Damping force control type hydraulic shock absorber

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

1994-03-07

1995-04-11

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

188299, 18832215, F16F 934

Patent

active

054049733

ABSTRACT:
In a damping force control type hydraulic shock absorber according to the invention, an extension-side bypass passage extends through an extension-side chamber (17b) in a shutter (17). A check valve (28) allows the flow of hydraulic fluid only during the extension stroke. A contraction-side bypass passage extends through a contraction-side chamber (17a) in the same shutter (17). Disk valves (30) allow the flow of hydraulic fluid only during the contraction stroke. By rotating the shutter (17), alignment between an extension-side inlet port (31) and an extension-side inlet opening (34) changes and alignment between a contraction-side inlet port (32) and a contraction-side inlet opening (33) also changes, thereby controlling the passage area of each of the extension- and contraction-side bypass passages, and thus enabling different damping force characteristics to be simultaneously selected for the extension and contraction sides. Since the extension- and contraction-side chambers (17a, 17b) are independent of each other, no turbulent flow will occur in the shutter (17) when the direction of stroke of a piston rod (8) changes, and hence no noise will be generated.

REFERENCES:
patent: 5088760 (1992-02-01), Kakizaki et al.
patent: 5129488 (1992-07-01), Furuya et al.
patent: 5193655 (1993-03-01), Sasaki et al.
patent: 5242038 (1993-09-01), Yamaoka
patent: 5293971 (1994-03-01), Kanari et al.
patent: 5316114 (1994-05-01), Furuya et al.
patent: 5324066 (1994-06-01), Masamura et al.

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