WO2001073319A1 - Continuous variable transmission - Google Patents

Continuous variable transmission Download PDF

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Publication number
WO2001073319A1
WO2001073319A1 PCT/KR2001/000453 KR0100453W WO0173319A1 WO 2001073319 A1 WO2001073319 A1 WO 2001073319A1 KR 0100453 W KR0100453 W KR 0100453W WO 0173319 A1 WO0173319 A1 WO 0173319A1
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WO
WIPO (PCT)
Prior art keywords
gear
speed change
change controller
variable transmission
continuous variable
Prior art date
Application number
PCT/KR2001/000453
Other languages
French (fr)
Inventor
Hyeon-Soo Kim
Original Assignee
B A Tech Company Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by B A Tech Company Limited filed Critical B A Tech Company Limited
Priority to AU42841/01A priority Critical patent/AU4284101A/en
Publication of WO2001073319A1 publication Critical patent/WO2001073319A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/12—Supports for plants; Trellis for strawberries or the like
    • A01G9/126—Wirespool supports
    • 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
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/08—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/12—Supports for plants; Trellis for strawberries or the like
    • A01G9/122—Stakes
    • 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
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
    • B62M11/145—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears built in, or adjacent to, the bottom bracket
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
    • F16H37/084—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths at least one power path being a continuously variable transmission, i.e. CVT
    • F16H37/0846—CVT using endless flexible members

Definitions

  • Figs. 1 and 2 illustrate the first embodiment of the present invention.
  • the first and second connecting gears 10 and 11 of the speed change controller 2 are engaged with the pinions 4 and sun gear 3 of the planet gear unit 1, respectively.
  • an assistant gear 18 and an extension gear portion 19 are provided at the planet gear unit 1 in opposite to the carrier 6.
  • the assistant gear 18 has a ring shape and is provided with a circumscribing gear.
  • the extension gear portion 19 is provided at the sun gear 3 and extends axially.

Abstract

Disclosed is a continuous variable transmission including a speed change controller, and a planet gear unit including three gear elements including a sun gear, at least one pinion, and a ring gear. The pinion is coupled to an input shaft adapted to transmit an input power. Two of the gear elements are selectively connected to the speed change controller. A selected one of the two gear elements connected to the speed change controller is coupled to an output shaft adapted to output the power in a state speed-changed by the speed change controller. The speed change controller inclludes a pair of belt pulleys, a pair of connecting gears adapted to connect respective rotating shafts of the belt pulleys to the two gear elements of the planet gear unit, and a support bar selectively connected to the belt pulleys and adapted to vary respective diameters of the belt pulleys.

