Steerable and liftable independent suspension system
A liftable independent suspension system which may also be steerable. In a described embodiment, a liftable suspension system for use on a vehicle includes wheel spindles positioned to extend outwardly at each respective lateral side of the vehicle. The spindles are displaceable independent of each other. An actuator is operable to raise at least one of the spindles, so that a tire rotatably connected to the spindle is liftable out of engagement with a road surface when the actuator raises the spindle.
1. A liftable suspension system for use on a vehicle, the suspension system comprising:
first and second wheel spindles which support respective first and second wheels having respective first and second camber angles;
first and second support devices, each of the first and second spindles extending outwardly relative to a respective one of the first and second support devices, and the first and second support devices being spaced apart in a lateral direction;
first and second arms, each of the first and second support devices being pivotably connected to a respective one of the first and second arms, whereby each of the first and second arms is pivotable about a pivot orthogonal to the lateral direction, and each of the first and second arms being configured for pivotable connection to a frame of the vehicle; and
an actuator which lifts at least the first support device relative to the vehicle frame when the suspension system is attached to the frame, the actuator applying a force to the first arm and an oppositely directed force to a bracket when the first device is lifted relative to the vehicle frame, and the actuator being pivotably connected to the first arm,
wherein the first and second camber angles do not change when the first and second support devices are raised and lowered, and
wherein the first and second support devices are displaceable relative to the vehicle frame independently of each other when the suspension system is attached to the frame.
2. The suspension system according to claim 1 , wherein each of the first and second spindles is rotatable relative to the respective one of the first and second devices.
3. The suspension system according to claim 1 , wherein each of the first and second devices has a respective one of first and second king pins secured thereto, and wherein each of the first and second spindles is pivotably connected to a respective one of the first and second king pins.
4. The suspension system according to claim 1 , wherein the suspension system is steerable by rotating the first and second spindles.
5. The suspension system according to claim 4 , wherein a tie rod connected between the first and second spindles forces the first and second spindles to rotate together.
6. The suspension system according to claim 1 , wherein the first arm is pivotably connected to the bracket.
7. The suspension system according to claim 1 , wherein the bracket is attached to the vehicle frame when the suspension system is attached to the vehicle.
8. The suspension system according to claim 1 , wherein each of the first and second arms is part of a parallel link-type suspension.
9. The suspension system according to claim 1 , further comprising an air spring connected to the first device and configured for attachment to the vehicle frame for downwardly biasing the first device relative to the frame, the air spring having an upper end which is upwardly positioned relative to a lower side of the frame when the suspension system is attached to the frame.
10. The suspension system according to claim 1 , wherein at least one of the first and second arms is made of a composite material.
11. The suspension system according to claim 10 , wherein the composite material is a resin-impregnated fabric.