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Lift axle suspension

  • US 9,776,677 B2
  • Filed: 02/10/2016
  • Issued: 10/03/2017
  • Est. Priority Date: 02/10/2016
  • Status: Active Grant
First Claim
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1. A lift axle suspension for a tandem trailer, the tandem trailer comprising at least a first axle and a second axle, the lift axle suspension comprising:

  • a first suspension air bag mounted to act as suspension for the first axle;

    a second suspension air bag mounted to act as suspension for the second axle;

    a lift air bag that, when pressurized, applies a lifting force to lift the second axle relative to the first axle;

    a first pneumatic circuit that connects the supply of compressed air to each of the first suspension air bag and a diverter valve, the flow of compressed air through the first pneumatic circuit being controlled by a height selector valve that is opened and closed based on the ride height of the trailer, the diverter valve having a first position that supplies compressed air to the second suspension air bag and a second position that supplies compressed air to a pressure regulator that limits air pressure to a predetermined pressure; and

    a second pneumatic circuit that connects a supply of compressed air to the lift air bag, the flow of compressed air through the first pneumatic circuit being controlled by a pilot valve that is opened when the diverter valve is in the second position.

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