A linear actuator 1 for an electrical-hydraulic braking system of a vehicle. The actuator comprises a ball screw drive 2 including a spindle 3, a piston 4, a profiled pipe 5 and a nut 6. A brushless DC motor 8 turns the spindle 3 via a torque transmitting coupling 9. The spindle 3 includes a v-groove (v-shaped groove g; fig. 3) and a retainer washer 10 is locked in the groove. The washer may be an elastic conical washer with three to six elastic legs (11; fig. 2) and a flat end face (f; fig. 2). Also claimed is a locking procedure for the linear actuator comprising powering the motor in a refill direction with a torque value determined based on the size of the nut and washer. This procedure may be done when the vehicle is parked and engine shut off after a zero-point detection. The washer may provide an axial end stop for the nut 6, which is able to hold the nut 6 in place on the spindle 4 against the force from the motor 8, meaning the zero-point does not have to be recalculated when the vehicle is restarted.
Linear actuator with axial end stop
04.05.2022
Patent
Elektronische Ressource
Englisch
Linear actuator system with circumferentially and axially adjustable end stop assembly
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