| 摘要 |
<p>In a pressure-responsive actuator, the inside of a case (27) is divided into first (36) and second (36) air chambers by a diaphragm (35), and a coil spring (39) is accommodated in the second air chamber (36) for exerting a spring force for urging the diaphragm (35) in a direction to decrease the volume of the first air chamber (36). A rod (48) is coaxially connected at one of opposite ends to a side of a retainer (38) mounted to a central portion of the diaphragm (35) on the side of the first air chamber (36) and at the other end to a tip end (49) of an arm (25) fixed at its base end to a driven shaft (24) rotatable about an axis perpendicular to a plane parallel to the rod. In this pressure-responsive actuator, the case (27) 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 (35) 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. <IMAGE></p> |
