Abstract: An intermediate cylinder is disposed between an outer cylinder and an inner cylinder. The intermediate cylinder forms a passage between the inner cylinder and itself, through which a hydraulic fluid as an electrorheological fluid flows. The intermediate cylinder is supplied (applied) with a voltage through an electrode connector. The intermediate cylinder includes a ring member. The ring member is provided with an extending portion which extends toward the outer cylinder. The extending portion of the ring member is inserted with an electrode pin as an imparting unit for imparting a voltage to the intermediate cylinder.

Abstract: An intermediate cylinder is disposed between an outer cylinder and an inner cylinder. The intermediate cylinder forms a passage between the inner cylinder and itself, through which a hydraulic fluid as an electrorheological fluid flows. The intermediate cylinder is supplied (applied) with a voltage through an electrode connector. The intermediate cylinder includes a ring member. The ring member is provided with an extending portion which extends toward the outer cylinder. The extending portion of the ring member is inserted with an electrode pin as an imparting unit for imparting a voltage to the intermediate cylinder.

Abstract: A shock absorber includes a reservoir between a cylinder and an outer tube, in which hydraulic liquid and gas are sealed; a middle tube between the cylinder and the outer tube; a connecting pipe in the lateral wall of the middle tube, which includes a tip end extending toward the outside of the outer tube; an opening in the outer tube, allowing hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and a partition member in the reservoir, which includes a partition wall that configured to regulate hydraulic liquid's upward flow from the opening in the reservoir. The partition member is made of flexible resin or rubber, provided with a fitting hole, and fitted to the connecting pipe with interference with the connecting pipe inserted through the hole.

Abstract: A shock absorber including a piston inserted into a cylinder (2) having a hydraulic oil sealed therein. An outer tube (3) is provided around the outer periphery of the cylinder to form a reservoir (4) therebetween. A bottomed circular cylindrical casing (25) is joined to a side surface portion of the outer tube, and a damping force control valve (27) is housed in the casing. The bottomed circular cylindrical casing has a bottom (25A) formed with a joint surface (25B) curved along the outer peripheral surface of the outer tube and a flat inner surface (25C). The casing is integrally formed by forging.

Abstract: A shock absorber includes a reservoir between a cylinder and an outer tube, in which hydraulic liquid and gas are sealed; a middle tube between the cylinder and the outer tube; a connecting pipe in the lateral wall of the middle tube, which includes a tip end extending toward the outside of the outer tube; an opening in the outer tube, allowing hydraulic liquid to flow from the outside of the outer tube into the reservoir through the outer side of the connecting pipe; and a partition member in the reservoir, which includes a partition wall that configured to regulate hydraulic liquid's upward flow from the opening in the reservoir. The partition member is made of flexible resin or rubber, provided with a fitting hole, and fitted to the connecting pipe with interference with the connecting pipe inserted through the hole.

Abstract: A shock absorber including a piston inserted into a cylinder (2) having a hydraulic oil sealed therein. An outer tube (3) is provided around the outer periphery of the cylinder to form a reservoir (4) therebetween. A bottomed circular cylindrical casing (25) is joined to a side surface portion of the outer tube, and a damping force control valve (27) is housed in the casing. The bottomed circular cylindrical casing has a bottom (25A) formed with a joint surface (25B) curved along the outer peripheral surface of the outer tube and a flat inner surface (25C). The casing is integrally formed by forging.

Abstract: A damping force adjustable hydraulic shock absorber, in which response delay of a pressure control valve and self-excited vibration of a valve body can be prevented. A damping force is generated by controlling an oil flow between an annular oil passage (21) and a reservoir (4) generated by sliding movement of a piston in a cylinder with use of a back-pressure type main valve (27) and a pressure control valve (28). The damping force is directly generated by the pressure control valve, and valve-opening pressure of the main valve is adjusted by adjusting an inner pressure of a back-pressure chamber. In the pressure control valve, a valve spring is disposed between a valve body and a plunger. A mass of the valve body is sufficiently less than that of the plunger, and a spring stiffness of the valve spring is higher than that of a plunger spring.

Abstract: A shock absorber comprising: a cylinder; a piston partitioning the cylinder into two chambers; a piston rod; a by-pass passage passing through the chambers; and a damping-force adjusting mechanism adjusting a passage area of the by-pass passage, wherein the adjusting mechanism includes: a shutter guide; a shutter movably guided by the shutter guide; and an elastic member elastically retaining the shutter at an initial position, an adjustable passage adjusting the passage area of the by-pass passage as that opening is varied by shift of the shutter is formed, shift of the shutter is not influenced by pressure difference between the chambers, and when the shutter is at the initial position, the adjustable passage is opened with a predetermined degree, and the shutter moves to close the adjustable passage by fluid force that generates by flow of the working fluid of the adjustable passage against elastic force of the elastic member.

Abstract: An object of the present invention is to provide a damping force adjustable hydraulic shock absorber, in which response delay of a pressure control valve and self-excited vibration of a valve body can be prevented. A damping force is generated by controlling an oil flow between an annular oil passage 21 and a reservoir 4 generated by a sliding movement of a piston in a cylinder with use of a back-pressure type main valve 27 and a pressure control valve 28. The damping force is directly generated by the pressure control valve 28, and a valve-opening pressure of the main valve 27 is adjusted by adjusting an inner pressure of a back-pressure chamber 53. In the pressure control valve 28, a valve spring 57 is disposed between a valve body 56 and a plunger 34. A mass of the valve body 56 is sufficiently less than that of a plunger 34, and a spring stiffness of the valve spring 57 is higher than that of a plunger spring 36.