JP2013245795A - Caliper body of disk brake for vehicle and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caliper body of a disk brake for a vehicle and its method for manufacturing that can enhance air releasing when hydraulic fluid is charged.SOLUTION: In a working part 5a mounted in a side part of a disk rotor 2, two cylinder holes 5d are arranged side by side, and a union hole 10 which communicates a liquid pressure chamber 9 formed at bottom surfaces 5f of the cylinder holes 5d from an outside of the working part 5a, is formed. A fluid passage hole 11, which communicates the liquid pressure chamber 9 and the union hole 10, is formed from an inner peripheral surface of the bottom part of each of the cylinder holes 5d, a communication hole 12 for making the liquid pressure chambers of adjoining cylinder holes 5d communicate with each other via the union hole 10 and the fluid passage hole 11, is formed. An inner wall surface of the fluid passage hole 11 is formed on a tilted surface where a cross-section area of the liquid passage hole gradually becomes smaller from the peripheral wall of the bottom surface side of the cylinder hole 5d toward the union hole 10.

Description

  The present invention relates to a caliper body for a vehicle disc brake and a method for manufacturing the same, and more particularly to a caliper body for a vehicle disc brake having a communication hole that allows adjacent hydraulic chambers to communicate with each other and a method for manufacturing the caliper body.

  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.

  Therefore, an object of the present invention is to provide a caliper body for a disk brake for a vehicle and a method for manufacturing the same, which can improve the air bleedability when the hydraulic fluid is filled.

  In order to achieve the above object, a caliper body of a vehicle disc brake according to the present invention is provided with a plurality of bottomed cylinder holes in an action portion disposed on a side portion of the disc rotor and accommodated in each cylinder hole. In the caliper body of the vehicle disc brake, in which a hydraulic chamber is defined between the piston and the bottom of each cylinder hole, and a communication hole is formed to communicate the adjacent hydraulic chambers, the adjacent cylinder holes In between, a drilling hole having a smaller diameter than the interval between adjacent cylinder holes is formed from the outer surface of the action portion, and a fluid passage hole for communicating the hydraulic chamber and the drilling hole is formed in each cylinder hole. A communication hole is formed from the inner peripheral surface of the bottom portion and communicates between the hydraulic chambers of adjacent cylinder holes via the drilling hole and the liquid passage hole, and the inner wall surface of the liquid passage hole is formed of the cylinder hole. Bottom side circumference Is characterized in that the cross-sectional area of the liquid hole toward the drilled hole is formed by gradually becomes smaller slope from.

  Further, it is preferable that two cylinder holes are formed and the drilled hole is a union hole. Furthermore, it is preferable that the cylinder hole side opening of the liquid passage hole is in contact with the cylinder hole bottom surface of the cylinder hole side opening.

  Further, the caliper body manufacturing method for a vehicle disc brake according to the present invention includes a plurality of bottomed cylinder holes in an action portion arranged on a side portion of the disc rotor, and a piston accommodated in each cylinder hole and each piston. In the method of manufacturing a caliper body for a vehicle disc brake in which hydraulic chambers are respectively defined between the bottoms of the cylinder holes and communication holes for communicating adjacent hydraulic chambers are formed. A step of forming a drilling hole having a smaller diameter than an interval between adjacent cylinder holes from the outside of the working part, a small diameter shaft part having an axis parallel to the axis of the cylinder hole, and the small diameter shaft part Using a drilling jig provided with a disc-shaped cutting blade provided at the tip of the disk and having a diameter larger than the small-diameter shaft portion and smaller than the inner diameter of the cylinder hole, and inserting the drilling jig into the cylinder hole, Above By moving the disk-shaped cutting blade in the direction of the adjacent cylinder hole with the tip surface of the disk-shaped cutting blade in contact with the bottom surface of the cylinder hole, liquid is passed through the bottom side peripheral wall of the adjacent cylinder hole. And a step of forming a hole, thereby forming a communication hole that connects the hydraulic chambers of adjacent cylinder holes through the drilled hole and the two liquid passage holes.

  Furthermore, it is preferable that the outer peripheral portion of the disk-shaped cutting blade has a V-shaped cross section with a sharpened tip. 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 of the vehicle disc brake of the present invention, a drilling hole having a smaller diameter than the interval between the adjacent cylinder holes is formed between the adjacent cylinder holes from the outer surface of the action portion. A fluid communication hole is formed from the inner peripheral surface of the bottom of each cylinder hole to communicate the chamber and the drilled hole, and a communication hole for communicating the hydraulic chambers of adjacent cylinder holes via the drilled hole and the fluid communication hole is provided. Due to the formation, when evacuating when filling the hydraulic fluid, even if the piston moves backward until the bottom of the piston comes into contact with the bottom of the cylinder hole, the communication hole communicates with both the hydraulic chambers. Can be ensured, and air can be vented well. Furthermore, since the inner wall surface of the fluid passage hole is formed with an inclined surface in which the cross-sectional area of the fluid passage hole gradually decreases from the peripheral wall on the bottom side of the cylinder hole toward the drill hole, the fluid pressure chamber and the communication hole are formed. It can be easily communicated.

