Machine element or mechanism – Gearing – Follow-up mechanism
Patent
1998-04-20
1999-11-23
Graysay, Tamara L.
Machine element or mechanism
Gearing
Follow-up mechanism
74422, 74109, 180 644, B62D 504
Patent
active
059880058
ABSTRACT:
An electric power steering unit comprises 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: 4572314 (1986-02-01), Anguera
patent: 4653602 (1987-03-01), Anders et al.
patent: 5623409 (1997-04-01), Miller
patent: 5650701 (1997-07-01), Shimizu et al.
patent: 5711396 (1998-01-01), Joerg et al.
Kodaira Tadao
Onodera Tsugio
Taniguchi Yoshiaki
Fenstermacher David
Graysay Tamara L.
Mitsuba Corporation
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