JP2010185500A - Caliper body for vehicular disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caliper body for a dual line type vehicular disk brake in a simple structure, capable of reducing its size. <P>SOLUTION: This caliper body 6 for the dual line type vehicular disk brake 1 is arranged with the second brake line cylinder hole 10 while being offset to a disk radial-directional outside from the first brake line cylinder holes 9, 11 located on both sides of the hole 10. A piston seal groove fitted thereinto with a piston seal is formed in each of the cylinder holes, and the disk circumferential-directional adjacent piston seal grooves are formed with shift in a disk axial direction, and are formed overlappedly in a disk circumferential direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a caliper body for a vehicle disc brake mounted on a vehicle such as a four-wheeled vehicle or a motorcycle, and more specifically, a plurality of cylinder holes provided in an action part are divided into two hydraulic systems. The present invention relates to a caliper body for a two-system pin slide type vehicle disc brake.

  In a multi-pot caliper body, the centers of the plurality of cylinder holes are usually arranged at equal distances from the center of the disk rotor (see, for example, Patent Document 1). Further, in a two-system caliper body in which a plurality of cylinder holes are divided into two hydraulic systems, a first fluid passage for supplying hydraulic fluid to a piston inserted into the first brake system cylinder hole, and a second brake There is one in which a second liquid passage for supplying hydraulic fluid to a piston inserted in a system cylinder hole is formed by linearly drilling (for example, see Patent Document 2).

JP-A-5-288229 JP 2006-153264 A

  However, in the caliper body disclosed in Patent Document 1 described above, the center of the plurality of cylinder holes is arranged at an equal distance from the center of the disk rotor, so the length of the caliper body in the disk circumferential direction is increased. It was. Patent Document 2 discloses that the center of a plurality of cylinder holes is not equidistant from the center of the disk rotor, but the interval between adjacent cylinder holes is such that the piston seal groove is in the disk circumferential direction. Therefore, the length of the caliper body in the circumferential direction of the disk could not be shortened.

  In addition, when the liquid passage connecting the cylinder holes on both sides of the disk circumferentially is formed so as to bypass the circumference of the central cylinder hole, the caliper body is enlarged in the radial direction of the disk, while the bottom of the central cylinder hole is When formed so as to be detoured, the caliper body is enlarged in the disk axial direction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a caliper body for a two-system vehicle disc brake that can be reduced in size with a simple structure.

  In order to achieve the above object, a caliper body of a vehicle disc brake according to the present invention has three or more cylinder holes arranged in parallel in the circumferential direction of the disc in an action portion disposed on a side portion of the disc rotor. The cylinder holes for the first brake system are the cylinder holes for the first brake system, the other cylinder holes are the cylinder holes for the second brake system, and at least one cylinder hole for the second brake system is the two cylinder holes for the first brake system. The piston inserted in the cylinder hole for the first brake system is operated by the hydraulic fluid supplied through the first fluid passage, and is inserted in the cylinder hole for the second brake system. In the caliper body of a two-system vehicle disc brake that operates with hydraulic fluid supplied through the second fluid passage. Piston seals are arranged adjacent to each other in the circumferential direction of the disk by disposing cylinder holes offset from the first brake system cylinder holes in the disk radial direction, and forming piston seal grooves in the respective cylinder holes. The grooves are formed so as to be shifted in the disk axial direction and overlapped in the disk circumferential direction.

  Further, the communication path connecting the plurality of cylinder holes of the first liquid passage is an inner side in the disk radial direction of the second brake system cylinder hole, and an inner end in the disk radial direction of the plurality of first brake system cylinder holes. It is preferable to provide a straight line on the outer side in the disk radial direction with respect to a virtual line that connects the two lines in a straight line. Further, the caliper body is supported by a caliper bracket attached to the vehicle body so as to be movable in the disk axial direction through a pair of sliding pins provided on the disk delivery side and the disk inner peripheral side when the vehicle moves forward. The disk inner peripheral sliding pin is an imaginary line that linearly connects the inner ends in the disk radial direction of the cylinder portion having the plurality of first brake system cylinder holes in the cross section of the sliding pin. It is preferable to be arranged on the outer side in the radial direction of the disk with respect to the position passing through or the virtual line.

  According to the caliper body of the vehicle disc brake of the present invention, the cylinder hole for the second brake system is arranged offset to the outside in the radial direction of the disc from the cylinder hole for the first brake system, and the cylinder hole adjacent in the circumferential direction of the disc. The piston seal groove is shifted in the axial direction of the disc and overlapped in the circumferential direction of the disc, so that the caliper body can be shortened in the circumferential direction of the disc and the caliper body can be downsized. Can be planned.

