Variable-delivery external gear pump
US6283735A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1999 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Oct 13, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C2/18
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable-delivery external gear pump comprising PA1 a casing, PA1 at least one rotatively driven pair of gears comprising two intermeshing spur gears, which form with shell surface areas of the casing and axial sealing surface areas a delivery space comprising a low-pressure side connected to a pump inlet port and a high-pressure side connected to a pump outlet port, and PA1 a piston, serving to rotatively mount one spur gear of the pair of gears, said piston being shifted relative to the other spur gear of the pair of gears so as to vary the delivery of the pump together with the one spur gear by charging the high-pressure side with fluid against the force of a return element, wherein PA2 formed in at least one axial sealing surface area adjoining a sealing land of the sealing surface area is at least one pocket connecting a zone of deepest tooth engagement of the spur gears to either the pump outlet port or the pump inlet port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.