Motor vehicles – Steering gear – With electric power assist
Reexamination Certificate
2006-02-28
2006-02-28
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With electric power assist
C180S444000, C180S422000
Reexamination Certificate
active
07004281
ABSTRACT:
A transmission ratio of a rotational angle of an output shaft to a rotational angle of an input shaft is adjustable by a transmission ratio changing mechanism when a coupling member is in a unlocked position. A resilient member urges the coupling member toward the locked position. A solenoid holds the coupling member at the unlocked position against a resilient force of the resilient member. A solenoid drive control apparatus applies a drive voltage to the solenoid to hold the coupling member positioned at the unlocked position and reduces the drive voltage through a voltage attenuation process before the coupling member finally reaches the locked position. During the voltage attenuation process, the solenoid produces an electromagnetic force yielding to the resilient force of the resilient member and decreases a shifting speed of the coupling member on the way to the locked position.
REFERENCES:
patent: 6164150 (2000-12-01), Shindo et al.
patent: 6718242 (2004-04-01), Mori et al.
patent: 6840347 (2005-01-01), Nakatsu et al.
patent: 6868933 (2005-03-01), Kameya
patent: 11-34894 (1999-02-01), None
Denso Corporation
Luby Matthew
Morris Lesley D.
Posz Law Group , PLC
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