  Further, by forming the second brake system cylinder hole on the outer side in the disk radial direction, the communication path connecting the plurality of first brake system cylinder holes on the inner side in the disk radial direction of the second brake system cylinder hole, The caliper body is arranged in the disk radial direction or the disk in order to provide the communication path by providing the plurality of first brake system cylinder holes linearly outside the imaginary line connecting the inner ends in the disk radial direction in the disk radial direction. An increase in size in the axial direction can be prevented.

  Further, the sliding pin provided on the inner side in the circumferential direction of the disc for attaching the caliper body to the caliper bracket has a disc radius of a cylinder portion provided with the plurality of first brake system cylinder holes in the cross section of the sliding pin. The caliper body can be further reduced in size by being disposed at a position where a virtual line connecting the inner ends in the direction of a straight line passes or at the outer side in the disk radial direction.

It is II sectional drawing of FIG. It is II-II sectional drawing of FIG. 1 is a front view of a vehicle disc brake showing an embodiment of the present invention. It is a top view of the disk brake for vehicles similarly. FIG. 5 is a VV cross-sectional view of FIG. 3. It is VI-VI sectional drawing of FIG. It is a system diagram of a brake device.

  The disc brake 1 according to this embodiment is used for a front brake of a motorcycle, and includes a caliper bracket 3 fixed to a vehicle body on one side of the disc rotor 2, and a pair of sliding pins 4 and 5 on the caliper bracket 3. And a pair of friction pads 7 and 8 disposed opposite to both sides of the disk rotor 2. An arrow A indicates the direction of rotation of the disc rotor 2 that rotates integrally with the front wheels when the vehicle moves forward, and the disk unloading side and the disk loading side described below are those when the vehicle moves forward.

  The caliper body 6 includes an action portion 6a and a reaction portion 6b disposed on both sides of the disc rotor 2, and a bridge portion 6c that connects the action portion 6a and the reaction portion 6b across the outer periphery of the disc rotor 2. The three cylinder holes 9, 10, 11 formed in the action portion 6a are divided into two hydraulic systems and are configured as a three-pot two-system system. The cylinder holes 9, 10, and 11 are arranged in parallel in the action portion 6a so as to open the disk rotor side, and four reaction force claws 6d are formed in the reaction portion 6b. Guide arms 6e and 6e of the hanger pins 12 that suspend the friction pads 7 and 8 project from the disk rotor return side of the action part 6a and the reaction part 6b. On the side, mounting arms 6f and 6g of the sliding pins 4 and 5 are extended.

  The cylinder holes 9, 10, and 11 are formed such that the cylinder hole 9 on the disk delivery side and the cylinder hole 11 on the disk introduction side are formed on the inner side in the disk radial direction, and the central cylinder hole 10 is formed on the outer side in the disk radial direction. That is, the length L1 from the center P1 of the disc rotor 2 to the center axis C1 of the cylinder hole 9 and the length dimension L2 from the center P1 to the center axis C2 of the cylinder hole 11 are larger than the center hole P10 from the center P1. The length dimension L3 to the central axis C3 is longer. Further, the central cylinder hole 10 and the disk hole 11 on the disk feed side are formed with a small diameter, the cylinder hole 9 on the disk feed side is formed with a large diameter, and the cylinder hole 9 on the disk feed side and the disk feed side are formed. The central cylinder hole 10 is formed deeper than the cylinder hole 9 on the disk delivery side and the cylinder hole 11 on the disk introduction side at the same depth as the cylinder hole 11. A cylinder for the first brake system has a large-diameter cylinder hole 9 formed on the inner side in the disk radial direction on the disk outlet side and a small-diameter cylinder hole 11 formed on the inner side in the disk radial direction on the disk inlet side. A small diameter formed at the center in the circumferential direction of the disk between the cylinder holes 9 and 11 for the first brake system, and deeper than the other two cylinder holes 9 and 11. The cylinder hole 10 is a cylinder hole for the second brake system. The cylinder hole bottom side of the caliper body 6 is formed so that the central cylinder hole 10 is formed outside the other cylinder holes 9 and 11 in the disk radial direction and deeper than the other cylinder holes 9 and 11. Thus, a stepped shape having a protruding portion 6h on the outer side in the disk radial direction of the center portion is formed.

  A large-diameter piston 13 is inserted into the cylinder hole 9 on the disk delivery side via a piston seal 14 and a dust seal 15, and the cylinder hole 11 on the disk delivery side has a small diameter and the same length as the piston 13. The piston 16 is inserted through the piston seal 17 and the dust seal 18. A piston 19 having a small diameter and longer than the pistons 13 and 16 is inserted into the central cylinder hole 10 via a piston seal 20 and a dust seal 21. The piston seals 14, 17, 20 and the dust seals 15, 18, 21 are mounted in piston seal grooves 9a, 10a, 11a and dust seal grooves 9b, 10b, 11b formed in the cylinder holes 9, 10, 11, respectively. The piston seal groove 10a of the central cylinder hole 10 is formed on the side opposite to the disk rotor than the piston seal grooves 9a and 11a of the other two cylinder holes 9 and 11, and is adjacent to the disk circumferential direction. 10a and piston seal grooves 10a and 11a are formed so as to be displaced in the disk axial direction and overlap in the disk circumferential direction. The dust seal grooves 9b, 10b, and 11b are formed shallower than the piston seal grooves 9a, 10a, and 11a, and are formed on the opening side of the cylinder holes 9, 10, and 11, respectively.

  Hydraulic pressure chambers 22a, 22b, and 22c are defined between the pistons 13, 19, and 16 and the cylinder holes 9, 10, and 11, respectively, and the disk delivery side that serves as the cylinder hole for the first brake system. The hydraulic chambers 22 a and 22 c defined between the cylinder holes 9 and 11 on the inlet side and the pistons 13 and 16 are communicated with each other by a communication passage 23 a of the first liquid passage 23.

  A first union boss 6i protrudes outside the action portion 6a in the disk radial direction and on the disk delivery side, and a first bleeder boss 6j protrudes on the disk radial side inside and on the disk delivery side end. A second union boss portion 6k and a second bleeder boss portion 6m protrude from the outer side in the disk radial direction and at the center in the disk circumferential direction.

  The first liquid passage 23 is formed in the first union boss portion 6i and communicates with the cylinder hole 9 on the disk delivery side, and the first liquid passage 23 is formed in the first bleeder boss portion 6j and on the disk delivery side cylinder. The first bleeder hole 6o communicating with the hole 9 and the cylinder hole 9 on the disk delivery side and the cylinder hole 11 on the disk delivery side passing through the inner side in the disk radial direction of the central cylinder hole 10 are connected in a straight line. And a communication passage 23a.

  The communication passage 23a is arranged such that the central cylinder hole 10 is offset from the first brake system cylinder holes 9 and 11 on both sides of the central cylinder hole 10 toward the outer side in the disk radial direction. The disk radius is larger than the imaginary line IL1 that is formed by using a space formed on the inner side in the direction and linearly connects the inner end in the disk radial direction of the cylinder hole 9 on the disk delivery side and the cylinder hole 11 on the disk delivery side. It is formed by drilling linearly outward in the direction. Further, the communication passage 23a and the first bleeder hole 6o are formed in a straight line, and the processing of the communication passage 23a and the first bleeder hole 6o passes through the cylinder hole 13 from the opening of the first bleeder hole 6o to the cylinder. By drilling to the disk delivery side surface of the hole 11, the communication path 23a and the first bleeder hole 6o are drilled at a time. Further, a female thread portion for screwing the bleeder screw 25 into the opening of the first portion bleeder hole 6o is threaded.

  The second liquid passage 24 is formed in the second union boss portion 6k and communicates with the central cylinder hole 10 and is formed in the second bleeder boss portion 6m and communicates with the central cylinder hole 10. And a second bleeder hole 6q. Further, bleeder screws 25 and 26 are screwed into the first bleeder hole 6o and the second bleeder hole 6q, respectively.

  The caliper bracket 3 is a plate-like member that is attached to the bottom case. The caliper bracket 3 is arranged on the disc delivery side of the caliper body 6 and on the disc outer periphery side of the caliper body 6 and the first attachment portion 3a that protrudes toward the outer periphery side of the disc. A second mounting portion 3b is provided, and the sliding pins 4 and 5 project in parallel with the disk shaft on the working portion side of the first mounting portion 3a and the second mounting portion 3b. The sliding pin 4 on the disk delivery side is inserted into the insertion hole formed in the mounting arm 6f on the disk delivery side, and the sliding pin 4 on the inner circumference side of the disk is attached to the mounting arm 6g on the inner circumference side of the disk. The caliper body 6 is inserted through the formed insertion holes, and supported by the slide pins 4 so as to be movable in the disk axial direction.

  The sliding pin 4 on the disk delivery side has a male thread portion inserted through the caliper bracket through-hole from the working portion side of the caliper bracket 3, and the flange portion 4a is brought into contact with the side of the caliper bracket acting portion. The sleeve nut 4 b is screwed onto the male thread portion protruding from the reaction portion to the side of the reaction portion, and the caliper bracket 3 is sandwiched between the sleeve nut 4 b and the flange portion 4 a of the slide pin 4. It protrudes in parallel to the disk axis on the working part side.

  The sliding pin 5 on the inner circumference side of the disk is formed between a shaft portion 5a inserted into the insertion hole of the mounting arm 6g, a male screw 5b used for attachment to the caliper bracket 3, and the male screw 5b and the shaft portion 5a. And a hexagonal nut 5c. In the caliper bracket 3, the male screw 5 b is screwed into the female screw hole of the caliper bracket 3 from the action part side, and the nut 5 c is brought into contact with the side face of the action part of the caliper bracket 3. It protrudes in parallel to the disk axis on the working part side. Further, the sliding pin 5 attached in this way has a cylinder hole 9 on the disk delivery side and a cylinder hole 11 on the disk delivery side inside the cross section of the sliding pin 5. The cylinder portions 6r and 6s are arranged at positions where an imaginary line IL2 that connects the inner ends in the disk radial direction in a straight line passes.

  On the guide arms 6e and 6e, a hanger pin 12 is laid across the outside of the disk rotor 2 in parallel with the disk shaft. The hanger pin 12 suspends the disk insertion side of the friction pads 7 and 8, and the friction. The disk delivery sides of the pads 7 and 8 are supported by a caliper bracket 3 and a sleeve nut 4b, respectively.

  The friction pads 7 and 8 are configured by fixing linings 7a and 8a that are in sliding contact with the side surface of the disk rotor 2 to one side surface of the back plates 7b and 8b. Arm portions 7c and 8c each having a pin insertion hole project therefrom. Torque transmission arms 7d and 8d are provided on the disk delivery side of the back plates 7b and 8b, and a semicircular bifurcated piece 8e is provided at the tip of the torque transmission arm 8d on the reaction portion side. The friction pad 7 on the working part side is suspended by inserting the hanger pin 12 through the hanger pin insertion hole on the disk insertion side, and supports the torque transmission arm 7d on the disk delivery side with the caliper bracket 3 to provide a piston 13. , 16, 19 and one side surface of the disk rotor 2 are disposed so as to be movable in the disk axial direction. Further, the friction pad 8 on the reaction portion side is suspended by the hanger pin 12 being inserted into the hanger pin insertion hole on the disk insertion side, and the sleeve nut is formed by the bifurcated piece 8e at the tip of the torque transmission arm 8d on the disk supply side. 4b is disposed between the reaction force claw 6d and the other side surface of the disk rotor 2 so as to be movable in the disk axial direction.

  The two fluid passages 23, 24 communicate with a known hydraulic master cylinder via a brake hose (not shown) connected to each union hole 6n, 6p. For example, as shown in FIG. The first fluid passage 23 is connected to a first fluid pressure master cylinder 32 that generates fluid pressure by operating the brake lever 31 of the front wheel brake, and the second fluid passage 24 is operated by operating the brake lever 33 of the rear wheel brake. It is connected to a second hydraulic master cylinder 34 that generates hydraulic pressure.

  When the brake lever 31 for the front wheel is operated, the hydraulic pressure generated in the first hydraulic master cylinder 32 is introduced into the hydraulic chambers 22a and 22c by the first hydraulic passage 23, and the pistons 13 and 16 are inserted into the cylinder holes 9 and 11 respectively. Is advanced in the direction of the disc rotor to brake the front wheels. When the rear wheel brake lever 33 is operated, the hydraulic pressure generated in the second hydraulic master cylinder 34 is introduced into the hydraulic chamber 22b by the second hydraulic passage 24, and the piston 19 moves the cylinder hole 10 through the disc rotor. The front wheel is braked by moving forward, and the rear wheel disc brake 35 is operated to brake the rear wheel.

  In this embodiment, as described above, the central cylinder hole 10 disposed between the cylinder holes 9 and 16 on the outer side in the disk circumferential direction is offset to the outer side in the disk radial direction with respect to the cylinder holes 9 and 16 and the adjacent pistons Since the seal grooves 9a and 10a and the piston seal grooves 10a and 11a are formed so as to be shifted in the disk axial direction and overlapped in the disk circumferential direction, the length of the caliper body 6 in the disk circumferential direction is shortened. The caliper body 6 can be downsized.

