JPS602346Y2 - disc brake - Google Patents

Description

[Detailed description of the invention] This invention is a disc brake used for braking automobiles, which is installed between the support and the backing of the butt to eliminate rattling between the two and to allow the lining of the pad to This invention relates to an improvement in a disc brake having an audible pad clip that generates an audible tone when the lining is worn to the extreme to inform the occupants that it is time to replace the lining.

In a normal disc brake as shown in Fig. 1, the protrusion 3a of the back metal 3 of the pad is slidably engaged with the guide grooves 2, 2 of the support 1 in a direction perpendicular to the plane of the paper. In order to facilitate assembly, a small gap is provided between the sliding parts of the two.

In order to prevent the back metal from shaking due to such a small gap, a pad clip is provided on the sliding portion.

This type of pad clip is attached to the guide groove 2 as shown in Figure 1.
and the protrusion 3a, or
As shown in Japanese Patent Application No. 06, devices that are inserted only between the lower end surface of the back metal and the support, or those that are inserted into both are conventionally used.

In the example in which the pad clip 4 is inserted only between the guide groove 2 and the protrusion 3a shown in FIG. 1, the gap between the lower surface of the back plate 3 and the support is small, so this gap is omitted from illustration. However, in reality, the presence of small gaps is unavoidable.

In conventional disc brakes, the guide groove 2 and the protrusion 3
The pad clip to be inserted between A and A was formed as shown in FIG.

That is, a first piece 4a forming a U-shaped leg of a U-shaped base made of an elastic plate has a tip 4e extending in the same direction.
The extended piece 4c has a length that protrudes to the wear tolerance limit thickness of the lining 5 of the pad, and the tip of the second piece 4b forming a U-shape is directed outward from the base and forms an acute angle with this base. It is bent to form a mounting edge 4d for fixing to the protrusion 3a of the back metal 3 of the pad.

To attach such a pad clip to the sliding part, fit the short rod-shaped part protruding from the back side of the back plate 3 into the hole provided in the mounting edge 4d, and crush this short rod-shaped part. This pad clip 4 is attached to the back metal, and the extension piece 4c is inserted between the guide groove 2 and the protrusion 3a of the back metal.

When the pad clip 4 is attached as shown in FIGS. 3 and 4 in this manner, the tip 4e of the extension piece 4c protrudes to the surface of the pad lining 5 having an allowable wear limit thickness 1.

Therefore, it is possible to prevent the back metal 3 from rattling within the guide groove 2 and generating abnormal noise due to vibrations during running or braking, etc., and when the lining 5 is worn out, the piece 4c
The tip 4e of the pad clip 4 comes into contact with the side surface of the disc 6 (Figs. 3 and 4), and the entire pad clip 4 vibrates finely due to the disc 6 rotating together with the wheel, producing a warning sound to notify the occupant that it is time to replace the pad. occurs.

However, conventional disc brakes having such pad clips have the following disadvantages.

In other words, in conventional disc brakes using pad clips as described above, rattling in the length direction of the pad (direction of arrow a in Figure 1) is effectively prevented by the pad clip provided on the sliding part of the pad. However, the rattling in the width direction of the pad (in the direction of the arrow in Figure 1) is suppressed by the abrasion force between the pad clip 4 and the support, so it is effective in preventing rattling. Less is.

To prevent such wobbling in the width direction of the pad,
Guide groove 2 of support and protrusion of pad back metal.

3a, but this will make it difficult to assemble the pad to the support, and even if it is assembled, the back metal 3 may not slide properly within the guide groove 2. Particularly when the support and back plate are made of iron, if the sliding surface between them gets rusted, the brake will not work, which is very dangerous.

The present invention eliminates the above-mentioned disadvantages, effectively prevents wobbling in both the length and width directions of the pad, and prevents rusting between the backing metal of the pad and the guide groove of the support. The objective is to provide a disc brake that can completely prevent danger.

1 Hereinafter, the present invention will be explained with reference to drawings showing embodiments.

FIG. 5 shows an embodiment of the pad clip 4 used in the disc brake of the present invention.

The overall shape of the clip 4 used in the disc brake of the present invention, which is made entirely of a material such as stainless steel that is resistant to stress and has elasticity, is almost the same as the conventional pad clip shown in FIG. Therefore, the same parts are given the same reference numerals, redundant explanations are omitted, and the characteristic parts will be explained below.

1 The feature of the clip 4 used in the disc brake of the present invention is that on both sides of the mounting edge 4d formed on the second piece 4b,
This is because a sliding contact piece 4f and an elastic contact piece 4g are formed, respectively.

The sliding contact piece 4f and the elastic contact piece 4g are formed by bending protruding pieces formed on both sides of the mounting edge 4d to the side opposite to the base. larger than the width, overlap the sliding contact piece 4f on the side end surface of the protrusion 3a of the back metal,
The elastic contact piece 4g is elastically deformed together with the extension piece 4c so that it can be inserted into the guide groove 2 of the support 1.

When the elastic contact piece 4g is inserted into the guide groove 2 in this way,
The mounting edge 4 is pressed so as to elastically press the sliding contact piece 4f against the guide groove.
The sliding contact portion with d is detoured and bent toward the base.

As shown in FIG. 6, the pad clip 4 used in the disc brake of the present invention configured as described above has the inner surface of the sliding contact piece 4f brought into contact with the side surface of the protrusion 3a of the back metal 3 of the pad. The elastic contact piece 4g is attached in a state slightly lifted from the side surface of the protrusion 3a, and when the protrusion 3a is inserted into the groove 2 of the support 1, the sliding contact piece 4f and the elastic contact piece 4g are attached as extension pieces. 4c
It is used by being inserted between the groove 2 and the protrusion 3a.

The groove 2 and the protrusion 3a of the support 1 are formed so that there is a sufficient gap between the groove 2 and the protrusion 3a to allow insertion of the extension piece 4C, the sliding contact piece 4f, and the elastic contact piece 4g. I'll keep it.

Therefore, when the pad having the pad clip 4 configured and attached in this way is loosely fitted into the guide groove 2 of the support 1, even if the gap between the protrusion 3a of the back metal and the guide groove 2 is made a little wider. Since rattling in the length direction of the pad is absorbed by the extension piece 4c and rattling in the width direction is absorbed by the resilient contact piece 4g, the pad does not rattle within the support 1 at all.

Further, the side surface of the guide groove 2 and the protrusion 3a of the back metal do not come into direct contact, and pieces 4c, 4f, and 4g of a non-rust pad clip made of stainless steel are interposed between them. Therefore, it is possible to prevent the sliding surfaces of both from becoming rusty and causing poor sliding of the pad.

Since the disc brake of the present invention is assembled with a pad clip that is configured and operated as described above, the disc brake does not generate abnormal noise due to rattling of the pad, and can also prevent the danger of pad sliding failure. It has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is a front view of a disc brake using a pad clip, Fig. 2 is a perspective view showing an example of a conventional pad clip, Fig. 3 is an enlarged sectional view taken along line A-A in Fig. 1, and Fig. 4 is a Figure 3 is a view from the left, Figures 5 and 6 show embodiments of the present invention, Figure 5 is a perspective view of the pad clip seen from the opposite direction of Figure 2, and Figure 6 is Figure 4. It is a similar figure. 1: Support, 2: Guide groove, 3: Back metal, 3a: Projection, 4
: pad clip, 4a: first piece, 4b: second piece,
4c: extension piece, 4d: mounting edge, 4e: tip, 4f: sliding piece, 4a second elastic contact piece.

Claims (1)

[Scope of utility model registration request] The protrusion 3a of the back metal 3 of the pad is engaged with the groove 2 provided in the support 1, so that the pad can be freely pressed against the rotor 6 rotating with the wheel during braking, and the base is made of an elastic plate and is formed in a U-shape. An extension piece 4c extending in the same direction and having a length such that the tip 4e protrudes to the wear tolerance limit thickness of the lining 5 of the pad is connected to the first piece 4a forming the leg of the base, thereby forming the leg of the base. The tip of the second piece 4b is bent outside the base to form a mounting edge 4d for fixing to the back metal of the pad,
A sliding contact piece 4f and an elastic contact piece 4g are formed on both sides of this mounting edge 4d, and these two pieces 4f and 4g are bent to the side opposite to the base.
The interval is larger than the width of the guide groove 2 of the support that guides the protrusion 3a of the back metal, and both pieces 4ft4g are elastically deformed to cover three sides of the protrusion 3a of the back metal and fit into the guide groove 2. A pad clip having a size that allows the pad clip to be attached to the backing metal 3 of the pad at the mounting edge 4d, and extending into the gap formed between the outer circumferential surface of the protrusion 3a of the backing metal 3 and the inner circumferential surface of the groove 2. A disc brake that requires insertion of a piece 4c, a sliding contact piece 4f, and an elastic contact piece 4g.