Electric power steering unit

Details Electric power steering unit Electric power steering unit

1997-09-08

1999-02-16

Boehler, Anne Marie

Motor vehicles

Steering gear

With electric power assist

180443, B62D 504

Patent

active

058710655

ABSTRACT:
An electric power steering unit has an armature shaft that is free from axial forces and hence may have less rigorous requirements for its strength so that it may be manufactured more efficiently at reduced cost. It 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 is linked to the armature shaft 11 of the electric motor 1 and rotatably supported by the housing B. The reaction force from the rack-shaft 2 generated by the inertia of the armature shaft 11 is transmitted to the housing B by way of the nut section 19 so that the armature shaft 11 is free from any axial force.

REFERENCES:
patent: 4766970 (1988-08-01), Shimizu
patent: 4773497 (1988-09-01), Carlson et al.
patent: 5685390 (1997-11-01), Chikuma et al.

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