JP5562294B2 - Vehicle disc brake - Google Patents

Description

  The present invention relates to a vehicle disc brake used for a traveling vehicle such as an automobile or a motorcycle, and more particularly to a caliper bracket structure in which a caliper body is fixed to a vehicle body at one side of a disc rotor.

  Conventionally, a vehicle disc brake has been provided with a torque receiving portion that receives a braking torque by abutting against a friction pad at the time of forward braking of the vehicle and at the time of backward braking of the vehicle, on both side portions in the caliper bracket disc rotation direction (for example, Patent Document 1). reference.).

JP-A-10-159879

  However, in the thing of the above-mentioned patent document 1, since the torque receiving part was each formed in the both sides of a caliper bracket, the thickening and enlargement of a caliper bracket were unavoidable, and the weight also increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle disc brake that has a simple structure and can reduce the size and weight of a caliper bracket while ensuring necessary rigidity.

  In order to achieve the above object, a disk brake for a vehicle according to the present invention is disposed on one side portion of a disk rotor, and is provided on an action portion having a cylinder portion that accommodates a piston, and on the other side portion of the disk rotor, A caliper body is formed by connecting a reaction portion having a reaction force claw with a bridge portion, and the caliper body is fixed to a caliper bracket fixed to a vehicle body at one side portion of the disk rotor. A pair of slide pins respectively arranged on the disk feed-out side and the disk feed-in side at the time of forward movement, and a pair of slide pin holding holes into which the slide pins are movably inserted in the axial direction, respectively, in the disk axial direction A vehicular disc block that is slidably supported and has friction pads disposed on the working portion side and the reaction portion side with the disc rotor interposed therebetween. The caliper bracket includes a body portion provided with a vehicle body mounting portion having a bolt insertion hole for inserting a vehicle body mounting bolt and a mounting seat surface on a disk insertion side and a disk discharge side when the vehicle moves forward, A support arm that protrudes from the vehicle body mounting part on the disk delivery side to the outer periphery of the disk, and a slide pin that projects from the tip of the support arm to the disk delivery side of the bridge when the vehicle moves forward and straddles the outer periphery of the disk rotor A holding portion, and a reverse braking torque receiving portion that receives the braking torque by contacting the friction pad on the acting portion side during vehicle reverse braking on the disk delivery side of the main body portion is opposite to the mounting seat surface. A build-up portion formed so as to protrude toward the disc rotor side and built up on the non-disk rotor side of the support arm excluding the mounting seat surface in accordance with the protruding amount of the torque receiving portion during reverse braking It is characterized by providing.

  Further, when the friction pad on the action part side is in a new state, the build-up part is formed so as to protrude to the side opposite to the disk rotor from the position where the torque receiving part at the time of reverse braking supports the friction pad. Good. Further, it is preferable that the torque receiving portion at the time of reverse braking is formed with an inclined surface in which the disk insertion side when the vehicle moves forward of the protruding portion protruding to the side opposite to the disk rotor gradually becomes thinner toward the disk insertion side. is there. Furthermore, the slide pin holding portion is formed with a slide pin holding hole that opens on the side opposite to the disk rotor of the tip end portion of the support arm, and the slide pin holding portion at the tip end portion of the support arm that is a part of the build-up portion. It is preferable to form a flat portion around the opening of the hole, which is formed flush with the surface of the build-up portion and is flattened. In addition, when the caliper bracket is formed by casting, the surface of the build-up portion can be flattened only on the flat portion, and the surfaces of the other build-up portions can be left in a cast surface.

  According to the vehicle disc brake of the present invention, the meat piled up on the side opposite to the disc rotor of the support arm excluding the mounting seat surface of the vehicle body mounting bolt formed on the caliper bracket in accordance with the protruding amount of the torque receiving portion during reverse braking. By providing the raised section, it is possible to secure the rigidity of the torque receiving section at the time of reverse braking provided on the disk delivery side, simplification of the shape on the disk entry side and thin wall in the caliper bracket without the torque receiving section The caliper bracket can be reduced in size and weight.

  Further, when the friction pad on the working part side is in a new state, the build-up part is formed so as to protrude to the side opposite to the disc rotor from the position where the torque receiving part at the time of reverse braking supports the friction pad. As a result, the friction pad can be reliably supported, and the rigidity of the caliper bracket on the disk delivery side can be further improved. Further, the reverse braking torque receiving portion is formed by forming the disk insertion side at the time of vehicle advancement of the protruding portion protruding to the side opposite to the disk rotor with an inclined surface that gradually becomes thinner toward the disk insertion side. The braking torque received by the torque receiving portion during reverse braking can be transmitted to the main body well while avoiding interference with the portion.

  In addition, by setting the flat part formed at the tip of the support arm and the surface of the built-up part to be flush with each other, the processing of the flat part can be easily performed, and only the flat part is By processing and leaving others as cast surfaces, the number of processing steps does not increase due to the formation of the built-up portion.

1 is a front view of a vehicle disc brake showing an embodiment of the present invention. FIG. 3 is a rear view of the vehicle disc brake. It is a top view of the disk brake for vehicles similarly. It is a bottom view of the disk brake for vehicles similarly. It is a cross-sectional top view of the disk brake for vehicles similarly. It is VI-VI sectional drawing of FIG. It is explanatory drawing which similarly shows the positional relationship of a caliper bracket and a friction pad. It is a front view of a caliper bracket. It is a top view of a caliper bracket similarly.

  FIG. 1 to FIG. 9 are diagrams showing an example of a vehicle disc brake according to the present invention. An arrow A in the drawing indicates the rotational direction of the disc rotor during forward traveling of the vehicle, and the disc rotation used in the following description. The entry side and the exit side are when the vehicle is traveling forward. An arrow B indicates the upper side of the vehicle body when the vehicle disc brake of the present invention is attached to the vehicle body.

  The disc brake 1 of this embodiment is a disc brake for an automobile, and bridges an action portion 3a arranged on one side portion of the disc rotor 2 and a reaction portion 3b arranged on the other side portion of the disc rotor 2. The caliper body 3 is formed by being connected by the portion 3c, and the caliper body 3 is arranged on the caliper bracket 4 fixed to the vehicle body on one side of the disc rotor 2, and the first slide arranged on both sides in the disc rotation direction. A pin 5 and a second slide pin 6 are supported so as to be slidable in the disk axial direction, and a pair of friction pads 7 and 8 are arranged opposite to each other with the disk rotor 2 interposed between the action part 3a and the reaction part 3b. doing.

  The caliper body 3 is formed by casting. The caliper body 3 is attached to the vehicle body via the caliper bracket 4 with the disk insertion side facing upward and the disk ejection side facing downward. Pin support arms 3d and 3e project from the disk entry side and the delivery side of the action part 3a, and the pin support arm 3e on the disk delivery side extends in the disk delivery direction from the action part 3a. A female screw hole 3f for attaching the first slide pin 5 to the tip is formed. The pin support arm 3d on the disk entry side extends from the position where the action portion 3a and the bridge 3c are continuous to the inner side in the disk radial direction and extends along the outer periphery of the disk rotor. A slide pin holding hole 3g made of a bag hole through which the second slide pin 6 is inserted is formed. In addition, a cylinder portion 3i having a cylinder hole 3h is formed in the action portion 3a, and a piston 9 formed in a cup shape is formed in the cylinder hole 3h so that the opening is movable toward the disk rotor side. It is inserted. A dust seal 11a and a piston seal 11b are mounted on the inner peripheral portion on the opening side of the cylinder hole 3h. A hydraulic pressure chamber 12 is defined between the cylinder hole 3h and the bottom of the piston 9, and a union hole and a bleeder hole communicating with the hydraulic pressure chamber 12 are provided on the bottom wall of the cylinder hole 3h.

  The reaction portion 3b is provided with a pair of reaction force claws 3k, 3k arranged in parallel to the inner side in the disk radial direction on the disk inlet side and the disk outlet side across the cylinder hole machining gap 3j. Circular claws 3m and 3m are formed through the force claws 3k and 3k, respectively. The reaction force claws 3k, 3k are formed with substantially rectangular recesses 3n, 3n on the side of the gap 3j on the side opposite to the disk rotor, and the through holes 3m, 3m are arranged in the recesses 3n, 3n.

  The caliper bracket 4 includes a vehicle body mounting portion 4c having a bolt insertion hole 4a through which the vehicle body mounting bolt is inserted and a mounting seat surface 4b formed around the opposite side of the disk rotor of the bolt insertion hole 4a. A main body part 4d provided on the disk delivery side, a support arm 4e projecting from the vehicle body mounting part 4c on the disk delivery side to the disk outer peripheral side, and a disk delivery side of the bridge part 3c from the tip of the support arm 4e And a slide pin holding part 4f that straddles the outer periphery of the disk rotor 2 and a slide pin attachment part 4g that protrudes from the vehicle body attachment part 4c on the disk feed-in side to the disk outer periphery side. The slide pin holding portion 4f includes a slide pin holding hole 4h formed of a bag hole through which the first slide pin 5 is inserted through the pin boot 10 and has an outer surface on the friction pad side formed in a flat shape so that when the vehicle advances. Forward braking torque receiving portions 4i and 4i that receive torque from the friction pad 7 on the action side and the friction pad 8 on the reaction side. Further, a flat portion 4j for abutment of a pin boot subjected to flattening is formed around the opening of the slide pin holding hole 4h at the tip of the support arm. The slide pin mounting portion 4g protrudes from the main body portion 4d to the inner peripheral side of the disc with respect to the outer peripheral edge of the disc rotor 2, and has a female screw hole 4k into which the second slide pin 6 is screwed.

  The main body 4d includes a first pad abutment seating surface 4m for supporting a disk inner peripheral side surface of the working part side friction pad 7 on the disk outer periphery side, and a disk feeding side of the working part side friction pad 7 on the outer periphery side of the disk. And a second pad abutment seating surface 4n for supporting the inner peripheral surface of the disc, respectively, and further on the disc delivery side of the second pad abutment seating surface 4n on the disc delivery side and in the radial direction of the disc rotor. On the inner side, it is perpendicular to the second pad abutment seating surface 4n, and in a direction parallel to the forward braking torque receiving portion 4i, it receives the torque from the friction pad 7 on the acting portion side when the vehicle moves backward. A braking torque receiving portion 4p is formed. The forward braking torque receiving portion 4i and the reverse braking torque receiving portion 4p are provided closer to the disk delivery side of the caliper bracket 4 than the cylinder portion 3i, and further pass through the centers C1 and C2 of the bolt insertion holes 4a. Arranged between the radial lines CL1, CL2. The reverse braking torque receiving portion 4p is parallel to the disk radial direction line CL passing through the center C3 of the disk rotor 2 and the center axis C4 (pressing center) of the cylinder hole 3h, and the center of each bolt insertion hole. Are arranged between two disk radial direction lines CL3 and CL4, respectively, more specifically, between the disk radial direction line CL and the disk radial direction line CL3 on the disk delivery side.

  The main body portion 4d and the mounting seat surfaces 4b and 4b are flush with each other due to the bracket fixing portion (not shown) provided on the vehicle body side, and the both mounting seat surfaces 4b. , 4b is formed in a shape that does not protrude from the support arm 4e to the side opposite to the disk rotor. On the other hand, the disk axial dimensions of the acting portion side of the forward braking torque receiving portion 4i, the reverse braking torque receiving portion 4p, and the both abutment seat surfaces 4m and 4n are as follows. The size corresponding to the range in which the back plate 7b of the friction pad 7 on the acting portion side moves in the disk axial direction before reaching the state is set so as to be around the torque receiving portion 4p during reverse braking and both contact The periphery of the seat surfaces 4m and 4n is formed in a state of projecting from the side of the main body 4d of the caliper bracket 4 to the side opposite to the disc rotor from the side opposite to the disc rotor.

