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The articulated dump truck with independent suspensions is driven by six AC motors and each wheel is driven by one motor. Cooling system is configured in every electric wheel. The motor is the main heating source in the electric drive system. Hence, the cooling of the motor will affect the reliability and power-density of the whole electric drive system. According to the actual working conditions, the heating calculation about the cooling system has been carried out during the design process. The design concept of embedding spiral-shaped flow path in the shell of the stator has been drawn. The cooling water could pass through the path and accomplish cooling outside the stator. In this paper, the FLUENT has been used for the 3-D numerical simulation of the cooling system. The temperature field distributions of the cooling water and the shell are obtained.

This paper reports on an investigation of articulated dump trucks vibration analysis and rear suspension stiffness sensitivity analysis. Since the frame of the off-highway dump truck is integrated, the impact from the road surface against the rear wheel is transmitted to the cab directly through the hydro pneumatic suspension and the frame, and finally contributes to the ride comfort. Articulated dump trucks are different from rigid-frame off-highway dump trucks, with the frame divided into two parts and jointed by a hinge, which forms two degrees of freedom between the two parts. Compared with rigid-frame dump trucks, the impact from the road surface against the rear wheel of the articulated truck would not transmit directly to the cab through the frame for the attenuation effect of the hinge. This paper studies the truck mass centre vibration characteristic which shows the resonance frequency of the articulated dump truck.