WO2010077786A2 - Externally mounted variator for split torque transmission - Google Patents

Externally mounted variator for split torque transmission Download PDF

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Publication number
WO2010077786A2
WO2010077786A2 PCT/US2009/067763 US2009067763W WO2010077786A2 WO 2010077786 A2 WO2010077786 A2 WO 2010077786A2 US 2009067763 W US2009067763 W US 2009067763W WO 2010077786 A2 WO2010077786 A2 WO 2010077786A2
Authority
WO
WIPO (PCT)
Prior art keywords
transmission
variator
pump
housing
split torque
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2009/067763
Other languages
French (fr)
Other versions
WO2010077786A3 (en
Inventor
Glen P. Calvert
Darren J. Hopf
Anandkumar Dhanaraj
Tony L. Marcott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Inc filed Critical Caterpillar Inc
Priority to CN2009801541806A priority Critical patent/CN102271950A/en
Priority to RU2011129660/11A priority patent/RU2011129660A/en
Priority to DE112009003745T priority patent/DE112009003745T5/en
Publication of WO2010077786A2 publication Critical patent/WO2010077786A2/en
Publication of WO2010077786A3 publication Critical patent/WO2010077786A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • F16H47/04—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type the mechanical gearing being of the type with members having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
    • F16H37/084—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths at least one power path being a continuously variable transmission, i.e. CVT
    • F16H2037/088—Power-split transmissions with summing differentials, with the input of the CVT connected or connectable to the input shaft

Definitions

  • This patent disclosure relates generally to split torque transmissions and, more particularly to a split torque transmission having an externally mounted variator.
  • a split torque transmission combines the outputs of a hydrostatic transmission and a mechanical transmission to rotate a drive shaft and move the machine. Providing both a hydrostatic transmission and a mechanical transmission can raise issues with respect to the serviceability of the transmission.
  • packaging the elements needed for both a hydrostatic transmission and a mechanical transmission in a single transmission unit may make it difficult to access some of the transmission components to perform service. This could lead to more time-consuming and costly service operations. Additionally, packaging the hydrostatic transmission and mechanical transmission in a single transmission unit may create issues with respect to the size and configuration of the transmission that make it more difficult to efficiently fit the transmission into the machine.
  • the disclosure describes, in one aspect a split torque transmission for a work machine.
  • the split torque transmission includes a transmission housing and a variator pump mounted to an exterior surface of the transmission housing.
  • a variator motor is operably coupled to the variator pump and mounted to the exterior surface of the transmission housing.
  • the disclosure describes a machine including an engine and a mechanical transmission operably coupled to the engine and housed in a transmission housing.
  • the machine further includes a hydrostatic transmission including a variator pump and a variator motor.
  • the variator pump is operably coupled to the engine and mounted to an exterior surface of the transmission housing and the variator motor is operably coupled to the variator pump and mounted to the exterior surface of the transmission housing.
  • the disclosure describes a transmission including a mechanical transmission housed in a transmission housing and having an output and a hydrostatic transmission including a variator pump and a variator motor.
  • the variator pump is mounted on an exterior surface of the transmission housing and the variator motor is operably coupled to the variator pump and is mounted on the exterior surface of the transmission housing.
  • the variator motor is operable to transmit torque to the output of the mechanical transmission.
  • FIG. 1 is a schematic block diagram of a machine with a split torque transmission according to the disclosure.
  • FIG. 2 is a perspective view of a split torque transmission according to the disclosure.
  • FIG. 3 is another perspective view of a split torque transmission according to the disclosure.
  • a machine that includes a split torque transmission 10 that is operably coupled to an engine 12.
  • the engine 12 can be, for example, a diesel engine, a gasoline engine, a natural gas engine, a gas-turbine engine, or any other engine known in the art.
  • the split torque transmission 10 includes a mechanical transmission 14 and a hydrostatic transmission 16 and can be configured to convert the rotational speed of the engine 12 into, for example, a drive speed for the machine.
  • the machine can be any type of machine that may utilize a split torque transmission, including particularly machines that operate at low speeds and where precise speed control is desired through the low speed ranges. Some examples of such machines include wheel loaders, track loaders, backhoes and tractors.
  • FIG. 1 may be equipped with one or more work elements such as loader buckets, backhoe buckets, forks and/or blades.
  • work elements such as loader buckets, backhoe buckets, forks and/or blades.
  • the hydrostatic transmission 16 includes a variator pump 18, which may comprise a variable displacement pump, drivingly connected to the engine 12 through a suitable input gear or gear arrangement.
  • the illustrated hydrostatic transmission 16 further includes a variator motor 20, which may comprise a fixed or a variable displacement motor.
  • the variator motor 20 may be fluidly connected to the variator pump 18 through appropriate fluid conduits 22, 24.
  • An output shaft 26 extends from the variator motor 20.
  • the variator motor 20 is operable to rotate the output shaft 26 in response to a pressurized fluid flow directed through the variator motor 20 by the variator pump 18.
  • the speed and torque of the output shaft 26 can be varied by varying the volumetric displacements of the variator motor 20 and the variator pump 18.
  • the mechanical transmission 14 is also drivingly connected to the engine 12 and is operable to adjust the speed and torque provided by the engine.
  • the mechanical transmission 14 may include one or more gear assemblies and clutch assemblies.
  • the mechanical transmission 14, and the split torque transmission 10 as a whole connects to the engine 12 via an input shaft 28 and is operable to rotate an output shaft 30, which may be drivingly connected to the drivetrain of the machine.
  • the output of the hydrostatic transmission 16 may be selectively combined with the output of the mechanical transmission 14 by connecting their respective output shafts 26, 30 via a suitable gear arrangement.
  • an implement pump 32 may be provided with the split torque transmission 10. As shown in FIG. 1, the implement pump 32 may be drivingly connected to the engine 12 and adapted to provide pressurized hydraulic fluid for moving and/or operating a work implement of the machine. Additionally, the implement pump 32 may have an associated charge pump 34 that also could be drivingly connected to the engine 12 and operable to pre-pressurize the hydraulic fluid before it is supplied to the implement pump 32 in order to reduce the work and/or energy that the implement pump must provide.
  • the implement and charge pumps 32, 34 may be fixed or variable displacement pumps as shown in FIG. 1.
  • the split torque transmission 10 can further include a transmission housing 36 within which at least a portion of the mechanical transmission 14 may be housed.
  • the transmission housing 36 includes first and second housing parts 38, 40 that are connected together via bolts.
  • the illustrated first housing part 38 is arranged closest the engine and the end that faces the engine, in this case, includes an outward facing cup-shaped recess 44 with a central opening out which the input shaft 28 for the transmission extends.
  • This cup shaped recess 44 may be connectable with a corresponding structure on an engine block associated with the engine or some other machine structure.
  • the variator pump 18 can be mounted on an exterior surface of the transmission housing 36. In this way, the variator pump 18 could be serviced without having to open the transmission housing 36.
  • the illustrated first housing part 38 includes at least one outwardly extending pump mounting portion 46 that has an exterior surface on which the variator pump 18 can be mounted.
  • the first housing part 38 includes three outwardly extending pump mounting portions: a mounting portion 46 for the variator pump 18, a mounting portion 48 on which the implement pump 32 can be mounted and a mounting portion 50 on which the charge pump 34 can be mounted.
  • each of the pump mounting portions 46, 48, 50 can include a respective mounting pad 52.
  • the mounting pads 52, and, as shown in FIG. 2, the variator pump 18, are provided on the side of the pump mounting portions 46, 48, 50 facing away from the engine (i.e., the input end of the transmission housing 36).
  • Each of the pump mounting portions 46, 48, 50 has a generally cylindrical configuration and extends outward from a forward (relative to the location of the engine) generally cylindrical section 54 of the first housing part 38.
  • One or more gear assemblies that drivingly connect the variator, implement and charge pumps 18, 32, 34 to the engine 12 via the transmission input shaft 28 can be contained in the respective pump mounting portions 46, 48, 50 and the cylindrical section 54 of the first housing part 38.
  • the second housing part 40 of the illustrated transmission housing 36 is arranged further from the engine and includes a main portion 56 that mates with the first housing part 38.
  • the second housing part 40 also includes an outwardly extending motor mounting portion 58 at its end furthest from the engine.
  • the variator motor 20 can be mounted on an exterior surface of the transmission housing 36 and in particular in the illustrated arrangement on the motor mounting portion 58.
  • the variator motor 20 is mounted on the side of the motor mounting portion 58 facing towards the engine such that the variator motor 20 and variator pump 18 face each other. This arrangement makes it easier to provide the fluid conduit connections between the variator motor 20 and the variator pump 18.
  • the variator motor 20 is mounted on the exterior surface of the motor mounting portion 58 such that the output shaft 26 of the variator motor 20 extends into the interior of the motor mounting portion 58 of the transmission housing 36.
  • the gear arrangement that connects the output shaft 26 of the variator motor 20 with the output shaft 30 of the mechanical transmission 14 can be contained within the second housing part 40 of the transmission housing 36 including in the interior of the motor mounting portion 58.
  • the first and second housing parts 38, 40 define a central generally box-shaped enclosure 60 that extends between the motor mounting portion 58 and the pump mounting portions 46, 48, 50 and in which portions of the gear and clutch assemblies associated with the mechanical transmission 14 can be contained.
  • the present disclosure is applicable to any machine that utilizes a split torque transmission such as wheel loaders, track loaders, backhoes and tractors.
  • a split torque transmission such as wheel loaders, track loaders, backhoes and tractors.
  • mounting the variator pump and variator motor of the split torque transmission on the external surface of the transmission housing improves serviceability of the transmission because the variator pump and motor can be accessed without opening the transmission housing.
  • spilt torque transmissions require both a hydrostatic component and a mechanical component, issues can arise with respect to the overall size and configuration of the transmission that can make it more difficult to package the transmission into a machine.
  • Arranging the variator motor and the variator pump on an external surface of the transmission housing can provide additional flexibility with regard to the overall packaging of a split torque transmission that can facilitate optimization of the arrangement and fit of the transmission in the machine.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Power Transmission Devices (AREA)

Abstract

A split torque transmission (10) for a work machine is provided. The split torque transmission (10) includes a transmission housing (36). A variator pump (18) is mounted to an exterior surface of the transmission housing (36). A variator motor (20) is operably coupled to the variator pump (18) and mounted to the exterior surface of the transmission housing (36).

Description

Description
EXTERNALLY MOUNTED VARIATOR FOR SPLIT TORQUE
TRANSMISSION
Technical Field
This patent disclosure relates generally to split torque transmissions and, more particularly to a split torque transmission having an externally mounted variator.
Background
Work machines, such as wheel loaders, track loaders, bulldozers and backhoes typically use a transmission to translate the rotational speed of an engine to a drive speed. These transmissions are generally operable to provide a series of gear ratios that translate the speed of the engine into different drive speeds. Some work machines are designed to work in low speed ranges and require precise speed control through these low speed ranges. To achieve this speed control, a split torque transmission may be used. A split torque transmission combines the outputs of a hydrostatic transmission and a mechanical transmission to rotate a drive shaft and move the machine. Providing both a hydrostatic transmission and a mechanical transmission can raise issues with respect to the serviceability of the transmission. In particular, packaging the elements needed for both a hydrostatic transmission and a mechanical transmission in a single transmission unit may make it difficult to access some of the transmission components to perform service. This could lead to more time-consuming and costly service operations. Additionally, packaging the hydrostatic transmission and mechanical transmission in a single transmission unit may create issues with respect to the size and configuration of the transmission that make it more difficult to efficiently fit the transmission into the machine.
Summary
The disclosure describes, in one aspect a split torque transmission for a work machine. The split torque transmission includes a transmission housing and a variator pump mounted to an exterior surface of the transmission housing. A variator motor is operably coupled to the variator pump and mounted to the exterior surface of the transmission housing.
In another aspect, the disclosure describes a machine including an engine and a mechanical transmission operably coupled to the engine and housed in a transmission housing. The machine further includes a hydrostatic transmission including a variator pump and a variator motor. The variator pump is operably coupled to the engine and mounted to an exterior surface of the transmission housing and the variator motor is operably coupled to the variator pump and mounted to the exterior surface of the transmission housing. According to another aspect, the disclosure describes a transmission including a mechanical transmission housed in a transmission housing and having an output and a hydrostatic transmission including a variator pump and a variator motor. The variator pump is mounted on an exterior surface of the transmission housing and the variator motor is operably coupled to the variator pump and is mounted on the exterior surface of the transmission housing. The variator motor is operable to transmit torque to the output of the mechanical transmission.
Brief Description of the Drawings FIG. 1 is a schematic block diagram of a machine with a split torque transmission according to the disclosure.
FIG. 2 is a perspective view of a split torque transmission according to the disclosure. FIG. 3 is another perspective view of a split torque transmission according to the disclosure.
Detailed Description
This disclosure relates to a split torque transmission. Referring to FIG. 1 of the drawings, a machine is schematically shown that includes a split torque transmission 10 that is operably coupled to an engine 12. The engine 12 can be, for example, a diesel engine, a gasoline engine, a natural gas engine, a gas-turbine engine, or any other engine known in the art. The split torque transmission 10 includes a mechanical transmission 14 and a hydrostatic transmission 16 and can be configured to convert the rotational speed of the engine 12 into, for example, a drive speed for the machine. The machine can be any type of machine that may utilize a split torque transmission, including particularly machines that operate at low speeds and where precise speed control is desired through the low speed ranges. Some examples of such machines include wheel loaders, track loaders, backhoes and tractors. The machines of
FIG. 1 may be equipped with one or more work elements such as loader buckets, backhoe buckets, forks and/or blades.
In the illustrated embodiment, the hydrostatic transmission 16 includes a variator pump 18, which may comprise a variable displacement pump, drivingly connected to the engine 12 through a suitable input gear or gear arrangement. The illustrated hydrostatic transmission 16 further includes a variator motor 20, which may comprise a fixed or a variable displacement motor. The variator motor 20 may be fluidly connected to the variator pump 18 through appropriate fluid conduits 22, 24. An output shaft 26 extends from the variator motor 20. The variator motor 20 is operable to rotate the output shaft 26 in response to a pressurized fluid flow directed through the variator motor 20 by the variator pump 18. In a known manner, the speed and torque of the output shaft 26 can be varied by varying the volumetric displacements of the variator motor 20 and the variator pump 18. -A-
The mechanical transmission 14 is also drivingly connected to the engine 12 and is operable to adjust the speed and torque provided by the engine. In a known manner, the mechanical transmission 14 may include one or more gear assemblies and clutch assemblies. In this case, the mechanical transmission 14, and the split torque transmission 10 as a whole, connects to the engine 12 via an input shaft 28 and is operable to rotate an output shaft 30, which may be drivingly connected to the drivetrain of the machine. The output of the hydrostatic transmission 16 may be selectively combined with the output of the mechanical transmission 14 by connecting their respective output shafts 26, 30 via a suitable gear arrangement.
