Damping force control type hydraulic shock absorber

Details Damping force control type hydraulic shock absorber Damping force control type hydraulic shock absorber

1996-12-11

1999-08-10

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

188318, 18832213, F16F 946

Patent

active

059344210

ABSTRACT:
In a damping force control type hydraulic shock absorber, the flow path area of a port is changed by moving a spool according to an electric current supplied to an actuator, and thus the flow path area of a passage between cylinder upper and lower chambers is directly changed, thereby controlling orifice characteristics. Moreover, the pressure in a pilot chamber is changed according to the resulting pressure loss so as to change the valve opening pressure of a disk valve, thereby controlling valve characteristics. This enables the damping force characteristic control range to be widened. The pilot chamber is formed by the side wall of a valve member, the disk valve, a seal disk, and a seal member, also, the seal member has no sliding portion. It is therefore possible to minimize the leakage of hydraulic fluid and to obtain stable damping force characteristics. It is also possible to minimize variations in damping force with temperature changes.

REFERENCES:
patent: 4484669 (1984-11-01), Kato
patent: 4819773 (1989-04-01), Ito et al.
patent: 5328004 (1994-07-01), Fannin et al.
patent: 5649611 (1997-07-01), Nakadate
patent: 5655633 (1997-08-01), Nakadate et al.

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