US5448973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing the pressure and energy consumption of hydraulic actuators when activating engine exhaust valves
Assignee: Eaton Corp
•
Filing: 1994-11-15
•
Granted: 1995-09-12
•
Expires: 2014-11-15
Abstract
Abstract A method of operating at least two exhaust valves in an engine cylinder using a four-way hydraulic actuator to open a first exhaust valve and after a time delay using a three-way hydraulic actuator to open a second exhaust valve to minimize the overall energy consumption in operating engine valves using hydraulic actuators.
Inventors
- 👤 Lawrence L. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:08
CPC Classifications
F; F01; F01L; F01L9/00; F01L9/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A method of operating at least two exhaust valves in an engine cylinder comprising: providing a four-way hydraulic actuator attached to a first exhaust valve; providing a three-way hydraulic actuator attached to a second exhaust valve; providing a source of pressurized oil to said four-way hydraulic actuator and to said three-way hydraulic actuator; opening said four-way hydraulic actuator; then opening said three-way hydraulic actuator when the pressure in said engine cylinder has been substantially lowered.
Claim 2
Independent Claim
75 words
A method of operating at least two exhaust valves in an engine cylinder comprising: providing a four-way hydraulic actuator attached to a first exhaust valve; providing a three-way hydraulic actuator attached to a second exhaust valve; providing a source of pressurized oil to said four-way hydraulic actuator and to said three-way hydraulic actuator; opening said four-way hydraulic actuator; then opening said three-way hydraulic actuator when the pressure in said engine cylinder has been substantially lowered.
Claim 3
Dependent Claim
47 words
The method of operating at least two exhaust valves in an engine cylinder of claim 1, further comprising: providing a three-way hydraulic actuator for each additional exhaust valve; and opening all of said three-way hydraulic actuators when the pressure in said engine cylinder has been substantially lowered.
Claim 4
Dependent Claim
34 words
The method of operating at least two, exhaust valves in an engine cylinder of claim 1, wherein said source of pressurized oil is common to said four-way hydraulic actuator and said three-way hydraulic actuator.
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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) | 1998-09-11 | 1999-03-13 | 1999-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-11 | 2003-03-13 | 2003-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-11 | 2007-03-13 | 2007-09-12 | $7700.00 | Window Closed / Lapsed |