JPH0379820A - Disc brake device - Google Patents

Abstract

PURPOSE:To restrain a vibration of a pad member in the direction of its bending and a noise caused by opening/closing vibration of a caliper claw part by providing each back board of a pad member divided into two parts with mutual sliding contact in a parallel plane with a disc rotor in the middle of a yoke type claw part. CONSTITUTION:A stepped part 10e is formed at an inner end of a back board 10a of a first pad member 10, while a stepped part 11e corresponding thereto is formed at an inner end of a back board 11a of a second pad member 11, and both the stepped parts 10e and 11e are contacted mutually and slidably. According to this constitution, when an outer pad member 4 is pressed against a disc rotor 2, contact friction between both the stepped parts 10e and 11e restrains vibration of the outer pad member 4 in the rotation direction of the disc rotor 2, and accordingly an opening/closing vibration of a yoke type claw part 8 of a caliper 5 is restrained. A noise frequency of the pad member divided into two parts is thereby substantially reduced and generation of a noise caused by opening/closing vibration of the yoke type claw part 8 of the caliper 5 is also restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc brake device used in a vehicle.

(Prior Art) Generally, as a disc brake device used in a vehicle, one disclosed in Japanese Patent Application Laid-open No. 19730/1983 is known.

That is, a disc rotor that rotates together with the wheel, a pad member provided facing the disc rotor in between, and a caliper having a forked claw portion that presses the pad member against the disc rotor are provided. The pad member is provided across the forked claw portion of the caliper.

However, in the conventional disc brake device as described above, since the pad member is a single long member that spans between the forked pawls of the caliper, vibrations are likely to occur. A problem has arisen in that noise is generated. That is, since the pad member is one long piece, its rigidity is low in the direction perpendicular to the disc rotor, and when the pad member is pressed against the disc rotor, the pad member does not vibrate due to the friction between them. vibration in the direction in which the pad member bends),
The back plate of the pad member resonates at a frequency of 6 to 10 KHz.
There was a problem with annoying noises occurring in the vicinity.

Therefore, by dividing the pad member into two parts in the rotation direction of the disc rotor to increase the rigidity of each pad member and increasing the natural vibration frequency of the pad member, it is possible to increase the frequency from 6 to 1.
It is possible to move the noise around 0 KHz to a higher frequency band and reduce the vibration level.

However, when the pad member is divided into two parts as described above, as each pad member vibrates in the disc rotor rotation direction,
The caliper claws vibrate in the disc rotor rotational direction (the caliper claws vibrate opening and closing), and the relatively low frequency 4
Experiments have revealed that new noise occurs around ~6KHz.

(Object of the Invention) In view of the above-mentioned problems, the present invention eliminates noise in the vicinity of 6 to 10 KHz caused by vibrations in the bending direction of the pad member and noise in the vicinity of 4 to 8 KHz caused by opening/closing vibrations of the caliper claws. It is an object of the present invention to provide a disc brake device that can reduce both noise and noise.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention includes a disc rotor that rotates together with a wheel, a pad member that is provided oppositely with the disc rotor in between, and a pad member that is attached to the disc rotor. A disc brake device comprising: a caliper having a pressing forked claw portion, wherein the pad member is divided into two at the middle of the forked claw portion of the caliper, and each of the two divided pad members is The back plates are brought into sliding contact with each other in a plane parallel to the disc rotor in the middle of the forked claw portion.

(Effects of the Invention) As described above, by dividing the pad member into two, the present invention can suppress the generation of noise caused by the pad member bending and vibrating in a direction perpendicular to the disc rotor. By sliding the back plates of the two-part pad member into sliding contact with each other in a plane parallel to the disc rotor, noise caused by the opening/closing vibration of the caliper claws due to the vibration of the pad member in the disc rotor rotational direction is reduced. It is also possible to suppress the occurrence of

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a front view and a side sectional view of a disc brake device according to the present invention.

This disc brake device 1 includes a disc rotor 2 that rotates together with wheels (not shown).

An inner pad member 3 and an outer pad member 4 are disposed at positions facing both friction surfaces 2a+2b of the disc rotor 2, respectively, and the pair of pad members 3.4
A caliper 5 is disposed so as to straddle the.

The caliper 5 includes a cylinder portion 6, a piston 7 slidably fitted to the cylinder portion 8, and a forked claw portion 8.8 provided on the outer surface of the outer pad member 4. Further, below the inner pad member 3 and the outer pad member 4, flange portions 9a and 9b having both ends standing upwardly are provided.
The approximately U-shaped torque receiver is provided with members 9, 9, respectively, and each torque receiver has both flange portions 9 of member 9.
The inner pad member 3 and the outer pad member 4 are supported by a + 9 b so as to be movable parallel to the axis of the disc rotor 2 .

Further, the inner pad member 3 includes a back plate 3a and a pad 3b adhered to the surface of the back plate 3a. on the other hand,
The outer pad member 4 is composed of a first pad body 10 and a second pad body 11 that are divided into two with respect to the rotational direction of the disc rotor 2, and each pad body 10.11 is divided into two parts.
It consists of pads iob and ttb, each adhered to the surface of a.

At the lower end of each of the back plates 10a, lla, there is a flange izi projecting outward (towards the front in FIG. 1).

colic is formed in each case. Further, the torque receivers of each of the back plates 10a and lla are provided with recesses 10d and lids at the ends on the member 9 side, and the torque receivers are provided with the respective flange portions 9a of the member 9 (outer pad member 4 side). ,
Convex portions 9c+9d are provided on the inner surface of 9b, and the convex portions 9c and 9d are fitted into the concave portions 10d and 11d with damping members (not shown) interposed therebetween.

In the outer pad member 4, as shown in FIG. 3, the back plate 10a of the first band body 10 and the back plate 11a of the second hat body 11 are in sliding contact with each other at the boundary portion thereof. That is, the step foe is formed at the inner end of the back plate 10a of the first pad body 10, and the step foe is formed at the inner end of the back plate 10a of the second pad body 11.
At the inner end of fa, there is a stepped portion 11 corresponding to the stepped portion 10e.
e is formed, and the two stages ff1l Oel 11e are in slidable contact with each other.

Next, the operation of the disc brake device as described above will be explained.

When the outer pad member 4 is pressed against the disc rotor 2, the contact friction between the step portions 10e+11e of the back plate 10a of the first pad body 10 and the back plate Lla of the second pad body 11 causes the disc rotor of the outer pad member 4 to be pressed against the disc rotor 2. Since vibrations in two rotational directions are suppressed, opening/closing vibrations of the forked claw portion 8 of the caliper 5 are suppressed. As a result, as shown in FIG. 4, the noise frequency of the two-split pad (-dotted chain line) in this example is significantly reduced compared to the noise frequency of the pad that is simply split into two (dashed line). I understand that.

Further, when comparing the noise index, the noise index of the two-part pad (double-dashed line) in this example is lower than that of the pad that is simply divided into two (solid line). Furthermore, the graph shown in FIG. 5 shows the relationship between frequency and noise level, and it can be seen that the noise level around 6 kHz is significantly reduced.

As described above, according to this embodiment, since the vibration of the two-divided outer pad member 4 in the direction of rotation of the disc rotor 2 is suppressed, the forked pawl f of the caliper 5! ! The generation of noise accompanying the opening/closing vibration of 58 is suppressed.

It should be noted that the present invention is not limited to the structure of the above-described embodiment, but may have a structure in which the boundary portions of the two-divided outer pad member 4 come into sliding contact with each other; for example, as shown in FIG. A configuration as shown may also be used.

That is, in the embodiment shown in FIG.
and the back plate 111a of the second pad body 111.
A contact plate 112, which is a separate member, is provided at the boundary between the two parts, and the two parts are in sliding contact with each other via the corresponding plate 112. The corresponding plate 112 has one end 112a that is connected to the first pad body 11.
0, and the other end 112b side is fixed to the back plate 110a of the second
It is in sliding contact with the back plate 111a of the pad body 111.

In the embodiment shown in FIG. 6 as described above, the same effects as in the embodiment shown in FIG. 3 can be obtained.

[Brief explanation of drawings]

FIG. 1 shows a disc brake device according to the present invention. 2 is a sectional view of the same side, FIG. 3 is a side view showing one embodiment of the outer pad member according to the present invention, and FIGS. 4 and 5 are of the embodiment shown in FIG. 3. Figure 6 is a graph comparing the noise frequency, noise index, and noise level with the outer pad member simply divided into two parts.
FIG. 7 is a side view showing another embodiment of the outer pad member according to the present invention. 2... Disc rotor, 3... Inner pad member,
4... Outer pad member, 5... Caliper, 8...
- Forked claw portion, 10... first pad body, 11...
Second pad body.

Claims (1)

[Claims] A disc brake that includes a disc rotor that rotates together with a wheel, a pad member that is provided facing the disc rotor, and a caliper that has a forked claw that presses the pad member against the disc rotor. In the device, the pad member is divided into two parts at the middle of the forked claw part of the caliper, and each back plate of the divided pad member is arranged parallel to the disc rotor at the middle of the forked claw part. A disc brake device characterized in that the disc brakes are in sliding contact with each other within a plane.