GB2173872A - Improvements in or relating to continuously-variable-ratio transmission units - Google Patents

Improvements in or relating to continuously-variable-ratio transmission units Download PDF

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Publication number
GB2173872A
GB2173872A GB08509674A GB8509674A GB2173872A GB 2173872 A GB2173872 A GB 2173872A GB 08509674 A GB08509674 A GB 08509674A GB 8509674 A GB8509674 A GB 8509674A GB 2173872 A GB2173872 A GB 2173872A
Authority
GB
United Kingdom
Prior art keywords
variator
transmission unit
gear train
lubricant
conduit
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.)
Withdrawn
Application number
GB08509674A
Other versions
GB8509674D0 (en
Inventor
Forbes George De Brie Perry
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB08509674A priority Critical patent/GB2173872A/en
Publication of GB8509674D0 publication Critical patent/GB8509674D0/en
Publication of GB2173872A publication Critical patent/GB2173872A/en
Withdrawn legal-status Critical Current

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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
    • F16H37/086—CVT using two coaxial friction members cooperating with at least one intermediate friction member
    • 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
    • F16H15/32—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 has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line
    • F16H15/36—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 has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface
    • F16H15/38—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 has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0487—Friction gearings
    • F16H57/049—Friction gearings of the toroid type

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

Abstract

An infinitely-variable ratio transmission unit comprising a toroidal race rolling traction unit 6 coupled to an epicyclic gear train 11 has gears 14,15 which perform the additional function of exercising a gear- pumping action to drive lubricant to another region of the unit. That region may be the ratio-varying unit 6 and the pumped lubricant may be delivered down a conduit 47 formed within the input shaft 4. The gear train is mounted within a casing member which acts so as to help direct lubricant, pumped by the intermesh action of the gears 14,15, into the conduit. <IMAGE>

Description

SPECIFICATION Improvements in or relating to continuously-variable-ratio transmission units This invention relates to continuously-variableratio transmission units. It relates in particular to automotive transmissions, and to units in which the ratio-varying component-or "varia tor' 'is of the toroidal race rolling traction type.
Such units typically comprise a variator, an epicyclic gear set, and reduction gearing arranged in succession. The output member of the reduction gearing constitutes the final drive of the transmission unit as a whole and in an automotive application is typically connected to the driven wheels of the vehicle, often by way of a differential. The purpose of the epicyclic gear set, different members of which will be connected respectively one to the output and another to the input of the variator, is to enable torque recirculation to take place within the unit.With this facility, and the appropriate choice of ratios within the epicyclic set, it becomes possible by a single continuous adjustment of the variator, from one extreme ratio to the other, to cause the final drive of the unit to change continuously from one extreme condition (e.g. full reverse) to the other (e.g. full forward) passing through a neutral condition in between.
According to the present invention, one of the essential components of such a transmission unit is arranged to fulfill the further and necessary task of ensuring a continuous and sufficient supply of lubricant to other parts of the unit. According to the invention an infintely variable ratio transmission unit comprises a variator and a gear train which in use rotates in contact with lubricant. A conduit for the passage of lubricant is provided between the region of the gear train and at least one other region of the unit requiring lubrication, and the train is adapted to exercise a gearpumping action so as to drive lubricant down that conduit. The unit may include an input shaft for the variator, and the conduit may include a bore formed within that shaft.
The regions of the unit to be lubricated may include the variator, which may be of the toroidal race rolling traction type.
The gear train may be mounted within a casing member whereby lubricant pumped by the intermesh of a pair of the gears is directed into the conduit.
The gear train may be located either before the variator or after it in the transmission path. Typically it may be after the variator and take the form of reduction gearing. The epicyclic gearing, different components of which may be connected respectively to the input and to the output of the variator, may be located between the variator and the reduction gearing and act with recirculation effect whereby a single continuous adjustment of the variator from one end of its ratio range to the other results in the output of the transmission unit passing continuously from a first to a second of two extreme conditions, one of those conditions being maximum forward transmitted speed and the other maximum reverse.
The epicyclic gearing may be arranged so that the sun is connected to the variator input, the planets are arranged in pairs mounted on a carrier connected to the variator output, and the annulus is connected to the input member of the gear train.
The invention will now be described by way of example, with reference to the accompanying drawings in which: Figure 1 is a partly schematic section through a transmission unit, taken in the common plane of the axes of the variator and of the final drive, and Figure 2 is a partial elevation of components associated with the pumping action, taken in the direction of the arrow II in Fig. 1.
A belt 1 transmits drive from a prime mover 2 to a pulley 3 mounted on the end of an input shaft 4 on which is mounted the input disc 5 of a variator 6 of the toroidal race rolling traction type. Three rollers 7, of which one is shown, transmit drive from disc 5 to the single output disc 8, the discs 5 and 8 being urged axially towards each other by appropriate end load mechanisms which are indicated schematically at 9 but which could be of several kinds all well known in the art. Disc 8 is connected to the carrier 10 of the planets of an epicyclic combination indicated in general at 11. The sun 12 of the combination is carried on shaft 4 and the annulus 13 is connected to the input gear 14 of a gear train in the form of torque-reducing pair, the output gear 15 of which is connected to output shafts 16 and 17.Each of those shafts is connected, by reduction gearing indicated in outline at 18 and 19, to one of the driven road wheels 20 of a vehicle.
By the use of known means (not shown) to turn the mountings of rollers 7 about axes 21 which lie perpendicular to the plane of the section, and by appropriate choice of the components and ratios of epicyclic combination 11, it may be arranged that a continuous turn of the mounting of the rollers 7, from one extreme of their angular range to the other, results in a corresponding and continuous change in the motion of output gear 15 from one extreme condition (e.g. maximum reverse speed) to the other (e.g. maximum forward speed), passing through a neutral condition in between.The extreme angular setting of the roller 7 indicated at 7a in Fig. 1 corresponds with maximum reverse speed of output 15, setting 7b with maximum forward, and setting 7c with the "neutral" condition in between in which the resultant of the contrary motions of the carrier 10 and of the sun 12 is zero motion of annulus 13 and thus of output gear 15.
Gears 14 and 15 rotate within interfitting casing members 41 and 42, so shaped as to allow a gear pumping action to be exerted upon lubricating oil approaching the intermesh of the gears at 43. The pumped oil passes by way of a spout 44 (formed on member 41) into a conduit 45 the free end of which is blocked by a ball seal 48. From conduit 45 the pumped oil passes by way of radial drillings 46 into a central bore 47 formed within shaft 4. From this bore the pumped oil passes in turn, by way of further radial drillings, into contact with various of the elements of the transmission which require lubrication. Thus drillings 49-52 lead respectively towards the bearing of gear 14 upon shaft 4, the sun 12, the variator components, and an end main bearing of shaft 4.

Claims (7)

1. An infinitely-variable ratio transmission unit comprising a variator-that is to say, a ratio-varying component-and a gear train which in use rotates in contact with lubricant, in which a conduit for the passage of lubricant is provided between the region of the gear train and at least one other region of the unit requiring lubrication, and in which the gear train is adapted to exercise a gear-pumping action so as to drive lubricant down that conduit.
2. A transmission unit according to Claim 1 including an input shaft for the variator, and in which the conduit includes a bore formed within that shaft.
3. A transmission unit according to Claim 2 in which the regions of the unit to be lubricated include the variator.
4. A transmission unit according to Claim 1 in which the variator is of the toroidal race rolling traction type.
5. A transmission unit according to Claim 1 in which the gear train is located after the variator in the transmission path and in which epicyclic gearing, different components of which are connected respectively to the input and to the output of the variator, is located between the variator and the gear train and acts with recirculation effect whereby a single continuous adjustment of the variator from one end of its ratio range to the other results in the output of the transmission unit passing continuously from a first to a second of two extreme conditions, one of those conditions being maximum forward transmitted speed and the other maximum reverse.
6. A transmission unit according to Claim 1 in which the gear train is mounted within a casing member whereby lubricant pumped by the intermesh of a pair of the gears is directed into the conduit.
7. A transmission unit according to Claim 5 in which the sun of the epicyclic gearing is connected to the variator input, the planets are arranged in pairs mounted on a carrier connected to the variator output, and the annulus is connected to the input member of the gear train.
GB08509674A 1985-04-16 1985-04-16 Improvements in or relating to continuously-variable-ratio transmission units Withdrawn GB2173872A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08509674A GB2173872A (en) 1985-04-16 1985-04-16 Improvements in or relating to continuously-variable-ratio transmission units

