| 摘要 |
A service brake actuator (1), preferably for a heavy road vehicle, comprises in a housing (3, 4) a fluid actuated piston (5) with a piston rod (6). A lock actuator (2) combined with the service brake actuator comprises an axially movable push rod (13) for actuating the piston (5), a rotatable screw rod (18) in self-locking thread engagement with the push rod for axially transferring the push rod, and an electric motor (25) for rotating the screw rod (18).
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