| 摘要 |
A construction vehicle, such as a motor grader, comprises a frame having a pair of tandem roadwheel assemblies mounted on each lateral side thereof. Each roadwheel assembly comprises a pair of tandem roadwheels each rotatably mounted on an outer end of a lever arm which has its inner end pivotally mounted on the frame of the vehicle. A double-acting hydraulic cylinder is pivotally interconnected between the lever arms to selectively pivot the roadwheels to adjust the vertical height of one side of the vehicle relative to the other side thereof. An accumulator is preferably connectable with the cylinder to provide a damped suspension spring for absorbing road shocks and the like. Each of the roadwheels is preferably driven by a gear train connected to a driven output shaft of the engine of the vehicle. In a first embodiment of this invention, the inner end of each lever arm is pivotally mounted at a separate pivot point on the frame of the vehicle whereas in a second embodiment thereof the lever arms are pivotally mounted at a common pivot point on the frame.
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