US4928544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual pressure pressurized fluid actuated shifting mechanism
Assignee: Eaton Corp
•
Filing: 1989-06-19
•
Granted: 1990-05-29
•
Expires: 2009-06-19
Abstract
Abstract A control (220) for providing a dual pressure source (236) of pressurized fluid to a pressurized fluid operated shift actuator (30) for a mechanical change gear transmission (202) is provided.
Inventors
- 👤 Ronald K. Markyvech
- 👤 Thomas A. Genise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:00
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/26; F16H61/28; F16H61/2807; F16H61/30; F16H2061/2823; F16H2061/307; F16H2061/308; F16H61/68; F16H61/682; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/20024
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
136 words
A control system for controlling pressurized fluid operated shift actuators (30) for mechanical transmissions, said actuators including a first (88) and a second (86) pressurizable chamber, pressurization of said first chamber effective to urge said actuator into a first position for causing engagement of a selected ratio of said transmission and pressurization of said second chamber effective to urge said actuator into a second position for causing disengagement of said selected ratio, and shift control means for selectively pressurizing and venting selected ones of said first and second chambers by selectively connecting same to a controlled source (236) of pressurized fluid and to an exhaust (54), said system characterized by: means (220) for causing said controlled source to be pressurized to a selected one of a first pressure level or a second relatively lesser pressure level.
Claim 2
Dependent Claim
136 words
A control system for controlling pressurized fluid operated shift actuators (30) for mechanical transmissions, said actuators including a first (88) and a second (86) pressurizable chamber, pressurization of said first chamber effective to urge said actuator into a first position for causing engagement of a selected ratio of said transmission and pressurization of said second chamber effective to urge said actuator into a second position for causing disengagement of said selected ratio, and shift control means for selectively pressurizing and venting selected ones of said first and second chambers by selectively connecting same to a controlled source (236) of pressurized fluid and to an exhaust (54), said system characterized by: means (220) for causing said controlled source to be pressurized to a selected one of a first pressure level or a second relatively lesser pressure level.
Claim 3
Dependent Claim
22 words
The control system of claim 1 wherein said first pressure level is at least twice as great as said second pressure level.
Claim 4
Dependent Claim
23 words
The control system of claim 1 wherein said first pressure level is at least four times as great as said second pressure level.
Claim 5
Dependent Claim
45 words
The control system of claims 1, 2 or 3 wherein said first chamber is pressurized to said first pressure level to cause engagement of said selected ratio and said second chamber is pressurized to said second pressure level to cause disengagement of said selected ratio.
Claim 6
Dependent Claim
60 words
The control system of claim 1, 2 or 3 wherein said first chamber is maintained pressurized to retain said first ratio engaged, said first chamber pressurized to said first pressure level at initiation of engagement of said selected ratio and, after a predetermined time, maintained pressurized at said second pressure level, said second chamber pressurized to said second pressure level.
Claim 7
Dependent Claim
16 words
The control system of claim 1, 2 or 3 wherein said pressurized fluid is a gas.
Claim 8
Dependent Claim
13 words
The control system of claim 4 wherein said pressurized fluid is a gas.
Claim 9
Dependent Claim
13 words
The control system of claim 5 wherein said pressurized fluid is a gas.
Claim 10
Dependent Claim
132 words
A control method for controlling pressurized fluid operated shift actuators (30) for mechanical transmissions, said actuators including a first (88) and a second (86) pressurizable chamber, pressurization of said first chamber effective to urge said actuator into a first position for causing engagement of a selected ratio of said transmission and pressurization of said second chamber effective to urge said actuator into a second position for causing disengagement of said selected ratio, shift control means for selectively pressurizing and venting selected ones of said first and second chambers by selectively connecting same to a controlled source (236) of pressurized fluid and to an exhaust (54), said method characterized by: causing said controlled source to be pressurized to a selected one of a first pressure level or a second relatively lesser pressure level.
Claim 11
Dependent Claim
132 words
A control method for controlling pressurized fluid operated shift actuators (30) for mechanical transmissions, said actuators including a first (88) and a second (86) pressurizable chamber, pressurization of said first chamber effective to urge said actuator into a first position for causing engagement of a selected ratio of said transmission and pressurization of said second chamber effective to urge said actuator into a second position for causing disengagement of said selected ratio, shift control means for selectively pressurizing and venting selected ones of said first and second chambers by selectively connecting same to a controlled source (236) of pressurized fluid and to an exhaust (54), said method characterized by: causing said controlled source to be pressurized to a selected one of a first pressure level or a second relatively lesser pressure level.
Claim 12
Dependent Claim
22 words
The control method of claim 9 wherein said first pressure level is at least twice as great as said second pressure level.
Claim 13
Dependent Claim
23 words
The control system of claim 9 wherein said first pressure level is at least four times as great as said second pressure level.
Claim 14
Dependent Claim
73 words
The control system of claims 9, 10 or 11 wherein said first chamber is maintained pressurized to retain said first ratio engaged, said controlled source is pressurized to said first pressure level at initiation of engagement of said selected ratio and, after a predetermined time, said controlled source is maintained at said second pressure level, said controlled source is pressurized to said second pressure level when said selected ratio is to be disengaged.
Claim 15
Dependent Claim
16 words
The control method of claims 9, 10 and 11 wherein said pressurized fluid is a gas.
Claim 16
Dependent Claim
13 words
The control method of claim 12 wherein said pressurized fluid is a gas.
References Cited (Backward Citations)
US2137953A
Cited
US2568228A
Cited
US2931237A
Cited
US3158070A
Cited
US3793898A
Cited
US4648290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |