JP5859916B2 - Manufacturing method of caliper body of disc brake for vehicle - Google Patents

Description

The present invention relates to a method of manufacturing a Kyaripabode I of the vehicular disc brake and, more particularly to a method for producing a Kyaripabode I of adjacent hydraulic chambers between the vehicular disc brake having a communication hole for communicating.

  Conventionally, as a caliper body of a disc brake for a vehicle, the working portion is provided with two cylinder holes, and a hydraulic chamber is defined between the piston accommodated in each cylinder hole and each cylinder hole, There was one in which a union hole communicating with both the hydraulic chambers was formed from the outside of the action part (see, for example, Patent Document 1).

JP 2004-132449 A

  However, in the above-mentioned patent document, the two cylinder holes are communicated with each other by the union hole. However, since the union hole opens in the peripheral wall of the cylinder hole, When the piston is retracted until the bottom of the piston and the bottom of the cylinder hole come into contact with each other, there is a concern that the union hole is blocked by the peripheral wall of the piston and the air cannot escape.

The present invention aims at providing a method for producing Kyaripabode I of the vehicular disc brake can be improved air bleeding properties during working fluid filling.

In order to achieve the above object, a caliper body manufacturing method for a vehicle disc brake according to the present invention is provided with a plurality of bottomed cylinder holes in an action portion arranged on a side portion of a disc rotor and accommodated in each cylinder hole. In the method of manufacturing a caliper body for a disc brake for a vehicle, in which a hydraulic chamber is defined between each piston and the bottom of each cylinder hole, and a communication hole is formed for communicating adjacent hydraulic chambers. A step of forming a drilling hole between the cylinder holes having a smaller diameter than an interval between adjacent cylinder holes from the outside of the action part; and a small diameter shaft part having an axis parallel to the axis of the cylinder hole. A cutting tool provided with a disk-shaped cutting blade provided at the tip and having a V-shaped cross-section having a diameter larger than the small-diameter shaft portion and smaller than the inner diameter of the cylinder hole and having a sharpened tip at the outer peripheral portion. The cutting jig is inserted into the cylinder hole, and the disk-shaped cutting blade is directed toward the adjacent cylinder hole in a state where the tip surface of the disk-shaped cutting blade is in contact with the bottom surface of the cylinder hole. And moving each of the fluid passage holes to the bottom side peripheral walls of the adjacent cylinder holes to thereby cut the cutting surfaces of the inner wall surfaces of the two fluid passage holes from the bottom side peripheral walls of the cylinder holes. It is characterized in that it is formed with an arc-shaped inclined surface in which the cross-sectional area of the liquid passage hole gradually decreases toward the drill hole, and the cylinder hole bottom portion side of the cylinder hole side opening is in contact with the bottom surface of the cylinder hole.

Further , it is preferable that the drilling hole is a union hole. Furthermore, after forming the drilling hole, it is preferable to close the opening of the drilling hole that opens to the outside of the action part.

According to the caliper body manufacturing method for a vehicle disc brake of the present invention, the step of forming a drilling hole having a smaller diameter than the interval between the adjacent cylinder holes between the adjacent cylinder holes from the outside of the action portion; A small-diameter shaft portion having an axis parallel to the axis of the cylinder hole, and a disk-shaped cutting blade provided at the tip of the small-diameter shaft portion and having a larger diameter than the small-diameter shaft portion and smaller than the inner diameter of the cylinder hole. Using a cutting jig, insert the cutting jig into the cylinder hole and point the disk-shaped cutting blade in the direction of the adjacent cylinder hole with the tip of the disk-shaped cutting blade in contact with the bottom surface of the cylinder hole. And forming a fluid passage hole in the bottom side peripheral wall of the adjacent cylinder hole to move the hydraulic chambers of the adjacent cylinder holes through the drill hole and both fluid passage holes. Form a communication hole By the time of evacuation when hydraulic fluid filling, it is possible to easily form a good passage of air bleeding property.

  Further, the outer periphery of the disc-shaped cutting blade has a V-shaped cross section with a sharpened tip, so that the disc-shaped cutting blade is in a state where the tip surface of the disc-shaped cutting blade is in contact with the bottom surface of the cylinder hole. By moving the blade in the direction of the adjacent cylinder hole, the inner wall surface of the liquid passage hole is formed into a slope whose cross-sectional area of the liquid passage hole gradually decreases from the peripheral wall on the bottom side of the cylinder hole toward the drill hole. can do. In addition, since the drilling hole is a union hole, the drilling hole and the union hole can be processed in one process, so that the number of processing steps can be reduced. Furthermore, after forming the drilling hole, the opening of the drilling hole can be easily closed by closing the opening opened outside the working part of the drilling hole. Can be formed.

It is II sectional drawing of FIG. It is II-II sectional drawing of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is a top view which shows one example of the caliper body by the manufacturing method of this invention. It is VI-VI sectional drawing of FIG. It is a front view which shows one example of a disc brake by the manufacturing method of this invention. It is a partial cross section top view of a disk brake similarly. It is explanatory drawing which shows the manufacturing method of the caliper body of this invention .

1 to 8 show an example of a two-wheel disc brake . An arrow A indicates a rotation direction of a disc rotor that rotates integrally with a wheel when the vehicle moves forward.

  The disc brake 1 includes a caliper bracket 3 attached to the vehicle body on one side of the disc rotor 2, and a pin slide type supported by the caliper bracket 3 through slide pins 4 and 4 so as to be slidable in the disc axial direction. The caliper body 5 and a pair of friction pads 6, 6 disposed opposite to each other with the disk rotor 2 interposed between the action portion 5 a and the reaction portion 5 b of the caliper body 5.

  The caliper body 5 includes the above-described action part 5a and reaction part 5b arranged on both sides of the disk rotor 2, and a bridge part 5c that connects these parts across the outer periphery of the disk rotor 2, and the action part 5a. Are provided with two bottomed cylinder holes 5d and 5d opened in the disk rotor side in the circumferential direction of the disk, and three reaction force claws 5e are formed in the reaction portion 5b. A piston 7 is inserted into each cylinder hole 5d via a piston seal 8a and a dust seal 8b so as to be liquid-tight and slidable. A hydraulic chamber 9 is interposed between the piston 7 and the bottom surface 5f of the cylinder hole 5d. Are each defined.

  A union boss portion 5g is formed at the outer side in the disk radial direction of the action portion 5a and at the central portion in the disk circumferential direction, and the union hole extends from the union boss portion 5g toward the intermediate portion between the bottoms of both cylinder holes 5d. 10 (drilling hole) is formed. The union hole 10 extends from the large-diameter female screw portion 10a that opens to the upper surface of the union boss portion 5g and the large-diameter female screw portion 10a toward an intermediate portion between the bottom portions of the cylinder holes 5d and 5d. A liquid supply hole 10b having a smaller diameter than the dimension of the intermediate part (interval between cylinder holes) is provided.

  On the bottom side peripheral walls of both cylinder holes 5d and 5d, liquid passage holes 11 and 11 are respectively formed toward the liquid supply hole 10b of the union hole 10, and the liquid passage hole 11 is formed on the bottom side of the cylinder hole 5d. The cross-sectional area is formed with a slope gradually decreasing from the peripheral wall toward the liquid supply hole 10b, and the cutting surface 11a is formed in an arc shape. The adjacent hydraulic chambers 9 and 9 communicate with each other through a communication hole 12 formed by the union hole 10 and the liquid passage holes 11 and 11.

  As shown in FIG. 9, the processing of the liquid passage hole 11 formed as described above is provided at a small diameter shaft portion 13a having an axis parallel to the axis of the cylinder hole 5d, and at the tip of the small diameter shaft portion 13a. The cutting jig 13 is provided with a disk-shaped cutting blade 13b having a diameter larger than that of the small-diameter shaft portion and smaller than the inner diameter of the cylinder hole 5d.

  The caliper body 5 after casting is formed with pilot holes in two cylinder holes, and a union hole 10 is formed from the union boss part 5g toward an intermediate part between the bottoms of the lower holes. The lower hole of the cylinder hole is finished and formed in the cylinder hole 5d. Next, the cutting jig 13 is inserted into the cylinder hole 5d, and the disk-shaped cutting blade 13b is inserted into the adjacent cylinder hole 5d in a state where the tip surface of the disk-shaped cutting blade 13b is in contact with the bottom surface 5f of the cylinder hole 5d. The fluid passage hole 11 is formed in the bottom side peripheral wall of the cylinder hole 5d, and the fluid pressure chambers of the adjacent cylinder holes 5d are communicated with each other through the union hole 10 and the fluid passage holes 11, 11. The communication hole 12 is formed. Further, the liquid passage hole 11 is processed while rotating the disk-shaped cutting blade 13b, whereby the cutting surface 11a is formed in an arc shape.

