the rotation direction R of the disc 11 when the vehicle to which the disc brake 10 is attached is traveling forward is referred to as the disc rotation exit side, and the entrance side in the rotation direction R of the disc 11 when traveling forward is referred to as the disc rotation entrance side.

The caliper 12 has a caliper body 15 (body member) that is disposed across the outer periphery of the disc 11 and fixed to the vehicle body as shown in Figures 1 to 3, and four identically shaped pistons 16 that are housed in the caliper body 15 as shown in Figures 2 to 4. In this embodiment, a line that passes through the disc axis of the disc 11 and the center of the caliper body 15 in the disc rotation direction and runs along the disc radial direction is referred to as the disc radial reference line, and the extension direction of this disc radial reference line is referred to as the reference line direction. The disc radial reference line is perpendicular to the disc axis.

In the caliper 12, two pistons 16 are provided in pairs on both sides of the disk 11 in the disk axial direction, with the positions aligned in the disk radial direction and the disk rotation direction. Two pairs of such configurations are provided at a predetermined interval in the disk rotation direction. In other words, in the caliper 12, one piston 16 and one piston 16 are provided on one side of the disk axial direction of the disk 11, with the positions aligned in the disk radial direction and the disk axial direction, with the positions aligned in the disk radial direction and the disk axial direction, with the positions aligned in the disk rotation direction. Such configurations are provided on both sides of the disk 11 in the disk axial direction. Thus, the caliper 12 is an opposed piston type four-pot caliper. Note that there needs to be at least one pair of pistons sandwiching the disk 11, and three or four pairs may be provided in addition to the above two pairs. Furthermore, the number of pistons may be different on both sides of the disk axial direction of the disk 11, such as one and two, or two and three.

1, the caliper body 15 has a cylinder portion 21 arranged on the outer side of the disk 11 in the disk axial direction (the side opposite the wheel relative to the disk 11), a cylinder portion 22 arranged on the inner side of the disk 11 (the side opposite the wheel relative to the disk 11), an end side connecting portion 23 connecting one end of the cylinder portion 21 and the cylinder portion 22 in the disk rotation direction, an end side connecting portion 24 connecting the other end of the cylinder portion 21 and the cylinder portion 22 in the disk rotation direction, and an intermediate connecting portion 25 connecting the intermediate portions of the cylinder portion 21 and the cylinder portion 22 in the disk rotation direction. The end side connecting portion 23, the end side connecting portion 24 and the intermediate connecting portion 25 are all arranged so as to straddle the disk 11 in the disk axial direction on the outer side of the disk radial direction. In other words, the caliper body 15 has a pair of end connecting portions 23, 24 that connect the pair of cylinder portions 21, 22 across the disk 11 at the ends of the pair of cylinder portions 21, 22 in the disk rotation direction, and an intermediate connecting portion 25 that connects the pair of cylinder portions 21, 22 across the disk 11 at an intermediate portion of the pair of cylinder portions 21, 22 in the disk rotation direction.

The caliper body 15 is a monoblock caliper in which the cylinder section 21, the cylinder section 22, the end connecting section 23, the end connecting section 24 and the intermediate connecting section 25 are formed as a single piece by casting. Therefore, the cylinder section 21 and the cylinder section 22 are formed seamlessly as a single piece via the end connecting section 23, the end connecting section 24 and the intermediate connecting section 25.

As shown in Figure 4, the outer cylinder section 21 is disposed opposite the outer surface of the disk 11. The outer cylinder section 21 has an attachment boss section 34 disposed on the end side connecting section 23 side, which is one end in the disk rotation direction, and an attachment boss section 35 disposed on the end side connecting section 24 side, which is the other end in the disk rotation direction.

The cylinder section 21 is long in the disk rotation direction to accommodate multiple pistons 16 arranged in the disk rotation direction. As shown in FIG. 2, the cylinder section 21 has two cylinder bores 38, 39 arranged in the disk rotation direction to accommodate the pistons 16 so that they can move in the disk axial direction. One of the cylinder bores 38, 39 is located closer to the end side connecting section 23 than the center of the disk rotation direction of the cylinder section 21, and the other cylinder bore 39 is located closer to the end side connecting section 24 than the center of the disk rotation direction of the cylinder section 21. The cylinder bores 38, 39 open to the disk 11 side in the disk axial direction.

As shown in Figure 1, a supply/discharge port 41 for supplying and discharging brake fluid to the cylinder bores 38, 39 is formed at the center of the cylinder portion 21 in the disk rotation direction. The supply/discharge port 41 is formed parallel to the disk radial reference line.

Mounting boss 34 has a mounting hole 44, and mounting boss 35 has a mounting hole 45, both of which penetrate in the disk radial direction. These mounting holes 44, 45 are parallel to the disk radial reference line, and are formed at equidistant positions from the center of caliper body 15 in the disk rotation direction, with their positions aligned with each other in the disk axial direction. Caliper 12 is fixed to the vehicle body side with mounting bolts (not shown) that are inserted through these mounting holes 44, 45, and is of the so-called radial mount type.

The caliper 12 has a bleeder plug 48 for bleeding air, and a bleeder boss 49 to which the bleeder plug 48 is attached is formed on the end connecting portion 23 of the caliper body 15. The caliper body 15 is disposed on the rear side of the disk 11 in the vehicle longitudinal direction, with the end connecting portion 23 on which the bleeder boss 49 is formed disposed on the upper side in the vertical direction. Therefore, when the vehicle travels forward, the disk 11 moves vertically from bottom to top relative to the caliper body 15. In the caliper body 15, one end connecting portion 23 on which the bleeder boss 49 is disposed is disposed on the disk rotation outgoing side, and the other end connecting portion 24 is disposed on the disk rotation ingoing side.

As shown in FIG. 4, the inner cylinder section 22 is disposed opposite the inner surface of the disk 11. As shown in FIG. 3, the inner cylinder section 22 is long along the disk rotation direction to accommodate two pistons 16 arranged in the disk rotation direction. Two cylinder bores 58, 59 are formed in the cylinder section 22 in a line along the disk rotation direction to accommodate the pistons 16 so that they can move in the disk axial direction. One cylinder bore 58 is disposed closer to the end side connecting section 23 side than the center of the disk rotation direction of the cylinder section 22, and the other cylinder bore 59 is disposed closer to the end side connecting section 24 side than the center of the disk rotation direction of the cylinder section 22. The cylinder bores 58, 59 open to the disk 11 side in the disk axial direction. The supply/discharge port 41 of the outer cylinder portion 21 shown in Fig. 1 supplies/discharges brake fluid to/from the cylinder bores 58, 59 of the cylinder portion 22 shown in Fig. 3 in addition to the cylinder bores 38, 39 of the cylinder portion 21 shown in Fig. 2. The cylinder bores 38, 39, 58, 59 have the same diameter.

In the caliper body 15, the cylinder portion 21 shown in Figures 1 and 2 and the cylinder portion 22 shown in Figures 1 and 3 are arranged facing each other in the disk axial direction, with their positions overlapping in the disk rotation direction and the disk radial direction. The cylinder bore 58 is formed coaxially with the cylinder bore 38, and the cylinder bore 59 is formed coaxially with the cylinder bore 39.

As shown in FIG. 1, the end side connecting portion 23 on the disk rotation side has a pad support portion 32A and a pad support portion 33B on the end side connecting portion 24 side in the disk rotation direction. The pad support portion 32A is arranged on the outer side of the disk 11, and the pad support portion 33B is arranged on the inner side of the disk 11. The end side connecting portion 24 on the disk rotation side has a pad support portion 32B and a pad support portion 33A on the end side connecting portion 23 side in the disk rotation direction. The pad support portion 33A is arranged on the outer side of the disk 11, and the pad support portion 32B is arranged on the inner side of the disk 11. Thus, the end side connecting portion 23 has the pad support portions 32A and 33B on both sides of the disk 11 in the disk axial direction. The end side connecting portion 24 has the pad support portions 32B and 33A on both sides of the disk 11 in the disk axial direction. In other words, the end side connecting portions 23 and 24 are provided with the pad support portions 32A, 33B, 32B, and 33A. In the caliper body 15, the pad support portions 32A and 33B are arranged on the disc exit side, and the pad support portions 32B and 33A are arranged on the disc entry side.

The pad support parts 32A and 33B on the disk rotation exit side shown in Figures 1 and 4 face each other in the disk axial direction, overlapping their positions in the disk rotation direction and the disk radial direction. The pad support parts 33A and 32B on the disk rotation entry side face each other in the disk axial direction, overlapping their positions in the disk rotation direction and the disk radial direction. As shown in Figure 4, the disk 11 is arranged between the pad support parts 32A and 33A on the outer side and the pad support parts 32B and 33B on the inner side.

