| 摘要 |
PURPOSE: To reduce side load for ensuring the guide of a piston shoe under super high pressure by providing a slide surface for a part of a piston stroke guide surface to the piston shoe so as to receive a lubricant filling an interior space of a housing by the slide surface. CONSTITUTION: A piston 5 is driven by a piston shoe 447. The piston shoe 447 is pivotably mounted on a part of piston 5, and pivoted eccentrically by a piston stroke guide surface 570 of an eccentric cam 444. The eccentric cam 444 is rotated by a shaft 445 rotated in a housing 442. The piston shoe 447 has a slide surface 465 which compensates for a part of the piston stroke guide surface 570. The slide surface 465 receives the lubricant filling an interior space of the housing 442, and is expanded to cover over 90 deg. on the piston stroke guide surface 570. Thus, a high pressure water pump can work under a pressure above 1000 atmospheric pressure. |
