FIELD: engines.
SUBSTANCE: invention relates to gearshift mechanism with servo drive. Pneumatic device support force connection gearbox includes housing (1) having inlet hole (24) for compressed air and outlet (48) for air. Pneumatic device also includes a control rod (17) and output unit (3) containing a working piston (12), which limits two pneumatic working space (14, 15). Between the control rod and an output unit there is a valve unit (23), wherein said pneumatic device contains two valve pistons (20, 21), two ring-shaped sealing edges (43), two interacting with said edges of valve spool valves (30, 31) and two valve seats (26, 27). To one of said valve pistons connected throttle (51), made with possibility of displacement relative to said piston has closing edge (58), interacting with appropriate valve seat, and limiting at least one throttle channel (49), cross section area of which depends on the throttle position relative to appropriate valve piston.
EFFECT: higher reliability of the device.
17 cl, 3 dwg
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