WO2013142368A1 - Locking continuously variable transmission (cvt) - Google Patents

Locking continuously variable transmission (cvt) Download PDF

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Publication number
WO2013142368A1
WO2013142368A1 PCT/US2013/032461 US2013032461W WO2013142368A1 WO 2013142368 A1 WO2013142368 A1 WO 2013142368A1 US 2013032461 W US2013032461 W US 2013032461W WO 2013142368 A1 WO2013142368 A1 WO 2013142368A1
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WO
WIPO (PCT)
Prior art keywords
transmission
sheave
chain
gear
gears
Prior art date
Application number
PCT/US2013/032461
Other languages
English (en)
French (fr)
Inventor
Gary D. Lee
William M. Decker
Eric E. Aston
Steven APOSHIAN
Brian BARNUM
Regis David
Isaac JONES
Andrew Orme
Original Assignee
Vmt Technologies, Llc
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
Priority claimed from US13/427,354 external-priority patent/US20120238384A1/en
Application filed by Vmt Technologies, Llc filed Critical Vmt Technologies, Llc
Priority to EP13764640.2A priority Critical patent/EP2828553A1/de
Publication of WO2013142368A1 publication Critical patent/WO2013142368A1/en
Priority to US14/198,535 priority patent/US20140248981A1/en

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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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/52—Pulleys or friction discs of adjustable construction
    • F16H55/54—Pulleys or friction discs of adjustable construction of which the bearing parts are radially adjustable
    • 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
    • F16H37/04—Combinations of toothed gearings only

Definitions

  • the present application relates to the field of transmission systems and related processes and components. More particularly, the present invention relates to methods, systems, sub-systems, assemblies, and components for providing substantially constant engagement during power transmission, and during changes of a relatively large number of gear ratios in relatively small increments.
  • Related Technology relates to the field of transmission systems and related processes and components. More particularly, the present invention relates to methods, systems, sub-systems, assemblies, and components for providing substantially constant engagement during power transmission, and during changes of a relatively large number of gear ratios in relatively small increments.
  • Disclosed embodiments are generally concerned with transmission systems and associated components and systems. Embodiments within the scope of this disclosure may include aspects of the present disclosure together with any one or more of the following elements, and features of elements, in any combination: a group of one or more drive members, each of which is configured to selectively engage a driven member; a group of one or more drive members which are configured to successively engage, a driven member; a group of one or more drive members which are rotatable about a common axis; a group of one or more drive members, each of which is configured to rotate about its own axis; a group of one or more drive members, each of which is configured to rotate about its own axis, and the drive members are further configured to rotate about a common axis; a group of one or more drive members, each of which is configured to move radially relative to a common axis; a group of one or more drive members, each of which is configured to move radially relative to a common axis, and each of the drive members is further
  • a transmission in a first example embodiment, includes a sheave of selectively variable configuration, a driven member configured to engage the sheave, and a plurality of drive members configured for radial movement to selectively engage the driven member.
  • the transmission may be operable in one or more of the following modes: traction mode, integer mode, IN mode, and infinite mode.
  • the transmission of the first example embodiment may further include an indexing mechanism configured to adjust a position of a drive member relative to the driven member when the drive member is not engaged with the driven member.
  • a method for operating the transmission of either of the first and second embodiments includes initiating a shift cycle, adjusting sheave spacing to correspond to a desired drive ratio, and adjusting driven member tension during sheave spacing adjustments so as to maintain a desired driven member slip rate.
  • a method for operating the transmission of either of the first and second embodiments includes initiating a shift cycle, disengaging the drive members from the driven member, adjusting sheave spacing to correspond to a desired drive ratio, adjusting an index position of the drive members such that the drive members engage the driven member in a predetermined fashion, engaging the drive members with the driven member, and maintaining a desired slack side driven member tension.
  • a method for operating the transmission of either of the first and second embodiments includes initiating a shift cycle, disengaging the drive members from the driven member, adjusting sheave spacing to correspond to a desired drive ratio, controlling a relative position of the driven member with respect to an index line of the drive members by adjusting power of an engine operably coupled to the transmission of either the first or second embodiments and the driven member tension, engaging the drive members with the driven member, and maintaining a desired slack side driven member tension.
  • the method of the fourth or fifth example embodiments further includes maintaining an index position of each drive member until another shift cycle is initiated.
  • a vehicle in a seventh example embodiment, includes the transmission of either the first or second embodiments, as well as an engine configured to be coupled directly or indirectly to the transmission, and a control system configured to control one or more aspects of the operation of the transmission.
  • the drive member may comprise a gear, such as a moon gear, or a sector gear
  • the driven member may comprise a chain or belt.
  • Figures 1A-1G illustrate various views of one example embodiment of an infinitely variable transmission
  • Figures 2A and 2B illustrate alternative views of the infinitely variable transmission of Figures 1A-1G, in which various components have been removed so as to illustrate interior components of the transmission;
  • Figures 3A and 3B also illustrate alternative views of the infinitely variable transmission of Figures 1A-1G, with various other components having been removed to illustrate still other interior components of the transmission;
  • Figures 4A-4C illustrate a transmission with a reverse differential that may provide an engaged neutral and is usable with the transmission of Figures 1A-1G;
  • FIGS. 5A-5C illustrate an alternative embodiment of a transmission according to some aspects of the present invention
  • Figure 6 illustrates an example transmission according to embodiments of the present invention, and includes a chain tensioner for adjusting the slack in a chain mounted to a sheave;
  • Figure 7A illustrates an isometric view of a sheave assembly usable with embodiments of a transmission as described herein;
  • Figure 7B illustrates a side view of the sheave assembly of Figure 7A
  • Figure 7C illustrates a cut-away view of the sheave assembly of Figure 7B;
  • Figure 7D illustrates further aspects of an example sheave assembly;
  • Figures 8A and 8B illustrate additional views of a transmission having a sheave assembly similar to that in Figures 7A-7D;
  • Figure 9 schematically illustrates one example embodiment of a transmission having a gear position correction mechanism
  • Figures 10A-10F illustrate various views of a transmission having a gear position correction mechanism and a gear locking mechanism
  • Figures 11A-1 1E illustrate another example embodiment of a transmission having a gear position correction mechanism, gear locking mechanism, and gear ratio change mechanism
  • Figure 12 is a schematic illustration of various aspects of moon gears engaged with a chain that is engaged with a variator
  • Figure 13 is a schematic illustration of various aspects of moon gears disengage from a chain that is engaged with a variator
  • Figure 14 is a schematic illustration demonstrating the relation between variator width and operating diameter; and Figure 15 is a schematic illustration indicating the role of a chain tensioner.
  • Figure 16 is a schematic illustration that discloses aspects of an example sector gear mechanism
  • Figure 17 is a cross-section view that discloses aspects of an example sector gear mechanism and associated variator device
  • Figure 18 is a perspective view that discloses aspects of an example sector gear mechanism
  • Figure 19 includes a number of views depicting aspects of a modification to some of the concepts disclosed in Figures 16-18;
  • Figure 20 is a perspective view of an adjustable idler/tensioner assembly
  • Figure 21 is an end view of the device of figure 20;
  • Figure 22 is a schematic of an example control system that may be employed in connection with the devices of Figures 20 and 21;
  • Figure 23 discloses aspects of a chain according to some example embodiments.
  • Figure 24 discloses aspects of a sector gear and associated sled
  • Figure 25 discloses further aspects of a chain according to some example embodiments.
  • This description relates to transmission systems and associated components and systems. More particularly, the description herein relates to transmission systems that can convey power from a source to a load using gear ratios that are changeable in very small, perhaps infinitely small, increments. More particularly still, the description relates to transmission systems usable with any of a variety of technologies, and which can operate with an engaged neutral and move in very small, perhaps infinitely small, increments either forward or reverse out of the engaged neutral.
  • embodiments disclosed herein may, in some applications, be employed in connection with a sprocket correction mechanism (examples of which are disclosed in United States Provisional Patent Application No. 61/378,875, filed on August 31, 2010, entitled INFINITELY VARIABLE TRANSMISSION WITH SPROCKET CORRECTION MECHANISM) and/or with a driven member, such as a chain (examples of which are disclosed in United States Provisional Application Serial No. 61/307,380, filed on February 23, 2010, entitled CHAIN FOR INFiNTELY VARIABLE TRANSMISSION).
  • a sprocket correction mechanism examples of which are disclosed in United States Provisional Patent Application No. 61/378,875, filed on August 31, 2010, entitled INFINITELY VARIABLE TRANSMISSION WITH SPROCKET CORRECTION MECHANISM
  • a driven member such as a chain
  • inventions disclosed herein may be employed in any vehicle or application whose operation involves the need to transmit power from a source or prime mover to other component(s) and/or system(s).
  • vehicles include vehicles configured to operate in and/or on one or more of the following environments: land, water, and air. Further details concerning some example operating environments for the disclosed embodiments are set forth below.
  • Continuously Variable Transmission A ratio changing machine that allows any speed relationship between the input and the output.
  • the system may be mechanical, electric, hydraulic, or pneumatic.
  • the CVT embraces, at least, a variable sheave type mechanical CVT.
  • a device can take the form of a sheave whose width can be dynamically adjusted. Adjustment of the sheave width results in a corresponding dynamic change to the operating diameter of the sheave. That is, the diameter of the sheave can be dynamically changed while an associated driven member, such as a chain or a belt for example, is moving around the sheave.
  • the driven member has a fixed width.
  • a drive member such as a sector gear for example, can be configured with substantially the same width as the chain it drives, or is driven by. Any other component(s) having functionality comparable to such a sheave may alternatively be employed in at least some embodiments of the invention.
  • Traction Drive A mechanical CVT where the variator translates torque into tension of a driven member, such as a chain or belt for example, primarily through a friction interface between the variator and the driven member.
  • Moon gear A gear element of a mechanical gear train that is operable to engage a driving or driven member, such as a chain for example, whilst simultaneously orbiting around a center of rotation that is eccentric with the axis of rotation of the gear element.
  • a moon gear that may be employed in some embodiments is a sector gear, examples of which are disclosed in United States Provisional Patent Application Ser. 61/471,009, entitled SECTOR GEAR ENGAGEMENT DRIVE, filed April 1, 2011 ; United States Provisional Patent Application Ser. 61/480,200, entitled SECTOR GEAR ENGAGEMENT DRIVE, filed April 28, 2011 ; and, United States Provisional Patent Application Ser. 61/568,364, entitled SECTOR GEAR ENGAGEMENT DRIVE AND ADJUSTABLE IDLER/TENSIONER, filed December 8, 2011.
  • Index Line A radial line defined by the axis of rotation of the moon gear and the axis of rotation of the variator.
  • Index Position The angular position of the moon gears with respect to the index line that ensures proper meshing with the chain at the relative position of the chain with respect to the variator.
  • Drive Ratio A relationship between, for example, a sheave type variator and a driven member such as a chain where, during the course of one revolution of the variator, the variator will engage a certain number of chain links, the drive ratio being expressed in terms of the number of links thus engaged.
  • the variator takes the form of a sprocket or gear, for example, the drive ratio would correspond to the effective number of teeth. For example, if the chain advances 46.57 links per revolution of the variator, then the drive ratio of the variator would be 46.57.
  • Integer ratio A drive ratio having a whole, i.e., integer, number of links. For example, 48, 49 or 50.
  • IN ratio An integer drive ratio where the number of links engaged during the course of one revolution of the variator is wholly divisible by the number of moon gears.
  • the moon gears When a system is operating at an I ratio, the moon gears will all be oriented to the same relative angular position with respect to the index line. If there were two, three, four or "N" moon gears for example, then the IN ratio would be noted as , , or I N .
  • I N For example, when using an I 3 system, if the lowest integer ratio is 48 links and the greatest is 75, then there are ten I 3 ratios available in the span of the variator, namely, 48, 51, 54, 57, 60, 63, 66, 69, 72 and 75.
  • 48 is the number of links that are engaged by the variator per revolution when the sheave diameter is at a minimum
  • 75 is the number of links engaged by the variator per revolution when the sheave diameter is at a maximum.
  • transmission 10 is truly an infinitely variable transmission and not merely a continuously variable transmission.
  • the ability to start from a zero velocity and move to higher output speeds in infinite increments without disconnection can provide various desired results. For example, heavy machinery or equipment may sit idle on an incline. By changing gear ratios in infinitely small increments, torque spikes may be managed.
  • the illustrated transmission 10 further has the capability of operating at a constant velocity— even at neutral— thereby further providing management of torque spikes and facilitating movement of heavy equipment, small automobiles, electric cars, scooters, wind-powered electricity generating devices, and effectively any type of equipment or device in which gear ratio and/or output speed changes are desired.
  • transmission 10 may also include a differential system 90 that, for example, can provide the ability to operate at an engaged neutral and thereby provide infinite gear ratio changes and infinite output speed changes, directly from zero output velocity.
  • a simplified version of transmission 10 is provided in Figures 5A-5C, and shows a similar transmission 100 with various components removed for clarity. Such a description further provides a description of a torque flow path through transmission 100.
  • the torque flow path for transmission 10 in Figures 1A-1G is similar or identical in various respects, although transmissions 10 and 100 can be varied as necessary for a particular application.
  • the torque flow path begins as a power input is received at transmission input 12 and is conveyed through input system 11. As transmission input 12 receives the power input, it causes an input gear
  • input gear 13 therefore causes the received input power to be divided along two separate paths.
  • input gear 13 is engaged with two additional gears, namely linking gear 14 and transfer gear 92.
  • linking gear 14 is engaged with two additional gears, namely linking gear 14 and transfer gear 92.
  • Transfer gear 92 sends power input received at input 12 through differential system 90, which is described in greater detail hereafter.
  • linking gear 14 is coupled to input shaft 16 such that input shaft 16 rotates as linking gear 14 rotates.
  • a sheave Positioned on input shaft 16 is a sheave that is composed of first and second sheave halves 17, 18.
  • the connection between input shaft 16 and linking gear 14 and sheave halves 17, 18 may be, for example, a splined connection.
  • linking gear 14 and/or sheave halves 17, 18 may be connected in other manners.
  • one of sheave halves 17, 18 may be welded or integrally formed with input shaft 16. In this manner, a single one of sheave halve 17, 18 may be movable along shaft 16, although it is not necessary that either of sheave halves 17, 18 be movable.
  • linking gear 14 or sheave halves 17, 18 may be directly or indirectly coupled to input shaft 16 by way of one or more other gears and/or linkages.
  • sheave halves 17, 18 may also be rotated. In this manner, power is transferred through input system to sheave halves 17, 18.
  • Sheave halves 17, 18 operate as one driving mechanism for conveying power from input system 11 to output system 70.
  • chain 50 is positioned between sheave halves 17, 18 and frictionally engages sheave halves 17, 18. Accordingly, as sheave halves 17, 18 rotate, chain 50 also rotates. Further, chain 50 is connected to output system 70 so as to convey power from input system 1 1 to output system 70.
  • output system 70 also includes a sheave that has two sheave halves 71, 72 that frictionally engage chain 50.
  • sheave halves 71, 72 are also connected to an output shaft 73. As a result, as sheave halves 71, 72 are rotated by chain 50, output shaft 73 also rotates and provides an output at a particular gear ratio relative to the power input at transmission input 12.
  • chain 50 may be at different heights on the sheaves represented in input system 1 1 and output system 70.
  • chain 50 is positioned near an external surface of sheave halves 71, 72, but is at a much more interior position on sheave halves 17, 18. This is, of course, merely exemplary, however, and can be varied as necessary to suit any particular application.
  • sheave halves 17, 18 are configured to move inward (i.e., toward each other along an axis defined by shaft 16) and outward (i.e., away from each other along the axis defined by shaft 16), such that chain 50 can also move radially inward (i.e., toward input shaft 16) and radially outward (i.e., away from input shaft 16).
  • chain 50 moves in this manner, the gear ratio within transmission 10 can be changed.
  • sheave halves 17, 18 each have an angled interior surface.
  • chain 50 can be positioned against such angled interior surfaces, and chain 50 may also be made of one or more links that have angled outer surfaces generally corresponding to the angle on sheave halves 17, 18.
  • the power transmission component that transfers power from input system 11 to output system 70 is described herein as a chain, in other embodiments it may instead be a belt, or other member.
  • sheave halves 17, 18 in-and-out thus provides a range of gear ratios to transmission 10.
  • sheave halves 71, 72 may be fixed.
  • sheave halves 71, 72 may also be configured to move inward and outward. Indeed, by having the sheaves on input system 11 and output system 70 both move in and out, an even greater range of ratios can be provided.
  • the range of gear ratios provided can also be modified based on other parameters in transmission 10. For example, the angle of sheave halves 17, 18 and/or the angle on sheave halves 71, 72 can be varied from one embodiment to the next.
  • chain 50 when sheave halves 17, 18 move closer together or further apart a specific distance, chain 50 will move radially outward or inward in a plane perpendicular to shaft 16.
  • the distance chain moves radially will, however, be different in embodiments that have different angles on sheave halves 17, 18. For instance, for a specific distance sheave halves 17, 18 are moved, a steeper angle on the sheave halves 17, 18 can cause chain 50 to move a greater distance than would an embodiment that has sheave halves 17, 18 with a lesser angle.
  • the width of chain 50 can also be varied as a wider chain 50 may allow for a greater range of ratios.
  • sheave spacing actuator 19 is provided for each of sheave halves 17, 18 (and corresponding sheave spacing actuators 74 are also provided for each of sheave halves 71, 72).
  • Sheave spacing actuators 19, 74 may be any suitable device that can facilitate inward and outward movement of sheave halves 17, 18, 71, 72.
  • sheave spacing actuators 19, 74 include hydraulic or pneumatic pistons that are journaled around shafts 16, 73.
  • sheave spacing actuator 19 and/or sheave spacing actuator 74 can be activated to exert a force on a portion of a sheave and thereby move sheave halves 17, 18 and/or 71, 72 together, or to reduce an exerted force, thereby allowing sheave halves to separate.
  • a worm gear may be used to advance a compression plate.
  • the worm gear may be actuated by an electronic, mechanical, or electro-mechanical device, and can advance the compression plate to cause a sheave to compress inward, or can be used to back-off the compression plate to cause or allow one or both of the sheave halves to move outward.
  • a stepping motor may be used as the actuator 19.
  • the sheave control mechanism e.g., actuators 19, 74
  • the sheaves may operate in connection with a tensioning device such that chain 50 follows the spreading sheave to a smaller or larger diameter.
  • the second sheave can act as the tensioning device. With such tensioning, when the sheave halves move towards each other, chain 50 effectively climbs outward on the sheave. The angle at which chain 50 climbs outward can be dependent on the sheave as it will follow along the angle on the interior surface of the sheave.
  • Figures 2A and 2B a closer look at the interior of sheave halves 17, 18 is provided. Specifically, Figures 2A and 2B illustrated transmission 10 of Figures 1A-1G, but with transmission 10 having sheave half 17 and sheave spacing actuator 19 removed, along with various other elements, so as to provide a clear view at the interior of the sheave.
  • chain 50 engages sheave half 18, as well as a plurality of sprockets 20 that are spaced around a central, longitudinal axis of sheave halves 17, 18.
  • Sprockets 20 have a plurality of teeth that are configured to mate with chain 50 and to mesh therewith.
  • the illustrated embodiment includes three sprockets 20 that are linked to shaft 16, such that when shaft 16 rotates, sprockets 20 orbit around shaft 16. In so doing, each of sprockets 20 will alternately engage chain 50.
  • sprockets 20 may be angularly spaced at approximately one- hundred twenty degree intervals. When one sprocket 20 orbits to a position that approximately coincides with a portion where chain 50 first engages sheave halves 17, 18, the sprocket 20 may engage chain 50. Such a sprocket 20 can then remain engaged through a portion of its orbital path, and then can disengage at approximately where chain 50 disengages from sheave halves 17, 18. It should be appreciated that the angular interval over which sprockets 20 remain engaged with chain 50 can vary based on the specific design of transmission 10.
  • each of sprockets 20 may remain engaged for an angular interval of approximately one-hundred eighty degrees, however other intervals are contemplated (e.g., intervals varying from about one -twenty degrees to about two-hundred forty degrees).
  • chain 50 can engage not only sprockets 20 but also sheave halves 17, 18, in other embodiments chain 50 may engage only sprockets 20, or sprockets 20 may be removed so that chain 50 only engages sheave halves 17, 18.
  • sheave halves 17, 18 could potentially be eliminated entirely.
  • chain idlers could be used in concert with chain tensioning devices to keep the engaging and disengaging angles of the chain constant.
  • At least one sprocket 20 can remain in mesh with chain 50 at all times as chain 50 moves around sheaves 17, 18, although it need not be the same sprocket 20 at all times. Further, as will be appreciated in view of the disclosure herein, more than one of sprockets 20 may be engaged at the same time, For example, in the embodiment in Figures 2A and 2B, two of sprockets 20 are engaged with chain 50 at the same time.
  • sprockets there may be more or fewer sprockets in some embodiments. For example, an embodiment is contemplated in which four sprockets are used, and up to three of such sprockets may be all engaged with the chain at the same time. Of course five or more sprockets may also be used, with varying configurations to allow for one or more than one sprocket to be engaged with the chain at the same time.
  • sprockets 20 and sheave halves 17, 18 be utilized together in all embodiments, the use of sprockets 20 with sheave halves 17, 18 to drive chain 50 provides various features that may be desirable in various different applications.
  • other transmission systems may employ a belt drive that operates around a sheave.
  • Such systems rely on frictional engagement between the belt and sheave to operate.
  • such transmissions have a certain amount of slip that occurs between the sheave and the belt. This leads to inefficiencies in the system.
  • the addition of sprockets 20 between sheave halves 17, 18 can eliminate or at least significantly reduce the slippage between chain 50 and sheave halves 17, 18.
  • sprockets 20 may be connected to a braking system that creates a brake when sprockets 20 are under load (e.g., when sprockets 20 are in mesh with chain 50), so as to resist rotating due to slippage.
  • a braking system may use a worm gear as discussed hereafter.
  • a belt-system that relies entirely on friction between the belt and sheaves has not been shown to be suitable for high torque applications.
  • a belt may be made of a polymeric material that operates between two sheaves. The higher the torque, the more friction is created. If a large amount of torque is thus applied so that there is a significant torque spike, the frictional creates a large amount of heat that will burn through the polymeric belt. Even if such polymeric materials are combined with composites, metals, and the like, the high heat creates wear on the belt that significantly reduces its useful life. Furthermore, if the polymeric material is replaced with full metal materials, there may be better properties for heat resistance and possibly for heat generation; however, the metal-to-metal contact can result in increased slippage.
  • the invention described herein may be used in any of the scenarios or embodiments disclosed herein, and can include embodiments in which sprockets 20 are eliminated, so that sheave halves 17, 18 operate as a friction-based system with polymeric, metal, composite, or other belt and sheave materials. Additionally, however, when sprockets 20 are added and used with sheave halves 17, 18, various desirable characteristics can be obtained. For example, even if chain 50 is made of a material that is prone to slippage, sprockets 20 can engage chain 50 and cause chain 50 to continue to rotate around sheave halves 17, 18. Thus, sprockets 20 can operate as an additional drive that may not only reduce slippage, but can also provide an additional input so that friction between chain 50 and sheaves 17, 18 is reduced.
  • sprockets 20 are illustrated in Figures 2A and 2B as being used in connection with sheave halve 17, 18 a similar or identical system may also be used in connection with, or in lieu of, sheave halves 71, 72 of output system 70.
  • chain 50 may engage sheave halves 17, 18 and orbit therearound, but the diameter of such orbit may be changed as sheave halves 17, 18 move inward and outward, thereby also causing chain 50 to move inward and outward.
  • sprockets 20 may thus engage at one position of chain 50, but if chain 50 moves outward from the position illustrated in Figures 2A and 2B, sprockets 20 may no longer engage chain 50.
  • sheave halves 17, 18 and chain 50 are described herein as being in frictional engagement, in other embodiments it is not necessary that any significant dynamic friction be present.
  • chain 50 and/or sheave halves 17, 18 may be lubricated in such a manner that chain 50 effectively floats around sheave halves 17, 18.
  • Such effectively frictionless engagement may occur as a result of the addition of oil or another lubricant to the system.
  • chain 50 may have an O-ring attached to the links of chain 50.
  • Such an O-ring may trap a lubricant for a time while placed under compression due to the interface of chain 50 and sheave halves 17, 18.
  • the lubricant may create an essentially frictionless surface on which chain 50 can roll for the 60th of a second or so needed to for the particular chain link to enter and exit from engagement with sheave halves 17, 18.
  • chain 50 may be connected to a sheave of one system (e.g., input or output system), and to one or more sprockets in the opposing system. As such a sheave causes chain 50 to move, chain 50 can still remain engaged with one or more sprockets on an opposing system. With a chain tensioner, chain 50 may thus remain positively engaged and in mesh with a sprocket that prevents slippage along the length of chain 50.
