Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1998-06-19

2000-03-28

Schwartz, Christopher P.

Motor vehicles

Steering gear

With electric power assist

B62D 504

Patent

active

060418850

ABSTRACT:
An electric power steering apparatus having a rack shaft supported at opposite end portions thereof by a rack-and-pinion mechanism and a ball-screw mechanism, respectively, includes a plain bearing slidably fitted around a rack shaft to support an intermediate portion of the rack shaft. The plain bearing thus provided considerably reduces a support span of the rack shaft and, hence, shifts a resonance frequency of the rack shaft to a higher frequency range. The rack shaft is, therefore, unlikely to cause vibration when external forces or moments caused due, for example, to a reaction from road surface during a steering operation act on opposite ends of the rack shaft.

REFERENCES:
patent: Re32222 (1986-08-01), Drutchas
patent: 4715461 (1987-12-01), Shimizu
patent: 4727950 (1988-03-01), Shimizu et al.
patent: 4766970 (1988-08-01), Shimizu
patent: 4771843 (1988-09-01), Shimizu
patent: 4773497 (1988-09-01), Carlson et al.
patent: 4834202 (1989-05-01), Shimizu
patent: 5299649 (1994-04-01), Sano et al.
patent: 5927429 (1999-07-01), Sugino

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