On the base of sensibility analysis, an optimization for tensioner is performed with the lowest sensibility of system natural frequency as the objective.

This paper introduces the design of EBZ135 roadheader walking mechanism, including the drive system, pedrail and pedrail support mode, pedrail tightening device.

This paper presents a new design of hydro extender VVT mechanism. The best matching inlet valve closing timing for advancement and retarding is achieved by the experiments.