Variable displacement gear pump
US4097204A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1977 |
| Grant date | Jun 27, 1978 |
| Priority date | — |
| Expiry date | Apr 22, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C14/22
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An internal-external gear pump wherein the fluid displacement thereof is variable. The internal gear is rotatably driven by a drive shaft about a fixed axis and the external gear is rotatably driven by the internal gear about a controlled movable axis eccentric to the fixed axis. Movement of the external gear axis causes the eccentricity between the internal and external gear axes to vary, thereby resulting in a change in the depth of gear tooth mesh such that the volume of fluid displaced by the meshing teeth is varied. The position of the external gear axis is established by a control ring which rotatably supports the external gear, and is mounted in a stationary housing so as to be rotatably positionable within arcuate limits about a fixed axis eccentric to both the axes of the internal and external gears.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.