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
2022-05-04
Patent
Electronic Resource
English
Linear Actuator System with Circumferentially and Axially Adjustable End Stop Assembly
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