Gear coatings for rotary gear pumps
US5993183A · kind A · utility
41Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Sep 11, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49242
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Gears for pumping non-lubricating fluids at high pressure are provided which include special coatings. One of the gears is coated with a combination of nickel and polytetrafluoroethylene; the other gear is coated with a combination of carbon and tungsten carbide. Because the coatings are different and have different hardnesses, galling is prevented. Preferably, the gears are fabricated from stainless steel and, therefore, in the event a scratch or nick in the coating is produced, corrosion is prevented. The gears are useful for gear pumps used to pump fire fighting liquids and foam at high pressures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.