US5494007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for electrically driving engine valves
Assignee: Motors Liquidation Co
•
Filing: 1994-12-15
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Granted: 1996-02-27
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Expires: 2014-12-15
Abstract
Abstract A cam mechanism is employed to convert motor rotation to reciprocating valve motion. Motor speed is reduced at the valve opening and closing times to reduce stress on the cam mechanism.
Inventors
- 👤 Thaddeus Schroeder
- 👤 Rassem R. Henry
- 👤 Bruno P. B. Lequesne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:13
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/30; F01L9/00; F01L9/20; F01L13/00; F01L13/0005; F01L9/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
In an internal combustion engine having a poppet valve actuated by a rotary electric motor, the method of valve control comprising the steps of: rotating the motor at an average velocity proportional to engine speed; employing a cam mechanism for converting motor rotation to reciprocating valve motion for repetitively opening and closing the valve, the valve having a prescribed lift profile for a constant motor speed; and reducing motor velocity near the transition from a closed valve position to an open valve position to alter the shape of the lift profile when the valve is slightly open and thereby reduce stress on the cam mechanism.
Claim 2
Dependent Claim
105 words
In an internal combustion engine having a poppet valve actuated by a rotary electric motor, the method of valve control comprising the steps of: rotating the motor at an average velocity proportional to engine speed; employing a cam mechanism for converting motor rotation to reciprocating valve motion for repetitively opening and closing the valve, the valve having a prescribed lift profile for a constant motor speed; and reducing motor velocity near the transition from a closed valve position to an open valve position to alter the shape of the lift profile when the valve is slightly open and thereby reduce stress on the cam mechanism.
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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) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |