US3881399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam engine with improve inlet valve arrangement
Assignee: Motors Liquidation Co
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Filing: 1970-04-29
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Granted: 1975-05-06
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Expires: 1990-04-29
Abstract
Abstract A piston type steam engine expander of the high speed, variable speed type having a poppet steam inlet valve and cylinder outlet ports and operable over a wide speed range on a throttled steam supply includes valve mechanism arranged to actuate the inlet valve through a fixed lift curve which provides a substantial change in effective steam cutoff at various speeds, as well as providing advantageous valve opening characteristics. Operating advantages similar to those of variable opening and closing inlet valves are provided by the use of a long valve open period including early opening and late closing of the valve, combined with unusually slow valve motion in the early stages of opening and the final stages of closing.
Inventors
- 👤 Charles J Sagi
- 👤 Charles A Amann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:55
CPC Classifications
F; F01; F01B; F01B25/00; F01B25/02; F01B17/00; F01B17/02; F01B17/04; F01L; F01L31/00; F01L31/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder and connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to require a crank angle change of at least 18% of the total crank angular movement during the valve closing period to move the valve through the final 5% of its closing motion.
Claim 2
Dependent Claim
144 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder and connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to require a crank angle change of at least 18% of the total crank angular movement during the valve closing period to move the valve through the final 5% of its closing motion.
Claim 3
Dependent Claim
161 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder anD connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to maintain said valve open until at least about 60* after the piston top center position and to require a crank angle change of at least 18% of the total crank angular movement during the valve closing period to move the valve through the final 5% of its closing motion.
Claim 4
Dependent Claim
161 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder anD connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to maintain said valve open until at least about 60* after the piston top center position and to require a crank angle change of at least 18% of the total crank angular movement during the valve closing period to move the valve through the final 5% of its closing motion.
Claim 5
Dependent Claim
160 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder and connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to begin valve opening not less than about 25* before the piston top center position and to require a crank angle change of at least 18% of the total crank angular movement during the valve opening period to move the valve through the initial 5% of its opening motion.
Claim 6
Dependent Claim
160 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder and connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to begin valve opening not less than about 25* before the piston top center position and to require a crank angle change of at least 18% of the total crank angular movement during the valve opening period to move the valve through the initial 5% of its opening motion.
Claim 7
Dependent Claim
189 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder and connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to begin valve opening not less than about 25* before the piston top center position, to complete valve closing not less than about 60* after the piston top center position and to provide a valve lift curve in which at least 9% of the angular crank motion during which the valve is open is required to move the valve through the initial 5% of its opening motion, as well as through the final 5% of its closing motion.
Claim 8
Dependent Claim
189 words
A steam engine expander of the type having a cylinder, a piston movable in said cylinder and connected with a crank mechanism for the delivery of power, a steam inlet opening in a wall of said cylinder and connecting said cylinder with a throttled supply of steam for operation of said engine over a varied speed range, a poppet inlet valve adapted to close said opening and movable between open and closed positions, and valve actuating mechanism operable to open and close said valve on a predetermined lift curve fixed with respect to the engine piston motion and the respective angular positions of the crank mechanism, said valve mechanism being arranged to begin valve opening not less than about 25* before the piston top center position, to complete valve closing not less than about 60* after the piston top center position and to provide a valve lift curve in which at least 9% of the angular crank motion during which the valve is open is required to move the valve through the initial 5% of its opening motion, as well as through the final 5% of its closing motion.
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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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |