Vehicle with steering devices for front and rear wheels

Patent metadata

Field	Value
Publication number	US-9834249-B2
Application number	US-201415034665-A
Country	US
Kind code	B2
Filing date	Nov 5, 2014
Priority date	Nov 14, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A vehicle is provided of which the four wheels are steerable, and which is prevented from unexpectedly moving forward or backward when switching the travel mode. The vehicle includes a steering device for front right and front left wheels of the vehicle capable of steering the front right and front left wheels, respectively, in one and the other of the right and left directions, a steering device for rear right and rear left wheels of the vehicle configured, simultaneously when the steering device for the front right and front left wheels are actuated, to be capable of steering the rear right and rear left wheels in the other and the one of the right and left directions, respectively, and in-wheel motors provided in at least one of each of the front right and front left wheels and each of the rear right and rear left wheels.

First claim

What is claimed is:

1. A vehicle comprising:
a first steering device configured to steer front right and front left wheels of the vehicle, respectively, in one and the other of right and left directions which are opposite to each other;
a second steering device configured to steer rear right and rear left wheels of the vehicle in the other and the one of the right and left directions, respectively, simultaneously when the first steering device is actuated; and
in-wheel motors provided in at least one of each of the front right and front left wheels and each of the rear right and rear left wheels;
wherein the in-wheel motors are configured to be activated to assist in the steering of the respective wheels about king pin axes by rotating the wheels under driving forces of the in-wheel motors while the first steering device steers the front right and the front left wheels, respectively, in one and the other of right and left directions opposite to each other and the second steering device simultaneously steers the rear right and rear left wheels in the other and the one of the right and left directions, respectively.

2. The vehicle of claim 1 , wherein each of the first steering device and the second steering device further includes:
tie rods connected, respectively, to the corresponding right and left wheels so as to move and steer the respective right and left wheels;
a pair of rack bars connected to the respective tie rods;
a synchronizing gear meshing with rack teeth of the pair of rack bars and configured such that a movement of a first one of the rack bars in one of the right and left directions is converted to a movement of a second one of the rack bars in the other of the right and left directions; and
a rack bar moving device configured to move the pair of rack bars in one and the other of the right and left directions, respectively,
wherein the rack bar moving device comprises:
a first pinion gear meshing with the first one of the rack bars;
a second pinion gear meshing with the second one of the rack bars; and
a coupling mechanism configured to selectively couple together the first pinion gear and the second pinion gear, and selectively uncouple the first pinion gear and the second pinion gear from each other.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Ishikawa Tomomi
• Inokuchi Kazuyuki

Classifications

• B62D3/12

  of rack-and-pinion type · CPC title

• Y02T10/641

  Cross-Sectional Technologies · mapped topic

• B62D7/1509 Primary

  with different steering modes, e.g. crab-steering, or steering specially adapted for reversing of the vehicle · CPC title

• B62D3/126

  characterised by the rack · CPC title

• B60L1/003

  to auxiliary motors, e.g. for pumps, compressors · CPC title