Method for keeping inner and outer sides of brake shoes in balance and drum brake using same
A technology of drum brakes and holding brakes, which is applied in the direction of drum brakes, brake types, mechanical equipment, etc., to achieve the effect of increasing friction, increasing contact area, and prolonging service time
Inactive Publication Date: 2014-04-02
陆美仙
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Problems solved by technology
However, due to space constraints, the return spring is semicircular or the pull ring of other shapes is difficult to fit into another hole after fixing a brake shoe, and it is very inconvenient to disassemble.
Method used
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[0019] The following detailed description sets forth the invention by way of example and not limitation. Such as Figure four , Figure five The cam-type drum brake shown consists of a cam, a brake shoe and a brake shoe. Both ends of the brake shoes are provided with holes for installing fixed parts, and there are grooves facing outward near the holes. The upper and lower brake shoes are fixed by return springs, and the upper and lower rings of the return springs act on the fixed parts. , to protect the non-wearing of the static end parts such as support pins, and the two return springs are all fixed on one side of the plane where the axis of symmetry of the upper and lower brake shoes is located, resulting in the situation that the upper and lower brake shoes are tight on the outside and loose on the inside. A groove is set around the hole, the center line of the return spring is closer to the plane where the symmetrical axis of the two brake shoes is located, and the shaft...
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The invention provides a cam type drum brake for keeping inner and outer sides of brake shoes in balance. The drum brake is provided with two semicircular arc-shaped brake shoes, the movable ends of the brake shoes are matched with an idler wheel and the immovable ends of the brake shoes are provided with brake shoe shaft sleeves matched with a fixing device; holes for installing resetting springs are arranged in shoe diameters, and concave grooves are installed on the positions of the holes for installing the resetting springs at two ends of the shoe diameters of the brake shoes; the central lines of the resetting springs are retracted; by utilizing the shaft sleeves, the lengths of two sides of the shaft sleeves are not same by taking the straight line of the symmetrical axis of the brake shoes as the standard so that the state with dynamic inside and loosening outside of the brake shoes is eliminated and the inner and the outer sides of the brake shoe are kept in balance; and therefore, the abrasion of the friction plate is uniform, the use time of the friction plate is prolonged, the contact area is increased and the frictional force is increased.
Description
Technical field: [0001] The invention relates to an automobile part, in particular to a cam-type drum brake which maintains the balance between the inside and outside of the brake shoe. Background technique: [0002] The cam type drum brake consists of a cam, a brake shoe and a bottom plate. In the general cam type drum brake, the friction plate is riveted on the brake shoe, the brake shoe is connected with the return spring, and then fixed on the brake bottom plate. The stability of the brake shoe is the basis for ensuring a good braking effect. As seen on the market at present, there are two kinds of brake shoes that are more prevalent in cam type drum brakes. First, as shown in Figure 6, the return spring is directly fixed in the hole in the diameter of the shoe, and the hole is located on the plane where the two symmetrical axes of the upper and lower brake shoes are located. In this way, the force balance of the upper and lower brake shoes can be maintained. However...
Claims
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IPC IPC(8): F16D51/18
Inventor 陆美仙
Owner 陆美仙