An actuator provided with a motor for moving an output arrangement, the actuator including both an output lever and a fusible connection that acts up to a mechanical torque threshold to constrain the output arrangement and the output lever to move together in rotation about an axis of rotation. The actuator also includes a fluid damper device housed between the output lever and the output arrangement to act, following rupture of the fusible connection, to damp movement of the output lever relative to the output arrangement in rotation about the axis of rotation.

Provided is a rotary damper configured so that specifications can be easily changed and favorable economic performance can be provided by continuous use of a typical rotary damper. The rotary damper (100) includes a housing (101) and a turning characteristic defining unit (140). The housing (101) has an inner chamber (103) housing a movable vane (132) of a rotor (130) and fluid (170). The housing body (102) has first externally-communicable paths (110) to (113) and second externally-communicable paths (114) to (116) communicating with an outer surface of the housing body (102). The turning characteristic defining unit (140) has, in a unit body (141), turning characteristic definers (160) to (163) defining turning characteristics of the rotor (130) and first definer communication paths (150) to (153) and second definer communication paths (154) to (156) causing the turning characteristic definers (160) to (163) and an outer surface of the unit body (141) to communicate with each other.

Provided is a damper device capable of increasing torque of a coil spring without increasing an outer diameter of a case. The damper device includes the case (2), a shaft (3) that is relatively rotatable with respect to the case (2), fluid filled in a damper chamber (5) formed between the case (2) and the shaft (3), a bearing member (4) that forms a partition wall (5a) that closes one end of the damper chamber (5) in an axial direction and is separate from the shaft (3), and a coil spring (9) having one end connected to a side of the case (2) and the other end connected to the shaft (3) or the bearing member (4) to apply torque to the shaft (3) with respect to the case (2). The bearing member (4) is arranged between a winding portion (9a) of the coil spring (9) and the damper chamber.

Provided are a volume change compensation device capable of reducing a manufacturing burden with a simple configuration and a damper device including the volume change compensation device. A damper device 100 includes a rotary damper, and includes a volume change compensation device 140 in a shaft 121 of a rotor 120. The volume change compensation device 140 includes an inner cylinder piston 142 pressed by an inner cylinder piston pressing elastic body 145 in a body tube 141 communicating with a hydraulic fluid housing portion 103 of the damper device 100 through a connection path 141a. The inner cylinder piston 142 is formed in a bottomed cylindrical shape opening on a connection path 141a side. In the inner cylinder piston 142, an inner cylinder inner small piston 143 is pressed against a bottom portion 142b by a small piston pressing elastic body 144. An air hole 142c is formed at the bottom portion 142b of the inner cylinder piston 142. The inner cylinder inner small piston 143 slides in the inner cylinder piston 142 according to the amount of hydraulic fluid 150 in the inner cylinder piston 142.

A rotation damper has a housing, a magnetic field source and a damper shaft designed as a hollow shaft, and a coupling rod arranged inside the damper shaft. The hollow shaft and the coupling rod form interacting transmission units and convert a relative axial movement of the coupling rod into a rotational movement of the hollow shaft. A displacer unit is arranged in the housing. The displacer unit includes the damper shaft and meshing displacer components that are rotatable in relation to each other. The displacer unit contains a magnetorheological fluid as the working fluid and can be operated thereby. The magnetic field source is configured for applying a magnetic field to the displacer components in order to dampen a rotational movement of the damper shaft.

The fluid damper device (10) has the rotor (30) which is inserted to the bottomed cylindrical case (20) and the cover (60) which is fixed to the opening portion (29) of the case (20). The welding protrusions (80) which are to be welded to the cover (60) are formed on the inside circumferential surface of the case (20) and spaced out in the circumferential direction. On the other side (L2) in the axial (L) direction of the welding range (X), within which the welding protrusions (80) and the cover are welded together, the first outflow prevention portion (91L, 91R) is formed. On the other side (L2) of the first outflow prevention portion (91L, 91R) in the axial (L) direction, the arc-shaped step surface (76) which functions as the outflow regulation portion (95) is provided to regulate the resin protruded and prevented it from reaching the position of the R-ring (49).

A damping mechanism includes a chamber, a movable blocking member and a power assembly. At least part of the movable blocking member is located in the chamber and cooperates with an inner wall face of the chamber to encloses a damping fluid cavity; at least one of the chamber and the movable blocking member defines a damping fluid circulation port in communication with the damping fluid cavity; and the power assembly is abutted against the movable blocking member, and configured to drive the movable blocking member to move relative to the chamber to change volume of the damping fluid cavity.

A prosthesis device has a rotary damper and a displacing device with a magnetorheological fluid in a damper volume of a housing. Two partition units divide the damper volume into two or more variable chambers. The partition units include a partition wall connected with the housing and a partition wall connected with a damper shaft. Radial gaps are formed in the radial direction between the partition wall on the housing and the damper shaft, and between the partition wall on the damper shaft and the housing. An axial gap is formed in the axial direction between the partition unit, the damper shaft and the housing. The magnetic field of the magnetic field source passes through at least two of the gaps.

A rotary damper having a simple self-standing mechanism which does not cause an inconvenience such as bounce of an opening/closing member at an end of an opening operation of the opening/closing member such as toilet lid is provided. A rotary damper has a housing, a shaft, a vane, a sliding member, an O ring, and a cap as main components. A shaft portion, formed in a pressure chamber of the housing, includes a blade portion protruding in an axial direction of the shaft portion. A cutout portion is formed in a center portion between both ends of the blade portion. On another side surface of the blade portion, a first groove is formed in a circumferential direction from a base of the blade portion to the outer periphery of the shaft portion. A second groove is formed on the outer periphery of the shaft portion spaced from the first groove.

The disclosed invention relates to the mechanical engineering industry, in particular, transport, exercise and medical training machines or appliances. The rotary hydraulic damper has a body that is formed by two hermetically connected base members in the form of cups which are directed to each other by their open parts and installed on an axle and are suitable for reciprocal oscillations. Internal surfaces of the body form a cavity in which partitions with transfer holes are installed and divide the cavity into chambers at that one end of each partition is fixed in turn on an internal end face of one or another base member and opposite ends of the partitions remain free. The axle is unloaded and dampening takes place due to oscillations of the base members and transfer of working fluid from one chamber into another.