Damping force adjusting type hydraulic shock absorber

Details Damping force adjusting type hydraulic shock absorber Damping force adjusting type hydraulic shock absorber

1997-03-12

1999-12-07

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

1882665, 1882822, F16F 500

Patent

active

05996748&

ABSTRACT:
A piston is slidably fitted in a cylinder for dividing the interior of the cylinder into upper and lower cylinder chambers. A reservoir is connected to the piston. A primary passage communicates between the upper cylinder chamber and the reservoir. The primary passage includes a primary damping valve. A secondary passage is connected to the primary passage to bypass the primary damping valve. A constant orifice, a filter, and a damping force adjusting valve are provided in the secondary passage. The primary damping valve includes a pilot line. The pilot line is connected downstream of the filter. The flow resistance of the damping force adjusting valve is directly adjusted by changing the cross sectional flow area of the damping force adjusting valve. The valve opening pressure of the primary damping valve is adjusted by changing the pilot pressure introduced from the pilot line. When the filter becomes clogged, the primary passage ensures the flow of the hydraulic fluid. The pilot pressure is then lowered so that the valve opening pressure of the primary damping valve is lowered to keep the damping force suitably low.

REFERENCES:
patent: 4958705 (1990-09-01), Horvath
patent: 4986393 (1991-01-01), Preukschat et al.
patent: 5328004 (1994-07-01), Fannin et al.
patent: 5375683 (1994-12-01), Huang et al.
patent: 5586627 (1996-12-01), Nezu et al.
patent: 5655633 (1997-08-01), Nakadate et al.
patent: 5730261 (1998-03-01), Spakowski et al.

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