  Further, the side of the anti-disk rotor of the support arm 4e arranged on the disk delivery side is flush with the side of the anti-disk rotor of the main body 4d so as to be flush with the side of the anti-disk rotor of the forward braking torque receiving portion 4i. The flat portion 4j around the slide pin holding hole is formed so as to be positioned on the side opposite to the disc rotor, and is also formed to be flush with the side opposite to the disc rotor of the forward braking torque receiving portion 4i. Accordingly, the disc delivery side end of the main body 4d and the opposite side of the support arm 4e on the opposite side of the disc rotor are matched to the amount of protrusion of the reverse braking torque receiving portion 4p on the opposite side of the disc rotor except for the periphery of the mounting seat surface 4b. As a result, the built-up portion 4q is formed, and is flush with the surface of the built-up portion 4q around the opening of the slide pin holding hole 4h at the tip of the support arm, which is a part of the built-up portion 4q. The flat portion is formed by performing flat processing, and only the flat portion 4j for which dimensional accuracy is required for mounting the pin boot 10 is flat processed, and the rest is left as it is. That is, only the mounting seat surfaces 4b and 4b shown in the shaded portion of FIG. 8, the flat surface portion 4j, and the contact surface 4s where the flange portion 6c of the second slide pin 6 to be described later contacts are processed. The skin remains intact. Further, the reverse-braking torque receiving portion 4p projecting to the side opposite to the disc rotor has an inclined surface that gradually becomes thinner from the side opposite to the disc rotor of the built-up portion 4q toward the side opposite to the disc rotor of the body portion 4d. The braking torque received by the torque receiving portion 4p during reverse braking can be satisfactorily transmitted to the main body portion 4d while avoiding interference with the cylinder portion 3i.

  Thus, by providing the reverse braking torque receiving portion 4p on the disk delivery side of the main body portion 4d, the caliper bracket 4 is provided with a reverse braking torque receiving portion on the disk insertion side of the caliper bracket 4. 4 can simplify the shape of the disk feed-in side, and does not bear the braking torque at the time of reverse braking, so that the thickness can be reduced, and the strength on the disk feed-out side on which the built-up portion 4q is formed can be sufficiently increased. The caliper bracket 4 can be reduced in size and weight while being held.

  The first slide pin 5 has a hexagonal tool coupling large-diameter head portion 5a provided at the base end portion, a male screw portion 5b screwed into the female screw hole 3f, and a shaft portion inserted into the slide pin holding hole 4h. 5c, and the second slide pin 6 is provided at the base end, and is provided with a male screw portion 6a that is screwed into the female screw hole 4k, a shaft portion 6b that is inserted into the slide pin holding hole 3g, and the shaft portion 6b. And a male screw portion 6a, and a tool coupling portion 6d formed at the tip of the shaft portion 6b.

  The piston 9 is formed with an annular protrusion 9a that protrudes inward on the inner peripheral wall on the opening side, an opening-side conical surface 9b that gradually increases in diameter from the annular protrusion 9a toward the piston opening end, and an annular protrusion. A bottom-side conical surface 9c is formed which gradually increases in diameter from the portion 9a toward the piston bottom side and continues to the inner peripheral wall of the piston.

  The friction pads 7 and 8 are formed of linings 7 a and 8 a that are in sliding contact with the side surface of the disk rotor 2, and back plates 7 b and 8 b to which the linings 7 a and 8 a are attached. The back plate 7b of the friction pad 7 on the working portion side is provided with ear pieces 7c that abut on the torque receiving portion 4i at the time of forward braking of the caliper bracket 4 on the disk delivery side, and on both side portions on the inner circumference side of the disc. A contact surface 7d that contacts the first pad contact seat surface 4m and a contact surface 7e that contacts the second pad contact seat surface 4n are formed. Further, a torque transmitting portion 7f that protrudes toward the inner peripheral side of the disc and faces the torque receiving portion 4p during reverse braking is formed on the disc feeding side of the contact surface 7e on the disk feeding side. On the back surface of the back plate 7b facing the piston 9, there is formed a caulking protrusion 7g for caulking and fixing the pad hold spring 13. The caulking protrusion 7g is provided at the center of the disk radial direction of the back plate 7b and closer to the disk insertion side than the position corresponding to the piston central axis, and two vertices are arranged inside and outside the disk radial direction, One vertex is arranged on the disk entry side with respect to the two vertices and is formed in a triangular shape.

  The back plate 8b of the friction pad 8 on the reaction portion side is provided with an ear piece 8c that abuts against the forward braking torque receiving portion 4i on the disk delivery side. A caulking projection 8d for fixing the pad spring 14 is provided in the center of the back surface of the back plate 8b facing the reaction force claws 3k, 3k. The caulking projection 8d has a disc feeding side and a disc feeding side. Are formed with protrusions 8e and 8e that are respectively inserted into the through holes 3m and 3m formed in the reaction force claws 3k and 3k.

  The pad hold spring 13 is formed by bending a thin metal plate, and is attached to the back plate 7b by caulking the caulking protrusion 7g, and protrudes in a T shape from the attachment base 13a. The first pad holding pieces 13b, 13b and the second pad holding piece 13c having the same length and the same shape are provided, and the first pad holding pieces 13b, 13b are provided on the outer side and the inner side in the disk radial direction from the mounting base 13a. The second pad holding pieces 13c protrude toward the disk insertion side, and the second pad holding pieces 13c and the first pad holding pieces 13b and 13b are orthogonal to each other.

  Furthermore, the tip sides of the first pad holding pieces 13b, 13b and the second pad holding piece 13c extend toward the piston bottom while gradually expanding toward the piston inner peripheral wall, and contact the piston inner peripheral wall on the tip side. 13 d of engaging parts which contact | connect are formed, respectively, and the front-end | tip part is formed in a taper shape rather than this engaging part 13d, and is bent toward the inner side. The mounting base portion 13a is formed in a circular shape, and a triangular caulking hole portion 13e that can be fitted to the caulking protrusion 7g is formed in the center portion, and the caulking hole portion 13e has a triangular apex, Each of the first pad holding pieces 13b, 13b and the second pad holding piece 13c is formed so as to face the protruding direction.

  The pad spring 14 is formed by bending a thin metal plate, and a base portion 14a fixed to the back plate 8b by caulking the caulking projection 8d, and a disc insertion side and disc rotation from both sides of the base portion 14a. A pair of assembling pieces 14b, 14b that protrude in a straight line with the same length on the outlet side, and elastic pieces 14c, 14c that protrude outward in the radial direction of the disk from the tips of the assembling pieces 14b, 14b, Cutout portions 14d and 14d are formed in the vicinity of the elastic pieces 14c and 14c on the outer side in the radial direction of the assembly pieces 14b and 14b, respectively. Each assembly piece 14b, 14b protrudes from the base portion 14a while being gradually inclined to the opposite disk rotor side, and the distal end side is bent to the disk rotor side to form recesses 3n, 3n formed in the reaction force claws 3k, 3k. Elastic contact portions 14e and 14e that are elastically contacted are formed, and the front end side of the elastic contact portions 14e and 14e is slightly bent toward the anti-disk rotor side.

  The disc brake 1 formed in this way is assembled to the vehicle body by inserting the caulking hole portion 13e of the pad hold spring 13 into the caulking projection 7g provided on the back plate 7b of the friction pad 7 on the working portion side. With the first pad holding pieces 13b, 13b inward and outward in the disk radial direction and the second pad holding pieces 13c facing the disk insertion side, the caulking protrusion 7g is caulked, and a pad hold spring is applied to the back plate 7b. 13 is fixed. Next, the first pad holding pieces 13 b and 13 b and the second pad holding piece 13 c of the pad hold spring 13 are inserted from the opening side of the piston 9 inserted into the cylinder hole 3 h of the caliper body 3 into the piston 9. . The first pad holding pieces 13b, 13b and the second pad holding piece 13c are inserted into the piston while being bent along the opening-side conical surface 9b and the bottom-side conical surface 9c. It gets over the portion 9a and engages with the piston bottom side of the annular protrusion 9a. As a result, the piston 9 and the friction pad 7 on the action part side are connected via the pad hold spring 13.

