Controlling damping force shock absorber

Details Controlling damping force shock absorber Controlling damping force shock absorber

2006-01-03

2006-01-03

Williams, Thomas (Department: 3683)

Brakes

Internal-resistance motion retarder

Magnetic fluid or material

C188S267100, C267S140140, C267S140150

Reexamination Certificate

active

06981577

ABSTRACT:
In a controllable damping force shock absorber, a piston member connected to a piston rod is disposed in a cylinder in which a magnetic fluid is contained. A disc valve having an extension-stroke pressure-receiving portion and a compression-stroke pressure-receiving portion is provided in the piston member, and a pilot chamber is formed on a rear side of the disc valve. A coil is provided adjacent to passages communicated with the pilot chamber. By energizing the coil, a magnetic field that acts on the magnetic fluid flowing through the passages is generated, changing the viscosity of the magnetic fluid to control a damping force. A valve-opening pressure of the disc valve is controlled according to the pressure in the pilot chamber, such a way that the magnetic fluid exposed to the magnetic field can flow at a low flow rate, thus achieving low power consumption.

REFERENCES:
patent: 6095486 (2000-08-01), Ivers et al.
patent: 6260675 (2001-07-01), Muhlenkamp
patent: 6279702 (2001-08-01), Koh
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patent: 6336535 (2002-01-01), Lisenker
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patent: 6419058 (2002-07-01), Oliver et al.
patent: 6612409 (2003-09-01), Lun et al.
patent: 6637557 (2003-10-01), Oliver et al.
patent: 6655511 (2003-12-01), Lun et al.

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