  • a sheave causes chain 50 to move
  • chain 50 can still remain engaged with one or more sprockets on an opposing system.
  • chain tensioner chain 50 may thus remain positively engaged and in mesh with a sprocket that prevents slippage along the length of chain 50.
  • sprockets 20 may themselves move inward and outward, so that they can remain engaged with chain 50 as chain 50 moves inward and/or outward relative to shaft 16.
  • One suitable mechanism for moving sprockets 20 so that they remain in constant engagement with chain 50 is illustrated in Figures 2A and 2B.
  • Figures 2A and 2B have various components removed to better illustrate internal components of transmission 10 and input system 11 , reference will now be made to various components of output system 70. However, it should be appreciated that the same or similar components are employed on input system 11, but are merely removed in the illustrated embodiment for purposes of clarity.
  • a pair of adjustment actuators 21 are disclosed. Each adjustment actuator 21 is coupled to sheave half 71, but a similar set of adjustment actuators 21 could be found connected to sheave half 17 ( Figure 1A). As sheave halves 71, 72 move inward or outward, thereby also causing chain 50 to move, actuators 21 can be activated. Actuators 21 have an arm 22 coupled to an adjustment ring 23. Arm 22 can be selectively moved inward or outward. As it moves in such a manner, it causes ring 23 to rotate. For example, outward motion of arms 22 can cause ring 23 to move in a clockwise motion, whereas inward motion of arms 22 can cause ring 23 to move in a counterclockwise motion. Such directions and motions, as well as the operation of actuators 21, are merely exemplary.
  • each housing 24 Connected to ring 23 are three housings 24 that are spaced at one-hundred twenty degree intervals, and correspond generally to the placement of sprockets 20.
  • each housing 24 Within each housing 24 is an adjustment gear 25 that meshes with gear teeth on the interior of ring 23.
  • Each gear 25 is, in turn, coupled to a shaft 26 that extends inward, toward a respective sprocket 20.
  • an arm 27 On the distal end of shaft 26 is an arm 27 that connects to one of sprockets 20.
  • Such features when combined, provide one mechanism that can be used to selectively move sprockets 20 radially inward and outward. Moreover, when such movement is coordinated with the movement of sheave halves 17, 18, it allows sprockets 20 to remain engaged with chain 50 at various radial positions of chain 50, and even throughout changes from one position to another. As a result, the mechanism provides constant, positive engagement between chain 50 and sprockets 20 at not only discrete ratios, but throughout movement from one discrete ratio to another. Thus, chain 50 and sprockets 50 are positively engaged through infinitely small gear ratio changes, and thus through an infinite range of ratios.
  • transmission 10 not only has constant frictional engagement (e.g., between chain 50 and sheave halves 17, 18 and 71, 72), but there is constant positive engagement (e.g., between chain 50 and sprockets 20) over an infinite range of ratios.
  • arms 27 and sprockets 20 are configured such that the rotation of arms 27 will move sprockets 20 along a curved path from an innermost position to an outermost position, in infinitely small increments. In this manner, selective activation of actuators 21, can thereby cause sprockets 20 to move inward or outward with the movement of sheave halves 17, 18 and thus facilitates constant engagement between teeth of sprockets 20 and openings of chain 50.
  • the non-integer tooth problem is that as mating gears each move outward in infinitely small increments, there are only certain, discrete points along that path in which the path is equally divisible by the involute tooth profile of the gear teeth.
  • the non-integer tooth problem is similar in that as a chain moves outward in infinitely small increments, there are only certain, discrete points along that path in which the path is equally divisible by the profile of the sprocket teeth.
  • Transmission 10 as illustrated and described herein, however, can include a correction mechanism that allows for efficient correction of the teeth of sprockets 20.
  • the teeth of sprockets 20 can be corrected as necessary so as to maintain proper engagement at integer and non-integer locations.
  • transmission 10 in Figures 3A and 3B is illustrated with various components removed so as to provide a better view of an interior of transmission 10.
  • transmission 10 in Figures 3 A and 3B is identical to that in Figures 1A-1G, but is illustrated without differential system 90, sheave spacing actuators 19, 74 and sheave half 18.
  • indexing actuators 28 are illustrated as a part of input system 11. Each of indexing actuators 28 can be selectively activated so as to correct a corresponding sprocket, as necessary.
  • actuators 28 are each connected to a worm gear 29, and worm gear 29 is maintained in mesh with an indexing gear 30.
  • actuator 28 rotates worm gear 29.
  • worm gear 29 is maintained in mesh with indexing gear 30
  • rotation of worm gear also causes indexing gear 30 to rotate.
  • Indexing gear 30 may be mounted on an indexing shaft (not shown) which, in this embodiment, runs through a tube 31 that in turn connects to arm 27.
  • an indexing drive gear 32 that is mounted to the indexing shaft.
  • Indexing drive gear 32 is also in mesh with sprocket 20.
  • sprockets 20 can be indexed to remain in alignment both at interval and non-interval locations of chain 50.
  • worm gear 29 may cause indexing gear 30 to rotate.
  • Such rotation causes indexing shaft and indexing drive gear 32 to rotate.
  • indexing drive gear 32 meshes with sprocket 30, the rotation of indexing drive gear 32 can also cause sprocket 20 to rotate.
  • the rotation of sprocket 20 is controlled based upon the position of sheave halves 17, 18.
  • actuators 28 can be selectively engaged to rotate sprockets 20 such that even at a non-integer spacing, a tooth of sprocket 20 is in proper position for meshing with chain 50.
  • Such control over the corresponding motions of sheave halves 17, 18, and the activation of actuators 21, 28 may be mechanical and/or may also be computer controlled.
  • each of sprockets 20 can be actuated at the same time.
  • each sprocket 20 can be indexed separately and/or independently.
  • sprockets 20 are only indexed while they are not under load. More particularly, indexing may occur during the time a sprocket 20 is not engaged with chain 50, and/or transmission may hold-off indexing a sprocket 20 while such sprocket 20 is engaged with chain 50.
  • Worm gear 29 described in the indexing mechanism thus provides a manner for facilitating and coordinating actuation of actuator 28 and movement of sprocket 20.
  • Worm gear 29 may be replaced with another suitable type of gear; however, in some embodiments, worm gear 29 may also facilitate reduction of slip between input system 11 and chain 50.
  • worm gear 29 may also facilitate reduction of slip between input system 11 and chain 50.
  • the transmission of torque through sprocket 20 back through actuator 28 can be substantially prevented as worm gear 28 can act as a braking mechanism and resist such movement.
  • worm gear 29 is the only worm gear illustrated, other gears may be worm gears, helical gears, bevel gears, spur gears, or have any other suitable gear configuration.
  • actuators 21, 28 can be any suitable actuator, including at least stepping motors.
  • transmission 100 is illustrated that is similar to transmission 10 illustrated in Figures 1A-3B. Indeed, transmission 100 may be identical to transmission 10; however, in this embodiment various features and components have been removed to facilitate the discussion relative to the transmission of power through transmission 100, including the use of input and output of transmission 100 in providing an engaged neutral, although such is merely an optional component of transmission 10 or transmission 100.
  • the illustrated embodiment shows a transmission input system 101 that includes an input 102 that is illustrated in the form of a shaft.
  • input 102 may be connected to a differential input gear 103.
  • Differential input gear 103 may, for example, be directly connected to input 102 and can, for example, be integrally formed with the shaft forming input 102, have a spline-connection with such a shaft, or be connected in any other suitable manner.
  • differential input gear 103 may, for example, be directly connected to input 102 and can, for example, be integrally formed with the shaft forming input 102, have a spline-connection with such a shaft, or be connected in any other suitable manner.
  • differential input gear 103 may, for example, be directly connected to input 102 and can, for example, be integrally formed with the shaft forming input 102, have a spline-connection with such a shaft, or be connected in any other suitable manner.
  • differential input gear 103 may, for example, be directly connected to input 102 and can,
  • differential input gear 103 be directly connected to input, and differential input gear 103 can, in other embodiments, be indirectly connected to input 102 by, for example, one or more other gears and/or linkages.
  • differential input gear 103 is configured to be rotated by input 102.
  • input gear 103 can also rotate in that same direction, at a same rotational speed.
  • differential input gear 103 is positioned, sized, and configured to mate with multiple gears and thereby transfer the rotational input it receives from input 102 to such gears.
  • differential input gear 103 transfers the input power to two different gears. More particularly, differential input gear 103 mates with an input gear 104 and an input transfer gear 402. The path of the power as transferred along the two separate paths will be discussed in turn.
  • Input gear 104 rotates.
  • input gear 104 rotates in an opposite direction as differential input gear 103, such that if differential input gear 103 rotates clockwise, input gear 104 will rotate counterclockwise.
  • Input gear 104 may further be connected to shaft 106 in any suitable manner, including connection mechanisms discussed herein. Such a connection therefore allows shaft 106 to rotate as input gear 104 rotates.
  • Also connected to shaft 106 are a set of sheaves halves 108, 110 that shaft 106 causes to rotate. Sheave halves 108, 110 may rotate in either a clockwise or counter-clockwise direction, based on the connection and links within input system 101. In the illustrated embodiment, however, if input gear 104 rotates in a counterclockwise direction, such may cause shaft 106 and sheave halves 108, 110 to also rotate in a counterclockwise direction.
  • Sheave halves 108, 110 may be directly connected to shaft 106 by a spline- connection or other suitable connection mechanism. In other embodiments, however, sheave halves 108, 1 10 are connected in other manners, including by way of intermediate gear trains or linkages. Accordingly, it is not necessary that sheave halves 108, 1 10 rotate in the same direction as shaft 106 and/or input gear 104.
  • Input system 101 thus receives a power input through transmission input 102 and transfers such power to sheave halves 108, 110 which rotate in response to receipt of such power input.
  • the rotation of sheave halves 108, 1 10 is based on the rotation of shaft 106, but such rotation need not match the rotational input of transmission input 102 in magnitude or direction.
  • the rotation of sheave halves 108, 1 10 may be geared up or down relative to input 102.
  • rotation of sheave halves 108, 1 10 may be in the same or opposite direction as that of input 102.
  • sheave halves 108, 1 10 may not be positioned on shaft 106, such that while some embodiments may have the rotation of sheave halves 108, 110 correspond to that of shaft 106, it need not always be the case.
  • input system 101 may have power transmitted therethrough transferred to power output system 300 by using an intermediate belt 200.
  • belt 200 may be connected to sheave halves 108, 110, such that as sheave halves 108, 110 rotate (e.g., counterclockwise), they also cause belt 200 to rotate in a corresponding direction.
  • the rotation transferred to belt 200 by sheave halves 108, 110 may be caused by friction or in any other suitable manner such as those described herein.
  • sheave halves 108, 1 10 may connect with belt 200 in connection with one or more sprockets (see Figures 2A- 3B) that also engage belt 200. In this manner, slip between sheave halves 108, 1 10 can be minimized and efficient power transmission can be obtained.
  • Belt 200 as it rotates, also engages sheave halves 302, 304 of power output system 300 and sheave halves 302, 304 are thereby caused to have a corresponding rotation. Accordingly, and by way of example only, a counterclockwise rotation of belt 200 may cause sheave halves 302, 304 to also rotate in a counterclockwise direction. Sheave halves 302, 304 also may engage belt 200 in any suitable manner, including by friction and/or with the use of a sprocket. In this manner, belt 200 may be a relatively simple belt which sits between sheave halves 302, 304 or may be a chain that not only engages sheave halves 302, 304, but which also stays positively engaged with one or more sprocket gears. Furthermore, in some embodiments, sheave halves 302, 304 and/or sheave halves 108, 110 may be eliminated entirely.
  • Sheave halves 302, 304 are in the illustrated embodiment thus rotated by belt 200. Moreover, sheave halves 302, 304 are in this embodiment also connected to an output shaft 306 that rotates in a direction corresponding to that of sheave halves 302, 304. Such connection between output shaft 306 and sheave halves 302, 304 may be in any suitable manner, and may, for example, be a splined connection. Output shaft 306 can thus provide an output from transmission 100 and/or from power output system 300. Furthermore, the power output may be in the form of a rotational output that is geared up or down relative to the power received at input 102 of input system 101. For instance, as described previously, various gears in input system 101 may be used that ultimately provide a gear ratio.
  • sheave halves 108, 1 10 of input system 101 and/or sheave halves 302, 304 of power output system 300 may also provide an additional or alternative gear ratio. More particularly, sheave halves 108, 110 and/or 302, 304 may move inward or outward, thereby changing the path of belt 200. For instance, sheave halves 108, 1 10 may move closer together, thereby causing belt 200 to move radially outward from the center of sheave halves 108, 110. At the same time, sheave halves 302, 304 may move outward relative to each other, such that belt 200 moves radially inward with respect thereto.
