| 摘要 |
A pump comprises a housing having a shaft bore and a pump chamber, a bearing provided for an inner periphery of the shaft bore, a shaft rotatively supported by the shaft bore through the bearing, and a transporting member connected to one end portion of the shaft for transporting fluid by imparting mechanical energy to the fluid sucked in said pump chamber. The bearing is constituted as a sliding bearing, a first region of a sliding surface formed to the sliding bearing is communicated with a high-pressure portion to be formed so as to provide a high pressure when constructed as a fluid passage, while a second region of the sliding surface formed to the sliding bearing is communicated with a low-pressure portion to be formed so as to have a relatively lower pressure than that of the high-pressure portion when constructed as a fluid passage, so that the fluid is supplied to the sliding surface of said sliding bearing by the action of a differential pressure between the high-pressure portion and the low-pressure portion of the fluid passage so as to lubricate the sliding surface.
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