WO2007052217A1 - Transmission a variation continue - Google Patents

Transmission a variation continue Download PDF

Info

Publication number
WO2007052217A1
WO2007052217A1 PCT/IB2006/054026 IB2006054026W WO2007052217A1 WO 2007052217 A1 WO2007052217 A1 WO 2007052217A1 IB 2006054026 W IB2006054026 W IB 2006054026W WO 2007052217 A1 WO2007052217 A1 WO 2007052217A1
Authority
WO
WIPO (PCT)
Prior art keywords
coupled
continuously variable
transmission according
variable ratio
ratio transmission
Prior art date
Application number
PCT/IB2006/054026
Other languages
English (en)
Inventor
Davide Piovano
Giorgio Napolitani
Marcello Vinassa
Original Assignee
Graziano Trasmissioni S.P.A.
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 Graziano Trasmissioni S.P.A. filed Critical Graziano Trasmissioni S.P.A.
Publication of WO2007052217A1 publication Critical patent/WO2007052217A1/fr

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
    • 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
    • F16H37/0846—CVT using endless flexible members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/28—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or type of power take-off
    • 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 variators with summing differentials, with the input of the CVT connected or connectable to the input shaft

Definitions

  • the present invention relates to a continuously variable ratio transmission for motor vehicles, such as agricultural tractors and operating machines in general .
  • One object of the present invention is to provide an improved continuously variable ratio transmission type.
  • a transmission comprising: an input shaft adapted to be operationally coupled to a prime mover; a variator unit including a pair of expandable pulleys, i.e. driving pulley and driven pulley, which are connected together by a flexible drive element; the driving pulley being operationally coupled to the input shaft; and an epicyclic gear train having an input gearwheel coupled to the driving pulley of the variator unit, an intermediate gearwheel coupled to the driven pulley of said variator unit, and a rotatable output* member intended to be coupled to an axle of the motor vehicle.
  • the driving pulley and the driven pulley of the variator unit are coupled, respectively, to an input sun gear and to the train carrier of the epicyclic gear train which has an output crown wheel operationally coupled to the abovementioned axle.
  • Figure 1 is a schematic illustration of a continuously variable ratio transmission according to the present invention
  • Figure 2 is a partial cross-sectional view of part of the transmission according to Figure 1;
  • Figures 3 and 4 are partially sectioned views of two different embodiments of a transmission according to the invention.
  • the transmission 1 denotes overall a transmission according to the invention.
  • the transmission 1 comprises an input shaft 2 operationally connected to a prime mover E, in particular an internal combustion engine.
  • the input shaft 2 can be selectively connected to a gearwheel 3 or to a gearwheel 4 by means of a double friction clutch denoted overall by 5.
  • the gearwheel 3 meshes with a gearwheel 6 rigid with a shaft 7.
  • the gearwheel 4 is coupled by means of an intermediate gearwheel 8 to a gearwheel 9 which is likewise rigid with the shaft 7.
  • the transmission 1 also comprises a variator unit 10 including a pair of expandable pulleys 11 and 12, i.e. driving pulley and driven pulley, which are connected together by a flexible drive element 13, for example a metal chain (see also Figure 2) .
  • a variator unit 10 including a pair of expandable pulleys 11 and 12, i.e. driving pulley and driven pulley, which are connected together by a flexible drive element 13, for example a metal chain (see also Figure 2) .
  • the pulley 11 is rotationally rigid with the shaft 7, whereas the driven pulley 12 is rotationally rigid with a shaft 14.
  • An epicyclic gear train denoted overall by 15 is coupled to the variator unit 10.
  • the gear train 15 comprises an input sun gear 16 rotationally coupled to the shaft 7 by means of a speed reducer comprising a gearwheel 17 rigid with the shaft 7 and a gearwheel 18 rigid with said input sun gear.
  • the gear train 15 also comprises a train carrier - denoted overall by 19 - which supports a plurality of planetary gears 20, only one of which is shown in Figure 1.
  • the driven pulley 12 of the variator unit 10 is coupled to the train carrier 19 of the epicyclic gear train 15 by means of a speed reducing gear comprising a gearwheel 21 rigid with the shaft 14 and meshing with a gearwheel 22 of the train carrier 19.
  • the gear train 15 comprises an output crown wheel 23 rigid with a shaft 24.
  • This shaft is coupled to the differential unit 26 of an axle A (in particular the rear axle) of the vehicle, by means of a speed reducing system with bevel gear pair 25.
  • the axle A comprises two half shafts 27 and 28, the inner ends of which are connected together by means of the differential 26 and the outer ends of which are connected to respective wheels W (only the left-hand one of which is shown in Figure 1) , by means of end speed reducers with gears 29 conveniently of the epicyclic type.
  • the movement imparted by the motor E is transmitted to the primary or driving pulley 11 of the variator 10 (and therefore to the input sun gear 16 of the gear train 15) with predetermined and unvaried transmission ratios.
  • the movement is instead transmitted to the train carrier 19 of the gear train 15 with a variable transmission ratio, this train carrier being coupled to the secondary or driven pulley 12 of the variator 10.
  • the epicyclic gear train 15 allows the SOTcalled span (ratio between the maximum and minimum speeds) of the variator unit to be amplified or expanded, for example up to 60-70 times.
  • the transmission 1 has a rear power take-off shaft 33 which can be coupled to a shaft 34 rotationally rigid with the shaft 2, by means of a friction clutch 35 and, selectively, by means of a first or a second speed reducer formed by two gearwheels 36, 37 and by two gearwheels 30, 31, respectively.
  • These speed reducers produce speed ratios which differ from each other and can be selectively engaged between the shaft 33 and the shaft 34 by means of a clutch 59 for example of the type with frontal teeth.
  • the gearwheels 31 and 37 are idle with respect to the shaft 33, to which they can be rotationally locked by means of the clutch 59.
  • the rear power take-off shaft 33 can thus be selectively actuated at two different speeds, for example at 540 or 750 rpm.
  • the shaft 34 extends above the belt 13 which connects the pulleys 11 and 12 of the variator unit 10.
  • the gearwheel 31 meshes with a gearwheel 50 mounted on a shaft 51.
  • the shaft 51 can be coupled to a power take-off shaft 43, which is conveniently located between the rear axle A and the front axle (not shown) preferably in a so-called “belly" position.
  • This power take-off is used, for example, for the operation of tools (for example grass cutters) mounted between the vehicle axles .
  • belly power take-off 43 is independent of the rear power take-off ,33.
  • the output shaft 24 of the epicyclic gear train 15 can be coupled to a shaft 44 by means of a speed reducer formed by gearwheels 45 and 46 and by means of a clutch 47, for example of the type with frontal teeth.
  • the shaft 44 is coupled to the wheels of the other axle of the vehicle (front axle) .
  • the clutch 47 when closed, allows traction by means of four driving wheels to be performed.
  • the shaft 44 extends below the drive belt 13 of the variator unit 10. Moreover, the shaft 44 is aligned, albeit separately, with respect to the shaft 51 actuating the belly power take-off shaft 43.
  • the reversing assembly comprising the gearwheels 4, 8 and 9 and the clutch 5 may be eliminated.
  • the reversing assembly comprising the gearwheels 4, 8 and 9 and the clutch 5.
  • the double friction clutch two friction clutches in an oil bath
  • a dry friction clutch in order to separate the motor E from the transmission 1.
  • the epicyclic gear train 15 comprises an output gearwheel 60 which with its teeth is able to mate with a toothed blocking segment 61.
  • This toothed segment 61 can be operationally displaced (as indicated by the double arrow in Figure 1) between an inactive position (shown in said figure) where it allows rotation of the wheel 60 and an active position (not shown) where it meshes with the teeth of the wheel 60 and prevents rotation thereof.
  • the toothed segment 61 in the active position allows blocking of the entire transmission 1, for example during parking of the vehicle, independently of operation of the brakes.
  • Figure 3 shows a further embodiment of a transmission according to the invention.
  • Figure 3 in which parts and components already described are distinguished by the same reference numbers used above, shows in particular a variation of embodiment of the assembly comprising the epicyclic gear train 15.
  • the variant of Figure 3 differs in the following aspects: the toothed segment 61 and the associated gearwheel 60 have been eliminated, i.e. the transmission blocking function has been eliminated; the gearwheel 45 is no longer rigid with the shaft 24, but is instead mounted idle thereon; this wheel 45 is, however, rigid with the crown wheel 23 of the gear train 15; a hub 48 is mounted on the shaft 24 by means of a splined coupling 49 and is therefore rotationally rigid with this shaft; the hub 48 has, axially slidably mounted thereon, an engaging/disengaging sleeve 50 which is rotationally rigid with this hub; the sleeve 50 is able to be displaced axially into an engaging position where it rotationally couples the hub 48 to the gearwheel 45 (by means of a crown wheel 45a of the latter) and therefore rotationally locks this gearwheel 45 to the shaft 24.
  • Figure 4 shows a further constructional variant in which, compared to Figure 3, the differences are essentially the following: the engaging/disengaging sleeve 50 has a jacket 50a provided peripherally with teeth 50b by means of which it is able to engage a toothed blocking segment 61 displaceable along a stationary guide stem 62 by means of a control lever 63 with which a disengageable retaining device 64 is associated; the latter is able to keep the lever 63 in the position where the blocking .
  • the axial position of the engaging/disengaging sleeve 50 is controlled by a displaceable member 65, conveniently mounted slidably on the said guide stem 62 mentioned above; the displaceable member 65 may also have associated with it a releasable retaining device - denoted ' by 66 - which keeps said member 65 in the position (shown in Figure 4) where the sleeve 50 rotationally couples the gearwheel ' 45 to the shaft 24.
  • the control lever 63 is able to assume three different working positions : a first position where the member 61 engages with and blocks the sleeve 50, blocking in fact the entire transmission (for example during parking) ; in this condition the member 65 owing to the action of a spring 67 keeps the sleeve 50 in the position shown in Figure 4 where it rotationally couples the gearwheel 45 to the shaft 24; a second position where the member 61 is disengaged from the sleeve 50, so that the transmission is released, whereas, owing to the action of the spring 67, the member 65 keeps the sleeve in the position where it rotationally locks the gearwheel 45 to the shaft 24; and a third position where the member 61 is disengaged from the sleeve 50 and, against the action of the spring 67, keeps the member 65 in a position where the sleeve 50 releases the gearwheel 45 from the shaft 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Transmission Devices (AREA)

Abstract

Transmission (1) comportant un arbre d'entrée (2) qui peut être accouplé de manière opérationnelle sur un moteur (E), un module variateur (10) comprenant une paire de poulies extensibles (11, 12), c'est-à-dire une poulie motrice (11) et une poulie réceptrice (12), qui sont accouplées ensemble par un élément d'entraînement flexible (13) ; la poulie motrice (11) étant accouplée de manière opérationnelle sur l'arbre d'entrée (2) ; et un engrenage planétaire (15) ayant une roue dentée d'entrée (16) accouplée sur la poulie motrice (11) du module variateur (10), une roue dentée intermédiaire (19, 22) accouplée sur la poulie réceptrice (12) du module variateur (10), et un organe de sortie rotatif (23) destiné à être accouplé sur un essieu (A) du véhicule à moteur.
PCT/IB2006/054026 2005-11-02 2006-10-31 Transmission a variation continue WO2007052217A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20050778 ITTO20050778A1 (it) 2005-11-02 2005-11-02 Trasmissione a rapporto variabile in modo continuo
ITTO2005A000778 2005-11-02

Publications (1)

Publication Number Publication Date
WO2007052217A1 true WO2007052217A1 (fr) 2007-05-10

Family

ID=37779397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/054026 WO2007052217A1 (fr) 2005-11-02 2006-10-31 Transmission a variation continue

Country Status (2)

Country Link
IT (1) ITTO20050778A1 (fr)
WO (1) WO2007052217A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106715179A (zh) * 2014-07-30 2017-05-24 传输Cvt股份有限公司 设置有双功能连续可变变速器的用于非公路车辆的传动系

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256692A5 (en) * 1973-12-26 1975-07-25 Weigel Jean Stepless variable speed drive - uses belt drive with coned pulleys together with epicyclic gear train
FR2305651A1 (fr) * 1975-03-24 1976-10-22 Nat Invest Holding Inc Transmission mecanique a variateur continu de vitesse, en particulier pour l'avancement de motoculteurs, tracteurs et analogues
GB2035510A (en) * 1977-12-15 1980-06-18 Lely Nv C Van Der Chain for use with mechanical torque converter
GB1599953A (en) * 1977-04-14 1981-10-07 Bales Mccoin Research Inc Traction controlled in-line transmission
US4294131A (en) * 1977-11-10 1981-10-13 Kubota, Ltd. Tractor travelling system transmission mechanism
US4579183A (en) * 1984-02-20 1986-04-01 Kanzaki Kokyukoki Mfg. Co., Ltd. Transmission for self-propelled working vehicles
US4624153A (en) * 1982-12-13 1986-11-25 Toyota Jidosha Kabushiki Kaisha Continuously variable transmission
EP0809044A2 (fr) * 1996-05-25 1997-11-26 ZF FRIEDRICHSHAFEN Aktiengesellschaft Variateur continu de vitesse
DE19627407A1 (de) * 1996-07-06 1998-01-08 Zahnradfabrik Friedrichshafen Getriebe
EP0889260A2 (fr) * 1997-07-04 1999-01-07 ZF FRIEDRICHSHAFEN Aktiengesellschaft Transmission à variation continue
DE29816863U1 (de) * 1997-09-20 1999-04-01 Meyerle, Michael, 88074 Meckenbeuren Stufenloses Getriebe, insbesondere mit Leistungsverzweigung
US20020094911A1 (en) * 2001-01-16 2002-07-18 Haka Raymond James Dual mode, geared neutral continuously variable transmission
EP1378686A2 (fr) * 2002-07-05 2004-01-07 CNH Italia S.p.A. Transmission variable continué pour véhicules automobiles notamment pour tracteurs agricoles
EP1555458A2 (fr) * 2004-01-16 2005-07-20 CNH Italia S.p.A. Transmission variable continué pour véhicules automobiles notamment pour tracteurs agricoles

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2256692A5 (en) * 1973-12-26 1975-07-25 Weigel Jean Stepless variable speed drive - uses belt drive with coned pulleys together with epicyclic gear train
FR2305651A1 (fr) * 1975-03-24 1976-10-22 Nat Invest Holding Inc Transmission mecanique a variateur continu de vitesse, en particulier pour l'avancement de motoculteurs, tracteurs et analogues
GB1599953A (en) * 1977-04-14 1981-10-07 Bales Mccoin Research Inc Traction controlled in-line transmission
US4294131A (en) * 1977-11-10 1981-10-13 Kubota, Ltd. Tractor travelling system transmission mechanism
GB2035510A (en) * 1977-12-15 1980-06-18 Lely Nv C Van Der Chain for use with mechanical torque converter
US4624153A (en) * 1982-12-13 1986-11-25 Toyota Jidosha Kabushiki Kaisha Continuously variable transmission
US4579183A (en) * 1984-02-20 1986-04-01 Kanzaki Kokyukoki Mfg. Co., Ltd. Transmission for self-propelled working vehicles
EP0809044A2 (fr) * 1996-05-25 1997-11-26 ZF FRIEDRICHSHAFEN Aktiengesellschaft Variateur continu de vitesse
DE19627407A1 (de) * 1996-07-06 1998-01-08 Zahnradfabrik Friedrichshafen Getriebe
EP0889260A2 (fr) * 1997-07-04 1999-01-07 ZF FRIEDRICHSHAFEN Aktiengesellschaft Transmission à variation continue
DE29816863U1 (de) * 1997-09-20 1999-04-01 Meyerle, Michael, 88074 Meckenbeuren Stufenloses Getriebe, insbesondere mit Leistungsverzweigung
US20020094911A1 (en) * 2001-01-16 2002-07-18 Haka Raymond James Dual mode, geared neutral continuously variable transmission
EP1378686A2 (fr) * 2002-07-05 2004-01-07 CNH Italia S.p.A. Transmission variable continué pour véhicules automobiles notamment pour tracteurs agricoles
EP1555458A2 (fr) * 2004-01-16 2005-07-20 CNH Italia S.p.A. Transmission variable continué pour véhicules automobiles notamment pour tracteurs agricoles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VAHABZADEH H ET AL: "Split-torque, geared-neutral infinitely Variable Transmission mechanism", INTERNATIONAL AUTOMOBILE TECHNICAL CONGRESS, 7 May 1990 (1990-05-07), pages 687 - 695, XP002129345 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106715179A (zh) * 2014-07-30 2017-05-24 传输Cvt股份有限公司 设置有双功能连续可变变速器的用于非公路车辆的传动系
EP3174751A4 (fr) * 2014-07-30 2018-04-04 Transmission CVT Corp Inc. Chaîne cinématique pour véhicules hors route équipée d'une transmission à variation continu à double fonction
US10449855B2 (en) 2014-07-30 2019-10-22 Transmission Cvt Corp Inc. Driveline for off-highway vehicles provided with a dual function CVT

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