A hydraulic damper includes a cylinder containing a hydraulic fluid and a piston affixed to a piston rod that extends out from one end of the cylinder through an end cap seal and that divides the cylinder into two chambers. The piston includes a port extending longitudinally through it where the port defines a valve seat. Inserted in the port is a spring-loaded valve member having a central bore extending longitudinally through it of a selected diameter that sets the rate of extension and return of the piston rod during use.

The present invention relates to a piston rod end for absorbing forces on a linear actuator in a train coupler, the piston rod end comprising a housing (2) enclosing a cavity (23) with a bottom surface (24), the cavity (23) extending in a longitudinal direction in the housing (2), —an elongated insert (3) arranged at least partly inside the cavity (23) of the first portion (P), a spring (5) arranged inside the cavity (23), and a fastening device (4) comprising a transversal element (41) and a longitudinal slot (42) forming a play, one being arranged in the housing and the other in the insert, and configured to cooperate in such a way that the transversal element extends into the slot in a transversal direction in relation to the housing and is movable in the play. The invention also relates to a piston assembly and to a sealing method for sealing the piston rod end.

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 separation device for separating a working chamber and a compensation chamber of a hydraulically damping mount includes a first nozzle disc and a second nozzle disc made of a first material and forming a damping channel interconnecting the working chamber and the compensation chamber. The first nozzle disc may include a sealing member made of a second material and abut the second nozzle disc to seal the damping channel. A hydraulically damping mount for mounting a motor vehicle unit may having a separating device.

A method for sealing a liquid composite spring, includes the steps of: placing a sleeve-shaped outer wall around an upper portion of a core shaft, and forming an upper liquid chamber and a lower liquid chamber inside the outer wall; and arranging a sealing member at a bottom of the outer wall to seal the lower liquid chamber, wherein the sealing member is made of flexible material. The liquid composite spring is provided with the rigid outer wall and the flexible sealing member. The volume and shape of the lower liquid chamber can be changed through the flexible sealing member, so that the chamber is formed as a flexible chamber.

Provided are a magneto-rheological rotating load device and a method of controlling the same. A magneto-rheological rotating load device according to the present invention includes a housing, a yoke part disposed in the housing, a shaft rotatably installed in the housing, one or more rotary rings connected to the shaft and configured to rotate in conjunction with a rotation of the shaft, a coil part disposed in the housing, a magneto-rheological fluid with which at least a part in the housing is filled, a cover part disposed at an upper end of the yoke part, and a bearing part disposed to be in contact with an outer peripheral surface of the shaft and configured to support the rotation of the shaft, in which a leak prevention means configured to prevent a leak of the magneto-rheological fluid is at least provided between the bearing part and the cover part.

A sealing device for hydraulic equipment according to the invention includes an outer member having an annular shape, an inner member inserted into the outer member, and a seal ring housed in an annular groove disposed in the outer circumference of the inner member and abutting on the outer member to prevent a liquid from passing through a gap between the outer member and the inner member. The annular groove of the inner member has a bottom portion including a recess for restraining axial displacement of the seal ring relative to the annular groove.

A sealing device includes a seal housing disposed between a cylinder and a rod, an inner seal disposed between the rod and the seal housing, the inner seal being in contact with the rod, and an outer seal disposed between the inner seal and the seal housing, the outer seal being in contact with both the inner seal and the seal housing, in which one of the outer seal and the seal housing has a contact face that is in contact with the other of the outer seal and the seal housing, and the contact face has a concave portion.

A power transmission device is provided, which includes a vibration reducing damper provided on a power transmission path, and a clutch mechanism having a plurality of friction plates, a hydraulic pressure chamber, and a centrifugal balance chamber provided opposed to the hydraulic pressure chamber. The clutch mechanism is provided adjacent to an axial side part of the damper, and an oil drain port for hydraulic fluid supplied to the centrifugal balance chamber of the clutch mechanism is provided at a location radially inward of the damper and axially overlapping with the damper.

A shock absorber includes a seal member that is slidably in contact with a piston rod, a friction member that is formed of an annular elastic rubber section slidably in contact with the piston rod and an annular base section to which the elastic rubber section is fixed, and an communication path that reduces pressure difference between both sides of the friction member in axial direction. The elastic rubber section is provided with a minimum inner diameter section, a first enlarged diameter section, and a second enlarged diameter section. A force is applied to the piston rod by the friction member such that movement in an outward direction of the cylinder becomes difficult and movement in an inward direction of the cylinder becomes easy.