| 摘要 |
PROBLEM TO BE SOLVED: To provide a vane pump capable of preventing lubricating oil from flowing into a pump chamber when a rotor stops and suppressing amount of lubricating oil flowing out while the vane pump operates. SOLUTION: An oil supply channel 12 communicating with the pump chamber 2A is formed above a bearing part 2B of a housing 2, and an external air channel 14 communicating with external air is formed at a position where it rotates by 90°along the bearing part for the oil supply channel. A branched passage 11a branched from an oil passage 11 formed in the axial direction in the direction of diameter of a shaft part and an external air passage 13 formed in the direction crossing the branched passage orthogonally are formed in the shaft part 3B of the rotor 3. The branched passage and the oil supply channel are mutually communicated, and the external air passage and the external air channel are mutually and simultaneously connected. When the oil passage and the oil supply channel are mutually connected while the rotor stops, negative pressure in the pump chamber is eliminated by external air flowing into from the external air passage to prevent large amount of lubricating oil from flowing into the pump chamber. Amount of lubricating oil flowing into the pump chamber when the rotor stops is reduced to prevent breakage of a vane and suppress amount of lubricating oil consumed by rotation of the rotor. COPYRIGHT: (C)2006,JPO&NCIPI
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