| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the space and cost of an oil pump for a cab-tilting device. <P>SOLUTION: An oil pump 13 is provided that supplies pressure oil to lifting side and lowering side oil feeding and discharging paths of a tilting cylinder device 3, which is provided between a cab 1 and a frame 2 to tilt the cab 1. The oil pump 13 is provided with: a cylinder 32, in which a cylinder chamber 33 is formed; a piston 34, which is fitted in the cylinder chamber 33 slidably so as to advance and retreat; an intake valve 40, which intakes oil into the cylinder chamber 33 with the movement of the piston 34; and a discharge valve 50, which discharges the oil out of the cylinder chamber 33 with the movement of the piston 34. A holding groove 56 of a V-groove shape is formed on the outside circumference of the cylinder 32. A retaining ring 55, formed in a circular ring shape having a cutout in a part, is fitted inside the holding groove 56. An engagement end 55b of the retaining ring 55 is engaged with an engagement hole 57 to press the action end 55a of the retaining ring 55 against the valve body 54 of the discharge valve 50. <P>COPYRIGHT: (C)2009,JPO&INPIT |
