JPH0989019A - Friction pad attaching structure of disk brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a brake pad from being pulled out by a pressing spring and prevent play by engaging both ends of a linear pad spring with the ear shaped pieces of both front and rear guide plates so as to be freely attached/ detached and elastically pressing the outer surface of a friction pad in its radial direction by this pad spring. SOLUTION: When a guide plate is loaded in the window hole of a caliper 1, a shelf piece is supported by being placed on shelves in both front and rear inner surfaces of the window hole and engaging projections are fixed by being engaged with holes in both front and rear inner surfaces of the window hole. When a friction pad 5 is inserted into the window hole in this condition, its ear pieces 7a and 7b are supported by the shelf pieces of the guide plate. Then, the engaging piece of a linear pad spring 15 is expanded and opened, the ear shaped piece of the guide plate is inserted into this and engaged with the notched part of the ear piece. Thus, linear pad spring 15 is fixed on the guide plate and both inner and outer friction pads are pressed inward in a radial direction by its pressing piece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction pad mounting structure for an opposed piston type disc brake, and a pad pressing support mechanism is devised so that a pad holding pin can be omitted to simplify the friction pad mounting structure. It is possible to reduce the manufacturing cost thereof and to easily and easily attach and remove the friction pad.

[0002]

2. Description of the Related Art In opposed piston type disc brakes, it is well known that a pad holding pin is used as a guide and support structure for a friction pad (for example, Japanese Patent Laid-Open No. 62-62160).
-220724). An outline of this conventional friction pad mounting structure will be described with reference to FIGS. 7 and 8. This is one in which the friction pads 73, 74 are put in and taken out from the window hole 72 of the fixed caliper 71 to be attached and detached. The pad holding pins 77, 78 are inserted in the holes of the back plates 75, 76 of the friction pads. Is inserted with sufficient play, and both ends of this pad holding pin are fixed to the side walls 80 and 81 of the window hole 72. Then, both ends of one piece of the cross-shaped leaf spring 82 are engaged with the lower surfaces of the pad holding pins 77 and 78 in the radial direction, and the outer ends of the friction pads 73 and 74 in the radial direction are held by the ends of the other piece. This prevents rattling of the friction pad. The friction pads 73 and 74 are calipers 71.
Is pressed by the operation of the brake piston and is guided and moved by the pad holding pins 77 and 78 to brake the brake disc. To remove the friction pad, the pad holding pins 77 and 78 must be removed from the caliper, which is a troublesome operation. If the friction pad can be prevented from coming off without using the pad holding pin, the attachment / detachment of the friction pad will be extremely simple and easy. On the other hand, as a structure in which a friction pad is slidably supported by a caliper without using a pad holding pin, there is a structure described in Japanese Utility Model Laid-Open No. 6-6772. The friction pad support structure of this one is as shown in FIGS. 9 and 10, and the guide grooves 93a, 9 having a U-shaped cross section are formed on both front and rear surfaces of the window hole 92 of the caliper 91.
3a is provided and the back plate 95 of the friction pad 94 is provided in the guide groove.
The ear pieces 95a, 95a are engaged with each other. Detachment ports 93b, 93b are provided at both ends of the guide grooves 93a, 93a in the axial direction of the disc, and the ear pieces 95a, 95a are put in and out from the attachment / detachment ports to attach / detach the friction pad 94 to / from the caliper. Is. In this case, since the ear pieces 95a, 95a of the friction pad are engaged with the U-shaped guide groove 93a and the ear piece 95a is put in and taken out from the attaching / detaching ports 93b, 93b, the friction pad is attached and detached. Since the attachment / detachment operation is not easy and the rattling prevention means is not particularly taken, the problem of rattling of the friction pad remains.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of both of the above-mentioned prior arts at once, and for that reason, a brake is provided by a pressing spring without using a pad holding pin or a U-shaped guide groove. It is an object to devise a structure for attaching a friction pad by a pressing spring so that the pad can be prevented from coming off and rattling can be prevented.

[0004]

[Means for Solving the Problems] The measures taken to solve the above problems are constituted by the following elements (a) to (c). (A) Provide the guide plate with the ear piece and the shelf piece that project outward in the radial direction, fix the guide plate to the front and rear inner surfaces of the window hole of the caliper, and attach the shelf piece of this guide plate to the window hole of the caliper. Supporting the shelves provided on the front and rear inner surfaces,
(B) The ears of the back plate of the friction pad are placed on the shelves of the guide plate so that they can be slidably supported. (C) Both ends of the linear pad spring can be freely attached to and removed from the ears of the front and rear guide plates. It is locked and the radial outer surface of the friction pad is elastically pressed by the pad spring.

[0005]

[Operation] With the shelves of the guide plates placed on the caliper shelves, fix the guide plates to the front and rear inner surfaces of the caliper window hole, and insert the friction pads through the caliper window hole. Then, both ends of the linear pad springs are respectively locked to the ear pieces protruding in the radial direction of both guide plates, thereby pressing the radial outer surfaces of the friction pads. The friction pad is slidably supported by the ledge of the guide plate fixed to the front and rear inner surfaces of the window hole by its ears. And since both ends of the linear pad spring are locked by the guide plates fixed to the caliper,
This presses the friction pad radially inward of the brake disc. The pressing force of this linear pad spring against the friction pad keeps the friction pad from coming off and its ears press elastically against the tabs of the guide plate. Therefore, the rattling is prevented.

[0006]

[Embodiment] Next, an embodiment will be described with reference to the drawings. The caliper 1 is formed by integrating the inner caliper 1A and the outer caliper 1B with four bolts 2, and the caliper 1A, 1B forms a square window hole. Shelf pieces 1 of the guide plate 9 on both the front and rear inner surfaces of this window hole
A shelf 1a on which 3 is placed is provided. Guide plate 9
Has an inverted U-shape so as to straddle the outer periphery of the brake disc 6, and the locking protrusions 10, 11, at right angles to the three inner sides thereof.
12 are projected. Further, shelf pieces 13 and 13 are provided at right angles on both sides of the upper end of the guide plate 9, and an ear piece 14 is provided at the center of the upper end. Notches 14a, 14a that are inclined obliquely upward are provided on both sides of the center ear piece 14. This guide plate is a steel plate such as stainless steel,
It is easily and easily formed by punching a steel plate and pressing it. The back plate 7 of the friction pad has ears 7a and 7b.
Is provided, and the ears 7a and 7b are provided on the guide plate 9
Of the caliper 1 is slidably supported in a state of being suspended on the shelf 1a of the caliper 1. The linear pad spring can adopt various shapes, but it does not come off from the ear piece 14 of the guide plate 9 due to vibration and external force, but it is relatively easily disengaged by elastically deforming in the lateral direction. It must be in shape. In this embodiment, the cross having the locking pieces 15a and 15b and the pressing pieces 15c and 15d by bending the linear spring material is taken from the relationship between the shape of the tab 14 of the guide plate and the locking notch 14a. It is formed into a shape, and in particular, the locking pieces 15a, 1
5b has a structure capable of elastically expanding its width. The locking pieces 15a and 15b can be expanded to easily engage and disengage with the notch 14a of the ear piece 14 of the guide plate, and the notch 14a is inclined obliquely upward.
Since the tip 15e of the locking piece 15a is bent upward, and the tip 15f of the locking piece 15b is bent laterally outward, the locking pieces 15a, 15b are notched by the external force, vibration or the like. You can never get out of. When the guide plate is attached to the window hole of the caliper 1, the shelf piece 13 is placed and supported on the shelf 1a on the front and rear inner surfaces of the window hole, and the locking projections 10, 11, 12 are formed on the front and rear inner surface holes of the window hole. It is engaged and fixed. When the friction pad is inserted into the same window hole in this state, the ears 7a, 7b of the friction pad,
Supported by 13. Then, the linear pad spring 15
The locking pieces 15a, 15b of the above are expanded and the ear piece 14 of the guide plate 9 is inserted into this, and the notch of the ear piece 14 is engaged with this. As a result, the linear pad spring 15
Is fixed to the guide plate, and its pressing pieces 15c, 1
Both the inner and outer friction pads are pressed inward in the radial direction by 5d. The above is the embodiment using the guide plate shown in FIG. 3 and the linear pad spring shown in FIG. 4, but the guide plate and the linear pad spring are shown in FIGS.
The shape and structure shown in FIG. This example is ear piece 1
4 is provided with an inverted T-shaped notch 14'a, and a locking piece 15'a of the linear pad spring 15 'for engaging and disengaging with the notch
Is formed into a shape and a structure that easily elastically contracts inward in the width direction. In this device, the widths of the locking pieces 15'a and 15'b are reduced, and the locking pieces 15'a and 15'b are fitted into the inverted T-shaped notches and engaged with the notches 14'a. When the brake pressure acts on the cylinder of the caliper 1 and the brake pistons 3 and 3 operate, the friction pads 5 and 5 are pushed and the brake is applied. The brake torque applied to the friction pads 5 and 5 is received by the torque receiver 8 of the caliper. Reference numeral 4 is an inlet for sending pressure oil to the caliper.

[0007]

[Effects] The friction pad support structure of the present invention is such that the ear portion of the friction pad is slidably supported by suspending it from the caliper shelf, and the linear pad spring is locked to the guide plate. Since the friction pad is pressed by the friction pad, the friction pad can be easily and easily attached and detached by removing the linear pad spring. Further, the guide support structure of the friction pad is not based on the pad holding pins as in the prior art, nor is it based on the U-shaped grooves on the front and rear inner surfaces of the caliper window hole, but is based on the shelves on the inner surface of the caliper window hole. In addition, since the ears of the friction pad are slidably guided by the shelves of the guide plate, the guide support structure of the friction pad is simplified and the processing cost thereof is reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of an example of a guide plate.

FIG. 4 is a perspective view of an example of a pad spring.

FIG. 5 is a perspective view of another example of the guide plate.

FIG. 6 is a perspective view of another example of the pad spring.

FIG. 7 is a plan view of a conventional disc brake.

8 is a half sectional view taken along line XX of FIG.

FIG. 9 is a plan view of another conventional disc brake.

FIG. 10 is a sectional view taken along the line YY of FIG. 9;

[Explanation of symbols]

 1 ... Caliper 1a ... Shelf of caliper 1A ... Inner caliper 1B ... Outer caliper 2 ... Bolt 3 ... Brake piston 4 ... Inlet 5 ... Friction pad 6 ... Brake disc 7 ... Friction pad back plate 7a, 7b ... Friction pad back plate ear 8 ... Torque receiver 9 ... Guide plate 10, 11, 12 ... Locking protrusion 13. ..Guide plate shelves 14 ... guide plate ears 14a ... notches 15,15 '... linear pad springs 15a, 15'a, 15b, 15'b ... locking pieces 15c, 15d ... Pressing piece 15e ... Tip of locking piece 15a 15f ... Tip of locking piece 15b

Claims (2)

[Claims] 1. An ear piece and a shelf piece that project outward in the radial direction are provided on a guide plate, and the guide plate is fixed to both front and rear inner surfaces of a window hole of the caliper, and the shelf piece of the guide plate is attached to the window of the caliper. Support the shelves provided on the front and rear inner surfaces of the hole, place the ears of the friction pad back plate on the shelves of the guide plate, and slidably support the front and rear guide plates. A friction pad mounting structure for a disc brake in which both ends are detachably locked and the radial outer surface of the friction pad is elastically pressed by the pad spring. 2. An opposed piston type disc brake having a friction pad mounting structure for a disc brake according to claim 1, wherein the linear pad spring has a cross shape by bending a wire rod.