The caliper body 5 according to the manufacturing method of the present embodiment is formed as described above, and the piston 7 moves backward until the bottom surface 7a of the piston 7 and the bottom surface 5f of the cylinder hole 5d come into contact with each other when evacuating the working fluid. However, since the inner wall surface of the liquid passage hole 11 is formed with an inclined surface in which the cross-sectional area of the liquid passage hole 11 gradually decreases from the peripheral wall on the bottom side of the cylinder hole 5d toward the union hole 10, Communication with both hydraulic chambers 9 can be ensured, and air can be vented well.

  Further, the union hole 10 is opened at the middle part between the bottoms of the two cylinder holes 5d, 5d, the cutting jig 13 is inserted into the cylinder hole 5d, and the tip surface of the disc-shaped cutting blade 13b is connected to the cylinder hole 5d. Since the disc-shaped cutting blade 13b is moved toward the adjacent cylinder hole 5d in a state of being in contact with the bottom surface 5f of the cylinder, the liquid passage hole 11 is formed on the bottom side peripheral wall of the cylinder hole 5d. Can be easily formed.

In addition, the caliper body according to the manufacturing method of the present invention is not limited to the formation of the communication hole using the union hole as in the above-described embodiment, and in addition to the union hole, the caliper body is provided at the intermediate part between the bottoms of the cylinder hole. A drilling hole may be formed, and the drilling hole may be communicated with the liquid passage hole to form a communication hole. In this case, after forming the drill hole, the communication hole can be satisfactorily formed by closing the opening of the drill hole that opens to the outside of the action portion. Moreover, the finishing of the cylinder hole can be performed using a cutting jig for processing the liquid passage hole. Furthermore, the present invention is not limited to the one applied to the two-wheel disc brake as in the above-described embodiment, and can also be applied to a pin slide type caliper body for three wheels or four wheels.

  DESCRIPTION OF SYMBOLS 1 ... Disc brake, 2 ... Disc rotor, 3 ... Caliper bracket, 4 ... Slide pin, 5 ... Caliper body, 5a ... Action part, 5b ... Reaction part, 5c ... Bridge part, 5d ... Cylinder hole, 5e ... Reaction force claw 5f ... bottom surface, 5g ... union boss, 6 ... friction pad, 7 ... piston, 7a ... bottom surface, 8a ... piston seal, 8b ... dust seal, 9 ... hydraulic chamber, 10 ... union hole, 10a ... large diameter female thread DESCRIPTION OF SYMBOLS 10b ... Liquid supply hole, 11 ... Liquid through-hole, 11a ... Cutting surface, 12 ... Communication hole, 13 ... Cutting jig, 13a ... Small diameter axial part, 13b ... Disc-shaped cutting blade

Claims (3)

A plurality of bottomed cylinder holes are provided in the working part arranged on the side of the disk rotor, and a hydraulic chamber is defined between the piston accommodated in each cylinder hole and the bottom of each cylinder hole. In the method for manufacturing a caliper body for a vehicle disc brake in which communication holes for communicating adjacent hydraulic chambers are formed, a hole having a smaller diameter than the interval between adjacent cylinder holes is provided between the adjacent cylinder holes. A step of forming a hole from the outside of the working portion, and a tip of a small diameter shaft portion having an axis parallel to the axis of the cylinder hole, the diameter being larger than the small diameter shaft portion and smaller than the inner diameter of the cylinder hole Then, using a cutting jig provided with a disk-shaped cutting blade having a V-shaped cross-section with a sharpened tip at the outer periphery, the cutting jig is inserted into the cylinder hole, and the disk-shaped cutting blade The end face of the cylinder By moving the disk-shaped cutting blade in the direction of the adjacent cylinder hole in a state of being in contact with the bottom surface of the cylinder, and forming a liquid passage hole on the bottom side peripheral wall of the adjacent cylinder hole, respectively. The cutting surfaces of the inner wall surfaces of the two fluid passage holes are formed by arcuate slopes in which the sectional area of the fluid passage hole gradually decreases from the bottom side peripheral wall of the cylinder hole toward the drill hole, and the cylinder hole A method of manufacturing a caliper body for a disk brake for a vehicle, wherein the bottom side of the side opening of the cylinder hole is in contact with the bottom surface of the cylinder hole. 2. The method of manufacturing a caliper body for a vehicle disc brake according to claim 1, wherein the drilled hole is a union hole. 3. The method of manufacturing a caliper body for a vehicle disc brake according to claim 1, wherein after the formation of the drill hole, an opening of the drill hole that opens to the outside of the action portion is closed.

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