  Furthermore, since two cylinder holes are formed and the drilled hole is a union hole, a communication hole can be easily formed in the two-pot caliper body using the union hole. In addition, the cylinder hole side opening of the fluid passage hole is such that the bottom of the piston and the bottom of the cylinder hole when the vacuum is drawn when the hydraulic fluid is filled, because the cylinder hole bottom side of the cylinder hole side opening is in contact with the bottom surface of the cylinder hole. Even if the piston moves backward until the two come into contact with each other, the hydraulic chamber and the communication hole can be reliably communicated with each other.

  Further, according to the caliper body manufacturing method for a vehicle disc brake of the present invention, the drilling hole having a smaller diameter than the interval between the adjacent cylinder holes is formed 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 the drilling jig provided, insert the drilling jig into the cylinder hole, and the direction of the adjacent cylinder hole with the disk-shaped cutting blade in the state where the tip surface of the disk-shaped cutting blade is in contact with the bottom surface of the cylinder hole Forming a fluid passage hole in each of the bottom side peripheral walls of the adjacent cylinder holes by moving the fluid chambers toward each other, thereby forming the fluid pressure chambers of the adjacent cylinder holes between the holes and the both fluid passage holes. Communicating via The by forming, during the 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 of the caliper body which shows one example of this invention. It is VI-VI sectional drawing of FIG. It is a front view of a disc brake showing an example of the present invention. It is a partial cross section top view of a disk brake similarly. It is explanatory drawing which shows the manufacturing method of a caliper body.

  FIGS. 1 to 8 show an embodiment in which the present invention is applied to 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. And a liquid supply hole 10b having a smaller diameter than the dimension of the intermediate portion (interval between cylinder holes).

  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 of this embodiment is formed as described above, and when evacuating when filling with hydraulic fluid, even if 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, Since the inner wall surface of the liquid passage hole 11 is formed as 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 5 d toward the union hole 10, Communication with the pressure chamber 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.

  Note that the caliper body 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 a hole formed in the middle part between the bottoms of the cylinder hole separately from the union hole. The communication hole may be formed by communicating the hole and the liquid passage 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 (7)

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 caliper body of the vehicle disc brake in which the communication holes for communicating the adjacent hydraulic pressure chambers are formed, a hole having a smaller diameter than the interval between the adjacent cylinder holes is provided between the adjacent cylinder holes. Formed from the outer surface of the action part, and formed a fluid passage hole communicating the fluid pressure chamber and the drilled hole from the inner peripheral surface of the bottom of each cylinder hole, the fluid pressure chambers of adjacent cylinder holes A communication hole that communicates through the drill hole and the liquid passage hole is formed, and the inner wall surface of the liquid passage hole has a gradually increasing cross-sectional area from the peripheral wall on the bottom side of the cylinder hole toward the drill hole. Formed with smaller slopes Caliper body of a vehicular disk brake, characterized and. The caliper body of the disk brake for a vehicle according to claim 1, wherein two cylinder holes are formed, and the drilled holes are union holes. 3. The caliper body for a disk brake for a vehicle according to claim 1 or 2, wherein the cylinder hole side opening of the fluid passage hole is such that the cylinder hole bottom side of the cylinder hole side opening is in contact with the bottom surface of the cylinder hole. 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 action portion, a small diameter shaft portion having an axis parallel to the axis of the cylinder hole, and a diameter larger than the small diameter shaft portion provided at a tip of the small diameter shaft portion, Using a drilling jig equipped with a disk-shaped cutting blade smaller in diameter than the inner diameter of the cylinder hole, insert the drilling jig into the cylinder hole, and contact the tip surface of the disk-shaped cutting blade with the bottom surface of the cylinder hole In the state of letting it By moving the blades in the direction of the adjacent cylinder holes to form liquid passage holes in the peripheral walls on the bottom side of the adjacent cylinder holes. A method of manufacturing a caliper body for a disk brake for a vehicle, wherein a communication hole is formed for communication through the drilled hole and the both liquid holes. 5. The method of manufacturing a caliper body for a vehicle disc brake according to claim 4, wherein the outer peripheral portion of the disc-shaped cutting blade has a V-shaped cross section with a sharpened tip. 6. The method of manufacturing a caliper body for a vehicle disc brake according to claim 4, wherein the drilled hole is a union hole. 6. The caliper body manufacturing method for a vehicle disc brake according to claim 4, wherein after the formation of the perforated hole, an opening of the perforated hole that opens to the outside of the action portion is closed.

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