The pad support parts 32A and 33A on the outer side are mirror symmetrical in the disk rotation direction. The pad support parts 32B and 33B on the inner side are mirror symmetrical in the disk rotation direction. The pad support parts 32A and 33B on the disk rotation side are mirror symmetrical in the disk axial direction. The pad support parts 32B and 33A on the disk rotation side are mirror symmetrical in the disk axial direction. The pair of end side connecting parts 23, 24 connect the pair of cylinder parts 21, 22 across the disk 11 at the ends of the pair of cylinder parts 21, 22 in the disk rotation direction.

The caliper body 15 is surrounded by the cylinder parts 21 and 22 and the pad support parts 32A, 32B, 33A, and 33B, and has a pad arrangement space 61 that is open to both sides in the disk radial direction at approximately the center. The entire inner side of the pad arrangement space 61 in the disk radial direction is open. As shown in FIG. 1, the intermediate connection part 25 is provided at the center position of the caliper body 15 in the disk rotation direction, and is provided across the pad arrangement space 61 in the disk axial direction on the outer side of the disk radial direction. Therefore, the outer side of the pad arrangement space 61 in the disk radial direction is open at the part between the pad support parts 32A and 33B and the intermediate connection part 25 on the disk rotation side, and the part between the pad support parts 32B and 33A and the intermediate connection part 25 on the disk rotation side. The cylinder bores 38 and 39 shown in FIG. 2 and the cylinder bores 58 and 59 shown in FIG. 3 are open to the pad arrangement space 61 shown in FIG. 4. The disk 11 crosses the center position of the pad arrangement space 61 in the disk axial direction in the disk rotation direction.

Here, the caliper body 15 is formed by casting the cylinder portion 21, the cylinder portion 22, the end side connecting portion 23, the end side connecting portion 24, and the intermediate connecting portion 25 shown in FIG. 1, seamlessly and integrally except for the bottom of the cylinder bore 58, 59 of the cylinder portion 22 shown in FIG. 3. Then, the inner surfaces of the cylinder bores 38, 39, 58, 59 are machined through the cast openings at the bottom of these two cylinder bores 58, 59 of the cylinder portion 22. After this, a separate blocking member is joined to the openings at the bottom of the cylinder bores 58, 59 of the cylinder portion 22 by friction stir welding to block the openings and form the bottom, thereby forming the caliper body 15. It is also possible to integrally mold the entire cylinder portion 21, the cylinder portion 22, the end side connecting portion 23, the end side connecting portion 24, and the intermediate connecting portion 25 by casting, and machine the inner surfaces of the cylinder bores 38, 39, 58, 59 from the pad arrangement space 61 between the cylinder portions 21 and 22.

As shown in FIG. 5, the inner pad support portion 33B of the end-side connecting portion 23 on the disk rotation side has a torque receiving surface 81B (second flat portion) facing the pad arrangement space 61, a rotor-facing surface 82B facing the disk 11, and a flat portion 83B (first flat portion) facing the disk radially outward and toward the pad arrangement space 61. The torque receiving surface 81B is a flat surface extending parallel to the disk radial reference line and also extending parallel to the disk axis. The rotor-facing surface 82B extends perpendicular to the disk axis. The flat portion 83B is a flat surface extending parallel to the disk axis and is inclined in the reference line direction so that the flat portion 83B is more distant from the disk radial reference line as it approaches the disk radially outward. An obtuse angle is formed between the flat portion 83B and the torque receiving surface 81B.

The pad support portion 33B has a pad engaging portion 85B including a flat portion 83B at its radially outer end, and a portion radially inward of the pad engaging portion 85B is a torque receiving portion 86B including a torque receiving surface 81B. The torque receiving portion 86B extends radially inward from the pad engaging portion 85B. The torque receiving portion 86B is provided continuously from the pad engaging portion 85B. The torque receiving surface 81B is provided continuously from the flat portion 83B of the pad engaging portion 85B.

The inner pad support portion 32B of the end-side connecting portion 24 on the disk entry side has a torque receiving surface 71B (second flat surface portion) facing the pad arrangement space 61, a rotor-facing surface 72B facing the disk 11, and a flat surface portion 73B (first flat surface portion) facing the disk radially outward and the pad arrangement space 61. The torque receiving surface 71B is a flat surface extending parallel to the disk radial reference line and also parallel to the disk axis. The rotor-facing surface 72B extends perpendicular to the disk axis and is disposed on the same plane as the rotor-facing surface 82B. The flat surface portion 73B is a flat surface extending parallel to the disk axis and is inclined in the reference line direction so that it is more distant from the disk radial reference line as it approaches the disk radially outward. The flat surface portion 73B and the torque receiving surface 71B form an obtuse angle, which is equal to the angle between the flat surface portion 83B and the torque receiving surface 81B.

The pad support portion 32B has a pad engaging portion 75B including a flat portion 73B at its outer end in the disk radial direction, and a portion inward in the disk radial direction from the pad engaging portion 75B is a torque receiving portion 76B including a torque receiving surface 71B. The torque receiving portion 76B extends inward in the disk radial direction from the pad engaging portion 75B. The torque receiving portion 76B is provided continuously from the pad engaging portion 75B. The torque receiving surface 71B is provided continuously from the flat portion 73B of the pad engaging portion 75B. The pad engaging portions 75B and 85B are mirror symmetrical in the disk rotation direction. The torque receiving portions 76B and 86B are also mirror symmetrical in the disk rotation direction.

As shown in FIG. 4, the outer pad support portion 32A of the end-side connecting portion 23 on the disk rotation side has a torque receiving surface 71A (second flat surface portion) facing the pad arrangement space 61 and a rotor-facing surface 72A facing the disk 11, and a flat surface portion 73A (first flat surface portion) facing the disk radially outward and the pad arrangement space 61 as shown in FIG. 1 is formed. The torque receiving surface 71A shown in FIG. 4 is a flat surface extending parallel to the disk radial reference line and also parallel to the disk axis line. The rotor-facing surface 72A extends perpendicular to the disk axis line. The torque receiving surface 71A is disposed on the same plane as the torque receiving surface 81B. The flat surface portion 73A shown in FIG. 1 is a flat surface extending parallel to the disk axis line and is inclined so as to move away from the disk radial reference line as it approaches the outer side in the disk radial direction in the reference line direction. The flat surface portion 73A is disposed on the same plane as the flat surface portion 83B. The flat surface 73A and the torque receiving surface 71A shown in FIG. 4 form an obtuse angle, which is equal to the angle formed between the flat surface 83B and the torque receiving surface 81B shown in FIG.

As shown in Figure 1, the pad support portion 32A has a pad engagement portion 75A including a flat portion 73A at its outer end in the disk radial direction, and a portion inward in the disk radial direction from the pad engagement portion 75A is a torque receiving portion 76A including a torque receiving surface 71A as shown in Figure 4. The torque receiving portion 76A extends inward in the disk radial direction from the pad engagement portion 75A. The torque receiving portion 76A is provided continuously from the pad engagement portion 75A shown in Figure 1. The torque receiving surface 71A shown in Figure 4 is provided continuously from the flat portion 73A of the pad engagement portion 75A shown in Figure 1.

As shown in FIG. 4, the outer pad support portion 33A of the end-side connecting portion 24 on the disk entry side has a torque receiving surface 81A (second flat surface portion) facing the pad arrangement space 61 and a rotor-facing surface 82A facing the disk 11, and a flat surface portion 83A (first flat surface portion) facing the disk radially outward and the pad arrangement space 61 as shown in FIG. 1 is formed. The torque receiving surface 81A shown in FIG. 4 is a flat surface extending parallel to the disk radial reference line and also extending parallel to the disk axis line. The torque receiving surface 81A is disposed on the same plane as the torque receiving surface 71B. The rotor-facing surface 82A extends perpendicular to the disk axis line and is disposed on the same plane as the rotor-facing surface 72A. The flat surface portion 83A shown in FIG. 1 is a flat surface extending parallel to the disk axis line and is inclined so as to move away from the disk radial reference line as it approaches the disk radially outward in the reference line direction. The flat surface portion 83A is disposed on the same plane as the flat surface portion 73B. The flat surface portion 83A and the torque receiving surface 81A shown in FIG. 4 form an obtuse angle, which is equal to the angle formed between the flat surface portion 83B and the torque receiving surface 81B shown in FIG.

1, the pad support portion 33A has a pad engaging portion 85A including a flat portion 83A at its radially outer end, and a portion radially inward of the pad engaging portion 85A is a torque receiving portion 86A including a torque receiving surface 81A as shown in FIG. 4. The torque receiving portion 86A extends radially inward from the pad engaging portion 85A. The torque receiving portion 86A is provided continuously from the pad engaging portion 85A shown in FIG. 1. The torque receiving surface 81A shown in FIG. 4 is provided continuously from the flat portion 83A of the pad engaging portion 85A shown in FIG. 1. The pad engaging portions 75A, 85A are mirror-symmetrical in the disk rotation direction, and the torque receiving portions 76A, 86A shown in FIG. 4 are also mirror-symmetrical in the disk rotation direction.

The torque receiving surfaces 71A, 81B, which are arranged in the same plane, are parallel to the torque receiving surfaces 71B, 81A, which are arranged in the same plane. These torque receiving surfaces 71A, 71B, 81A, 81B are parallel to a plane that includes the disk radial reference line and the disk axis, and are arranged at equidistant positions from this plane. A plane that is perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis is perpendicular to the disk radial reference line.

As shown in Figure 1, the intermediate connecting part 25 has an engagement recess 91 and an engagement recess 92 with equal widths in the disk axial direction formed on the disk outlet side and the disk inlet side. The engagement recess 91 on the disk outlet side is recessed from the wall surface of the disk outlet side of the intermediate connecting part 25 towards the disk inlet side, and the engagement recess 92 on the disk inlet side is recessed from the wall surface of the disk inlet side of the intermediate connecting part 25 towards the disk outlet side.

The engagement recess 91 has a flat engagement surface 93 on the inner side in the recess direction. The engagement recess 91 is formed by cutting, including the engagement surface 93. The engagement surface 93 extends parallel to the disk axis. The engagement surface 93 is inclined with respect to the disk radial reference line so that the distance from the disk radial reference line increases toward the inner side in the disk radial direction, as shown in FIG. 5.

The engagement recess 92 has a flat engagement surface 94 at the rear side in the recess direction. The engagement recess 92 is formed by cutting, including the engagement surface 94. The engagement surface 94 extends parallel to the disk axis. The engagement surface 94 is inclined with respect to the disk radial reference line so that the distance from the disk radial reference line increases the further inward in the disk radial direction. The engagement surfaces 93 and 94 have the same angle between the disk radial reference line and a plane including the disk axis, and are the same distance from this plane.

The intermediate connecting portion 25 has a flat engaging surface portion 96 on its inner side in the disk radial direction, which faces inward in the disk radial direction. The engaging surface portion 96 is formed by cutting. The engaging surface portion 96 spreads parallel to the disk axis. The engaging surface portion 96 is inclined so that the disk rotation side is located radially outward in the reference line direction than the disk rotation side. In other words, the engaging surface portion 96 does not intersect with the disk radial reference line, but is perpendicular to it. When the caliper body 15 is viewed from the disk axial direction, the engaging surface portion 96 is inclined so as to form an acute angle with respect to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, and 81B and parallel to the disk axial direction. In other words, this plane is extended from the boundary line between the engaging surface portion 96 and the engagement surface 93 on the disk rotation side to the disk rotation side, and the angle between this extended portion and the engaging surface portion 96, which is the angle of inclination of the engaging surface portion, is acute. The angle that the locking surface portion 96 makes with the engagement surface 93 on the disk rotation side is larger than the angle that the locking surface portion 96 makes with the engagement surface 94 on the disk rotation side.

Here, although the inclination angle of the locking surface portion is a small angle, the locking surface portion 96 is inclined so that the disk rotation side is always located radially outward of the disk in the reference line direction relative to the disk rotation side, provided that it is within the range of the dimensional tolerance. In other words, the locking surface portion 96 is shaped so that it is rotated about a line parallel to the disk axis so that, provided that it is within the range of the dimensional tolerance, it is always located radially inward of the locking surface portion 96, perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B, and has a greater distance from a plane parallel to the disk axis on the disk rotation side than on the disk rotation side.

The caliper 12 has a pad spring 101 attached to the radially inner side of the intermediate connecting portion 25 of the caliper body 15, and a pair of identically shaped friction pads 102 arranged radially inner side of the pad spring 101 and pressed radially inward by the pad spring 101.

The pad spring 101 abuts against the locking surface 96 of the intermediate connecting portion 25 and engages with the engagement recesses 91, 92 to be attached to the intermediate connecting portion 25. The caliper body 15 supports a pair of friction pads 102, which are pressed radially inward by the pad spring 101, on the inner side of the disk radial direction. At this time, the caliper body 15 locks the pair of friction pads 102 so that they can move in the disk axial direction. As shown in FIG. 4, the pair of friction pads 102 are arranged in the pad arrangement space 61 of the caliper body 15. At this time, the pair of friction pads 102 are arranged opposite the disk 11. One of the friction pads 102 is arranged between the outer cylinder portion 21 and the disk 11. The other friction pad 102 is arranged between the inner cylinder portion 22 and the disk 11.

The pad spring 101 is formed by punching and bending a plate material of a certain thickness by press molding, and has a base plate portion 111 and a pair of engagement plate portions 112, 113 as shown in Figure 5, and four extension plate portions 114, 115, 116, 117 and a pair of pressure plate portions 118, 119 as shown in Figure 1. Figures 6A and 6B show the pad spring 101 in its natural state before being assembled to the caliper body 15. Here, we will first explain the pad spring 101 in its natural state before being assembled to the caliper body 15.

The substrate portion 111 is a flat, approximately rectangular plate.

The pair of engaging plate portions 112, 113 have the same shape and are mirror images of each other. The pair of engaging plate portions 112, 113 are roughly S-shaped. One of the pair of engaging plate portions 112 is provided at the middle position of one edge portion of the substrate portion 111, and the other engaging plate portion 113 is provided at the middle position of the edge portion opposite to the one edge portion of the substrate portion 111. The pair of engaging plate portions 112, 113 extend from the substrate portion 111 to the same side in the thickness direction of the substrate portion 111.

The extending plate portions 114, 115, 116, and 117 are all flat. The extending plate portions 114 and 115 are provided at one edge portion of the substrate portion 111 where the engaging plate portion 112 is provided, so as to sandwich the engaging plate portion 112 between them. The extending plate portions 116 and 117 are provided at the other edge portion of the substrate portion 111 where the engaging plate portion 113 is provided, so as to sandwich the engaging plate portion 113 between them. The extending plate portions 114 and 115 extend in the opposite direction to the extending plate portions 116 and 117 from the substrate portion 111 along the direction in which the substrate portion 111 spreads. The extending plate portions 116 and 117 extend in the opposite direction to the extending plate portions 114 and 115 from the substrate portion 111 along the direction in which the substrate portion 111 spreads. The extending plate portions 114 , 115 , 116 , and 117 are inclined at equal obtuse angles relative to the base portion 111 so that the farther they are from the base portion 111 , the more opposite they are to the engaging plate portions 112 and 113 in the thickness direction of the base portion 111 .

The extension plate portions 114 and 115 have a mirror symmetrical shape with the engagement plate portion 112 sandwiched between them. The extension plate portions 116 and 117 have a mirror symmetrical shape with the engagement plate portion 113 sandwiched between them. The extension plate portions 114 and 116 have a mirror symmetrical shape with the base plate portion 111 sandwiched between them. The extension plate portions 115 and 117 have a mirror symmetrical shape with the base plate portion 111 sandwiched between them.

The pair of pressure plate portions 118, 119 are flat plates of the same approximately rectangular shape. One pressure plate portion 118 connects the edge portions of the extension plate portions 114, 115 on the side opposite the base plate portion 111. The pressure plate portion 118 extends from the extension plate portions 114, 115 in the opposite direction to the base plate portion 111 along the direction in which the base plate portion 111 expands. The angle that the pressure plate portion 118 makes with the base plate portion 111 is larger than the angle that the extension plate portions 114, 115 make with the base plate portion 111, and the pressure plate portion 118 is disposed approximately parallel to the base plate portion 111.

The other pressure plate portion 119 connects the edge portions of the extension plate portions 116, 117 on the opposite side to the base plate portion 111. The pressure plate portion 119 extends from the extension plate portions 116, 117 in the opposite direction to the base plate portion 111 along the direction in which the base plate portion 111 expands. The angle that the pressure plate portion 119 makes with the base plate portion 111 is larger than the angle that the extension plate portions 116, 117 make with the base plate portion 111, and the pressure plate portion 119 is provided approximately parallel to the base plate portion 111. The pair of pressure plate portions 118, 119 have a mirror symmetrical shape with the extension plate portions 114, 115, the base plate portion 111, and the extension plate portions 116, 117 sandwiched between them.

The pad spring 101 has a mirror-symmetric shape in the left-right direction and also in the front-back direction when, for example, the pressure plate 118 and the extension plate portions 114, 115 are arranged on the right side, the pressure plate 119 and the extension plate portions 116, 117 are arranged on the left side, the pair of extension plate portions 114, 116 are arranged on the front side (near side), and the extension plate portions 115, 117 are arranged on the rear side (rear side). Therefore, the pad spring 101 has the same shape even when rotated 180 degrees around the central axis along the thickness direction of the base plate portion 111.

As a result, pad spring 101 is approximately symmetrical when viewed in the direction connecting extending plate portions 114, 116 and extending plate portions 115, 117. Pad spring 101 is arranged such that the direction connecting extending plate portions 114, 116 and extending plate portions 115, 117 is the disk axial direction. Therefore, pad spring 101 is approximately symmetrical when viewed in the disk axial direction.

As shown in FIG. 5, the pad spring 101 is attached to the caliper body 15 on the radially inner side of the intermediate connection portion 25 of the caliper body 15. At that time, the pad spring 101 is attached to the caliper body 15 so that the engagement plate portion 112 abuts against the engagement surface 93 of the engagement recess 91 of the intermediate connection portion 25, the engagement plate portion 113 abuts against the engagement surface 94 of the engagement recess 92 of the intermediate connection portion 25, and the base plate portion 111 abuts against the locking surface portion 96 of the intermediate connection portion 25 in surface contact. The pad spring 101 is attached to the caliper body 15 by the engagement plate portions 112 and 113 sandwiching the intermediate connection portion 25 while elastically deforming. At that time, the pad spring 101 is attached to the caliper body 15 by the base plate portion 111 abutting against the locking surface portion 96 of the intermediate connection portion 25 in surface contact. Therefore, the locking surface portion 96 of the caliper body 15 becomes a reference surface when attaching the pad spring 101.

The pad spring 101 is positioned in the pad arrangement space 61 of the caliper body 15 in the disk axial direction relative to the caliper body 15. The pad spring 101 is therefore positioned in all directions relative to the caliper body 15 by being placed in the pad arrangement space 61 of the caliper body 15 and being in surface contact with the locking surface portion 96 of the intermediate connecting portion 25 at the base plate portion 111 and clamping the intermediate connecting portion 25 at the engagement plate portions 112, 113.

Here, since the pad spring 101 has a mirror-symmetrical shape in the front-to-back and left-to-right directions as described above, even if it is attached to the caliper body 15 inverted in the disk rotation direction, it will be in the same state as described above with respect to the caliper body 15.

Here, for the pad spring 101, of the pair of engagement plate parts, the engagement plate part that engages with the engagement recess 91 on the disk rotation side is referred to as engagement plate part 112, and the engagement plate part that engages with the engagement recess 92 on the disk rotation side is referred to as engagement plate part 113. Also, as shown in FIG. 1, of the four extension plate parts, the extension plate part arranged on the disk rotation side and outer side is referred to as extension plate part 114, the extension plate part arranged on the disk rotation side and inner side is referred to as extension plate part 115, the extension plate part arranged on the disk rotation side and outer side is referred to as extension plate part 116, and the extension plate part arranged on the disk rotation side and inner side is referred to as extension plate part 117. Also, of the pair of pressure plate parts, the pressure plate part arranged on the disk rotation side is referred to as pressure plate part 118, and the pressure plate part arranged on the disk rotation side is referred to as pressure plate part 119.

5, the engagement plate portion 112 extends radially outward from the edge of the base plate portion 111 on the disk rotation side and engages with the engagement recess 91 of the intermediate connecting portion 25. The engagement plate portion 113 extends radially outward from the edge of the base plate portion 111 on the disk rotation side and engages with the engagement recess 92 of the intermediate connecting portion 25.

As shown in Figure 5, the pair of extension plate portions 114, 115 on the disk rotation exit side extend from the edge of the disk rotation exit side of the substrate portion 111 towards the disk rotation exit side. The pressure plate portion 118 on the disk rotation exit side extends from the edge of the disk rotation exit side of the pair of extension plate portions 114, 115 towards the disk rotation exit side. As shown in Figure 5, the pair of extension plate portions 116, 117 on the disk rotation entry side extend from the edge of the disk rotation entry side of the substrate portion 111 towards the disk rotation entry side. The pressure plate portion 119 on the disk rotation entry side extends from the edge of the disk rotation entry side of the pair of extension plate portions 116, 117 towards the disk rotation entry side.

As described above, the pad spring 101 is attached to the caliper body 15 with the base plate portion 111 in surface contact with the locking surface portion 96 of the intermediate connecting portion 25. In other words, the base plate portion 111 of the pad spring 101 is in parallel contact with the locking surface portion 96 of the intermediate connecting portion 25. Here, as described above, the locking surface portion 96 is inclined with respect to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, and 81B and parallel to the disk axis when the caliper body 15 is viewed from the disk axis direction. Therefore, the pad spring 101 is also attached at an angle with respect to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, and 81B and parallel to the disk axis when viewed from the disk axis direction. That is, the pad spring 101 abuts against the locking surface portion 96 at the base portion 111, and is attached to the caliper body 15 at an angle relative to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis.

A pair of friction pads 102 are arranged on the opposite side of the pad spring 101 from the intermediate connecting portion 25. In other words, the pad spring 101 is arranged between the intermediate connecting portion 25 and the pair of friction pads 102 and attached to the intermediate connecting portion 25.

The pad spring 101 has a pressure plate portion 118 on the disk rotation side that abuts against the disk rotation side portions of the pair of friction pads 102 from the outside in the disk radial direction, pressing them inward in the disk radial direction. The pad spring 101 has a pressure plate portion 119 on the disk rotation side that abuts against the disk rotation side portions of the pair of friction pads 102 from the outside in the disk radial direction, pressing them inward in the disk radial direction.

The pair of friction pads 102 are common parts having the same shape. The friction pad 102 has a back plate 121 that is long in the direction of disc rotation, and a lining material 122 that is attached to one surface of the back plate 121 in the thickness direction and extends in the longitudinal direction of the back plate 121. The friction pad 102 is supported by the caliper body 15 at the back plate 121, and the lining material 122 comes into contact with the disc 11 to apply a braking force to the vehicle.

The back plate 121 has a constant thickness and includes a main plate portion 130 to which a lining material 122 is attached, and a pair of extension portions 131 and 132 extending from the outer side of the disk radial direction to both sides of the disk rotation direction at both ends of the main plate portion 130 in the disk rotation direction. The main plate portion 130 has a generally rectangular shape that is long in the disk rotation direction, and the extension portions 131 and 132 extend from both ends of the main plate portion 130 in the disk rotation direction, which are both sides of the longitudinal direction of the main plate portion 130, in a direction inclined with respect to the longitudinal direction of the main plate portion 130. The longitudinal direction of the main plate portion 130 is the longitudinal direction of the back plate 121 and the longitudinal direction of the friction pad 102. Thus, the back plate 121 has a pair of extension portions 131, 132 formed on both ends of the disk rotation direction and on the outer side of the disk radial direction, which extend in a direction inclined toward the outer side of the disk radial direction with respect to the longitudinal direction of the friction pad 102. In other words, the extensions 131 and 132 extend from the longitudinal ends of the friction pad 102 in a direction inclined toward the radially outward direction of the disk with respect to the longitudinal direction. In the back plate 121, the outer shape of the main plate portion 130 has a mirror-symmetric shape, and the extensions 131 and 132 have mirror-symmetric shapes. Thus, the back plate 121 has a mirror-symmetric shape in the longitudinal direction.

One extension portion 131 extends from the radially outer side of the disk at one end of the main plate portion 130 in the disk rotation direction along the longitudinal direction of the main plate portion 130 in a direction away from the main plate portion 130, and is inclined so as to be positioned radially outward in the reference line direction as it approaches the extending tip. The other extension portion 132 extends from the radially outer side of the disk at the other end of the main plate portion 130 in the disk rotation direction along the longitudinal direction of the main plate portion 130 in a direction away from the main plate portion 130, and is inclined so as to be positioned radially outward in the reference line direction as it approaches the extending tip.

The main plate portion 130 has a planar base surface portion 141 extending perpendicular to the longitudinal direction of the main plate portion 130 on one longitudinal side where the extension portion 131 is located, and a planar base surface portion 142 extending perpendicular to the longitudinal direction of the main plate portion 130 on the other longitudinal side where the extension portion 132 is located. The main plate portion 130 has an outer surface portion 143 on the outer side in the radial direction of the disk that connects the end edges of the pair of extension portions 131, 132 on the mutually adjacent sides. The pair of extension portions 131, 132 protrude outward in the radial direction of the disk beyond the outer surface portion 143.

The base surface portions 141 and 142 are both planar and extend in the thickness direction of the back plate 121. The base surface portions 141 and 142 are parallel to each other. The base surface portion 141 is provided continuously from the extension portion 131 and extends inward in the disk radial direction from the extension portion 131 while being perpendicular to the longitudinal direction of the friction pad 102. The base surface portion 142 is provided continuously from the extension portion 132 and extends inward in the disk radial direction from the extension portion 132 while being perpendicular to the longitudinal direction of the friction pad 102.

The extension portion 131 extends from between the base surface portion 141 and the outer surface portion 143. The extension portion 131 has a generally diamond shape when the back plate 121 is viewed from the plate thickness direction. The extension portion 131 has a surface portion 151 on the inner side in the disk radial direction and on the outer side in the disk rotation direction, a surface portion 152 on the inner side in the disk radial direction and on the inner side in the disk rotation direction, and an abutment surface portion 153 on the outer side in the disk radial direction. The surfaces 151, 152 and the abutment surface portion 153 are all flat surfaces that extend in the plate thickness direction of the back plate 121 and extend along the disk axial direction.

The surface portion 151 extends from the radially outer edge of the base surface portion 141 toward the radially outer side of the disk and toward the outer side of the disk rotation direction at an angle to the longitudinal direction and the reference line direction of the friction pad 102. The surface portion 151 and the base surface portion 141 form an obtuse angle. The angle between the surface portion 151 and the base surface portion 141 is equal to the angle between the flat portion 73B of the pad support portion 32B and the torque receiving surface 71B.

The surface portion 152 extends from the edge of the outer surface portion 143 on the base surface portion 141 side in the disk rotation direction, at an angle to the longitudinal direction and the reference line direction of the friction pad 102, toward the outside in the disk radial direction and the disk rotation direction. The surface portion 152 and the outer surface portion 143 form an obtuse angle.

The abutment surface portion 153 connects the edge portion of the surface portion 151 opposite the base surface portion 141 to the edge portion of the surface portion 152 opposite the outer surface portion 143. The surface portion 151 and the abutment surface portion 153 form an acute angle, and the surface portion 152 and the abutment surface portion 153 form an obtuse angle. The abutment surface portion 153 is parallel to the longitudinal direction of the friction pad 102.

The extension portion 132 extends from between the base surface portion 142 and the outer surface portion 143. The extension portion 132 has a generally diamond shape when the back plate 121 is viewed from the plate thickness direction. The extension portion 132 has a surface portion 161 on the inner side in the disk radial direction and on the outer side in the disk rotation direction, a surface portion 162 on the inner side in the disk radial direction and on the inner side in the disk rotation direction, and an abutment surface portion 163 on the outer side in the disk radial direction. The surfaces 161, 162 and the abutment surface portion 163 are all flat surfaces that extend in the plate thickness direction of the back plate 121 and extend along the disk axial direction.

The surface portion 161 extends from the radially outer edge side of the base surface portion 142 in the radial direction of the disk outward and in the direction of disk rotation at an angle to the longitudinal direction and the reference line direction of the friction pad 102. The surface portion 161 and the base surface portion 142 form an obtuse angle. The angle between the surface portion 161 and the base surface portion 142 is equal to the angle between the flat surface portion 83B of the pad support portion 33B and the torque receiving surface 81B, and is equal to the angle between the surface portion 151 of the extension portion 131 and the base surface portion 141.

The surface portion 162 extends from the edge of the outer surface portion 143 on the base surface portion 142 side in the disk rotation direction at an angle to the longitudinal direction and the reference line direction of the friction pad 102, radially outward in the disk rotation direction and outward in the disk rotation direction. The surface portion 162 and the outer surface portion 143 form an obtuse angle.

The abutment surface portion 163 connects the edge portion of the surface portion 161 opposite the base surface portion 142 to the edge portion of the surface portion 162 opposite the outer surface portion 143. The surface portion 161 and the abutment surface portion 163 form an acute angle, and the surface portion 162 and the abutment surface portion 163 form an obtuse angle. The abutment surface portion 163 is parallel to the longitudinal direction of the friction pad 102. The abutment surface portion 163 and the abutment surface portion 153 are arranged on the same plane.

When the friction pad 102 is assembled to the inner side of the pad arrangement space 61 of the caliper body 15, the lining material 122 is positioned on the outer side relative to the back plate 121, and the extension portions 131, 132 are positioned radially outward of the disc, so that, as shown in FIG. 5, the extension portion 131 is engaged with the pad engagement portion 75B on the disc rotation side, and the extension portion 132 is engaged with the pad engagement portion 85B on the disc rotation side.

At that time, the friction pad 102 arranged on the inner side has an extension portion 132 arranged on the disc rotation side that abuts in surface contact with the pressing plate portion 118 on the disc rotation side of the pad spring 101 at the abutment surface portion 163, and is pressed radially inwardly on the disc by the pressing plate portion 118 and the pair of extending plate portions 114, 115, and abuts in surface contact with the flat portion 83B of the pad engagement portion 85B at the surface portion 161. Also, the friction pad 102 arranged on the inner side has an extension portion 131 arranged on the disc rotation side that abuts in surface contact with the pressing plate portion 119 on the disc rotation side of the pad spring 101 at the abutment surface portion 153, and is pressed radially inwardly on the disc by the pressing plate portion 119 and the pair of extending plate portions 116, 117, and abuts in surface contact with the flat portion 73B of the pad engagement portion 75B at the surface portion 151.

When the friction pad 102 is assembled to the outer side of the pad arrangement space 61 of the caliper body 15, the lining material 122 is positioned on the inner side relative to the back plate 121, and the extension portions 131, 132 are positioned radially outward of the disc, so that the extension portion 131 is engaged with the pad engagement portion 75A of the pad support portion 32A on the disc rotation exit side shown in Figure 1, and the extension portion 132 is engaged with the pad engagement portion 85A of the pad support portion 33A on the disc rotation entry side.

At that time, the friction pad 102 arranged on the outer side has an extension 131 arranged on the disc rotation side that abuts in surface contact with the pressing plate 118 on the disc rotation side of the pad spring 101 at the abutment surface 153, and is pressed radially inwardly on the disc by the pressing plate 118 and the pair of extending plates 114, 115, and abuts in surface contact with the flat surface 73A of the pad locking portion 75A at the surface 151. Also, the friction pad 102 arranged on the outer side has an extension 132 arranged on the disc rotation side that abuts in surface contact with the pressing plate 119 on the disc rotation side of the pad spring 101 at the abutment surface 163, and is pressed radially inwardly on the disc by the pressing plate 119 and the pair of extending plates 116, 117, and abuts in surface contact with the flat surface 83A of the pad locking portion 85A at the surface 161.

5, the locking surface portion 96 of the caliper body 15 is inclined so that the disc rotation side is located radially outward of the disc in the reference line direction than the disc rotation side. Therefore, the pad spring 101 is inclined so that the disc rotation side is located radially outward of the disc in the reference line direction than the disc rotation side, similar to the locking surface portion 96, by the substrate portion 111 being in surface contact with the locking surface portion 96 of the caliper body 15. Therefore, the substrate portion 111 is closer to the abutment surfaces 153, 163 of the pair of friction pads 102 in the reference line direction on the disc rotation side than on the disc rotation side. For this reason, in the pad spring 101, the amount of elastic deformation of the extension plate parts 116, 117 between the base plate part 111 and the pressing plate part 119 on the disk rotation side abutting against the abutment surface parts 153, 163 on the disk rotation side of the pair of friction pads 102 is greater than the amount of elastic deformation of the extension plate parts 114, 115 between the base plate part 111 and the pressing plate part 118 on the disk rotation side abutting against the abutment surface parts 153, 163 on the disk rotation side of the pair of friction pads 102. Therefore, the angle between the extension plate parts 116, 117 and the pressing plate part 119 is greater than the angle between the extension plate parts 114, 115 and the pressing plate part 118, and is closer to 180 degrees.

As a result, the load with which the pad spring 101 presses the pair of friction pads 102 radially inward on the disk is greater for the load Fin on the disk rotation side shown in Figure 7A than for the load Fout on the disk rotation side shown in Figure 7B.

Here, as shown in Figure 7A, the surface portion 151 of the extension portion 131 on the disk entry side of the inner friction pad 102 and the flat surface portion 73B of the pad engagement portion 75B, the angle between the surface portions 151, 161 of the extension portions 131, 132 on the disk entry side of the pair of friction pads 102 and the flat surfaces 73B, 83A of the pad engagement portions 75B, 85A and the disk radial reference line is θ. Then, the load Fin is divided into a component force Fin·sinθ in a direction perpendicular to the surface portions 151, 161 and the flat surfaces 73B, 83A on the disk entry side, and a component force Fin·cosθ in a direction along the surface portions 151, 161 and the flat surfaces 73B, 83A on the disk entry side.

As shown in Fig. 7B, the angle between the surface 161 of the extending portion 132 on the disk rotation side of the inner friction pad 102 and the flat surface 83B of the pad engagement portion 85B and the surface 151, 161 of the extending portions 131, 132 on the disk rotation side of the pair of friction pads 102 and the flat surface 73A, 83B of the pad engagement portion 75A, 85B is also θ. Then, the load Fout is divided into a component force Fout·sinθ in a direction perpendicular to the surface 151, 161 and the flat surface 73A, 83B on the disk rotation side, and a component force Fout·cosθ in a direction along the surface 151, 161 and the flat surface 73A, 83B on the disk rotation side.

The friction coefficient μin between the surface parts 151, 161 of the extension parts 131, 132 on the disk rotation side of the pair of friction pads 102 and the flat parts 73B, 83A of the pad engagement parts 75B, 85A is approximately equal to the friction coefficient μout between the surface parts 151, 161 of the extension parts 131, 132 on the disk rotation side of the pair of friction pads 102 and the flat parts 73A, 83B of the pad engagement parts 75A, 85B. Therefore, a resultant force Ftol of the component forces Fout·cosθ and Fin·cosθ as shown in FIG. 7C is generated from the pad spring 101 to the pair of friction pads 102. This resultant force Ftol is directed inward in the disk radial direction, and since the load Fin on the disk rotation side is greater than the load Fout on the disk rotation side, it is directed toward the disk rotation side in the disk rotation direction.

As shown in FIG. 5, when the friction pad 102 arranged on the inner side receives only the biasing force of the pad spring 101, the resultant force Ftol of the pad spring 101 causes the base surface portion 142 of the main plate portion 130 to abut in surface contact with the torque receiving surface 81B on the inner side and on the disc rotation side facing it, the surface portion 161 of the extension portion 132 to abut in surface contact with the flat surface portion 83B on the inner side and on the disc rotation side facing it, and the surface portion 151 of the extension portion 131 to abut in surface contact with the flat surface portion 73B on the inner side and on the disc rotation side facing it.

When the caliper body 15 is viewed from the disk axis direction, the angle between the locking surface 96 and a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis is set based on the magnitude of the inclination of the plane portions 73B, 83B of the pad locking portions 75B, 85B, in other words, the magnitude of the inclination of the plane portions 151, 161 of the extension portions 131, 132. In other words, it is assumed that the component force Fout is constant and the component force Fin is constant and larger than the component force Fout. In this case, if the angle θ, which is the magnitude of the inclination of the plane portions 73B, 83B and the plane portions 151, 161, is reduced, the component of the resultant force Ftol in the disk rotation direction becomes smaller. Therefore, when the angle θ is reduced, it is necessary to increase the difference between the component force Fout and the component force Fin in order to make the component of the resultant force Ftol in the disk rotation direction a sufficient predetermined value or more. For this reason, the angle between the locking surface 96 and a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis is increased. Conversely, when the angle θ is increased, even if the difference between the force components Fout and Fin is reduced, the component of the resultant force Ftol in the disk rotation direction can be made to be equal to or greater than a sufficient predetermined value. For this reason, the angle between the locking surface 96 and a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis is reduced.

When the pair of friction pads 102 and pad springs 101 are assembled, the caliper body 15 has a flat surface 73B in which the inner pad engagement portion 75B extends along the extension direction of the extension portion 131 of the inner friction pad 102. The inner friction pad 102 has the extension portion 131 in surface contact with the flat surface 73B at the surface 151, and is engaged with the inner pad engagement portion 75B. In this state, the caliper body 15 has a flat surface 83B in which the inner pad engagement portion 85B extends along the extension direction of the extension portion 132 of the inner friction pad 102. The inner friction pad 102 has the extension portion 132 in surface contact with the flat surface 83B at the surface 161, and is engaged with the inner pad engagement portion 85B.

In addition, in this state, the caliper body 15 has an inner torque receiving portion 86B having a torque receiving surface 81B along the extending direction of the base surface portion 142 of the inner friction pad 102. The inner torque receiving portion 76B has a torque receiving surface 71B along the extending direction of the base surface portion 141 of the inner friction pad 102. In addition, in this state, the inner friction pad 102 has the base surface portion 142 of the main plate portion 130 abutting against the torque receiving surface 81B of the torque receiving portion 86B, and the base surface portion 141 of the main plate portion 130 facing the torque receiving surface 71B of the torque receiving portion 76B with a slight gap. Furthermore, in this state, the extending portions 131, 132 of the inner friction pad 102 are arranged radially outward from the outermost periphery of the disk 11.

When the friction pad 102 arranged on the outer side shown in Figures 1 and 4 is subjected to only the biasing force of the pad spring 101, the resultant force Ftol of the pad spring 101 causes the base surface portion 141 of the main plate portion 130 to abut in surface contact with the torque receiving surface 71A on the opposing outer side and disc rotation side, the surface portion 151 of the extension portion 131 to abut in surface contact with the flat surface portion 73A on the opposing outer side and disc rotation side, and the surface portion 161 of the extension portion 132 to abut in surface contact with the flat surface portion 83A on the opposing outer side and disc rotation side.

When the caliper body 15 is viewed from the disk axis direction, the angle between the locking surface 96 and a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis is set based on the magnitude of the inclination of the plane portions 73A, 83A of the pad locking portions 75A, 85A, in other words, the magnitude of the inclination of the plane portions 151, 161 of the extension portions 131, 132. That is, it is assumed that the component force Fout is constant and the component force Fin is constant and larger than the component force Fout. In this case, if the angle θ, which is the magnitude of the inclination of the plane portions 73A, 83A and the plane portions 151, 161, is reduced, the component of the resultant force Ftol in the disk rotation direction becomes smaller. Therefore, when the angle θ is reduced, it is necessary to increase the difference between the component force Fout and the component force Fin in order to make the component of the resultant force Ftol in the disk rotation direction a sufficient predetermined value or more. For this reason, the angle between the locking surface 96 and a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis is increased. Conversely, when the angle θ is increased, even if the difference between the force components Fout and Fin is reduced, the component of the resultant force Ftol in the disk rotation direction can be made to be equal to or greater than a sufficient predetermined value. For this reason, the angle between the locking surface 96 and a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disk axis is reduced.

When the pair of friction pads 102 and pad springs 101 are assembled, the caliper body 15 has a flat surface 73A in which the outer pad locking portion 75A extends along the extension direction of the extension portion 131 of the outer friction pad 102. The outer friction pad 102 has the extension portion 131 in surface contact with the flat surface 73A at the surface 151, and is locked to the outer pad locking portion 75A. In this state, the caliper body 15 has a flat surface 83A in which the outer pad locking portion 85A extends along the extension direction of the extension portion 132 of the outer friction pad 102. The outer friction pad 102 has the extension portion 132 in surface contact with the flat surface 83A at the surface 161, and is locked to the outer pad locking portion 85A.

In this state, the outer torque receiving portion 76A of the caliper body 15 has a torque receiving surface 71A along the extending direction of the base surface portion 141 of the outer friction pad 102, and the outer torque receiving portion 86A has a torque receiving surface 81A along the extending direction of the base surface portion 142 of the outer friction pad 102. In this state, the base surface portion 141 of the main plate portion 130 of the outer friction pad 102 abuts against the torque receiving surface 71A of the torque receiving portion 76A, and the base surface portion 142 of the main plate portion 130 faces the torque receiving surface 81A of the torque receiving portion 86A with a slight gap. In this state, the extension portions 131 and 132 of the outer friction pad 102 are arranged radially outward from the outermost circumference of the disk 11. In this manner, a pair of friction pads 102 are engaged with one caliper body 15.

The inner friction pad 102 shown in Figure 5 is supported by the inner pad engagement portions 75B, 85B of the caliper body 15 and moves in the disk axial direction, and at that time, the pad engagement portions 75B, 85B engage the extension portions 131, 132 of the inner friction pad 102 with the V-shaped planar portions 73B, 83B on both sides in the disk rotation direction.

The outer friction pad 102 shown in Figure 1 is supported by the outer pad engagement portions 75A, 85A of the caliper body 15 and moves in the disk axial direction, during which the pad engagement portions 75A, 85A engage the extension portions 131, 132 of the outer friction pad 102 with the V-shaped planar portions 73A, 83A on both sides in the disk rotation direction.

Therefore, the caliper 12 does not have pad pins that support the pair of friction pads 102, but supports the pair of friction pads 102 directly on the caliper body 15, which is a so-called pad pinless structure.

As described above, even if the pad spring 101 has a symmetrical shape, the locking surface portion 96 of the caliper body 15 is arranged parallel to the disk axis, and is perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and inclined to a plane parallel to the disk axis, so that the load Fin on the disk rotation side and the load Fout on the disk rotation side by the pad spring 101 can be set to be larger or smaller. As a result, even if the pad spring 101 has a symmetrical shape, a load toward the disk rotation side can be applied to the pair of friction pads 102. Therefore, the pair of friction pads 102 can be brought closer to the disk rotation side and kept in contact with the torque receiving portions 76A, 86B of the caliper body 15. Therefore, the clunking sound generated when the friction pad 102 moves to the disk rotation side and collides with the torque receiving portions 76A, 86B of the caliper body 15 during braking while the vehicle is traveling forward can be suppressed.

In the above-described disc brake 10, when brake fluid is introduced into the cylinder bores 38, 39, 58, and 59 of the cylinder parts 21 and 22 shown in Figs. 2 and 3 through the supply and discharge port 41 shown in Fig. 1, the four pistons 16 shown in Fig. 4 move toward the disc 11 due to the hydraulic pressure of the brake fluid. Then, the two pistons 16 provided in the outer cylinder part 21 press the outer friction pad 102 provided between the cylinder part 21 and the disc 11, and press the lining material 122 against the disc 11. In addition, the two pistons 16 provided in the inner cylinder part 22 press the inner friction pad 102 provided between the cylinder part 22 and the disc 11, and press the lining material 122 against the disc 11. This generates a braking force on the vehicle. In other words, the outer piston 16 presses the outer friction pad 102 against the disk 11 , and the inner piston 16 presses the inner friction pad 102 against the disk 11 .

At this time, the pair of friction pads 102 are engaged with the caliper body 15 so that their movement in the radially inward direction of the disk and in the direction of disk rotation is restricted by the pad support portions 32A, 33A, 32B, 33B, and they move in the axial direction of the disk.

During movement in the disk axial direction, the inner friction pad 102 shown in FIG. 5 moves while being supported by the pad engagement parts 75B, 85B of the inner pad support parts 32B, 33B at the extension parts 131, 132. During this movement, the extension part 131 slides on the flat surface part 73B of the pad engagement part 75B at the surface part 151, and the extension part 132 slides on the flat surface part 83B of the pad engagement part 85B at the surface part 161. During movement in the disk axial direction, the outer friction pad 102 shown in FIG. 1 moves while being engaged by the pad engagement parts 75A, 85A of the outer pad support parts 32A, 33A at the extension parts 131, 132. At that time, the surface portion 151 of the extension portion 131 slides on the flat surface portion 73A of the pad locking portion 75A, and the surface portion 161 of the extension portion 132 slides on the flat surface portion 83A of the pad locking portion 85A. In this manner, the caliper body 15 including the pad locking portions 75A, 75B, 85A, and 85B locks the friction pad 102 so as to be movable in the disk axial direction.

When the vehicle is braking forward, the pair of friction pads 102 move to the disc rotation side, contacting the disc 11 at the lining material 122. Then, as shown in FIG. 4, the outer friction pad 102 is pressed in surface contact with the torque receiving surface 71A of the torque receiving portion 76A on the disc rotation side at the base surface portion 141 of the back plate 121, and the inner friction pad 102 is pressed in surface contact with the torque receiving surface 81B of the torque receiving portion 86B on the disc rotation side at the base surface portion 142 of the back plate 121. As a result, the caliper body 15 receives the braking torque from the pair of friction pads 102 mainly at the torque receiving portions 76A and 86B.

When the vehicle is braking in reverse, the pair of friction pads 102 move toward the torque receiving portions 76B, 86A, contacting the disk 11 at the lining material 122. Then, the outer friction pad 102 is pressed against the torque receiving surface 81A of the torque receiving portion 86A at the base surface portion 142 of the back plate 121 in surface contact, and the inner friction pad 102 is pressed against the torque receiving surface 71B of the torque receiving portion 76B at the base surface portion 141 of the back plate 121 in surface contact. As a result, the caliper body 15 receives the braking torque from the pair of friction pads 102 mainly at the torque receiving portions 76B, 86A.

The above-mentioned Patent Document 1 discloses a disc brake having an extension portion that extends in a direction inclined with respect to the longitudinal direction of the friction pad at the end side of the disc rotation direction of the back plate of the friction pad, and a pad support portion having a flat portion that extends along the extension direction of the extension portion is provided on the locking member, and the extension portion of the friction pad is locked to the pad support portion. In the disc brake, in order to suppress the abnormal noise called the clunk sound that occurs during braking, the friction pad is abutted against the torque receiving portion on the disc rotation side of the locking member by the biasing force of the pad spring. That is, the clunk sound is generated when the friction pad moves to the disc rotation side and collides with the torque receiving portion of the locking member when braking while the vehicle is traveling forward. Therefore, even when not braking, the friction pad is biased to the disc rotation side by the biasing force of the pad spring and pressed against the torque receiving portion of the locking member to suppress collisions and suppress the clunk sound. Since it is necessary to bias the friction pad in the disc rotation direction in this way, the shape of the pad spring cannot be simplified, which reduces productivity.

In the disc brake 10 of this embodiment, a pair of friction pads 102 are provided with extension portions 131, 132 extending from the longitudinal ends of the friction pads 102 in a direction inclined toward the radially outer side of the disc 11 relative to the longitudinal direction, a base surface portion 141 extending from the extension portion 131 toward the radially inner side of the disc 11 while being perpendicular to the longitudinal direction of the friction pad 102, and a base surface portion 142 extending from the extension portion 132 toward the radially inner side of the disc 11 while being perpendicular to the longitudinal direction of the friction pad 102. The disc brake 10 includes a caliper body 15 having a flat surface portion 73A on the disc rotation side and outer side along the extending direction of the extending portion 131, a pad engagement portion 75A to which the extending portion 131 is engaged, and a torque receiving portion 76A extending inward in the disc radial direction from the pad engagement portion 75A, having a torque receiving surface 71A along the extending direction of the base surface portion 141, and against which the base surface portion 141 abuts. The caliper body 15 also has a flat surface portion 83B on the disc rotation side and inner side along the extending direction of the extending portion 132, a pad engagement portion 85B to which the extending portion 132 is engaged, and a torque receiving portion 86B extending inward in the disc radial direction from the pad engagement portion 85B, having a torque receiving surface 81B along the extending direction of the base surface portion 142, and against which the base surface portion 142 abuts. The caliper body 15 also includes, on the disk rotation-in side and outer side, a flat surface portion 83A along the extending direction of the extending portion 132, a pad locking portion 85A to which the extending portion 132 is locked, and a torque receiving portion 86A extending inward in the disk radial direction from the pad locking portion 85A, having a torque receiving surface 81A along the extending direction of the base surface portion 142, and with which the base surface portion 142 abuts. The caliper body 15 also includes, on the disk rotation-in side and inner side, a flat surface portion 73B along the extending direction of the extending portion 131, a pad locking portion 75B to which the extending portion 131 is locked, and a torque receiving portion 76B extending inward in the disk radial direction from the pad locking portion 75B, having a torque receiving surface 71B along the extending direction of the base surface portion 141, and with which the base surface portion 141 abuts.

In the disc brake 10 having such a structure, the pad spring 101 is attached at an angle to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, and 81B when viewed from the axial direction of the disc 11. By attaching the pad spring 101 to the caliper body 15 at an angle in this manner, it is possible for the pad spring 101 to generate a biasing force in the disc rotation direction against the pair of friction pads 102. This makes it possible to simplify the shape of the pad spring 101 and suppress a decrease in productivity.

In addition, in the disc brake 10 of this embodiment, the caliper body 15 is provided with a locking surface portion 96 that is inclined at an acute angle with respect to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, and 81B when viewed from the axial direction of the disc 11. The pad spring 101 is attached at an incline with respect to the torque receiving surfaces 71A, 71B, 81A, and 81B by abutting against the locking surface portion 96. Therefore, the pad spring 101 can be easily and appropriately inclined and attached to the caliper body 15. Therefore, the pad spring 101 can be easily attached to the caliper body 15. Therefore, the decrease in productivity can be further suppressed. In addition, the inclination of the locking surface portion 96 can be formed by machining. Therefore, the casting that is the material of the caliper body 15 can be shared between the right and left mounting in the vehicle. Therefore, it is possible to reduce the number of types of cast parts and the management costs and mold costs of the cast parts.

In addition, in the disc brake 10 of this embodiment, the pad spring 101 is substantially symmetrical when viewed from the axial direction of the disc 11, so that the pad spring 101 can be attached to the caliper body 15 without worrying about the direction of disc rotation. Therefore, since the pad spring 101 can be easily attached to the caliper body 15, the decrease in productivity can be further suppressed. That is, in order to bias the friction pad in the disc rotation direction by the shape of the pad spring itself, the pad spring needs to be asymmetrical. In this way, when the pad spring is asymmetrical, in order to clarify the assembly direction, it was necessary to engrave an arrow or letter indicating the assembly direction on the pad spring, or to provide a shape for preventing the pad spring from being assembled incorrectly on the caliper body side by machining or casting. In addition, in the assembly process, the pad spring needs to be assembled to the caliper body while paying attention to the assembly direction, which requires a lot of work, and after assembly, visual inspection needs to be performed multiple times to check for the presence or absence of assembly errors. All of these lead to a decrease in productivity. In the disc brake 10 of this embodiment, the pad spring 101 is substantially symmetrical when viewed from the axial direction of the disc 11, so there is no need to mark the pad spring 101 to indicate the assembly direction or to provide a shape on the caliper body 15 to prevent the pad spring 101 from being assembled incorrectly. In addition, the pad spring 101 can be made common for both right and left mounting on the vehicle, which reduces the number of types of parts and the management cost and press die cost. This reduces the manufacturing cost of the pad spring 101 and the caliper body 15. In addition, the pad spring 101 can be assembled to the caliper body 15 without paying attention to the assembly direction, and visual inspection to check whether the pad spring 101 is assembled incorrectly is also not required. This further suppresses a decrease in productivity.

