Patent JPS4911136A successfully refreshed from Google Patents.
US4262784A
Expired / Lapsed
US
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Device with a jack for controlling a gear box synchromesh, and method for using same
Assignee: Individual
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Filing: 1974-06-14
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Granted: 1981-04-21
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Expires: 1994-06-14
Abstract
Abstract A method and device for controlling the fork of a synchromesh for a gear box. A command signal sent by the operator is converted into signals by a modulator whose output controls an electric valve to open and close several times in succession. The electric valve controls a jack which in turn controls the fork connected to a sliding gear associated with the synchromesh, whereby the instantaneous pressure of the fluid supplied to the jack is varied during the steps of approach, synchronization, and locking of the synchromesh.
Inventors
- 👤 Jean-Paul Sibeud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:33
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/04; F16H61/0403; F16H61/26; F16H61/28; F16H2061/2823; F16H3/00; F16H3/02; F16H3/08; F16H3/12; F16H61/30; F16H63/00; F16H63/02; F16H63/30; F16H63/3023
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A method for controlling a gear box synchromesh, comprising the steps of: operating a fork, which controls a gear box synchromesh, by means of a pneumatic jack supplied with compressed air, the instantaneous pressure of which is varied during the steps of approach, synchronization proper, and locking of the synchromesh; modulating the air pressure by means of a three-way valve interposed between the jack and a source of constant pressure compressed air; and supplying the jack with compressed air according to a pressure law which includes three successive maxima and two successive minima, to wit, a first maximum during the approach step, a first minimum shortly after the beginning of the synchronization step, a second maximum during the synchronization step proper, a second minimum at the end of the synchronization step and the beginning of the locking step, and a third maximum at the end of the locking step.
Claim 2
Independent Claim
149 words
A method for controlling a gear box synchromesh, comprising the steps of: operating a fork, which controls a gear box synchromesh, by means of a pneumatic jack supplied with compressed air, the instantaneous pressure of which is varied during the steps of approach, synchronization proper, and locking of the synchromesh; modulating the air pressure by means of a three-way valve interposed between the jack and a source of constant pressure compressed air; and supplying the jack with compressed air according to a pressure law which includes three successive maxima and two successive minima, to wit, a first maximum during the approach step, a first minimum shortly after the beginning of the synchronization step, a second maximum during the synchronization step proper, a second minimum at the end of the synchronization step and the beginning of the locking step, and a third maximum at the end of the locking step.
Claim 3
Dependent Claim
30 words
A method according to claim 1, characterized in that the first maximum of pressure during the approach step is higher than the second maximum which occurs during the synchronization step.
Claim 4
Dependent Claim
22 words
A method according to claim 1, characterized in that the third maximum of pressure is higher than the first and second ones.
Claim 5
Dependent Claim
42 words
A method according to claim 1, characterized in that, after the end of the locking step, the internal pressure in the jack is kept on a level with the third maximum to ensure the locking of the synchromesh in its operating position.
Claim 6
Dependent Claim
46 words
A method according to claim 1 characterized in that supplying the jack with the compressed air causes time interval S corresponding to the synchronization step proper to be greater than 55% of the total time T taken for the entire operation of control of the fork.
Claim 7
Independent Claim
112 words
A device for controlling the synchromesh of a gear box, wherein said device includes: a pneumatic jack, the movable part of which is connected to a fork which controls the synchromesh; a source of compressed air; a discharge circuit; a three-way electrovalve for connecting the jack either to the source of compressed air, or to the discharge circuit; a winding connected to the electrovalve; a means of sending a signal of execution from an operator; and an electric modulator, which receives the command of execution from the operator and sends a modulated signal to the winding of the electrovalve, which signal causes said electrovalve to open and close several times in succession.
Claim 8
Independent Claim
112 words
A device for controlling the synchromesh of a gear box, wherein said device includes: a pneumatic jack, the movable part of which is connected to a fork which controls the synchromesh; a source of compressed air; a discharge circuit; a three-way electrovalve for connecting the jack either to the source of compressed air, or to the discharge circuit; a winding connected to the electrovalve; a means of sending a signal of execution from an operator; and an electric modulator, which receives the command of execution from the operator and sends a modulated signal to the winding of the electrovalve, which signal causes said electrovalve to open and close several times in succession.
References Cited (Backward Citations)
US2731952A
Cited
US2734609A
Cited
US3424951A
Cited
US3470892A
Cited
US3469590A
Cited
US3516331A
Cited
US3530668A
Cited
US3596742A
Cited
US3659631A
Cited
US3739813A
Cited
US3674121A
Cited
US3823621A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |