| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent falling-off of a cover body by a pressure difference between the inside and outside of a housing, in an oil pump for respectively sealing a pair of ports opened and formed in the housing by the cover body. <P>SOLUTION: A cap 28 being the cover body for sealing a suction port 25 formed in the housing 2, is formed of soft vinyl chloride being an elastic material, and pinholes 31 are penetratingly formed in the cap 28. The pinholes 31 close to restrain the outflow of a hydraulic fluid to an external part when the pressure difference between the inside and outside of the housing 2 is a predetermined value or less. The pinholes open with elastic deformation of the cap 28 itself when the pressure difference between the inside and outside of the housing 2 exceeds the predetermined value when pressure in the housing 2 becomes higher than external pressure, and reduce the pressure in the housing 2 by exhausting air in the housing 2 to the external part. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
