Patent US1741978A successfully refreshed from Google Patents.
Patent US4122818A successfully refreshed from Google Patents.
US4122818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil circulating and cooling system
Assignee: Toyota Motor Corp
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Filing: 1976-05-12
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Granted: 1978-10-31
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Expires: 1996-05-12
Abstract
Abstract An oil circulating and cooling system for an internal combustion engine having an oil pump to pump the oil under pressure throughout the oil distribution system of the internal combustion engine and an oil pressure regulation circuit in parallel with the oil distribution system of the internal combustion engine. The oil pressure regulation circuit comprises a relief valve for diverting a portion of the oil from the oil pump to the oil pressure regulation circuit thereby setting the maximum value of the oil pressure throughout the oil distribution system of the internal combustion engine and an oil cooler for cooling the oil which has been diverted to the oil pressure regulation circuit. Since the oil temperature and oil pressure at the output of the oil pump increase with increased engine rpm, the oil is only cooled when the engine rpm is high.
Inventors
- 👤 Kyo Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:57
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/02; F02; F02B; F02B2275/00; F02B2275/08; F16; F16N; F16N2270/00; F16N2270/60; F16N2270/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
An oil circulating and cooling system for an internal combustion engine of the type having an oil pan and an oil distribution system comprising: an oil pump to pump oil under pressure throughout the oil distribution system of said internal combustion engine; a valve means coupled to the output of said oil pump for diverting a portion of said oil from said oil pump when the oil pressure from said oil pump is some predetermined value; a half arc chain seat for a crank timing gear to hold said diverted oil from said valve means, said half arc seat and said valve means arranged and configured such that said diverted oil is applied directly to the crank timing gear to said half arc seat, and to said timing chain whereby as the timing chain revolves the diverted oil from said valve means is thrown from said timing chain and flows down the cam shaft cover, the cylinder head, and the timing chain cover and returns to the oil pan thereby cooling the oil.
Claim 2
Dependent Claim
173 words
An oil circulating and cooling system for an internal combustion engine of the type having an oil pan and an oil distribution system comprising: an oil pump to pump oil under pressure throughout the oil distribution system of said internal combustion engine; a valve means coupled to the output of said oil pump for diverting a portion of said oil from said oil pump when the oil pressure from said oil pump is some predetermined value; a half arc chain seat for a crank timing gear to hold said diverted oil from said valve means, said half arc seat and said valve means arranged and configured such that said diverted oil is applied directly to the crank timing gear to said half arc seat, and to said timing chain whereby as the timing chain revolves the diverted oil from said valve means is thrown from said timing chain and flows down the cam shaft cover, the cylinder head, and the timing chain cover and returns to the oil pan thereby cooling the oil.
Claim 3
Dependent Claim
36 words
An oil circulating and cooling system according to claim 1 wherein at least one of the cam shaft cover, the cylinder head and timing chain cover is formed in a low temperature area of said engine.
Claim 4
Dependent Claim
24 words
An oil circulating and cooling system according to claim 2 wherein said low temperature area is formed in the front portion of said engine.
Claim 5
Dependent Claim
25 words
An engine oil circulating and cooling system according to claim 3 wherein said oil pump is disposed in the front bottom portion of the engine.
Claim 6
Dependent Claim
19 words
An engine oil circulating and cooling system according to claim 4 wherein said valve means comprises a relief valve.
Claim 7
Dependent Claim
21 words
An engine oil circulating and cooling system according to claim 5 wherein said relief valve is formed in said oil pump.
Claim 8
Dependent Claim
22 words
An engine oil circulating and cooling system according to claim 6 wherein said oil pump is an internally driven gear type pump.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |