Vehicle suspension damper with relative velocity sensor having c

Details Vehicle suspension damper with relative velocity sensor having c Vehicle suspension damper with relative velocity sensor having c

1991-12-20

1993-10-12

Butler, Douglas C.

Brakes

Internal-resistance motion retarder

Controlled by an operator remote from retarder

18832212, 280707, B60G 1126

Patent

active

052517292

ABSTRACT:
A relative velocity sensor in a vehicle suspension damper comprises an annular, radially polarized magnet at the top of the shock cylinder adjacent a sensor winding on the inside of the dust tube. A closed magnetic circuit is defined from the magnet through an annular magnetic member inside the magnet to the piston rod and back through the dust tube across the sensor winding to the magnet. Flux below the magnet is similarly confined through the cylinder and does not affect the sensor winding. The air gaps at the winding and the piston rod do not change with axial movement; and the flux linkage variation with axial movement is thus linear across the entire coil. A voltage is generated across the coil which is a strong and accurate signal of relative movement between the sprung and unsprung masses of the vehicle.

REFERENCES:
patent: 4674768 (1987-06-01), Morra
patent: 4866437 (1989-09-01), Morra
patent: 4909536 (1990-03-01), Hale
patent: 4989844 (1991-02-01), Wijnhoven et al.
patent: 5000478 (1991-03-01), Kerastas
patent: 5004264 (1991-04-01), Kozaki et al.
patent: 5009450 (1991-04-01), Herberg et al.
patent: 5120030 (1992-06-01), Lin et al.
patent: 5135251 (1992-08-01), Wormann

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