Importance

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Abstract

A brake having multiple actuators is provided. In one embodiment the brake includes a torque transmission assembly centered about a longitudinal axis, a hub that is rotatable about the axis, and first and second pressure plate assemblies that are axially movable relative to the torque transmission assembly and each other. The brake also includes a drive plate assembly responsive to axial movement of the first pressure plate assembly for braking the rotation of the hub relative to the torque transmission assembly. Springs urge the second pressure plate assembly in a first axial direction towards the first pressure plate assembly and the first pressure plate assembly towards the drive plate assembly thereby setting the brake. One actuator is used to urge the second pressure plate assembly in a second axial direction, opposite the first axial direction and away from the first pressure plate assembly, to thereby release the brake. Another actuator is used to again urge the first pressure plate assembly in the first axial direction to control braking torque. In another embodiment, a brake is provided having the above-mentioned torque transmission assembly, hub, first pressure plate assembly, and drive plate assembly. Multiple, axially-spaced actuators are used to urge the pressure plate assembly towards the drive plate assembly and to provide a greater range of braking torque.

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First Claim