Gear pump for automatic transmission
US6824486B2 · kind B2 · utility
7Cited by
9References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 17, 2002 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Oct 17, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16N13/20
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An oil film is formed between side faces of a pump gear and side faces of a pump casing to thereby reduce wear and reduce sliding resistance. To form the oil film predetermined numbers of recesses are provided in both side faces of a drive gear and in both side faces of a driven gear of the gear pump. The recesses serve to hold oil. The oil held in the recesses oozes out to between the opposing and contacting side faces to thereby form the oil films therebetween.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.