A rotary damper has a housing and a damper shaft rotatable in the housing. A damper volume contains magnetorheological fluid for influencing the damping of a damper shaft rotation relative to the housing. A partition wall on the shaft and a partition wall formed on the housing divide the damper volume into two variable chambers. A gap is formed between the partition unit of the housing and the damper shaft, and a gap is formed between the partition unit on the damper shaft and the housing. The magnetic field source includes a controllable electric coil for influencing the strength of the magnetic field and thus the strength of damping. A substantial part of the magnetic field of the magnetic field source passes through at least two of the gaps and influences the two gap sections in dependence on the strength of the magnetic field.

A chassis component has a rotary damper with a housing, a damper shaft rotatably accommodated thereat, a displacing device in the housing, and a magnetic field source. The displacing device has a damper volume with magnetorheological fluid to influence the damping of the rotary motion of the damper shaft relative to the housing. The damper volume is divided into variable chambers by a partition wall connected with the housing and a partition wall connected with the damper shaft. Radial and axial gaps are formed between the partition walls, the damper shaft and the housing. The magnetic field source has a controllable electric coil for influencing the strength of the magnetic field and thus the strength of damping. A substantial part of the magnetic field of the magnetic field source passes through the gaps and influences the gap sections in dependence on the strength of the magnetic field.

A rotary damper (1) has a first sealing ring (8a) and a first bushing (4a) which are located between a through-hole (23) of a circular cylindrical chamber (21) inside a case (2) and a lower end part (33a) of a rotor body (31) of a rotor (3), and a second sealing ring (8b) and a second bushing (4b) which are located between a through-hole (60) in a lid (6) and an upper end part (33b) of the rotor body (31). The first sealing ring (8a) has an outer peripheral surface (85) having a width in a direction of a center axis of the circular cylindrical chamber (21) and being pressed against an inner peripheral surface (220) of the through-hole (23), and an inner peripheral surface (84) having a width in the direction of the center axis of the circular cylindrical chamber (21) and being pressed against an outer peripheral surface (34) of the lower end part (33a), and the second sealing ring (8b) has an outer peripheral surface (85) having a width in the direction of the center axis of the circular cylindrical chamber (21) and being pressed against an inner peripheral surface (64) of the through-hole 961 (60), and an inner peripheral surface (84) having a width in the direction of the center axis of the circular cylindrical chamber (21) and being pressed against the outer peripheral surface (34) of the upper end part (33b).

Provided are a seal body capable of ensuring a high liquid tightness even upon operation of a rotor and a rotary damper including the seal bodies. A rotary damper 100 includes a housing 101. The housing 101 includes a rotor 130 in a housing body 102, and is closed with a lid 120. An inner chamber 103 of the housing body 102 is divided into four cells by fixed vanes 104, 105 and movable vanes 136, 137 provided at the rotor 130. The fixed vanes 104, 105 and the movable vanes 136, 137 include, at tip end portions thereof, fixed vane seal bodies 110 and movable vane seal bodies 140. At each of the fixed vane seal bodies 110 and the movable vane seal bodies 140, a cavity formation groove 112a, 112b, 142a, 142b and fluid guide grooves 114, 144 are formed at each side surface 111a, 111b, 141a, 141b.

A gyroscopic stabiliser for stabilising motion of an object, the gyroscopic stabiliser comprising: a support for attaching to the object whose motion is to be stabilised; a gimbal rotatably supported by the support to be rotatable around a first axis relative to the support; a flywheel rotatably supported by the gimbal to be rotatable around a second axis relative to the gimbal, the second axis being orthogonal to the first axis; and a rotary damper for damping rotation of the gimbal around the first axis relative to the support; wherein the rotary damper comprises: a chamber containing a damping fluid; a vane that is rotatable within the chamber and that is coupled to the gimbal; and a flow passage allowing flow of the damping fluid from the chamber on one side of the vane to the chamber on the other side of the vane when the vane is rotated, wherein the flow passage comprises a flow valve configured to provide substantially the same flow rate of fluid through the flow passage for different torques applied to rotate the vane.

Provided is a rotary damper on which the timing for generating a damping torque can be set freely. Groove-like bypass passages (805) that are longer in the circumferential direction than vanes (501) are formed in the upper surface (803) of a torque regulation plate (8) arranged on the bottom part (201) of a cylindrical circular chamber (200). When the rotor (5) rotates in a first rotational direction R1, if both end faces (508a, 508b) of the vanes (501) are positioned within a range of the respective bypass passages (805), each area (218) and the corresponding area (217) are communicated via the corresponding bypass passage (805), enabling movement of a viscous fluid (6) from the area (217) to the area (218). Subsequently, if the rotor (5) rotates further in the first rotational direction R1 and one or both of the end faces (508a, 508b) of each vane (501) is outside of the range of the corresponding bypass passage (805), each area (218) and the corresponding area (217) are not communicated via the corresponding bypass passage (805), and the viscous fluid (6) is unable to move from each area (217) to the corresponding area (218).

A rotary damper has a housing, a damper shaft rotatably held on the housing, a damper volume accommodated in the housing and which has a magnetorheological fluid as working fluid, and at least one magnetic field source in order to influence a degree of damping of the rotational movement of the damper shaft relative to the housing. A separating unit connected to the damper shaft divides the damper volume. At least one gap portion, which can be influenced by a magnetic field of the magnetic field source, is formed between the separating unit, which is connected to the damper shaft, and the housing. The housing, the separating unit and the magnetic field source are designed such that a flow cross section for the magnetorheological fluid from one side to the other side of the separating unit changes in dependence on a rotational angle.

A torque adjustment function-provided rotary damper capable of easily adjusting a torque without needing to use a tool, even in a case where a space cannot be secured on an end portion side of a casing. An adjustment lever is an operation member having an engagement portion and a knob portion. The engagement portion links with an adjuster by engaging with an adjustment end portion such that a cutout fits to a fitting portion. The knob portion is formed integrally with the engagement portion by protruding radially from an outer periphery side of a the casing. The knob portion extends to a guide portion along an axial direction of the casing in its outer periphery. The guide portion has a semi-ring shape which is partially cut out. The guide portion is rotatably disposed along an outer periphery of a shaft side cap that closes an end portion of the casing.

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.

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).