Abstract: A multi-cylinder hydraulic shock absorber (D) expands and contracts in accordance with expansion and contraction of a working chamber (R1, R2) provided in a cylinder (1) and having a working fluid sealed therein. An outer periphery of the cylinder (1) is covered by an outer tube (4), and a gas chamber housing (10) projects upward from an upper end of the outer tube (4). A space between the outer tube (4) and the cylinder (1) and an inner side of the gas chamber housing (10) are used as a working fluid reservoir (5). A gas chamber (6) opposing a liquid level (S) of the working fluid is formed inside the gas chamber housing (10). With this constitution, a volume of the gas chamber (6) is secured when the multi-cylinder hydraulic shock absorber (D) is disposed horizontally while suppressing an increase in a diameter of the outer tube (4).

Abstract: A vehicle height adjusting device includes a cylinder (1), a rod (3) inserted in the cylinder (1), a piston (4) connected to the rod (3) and movable within the cylinder (1), and defining a rod side chamber (2a) and an non-rod side chamber (2b) in the cylinder (1), damping parts (4a, 4b) for generating a damping force by the movement of the rod (3), a high pressure chamber (18) and a low pressure chamber (16) charged with gas, a pump chamber (25) for adjusting the vehicle height by supplying the working fluid in the low pressure chamber (16) into the non-rod side chamber (2b), a communicating path (5a) for communicating the non-rod side chamber (2b) and the high pressure chamber (18), and a valve body (20) for increasing and reducing a channel area of the communicating path (5a) depending on the fluid pressure of the high pressure chamber (18).

Abstract: A vehicle height adjusting device includes a cylinder (1), a rod (3) inserted in the cylinder (1), a piston (4) connected to the rod (3) and movable within the cylinder (1), and defining a rod side chamber (2a) and an non-rod side chamber (2b) in the cylinder (1), damping parts (4a, 4b) for generating a damping force by the movement of the rod (3), a high pressure chamber (18) and a low pressure chamber (16) charged with gas, a pump chamber (25) for adjusting the vehicle height by supplying the working fluid in the low pressure chamber (16) into the non-rod side chamber (2b), a communicating path (5a) for communicating the non-rod side chamber (2b) and the high pressure chamber (18), and a valve body (20) for increasing and reducing a channel area of the communicating path (5a) depending on the fluid pressure of the high pressure chamber (18).