JPS61108544U - - Google Patents

Description

[Brief explanation of the drawing]

The figures show an embodiment of this invention, in which Figure 1 is a vertical sectional view of the end of the piston rod, Figure 2 is an enlarged view of the main part of Figure 1, Figure 3 is an explanatory diagram of the operation, and Figure 4. 1 is a partial longitudinal sectional view including the end of the piston rod; FIG. DESCRIPTION OF SYMBOLS 1... Piston, 2... Rod end, 4... Hydraulic fluid passage, 4a... Hydraulic fluid passage extension part, 5... Guide shaft, 5
a, 11a... Annular groove, 6... Solenoid, 11... Spool valve, 13... Coil spring, 1
5a...through hole, 15b, 16b...orifice hole,
15c...Side wall through hole.

Claims (1)

[Scope of utility model registration request] A cylinder filled with hydraulic fluid and a piston
A piston that is externally fixed to the end of the rod and slidably inserted into the cylinder, and a hydraulic fluid passage that passes through the axis of the end of the piston rod and communicates both compartments in the cylinder. , a damping force adjustable shock absorber comprising an on-off valve for controlling the area of the hydraulic fluid passage, and an actuator for driving the on-off valve, the damping force adjustable shock absorber having a hollow portion at the end of the piston rod in contact with the piston. A guide shaft is provided along the axis of the hollow portion, and the hydraulic fluid passage includes an extension portion bored at one end at the axis of the guide shaft, and an extension portion extending from the end of the extension portion to the guide shaft. The on-off valve has a through hole provided in the radial direction and a side wall through hole provided in the side wall of the piston rod coaxially with the through hole across the hollow portion, and the on-off valve covers the through hole and the side wall through hole is coaxial with the through hole. The spool valve comprises a spool valve that is slidably fitted onto a guide shaft and has a plurality of orifice holes having different diameters that communicate or block the through hole and the side wall through hole by sliding. has a permanent magnet on one end face, and the actuator is a solenoid attached to the outer periphery of the guide shaft with one magnetic pole facing the permanent magnet of the spool valve, and A damping force adjustable shock characterized in that the sliding part is provided with annular grooves having the same width that face each other when the spool valve is at the center of its stroke, and a balance spring is inserted into the annular groove.・Absorber.