Damping force control valve and shock absorber using the same

Details Damping force control valve and shock absorber using the same Damping force control valve and shock absorber using the same

2007-02-20

2009-10-20

Torres, Melanie (Department: 3657)

Brakes

Internal-resistance motion retarder

Cylinder structure

C188S315000, C188S322130, C188S322190

Reexamination Certificate

active

07604101

ABSTRACT:
The present invention relates to a damping force control valve and a shock absorber using the same. An object of the present invention is to provide a damping force control valve, in which the damping force characteristic at a high speed is maintained in a low level, and a shock absorber using the same. According to the present invention for achieving the object, there is provided a damping force control valve, which includes a high pressure region in communication with a tension chamber of a cylinder and a low pressure region in communication with a reservoir chamber, and controls a damping force by adjusting pressure of a pilot chamber by orifices, each of which has a channel controlled to open or close by a spool. The valve comprises a main valve installed between the high and low pressure regions and controlled to open or close according to pressure of the high pressure region, an initial preload and pressure of the pilot chamber, the main valve allowing working fluid to flow from the high pressure region to the low pressure region when being opened; a first fixed orifice in communication with the high pressure region; a bypass channel for discharging the working fluid supplied by opening a first variable orifice to the low pressure region, the first variable orifice making the first fixed orifice and the low pressure region communicate with each other; and a second fixed orifice for controlling the working fluid discharged to the low pressure region so that the working fluid supplied by opening a second variable orifice controls a pressure of the pilot chamber, the second variable orifice making the first fixed orifice and the pilot chamber communicate with each other.

REFERENCES:
patent: 5934421 (1999-08-01), Nakadate et al.
patent: 6119829 (2000-09-01), Nakadate
patent: 2005/0167216 (2005-08-01), Park
patent: 0504624 (1992-09-01), None
patent: 09-126263 (1997-05-01), None
patent: 11-094004 (1999-04-01), None
patent: 2001-012534 (2001-01-01), None
patent: 2002-013582 (2002-01-01), None
patent: 2004-263752 (2004-09-01), None
patent: 2006-038097 (2006-02-01), None

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