Abstract: A piston assembly of a shock absorber is provided. A compression retainer and a rebound retainer are disposed above and under a piston body. A blow-off reducing unit is disposed between the compression retainer and an auxiliary valve and on a bottom surface of the auxiliary valve to form a plurality of blow-off points, so that a rapid variation in a damping force can be considerably reduced even in a low-speed and middle-speed transition period.

Abstract: Disclosed herein is a valve structure of a shock absorber which forms flow channels in two directions of working fluid passing through the valve structure so as to slow change of damping force when the moving velocity of a piston is changed between a low velocity and a middle and high velocity and forms one of the two flow channels as a variable flow channel to improve ride comfort of a vehicle. The valve structure includes a piston valve assembly installed at the end of the piston rod and operated to generate damping force varied according to moving velocity of a working fluid, and a variable valve assembly moving together with the piston valve assembly to vary damping force to slow change of a damping force curve when the flow velocity of the working fluid is changed between a low velocity and a middle and high velocity.

Abstract: A piston assembly of a shock absorber is provided. A compression retainer and a rebound retainer are disposed above and under a piston body. A blow-off reducing unit is disposed between the compression retainer and an auxiliary valve and on a bottom surface of the auxiliary valve to form a plurality of blow-off points, so that a rapid variation in a damping force can be considerably reduced even in a low-speed and middle-speed transition period.

Abstract: Disclosed herein is a valve structure of a shock absorber which respectively controls damping force at a low amplitude and a high amplitude when a piston valve is compressed and expanded and thus simultaneously satisfies ride comfort and stability of a vehicle. The valve structure of the shock absorber which has a cylinder filled with a working fluid and a piston rod provided with one end located within the cylinder and the other end extending to the outside of the cylinder, includes a main piston valve assembly installed at the end of the piston rod and operated to generate damping force varied according to moving velocity under the condition that the inside of the cylinder is divided into an upper chamber and a lower chamber, and a sub piston valve assembly moving together with the main piston valve assembly to generate damping force varied according to frequency.

Abstract: Disclosed herein is a valve structure of a shock absorber which forms flow channels in two directions of working fluid passing through the valve structure so as to slow change of damping force when the moving velocity of a piston is changed between a low velocity and a middle and high velocity and forms one of the two flow channels as a variable flow channel to improve ride comfort of a vehicle. The valve structure includes a piston valve assembly installed at the end of the piston rod and operated to generate damping force varied according to moving velocity of a working fluid, and a variable valve assembly moving together with the piston valve assembly to vary damping force to slow change of a damping force curve when the flow velocity of the working fluid is changed between a low velocity and a middle and high velocity.

Abstract: Disclosed is a double sliding piston valve in which a sliding valve is added to a piston valve to realize gentle variation of damping force. The double sliding piston valve for use in a shock absorber, includes a housing placed in a lower region of a piston to store oil therein, a sliding valve received in the housing, the sliding valve having first and second flow-paths formed therein, pressure springs respectively coming into close contact with upper and lower surfaces of the sliding valve to enable vertical sliding of the sliding valve, and a washer provided below the sliding valve to support the sliding valve, the washer having a center oil hole.

Abstract: A shock absorber includes: a working tube having a first internal diameter portion and a second internal diameter portion, an internal diameter of which is smaller than an internal diameter of the first internal diameter portion; a piston valve having an external diameter corresponding to the internal diameter of the first internal diameter portion and sliding along the inner surface of the first internal diameter portion; and a damping piston having an external diameter corresponding to the internal diameter of the second internal diameter portion and sliding along the inner surface of the second internal diameter portion. The second internal diameter portion is disposed at a lower portion of the working tube, such that it interacts with the damping piston when a full bump of the shock absorber occurs. The second internal diameter portion includes a slit that is formed in a longitudinal direction and faces the damping piston.