Wheel driving state stability, crawler cranes

Traveling state stability, including driving and driving state status longitudinal stability both lateral stability.
① traveling state longitudinal stability
semi gantry crane design provisions allowed the aircraft climbing angle, when the slope angle exceeds the predetermined value, the front wheel pressure may become zero. In this case, the crane will not control the steering, with the loss of stability of the crane is called; sliding force when the crane on the ramp on the close adhesion of the drive wheels, the wheel slippage occurs, so that the vehicle can not uphill, which is a phenomenon loses stability. When possible after overturning crawler crane uphill along the axis of tipping, possibly before tipping downhill along the overturning axis, but also lost running longitudinal stability.
② traveling state lateral stability
Mainly wheel gantry crane traveling when cornering, by turning the centrifugal force, the role of the lateral wind, as well as the role of the lateral component and adhesion crane gravity. When these forces are out of balance, the crane will be lateral skid or rollover, which is the loss of lateral stability. Visible, cranes in ensuring the longitudinal and transverse instability of the state is not in order to maintain normal driving.