Axial piston pump
US5230610A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1990 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Mar 30, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B1/16
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An axial piston pump for supplying two separate oil circuits including two pistons units (6, 8) of which one is situated upon an external circle and the other upon an internal circle. The external piston unit (6) must be regulatable so that it can feed a hydromotor of a radiator fan. The internal piston unit (8) must supply a level regulation with a constant flow of oil. Accordingly, both piston units (6 and 8) suck oil via separate suction bores (11 and 26). In the suction bore (11) of the external piston unit (6) leading to the swash-plate chamber (4) is inserted an electromagnetically actuable controlling valve (12). In order that the pistons (5) of the external piston unit (6) cannot run dry when the controlling valve (12) is regulated, there branches off from the suction bore (11), upstream of the controlling valve (12), a constant-flow bore (23) which via an annular groove (24) and radial bores (25) supplies a relatively small amount of oil to each piston (5) in the dead-center position thereof. The pistons (7) of the internal piston unit (8) receive the oil via an annular groove (27) branching off from the suction bore (26) and discharging in the cylinder chambers (7A) via r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.