US4567969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gearshift system for an automobile
Assignee: Subaru Corp
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Filing: 1983-08-22
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Granted: 1986-02-04
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Expires: 2003-08-22
Abstract
Abstract A gearshift system for an automobile with an electromagnetic powder clutch and a transmission having four forward-gear sets. The system comprises a first synchronizing device for selectively engaging a second speed gear and a fourth speed gear with an output shaft of the transmission, a second synchronizing device for selectively engaging a first speed gear and a third speed gear with the output shaft, a first shifter arm for operating the first synchronizing device, and a second shifter arm for operating the second synchronizing device. A select lever is provided to engage one of the first and second shifter arms. The select lever is operated by a manual shift lever for shifting one of the shifter arms. Further, the select lever is moved by an electric actuator so as to engage with one of the shifter arms for the selection of the synchronizing device. Switches are provided for producing signals representing a selection of one of the synchronizing device, and a thermo switch responsive to the temperature of the automatic clutch for producing an output signal when the temperature exceeds a predetermined temperature. A control circuit is responsive to the signals of the switches for operating the electric actuator to select one of the synchronizing devices, and responsive to the output signal of the thermo switch for operating the electric actuator to select the second synchronizing device.
Inventors
- 👤 Fujio Makita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:36
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/26; F16H61/28; F16H61/32; F16H59/00; F16H59/02; F16H59/04; F16H59/044; F16H2059/047; F16H2061/2876; F16H3/00; F16H3/02; F16H3/08; F16H3/087; F16H3/089; F16H63/00; F16H63/40; F16H63/48; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19437; Y10T74/20; Y10T74/20012; Y10T74/20018; Y10T74/2003; Y10T74/20085; Y10T74/20098
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
238 words
A gearshift system for an automobile with an automatic clutch and a transmission having four forward-gear sets, comprising: a first synchronizing device for selectively engaging a second speed gear and a fourth speed gear with an output shaft of said transmission, said second speed gear having a gear ratio producing a sufficient torque to start said automobile; a second synchronizing device for selectively engaging a first speed gear and a third speed gear with said output shaft; a first shifter means for operating said first synchronizing device; a second shifter means for operating said second synchronizing device; a select lever adapted to engage one of said first and second shifter means; a manually operated shift lever; means for transmitting the shift of said shift lever to said select lever for shifting one of said shifter means; an electrical select device for operating said select lever means to engage with one of said shifter means; switch means for producing signals representing a selection of one of said synchronizing devices; a thermo switch responsive to the temperature of said automatic clutch for producing an output signal when the temperature exceeds a predetermined temperature; and control circuit means responsive to said signals of said switch means for operating said electrical select device to select one of said synchronizing devices, and responsive to said output signal of said thermo switch for operating said electrical select device to select said second synchronizing device.
Claim 2
Dependent Claim
238 words
A gearshift system for an automobile with an automatic clutch and a transmission having four forward-gear sets, comprising: a first synchronizing device for selectively engaging a second speed gear and a fourth speed gear with an output shaft of said transmission, said second speed gear having a gear ratio producing a sufficient torque to start said automobile; a second synchronizing device for selectively engaging a first speed gear and a third speed gear with said output shaft; a first shifter means for operating said first synchronizing device; a second shifter means for operating said second synchronizing device; a select lever adapted to engage one of said first and second shifter means; a manually operated shift lever; means for transmitting the shift of said shift lever to said select lever for shifting one of said shifter means; an electrical select device for operating said select lever means to engage with one of said shifter means; switch means for producing signals representing a selection of one of said synchronizing devices; a thermo switch responsive to the temperature of said automatic clutch for producing an output signal when the temperature exceeds a predetermined temperature; and control circuit means responsive to said signals of said switch means for operating said electrical select device to select one of said synchronizing devices, and responsive to said output signal of said thermo switch for operating said electrical select device to select said second synchronizing device.
Claim 3
Dependent Claim
18 words
The gearshift system for an automobile according to claim 1, wherein said automatic clutch is an electromagnetic clutch.
Claim 4
Dependent Claim
19 words
The gearshift system for an automobile according to claim 1, wherein said automatic clutch is an electromagnetic powder clutch.
Claim 5
Dependent Claim
95 words
The gearshift system for an automobile according to claim 1, wherein said each of first and second shifter means comprises a shifter rail operatively connected to a corresponding synchronizing device and a shifter arm secured to the shifter rail and having a fork adapted to be engaged with an end of said select lever, and said transmitting means comprises an actuating rod operatively connected to said shift lever at one end thereof, and a fork secured to said actuating rod at the other end thereof and engaged with the other end of said select lever.
Claim 6
Dependent Claim
61 words
The gearshift system for an automobile according to claim 1, wherein said electrical select device comprises a slidable select shaft rotatably engaged with said select lever at an axis of the select lever, and an electric actuator for axially sliding said select shaft, said select lever engages with said select shaft so as to be axially moved by the select shaft.
Claim 7
Dependent Claim
21 words
The gearshift system for an automobile according to claim 1, wherein said switch means comprises switches mounted on said shift lever.
Claim 8
Dependent Claim
33 words
The gearshift system for an automobile according to claim 1, wherein said control circuit means comprises a logic circuit responsive to said signals for producing output signals for operating said electrical select device.
References Cited (Backward Citations)
US2034400A
Cited
US3793898A
Cited
US4403683A
Cited
US4484672A
Cited
US4461374A
Cited
US4449619A
Cited
US4473142A
Cited
US4463623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |