A redundant seal assembly for an aircraft shock absorber comprises a changeover unit and dual dynamic seals for sealing a fluid chamber formed between an inner member and an outer member of the shock absorber. The first dynamic seal functions as a primary seal, and the second dynamic seal functions as a backup seal in the initial operation of the shock absorber. A fluid passage is formed from the fluid chamber to the first dynamic seal. The changeover unit has a spool provided in the fluid passage. The spool has a channel that forms pat of the fluid passage. A changeover activator is movable to open and close the fluid passage at the spool to apply or remove the fluid pressure on or from the first dynamic seal so as to change over the functionality as the primary seal between the first dynamic seal and the second dynamic seal.

An electromagnetic valve unit held so as to be sandwiched between a receiving portion of a housing portion of control equipment and a pressing member includes a shoulder portion to be opposed to the receiving portion of the housing portion and an annular elastic member provided with a protruded portion to be inserted into a recessed portion formed at the shoulder portion. The annular elastic member is further provided with an annular deformation portion that is deformable in the axial direction so as not to press the protruded portion in the axial direction.

A piston of a magnetic rheological fluid shock absorber comprises a piston core that is formed from a magnetic material and is provided with a coil on the outer periphery thereof, and a ring body that is formed from a magnetic material, surrounds the outer periphery of the piston core. A flow path of the magnetic rheological fluid is formed between the ring body and the piston core. The flow path of the magnetic rheological fluid comprises a first flow path part having a predetermined cross-sectional flow area, and a second flow path part having a larger cross-sectional flow area than the predetermined cross-sectional flow area and a longer axial length than the coil to cover the outer periphery of the coil.

An object is to provide a cylinder device which can be used over a long period of time. The cylinder device includes a damper, a pump, a motor and an external tank. The damper has a cylinder, a first bracket, a piston, a piston rod and a second bracket. The piston is slidably inserted into an interior of the cylinder. The piston rod is inserted into the cylinder and connects the piston to an end located in the cylinder. The pump is disposed at one of right and left sides with respect to a central axis of the cylinder. The motor is disposed at the one side which is the same side as the pump with respect to the central axis of the cylinder. The external tank is disposed at the other side with respect to the central axis of the cylinder.

A front fork includes a pair of telescopic tube members and an upper bracket on an upper side and an under bracket on a lower side. The upper bracket and the under bracket couple vehicle body side tubes of the pair of tube members and couple the vehicle body side tubes to a vehicle body side. The upper bracket includes a pair of cap portions into which upper side opening portions of the vehicle body side tubes are inwardly inserted. The cap portions cover upper side openings of the tube members.

A fluid mount for a vehicle includes a main bush mounted on an outer circumferential surface of an inner pipe and to which an outer pipe is coupled so that a fluid-contained internal region is sealed, and a middle bush dividing the internal region into a front liquid chamber and a rear liquid chamber and configured to, when vibration is generated along an axial direction of the inner pipe, form a fluid path extending a vibration-generating direction to allow the fluid to selectively flow from the front liquid chamber to the rear liquid chamber or from the rear liquid chamber to the front liquid chamber in the internal region.

A diaphragm holder for an oleo-pneumatic-type shock absorber includes a tubular body made of thermoplastic material, having one end arranged to hold a diaphragm and an opposite end defining an arched bottom for withstanding pressure forces. An insert is housed in the bottom of the tubular body and is arranged to mechanically reinforce the bottom and to distribute the pressure forces evenly.

A rotary damper comprising a fixed structure, a rotor configured to rotate about an axis (R-R), and two opposing bellows. The bellows each extend between the rotor and the fixed structure and are attached thereto. The bellows each define a chamber for holding hydraulic fluid and are configured to expand and contract as the rotor rotates. The damper further comprises a damping orifice extending through the rotor or the fixed structure. The bellows are sealingly engaged around the damping orifice and the damping orifice permits fluid communication between the chambers defined by the bellows.

A damping apparatus, including a damping main arm, a base, a buffer assembly, and a coupling assembly. The front end of the damping main arm is designed to support and carry camera equipment. The base is rotatably connected to the rear end of the damping main arm. The buffer assembly is rotatably connected to the front end of the damping main arm and is configured to provide load damping. The coupling assembly includes a first connector, which is movably connected to the base, and a second connector, which is movably connected to the damping main arm. The coupling assembly forms a buffer zone among the damping main arm, the base, and the buffer assembly. When the damping apparatus pitches, the first and the second connectors swing slightly, thereby reducing variations in the movement stroke of the buffer assembly.

A grinding apparatus includes a spindle having a rotating shaft; a mount disk having an upper disk fixed to a lower portion of the rotating shaft, a lower disk fastened to the upper disk, and a plurality of vibration absorbing dampers fixedly supported between the upper disk and the lower disk that are fastened to each other; and a grinding wheel detachably mounted on the mount disk.