Clamp tool for machining outer circle and two side end faces of brake shoe

Abstract

The invention relates to a clamp tool for machining the outer circle and the two side end faces of a brake shoe, and belongs to the technical field of brake shoe production and machining. The clamp tool comprises a front limiting disc and a rear limiting disc, a connecting column is arranged between the front limiting disc and the rear limiting disc, a cavity is formed in the connecting column, amovable buckling block is arranged in the cavity, the movable buckling block can move in the radial direction and the axial direction of the connecting column, the movable buckling block makes contactwith or is separated from an arc-shaped rib plate on the inner side of a brake shoe workpiece, a fixed convex edge is arranged between the cavity and the rear limiting disc, a fixing column is arranged on the side, close to the connecting column, of the rear limiting disc, a shaft sleeve hole of the brake shoe workpiece is inserted into the fixing column, anti-skid sleeve is arranged on the outerside of the fixing column, and a plurality of positioning bosses are arranged in the circumferential directions of the front limiting disc and the rear limiting disc. According to the clamp tool, according to the shape design of the brake shoe, two brake shoe workpieces can be fixed at the same time, and subsequent machining is conducted; and due to the action of the fixing column and the movablebuckling block, it can be guaranteed that the brake shoe workpiece is stably placed in the tool, and deviation cannot occur in the machining process.

Description

technical field [0001] The invention relates to a clamp tool, in particular to a clamp tool for processing the outer circle of a brake shoe and the end faces on both sides, and belongs to the technical field of brake shoe production and processing. Background technique [0002] Although drum brakes are generally less expensive than disc brakes, drum brakes may suffer from inconsistent brake dynamics, control, and performance compared to conventional disc brakes. For example, drum brakes have a self-energizing feature. During braking, rotation of the brake drum exerts a force that urges the leading shoe into engagement with the braking surface of the brake drum (while urging the secondary shoe out of engagement with the braking surface of the brake drum). This feature often results in the application of a greater braking force than expected under low speed conditions, and less than expected under high speed conditions, and is particularly pronounced when using friction mater...

AI Technical Summary

Problems solved by technology

Furthermore, this feature results in an uneven braking force exerted by the leading and trailing shoes, wherein the difference in the braking force exerted by the brake shoes increases with increasing coefficient of friction

This feature also leads to uneven wear on the brake shoes

The machining accuracy of the outer end surface of the brake shoe is directly related to the degree of wear between the brake shoe and the brake pad. If the machining error is large, the outer end surface of the brake shoe will be uneven, which will cause the contact surface between the outer end surface of the brake shoe and the brake pad. Unevenness shortens brake pad life

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