To the extent the machine is provided with a work implement, an implement pump 32 may be provided with the split torque transmission 10. As shown in FIG. 1, the implement pump 32 may be drivingly connected to the engine 12 and adapted to provide pressurized hydraulic fluid for moving and/or operating a work implement of the machine. Additionally, the implement pump 32 may have an associated charge pump 34 that also could be drivingly connected to the engine 12 and operable to pre-pressurize the hydraulic fluid before it is supplied to the implement pump 32 in order to reduce the work and/or energy that the implement pump must provide. The implement and charge pumps 32, 34 may be fixed or variable displacement pumps as shown in FIG. 1.
The split torque transmission 10 can further include a transmission housing 36 within which at least a portion of the mechanical transmission 14 may be housed. In the illustrated embodiment, as shown in FIGS. 2 and 3, the transmission housing 36 includes first and second housing parts 38, 40 that are connected together via bolts. The illustrated first housing part 38 is arranged closest the engine and the end that faces the engine, in this case, includes an outward facing cup-shaped recess 44 with a central opening out which the input shaft 28 for the transmission extends. This cup shaped recess 44 may be connectable with a corresponding structure on an engine block associated with the engine or some other machine structure.
In order to allow for easier access to the variator pump 18 for service operations or the like, the variator pump 18 can be mounted on an exterior surface of the transmission housing 36. In this way, the variator pump 18 could be serviced without having to open the transmission housing 36. To this end, for receiving the variator pump 18, the illustrated first housing part 38 includes at least one outwardly extending pump mounting portion 46 that has an exterior surface on which the variator pump 18 can be mounted. In this case, the first housing part 38 includes three outwardly extending pump mounting portions: a mounting portion 46 for the variator pump 18, a mounting portion 48 on which the implement pump 32 can be mounted and a mounting portion 50 on which the charge pump 34 can be mounted. For receiving the respective pumps, the exterior surface of each of the pump mounting portions 46, 48, 50 can include a respective mounting pad 52. In this case, the mounting pads 52, and, as shown in FIG. 2, the variator pump 18, are provided on the side of the pump mounting portions 46, 48, 50 facing away from the engine (i.e., the input end of the transmission housing 36).
Each of the pump mounting portions 46, 48, 50 has a generally cylindrical configuration and extends outward from a forward (relative to the location of the engine) generally cylindrical section 54 of the first housing part 38. One or more gear assemblies that drivingly connect the variator, implement and charge pumps 18, 32, 34 to the engine 12 via the transmission input shaft 28 can be contained in the respective pump mounting portions 46, 48, 50 and the cylindrical section 54 of the first housing part 38.
The second housing part 40 of the illustrated transmission housing 36 is arranged further from the engine and includes a main portion 56 that mates with the first housing part 38. The second housing part 40 also includes an outwardly extending motor mounting portion 58 at its end furthest from the engine. Again, to allow for easier access to the variator motor 20 for service or the like, the variator motor 20 can be mounted on an exterior surface of the transmission housing 36 and in particular in the illustrated arrangement on the motor mounting portion 58. In this case, the variator motor 20 is mounted on the side of the motor mounting portion 58 facing towards the engine such that the variator motor 20 and variator pump 18 face each other. This arrangement makes it easier to provide the fluid conduit connections between the variator motor 20 and the variator pump 18.
In the illustrated embodiment, the variator motor 20 is mounted on the exterior surface of the motor mounting portion 58 such that the output shaft 26 of the variator motor 20 extends into the interior of the motor mounting portion 58 of the transmission housing 36. The gear arrangement that connects the output shaft 26 of the variator motor 20 with the output shaft 30 of the mechanical transmission 14 can be contained within the second housing part 40 of the transmission housing 36 including in the interior of the motor mounting portion 58. Additionally when assembled, the first and second housing parts 38, 40 define a central generally box-shaped enclosure 60 that extends between the motor mounting portion 58 and the pump mounting portions 46, 48, 50 and in which portions of the gear and clutch assemblies associated with the mechanical transmission 14 can be contained.
Industrial Applicability
The present disclosure is applicable to any machine that utilizes a split torque transmission such as wheel loaders, track loaders, backhoes and tractors. With such machines, mounting the variator pump and variator motor of the split torque transmission on the external surface of the transmission housing improves serviceability of the transmission because the variator pump and motor can be accessed without opening the transmission housing.
Additionally, because spilt torque transmissions require both a hydrostatic component and a mechanical component, issues can arise with respect to the overall size and configuration of the transmission that can make it more difficult to package the transmission into a machine. Arranging the variator motor and the variator pump on an external surface of the transmission housing can provide additional flexibility with regard to the overall packaging of a split torque transmission that can facilitate optimization of the arrangement and fit of the transmission in the machine.
It will be appreciated that the foregoing description provides examples of the disclosed system and technique. However, it is contemplated that other implementations of the disclosure may differ in detail from the foregoing examples. All references to the disclosure or examples thereof are intended to reference the particular example being discussed at that point and are not intended to imply any limitation as to the scope of the disclosure more generally. All language of distinction and disparagement with respect to certain features is intended to indicate a lack of preference for those features, but not to exclude such from the scope of the disclosure entirely unless otherwise indicated. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context.

