JP2011252544A - 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 capable of threading a body securing bolt through a bolt through-hole in a proper condition to fix a caliper body to a bracket without looseness and shortening a time for machining the bolt threading hole, and to provide a method of manufacturing the same.SOLUTION: The bolt threading hole 8 in a disk radial direction threading through the vehicle body securing bolt 5 is penetratingly formed in both sides of the disk rotational direction of one action part 2a of the caliper body 2. The bolt threading hole 8 is a stepped hole continuously having a small diameter hole 8a corresponding to the shaft diameter of the vehicle body securing bolt 5 and a large diameter hole 8b formed in a larger diameter than the small diameter hole 8a, the small diameter hole 8a is precisely machined in an inner diameter D1 having a proper bolt clearance to the shaft diameter of the vehicle securing bolt 5.

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 piston-facing radial mount type caliper body in which a pair of action portions are arranged to face each other with a disc rotor interposed therebetween, and a method for manufacturing the caliper body.

  Conventionally, in a piston-facing radial mount type caliper body, a pair of working parts are arranged opposite to each other with a disk rotor interposed therebetween, and disk insertion holes in the disk radial direction are formed through both sides of one working part. The caliper body is attached to the vehicle body by fastening the vehicle body mounting bolt inserted through the bolt insertion hole to a bracket fixed to the vehicle body.

JP 2008-232397 A

  However, since the bolt insertion hole formed in the caliper body described above must be processed into a state with an appropriate bolt clearance so that the caliper body does not rattle when the caliper body is fixed to the bracket, High precision was required for processing, and it took time and effort.

  Therefore, the present invention allows the vehicle body mounting bolt to be inserted into the bolt insertion hole in an appropriate state so that the caliper body can be fixed to the bracket without rattling, and the time required for processing the bolt insertion hole can be shortened. It is an object of the present invention to provide a caliper body for a vehicle disc brake that can be manufactured and a method for manufacturing the caliper body.

  In order to achieve the above object, a caliper body for a disc brake for a vehicle according to the present invention is provided on each side of the disc rotor, and has a pair of operating portions each having a cylinder hole through which a piston is inserted. In the caliper body for a vehicle disc brake, which is connected by a bridge portion straddling the outer periphery and has a disc radial bolt insertion hole through which a vehicle body mounting bolt is inserted in both sides of the disk rotation direction of one working portion. The insertion hole was continuously provided with a small-diameter hole precisely machined into an inner diameter having a bolt clearance with respect to the shaft diameter of the mounting bolt, and a large-diameter hole formed with a larger diameter than the small-diameter hole. It is characterized by a stepped hole.

  Further, the bolt insertion hole may be one in which the small diameter hole opens on the seat surface side of the vehicle body mounting bolt and the large diameter hole opens on the vehicle body side, and the small diameter hole opens on the vehicle body side. The large-diameter hole may be opened on the seating surface side of the mounting bolt. Furthermore, it is preferable that an axial length dimension of the small diameter hole is longer than an axial length dimension of the large diameter hole.

  The method for manufacturing a caliper body for a vehicle disc brake according to the present invention is characterized in that the small diameter hole is processed after the large diameter hole is processed.

  According to the caliper body of the disc brake for a vehicle of the present invention, since the vehicle body mounting bolt is inserted into the small diameter hole of the bolt insertion hole in an appropriate state, the caliper body can be fixed to the bracket without rattling. In addition, since high accuracy is not required for the machining of the large-diameter hole of the bolt insertion hole, it is possible to shorten the time required for the machining of the bolt insertion hole and to reduce the cost.

  The bolt insertion hole has a small diameter hole on the bolt seat surface side and a large diameter hole on the vehicle body side, or a small diameter hole on the vehicle body side and a large diameter hole on the bolt seat surface side. Since the axial length of the small-diameter hole is longer than the axial length of the large-diameter hole, the caliper body can be securely fixed to the bracket and there is no risk of rattling. .

  According to the caliper body manufacturing method for a vehicle disc brake of the present invention, after processing a large-diameter hole that does not require high accuracy, the small-diameter hole is precisely processed, thereby reducing the time required for processing the bolt insertion hole. And cost reduction can be achieved.

1 is a cross-sectional front view of a vehicle disc brake showing a first embodiment of the present invention. Similarly, it is a plane of a vehicle disc brake. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is a section front view of the disc brake for vehicles in which the example of the 2nd form of the present invention is shown.

  1 to 3 are views showing a first embodiment of a caliper body of a vehicle disc brake according to the present invention, and an arrow A indicates a rotation direction of a disc rotor that rotates integrally with a wheel when the vehicle moves forward.

  The caliper body 2 used in the vehicle disc brake 1 of the present embodiment includes a pair of action portions 2a and 2a that are disposed to face each other with a disc rotor 3 that rotates in the direction of an arrow A together with wheels. It has a monocoque structure integrally formed with the bridge portion 2b straddling, and is attached to caliper mounting boss portions 4a, 4a formed on a bracket 4 fixed to the vehicle body using vehicle body mounting bolts 5, 5. Yes.

  Each operating portion 2a, 2a is provided with two cylinder holes 2c facing each other, and in each cylinder hole 2c, a piston 6 is accommodated in a liquid-tight and movable state, and a 4-pot piston. It is formed in a facing type. On the opening side of the cylinder hole 2c, friction pads 7 composed of a lining 7a and a back plate 7b are arranged so as to face each other with the disc rotor 3 interposed therebetween.

  Bolt insertion holes 8, 8 in the disk radial direction are formed through both sides of the working part 2 a on the turn-out side and the turn-in side in the disk rotation direction. Bolt insertion recesses 2d are formed on the outer periphery of the bolt insertion holes 8 in the disk radial direction of the action portions 2a, and bolt seating surfaces 2e with which the heads 5a of the vehicle body mounting bolts 5 abut on the bolt insertion recesses 2d are formed. Each is formed.

  Each bolt insertion hole 8 is formed as a stepped hole having a coaxial small-diameter hole 8a and a large-diameter hole 8b provided continuously, and is suitable for the shaft diameter of the vehicle body mounting bolt 5 on the bolt seat surface 2e side. A small-diameter hole 8a having an inner diameter D1 having a bolt clearance and a large-diameter hole 8b having an inner diameter D2 larger than the small-diameter hole 8a are formed on the bracket side (vehicle body side), respectively. L1 is formed longer than the axial length L2 of the large-diameter hole 8b. A boss fitting recess 8c is provided around the outer periphery of the opening of the large-diameter hole 8b on the bracket-side end surface of the large-diameter hole 8b.

  The bolt insertion hole 8 is first cut into a large-diameter hole 8b from the bracket side, and a boss fitting recess 8c is processed into the bracket-side end surface of the large-diameter hole 8b. Next, the small-diameter hole 8a is processed, and only the small-diameter hole 8a is precisely finished to an inner diameter D1 having an appropriate bolt clearance with respect to the shaft diameter of the vehicle body mounting bolt 5.

  The caliper mounting boss 4a formed on the bracket 4 is formed to protrude from the bracket 4 corresponding to each bolt insertion hole 8, and each caliper mounting boss 4a has a female thread portion coaxial with the opposing bolt through hole 8. 4b is formed. Further, on the side surface of the caliper body of each caliper mounting boss 4a, there is a protrusion 4c that can be inserted into the boss fitting recess 8c at a position corresponding to the boss fitting recess 8c around the female screw 4b. Each is formed. The vehicle body mounting bolt 5 includes a head portion 5a and a shaft portion 5b, and a male screw portion 5c that is screwed to the female screw portion 4b of the caliper mounting boss portion 4a is formed on the tip end side of the shaft portion 5b. .