Description

CONTINUOUS VARIABLE TRANSMISSION
Technical Field
The present invention relates to a continuous variable transmission, and more particularly to a continuous variable transmission capable of continuously varying transmission of a power using a simple configuration including one planet gear unit and one belt-pulley type speed change controller.
Background Art Generally, a transmission is a device for outputting an input power in a variable state. Such a transmission is used in most machines using a power.
Transmissions are classified into ' those of a manual type, in which the user manually manipulates a transmission to conduct a desired speed change in accordance with a running situation, and those of an automatic type, in which a transmission automatically conducts a desired speed change, based on a self determination thereof for a running situation. Today, automatic type transmissions are widely used by virtue of a convenience in use thereof.
Although such an automatic type transmission provides a convenience in that it conducts a speed change based on a self determination thereof for the point of time when the speed change is to be made, it still involves the same problems as those involved in manual type transmission. That is, the automatic type transmission involves the generation of a transmission impact when diverse gears are engaged from each other or disengaged from each other during a speed change operation automatically made in accordance with a running situation because the speed change is achieved by the automatic engagement or disengagement of gears. Furthermore, the automatic type transmission requires a high input power because the speed change status thereof depends on the level of the input power generated from a power source. Meanwhile, a continuous variable transmission has been developed in order to eliminate the problems involved in the above mentioned automatic type transmission. Such a continuous variable transmission is adapted to achieve a continuous speed change. Since a continuous speed change is carried out, the continuous variable transmission provides advantages in that there is no transmission impact generated during a speed change operation, and that a linearly speed-variable output is obtained. For such a continuous variable transmission, there are various types. Most continuous variable transmissions basically use a planet gear unit. Such continuous variable transmissions have a configuration, in which a belt-pulley assembly is coupled to the planet gear unit, or a configuration, in which a frictional roller is coupled to the planet gear unit.
In such continuous variable transmissions, the belt-pulley assembly or frictional roller is connected in series to the planet gear unit. In accordance with this connection, a power generated from a power source is varied while passing the planet gear unit, and then transmitted to the belt-pulley assembly or frictional roller. Alternatively, the power is first transmitted to the belt-pulley assembly or frictional roller, and then linearly varied while passing the planet gear unit. Due to such a connection, such continuous variable transmissions involve a complex configuration and a large volume.
In the case of continuous variable transmission mainly used in automobiles, at least two or a plurality of planet gear units are used in order to obtain an extended speed change range. For this reason, there are disadvantages of an increased complexity of the configuration and an excessively enlarged volume. On the other hand, although there are a variety of transmissions adapted to be used in power mechanisms such as automobiles, there is a slight development of transmissions for small-size power mechanisms such as bicycles or motorcycles. Only for bicycles, a transmission is known, which has a configuration including a plurality of sprockets having different diameters while being arranged around each of drive and driven shafts. In this transmission, a chain engaged with a selected one of the sprockets is shifted onto another one of the sprockets, thereby achieving a desired speed change. In such a transmission for bicycles, however, a considerable transmission impact is generated during the shift operation of the chain. Furthermore, there is a problem in that the shift operation of the chain should be conducted with respect to both the front and rear sprockets in a simultaneous fashion.
Moreover, transmissions having the above mentioned general configuration cannot be applied to bicycles or motorcycles as they are. This is because the general transmissions have a large volume and have problems involved in the use thereof.
Disclosure of the Invention
Therefore, an object of the invention is to solve the above mentioned problems, and to provide a continuous variable transmission having a simple configuration while having an extended speed change range, achieving a linear speed change, and being applicable to running machines such as bicycles and motorcycles .
In accordance with the present invention, this object is accomplished by providing a continuous variable transmission comprising: a speed change controller; and a planet gear unit including three gear elements, two of the gear elements being selectively connected to the speed change controller, the pinion being coupled to an input shaft adapted to transmit an input power, and one of the two gear elements being selectively coupled to an output shaft of the speed change controller.
Figure imgf000005_0001
The one element of said planet gear unit may be provided with an assistant input gear to be connected to the input portion of the speed change controller (PIV) , and the other element may be provided with an extended gear portion to be connected to the output shaft of the speed change controller. The continuous variable transmission having the above construction can be used in a bicycle by providing the sprocket in an output element of the above planet gear unit.
Accordingly, the continuous variable transmission of the present invention enables an infinite speed change with a simple configuration. In particular, the continuous variable transmission can be easily applied to a bicycle or motorcycle while providing a convenience in use. The continuous variable transmission of the present invention is also applied to any power mechanisms.
Brief Description of The Drawings
The above objects, and other features and advantages of the present invention will become more apparent after a reading of the following detailed description when taken in conjunction with the drawings, in which:
Fig. 1 is a perspective view illustrating a continuous variable transmission according to a first embodiment of the present invention in a state in which a planet gear unit is separated from the transmission;
Fig. 2 is a half sectional view illustrating the continuous variable transmission according to .the first embodiment of the present invention in a state in which the planet gear unit is coupled to a speed change controller;
Fig. 3 is a perspective view illustrating a continuous variable transmission according to a second embodiment of the present invention in a state in which the planet gear unit is separated from the transmission; Fig. 4 is a half sectional view illustrating the continuous variable transmission according to the second embodiment of the present invention in a state in which the planet gear unit is coupled to the speed change controller; Fig. 5 is a half sectional view illustrating the continuous variable transmission according to the third embodiment of the present invention in a state in which the planet gear unit is coupled to the speed change controller.
Best Mode for Carrying Out the Invention
Now, preferred embodiments of the present invention will be described in conjunction with the annexed drawings . The present invention provides a continuous variable transmission including a planet gear unit 1, and a belt-pulley type speed change controller 2. The planet gear unit 1 includes three kinds of gear elements, that is, a sun gear 2, pinions 4, and a ring gear 5. Two gear elements of the planet gear unit 1 are selectively connected to the speed change controller 2. The pinions 4 of the planet gear unit 1 is coupled to an input shaft to which an input power is transmitted. An optional one of the two gear elements connected to the speed change controller 2 is connected to an output shaft.
The present invention has various embodiments respectively associated with different connection types between the planet gear unit 1 and the speed change controller 2. In the following description, the present invention will be described in conjunction with the embodiments, respectively.
The speed change controller 2 is engaged with two of the gear elements included in the planet gear unit 1, so that it controls the engaged gear elements, thereby controlling the rotating speed of an output element.
The planet gear unit 1 basically has a general configuration. That is, the planet gear unit 1 includes one sun gear 2, a plurality of pinions 4 arranged around the sun gear 2 and engaged with the sun gear 3 to conduct a rotation and revolution, and one ring gear 5 circumscribed on the pinions 4 in common. The pinions 4 are supported by a single carrier 6 so that they rotate together.
The speed change controller 2 includes two variable belt pulleys 7 and 8, a belt 9 adapted to connect the variable belt pulleys 7 and 8 with each other, and a pair of connecting gears, that is, a first connecting gear 10 and a second connecting gear 11, adapted to transmit a power to the variable belt pulleys 7 and 8, and to output a speed-changed power.
The variable belt pulley 7 includes two plate- shaped pulley portions 7a and 7b respectively fitted around rotating shafts 12 and 13 in such a fashion that they are rotatable about the associated rotating shafts 12 and 13 while being axially movable along the rotating shafts 12 and 13. In similar, the variable belt pulley 8 includes two plate-shaped pulley portions 8a and 8b respectively fitted around rotating shafts 12 and 13 in such a fashion that they are rotatable about the associated rotating shafts 12 and 13 while being axially movable along the rotating shafts 12 and 13. The pulley portion 7a of the variable belt pulley 7 and the pulley portion 8b of the variable belt pulley 8 are fixedly mounted to a support bar 14. The support bar 14 is fitted around a central shaft 15 at a central portion thereof in such a fashion that it is rotatable about the central shaft 15 while being axially movable along the central shaft 15.
As the support bar 14 moves along the central shaft 15, the pulley portions 7a and 8b of the variable belt pulleys 7 and 8 mounted to the support bar 14 move axially along the associated rotating shafts 12 and 13, respectively. In accordance with the movements of the pulley portions 7a and 8b, gaps respectively defined in the variable belt pulleys 7 and 8 are increased or reduced in the same ratio.
As the gaps respectively defined in the variable belt pulleys 7 and 8 are increased or reduced in the same ratio, the speed of the power transmitted via the belt 9 connected between the variable belt pulleys 7 and
8 is varied in a continuous fashion other than an intermittent fashion. In order to allow the support bar 14 along the central shaft 15, as mentioned above, a cable connecting plate 17 may be mounted to the central portion of the support bar 14. A cable 16 is connected to the cable connecting plate 17. When the cable 16 connected to the cable connecting plate 17 is pushed or pulled, the support bar 14 is axially moved along the central shaft 15, thereby causing respective gaps of the variable belt pulleys 7 and 8 to be varied. In accordance with such a linear variation in respective gaps of the variable belt pulleys 7 and 8, the rotating speed of the power transmitted via the belt
9 connected between the variable belt pulleys 7 and 8.
The continuous variable transmission of the present invention, which includes the planet gear unit 1 and speed change controller 2 coupled to each other, may be implemented in various embodiments respectively associated with different connection types between the planet gear unit 1 and the speed change controller 2. Now, the configuration and operation of each embodiment will be described.
Figs. 1 and 2 illustrate the first embodiment of the present invention. In accordance with this embodiment, the first and second connecting gears 10 and 11 of the speed change controller 2 are engaged with the pinions 4 and sun gear 3 of the planet gear unit 1, respectively. In order to allow the first and second connecting gears 10 and 11 of the speed change controller 2 to be engaged with the pinions 4 and sun gear 3 of the planet gear unit 1, an assistant gear 18 and an extension gear portion 19 are provided at the planet gear unit 1 in opposite to the carrier 6. The assistant gear 18 has a ring shape and is provided with a circumscribing gear. The extension gear portion 19 is provided at the sun gear 3 and extends axially.
