Motor vehicles – Steering gear – With electric power assist
Patent
1997-09-08
1999-05-18
Mai, Lanna
Motor vehicles
Steering gear
With electric power assist
180443, B62D5/04
Patent
active
059042249
ABSTRACT:
An electric power steering unit includes a rack-shaft(2) to be coupled to the guiding wheels of a vehicle, a housing A for slidably containing the rack-shaft(2)and holding therein a coupling section(6)for causing the teeth of the rack-shaft(2)to engage those of a pinion arranged on the steering column(5)linked to the steering handle of the vehicle and an electric motor(1) coaxially arranged around the rack-shaft(2), which the rotary force is transmitted to the rack-shaft(2)by way of a ball screw mechanism 3 as the steering assisting power. A nut section(19)of the ball-screw mechanism(3)is rotatably supported by a housing(B) separately formed from the housing(A), in a state of supporting the armature shaft(11)of the electric motor(1). The rack-shaft(2) is axially movable and supported by two points of support, one at the coupling section and the other at the nut section supported by the housing(B). Thus, the rack-shaft is not supported by three points such as the conventional power steering unit but supported by two points, the precision requirements for the components are eased and hence the manufacturing cost thereof is reduced.
REFERENCES:
patent: 4766970 (1988-08-01), Shimizu
patent: 4773497 (1988-09-01), Carlson et al.
patent: 5650701 (1997-07-01), Shimizu et al.
patent: 5685390 (1997-11-01), Chikuma et al.
Kodaira Tadao
Onodera Tsugio
Taniguchi Yoshiaki
Cuff Michael
Mai Lanna
Mitsuba Corporation
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