  In the caliper body 2 formed in this manner, the boss portion fitting recess 8c formed on the bracket side end surface of the bolt insertion hole 8 is fitted into the protrusion 4c of each caliper mounting boss portion 4a, and the bolt insertion hole is formed. 8 and the female screw part 4b are aligned. Next, the shaft portion 5b of the vehicle body mounting bolt 5 is inserted from the bolt seating surface 2e side of the bolt insertion hole 8 and the male screw portion 5c on the front end side is screwed into the female screw portion 4b, whereby the caliper mounting boss portion 4a is inserted. The caliper body 2 is connected. The vehicle body mounting bolt 5 is inserted between the small diameter hole 8a with an appropriate bolt clearance, and the axial length L1 of the small diameter hole 8a is the axial length of the large diameter hole 8b. By being formed longer than the dimension L2, there is no possibility of rattling in the bolt insertion hole 8, and the caliper body 2 can be fixed to the bracket 4 without rattling. In addition, since the machining of the large-diameter hole 8b of the bolt insertion hole 8 does not require accuracy, the finishing process can be omitted, the time required for the machining can be shortened, and the cost can be reduced. it can.

  FIG. 4 shows a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Each bolt insertion hole 9 in this embodiment has a large diameter hole 9a on the bolt seat surface 2e side, a small diameter hole 9b on the bracket side (vehicle body side), and a small diameter hole on the bracket side end surface of the small diameter hole 9b. A boss fitting recess 9c is provided continuously around the outer periphery of 9b. Further, the length dimension L3 in the axial direction of the large diameter hole 9a is longer than the length dimension L4 in the axial direction of the small diameter hole 9b. As a result, the axial length dimension L3 of the large-diameter hole 9a is formed longer than the axial length dimension L4 of the small-diameter hole 9b that requires precise processing. It is possible to further reduce the time required for.

  In addition, the present invention is not limited to the bolt insertion hole processed into two stages of a large diameter hole and a small diameter hole as in the above-described embodiments, and the large diameter hole may be processed into a plurality of stages. Moreover, a small diameter hole can also be formed in the intermediate part of several large diameter holes.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Caliper body, 2a ... Action part, 2b ... Bridge part, 2c ... Cylinder hole, 2d ... Bolt insertion recessed part, 2e ... Bolt seat surface, 3 ... Disc rotor, 4 ... Bracket, 4a caliper Mounting boss part 4b Female thread part 4c Projection part 5 Car body mounting bolt 5a Head part 5b Shaft part 5c Male thread part 6 Piston 7 Friction pad 7a Lining 7b ... Back plate, 8 ... Bolt insertion hole, 8a ... Small diameter hole, 8b ... Large diameter hole, 8c ... Boss part fitting recess, 9 ... Bolt insertion hole, 9a ... Large diameter hole, 9b ... Small diameter hole, 9c ... Boss Partial fitting recess

Claims (5)

A pair of action portions respectively provided on both side portions of the disk rotor and provided with cylinder holes through which the pistons are inserted are connected by bridge portions straddling the outer periphery of the disk rotor, and both sides of the one action portion in the disk rotation direction are connected. In the caliper body of the disc brake for a vehicle, in which a bolt radial insertion hole for inserting the vehicle body mounting bolt is formed in the part, the bolt insertion hole has an inner diameter having a bolt clearance with respect to the shaft diameter of the mounting bolt. A caliper body for a disc brake for a vehicle, wherein the caliper body is a stepped hole continuously including a small-diameter hole that is precisely machined and a large-diameter hole that has a larger diameter than the small-diameter hole. The caliper body of the disk brake for a vehicle according to claim 1, wherein the bolt insertion hole has the small-diameter hole opened on the seat surface side of the vehicle body mounting bolt and the large-diameter hole opened on the vehicle body side. The caliper body of the disk brake for a vehicle according to claim 1, wherein the bolt insertion hole has the small-diameter hole opened on a vehicle body side and the large-diameter hole opened on a seat surface side of the vehicle body mounting bolt. 4. The vehicle disc according to claim 1, wherein a length dimension in the axial direction of the small diameter hole is longer than a length dimension in the axial direction of the large diameter hole. Brake caliper body. 4. The vehicle disc brake caliper body manufacturing method according to claim 1, wherein the small-diameter hole is processed after the large-diameter hole is processed. 5. Caliper body manufacturing method.

Images