  • sheave halves 108, 110 may cause belt 200 to have a larger radius of curvature than belt 200 has around sheave halves 302, 304.
  • each rotation of sheave halves 108, 110 may thus cause more than a single rotation in sheave halves 302, 304, such that output shaft 306 has a greater rotational speed than does shaft 106.
  • An opposite effect may of course also be obtained if the radius of curvature around sheave halves 108, 110 is less than the radius of curvature of sheave halves 302, 304, in which case a single rotation of sheave halves 302, 304 would require multiple rotations of sheave halves 108, 1 10.
  • sheave halves may change in a variety of different manners.
  • sheave halves 108, 1 10 may move to a position that causes belt 200 to have a radius of curvature that is equal to, less than, or greater than the radius of curvature of belt 200 around sheave halves 302, 304.
  • both sets of sheave halves 108, 110 and 302, 304 may move (e.g., inwardly or outwardly), in other embodiments only a single set of sheave halves may move. Indeed, it is not necessary that both shaft 106 and 306 be connected to sheaves.
  • belt 200 may be a chain and sheave halves 108, 110 may be replaced by a sprocket around which belt 200 rotates.
  • belt 200 may also move around a chain tensioner that picks up any slack in belt 200 as caused by the changing radius of curvature of belt 200.
  • sheave halves 108, 110 are of the same size as sheave halves 302, 304, this need not be the case and the sheave of power input system 101 may be larger or smaller with respect to a sheave of power output system 300.
  • shaft 306 may, in some cases, provide the final output of transmission 100, it need not do so in all embodiments, Indeed, in the illustrated embodiment, the output of shaft 306 is further geared through a differential system 400.
  • Differential system 400 in the illustrated embodiment, can provide a variety of features, one of which may be an engaged neutral by which input 102 remains positively connected to output shaft 306 through input system 101, belt 200 and output system 300. Furthermore, as described herein, input 102 may also remain positively engaged with transmission output 422 even when a zero output is provided.
  • the power received through transmission input 102 may be split along multiple paths.
  • transmission input is passed from input 102 to transfer gear 402 (e.g., through differential input gear 103).
  • differential input gear 103 mates with transfer gear 402, such that transfer gear 402 rotates as a power input is received at input 102.
  • a clockwise rotation of differential input gear 103 may cause transfer gear 402 to rotate in a counterclockwise direction.
  • Transfer gear 402 may, in turn, be connected to a differential input shaft 404 in any suitable manner, and differential input shaft 404 may also thus rotate as input 102 and transfer gear 404 rotate (e.g., in a counterclockwise direction).
  • input 102 and differential input shaft 404 may rotate at approximately the same speed, in other embodiments the rotation of input differential shaft 404 may be geared up or down relative to transmission input 102.
  • differential input shaft 404 has a differential input gear 406 connected thereto.
  • differential input gear 406 is integrally formed with shaft 404 and rotates in the same direction and with the same rotational speed of input shaft 404, but it may also be connected to shaft 404 in other suitable manners (e.g., splined-connection, welded, linked through other gears, etc.).
  • an output transfer gear 408 may be connected to output shaft 306 of output system 300.
  • output transfer gear 408 may mate with a linking gear 410, which in turn mates with a housing input gear 412.
  • housing input gear 408 may rotate counterclockwise
  • linking gear 410 rotates clockwise
  • housing input gear 412 rotates counterclockwise.
  • the illustrated embodiment of output transfer gears 408, linking gear 410 and housing input gear 408 is merely exemplary, and other embodiments are possible.
  • housing 414 may directly in-line with output 306 and/or may be secured directly thereto.
  • housing 414 may also be connected to housing input gear 412, and housing 414 is optionally configured to rotate with housing input gear 412.
  • the illustrated gears between output transfer gear 408 and housing input gear 412 are used to transfer the power from power output system 300 to housing 412, so that as a power output is received on shaft 306, housing 412 also rotates.
  • the rotation of housing 414 may be configured in any suitable manner relative to output shaft 306.
  • gears 408, 410, 412 may provide a gear ratio such that housing 412 rotates at a rotational speed less than, equal to, or even greater than the rotational speed of output shaft 306.
  • housing 414 may have multiple gears secured thereto, or therewithin.
  • a first moon gear 416 may be connected to housing 414 and can engage differential input gear 406.
  • differential input gear 406 is approximately centered within housing 414, and, as best illustrated in Figure 4C (which has housing 414 removed to provide a better view of gears 416, 418 and 420 within housing 414), first moon gear 416 may not be centered within housing 414.
  • the positioning of first moon gear 416 in the illustrated embodiment is such that as housing 414 rotates, first moon gear 416 also orbits around differential input gear 406.
  • first moon gear 416 may also engage a second moon gear 418 that orbits with housing 414. As first moon gear 416 thus orbits and rotates, it can thus also cause second moon gear 418 to rotate in addition to its orbit provided through housing 414.
  • a differential output gear 420 is, in the illustrated embodiment, is secured to housing 414 and engages second moon gear 414. In this manner, as second moon gear 414 rotates, it transfers power to differential output gear 420.
  • Differential output gear 420 may, in turn, be connected to an output shaft 422 which may be the transmission output, or may be coupled to the transmission output.
  • differential system 400 can thus provide a differential, but which does not necessarily operate in the same manner as a typical differential such as might be found in an automotive or other power transmission system.
  • a differential may be used in the final drive on an axle of the vehicle.
  • a single input may interconnect with two outputs— one going to either axle on a front drive.
  • the illustrated differential system 400 operates in a different manner and, in many regards, opposite the described typical differential.
  • a first input to differential system 400 is provided from transmission input 102 and ultimately conveyed into housing 414 through shaft 404 and differential input gear 406.
  • a second input to differential system 400 is provided from output shaft 306, and is applied directly to housing 414.
  • differential system 400 there may thus be two different inputs provided to differential system 400, and the two inputs may be combined into a single output. Additionally, based on the directions and magnitudes of such inputs, they may be additive and/or subtractive within differential system 400.
  • input from transmission input 102 can be provided and transferred such that differential input gear 406 rotates in a first direction (e.g., counterclockwise).
  • the rotation of output shaft 306 may also be transferred to housing 414 so that housing 414 rotates in the same direction (e.g., counterclockwise), although input gear 406 and housing 414 may, in other embodiments, provide inputs that are in opposite directions.
  • the variations to the respective magnitudes of the rotational inputs can ultimately provide a variety of different outputs at output 422, including a reverse, neutral, drive and overdrive for transmission 100.
  • two inputs can combine to provide a clockwise or counterclockwise rotation, or even to provide no output.
  • housing 414 may also be rotating and causing first moon gear 416 to orbit around transmission input gear 406 in the same direction.
  • the velocity of the gear teeth at the point of engagement must be equal as to direction and magnitude.
  • second moon gear 418 may be eliminated entirely, or additional moon or other gears can be provided.
  • gears within housing 414 may be different sizes such that the above relationship between the output and two input rotational velocities can change.
  • the input may even be disconnected and allowed to rotate freely, or held with zero internal rotation.
  • input gear 406 and housing 414 may receive inputs in opposite directions.
  • first moon gear 416 there may be additional first moon gears 416 that each engage differential input gear 406, thereby transferring the torque among multiple gears.
  • second moon gears 418, or other gears within differential system 400 there may also be additional second moon gears 418, or other gears within differential system 400.
  • first moon gear 416 can thus with or against each other, such that the rotational speed of first moon gear 416 (as opposed to the orbital motion of first moon gear) can be in a clockwise or counterclockwise direction.
  • One feature of the disclosed differential system 100 is the ability to start with engagement from a dead stop.
  • a vehicle with a high torque engine e.g., a semi-tractor trailer
  • a high torque engine e.g., a semi-tractor trailer
  • such a vehicle can maintain engagement while moving the load forward in infinitely small increments.
  • infinitely small increments of change can be used to cause the vehicle to move, such that there is little to no rollback when starting the movement, and the infinitely small increments of change can also reducing a torque spike when engaging the engine.
  • gears may be removed or added to provide additional gear ratio changes, and/or to link inputs or outputs to other components.
  • housing 414 may be directly coupled to output shaft 306 and/or positioned in-line therewith.
  • the various gears and components described with regard to transmissions 10 and 100 may be positioned on bearing surfaces.
  • first and second moon gears 416, 418 and/or differential output gear 420 may have bearing surfaces interfacing with housing 414 to thereby allow rotation within housing 414.
  • Figures 5A-5C illustrate an embodiment of a sheave-and-belt transmission 1000 according to another embodiment of the present invention.
  • transmission 1000 may, however, operate on the input and/or output sides of a transmission.
  • transmission 1000 operates in a manner similar to transmissions 10, 100 described herein.
  • transmission 1000 includes a sheave 1002 that includes two halves 1004, 1006.
  • Sitting on sheave 1002 may be a belt or chain (not shown) which then connects to another drive or driven member.
  • transmission 1000 may be an input system and drives the belt or chain as it connects to a sprocket or other sheave on an output system.
  • the belt or chain may also connect to a driven sprocket as well as a chain tensioner to account for changes to the belt or chain by virtue of movement of sheave 1002.
  • transmission 1000 includes one or more sprockets 1008 which run between sheave halves 1004, 1006. As with transmissions 10, 100 described previously, sprockets 1008 may move radially inward and outward to adjust position as sheave halves 1004, 1006 are moved together or apart. With particular regard to Figure 5B, an adjustment mechanism 1040 is illustrated. In Figures 5A and 5B, only a single sprocket 1008 is illustrated; however, transmission 100 is equipped to have four sprockets. The number of sprockets 1008 is variable, however, and can be changed to suit a particular application. In Figure 5B, a ring gear 1024 is illustrated.
  • Ring gear 1024 is further connected to a linking gear 1026, although there may be one linking gear 1026 for each sprocket 1008.
  • ring gear 1024 can be rotated. Rotation of ring gear 1024 may cause linking gears 1026 to rotate as well.
  • Linking gears 1026 are attached to an arm 1028 which in turn attaches to a shaft 1030. Rotation of linking gears 1026 causes arm 1028 to rotate. Arm is positioned within a channel 1005 of sheave half 1004. The rotation of arm 1028 causes movement of shaft 1030 to move along the arc path provided by channel 1005.
  • Sprocket 1008 is attached to shaft 1030, so that as shaft 1030 moves along channel 1005, sprocket 1008 moves radially inward and outward.
  • ring gear 1024 may even be eliminated entirely.
  • sheave 1002 may have channels formed therein along which shafts 1030 move.
  • shafts 1030 can be fitted within channels 1005 in such a way that movement of sheaves 1002 automatically causes shafts 1030 to float within channels 1005.
  • Figures 5 A and 5C further illustrate exemplary components of an indexing system 1040 that can rotate sprockets 1008 as necessary to ensure a suitable engagement as sheaves 1002 and sprockets 1008 move to produce different gear ratios.
  • indexing system 1040 includes an actuator 1042 that can cause an outer gear 1044 to rotate. Outer gear 1044 engages a indexing ring gear 1048 that rotates.
  • An interior gear 1050 may be positioned within ring gear 1048 (although there may be one interior gear 1050 for each of sprockets 1008).
  • indexing ring gear 1048 may be positioned off-center relative to shaft 1001 on which sheaves 1002 are positioned.
  • the various interior gears 1050 may alternately engage ring gear 1050. As they do so, they may engage a worm driving gear 1052 that then operates with a worm gear 1054 to index a sprocket 1008 in a manner similar to that previously described. For instance, worm gear 1054 may cause sprockets 1008 to rotate while they are not under load from the chain that moves around sheave 1002.
  • eccentric or off-center gear is not the only manner in which mechanical intelligence may be utilized in this regard.
  • four chains may be positioned on four sheaves. During operation, only one sheave may be carrying the load.
  • a differential is used as a mechanical intelligence device.
  • the inputs change relative to each other (e.g., by changing the distance between sheave halves so that the chain moves radially)
  • a corresponding change will be obtained as an output of the differential.
  • rotational size changes there may be a proportional change in the rotational output of the differential.
  • this can be tied back into the sprockets to automatically adjust the sprockets for engagement at non-integer locations.
  • a motor or actuator may not be necessary for sprocket correction.
  • the chain itself may be corrected.
  • a roller may be placed outside the chain, and can then adjust the chain position to engage even at non- integer locations.
  • Figure 6 illustrates a side view of an example transmission 5000 according to some embodiments of the invention.