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08509674A GB2173872A (en) 1985-04-16 1985-04-16 Improvements in or relating to continuously-variable-ratio transmission units

Publications (2)

Publication Number Publication Date
GB8509674D0 GB8509674D0 (en) 1985-05-22
GB2173872A true GB2173872A (en) 1986-10-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08509674A Withdrawn GB2173872A (en) 1985-04-16 1985-04-16 Improvements in or relating to continuously-variable-ratio transmission units

Country Status (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2325966A (en) * 1997-05-16 1998-12-09 Jatco Corp Lubricating structure of a toroidal transmission
GB2336880B (en) * 1998-04-20 2001-11-21 Lin Pan Chien Power transmission apparatus
DE19836558C2 (en) * 1997-08-12 2003-03-13 Nsk Ltd Infinitely adjustable toroidal gear system
GB2413368A (en) * 2001-07-05 2005-10-26 Daimler Chrysler Ag Planet carrier connected to traction wheel via bearing pin

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB634298A (en) * 1946-01-12 1950-03-15 British Leyland Motor Corp Improvements in and relating to change-speed gears
GB1296827A (en) * 1968-12-06 1972-11-22
GB1482116A (en) * 1973-08-06 1977-08-03 Eaton Corp Axle lubrication system
GB2007784A (en) * 1977-11-15 1979-05-23 Toyota Motor Co Ltd Transmission units
GB2019962A (en) * 1978-04-27 1979-11-07 Gen Motors Corp Transmissions having a lubrication system
GB1592448A (en) * 1977-11-25 1981-07-08 Lamburn A S Change speed gearing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB634298A (en) * 1946-01-12 1950-03-15 British Leyland Motor Corp Improvements in and relating to change-speed gears
GB1296827A (en) * 1968-12-06 1972-11-22
GB1482116A (en) * 1973-08-06 1977-08-03 Eaton Corp Axle lubrication system
GB2007784A (en) * 1977-11-15 1979-05-23 Toyota Motor Co Ltd Transmission units
GB1592448A (en) * 1977-11-25 1981-07-08 Lamburn A S Change speed gearing
GB2019962A (en) * 1978-04-27 1979-11-07 Gen Motors Corp Transmissions having a lubrication system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2325966A (en) * 1997-05-16 1998-12-09 Jatco Corp Lubricating structure of a toroidal transmission
US6110070A (en) * 1997-05-16 2000-08-29 Jatco Corporation Lubricating structure of transmission
GB2325966B (en) * 1997-05-16 2001-12-12 Jatco Corp Lubricating structure of transmission
DE19836558C2 (en) * 1997-08-12 2003-03-13 Nsk Ltd Infinitely adjustable toroidal gear system
GB2336880B (en) * 1998-04-20 2001-11-21 Lin Pan Chien Power transmission apparatus
GB2413368A (en) * 2001-07-05 2005-10-26 Daimler Chrysler Ag Planet carrier connected to traction wheel via bearing pin

Also Published As

Publication number Publication date
GB8509674D0 (en) 1985-05-22

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)