| 摘要 |
<p>PURPOSE: To suppress seizure and wear of a plunger and a slide contact member mating therewith as a cost is reduced as much as possible. CONSTITUTION: A plunger type hydraulic pump is hydraulic pumps 2 and 3 having plungers 2a and 3a brought into contact with the outer peripheral surface of a cam 4 made of a metal mounted on one end of the output shaft 1a of an electric motor 1 and vertically moved along with eccentric rotation of the cam 4. Balls 6 made of ceramics are rotatably held, in a state to be incapable of falling off, on the tip sides of plungers 2a and 3a, namely, the slide contact side with the cam 4.</p> |
