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Four-wheel steering arrangement for motor vehicles

  • US 5,088,573 A
  • Filed: 05/09/1991
  • Issued: 02/18/1992
  • Est. Priority Date: 03/05/1988
  • Status: Expired due to Fees
First Claim
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1. A steering system for a motor vehicle having:

  • a first steering device for front wheels of the motor vehicle operatively arranged to be actuated by a steering wheel; and

    a second steering device for rear wheels of the motor vehicle held by wheel suspension links, comprising (a) an integral semi-trailing arm device for each of the rear wheels linked to a body side of the motor vehicle by bearings to define a swivel axis of the semi-trailing arm device and configured to have two bearing arms rigidly secured with respect to each other and operatively arranged to hold wheel carriers of the rear wheels so that the rear wheels are pivotable about a vertical axis of rotation, (b) support joints arranged in planes one above the other and above and below a wheel axis of the rear wheels and operatively associated with the bearing arms for permitting pivoting of the rear wheels about the vertical axis, (c) a hydraulic control cylinder, (d) a restoring device operatively connected with the hydraulic control cylinder along a common axis, (e) bearing levers integral with the wheel carriers, (f) tie rods operatively connected between, on one hand, a respective one of the hydraulic control cylinder and the restoring device, and, on the other hand, to the bearing levers via a deflecting joint arranged in a swivel axis of the semi-trailing arm device, wherein the tie rods share the common axis of the hydraulic control cylinder and the restoring device, (g) a cross tube secured at the body of the motor vehicle for supporting the semi-trailing arm device via the bearings defining the swivel axis, and (h) an electronic control unit operatively connected with the hydraulic control cylinder for steering of the rear wheels in response to driving conditions fed to the electronic control unit independently of the front wheels.

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