| 摘要 |
In a pressure-responsive actuator, the inside of a case is divided into first and second air chambers by a diaphragm, and a coil spring is accommodated in the second air chamber for exerting a spring force for urging the diaphragm in a direction to decrease the volume of the first air chamber. A rod is coaxially connected at one of opposite ends to a side of a retainer mounted to a central portion of the diaphragm on the side of the first air chamber and at the other end to a tip end of an arm fixed at its base end to a driven shaft rotatable about an axis perpendicular to a plane parallel to the rod. In this pressure-responsive actuator, the case is provided with a tilt-restricting portion for restricting the tilt of the rod to a range in which the contacting of the diaphragm with the inner surface of the case can be avoided. Thus, the tilt of the rod is restricted so that the diaphragm is prevented from being brought into contact with the inner surface of the case. Therefore, the friction cannot be generated between the inner surface of the case and the diaphragm by the movement of the rod in a longitudinal direction, and the wear of the diaphragm can be prevented, leading to an enhancement in durability thereof.
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