  Further, the caulking hole 14f of the pad spring 14 is inserted into the central caulking protrusion 8d formed on the back plate 8b of the friction pad 8 on the reaction part side, and the assembling pieces 14b and 14b and the elastic pieces 14c and 14c are inserted. And the pad spring 14 is fixed to the back plate 8b by caulking the caulking projection 8d. The friction pad 8 is placed on the disk rotor side of the reaction force claws 3k, 3k, and the assembly pieces 14b, 14b and the elastic pieces 14c, 14c of the pad spring 14 are placed on the reaction disk claws 3k, 3k on the opposite disk rotor side. The pad spring 14 together with the friction pad 8 is inserted from the front end of the reaction force claws 3k, 3k to the outer peripheral side of the disk. The pad spring 14 is inserted into the recesses 3n and 3n while the elastic pieces 14c and 14c and the distal end sides of the assembled pieces 14b and 14b are deformed while the assembled pieces 14b and 14b are deformed. As a result, the friction pad 8 is pulled toward the reaction force claws 3k, 3k, and the friction pad 8 on the reaction portion side is connected to the reaction force claws 3k, 3k via the pad spring 14.

  Further, the tool is coupled to the tool coupling portion 6d of the second slide pin 6, the male screw portion 6a is screwed into the female screw hole 4k of the slide pin mounting portion 4g provided in the caliper bracket 4, and the second slide pin 6 is Project to the side opposite to the disc rotor. The slide pin holding hole 3g of the caliper body 3 is inserted into the protruding shaft portion 6b of the second slide pin 6, and the caliper body 3 is rotated with the second slide pin 6 as a fulcrum, so that the friction pads 7, 8 are moved. Arranged on both sides of the disk rotor 2. The positions of the female screw hole 3f of the caliper body 3 and the slide pin holding hole 4h of the caliper bracket 4 are aligned, the first slide pin 5 is inserted from the female screw hole 3f side, and the shaft portion 5c is inserted into the slide pin holding hole 4h. The caliper body 3 is connected to the caliper bracket 4 via the first slide pin 5 and the second slide pin 6 by coupling the tool to the large-diameter head 5a for tool fastening and screwing the male screw portion 5b into the female screw hole 3f. Is attached to be movable in the disk axial direction.

  The caliper bracket 4 assembled with the caliper body 3 is assembled to the vehicle body with the second slide pin 6 side facing upward and the first slide pin 5 side facing downward, and the contact surface of the friction pad 7 on the action portion side 7d and 7e abut against the first pad abutment seat surface 4m and the second pad abutment seat surface 4n, respectively, and the ear pieces 7c and 8c of the friction pads 7 and 8 respectively abut against the torque receiving portion 4i during forward braking. In this state, the torque transmitting portion 7f is opposed to the reverse braking torque receiving portion 4p.

  In the disc brake 1 assembled in this way, when the pressurized hydraulic fluid is supplied to the hydraulic pressure chamber 12 during braking when the vehicle moves forward, the piston 9 moves in the cylinder opening direction while deforming the piston seal 11b. Then, the friction pad 7 on the action portion 3 a side is pushed toward the disk rotor 2, and the lining 7 a of the friction pad 7 is pressed against one side surface of the disk rotor 2. Due to this reaction force, the caliper body 3 is moved in the direction of the action portion 3a by the guidance of the first slide pin 5 and the second slide pin 6, and the friction pad 8 on the reaction portion side is integrated with the reaction force claws 3k, 3k. Slide toward the disk rotor 2 and press the lining 8 a of the friction pad 8 against the other side of the disk rotor 2. At this time, the friction pads 7 and 8 can receive the braking torque satisfactorily at the forward braking torque receiving portion 4i by the ear pieces 7c and 8c being pressed against the forward braking torque receiving portion 4i, respectively.

  Further, during braking when the vehicle is moving backward, the pressurized hydraulic fluid is supplied to the hydraulic pressure chamber 12 as in the case of forward traveling of the vehicle, whereby the lining 7a of the friction pad 7 on the side of the action portion 3a is attached to one of the disk rotors 2. The lining 8a of the friction pad 8 on the reaction part side is pressed against the other side of the disk rotor 2 to the side. At this time, the friction pad 7 on the action part side is in contact with the torque receiving part 4p at the time of reverse braking, and the friction pad 8 on the reaction part side is the disk rotation of the through holes 3m and 3m. By coming into contact with the inner peripheral surface of the entry side, the braking torque at the time of braking at the time of reverse can be favorably received by the torque receiving portion 4p at the time of reverse braking and the through holes 3m, 3m.