In accordance with this configuration, the first and second connecting gears 10 and 11 of the speed change controller 2 are engaged with the assistant gear 18 and the extension gear portion 19 of the sun gear 3. In accordance with the first embodiment of the present invention, the pinions 4 not engaged with the speed change controller 2 serve as an input element adapted to receive a power. The ring gear 5 serves as an output element adapted to transmit the power. In the continuous variable transmission having the above mentioned configuration according to the first embodiment of the present invention, when a power is applied to the pinions 4 via the carrier 6, the sun gear 3 and ring gear 5 respectively inscribed and circumscribed on the pinions 4 are rotated. Simultaneously, the power transmitted via the pinions 4 is transmitted to the speed change controller 2 via the assistant gear 18 and the first connecting gear 10. The transmitted power is varied in speed in accordance with the diameter ratio between the variable belt pulleys 7 and 8 of the speed change controller 2. The speed-varied power is then transmitted to the sun gear 3 of the planet gear unit 1 via the second connecting gear 11 of the speed change controller 2 and the extension gear portion 19 of the sun gear 3. Thus, the power inputted from a power source via the pinions 4 of the planet gear unit 1 is transmitted to the sun gear 3 after being controlled in speed by the speed change controller 2. Accordingly, the rotating speed of the sun gear 3 is increased or decreased in accordance with a control status of the speed change controller 2. As the sun gear 3 is varied in rotating speed, the load applied to the pinions 4, which conducts a rotation about their axes and a revolution around the sun gear 3, is varied. As a result, the drive force of the ring gear 5, which receives the power from the pinions 4, is varied.
That is, in the continuous variable transmission according to the first embodiment of the present invention, the power required to drive the pinions 4 is varied in accordance with the relative rotating speed of the sun gear 3. The rotating speed of the sun gear 3 is also varied in accordance with a speed change status transmitted via the pinions 4 and speed change controller 2. Accordingly, the level of the power required to drive the pinions 4 is varied in accordance with the control status of the speed change controller 2.
Also, the rotating speed and output torque of the ring gear 5, which serves as an output element, is varied in accordance with the rotating speed and torque of the pinions 4. Consequently, the rotating speed of the ring gear 5 is varied, depending on the rotating speed of the sun gear 3. When the cable 16 connected to the speed change controller 2 having the above mentioned configuration is pushed or pulled to move the support bar 14 mounted to the speed change controller 2 , thereby relatively varying the diameters of the variable belt pulleys 7 and 8 fixedly mounted to the support bar 14, the speed of -lithe power transmitted between the variable belt pulleys 7 and 8 is linearly varied. As a result, the drive speed of the sun gear 3 is varied. This results in a linear variation in the power outputted from the ring gear 5 in terms of torque and rotating speed.
Meanwhile, the power outputted via the ring gear 5 may be externally transmitted using an appropriate method determined in accordance with the application status of the continuous variable transmission. In the case illustrated in Figs. 1 and 2, a sprocket 20 is installed at the outside of the ring gear 5, in order to allow the continuous variable transmission to be applied to a bicycle.
In this case, accordingly, the chain of a bicycle is connected to the sprocket 20, so as to use the continuous variable transmission of the present invention. In this case, bicycle pedals 21 are used as the power source for inputting a power to the pinions 4, as shown in Figs. 1 and 2. Alternatively, the output shaft of an engine may be connected to the carrier 6 for the pinions 6. Thus, the continuous variable transmission of the present invention can be widely used under the condition in which it is mounted to transporting devices, such as vehicles and motorcycles, using an engine.
Figs. 3 and 4 illustrate the second embodiment of the present invention. In Figs. 3 and 4, elements respectively corresponding to those in Figs. 1 and 2 are denoted by the same reference numerals. This embodiment is different from the above mentioned first embodiment in that the first and second connecting gears 10 and 11 of the speed change controller 2 are adapted to connect the pinions 4 and ring gear 5 of the planet gear unit 1 together, that the pinions 4 serve as an input stage for inputting a power to the planet gear unit 1, and that the sun gear 3 serves as an output stage for outputting a speed-changed power from the planet gear unit 1.
In order to allow the first and second connecting gears 10 and 11 of the speed change controller 2 to be engaged with the pinions 4 and ring gear 5 of the planet gear unit 1, an assistant gear 18 is mounted to the pinions 4 in common. Also, a circumscribing gear 22 is also provided at the ring gear 5.
In accordance with this configuration, the second connecting gear 11 of the speed change controller 2 is engaged with the assistant gear 18 mounted to the pinions 4. The first connecting gear 10 of the speed change controller 2 is engaged with the circumscribing gear 22 of the ring gear 5. In the continuous variable transmission having the above mentioned configuration according to the second embodiment of the present invention, the power inputted via the carrier 6 and pinions 4 is transmitted to the speed change controller 2, so that it is linearly varied in speed in accordance with a variation in the diameters of- the variable belt pulleys 7 and 8. The power is then transmitted to the ring gear 5 of the planet gear unit 1, thereby controlling the rotating speed of the ring gear 5. As a result, the speed of the pinion 4, which conducts a rotation and revolution while being inscribed on the ring gear 5, is varied.
That is, the power required to rotate the pinions 4 inscribed on the ring gear 5 can be varied in accordance with the rotating speed of the ring gear 5. In accordance with such an operative connection relationship, the rotating speed of the ring gear 5 is varied in accordance with the rotating speed of the pinion 4. As a result, the pinion 4, which is inscribed on the ring gear 5, is varied in torque. Accordingly, the torque and rotating speed of the power required to drive the pinions 4 can be varied in accordance with a control status of the speed change controller 3. By virtue of such variations in the torque and rotating speed of the pinions 4, the rotating speed and torque of the sun gear 3, which is rotated by a torque received from the pinions 4, are varied.
As described in detail with reference to the first embodiment, therefore, the speed of power outputted from the second connecting gear 11 to the planet gear unit 1 via the first connecting gear 10 is linearly varied. As a result, the rotating speed and torque of the sun gear 3 is linearly varied.
In Figs. 3 and 4, an application of the continuous variable transmission according to the present invention to a bicycle is illustrated. A sprocket 20 is mounted to the sun gear 3 serving as the output stage of the planet gear unit 1 in such a fashion that it is integral with the sun gear 3. Bicycle pedals 21 are also connected to the carrier 6 for the pinions 4. Accordingly, a drive force generated in accordance with an operation of the pedals 21 is transmitted to the speed change controller 2 via the pinions 4 of the planet gear unit 1. This power is then linearly varied in accordance with the control status of the speed change controller 2. The linearly-varied power is then transmitted to the ring gear 5 of the planet gear unit 1 while varying the relative rotating speed of the ring gear 5. This results in a variation in the operating condition of the pinions 4 which rotates while being inscribed on the ring gear 5. As a result, the rotating speed and torque of the sun gear 3, which rotates while being inscribed on the pinion 4, are varied.
Fig. 5 illustrates the third embodiment of the present invention. In Fig. 5, elements respectively corresponding to those in Figs. 1 and 2 are denoted by the same reference numerals. This embodiment is different from the above mentioned first embodiment in that the first and second connecting gears 10 and 11 of the speed change controller 2 are adapted to connect the sun gear 3 and ring gear 5 of the planet gear unit 1 together, that the pinions 4 serve as an input stage for inputting a power to the planet gear unit 1, and that the sun gear 3 serves as an output stage for outputting a speed-changed power from the planet gear unit 1. In order to allow the first and second connecting gears 10 and 11 of the speed change controller 2 to be engaged with the sun gear 3 and ring gear 5 of the planet gear unit 1, a circumscribing gear 22 is provided at the ring gear 5, as in the second embodiment. Also, an assistant gear portion 23 is provided at the sun gear 3.
In accordance with this configuration, the first connecting gear 10 of the speed change controller 2 is engaged with the circumscribing gear 22 of the ring gear 5. The second connecting gear 11 of the speed change controller 2 is engaged with the assistant gear portion 23 of the sun gear 3.
In the continuous variable transmission having the above mentioned configuration according to the third embodiment of the present invention, an input power is transmitted to the ring gear via the carrier 6 and pinions 4. The power transmitted to the ring gear 5 is then transmitted to the speed change controller 2 via the first connecting gear 10, so that it is linearly varied in speed in accordance with a variation in the diameters of the variable belt pulleys 7 and 8. The power is then transmitted to the sun gear 3 of the planet gear unit 1 via the second connecting gear 11.
Thus, the power transmitted to the ring gear 5 via the pinions is varied in speed by the speed change controller 3, and then transmitted to the sun gear 3. Thus, the power is linearly varied in speed in accordance with the control status of the speed change controller 2. That is, the torque and rotating speed of the power outputted from the sun gear 3 can be varied in accordance with the control status of the speed change controller 2 connecting the ring gear 5 and sun gear 3 together. In accordance with the continuous variable transmission according to the third embodiment of the present invention, therefore, it is possible to vary the level of the power inputted to the pinions 4 via the pedals while maintaining the rotating speed of the power outputted via the sun gear 3.
Accordingly, where the continuous variable transmission according to the third embodiment of the present invention is applied to a bicycle, the user is allowed to conveniently drive the bicycle without any difficult in rotating the pedals 21 because it is possible to vary the level of the power inputted in accordance with the rotation of the pedals 21 while maintaining the rotating speed of the power outputted via the sun gear 3. Fig. 5 illustrates an application of the continuous variable transmission according to the present invention to a bicycle. In this case, a sprocket 20 is mounted to the sun gear 3 serving as an output stage of the planet gear unit 1 in such a fashion that it is integral with the sun gear 3. Pedals 21 are connected to the carrier 6 of the pinion 4.
Alternatively, the ring gear 5 may serve as an output element for outputting a power, in place of the sun gear 3, as different from the third embodiment mentioned above. Where the ring gear 5 is used as the output element, it is possible to eliminate the sprocket provided at the sun gear. In this case, a sprocket is installed in parallel to the ring gear 5.
The operation in this modified embodiment is carried out in the same fashion as the third embodiment.
Where the above mentioned continuous variable transmission according to the present invention is applied to a bicycle, the user is allowed to conveniently drive the bicycle without any difficult in rotating the pedals 21 under the condition in which the speed change controller 2 is varied in control status in accordance with the condition of the user because it is possible to vary the torque required to rotate the pedals 21 in accordance with the control status of the speed change controller 2.
As apparent from the above description, the continuous variable transmission according to the present invention has a simple configuration including a reduced number of elements while being capable of achieving an effective linear speed change. By virtue of such a configuration, the continuous variable transmission of the present invention can be simply applied to a transporting mechanism, such as a bicycle, without any spatial and installation problems, so that it is effectively used.
Although the preferred embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. For example, although the continuous variable transmission of the present invention has been described as being applied to a bicycle, it may be applied to any power transporting mechanisms. Industrial Applicability
As apparent from the above description, the present invention provides a continuous variable transmission including a planet gear unit, and a belt- pulley type speed change controller. Two gear elements of the planet gear unit, which includes three gear elements, are connected to first and second connecting gears of the speed change controller. An external power is inputted to the transmission via the pinions of the planet gear unit. The power is then outputted from the transmission via an optional one of the two gear elements respectively connected to the first and second connecting gears of the speed change controller after being varied in speed. In this continuous variable transmission, the torque and rotating speed of the power outputted from the output element of the planet gear unit is linearly varied in accordance with the control status of the speed change controller. Accordingly, where the continuous variable transmission of the present invention is applied to small-size power driving mechanisms such as bicycles and motorcycles, an effective continuous speed change.

