| 摘要 |
PROBLEM TO BE SOLVED: To easily regulate the bearing of the contact parts of cam rings and side plates of a pair of vane pumps without using a shim in a hydraulic coupling device of a power transmission for a four-wheel drive vehicle. SOLUTION: The cam rings 31L, 31R and the side plates 30L, 30R, 32 are arranged in the laminated state inside a pump casing 24 constituted by connecting a left casing 21 of nearly plate shape to an opening of a right casing 22 of nearly bottomed cylinder shape, and an external thread formed on the outer periphery of the side plate 30L adjacent to the left casing 21 is thread- connected (63) to an internal thread formed on the inner periphery of the opening of the right casing 22. The side plate 30L adjacent to the left casing 21 is thereby moved axially by the screwing of the external thread and internal thread to optionally regulate the contact bearing of the cam rings 31L, 31R and side plates 30L, 30R, 32 in the laminated state without needing to embed and fasten a spacer and a plurality of bolts, thus ensuring sealing performance.
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