| 摘要 |
PROBLEM TO BE SOLVED: To improve the life of parts and a pump by providing piston receiving/ supporting cups integratedly formed with a web material on a cluster bearing, and spacedly providing the cups in the circumferential direction of the web material. SOLUTION: A check valve housing 14 covered with a gallery 16 is provided along a main body 12 of a swash plate type pump, the main body 12 is separately supported with a back plate 20 through a cam spacer 18, and a cavity for the subassembly of a cam 22 is partitioned between both 12,20. A plurality of pistons 26 are fitted in cylinders 28 provided in parallel in the main body 12, and the pistons are reciprocated by cooperation with the cam 22. A cluster bearing 46 is interposed between the cam 22 and the arc-like parts of the pistons 26 so as to guarantee smooth motion of the pistons 26, but in this case, the cluster bearing 46 is formed so that it is provided with a plurality of piston receiving/supporting cups formed into recessed receiving parts receiving the arc-like ends of the pistons 26 spacedly in the circumferential direction. |
