STEERING DEVICE

摘要

Left and right front wheels are steered by rotation of steering shafts, and a steering force from a steering wheel is inputted into the steering shaft. Mutually adjacent ends of the shafts are coupled to a ring gear and a sun gear of a planetary gear set, a steering angle adjustment motor is drivably coupled to a carrier of the planetary gear set, and the rotation ratio between the shafts is made changeable. Left and right rear wheels are steered by rotation of steering shafts, and a steering force from a steering motor is inputted into the shaft. Mutually adjacent ends of the shafts are respectively coupled to a ring gear and a sun gear of a planetary gear set, a steering angle adjustment motor is drivably coupled to a carrier of the planetary gear set, and the rotation ratio between the shafts is made changeable.

主权项

1. A steering device for a vehicle in which left and right front wheels and left and right rear wheels are steered by rotation about a longitudinal axis of a steering shaft provided to each of the wheels so as to extend inwards along the vehicle width direction,
the steering device is comprising: a steering force source configured to transmit a steering force when a steering operation is performed individually on one of the steering shafts of the left and right front wheels and to one of the steering shafts of the left and right rear wheels; and a first differential gear set configured to be interposed between an end of the steering shaft of the left front wheel and an end of the right front wheel, the end of the steering shaft of the left front wheel being adjacent the end of the steering shaft of the right front wheel and a second differential gear set configured to be interposed between an end of the steering shaft of the left rear wheel and end of the steering shaft of the right rear wheel, the end of the steering shaft of the left rear wheel being adjacent the end of the steering shaft of the right rear wheel, the first differential gear set including a first rotation element, a second rotation element and a third rotation element, the first and second rotation elements of the first differential gear set being coupled the ends of the left and right front wheel steering shafts, respectively, and the second differential gear set including a first rotation element, a second rotation element and a third rotation element, and the first and second rotation elements of the second differential gear set being coupled to the ends of the left and right rear wheel steering shafts, respectively; a front-wheel steering angle adjustment actuator drivably coupled to the third rotation element of the first differential gear set; and a rear-wheel steering angle adjustment actuator drivably coupled to the third rotation element of the second differential gear set.