US4850832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil pump for automatic transmission with effective sealing arrangement
Assignee: Nissan Motor Co Ltd
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Filing: 1988-03-31
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Granted: 1989-07-25
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Expires: 2008-03-31
Abstract
Abstract A pump housing is formed with a recess receiving therein pump elements, and a pump cover is secured to the pump housing to close the recess. The pump cover and the pump housing define an interface area therebetween formed with a pump discharge port. The pump casing is provided with a predetermined passage which normally serves as an oil pressure delivering passage, but serving as a drain passage under a condition when the oil pump discharge pressure increases. The predetermined passage is open within said interface area via a groove extending around the pump discharge port.
Inventors
- 👤 Kazuya Murota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:09
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/04; F16H57/0434; F04; F04C; F04C15/00; F04C15/0042; F04C15/0046; F16H41/00; F16H41/24; F16H41/30; F16H57/0467; F16H57/0469; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2186
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
An oil pump for an automatic transmission, comprising: a pump casing including a pump housing formed with a recess receiving therein pump elements, and a pump cover secured to said pump housing, said pump cover and said pump housing defining an interface area therebetween; said pump casing being provided with means for defining a predetermined passage which normally serves as an oil pressure delivering passage, said predetermined passage serving as a drain passage under a condition when the oil pump discharge pressure increases, said predetermined passage being open within said interface area.
Claim 2
Dependent Claim
92 words
An oil pump for an automatic transmission, comprising: a pump casing including a pump housing formed with a recess receiving therein pump elements, and a pump cover secured to said pump housing, said pump cover and said pump housing defining an interface area therebetween; said pump casing being provided with means for defining a predetermined passage which normally serves as an oil pressure delivering passage, said predetermined passage serving as a drain passage under a condition when the oil pump discharge pressure increases, said predetermined passage being open within said interface area.
Claim 3
Dependent Claim
39 words
An oil pump as claimed in claim 1, wherein said pump cover is formed with a pump discharge port and said passage defining means include a groove opening at said interface area and extending around said pump discharge port.
Claim 4
Dependent Claim
95 words
In an automatic transmission: an oil pump comprising a pump casing, said pump casing including a pump housing formed with a recess receiving therein pump elements, and a pump cover secured to said pump housing, said pump cover and said pump housing defining an interface area therebetween; said pump casing being provided with means for defining a predetermined passage which normally serves as an oil pressure delivering passage, said predetermined passage serving as a drain passage under a condition when the oil pump discharge pressure increases, said predetermined passage being open within said interface area.
Claim 5
Dependent Claim
95 words
In an automatic transmission: an oil pump comprising a pump casing, said pump casing including a pump housing formed with a recess receiving therein pump elements, and a pump cover secured to said pump housing, said pump cover and said pump housing defining an interface area therebetween; said pump casing being provided with means for defining a predetermined passage which normally serves as an oil pressure delivering passage, said predetermined passage serving as a drain passage under a condition when the oil pump discharge pressure increases, said predetermined passage being open within said interface area.
Claim 6
Dependent Claim
39 words
An automatic transmission as claimed in claim 1, wherein said pump cover is formed with a pump discharge port and said passage defining means include a groove opening at said interface area and extending around said pump discharge port.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |