US3631948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic inching control responsive to vehicle tilt
Assignee: Aisin Corp
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Filing: 1970-06-19
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Granted: 1972-01-04
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Expires: 1990-06-19
Abstract
Abstract A transmission control system for a vehicle having a transmission with fluid-actuated clutch means connected to a torque converter and a hydraulic brake means for arresting movement of the vehicle comprising, a source of pressurized fluid, a first fluid passageway means communicating said pressurized fluid to the clutch means, inching valve means disposed within said first passageway and responsive to operation of the brake means, manual means selectively to regulate the passage of pressurized fluid to the clutch means, a second passageway means interposed between said source of pressurized fluid and said manual means, and means interconnecting said inching valve means with the brake means. The transmission control system further includes normally closed valve means disposed within said second passageway means for interrupting pressurized fluid to flow into said manual means, and sensing means for controlling opening operation of said normally closed valve means responsive to inclination of the vehicle.
Inventors
- 👤 Kazuo Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:55
CPC Classifications
F; F16; F16H; F16H45/00; F16H47/00; F16H47/06; F16H2045/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
257 words
Control apparatus for a vehicle having a transmission with fluid-actuated clutch means connected to a torque converter and hydraulic brake means for arresting movement of the vehicle, comprising a source of pressure fluid including pressurizing means therefor, a first fluid conduit connecting said fluid source to the clutch means and including a return passageway to the fluid source, inching valve means interposed in said first conduit, said inching valve means including manual valve means for selectively controlling the passage of pressure fluid through said first conduit to activate aNd deactivate the clutch means, means interconnecting the brake means with said inching valve means so that operation of the brake means to arrest the vehicle moves the inching valve means to close said first conduit and prevent access of pressure fluid to said clutch means through the inching valve means, a second conduit connected between said fluid source and said manual valve means to bypass said inching valve means while leaving the manual valve means conditioned for applying fluid pressure to the clutch means when said inching valve means is closed, normally closed valve means disposed in said second conduit for interrupting flow of pressure fluid therethrough to the manual valve means, and sensing means responsive to inclination of the vehicle for controlling the opening of said normally closed valve means, whereby the inching means is rendered ineffective to control the clutch means when the normally closed valve means is opened but automatically reinstated to effectiveness when the normally closed valve means is returned to its closed condition.
Claim 2
Dependent Claim
257 words
Control apparatus for a vehicle having a transmission with fluid-actuated clutch means connected to a torque converter and hydraulic brake means for arresting movement of the vehicle, comprising a source of pressure fluid including pressurizing means therefor, a first fluid conduit connecting said fluid source to the clutch means and including a return passageway to the fluid source, inching valve means interposed in said first conduit, said inching valve means including manual valve means for selectively controlling the passage of pressure fluid through said first conduit to activate aNd deactivate the clutch means, means interconnecting the brake means with said inching valve means so that operation of the brake means to arrest the vehicle moves the inching valve means to close said first conduit and prevent access of pressure fluid to said clutch means through the inching valve means, a second conduit connected between said fluid source and said manual valve means to bypass said inching valve means while leaving the manual valve means conditioned for applying fluid pressure to the clutch means when said inching valve means is closed, normally closed valve means disposed in said second conduit for interrupting flow of pressure fluid therethrough to the manual valve means, and sensing means responsive to inclination of the vehicle for controlling the opening of said normally closed valve means, whereby the inching means is rendered ineffective to control the clutch means when the normally closed valve means is opened but automatically reinstated to effectiveness when the normally closed valve means is returned to its closed condition.
Claim 3
Dependent Claim
62 words
Control apparatus as set forth in claim 1, wherein said sensing means comprises a switch operative to close upon tilting of the vehicle, and an electrical circuit effective to open said normally closed valve means when said switch is closed, said normally closed valve means returning to closed condition when said switch is opened by return of the vehicle to level condition.
Claim 4
Dependent Claim
68 words
Control apparatus as set forth in claim 2, wherein said normally closed valve means comprises a valve having a spool normally closing said second conduit, and a solenoid connected to said spool effective when energized to move the spool to open said second conduit and effective when deenergized to return the spool to its normal closing position, said solenoid being connected to said switch in said electrical circuit.
Claim 5
Dependent Claim
15 words
control apparatus as set forth in claim 3, wherein said switch is a mercury switch.
Claim 6
Dependent Claim
114 words
Control apparatus as set forth in claim 1, wherein is provided a second clutch means, said first and second clutch means being arranged with associated gearing for respectively forwarding and reversing the vehicle, said manual valve means being effective to selectively control the passage of pressure fluid to said first and second clutch means to as to engage the selected clutch means when fluid pressure is supplied thereto and disengage the same when fluid pressure is removed therefrom, and said sensing means being operative only in response to inclination of the vehicle to permit flow of pressure fluid through said second conduit to said first and second clutch means through said manual valve means.
Claim 7
Dependent Claim
88 words
Control apparatus as set forth in claim 5, wherein said inching valve means has a first position for reducing the pressure of fluid in said first conduit and a second position for closing said first conduit, said means interconnecting said inching valve means with the brake means being arranged to prevent the brake means from stopping the vehicle when said inching valve means is in its first position but rendering the brake means effective to stop the vehicle when said inching valve means is in its second position.
Claim 8
Dependent Claim
36 words
Control apparatus as set forth in claim 6, wherein there is further provided a regulative valve means connected to said first conduit for adjusting and keeping the pressure of fluid passing therethrough at a predetermined value.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |