KR200186765Y1 - A noise damping apparatus of disk brake for passenger car - Google Patents

Abstract

The present invention relates to a noise damping device for a disc brake for a passenger car, comprising: a friction pad installed to be retractable so as to selectively contact a rotating disk; A support plate installed in the inlet groove of the caliper to guide the protrusion of the friction pad; And a damping member formed on the coating surface of the support plate facing the inlet groove to attenuate squeal noise generated by the friction pad sliding against the support plate.

Description

A noise damping apparatus of disk brake for passenger car}

The present invention relates to a disc brake for a passenger car, and more particularly, to a noise damping device for a disc brake for a passenger car for attenuating squeal noise generated by a friction pad contacting the disc by a piston action in a caliper. will be.

In general, a disc brake for a passenger car is a device that compresses a pad that operates by hydraulic pressure on a disc rotating with a wheel instead of a drum on both sides of the disc and brakes the wheel by its frictional force.

The disk brake has a good heat dissipation of the disk, can be prevented from fade, and there is no magnetic operation has the advantage that the braking force of the left and right wheels is stable, and easy to check and adjust. In addition, the disc brake is roughly divided into a counter piston type and a floating caliper type according to the number of cylinders installed in the caliper.

1 and 2 schematically show an example of a floating caliper disc brake.

As shown in FIGS. 1 and 2, the disc brake includes a disc 12 which is rotated together with a wheel not shown, a caliper 14 provided on one side of the disc 12, and a caliper 14. A piston 18 slid by hydraulic pressure in the cylinder 16 and inner and outer pads provided on both sides of the disk 12 so as to be in close contact with the disk 12 by the piston 18 so as to brake the wheel. 22,24).

As shown in FIG. 3 schematically illustrating components of a fully-movable (FS-type) caliper according to the prior art, protrusions 23 and 25 are formed at both ends of the friction pads 22 and 24, and calipers. Inside the 14, a support plate 30 having a predetermined shape for smoothly sliding the friction pads 22 and 24 is provided. The support plate 30 may have various shapes according to the type of the vehicle or the friction pads 22 and 24. In addition, a predetermined interval for assembling the friction pads 22 and 24 is maintained between the support plate 30 and the tip ends of the protrusions 23 and 25 of the friction pads 22 and 24. Reference numeral 11 denotes a normal shim member.

By the way, according to the structure of the conventional disc brake, the friction pads 22 and 24 are in close contact with the disc 14 by high pressure, and slide with respect to the support plate 30 within a certain interval of tolerance, so-called sticks. A stick slip phenomenon occurs, and such a phenomenon causes the support plate 30 to vibrate, and squeal noise occurs due to such resonance phenomenon. Although the squil noise is also removed by shim members (not shown) provided on both sides of the friction pads 22 and 24, the influence is not intended to attenuate the resonance phenomenon of the support plate 30. There is a seriousness of the problem at this point.

The present invention has been conceived in view of the above problems, the disc brake for passenger cars with improved structure to attenuate the high-frequency squill noise caused by the vibration of the support plate itself installed inside the caliper for sliding of the friction pad The purpose is to provide a noise reduction device of the.

1 is a partial cutaway perspective view schematically showing an example of a floating caliper disc brake according to the prior art;

FIG. 2 is a sectional view of the disc brake shown in FIG. 1. FIG.

Figure 3 is an exploded perspective view schematically showing the components of the all-type (FS type) caliper according to the prior art.

Figure 4 is a cross-sectional view schematically showing a noise reduction device of a disc brake for a passenger car according to an embodiment of the present invention.

5 is a perspective view schematically showing a support plate portion according to a preferred embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

50 ... Noise damper 54 ... Disc 55 ... Protrusion

56.Friction pad 58 ... Caliper 60 ... Inlet groove

62 Support plate 66 Damping member 70 Support plate

72 ... contact

The present invention for achieving the above object, the friction pad is installed to be retractable to selectively contact the rotating disk; A support plate installed in the inlet groove of the caliper to guide the protrusion of the friction pad; And a damping member formed on a coating surface of the support plate facing the inlet groove to attenuate squeal noise generated by the friction pad sliding with respect to the support plate.

In the present invention, it is preferable that the damping member is coated with a silicone tape, rubber, a PT-FE film, a panol resin, an acrylic resin, etc., having the elastic force, after the heat treatment on the coating surface.

Hereinafter, with reference to the accompanying drawings, a noise damping device for a disc brake for a passenger car according to a preferred embodiment of the present invention will be described in detail.

4 is a cross-sectional view schematically showing a noise reduction device of a disc brake for a passenger car according to a preferred embodiment of the present invention.

As shown in FIG. 4, the noise reduction device 50 of the disc brake for a passenger car according to the present embodiment includes a friction pad 56 and a friction pad 56 installed to selectively contact the rotating disk 54. Squeal noise generated by the support plate 62 installed in the inlet groove 60 of the caliper 58 and the friction pad 56 sliding against the support plate 62 so as to guide the movement. A damping member 66 formed on the coating surface (64 in FIG. 5) of the support plate 62 facing the inlet groove 60 to attenuate it.

The outer circumferential surface of the disk 54 is surrounded by a caliper 58 and extends from a wheel (not shown) to rotate with the wheel. Thus, the disk 54 corresponds to the drum of the drum type brake and is braked by a friction pad 56 acting on both sides thereof.

