Patent US5347968A successfully refreshed from Google Patents.
US5347968A
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US
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Integral air compression system
Assignee: Caterpillar Inc
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Filing: 1993-05-24
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Granted: 1994-09-20
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Expires: 2013-05-24
Abstract
Abstract Air compression systems for internal combustion engines are utilizing an integral part of the engine to produce the compressed air necessary for operating the brakes of a vehicle. The ability to produce compressed air from an integral part of the engine is important in order to reduce the cost and weight associated with the engine and to increase performance capability and reliability. The integral air compression system includes a valve means associated with one of a plurality of combustion chambers. A housing is connected to a cylinder head and has first and second bore. A master piston is disposed within the first bore to define a first oil chamber. A slave piston is disposed within the second bore to define a second oil chamber. A means fluidly connects the first and second oil chambers. The master piston is forced toward the first oil chamber when another one of the combustion chambers is in the exhaust stroke. The second oil chamber becomes pressurized and forces the slave piston to open the valve means during the compression stroke of the one combustion chamber allowing compressed air to flow through a passage in the head and into a storing means. A means for monitoring the pressure in the storing means is utilized to control the integral air compression system.
Inventors
- 👤 John L. Johnson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:48
CPC Classifications
F; F04; F04B; F04B41/00; F04B41/04; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
180 words
An integral air compression system for an internal combustion engine having a block defining a plurality of cylinders, a head mounted in closing relation to the cylinder block to define a plurality of combustion chambers, a piston reciprocally disposed within each of the cylinders and movable between top dead center and bottom dead center positions sequentially defining an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke, and exhaust means operatively associated with each combustion chamber for permitting a flow of gas out of the combustion chamber during the exhaust stroke, comprising: means defining a passage in the head in communication with one of the plurality of combustion chambers; valve means for controlling communication between the one combustion chamber and the passage, the valve means being movable between closed and open positions; means for selectively moving the valve means to the open position to permit a flow of air out of the one combustion chamber during the compression stroke; and means connected to the passage for storing the flow of air expelled from the one combustion chamber.
Claim 2
Dependent Claim
180 words
An integral air compression system for an internal combustion engine having a block defining a plurality of cylinders, a head mounted in closing relation to the cylinder block to define a plurality of combustion chambers, a piston reciprocally disposed within each of the cylinders and movable between top dead center and bottom dead center positions sequentially defining an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke, and exhaust means operatively associated with each combustion chamber for permitting a flow of gas out of the combustion chamber during the exhaust stroke, comprising: means defining a passage in the head in communication with one of the plurality of combustion chambers; valve means for controlling communication between the one combustion chamber and the passage, the valve means being movable between closed and open positions; means for selectively moving the valve means to the open position to permit a flow of air out of the one combustion chamber during the compression stroke; and means connected to the passage for storing the flow of air expelled from the one combustion chamber.
Claim 3
Dependent Claim
35 words
The integral air compression system as in claim 1, wherein the moving means includes means for timing the opening of the valve means during the compression stroke of the piston of the one combustion chamber.
Claim 4
Dependent Claim
27 words
The integral air compression system as in claim 2, wherein the timing means is operatively associated with the exhaust means on another one of the combustion chambers.
Claim 5
Dependent Claim
51 words
The integral air compression system as in claim 3, including a housing connected to the cylinder head, the housing having a first bore operatively associated with the timing means and positioned substantially over said another one of the combustion chambers and a second bore operatively associated with the one combustion chamber.
Claim 6
Dependent Claim
54 words
The integral air compression system as in claim 4, wherein the moving means includes a master piston slidably disposed within the first bore and operatively associated with the timing means to define a first oil chamber and a valve being movable between a first and a second position fluidly connected to the connecting means.
Claim 7
Dependent Claim
38 words
The integral air compression system as in claim 5, wherein the moving means includes a slave piston in contacting relationship with the valve means and being slidably disposed in the second bore to define a second oil chamber.
Claim 8
Dependent Claim
21 words
The integral air compression system as in claim 6, including means for fluidly connecting the first and the second oil chambers.
Claim 9
Dependent Claim
27 words
The integral air compression system as in claim 7, including means for maintaining the fluid level within the connecting means and the first and second oil chambers.
Claim 10
Dependent Claim
24 words
The integral air compression system as in claim 8, wherein the maintaining means includes the valve selectively controlling fluid communication with the connecting means.
Claim 11
Dependent Claim
82 words
The integral air compression system as in claim 9, wherein the timing means includes an exhaust bridge connected to the master piston and the exhaust means on said another one of the combustion chambers, the exhaust bridge being operatively associated with the master piston for pressurizing the fluid in the connecting means and the first and second oil chambers during the exhaust stroke of the piston of said another one of the combustion chambers when the valve is in the first position.
Claim 12
Dependent Claim
21 words
The integral air compression system as in claim 10, including means for resiliently biasing the valve means to the closed position.
Claim 13
Dependent Claim
44 words
The integral air compression system as in claim 11, including means for monitoring the engine load and the the pressure within the storing means so that at preestablished load and pressure conditions the valve may be moved to the first and the second positions.
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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) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |