JPS6344978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake, and more particularly to a pad spring interposed in a sliding portion between a torque member and a pair of brake pads.

Conventional disc brakes include, for example, one known from Japanese Utility Model Application No. 56-106246 and those shown in FIGS. 1 to 3. That is,
1 in Fig. 1 is a torque member, and this torque member 1 straddles a disk that rotates together with the wheel.
It also consists of two arm parts 2 provided at appropriate intervals in the rotational direction of the disk, and a trunk 3 continuous to both arm parts 2 on one side of the disc, which is screwed into a screw hole 3a provided in the trunk 3. The torque member 1 is fixed to the vehicle body side by the bolt. Each arm 2 of the torque member 1 is provided with a hole 2a extending parallel to the axial direction of the disk.
A shows a slide pin 5 fixed to the caliper 4.
is slidably inserted. Similarly to the arm 2 of the torque member 1, the arm 4b of the caliper 4 is continuous from the base 4a so as to straddle the disk, and on the inside of this arm 4b are an outer pad (not shown) and an inner pad (not shown), which are brake pads. 7 is arranged.

In addition, the caliper 4 of both arm portions 2 of the torque member 1
A support surface 8 is provided on the side facing the arm portion 4b, and the brake pad 7 is slidably supported on the torque member 1 via a pad spring 9 placed on the support surface 8. ing. As shown in FIG. 2, the pad spring 9 includes a fixing piece 10 that engages and fixes the pad spring 9 to the torque member 1, and ears 7a provided on both sides of the brake pad 7 to connect the torque member 1. A pressing piece 11 that presses the side, a connecting piece 12 that is integrally formed continuously with the fixed piece 10 and the pressing piece 11 and applies a spring force to the pressing piece 11 due to its rigidity, and a brake pad that is continuous with the fixed piece 10. Front piece 1 facing the side of 7
7, these fixing pieces 10, pressing pieces 11,
The connecting piece 12 and the front piece 17 are continuously formed integrally.

The fixed piece 10 includes a floor portion 10a placed on the support surface 8, a standing plate portion 10b that stands up continuously from the floor portion 10a, and a part of the inside of this standing plate portion 10b as the floor portion 10a. It consists of a stopper 10c bent upward on the opposite side. Front piece 17
is bent downward integrally and continuously with the floor section 10a, and a common section is provided at the part where the upright section 10b, the floor section 10a, and the front piece 17 are continuous to avoid contact with the disk. A notch 13 is provided. Then, the ear portion 7a of the brake pad 7 is placed on the upper surface of the floor portion 10a, and the ear portion 7a is placed on the upper surface of the floor portion 10a.
A small upwardly curved tip 11a at the lower end of the pressing piece 11 commonly abuts on the upper surface, and the front piece 1
The front side of the brake pad 7 faces the front side of the brake pad 7.

The connecting piece 12 is continuous in a U-shape above the fixed piece 10, that is, in a direction that intersects with the advance and retreat direction of the brake pad 7, and outward in the radial direction of the disk, and is fixed to one of the connecting pieces 12. The piece 10 is continuous, and the pressing piece 11 is continuous on the other side. Therefore, the rigidity of the connecting piece 12 provides the spring force of the pressing piece 11 that presses the brake pad 7. Therefore, when the brake pad 7 receives an excitation force, the excitation force acts in a direction intersecting the width S direction of the connecting piece 12, and the stress acting in this direction causes the brake pad 7 to move in the disk radial direction. Outward movement is restricted. The entire pad spring 9 is made of a corrosion-resistant material such as stainless steel, and presses the brake pad 7 with an appropriate pressing force while preventing corrosion of the sliding part. This ensures smooth sliding of the brake pad 7 against the brake pad 7 and reduces brake noise.

However, in the pad spring of such a conventional disc brake, it is formed continuously and integrally from a single steel plate, and the boundary line that distinguishes the fixed piece 10 and the front piece 17 is It is formed by bending. In normal bending, the radius of curvature inside the bent portion cannot be made zero, and generally a curved portion a with a radius of about 0.5 mm is formed. Therefore, as shown in an enlarged view in FIG. 3, if the support surface 8 is set avoiding the curved portion a, the depth dimension of the portion where the pad spring 9 contacts the support surface 8 will be A.
Therefore, there is a problem that not only is there a wasteful gap B that does not contribute to supporting the brake pad 7, but also that the amount of support for the brake pad 7 is small.

This invention was made by focusing on such conventional problems, and includes a torque member fixed to the vehicle body side, and a disk slidably supported by the torque member and rotating together with the wheel. a pair of brake pads that pinch the brake pads; a fixed piece that is interposed between the sliding part of the brake pads and the torque member and that engages with the torque member for positioning; It has a pressing piece that is integrally formed and presses the brake pad toward the torque member, and a pair of front pieces that are integrally formed continuously in the direction of the center of rotation of the disk on the fixed piece and individually face the sides of the brake pad. In a disc brake equipped with a pad spring, along each inner surface of the torque member that is continuous from a pair of brake pad support surfaces provided at positions sandwiching the disc and facing each other with the disc in between, By bending two side pieces integral with the fixed piece of the pad spring and arranging them separately, and making the pair of front pieces continuous with each of the side pieces to form the pair of front pieces individually bent, the above-mentioned It aims to solve problems.

The present invention will be explained below based on the drawings.

FIGS. 4 to 10 are diagrams showing an embodiment of the present invention.

First, to explain the configuration, 1 shown in FIGS. 4 and 5 is a torque member, and this torque member 1 straddles a disk (not shown) that is fixed to a wheel and rotates together with the wheel. Two arm parts 2 provided at appropriate intervals in the rotation direction
and a trunk 3 that connects to both arm portions 2 on one side of the disk, and a bolt (not shown) screwed into a screw hole 3a provided in the trunk 3 allows the torque member 1 to be attached to the vehicle body side such as a knuckle. is fixed to the member. Each arm 2 of the torque member 1 is provided with a hole 2a extending parallel to the axial direction of the disk, and a slide pin 5 is inserted into the hole 2a on the right side in FIG. 4 via a rubber sleeve 14. It is inserted in a slidable manner, and the hole on the left side (not shown) has a
A slide pin is slidably inserted directly. Both slide pins 5 are each fixed to the caliper 4 by a bolt 15 screwed into one end in the axial direction. 16 is boots.

The caliper 4 includes a base portion 4a that communicates with the torque member 1 via a slide pin 5, and a base portion 4a that communicates with the torque member 1 via a slide pin 5.
The base part 4a is provided with a cylinder (not shown) that opens in the direction in which the arm part 4b extends, and the arm part 4b is provided with a cylinder (not shown) that opens in the direction in which the arm part 4b extends. An outer pad 6 and an inner pad 7, which are brake pads, are provided. Although not shown, a piston is loosely fitted into the cylinder, and a seal 30 attached to the cylinder side is in sliding contact with the outer peripheral surface of the piston.

Further, a groove 2b facing a part of the outer peripheral edge of the disk is provided on the inner side in the disk radial direction of both arm portions 2 of the torque member 1, and a caliper 4 of both arm portions 2 is provided.
A support surface 8 for slidably supporting the outer pad 6 and the inner pad 7 is provided on the side facing the arm portion 4b. The support surface 8 is formed parallel to the rotation axis of the disk and perpendicular to the radial direction of the disk,
A pad spring 19 is placed on the support surface 8, and the pair of brake pads 6, 7 are slidably supported by the torque member 1 via the pad spring 19.

The pad spring 19 is shown in FIGS. 6 to 10.
As shown in the figure, the support surface 8 of the torque member 1
A fixing piece 20 is placed on the brake pad 6, and engages with the groove 2b of the arm portion 2 of the torque member 1 to position the pad spring 19.
The brake pads 6 and 7 are connected to the torque member 1 by commonly contacting the upper surfaces of the ears 6a and 7a provided on both sides of the torque member 1.
A pressing piece 21 that presses toward the side, a connecting piece 22 that is continuously formed integrally with the fixed piece 20 and the pressing piece 21 and applies a spring force to the pressing piece 21 due to its rigidity, and a connecting piece 22 that is continuously and integrally formed with the fixed piece 20. and a side piece 28 which is formed integrally with the side piece 28 and is bent downward on the disc side of the brake pads 6 and 7 in the advancing and retracting direction of the support surface 8.
It consists of a front piece 27 located on the brake pad side of the lower wall 2c that expands downward from the front side of the support surface 8 by bending laterally on the disk side of the lower wall 2c.
These are constructed from a single sheet of corrosion-resistant material such as stainless steel or rust-free spring steel. And fixed piece 2
One side of the connecting piece 22 is continuous with the upper center part of the 0, and the other side of the connecting piece 22 is connected to the pressing piece 21
Continuous to the central part of. The middle part of the connecting piece 22 is bent 180 degrees outward in the disk radial direction, so that the pressing piece 21 is placed in front of the fixed piece 20.
will be placed. The front piece 27 is bent so that its back surface is in close contact with the lower wall 2c, with the center of the radius of the bent portion set sufficiently toward the disk side.

The fixed piece 20 also includes a standing plate part 20b that is continuous with the connecting piece 22 and faces the pressing piece 21, and a floor part 20a that is bent and formed to be continuous and perpendicular to the standing plate part 20b. A part of the inner side of the upright plate part 20b is bent from the center to both sides to form two stoppers 20c facing each other at an appropriate interval in the axial direction of the disk. Further, by folding out a stopper 20c on the floor portion 20a and the front piece 27, a subsequent standing plate portion 20
Common notch 23 continuous to the recess formed in b
is provided so that a part of the outer peripheral edge of the disk can be exposed inside this notch 23, thereby preventing contact between the disk and the pad spring 19.

The floor portion 20a of the fixing piece 20 is placed on the support surface 8 of the torque member 1, and the stopper 20c is placed on the support surface 8 of the torque member 1.
By engaging with the groove 2b provided inside the arm portion of the torque member 1, the pad spring 19 is positioned and fixed to the torque member 1. Therefore, when assembled, the stopper 20c is arranged so that its plane extends substantially parallel to both side surfaces of the disk. Then, on the upper surface of the floor part 20a, each ear part 6a of the outer pad 6 and the inner pad 7,
7a is placed thereon, and the lower ends of the pressing pieces 21 commonly abut on the upper surfaces of both ear portions 6a, 7a.

In addition, outer pad 6 and inner pad 7
Both consist of a back plate 24 and a friction material 25, which are each fixed with an adhesive or the like,
Additionally, ear portions 6a and 7a are provided at both end portions of the back plate 24, respectively.

Further, in this embodiment, the side piece 28 is provided on the side surface of the torque member 1 on the disk side that is continuous with the support surface 8, but it is provided on the side opposite to this side.
The front piece 27 may be formed by bending.

Next, the effect will be explained.

To assemble this disc brake, first place the pair of pad springs 19 with the floor part 20a of the fixed piece 20 on the support surface 8 of the arm part 2 of the torque member 1, and then place the stopper 20c on the arm part 2. 2 Inner groove 2
b, thereby positioning and attaching it to the torque member 1. At this time, the front piece 27 and the side piece 2
The center of the radius of curvature of the bent portion forming the boundary line that distinguishes the curved portion from the lower wall 2c
The back surface of the front piece 27 can be brought into close contact with the lower wall 2c because it can be set closer to the disk than the inner end surface of the support surface 8 at a distance that does not contact the edge of the support surface 8 (0.5 mm or more in normal bending processing).

Next, on both sides of the disk, turn each friction material 25 toward the disk and attach the ears 6 on both sides.
a and 7a are inserted between the fixing piece 20 and the pressing piece 21 of the pad spring 19 to slidably support the outer pad 6 and the inner pad 7 on the torque member 1. After that, the caliper 4 is placed between the pads 6 and 7 so as to face a part of the outer periphery of the disk, and the tip of the bolt 15 held at the base 4a of the caliper 4 is inserted into the hole in the arm portion 2 of the torque member 1 in advance. The caliper 4 is fixed to the slide pin 5 by tightening the bolt 15. Thereafter, the torque member 1 is fixed to the vehicle body side member.

According to the disc brake assembled in this way, as shown in an enlarged view in FIG.
The floor portion 20a of the fixed piece 20 and the front piece 27 can be vertically disposed only on the plane.
It is possible to eliminate unnecessary gaps between the lower wall 2c and the front piece 27 as shown in the figure. Therefore, if the dimensions of the brake pads 6 and 7 are the same, the depth dimension of the part where the pad spring 19 contacts the support surface 8 is C, and the amount of support is increased by the length B shown in FIG. be able to. Also,
This means that if the dimensions of the support surface 8 are the same, the dimensions on the brake pads 6 and 7 side can be increased, so if the friction material 25 is made larger, its pressure contact area will increase, resulting in a greater braking force. can occur.

Therefore, when braking, the brake pedal (not shown)
When brake fluid pressure is supplied from the master cylinder (not shown) into the cylinder by the operation of The caliper 4 moves in the opposite direction to the direction of movement, and presses the outer pad 6 installed inside the arm portion 4b against the other side surface of the disk. As a result, both brake pads 6 and 7
Frictional force is generated between the friction material 25 and the disk,
The braking force generated thereby is transmitted from the back plate 24 to the arm portion 2 of the torque member 1, and further transmitted from the trunk 3 to the vehicle body side for braking.

At this time, even if an excitation force is applied to the brake pads 6, 7, lifting of the brake pads 7, etc. can be suppressed by the spring force of the pressing piece 21 given by the rigidity of the pad spring 19. .

As explained above, in the present invention, side pieces integral with the fixing piece of the pad spring are disposed along each of the inner surfaces of the torque member that continuously face each other from the pair of brake pad supporting surfaces. In addition, a pair of front pieces are individually bent to be continuous with the side pieces. Therefore, since both front pieces are not bent directly from the floor of each fixed piece corresponding to the support surface of the brake pad, the front pieces are bent relative to this floor through a curve for bending. They can be butted at right angles to each other without any problems. Therefore, wasted space in the portion where the torque member and the brake pad face each other can be eliminated, and as a result, the effect of increasing the amount of support for the brake pad or expanding the area of the brake pad can be obtained.

Further, according to the present invention, the side pieces of the pad spring are connected to the inner surfaces of the torque member that are continuous from the pair of brake pad support surfaces provided at positions sandwiching the disk, and that face each other with the disk sandwiched therebetween. It is located along the The torque member is
Usually, it is cast, and the dimensional accuracy is not high if it is removed from the mold, so parts that require high precision are subjected to machining such as grinding. The two opposing inner surfaces of the torque member are machined to have high precision because a brake disk is interposed between the two surfaces. In this invention, since the side piece is provided on the inner surface with high dimensional accuracy, the position of the side piece and the front piece continuous thereto can be set accurately.For this reason as well, High accuracy can be maintained in the portion where the torque member and the brake pad face each other, and wasted space can be eliminated.

[Brief explanation of drawings]

Fig. 1 is a front longitudinal cross-sectional view of a conventional disc brake with one side omitted, Fig. 2 is a perspective view of a conventional pad spring, Fig. 3 is an enlarged explanatory view of the same main part, and Fig. 4 is a perspective view of a conventional disc brake.
The figure is a front longitudinal sectional view with one side omitted showing an embodiment of the present invention, FIG. 5 is a partially sectional plan view, and FIGS. 6 to 10 show a pad spring according to the present invention. 6 is a perspective view, FIG. 7 is a front view, FIG. 8 is a plan view, FIG. 9 is a sectional view taken along the line -- in FIG. 7, and FIG. 10 is an enlarged explanatory view of the main parts. 1... Torque member, 2... Arm, 3... Executive, 4... Caliper, 4a... Base, 4b... Arm, 5... Slide pin, 6... Outer pad (brake pad), 7... Inner pads (brake pads), 6a, 7a... ears, 8... support surface,
19...Padded spring, 20...Fixing piece, 2
0a...floor part, 20b...standing plate part, 20c...stopper, 20d...apron, 21...pressing piece,
22... Connecting piece, 23... Notch, 27... Front piece, 28... Side piece.

Claims (1)

[Claims] 1. A torque member fixed to the vehicle body side, a pair of brake pads that are slidably supported by this torque member and pinch a disk that rotates together with the wheels, and a sliding portion between the brake pads and the torque member. A fixing piece that is interposed and engages with the torque member for positioning, a pressing piece that is integrally formed continuously with the fixing piece in the outer circumferential direction of the disk and that presses the brake pad toward the torque member, and a fixing piece. A pad spring having a pair of front pieces that are integrally formed continuously in the direction of the center of rotation of the disk and individually facing the side surfaces of each brake pad, wherein the pad spring is located at a position of the torque member sandwiching the disk. Two side pieces, which are integral with the fixing piece of the pad spring, are individually bent and arranged along the respective inner surfaces that are continuous from the provided pair of brake pad support surfaces and that face each other across the disk. A disc brake characterized in that the pair of front pieces are individually bent so as to be continuous with each of the side pieces.