The friction pad 56 is bonded to a thin iron plate such as a back plate by bonding a high friction coefficient lining with an adhesive. In addition, the friction pad 56 is generally a mixed plastic material of a non-asbestos material and a resin, and contains a small amount of metal powder. Further, grooves (see 27 in FIG. 3) are drawn in to the friction surface of the friction pad 56 in contact with the disk 54. The groove 27 is used for checking the serviceability of the friction pad 56. A protrusion 55 is formed at the center of the tip end portion of the friction pad 56.

The caliper 58 is formed with an inlet groove 60 so that the protrusions 55 of the friction pad 56 can be drawn in and slide.

The support plate 62 is an inlet groove formed in the sliding carrier part (not shown) of the caliper 58 when the friction pad 56 is slid in the direction of the disk 54 by a pressure member (not shown) such as a piston. In order to reduce the contact frictional force of the friction pad 56, which is slid by surface contact at the 60 position.

As shown in FIG. 5 schematically showing the support plate portion according to the preferred embodiment of the present invention, the support plate 62 is one of the friction pads 56 disposed to face each other about the disk 54. It is integrally formed to guide the tip together. That is, the support plate 62 is provided with the support 70 and the contact part 72 extended from both sides of the support 70. A coating surface is formed on the rear surface of each contact portion 72, that is, the portion facing the inlet groove 60. The coating surface is a surface on which the damping member 66 is installed and may be formed on the entire rear surface of the contact portion 72. In the present embodiment, the damping member 66 is installed on the coating surface of the site where the resonance phenomenon occurs in the protrusion part 55 of the friction pad 56.

The inlet grooves 60 are formed in pairs on both sides of the caliper 58 so as to face each other with respect to the center of the caliper 58, and the support grooves 62 are installed in the inlet grooves 60, respectively. Therefore, the pair of support plates 62 have the same shape.

Preferably, the damping member 66 is a viscoelastic material having elasticity. For example, the damping member 66 may be formed on a coated surface with silicone tape, rubber, PT-FE film (poly tetra-fluoro ethylene film), acrylic resin, or phenol resin. Coating treatment. Here, the coating method is a primer treatment step of applying a thin thermosetting resin on the coating surface, and the process of bonding the silicone tape, rubber, PT-FE film described above for example, acrylic resin, panol resin It includes by the so-called after coating method to include.

Referring to the operation of the noise reduction device of the disc brake for a passenger car according to the preferred embodiment of the present invention having the above-described configuration is as follows.

The present invention can be applied to a semi-floating caliper (PS type), F or FS type all-in-one caliper.

The semi-floating caliper (PS type) is fixed to the torque plate via two pistons, the other end of the screw is fixed to the support bracket of the vehicle, the caliper is perturbed on the pin of the fixed torque plate, the force of the piston during braking The caliper is to move inward. When the operator presses the foot brake, the braking pressure causes the external friction pad to transmit torque to one pin with respect to the disc rotation direction. In addition, since the position of the internal friction pad is restricted by the recess of the torque plate, the reaction force during braking acts directly on the torque plate.

The F-type fully movable caliper slides and supports the cylinder to the mounting bracket, and transfers the piston force to the external friction pad by removing the arm from the cylinder. The FS-type fully movable caliper is provided with a caliper by two pins such as a main pin and a sub pin on a fixed torque member, and the caliper and two pins are integrally moved by the force of a piston. Therefore, since the reaction force of the braking friction force extends to the torque member in both the inner and outer friction pads, torque is not transmitted to the pins, and the brake drag phenomenon is relatively less because the perturbation part of the caliper (main pin, sub pin) is completely sealed.

The operation of this embodiment is described by taking an all-movement type (FS type) caliper as an example.

First, when the driver presses the pedal of the foot brake, the working oil of the mast cylinder (booster) operates the wheel cylinder through the pipe. Then, the pressure member is in close contact with the friction pad 56 toward the disk 54 by the oil pressure in the wheel cylinder. At this time, the piston seal (not shown) is twisted, the twisting member is in the original position due to the property that the seal is returned to its original position when the oil pressure is lost.

In this process, the friction pad 56 is slid by the support plate 62, and the support plate 62 is shaken and resonated by the sliding operation. This resonance causes squeal noise, which can be efficiently attenuated by the damping member 66 formed on the coating surface of the support plate 62. Here, the noise attenuation function of the damping member 66 may exhibit an excellent attenuation effect in the high frequency range of 5,000 hz to 22,000 hz.

This noise attenuation effect is also apparent in [Table 1] below.

[Table 1] below is the measurement of noise more than 2 Khz and more than 70 dB.

Noise generation frequency Total braking frequency Noise occurrence frequency If not coated after 578 1360 42.5% After coating 193 1359 14.2%

As described above, the noise reduction device of the disc brake for a passenger car according to the present invention has the following effects.

Squeal noise generated by the vibration of the support plate by sliding of the support pad and the friction pad of the disc brake can be effectively attenuated by a damping member provided on the coating surface of the support plate.

Claims (2)

A friction pad removably mounted to selectively contact a rotating disk; A support plate installed in the inlet groove of the caliper to guide the protrusion of the friction pad; And And a damping member formed on the coating surface of the support plate facing the inlet groove to attenuate squeal noise generated by the friction pad sliding against the support plate. Noise reduction device for disc brake. The method of claim 1, The damping member is a noise damping device for a disc brake for a passenger car, characterized in that the viscoelastic material such as silicone tape, rubber, PT-FE film, acrylic resin, phenolic resin having the elasticity is coated on the coating surface after heat treatment.