  Further, the communication passage 23a of the first liquid passage 23 is straight on the inner side in the disk radial direction of the cylinder hole 10 and on the outer side in the disk radial direction with respect to the virtual line IL1 connecting the inner ends of the cylinder holes 9 and 11 in the disk radial direction. Since the caliper body 6 can be prevented from increasing in size in the radial direction of the disk, the number of processing steps for the first liquid passage 23 can be reduced. Further, the sliding pin 5 on the inner circumferential side of the disk has a cylinder in the caliper body 6 that has a cylinder hole 9 on the disk delivery side and a cylinder hole 11 on the disk delivery side inside the cross section of the sliding pin 5. Since the imaginary line IL2 that connects the inner ends in the disk radial direction of the portions 6r and 6s in a straight line is disposed, the mounting arm of the sliding pin 5 protrudes greatly inward in the disk radial direction as in the prior art. The caliper body 6 can be further reduced in size.

  The present invention is not limited to the above-described embodiment, and the disk inner circumferential side sliding pin includes a disk hole on the disk feeding side and a cylinder hole on the disk feeding side. You may arrange | position outside a disk radial direction rather than the virtual line which connects the radial direction inner end linearly. Furthermore, the present invention is not limited to the one provided with three cylinder holes in the action portion, and can also be applied to one provided with four or more cylinder holes. Further, the diameter and depth of the cylinder hole are arbitrary, and the union hole and the bleeder hole may be appropriately formed according to the shape of the cylinder hole or caliper body. Further, the hydraulic master cylinder may be one that generates hydraulic pressure by operating a brake pedal, and pulls connecting means such as a wire by operating a brake operator to generate hydraulic pressure in the hydraulic master cylinder. Things can be used.

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4, 5 ... Sliding pin, 6 ... Caliper body, 6a ... Action part, 6b ... Reaction part, 6c ... Bridge part, 6d ... Reaction force nail, 6e ... guide arms, 6f, 6g ... mounting arms, 6h ... projecting parts, 6i ... first union boss part, 6j ... first bleeder boss part, 6k ... second union boss part, 6m ... second bleeder boss part, 6n ... first Union hole, 6o ... 1st bleeder hole, 6p ... 2nd union hole, 6q ... 2nd bleeder hole, 6r ... Cylinder part, 6s ... Cylinder part, 7, 8 ... Friction pad, 7a, 8a ... Lining, 7b, 8b ... back plate, 7c, 8c ... arm part, 7d, 8d ... torque transmission arm, 8e ... bifurcated piece, 9, 10, 11 ... cylinder hole, 9a, 10a, 11a ... piston seal groove, 9b, 10b, 11b ... dust seal 12 ... Hanger pin, 13, 16, 19 ... Piston, 14, 17, 20 ... Piston seal, 15, 18, 21 ... Dust seal, 22a, 22b, 22c ... Hydraulic chamber, 23 ... First fluid passage, 23a ... Communication path, 24 ... second fluid path, 31, 33 ... brake lever, 32 ... first hydraulic master cylinder, 34 ... second hydraulic master cylinder, 35 ... disc brake

Claims (3)

Three or more cylinder holes are juxtaposed in the circumferential direction of the disk in the action portion arranged on the side of the disk rotor, and at least any two cylinder holes are used as first brake system cylinder holes, and the other cylinder holes are provided. A piston inserted into the first brake system cylinder hole, the second brake system cylinder hole being disposed between at least one second brake system cylinder hole between the two first brake system cylinder holes. Is operated by the hydraulic fluid supplied through the first fluid passage, and the piston inserted into the second brake system cylinder hole is operated by the hydraulic fluid supplied through the second fluid passage. In the caliper body of a system-type vehicle disc brake, the second brake system cylinder hole is located on the outer side in the disk radial direction than the first brake system cylinder hole. A piston seal groove for fitting the piston seal is formed in each cylinder hole, and the piston seal groove adjacent to the disk circumferential direction is formed by shifting it in the disk axial direction, and over the disk circumferential direction. A caliper body for a disc brake for a vehicle characterized by being formed by wrapping. The communication passage that connects the plurality of cylinder holes of the first fluid passage is straight inside the disk radial direction inner end of the plurality of first brake system cylinder holes on the inner side in the disk radial direction of the second brake system cylinder hole. 2. A caliper body for a disk brake for a vehicle according to claim 1, wherein the caliper body is linearly provided on the outer side in the disk radial direction with respect to the imaginary line connected to each other. The caliper body is supported by a caliper bracket attached to the vehicle body so as to be movable in the disk axial direction via a pair of slide pins provided on the disk delivery side and the disk inner peripheral side when the vehicle moves forward. An imaginary line that linearly connects the inner ends in the disk radial direction of the cylinder part having the plurality of first brake system cylinder holes therein passes through the cross section of the sliding pin on the inner peripheral side. The caliper body for a disk brake for a vehicle according to claim 1, wherein the caliper body is disposed on the outer side in the disk radial direction than the position or the imaginary line.

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