Patent ID: 11964641
Assignee: ZF ACTIVE SAFETY US INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A parking brake for a wheel rotor having a brake pad associated therewith, comprising:
a housing defining first and second passages;
first and second pistons provided in the respective first and second passages;
spindles threadably connected with each piston; and
a clutch unit connected to the spindles, the clutch unit having a first condition allowing relative rotation between the spindles and the pistons such that the pistons are axially movable within the passages and into engagement with the brake pad in response to hydraulic pressure applied to the pistons, the clutch unit having a second condition preventing relative rotation between the spindles and the pistons such that pistons remains engaged with the brake pad when hydraulic fluid pressure is removed from the pistons,
wherein for each spindle the clutch unit includes a hub rotatably connected to the spindle and roller bearings arranged around the hub, the roller bearings being spaced from the hub when the clutch unit is in the first condition to allow for rotation of the spindle, the roller bearings being urged against the hub when the clutch unit is in the second condition to prevent rotation of the spindle.