Provided is a rotary damper having a first valve provided in a first oil passage, the rotary damper including an oil chamber filled with oil; a vane located in the oil chamber; a groove which is formed in the vane and functions as a valve box of the first valve; a valve body of the first valve which moves while being in contact with a bottom surface of the groove; and an elastic body which applies elasticity to the valve body, and causes the valve body to come into contact with a wall surface of the oil chamber when the oil does not flow, in which the bottom surface of the groove is a slope, and thereby the valve body which is in contact with the wall surface when receiving oil pressure from one direction moves away from the wall surface when receiving the oil pressure from an opposite 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 vibration damping device which is able to damp vibration of a rotating body in a high-speed range and to certainly accelerate the rotating body to the high-speed range is provided. A vibration damping device 1 damping vibration of a rotating body 100 includes an automatic balancer 2 which is configured to cancel out imbalance of the rotating body 100 when the rotating body rotates 100; a liquid damper 4 which is coaxially rotatable with the rotating body 100 and includes a collision member 23 provided in a casing 20 in which liquid 22 is sealed, the liquid colliding with the collision member 23 when the liquid 22 moves in a circumferential direction; and a relative rotation unit 5 which is configured to cause the liquid damper 4 to rotate relative to the rotating body 100.

A hydraulic damping device includes a housing defining a fluid inlet and a fluid outlet, a damping plate disposed within the housing, the damping plate including a plurality of damping holes defined therethrough and positioned to allow fluid communication between the fluid inlet and the fluid outlet, and a blocking member disposed within the housing and configured to rotate relative to the damping plate to progressively block the damping holes.

A fluid damper device may include a tube-shaped case including a bottom wall, a tube part extended from the bottom wall, and a partitioning protruded part protruded to an inner side from an inner peripheral face of the tube part, and a turning shaft including a body part facing a first end face of the partitioning protruded part, and a flange part which is enlarged from the body part and faces a second end face of the partitioning protruded part, a valve body supported by the body part, and fluid filled within the case. The first end face of the partitioning protruded part is provided with a first rib protruded toward the body part and extended in the axial line direction and a second rib protruded toward the body part and extended in the axial line direction at a position separated in a circumferential direction from the first rib.

A lubrication structure for a shock absorber of vehicle has a protecting pipe and a self-lubricating layer. The protecting pipe is a non-circular metal tube and has an elongated slit. The self-lubricating layer is an engineering plastic layer, is deposited in the protecting pipe and has a shaft hole. When the lubrication structure is deposited between an outer tube and an inner tube of a shock absorber of vehicle, the protecting pipe engages in the outer tube to prevent the self-lubricating layer from contacting the outer tube directly. The self-lubricating layer with small friction coefficient is mounted around the inner shaft to enable the inner shaft to move smoothly relative to the outer tube. The lubrication structure has characteristics of low cost, small volume, and small tolerance, and the life and the practicality of the lubrication structure can be improved.

Provided is a rotary damper that can be easily changed in specifications and can be improved in economic efficiency by an existing rotary damper that can be continued to be used. A rotary damper 100 includes a main housing 101. The main housing 101 includes a module mounting portions 108 for detachably mounting the other functional module 200 to 500. The functional modules 200 to 500 respectively have module rotors 206, 306, 406 and 506 which are rotationally driven by receiving a rotational driving force from the outside, and module output portions 206b, 307a, 407a and 507a formed to be connectable to a main rotor 110, in module housings 201, 301, 401 and 501. Further, the functional modules 200 to 500 include input adjustment mechanisms 205, 305, 405 and 505 having a function of changing at least one of characteristics of the rotational driving force and modes of transmission of the rotational driving force, between the module rotors and the module output portions.

An adjustable damping valve device for a vibration damper, includes a main stage valve which is controlled by a pre-stage valve which is functionally connected in series with the emergency operation valve. A pressure relief valve having the constructional form of a seat valve is arranged inside the emergency operation valve and is functionally connected in parallel with the emergency operation valve. A valve body of the pressure relief valve is formed by at least one annular valve disk.

A method and apparatus for a vehicle shock absorber comprising a main damper cylinder, a first reservoir and a second reservoir. One embodiment includes a first operational mode where both reservoirs are in fluid communication with the cylinder. In a second operational mode, only one reservoir communicates with the cylinder during fluid evacuation from the cylinder. In each mode, rebound from either or both reservoirs may travel through a single, user-adjustable metering device.

[Problem] To provide a rotary damper wherein damping torque generated by rotation can be easily adjusted using a simple configuration. [Solution] A rotary damper 1 limits the movement of viscous fluid contained in a circular cylinder chamber 111, thereby generating damping torque against applied rotational force. This rotary damper 1 is configured such that: a lid 15 is screwed into a case 11; and the gap g1 between the lower surface 153 of the lid 15 and the upper surface 119 of a partition section 115 and the gap g2 between the lower surface 153 of the lid 15 and the upper surface 129 of a vane 122 can be adjusted by adjusting the amount of screwing of the lid 15 into the case 11. This means that adjusting the amount of movement of viscous fluid through the gaps g1, g2 can adjust damping torque generated by rotation.