US4802384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure for shifting a transmission composed of several gear units
Assignee: Deere and Co
•
Filing: 1987-09-30
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Granted: 1989-02-07
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Expires: 2007-09-30
Abstract
Abstract A procedure for shifting a transmission composed of several gear units in which a number of synchronizer linkages are provided, is so designated that during a gear ratio change in the last gear unit, that is in that unit to which the speed of all preceding gear units must be brought, all shift linkages are initially released. Following this, the shift linkages are re-established beginning with the last gear unit. By this means unnecessary rotating inertias are decoupled, and the shift linkages, and particularly any synchronizing devices, can be reduced in size.
Inventors
- 👤 Reinhard Schwarz
- 👤 Heinz Stuhrmann
- 👤 Dieter Nobis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:07
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/70; F16H3/00; F16H3/02; F16H3/08; F16H3/087; F16H3/091; F16H3/44; F16H3/46; F16H3/48; F16H3/52; F16H3/56; F16H37/00; F16H37/02; F16H37/04; F16H37/042; F16H61/04; F16H61/08; F16H2061/085; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19167; Y10T74/19219; Y10T74/19251
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
A process for shifting a transmission having: (i) a first gear unit drivably connectible to an engine; (ii) a last gear unit having at least one synchronizer to drivingly connect the last gear unit to at least one driven component; (iii) at least one intermediate gear unit releasably connecting said first and last gear units, the process comprising: (i) releasing said at least one synchronizer and said at least one intermediate gear unit; (ii) connecting said at least one synchronizer; (iii) connecting said at least one intermediate gear unit.
Claim 2
Dependent Claim
89 words
A process for shifting a transmission having: (i) a first gear unit drivably connectible to an engine; (ii) a last gear unit having at least one synchronizer to drivingly connect the last gear unit to at least one driven component; (iii) at least one intermediate gear unit releasably connecting said first and last gear units, the process comprising: (i) releasing said at least one synchronizer and said at least one intermediate gear unit; (ii) connecting said at least one synchronizer; (iii) connecting said at least one intermediate gear unit.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein said step (i) further comprises releasing said first gear unit and said process comprises an additional step (iv) of connecting said first gear unit.
Claim 4
Dependent Claim
12 words
The process of claim 1, wherein the shifting operation is performed automatically.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |