| 摘要 |
A drive unit comprising a transmission with two coaxial bevel gears ( 11, 12 ) fitted opposite one another on the same engine shaft ( 10 ), which engage a bevel gear ( 13 ) fitted to a shaft ( 14 ) perpendicular to the preceding one, a device designed to mesh the engine shaft with one or other of the bevel gears, constituted by clutches ( 20, 21 ) housed in the body of the bevel gears ( 12, 11 ) and controlled by a pressurised fluid, wherein pipes ( 24, 25 ), designed to convey the pressurised fluid, are formed in the engine shaft ( 10 ), wherein, in order to supply pressurised oil to the pipes ( 24, 25 ), an axial inlet pipe ( 34 ) is formed in the head of the engine shaft ( 10 ), which the axial pipe ( 34 ) feeds a distributor ( 35 ) constituted by a valve that slides on the engine shaft, which the slide valve ( 35 ) can move between two positions in which it places the input pipe ( 34 ) in communication with one of the pipes ( 24, 25 ).
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