| 摘要 |
PURPOSE:To reduce the starting load of a transmission gear by providing a motor cylinder with an oil discharging means to discharge oil in an oiltight chamber according to decrease in oil pressure in the oiltight chamber. CONSTITUTION:The second part 8b in a motor cylinder 8 is drillingly provided with a discharge hole 185 to enable the second chamber 31b of an oiltight chamber 31 to communicate with an oil tank on a bottom in a transmission case, and the discharge hole 185 is provided with a throttle member 186 functioning as an oil discharging means. Thus, when an input shaft 2 has stopped, oil pressure in the oiltight chamber 31 lowers according to decrease in the quantity of oil leaking from the slidably contacting part of a hydraulic pump P into the oiltight chamber 31, and the function of the throttle member 186 corresponding to the above decrease in the oil pressure discharges the oil in the oiltight chamber 31. The oil quantity in the oiltight chamber 31 has therefore decreased in starting the input shaft 2. Consequently, agitation resistance due to a pump plunger 6 can be decreased for reduction in the starting load of a transmission gear.
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