US3785224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrohydraulic transmission shifting apparatus for a motor car
Assignee: Robert Bosch GmbH
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Filing: 1972-09-13
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Granted: 1974-01-15
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Expires: 1992-09-13
Abstract
Abstract An electrohydraulic transmission shifting apparatus includes an electrohydraulic transducer with a throttle valve operated by an electromagnet and a pressure-limiting valve which effects a kickdown signal at a predetermined maximum pressure when the gas pedal is fully depressed. Fluid under pressure is supplied from a pump to the valves. A fluid-pressure control flow, limited by the pressure-limiting valve, is supplied to a main valve connecting a pump with the shifting means of a transmission so that the valve operates in accordance with the control flow. The pump is also connected with the kick-down shifting means of the transmission by a kick-down valve when the electrohydraulic transducer is operated upon a kick-down gas pedal operation.
Inventors
- 👤 G Will
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:06
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/02; F16H61/0262; F16H61/0265; F16H61/0267; F16H61/0202; F16H61/0251; F16H2061/026; F16H59/00; F16H59/14; F16H59/18; F16H59/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
229 words
Electrohydraulic transmission shifting apparatus for a motor car, comprising an automatic gear shift transmission having hydraulic shifting means including kickdown shifting means for shifting said transmission one speed down; a pump; a main valve connected between said pump and said shifting means and being reponsive to a fluid pressure control flow to produce a higher shifting pressure; an electrohydraulic control apparatus including an electrohydraulic transducer and pressure limiting means, said control apparatus having inlet means connected with said pump and supplying pressure fluid from said pump to said pressure limiting means and to said electrohydraulic transducer, first outlet means connected with said main valve for supplying thereto a fluid pressure control flow limited by said pressure limiting means to a maximum control pressure, and second outlet means connected with said kickdown shifting means; and electric control means reponsive to a kickdown pedal operation to energize and operate said electrohydraulic transducer to move to a position increasing the pressure of said fluid pressure control flow until the pressure is limited to a maximum pressure by said pressure limiting means, said maximum pressure control flow operating said electrohydraulic transducer to permit flow of pressure fluid from said inlet means through said second outlet means to said kick-down shifting means as a kickdown signal for actuating said kickdown shifting means to downshift the transmission at a speed above the normal downshift speed.
Claim 2
Dependent Claim
229 words
Electrohydraulic transmission shifting apparatus for a motor car, comprising an automatic gear shift transmission having hydraulic shifting means including kickdown shifting means for shifting said transmission one speed down; a pump; a main valve connected between said pump and said shifting means and being reponsive to a fluid pressure control flow to produce a higher shifting pressure; an electrohydraulic control apparatus including an electrohydraulic transducer and pressure limiting means, said control apparatus having inlet means connected with said pump and supplying pressure fluid from said pump to said pressure limiting means and to said electrohydraulic transducer, first outlet means connected with said main valve for supplying thereto a fluid pressure control flow limited by said pressure limiting means to a maximum control pressure, and second outlet means connected with said kickdown shifting means; and electric control means reponsive to a kickdown pedal operation to energize and operate said electrohydraulic transducer to move to a position increasing the pressure of said fluid pressure control flow until the pressure is limited to a maximum pressure by said pressure limiting means, said maximum pressure control flow operating said electrohydraulic transducer to permit flow of pressure fluid from said inlet means through said second outlet means to said kick-down shifting means as a kickdown signal for actuating said kickdown shifting means to downshift the transmission at a speed above the normal downshift speed.
Claim 3
Dependent Claim
39 words
Apparatus as claimed in claim 1, wherein said electric control means include electronic control means responsive to the speed of said transmission and to the position of the gas pedal to generate an output signal controlling said electrohydraulic transducer.
Claim 4
Dependent Claim
27 words
Apparatus as claimed in claim 1, wherein said electrohydraulic transducer includes an electromagnet, and a throttle valve having hydraulic feed back and being operated by said electromagnet.
