Electric steering system

Details Electric steering system Electric steering system

1997-06-03

1999-07-13

Oberleitner, Robert J.

Motor vehicles

Steering gear

With electric power assist

180443, B62D 504

Patent

active

059213442

ABSTRACT:
A steering assembly (10) includes a housing (28, 60) and a member (14) which is movable axially in the housing to effect turning movement of steerable wheels of a vehicle. The member (14) has a rack portion (36) for engagement with a pinion (30) and an externally threaded screw portion (40). A ball nut (110) extends around the screw portion (40) of the member (14) and has an internal thread (116). A plurality of balls (200) are disposed between the internal thread (116) on the ball nut (110) and the external thread (40) on the member (14) for transmitting force between the ball nut and the screw portion of the member. An electric motor (50) for rotating the ball nut (110) includes a stator (70) and a rotor (80). A bearing assembly (150) supports the ball nut (110) for rotation relative to the housing, the bearing assembly including a plurality of bearings (152) disposed between first and second races (154, 156). The central radial plane (158) of the bearings (152) intersects the internal thread (116) of the ball nut (110). A first portion of the internal thread (116) on the ball nut (110) is disposed radially inward of the rotor (80) and the stator (70), and a second portion of the internal thread on the ball nut is disposed axially outward of the rotor and the stator.

REFERENCES:
patent: 4415054 (1983-11-01), Drutchas
patent: 4666014 (1987-05-01), Carlson et al.
patent: 4800974 (1989-01-01), Wand et al.
patent: 5295407 (1994-03-01), Hirose et al.
patent: 5437349 (1995-08-01), Kurahashi et al.
patent: 5590732 (1997-01-01), Sugino et al.
patent: 5685390 (1997-11-01), Chikuma et al.
patent: 5704250 (1998-01-01), Black

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