continuously variable transmission

Abstract

To provide a continuously variable transmission.SOLUTION: A continuously variable transmission of the present invention includes: a driving pulley part that is coupled to a power generating device and rotates at a first rotational radius and a first rotational speed with the power generated by the power generating device; a following pulley part that is rotated at a second rotational radius and a second rotational speed by hooking of the other side of a chain part onto a part of an outer face, with one side of the chain part being hooked to a part of the outer face of the driving pulley part; and a support part that supports a lower part of the following pulley part in rotation, and moves in a first direction toward the following pulley part or moves in a second direction opposite to the first direction while being in contact with the following pulley part. The movement of the support part in the first direction or the second direction can deform the following pulley part such that the second rotational radius becomes longer or shorter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a continuously variable transmission, and more particularly to a continuously variable transmission in which one side of a chain portion is hooked onto a driving pulley portion that is connected to a power generating device and rotates, and the other side of the chain portion is hooked onto a driven pulley portion that is connected to a driven shaft, and the rotation radius of the driven pulley portion increases or decreases depending on the movement of a support portion that supports the driven pulley portion, thereby eliminating speed change shock and eliminating the need for a special chain. [Background technology]

[0002] A transmission is a device that converts the rotational speed between two shafts in a stepped or stepless manner when transmitting rotation from one side of two shafts to the other.

[0003] Depending on the transmission principle, there are mechanical transmissions, fluid transmissions, and electrical transmissions, and there are step transmissions that change the rotational speed in steps, and continuously variable transmissions that change it continuously. Belt motors, sliding gears, clutches, and sliding keys that use steps are examples of mechanical step transmissions, while friction motors and hoist motors are examples of mechanical continuously variable transmissions.

[0004] Typically, a stepwise transmission moves the position of a power transmission medium (e.g., gears, chains, and belts) connected between two shafts in steps to gradually change the rotational speed.

[0005] In this case, as the position of the power transmission medium changes while the two shafts continue to rotate, a collision occurs between the power transmission medium and the shaft that is connected at the changing position, resulting in a shift shock.

[0006] Furthermore, as mentioned above, since the power transmission medium collides with a rotating shaft, not a stationary shaft, the magnitude of the gear shift impact caused by the collision can be very large.

[0007] Therefore, there is a demand for technology that can change the rotational speed (rotation ratio, gear ratio) continuously without causing any shock when changing gears. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Registration No. 10-1238414 Summary of the Invention [Problem to be solved by the invention]

[0009] The object of the present invention is to provide a transmission device in which one side of the chain is hooked onto a driving pulley that is connected to a power generating device and rotates, and the other side of the chain is hooked onto a driven pulley that is connected to a driven shaft, and the rotation radius of the driven pulley increases or decreases as the support that supports the driven pulley moves, thereby enabling infinitely variable speed change without any shifting shock.

[0010] The objects of the present invention are not limited to those described above, and other objects and advantages of the present invention not mentioned above can be understood from the following description and will be more clearly understood from the examples of the present invention. Furthermore, it can be easily understood that the objects and advantages of the present invention can be realized by the means recited in the claims and combinations thereof. [Means for solving the problem]

[0011] The present invention relates to a continuously variable transmission, including a driving pulley unit coupled to a power generating unit and rotating at a first rotation radius and a first rotation speed by power generated by the power generating unit; a driven pulley unit having one side hooked on a portion of the outer surface of the driving pulley unit and the other side of a chain unit hooked on a portion of the outer surface, rotating at a second rotation radius and a second rotation speed; and a support unit supporting a lower part of the rotating driven pulley unit and moving in a first direction toward the driven pulley unit or in a second direction opposite to the first direction while in contact with the driven pulley unit; wherein the driven pulley unit can be deformed such that the second rotation radius becomes longer or shorter as the support unit moves in the first direction or the second direction.

[0012] The driven pulley portion can change a speed ratio, which is a ratio between the first rotation speed and the second rotation speed, by changing the second rotation speed.

[0013] The driven pulley portion may include a rotating plate to which a driven shaft that rotates when the power is transmitted is coupled; and a plurality of rotating shafts that extend from the rotating plate but are positioned on the same plane as the rotating plate, have variable lengths, and have ends to which the chain portion is hooked.

[0014] The driven pulley portion may further include a plurality of support shafts extending from the plurality of rotating shafts in a direction toward the support portion; a plurality of rotating holders fastened to ends of the plurality of support shafts and formed in a hemispherical shape; and a plurality of rotating balls rotatably coupled to the plurality of rotating holders and supported by the support portion while in contact with the inclined side surfaces of the support portion.

[0015] The support portion may be formed in a cylindrical or conical shape with different diameters at its upper and lower surfaces, and may be positioned between the plurality of rotating balls, with the inclined side surfaces supporting the plurality of rotating balls.

[0016] As the support parts move in the first direction, the cross-sectional areas of the support parts positioned on the same plane increase, and the mutual separation distance of the plurality of rotating balls increases; the mutual separation distance of the plurality of rotating holders increases when the mutual separation distance between the plurality of rotating balls increases; the mutual separation distance of the plurality of support shafts increases when the mutual separation distance between the plurality of rotating holders increases; and the mutual separation distance of the plurality of rotating shafts can be extended and changed when the mutual separation distance between the plurality of support shafts increases, thereby increasing the second rotation radius and decreasing the second rotation speed and gear ratio.

[0017] As the support parts move in the second direction, the cross-sectional areas of the support parts positioned on the same plane decrease, and the mutual separation distance of the plurality of rotating balls becomes shorter; the mutual separation distance of the plurality of rotating holders becomes shorter when the mutual separation distance between the plurality of rotating balls becomes shorter; the mutual separation distance of the plurality of support shafts becomes shorter when the mutual separation distance between the plurality of rotating holders becomes shorter; and the mutual separation distance of the plurality of rotating shafts becomes shorter when the mutual separation distance between the plurality of support shafts becomes shorter, thereby shortening the second rotation radius and increasing the second rotation speed and gear ratio. [Effects of the Invention]

[0018] According to the present invention, one side of the chain portion is hooked onto a driving pulley portion that is connected to a power generating device and rotates, and the other side of the chain portion is hooked onto a driven pulley portion that is connected to a driven shaft, and the rotation radius of the driven pulley portion is lengthened or shortened by the movement of the support portion that supports the driven pulley portion, thereby enabling continuously variable speed change without speed change shock. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a top perspective view of a continuously variable transmission according to an embodiment of the present invention; [Figure 2] 1 is a bottom perspective view of a continuously variable transmission according to an embodiment of the present invention; [Figure 3]1 is an exploded perspective view of a continuously variable transmission according to an embodiment of the present invention; [Figure 4] 1 is a bottom view of a continuously variable transmission according to an embodiment of the present invention; [Figure 5] 1 is a side view of a continuously variable transmission according to an embodiment of the present invention; [Figure 6] 1 is a top view of a continuously variable transmission according to an embodiment of the present invention; [Figure 7] 4 is a side view illustrating a process of changing a speed ratio of a continuously variable transmission according to an embodiment of the present invention; FIG. [Figure 8] 4 is a top view illustrating a process of changing a speed ratio of a continuously variable transmission according to an embodiment of the present invention; FIG. [Figure 9] FIG. 10 is a top perspective view of a continuously variable transmission according to another embodiment of the present invention. [Figure 10] FIG. 10 is a top perspective view of a continuously variable transmission according to still another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] Various embodiments of the present invention will be described below with reference to the accompanying drawings. However, it should be understood that this is not intended to limit the present invention to the specific embodiments, but rather includes various modifications, equivalents, and / or alternatives of the embodiments of the present invention. In describing the drawings, like reference numerals may be used for similar components.

[0021] As used herein, terms such as "have," "may have," "include," or "may include" refer to the presence of a given feature (e.g., a value, function, operation, or component such as a part) and do not exclude the presence of additional features.

[0022] As used herein, phrases such as "A or B," "at least one of A and / or B," or "one or more of A and / or B" may include all possible combinations of the items listed together. For example, "A or B," "at least one of A and B," or "at least one of A or B" can refer to (1) at least one A, (2) at least one B, or (3) both at least one A and at least one B.

[0023] As used herein, terms such as "first," "second," "first," or "second" may modify various components regardless of order and / or importance, and are used merely to distinguish one component from another, not to limit the components in question. For example, a first orderer device and a second orderer device may refer to different orderer devices regardless of order or importance. For example, a first component may be named a second component, and similarly, a second component may be named interchangeably with the first component, without departing from the scope of the rights described herein.

[0024] When a component (e.g., a first component) is said to be "operatively or communicatively coupled with" or "connected to" another component (e.g., a second component), it should be understood that the component may be directly coupled to the other component or may be coupled through another component (e.g., a third component). On the other hand, when a component (e.g., a first component) is said to be "directly coupled with" or "directly connected to" another component (e.g., a second component), it should be understood that there is no other component (e.g., a third component) between the component and the other component.

[0025] As used herein, the phrase "configured to" can be used interchangeably with, for example, "suitable for," "having the capacity to," "designed to," "adapted to," "made to," or "capable of," depending on the context. The term "configured to" does not necessarily mean "specifically designed to" in terms of hardware. Instead, in some contexts, the phrase "device configured to" can mean that the device is "capable of" working with other devices or components.

[0026] The terms used herein are merely used to describe particular embodiments and are not intended to limit the scope of other embodiments. A singular expression may include a plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the art described herein. Among the terms used herein, terms generally defined in dictionaries may be interpreted as meanings that are the same as or similar to the meanings they have in the context of the relevant art, and unless explicitly defined in this document, they should not be interpreted in an idealized or overly formal sense. In some cases, even terms defined in this document may not be interpreted to exclude embodiments of this document.

[0027] FIG. 1 is an upper perspective view of a continuously variable transmission according to one embodiment of the present invention, FIG. 2 is a lower perspective view of a continuously variable transmission according to one embodiment of the present invention, FIG. 3 is an exploded perspective view of a continuously variable transmission according to one embodiment of the present invention, and FIG. 4 is a lower view of a continuously variable transmission according to one embodiment of the present invention. 1 to 4, a continuously variable transmission according to one embodiment of the present invention can continuously change a speed ratio, which is a ratio between a first rotation speed of a driving shaft S1 rotated by a power transmission device M and a second rotation speed of a driven shaft S2 to which power generated from the power transmission device M is ultimately transmitted, without any speed change shock. To this end, the continuously variable transmission according to one embodiment of the present invention may include a driving pulley unit 110, a chain unit B, a driven pulley unit 120, a support unit 130, a lifting unit 140, and a tension adjusting unit 150.

[0028] The driving pulley unit 110 is coupled to a power generating device M, and can rotate with a first rotation radius and a first rotation speed by the power generated by the power generating device M.

[0029] Specifically, the power generating device M may be coupled to one end of a circular bar-shaped driving shaft S1, and the driving pulley unit 110 may be coupled to the other end of the driving shaft S1.

[0030] Here, the power generating device M may be a motor or an engine.

[0031] As a result, the driving shaft S1 is rotated by the power generated by the power generating device M, and the driving pulley unit 110 coupled to the driving shaft S1 can be rotated.

[0032] The driving pulley part 110 may be formed in a disk shape, and the other end of the driving shaft S1 may be coupled to the center of the upper surface.

[0033] In addition, one side of the chain portion B may be hooked onto a part of the outer surface of the driving pulley portion 110.

[0034] Specifically, the driving pulley portion 110 may have teeth formed on its outer surface to hook one side of the chain portion B.

[0035] More specifically, the chain portion B may be hooked onto teeth formed on the outer surface of the driving pulley portion 110, and the chain portion B may be hooked onto only some of the teeth as the driving pulley portion 110 rotates.

[0036] As a result, when the power generating device M operates, the driving shaft S1 and the driving pulley portion 110 rotate, and the chain portion B, one side of which is hooked on the driving pulley portion 110, can rotate.

[0037] On the other hand, the first rotation radius of the driving pulley portion 110 may be the circumferential length of the driving pulley portion 110 formed of a disk. Also, the first rotation speed of the driving pulley portion 110 may be the rotation speed of the driving pulley portion 110 formed of a disk.

[0038] In this case, since the driving pulley unit 110 is coupled to the power generating unit M by the driving shaft S1, it may rotate at the same rotation speed as the rotation speed of the power generating unit M. In other words, the first rotation speed of the driving pulley unit 110 may be the same as the rotation speed of the power generating unit M.

[0039] The driven pulley unit 120 may be coupled to the other end of the driven shaft S2 to which the power generated by the power generating device M is ultimately transmitted.

[0040] As a result, when the driven pulley portion 120 rotates, the driven shaft S2 can also rotate.

[0041] On the other hand, the other side of the chain portion B may be caught on a part of the outer surface of the driven pulley portion 120.

[0042] Specifically, the driven pulley portion 120 may have teeth formed on its outer surface to hook onto the other side of the chain portion B.

[0043] More specifically, the chain portion B is caught on teeth formed on the outer surface of the driven pulley portion 120, but the chain portion B may be caught on only some of the teeth as the driven pulley portion 120 rotates.

[0044] As a result, when the driving shaft S1 is rotated by the power generating device M, the driving pulley part 110 rotates, and when the driving pulley part 110 rotates, the chain B hooked to the driving pulley part 110 and the driven pulley part 120 hooked to the chain part B also rotate, and finally the driven shaft S2 connected to the driven pulley part 120 can be rotated.

[0045] In this manner, the driven pulley portion 120 may rotate at a second rotation radius and a second rotation speed.

[0046] Therefore, by being coupled with the driven pulley portion 120, the driven shaft S2 can be rotated at the second rotation speed in the same manner as the driven pulley portion 120.

[0047] In this case, one end of the driven shaft S2 may be coupled with a device that receives power and drives, such as a wheel or other gear.

[0048] Meanwhile, the shape of the driven pulley part 120 changes in response to the movement of the support part 130, which supports the lower part of the driven pulley part 120, so that the second rotation radius and the second rotation speed can be changed.

[0049] Specifically, when the shape of the driven pulley portion 120 changes and the second rotation radius changes, the second rotation speed also changes, and by changing the second rotation speed, the gear ratio, which is the ratio between the first rotation speed and the second rotation speed of the driving pulley portion 110, can also be changed.

[0050] More specifically, when the shape of the driven pulley portion 120 is changed to increase the second radius of rotation, the second rotation speed decreases, and the gear ratio can also decrease.

[0051] Conversely, when the shape of the driven pulley portion 120 is changed to shorten the second radius of rotation, the second rotation speed increases, and the speed ratio can also increase.

[0052] The detailed configuration of the driven pulley portion 120 will be described below.

[0053] The driven pulley portion 120 may include a rotating plate 121 , a plurality of rotating shafts 122 , a plurality of support shafts 125 , a plurality of rotating holders 127 , and a plurality of rotating balls 128 .

[0054] The rotary plate 121 may be coupled to the other end of the driven shaft S2 described above.

[0055] The rotation plate 121 may be formed in a disk shape, and the other end of the driven shaft S2 may be coupled to the center of the upper surface.

[0056] The plurality of rotating shafts 122 extend from the rotating plate 121 and may be positioned on the same plane as the rotating plate 121 .

[0057] That is, the plurality of rotary shafts 122 may be formed in straight lines radiating from the rotary plate 121 .

[0058] For example, the number of the rotary shafts 122 may be 12, and the rotary shafts 122 may be formed to extend from the rotary plate 121 so that adjacent rotary shafts 122 form an angle of 30 degrees.

[0059] Each of the plurality of rotary shafts 122 may be provided with a protruding shaft 123 that protrudes in a direction away from the rotary plate 121 so that the length thereof is variable.

[0060] The protruding shaft 123 protrudes from inside the rotating shaft 122 in a direction parallel to the longitudinal direction of the rotating shaft 122 and in a direction away from the rotating plate 121, and can change the overall length of the rotating shaft 122.

[0061] Conversely, the protruding shaft 123 is inserted inside the rotating shaft 122 to allow the overall length of the rotating shaft 122 to be shortened or adjusted.

[0062] On the other hand, teeth 124 may be formed on the end of the protruding shaft 123, which is the end of the plurality of rotary shafts 122, so that the other side of the chain part B can be hooked.

[0063] As a result, when chain portion B, one side of which is hooked onto driving pulley portion 110, rotates due to the rotation of driving pulley portion 110, a rotational force is applied to tooth 124 on which the other side of chain portion B is hooked, and the protruding shaft 123, rotating shaft 122, rotating plate 121, and driven shaft S2 can also rotate.

[0064] In this case, the rotation radius of the teeth 124 rotated by the chain portion B can be defined as the second rotation radius of the driven pulley portion 120, and the rotation speed of the teeth 124 can be defined as the second rotation speed of the driven pulley portion 120.

[0065] Meanwhile, the plurality of support shafts 125 may be formed to extend from the lower portions of the teeth 124 of the plurality of rotation shafts 122 in a direction toward the support portion 130 .

[0066] A hemispherically shaped rotary holder 127 may be fastened to each end of the plurality of support shafts 125, and a plurality of rotary balls 128 may be rotatably coupled to each of the plurality of rotary holders 127.

[0067] In this case, the plurality of rotating balls 128 may be supported by the support portion 130 while being in contact with the inclined side surface of the support portion 130 .

[0068] As a result, when the rotary holder 127 moves, the rotary ball 128 is coupled to the inside of the rotary holder 127 and can rotate due to the frictional force with the support part 130 .

[0069] That is, the plurality of rotating balls 128 are supported in contact with the inclined side surface of the support part 130, and can rotate in a state coupled with the rotating holder 127 when the rotating holder 127 moves.

[0070] As a result, when chain portion B, one side of which is hooked onto driving pulley portion 110, rotates due to the rotation of driving pulley portion 110, a rotational force is applied to tooth 124 on which the other side of chain portion B is hooked, and the multiple support shafts 125, multiple rotating holders 127, and multiple rotating balls 128 can also rotate.

[0071] In this case, the rotating ball 128 may not only rotate around the driven axis S2 as a rotating shaft, like the rotating plate 121, the multiple rotating shafts 122, the protruding shaft 123, the multiple rotating teeth 124, the multiple support shafts 125, and the multiple rotating holders 127, but may also rotate around the central axis as a rotating shaft, just like the Earth rotates on its axis.

[0072] Meanwhile, support teeth 126 on which the chain portion B can be hooked, like the rotating teeth 124, may be formed at the ends of the plurality of support shafts 125. Such support teeth 126 will be described later.

[0073] The support portion 130 supports the lower portion of the rotating driven pulley portion 120, and may be moved in a first direction toward the driven pulley portion 120 while in contact with the driven pulley portion 120, or in a second direction opposite to the first direction.

[0074] Specifically, the support portion 130 may be formed in a cylindrical or conical shape with different diameters on the upper and lower surfaces, and may be positioned between the plurality of rotating balls 128, with its inclined sides supporting the plurality of rotating balls 128.

[0075] That is, the support part 130 may be formed so that the cross-sectional area of ​​the support part 130 becomes narrower from the upper surface to the lower surface.

[0076] In order for the support part 130 to move in the first direction or the second direction, the lifting part 140 is coupled to the lower surface of the support part 130 and can move the support part 130 in the first direction or the second direction.

[0077] For this purpose, the lifting unit 140 may be provided with a power device such as a motor.

[0078] FIG. 5 is a side view of a continuously variable transmission according to one embodiment of the present invention, and FIG. 6 is a top view of a continuously variable transmission according to one embodiment of the present invention.

[0079] 5 and 6, the cross-sectional area of ​​the support portion 130, which is flush with the plurality of rotating balls 128 supported on its side surface, may increase as the support portion 130 moves in the first direction.

[0080] Therefore, as the support portion 130 moves in the first direction, the cross-sectional area of ​​the support portion positioned on the same plane increases, and the distance between the plurality of rotating balls 128 may become longer.

[0081] As a result, the mutual distance between the plurality of rotary holders 127, the plurality of support shafts 125, and the plurality of rotary teeth 124 also increases, causing the plurality of protruding shafts 123 to protrude, and the overall length of the plurality of rotary shafts 122 can be extended or adjusted.

[0082] Therefore, by increasing the second rotation radius of the driven pulley portion 120, the second rotation speed of the driven pulley portion 120 decreases, and the speed ratio of the continuously variable transmission can be reduced.

[0083] FIG. 7 is a side view illustrating the process of changing the speed ratio of a continuously variable transmission according to one embodiment of the present invention, and FIG. 8 is a top view illustrating the process of changing the speed ratio of a continuously variable transmission according to one embodiment of the present invention.

[0084] 7 and 8, as the support portion 130 moves in the second direction, the cross-sectional area of ​​the cross-section located on the same plane as the plurality of rotating balls 128 supported on the side surface may decrease.

[0085] Therefore, as the support parts 130 move in the second direction, the cross-sectional area of ​​the cross-sections of the support parts positioned on the same plane decreases, and the spacing distance between the plurality of rotating balls 128 may become shorter.

[0086] As a result, the mutual distance between the multiple rotary holders 127, the multiple support shafts 125, and the multiple rotary teeth 124 is successively shortened, causing the multiple protruding shafts 123 to protrude, and the overall length of the multiple rotary shafts 122 can be shortened or adjusted.

[0087] Therefore, by shortening the second rotation radius of the driven pulley portion 120, the second rotation speed of the driven pulley portion 120 decreases, and the speed ratio of the continuously variable transmission can be increased.

[0088] On the other hand, the tension adjusting unit 150 may move the chain portion B outward or inward so that the tension of the chain portion B maintains a predetermined reference tension.

[0089] For example, when the second turning radius becomes longer, chain part B may be moved inward to prevent excessive tension from being applied to chain part B, and when the second turning radius becomes shorter, chain part B may be moved outward to prevent the tension in chain part B from becoming excessively low.

[0090] FIG. 9 is a top perspective view of a continuously variable transmission according to another embodiment of the present invention.

[0091] The continuously variable transmission according to another embodiment of the present invention may further include an elastic belt B', as compared with the continuously variable transmission according to the one embodiment.

[0092] Therefore, repeated explanations will be omitted.

[0093] Such an elastic belt B' may be hooked onto support teeth 126 formed on the ends of a plurality of support shafts 125 and rotate together with the support teeth 126.

[0094] As a result, the elastic belt B' can prevent the plurality of rotating balls 128 from separating from the side surface of the support part 130 without maintaining contact with the side surface of the support part 130 during rotation.

[0095] For this purpose, the elastic belt B' may be made of an elastic material so as to be caught by the plurality of support teeth 126 having different mutual separation distances in accordance with the movement of the support part 130.

[0096] FIG. 10 is a top perspective view of a continuously variable transmission according to another embodiment of the present invention.

[0097] The continuously variable transmission according to the other embodiment of the present invention may differ from the continuously variable transmission according to the other embodiment only in the positions of the chain portion B and the elastic belt B'.

[0098] Therefore, repeated explanations will be omitted.

[0099] One side of the chain portion B is hooked onto the outer surface of the driving pulley portion 110, but the other side does not hook onto the multiple rotating teeth 124 of the driven pulley portion 120, but may hook onto the support teeth 126 formed on the ends of the multiple support shafts 125, causing the support teeth 126 to rotate.

[0100] This prevents the plurality of rotating balls 128 from separating from the side of the support part 130 while rotating via the chain part B rather than the elastic belt B'.

[0101] Furthermore, the elastic belt B' may not be caught on the support teeth 126 formed on the ends of the support shafts 125, but may be caught on the rotation teeth 124 of the driven pulley portion 120 and rotated together.

[0102] As a result, the elastic belt B' can firmly maintain the angular separation between the multiple rotating shafts 122 while the multiple rotating shafts 122 are rotating, thereby preventing collisions between the multiple rotating shafts 122.

[0103] The present invention has been described above with a focus on preferred embodiments. Those skilled in the art will understand that the present invention can be embodied in modified forms without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is defined by the claims, not the foregoing description, and all variations within the scope of equivalents thereto should be construed as being within the scope of the present invention.

[0104] As described above, the present invention has been described using limited examples and drawings, but the present invention is not limited thereto, and it goes without saying that various modifications and variations can be made by a person having ordinary skill in the art to which the present invention pertains within the technical spirit of the present invention and the equivalent scope of the claims set forth below. [Explanation of symbols]

[0105] 110 Driving pulley part 120 Driven pulley section 130...Support part 140 Lifting section 150...Tension adjustment section B Chain section B' Elastic belt

Claims

1. a driving pulley unit coupled to a power generating device and configured to rotate with a first rotation radius and at a first rotation speed by power generated by the power generating device; a driven pulley portion, one side of which is hooked on a portion of the outer surface of the driving pulley portion and the other side of which is hooked on a portion of the outer surface of the driving pulley portion, and which rotates at a second rotation radius and a second rotation speed; a support portion that supports a lower portion of the rotating driven pulley portion, and that moves in a first direction toward the driven pulley portion while in contact with the driven pulley portion, or in a second direction opposite to the first direction; a tension adjusting unit that adjusts the tension of the chain portion; Including, The driven pulley portion is a rotation plate to which a driven shaft that rotates upon receiving the power is coupled; a plurality of rotating shafts extending from the rotating plate, positioned on the same plane as the rotating plate, having variable lengths and having ends to which the chain portions are hooked; a plurality of support shafts extending from the plurality of rotary shafts in a direction toward the support portion; a plurality of hemispherically shaped rotary holders fastened to the ends of the plurality of support shafts; a plurality of rotating balls rotatably coupled to the plurality of rotating holders, the rotating balls being supported by the support portion while contacting the inclined side surfaces of the support portion; Equipped with The support portion is a cylindrical or conical shape having upper and lower surfaces with different diameters, the cylindrical or conical shape being positioned between the plurality of rotating balls, and the inclined side surfaces supporting the plurality of rotating balls; The shape of the driven pulley portion changes in response to movement of the support portion in the first direction or the second direction, and the second rotation radius is changed to be longer or shorter, thereby changing the second rotation speed, thereby changing the gear ratio, which is the ratio between the first rotation speed of the driving pulley portion and the second rotation speed of the driven pulley portion. Continuously variable transmission.

2. The plurality of rotating balls are As the support portions move in the first direction, the cross-sectional areas of the support portions positioned on the same plane increase, and the mutual separation distance increases; The plurality of rotary holders include: When the mutual separation distance between the plurality of rotating balls is increased, the mutual separation distance is increased, The plurality of support shafts include: When the mutual separation distance between the plurality of rotary holders is increased, the mutual separation distance is increased, The plurality of rotating shafts include: When the mutual separation distance between the plurality of support shafts is increased, the length is variable, so that the second rotation radius is increased and the second rotation speed and the speed ratio are decreased.

2. The continuously variable transmission according to claim 1.

3. The plurality of rotating balls are As the support portions move in the second direction, the cross-sectional areas of the support portions positioned on the same plane decrease, and the mutual separation distance becomes shorter; The plurality of rotary holders include: When the mutual separation distance between the plurality of rotating balls is shortened, The plurality of support shafts include: When the mutual separation distance between the plurality of rotary holders is shortened, The plurality of rotating shafts include: When the mutual separation distance between the plurality of support shafts is reduced, the length of the support shafts is reduced, thereby reducing the second rotation radius and increasing the second rotation speed and the speed ratio.

3. The continuously variable transmission according to claim 2.

Images