Claim 5
Dependent Claim
38 words
Apparatus as claimed in claim 1, wherein said pressure limiting means includes a pressure limiting valve connecting said inlet means with said electrohydraulic transducer; and wherein said electrohydraulic transducer connects said inlet means with said second outlet means.
Claim 6
Dependent Claim
38 words
Apparatus as claimed in claim 1, wherein said pressure limiting means includes a pressure limiting valve connected with said first and second outlet means; and wherein said electrohydraulic transducer connects said pressure limiting valve with said inlet means.
Claim 7
Dependent Claim
32 words
Apparatus as claimed in claim 5, wherein said inlet means is connected by said pressure limiting valve with said second outlet means for supplying said kickdown signal to said kickdown shifting means.
Claim 8
Dependent Claim
69 words
Apparatus as claimed in claim 1, wherein said pressure limiting means includes a pressure limiting valve connected with said first outlet means; comprising a kickdown valve connecting said inlet means with said second outlet means, and communicating with said pressure limiting valve and said first outlet means; and wherein said electrohydraulic transducer communicates with said pressure limiting valve and said kickdown valve and is connected with said inlet means.
Claim 9
Dependent Claim
62 words
Apparatus as claimed in claim 1, wherein said electrohydraulic transducer includes a throttle valve portion for connecting said inlet means with said first outlet means, a kickdown valve portion for connecting said inlet means with said second outlet means, and electromagnetic means controlled and actuated by said electric control means to simultaneously operate said throttle valve portion and said kickdown valve portion.
Claim 10
Dependent Claim
145 words
Apparatus as claimed in claim 8, wherein said throttle valve portion and said kickdown valve portion of said electrohydraulic transducer are parts of a valve slide piston operated by said electromagnetic means, said throttle valve portion having a first control edge for regulating the flow from said Inlet means to said first outlet means, and said kickdown valve portion having a second control edge for regulating the flow from said inlet means to said second outlet means; said valve slide piston having one end connected with said electromagnetic means and an other end forming an end chamber connected with said fluid pressure control flow so that said valve slide piston is moved in one direction when said electromagnetic means is energized, and is moved in the opposite direction when the pressure of said control flow increases to a maximum determined by said pressure limiting means.
Claim 11
Dependent Claim
35 words
Apparatus as claimed in claim 9, comprising a resilient stop at said other end of said valve slide piston in said end chamber for limiting movement of said valve slide piston by said electromagnetic means.
Claim 12
Dependent Claim
64 words
Apparatus as claimed in claim 1, wherein said pressure limiting valve includes a valve slide piston having a first control edge for controlling the fluid pressure control flow between said inlet means and said first outlet means to said main valve, and a second control edge for controlling the flow between said inlet means and second outlet means and to said kickdown shifting means.
Claim 13
Dependent Claim
93 words
Apparatus as claimed in claim 1, comprising a kickdown valve having a valve slide piston having a control edge for controlling the flow between said inlet means and said second outlet means, and thereby said kickdown signal, said valve slide piston having ends forming first and second end chambers, said first chamber being connected with said inlet means through said electrohydraulic transducer, and said second chamber being connected with said first outlet means and having the limited pressure of said fluid pressure control flow, and comprising a spring in said second end chamber.
Claim 14
Dependent Claim
50 words
Apparatus as claimed in claim 1, including a third outlet means connected with said hydraulic shifting means, and being connected by said electrohydraulic apparatus with said inlet means for operating said hydraulic shifting means, while said main valve receives said fluid pressure control flow limited by said pressure limiting means.
Claim 15
Dependent Claim
78 words
Apparatus as claimed in claim 1, wherein said electrohydraulic transducer includes an electromagnet controlled by said electric control means and a valve slide piston having a throttling portion with a control edge controlling the pressure fluid control flow between said inlet means and said first outlet means through said pressure limiting means, and a kickdown portion with an other control edge controlling the flow from said inlet means to said second outlet means and thereby said kickdown signal.
References Cited (Backward Citations)
US3487725A
Cited
US3727487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |