| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high pressure pump that can be reduced in the weight of housings, and can sufficiently secure a sealing property between a cylinder and the housings. <P>SOLUTION: The combustion pressure of a pressurization chamber 14 is received by a cylinder inner wall 131 and a plunger 51 in a pressurization stroke of the high pressure pump 1. Alternatively, since the upper housing 15 does not directly receive an operation force generated by the combustion pressure of the pressurization chamber 14, the housing can be thinned in thickness and reduced in weight. Furthermore, the cylinder 13 is formed with a bottom 132, a tubular part 133 and a large-diameter tubular part 134. When manufacturing the high pressure pump 1, the bottom 132 and the tubular part 133 do not contact with the lower housing 11 when inserting the cylinder 13 into the lower cylinder 11. By this arrangement, the upper housing 15 can be inserted into the bottom 132 and the tubular part 133 while maintaining the accuracy of the bottom 132 and the external peripheral wall of the tubular part 133, and a high fluid-tight property can be secured between and among the bottom 132, the tubular part 133 and a small inside-diameter engagement hole 151. <P>COPYRIGHT: (C)2013,JPO&INPIT |
