JPS5853215B2 - Friction pad vibration prevention spring device for disc brakes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction pad vibration prevention spring device for a disc brake in which a pair of friction pads are slidably guided and supported by a support.

In conventional disc brakes, where the gap between the friction pad guide part of the support and the friction pad is extremely small enough to allow the friction pad to slide smoothly, noise due to vibration of the friction pad during braking is generated. Although this rarely occurs, when antifreeze is sprayed on the road surface,
When this is scattered by the running of the vehicle, it may get caught in the sliding gap between the support and the friction pad, causing rust between the support and the friction pad.

In order to solve this problem, it is necessary to provide a large sliding gap between the support and the friction pad (more precisely, the back plate of the friction pad) in the circumferential direction and the radial direction of the brake disc.

However, if the sliding gap between the support and the back plate of the friction pad is increased, the friction pad may vibrate while the vehicle is running or when the brakes are applied, causing unpleasant noise.

In order to prevent such vibration of the friction pad, for example, as shown in Japanese Patent Application Laid-Open No. 51-19277,
It has been proposed that a plate spring for preventing vibration is attached in advance to protrusions formed on both side edges of a friction pad, and the plate spring is slidably guided into a recess of a support.

However, since the anti-vibration spring has a complicated shape and is attached to the back plate of the friction pad, the brake action anti-vibration spring slides against the support together with the friction pad. Depending on the condition of the assembly, the smooth sliding of the friction butt may be impaired, and when the friction pad is replaced, the anti-vibration spring must be replaced with a new friction pad, which is time-consuming.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disc brake that is easy to mold, can be easily attached to the friction pad guide protrusion of the support without coming off, and does not require reassembling the spring when replacing the friction pad. An object of the present invention is to provide a friction pad anti-vibration splash device.

For this reason, in the structure of the present invention, a protrusion is provided on the support adjacent to the friction surface of the brake disc and extends in a direction perpendicular to the friction surface, and a notch is provided in the back plate of the friction pad in relation to the protrusion. A vibration prevention spring for applying a spring force in a direction parallel to a friction surface of the brake disc to a rear portion of the brake disc in a normal rotational direction of the brake disc in a disc brake that is slidably engaged with the disc brake. An anti-vibration spring device is provided in which one end piece of a U-shaped leaf spring is engaged with the notch in the back plate, the other end piece is divided into three strips, and the center end piece is divided into three strips. is bent so as to sandwich both end walls of the protrusion that abut against the protrusion of the support and are parallel to the friction surface of the brake disc, and a pair of both end pieces are in contact with the friction surface of the brake disc. It is constructed so that both the front and back surfaces of the right-angled protrusion are held.

The present invention will be explained based on illustrated embodiments.

A disc brake equipped with an anti-vibration spring device according to the present invention includes a support 13 fixed to a non-rotating part of the suspension, a pair of friction pads 18 and 19 arranged on both friction surfaces of a brake disc 150, and a pair of pins 10 extending
．． The caliper 30 is guided and supported by l'l.

The support 13 is made by bending a thick annular flat plate at right angles from approximately the center part, and straddling the vertical wall part 14 arranged parallel to the friction surface of the brake disc 15 and the outer periphery of the brake disc 15. 15, and pins 10 and 11 extending perpendicularly to the friction surface of the brake disc 15 are fixed to the vertical wall portion 14.

The vertical wall portion 14 has protrusions 22, 22a on its inner edge for guiding and supporting one of the friction pads 18.

The portion where the support 13 straddles the brake disc 15 is actually inclined along the outer periphery of the brake disc 15.

Projections 17, 17a are provided on the inner edge of the horizontal plate portion 16 of the annular support 13 adjacent to the brake disc 15.

The protrusions 17, 17a are located closer to the axis than the outer periphery of the brake disc 15, and guide and support the other friction pad 19.

The friction pad 19 is coupled to a back plate 21, and notches 21a (see FIG. 4) provided on both side edges of the back plate 210 are engaged with the protrusions 17, 17a, and the friction pad 19 is connected to the brake disc 15. is slidably guided in a direction perpendicular to the friction surface of the

The friction pad 18 also has a back plate 20 having notches on both side edges.
The notch is engaged with the protrusion 22° 22a of the vertical wall portion 14.

The caliper 30 includes a hydraulic cylinder part 1 in which a piston (not shown) is fitted at the base end.
Arms 6 and 8 are integrally provided on both sides.

Pin 1 extending from support 13 into pin hole 7 provided in arm 6
The portion where the pin 10 is inserted and the pin 10 is pulled out from the pin hole is covered by a flexible dustproof boot 12.

The arm 8 has a pin hole into which an elastic ring 9 made of rubber or the like is fitted, and a pin 11 extending from the support 13 is inserted into the pin hole.
is inserted.

In this way, the caliper 30 is slidably guided and supported relative to the pins io and ii of the support 1301 pair.

The central part of the caliper 30 straddles the outer periphery of the brake disc 15,
The friction pads 18, 190 are provided with holes 3 for inspecting the wear state.

The distal end side of the caliper 30 is bifurcated and extends downward, and is provided with a reaction force piece 4 that abuts against the back plate 21 of the friction pad 19.

The normal rotation direction of the brake disc 150 is the direction of arrow a, and the braking torque reaction force received by the friction pad 19 is caused by the protrusion 17.
a and is supported by the horizontal plate portion 16 of the support 13.

Similarly, the braking torque reaction force of the friction pad 18 is supported by the vertical wall portion 14 of the support 13 via the protrusion 22a.

An anti-vibration spring device 25 is installed between the rear plate 17 and the back plate 21 in the rotational direction of the brake disc 150.

As shown in FIG. 5, this anti-vibration spring device 25 is constructed of a corrosion-resistant spring steel plate by press molding.

The central part of the elongated plate is curved to form an end piece 28 that engages with the notch 21a of the back plate 21 on one end side from the curved part 29, and a notch is provided on the other end side to form a 35-strip end piece 26°26. .2
7, the central end piece 27 has a bent part 27b at its base end or root, is pushed out toward the end piece 28 side, and is further bent at a right angle to form a bent part 27a.

The curved portion 29 has a wide width, whereas the end piece 28 has a wide width.
It is narrowed so as to engage with the notch 21a of No. 1.

Further, as is clear from FIG. 4, the width of the central end piece 27 is somewhat narrower than the thickness of the protrusion 17 of the support 13, and the bent portion 27a.

27b is configured to sandwich both end walls 32 (wall surfaces parallel to the friction surface of the brake disc 15) of the protrusion 17, and the pair of side end pieces 26 are configured to sandwich both the front and back surfaces 31° 31a (braking circle) of the protrusion 17. Board 1
5).

In this way, the anti-vibration spring device 25 is attached to the protrusion 17 and supported so that the back plate 21 does not move in the circumferential direction and radial direction of the brake disc 150.

Similarly, a leaf spring 25a is also interposed at the engagement portion between the protrusion 22 of the vertical wall portion 14 and the back plate 20 of the friction pad 18.

Next, the operation of the device of the present invention will be explained.

When the vehicle is moving forward, the braking plate 15 rotates in the direction of arrow a.

When the brake is activated, pressure fluid flows from the fluid port 5 into the cylinder section 1.
A piston (not shown) protrudes and the back plate 20
At the same time, the friction pad 18 moves to the right in FIG. 1 and is frictionally engaged with one of the friction surfaces of the brake disc 15.

At the same time, the caliper 30 is pinned to the left due to the hydraulic reaction force.
o, ii, and the friction pad 19 is frictionally engaged with the other friction surface of the brake disc 15 together with the back plate 21 by the reaction piece 4 of the caliper 300.

In this way, the brake disc 15 is connected to a pair of friction pads 18.
, 19, and receives braking force.

The friction pads 18, 19 are subjected to forces that tend to drag them in the direction of rotation of the brake disc 150.

The braking torque reaction force received by the friction pads 18 and 19 is caused by the protrusion 2.
It is supported by the support 13 via 2a and 17a.

The gap provided between each back plate 21, 20 and the protrusion 17, 22 of the support 13 is the vibration prevention spring device 25, 25a.
Therefore, when the brake is applied, the friction pads 19 and 18 are held at the maximum by the brake disc 15.
No rattling is caused.

When the vehicle is moving backwards, the brake disc 15 rotates in the direction opposite to the arrow a in FIG.
The braking torque reaction force received by the support member 8 is transmitted to the support 13 through the back plate 2L20 and the anti-vibration spring devices 25 and 25a.

At this time, the anti-vibration spring devices 25, 25a flex and allow the friction pads 19,18 to move in the direction of rotation of the brake disc 150.

That is, the notch 21a of each back plate 21.20 is the protrusion 17a,
It is separated from 22a and serves to prevent this part from rusting or to peel it off.

When the friction pads 18 and 19 are worn out and need to be replaced, the guide pin 11 screwed onto the support 13 is removed, and the caliper 30 is pulled up toward the outer periphery of the brake disc 15 around the other guide pin 10. When rotated like this,
The friction pad 19 supported by the support 13
Move to the right in the figure and remove it from the protrusions 17, 17a,
It can be pulled up through the recess 33 of the support 13.

There is a sufficient gap between the protrusion 17 and the notch 21a of the back plate 21, and by sufficiently bending the anti-vibration spring device 25, the back plate 21 can be easily moved.

The curved portion 29 of the anti-vibration spring device 25 has a sufficiently wide width and is bent toward the protrusion 17 so that the support 13
is accommodated in the recess 33 of the back plate 21, so that movement of the back plate 21 is not hindered.

The force that the anti-vibration spring device 25 exerts on the back plate 21 is expressed by the equation 2 (
The friction pad is designed to sufficiently suppress vibration of the friction pad against acceleration (acceleration due to gravity).

According to the present invention, as described above, in the anti-vibration spring device, one end of the U-shaped leaf spring is engaged with the notch in the back plate, the other end is divided into three strips, and the central end piece is The protrusion of the support is bent so as to sandwich both end walls, the end pieces on both sides are configured to sandwich both the front and back sides of the protrusion, and are arranged on the rear side in the normal rotation direction of the brake disc. Therefore, it is possible to prevent the friction pad from vibrating or rattling due to being dragged by the rotation of the brake disc.

When the brake disk is reversed, the back plate moves against the force of the anti-vibration spring device when the brake is activated, thereby preventing the back plate from rusting on the protrusions of the support.

According to the present invention, the anti-vibration spring device can be easily formed from a leaf spring by press molding, and can be easily assembled to prevent movement in the axial and radial directions of the brake disc relative to the support. The excellent effect is that the friction pad can be replaced or attached without having to remove it.

[Brief explanation of drawings]

Fig. 1 is a plan view of a disc brake equipped with an anti-vibration spring device according to the present invention, Fig. 2 is an enlarged plan view of the main parts thereof, and Fig. 3 is a longitudinal cross-section taken along the line ■■ in Fig. 2. Figure, 4th
The figure is a perspective view showing how the anti-vibration spring device is attached with the back plate of the friction pad removed from the guide protrusion, and FIG. 5 is a perspective view of the anti-vibration spring device. 1 = cylinder part, 2: bridge part, 4: reaction force piece, 10.1
1: Pin, 13: Support, 14: Vertical wall part, 15:
Braking disc, 16: Horizontal plate part, 17.17a: Projection, 1
8, 19: Friction pad, 20.21: Back plate, 25, 25
a: Anti-vibration spring device, 26: Side end piece, 27: Center end piece, 27a. 27b: bent part, 28: end piece, 29: curved part, 30:
Caliper.

Claims (1)

[Claims] 1 A protrusion is provided on the support adjacent to the friction surface of the brake disc and extends in a direction perpendicular to the friction surface, and a notch provided on the back plate of the friction pad is slidably engaged with the protrusion. In the disc brake, a vibration prevention spring device is disposed on the rear portion of the brake disc in the normal rotational direction to apply a spring force in a direction parallel to the friction surface of the brake disc, and the vibration prevention spring device In the prevention spring device, one end piece of a leaf spring curved into a U-shape is engaged with the notch in the back plate, the other end piece is divided into three strips, and the central end piece hits the protrusion on the support. The front and back surfaces of the protrusion are bent so as to sandwich both end walls of the protrusion that meet and are parallel to the friction surface of the brake disc, and a pair of both side end pieces are perpendicular to the friction surface of the brake disc. 1. A friction pad vibration prevention spring device for a disc brake, characterized in that it is configured to clamp a friction pad.