US5667452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split torque transmission
Assignee: Caterpillar Inc
•
Filing: 1995-04-06
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Granted: 1997-09-16
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Expires: 2015-04-06
Abstract
Abstract A split torque transmission includes a hydrostatic transmission and a mechanical transmission both being driven by an engine. The output of the hydrostatic transmission and the mechanical transmission are both selectively coupled to a machine through a final output shaft. The mechanical transmission incudes a full range high forward and reverse mechanism selectively coupled to a planetary arrangement. The planetary arrangement sums the speed of the hydrostatic transmission with the full range high forward and reverse mechanism. This arrangement provides a smooth and continuous change in the speed of the machine in both the forward and reverse directions throughout its entire speed range which is identical in both directions of travel.
Inventors
- 👤 Alan R. Coutant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:31
CPC Classifications
F; F16; F16H; F16H47/00; F16H47/02; F16H47/04; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/088; F16H61/00; F16H61/38; F16H61/40; F16H61/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
A split torque transmission for a machine having a source of power and an output, comprising: a hydrostatic transmission having a variable displacement pump drivingly connected to the source of power and a variable displacement motor having an output shaft and being fluidly connected to the variable displacement pump; and a mechanical transmission drivingly connected to the source of power and having a full range high forward and reverse mechanism connected to the source of power, a planetary arrangement having a carrier and planet gears connected to the full range high forward and reverse mechanism, a ring gear connected to the output shaft of the variable displacement motor and selectively connectable to the output, a sun gear connected to the output and selectively connectable to the ring and operative to sum the outputs from the full range high forward and reverse mechanism and the variable displacement motor.
Claim 2
Dependent Claim
147 words
A split torque transmission for a machine having a source of power and an output, comprising: a hydrostatic transmission having a variable displacement pump drivingly connected to the source of power and a variable displacement motor having an output shaft and being fluidly connected to the variable displacement pump; and a mechanical transmission drivingly connected to the source of power and having a full range high forward and reverse mechanism connected to the source of power, a planetary arrangement having a carrier and planet gears connected to the full range high forward and reverse mechanism, a ring gear connected to the output shaft of the variable displacement motor and selectively connectable to the output, a sun gear connected to the output and selectively connectable to the ring and operative to sum the outputs from the full range high forward and reverse mechanism and the variable displacement motor.
Claim 3
Dependent Claim
54 words
The split torque transmission of claim 1 wherein the full range high forward and reverse mechanism and the hydrostatic transmission both act through the summing planetary arrangement to provide a continuing increase in the speed of the output with a corresponding decrease in the speed of the output shaft from the variable displacement motor.
Claim 4
Dependent Claim
26 words
The split torque transmission of claim 1 wherein the output shaft of the variable displacement motor is selectively connected to the output by a fluid clutch.
Claim 5
Dependent Claim
15 words
The split torque transmission of claim 1 wherein the planetary arrangement is a single planetary.
Claim 6
Dependent Claim
25 words
The split torque transmission of claim 1 wherein the full range mechanism is a countershaft gear train having a forward clutch and a reverse clutch.
Claim 7
Dependent Claim
24 words
The split torque transmission of claim 1 wherein the full range mechanism is connected to the carrier and planet gears of the summing planetary.
Claim 8
Dependent Claim
21 words
The split torque transmission of claim 1 wherein the variable motor is connected to the sun gear of the summing planetary.
References Cited (Backward Citations)
US2694470A
Cited
US2833160A
Cited
US3165947A
Cited
GB997085A
Cited
US3293943A
Cited
US3396607A
Cited
US3811343A
Cited
US3863524A
Cited
US3733931A
Cited
US3714845A
Cited
US3763918A
Cited
US3969958A
Cited
US3903755A
Cited
US3979972A
Cited
US4019404A
Cited
USRE30525E
Cited
US4341131A
Cited
US4304151A
Cited
US4434681A
Cited
US4363247A
Cited
US4682511A
Cited
US4754664A
Cited
JPS6383438A
Cited
US5113723A
Cited
JPH0419449A
Cited
US5203747A
Cited
JPH05215200A
Cited
JPH05332418A
Cited
JPH06101744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-15 | 2001-03-17 | 2001-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-15 | 2005-03-17 | 2005-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-15 | 2009-03-17 | 2009-09-16 | $7700.00 | Window Closed / Lapsed |