Provided is a shock absorber capable of improving the dimensional quality and ensuring the sealing performance of a seal ring. The shock absorber includes a cylinder, an outer tube, an intermediate tube, and a discharge passage defined between the intermediate tube and the cylinder, a reservoir defined between the intermediate tube and the outer tube. The intermediate tube includes, on its inner circumferential surface, a groove having a concave shape in cross section to be capable of accommodating a seal ring that closes the discharge passage. A relationship of θ1<θ2 is satisfied, where θ1 represents an angle formed between one side surface, out of both side surfaces of the groove of the intermediate tube, that is located on an axial end side of the intermediate tube, and a plane orthogonal to an axial direction of the intermediate tube, and θ2 represents an angle formed between the other side surface that is located on an axial center side of the intermediate tube and the plane.

A limiting passage (24) includes: a first communication section (26) that opens to a first liquid chamber; a second communication section (27) that opens to a second liquid chamber; and a main body flow passage (25) that is configured to provide communication between the first and second communication sections. At least one of the first and second communication sections includes a plurality of fine holes (31). A vortex chamber (25b) is disposed at a portion of the main body flow passage, which is connected to at least one of the first and second communication sections, is configured to form a swirling flow of liquid according to a flow velocity of liquid flowing from the other of the first and second communication sections, and causes the liquid of the swirling flow to flow out through the plurality of fine holes. A barrier wall (36a) in which the plurality of fine holes are formed extends in a direction across a vortex axis along a central axis (O2) of the vortex chamber. Among the plurality of fine holes, fine holes located on an inner side in a swirl radial direction across the vortex axis in a top view of the barrier wall have a lower flow resistance than fine holes located on an outer side in the swirl radial direction.

A core material for a shock insulation support, comprising, in parts by weight: steel shot of 150-300 parts, zirconia particles of 50-150 parts and rubber particles of 50-100 parts. Further provided are a shock insulation support comprising the core material, and a preparation method for the shock insulation support. The core material for a shock insulation support, and the shock insulation support dissipates earthquake energy by means of a dry friction energy dissipation mechanism, having high damping and excellent shock insulation performance.

A rotating leaf spring seal is disclosed. In various embodiments, the rotating leaf spring seal includes a first annular ring configured for positioning against a support structure; a hook section having an outer surface configured for sealing engagement with a tie shaft and an inner surface configured for receiving a hold down ring; and a spring section disposed between the first annular ring and the hook section.

A damping apparatus can be self-centering and include one or more pre-compressed and preloaded mechanical springs. A solar tracking apparatus can include a solar panel mounted on a rotating shaft, and a self-centering damping apparatus operatively connected to the rotating shaft to compensate for torque created when the solar panel is rotated at an angle to horizontal. A steering assembly for a zero-turn riding lawn mower can include a pair of steering levers and a self-centering damping apparatus operatively connected to the steering levers.

The fluid damper device (10) includes a rotor (30) inserted into a case (20) in a bottomed tube shape and a cover (60) fixed to an opening part (29) of the case (20). The inner peripheral face of the case (20) is formed with the welding protruded part (80) welded to the cover (60) in a part in a circumferential direction. As the flow-out prevention part (90), a second flow-out prevention part (92) is formed on the inner peripheral side of the welding protruded part (80) on the other side (L2) in the axial line (L) direction with respect to the welding range (X). A circular arc-shaped step face (76) functioning as a flow-out restriction part (95) is provided on the other side (L2) in the axial line (L) direction of the second flow-out prevention part (92) and the projected resin is restricted from reaching to the O-ring (49).

On an outer circumferential portion of a piston band, in a natural state before being disposed in a cylinder, a large diameter part is formed on a side close to a distal end portion of a piston rod or on a side far from the distal end portion, a medium diameter part having a diameter smaller than that of the large diameter part is formed on a side far from the distal end portion or on a side close to the distal end portion, and a small diameter part having a diameter smaller than that of the medium diameter part is formed between the large diameter part and the medium diameter part.

A flywheel device includes an enclosure, a top plate that fastens to the enclosure, where the top plate includes a first opening, and a cap, where the cap has a top side and a bottom side, which when fastened to the first opening forms a seal between the bottom side and the first opening, the bottom side including an o-ring groove configured to hold an o-ring, a grease channel concentric with the o-ring groove, and an inlet port configured to enable grease to flow into the grease channel.

A shock mitigator is provided for mitigating physical shock to a joined object. The shock mitigator includes a hollow body capable of being affixed to the object and having two ends defining a volume therein. A cavitating liquid is disposed in the hollow body volume. At least one end cap is slidingly disposed within the hollow body to seal at least one end thereof. When exposed to a physical shock the cavitating liquid changes phase from a liquid to a vapor, absorbing energy from the shock.

Solar tracker systems include a torque tube, a column supporting the torque tube, a solar panel attached to the torque tube, and a damper assembly. The damper assembly includes an outer shell surrounding an inner shell and defining an outer fluid channel. A piston is positioned within the inner shell and moveable relative thereto. A locking valve of the damper assembly includes a shaft extending into a chamber and a seal attached to the shaft. The shaft is selectively moveable axially within the chamber along an extension axis between an unsealed position in which the seal is spaced from a chamber wall and a flow path is defined that extends from within the inner shell, through the chamber, and to the outer fluid channel, and a sealed position in which the seal contacts the chamber wall and the locking valve obstructs the flow path.