  • a single sheave 5005 is used (and illustrated with half of the sheave missing so as to provide a more detailed view of the interior of the transmission).
  • one side of chain 5010 loops around sheave 5005, while the other end of chain 5010 loops around a sprocket 5015.
  • one or more chain tensioners 5020 can be included to pick-up any slack in chain 5010 as sheave 5005 adjusts in size.
  • Figures 7A-7D another example embodiment of aspects of a transmission system are described.
  • Figures 7A-7D illustrate an example sheave assembly 6005 usable with transmission systems as described herein.
  • sheave assembly 6005, or portions thereof may replace or supplement power input system 11 and/or power output system 70 of Figures 1A-3B, input system 101 and/or output system 300 of Figures 4A-4C, the illustrated portion of transmission 1000 of Figures 5A-5C, or sheave 5005 or sprocket 5015 of Figure 6.
  • Sheave assembly 6005 of Figures 7A-7D includes various components operating similar to components described elsewhere herein. Accordingly, to avoid obscuring additional aspects of sheave assembly 6005, such components will generally not be described, as a suitable discussion is found above. Rather, additional detail will be give to additional and novel components in this embodiment.
  • a shaft 6001 may pass through sheave assembly 6005 and have attached thereto two sheave halves 6004.
  • Sheave halves 6004 are, in this example, attached to shaft 6001 using a splined connection on shaft 6001, although other types of connections may also be used.
  • the splined connection on shaft 6001 can allow shaft 6001 to rotate and also generate a corresponding rotation on sheave halves 6004; however, as sheave assembly 6005 may also operate as an output assembly, sheaves halves 6004 may provide the input and cause shaft 6001 to rotate.
  • sheave halves 6004 may be movable axially along shaft 6001. Such axial movement may, for example, allow a chain or belt riding on sheave halves 6004 to move radially inward and outward relative to shaft 6001, thereby changing a gear ratio of the transmission.
  • two hydraulic actuators 6064 are provided on shaft 6001 and can use fluid pressure to compress sheave halves 6004 together, or such fluid pressure can be backed off to allow sheave halves 6004 to separate.
  • indexing gears 6020 configured to engage with a chain positioned around sheave halves 6004. Indexing gears 6020 can engage the chain and act to prevent or reduce slippage of the chain on sheave halves 6004.
  • the number of indexing gears 6020 may be varied, although in one embodiment, three indexing gears 6020 are spaced around shaft 6010. In other embodiments, more or fewer indexing gears 6020 may be used.
  • indexing gears 6020 may also move radially inward and outward relative to shaft 6001. In the illustrated embodiment, this may be accomplished using an indexing system that includes a slot 6021 and worm gear 6050. Indexing gears 6050 may rotate around a shaft and worm gear 6050 may be directly or indirectly connected to an electric, hydraulic, or mechanical actuator (not shown). As such actuator causes worm gear 6050 to rotate, a carrier attached to the shaft on which indexing gears 6004 rotate may move upward or downward, depending on the direction of actuation on worm gear 6050. The shaft may thus move radially inward or outward through slot 6021.
  • indexing gears 6020 may be along an arcuate path.
  • slot 6021 is generally linear, so it will be appreciate that the radial translation of gears 6020 may also follow a generally linear path.
  • Indexing gears 6020 generally move along slot 6021 when not under load, and can each move independent of each other, or may move collectively. Further, as shown in Figures 7A-7D, indexing gears 6020 may move along slots in both sheaves 6004.
  • the illustrated example embodiment includes a cross-over shaft 6032.
  • Cross-over shaft 6032 is coupled to a pair of linking gears 6030 that may in turn engage a drive gear to drive worm gears 6050, or may directly drive worm gears 6050.
  • a single cross-over shaft 6032 is illustrated; however, one may be included for each of indexing gears 6020.
  • multiple cross-over shafts 6032 may be included to separately and independently move indexing gears 6020, although a single cross-over shaft 6032 may be linked to collectively cause indexing gears 6020 to translate.
  • a single cross-over shaft 6032 may be fixed, such that it does not orbit around shaft 6001.
  • indexing gears 6020 and worm gears 6050 rotate around shaft 6001
  • the control mechanism interacting with worm gears 6050 can alternatively engage cross-over shaft 6030 (e.g., through linking gears 6030) to index their position.
  • indexing gears 6020 By translating indexing gears 6020 as sheaves 6004 move, indexing gears
  • indexing gears 6020 may remain in constant contact with the associated chain, and can act as a non- slip mechanism.
  • the translation movement of indexing gears 6020 may be referred to herein as “indexing”, as gears 6020 are indexed to correspond to the radial position of the chain on sheaves 6004.
  • Another mechanism, referred to herein “correcting” and as discussed hereafter, may relate to the rotational movement of indexing gears 6020 to align teeth of indexing gears 6020 with pockets of the chain.
  • indexing and correcting may sometimes be used interchangeably; however, “indexing” generally relates to the radial movement of indexing gears 6020 relative to shaft 6001, while “correcting” relates to the rotational movement of indexing gears 6020 about their own axes.
  • indexing gears 6020 illustrated in Figures 7A-7D is a correction mechanism usable to rotate indexing gears, and to thereby advance and/or retreat teeth of indexing gears 6020 as desired for alignment with the chain.
  • tooth profiles are generally calculated and determined based on a radius (e.g., pitch radius).
  • a radius e.g., pitch radius
  • indexing gears 6020 can have a fixed size, the changes may then be accounted for in a different manner— namely by correcting the rotation of the indexing gears.
  • such correction will be performed while indexing gears 6020 are not under load (e.g., not engaged with the chain), although in other embodiments it may be desired to correct motion while under load.
  • indexing gears 6020 are corrected by a correcting mechanism/correction means that includes worm gears 6070.
  • the example embodiment includes an indexing gear 6020 that is connected, at least indirectly, to a worm gear 6070 and, as the worm gear 6070 rotates, a kinematic transfer of power causes indexing gears 6020 to rotate.
  • worm gears 6070 may be coupled to a set of one or more driving gears 6080, 6081 that cause worm gear 6070 to rotate.
  • a transfer gear 6070 that is linked to the shaft of indexing gear 6020 rotates, thereby also rotating indexing gear 6020.
  • indexing gears 6020 The particular manner of correcting indexing gears 6020, as described and illustrated herein, is merely exemplary. Moreover, the manner of controlling such a correction mechanism may also be varied in any suitable manner. For example, a controller may be included that mechanically, electrically, hydraulically, or otherwise controls operation and correction of indexing gears 6020. In the illustrated embodiment, for instance, a hydraulic control system is illustrated.
  • each reversing turbine disk 6048a-c of the illustrated embodiment may rotate around a shaft and can move in a forward and reverse direction, which can ultimately be transferred to the indexing gears 6020 so as to advance or retreat the teeth of indexing gears 6020.
  • each of turbine disks 6048a-c is linked to an interior main gear 6047a-c.
  • turbine disk 6048a links to interior main gear 6047a
  • turbine disk 6048b links to interior main gear 4047b
  • turbine disk 6048c links to interior main gear 6047c.
  • each of interior main gears 6047a-c may also link to a correction drive gear 6046a-c corresponding to one of indexing gears 6020.
  • correction drive gear 6046b engages interior main gear 6047b.
  • correction drive gear 6046b may also rotate and transfer power to driving gears 6080, 6081 (e.g., along a shaft) to ultimately control and correct the rotation of indexing gears 6020.
  • each of the three turbine disks 6048a-c can correct one of indexing gears 6020.
  • any indexing gear 6020 can be corrected independent of any other indexing gear 6020.
  • any number of control and actuation mechanisms and means can accordingly be used to adjust a transmission according to the present invention.
  • one actuator may move sheave halves 6004 axially, while a separate actuator indexes indexing gears 6020 by causing them to translate radially, and while a still other actuator corrects gears 6020 by causing them to rotate.
  • some or all actuators may be combined together.
  • radial translation of indexing gears 6020 may be configured to cause a correcting rotation.
  • the correcting rotation may be all or a part of the needed correction motion.
  • One aspect of the embodiments disclosed herein are further the ability to control and/or minimize vibrational aspects associated with the disclosed transmissions.
  • a friction belt stretches as it unwraps off a sheave, as a result of the tension in the belt.
  • a chain drive system also stretches the chain as the chain becomes disengaged and experiences the tension in the chain.
  • the chain may stretch link-by-link, as each link becomes disconnected from each tooth. The full stretching may not be instantaneous and some stretching may occur as the chain wraps around the sheaves; however, a large portion of the stretching may still occur at disconnection between a chain link and a carrying sprocket/sheave.
  • a vibration may be produced.
  • the chain may stretch back to each other sprocket, such that vibration may occur as the angular relationship in the chain changes three times per revolution.
  • the embodiments herein can, however, provide control to correct or minimize such vibration.
  • a transmission may include a correction mechanism to rotate the indexing gears. By correcting the indexing gears and rotating them about their axes, the transmission can be adjusted to control at least the period of the vibration and reduce or minimize the effect of such vibration.
  • the correction of the indexing gears to control the vibration may result in a small amount of slip occurring between the chain relative to the sheave.
  • slip while not necessarily desirable in itself, may nonetheless be desired on a system perspective as the slip can be managed and may help control unwanted vibration.
  • the amount of slip can be defined relative to the stretch of the chain to limit its effect.
  • advancing and/or retreating the sprocket may be of significant use in controlling vibration of a transmission, and the forward/backward control of the rotation of the sprockets permits the sprocket to become loaded during rotation.
  • a number of components of the sheave assembly 6005 may thus be collectively moving in one or more directions.
  • virtually all components on shaft 6001 may collectively rotate with shaft 6001.
  • actuators 6047 may be connected to shaft 6047 using a bearing surface, such that actuators 6047 need not rotate as shaft 6001 rotates.
  • cross-over shaft 6032 may also be on a bearing surface (e.g., with the housing of the transmission), such that cross-over shaft 6032 and gears 6030 do not rotate around shaft 6001.
  • Other components may co-rotate with shaft 6001.
  • Transmission 6000 may include various aspects as described above. Accordingly, the following discussion related to Figures 8A and 8B is intended to provide additional detail with respect to various components, assemblies, and features, but is not intended as a complete discussion of transmission 6000. Accordingly, other aspects of exemplary transmissions as described herein are also incorporated into, and usable in connection with, transmission 6000 of Figures 8A and 8B.
  • transmission 6000 may include variety of different components and assemblies.
  • transmission 6000 includes a sheave assembly 6005 and an output assembly 6007.
  • Output assembly 6007 is optionally connected to sheave assembly 6005 by using a wrapping member 61 10 that wraps at least partially around sheave assembly 6005 and output assembly 6007.
  • Wrapping member 61 10 may include a chain or belt, although in other embodiments, other components such as gears, may connect output assembly 6007 to sheave assembly 6005.
  • wrapping member 61 10 is schematically illustrated to represent that multiple types of components may be used to connect sheave assembly 6005 and output assembly 6007.
  • output assembly 6007 is illustrated without sheaves, it will also be appreciated in view of the disclosure herein that output assembly 6007 may also have sheaves or be otherwise configured.
  • sheave assembly 6005 may have a driven gear and lack sheaves.
  • wrapping member 61 10 may engage a driven chain gear 6200 of output assembly 6007, with driven chain gear 6200 acting as a sprocket.
  • wrapping member 6110 may engage a set of sheaves, a sheave cluster, internal moon gears, and/or other types of output gears or members.
  • output assembly 6007 is connected to a tensioning assembly 6300.
  • sheave assembly 6005 may be configured such that it can move wrapping member 6110 radially relative to the axis of sheave assembly 6005. As wrapping member 6110 moves, tension or slack may occur within wrapping member 6110.
  • tensioning assembly 6300 may be used to adjust the tension in wrapping member 6110 so as to increase or decrease the slack therein. For instance, when wrapping member 61 10 moves on sheave assembly 6005 to increase the tension, tensioning assembly 6300 may be used to relieve some of the tension. Alternatively, when wrapping member 61 10 moves on sheave assembly 6005 and slackens, tensioning assembly 6300 may be used to increase the tension.
  • tensioning assembly 6300 can be used to dynamically adjust the tension in wrapping member 61 10.
  • tensioning assembly 6300 may be used to maintain wrapping member 61 10 at a generally constant tension despite changes in gear ratios and/or positioning of wrapping member 6110.
  • tensioning assembly 6300 may be configured in any suitable manner.
  • tensioning assembly 6300 may include a tensioner arm 6302 and a tensioner 6304.
  • tensioner arm 6302 is arranged such that it engages with, and optionally holds thereon, driven chain gear 6200.