  Further, when the brake is released, the piston 9 is retracted toward the bottom of the cylinder hole 3h by the restoring force of the piston seal 11b, and accordingly, the first pad holding pieces 13b and 13b and the second pad holding pieces of the pad hold spring 13 are used. The friction pad 7 on the action side connected to the piston 9 via 13c is forcibly pulled back from one side surface of the disk rotor 2. Further, the friction pad 8 on the reaction portion side is slid integrally with the reaction force claws 3 k, 3 k to the counter disk rotor side by the pad spring 14, and is forcibly pulled back from the other side surface of the disk rotor 2.

  The present embodiment is formed as described above, and the caliper bracket 4 is built up on the opposite side of the disc rotor of the support arm 4e excluding the mounting seat surface 4b in accordance with the protruding amount of the torque receiving portion 7f for reverse braking. The built-up portion 4q is provided, and the main body portion 4d between the mounting seat surfaces 4b and 4b is formed in a shape that does not protrude from the mounting seat surface 4b to the side opposite to the disc rotor. The rigidity of the torque receiving portion 4p at the time of braking can be ensured, the shape of the disk insertion side in the caliper bracket 4 without the torque receiving portion can be simplified and the thickness can be reduced, and the caliper bracket 4 can be reduced in size and weight. can do. Further, when the friction pad 7 on the action part side is in a new state, the built-up part 4q is located on the side opposite to the disc rotor from the position where the reverse braking torque receiving part 4p supports the back plate 4b of the friction pad 7. By forming so as to protrude, the rigidity of the caliper bracket 4 on the disk delivery side can be reliably improved. Further, the reverse braking torque receiving portion 4p is formed by the inclined surface 4r in which the disk insertion side at the time of vehicle advancement of the protruding portion protruding to the side opposite to the disk rotor gradually becomes thinner toward the disk insertion side. Thus, the braking torque received by the reverse braking torque receiving portion 4p can be satisfactorily transmitted to the main body portion 4d while avoiding interference with the cylinder portion 3i. Furthermore, when forming the caliper bracket 4 by casting, by forming the portion for processing the flat portion 4j and the built-up portion 4q so that the portion of the flat portion 4j is slightly thicker, Planar processing of the flat portion 4j after casting can be easily performed, and the built-up portion 4q can be formed to the maximum thickness while avoiding interference with other members. Moreover, the increase in a processing man-hour can be suppressed by leaving the part except the plane part 4j as a casting surface.

  The present invention has a structure in which the second slide pin is provided on the disk entry side and the first torque receiving part and the reverse braking torque receiving part are arranged on the disk delivery side of the caliper bracket as in the above-described embodiment. The present invention is not limited to this, and a structure in which the second slide pin is provided on the disk delivery side, and the first torque receiving part and the reverse braking torque receiving part are disposed on the disk delivery side of the caliper bracket may be used. Further, both slide pins may have a first slide pin structure or a second slide pin structure. Further, the structure of the pad hold spring is not limited to the above-described embodiment, and any structure can be used as long as it can removably connect the friction pad and the piston on the action side, Further, the pad hold spring can be omitted. Further, the shape of the pad spring is arbitrary, and the friction pad on the reaction portion side and the reaction force claw need not be connected by the pad spring, and the shape of the friction pad and the number of pistons are also arbitrary. In addition, the tool coupling portion provided on the second slide pin may have any shape as long as it is provided inside the outer periphery of the second slide pin.

