JP2007146955A - Caliper body for vehicular disc brake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caliper body with liquid holes easily and accurately machined, having improved productivity and reduced cost. <P>SOLUTION: A first liquid hole 17a passing through one cylinder hole 8 out of a plurality of cylinder holes and a second liquid hole 17b passing through the other cylinder holes 9 cross and communicate each other at their front ends. The first liquid hole 17a and the second liquid hole 17b are formed with its diameter smaller and with its diameter larger, respectively. A first breeder hole 17c and a first union hole 17d are formed in the opening side of the first liquid hole 17a and in the opening side of the second liquid hole 17b, respectively. <P>COPYRIGHT: (C)2007,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 cylinder hole and a cylinder hole formed in an action portion disposed on a side portion of a disc rotor. The caliper body has a first liquid passage hole and a second liquid passage hole that communicate with each other.

  As a caliper body structure provided with a cylinder hole, a first liquid passage hole communicating with the cylinder hole, and a second liquid passage hole in the action portion disposed on the side portion of the disc rotor, A plurality of cylinder holes are provided, and the first liquid passage hole and the second liquid passage hole that pass through the two cylinder holes from the outside of the caliper body and communicate with each other at one location are provided. The opening side of one liquid passage hole There is one in which a union hole is formed and a bleeder hole is formed on the opening side of the other liquid passage hole (see Patent Document 1).

Further, in a two-system caliper body in which the hydraulic pressure path of the caliper body is divided into two, for example, two cylinder holes located on the outer side in the disk circumferential direction out of the three cylinder holes provided in the operating portion For the 1 brake system, the cylinder hole located in the center is for the 2nd brake system. The 1st fluid passage penetrates the inside of the 2 cylinder holes for the 1st brake system from the outside of the caliper body, and crosses and communicates with each other at one place. There is a liquid passage for the first brake system by providing a hole and a second liquid passage hole (see Patent Document 2).
Japanese Utility Model Publication No.59-42328 JP 2003-148524 A

  However, when the liquid passage is formed by intersecting the two liquid passage holes, it takes time to manage the tolerance in order to secure the communication area. On the other hand, if the two liquid passage holes have a large diameter, the communication area can be secured without strict tolerance control, but the caliper body has been enlarged. In particular, if the caliper body is a two-part caliper body with two hydraulic pressure paths and it has three or more cylinder holes, the caliper body can be used at the intersection of the liquid passage holes without increasing the size of the caliper body. In order to secure a large communication area, it is necessary to precisely position the liquid passage hole, and it takes time and effort for the processing.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a caliper body for a vehicle disc brake that can easily and reliably process a fluid passage hole, and that can improve productivity and reduce costs.

  In order to achieve the above object, a first invention is a vehicle disc brake in which a cylinder hole, a first fluid passage hole, and a second fluid passage hole are formed in an action portion disposed on a side portion of the disc rotor. In the caliper body, one of the first liquid passage hole and the second liquid passage hole is formed in communication with the hydraulic chamber of the cylinder hole, and one liquid passage hole and the other liquid passage hole are formed. The front end side of the hole is cross-communicated, and one of the first liquid passage hole and the second liquid passage hole is formed with a small diameter, and the other liquid passage hole is formed with a large diameter. .

  In the second aspect of the invention, the working portion disposed on the side portion of the disk rotor has a plurality of cylinder holes and a first fluid passage hole communicating with the hydraulic chamber of one of the plurality of cylinder holes. And a caliper body of a disc brake for a vehicle having a second fluid passage hole communicating with a fluid pressure chamber of another cylinder hole, the first fluid passage hole and the tip end side of the second fluid passage hole are in cross communication with each other. In addition, one of the first liquid passage hole and the second liquid passage hole has a small diameter, and the other liquid passage hole has a large diameter.

  In the third invention, the communication area of both liquid passage holes is equal to or larger than the cross-sectional area of one liquid passage hole having a small diameter. In the fourth invention, one of the liquid passage holes having a small diameter is provided. A bleeder hole is formed on the opening side of the liquid passage hole, and a union hole is formed on the opening side of the other liquid passage hole having a large diameter.

  As described above, in the first and second inventions, by forming one of the first liquid passage hole and the second liquid passage hole with a small diameter and the other liquid passage hole with a large diameter, For example, if one liquid passage hole having a small diameter is formed toward the other liquid passage hole having a large diameter without precise positioning of both liquid passage holes, the first liquid passage hole and the first liquid passage hole Since the two liquid passage holes can be surely and easily communicated with each other, the work of the liquid passage holes is not troublesome, and the productivity can be improved and the cost can be reduced.

  In the third aspect of the invention, the communication area of both liquid passage holes is equal to or larger than the cross-sectional area of one of the liquid passage holes having a small diameter, so that the flow of hydraulic fluid is not impaired.

  In the fourth invention, since the union hole for supplying the hydraulic fluid to the cylinder hole is formed on the opening side of the liquid passage hole having a large diameter, the hydraulic fluid can be smoothly supplied to the hydraulic chamber. By forming the bleeder holes for releasing air so that the working fluid does not flow so much on the opening side of the liquid passage hole, the liquid passage hole can be formed effectively without increasing the size of the caliper body. Furthermore, since the union hole and the bleeder hole communicate with each other via the large-diameter liquid passage hole and the small-diameter liquid passage hole, it is not necessary to provide a separate communication hole for connecting the cylinder holes, and the processing is facilitated. .

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional front view of the disc brake, and FIG. 2 is a sectional plan view of the disc brake. An arrow A in the figure indicates the direction of rotation of the disc rotor during forward traveling of the vehicle, and the disc rotor turn-in side and the outlet side used in the following description are cases during forward travel of the vehicle.

  A 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 a disc rotor 2 and a pair of sliding pins 4, 4 on the bracket 3. The caliper body 5 is cantilever-supported, and a pair of friction pads 6, 6 are arranged opposite to both sides of the disk rotor 2.

  The caliper body 5 is a three-pot, two-system system in which the three cylinder holes 7, 8, 9 are divided into two hydraulic systems, and includes an action portion 5a and a reaction portion 5b disposed on both sides of the disk rotor 2. The bridge portion 5c straddling the outer periphery of the disk rotor 2 is connected. Mounting arms 5d and 5d project from the action portion 5a, and the caliper body 5 is supported by the slide pins 4 and 4 so as to be movable in the disk axial direction.

  Between the action part 5a and the reaction part 5b, the friction pads 6 and 6 are arranged opposite to each other with the disk rotor 2 interposed therebetween. Each friction pad 6 is formed by joining a lining 6a and a back plate 6b. A hanger pin 10 is suspended from one side of the back plate 6b across the disc rotor 2 on the disc insertion side of the caliper bracket 3. And the other side of the back plate 6b is loosely fitted in a pad guide groove provided on the disk delivery side of the caliper bracket 3, and is suspended so as to be movable in the disk axial direction.

  The action portion 5a is formed with a small-diameter deep bottom cylinder hole 7 at the center, a large-diameter shallow bottom cylinder hole 8 on the disk delivery side, and a small-diameter shallow bottom cylinder hole 9 on the disk delivery side. In these cylinder holes 7, 8, and 9, pistons 11, 12, and 13 having large diameters and small diameters and different depths are inserted, and between the pistons 11, 12, and 13 and the cylinder hole bottom portions 7a, 8a, and 9a. In addition, hydraulic chambers 14, 15, 16 are defined. The shallow pistons 12 and 13 on the disk inlet side and the outlet side are used as pistons for the first brake system, and the deep piston 11 disposed in the center is used as the second brake system piston. And hydraulic chambers 15 and 16 defined between the cylinder hole bottoms 8a and 9a, respectively, are supplied with hydraulic fluid via the first liquid passage 17, and between the piston 11 and the cylinder hole bottom 7a. The hydraulic fluid is supplied to the hydraulic pressure chamber 14 defined by the second fluid passage 18. Further, a first union boss portion 5e is provided at the disk entry side end portion of the action portion 5a, and a second union boss portion 5f is provided at the center side of the first union boss portion 5e at the disk supply side end portion. The first bleeder boss 5g is provided with a second bleeder boss 5h projecting between the first bleeder boss 5g and the second union boss 5f. Furthermore, the cylinder hole bottom part side of the action part 5a has a stepped shape having a protruding part 5i at the center part by forming the cylinder hole 7 deeper than the other cylinder holes 8 and 9.

  The first liquid passage 17 communicates with the first liquid passage hole 17a that communicates with the fluid pressure chamber 15 of the cylinder hole 8 on the disk delivery side, and the second fluid fluid that communicates with the fluid pressure chamber 16 of the cylinder hole 9 on the disk introduction side. The first liquid passage hole 17a and the second liquid passage hole 17b are in cross communication with each other on the inner peripheral side of the disk with respect to the cylinder hole 7. In other words, the side surface of the cylinder hole 7 that is disposed between the cylinder hole 9 and the cylinder hole 8 with the broken line-shaped first liquid passage 17 constituted by the first liquid passage hole 17a and the second liquid passage hole 17b. The fluid pressure chamber 16 in the cylinder hole 9 and the fluid pressure chamber 15 in the cylinder hole 8 are communicated with each other. The first liquid passage hole 17a is formed to have a small diameter that allows the air to be removed from the hydraulic fluid. The first liquid passage hole 17a is open to the first bleeder boss portion 5g, and the first bleeder hole 17c is formed on the opening side. The second fluid passage hole 17b is formed to have a large diameter so that the hydraulic fluid can be quickly supplied to the fluid pressure chambers 15 and 16, opens to the first union boss portion 5e, and the first union hole 17d on the opening side. Is formed.

  In the first liquid passage 17, first, the second liquid passage hole 17b is cut from the first union boss part 5e side, and then the first liquid passage hole is directed from the first bleeder boss part 5g side to the second liquid passage hole 17b. 17a is cut and the front end side of the first liquid passage hole 17a is cross-communicated with the front end side of the second liquid passage hole 17b.

  The diameters of the first liquid passage hole 17a and the second liquid passage hole 17b are the same as those of the second liquid passage hole 17b even in a state where the angle, length, diameter, and machining tolerance of the machining position of each liquid passage hole 17a, 17b are assumed. The first liquid passage hole 17a can communicate with the first liquid passage hole 17a without deviation, and the communication area of both the liquid passage holes 17a and 17b is set to be equal to or larger than the cross-sectional area of the second liquid passage hole 17b.

  The second fluid passage 18 is formed using the protrusion 5 i of the action portion 5 a, communicates with the fluid pressure chamber 14, opens to the second bleeder boss portion 5 h, and enters the fluid pressure chamber 14. It has a union liquid passage hole 18b that communicates and opens to the second union boss portion 5f. The bleeder liquid passage hole 18a is formed with a small diameter, the second bleeder hole 18c is formed on the opening side, the union liquid passage hole 18b is formed with a large diameter, and the second union hole 18d is formed on the opening side.

  These two fluid passages 17 and 18 communicate with a known hydraulic master cylinder via a brake hose (not shown) connected to each union hole 17d and 18d. For example, the first fluid passage 17 is connected to the brake lever. The second hydraulic passage 18 is connected to a second hydraulic master cylinder that generates hydraulic pressure by brake operation of the brake pedal (both are connected to a first hydraulic master cylinder that generates hydraulic pressure by brake operation (both are both). Not shown).

  When the brake lever is operated, the hydraulic pressure generated in the first hydraulic master cylinder is introduced into the hydraulic chambers 16 and 15 by the first fluid passage 17, and the pistons 13 and 12 move the cylinder holes 9 and 8 through the discs. Advancing in the rotor direction, the lining 6a of the friction pad 6 on the acting portion side is pressed against one side surface of the disk rotor 2. Next, by this reaction, the caliper body 5 moves in the direction of the action part 5a while being guided by the sliding pins 4 and 4, and the reaction force claw 5j of the reaction part 5b moves the lining 6a of the friction pad 6 on the reaction part side to the disk rotor. 2 is pressed against the other side surface to perform a braking action. When the brake pedal is braked, the hydraulic pressure generated in the second hydraulic master cylinder is introduced into the hydraulic pressure chamber 14 by the second hydraulic passage 18 and the piston 11 advances in the cylinder hole 7 toward the disc rotor. As described above, the linings 6a and 6a of the friction pads 6 and 6 are pressed against the side surfaces of the disc rotor 2 to perform a braking action.

  As described above, the first liquid passage 17 of the present embodiment has the first liquid passage hole 17a formed with a small diameter and the second liquid passage hole 17b formed with a large diameter. By cutting the first liquid passage hole 17a toward the hole 17b, or by cutting the second liquid passage hole 17b toward the cut first liquid passage hole 17a, The second liquid passage hole can be reliably and easily communicated. This eliminates the need for precise positioning of the two liquid passage holes 17a and 17b, eliminates labor for processing, and improves productivity and reduces costs. Further, the diameters of the first liquid passage hole 17a and the second liquid passage hole 17b may be the second liquid passage hole even in a state where the angle, length, diameter, and machining position of each liquid passage hole 17a, 17b are assumed. 17b and the first liquid passage hole 17a can communicate with each other without shifting, and the communication area of both the liquid passage holes 17a and 17b is set to be equal to or larger than the cross-sectional area of the second liquid passage hole 17b. There is no loss of flow. Further, the first liquid passage hole 17a having a small diameter has a first bleeder hole 17c formed on the opening side, and the second liquid passage hole 17b having a large diameter has a first union hole 17d formed on the opening side. The hydraulic fluid can be smoothly supplied to the hydraulic pressure chambers 15 and 16 without increasing the size of the caliper body 5, and the liquid through holes 17a and 17b can be formed effectively.

  In addition, the present invention is not limited to the one having three cylinder holes in the working portion as in the above-described embodiment, and can be applied to one having two or less or four or more cylinder holes, The present invention can also be applied to one operated by one hydraulic system. For example, a second liquid passage hole having a large diameter is formed by penetrating a plurality or one cylinder hole, and the first liquid passage having a small diameter is formed so as to intersect with the leading end side through which the second liquid passage hole penetrates. A hole may be formed. Furthermore, union holes may be formed on both opening sides of the first liquid passage hole and the second liquid passage hole, and both liquid passage holes may be opened in the hydraulic pressure chamber. Further, the present invention can be applied not only to the pin slide type caliper body but also to the piston facing type caliper body, and the diameter and depth of the cylinder hole are arbitrary.

1 is a sectional front view of a disc brake showing a first embodiment of the present invention. It is a sectional top view of a disk brake similarly.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4 ... Sliding pin, 5 ... Caliper body, 5a ... Action part, 5b ... Reaction part, 5c ... Bridge part, 5d ... Mounting arm, 5e ... 1st Union boss part, 5f ... 2nd union boss part, 5g ... 1st bleeder boss part, 5h ... 2nd bleeder boss part, 5i ... Projection part, 5j ... Reaction force nail, 6 ... Friction pad, 6a ... Lining, 6b ... Back plate 7, 8, 9 ... cylinder hole, 10 ... hanger pin, 11, 12, 13 ... piston, 14, 15, 16 ... hydraulic chamber, 17 ... first fluid passage, 17a ... first fluid passage, 17b ... Second liquid passage hole, 17c ... first bleeder hole, 17d ... first union hole, 18 ... second liquid passage, 18a ... bleeder liquid passage hole, 18b ... union liquid passage hole, 18c ... second bleeder hole, 18d ... Second union hole

Claims (4)

In a caliper body of a vehicle disc brake in which a cylinder hole, a first fluid passage hole, and a second fluid passage hole are formed in an action portion disposed on a side portion of the disc rotor, the first fluid passage hole and the second fluid passage hole One of the fluid passage holes is formed to communicate with the fluid pressure chamber of the cylinder hole, the one fluid passage hole and the tip end side of the other fluid passage hole are communicated with each other, and the first fluid A caliper body for a disc brake for a vehicle, wherein either one of the through hole and the second liquid through hole has a small diameter and the other liquid through hole has a large diameter. A working portion disposed on a side portion of the disk rotor has a plurality of cylinder holes, a first liquid passage hole communicating with a hydraulic chamber of one of the plurality of cylinder holes, and another cylinder hole. In a caliper body of a vehicle disc brake having a second fluid passage hole communicating with the fluid pressure chamber, the first fluid passage hole and the tip end side of the second fluid passage hole are communicated with each other, and the first fluid A caliper body for a disc brake for a vehicle, wherein either one of the through hole and the second liquid through hole has a small diameter and the other liquid through hole has a large diameter. 3. The vehicle disc brake according to claim 1, wherein a communication area of the first fluid passage hole and the second fluid passage hole is equal to or larger than a cross-sectional area of one fluid passage hole having a small diameter. Caliper body. 4. A bleeder hole is formed on the opening side of one liquid passage hole having a small diameter, and a union hole is formed on the opening side of the other liquid passage hole having a large diameter, respectively. The caliper body of the described disc brake for vehicles.

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