  • the position of driven chain gear 6200 may be altered, thereby changing the path of wrapping member 6110 and affecting the tension in wrapping member 6110.
  • the illustrated embodiment of tensioner arm 6302 is configured to be fixed at a pivot 6303, and connected to tensioner 6304 at a location displaced from pivot 6303.
  • tensioner 6304 applies a force to tensioner arm 6302
  • the direction of the force can cause tensioner arm 6302 to rotate around pivot 6303 in either of two directions.
  • Tensioner arm 6302 may further be connected to tensioner 6304.
  • tensioner 6304 may act as an actuator, or be connected to an actuator.
  • tensioner 6304 can be actuated to move tensioner arm 6302.
  • tensioner 6304 may have a piston/cylinder arrangement to facilitate movement of tensioner arm 6302.
  • Such an arrangement may be actuated in any suitable way, including mechanically, electrically, pneumatically, or hydraulically.
  • one end of tensioner 6304 is illustrated as being free.
  • Such a free end may be connected to a transmission housing (not shown) to ground against such housing in providing the actuating force to move tensioner arm 6302.
  • a piston/cylinder actuator is illustrated, still other types of actuators may be used. Indeed, any suitable actuator that may be used to adjust the position of sheave assembly 6005, output assembly 6007, and/or wrapping member 61 10 may be used to tension wrapping member 6110.
  • a conventional CVT may operate with a belt disposed between two sets of sheaves.
  • the sheaves may move inward or outward, thereby changing the positioning of the belt.
  • the sheaves act in opposite directions.
  • the use of a chain and single sheave allows a sheave to optionally move in one direction, with a rotating arm and actuator used to maintain the tension in the wrapping member, but without a sheave moving opposite a first sheave.
  • the tension in a chain or other wrapping member may be adjusted by a tensioner that operates on one or both of an input assembly, as well as on a pair of sheave clusters. Accordingly, the tensioner may operate on a sheave, on a sheave cluster, on multiple sheave clusters, on a sprocket, or in any other suitable manner.
  • transmission 6000 may include a reverse differential 6400.
  • reverse differential 6400 may have two inputs that are combined to produce a single output.
  • reverse differential 6400 may have a first reverse differential input provided by a reverse differential input shaft 6013, as well as a second reverse differential input provided by a carrier driver 6204.
  • these two inputs may be combined in a manner that produces a single output, such as may be received at output shaft 6402.
  • a pass-through shaft 6001 may be positioned within at least a portion of sheave assembly 6005.
  • pass-through shaft 6001 may pass through all, or substantially all, of sheave assembly 6005.
  • the rotational speed of pass-through shaft 6001 may be directly related to the input to transmission 6001, or may otherwise be related to a partial gear-ratio that may not be influenced by, for example, output assembly 6007.
  • Pass-through shaft 6001 may, in this example, also be connected to a first input transfer gear 6009.
  • a second input transfer gear 6011 that is optionally aligned with reverse differential input shaft 6013 may engage first input transfer gear 6009.
  • the rotational speed of pass- through shaft 6001 may be passed to reverse differential input shaft 6013, although one or more transfer or other gears may effect a gear ratio between the rotational speed of pass-through shaft 6001 and the rotational speed of reverse differential input shaft 601 1.
  • output assembly 6007 includes a driven chain gear 6200 that is driven by wrapping member 6110.
  • Driven chain gear 6200 may be connected to, engage, or otherwise be related to one or more other gears of a drive output gear chain 6202.
  • Drive output gear chain 6202 may be configured to receive a rotational or other input from driven chain gear 6200 and translate the input to a carrier driver 6204.
  • Carrier driver 6204 is, in this embodiment, a gear configured to mate with an external gear profile on a housing of reverse differential 6400.
  • the output of driven chain gear 6200 may be transmitted to carrier driver 6204, which in turn may cause the housing of reverse differential 6400 to rotate.
  • Internal components of reverse differential 6400 may be fixed to the housing, such that the internal components may thus also receive a rotation causing them to orbit around a rotational axis of reverse differential 6400.
  • Figure 9 schematically illustrates an example of a transmission system 7000 that includes a drive system 7002 and a driven system 7004.
  • the drive system 7002 can include, for example, a sheave and one or more sprockets. Exemplary embodiments of such a drive system include those described herein.
  • the driven system 7004 can also include a sheave and one or more sprockets, and may be consistent with embodiments described herein. In some embodiments, only the drive system 7002 or the driven system 7004 includes a sheave, while the other of the drive and driven systems 7002, 7004 includes a gear of a fixed size.
  • a set of additional gears or other components may also engage a chain belt, or other wrapping member that extends between the drive and driven systems 7002, 7004.
  • three components 7006, 7008, 7010 may be used.
  • two of the components e.g., component 7006, 7008) have a fixed position.
  • a third component e.g., 7010
  • the third component 7010 may act in some embodiments as a tensioner that can be used to adjust the tension in the wrapping member. For instance, the tension may be adjusted to remain constant while changes in gear ratios occur, or the tension may vary as desired.
  • the other two components 7006, 7008 may also be used in any suitable manner. According to one embodiment one or both of the components 7006, 7008 act as reference components.
  • one aspect of an infinitely variable transmission is that such a transmission may operate at non-integer ratios. At such ratios, the size of the sheave may not correspond to an integer number of gear teeth (e.g., gear teeth, chain pitch, etc. may not be wholly divisible into the circumference of the chain around a reference circle). As a result, some correction in gear teeth may be performed.
  • such correction may be performed by, for instance, using a sensor or encoder that determines a position of the sheave, chain, sprocket, and/or other components, and adjusts the position of a sprocket to correspond to a proper pocket location in a chain.
  • a mechanical, electrical, or other system may monitor the follower.
  • the components 7006, 7008 can have fixed locations. By monitoring or otherwise knowing the position of such a fixed component, the location of the chain can be determined, as well as the required position of the teeth of a sprocket.
  • Figures 10A-10F illustrate aspects of an exemplary system generally corresponding to the schematically illustrated transmission system 8000 of Figure 9.
  • a single side of a transmission is illustrated (e.g., an input system), although it will be appreciated that other exemplary embodiments may include the illustrated system as a driven system, or in both drive and driven systems.
  • a sheave 8002 includes one or more sprockets 8004 therein.
  • the sprockets 8004 and sheave 8002 may be configured to receive a chain or other wrapping member.
  • a follower gear 8006 may also be included.
  • the follower gear 8006 may correspond, for example, to a static component illustrated in Figure 9.
  • a gear train 8008 is coupled to the follower gear 8006.
  • the gear train 8008 couples to a drive ring 8010.
  • the drive ring 8010 can, in turn, be coupled to a shaft on which the sprockets 8004 rotate.
  • rotation of the follower gear 8006 can be directly tied to the rotation of the sprockets 8004.
  • a correction mechanism includes a set of pocketed rings 8012, 8014. Inside the rings 8012, 8014 are a set of balls. The balls ride in the pockets of the rings. The size of the pockets may correspond, for instance, to the pitch of the teeth on the sprockets and/or the pitch of the chain.
  • the pocket rings are spring loaded.
  • the pocket ring 8012 most near the drive ring 8010 may rotate.
  • Such pocket ring 8012 may be spring loaded.
  • the spring may snap back in place, thereby releasing the biasing force.
  • the balls between the pocket rings 8012, 8014 may cause the second pocket ring 8014 to attempt to align with the first pocket ring 8012.
  • the amount of movement required for alignment may correspond to an amount of adjustment needed to correct a tooth of the sprockets 8004 to be in a proper position for chain alignment.
  • a braking mechanism is also illustrated, particularly with respect to Figures 10E and 10F.
  • a braking mechanism is coupled to the shafts on which the sprockets 8004 rotate. Attached to such shafts are cam followers 8016 which follow a ring 8018 that has a cam profile.
  • the illustrated cam profile has a constant arc over approximately two hundred forty degrees, and a second profile over one hundred twenty degrees. Over the one hundred twenty degrees, the cam profile may cause the cam to lock down on the shaft of the sprockets to cause them to lock and be at a fixed position, thereby avoiding rotation that may cause slippage between the chain and sheave.
  • the cam roller may attach to a wedge 8020 and a yoke 8022 riding on the wedge 8020.
  • the wedge 8020 can be moved, and can cause the yoke 8020.
  • the yoke 8020 may then engage the sprocket shaft at the locked position (e.g., using an angle, plate, or other clutching mechanism). Such movement may lock the shaft in place to prevent or limit rotation.
  • Figures 1 1 A- HE illustrate still another example embodiment of an exemplary correction system and braking mechanism.
  • the correction system and braking mechanism are on a same side of a sheave.
  • the system 9000 includes a set of pocket rings 9012, 9014 that may operate in a manner similar to that described above with respect to Figures 10A-10F.
  • a cam ring 9016 has a profile that can cause a brake to selectively lock sprocket axles in place.
  • a cam follower 9018 may be attached to an action arm 9020.
  • the action arm 9020 can compress a spring 9022 (e.g., a Bellville spring), as well as a set of clutch plates 9024.
  • a spring 9022 e.g., a Bellville spring
  • the sprocket axle may be locked, although in other embodiments compressing the clutch plates may allow the axle to rotate freely.
  • the transmission system 9000 includes an alternative exemplary sprocket adjustment system 9026.
  • the illustrated system may be used to, for instance, cause sprockets to move radially with respect to a sheave.
  • the sprocket adjustment system 9026 may be rotatable independent of the sheaves.
  • one or more servo or stepper motors, or other actuators may connect to the sheave and rotate with the sheaves.
  • the sprocket adjustment system 9026 may, however, rotate independent of the sheaves.
  • two actuator arms 9028 may be connected to a separate actuator. As the actuator arms 9028 are rotated, a set of gears may link to a traction ring 9030.
  • the traction ring 9030 includes a cam track 9032. As the actuator arms 9028 are moved relative to the sheave assembly, a follower 9034 within the track may move. Movement within the track can cause an arm coupled to the follower 9034 to move, and the arm can also be coupled to the sprockets to cause the sprockets to move between extended and retracted positions.
  • example embodiments of the disclosed transmission and related systems can operate at a wide variety of different drive ratios in a particular range of drive ratios.
  • the set of drive ratios in the range over which such a transmission, such as transmission 500 for example, may operate can include integer ratios, non-integer ratios, or combinations of the two.
  • the number of integer ratios in a range of drive ratios is a function of the physical characteristics of the transmission system and its components.
  • Such physical characteristics may include, among others, aspects of the variator 502 geometry such as the maximum and minimum operating diameters of the variator where the variator is implemented as a sheave, the size and number of drive members, such as moon gears 504 for example, and the length of the driven member, such as a chain 508 for example, and the number of links in the chain, if a chain 508 is employed.
  • members such as the moon gears 504 and chain 508 are not limited to the example functionalities noted above.
  • chain 508 may serve as a drive member and/or driven member, and the moon gears 504 may act as driven members and/drive members.
  • one advantage of at least some embodiments of the transmission system 500 is that they are able to operate at a relatively large number of drive ratios in a given range of drive ratios. Such functionality can provide great flexibility in terms of the various operating points of the transmission.
  • a mode of operation where the transmission system can operate at a relatively large number of drive ratios, that include both integer and non-integer drive ratios, is referred to herein as an infinite mode of operation because while any physical system may define only a certain number of integer drive ratios, that same system can also operate at a substantially larger number of non-integer ratios.
  • the moon gears 504 can be indexed to virtually any desired angle necessary to engage the chain 508, and are not limited to operating only at angles that correspond to integer ratios.
  • the variator 502 takes the form of a sheave 510 of variable diameter
  • a large number of sheave 510 diameters can be defined and employed.
  • the infinite mode nomenclature reflects the fact that a relatively large number of index variations, each corresponding to a respective non-integer drive ratio, can be made to each of the moon gears 504, and further reflects that fact that variations can be made as well to the sheave 510 diameter.
  • adjustment also sometimes referred to as indexing, of the moon gears 504
  • examples of components and devices for adjusting moon gear 504 positions which may sometimes be referred to as correction mechanisms, are disclosed and discussed elsewhere herein.
  • the operational mode where only integer drive ratios are employed may be referred to as the integer mode. This can be thought of as the relatively more general case in which the drive ratio may be any integer.
  • a more specific case of the integer mode is the IN mode where the moon gears 504 engage the chain 508 in the particular I N relationship disclosed elsewhere herein, although other specific relationships may also be defined and employed. Other differences between the integer mode and the IN mode are noted below.
  • the moon gears 504 may be maintained at index positions that correspond with the drive ratio desired to be employed and, accordingly, no indexing of the moon gears 504 is required until such time as it is desired to change the drive ratio.
  • the transmission system 500 is 'locked' or 'lockable,' and a transmission that can and/or does operate in this way may be referred to as a locking CVT.
  • the drive ratios employed in the integer and 3 ⁇ 4 modes may be referred to as locking ratios.
  • the index position of a given moon gear 504 may need to be adjusted more frequently, as often as after every disengagement of that moon gear 504 from the chain 508, in order to attain the desired position of the moon gear 504 relative to the chain 508.
  • a locking CVT may be advantageous in some circumstances inasmuch as little or no slippage between the variator 502 and belt/chain 508, for example, occurs when the moon gears 504 are locked into index positions that correspond with an integer drive ratio.
  • integer drive ratios are a function of the physical configuration of the transmission system 500 and its components
  • specific desired integer drive ratios for a given transmission can be implemented by appropriately designing the transmission and its components.
  • a desired IN drive ratio can be implemented by specifying a number of links engaged per revolution of the variator 502, and by specifying the size and number of moon gears 504 to be used.
  • Additional, or alternative, physical aspects of the transmission may be designed and implemented so as to achieve a desired set of integer drive ratios.
  • a locking CVT as disclosed herein is one example of a structural implementation of a means for transmitting power, where the power may be transmitted by the means at integer and/or non-integer drive ratios. Any other structures, systems and/or devices of comparable functionality to the locking CVT may alternatively be employed.
  • a CVT of having one or more variators of adjustable width sheave type, other device(s) of comparable functionality, and lockable drive members, such moon gears for example, may be operable in one or more of the following modes.
  • the drive ratio is any integer and the chain transmits power primarily by engaging the moon gears.
  • the moon gears may, and in at least some instances may be required to, initially index independent of one another to the appropriate angle with respect to the index line and, at any given time, one or more moon gears may be engaged with the chain while, at the same time, one or more other moon gears are disengaged from the chain (see Figure 12).
  • the chain transmits power primarily by engaging the moon gears in an I relationship.
  • the moon gears do not index independently of one another.
  • the moon gears index to whatever angle is necessary to engage the chain during the period between disengagement and reengagement of the moon gears with the chain.
  • the moon gears necessarily lock, unlock, and move as appropriate during operation to deliver power and account for the rake of the chain with respect to the drive ratio.
  • the slack side tension in any of the sequences may be substantially constant during the shift sequence, or may vary, i.e., can be dynamically adjusted during the shift sequence.
  • consideration may be given to the amount of component wear that attends particular tension levels, and consideration may also be given to changes in performance that attend different tension levels.
  • a tensioner which may take the form of a chain tensioner 512, may be employed to aid in the achievement and/or maintenance of a desired tension level in the chain.
  • Tensioners may be employed on the slack side and/or tension side of the driven member.
  • the controller initiates a shift cycle, either automatically or in response to a user input, to change the drive ratio of the transmission.
  • the variator adjusts its sheave spacing to correspond to the desired drive ratio
  • the chain tensioner adjusts during variator sheave spacing changes so as to maintain the desired chain slip rate (Figure 15).
  • the controller initiates a shift cycle, either automatically or in response to a user input, to change the drive ratio of the transmission.
  • the variator adjusts its sheave spacing so that the desired drive ratio is obtained ( Figure 14).
  • the controller adjusts the index position of the drive members so that they engage the chain properly, and this index position is maintained until the next shift sequence.
  • the controller initiates a shift cycle, either automatically or in response to a user input, to change the drive ratio of the transmission.
  • the variator adjusts its sheave spacing so that the desired drive ratio is obtained ( Figure 14).
  • the controller adjusts the engine output power and chain tension to control the relative position of the chain with respect to the index line of the drive members.
  • the chain tensioner maintains substantially constant slack side chain tension appropriate to the transmitted power of the system (Figure 15).
  • the controller initiates a shift cycle.
  • the variator adjusts its sheave spacing so that the desired drive ratio is obtained ( Figure 14).
  • the controller adjusts the index position of the drive members so that they engage the chain properly.
  • the controller While operating in non-integer drive ratios, the controller adjusts the index position of the drive members during the period that they are disengaged from the chain.
  • the chain tensioner maintains substantially constant slack side chain tension appropriate to the transmitted power of the system ( Figure 15).
  • one or more of the modes of operation and one or more of the shift sequences, including adjustments to slack side tension, can be performed and controlled with a variety of systems and devices, such as a controller for example.
  • Such systems and devices may be, for example, manual, automatic, electrical, electronic, mechanical, or any combination of the foregoing.
  • software may be employed in the operation and control of such systems and devices.
  • a CVT which may or may not be implemented and/or operate as a locking CVT, may employ one or more moon gears to drive one or more elements such as gears, or a chain.
  • the moon gears are substantially circular.
  • the moon gears may take the form of sector gears.
  • a variator in the form of a sheave is provided that is mounted to a mainshaft that is rotatably supported, such as by one or more bearing assemblies. Thus mounted, the variator sheave rotates in unison with the mainshaft.
  • the variator sheave may include two separate halves, each of which is mounted to the mainshaft and one or both of which are configured for axial motion along the axis of rotation relative to the other half.
  • the variator sheave includes a fixed half that is integrally formed with the mainshaft.
  • the fixed half is not integrally formed with the mainshaft, but is otherwise connected to the mainshaft in such a way that the fixed half is not capable of axial motion relative to a movable half of the variator shaft, discussed in further detail below.
  • the fixed half of the variator sheave refers to a half of the variator sheave whose axial position, i.e., along the axis of rotation, is fixed.
  • One possible advantage of the variator sheave fixed half configuration of Figure 17 is that the number of moving parts is reduced, and the mainshaft and fixed half of the variator sheave can be formed as a single component.
  • the use of only a single movable half of the sheave may simplify the control and operation of the sector gear mechanism.
  • the control and actuation system for changing the configuration of the sheave only has to control and actuate a single sheave half. This configuration and arrangement may be advantageous in some circumstances.
  • the sheave configuration can be modified by axial motion of the movable half towards, or away from, the fixed half of the sheave.
  • the operating diameter of the sheave can be desirably adjusted.
  • changes to the physical sheave configuration and, more particularly, to the operating diameter of the sheave can be implemented automatically, and at desired times, by a control system and/or control mechanisms. Software and/or electronic controls may be employed to this end.
  • the variator takes the form of a sheave having a fixed half and a movable half, each of which defines two or more bridge slots. While two bridge slots are disclosed in Figures 16 and 18, more or fewer bridge slots may be employed. In some circumstances at least, the number and/or spacing of bridge slots may be selected so as to help ensure a substantially balanced distribution of weight on the sheave halves. By way of illustration, the illustrated example having two bridge slots is relatively well balanced when the bridge slots are oriented about 180 degrees apart from each other.
  • a different spacing may need to be maintained to ensure that the sheave halves are relatively well balanced.
  • a balance should be struck between both odd and even numbers of bridge slots. For example, if the number of bridge slots is 4, the spacing between slots would be 90 degrees. If the number of bridge slots were 5, the spacing between bridge slots would be 72 degrees.
  • the sheave halves may be relatively well balanced if the spacing between each of the bridge slots is about 120 degrees.
  • the bridge slots may be formed by machining, milling and/or any other suitable processes.
  • one or both halves of the variator sheave may be a cast piece formed by casting, in which case the bridge slots may be formed as part of the casting process.
  • the bridge slots extend from a point near the intersection of the mainshaft with the fixed half of the sheave to a point at, or near, an outer edge of the fixed half of the sheave.
  • the movable sheave half may be similarly configured.
  • the bridge slots may include undercuts that slidingly receive corresponding flanges of the bridges, discussed below, so that the bridges are securely retained in the bridge slots.
  • the bridge slots each include one or more valve ports by way of which lubricant can be directed by pressure and/or gravity to the bridge slots so as to ensure ready motion of the bridges, discussed below, back and forth along the bridge slots.
  • the bridge slots may be angled, relative to a horizontal position, at about the same angle as the upper surface of the sheave half.
  • a plurality of bridges may be provided, each of which includes first and second bearing surfaces slidably disposed in a respective bridge slot in each of the halves of the variator sheave.
  • Each bridge may include a flange on each side, each flange being configured to be slidingly received by the undercut of a corresponding bridge slot so that the bridge is retained in, and can slide along, the bridge slots.
  • the bridge and sector gear may be constructed such that the sector gear extends beyond the bridge slot and slides along the inner surface of the halves of the variator sheave as the bridge moves.
  • the bridges are substantially symmetric about a plane that is perpendicular to the axis of rotation and bisects the bridge.
  • the bridges may be made of any of a variety of suitable materials, including metals such as aluminum, steels or other alloys.
  • the bridges, and/or other components of Figures 16-18 may also include non-metallic materials, such as ceramics, and composites.
  • the bridges are configured and arranged for motion towards, and away from, the mainshaft, and the range of motion of the bridges is defined at least in part by the length and width of the bridge slots.
  • the maximum outward travel, i.e., away from the mainshaft, of the bridges may be defined by a stop positioned in the bridge slots.
  • the configuration and arrangement of the bridges and bridge slots which enables radial, and axial, motion of the bridges relative to the axis of rotation, thus enables the radial position of the sector gears, discussed below, to be adjusted.
  • the position of moon gears such as the sector gears for example, may be adjusted automatically to suit a particular gear ratio or gear ratio change.
  • the position or operating diameter of the sector gears may be adjusted in conjunction with adjustments to the distance that the sheaves are from each other and the operating diameter of the chain sheave.
  • a variety of considerations may inform the number and positioning of bridges employed in any particular embodiment.
  • One such consideration is the need, in some instances at least, to avoid eccentric weight distribution in the halves of the variator sheave.
  • Another consideration relating to the number and spacing of bridge slots is the possible need, in some circumstances at least, to minimize or avoid chordal action of the chain, namely, circumstances where the portion of the chain extending around the sector gears may tend to flatten somewhat, rather than describe a circular arc.
  • chordal action may contribute to inefficiency of the mechanism, slippage, and can also result in accelerated wear in the components of the sector gear, and other, mechanisms. Finally, chordal action may result in variations in tension of the chain which can lead to uneven wear and uneven stress/strain distributions in the chain.
  • the bridges each include opposing bearing surfaces angled to substantially match the angles at which the bridge slots are oriented, relative to a plane that is perpendicular to the axis of rotation.
  • FIG 18 only one bearing surface of each bridge is illustrated.
  • Each bearing surface of the bridge is slidingly received in a corresponding bridge slot of either the fixed or movable half of the variator sheave.
  • Lubricant between the bearing surfaces and the respective bridge slots helps ensure that friction and wear on the two surfaces is minimized.
  • Due to the angle of the bearing surfaces motion of the bearing surfaces of the bridge has both a radial and axial component. This is best appreciated with reference to Figure 17.
  • the angle of the bearing surfaces also helps ensure that substantial contact is maintained between the bearing surface and the bridge slot in which that bearing surface is received. This contact helps ensure the stability of the position of the sector gears and, thus, the position of the chain.
  • the bridges may each include a curved inner surface whose radius of curvature substantially matches that of the mainshaft.
  • the curved inner surface may contact the surface of the mainshaft. Lubricant flowing from the valve ports may help ensure that no undue friction or wear occurs between the bridge inner surfaces and the surface of the mainshaft.
  • the position of the bridges may be adjusted by an actuator or other system. Examples include hydraulic, mechanical, and electro-mechanical actuators and systems. In at least some embodiments, the operation of such actuators and systems is electronically monitored and controlled. Attached to each bridge is a corresponding sector gear.
  • the sector gear may be attached to the bridge by processes such as welding or brazing.
  • the sector gear and bridge are constructed, such as by machining or casting, of a single piece of material. By virtue of their attachment to respective bridges, the sector gears are able to move radially toward and away from the mainshaft as necessary to suit a gear ratio change and corresponding movement of the sheave halves.
  • the sloped orientation of the bridge slot in which the bridge is received enables axial motion of the sector gears as well.
  • the sector gears are connected to the bridges in such a way that the sector gears can move relative to their corresponding bridge.
  • one or the other of the bridge and sector gear may define a slot and/or other structure(s) that engages corresponding structure(s) of the other of the bridge and sector gear and enables the sector gear to move, such as by sliding, about the axis of rotation relative to the bridge.
  • the connection between the sector gear and its bridge is configured to limit the range of motion of the sector gear relative to the bridge.
  • the range of motion may, in some instances, be defined in terms of a number of gear teeth, or fractions of a gear tooth, of the sector gear. This range of motion of the sector gear may enable indexing of the sector gear, similar to the indexing disclosed elsewhere herein in connection with other embodiments of a moon gear.
