Patent ID: 9616875
Date: 2017-04-11
CPC Classifications: B60T,F16D

Claim:
1. A piston stroke sensor arrangement for a brake unit, comprising: the brake unit comprising a piston, a piston tube, a spindle provided within the piston tube, and a collet provided on the spindle, the spindle extending within the piston tube from a first end of the piston tube to an opposing second end of the piston tube; and a proximity sensor supported on the brake unit, wherein the proximity sensor determines the location of the piston within the brake unit based on the position of the piston tube relative to the proximity sensor, wherein a groove is defined in an outer circumferential surface of the piston tube, and wherein, when the brake unit is in an applied position, the proximity sensor is directed towards the groove on the piston tube and does not detect metal of the piston tube, wherein, when the brake unit is in a non-applied position, the proximity sensor is directed towards a portion of the piston tube that does not include the groove and detects the metal of the piston tube, and wherein the piston tube is in direct contact with the piston so that, as the piston is moved within the brake unit, the piston tube and the spindle are also moved within the brake unit.