Abstract: A hydraulic shock absorber includes: a cylinder which demarcates a piston oil chamber and a rod oil chamber; an outer cylinder body which demarcates between the cylinder and the outer cylinder body a reflux path that connects the piston oil chamber and the rod oil chamber with each other and which demarcates between a damper case and the outer cylinder body a reservoir chamber; and a valve structure mounted to the cylinder and the outer cylinder body. The valve structure has a valve for controlling an oil flow between the piston oil chamber and the reflux path and between the piston oil chamber and the reservoir chamber. The valve structure comprises a first valve structure mounted to an open end of the cylinder and a second valve structure mounted to an open end of the outer cylinder body. A cylinder assembly and an outer cylinder assembly are independently arranged.

Abstract: A hydraulic shock absorber includes: a cylinder which demarcates a piston oil chamber and a rod oil chamber; an outer cylinder body which demarcates between the cylinder and the outer cylinder body a reflux path that connects the piston oil chamber and the rod oil chamber with each other and which demarcates between a damper case and the outer cylinder body a reservoir chamber; and a valve structure mounted to the cylinder and the outer cylinder body. The valve structure has a valve for controlling an oil flow between the piston oil chamber and the reflux path and between the piston oil chamber and the reservoir chamber. The valve structure comprises a first valve structure mounted to an open end of the cylinder and a second valve structure mounted to an open end of the outer cylinder body. A cylinder assembly and an outer cylinder assembly are independently arranged.

Abstract: In a damping force adjusting structure of a hydraulic shock absorber, a blow valve blowing an oil liquid in a rod side chamber to a back pressure chamber is provided in a back pressure introduction path introducing the oil liquid in the rod side chamber to the back pressure chamber, and a blow valve has a first pressure receiving portion capable of receiving the pressure of the rod side chamber before and after the valve opening, and a second pressure receiving portion capable of receiving the pressure of the rod side chamber after the valve opening.

Abstract: In a damping force adjusting structure of a hydraulic shock absorber, a blow valve blowing an oil liquid in a pressurized piston side chamber to a rod side chamber is provided in a bypass path communicating the rod side chamber and the piston side chamber while bypassing a damping valve, and the blow valve has a first pressure receiving portion which can receive the pressure of the piston side chamber before and after the valve opening, and a second pressure receiving portion which can receive the pressure of the piston side chamber after the valve opening.

Abstract: In an oil seal of a hydraulic shock absorber, the oil seal is made of a nitrile rubber of a low nitrile, and an inner diameter of a second lip is set to be smaller within a range between 0.3 and 1.0 mm &phgr; than an outer diameter of a piston rod.

Abstract: In an oil seal of a hydraulic shock absorber, the oil seal is made of a nitrile rubber of a low nitrile, and an inner diameter of a second lip is set to be smaller within a range between 0.3 and 1.0 mm &phgr; than an outer diameter of a piston rod.