Claims

Claims
1. A split torque transmission (10) for a work machine comprising: a transmission housing (36); a variator pump (18) mounted to an exterior surface of the transmission housing (36); and a variator motor (20) operably coupled to the variator pump (18) and mounted to the exterior surface of the transmission housing (36).
2. The split torque transmission (10) of claim 1 further including a mechanical transmission (14) at least a portion of which is arranged in the transmission housing (36).
3. The split torque transmission ( 10) of any of claims 1 -2 wherein the transmission housing (36) includes a first housing part (38) and a second housing part (40).
4. The split torque transmission (10) of claim 3 wherein the variator pump (18) is mounted to the exterior surface of the first housing part (38) and the variator motor (20) is mounted to the exterior surface of the second housing part (40).
5. The split torque transmission (10) of any of claims 1 -4 wherein the transmission housing (36) includes a mounting portion (46, 48, 50) configured for mounting of an implement pump (32) on an exterior surface thereof.
6. The split torque transmission (10) of any of claims 1 -5 wherein the transmission housing (36) includes a mounting portion (46, 48, 50) configured for mounting of a charge pump (34) on an exterior surface thereof.
7. The split torque transmission (10) of claim 2 wherein the variator motor (20) is operable to transmit torque to an output side of the mechanical transmission (14).
8. The split torque transmission ( 10) of any of claims 1-7 wherein the exterior surface of the transmission housing (36) includes a variator pump mounting portion (46) on which the variator pump (18) is mounted.
9. The split torque transmission (10) of any of claims 1 -8 wherein the exterior surface of the transmission housing (36) includes a variator motor mounting portion (58) on which the variator motor (20) is mounted.
10. A machine having a split torque transmission (10) according to any of claims 1-9, the machine comprising: an engine (12); a mechanical transmission (14) operably coupled to the engine
(12) at least a portion of which is housed in the transmission housing (36); and a hydrostatic transmission (16) including the variator pump (18) and the variator motor (20), wherein the variator pump is operably coupled to the engine (12) and mounted to an exterior surface of the transmission housing (36) and the variator motor (20) is operably coupled to the variator pump (18) and mounted to the exterior surface of the transmission housing (36).
PCT/US2009/067763 2008-12-17 2009-12-11 Externally mounted variator for split torque transmission Ceased WO2010077786A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2009801541806A CN102271950A (en) 2008-12-17 2009-12-11 External Converter for Torque Split Transmission
RU2011129660/11A RU2011129660A (en) 2008-12-17 2009-12-11 EXTERNAL VARIATOR FOR DRIVE WITH BRANCHED POWER FLOW
DE112009003745T DE112009003745T5 (en) 2008-12-17 2009-12-11 Externally mounted variator for a torque split transmission

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US13840108P 2008-12-17 2008-12-17
US61/138,401 2008-12-17
US12/620,096 2009-11-17
US12/620,096 US20100146960A1 (en) 2008-12-17 2009-11-17 Externally mounted variator for split torque transmission

Publications (2)

Publication Number Publication Date
WO2010077786A2 true WO2010077786A2 (en) 2010-07-08
WO2010077786A3 WO2010077786A3 (en) 2010-09-16

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PCT/US2009/067763 Ceased WO2010077786A2 (en) 2008-12-17 2009-12-11 Externally mounted variator for split torque transmission

Country Status (5)

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US (1) US20100146960A1 (en)
CN (1) CN102271950A (en)
DE (1) DE112009003745T5 (en)
RU (1) RU2011129660A (en)
WO (1) WO2010077786A2 (en)

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US20100146960A1 (en) 2010-06-17
WO2010077786A3 (en) 2010-09-16
RU2011129660A (en) 2013-01-27
DE112009003745T5 (en) 2013-03-14
CN102271950A (en) 2011-12-07

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