JP2010084831A5 - - Google Patents

Claims (7)

A cylinder filled with fluid, a piston slidably inserted into the cylinder, a piston rod connected to the piston and extending outward from the cylinder, and sliding to at least one of the pistons A pilot type damping valve having a back pressure chamber that controls the flow of the fluid generated by the pressure generator to generate a damping force and introduces a part of the fluid as a pilot pressure to adjust the valve opening;
A shock absorber provided with a pilot pressure control valve for controlling a pilot pressure so that the pressure in the back pressure chamber becomes higher when a low frequency is input than when a high frequency is input at the same piston speed.   The shock absorber according to claim 1, wherein the pilot pressure control valve is disposed upstream of the back pressure chamber.   The pilot pressure control valve has a spring means that normally biases toward the valve closing side, and a damping means that increases the valve opening resistance as the valve opening speed increases with respect to the valve opening. The shock absorber according to claim 1 or 2.   The said pilot pressure control valve controls the pilot pressure introduced into the said back pressure chamber from the inside of the said cylinder pressurized by sliding of the said piston, The Claim 1 characterized by the above-mentioned. Shock absorber. The shock absorber according to claim 4, wherein an introduction orifice is provided upstream of the pilot pressure control valve. A cylinder filled with fluid; a piston slidably inserted into the cylinder; a piston rod connected to the piston and extending to the outside of the cylinder; and sliding to at least one of the pistons A damping valve that generates a damping force by controlling the flow of fluid generated by the valve, a back pressure chamber that is provided on the back side of the damping valve and that causes an internal pressure to act in the valve closing direction of the damping valve, and a sliding of the piston A pilot passage for introducing the flow of fluid into the back pressure chamber, an introduction orifice disposed upstream of the back pressure chamber in the pilot passage, and between the introduction orifice and the back pressure chamber of the pilot passage. A pilot pressure control valve that is energized upstream by a spring means and closes the valve, and the valve opening resistance increases as the valve opening speed increases with respect to the opening of the pilot pressure control valve. There damper, characterized in that it comprises a damping means to increase. The damping means, according to claim 6, characterized in that it has a damping chamber which changes volume by the movement of the valve body of the pilot pressure control valve, and a damping orifice which communicates the inside and outside of the damping chamber Shock absorber.