JPS6433405U - - Google Patents

Description

[Brief Description of the Drawings] Fig. 1 is a diagram showing the principle of the structure of the hydraulic shock absorber according to the present invention, and Fig. 2 is a diagram showing a specific example of a partial structure of the shock absorber main body according to the present invention. cross section,
FIG. 3 is a diagram showing the principle of the structure of a piston portion according to another embodiment, and FIG. 4 is a diagram showing a conventional example in the same way as FIG. 1. Explanation of symbols, 1...Cylinder, 2...Piston part,
2a... Check valve, 2b... Damping valve, 2c... Upper passage, 2d... Lower passage, 2e... Pressure opening/closing valve, 3
... External passage, 4... Base valve section, 4a... Damping valve, 5... Outer tube, 6... Piston rod, 6a... Through hole, 7... Pilot switching valve, 7a...
Stationary position, 7b...Switching position, 8...Operate check valve, 9...Pipe line, 10...Release valve,
A... Upper oil chamber, B... Lower oil chamber, C... Reservoir chamber, P... Pump, S... Shock absorber body, T... Tank.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An upper oil chamber in a cylinder constituting a shock absorber body disposed at each of the four wheels of a vehicle is communicated with a pump via an external passage outside the shock absorber body. , a hydraulic shock absorber configured to allow expansion and contraction of the shock absorber body to adjust the height of the vehicle by supplying and discharging hydraulic oil by the pump; an upper oil chamber in a cylinder forming the shock absorber body; What is the lower oil chamber?
an upper passage whose upper end is defined by a piston part connected to a lower end of a piston rod that protrudes outside the upper end of the cylinder, and which is formed in the piston part or the piston rod and communicates with the upper oil chamber; They communicate with each other through a pilot switching valve connected to the passage, and a lower passage connected to the pilot switching valve and communicating with the lower oil chamber, and one end of which is connected to the external passageway at the axial center of the piston rod. A through hole is formed which is connected to the outer tube and the other end is connected to the pilot switching valve, and a reservoir chamber is formed outside the cylinder and is partitioned between the outer tube and the buffer chamber. The lower passage is connected to the tank via a release valve and a conduit installed outside the main body, and a check valve for preventing the flow of hydraulic oil from the lower oil chamber side and a check valve for controlling the rebound damping force are installed in the lower passage. A damping valve and a pressure opening/closing valve are disposed to allow the pressure to be generated, and the pilot switching valve has a static position that allows communication between the upper passage and the lower passage, and a rest position that allows communication between the through hole and the upper passage. 1. A hydraulic shock absorber, characterized in that the hydraulic shock absorber has a switching position that enables the switching position, and is formed so that the internal pressure in the through hole is used as pilot pressure when switching to the switching position. (2) A utility model in which a base valve part having a damping valve is disposed inside the lower end of the cylinder constituting the shock absorber body, and the reservoir chamber and the lower oil chamber are communicated through the base valve part. A hydraulic shock absorber according to registered claim 1. (3) An operating check valve is disposed in the external passage, and the operating check valve is configured to be opened using the hydraulic pressure used when the pump returns hydraulic oil into the tank as pilot hydraulic pressure. A hydraulic shock absorber according to claim 1 of the patent registration claim.