一对相互啮合的齿轮和泵缸把吸入腔和排出腔隔开。
A pair meshes mutually the gear and the fluid cylinder and discharge the suction chamber the cavity to separate.
但是，在自动变速器里，齿轮不需要滑动，所有齿轮相互之间保持啮合状态，换挡是通过行星齿轮的控制来实现的。
In an automatic transmission, however, the gears are never physically moved and are always engaged to the same gears. This is accomplished through the use of planetary gear sets.
八个活塞体来回内外运动，带动曲轴连续旋转，再通过多对锥齿轮相互啮合的方式，实现动力的输出。
The 8 piston bodies move to and fro, in and out, and drive the crankshaft to rotate continuously, then the power is output by the engagement of conic gears.
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