汽车专业英语6

The transmission gears are shifted by means of a gear shift mechanism. The gear shift mechanism consists of a lever, shift rails, shift forks, retainers, locks and a reverse speed safety device. The shift lever mounted on the transmission cover has a spherical bulb housed in a socket in the cover drillings accommodate shift rails which carry the shift forks and shift blocks with slots. The lower end of the lever enters the slots of the shift blocks. The forks fit into the grooves of the sliding gears and synchronizer sleeves. To change a speed, the upper end of the lever is slid to a certain position, the lower end of the lever moves the shift block and the latter pushes the shift rail with the fork and gear until the required speed is engaged. Retainers keep the gears in the engaged or neutral positions.
The retainer consists of a ball and a spring accommodated in a channel drilled in the transmission cover. The shift rail has slots whose number is equal to that of speeds enga

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