Shock absorber with auxiliary port in guide member to control hy

Details Shock absorber with auxiliary port in guide member to control hy Shock absorber with auxiliary port in guide member to control hy

1994-03-09

1995-04-04

Ballato, Josie A.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

188319, 13762532, F16F 934

Patent

active

054028671

ABSTRACT:
A cylinder (7) having a hydraulic fluid sealed therein is fitted with a piston (8) having a piston rod (9) connected thereto. The piston rod (9) is provided with a bypass passage (B) (generating relatively small damping force). The passage area of the bypass passage (B) is controlled by varying the area of orifices formed by guide ports (21 and 22) and shutter ports (24 and 25) by rotating a shutter (23), thereby changing damping force characteristics. Auxiliary ports (34 and 35) are provided to open into the guide ports (21 and 22), respectively. The hydraulic fluid jetted out into the shutter (23) from the orifices formed by the guide ports (21 and 22) and the shutter ports (24 and 25) is directed to flow approximately perpendicularly to the direction of sliding of the shutter (23) by the hydraulic fluid jetted out from the auxiliary ports (34 and 35), thereby reducing the hydrodynamic force acting in the sliding direction of the shutter (23), and thus minimizing the force required to actuate and hold the shutter (23).

REFERENCES:
patent: 2182459 (1939-12-01), Vickers
patent: 2461529 (1949-02-01), Curtis et al.
patent: 4620619 (1986-11-01), Emura et al.
patent: 4821851 (1989-04-01), Kruckemeier et al.
patent: 5242038 (1993-09-01), Yamaoka
patent: 5310027 (1994-05-01), Nakamura et al.

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