JPH09126251A - Opposed piston type disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce assembly manhour in an opposed piston type disk brake, by forming in a simple shape a pad pin by which a pad is suspended from a caliper. SOLUTION: A caliper 1 of a disk brake is formed by jointing an inner caliper 1a and an outer caliper 1b to each other by bolts 2. A rectangular opening 22 to which pads 5 are inserted, is formed in the center of the caliper 1, recessed parts 15 are arranged in the central upper parts of back plates 9 integrated with the pads 5, and translots 10 are formed on both sides of the recessed parts 15. Recessed parts 20 and bottomed grooves 8 extended from the recessed parts 20 to both sides, are formed on a caliper side. The assembly of this opposed piston disk brake is finished in such a way that a platelike spring 11 is placed on the upper surfaces of the pads 5, and straight shaft-shape pad pins 7 are fitted to the translots 10 of the back plates 9 and the bottomed grooves 8 of the caliper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pad and pad pin torque receiving structure in an opposed piston type disc brake.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Patent Publication No. 7-127674 discloses a disc brake of this type in which a pin called a hanger pin is inserted into an insertion hole formed in the back metal of a pair of pads arranged to face each other. Is inserted from the outside, the tip of the hanger pin is projected to the outside of the other caliper, and the projection is locked by a clip or the like to prevent the pin from coming off.

[0003]

In the above-mentioned conventional device, it is necessary to prepare stepped pins and parts such as clips in order to prevent the device from coming off. The present invention provides an opposed piston type disc brake that uses a simple straight pin and does not require a clip or the like for preventing slipping out.

[0004]

DISCLOSURE OF THE INVENTION A disk brake according to the present invention has an outer caliper and an inner caliper which are arranged with a rotor sandwiched between them, and an outer caliper having an opening formed in a central portion, an outer caliper and an inner caliper. Equipped with a hydraulically driven piston, a brake pad provided between the piston and the rotor, a pad pin that suspends the pad with respect to the caliper, and a spring fitted between the pad and the pad pin. . Then, the concave portion formed in the central portion of the upper portion, the back metal integrated with the pad having the lateral groove extending from the bottom of the concave portion to both sides, and the lateral groove of the pad back metal are penetrated, and both ends thereof are formed on the wall surface of the opening of the caliper. A straight shaft-shaped pad pin fitted into the bottomed groove is provided.

[0005]

FIG. 1 is a plan view of a disc brake according to the present invention. FIG. 2 is a view taken along the line AA in FIG. The caliper 1 is an inner caliper 1a and an outer caliper 1.
b is fastened with four bolts 2 to be integrated, and a rectangular opening 22 into which a pad is inserted is formed in the central portion.
A piston 3 is incorporated in each of the inner caliper 1a and the outer caliper 1b (the outer caliper 1b is omitted). Inner caliper 1a inlet 4
By sending more pressure oil, the piston 3 moves forward,
The pad 5 is pressed against the rotor 6 to generate a braking force. As shown in FIG. 3, each of the inner caliper 1a and the outer caliper 1b is provided with a bottomed groove 8 into which the tip of a pad pin 7 extending laterally from the recess 20 of the caliper opening 22 is fitted. Further, as shown in FIG. 4, a recess is formed in the center of the pad backing 9 of the pad 5, and a lateral groove 10 extending in both directions from the bottom of the recess.
Is formed and the pad pin 7 is inserted.

The pad pin 7 is of a straight shaft type and has a structure in which the pad pin 7 is engaged with the lateral groove 10 of the pad backing metal 9 via the spring 11 and is engaged with the bottomed groove 8 of the inner caliper 1a and the outer caliper 1b. The pad pin 7 has a structure in which the convex portion 12 of the spring 11 pushes the pad pin 7 to the left and right so that the pad pin 7 cannot be removed.

With the structure as described above, when the pad 5 is assembled, the pad 5 is attached to the opening 2 of the caliper 1.
2 and then put the spring 11 on it and put the pad pin 7 on the lateral groove 10 of the backing 9 and the inner outer caliper 1.
Assembled by pushing into the bottomed groove 8 of a, 1b,
Workability is improved. In terms of cost, the pad pin 7 has a simple shape like a straight shaft, and the clip is unnecessary, so that the cost can be reduced.

Embodiment 2 FIG. 5 shows the shape of the back metal 9a of the pad 5a. An elongated hole 13 is provided on one side of the backing plate 9a. The other side is provided with a lateral groove 14. After passing the pad pin 7 through the long hole 13 of the pad 5a, the pad pin 7 is inserted from above the caliper 1, the pad pin 7 is inserted into the bottomed groove 8 of the inner caliper 1a and the outer caliper 1b, and the spring 11 is placed from above. The other pad pin 7 is hooked in the lateral groove 14 of the back metal 9a and also in the bottomed groove 8 of the inner caliper 1a and the outer caliper 1b.

In this embodiment, the pad pin 7 can be inserted by making the dimension L shown in FIG. 5 larger than the dimension 1 shown in FIG. Slot 13 of back metal 9a
Can also be a vertically elongated slot.

[0010]

As described above, the present invention has a structure in which a lateral groove is provided on the back metal of the pad, and the straight shaft-shaped guide pin hangs in the lateral groove. Similarly, the inner and outer calipers are also provided with bottomed grooves so that the pad pins hang.
By adopting the above groove structure, the pad pin can be fitted after the pad and the spring are assembled.
Since the pad pin has a simple shape like a straight shaft and does not need a clip, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a disk brake according to the present invention in a partial cross section.

FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 3 is an explanatory view showing a bottomed groove portion of an outer caliper (inner caliper).

FIG. 4 is an explanatory view showing a lateral groove provided in a pad.

FIG. 5 is an explanatory view showing a lateral groove and an elongated hole provided in the pad.

[Explanation of symbols]

 1 caliper 1a inner caliper 1b outer caliper 3 piston 5 pad 7 roller 8 bottom groove 9 back metal 10 lateral groove 11 spring 13 long hole

Claims (2)

[Claims] 1. A caliper having an outer caliper and an inner caliper arranged with a rotor sandwiched between them, and a caliper having an opening formed in a central portion, and a hydraulically driven piston mounted on the outer caliper and the inner caliper, A disc brake having a brake pad mounted between a piston and a rotor, a pad pin that suspends the pad with respect to a caliper, and a spring fitted between the pad and the pad pin. And a back metal integrated with a pad having lateral grooves extending in both directions from the bottom of the concave part, and penetrating the lateral groove of the pad back metal, and both ends of which are fitted into bottomed grooves formed on the wall surface of the opening of the caliper. Opposed piston type disc brake with straight shaft pad pins. 2. A caliper having an outer caliper and an inner caliper arranged with a rotor sandwiched between them, and a caliper having an opening formed in a central portion, and a hydraulically driven piston mounted on the outer caliper and the inner caliper. A disc brake having a brake pad mounted between a piston and a rotor, a pad pin that suspends the pad with respect to a caliper, and a spring fitted between the pad and the pad pin. A recess, a lateral groove extending from the bottom of the recess in one direction, a back metal integrated with a pad having an elongated hole provided near the bottom of the recess, and a lateral groove and an elongated hole of the pad backing, both ends of which are An opposed-piston disc brake comprising a straight shaft-shaped pad pin fitted in a bottomed groove formed in the wall surface of the opening of the caliper.