Steerable drive axle with electrically-powered steering apparatu

Motor vehicles – Steering gear – Each wheel steerable

Patent

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Details

180253, 180375, 180444, 180445, B62D 504

Patent

active

06039143&

ABSTRACT:
A steerable drive axle for a motor vehicle including a rigid tubular housing, a pair of steering knuckles at opposite ends of the rigid tubular housing, an expanded chamber in the middle of the rigid tubular housing open on one side for access to a differential gear set in the expanded chamber, a differential cover for closing the open side of the expanded chamber, and an electrically-powered steering apparatus on the cover linked to the steering knuckles. The electrically-powered steering apparatus includes a rack bar passage in the differential cover, a rack bar supported in the rack bar passage for linear translation and linked to the steering knuckles, a pinion head rotatably supported on the differential cover having a pinion gear meshing with a rack gear on the rack bar, an electric motor mounted on the differential cover, and a speed reducer on the differential cover between the pinion head and an output shaft of the electric motor. In a preferred embodiment, the speed reducer consists of a pair of planetary gear sets affording double reduction torque multiplication between the electric motor and the pinion head.

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