WO2014172422A1 - Continuously variable transmission - Google Patents
Continuously variable transmission Download PDFInfo
- Publication number
- WO2014172422A1 WO2014172422A1 PCT/US2014/034300 US2014034300W WO2014172422A1 WO 2014172422 A1 WO2014172422 A1 WO 2014172422A1 US 2014034300 W US2014034300 W US 2014034300W WO 2014172422 A1 WO2014172422 A1 WO 2014172422A1
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- WO
- WIPO (PCT)
- Prior art keywords
- axis
- bicycle
- cvt
- traction
- carrier member
- Prior art date
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 86
- 230000007246 mechanism Effects 0.000 claims description 28
- 238000004891 communication Methods 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 description 31
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/48—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members with members having orbital motion
- F16H15/50—Gearings providing a continuous range of gear ratios
- F16H15/52—Gearings providing a continuous range of gear ratios in which a member of uniform effective diameter mounted on a shaft may co-operate with different parts of another member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/55—Rider propelled cycles with auxiliary electric motor power-driven at crank shafts parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/60—Rider propelled cycles with auxiliary electric motor power-driven at axle parts
Definitions
- This disclosure relates generally to transmissions, and more particularly to continuously variable transmissions (CVTs). Even more particularly, embodiments disclosed herein relate to CVTs useful in any machine, device, vehicle, etc., where it is desired to adjust the ratio of input speed to output speed, and to methods for controlling CVTs, including automatically controlling CVTs.
- CVTs continuously variable transmissions
- the drivetrain of a bicycle typically consists of pedals coupled to cranks for driving a crankshaft, which is received in, and supported by, frame members of the bicycle typically referred to as the "bottom bracket.”
- the crankshaft is coupled to a sprocket that transfers power to the rear wheel of the bicycle by a chain.
- a cog at the rear wheel receives power from the chain and is adapted to interface with the rear wheel hub for driving the rear wheel of the bicycle.
- Some bicycles are provided with internally geared rear hubs, where a set of gears is arranged to receive power from the cog and drive the rear wheel.
- a bicycle is provided with a CVT at the rear hub to drive the rear wheel.
- the embodiments of the CVTs disclosed here address needs in the field of continuously variable transmissions.
- An electric motor producing variable speed and constant power is highly desired in some vehicle and industrial uses.
- torque and speed vary inversely.
- Some electric motors can provide constant power above their rated power; for example, a 1750 rpm AC motor can provide constant power when speed increases above 1750 rpm because torque can be designed to decrease proportionally with the speed increase.
- a motor by itself cannot produce constant power when operating at a speed below its rated power. Frequently torque remains constant or even decreases as the motor speed decreases.
- Controllers can be used to increase current, and torque, into the electric motor at low speeds, but an increase in the wire diameter of the windings is required to accommodate the additional current to avoid overheating.
- One aspect of the disclosure relates to a bicycle having a number of bicycle frame members and a crankshaft operationally coupled to one or more cranks.
- the crankshaft substantially defines a crank axis.
- the bicycle can have a continuously variable transmission (CVT) coupled to the crankshaft.
- the CVT has a group of traction planets arranged angularly about a longitudinal axis of the CVT. Each traction planet is adapted to rotate about a tiltable axis.
- the CVT also has a first carrier member with a number of radially offset slots formed in the first carrier member and arranged angularly about the longitudinal axis.
- the CVT is provided with a second carrier member having a number of radial slots formed in the second carrier member and arranged angularly about the longitudinal axis. In some embodiments, the slots in the second carrier member may also be radially offset.
- the second carrier member can be coupled to the first carrier member.
- the first and second carrier members are operably coupled to each traction planet.
- the first carrier member is configured to rotate angularly relative to the second carrier member about the longitudinal axis.
- the CVT can also have a traction ring in contact with each traction planet. In some embodiments, the traction ring is located radially outward of each traction planet.
- the CVT has first and second sun members in contact with each traction planet. In some embodiments, the first and second sun members are located radially inward of the traction ring.
- the bicycle can have an electric motor operably coupled to the CVT.
- CVT continuously variable transmission
- the CVT has a traction ring in contact with each traction planet.
- the traction ring is located radially outward of each traction planet.
- the CVT has first and second sun members in contact with each traction planet.
- the first and second sun members are located radially inward of the traction ring.
- the first sun member and the traction ring are adapted to receive a rotational power.
- the CVT also has a carrier assembly having first and second carrier plates.
- the first carrier plate is a substantially disc shaped body having a center arranged coaxially with the main drive axis.
- the first carrier plate has a number of radially offset slots arranged angularly about the center.
- Each of the radially offset slots is parallel with, and has a linear offset from, a radial centerline of the disc shaped body.
- the centerline of the disc shaped body is perpendicular to the main drive axis thereby forming a coordinate system.
- the coordinate system has a z-axis corresponding to the main drive axis, a y-axis corresponding to the radial centerline, and an x-axis perpendicular to the y-axis and z-axis.
- the radially offset slots lie in a plane formed by the x-axis and y-axis.
- Each traction planet is adapted to tilt in a plane formed by the y-axis and z-axis.
- Yet another aspect of the disclosure concerns a continuously variable transmission having a housing coupled to a bottom bracket of a bicycle.
- the transmission has a group of spherical traction planets arranged angularly about a longitudinal axis.
- the transmission can have a traction ring in contact with each traction planet.
- the traction ring is located radially outward of each traction planet.
- the transmission has first and second sun members in contact with each traction planet.
- the first and second sun members are located radially inward of the traction ring.
- the first sun member and the traction ring are adapted to receive a rotational power.
- the transmission also has a carrier assembly provided with a first generally disc-shaped body having a first center and a second generally disc-shaped body having a second center arranged coaxially with respect to the first center thereby forming a main axis.
- the first generally disc-shaped body can have a number of radially offset slots formed on and arranged angularly about the center of the first disc-shaped body. Each of the radially offset slots has a linear offset from a centerline of the first disc shaped body.
- the centerline of the first disc shaped body is perpendicular to the main axis thereby forming a coordinate system, the coordinate system having a z-axis corresponding to the main axis, a y-axis corresponding to the radial centerline, and an x-axis perpendicular to the y-axis and z-axis.
- the radially offset slots lie in a plane formed by the x-axis and y-axis.
- the "radially offset slots" are slots that are formed in the carrier member parallel with a radius of the carrier member but are formed some distance offset from the radius so that their respective axes do not intersect with the radial center of the carrier.
- the transmission can include an electric motor coupled to the traction ring.
- the electric motor is coaxial about the longitudinal axis.
- the electric motor is located within the interior of the housing.
- Still another aspect of the disclosure is directed to an electric drivetrain for a bicycle having a continuously variable transmission (CVT) with a longitudinal axis.
- the CVT has a group of traction planets adapted to rotate about a tiltable axis.
- the CVT can have a traction ring in contact with each traction planet.
- the traction ring is located radially outward of each traction planet.
- the CVT is provided with first and second sun members in contact with each traction planet.
- the first and second sun members are located radially inward of the traction ring.
- the CVT is provided with first and second axial force generators coupled to the first and second sun members, respectively.
- the CVT includes a first carrier member having a number of radially offset slots formed in the first carrier member and arranged angularly about the longitudinal axis.
- the CVT has a second carrier member having a number of radial slots formed in the second carrier member and arranged angularly about the longitudinal axis.
- the second carrier member is coupled to the first carrier member.
- the first and second carrier members are operably coupled to each traction planet.
- the first carrier member is configured to rotate relative to the second carrier member about the longitudinal axis.
- the drivetrain also includes a shifter operably coupled to the CVT. In some embodiments, the shifter is adapted to apply a skew condition to the CVT to tilt the axes of the traction planets.
- the drivetrain has an electric motor operably coupled to the traction ring.
- the disclosure addresses a method of automatically controlling a ball-planetary transmission of a bicycle.
- the method involves receiving an input associated with a target user pedaling speed, determining a speed of the bicycle, and determining a target transmission ratio based at least in part on the target user pedaling speed and the determined speed of the bicycle.
- the method can also include adjusting a transmission ratio of the transmission to be substantially equal to the target transmission ratio.
- the method further includes the step of determining an encoder position associated with the target user pedaling speed.
- adjusting a transmission ratio includes commanding an actuator to move to the determined encoder position.
- adjusting a shift drum includes the step of rotating a shift rod about a longitudinal axis of the transmission.
- the disclosure is directed to a method of automatically controlling a ball-planetary transmission of a bicycle.
- the method includes receiving an input associated with a target user pedaling speed, determining a speed of the bicycle, and based upon the target user pedaling speed and the determined speed of the bicycle, adjusting a speed ratio of the bicycle to maintain a user pedaling speed within a band of the target user pedaling speed.
- the band is the target user pedaling speed plus or minus 10 revolutions-per-minute (rpm). In other embodiments, the band is the target user pedal speed in the range of +1-2 rpm to about +/- 5 rpm.
- adjusting a speed ratio of the bicycle includes the step of determining an encoder position associated with the target user pedaling speed and the determined speed of the bicycle. In some embodiments, adjusting a speed ratio of the bicycle includes the step of commanding an actuator to move to the determined encoder position. In other embodiments, adjusting a speed ratio of the bicycle includes the step of adjusting a shift rod of the transmission. In some embodiments, adjusting the shift rod includes the step of rotating the shift rod about a longitudinal axis of the transmission.
- Yet another aspect of the disclosure relates to a method of automatically controlling a ball-planetary transmission of a bicycle.
- the method involves providing an input associated with a target user pedaling speed, determining a speed of the bicycle, and identifying a target encoder position associated with the speed of the bicycle.
- the method can further include actuating a servo to achieve the target encoder position.
- actuating a servo includes the step of adjusting a shift rod of the transmission.
- identifying the target encoder position includes generating a data structure.
- generating a data structure includes the step of recording an encoder position.
- generating a data structure includes the steps of recording an input speed and recording an output speed.
- the method includes the step of determining a speed ratio based at least in part on the input speed and the output speed.
- the method includes the step of recording the speed ratio.
- the disclosure is concerned with a system for automatically shifting a ball-planetary bicycle transmission.
- the system includes a speed sensor configured to detect a speed of the bicycle, a processor configured to receive input from the speed sensor, and a data input interface configured to provide cadence data to the processor, the cadence data indicative of an input pedaling speed.
- the system can additionally have a memory in communication with the processor, the memory having stored therein one or more maps correlating bicycle speeds with speed ratios.
- the system includes a logic module in communication with the processor, the logic module configured to cooperate with the processor to determine from the maps a target speed ratio based on a bicycle speed and an input pedaling speed.
- the system has an actuator, in communication with the processor, the actuator configured to adjust a speed ratio of the transmission to be substantially equal to the determined target speed ratio.
- the control unit includes at least one of a processor, an application specific integrated circuit, or a programmable logic array.
- the actuator is operably coupled to a shift rod of the transmission, the shift rod configured to adjust the speed ratio of the transmission.
- the data input interface can include a display and at least one button.
- the system can include a position sensor configured to provide an indication of a position of the actuator.
- the data structures can include a speed ratio data structure and a bicycle speed data structure.
- the system can have a power source configured to supply a power to the actuator.
- the power source is a dynamo.
- the actuator is operably coupled to a shift rod of the transmission.
- the system has a speed sensor configured to detect a speed of the bicycle.
- the system has a processor configured to receive input from the speed sensor.
- the system includes a data input interface configured to provide cadence data to the processor. The cadence data is indicative of an input pedaling speed.
- the system can include a memory in communication with the processor.
- the memory has stored therein one or more maps correlating bicycle speeds with speed ratios.
- the system includes a logic module in communication with the processor.
- the logic module is configured to cooperate with the processor to determine from the maps a target speed ratio based on a bicycle speed and an input pedaling speed.
- the system can also include an actuator in communication with the processor.
- the actuator is configured to adjust a speed ratio of the transmission to be substantially equal to the determined target speed ratio.
- the data input interface includes a display and at least one button.
- the data input interface is mounted on a handlebar of the bicycle.
- the bicycle can include a position sensor configured to provide an indication of a position of the actuator.
- the data structures have a speed ratio data structure and a bicycle speed data structure.
- the ball-planetary transmission includes a shift rod, the shift rod operably coupled to the actuator.
- control mechanisms for CVTs are disclosed that are configured to rotate the net position of the two carrier members during a control movement.
- the sun may be an idler and the traction rings may provide power through contact patches with the traction planets, or vice versa.
- the sun member and the traction ring may be adapted to receive a rotational power.
- the carrier assembly may include a first carrier member having a first center, a second carrier member having a second center arranged coaxially with respect to the first center thereby forming a main axis, and a plurality of radially offset slots formed on and arranged angularly about the center of the first carrier member, each of the radially offset slots having a linear offset from a centerline of the first carrier member, as described with other embodiments above and herein.
- the control mechanism is configured to rotate each of the first carrier member and the second carrier member about the main axis at a different rate.
- the control mechanism comprises a rotatable gear structure having a first gear for engagement with the first carrier member and a second gear for engagement with the second carrier member.
- the control mechanism is configured to rotate each of the first carrier member and the second carrier member about the main axis at a variable rate.
- the control mechanism comprises a double cam structure having a first cam surface for contact with the first carrier member and a second cam surface for engagement with the second carrier member.
- the first cam surface has a first magnitude and a first axis of eccentricity and the second cam surface has a second magnitude and a second axis of eccentricity, wherein the variable rate is determined based on the first magnitude, the second magnitude, the first axis of eccentricity and the second axis of eccentricity.
- the first axis of eccentricity is angularly offset from the second axis of eccentricity.
- one or more of the first axis of eccentricity and the second axis of eccentricity is angularly offset from a zero plane associated with the longitudinal axis.
- Figure 1 is cross sectional view of a CVT adapted to couple to cranks of a bicycle.
- Figure 2 is a partial cross-sectional perspective view of the CVT of Figure 1 coupled to an electric drive motor assembly.
- Figure 3 is a perspective view of an electric drivetrain having the CVT of Figure 1.
- Figure 4 is a cross-sectional view of an embodiment of an integrated electric motor and CVT.
- Figure 5A is a cross-sectional perspective view of the CVT of Figure 1.
- Figure 5B is a perspective view of a carrier plate and shifter assembly that can be used with the CVTs of Figure 1 and/or Figure 4.
- Figure 6 is a schematic illustration of a bicycle having an electric motor and CVT coupled to a crank.
- Figure 7 is a schematic illustration of a bicycle having an electric motor coaxial with a crank of the bicycle and a CVT coupled to and offset from the crank.
- Figure 8 is a schematic illustration of a bicycle having an electric motor coaxial with, and coupled to, a CVT, the motor and CVT coaxial with and coupled to a crank of the bicycle.
- Figure 9 is a schematic illustration of a bicycle having an electric motor coupled to, and offset from, a crank of the bicycle, and a continuously variable transmission coaxial with, and coupled to, the crank.
- Figure 10 is a schematic illustration of a bicycle having an electric motor coaxial with, and coupled to a CVT, the CVT coaxial with and coupled to a rear wheel of the bicycle.
- Figure 1 1 is an exploded perspective view of a pair of carrier members and a shifting mechanism.
- Figure 12 is a cross-sectional perspective view of a transmission including a planetary gear set.
- Figure 13 schematically depicts a portion of a transmission including two stator plates and a rotatable gear structure in contact with each of the carrier members.
- Figure 14 shows a perspective view of a multi-diameter gear structure.
- Figure 15 shows an opposite perspective view of the multi-diameter gear structure of Figure 14.
- the terms “operationally connected,” “operationally coupled,” “operationally linked,” “operably connected,” “operably coupled,” “operably linked,” and like terms refer to a relationship (mechanical, linkage, coupling, etc.) between elements whereby operation of one element results in a corresponding, following, or simultaneous operation or actuation of a second element. It is noted that in using these terms to describe inventive embodiments, specific structures or mechanisms that link or couple the elements are typically described. However, unless otherwise specifically stated, when one of said terms is used, the term indicates that the actual linkage or coupling may take a variety of forms, which in certain instances will be readily apparent to a person of ordinary skill in the relevant technology.
- radial is used here to indicate a direction or position that is perpendicular relative to a longitudinal axis of a transmission or variator and extends radially outward from a center point when describing a disc.
- axial refers to a direction or position along an axis that is parallel to a main or longitudinal axis of a transmission or variator. For clarity and conciseness, at times similar components are labeled similarly.
- Traction drives usually involve the transfer of power between two elements by shear forces in a thin fluid layer trapped between the elements.
- the fluids used in these applications usually exhibit traction coefficients greater than conventional mineral oils.
- the traction coefficient ( ⁇ ) represents the maximum available traction forces which would be available at the interfaces of the contacting components and is a measure of the maximum available drive torque.
- friction drives generally relate to transferring power between two elements by frictional forces between the elements.
- CVTs and IVTs described herein may operate in both tractive and frictional applications.
- the IVT can operate at times as a friction drive and at other times as a traction drive, depending on the torque and speed conditions present during operation.
- Embodiments of the disclosure can be related to the control of a variator using generally spherical planets each having a tiltable axis of rotation (sometimes referred to here as a "planet axis of rotation”) that can be adjusted to achieve a desired ratio of input speed to output speed during operation.
- adjustment of the axis of rotation involves angular misalignment of the planet axis in a first plane in order to achieve an angular adjustment of the planet axis of rotation in a second plane, thereby adjusting the speed ratio of the variator.
- the angular misalignment in the first plane is referred to here as “skew” or “skew angle.”
- This type of variator control is generally described in United States Patent Application Nos.
- a control system coordinates the use of a skew angle to generate forces between certain contacting components in the variator that will tilt the planet axis of rotation in the second plane.
- the tilting of the planet axis of rotation adjusts the speed ratio of the variator.
- FIG. 1 shows a CVT 1 that can be used in many applications including, but not limited to, automobiles, light electrical vehicles, hybrid human-, electric-, or internal combustion powered vehicles, industrial equipment, wind turbines, etc. Any technical application that requires modulation of mechanical power transfer between a power input and a power sink (for example, a load) can implement embodiments of the CVT 1 in its power train.
- a power sink for example, a load
- a CVT 1 can be operably coupled to a set of bicycle cranks 2.
- the bicycle cranks 2 are coupled to a crankshaft 4 configured to rotate about a crank axis 6.
- the CVT 1 is provided with a number of spherical traction planet assemblies 8, including traction planets, arranged angularly about a longitudinal axis.
- the longitudinal axis of the CVT 1 is coaxial with the crank axis 6.
- the longitudinal axis of the CVT 1 can be radially offset from the crank axis 6.
- Each traction planet assembly 8 is supported by first and second carrier members 10, 12, respectively.
- the second carrier member 12 is operably coupled to the first carrier member 10, and the first and second carrier members 10, 12 are coupled to each traction planet.
- the second carrier member 12 can include a plurality of radial slots formed in the second carrier member 12 and arranged angularly about the longitudinal axis of the CVT 1.
- the first carrier member 10 is operably coupled to a control mechanism, which may include shifter 14.
- the shifter 14 is located radially outward of the traction planet assemblies 8 and is operably coupled to a transmission housing 16.
- the CVT 1 is provided with a traction ring 18 in contact with, and radially outward of each traction planet assembly 8.
- Each traction planet assembly 8 is in contact with first and second sun members 20, 22, respectively.
- the first and second sun members 20, 22 are located radially inward of the traction ring 18.
- the first sun member 20 is operably coupled to a first axial force generator 24.
- the first axial force generator 24 includes a set of rollers on cam ramps that are adapted to provide axial force dependent upon torque and/or speed during operation of the CVT 1.
- the second sun member 22 can be operably coupled to a second axial force generator 26.
- a torque sensor 28 is coupled to the crankshaft 4 and the first axial force generator 24.
- the CVT 1 can be operably coupled to an electric motor 30 via a gear set 32.
- the gear set 32 can be provided with a drive gear 34 in contact with a ring gear 36.
- the ring gear 36 can be fixedly attached to the traction ring 18.
- the ring gear 36 is coupled to the traction ring 18 through a one-way roller clutch that enables a user to pedal the bicycle with the motor off.
- the ring gear 36 is located on the interior of the housing 16 while the drive gear 34 is located substantially on the exterior of the housing 16 and couples to the ring gear 36 through an opening in the housing 16.
- the motor 30 has a drive axis 31 that is radially offset from, and parallel to, the crank axis 6. In other embodiments, the drive axis 31 of the motor 30 and the crank axis 6 of the crankshaft 4 are coaxial.
- a user applies a rotational power input to the crankshaft 4 via the cranks 2.
- the crankshaft 4 delivers power to the traction planet assemblies 8 via the first sun member 20.
- the motor 30 applies a rotational power input to the traction ring 18 through the ring gear 36 and the gear set 32.
- the CVT 1 combines the power from the two sources and delivers an output power to a sprocket 38 through the second sun member 22.
- a change in the ratio of the input to output can be achieved by varying the ratio of the CVT 1.
- the ratio of the CVT 1 is adjusted by a relative rotation of the first carrier member 10 with respect to the second carrier member 12.
- the first carrier member 10 is rotatable and the second carrier member 12 is fixed to the housing 16.
- the first carrier member 10 is rotatable in relation to the second carrier member 12, and second carrier member 12 is rotatable in relation to the fixed housing 16.
- a mechanism can be configured to control the relationship between the first and second carrier members 10, 12. The mechanism is rotatable in relation to the fixed housing 16, and rotatable in relation to the first carrier member 10 at a different ratio than it is rotatable in relation to the second carrier member 12.
- an integrated electrical drivetrain 40 can be mounted on the bottom bracket of a bicycle and operably coupled to a set of cranks 42.
- the cranks 42 couple to a crankshaft 44 configured to rotate about a crank axis, which in the illustrated embodiment is coaxial with a longitudinal axis 46.
- the drivetrain 40 includes a motor 48 having a drive axis and a CVT 50 having a longitudinal axis 46.
- the drive axis of the motor 48 is also coaxial with the longitudinal axis 46 of the CVT.
- the motor 48 and the CVT 50 are substantially enclosed by a housing 51.
- the CVT 50 may be substantially similar to the CVT 1. For description purposes, only the differences between CVT 50 and CVT 1 will be addressed.
- the motor 48 is operably coupled to the crankshaft 44.
- the crankshaft 44 is adapted to receive a rotational input power from the cranks 42 and the motor 48.
- the motor 48 couples to the crankshaft 44 through a one-way roller clutch.
- the input power is transferred to the CVT 50 through a first axial force generator assembly 52 and a first sun member 54.
- the CVT 50 can be provided with a torque sensor 58 operably coupled to the first axial force generator assembly 52.
- the CVT 50 has a second sun member 60 in contact with each traction planet assembly 8.
- the second sun member 60 is operably coupled to an output driver 62 through a second axial force generator.
- the output driver 62 couples to a drive sprocket 64.
- a rotational power input is transmitted to the crankshaft 44 from the cranks 42.
- a second source of rotational power can be transmitted to the crankshaft 44 from the motor 48.
- the power from each source is transmitted to the first sun member 54 through the torque sensor 58 and the first axial force generator assembly 52.
- the ratio of input torque and/or speed to output torque and/or speed can be adjusted by tilting the rotational axis of the traction planet assemblies 8.
- the traction planet assemblies 8 can be tilted by relative rotation of a first carrier member 66 with respect to a second carrier member 68.
- Modulated power can be transmitted out of the CVT 50 through the second sun member 60.
- the second sun member 60 transmits power to the sprocket 64 through the output driver 62.
- the motor 48 can be coupled to any component of the CVT 50.
- the crankshaft 44 can be operably coupled to any component of the CVT 50. Combinations of input power couplings and output power couplings are discussed in U.S. Patent No. 7,01 1 ,600, which is hereby incorporated by reference herein. In some embodiments, the integrated motor or generator electrical components described in U.S. Patent No. 7,727,101 are incorporated.
- the shifter 14 can be similar to the shifters described in U.S. Patent No. 8,360,917, or that of International Publication No. WO 2010/017242 Al , the entire disclosures of which are hereby incorporated by reference herein.
- the shifter 14 can be provided with cable channels 70 that can receive control cables from the bicycle (not shown).
- the shifter 14 couples to a shift drum 72 with splines 74.
- the splines 74 engage mating splines 76 provided on the shifter 14.
- an end of the shift drum 74 has an eccentric, offset follower 78.
- the follower 78 can be received in the carrier member 10, for example, in a slot 80.
- the shifter 14 can be used to rotate the shift drum 72 to thereby guide the follower 78 in the slot 80 resulting in a rotation of the carrier member 10.
- the carrier member 10 is provided with a number of radially offset slots 82.
- the radially offset slots 82 have a parallel but linear offset from a radial centerline of the first carrier member 10.
- the radial centerline of the first carrier member 10 is perpendicular to the longitudinal axis 6.
- a coordinate system having a z-axis corresponding to the longitudinal axis 6, a y-axis corresponding to the radial centerline, and an x-axis perpendicular to the y-axis and z-axis can be used to describe the location of the radially offset slots 82 on the first carrier member 10.
- the radially offset slots 82 lie in a plane formed by the x-axis and y-axis.
- Each traction planet is adapted to tilt in a plane formed by the y-axis and z-axis. Additional details are provided in U.S. Patent Application No. 12/198,402 (corresponding to U.S. Publication No. 2010/0056322) and U.S. Patent No. 8,167,759, the disclosures of which are incorporated by reference herein in their entirety.
- the second carrier member 12 may include slots that are radially offset from its radii as well.
- the second carrier member 12 can be coupled to a second shift drum (not shown) that is substantially similar to the shift drum 72.
- a lever mechanism can be arranged to rotate either or both of the first and second carrier members 10, 12 to thereby facilitate a change in ratio of the CVT.
- a bicycle 90 can be provided with a bottom bracket crankshaft 92 and sprocket 94.
- the crankshaft 92 is operably coupled to an electric drivetrain having a motor 96 and a CVT 98.
- the motor 96 has a drive axis that is radially offset from a crank axis of the crankshaft 92.
- the CVT 98 has a longitudinal axis that is radially offset from the crank axis of the crankshaft 92.
- a bicycle 100 can be provided with a bottom bracket crankshaft 102 and sprocket 104.
- the crankshaft 102 is operably coupled to an electric drivetrain having a motor 106 and a CVT 108.
- a drive axis of the motor 106 and a crank axis of the crankshaft 102 are coaxial.
- the CVT 108 has a longitudinal axis that is radially offset from the crank axis of the crankshaft 102.
- a bicycle 1 10 can be provided with a bottom bracket crankshaft 1 12 and sprocket 1 14.
- the crankshaft 1 12 is operably coupled to an electric drivetrain having a motor 1 16 and a CVT 1 18.
- the motor 1 16 has a drive axis that is radially offset from a crank axis of the crankshaft 1 12.
- a longitudinal axis of the CVT 1 18 and a crank axis of the crankshaft 1 12 are coaxial.
- a bicycle 120 can be provided with a bottom bracket crankshaft 122 and sprocket 124.
- the crankshaft 122 is operably coupled to an electric drivetrain having a motor 126 and a CVT 128.
- a drive axis of the motor 126 and a crank axis of the crankshaft 122 are coaxial.
- a longitudinal axis of the CVT 128 and a crank axis of the crankshaft 122 are coaxial.
- a bicycle 130 can be provided with a bottom bracket crankshaft 132 and sprocket 134.
- the crankshaft 132 is operably coupled to an electric drivetrain having a motor 136 and a CVT 138 that is coupled to a rear wheel 140 of the bicycle 130.
- the electric motor 30 and/or 48 can be in electrical communication with a control system having an electronic controller, a number of sensors, a source of electrical power, and appropriate wiring and electrical hardware such as those described in U.S. Patent Nos. 7,343,236 and 7,885,747 and European Patent No. 1 ,984,637, which are hereby incorporated by reference herein.
- the electronic controller can be programmed with an algorithm configured to provide automatic adjustment of the motor 30, for example.
- the electronic controller can be programmed with an algorithm configured to provide automatic adjustment of the CVT 1 , for example.
- the controller can receive an input associated with a target user pedaling speed and determine a speed of the bicycle.
- a PID (proportional- integral-derivative) controller and algorithm can be employed in the control system.
- the controller can be configured to adjust the transmission ratio based at least in part on a reading from a torque sensor.
- a controller may refer to a device or system for implementing preferred functionality. Embodiments of a controller or portions thereof may be integrated with other components or be separate. For example, in some embodiments, a controller may be a stand-alone device that is communicatively coupled to other components. Wired or wireless communications may be possible for communicatively coupling a controller to other components. Wireless communications may be via Bluetooth, any 802.1 1 compliant protocol or any other wireless protocol known to those of skill in the art.
- Some embodiments utilize wireless communications between a controller and the shift actuator.
- a portion of logic may be stored in memory associated with a CVT and a portion of logic may be implemented by a controller communicatively coupled to the CVT.
- electronic devices such as smart phones have memory and processors available to store and execute logic, and may be mounted or otherwise associated with a CVT to allow for easy access and use by a user.
- the user of the bicycle can manually adjust the transmission ratio with, for example, the shifter 14.
- the electronic controller can be programmed to control the motor 30 and provide additional power assistance to the rider based on a torque sensor reading.
- the torque assistance enables the rider to maintain a cadence and/or speed of the bicycle in the presence of varying terrain or other factors affecting operating condition of the bicycle.
- the torque from the motor 30 is varied based at least in part on a command from the electronic controller.
- a method of automatically controlling the CVT 1 and/or the motor 30, for example involves receiving an input associated with a target user pedaling speed, determining a speed of the bicycle, and determining a target transmission ratio based at least in part on the target user pedaling speed and the determined speed of the bicycle.
- a method can also include adjusting a transmission ratio of the transmission to be substantially equal to the target transmission ratio.
- the method further includes the step of determining an encoder position associated with the target user pedaling speed.
- the controller can adjust a transmission ratio that can include commanding an actuator to move to the determined encoder position.
- adjusting a shift drum includes the step of rotating a shift rod about a longitudinal axis of the transmission.
- a method of automatically controlling a CVT and/or a motor may include receiving an input associated with a target user pedaling speed, determining a speed of the bicycle, and based upon the target user pedaling speed and the determined speed of the bicycle, adjusting a speed ratio of the bicycle to maintain a user pedaling speed within a band of the target user pedaling speed.
- the band is the target user pedaling speed plus or minus 10 revolutions-per-minute (rpm).
- the band is the target user pedal speed in the range of +1-2 rpm to about +/- 5 rpm.
- adjusting a speed ratio of the bicycle includes the step of determining an encoder position associated with the target user pedaling speed and the determined speed of the bicycle.
- adjusting a speed ratio of the bicycle includes the step of commanding an actuator to move to the determined encoder position. In some embodiments, adjusting a speed ratio of the bicycle includes the step of adjusting a shift rod of the transmission. In some embodiments, adjusting the shift rod includes the step of rotating the shift rod about a longitudinal axis of the transmission.
- a method of automatically controlling a CVT and/or a motor may involve providing an input associated with a target user pedaling speed, determining a speed of the bicycle, and identifying a target encoder position associated with the speed of the bicycle.
- a method can further include actuating a servo to achieve the target encoder position.
- actuating a servo includes the step of adjusting a shift rod of the transmission.
- identifying the target encoder position includes generating a data structure.
- generating a data structure includes the step of recording an encoder position.
- generating a data structure includes the steps of recording an input speed and recording an output speed.
- a method includes the step of determining a speed ratio based at least in part on the input speed and the output speed.
- a method includes the step of recording the speed ratio.
- a control system for the electrical drivetrain 40 can include a speed sensor configured to detect a speed of the bicycle, a processor configured to receive input from the speed sensor, and a data input interface configured to provide cadence data to the processor, the cadence data indicative of an input pedaling speed.
- the system may include a memory in communication with the processor, the memory having stored therein one or more maps correlating bicycle speeds with speed ratios.
- the system includes a logic module in communication with the processor, the logic module configured to cooperate with the processor to determine from the maps a target speed ratio based on a bicycle speed and an input pedaling speed.
- the system has an actuator in communication with the processor, the actuator configured to adjust a speed ratio of the transmission to be substantially equal to the determined target speed ratio.
- the control unit includes at least one of a processor, an application specific integrated circuit, or a programmable logic array.
- the actuator is operably coupled to a shift rod of the transmission, the shift rod configured to adjust the speed ratio of the transmission.
- the data input interface can include a display and at least one button.
- the system can include a position sensor configured to provide an indication of a position of the actuator.
- the data structures can include a speed ratio data structure and a bicycle speed data structure.
- the system can have a power source configured to supply a power to the actuator.
- the power source is a dynamo.
- the actuator is operably coupled to a shift rod of the transmission.
- a control system for use with a bicycle equipped with the CVT 1 and/or the electric drivetrain 40 has a speed sensor configured to detect a speed of the bicycle.
- the system has a processor configured to receive input from the speed sensor.
- the system includes a data input interface configured to provide cadence data to the processor. The cadence data is indicative of an input pedaling speed.
- the system can include a memory in communication with the processor.
- the memory has stored therein one or more maps correlating bicycle speeds with speed ratios.
- the system includes a logic module in communication with the processor. The logic module is configured to cooperate with the processor to determine from the maps a target speed ratio based on a bicycle speed and an input pedaling speed.
- the system can also include an actuator in communication with the processor.
- the actuator is configured to adjust a speed ratio of the transmission to be substantially equal to the determined target speed ratio.
- the data input interface includes a display and at least one button.
- the data input interface is mounted on a handlebar of the bicycle.
- the bicycle can include a position sensor configured to provide an indication of a position of the actuator.
- the data structures have a speed ratio data structure and a bicycle speed data structure.
- the ball-planetary transmission includes a shift rod, the shift rod operably coupled to the actuator.
- Figure 1 1 is an exploded perspective view of a pair of carrier members, also referred to as stator plates (alternately referred to as carrier plates) and a shifting mechanism which can be used to advance or retard the rotation of one of the stator plates with respect to the other stator plate.
- stator plates also referred to as carrier plates
- shifting mechanism which can be used to advance or retard the rotation of one of the stator plates with respect to the other stator plate.
- a zero plane may be defined as a plane in which lies a main axis of the CVT and at least one planet axis when that planet axis is parallel to the main axis.
- the shifting mechanism includes two cam surfaces, one on each side of the shifting mechanism, and an outwardly extending spindle about which the shifting mechanism can be configured to rotate.
- Each stator plate includes an aperture configured to receive one of the cam surfaces.
- One of the cam surfaces may be located radially outward or inward of the other cam surface relative to the axis of rotation of the shifting mechanism.
- an axis of eccentricity of a first cam surface may be angularly offset from an axis of eccentricity of a second cam surface.
- rotation of the shifting mechanism may induce a greater amount of rotation in the stator plate in contact with the radially outward cam surface than in the stator plate in contact with the radially inward cam surface.
- one or more axes of eccentricity may be angularly offset with respect to the zero plane.
- a shifting mechanism such as that depicted in Figure 1 1 can sum the torque force experienced by both stator plates, thereby reducing the overall shift force required to change the position of the shifting mechanism to initiate a shift of the transmissions described herein or other similar transmissions.
- the cam surfaces may be spring loaded or otherwise deformable in response to increased load.
- at least a portion of the cam surface may be a resilient band of material which deforms in response to an applied load.
- the summing and shifting can also be performed by levers, offset gears or other known structures, in each case that are operationally coupled to the stator plates as well.