Claims

Claims
1. A continuous variable transmission comprising: a speed change controller; and a planet gear unit including three gear elements, two of said three gear elements being selectively connected to the speed change controller, the pinion of said planet gear unit being coupled to an input shaft adapted to transmit an input power, and a selected one of the two gear elements connected to the speed change controller being coupled to an output shaft adapted to output the power in a state speed-changed by the speed change controller.
2. The continuous variable transmission according to claim 1, wherein the speed change controller comprises: a pair of belt pulleys; first and second connecting gears adapted to connect respective rotating shafts of the belt pulleys to the two gear elements of the planet gear unit; and a support bar selectively connected to the belt pulleys and adapted to vary respective diameters of the belt pulleys.
3. The continuous variable transmission according to claim 1 or 2, further comprising: an assistant gear adapted to connect the first connecting gear of the speed change controller to the pinion of the planet gear unit; and an extension gear portion provided at the sun gear of the planet gear unit and adapted to connect the sun gear to an output stage of the speed change controller.
4. The continuous variable transmission according to claim 3, further comprising: a sprocket mounted to the ring gear of the planet gear unit .
5. The continuous variable transmission according to claim 2, further comprising: • an assistant gear mounted to the pinion of the planet gear unit and adapted to connect the first connecting gear of the speed change controller to the pinion; and a circumscribing gear adapted to connect the second connecting gear of the speed change controller to the ring gear.
6. The continuous variable transmission according to claim 1, further comprising: an assistant gear portion provided at the sun gear of the planet gear unit and adapted to connect the second connecting gear of the speed change controller to the sun gear; a circumscribing gear adapted to connect the first connecting gear of the speed change controller to the ring gear; and a carrier adapted to connect the pinion to the input shaft.
7. The continuous variable transmission according to claim 1, further comprising: an input portion and an output portion being selectively connected to one of the ring gear, pinion gear and sun gear, resulting in twelve cases of output elements .
PCT/KR2001/000453 2000-03-29 2001-03-22 Continuous variable transmission WO2001073319A1 (en)

Priority Applications (1)

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AU42841/01A AU4284101A (en) 2000-03-29 2001-03-22 Continuous variable transmission

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AU4284101A (en) 2001-10-08
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