To facilitate working of an orifice for connecting a discharge port and a suction port of a vane pump in a power transmission gear of a four-wheel drive vehicle.
A side plate 23 is installed between a left vane pump interlocking with differential rotation of front wheels and a left rear wheel, and a right vane pump interlocking with the differential rotation of the front wheels and a right rear wheel, and is provided with a pair of valve plates 31L and 31R provided with the discharge port and the suction port, and a center plate 30 of a sheet shape, which is sandwiched between the both valve plates 31L and 31R. The orifices 62a and 62b arranged in oil passages h13, g10, h14 for connecting the suction port and the discharge port of each vane pump are composed of through-holes formed at the center plate, so that working cost is reduced compared with the case when the orifices 62a and 62b are machined in the right and left valve plates 31L and 31R.
MARUYAMA DAIJI
KITA KANJI
KUROKAWA TAKUYA
KANAMARU YOSHIHIRO
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