US4226142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic transmission utilizing a slider for pressure distribution to servo-elements controlling the gear ratio
Assignee: Robert Bosch GmbH
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Filing: 1978-08-01
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Granted: 1980-10-07
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Expires: 1998-08-01
Abstract
Abstract In a hydraulic transmission in which couplings and brake bands (servo-elements) control the gear ratio and are themselves engaged and disengaged in accordance with pressure applied thereto, a motor-driven slider is provided to connect a main pressure source directly to servo-elements which will remain engaged in the newly selected gear ratio. Solenoid operated valves are interposed between the main pressure source and a second intake port of the slider. Milled channels in the slider connect this second intake port to the servo-elements to be newly engaged during the gear shift. A known gear control unit operates the valves to control the rate of change of pressure increase at the second intake port to a selected value which will limit the jolt of the vehicle to a predetermined maximum jolt.
Inventors
- 👤 Helmut Rembold
- 👤 Ernst Linder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:02
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F16H61/0276; F16H61/0202; F16H61/0204; F16H61/0206; F16H61/0251; F16H2061/0281
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
219 words
In a transmission having gears operable in a plurality of gear ratios, a control unit (50) for furnishing gear shift control signals signifying a desired shift from a then-present gear ratio to a newly selected gear ratio, a plurality of servo-elements (16, etc.) for controlling the engagement and disengagement of said gears in accordance with pressure applied thereto, said plurality of servo-elements including at least one servo-element to be activated during said desired shift, and a pressure source (40) furnishing a pressure medium at a main pressure: a gear shift system comprising distributor means (41) having a first and second pressure medium intake (410, 411), a plurality of pressure medium outlets (412-416) each connected to a corresponding one of said servo-elements, and movable slider means adapted to connect the pressure medium outlet connected to said at least one servo-element to said second pressure medium intake during said desired shift; moving means (49) for moving said movable slider means under control of said gear shift control signals; connecting means for connecting said first pressure medium intake directly to said pressure source; and valve means (42, 52) interconnected between said pressure source and said second pressure medium intake for regulating transmission of pressure from said pressure source to said second pressure medium intake under control of said gear shift control signals.
Claim 2
Dependent Claim
219 words
In a transmission having gears operable in a plurality of gear ratios, a control unit (50) for furnishing gear shift control signals signifying a desired shift from a then-present gear ratio to a newly selected gear ratio, a plurality of servo-elements (16, etc.) for controlling the engagement and disengagement of said gears in accordance with pressure applied thereto, said plurality of servo-elements including at least one servo-element to be activated during said desired shift, and a pressure source (40) furnishing a pressure medium at a main pressure: a gear shift system comprising distributor means (41) having a first and second pressure medium intake (410, 411), a plurality of pressure medium outlets (412-416) each connected to a corresponding one of said servo-elements, and movable slider means adapted to connect the pressure medium outlet connected to said at least one servo-element to said second pressure medium intake during said desired shift; moving means (49) for moving said movable slider means under control of said gear shift control signals; connecting means for connecting said first pressure medium intake directly to said pressure source; and valve means (42, 52) interconnected between said pressure source and said second pressure medium intake for regulating transmission of pressure from said pressure source to said second pressure medium intake under control of said gear shift control signals.
Claim 3
Dependent Claim
53 words
A transmission as set forth in claim 1, wherein said plurality of servo-elements includes a further servo-element (17) to be deactivated during said desired shift; further comprising a discharge line connected to said further servo-element, and throttling means (47) positioned in said discharge line for throttling the flow of said pressure medium therethrough.
Claim 4
Dependent Claim
34 words
A transmission as set forth in claim 1, wherein said control unit is an electronic control unit; and wherein said moving means is a servo-motor operative under control of said gear shift control signals.
Claim 5
Dependent Claim
15 words
A transmission as set forth in claim 3, wherein said servo-motor is a step motor.
Claim 6
Dependent Claim
70 words
A transmission as set forth in claim 3, wherein said movable slider means comprises a rotary slider; wherein said servo-motor has an outlet shaft coupled to said rotary slider; further comprising angle sensor means coupled to said rotary slider and connected to said electronic control unit for furnishing an angle signal indicative of the angular position of said rotary slider relative to a reference position to said electronic control unit.
Claim 7
Dependent Claim
17 words
A transmission as set forth in claim 1, wherein said valve means comprises a 3/2 solenoid valve.
Claim 8
Dependent Claim
40 words
A transmission as set forth in claim 1, wherein said valve means comprises a first 2/2 solenoid valve (52); further comprising a reservoir (48), and a second 2/2 solenoid valve for connecting said second pressure medium intake to said reservoir.
References Cited (Backward Citations)
US3958466A
Cited
US3949627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |