Double-shaft vacuum pump with synchronization gears
US5035590A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Feb 15, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19972
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A double-shaft vacuum pump with pistons (3,4) rotating without contact in the pump chamber (8) and with synchronization gears (16, 17) located in a side chamber (15). In order to dispense with an oil supply in the side chamber the teeth of the synchronization gears (16, 17) are shaped in such a way that contact between the tooth flanks (26) is limited to the immediate vicinity of the pitch circle (29). If any lubrication is needed, it can be supplied by bearing grease suitable for vacuum applications. The side chamber cover (27) is preferably shaped as a "figure-8" to conform to the peripheries of the synchronization gears (16, 17), and a cooling system for the gears may be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.