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Hydraulic system for a vehicle suspension

  • US 7,789,398 B2
  • Filed: 02/27/2004
  • Issued: 09/07/2010
  • Est. Priority Date: 02/27/2003
  • Status: Active Grant
First Claim
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1. A hydraulic system for a vehicle suspension for a vehicle, the vehicle including a vehicle body and at least two forward and two rearward wheel assemblies, the vehicle suspension including front and rear resilient vehicle support means between the vehicle body and the wheel assemblies for resiliently supporting the vehicle above the wheel assemblies, the hydraulic system including:

  • at least two front and two rear wheel rams respectively located between the wheel assemblies and the vehicle body, each ram including at least a compression chamber and a rebound chamber;

    wherein the compression chamber and rebound chamber of each of said front wheel rams is in fluid communication with the rebound chamber and compression chamber respectively of a diagonally opposed rear wheel ram to respectively provide a first and a second fluid circuit, each fluid circuit providing a front and back compression volume therein, the front compression volume of one of said fluid circuits being in fluid communication with the back compression volume of the other of said fluid circuits, and wherein damping means are provided for damping fluid flow within each compression volume and between the front and back compression volumes, such that suspension parameters provided by the hydraulic system can be independently tuned from each other; and

    wherein at least one pitch damper valve is disposed between the first and the second fluid circuits to damp fluid flow between the front and back compression volumes of the respective first and second fluid circuits giving pitch control such that the suspension roll stiffness, roll damping, pitch damping and heave damping provided by the hydraulic system can be independently tuned from each other.

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