JP4194967B2 - Disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disc brake capable of improving manufacture efficiency. <P>SOLUTION: In a bottom part side inner circumferential surface of a cylinder 18 of a caliper 14, recessed parts 103 that are extended in the cylinder axial line direction are formed. Pins 97 are provided to penetrate a push rod 44 and a spring cover 84 enclosing a push rod energization member to be fixed to the push rod 44 at one end, and formed as a protruded part 96 to be engaged with the recessed part 103 at the other end. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a disc brake in which a piston slides in a cylinder not only by introducing hydraulic pressure but also by pressing means.

Among the disc brakes, a parking brake combined type disc brake used for automobiles and the like has a piston slidably fitted into a bottomed cylindrical cylinder into which hydraulic pressure is introduced, and a pair of pads is formed by sliding the piston. A caliper that contacts the disc, a pressing mechanism that is disposed outside the cylinder and generates a pressing force in the sliding direction of the piston, a push rod that is disposed in the cylinder and is moved by being pressed by the pressing mechanism, and is disposed in the cylinder. A clutch member that is screwed to one end of the push rod and abuts on the piston and is pressed by the push rod to press the piston, and a push rod biasing member that is disposed in the cylinder and biases the push rod toward the pressing mechanism. Including the push rod and the push rod biasing member. Are provided with a spring cover held between the Shuroddo (e.g., see Patent Document 1).
JP-A-9-250580

  In the above-described disc brake, the push rod needs to be prevented from rotating in order to advance and retract the clutch member. For this reason, the push rod protrudes radially outward and engages with the concave portion of the cylinder to prevent rotation against the cylinder. The convex part to be formed is formed. On the other hand, since the push rod holds the spring with the spring cover, an engagement recess for engaging the spring cover is formed. Thus, when the shape of the push rod is complicated, there is a problem that the manufacturing efficiency of the entire disc brake is lowered.

  Therefore, an object of the present invention is to provide a disc brake capable of improving manufacturing efficiency.

In order to achieve the above object, the present invention provides a pair of pads disposed on both sides of a disk and a piston slidably fitted to a bottomed cylindrical cylinder into which hydraulic pressure is introduced and the piston. A caliper that brings the pair of pads into contact with the disk by sliding, a pressing mechanism that is disposed outside the bore of the cylinder and generates a pressing force in the sliding direction of the piston, and is disposed within the cylinder, A push rod that is pressed and moved by a mechanism, and a clutch member that is disposed in the cylinder, is screwed to one end of the push rod, contacts the piston, and is pressed by the push rod to press the piston A push rod biasing member disposed in the cylinder and biasing the push rod toward the pressing mechanism, and the push rod And the push rod urging member, and a spring cover for holding the push rod urging member between the push rod and a cylinder axial direction on the inner peripheral surface of the bottom side of the cylinder a recess extending in the formation, the through long elongated hole axially formed in the spring cover, one end is fixed to the fitting hole along the radial direction is formed on the push rod, the other end the a spring cover projects radially outwardly have a pin that is a convex portion to be fitted into the recess, is characterized in installing an additional said spring cover to the push rod by the pin.

  According to the present invention, the spring cover can be attached to the push rod by passing the pin through the spring cover and fixing one end of the pin to the push rod. Further, the push rod can be prevented from rotating with respect to the cylinder by fitting the convex portion at the other end of the pin into the concave portion formed on the inner peripheral surface on the bottom side of the cylinder so as to extend in the cylinder axial direction. Therefore, it is not necessary to form a protrusion projecting outward in the radial direction on the push rod and an engagement recess for engaging the spring cover, so that the shape of the push rod can be simplified. Therefore, manufacturing efficiency can be improved.

  A disc brake according to an embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the disc brake of the present embodiment is slidably supported with a carrier 11 fixed to a non-rotating portion of the vehicle and disposed on both sides of the carrier 11 via a disc 12. And a caliper 14 supported by the carrier 11 so as to be slidable along the axial direction of the disk 12 and sandwiching the pair of pads 13A and 13B from both sides. Yes.

  The caliper 14 has a bottomed cylindrical cylinder 18 that opposes the opening 17 on the opposite side of the disk 12 with respect to one pad 13A, and a disk path 19 that extends from the cylinder 18 across the outer periphery of the disk 12. And a caliper body 21 having a claw portion 20 extending from the disc path portion 19 and extending to the other pad 13B so as to face the opposite side of the disc 12.

  The caliper 14 is formed in a bottomed cylindrical shape, and a piston 26 slidably fitted into the bore 25 of the cylinder 18 of the caliper body 21 with the bottom 24 side facing the pad 13A side, A ring-shaped piston seal 27 that seals a gap with the inner peripheral surface of the cylinder 18 is provided. The piston seal 27 is held in the seal groove 18A of the cylinder 18.

  The caliper 14 moves the piston 26 in the direction of the pad 13 </ b> A by the brake fluid pressure introduced between the cylinder 18 and the piston 26, so that the pair of pads 13 </ b> A and 13 </ b> B are moved between the piston 26 and the claw portion 20. It is brought into contact with the disk 12 by gripping from both sides.

  As described above, the piston 26 is moved in the direction from the cylinder 18 toward the claw portion 20 by the brake hydraulic pressure introduced from the master cylinder (not shown) into the cylinder 18 during normal braking by a depressing operation on the brake pedal. Thus, the pair of pads 13 are pressed against the disk 12 to generate a braking force. On the other hand, a parking brake mechanism 30 is provided in the cylinder 18 to generate a braking force by pressing the pair of pads 13 against the disk 12 by mechanically moving the piston 26 instead of the brake fluid pressure. Yes.

  The parking brake mechanism 30 has a cam mechanism (pressing mechanism) 32 that is disposed outside the bore 25 of the cylinder 18 and generates a pressing force in the sliding direction of the piston 26.

  That is, a cam hole 35 is formed in the bottom portion 33 of the cylinder 18 so as to be separated from the bottom surface 34 that forms the bore 25 and in a direction orthogonal to the axial direction of the cylinder 18. Further, a bottom hole 36 penetrating on the axis from the center position of the bottom surface 34 to the cam hole 35 is formed, and a cam mechanism 32 is provided in the cam hole 35 and the bottom hole 36.

  The cam mechanism 32 has a substantially cylindrical cam body 39 that is rotatably inserted into a cam hole 35 via a bearing 38. The cam main body 39 is formed with a cam recess 40 that is recessed in a substantially V shape from the outer peripheral surface in the radial direction toward the center. The cam recess 40 is offset at the most recessed position with respect to the central axis of the cam body 39.

  The cam mechanism 32 includes a cam rod 42 having one end inserted into the cam recess 40 and the other end disposed on the bottom hole 36 side. The cam rod 42 changes the amount of protrusion from the cam body 39 according to the shape of the cam recess 40 when the cam body 39 is driven to rotate about an axis along a direction orthogonal to the axis of the cylinder 18. The cam body 39 is rotated by manual operation of a parking brake lever (not shown).

  A push rod 44 that is pressed by the cam rod 42 of the cam mechanism 32 and moves in the axial direction of the cylinder 18 is provided in the cylinder 18.

  The push rod 44 is divided into two parts: a front divided body 45 on the front side during forward movement, that is, on the piston 26 side, and a rear divided body 46 on the rear side in forward movement, that is, on the cylinder bottom 33 side.

  The rear divided body 46 of the push rod 44 includes a shaft portion 48 and a flange portion 49 that spreads radially outward from one end side of the shaft portion 48, and the flange portion 49 has a plurality of specific shapes along the radial direction. In FIG. 2, two circular fitting holes 50 having a circular cross section are formed at positions different from each other by 180 degrees as shown in FIG. Further, a plurality of, specifically, two circular cross-sectional fitting holes 51 along the radial direction are formed in the flange portion 49 at positions different from each other by 180 degrees and at positions different from the fitting holes 50 by 90 degrees from the outer peripheral side. It has been drilled. The fitting holes 50 and 51 are all aligned in the axial direction of the rear divided body 46, and the depth of the fitting hole 50 is formed deeper than the depth of the fitting hole 51. .

  A guide hole 52 that is recessed along the axial direction is formed at the axial center position on the flange 49 side of the rear divided body 46, and the guide hole 52 has a hexagonal hole shape. The guide hole 52 is formed at a position on the inner side of all the fitting holes 50 and 51. Furthermore, a contact recess 53 that is recessed in the axial direction is formed on the shaft 48 side of the rear divided body 46.

  The rear divided body 46 has a shaft portion 48 slidably fitted into the bottom hole 36 of the cylinder 18, and in this state, the contact recess 53 is inserted into the distal end side of the cam rod 42 of the cam mechanism 32. Storing. A ring-shaped push rod seal 57 is provided between the shaft portion 48 and the bottom hole 36 of the cylinder 18 to seal these gaps. The push rod seal 57 is held by the shaft portion 48 of the rear divided body 46.

  The front divided body 45 of the push rod 44 has a shape having a shaft portion 61 in which a male screw 60 is formed on the outer peripheral surface in the radial direction and a flange portion 62 that extends radially outward from one end side of the shaft portion 61. On the flange portion 62 side, a guide protrusion 63 that protrudes along the axial direction is formed at the axial center position, and the guide protrusion 63 has a hexagonal column shape. Then, the front divided body 45 brings the flange portion 62 into contact with the flange portion 49 of the rear divided body 46, and at this time, the guide protrusion 63 is formed in the guide hole portion 52 of the rear divided body 46. Can be fitted. Thereby, the front division body 45 is connected to be movable in the axial direction (that is, can be separated and approached) in a state where relative rotation is restricted with respect to the rear division body 46.

  The parking brake mechanism 30 has a substantially cylindrical clutch member 66 that is screwed into the male screw 60 of the shaft portion 61 of the front divided body 45 of the push rod 44 within the cylinder 18 with a female screw 65 formed on the inner diameter side. is doing.

  Here, as for the inner diameter side of the piston 26, the bottom 24 side is a small-diameter inner diameter portion 68, and the opening side of the small-diameter inner diameter portion 68 is a larger-diameter inner diameter portion 69 having a larger diameter. A tapered surface portion 70 is formed between the portion 68 and the large-diameter inner diameter portion 69 so that the large-diameter inner diameter portion 69 side has a large diameter.

  The clutch member 66 has a front end side that is a fitting portion 72 that fits into the small-diameter inner diameter portion 68 of the piston 26, and a taper portion 73 that is adjacent to the fitting portion 72 and contacts the taper surface portion 70 is formed. .

  Here, when the amount of protrusion of the cam rod 42 is changed from small to large by rotating the cam body 39 of the cam mechanism 32, the rear divided body 46 and the front divided body 45 of the push rod 44, the clutch member 66, Linearly moves in the axial direction, and the clutch member 66 abuts against the taper surface portion 70 of the piston 26 at the taper portion 73 to slide the piston 26 toward the pad 13 with respect to the cylinder 18.

  The male screw 60 of the front divided body 45 of the push rod 44 and the female screw 65 of the clutch member 66 constitute a screwing portion 74. The threaded portion 74 has a clearance that can move in the axial direction by a predetermined amount without rotating between the front divided body 45 and the clutch member 66.

  In addition, an air release hole 76 is formed on the bottom 24 side of the piston 26 to open the gap with the clutch member 66 to the atmosphere.

  In addition, a ring-shaped clutch member seal 77 is provided between the fitting portion 72 of the clutch member 66 and the small-diameter inner diameter portion 68 of the piston 26 to seal these gaps. The clutch member seal 77 is held by the fitting portion 72 of the clutch member 66.

  The parking brake mechanism 30 has an adjusting portion 80 that adjusts the position of the clutch member 66 and the front divided body 45 of the push rod 44 in the cylinder 18.

  The adjusting portion 80 is supported between the piston 26 and the clutch member 66 by a retaining ring 82 that is engaged with an engaging groove 81 formed in the large-diameter inner diameter portion 69 of the piston 26. When the piston 26 moves in the axial direction by the brake fluid pressure introduced into the cylinder 18, the piston 26 is caused to follow the piston 26 while rotating the clutch member 66 with respect to the push rod 44 which is substantially stopped. Move in the axial direction.

  Further, when the front divided body 45 of the push rod 44 linearly moves in the axial direction, the adjusting portion 80 does not rotate the clutch member 66 with respect to the front divided body 45. The clutch member 66 is linearly moved integrally with the push rod 44 by the threaded portion 74 including the female screw 65.

  In the cylinder 18, the parking brake mechanism 30 includes a spring cover 84 provided so as to cover a part of the clutch member 66 and a part of the front divided body 45 and the rear divided body 46 of the push rod 44, and a push rod. And a push rod urging spring (push rod urging member) 85 interposed between the flange portion 62 of the front divided body 45 and the piston 26 side of the spring cover 84.

  The spring cover 84 includes a ring-shaped portion 87 into which the clutch member 66 is inserted, a cylindrical portion 88 extending from the outer diameter side of the ring-shaped portion 87 to one side in the axial direction, and a ring-shaped portion of the cylindrical portion 88. A plurality of locking pieces 89 cut and raised radially outward from the opposite side with respect to the portion 87, and a plurality of concrete extending further from the opposite side to the axial direction side with respect to the ring-shaped portion 87 of the cylindrical portion 88. Has four extending pieces 90.

  In the spring cover 84, each extending piece 90 passes outside the outer peripheral surface of the flange portion 62 of the front divided body 45 of the push rod 44 and further passes outside the outer peripheral surface of the flange portion 49 of the rear divided body 46. So as to extend.

  In the present embodiment, a long hole 93 that is long in the axial direction of the spring cover 84 is formed in each extending piece 90 of the spring cover 84 so that the positions of the spring cover 84 in the axial direction are aligned with each other. All the long holes 93 have the same shape, and both ends have a semicircular shape convex in the opposite direction.

  A headed pin (pin) 97 comprising a columnar shaft portion 95 and a columnar head portion (convex portion) 96 having an axis line arranged in a direction orthogonal to the axis line of the shaft portion 95 is provided. After the elongated hole 93 of the spring cover 84 is penetrated from the outside in the shaft portion 95, it is press-fitted into the fitting hole 50 of the rear divided body 46 on the tip side of the shaft portion 95 which is one end thereof. Further, a cylindrical headless pin 99 having no head is inserted into the fitting hole 51 of the rear divided body 46 after passing through the elongated hole 93 of the spring cover 84 from the outside. At this time, the headless pin 99 does not protrude outwardly from the extended piece 90 of the spring cover 84, and only the head 96 at the other end of the headed pin 97 has a radius larger than that of the extended piece 90 of the spring cover 84. Projects outward in the direction.

  Here, with the push rod biasing spring 85 and the front divided body 45 and the rear divided body 46 of the push rod 44 inserted into the spring cover 84, the headed pin 97 and the headless pin 99 are changed to the rear divided body 46. By attaching as described above, the rear divided body 46 is prevented from coming off from the spring cover 84. As a result, the spring cover 84 is formed of the front divided body 45 and the rear divided body 46 of the push rod 44 and the push rod biasing spring. 85 and the push rod biasing spring 85 is held between the push rod 44 and the push rod 44.

  As described above, the front divided body 45 of the push rod 44, the rear divided body 46 of the push rod 44, the push rod biasing spring 85, and the spring cover 84 are in a stage before being assembled to the cylinder 18. As shown in FIG. 3, the cartridge 101 is one assembly.

  Specifically, for example, a push rod biasing spring 85 is inserted so as to contact the ring-shaped portion 87 of the spring cover 84, and the front divided body 45 of the push rod 44 is attached to the shaft portion 61 side with a push rod. The flange portion 62 is inserted into the inside of the biasing spring 85 and is brought into contact with the push rod biasing spring 85 while passing through the inside of the extending piece 90. Then, the rear divided body 46 of the push rod 44 is fitted into the guide projection portion 63 of the front divided body in the guide hole portion 52 on the flange portion 49 side, and the flange portion 49 is moved to the front divided body 45. It is made to contact | abut to the flange part 62 of this. In this state, the headed pin 97 and the headless pin 99 are press-fitted into the fitting hole 50 through the elongated hole 93 of the spring cover 84, respectively.

  In the state of the cartridge 101 as described above, the shaft portion 95 and the headless pin 99 of the headed pin 97 are each in a state where the movement of the spring cover 84 in the circumferential direction is restricted with respect to the spring cover 84. As shown in FIG. 4, the cover 84 is movable in the axial direction within the range of the elongated hole 93, so that the rear divided body 46 of the push rod 44 fixed to the shaft portion 95 of the headed pin 97 and the headless pin 99, The front divided body 45 that is engaged with the spring cover 84 in a state in which the rotation is restricted can be relatively moved in a predetermined range in the axial direction in a state in which the rotation is restricted with respect to the spring cover 84.

  And the recessed part 103 extended in the axial direction of the cylinder 18 is formed in the position 180 degrees mutually different in the internal peripheral surface of the bore 25 by the side of the bottom 24 of the cylinder 18. As shown in FIG. These concave portions 103 have a substantially semicircular shape in which a cross section perpendicular to the extending direction is convex in the radial direction of the cylinder 18.

  A head 96 of a headed pin 97 protruding radially outward from a position 180 degrees different from the cartridge 101 is fitted into the recess 103 of the cylinder 18 so as to be slidable. Here, the axial direction of the head 96 of the headed pin 97 is aligned with the axial direction of the cartridge 101, and the cartridge 101 is inserted into the cylinder 18 in a state where the axial line is aligned with the axial line of the cylinder 18. Thus, the concave portion 103 along the axial direction of the cylinder 18 is satisfactorily entered. Further, since the head 96 of the headed pin 97 has a cylindrical shape and the concave portion 103 has a semicircular shape, the head 96 hits the concave portion 103 at a curved portion. Can be satisfactorily slid even if it is not strictly controlled.

  In this way, the cartridge 101 is fitted into the recess 103 of the cylinder 18 at the head 96 of the headed pin 97, whereby the cartridge 101 is restricted from rotating around the axis with respect to the cylinder 18. That is, by restricting the turning of the headed pin 97 around the axis of the cylinder 18, the rear divided body 46 integrated with the headed pin 97, and the headed pin 97 and the headless pin are added to the rear divided body 46. The spring cover 84 that is prevented from rotating at 99 and the front divided body 45 that is prevented from rotating by the hexagonal column-shaped guide protrusion 63 in the hexagonal hole-shaped guide hole 52 of the rear divided body 46 are rotated with respect to the cylinder 18. It will be regulated.

  A locking step 106 is formed in the cylinder 18. The locking step 106 includes an annular engaging groove 107 formed on the inner peripheral surface of the bore 25 of the cylinder 18 and a C-shaped retaining ring 108 that engages with the engaging groove 107. Yes.

  When assembling the above disc brake, the bearing 38 and the cam body 39 are inserted into the cam hole 35 of the caliper body 21 and the cam recess 40 is directed toward the bottom hole 36. In this state, the cam rod 42 is moved to the caliper body 21. The cylinder 18 is inserted from the opening 17 side and further inserted into the cam recess 40 through the bottom hole 36.

  Next, the cartridge 101 assembled in advance as described above is inserted into the cylinder 18 from the opening 17 side with the push rod seal 57 attached, and the shaft portion 48 of the rear divided body 46 of the push rod 44 is inserted. The cam rod 42 is inserted into the contact concave portion 53 of the shaft portion 48 while being fitted into the bottom hole 36 of the bottom portion 33, and finally contacted with the extended piece portion 90 to the bottom surface 34. Note that the flange portion 49 of the rear divided body 46 has a gap with the bottom surface 34 in a state where the extended piece 90 is in contact with the bottom surface 34.

  Then, a C-shaped retaining ring 108 is inserted into the cylinder 18, and the retaining ring 108 is engaged with the engagement groove 107 of the cylinder 18. Then, the retaining ring 108 locks the locking piece 89 of the spring cover 84 of the cartridge 101, thereby restricting the cartridge 101 from coming off and moving the spring cover 84 in the axial direction.

  On the other hand, the clutch member 66 to which the clutch member seal 77 is attached is fitted to the piston 26, and the adjustment portion 80 is locked to the piston 26 by the retaining ring 82, whereby the piston 26, the clutch member 66, and the adjustment portion 80 are engaged. As a separate assembly, the caliper 14 is assembled by screwing the clutch member 66 into the push rod 44 while fitting the assembly into the cylinder 18.

  In the disc brake having such a configuration, when the cam main body 39 of the cam mechanism 32 is rotated by operating a parking brake lever (not shown), the cam rod 42 of the cam mechanism 32 increases the protruding amount, and the push rod 44 The rear divided body 46 moves in the direction of the disk 12 while moving the headed pin 97 and the headless pin 99 within the range of the elongated hole 93. Then, the front divided body 45 that contacts the rear divided body 46 moves in the direction of the disk 12, and the clutch member 66 moves integrally therewith, moving the piston 26 in the direction of the disk 12, and mechanically. A pair of pads 13 are pressed against the disk 12.

  On the other hand, when the brake fluid pressure is introduced between the cylinder 18 and the piston 26 by a brake operation with a normal brake pedal, the fluid pressure acts on the piston 26 with respect to the pressure receiving area by the piston seal 27, and the direction of the disk 12. The driving force will be generated. On the other hand, the hydraulic pressure also acts on the clutch member 66 with respect to the pressure receiving area by the clutch member seal 77 to generate a propulsive force in the direction of the disk 12. The piston 26 is pushed by moving in the axial direction without rotating by the screwing clearance in the screwing portion 74.

  When the brake fluid pressure is further introduced into the cylinder 18 and exceeds a predetermined fluid pressure, the clutch member 66 is pressed against the piston 26 by the fluid pressure acting on the clutch member 66, and the fluid pressure is applied to the piston 26. As a result, a driving force in the direction of the disk 12 is generated, and a hydraulic pressure also acts on the clutch member 66 to generate a driving force in the direction of the disk 12.

  At this time, on the other hand, hydraulic pressure also acts on the rear divided body 46 of the push rod 44 with respect to the pressure receiving area by the push rod seal 57, and a propulsive force in the opposite direction to the disk 12 is generated. Since the push rod 44 is divided into the front divided body 45 and the rear divided body 46 as described above, the propulsive force in the opposite direction to the disc 12 of the rear divided body 46 is given to the front divided body. 45 can be separated from the propulsive force generated in the direction of the disk 12.

  According to the disc brake of the present embodiment described above, the headed pin 97 is passed through the elongated hole 93 of the spring cover 84 and one end thereof is fixed to the rear divided body 46 of the push rod 44, thereby the spring cover 84. Can be attached to the push rod 44. Further, the head 96 at the other end of the headed pin 97 is fitted into a recess 103 formed on the inner peripheral surface of the bore 25 on the bottom 33 side of the cylinder 18 so as to extend in the cylinder axial direction, thereby enabling the clutch member. The push rod 44 that needs to be prevented from rotating in order to advance and retract 66 can be prevented from rotating with respect to the cylinder 18. Therefore, it is not necessary to form a protrusion projecting outward in the radial direction and an engagement recess for engaging the spring cover 84 in the push rod 44, so that the shape of the push rod 44 can be simplified. Further, it is not necessary to crimp the spring cover 84 when the cartridge 101 is assembled. Therefore, manufacturing efficiency can be improved.

  Moreover, since it has the structure which press-fits the headed pin 97 and the headless pin 99 to the rear part division body 46 of the push rod 44, while being able to simplify a component, manufacturing efficiency can be improved. Further, since the cartridge 101 is formed by press-fitting the headed pin 97 and the headless pin 99 into the rear divided body 46 of the push rod 44, the accuracy of the cartridge 101 is improved.

  A fitting hole 50 is formed in the front divided body 45 of the push rod 44, and the headed pin 97 is attached to the front divided body 45 through the elongated hole 93 of the spring cover 84 whose position is changed in accordance with this. You may make it fit in the fitting hole 50. FIG. Further, in the case where the push rod 44 is not divided into a front divided body and a rear divided body, a fitting hole 50 is formed in the push rod 44 and the headed pin 97 is attached to the push rod 44 in the same manner as described above. It can be applied by fitting through the 84 long holes 93.

  Further, in any case, the headed pin 97 may be screwed instead of press-fitted. In this case, in order to facilitate phase alignment with the recess 103, the head 96 of the headed pin 97 is preferably made spherical instead of cylindrical. Of course, even in the case of press-fitting as described above, phase matching can be facilitated by making the head 96 spherical instead of cylindrical.

  In addition, the recess 103 of the cylinder 18 may have a rectangular cross section perpendicular to the extending direction, and the head 96 of the headed pin 97 may have a rectangular parallelepiped shape or a cubic shape.

Further, the elongated hole 93 of the spring cover 84 may be rectangular. In this case, the portion guided by the elongated hole 93 of the headed pin 97 and the headless pin 99 can be a square cross section.
Further, although the male screw 60 is formed on the push rod 44 and the female screw 65 is formed on the clutch member 66, the male screw and the female screw may be provided on the contrary.

It is sectional drawing which shows the disc brake of one Embodiment of this invention. It is sectional drawing which follows the XX line shown in FIG. 1 of the disc brake of one Embodiment of this invention. It is a side view which shows the internal component made into the cartridge of the disc brake of one Embodiment of this invention. It is the elements on larger scale which show the movement range of the headed pin with respect to the slot of the disc brake of one embodiment of the present invention, (a) is the state farthest from the disc rotor, (b) is an intermediate state, ( c) shows the state located closest to the disk rotor.

Explanation of symbols

12 disc 13A, 13B pad 14 caliper 18 cylinder 26 piston 32 cam mechanism (pressing mechanism)
44 Push rod 66 Clutch member 84 Spring cover 85 Push rod biasing spring (push rod biasing member)
96 head (convex)
97 Headed Pin (Pin)
103 recess

Claims (1)

A pair of pads arranged on both sides via a disc;
A caliper that slidably fits a piston with a bottomed cylindrical cylinder into which hydraulic pressure is introduced and that causes the pair of pads to contact the disk by sliding the piston;
A pressing mechanism arranged outside the bore of the cylinder and generating a pressing force in the sliding direction of the piston;
A push rod disposed in the cylinder and moved by being pressed by the pressing mechanism;
A clutch member disposed in the cylinder, screwed to one end of the push rod and abutting the piston, and pressed by the push rod to press the piston;
A push rod biasing member disposed in the cylinder and biasing the push rod toward the pressing mechanism;
In a disc brake including the push rod and the push rod urging member, and a spring cover that holds the push rod urging member between the push rod,
A concave portion extending in the cylinder axial direction is formed on the inner peripheral surface of the bottom side of the cylinder,
It penetrates a long hole in the axial direction formed in the spring cover , one end is fixed to a fitting hole along the radial direction formed in the push rod , and the other end is radially outward from the spring cover. protruding to have a pin that is a convex portion to be fitted into the recess, disc brakes, wherein installing an additional said spring cover to the push rod by the pin.

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