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All-wheel steering system for motor vehicles

  • US 5,086,863 A
  • Filed: 11/02/1990
  • Issued: 02/11/1992
  • Est. Priority Date: 06/15/1988
  • Status: Expired due to Fees
First Claim
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1. An all-wheel steering system for motor vehicles including a steering wheel for activating a first steering system (1) for steering front wheels of the vehicle, a second steering system (11) for steering rear wheels of the vehicle, the second steering system including an adjusting motor (10) activated by a control device (22) as a function of the steering of the front wheels, the adjusting motor including working pistons (25, 25A) mounted on a piston rod (24) for providing steering movement to the vehicle rear wheels, the adjusting motor further including two steering pistons (27, 27A) positioned on the piston rod and defining a pressure chamber (33) therebetween having a variable volume in accordance with the position of the steering pistons, the pressure chamber being connected with the control device, the adjusting motor further including stops (36, 36A) for bracing the steering pistons and a spring mechanism (34, 40) for biasing the steering pistons,the improvement wherein,(a) the adjusting motor includes control chambers (28, 28A) defined by the steering pistons on opposite sides of the pressure chamber, the working pistons being arranged in said control chambers;

  • (b) the working pistons are supported by the steering pistons when the steering pistons abut against the stops; and

    (c) the control device includes(1) a 2/2-way valve (37) having a through flow position for relieving the pressure chamber and a blocking position for retaining pressure in the pressure chamber; and

    (2) a pressure monitor (38) connecting with an electronic switching device for monitoring pressure increases in the pressure chamber.

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