  • the sector gears may include any number of teeth, and the teeth of the sector gear are generally configured to mate with corresponding tooth engagement structures of a driven member, or members, such as gears or the chain.
  • a driven member or members, such as gears or the chain.
  • One useful aspect of some embodiments is that the relatively small size of the sector gears and bridges enables the sector gear mechanism to be implemented in a relatively compact physical package that is nonetheless capable of implementing a relatively large number of gear ratios.
  • one of the sector gears will always be engaged with the chain, even during a gear ratio change where the geometry of the variator sheave, specifically, the operating diameter of the variator sheave, is changed.
  • the variator sheave may include a fixed half and a movable half, although the disclosed sector gear mechanism may also be employed in connection with a variator sheave having two movable halves.
  • the fixed half of the variator sheave may be positioned proximate a terminal end of the mainshaft and the movable half of the variator sheave may be positioned away from the terminal end of the mainshaft while, in other embodiments, the respective positions of the fixed and movable halves of the variator sheave may be reversed.
  • any suitable position and location of the variator sheave halves may be employed, and embodiments are not confined to any particular position or location.
  • the inner surfaces of one or both of the halves of the variator sheave, including the bridge slots, may include one or more lubrication channels, or similar structures, that enable lubricant to be directed to those inner surfaces.
  • the lubrication channels may be separate from, or include, the lubrication ports discussed above in connection with the bridge slots. Such lubrication may help to minimize friction and wear between those inner surfaces and the bridges and sector gears.
  • the movable half of the variator sheave is configured and arranged for axial motion relative to the fixed half of the variator sheave.
  • the movable half includes a sleeve portion through which the mainshaft passes.
  • this configuration and arrangement permits the movable half to slide axially along the mainshaft. Because the fixed half of the variator sheave is fixed to the mainshaft, the aforementioned configuration and arrangement thus permits changes to the axial position of the movable half relative to the fixed half of the variator sheave. Consequently, the operating diameter of the variator sheave can be readily adjusted by moving the movable half towards, or away from, the fixed half of the variator sheave.
  • the mainshaft may include a shoulder configured and arranged to contact a corresponding shoulder of the sleeve portion so as to limit the axial travel of the movable half of the variator sheave toward the fixed half of the variator sheave.
  • this arrangement may prevent pinching of the chain by the sheave halves.
  • any other mechanism(s) or structure(s) for limiting or defining a range of motion of the movable half of the variator sheave relative to the fixed half of the variator sheave may alternatively be employed.
  • the shoulder configuration of the mainshaft and sleeve portion is one example of a structural implementation of a means for limiting axial travel of a sheave half.
  • the sleeve portion is externally threaded and received in, and engaged by, a bearing sleeve that is internally threaded.
  • Axial motion of the movable half of the variator sheave relative to the fixed half of the variator sheave may be effected in a variety of ways, including axial movement of the bearing sleeve and/or advancement of the sleeve portion into or out of the bearing sleeve. More generally however, any mechanism effective in changing the distance between the halves of the variator sheave, so as to modify the operating diameter of the variator sheave, may be employed.
  • a sector gear engagement drive or, more generally, a sector gear mechanism.
  • the sector gear mechanism moon gears are implemented as sector gears rather than in the form of full circular gears.
  • At least some embodiments of the sector gear mechanism operate only in the integer modes, namely, I and IN disclosed elsewhere herein.
  • the sector gears do not disengage from the chain during gear ratio changes, i.e., shifts. Thus, a change from one gear ratio to another must occur during a fixed number of revolutions of the mainshaft in order to maintain the mechanism in one of the integer modes.
  • one or more of the sector gears and bridges may be configured to enable clockwise and/or counterclockwise indexing of one or more of the sector gears.
  • the operating diameter of the sheave In order to effect a gear ratio change, the operating diameter of the sheave must be adjusted by changing the axial position of the movable sheave half, and positions of the bridges must adjusted correspondingly.
  • the movable sheave half if the operating diameter of the sheave is to be decreased in connection with a gear ratio change, the movable sheave half must be advanced toward the fixed sheave half and, at substantially the same time, the bridges must be moved axially in a direction toward the mainshaft.
  • the presence of the bridge slots enables the bridges to move toward or away from the mainshaft as the sheave configuration changes. That is, the bridge movement may occur in unison, or is otherwise synchronized, with changes to the sheave configuration, i.e., operating diameter.
  • adjustment of the sheave diameter and movement of the bridges may be accomplished with a single actuator.
  • the single actuator configuration may greatly reduce the complexity of the structure and operation of the sector gear mechanism.
  • the bridge moves outward, for example, it carries the sector gear and chain along and may support the chain in such a way as to minimize any chordal action of the chain.
  • Example integer (I or I ) operation shift sequence (sector gear mechanism):
  • Prime mover e.g., engine, motor etc.
  • Controller e.g., transmission controller
  • sheave width actuator directs sheave width actuator to change the position of the movable half of the sheave.
  • the controller may direct the sector gear actuator to index the sector gear to a new position for chain engagement.
  • a CVT which may or may not be implemented and/or operate as a locking CVT, may employ one or more sector gears to drive one or more elements such as gears, or a chain
  • the embodiment of Figure 19 includes one or more bridges (denoted as a 'moon bridge' in Figure 19). Generally, a corresponding bridge is provided for each sector gear (denoted as a 'crescent moon' in Figure 19).
  • a stepping motor (1) is provided that is configured and arranged to rotate a worm gear (2).
  • the stepping motor(s) may be electrically powered, and can be controlled through the use of an electronic control system which may include, among other things, a feedback loop.
  • the feedback loop may be connected with sensors configured to ascertain the position of a sector gear associated with the stepping motor, and may make corresponding adjustments to the position of the sector gear using the stepping motor, as described in more detail below.
  • the worm gear is engaged with, or engageable with, corresponding structure(s) attached to, or engaged with, the sector gear such that rotation of the worm gear by the stepping motor results in a desired movement of the sector gear.
  • Such movement may include, as noted in the discussion of Figures 16-18, a movement about the mainshaft axis of rotation relative to the bridge.
  • the worm gear engages one or more angled engagement members (3) attached to the sector gear such that rotation of the worm gear causes a corresponding movement of the sector gear in one of the directions indicated by the arrows.
  • the angular engagement members (3) are disposed at an angled side relative to the sector gear.
  • the worm gear rotates in such a way that it moves the engagement members (3) relative to the sector gear so as to cause the sector gear to tilt about its axis relative to the bridge, i.e., it causes the sector gear to rotate in the direction(s) indicated by the arrows.
  • the position of the sector gear can be adjusted so as to reduce, or eliminate, the partial tooth or partial integer problem.
  • Other aspects of the structure and operation of the embodiment of Figure 19 are similar, if not the same as, those of the embodiment of Figures 16-18. N. Adjustable Idler/Tensioner
  • Figures 20-22 details are provided concerning an example application of selected concepts disclosed herein.
  • Figures 20 and 21 disclose a variator configuration, examples of which are discussed above.
  • provision of an idler/tensioner assembly as shown serves to compensate for any acceleration or deceleration in a device such as a turbine whose output is connected to the variator.
  • windmills and wind turbines are routinely exposed to wind speeds and forces that can vary significantly over relatively short periods of time. These variations, coupled with the inertia of the turbine/windmill blade, can produce rapid accelerations and decelerations in the gears of a gear train to which the windmill or turbine is connected. Not only do such variations impose great stresses on the gear trains and other components, but the output of the gear trains over time can vary significantly.
  • water operated turbines such as are used in some coastal areas with significant tidal changes, i.e., the relatively rapid and large tidal changes can have a variety of negative effects on turbines intended to harness the tidal energy.
  • the embodiment of Figures 20-22 can increase the life of associated components such as gear trains, while also enabling the use of components such as synchronous generators which otherwise would not be practical.
  • a gear ratio change may involve a shift from one whole integer ratio to another whole integer ratio.
  • a change in ratio from one whole integer to another can result in a torque spike in the primary drive train.
  • the tensioner(s) may help address this situation by increasing somewhat the amount of time required to implement a gear ratio change, thereby permitting elements of an associated engine, such as fuel injectors, control systems, or other elements, to act during the shift window to accelerate, or decelerate, the engine output.
  • the use of one or more tensioners on the input and/or output sides may help to smooth out, reduce, or substantially eliminate at least some torque spikes that might otherwise result from a gear ratio change, particularly a whole integer to whole integer gear ratio change.
  • the amount of force necessary to hold a chain or comparable member in a circle on a sheave may be about one-third of that required to also transfer torque by the same means.
  • embodiments of the transmission are expected to be more than adequate in terms of the durability of the sheave and chain.
  • the means by which the sheaves are controlled may be conventional means of established durability.
  • embodiments of a chain that can be used in connection with a transmission may include a structure that contributes to the longevity of the chain and associated components, such as moon gears for example, where one or more moon gears can form elements of a sprocket.
  • This longevity may be achieved in connection with the way that the chain interacts with the moon gears. More specifically, when the chain is traveling in a straight line, the adjoining links create a relatively larger opening (A) to receive a sprocket tooth.
  • A opening
  • the tooth of the sprocket has a relatively larger fillet to engage.
  • the crescent, or sector, moon gear and sled are integrally formed with each other, such as by casting or machining for example, to be a single piece of material.
  • the number of wear points may be reduced, since there is no movement of the gear relative to the sled, but only movement of the sled relative to the slot in which it is positioned. This configuration may thus contribute to a relative increase in longevity of these components and an associated transmission.
  • Figure 25 discloses three examples of a rocker pin profile and pin placement for a chain. These are three of many different profiles that could be used on the rocker pins. Each profile could provide benefits as to how the chain tooth engages the sprocket at different radii of the chain. It will be appreciated that the rocker pin profile and pin placement may affect the profile of the chain and sprocket teeth. For example, the placement of the pin within the link would change the radial pivot of the chain tooth. By way of illustration, the right pin on the link in Figure 25 could be placed anywhere along the line "B".
  • 'Appendix A' attached hereto, and forming a part of the present disclosure discloses aspects of various example embodiments that implement one or more of the concepts disclosed herein.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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PCT/US2013/032461 2011-03-22 2013-03-15 Locking continuously variable transmission (cvt) WO2013142368A1 (en)

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EP13764640.2A EP2828553A1 (de) 2012-03-22 2013-03-15 Stufenloses getriebe mit verriegelung
US14/198,535 US20140248981A1 (en) 2011-03-22 2014-03-05 Moon gear and sled arrangement for multiple whole-integer virtual circles

Applications Claiming Priority (4)

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US13/427,354 US20120238384A1 (en) 2009-09-08 2012-03-22 Locking continuously variable transmission (cvt)
US13/427,354 2012-03-22
US201361775307P 2013-03-08 2013-03-08
US61/775,307 2013-03-08

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Cited By (2)

* Cited by examiner, † Cited by third party
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WO2015134629A1 (en) * 2014-03-05 2015-09-11 Vmt Technologies, Llc Synchronized shift transmission
WO2015134512A1 (en) * 2014-03-05 2015-09-11 Vmt Technologies, Llc Moon gear and sled arrangement for multiple whole-integer virtual circles

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US4005618A (en) * 1975-09-29 1977-02-01 Sphero International Co. Transmission with continuously variable speed ratio
US5295915A (en) * 1991-10-19 1994-03-22 Luk Lamellen Und Kupplungsbau Gmbh Continuously variable speed transmission
US6050912A (en) * 1996-07-16 2000-04-18 Nissan Motor Co., Ltd. Continuously variable transmission that changes axial thurst based on transmission ratio
US20110306457A1 (en) * 2009-09-08 2011-12-15 Vmt Technologies, Llc Moon gear assembly

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Publication number Priority date Publication date Assignee Title
US4005618A (en) * 1975-09-29 1977-02-01 Sphero International Co. Transmission with continuously variable speed ratio
US5295915A (en) * 1991-10-19 1994-03-22 Luk Lamellen Und Kupplungsbau Gmbh Continuously variable speed transmission
US6050912A (en) * 1996-07-16 2000-04-18 Nissan Motor Co., Ltd. Continuously variable transmission that changes axial thurst based on transmission ratio
US20110306457A1 (en) * 2009-09-08 2011-12-15 Vmt Technologies, Llc Moon gear assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015134629A1 (en) * 2014-03-05 2015-09-11 Vmt Technologies, Llc Synchronized shift transmission
WO2015134512A1 (en) * 2014-03-05 2015-09-11 Vmt Technologies, Llc Moon gear and sled arrangement for multiple whole-integer virtual circles

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