| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent cylinder damage, in a pump in which a discharge passageway is formed on a side of a cylinder. <P>SOLUTION: In a connection portion where an inner peripheral surface of a cylinder 13 and an inner peripheral surface of a discharge passageway 13c intersect, there provided is a recess portion 13d depressed outwardly in radial direction from the inner peripheral surface of a cylinder 13. A tensile stress in circumferential direction of the cylinder acting on the proximity of the connection portion by a pressure of fluid of a pump chamber 15 is transmitted and distributed along a boundary line between the inner peripheral surface of a cylinder 13 and the recess portion 13d. As a consequence, the tensile stress in circumferential direction of the cylinder generated in the connection portion is reduced, thus preventing damage to the cylinder 13. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
