| 摘要 |
Power brakes servo-motor dead movement control unit, and the servo-motor contains an external shield, a hollow piston axially movable inside the shield, the first elastic element to move the piston to its rear home position, in which the piston's bearing surface contacts delimiting surface of the external shield, a control pin situated on the piston's axis and supporting a plunger on the front end, the second elastic element to move the control pin to its rear home position, a flap valve tightly placed inside the hollow piston around the control pin, the third elastic element to move the flap valve forward until it contacts the first valve-seat, which is located on the plunger, when the control pin is in its rear home position and with the second valve-seat which is on the piston, when the control pin is moved forward beyond the dead movement, a fixed delimiting element in the piston's hollow, on which the plunger is supported when the control pin is moved forward, a swinging delimiting element with its end mounted to the fixed delimiting element and whose opposite end supports a calibrated limiter, whereas the rear home position of the control pin is determined when the plunger rests on the swinging delimiting element, and the calibrated limiter is supported on the mentioned delimiting surface in the shield characterized in that it has a unit created by mounting a plunger (28) in the piston (20) together with a control pin (30) that activates it, a flap valve (34), [à]<IMAGE>
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