JP2007085427A - Pin-slide type disk brake for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a caliper support arms of a caliper bracket from deforming when braking with a simple structure, to always supply stable braking force and to reduce weight and size of a disk brake. <P>SOLUTION: Reinforcing arms 6c, 6c are respectively extended from protruding side ends of the caliper support arms 6b, 6b of the caliper bracket 6 toward disk inner circumference sides of reaction force claws 2f, 2f of a caliper body 2. Tip end parts of the reinforcing arms 6c, 6c and disk inner circumference side end parts of the reaction claws 2f, 2f are engaged in a states slidable to a disk axis direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pin slide type vehicle disc brake used in various traveling vehicles such as automobiles, and more specifically, a disc in which a caliper body is slidably supported in a disc axial direction via a slide pin on a caliper bracket on a vehicle body side. It relates to the structure of the brake.

A caliper body in which a working portion having a piston and a reaction portion having a reaction force claw are connected by a bridge portion is connected to a caliper bracket fixed to the vehicle body at one side of the disc rotor via a slide pin. The caliper bracket includes a pair of caliper support arms that protrude from both sides of the bridge portion in the circumferential direction of the disk and straddle the outer side of the disk rotor in the axial direction of the disk. In a pin slide type vehicle disc brake provided with a torque receiving portion that receives a braking torque by contacting a friction pad, both calipers are used to prevent the caliper support arm of the caliper bracket from being deformed by the braking torque applied during braking. There is one in which a tie bar connecting support arms is constructed so as to surround a reaction force claw provided in a reaction part. In addition, in the case where the tie bar is provided in this manner, the weight is increased and the caliper body is enlarged, so that a pair of projecting portions are provided to face each other from each caliper support arm, and the tip of the projecting portion is engaged. In addition to forming a stopper, a hook piece for holding the locking portion is formed on the back plate of the friction pad, and the caliper support arm is deformed during braking by engaging the hook piece and the locking portion. There is one that prevents this (for example, see Patent Document 1).
JP 2002-295538 A

  However, in the above-mentioned Patent Document 1, the structure of the caliper support arm and the friction pad is complicated, resulting in problems that the productivity of the friction pad is deteriorated and the cost is increased.

  Therefore, the present invention provides a pin slide type vehicle that has a simple structure, prevents the caliper support arm of the caliper bracket from being deformed during braking, can always supply a stable braking force, and can be reduced in size and weight. It aims to provide a disc brake.

  In order to achieve the above object, the first invention provides a reaction portion having a piston disposed on one side portion of the disk rotor and a reaction force claw disposed on the other side portion of the disk rotor. The caliper body, which is connected with the bridge portion, is supported by a caliper bracket fixed to the vehicle body on one side of the disc rotor so as to be movable in the axial direction of the disc via a slide pin, and reacts with the action portion. A pair of friction pads are disposed opposite to each other with the disk rotor interposed therebetween, and the caliper bracket includes a bracket body that connects the working portions of the caliper body, and the bracket body from the bracket body. A pair of caliper support arms projecting on both sides of the disk rotor and straddling the outer side of the disk rotor in the disk axial direction, the caliper support arms being in contact with the friction pads In a pin slide type vehicle disc brake provided with a torque receiving portion for receiving a braking torque, a reinforcing arm is extended from the protruding side end of the caliper support arm toward the disc inner periphery of the reaction force claw, and the reinforcing The distal end of the arm and the end of the reaction force claw on the inner side of the disc are engaged in a slidable state in the disc axial direction.

  In the second invention, the reinforcing arm is engaged with the reaction force claw so that it does not protrude to the counter disk rotor side than the reaction force claw in a state where the action portion is closest to the disk rotor. It is characterized by being.

  In a third aspect of the invention, a retainer is interposed between the disk inner peripheral end of the reaction force claw and the tip of the reinforcing arm.

  By configuring as described above, in the first invention, in an initial state where the braking torque when the brake is operated is small, the caliper body is slidable, and the caliper support arm is controlled by the braking torque during braking. When a force in the opening direction is applied, the end of the reinforcing arm and the inner peripheral end of the reaction force claw engage with each other to suppress the opening, thereby preventing the caliper support arm from being deformed. It is possible to always obtain a stable braking force.

  In the second invention, since the reinforcing arm of the caliper bracket does not protrude from the reaction force claw, the space can be saved, the disc brake can be reduced in size and weight, and the wheel mounted on the vehicle. The selection range of can also be expanded.

  In the third invention, the slideability of the caliper body in the disk axial direction can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a front view of a disc brake, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a plan view of the disc brake, and FIG. FIG. 3 is a perspective view of a disc brake. An arrow A in the figure indicates the rotational direction of the disc rotor during forward traveling of the vehicle, and the disc brake turn-in side and the outlet side used in the following description are for forward travel of the vehicle.

  The caliper body 2 of the disc brake 1 is formed by connecting an action portion 2 a and a reaction portion 2 b disposed opposite to both sides of the disc rotor 3 by a bridge portion 2 c that straddles the outer periphery of the disc rotor 3. Pin support arms 2d and 2d project from the disk entrance side and the exit side of the action portion 2a, and slide pins 4 and 4 are attached to the pin support arms 2d and 2d by bolts 5 and 5, respectively. Is supported by a caliper bracket 6 fixed to the vehicle body on the working portion side of the disk rotor 3 through slide pins 4 and 4 so as to be slidable in the disk axial direction.

  A cylinder hole 2e is formed in the action part 2a, and a cup-shaped piston 7 is inserted into the cylinder hole 2e through a square seal 8 so as to be movable. A hydraulic chamber 9 is defined between each cylinder hole 2e and the bottom of each piston 7, and a union hole 10 communicating with the hydraulic chamber 9 is opened in the bottom wall of the cylinder hole 2e.

  The reaction portion 2b is provided with reaction force claws 2f and 2f extending toward the inner periphery of the disk on the disk insertion side and the discharge side, and the reaction force claws 2f and 2f are provided at the inner periphery side ends of the disk. The engaging recesses 2g and 2g are formed to open to the inner peripheral side of the disk. A pair of friction pads 11 and 11 are disposed opposite to each other with the disc rotor 3 interposed between the reaction portion 2 b and the piston 7 inside the bridge portion 2 c.

  The caliper bracket 6 includes a substantially U-shaped main body portion 6a fixed to the vehicle body on the working portion side of the disc rotor 3, and a disc insertion side on the side of the bridge portion 2c from both ends of the main body portion 6a. A pair of caliper support arms 6b, 6b projecting toward the unwinding side and straddling the outer periphery of the disk rotor 3, and the projecting side ends of the caliper support arms 6b, 6b are directed toward the inner circumference side of the reaction force claws 2f, 2f. Reinforcing arms 6c, 6c are provided. The caliper support arms 6b and 6b are respectively provided with bottomed pin insertion holes 6d and 6d that open to the action portion side, and the slide pins 4 and 4 are inserted into the pin insertion holes 6d and 6d. In addition, U-shaped torque receiving recesses 6f and 6f having torque receiving portions 6e and 6e are formed on the opposing surfaces of the caliper support arms 6b and 6b.

  Reinforcing arms 6c, 6c are formed with engaging projections 6g, 6g accommodated in the engaging recesses 2g, 2g of the reaction force claws 2f, 2f at the tip, and the engaging recesses 2g, 2g and the engaging recesses A slight gap is formed between the engaging projections 6g and 6g accommodated in 2g and 2g. In addition, the reinforcing arm 6c is configured such that the engaging recesses 2g and 2g and the engaging protrusions 6g and 6g are kept engaged while the action portion 2a is closest to the disk rotor 3 during braking, while the reaction force claw 2f It is formed so as to be disposed closer to the disk rotor than the portion P1 that protrudes most toward the opposite disk rotor.

  Each friction pad 11 includes a lining 11a that is in sliding contact with the side surface of the disk rotor 3, and a back plate 11b that holds the lining 11a. Ear pieces 11c and 11c are projected from both sides of the back plate 11b. The friction pads 11 are respectively held on the working portion side or the reaction portion side of the disc rotor 3 by the ear pieces 11c and 11c in the torque receiving recesses 6f and 6f of the caliper support arms 6b and 6b via the retainer and pad springs 12, respectively. ing.

  In the disc brake 1 configured as described above, the hydraulic fluid boosted by a hydraulic master cylinder (not shown) is supplied to the hydraulic chamber 9, and the piston 7 moves forward toward the disc rotor 3. 11 is pressed against one side of the disk rotor 3. Next, the caliper body 2 is guided by the slide pins 4 and 4 by the reaction of the pressing force and moves in the direction of the action portion, and the reaction force claws 2f and 2f move the friction pad 11 on the reaction portion side to the other side of the disc rotor 3. The braking action is performed by pressing. At this time, since gaps are formed between the engagement concave portions 2g, 2g of the reaction force claws 2f, 2f and the engagement convex portions 6g, 6g of the reinforcing arms 6c, 6c, the engagement concave portions 2g, 2g By sliding in the axial direction of the disk along the engaging projections 6g, 6g, the friction pad 11 on the reaction part side can be pressed against the disk rotor 3 in a good state.

  During the braking operation, the friction pad 11 is dragged to the disk delivery side by the sliding contact between the disk rotor 3 and the friction pad 11, and the ear piece 11c comes into contact with the torque receiving portion 6e on the disk delivery side, and the torque When braking torque is applied to the receiving portion 6e, a force in the opening direction acts on the caliper support arm 6b on the disk delivery side, but with the deformation of the caliper support arm 6b, the engagement recess 2g of the reaction force claw 2f Since the engaging projection 6g of the reinforcing arm 6c abuts and the reaction force claw 2f suppresses deformation of the caliper support arm 6b, a stable braking force can always be provided.

  Further, the reinforcing arm 6c maintains the engagement state between the engagement recesses 2g and 2g and the engagement protrusions 6g and 6g in a state where the action portion 2a is closest to the disk rotor 3, while the reaction force claw 2f The length of the caliper bracket 6 in the disc axial direction can be reduced because the portion P1 is formed so as to be disposed closer to the disc rotor than the portion P1 that projects most to the disc rotor. As a result, space can be saved, the range of wheels to be mounted on the vehicle can be increased, and the size of the wheel can be reduced compared to a conventional disc brake with a tie bar while suppressing deformation of the caliper support arm 6b.・ Weight reduction can be achieved.

  FIG. 5 is a front view of a disc brake showing a second embodiment of the present invention. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the retainers 20 and 20 are attached to the engaging projections 6g and 6g of the reinforcing arms 6c and 6c. Each retainer 20 is formed of a metal thin plate, and the retainer portion 20a that covers the contact surface of the engaging convex portion 6g with the engaging concave portion 2g and the distal end surface, and the retainer portion 20a are connected to the engaging portion 6g. A plurality of locking pieces 20b to be locked to the joint convex portion 6g and the front end surface of the reinforcing arm 6c are provided. As described above, the retainer 20 is interposed between the engaging convex portion 6g and the engaging concave portion 2g, so that the sliding property of the caliper body 2 in the disc axial direction can be improved.

  The present invention is not limited to the one-pot pin slide type disc brake as in each of the embodiments described above, but can be applied to a multi-pot pin slide type disc brake. In the case where three or more are formed, the engaging portion with the reinforcing arm may be formed on two reaction force claws on both sides of the disk in the circumferential direction. In addition, it is possible to provide an engagement convex portion on the reaction force claw and an engagement concave portion that engages the engagement convex portion on the reinforcing arm. Further, a step portion is formed on the reaction force claw, and the step is formed on the reinforcing arm. An engagement convex portion that engages with the portion may be provided. Further, a reinforcement arm may be formed only on the caliper support arm on the disk delivery side, and the reinforcement arm and the reaction force claw on the disk delivery side may be engaged in a slidable state in the disk axial direction.

1 is a front view of a disc brake showing a first embodiment of the present invention. It is II-II sectional drawing of FIG. It is a top view of a disk brake similarly. It is a perspective view of a disk brake similarly. It is a front view of the disc brake which shows the 2nd example of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Caliper body, 2a ... Action part, 2b ... Reaction part, 2c ... Bridge part, 2d ... Pin support arm, 2e ... Cylinder hole, 2f ... Reaction force claw, 2g ... Engagement recessed part, 3 ... Disc rotor, 4 ... slide pin, 5 ... bolt, 6 ... caliper bracket, 6a ... main body, 6b ... caliper support arm, 6c ... reinforcing arm, 6d ... pin insertion hole, 6e ... torque receiving portion, 6f ... torque receiving recess , 6g ... engaging convex part, 7 ... piston, 8 ... square seal, 9 ... hydraulic chamber, 10 ... union hole, 11 ... friction pad, 11a ... lining, 11b ... back plate, 11c ... ear piece, 12 ... retainer Also a pad spring, 20 ... Retainer, 20a ... Retainer part, 20b ... Locking piece

Claims (3)

A caliper body in which a working portion having a piston disposed on one side of the disk rotor and a reaction portion having a reaction force claw disposed on the other side of the disk rotor are connected by a bridge portion; One side of the disk rotor is supported by a caliper bracket fixed to the vehicle body so as to be movable in the disk axial direction via a slide pin, and a pair of the disk rotor is sandwiched between the action part and the reaction part. The caliper bracket has a bracket main body that connects the working portions of the caliper body, and protrudes from the bracket main body to both sides in the disk circumferential direction of the bridge portion so that the outer side of the disk rotor extends outside the disk shaft. A pair of caliper support arms straddling in a direction, and the caliper support arm is provided with a torque receiving portion that receives the braking torque in contact with the friction pad In the non-sliding type vehicle disc brake, a reinforcing arm is extended from the protruding side end of the caliper support arm toward the inner peripheral side of the disk of the reaction force claw, and the tip of the reinforcement arm and the reaction force claw A pin slide type vehicle disc brake characterized in that a disc inner peripheral side end portion is engaged in a slidable state in the disc axial direction. The reinforcing arm is formed so as not to protrude from the reaction force claw to the side opposite to the disk rotor while the action portion is closest to the disk rotor. The pin slide type vehicle disc brake according to claim 1. The pin slide type vehicle disk brake according to claim 1 or 2, wherein a retainer is interposed between an inner circumferential end of the reaction force claw and a tip of the reinforcing arm.

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