Four-wheel steering system in wheeled vehicle

Details Four-wheel steering system in wheeled vehicle Four-wheel steering system in wheeled vehicle

1990-06-29

1991-06-04

Marmor, Charles A.

Land vehicles

Wheeled

Running gear

74499, B62D 308, B62D 715

Patent

active

050208128

ABSTRACT:
In a four-wheel steering system for a wheeled vehicle, a rear-wheel steering mechanism includes an input shaft drivingly connected at its front end to a front-steering wheel mechanism through a mechanical linkage, a lateral relay rod arranged perpendicularly to the input shaft and being drivingly connected to the input shaft to be rotated in accordance with a rotation angle of the input shaft, the relay rod having an intermediate portion formed thereon with a screw groove containing therein a plurality of balls and being operatively connected at the opposite ends thereof to a pair of dirigible rear road wheels, a ball nut assembled with a rear end of the input shaft and having an axial bore formed with a screw groove containing therein the balls, the ball nut being coupled over the intermediate portion of the relay rod through the balls to effect axial displacement of the relay rod in accordance with rotary motion of the same. The ball nut is arranged to be axially displaced in the opposite direction relative to the displacement direction of the relay rod when the input shaft is rotated at a small angle.

REFERENCES:
patent: 4779880 (1988-10-01), Hyodo
patent: 4949984 (1990-08-01), Vemura et al.

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