US5931131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve cover assembly having an integrated heat exchanger for cooling exhaust gases
Assignee: Caterpillar Inc
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Filing: 1997-08-19
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Granted: 1999-08-03
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Expires: 2017-08-19
Abstract
Abstract A method of covering a valve and rocker arm area of an internal combustion engine is disclosed. The engine includes an engine exhaust outlet and an engine air inlet. The method includes the step of providing a valve cover assembly which includes a housing having a chamber defined therein, and a conduit positioned in the chamber. The conduit connects the engine exhaust outlet to the engine air inlet. The method also includes the step of securing the valve cover assembly to the engine so that the cover portion of the valve cover assembly covers the valve and rocker arm area. The method further includes the step of advancing exhaust gas from the engine exhaust outlet to the engine air inlet through the conduit. The method still further includes the step of advancing fluid through the housing so as to cool the conduit. A valve cover assembly for use on an internal combustion engine is also disclosed.
Inventors
- 👤 David E. Hackett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:51
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/10; F02M35/10006; F02M35/10078; F02B; F02B47/00; F02B47/04; F02B47/08; F02F; F02F7/00; F02F7/006; F02M26/00; F02M26/13; F02M26/22; F02M26/29; F02M26/30; F02M35/104; F02M35/112; F02B2275/00; F02B2275/34; F02B3/00; F02B3/06; F02F1/00; F02F1/24; F02F2001/244; F02F2001/247; F02M26/32; F02M35/10209; F02M35/10222; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
119 words
A method of covering a valve and rocker arm area of an internal combustion engine, the engine having an engine exhaust outlet and an engine air inlet, comprising the steps of: providing a valve cover assembly which includes (1) a housing having a chamber defined therein, and (2) a conduit positioned in the chamber, the conduit connecting the engine exhaust outlet to the engine air inlet; securing the valve cover assembly to the engine so that the cover portion of the valve cover assembly covers the valve and rocker arm area; advancing exhaust gas from the engine exhaust outlet to the engine air inlet through the conduit; and advancing fluid through the housing so as to cool the conduit.
Claim 2
Independent Claim
119 words
A method of covering a valve and rocker arm area of an internal combustion engine, the engine having an engine exhaust outlet and an engine air inlet, comprising the steps of: providing a valve cover assembly which includes (1) a housing having a chamber defined therein, and (2) a conduit positioned in the chamber, the conduit connecting the engine exhaust outlet to the engine air inlet; securing the valve cover assembly to the engine so that the cover portion of the valve cover assembly covers the valve and rocker arm area; advancing exhaust gas from the engine exhaust outlet to the engine air inlet through the conduit; and advancing fluid through the housing so as to cool the conduit.
Claim 3
Dependent Claim
80 words
The method of claim 1, wherein the housing of the valve cover assembly defines a coolant inlet, a coolant outlet, further comprising the steps of: providing a water pump having a pump inlet and a pump outlet; and operating the water pump so as to advance fluid (1) from the pump outlet of the water pump to the coolant inlet of the housing, and (2) from the coolant outlet of the housing to the pump inlet of the water pump.
Claim 4
Dependent Claim
62 words
The method of claim 1, wherein: the housing of the valve cover assembly further defines a housing exhaust inlet and a housing exhaust outlet, and the exhaust advancing step includes the steps of (1) advancing exhaust gas from the engine exhaust outlet to the housing exhaust inlet, and (2) advancing exhaust gas from the housing exhaust outlet to the engine air inlet.
Claim 5
Dependent Claim
36 words
The method of claim 3, wherein: the conduit includes a serpentine segment which is located within the housing, and the fluid advancing step includes the step of advancing fluid through the serpentine segment of the conduit.
Claim 6
Dependent Claim
71 words
The method of claim 1, wherein: the housing has a first aperture defined therein, the internal combustion engine includes an engine head having a second aperture defined therein, and the securing step includes the steps of (1) aligning the first aperture with the second aperture, and (2) positioning a fastener in both the first aperture and the second aperture so as to secure the valve cover assembly to the engine head.
Claim 7
Dependent Claim
85 words
An engine assembly, comprising: an internal combustion engine having a valve and rocker arm area; a housing having a chamber defined therein, said housing further defining a coolant inlet, a coolant outlet, a first housing exhaust inlet, and a first housing exhaust outlet, said housing further having a cover portion mounted to said engine so as to cover said valve and rocker arm area; and a first conduit positioned in said chamber which connects said first housing exhaust inlet to said first housing exhaust outlet.
Claim 8
Dependent Claim
85 words
An engine assembly, comprising: an internal combustion engine having a valve and rocker arm area; a housing having a chamber defined therein, said housing further defining a coolant inlet, a coolant outlet, a first housing exhaust inlet, and a first housing exhaust outlet, said housing further having a cover portion mounted to said engine so as to cover said valve and rocker arm area; and a first conduit positioned in said chamber which connects said first housing exhaust inlet to said first housing exhaust outlet.
Claim 9
Dependent Claim
52 words
The engine assembly of claim 6, wherein said engine includes an engine air inlet and an engine exhaust outlet, further comprising: a first tube connected between said engine exhaust outlet and said first housing exhaust inlet; and a second tube connected between said first housing exhaust outlet and said engine air inlet.
Claim 10
Dependent Claim
57 words
The engine assembly of claim 7, further comprising a water pump having a pump inlet and a pump outlet, wherein: said pump outlet of said water pump is in fluid communication with said coolant inlet of said housing, and said coolant outlet of said housing is in fluid communication with said pump inlet of said water pump.
Claim 11
Dependent Claim
20 words
The engine assembly of claim 6, wherein said first conduit includes a serpentine segment which is located within said housing.
Claim 12
Dependent Claim
44 words
The engine assembly of claim 6, wherein said housing further defines a second housing exhaust inlet and a second housing exhaust outlet, further comprising: a second conduit positioned in said chamber which connects said second housing exhaust inlet to said second housing exhaust outlet.
Claim 13
Dependent Claim
66 words
The engine assembly of claim 6, further comprising a fastener, wherein: said housing has a first aperture defined therein, said internal combustion engine includes an engine head having a second aperture defined therein, said first aperture is aligned with said second aperture, and said fastener is positioned in both said first aperture and said second aperture so as to secure said housing to said engine head.
Claim 14
Dependent Claim
79 words
A valve cover assembly for use on an internal combustion engine, comprising: a housing having a chamber defined therein, said housing further defining a coolant inlet, a coolant outlet, a first housing exhaust inlet, and a first housing exhaust outlet, said housing further having a cover portion which covers a valve and rocker arm area of said engine; and a first conduit positioned in said chamber which connects said first housing exhaust inlet to said first housing exhaust outlet.
Claim 15
Dependent Claim
79 words
A valve cover assembly for use on an internal combustion engine, comprising: a housing having a chamber defined therein, said housing further defining a coolant inlet, a coolant outlet, a first housing exhaust inlet, and a first housing exhaust outlet, said housing further having a cover portion which covers a valve and rocker arm area of said engine; and a first conduit positioned in said chamber which connects said first housing exhaust inlet to said first housing exhaust outlet.
Claim 16
Dependent Claim
21 words
The valve cover assembly of claim 12, wherein said first conduit includes a serpentine segment which is located within said housing.
Claim 17
Dependent Claim
45 words
The valve cover assembly of claim 12, wherein said housing further defines a second housing exhaust inlet and a second housing exhaust outlet, further comprising: a second conduit positioned in said chamber which connects said second housing exhaust inlet to said second housing exhaust outlet.
Claim 18
Dependent Claim
65 words
The valve cover assembly of claim 12, further comprising a fastener, wherein: said housing has a first aperture defined therein, said internal combustion engine includes an engine head having a second aperture defined therein, said housing is securable to said engine head, and said housing is secured to said engine head when said fastener is positioned in both said first aperture and said second aperture.
Claim 19
Dependent Claim
90 words
The valve cover assembly of claim 12, wherein: said housing is securable to said internal combustion engine, said internal combustion engine includes a water pump having a pump inlet and a pump outlet, said pump outlet of said water pump is in fluid communication with said coolant inlet of said housing when said housing is secured to said internal combustion engine, and said coolant outlet of said housing is in fluid communication with said pump inlet of said water pump when said housing is secured to said internal combustion engine.
Claim 20
Dependent Claim
77 words
The valve cover assembly of claim 12, wherein: said internal combustion engine includes an engine air inlet and an engine exhaust outlet, said housing is securable to said internal combustion engine, said first conduit is in fluid communication with said engine exhaust outlet when said housing is secured to said internal combustion engine, and said first conduit is further in fluid communication with said engine air inlet when said housing is secured to said internal combustion engine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-08-02 | 2003-02-01 | 2003-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-02 | 2007-02-01 | 2007-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-02 | 2011-02-01 | 2011-08-03 | $7700.00 | Window Closed / Lapsed |