Provided is a damper wherein viscous fluid which fills a circular cylinder chamber is more reliably prevented from leaking. A rotary damper (1) includes: a first seal ring (8a) of an elastic body, arranged between a through-hole (23) of a circular cylinder chamber (21) in a case (2) and a lower end of a rotor body of a rotor (3); and a second seal ring (8b) of an elastic body, arranged between a through-hole (60) in a lid (6) and an upper end of the rotor body. The first seal ring (8a) has: an outer peripheral surface with a width in a direction of a center axis of the circular cylinder chamber (21), which is pressed against an inner peripheral surface of the through-hole (23); and an inner peripheral surface with a width in the direction of the center axis of the circular cylinder chamber (21), which is pressed against an outer peripheral surface of the lower end of the rotor body, and also a second seal ring (8b) has: an outer peripheral surface with a width in the direction of the center axis of the circular cylinder chamber (21), which is pressed against an inner peripheral surface of the through-hole (60); and an inner peripheral surface with a width in the direction of the center axis of the circular cylinder chamber (21), which pressed against an outer peripheral surface of the upper end of the rotor body.

The present invention enables a simple structure to provide an easy adjustment of damping torque to be caused by applied rotation.

The rotary damper (1) is intend to limit movement of viscous fluid filled in a circular cylindrical chamber (111), thereby generating a damping torque in response to an applied rotational force. The lid (15) is the screw-on type capable of being screwed into the casing (11), and thus adjusting a clearance gap G1 between the lid (15) and each partition (115) by way of changing the screwing amount of the lid (15) into the casing (11) allows amount of viscous fluid moving through the clearance gap G1 to be adjusted, thereby resulting in adjustment of a damping torque to be caused by rotation. In addition, each axial force generation member (17) includes a plastically or elastically deformable element and is located between the lid (15) and the corresponding partition (115) to apply a reaction force to the lid (15). This causes screwing the lid (15) into the casing (11) to generate an axial force, thereby preventing external-leakage of the viscous fluid via a threaded interface between the lid (15) and the casing (11), and allows the leeway for the adjustment of the clearance gap G1 to increase.

The present invention relates to, among other things, a rotational damper comprising a fluid-filled damper housing and within the damper housing a piston rotatably accommodated by a rotation axis of the rotational damper in a first direction and an opposite second direction with a piston rod extending in the direction of the rotation axis; whereby the piston has at least one opening with a flow cross-section which allows for the flow of fluid through the piston, whereby a total flow cross-section is calculated as the sum of the flow cross-sections of the at least one opening. A blocking device can be furthermore assigned to the piston which is capable of reducing the flow cross-section of at least one of the openings during a rotation of the piston in a first direction relative to a rotation of the piston in the second direction.

An isolator comprising a pulley having a pulley stop, a plate attached to the pulley, a shaft, the pulley journalled to the shaft, a torsion spring attached to the shaft, a damping member attached to the torsion spring, the damping member disposed between the plate and the pulley, and the damping member compressing a damping fluid against the pulley stop.

A device for influencing the force of a seatbelt acting on an occupant of a passenger vehicle during a collision, for example. The device includes a rotary damper with a magnetorheological fluid as a working fluid for damping a rotational movement of a damper shaft of the rotary damper when winding or unwinding the seatbelt. The rotary damper has a displacing device with displacing components which engage into one another and which are wetted by the magnetorheological fluid. By using a paired controller, a magnetic field of a magnetic field source with an electric coil can be controlled and the magnetorheological fluid can be influenced in order to adjust the damping of the rotational movement of the damper shaft.

A damped hinge assembly for mounting a first member for rotational movement relative to a base member about a hinge axis is provided. The assembly includes a first linearly acting damping device, and first camming means for converting rotational movement of the first member in a first direction into linear actuation of the first damping device to cause it to impart a damped resistive force to the first member over at least part of its movement in said first direction. The first damping device is mounted with its linear axis coincident with the hinge axis, with the first damping device acting as a fulcrum for said rotational movement of the first member.

Provided is a rotary damper that makes it possible to adjust braking torque characteristics. A rotary damper (1) that restricts the movement of a viscous fluid (6) with which the inside of a cylindrical chamber (200) of a case (2) has been filled and thereby generates braking torque against applied rotational force. A flow path (208) is formed in a partitioning part (204) of the cylindrical chamber (200), and a check valve (3) is movably arranged inside the flow path (208). When a rotor (4) has rotated in a normal rotation direction R1, the check valve (3) moves inside the flow path (208) in a closing direction M1 and closes the flow path (208) and, when the rotor (4) has rotated in a reverse rotation direction R2, moves inside the flow path (208) in an opening direction M2 and opens the flow path (208). The check valve (3) comprises a reaction force application part (302) that generates a reaction force against the check valve (3) when the check valve (3) has moved to a prescribed position in the closing direction M1.

Provided is a rotary damper that makes it possible to adjust braking torque characteristics. A rotary damper (1) that restricts the movement of a viscous fluid (6) with which the inside of a cylindrical chamber (200) of a case (2) has been filled and thereby generates braking torque against applied rotational force. A flow path (208) is formed in a partitioning part (204) of the cylindrical chamber (200), and a check valve (3) is movably arranged inside the flow path (208). When a rotor (4) has rotated in a normal rotation direction R1, the check valve (3) moves inside the flow path (208) in a closing direction M1 and closes the flow path (208) and, when the rotor (4) has rotated in a reverse rotation direction R2, moves inside the flow path (208) in an opening direction M2 and opens the flow path (208). The check valve (3) comprises a reaction force application part (302) that generates a reaction force against the check valve (3) when the check valve (3) has moved to a prescribed position in the closing direction M1.

Provided is a rotary damper that makes it possible to easily adjust braking torque. A rotary damper that has a partitioning part and first and second adjustment bolts. The partitioning part has: first and second flow paths that connect regions of a partitioned cylindrical chamber; a first insertion hole that connects to the first flow path and to a first adjustment bolt screw hole of a case; and a second insertion hole that connects to the second flow path and to a second adjustment bolt screw hole of the case. The first adjustment bolt is screwed into the first adjustment bolt screw hole and is thereby inserted into the first insertion hole, and the length to which it protrudes into the first flow path can be adjusted. The second adjustment bolt is screwed into the second adjustment bolt screw hole and is thereby inserted into the second insertion hole, and the length to which it protrudes into the second flow path can be adjusted.

Provided is a rotary damper that makes it possible to easily adjust braking torque. A rotary damper that has a partitioning part and first and second adjustment bolts. The partitioning part has: first and second flow paths that connect regions of a partitioned cylindrical chamber; a first insertion hole that connects to the first flow path and to a first adjustment bolt screw hole of a case; and a second insertion hole that connects to the second flow path and to a second adjustment bolt screw hole of the case. The first adjustment bolt is screwed into the first adjustment bolt screw hole and is thereby inserted into the first insertion hole, and the length to which it protrudes into the first flow path can be adjusted. The second adjustment bolt is screwed into the second adjustment bolt screw hole and is thereby inserted into the second insertion hole, and the length to which it protrudes into the second flow path can be adjusted.