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper body, 3a ... Action part, 3b ... Reaction part, 3c ... Bridge part, 3d, 3e ... Pin support arm, 3f ... Female screw hole, 3g ... Slide pin holding hole, 3h ... Cylinder hole, 3i ... Cylinder part, 3j ... Gap part, 3k ... Reaction force claw, 3m ... Through hole, 3n ... Recess, 4 ... Caliper bracket, 4a ... Bolt insertion hole, 4b ... Mounting seat surface, 4c ... Car body Mounting portion, 4d ... main body portion, 4e ... support arm, 4f ... slide pin holding portion, 4g ... slide pin mounting portion, 4h ... slide pin holding hole, 4i ... forward braking torque receiving portion, 4j ... planar portion, 4k ... Female screw hole, 4m ... first pad contact seat surface, 4n ... second pad contact seat surface, 4p ... torque receiving torque receiving portion, 4q ... overlaying portion, 4r ... inclined surface, 5 ... first slide pin, 5a ... large diameter head for fastening the tool, b ... male screw portion, 5c ... shaft portion, 6 ... second slide pin, 6a ... male screw portion, 6b ... shaft portion, 6c ... flange portion, 6d ... tool coupling portion, 7, 8 ... friction pad, 7a, 8a ... lining 7b, 8b ... back plate, 7c, 8c ... ear piece, 7d, 7e ... contact surface, 7f ... torque transmission part, 7g, 8d ... caulking projection, 8e ... projection, 9 ... piston, 9a ... annular projection 9b ... Open side conical surface, 9c ... Bottom side conical surface, 10 ... Pin boot, 11a ... Dust boot, 11b ... Piston seal, 12 ... Hydraulic chamber, 13 ... Pad hold spring, 13a ... Mounting base, 13b ... No. 1 pad holding piece, 13c ... second pad holding piece, 13d ... engagement portion, 13e ... caulking hole, 14 ... pad spring, 14a ... base, 14b ... assembly piece, 14c ... ballistic piece, 14d ... cut Insertion part, 14e ... Elastic contact part, 1 f ... caulking hole

Claims (5)

A bridge part connects an action part that is arranged on one side of the disk rotor and has a cylinder part that accommodates a piston, and a reaction part that is arranged on the other side of the disk rotor and has reaction force claws. A caliper body is formed, and the caliper body is arranged on a caliper bracket fixed to the vehicle body on one side of the disc rotor, on each of a disc feed-out side and a disc feed-in side when the cylinder moves forward in the vehicle. A pair of slide pins and a pair of slide pin holding holes into which the slide pins are inserted so as to be movable in the axial direction. In the vehicle disc brake in which the friction pads are respectively disposed on the reaction portion side, the caliper bracket is provided with the vehicle body mounting bolt. A main body provided with a vehicle body mounting portion having a bolt insertion hole and a mounting seat surface on the disk introduction side and the disk delivery side when the vehicle is moving forward, and the outer periphery side of the disk from the vehicle body attachment portion on the disk delivery side A support arm projecting from the tip of the support arm, and a slide pin holding unit that projects from the tip of the support arm to the disk delivery side of the bridge when the vehicle moves forward, and straddles the outer periphery of the disk rotor. A reverse braking torque receiving portion that abuts against the friction pad on the acting portion side during vehicle reverse braking and receives braking torque is formed so as to protrude from the mounting seat surface to the side opposite to the disc rotor, and the mounting seat surface A vehicular disc brake characterized in that a build-up portion that is built up in accordance with the protruding amount of the reverse braking torque receiving portion is provided on the opposite side of the support arm to the disc rotor side. The build-up portion is formed so as to protrude to the side opposite to the disc rotor from the position where the torque receiving portion during reverse braking supports the friction pad when the friction pad on the action portion side is in a new state. The vehicle disc brake according to claim 1. The reverse braking torque receiving portion is formed by an inclined surface in which the disk insertion side when the vehicle moves forward of the protruding portion protruding to the side opposite to the disk rotor gradually becomes thinner toward the disk insertion side. The disc brake for vehicles according to claim 1 or 2. The slide pin holding portion is formed with a slide pin holding hole that opens on the side opposite to the disk rotor of the tip end of the support arm, and a slide pin holding hole at the tip end of the support arm that is a part of the build-up portion. The vehicular disc brake according to any one of claims 1 and 3, wherein a flat portion is formed around the opening so as to be flush with a surface of the build-up portion. The caliper bracket is formed by casting, and on the surface of the build-up portion, only the flat portion is flattened, and the surfaces of the other build-up portions are in a state of being cast. Item 5. The vehicle disc brake according to Item 4.

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