Hydraulic shock absorber with shutters

Details Hydraulic shock absorber with shutters Hydraulic shock absorber with shutters

1993-09-17

1995-02-07

Butler, Douglas C.

Brakes

Internal-resistance motion retarder

Resistance alters relative to direction of thrust member

188280, 188317, 18832213, 18832222, 18832215, F16F 944, F16F 950

Patent

active

053868927

ABSTRACT:
In the disclosed hydraulic shock absorber, damping force characteristics are adjusted in accordance with the frequency of stroke, and the damping force is made small at the time when the directions of stroke are changed from one to the other. Cylinder upper and lower chambers are communicated with each other through main hydraulic fluid passage and first and second bypass passages. During the extension stroke, the second bypass passage is cut off by a check valve, and a shutter in the first bypass passage is slid in accordance with the frequency of stroke by the fluid flowing through an orifice passage to regulate the passage area of the first bypass passage. During the contraction stroke, the first bypass passage is cut off by a check valve, and a shutter in the second passage is slid in accordance with the frequency of stroke by the fluid flowing through an orifice passage to regulate the passage area of the second bypass passage. During either of the extension and contraction strokes, the shutter for the other stroke returns to the original position by the action of the hydraulic pressure in the cylinder.

REFERENCES:
patent: 4765446 (1988-08-01), Murata et al.
patent: 5248014 (1993-09-01), Ashiba
patent: 5316116 (1994-05-01), Furuya et al.

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