WO2018083458A1 - Transmissions - Google Patents

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Publication number
WO2018083458A1
WO2018083458A1 PCT/GB2017/053279 GB2017053279W WO2018083458A1 WO 2018083458 A1 WO2018083458 A1 WO 2018083458A1 GB 2017053279 W GB2017053279 W GB 2017053279W WO 2018083458 A1 WO2018083458 A1 WO 2018083458A1
Authority
WO
WIPO (PCT)
Prior art keywords
driving
driven
disc
input
transmission
Prior art date
Application number
PCT/GB2017/053279
Other languages
English (en)
Inventor
David Mcmanamon
Original Assignee
Transfiniti Limited
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 Transfiniti Limited filed Critical Transfiniti Limited
Publication of WO2018083458A1 publication Critical patent/WO2018083458A1/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
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/08—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B is a disc with a flat or approximately flat friction surface
    • F16H15/10—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B is a disc with a flat or approximately flat friction surface in which the axes of the two members cross or intersect
    • 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
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/08—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B is a disc with a flat or approximately flat friction surface
    • F16H15/14—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B is a disc with a flat or approximately flat friction surface in which the axes of the members are parallel or approximately parallel
    • 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
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion

Definitions

  • This invention relates to transmissions, for example, transmissions suitable for use in motor vehicles and the like.
  • Infinitely Variable Transmissions (“IVTs") are well-known, and often comprise an epicyclic gear set.
  • An epicyclic gear set has the beneficial property of having two inputs and an output. By varying the relative speeds and/or directions of the inputs, the speed and/or direction of the output can be adjusted.
  • a variator typically has a driving disc and a driven disc, and the relative speeds of the driving and driven discs can be adjusted, for example, by using rollers, whose contact points with the driving and driven discs are adjustable. By adjusting the position of the rollers' contact points, this results in the driving and driven discs rotating at different speeds and/or in different directions. Therefore, by connecting the discs separately to the two inputs of the epicyclic gear set, the output speed and/or direction of the epicyclic gear set can be selected at will.
  • This invention aims to provide an improved and/or alternative transmission and/or an improved and/or alternative IVT.
  • a transmission comprising an input shaft connected to the input of a disc variator and one input of an epicyclic gear set, wherein an output of the disc variator is connected to another input of the epicyclic gear set
  • the disc variator comprising: a driving disc affixed to the input shaft and a driven disc driven at the same speed, but in an opposite direction to, the driving disc; a roller mounted between, and thus driven for rotation by, the driving and driven discs, the roller driving the output of the disc variator; and being axially moveable relative to the driving and driven discs so as to contact the driving and driven discs at a selected radial position, the speed of the primary output shaft thus being determined by the said selected radial position.
  • a transmission comprising an input system and an output system: the input system comprising a disc variator comprising: in input shaft connected to a power source; a driving disc affixed to the input shaft; a driven disc mounted for rotation about the input shaft; and means for driving the driven disc at the same speed, but in an opposite direction to, the driving disc - the output system comprising: a roller mounted between, and thus driven for rotation by, the driving and driven discs; the roller driving an axle forming a primary output shaft; and the roller being axially moveable relative to the driving and driven discs so as to contact the driving and driven discs at a selected radial position, the speed of the primary output shaft thus being determined by the said selected radial position; and an epicyclic gear set comprising: a first input connected to the input shaft; a second input connected to the primary output shaft; and an output, the speed of the output being a function of the speeds of the first and second inputs.
  • the transmission suitably comprises two output systems, each output system comprising: a roller, the roller being mounted between, and thus driven for rotation by, the driving and driven discs; the roller driving an axle forming a primary output shaft; and being axially moveable relative to the driving and driven discs so as to contact the driving and driven discs at a selected radial position, the speed of the primary output shaft thus being determined by the said selected radial position; and an epicyclic gear set comprising: a first input connected to the input shaft; a second input connected to the primary output shaft; and an output, the speed of the output being a function of the speeds of the first and second inputs.
  • the first inputs of the two or more epicyclic gear sets are connected to the input shaft and rotate at the same speed.
  • the second input of one of the output systems is connected to the primary output shaft via a reversing mechanism, such as an idler gear.
  • Figure 1 is a schematic diagram of a transmission in accordance with an embodiment of the invention
  • Figure 2 is substantially the same as Figure 1, but with the roller set at a different radial position;
  • FIG. 3 is a schematic diagram of a transaxle transmission in accordance with another embodiment of the invention.
  • Figures 4 and 5 are partial perspective views of an embodiment of a transmission as shown in Figure 3;
  • Figure 6 is partial perspective view of a 5-disc variant of a transmission in accordance with the invention.
  • a first embodiment of a transmission 10 in accordance with the invention comprises an input system 12 and an output system 14.
  • the input system 12 comprises a disc variator 16, which is driven for rotation, for example, by an internal combustion engine or an electric motor (not shown) via an input shaft 18.
  • the variator 16 has a driving disc 20 that is affixed to the input shaft 18 and a driven disc 22 that is mounted for rotation about the input shaft 18.
  • Means 24 for driving the driven disc 22 at the same speed, but in an opposite direction to, the driving disc 20 is also provided.
  • the means 24 for driving the driven disc at the same speed, but in an opposite direction to, the driving disc comprises a layshaft 26 having gears 28 at either end that engage with the outer diameters of the driving disc 20 and the driven disc 22.
  • the means 24 for driving the driven disc 22 at the same speed, but in an opposite direction to, the driving disc 20 comprises a bevel gear 30 that engages with corresponding bevel gear portions 29 formed on the outer diameters of the driving disc 20 and the driven disc 22.
  • the means 24 for driving the driven disc 22 at the same speed, but in an opposite direction to, the driving disc 20 comprises a set of idler rollers 32 that are interposed between the driving disc 20 and the driven disc 22.
  • the output system 14 comprises a roller 34 that is mounted between, and thus driven for rotation by, the driving 20 and driven discs 22. Traction fluid (not shown) is used to enable the roller 34 to be efficiently driven by the driving 20 and driven discs 22, and the roller 34 is clamped between the driving 20 and driven discs 22 by the application of an axial force 36 to the variator discs 20, 22.
  • the roller 34 is connected to, and drives, an axle 38 that forms a primary output shaft.
  • the roller 34 is axially moveable relative to the driving 20 and driven 22 discs' radii, so that is can be arranged to contact the driving 20 and driven 22 discs at a selected radial position 19.
  • the speed of the primary output shaft 38 is thus determined by the said selected radial position 19.
  • the transmission 10 further comprises an epicyclic gear set 40, which has a first input (the sun gear, in this example) 42 connected to the input shaft 18 via a set of bevel gears 44.
  • the epicyclic gear set 40 also has a second input (the ring gear, in this example) 46 connected to the primary output shaft 38 via a gear 48.
  • the speed of the primary output shaft 38 is determined by the radial position 19 of the roller 34 relative to the radii of the driving 20 and driven 22 discs, so the speed of the second input 46 of the epicyclic gear set 40 can be varied.
  • the output speed of an output shaft 50 of the epicyclic gear set 40 (in this example, connected to the planet gear carrier 52) being a function of the two input speeds 42, 46, as will be readily understood by the person skilled in the art. Therefore, the speed and/or direction 54 of the output shaft 50 can be varied by adjusting the radial position 19 of the roller 34 relative to the radii of the driving 20 and driven 22 discs.
  • FIG. 3 of the drawings shows a transaxle transmission 20 in accordance with the invention.
  • the two sets of rollers 34, 35 are independently axially moveable relative to the driving 20 and driven 22 discs' radii, so that is each set can be arranged to contact the driving 20 and driven 22 discs at a selected (the same or different) radial positions 19, 19'.
  • the speed of the primary output shafts 38, 39 are thus determined by the respective selected radial positions 19, 19'.
  • Each set of rollers 34, 35 is connected to its own epicyclic gear set 40, 41, and each epicyclic gear sets 40, 41 output shaft 50, 51 is connected to, in the illustrated example, a wheel 60, 62 of a vehicle.
  • the second epicyclic gear set 41 can be the same as the first 40, but in the illustrated example, it also comprises a reversing gear 43.
  • the transaxle transmission 20 can be used to provide not only IVT gearing, but also a differential by setting the contact points of the rollers 34, 35 at different radial positions relative to the driving 20 and driven discs 22.
  • transaxle transmission 20 of Figure 3 is shown in perspective view in Figures 4 and 5 of the drawings, and identical reference signs have been used to identify identical features respectively.
  • FIG. 6 of the drawings is a perspective view of another, 5-disc version, of the transaxle transmission 20 of Figures 3 to 5.
  • the axles 38 forming the primary output shafts are spline shafts, and that the rollers 34, 35 are mounted so that they can move axially along their respective spline shafts 38. Movement of the rollers 34, 35 relative to their respective spline shafts 38 is accomplished by a carriage 66 for each set of rollers 34, 35, which pushes them in either direction along their respective spline shaft 38.
  • the carriages 66 are displaced by a roller 68 that engages an angled slot 70 formed in a respective carriage shifter 72.
  • Each carriage shifter 72 is independently moved by an actuator 74, 76, such as a linear servo motor, a hydraulic ram, mechanical linkage or the like.
  • the input shaft 18 is typically connected to an internal combustion engine of an electric motor.
  • a mechanism may be interposed between the internal combustion engine/electric motor and the input shaft 18, which as the applied torque increases, so the axial force 36 applied to the variator discs 20, 22 is increased. This can be accomplished by a threaded connection or by way of a cam mechanism 80, which applies an increasing axial force to one of the discs 22, 22 as the torque applied to the input shaft 18 increases. This configuration reduces wear and losses when the transmission is not fully- loaded, whilst enabling the torque density to be increased as the applied torque increases.
  • the invention can be described as being a transmission (10) comprising a disc variator (16) and an epicyclic gear set (40) in which the input shaft (18) of the variator (16) is connected to a first input (42) of the epicyclic gear set (40), and in which, an output (38) of the variator (16) is connected to a second input (46) of the epicyclic gear set (40).
  • a transmission 10 comprising a disc variator (16) and an epicyclic gear set (40) in which the input shaft (18) of the variator (16) is connected to a first input (42) of the epicyclic gear set (40), and in which, an output (38) of the variator (16) is connected to a second input (46) of the epicyclic gear set (40).
  • the transmission (10) can be incorporated into a transaxle transmission (20), which has a variator (16) and two epicyclic gear sets (40, 41), the respective outputs (50, 51) of which can be used to independently control the speeds and/or directions of, for example, (60, 62) connected to the respective epicyclic gear sets' output shafts (50, 51).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Friction Gearing (AREA)

Abstract

L'invention concerne une transmission (10) comprenant un variateur à disque (16) et un train épicycloïdal (40), l'arbre d'entrée (18) du variateur (16) étant relié à une première entrée (42) du train épicycloïdal (40), et une sortie (38) du variateur (16) étant reliée à une seconde entrée (46) du train épicycloïdal (40). La modification du point de contact (19) d'un rouleau (34) du variateur (16) permet la variation des vitesses relatives des entrées (42, 46) du train épicycloïdal (40), afin d'obtenir une régulation infiniment variable de la vitesse et/ou de la direction d'une sortie (50) du train épicycloïdal (40). La transmission (10) peut être intégrée dans une transmission transaxe (20) comportant un variateur (16) et deux trains épicycloïdaux (40, 41), dont les sorties respectives (50, 51) peuvent être utilisés pour réguler indépendamment les vitesses et/ou les directions de, par exemple, des roues (60, 62) reliées aux arbres de sortie (50, 51) des trains épicycloïdaux respectifs.
PCT/GB2017/053279 2016-11-01 2017-11-01 Transmissions WO2018083458A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1618418.6 2016-11-01
GBGB1618418.6A GB201618418D0 (en) 2016-11-01 2016-11-01 Transmissions

Publications (1)

Publication Number Publication Date
WO2018083458A1 true WO2018083458A1 (fr) 2018-05-11

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GB (1) GB201618418D0 (fr)
WO (1) WO2018083458A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108194595A (zh) * 2018-01-25 2018-06-22 倍能科技（广州）有限公司 无级变速传动装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09229156A (ja) * 1996-01-20 1997-09-02 Minoru Nakagawa パワーローラースライド式・正逆切替え無段変速機
GB2527152A (en) * 2014-06-06 2015-12-16 Transfiniti Ltd Gearboxes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09229156A (ja) * 1996-01-20 1997-09-02 Minoru Nakagawa パワーローラースライド式・正逆切替え無段変速機
GB2527152A (en) * 2014-06-06 2015-12-16 Transfiniti Ltd Gearboxes

Also Published As

Publication number Publication date
GB201618418D0 (en) 2016-12-14

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