JPS6231695Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a caliper body for a disc brake.

Conventionally, an actuating part having a cylinder and a reaction part having a reaction claw are integrally formed via a bridge part, and a piston is inserted from a notch formed between the inner surface of the actuating part and the inner surface of the reaction part. In a caliper body in which a piston is mounted in a cylinder, the width of the notch is made wider than the length of the piston, and the piston inserted into the notch is moved in a direction perpendicular to the direction of insertion and is mounted in the cylinder.

Therefore, since the width of the notch is wider than the length of the piston, the caliper body becomes longer and larger in the axial direction of the disc rotor. Shortening the length had the disadvantage of lowering the rigidity of the reaction force section.

It is also possible to attach the piston to the cylinder by inserting it between the two reaction claws formed on the reaction part, but this is especially true for small caliper bodies.
If the spacing between the reaction claws is larger than the piston diameter, the width of the pad will have to be made wider, or even if it is not widened, the spacing between the reaction claws will become closer to the width of the pad, and considering the stiffness of the pad back plate, This will lead to a decrease in transmission efficiency, and if the back plate of the pad is thickened and the spacing between the reaction claws is increased to maintain the rigidity of the reaction force part, the axial length of the piston and the outside of the reaction claws of the carrier body will protrude. The disadvantage was that it became larger.

Therefore, the present invention was researched and developed in order to eliminate these drawbacks.In the caliper body where the piston is attached to the cylinder from the notch, it is made smaller without reducing the rigidity of the reaction force part, and the disc of the caliper body is made smaller. The purpose is to ensure rotor straddle width and facilitate piston assembly.

In order to achieve the above purpose, the present invention:
The width of the notch between the actuating part and the inner surface of the reaction part of the caliper body is formed to be narrower than the piston length, and the diameter is larger than the piston diameter, and the distance between the inner surface of the actuating part and the surface opposite to the inner surface is narrower than the piston length. A concave portion larger than the piston length is formed on the inner surface of the reaction claw with an opening in the direction opposite to the bridge portion, and a pad pressing portion is formed on the inner surface of the reaction claw outside of the recess. By forming a concave part only in a part of the reaction claw, the length in the axial direction of the disc rotor can be shortened without reducing the rigidity of the reaction part, and the reaction claw in the circumferential direction of the disc rotor can be shortened. By shortening the interval between the two, the carrier body can be made smaller.

An embodiment shown in FIGS. 1 to 4 will be described below.

1 is a disc rotor that rotates integrally with the wheel; 2 is a bracket that is fixed to a fixing part 4 formed in a fork 3 of a two-wheeled vehicle with a bolt (not shown) passing through bolt holes 5, 5, and the disc rotor rotates. Torque receiving portions 6 and 7 are formed so as to straddle the disc rotor 1 only on the exit side, that is, the side fixed to the vehicle body, and contact only one side edge of both the actuating side and reaction side pads, respectively.

Reference numeral 8 designates a pad on the operating side, 9 a back plate thereof, 10 a shim plate provided on a part of the back surface of the back plate 9, 11 a pad on the reaction force side, and 12 a back plate thereof.

Reference numeral 13 denotes a carrier body, in which an actuating part 16 having a cylinder 15 and a reaction part 17 having two reaction claws 17a and 17b are integrally molded across the disk rotor 1 by a bridge part 14. A substantially semicircular arc-shaped inner circumferential wall 18 extending over the book reaction claws 17a and 17b is formed, and the diameter D ₁ of the inner circumferential wall 18 is
is formed to be smaller than the diameter D ₂ of the piston 19 that is slidably mounted on the cylinder 15. Reference numeral 20 denotes a notch formed between the inner surface 16a of the actuating portion 16 and the inner surface 17c of the reaction force portion 17;
a and the pad pressing portion 17d of the reaction claws 17a and 17b.
The notch width L ₁ between the pads 8, 11 (back plates 9, 12, shim plate 10
(including) thicknesses T ₁ and T ₂ , thickness T ₃ of disk rotor 1 when unworn, operating side pad 8 and operating part 1
6 with the inner surface 16a, that _is , the sum of the proper gap C1 between both pads 8, 11 and the disc rotor ₁ required when assembling the vehicle body, and the amount of rollback caused by the corner seal 23, which will be described later. Therefore, the length is narrower than the length _L2 of the piston 19.

21 is the inner peripheral wall 18 of the inner surface 17c of the reaction force part 17
It is a recess formed in a substantially semicircular arc shape that opens in the anti-bridge direction along the diameter D ₃ of the inner peripheral edge 21a.
has a larger diameter than the piston diameter _D2 , and the actuating part 16
The depth is such that the distance _L3 between the inner surface 16a and the opposing surface 21b is greater than the piston length _L2 . Therefore, the pad pressing portion 17 is provided on the inner surface 17c of the reaction force portion 17 outside the recessed portion 21.
d is formed.

22 is a concave portion formed by removing the inner flesh of the bridge portion 14 and has a substantially U-shaped cross section, 23 is a corner seal provided in the cylinder 15, 24 is also a dust seal, 25 is a hydraulic fluid hole for the cylinder 15, 26 is a breeder.

Reference numeral 27 indicates a hanger pin for suspending the pads 8 and 11 from the carrier body 13; 28 indicates a clip for fixing the pin 27 to the carrier body 13; 29 indicates a retaining recess of the clip 28 formed in the reaction portion 17 of the carrier body 13; is a pad spring attached to the concave portion 22 of the bridge portion 14.

Reference numerals 31 and 32 denote sliding pins screwed into the bracket 2, and the sliding pin 32 is arranged on the inner periphery of the sliding pin 31 in the radial direction of the disc rotor 1, and both pins 31 and 32 are attached to the carrier body. It is arranged on the disk rotor rotation side, that is, on the vehicle body fixed side, with respect to the line Y connecting the center of the cylinder 15 of No. 13 and the disk rotor shaft. Reference numerals 33 and 34 denote sliding pin mounting arms that are integrally formed in the actuating portion 16 of the carrier body 13 and protrude from the line Y toward the disk rotor rotation side, and the sliding pin mounting arms 34 can be slid in the radial direction of the disk rotor 1. Pin mounting arm 33
Place it on the inner periphery. Reference numerals 35 and 36 denote guide holes formed in the sliding pin mounting arms 33 and 34, respectively, and the slide pins 31 and 32 inserted into the holes 35 and 36 support the carrier body 13 so as to be movable in the axial direction of the disk rotor. . 37 is a fixing nut for the sliding pin, and 38 is a boot.

The carrier body 13 has a diameter D ₂ of the piston 19 along the inner peripheral wall on the inner surface 17c of the reaction force part 17.
Since the recess 21 is formed in a substantially semicircular arc shape that has a larger diameter and opens on the anti-bridge side where the distance _L3 between the inner surface 16a of the actuating portion 16 and the piston ₁₉ is larger than the length L2 of the piston 19, the piston 19 When assembling to the carrier body 13, the two reaction claws 17a, 17b
Since the piston 19 can be inserted into the notch 20 without being obstructed by the
can be installed easily.

It should be noted that the present invention is not limited to the caliper body shown in the above-mentioned embodiments, but can of course be implemented as long as it is a caliper body in which an actuating portion and a reaction portion are integrally formed.

As mentioned above, the present invention has a cutout formed between the inner surface of the actuating part and the inner surface of the reaction part of the caliper body, which has a width narrower than the piston length, a diameter larger than the piston diameter, and A recess in which the distance between the inner surface of the part and the surface facing the inner surface is larger than the length of the piston is formed on the inner surface of the reaction part by opening in the direction opposite to the bridge part, and on the inner surface of the reaction part outside of the recess. Since the pad pressing part is formed, a concave part is formed only in a part of the reaction force part, so the length of the caliper body in the axial direction of the disc rotor can be shortened without reducing the rigidity of the reaction force part, and the piston Since it is inserted into the cylinder from the notch, there is no need to increase the distance between the reaction claws, and therefore the caliper body can be made smaller without interfering with the insertion of the piston. The peripheral wall can be shaped appropriately, and the transmission efficiency can be made appropriate.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a partially sectional front view, Fig. 2 is a sectional view of Fig. 1,
FIG. 3 is a sectional view taken from FIG. 2, and FIG. 4 is a front view seen from inside the reaction portion of the carrier body. 1 is the disc rotor, 13 is the caliper body,
15 is a cylinder, 16 is an operating part, 16a is its inner surface, 17 is a reaction part, 17a, 17b are reaction claws,
17c is an inner surface, 17d is a pad pressing part, 18 is an inner circumferential wall, 19 is a piston, 20 is a notch, 21 is a recess, 21a is an inner circumferential edge, 21b is a surface opposite to the inner surface 16a, and _L1 is a surface of the notch 20. Width, L ₂ is piston 1
The length of 9, L ₃ is the inner surface 16a and the surface 2 of the recess 21.
1b, D ₁ is the diameter of the inner peripheral wall 18, D ₂ is the diameter of the piston 19, and D ₃ is the diameter of the inner peripheral edge 21a of the recess 21.

Claims (1)

[Scope of utility model registration request] An actuating part having a cylinder and a reaction part having a reaction claw are integrally formed through a bridge part, and the piston is inserted into the cylinder through a notch formed between the inner surface of the actuating part and the inner surface of the reaction part. In the caliper body to be attached to, the width of the notch is narrower than the piston length, the diameter is larger than the piston diameter, and the distance between the inner surface of the actuating part and the surface facing the inner surface is larger than the piston length. 1. A disc brake caliper body, characterized in that a recessed portion is formed on an inner surface of the reaction force portion by opening in a direction opposite to the bridge portion, and a pad pressing portion is formed on the inner surface of the reaction force portion outside the recessed portion.