JP5297341B2 - Caliper body for disc brakes for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caliper body of a vehicle disk brake, improving the balance of loads acting on vehicle body mounting bolts and surely mounting the caliper body to a vehicle body without increasing the fastening torque of the vehicle body mounting bolts. <P>SOLUTION: A pair of acting parts 2a, 2a provided on both sides of a disk rotor 3 are connected by a bridge part 2b straddling the outer periphery of the disk rotor 3, and bolt insertion holes 2c for insertion of the vehicle body mounting bolts 5 are penetratingly formed in a disk radial direction at both side portions in a disk rotation direction of one 2a of the acting parts. The center points C1 in the axial direction of the bolt insertion holes 2c are arranged on a plane P1 including the cylinder central axis L1 of cylinder bores 6 adjoining the bolt insertion holes 2c and points C2 of cylinder bore peripheral walls closest to the bolt insertion holes 2c. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a caliper body of a vehicle disc brake, 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.

  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. However, in this mounting structure, when the caliper body is fixed to the vehicle body, if the vehicle body mounting bolt is firmly tightened, the cylinder hole formed in the vicinity of the vehicle body mounting bolt may be deformed by the tightening torque.

  For this reason, the axial center point of the bolt insertion hole is positioned on the outer side in the disk radial direction with respect to the shortest portion connecting the center axis of the cylinder hole formed in the vicinity of the bolt insertion hole and the bolt insertion hole. In some cases, the cylinder hole is prevented from being deformed by the tightening torque of the vehicle body mounting bolt (see, for example, Patent Document 1).

Japanese Patent No. 3934095

  However, since the vehicle body mounting bolt receives a reaction force from the vehicle body side at the time of fastening, the axial center point of the bolt insertion hole of the cylinder hole formed in the vicinity of the vehicle body mounting bolt as in the above-mentioned patent document. If the center axis and the bolt insertion hole are positioned at the outermost position in the disk radial direction than the shortest portion, the balance of the load applied to the vehicle body mounting bolt may be deteriorated. For this reason, it is difficult to produce a predetermined axial force with respect to a predetermined tightening torque applied to the vehicle body mounting bolt, and the caliper body may not be securely mounted to the vehicle body unless the tightening torque of the vehicle body mounting bolt is increased.

  Accordingly, the present invention provides a caliper body for a vehicle disc brake that improves the balance of the load applied to the vehicle body mounting bolt and can securely attach the caliper body to the vehicle body without increasing the tightening torque of the vehicle body mounting bolt. It is an object.

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. A caliper body is formed by connecting with a bridge portion that straddles the outer periphery, and a disk radial bolt insertion hole through which a vehicle body mounting bolt is inserted is formed in both sides of the disk rotation direction of one of the operation parts. The bracket caliper fixed to the vehicle body on the inner side in the disk radial direction of the bolt insertion hole and forming a seating surface on the outer periphery of the bolt insertion hole in the radial direction of the disk in contact with the head of the vehicle body mounting bolt. A disc inner peripheral surface is formed in contact with the mounting boss, and the vehicle body mounting bolt is inserted into the bolt insertion hole. The door end male formed of, in the caliper body of a vehicular disk brake mounting and screwed into the female screw formed in the caliper mounting boss said caliper body to the bracket, the bolt insertion hole, the disc A plane including an axial center point from an inner peripheral side surface to the seat surface including a cylinder central axis of the cylinder hole adjacent to the bolt insertion hole and a point closest to the bolt insertion hole of the peripheral wall of the cylinder hole. It is characterized in that it has placed on top.

  According to the caliper body of the vehicle disc brake of the present invention, when the vehicle body mounting bolt inserted through the bolt insertion hole is fastened to the vehicle body, the load balance applied to the vehicle body mounting bolt can be improved. Accordingly, the caliper body can be securely attached to the vehicle body without increasing the tightening torque of the vehicle body mounting bolt, and the cylinder hole can be prevented from being deformed by the tightening torque of the vehicle body mounting bolt.

It is II sectional drawing of FIG. It is a top view of the disc brake for vehicles which shows one example of the present invention.

  FIG. 1 and FIG. 2 are views showing an example of a vehicle disc brake according to the present invention, and an arrow A indicates the rotation direction of a disc rotor that rotates integrally with a front 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 6 facing each other, and in each cylinder hole 6, a piston 7 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 6, friction pads 8 composed of a lining 8 a and a back plate 8 b are arranged to face each other so as to sandwich the disk rotor 3.

  Bolt insertion holes 2c, 2c in the disk radial direction are provided on both sides of the disk 2 in the disk rotation direction of one working portion 2a, and the body mounting bolts 5, 5 inserted through the bolt insertion holes 2c, 2c are attached to the caliper. The caliper body 2 is attached to the vehicle body by being screwed into the female screw holes 4b and 4b of the boss portions 4a and 4a. A recess 2d is formed on the outer periphery of each bolt insertion hole 2c in the disk radial direction, and a seat surface 2e with which the head 5a of the vehicle body mounting bolt 5 abuts is formed in the recess 2d.

  The vehicle body mounting bolt 5 includes the head portion 5a and a shaft portion 5b, and a male screw portion 5c that is screwed into the female screw hole 4b of the caliper mounting boss portion 4a is formed on the distal end side of the shaft portion 5b. Yes.

  Each bolt insertion hole 2c has a center point C1 in the axial direction from the disk inner peripheral side surface 2f contacting the bracket 4 to the seating surface 2e, and a cylinder center axis L1 of the cylinder hole 6 adjacent to each bolt insertion hole 2c. It arrange | positions on the plane P1 containing the point C2 closest to the said bolt penetration hole 2c of the surrounding wall of the cylinder hole 6. FIG.

  By forming the caliper body 2 of this embodiment as described above, the distance between the seating surface 2e side and the disk inner peripheral side surface 2f side in the bolt insertion hole 2c is equal to the peripheral wall of the cylinder hole 6. Therefore, when the male screw portion 5c of the vehicle body mounting bolt 5 is fastened to the female screw hole 4b of the bracket 4, the load applied to the vehicle body mounting bolt 5 can be distributed to the entire shaft portion 5b in a well-balanced manner. A large axial force can be obtained with respect to the tightening torque applied to 5. Therefore, the caliper body 2 can be securely attached to the bracket 4 without increasing the tightening torque of the vehicle body mounting bolt 5. Thereby, it can prevent that the cylinder hole 6 which is easy to receive to the influence of the fastening torque of the vehicle body attachment bolt 5 can deform | transform, and can operate the piston 7 favorably.

  The caliper body of the present invention is not limited to the 4-pot piston facing type as in the above-described embodiment, but can be applied to a 2-pot or 6-pot or more piston facing type. Further, the present invention can be applied not only to the monocoque structure but also to a split type caliper body.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle disc brake, 2 ... Caliper body, 2a ... Action part, 2b ... Bridge part, 2c ... Bolt insertion hole, 2d ... Recessed part, 2e ... Seat surface, 2f ... Disk inner peripheral surface, 3 ... Disk rotor, 4 ... bracket, 4a ... caliper mounting boss, 4b ... female screw hole, 5 ... body mounting bolt, 5a ... head, 5b ... shaft part, 5c ... male screw part, 6 ... cylinder hole, 7 ... piston, 8 ... friction pad , 8a ... Lining, 8b ... Back plate

Claims (1)

A pair of action portions, which are respectively disposed on both sides of the disk rotor, each provided with a cylinder hole through which the piston is inserted, are connected by a bridge portion straddling the outer periphery of the disk rotor to form a caliper body, and one action portion A disk radial bolt insertion hole through which the vehicle body mounting bolt is inserted is formed in both sides of the disk rotation direction of the disk , and the one action portion is formed on the outer periphery of the bolt insertion hole in the disk radial direction of the vehicle body mounting bolt. Forms a seating surface with which the head abuts, and forms a disc inner peripheral side surface that abuts a caliper mounting boss portion of a bracket fixed to a vehicle body on the inner side in the disc radial direction of the bolt insertion hole, and the bolt insertion hole A male screw formed on the caliper mounting boss portion by inserting a male screw formed at the tip of the vehicle body mounting bolt through the body mounting bolt. In screwed to the caliper body of a vehicular disk brake mounting the caliper body to the bracket,
The bolt insertion hole has a center point in the axial direction from the inner peripheral side surface of the disk to the seat surface to a cylinder central axis of the cylinder hole adjacent to the bolt insertion hole and the bolt insertion hole of the peripheral wall of the cylinder hole. caliper body of a vehicular disk brake, characterized in that it has placed on the plane including the point of closest.

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