Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

1995-12-22

1998-06-09

Johnson, Brian L.

Motor vehicles

Steering gear

With electric power assist

475339, 74665B, B62D 504

Patent

active

057621624

ABSTRACT:
A shaft assist electric power steering apparatus including an electric motor and a speed reducer having an input planetary gear set and an output planetary gear set each concentric with a steering shaft. The input planetary gear set includes an input ring gear, an input sun gear, a stationary input planet carrier, and a plurality of input planet pinions one of which is driven by the electric motor. The output planetary gear set includes an output sun gear rigidly connected to the input sun gear, an output ring gear rigidly connected to the input ring gear, an output planet carrier rigidly connected to the steering shaft, and a plurality of output planet pinions. The driven input planet pinion rotates the input sun gear and the input ring gear in opposite directions and, likewise, the output sun gear and the output ring gear. When the pitch diameter of one of the output sun gear and the output ring gear is different from the pitch diameter of the input sun gear and the input ring gear, respectively, the output planet carrier rotates to compensate for the speed difference between input planet pinions and the output planet pinions.

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