JPH0527369U - Brake shoe for drum brakes - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a brake shoe for a drum-type brake in which the vibration of the brake shoe, which is the cause of the brake squeal, is attenuated in all vibration generation directions and the suppression of the brake squeal is improved. That is. [Structure] A lining material 7 having a triangular cross-section and made of an inorganic fiber or the like as a base material is fixedly mounted on the shoe rim 2b with an inclined surface 7a as an upper surface, and fluorine is slidably abutted on the inclined surface 7a of the lining material 7. It is characterized in that a bracket 8 to which an elastic material 9 such as rubber is attached is fixed to the shoe web 2b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a brake shoe of a drum type brake having a vibration damping structure.

[0002]

[Prior Art]

 As shown in FIG. 4, a drum type brake of an automobile has a brake shoe 2 attached to a back plate 1 by a shoe hold down pin 3, and is expanded by a wheel cylinder 4 so as to be in pressure contact with a brake drum (not shown). The ring 5 separates the brake drum.

In the brake shoe 2, a shoe web 2b is integrally provided on a shoe rim 2a, and a brake lining 2c is attached to the shoe rim 2a.

When the brake shoe 2 is pressed against the brake drum to brake, the brake shoe vibrates with an amplitude of a constant frequency to generate a squeal of the brake. Brake shoes with damping structure are provided.

[0005]

[Problems to be solved by the device]

 The direction of vibration generated in the brake shoe is a vibration mode in which the shoe rim 2a is in the vertical direction as shown in FIG. 5, and as shown by the solid line A in FIG. The vibration mode is in the left-right direction as shown in FIG. 6, and the brake squeal occurs near the frequency of 1.8 KHZ as shown by the solid line A in FIG. The squeal of the brake can be effectively suppressed by attenuating the vibrations of both of them, but the brake shoe having the above-described known vibration damping structure can suppress the squeal of the brake by attenuating some vibration. However, it is not possible to effectively damp the combined vibration of the upper and lower vibration modes of the shoe rim 2a and the left and right vibration modes of the shoe web 2b.

An object of the present invention is to provide a brake shoe capable of damping vibrations generated in the brake shoe in all directions.

[0007]

[Means for Solving the Problems]

 The gist of the present invention to achieve the above object is to provide a shoe rim integrally provided with a shoe web and a brake lining attached to the shoe rim, wherein an inorganic fiber or the like is used as a base material on the shoe rim. A lining material with a triangular cross-section is fixed with the inclined surface facing upward, and a bracket to which an elastic material such as fluororubber that slidably contacts the inclined surface of the lining material is attached is fixed to the shoe web. Is.

[0008]

[Action]

 With the above configuration, the inclined surface of the lining material fixed on the shoe rim and the elastic material attached via the bracket fixed to the shoe web relatively slide to move in all directions of the shoe rim and the shoe web. It attenuates the vibration of the and effectively reduces the squeal of the brake.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 2 denotes a brake shoe, which has a structure in which a shoe web 2b is integrally provided on a shoe rim 2a, and a brake lining 2c is attached to the shoe rim 2a. 6 is a vibration damping mechanism which is a feature of the present invention.

As shown in FIG. 3, the vibration damping mechanism 6 has a lining material 7 having a triangular cross section fixedly mounted on the shoe rim 2a as shown in FIGS. 1 and 2 with its inclined surface 7a facing upward. . It is appropriate that the lining material 7 is fixedly installed at four left and right positions on both sides of the shoe web 2b with the shoe hole down pin insertion holes 2d in between.

The lining material 7 is made of an inorganic fiber such as glass fiber similar to the brake lining 2c, a semi-metallic type based on a metal wire, a metallic type, or an asbestos resin mold type containing a friction modifier. A material that withstands surface pressure, high load and high temperature is selected.

Further, an elastic material 9 such as a fluororubber slidably abutting on the inclined surface 7 a of the lining material 7 is attached to the bracket 8, and the bolt 10 is attached to the shoe web 2 b corresponding to the fixed position of the lining material 7. It is a fixed structure.

Since the present invention has the above-described structure, the shoe rim 2a shown in FIG. 5 vibrates when the elastic material 9 and the lining material 7 slide relative to each other on the inclined surface 7a in the direction of arrow a in FIG. The vibration of the shoe web 2b shown in FIG. 6 is damped by the elastic material 9 and the lining material 7 sliding relative to each other on the inclined surface 7a in the direction of arrow B in FIG.

As shown by the dotted line B in FIG. 7, the vibration damping effect is 8 dB less than that in the conventional case in the vicinity of the frequency of 1.5 KHZ in the shoe rim 2 a, and in the shoe web 2 b as shown by the dotted line in FIG. In addition, it was found as a result of the experiment that the frequency is attenuated by 7.5 dB in the vicinity of 1.8 KHZ.

Therefore, the combined vibration of the shoe rim 2a and the shoe web 2b is naturally damped by the vibration damping mechanism 6, and the reduction of brake squeal is improved.

[0016]

[Effect of the device]

 As described above, according to the present invention, a lining material having a triangular cross section made of an inorganic fiber or the like as a base material is fixedly mounted on the shoe rim with the inclined surface as the upper surface, and slidably abutted on the inclined surface of the lining material. Since the bracket to which the elastic material such as fluororubber is attached is fixed to the shoe web, the vibration unique to the shoe rim and the shoe web can be effectively damped, and it is possible to obtain it with the conventional brake shoe having a vibration damping structure. It has the advantage of dampening the brake shoe vibration that could not be achieved and improving the brake squeal suppression effect.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is an end view of the present invention.

FIG. 3 is a perspective view of a vibration damping mechanism.

FIG. 4 is a structural diagram of a drum brake.

FIG. 5 is a diagram showing a vibration mode of a shoe rim.

FIG. 6 is a diagram showing vibration modes of shoe webs.

FIG. 7 is a comparative diagram of the vibration frequency of the shoe rim between the conventional and the present invention.

FIG. 8 is a comparative diagram of the vibration frequency of the shoe web between the conventional and the present invention.

[Explanation of symbols]

 2 Brake shoe 2a Shoe rim 2b Shoe web 6 Vibration damping mechanism 7 Lining material 7a Inclined surface 8 Bracket 9 Elastic material

Claims (1)

[Scope of utility model registration request] 1. A brake shoe in which a shoe web is integrally provided on a shoe rim, and a brake lining is attached to the shoe rim, and a lining material having a triangular cross section made of an inorganic fiber or the like as a base material is provided on the shoe rim with an inclined surface as an upper surface. A brake shoe for a drum-type brake, wherein a bracket having an elastic material such as fluororubber slidably abutting on the inclined surface of the lining material is fixed to the shoe web.