- Figure 12 is a cross-sectional perspective view of a transmission including a planetary gear set.
- a worm screw may be provided to shift the position of a shifting mechanism of the embodiments described herein and such as that shown in Figure 1 1.
- the illustrated implementation depicts a worm screw which can be used to change the position of the shifting mechanism, or a stator plate, any suitable control system or apparatus may be used to control the position of the shifting mechanism or stator plates.
- the planetary gear set can be used as part of the power path to change the speed and alter the torque applied to the transmission or the motor of the embodiments described herein, or it can be used to distribute torque throughout the various components in the transmission, as desired to manage the amount of torque passed through the variable path of the transmission.
- multiple paths for power to pass are present and it may be advantageous to vary the amount of power that is transferred through the planets of the transmission to improve efficiency, to manage torque and the associated stress or for other commonly known reasons.
- the planetary gear set can be used to step up the speed of an input component and reduce the torque going to the generator.
- a motor may also be integrated with the planetary gear set.
- the integration of a motor and a transmission can also advantageously be used to alter the operating conditions of the motor and enhance the performance of the motor. For example, stepping up the speed of certain motor components relative to other components can increase the resultant flux characteristics and enhance motor performance. Additional examples of motor types, motor configurations, and the beneficial effects which can be achieved by integrating a motor with a transmission including a planetary gear set are described in U.S. Patent No. 7,632,203.
- Figures 13-15 show a method of controlling the relative rotation of two carrier members, such as carrier members 66, 68 depicted in Figure 4.
- Figure 13 schematically depicts a portion of a transmission including carrier members 66, 68 and a rotatable gear structure 1300 in contact with each of the stator plates and rotatable about axis 1305.
- Gear structure 1300 includes a first section 1310 having a first diameter and in contact with first carrier member 66, and a second section 1320 having a second diameter and in contact with second carrier member 68.
- the gear structure can control the relative rates of rotation of first and second carrier members 66, 68, while still summing the reaction forces of the two carrier members to reduce overall shift force required to adjust the tilt angle of the ball axles of the transmissions described herein.
- Figure 14 shows a perspective view of a multi-diameter gear structure, such as the one described above with respect to Figure 13, shown here in contact with a toothed section of a single plate.
- a first portion of the multi-diameter gear structure having a larger diameter than the remainder of the structure, is in contact with a toothed section of a first plate.
- a second portion of the multi-diameter gear structure, with a smaller diameter, can be in contact with a toothed section of a second plate (see Figure 15), not shown in Figure 14 for the sake of clarity.
- Figure 15 shows an opposite perspective view of the multi-diameter gear structure of Figure 14, shown here in contact with two plates.
- the narrower portion of the multi-diameter gear structure (not visible in Figure 14) is in contact with a toothed portion of the rear plate, while the thicker portion of the multi-diameter gear structure is in contact with a toothed portion of the front plate.
- the differences in diameter between the geared sections of the multi-diameter gear structure control the relative amount of rotation between the two plates.
- various illustrative logical blocks, modules, and circuits described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
- DSP digital signal processor
- ASIC application specific integrated circuit
- FPGA field programmable gate array
- a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
- a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
- Software associated with such modules may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other suitable form of storage medium known in the art.
- An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
- the processor and the storage medium may reside in an ASIC.
- a controller for the CVT 1 comprises a processor (not shown).
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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EP14724614.4A EP2986494A1 (en) | 2013-04-19 | 2014-04-16 | Continuously variable transmission |
JP2016509048A JP6660876B2 (en) | 2013-04-19 | 2014-04-16 | Continuously variable transmission |
KR1020157032396A KR102433297B1 (en) | 2013-04-19 | 2014-04-16 | Continuously variable transmission |
CN201480034460.4A CN105324299B (en) | 2013-04-19 | 2014-04-16 | Contiuously variable transmission |
CA2909565A CA2909565A1 (en) | 2013-04-19 | 2014-04-16 | Continuously variable transmission |
US14/885,846 US9677650B2 (en) | 2013-04-19 | 2015-10-16 | Continuously variable transmission |
US15/619,285 US10323732B2 (en) | 2013-04-19 | 2017-06-09 | Continuously variable transmission |
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Also Published As
Publication number | Publication date |
---|---|
TW201819244A (en) | 2018-06-01 |
US20160040763A1 (en) | 2016-02-11 |
CN105324299A (en) | 2016-02-10 |
JP6660876B2 (en) | 2020-03-11 |
US20170276217A1 (en) | 2017-09-28 |
CA2909565A1 (en) | 2014-10-23 |
EP2986494A1 (en) | 2016-02-24 |
US9677650B2 (en) | 2017-06-13 |
TWI667170B (en) | 2019-08-01 |
CN105324299B (en) | 2018-10-12 |
CN109018173A (en) | 2018-12-18 |
TWI622522B (en) | 2018-05-01 |
TW201446584A (en) | 2014-12-16 |
JP2016516633A (en) | 2016-06-09 |
US10323732B2 (en) | 2019-06-18 |
CN109018173B (en) | 2021-05-28 |
KR102433297B1 (en) | 2022-08-16 |
KR20150144770A (en) | 2015-12-28 |
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