At the beginning of 20 centuries appeared by individual motor drive with gear transmission of the lathe.

20世纪初出现了由单独电机驱动的带有齿轮变速箱的车床。

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The clutch is also used to disengage the engine from the drive train whenever the gears in the transmission are being shifted from gear ratio to another.

此外，在改变变速器齿轮的传送比时(换档时)，离合器也被用于切断传动系与发动机之间的连接。

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The basic types of gear transmission are external and internal cylindric gear drive, bevel gear drive, worm gear drive.

外啮合圆柱齿轮、内啮合圆柱齿轮、圆维齿轮和蜗轮蜗杆传动是齿轮传动的基本形式。

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One possible use of this technology is to provide context information from the car, something like the engine speed has reached 2000 rpm, the parking brake has been disengaged, the transmission gear is in drive and the brake pedal is fully off the floor.

FORBES: Automotive/Tech Companies Trying to Bring the Web to the Car