In addition, in the disc brake 10 of this embodiment, the acute angle that the locking surface portion 96 makes with respect to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, and 81B is set based on the magnitude of the inclination of the extension portions 131 and 132. Therefore, the pad spring 101 can bias the pair of friction pads 102 with an appropriate biasing force in the disc rotation direction.

In addition, in the disc brake 10 of this embodiment, since the torque receiving portions 76A, 86B on the rotation side of the disc 11 have the above-mentioned structure, the pad spring 101 can effectively abut the pair of friction pads 102 against the torque receiving portions 76A, 86B on the rotation side of the disc. Therefore, the generation of abnormal noise during braking can be effectively suppressed.

In addition, in the disc brake 10 of this embodiment, the friction pad 102 is common between the inner side and the outer side, which reduces the number of part types and reduces part management costs.

Here, in the disc brake 10 of this embodiment, the locking surface portion 96, which serves as the reference surface for mounting the pad spring 101 in the caliper body 15, is inclined with respect to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disc axis, so that the pad spring 101, which is mounted using this plane as the mounting reference, is inclined in the same manner as this plane. However, this is not limited to this, and various other measures can be adopted as long as the pad spring 101 can be mounted at an incline with respect to a plane perpendicular to the torque receiving surfaces 71A, 71B, 81A, 81B and parallel to the disc axis.

The first aspect of the present embodiment described above includes a friction pad (e.g., friction pad 102), a body member (e.g., caliper body 15) that engages the friction pad so as to be movable in the axial direction of a disk (e.g., disk 11), and a pad spring (e.g., pad spring 101) that presses the friction pad against the radially inward direction of the disk, and the friction pad has an extension portion (e.g., extension portions 131, 132) that extends from a longitudinal end of the friction pad in a direction inclined toward the radially outward direction of the disk with respect to the longitudinal direction, and a base surface portion (e.g., base surface portions 141, 142) that extends from the extension portion toward the radially inward direction of the disk while being perpendicular to the longitudinal direction. , the body member has a first flat surface portion (e.g., flat surface portions 73A, 73B, 83A, 83B) along the extending direction of the extending portion, a pad engaging portion (e.g., pad engaging portions 75A, 75B, 85A, 85B) to which the extending portion is engaged, and a second flat surface portion (e.g., torque receiving surfaces 71A, 71B, 81A, 81B) extending radially inward from the pad engaging portion and along the extending direction of the base surface portion, the torque receiving portion (e.g., torque receiving portions 76A, 76B, 86A, 86B) to which the base surface portion abuts, the pad spring being attached at an angle with respect to a plane perpendicular to the second flat surface portion as viewed from the axial direction of the disk. This makes it possible to suppress a decrease in productivity.

In addition, the second aspect of this embodiment is the first aspect described above, wherein the body member is provided with a locking surface portion (e.g., locking surface portion 96) that is inclined at an acute angle with respect to a plane perpendicular to the second planar portion when viewed from the axial direction of the disc, and the pad spring is attached at an incline with respect to the plane perpendicular to the second planar portion by abutting against the locking surface portion.

In addition, the third aspect of this embodiment is the second aspect described above, in which the pad spring is approximately symmetrical when viewed from the axial direction of the disc.

Furthermore, a fourth aspect of this embodiment is the second aspect described above, in which the magnitude of the acute angle is set based on the magnitude of the inclination of the extension portion.

In addition, the fifth aspect of this embodiment is the first aspect described above, in which the torque receiving portion is on the rotating side of the disk.

A sixth aspect of this embodiment is a friction pad (e.g., friction pad 102) having an extension portion (e.g., extension portions 131, 132) extending from a longitudinal end of the friction pad in a direction inclined toward the radial outside of the disk (e.g., disk 11) with respect to the longitudinal direction, and a base surface portion (e.g., base surface portions 141, 142) extending from the extension portion toward the radial inside of the disk while being perpendicular to the longitudinal direction, and a body member (e.g., caliper body 15) that engages the friction pad movably in the axial direction of the disk, the body member having a first flat surface portion (e.g., flat surface portions 73A, 73B, 83A, 83B) aligned with the extension direction of the extension portion. the body member having a pad engaging portion (e.g., pad engaging portion 75A, 75B, 85A, 85B) to which the extension portion is engaged, and a second flat portion (e.g., torque receiving surface 71A, 71B, 81A, 81B) extending radially inward of the disc and along the extension direction of the base surface portion, and a torque receiving portion (e.g., torque receiving portion 76A, 76B, 86A, 86B) with which the base surface portion abuts; and a pad spring (e.g., pad spring 101) attached at an angle with respect to a plane perpendicular to the second flat portion when viewed in the axial direction of the disc, and pressing the friction pad radially inward of the disc.

The disc brake of the present invention makes it possible to suppress declines in productivity. Therefore, it has great industrial applicability.

10 Disc brake 11 Disc 15 Caliper body (body member)
71A, 71B, 81A, 81B Torque receiving surface (second flat portion)
73A, 73B, 83A, 83B Planar portion (first planar portion)
75A, 75B, 85A, 85B Pad locking portion 76A, 76B, 86A, 86B Torque receiving portion 96 Locking surface portion 101 Pad spring 102 Friction pad 131, 132 Extension portion 141, 142 Base surface portion

Claims (4)

Friction pads;
a body member that holds the friction pad so as to be movable in the axial direction of the disk;
a pad spring that presses the friction pad against the radially inner side of the disk;
Equipped with
The friction pad is
an extension portion extending from an end portion of the friction pad in a longitudinal direction in a direction inclined toward a radially outer side of the disk with respect to the longitudinal direction;
a base surface portion extending from the extension portion toward a radially inner side of the disk while being perpendicular to the longitudinal direction;
Equipped with
The body member includes:
a pad engaging portion having a first flat portion aligned along an extending direction of the extending portion and adapted to engage with the extending portion;
a torque receiving portion that is provided so as to extend from the pad engaging portion toward a radially inward direction of the disk, the torque receiving portion having a second flat portion along an extending direction of the base surface portion, the second flat portion being in contact with the base surface portion;
a locking surface portion provided on an inner portion in the disk radial direction of the intermediate connection portion disposed so as to straddle the disk in the disk axial direction on the outer side of the disk in the disk radial direction, the locking surface portion facing inward in the disk radial direction, the locking surface portion forming an acute angle with a portion extending from a boundary line between the locking surface portion and an engagement surface on the disk outlet side provided on the wall surface of the intermediate connection portion toward the disk inlet side, the plane perpendicular to the second flat portion as viewed in the disk axial direction, the locking surface portion
Equipped with
the pad spring is attached at an incline with respect to a plane perpendicular to the second planar portion when viewed in the axial direction of the disk by contacting the locking surface portion ;
Disc brake. The pad spring is mirror symmetrical in the left-right direction when viewed from the axial direction of the disk.
2. The disc brake of claim 1 . The torque receiving portion is on the rotation side of the disk.
2. The disc brake of claim 1. A friction pad comprising:
an extension portion extending from an end portion of the friction pad in a longitudinal direction in a direction inclined toward a radially outer side of the disk with respect to the longitudinal direction;
a base surface portion extending from the extension portion toward a radially inner side of the disk while being perpendicular to the longitudinal direction;
The friction pad having
A body member that engages the friction pad so as to be movable in the axial direction of the disk,
a pad engaging portion having a first flat portion aligned along an extending direction of the extending portion and to which the extending portion is engaged;
a torque receiving portion that is provided so as to extend from the pad engaging portion toward a radially inner side of the disk, the torque receiving portion having a second flat portion along an extending direction of the base surface portion, the second flat portion being in contact with the base surface portion;
a locking surface portion provided on an inner portion in the disk radial direction of the intermediate connecting portion disposed on an outer side in the disk radial direction so as to straddle the disk in the disk axial direction, the locking surface portion facing inward in the disk radial direction;
a body member having
a pad spring that is attached such that an angle formed by a plane perpendicular to the second flat portion and a portion extending from a boundary line between the locking surface portion and an engagement surface on the disk rotation outlet side provided on the wall surface of the intermediate connecting portion toward the disk rotation inward side is inclined when viewed from the axial direction of the disk, and that presses the friction pad against the radial inside of the disk;
Equipped with a disc brake.

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