Abstract: A shock absorber includes a housing that includes an annular nut portion threaded to an outer circumference of a front end portion of a piston rod, an annular flange portion protruding outward from the nut portion, and a tubular portion extending from an outer circumference of the flange portion in a direction away from the piston rod, a tube that is inserted into the housing, and an elastic member that is attached to an inner circumference of the tube to define a first chamber communicating with an extension side chamber and a second chamber communicating with a compression side chamber inside the housing and the tube is fixed while being sandwiched between the flange portion and a bent portion corresponding to a support portion formed by caulking a front end of the tubular portion inward.

Abstract: A shock absorber includes: a cylinder; a piston that is movably inserted into the cylinder and defines an extension side chamber and a compression side chamber inside the cylinder; an extension side damping passage and a compression side damping passage that communicate the extension side chamber with the compression side chamber; a pressure chamber that communicates with the extension side chamber and the compression side chamber; and an elastic member that defines a first chamber communicating with the extension side chamber and a second chamber communicating with the compression side chamber inside the pressure chamber.

Abstract: A shock absorber includes; a free piston that partitions the compression chamber into an expansion-side compression chamber and a contraction-side compression chamber; an expansion-side flow passage that connects the expansion-side chamber with the expansion-side compression chamber; a contraction-side flow passage that connects the contraction-side chamber with the contraction-side compression chamber; an expansion-side bypass valve provided in the expansion-side flow passage to admit only a flow directed from the expansion-side chamber to the expansion-side compression chamber and generate resistance; a contraction-side bypass valve provided in parallel with the expansion-side bypass valve to admit only a flow directed from the expansion-side compression chamber to the expansion-side chamber and generate resistance; an expansion-side elastic stopper configured to stop the free piston at an expansion-side stroke end; and a contraction-side elastic stopper configured to stop the free piston at a contraction-s

Abstract: A shock absorber includes; a free piston that partitions the compression chamber into an expansion-side compression chamber and a contraction-side compression chamber; an expansion-side flow passage that connects the expansion-side chamber with the expansion-side compression chamber; a contraction-side flow passage that connects the contraction-side chamber with the contraction-side compression chamber; an expansion-side bypass valve provided in the expansion-side flow passage to admit only a flow directed from the expansion-side chamber to the expansion-side compression chamber and generate resistance; a contraction-side bypass valve provided in parallel with the expansion-side bypass valve to admit only a flow directed from the expansion-side compression chamber to the expansion-side chamber and generate resistance; an expansion-side elastic stopper configured to stop the free piston at an expansion-side stroke end; and a contraction-side elastic stopper configured to stop the free piston at a contraction-s

Abstract: A damping device comprises a piston that partitions an interior of a cylinder into first and second working chambers. A flow-rate-dependent damping force generating element connects the first and second working chambers. A first pressure chamber and a second pressure chamber divided by a free piston are formed integrally with the piston. A first connecting passage connects the first working chamber and the first pressure chamber, and a second connecting passage connects the second working chamber and the second pressure chamber. By providing a relief valve that allows fluid to flow from the first working chamber into the second working chamber, an increase in the generated damping force during a high speed operation of the piston can be suppressed, regardless of a vibration frequency of the piston.

Abstract: A shock absorber includes a cylinder, a piston, a piston rod, an expansion-side passage that allows a fluid to flow only from an expansion-side chamber toward a contraction-side chamber, a contraction-side passage that allows the fluid to flow only from the contraction-side chamber toward the expansion-side chamber, an expansion-side damping valve that applies resistance to a flow of fluid passing through the expansion-side passage, a contraction-side damping valve that applies resistance to a flow of fluid passing through the contraction-side passage, an expansion-side bypass passage that connects the expansion-side chamber to the contraction-side chamber, an expansion-side relief valve that is opened by pressure in the expansion-side chamber so as to open the expansion-side bypass passage, a contraction-side bypass passage that connects the expansion-side chamber to the contraction-side chamber, and a contraction-side relief valve that is opened by pressure in the contraction-side chamber so as to open the

Abstract: A damping device comprises a piston that partitions an interior of a cylinder into first and second working chambers. A flow-rate-dependent damping force generating element connects the first and second working chambers. A first pressure chamber and a second pressure chamber divided by a free piston are formed integrally with the piston. A first connecting passage connects the first working chamber and the first pressure chamber, and a second connecting passage connects the second working chamber and the second pressure chamber. By providing a relief valve that allows fluid to flow from the first working chamber into the second working chamber, an increase in the generated damping force during a high speed operation of the piston can be suppressed, regardless of a vibration frequency of the piston.

Abstract: A pedal device is provided with an accelerator pedal pivotally mounted in a vehicle; and a damper disposed between the accelerator pedal and the vehicle. The depressing force as a depression degree of the accelerator pedal is deter mined by the damper according to the movement of the accelerator pedal. Thus, the pedal device does not use friction members which create abrasion and the function thereof is not impaired even if exchange and maintenance are not carried out over a long period of time. Therefore, maintenance frequency and cost of the pedal device can be reduced.