Wedge actuated drum brake assembly

Details Wedge actuated drum brake assembly Wedge actuated drum brake assembly

B - Operations, Transporting

60

T

188/187

B60T 1/06 (2006.01) F16D 65/14 (2006.01) F16D 65/22 (2006.01)

Patent

CA 1203757

ABSTRACT OF THE DISCLOSURE A wedge actuated drum brake assembly uses a wedge-shaped actuating rod and a roller cage slidably mounted thereon to transmit actuating forces from a fluid pressure actuator to a pair of friction elements. The actuating rod and roller cage are provided with a compression spring between the rod and the roller cage and an extension spring between the roller cage and the housing within which the actuat- ing rod and roller cage are movably mounted. The extension spring opposes the compression spring during initial movement of the actuating rod to thereby cancel the spring forces acting on the cage. A flexible boot interconnects the rod and the wall of the housing and includes a bead that is clamped with the end coil of the extension spring between a shoulder on the housing and a portion of the fluid pressure actuator that extends into the housing.

411953

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