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drum brake unit

A drum brake and parking brake technology, applied in the directions of hydraulic drum brakes, mechanically driven drum brakes, brake types, etc., can solve the problems such as the loosening of the shoe expansion force and the effect of preventing the easy reduction, so as to prevent the body from becoming larger, The effect of preventing loosening

Active Publication Date: 2021-01-19
AKEBONO BRAKE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a disadvantage that the elastic force of the compression spring decreases due to deformation of the output member, etc., and the loosening prevention effect of the shoe expansion force tends to decrease.

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0057] Such as figure 1 with figure 2 As shown, in the drum brake device 100 having the parking brake mechanism 31 according to the first embodiment of the present invention, the back plate 11 is integrally fixed to the vehicle body in a posture substantially perpendicular to the wheel rotation axis 13 . The back plate 11 is formed to have a predetermined strength by erecting an outer peripheral portion of a circular substrate made of a thick metal plate as a peripheral wall. Such as figure 2 As shown, a motor gear unit 15 for motorizing the parking brake is provided on the vehicle-side surface of the back panel 11 . On the side of the back panel 11 along the front-rear direction of the vehicle ( figure 1 A pair of arc-shaped first brake shoes 17 and second brake shoes 19 are arranged on the outer peripheral edges of the left and right sides).

[0058] The first brake shoe 17 and the second brake shoe 19 arranged on the back plate 11 are respectively fixed with a first w...

no. 2 Embodiment approach

[0085] Next, a second embodiment of the drum brake device according to the present invention will be described.

[0086] Such as Figure 7 ~ Figure 9 As shown, the drum brake device 200 having the parking brake mechanism 99 according to the second embodiment of the present invention is configured such that, in addition to the parking brake mechanism 99, the back plate 11, the anchor portion 37, the motor gear unit 15, the The drive member 45, the wheel cylinder 41, the return spring 35, and the tension coil spring 39 are basically the same as those of the drum brake device 100 according to the first embodiment described above. Therefore, in the following description, the parking brake mechanism 99 will be mainly described in detail, and the detailed description of other configurations of the drum brake device 200 equivalent to the drum brake device 100 described above will be omitted.

[0087] The parking brake mechanism 99 according to the second embodiment includes an expan...

no. 3 Embodiment approach

[0096] Next, a third embodiment of the drum brake device according to the present invention will be described.

[0097] Such as Figure 11 As shown, in the drum brake device 300 having the parking brake mechanism 117 according to the third embodiment of the present invention, the parking brake mechanism 117 is of a forward pull type. This drum brake device 300 is configured such that the basic structure of the back plate 11 , the anchor portion 37 , the wheel cylinder 41 , the return spring 35 and the tension coil spring 39 is the same as that of the drum brake device 100 described above except for the parking brake mechanism 117 . basically the same. Therefore, in the following description, the parking brake mechanism 117 will be mainly described in detail, and the detailed description of other configurations of the drum brake device 300 will be omitted.

[0098] Such as Figure 12 with Figure 13 As shown, the parking brake mechanism 117 according to the third embodiment...

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Abstract

The drum brake device (100) has a parking brake mechanism (31) including first and second brake shoes (17, 19), the pair of brake shoes being arranged in contact with the brake drum. The inner peripheral surfaces are respectively opposite and can be opened; the adjuster (33), which is installed between an adjacent end of the pair of brake shoes, and can automatically adjust the distance between the shoes; and the opening mechanism (43), the opening mechanism is installed between the first brake shoe (17) and one end of the regulator (33), and utilizes the thrust of the working rod (49) to which the external force is applied to make the first and second 2 brake shoes (17,19) open. Disc springs (97) are arranged on the adjuster (33), and the disc springs are bent along the opening direction of a pair of brake shoes during parking operation.

Description

technical field [0001] The present invention relates to drum brake devices. Background technique [0002] For example, in an automobile, the vehicle is stopped with the service brake, and then the parking brake is activated. When the service brake is released in this state, part of the braking force may disappear. This is because, when the parking brake is applied while parking on a sloping ground, and the service brake is released in this state, torque acts on the brake shoe, and due to elastic deformation between the components of the parking brake mechanism, the expansion The expansion force of the mechanism (opening mechanism) will decrease by a certain amount. This phenomenon is called a so-called loose stroke where a part of the braking force disappears. This loose stroke is particularly noticeable in a structure such as an electric parking brake that applies a pulling force to the operating rod of the expansion mechanism through a short output member, and may reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D65/56F16D51/22F16D65/22F16D121/24F16D125/40
CPCF16D51/22F16D65/22F16D65/563F16D2121/04F16D51/24
Inventor 吉川和宏
Owner AKEBONO BRAKE IND CO LTD