JPS6157502B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in drum brakes, specifically, a brake shoe return and hold system in which a return spring and a hold-down spring of a brake shoe can be assembled in one place. Regarding downspring integral structure.

In conventional drum brakes, the return spring and hold-down spring of the brake shoe are each installed independently and separately in the brake shoe, which takes up space and requires time and effort to assemble, resulting in high costs. There were flaws.

The present invention was made in order to eliminate such drawbacks, and includes a pin that is attached to a bucking plate and inserted into a loose fit hole of the shew web, and a pin that is fixed to the pin at one end and the other end is attached to the inner surface of the loose fit hole of the shew web. The desired result is achieved by providing an integral assembly structure comprising an elastic body for show return that is brought into contact with the pin, and an elastic body for hold down that has one end locked to the pin and the other end brought into contact with the upper surface of the show web. It is a collection of.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on embodiments shown in the accompanying drawings.

As shown in FIGS. 1 and 2, a pin 2 is press-fitted into a small hole drilled in the backing plate 1, and this pin 2 is attached to a loose fitting hole 4 in a shew web 3.
It is inserted into.

The pin 2 is provided with a slot 6 in the axial direction from the end face facing the head 5, and a spiral spring 7, one end of which is inserted into the slot 6 and locked, is inserted into the loose fitting hole 4 of the shew web 3. It touches the inside.

This spiral spring 7 functions as a shoe return spring.

Further, a disc spring 8 is locked to the end of the portion of the pin 2 that protrudes from the loose fitting hole 4 of the shew web 3, and the other end of the disc spring 8 comes into contact with the upper surface of the shew web 3 and pushes it against the bucking plate 1. It acts as a hold-down spring.

The means for locking the disc spring 8 to the pin 2 is the pin 2.
The pin 2 is configured to be locked by a clip 9 which is fitted into a groove cut parallel to the shaft end face on the outer periphery of the pin 2 and attached to the pin 2.

The brake shoe return and hold-down spring integrated structure of the present invention configured as described above allows the brake shoe return spring and hold-down spring to be assembled integrally, so it can be installed compactly without taking up much space. ,
It is easy to assemble, and it has great industrial value, such as making the parts smaller and lighter, making it possible to reduce the weight and cost of the brake.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an integrated structure of a return and hold-down spring of a brake shoe according to the present invention, and FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1. 1...Buckking plate, 2...Pin, 3...
...Show web, 4...Playing hole, 6...Slot,
7... Spiral spring, 8... Belleville spring, 9... Clip.

Claims (1)

[Scope of Claims] 1. A pin that is attached to the backing plate and inserted into the loose fitting hole of the shoe web, and an elastic body for shoe return that has one end locked to the pin and the other end that abuts the inner surface of the loose fitting hole of the shoe web. and a hold-down elastic body whose one end is locked to the pin and whose other end is brought into contact with the upper surface of the shoe web. 2. The brake shoe according to claim 1, wherein the pin has a head and a slot provided in the axial direction from the end face opposite to the head, and is press-fitted into a small hole drilled in the backing plate. Integrated return and hold down spring structure. 3. The elastic body for sew return comprises a spiral spring whose one end is inserted into and locked in the slot of the pin and whose other end is brought into contact with the inner surface of the loose fit hole of the sew web, as described in claim 1 or 2. Brake shoe return and hold down spring integrated structure. 4. Claims 1 to 3 in which the hold-down elastic body is a disc spring that has one end locked to the end protruding from the loose fitting hole of the shew web of the pin and whose other end is brought into contact with the upper surface of the shew web. The brake shoe return and hold-down spring integrated structure according to any one of the above. 5. The disc spring according to any one of claims 1 to 4, wherein the disc spring fits into a groove cut in parallel to the shaft end face on the outer periphery of the pin and is engaged with a clip attached to the pin. Integrated brake shoe return and hold down spring structure.