Lift axle suspension
First Claim
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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Accused Products
Abstract
A lift axle suspension for a tandem trailer has first and second suspension air bags for first and second axles. There is 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 supplies compressed air to the first suspension air bag and a diverter valve and is controlled by a height selector valve that is opened and closed based on the ride height of the trailer. The diverter valve selectively supplies compressed air to the second suspension air bag and a pressure regulator that limits air pressure to a predetermined pressure. A second pneumatic supplies compressed air to the lift air bag and is controlled by a pilot valve.
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Citations
4 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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Specification