US3703110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control system for an automatic transmission
Assignee: Toyota Motor Corp
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Filing: 1971-01-26
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Granted: 1972-11-21
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Expires: 1991-01-26
Abstract
Abstract A hydraulic control system contains a hydraulic pressure source for producing hydraulic pressure supplied into the hydraulic servo mechanisms of a hydraulic automatic transmission, the hydraulic pressure is conveyed through a conduit system to a manual distributing valve which distributes the hydraulic pressure in accordance with its position in the various ranges ''''P'''', ''''R'''', ''''N'''', ''''D'''' and ''''L'''', a pressure regulator valve is located in the conduit system for establishing a line pressure by regulating the hydraulic pressure from the hydraulic pressure source, a governor valve in communication with a change-over valve and with a shift valve provides a governor pressure conforming to the vehicle speed, and a throttle valve is located in the conduit system for obtaining a throttle pressure conforming to the engine throttle opening. The shift valve supplies the line pressure to the required servo mechanism by comparing the governor pressure and the throttle pressure, and the change-over valve supplies the throttle pressure to the pressure regulator valve in accordance with the governor pressure. When the manual distributing valve is in the ''''R'''' range and the engine throttle opening is extremely small, the line pressure from the manual distributing valve is discharged and controlled in the throttle valve to take out a relatively low throttle pressure. When the throttle opening exceeds a predetermined value, the throttle valve takes out the line pressure from the pressure regulator valve as it is, thus obtaining a constant high throttle pressure. When the manual distributing valve is in the ''''D'''' range, the throttle pressure is applied to the pressure regulator valve through the changeover valve. When the throttle pressure is low, the line pressure of the pressure regulator valve is reduced, and when the throttle pressure is high, the line pressure thereof is increased. Furthermore, as the governor pressure is supplied to the changeover valve, the throttle pressure applied to the pressure regulator valve at a vehicle speed below a predetermined value, is shut off by means of the changeover valve, thus obtaining a constant low line pressure. Moreover, when the manual distributing valve is shifted from the ''''D'''' to the ''''L'''' range, this valve communicates the line pressure with the pressure regulator valve and, therefore, a high line pressure is produced by the pressure regulator valve, having no relationship with the vehicle speed and the engine throttle opening.
Inventors
- 👤 Sumio Uozumi
- 👤 Ichio Sakai
- 👤 Kiyoshi Ohnuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:16
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/0021; F16H61/0025; F16H47/00; F16H47/06; F16H47/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
217 words
In a hydraulic automatic transmission connected to an engine and provided with fluid coupling means and a gear unit including hydraulic servo mechanisms, a hydraulic control system for the hydraulic automatic transmission comprising a conduit system for circulating pressurized hydraulic fluid, a hydraulic pressure source for producing hydraulic pressure being supplied through said conduit system into said hydraulic servo mechanisms, a manual distributing valve displaceable within a number of ranges and positioned within said conduit system for distributing the hydraulic pressure from said hydraulic pressure source to the required said servo mechanism, and a valve positioned within said conduit system for introducing the hydraulic pressuRe from said hydraulic pressure source and developing a suitable hydraulic control pressure, said valve having at least two discharge ports from separate spaced locations therein for accomplishing hydraulic pressure control, one of said discharge ports being disposed with respect to said manual distributing valve for permitting discharge when said manual valve is in a certain range, but for eliminating discharge when said manual valve is in another range, thus providing two different control operations for said valve depending on the position of said manual distributing valve and permitting a change in the output hydraulic pressure by changing the actuating point of said valve when said manual distributing valve is in another range.
