由于液压挺杆自动调节气门间隙为零间隙，同时可降低发动机噪声。

Because the hydraulic valve plunger automatic control valve clearance is zero gap, simultaneously may reduce the engine noise.

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此外，蜗杆的蜗杆槽深度随压力的增高而减少，在排气结束，星轮齿脱离单槽时，深度为零，故不存在余隙容积。

In addition, the worm and worm groove depth of the pressure increased, in the end, reduce exhaust gate-rotor from the single slot, depth is zero, it does not exist.

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