JPH0444901Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a vibration damping device for drum brakes used in vehicles and the like.

[Conventional technology and its problems]

Drum brakes are widely used as braking devices in motorcycles, automobiles, and the like. In a drum brake, one end of the left and right half-moon brake shoes is pivoted to an anchor pin on the brake panel, a brake cam is applied to the other end, and the brake cam is rotated to move the left and right brake shoes against a spring. It spreads outward and presses against the inner periphery of the brake drum, and uses friction to brake the brake drum. When the brake shoe is pressed against the brake drum to create friction, the friction generates vibrations. If this vibration matches the natural frequency of the brake drum or brake shoe, resonance will occur and the vibration will be amplified, causing unpleasant vibration noise. Resonance can be avoided by wrapping a strip around the brake drum or attaching weights to the brake shoe to change the natural frequency, but attaching weights to the brake shoe increases weight and is inconvenient. .

[Purpose of invention]

The object of this invention is to obtain a drum brake vibration damping device that suppresses the resonance that occurs during brake operation as described above and generates low vibration noise.

[Structure of the idea]

The present invention will be explained below with reference to embodiments shown in the drawings.

1 and 2 show an embodiment of the present invention. A lining 2 is stretched around the outer periphery of the left and right half-moon shaped brake shoes 1, and one end is rigidly supported on an anchor pin 4 planted in a brake panel 3. And the other end of the brake shoe 1 is
It is applied to a brake cam 5 that is pivoted to a brake panel 3, and is biased inward by a spring 6. When the brake cam 5 is rotated, the left and right brake shoes 1
is expanded outward against the spring 6, presses the lining 2 against the inner periphery of the brake drum 7, and brakes the brake drum 7 by friction. Therefore, in the present invention, the portions of the left and right brake shoes 1 that are pivotally supported by the anchor pins 4 are notched in an L-shape, and an elastic body 8 is provided on one side of the portions that are cut out in the L-shape and face each other.
In normal operation, the end surface of each brake shoe 1 is urged in the expanding direction by the elastic body 8, and when the brake is applied, the elastic body 8 is compressed on each end surface of the brake shoe 1. .

In this way, the brake load itself during brake operation is received by the rigid shaft support of the anchor pin 4, and the compressive load of the elastic body 8 that suppresses resonance is received by the L-shaped notch, which is separate from the rigid shaft support. It is designed to be received at the end.

3 to 5 each show other embodiments of the present invention, in which a groove 9 with a semicircular cross section provided at one end of the brake shoe 1 is fitted into an anchor pin 4 for pivot support. The rigid groove 9
This is the type of thing you would receive at 3, a holding groove 10 is provided separately from the groove 9, the elastic body 8 is held between the holding grooves 10 on both sides, and the compressive load of the elastic body 8 is transferred between the groove 9 and the separate holding groove 10. It is something to be received at. The one in FIG. 4 uses an elastic body 8 made of a bent spring plate instead of the rubber elastic body 8 in FIG. 3, and the compressive load of the elastic body 8 is
It is received by the end face of the brake shoe 1, which has a groove 9 and a separate holding groove 10 formed therein. 5 is an elastic body 8 made of a spring plate, the attachment part of the anchor pin 4 is fitted into the groove 9, and the outwardly extending parts of both ends are held between the end faces of the left and right brake shoes 1. , the compressive load of the extension of the elastic body 8 is received by the groove 9 and the end face of the separate brake shoe 1.

[Effect of invention]

In either embodiment, when the brakes are applied by expanding the left and right brake shoes 1 and pressing them against the inner circumference of the brake drum 7, the brake load is received by the rigid support part (shaft support, groove 9) of the anchor pin 4, The initial load of the brake is generated quickly without causing any loss to the brake load itself, and without being influenced by the elastic body 8, resulting in an improvement in the braking effect.

In addition, the compressive load of the elastic body 8 is applied to support parts (protective groove 10, brake shoe 1
With the improvement of the braking effect described above, the compression action of the elastic body 8 is ensured, the vibration of the brake shoe 1 is suppressed (resonance is also suppressed), and the generation of vibration noise is also reduced.

[Effect of idea]

As explained above, in this invention, the support part that rigidly supports the anchor pin and receives the brake load, and the support part that receives the compressive load of the elastic body are separated, so that when the brake shoe is expanded, ,
The strong elasticity of the elastic body supports the brake shoe and damps vibrations, suppressing resonance phenomena and reducing noise caused by vibrations. and,
Since the brake load is received by the rigid support portion, the initial load is generated quickly without any loss in the brake load, and the brakes can be applied with good effect and feel.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a front view, FIG. 2 is an enlarged exploded perspective view of main parts, and FIGS. 3 to 5 are exploded perspective views of main parts showing other embodiments of the present invention. 1...Brake shoe, 4...Anchor pin,
5... Brake cam, 6... Spring, 7... Brake drum, 8... Elastic body.

Claims (1)

[Scope of utility model registration request] On the anchor pin side of the left and right brake shoes of the drum brake, a rigid anchor pin support part that receives the brake load when the brake is activated;
A vibration damping device for a drum brake, characterized in that an elastic body support part that receives an elastic body compressive load during brake operation is provided separately from the anchor pin support part.