Claim 2
Dependent Claim
217 words
In a hydraulic automatic transmission connected to an engine and provided with fluid coupling means and a gear unit including hydraulic servo mechanisms, a hydraulic control system for the hydraulic automatic transmission comprising a conduit system for circulating pressurized hydraulic fluid, a hydraulic pressure source for producing hydraulic pressure being supplied through said conduit system into said hydraulic servo mechanisms, a manual distributing valve displaceable within a number of ranges and positioned within said conduit system for distributing the hydraulic pressure from said hydraulic pressure source to the required said servo mechanism, and a valve positioned within said conduit system for introducing the hydraulic pressuRe from said hydraulic pressure source and developing a suitable hydraulic control pressure, said valve having at least two discharge ports from separate spaced locations therein for accomplishing hydraulic pressure control, one of said discharge ports being disposed with respect to said manual distributing valve for permitting discharge when said manual valve is in a certain range, but for eliminating discharge when said manual valve is in another range, thus providing two different control operations for said valve depending on the position of said manual distributing valve and permitting a change in the output hydraulic pressure by changing the actuating point of said valve when said manual distributing valve is in another range.
Claim 3
Dependent Claim
217 words
In a hydraulic automatic transmission connected to an engine and provided with fluid coupling means and a gear unit including hydraulic servo mechanisms, a hydraulic control system for the hydraulic automatic transmission comprising a conduit system for circulating pressurized hydraulic fluid, a hydraulic pressure source for producing hydraulic pressure being supplied through said conduit system into said hydraulic servo mechanisms, a manual distributing valve displaceable within a number of ranges and positioned within said conduit system for distributing the hydraulic pressure from said hydraulic pressure source to the required said servo mechanism, and a valve positioned within said conduit system for introducing the hydraulic pressuRe from said hydraulic pressure source and developing a suitable hydraulic control pressure, said valve having at least two discharge ports from separate spaced locations therein for accomplishing hydraulic pressure control, one of said discharge ports being disposed with respect to said manual distributing valve for permitting discharge when said manual valve is in a certain range, but for eliminating discharge when said manual valve is in another range, thus providing two different control operations for said valve depending on the position of said manual distributing valve and permitting a change in the output hydraulic pressure by changing the actuating point of said valve when said manual distributing valve is in another range.
Claim 4
Dependent Claim
217 words
In a hydraulic automatic transmission connected to an engine and provided with fluid coupling means and a gear unit including hydraulic servo mechanisms, a hydraulic control system for the hydraulic automatic transmission comprising a conduit system for circulating pressurized hydraulic fluid, a hydraulic pressure source for producing hydraulic pressure being supplied through said conduit system into said hydraulic servo mechanisms, a manual distributing valve displaceable within a number of ranges and positioned within said conduit system for distributing the hydraulic pressure from said hydraulic pressure source to the required said servo mechanism, and a valve positioned within said conduit system for introducing the hydraulic pressuRe from said hydraulic pressure source and developing a suitable hydraulic control pressure, said valve having at least two discharge ports from separate spaced locations therein for accomplishing hydraulic pressure control, one of said discharge ports being disposed with respect to said manual distributing valve for permitting discharge when said manual valve is in a certain range, but for eliminating discharge when said manual valve is in another range, thus providing two different control operations for said valve depending on the position of said manual distributing valve and permitting a change in the output hydraulic pressure by changing the actuating point of said valve when said manual distributing valve is in another range.
Claim 5
Dependent Claim
401 words
In a hydraulic automatic transmission connected to an engine and provided with fluid coupling means and a gear unit including hydraulic servo mechanisms, a hydraulic control system for the hydraulic automatic transmission comprising a conduit system for circulating a pressurized hydraulic fluid and including a line pressure circuit, a hydraulic pressure source for producing hydraulic pressure being supplied through said conduit system into said hydraulic servo mechanisms, a manual distributing valve displaceable within a plurality of ranges and positioned in said conduit system and connected to said line pressure conduit for receiving the hydraulic pressure from said hydraulic pressure source and being arranged to distribute the hydraulic pressure through the required said servo mechanism, a throttle valve positioned in said conduit system and connected to said line pressure circuit for receiving the hydraulic pressure from said hydraulic pressure source and being arranged to develop a throttle pressure conforming to the engine throttle opening, a pressure regulator valve positioned in said conduit system and located upstream in said line pressure circuit from said throttle valve and distributing valve, said conduit system including a conduit section connecting said pressure regulator valve and said throttle valve for controlling the hydraulic pressure to be supplied from said hydraulic pressure source into said servo mechanisms at a predetermined value by means of the output hydraulic pressure of said throttle valve, said throttle valve having a plurality of serially arranged hydraulic fluid chambers therein with a discharge port from each of the opposite end fluid chambers, one of said discharge ports being arranged so as to effect discharge when said manual distributing valve is in a certain range and to be brought into communication with a part of said conduit system for introducing the hydraulic pressure from said hydraulic pressure source when said manual distributing valve is displaced into another range, thereby providing different control operations for said throttle valve depending on the position of said manual distributing valve, thus producing a hydraulic control pressure conforming to the throttle opening by means of said pressure regulator valve utilizIng the hydraulic control pressure of said throttle valve when said manual distributing valve is in the certain range, and producing a relatively low hydraulic control pressure when said manual distributing valve is in another range and the throttle opening is nearly fully closed, but a relatively high constant hydraulic control pressure when the throttle opening exceeds a predetermined value.
Claim 6
Dependent Claim
401 words
In a hydraulic automatic transmission connected to an engine and provided with fluid coupling means and a gear unit including hydraulic servo mechanisms, a hydraulic control system for the hydraulic automatic transmission comprising a conduit system for circulating a pressurized hydraulic fluid and including a line pressure circuit, a hydraulic pressure source for producing hydraulic pressure being supplied through said conduit system into said hydraulic servo mechanisms, a manual distributing valve displaceable within a plurality of ranges and positioned in said conduit system and connected to said line pressure conduit for receiving the hydraulic pressure from said hydraulic pressure source and being arranged to distribute the hydraulic pressure through the required said servo mechanism, a throttle valve positioned in said conduit system and connected to said line pressure circuit for receiving the hydraulic pressure from said hydraulic pressure source and being arranged to develop a throttle pressure conforming to the engine throttle opening, a pressure regulator valve positioned in said conduit system and located upstream in said line pressure circuit from said throttle valve and distributing valve, said conduit system including a conduit section connecting said pressure regulator valve and said throttle valve for controlling the hydraulic pressure to be supplied from said hydraulic pressure source into said servo mechanisms at a predetermined value by means of the output hydraulic pressure of said throttle valve, said throttle valve having a plurality of serially arranged hydraulic fluid chambers therein with a discharge port from each of the opposite end fluid chambers, one of said discharge ports being arranged so as to effect discharge when said manual distributing valve is in a certain range and to be brought into communication with a part of said conduit system for introducing the hydraulic pressure from said hydraulic pressure source when said manual distributing valve is displaced into another range, thereby providing different control operations for said throttle valve depending on the position of said manual distributing valve, thus producing a hydraulic control pressure conforming to the throttle opening by means of said pressure regulator valve utilizIng the hydraulic control pressure of said throttle valve when said manual distributing valve is in the certain range, and producing a relatively low hydraulic control pressure when said manual distributing valve is in another range and the throttle opening is nearly fully closed, but a relatively high constant hydraulic control pressure when the throttle opening exceeds a predetermined value.
Claim 7
Dependent Claim
35 words
In a hydraulic automatic transmission, as set forth in claim 2, characterized in that said throttle valve contains five serially arranged oil chambers therein, and one of said oil chambers having a discharge port therefrom.
Claim 8
Dependent Claim
71 words
In a hydraulic automatic transmission, as set forth in claim 2, characterized in that said throttle valve comprises a valve housing, a valve plug disposed within one end of said housing, a valve shaft movably displaceable within said valve housing and arranged in alignment with said valve plug, and a pair of springs disposed within said housing and each saId spring being biased against an opposite end of said valve shaft.
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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |