JPS61179431U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of the hydraulic shock absorber according to the present invention, Fig. 2 is a perspective view of the adjustment valve, and Fig. 3 is a sectional view showing the adjustment valve moved upward when the piston rod is contracted. , FIG. 4 is a characteristic diagram showing the relationship between piston speed and damping force. 10: hydraulic shock absorber, 12: cylinder, 14: piston, 16: piston rod, 26: first passage, 28: second passage, 30: third passage, 36
: Adjustment valve, 44: Fourth passage, 46: Fifth passage.

Claims (1)

[Scope of utility model registration request] a cylinder; a piston slidably disposed within the cylinder and partitioning the interior of the cylinder into first and second fluid chambers; and a piston rod coupled to the piston that communicates with the first fluid chamber and has an axis. A piston rod having a first passage extending in the direction, a second passage extending from the passage toward the outer peripheral surface and communicating with the second liquid chamber, and a third passage constituting a detour of the first passage. a control rod rotatably disposed within the piston rod; and a regulating valve disposed within a first passage axially movably engaged with the control rod and rotated by the control rod. a regulating valve having a fourth passage that communicates with the first and third passages; and a fifth passage that communicates with the first passage and is capable of communicating with the third passage; Fifth
a hydraulic shock absorber, wherein the passageway is isolated from the third passageway upon extension of the piston rod and communicates with the third passageway upon retraction of the piston rod;