Patent US3688607A successfully refreshed from Google Patents.
US3688607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission and control
Assignee: Motors Liquidation Co
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Filing: 1971-05-26
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Granted: 1972-09-05
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Expires: 1991-05-26
Abstract
Abstract A control for a multi-ratio transmission including a plurality of shift valves each having a differential area portion responsive to engagement pressure to control the engagement of a clutch or brake and a control chamber responsive to a variable control pressure. The pressure in the control chamber is established by a variable force solenoid to cause the shift valve to upshift or downshift and to provide a bias pressure for the regulating function of the shift valve. The control also includes relay valves situated between the pressure source and the shift valves to prevent excessive overlap of the drive establishing devices in the transmission.
Inventors
- 👤 Jerry R Marlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:31
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0206; F16H61/0262; F16H61/0276; F16H2061/0288; F16H61/12; F16H2061/1204
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
268 words
A control for a multi-ratio power transmission having friction devices for establishing two drive ratios, said control comprising a fluid pressure source; a pair of shift valve means each having a spool valve with a differential area portion, bias means and a control chamber adjacent said spool valve, each of said spool valves being movable to a downshift position and an upshift position; a pair of relay valve means; first passage means for providing fluid communication between said relay valve means and said source; second passage means for providing individual fluid communication between said relay valve means and said spool valves; third passage means for providing fluid communication between said control chambers and said source; fourth fluid passage means for providing fluid communication between one of said spool valve and one of said friction devices; fifth passage means for providing fluid communication between said other spool valve and the other friction device; and variable force solenoid means for controlling the pressure individually in each of said control chambers; said solenoid means being operable to provide an increase in pressure in one of said control chambers to move said one spool valve from said downshift position toward said upshift position to establish fluid communication between said first passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said control chamber to regulate the pressure in said fourth passage means, one of said relay valve means being operable to prevent fluid communication between said source and said other spool valve when said one spool valve is upshifted.
Claim 2
Dependent Claim
268 words
A control for a multi-ratio power transmission having friction devices for establishing two drive ratios, said control comprising a fluid pressure source; a pair of shift valve means each having a spool valve with a differential area portion, bias means and a control chamber adjacent said spool valve, each of said spool valves being movable to a downshift position and an upshift position; a pair of relay valve means; first passage means for providing fluid communication between said relay valve means and said source; second passage means for providing individual fluid communication between said relay valve means and said spool valves; third passage means for providing fluid communication between said control chambers and said source; fourth fluid passage means for providing fluid communication between one of said spool valve and one of said friction devices; fifth passage means for providing fluid communication between said other spool valve and the other friction device; and variable force solenoid means for controlling the pressure individually in each of said control chambers; said solenoid means being operable to provide an increase in pressure in one of said control chambers to move said one spool valve from said downshift position toward said upshift position to establish fluid communication between said first passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said control chamber to regulate the pressure in said fourth passage means, one of said relay valve means being operable to prevent fluid communication between said source and said other spool valve when said one spool valve is upshifted.
Claim 3
Dependent Claim
340 words
A control for a multi-ratio power transmission having friction devices for establishing two drive ratios, said control comprising a fluid pressure source; first and second shift valve means each having a spool valve with a differential area portion, bias means and a shift control chamber adjacent said spool valve, each of said spool valves being movable to a disengagement position and an engagement position; first and second relay valve means each having control chamber means; first passage means for provIding fluid communication between said relay valve means and said source; second passage means for providing individual fluid communication between said first relay valve means and said first spool valves and between said second relay valve means and said second spool valve; third passage means for providing fluid communication between said control chambers and said source; fourth fluid passage means for providing fluid communication between said first spool valve and one of said friction devices and being connected with the control chamber of said second relay valve means; fifth passage means for providing fluid communication between said second spool valve and the other friction device and being connected with the control chamber of said first relay valve means; and variable force solenoid means for controlling the pressure individually in each of said shift control chambers; said solenoid means being operable to provide an increase in pressure in the first shift valve means shift control chamber to move said first spool valve from said disengagement position toward said engagement position to establish fluid communication between said first passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said shift control chamber to regulate the pressure in said fourth passage means and supplying pressure to the control chamber of said second relay valve means, said second relay valve means being movable by the pressure in the control chamber to prevent fluid communication between said source and said second spool valve when said first spool valve is in said engagement position.
Claim 4
Dependent Claim
340 words
A control for a multi-ratio power transmission having friction devices for establishing two drive ratios, said control comprising a fluid pressure source; first and second shift valve means each having a spool valve with a differential area portion, bias means and a shift control chamber adjacent said spool valve, each of said spool valves being movable to a disengagement position and an engagement position; first and second relay valve means each having control chamber means; first passage means for provIding fluid communication between said relay valve means and said source; second passage means for providing individual fluid communication between said first relay valve means and said first spool valves and between said second relay valve means and said second spool valve; third passage means for providing fluid communication between said control chambers and said source; fourth fluid passage means for providing fluid communication between said first spool valve and one of said friction devices and being connected with the control chamber of said second relay valve means; fifth passage means for providing fluid communication between said second spool valve and the other friction device and being connected with the control chamber of said first relay valve means; and variable force solenoid means for controlling the pressure individually in each of said shift control chambers; said solenoid means being operable to provide an increase in pressure in the first shift valve means shift control chamber to move said first spool valve from said disengagement position toward said engagement position to establish fluid communication between said first passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said shift control chamber to regulate the pressure in said fourth passage means and supplying pressure to the control chamber of said second relay valve means, said second relay valve means being movable by the pressure in the control chamber to prevent fluid communication between said source and said second spool valve when said first spool valve is in said engagement position.
Claim 5
Dependent Claim
466 words
A control for a multi-ratio power transmission having friction devices for establishing two drive ratios, said control comprising a fluid pressure source; first and second shift valve means each having a spool valve with a differential area portion, bias means and a shift control chamber adjacent said spool valve, each of said spool valves being movable to a disengagement position and an engagement position; first and second relay valve means each having control chamber means; first passage means for providing fluid communication between said relay valve means and said source; second passage means for providing individual fluid communication between said first relay valve means and said first spool valves and between said second relay valve means and said second spool valve; third passage means for providing fluid communication between said control chambers and said source; fourth fluid passage means for providing fluid communication between said first spool valve and one of said friction devices and being connected with the control chamber of said second relay valve means; fifth passage means for providing fluid communication between said second spool valve and the other friction device and being connected with the control chamber of said first relay valve means; and variable force solenoid means for controlling the pressure individually in each of said shift control chambers; said solenoid means being operable to provide an increase in pressure in the first shift valve means shift control chamber to move said first spool valve from said disengagement position toward said engagement position to establish fluid communication between said first passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said shift control chamber to regulate the pressure in said fourth passage means and supplying pressure to the control chamber of said second relay valve means, said second relay valve means being movable by the pressure in the control chamber to prevent fluid communication between said source and said second spool valve when said first spool valve is in said engagement position; said solenoid means being operable to provide an increase in pressure in the second shift valve means shift control chamber to move said Second spool valve from said disengagement position toward said engagement position to establish fluid communication between said second passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said shift control chamber to regulate the pressure in said fourth passage means and supplying pressure to the control chamber of said first relay valve means, said first relay valve means being movable by the pressure in the control chamber to prevent fluid communication between said source and said first spool valve when said second spool valve is in said engagement position.
Claim 6
Dependent Claim
466 words
A control for a multi-ratio power transmission having friction devices for establishing two drive ratios, said control comprising a fluid pressure source; first and second shift valve means each having a spool valve with a differential area portion, bias means and a shift control chamber adjacent said spool valve, each of said spool valves being movable to a disengagement position and an engagement position; first and second relay valve means each having control chamber means; first passage means for providing fluid communication between said relay valve means and said source; second passage means for providing individual fluid communication between said first relay valve means and said first spool valves and between said second relay valve means and said second spool valve; third passage means for providing fluid communication between said control chambers and said source; fourth fluid passage means for providing fluid communication between said first spool valve and one of said friction devices and being connected with the control chamber of said second relay valve means; fifth passage means for providing fluid communication between said second spool valve and the other friction device and being connected with the control chamber of said first relay valve means; and variable force solenoid means for controlling the pressure individually in each of said shift control chambers; said solenoid means being operable to provide an increase in pressure in the first shift valve means shift control chamber to move said first spool valve from said disengagement position toward said engagement position to establish fluid communication between said first passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said shift control chamber to regulate the pressure in said fourth passage means and supplying pressure to the control chamber of said second relay valve means, said second relay valve means being movable by the pressure in the control chamber to prevent fluid communication between said source and said second spool valve when said first spool valve is in said engagement position; said solenoid means being operable to provide an increase in pressure in the second shift valve means shift control chamber to move said Second spool valve from said disengagement position toward said engagement position to establish fluid communication between said second passage means, said fourth passage means and said differential area portion; said differential area portion and said biasing means opposing the pressure in said shift control chamber to regulate the pressure in said fourth passage means and supplying pressure to the control chamber of said first relay valve means, said first relay valve means being movable by the pressure in the control chamber to prevent fluid communication between said source and said first spool valve when said second spool valve is in said engagement position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |