| 主权项 |
1. A damping force variable valve assembly, which is installed in a damping force variable shock absorber for adjustment of a damping force of the shock absorber, the damping force variable valve assembly comprising:
a solenoid which generates a magnetic force when an electric current is applied thereto; a spool which is movable by the magnetic force of the solenoid; a spool guide which surrounds the spool to guide a movement of the spool; a valve body which is installed in the spool guide; a main valve which is installed in a main passage formed in the valve body, and generates a damping force; a back pressure chamber which is provided to have a back pressure to pressurize the main valve from the rear of the main valve; a chamber forming body which is installed outside the valve body to form the back pressure chamber; and a low-speed control valve which is installed in a low-speed passage formed in the valve body, and generates a damping force, wherein the damping force of the shock absorber is variable between a hard mode in which the back pressure of the back pressure chamber is increased and a soft mode in which the back pressure of the back pressure chamber is decreased, when an inner passage within the damping force variable valve assembly is changed by interaction of the spool and the spool guide, and the low-speed control valve generates the damping force when a flow rate of a working fluid is low in the soft mode. |
