Patent ID: 6497172
Filing Date: 2002-12-24
Classification: F01C,F15B

Abstract:
A rotary actuator with a cushion mechanism comprising:a circular cylinder hole provided in a casing; a rotatable rotor provided in a center portion of said cylinder; one vane mounted to said rotor and swinging and rotating in normal and reverse directions within said cylinder hole; two packings mounted at different positions on said vane; a stopper defining a rotational terminal position of said vane; two pressure chambers formed between said vane and said stopper; two supply ports for supplying a compressed air to said pressure chambers; and an air pressure type cushion mechanism for stopping said vane at a rotational terminal end position in at least one of normal and reverse directions in a cushioning manner, wherein said cushion mechanism has a first opening for discharging an exhaust air pressed out from said pressure chamber by a rotating vane to an external portion without limiting a flow amount, a second opening for discharging the exhaust air to the external portion in a state of limiting a flow amount and a flow amount adjusting mechanism for limiting a flow amount, said flow amount adjusting mechanism being connected to said second opening, and wherein said first opening is provided at a position sealed between said two packings before said vane of a hole surface in said cylinder hole reaches a rotational terminal end position, said second opening is provided at a position which is not sealed between said packings after said vane reaches the rotational terminal end position, said first opening is connected to one of the supply ports by the through hole within the casing, and said second opening is connected to the same supply port via said flow amount adjusting mechanism.