Continuously variable transmission

Abstract

The utility model relates to the technical field of transmissions, and discloses a continuously variable transmission, which comprises a first wheel assembly with a first blade and a second wheel assembly with a second blade, at least one of the first wheel assembly and the second wheel assembly can be adjusted to move axially relative to the other, so that the first blades and the second blades are in transmission joint at different radial positions. According to the continuously variable transmission, one of the first wheel assembly and the second wheel assembly is axially moved, so that the transmission joint position between the first blade and the second blade is changed, and the ratio of the power input force arm to the power output force arm of the first wheel assembly to the power output force arm of the second wheel assembly is changed; finally, the output speed of the continuously variable transmission is changed, and continuously variable transmission is achieved. Meanwhile, the continuously variable transmission further has the advantages of being small and exquisite in structure, low in manufacturing and maintenance cost and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of transmissions, in particular to a continuously variable transmission. Background Art

[0002] Transmissions are required in the fields of automobile manufacturing, motorcycle manufacturing, bicycle manufacturing, industrial machinery manufacturing, reducer manufacturing, etc. However, the transmissions used in these many fields have defects such as high manufacturing and maintenance costs, complex structures, or low transmission efficiency. For example, in the field of automobile manufacturing, the E-CVT electronic automatic transmission is a double cone and high-toughness steel belt structure that can continuously change the transmission ratio, has good transmission smoothness, and good fuel economy. The disadvantages are: limited torque bearing, complex structure, and high manufacturing cost; DCT dual-clutch transmission has low comfort, high failure rate, and relatively high maintenance cost; AT hydraulic automatic transmission has low transmission efficiency, complex structure, and high price. In the field of bicycle manufacturing, the transmission usually cannot achieve stepless speed change, and the sense of frustration when riding and shifting gears is obvious, and the speed can only be changed when the foot is stepped on the middle axis to rotate while riding, which is very inconvenient to use. In the field of motorcycle manufacturing, the automatic separation continuously variable transmission used has poor speed change ability and weak stability, and there will be adverse reactions such as shaking, slipping and abnormal noise during use. In the field of industrial robot and intelligent robot manufacturing, reducers are the core components of robot movement. Small mobile robots, in particular, have higher requirements for speed, efficiency and load capacity. CVTs have the advantage of being able to continuously change the transmission ratio, which can effectively solve the adaptability problem of small mobile robots under complex road conditions. However, small mobile robots limit the size and weight of CVTs, making most existing CVTs unable to be directly applied to them. In the field of reducer manufacturing, the commonly used harmonic reducer flexible wheels are prone to fatigue damage, have large moment of inertia and starting torque, and are difficult to manufacture and have complex process flows; RV reducers are greatly affected by process and assembly, have high requirements for gear wear resistance and high rigidity, and require special component processing and precision assembly technology; planetary reducers and cycloid reducers cannot withstand large loads, are troublesome to disassemble and assemble, and have high maintenance costs. Utility Model Content

[0003] The purpose of the utility model is to overcome at least one of the above-mentioned technical problems existing in the prior art and to provide a continuously variable transmission having the characteristics of simple structure, small size, stable and reliable power transmission, wide application range, etc.

[0004] The utility model provides a continuously variable transmission, comprising a first wheel assembly with a first blade and a second wheel assembly with a second blade, wherein the first blade and the second blade are coaxially arranged with each other and nested and meshed with each other, and at least one of the first wheel assembly and the second wheel assembly can be adjusted to move axially relative to the other so that the first blade and the second blade are transmission-engaged at different radial positions.

[0005] The continuously variable transmission provided by the utility model is provided by coaxially arranging the first blade of the first wheel assembly and the second blade of the second wheel assembly and mutually nesting and meshing, when the first wheel assembly moves axially relative to the second wheel assembly, or when the second wheel assembly moves axially relative to the first wheel assembly, the engagement position of the first blade and the second blade changes, when the first blade or the second blade is connected to the power input end, the first blade and the second blade start to rotate, and the first blade and the second blade are driven and combined at different radial positions, which will change the ratio of the power input lever arm and the power output lever arm of the first wheel assembly and the second wheel assembly, thereby changing the torque output by the continuously variable transmission, and finally changing the output speed of the continuously variable transmission. Moreover, since the change of the engagement position of the first blade and the second blade is a continuous change process, the change of the output speed of the continuously variable transmission provided by the utility model is also continuous, and no obvious sense of frustration will be generated. In addition, the continuously variable transmission provided by the utility model also has the advantages of compact structure, low manufacturing and maintenance costs, can adapt to different installation space requirements, to meet the production and installation requirements of different manufacturing fields, and a wide range of applications.

[0006] Optionally, the first wheel assembly has a plurality of first blades evenly arranged along a rotation plane of the first wheel assembly, the second wheel assembly has a plurality of second blades evenly arranged along a rotation plane of the first wheel assembly, and the number of the first blades is the same as the number of the second blades.

[0007] Optionally, the first wheel assembly is transmission-connected to the power input end, and the second wheel assembly is transmission-connected to the output end of the continuously variable transmission; or, the second wheel assembly is transmission-connected to the power input end, and the first wheel assembly is transmission-connected to the output end of the continuously variable transmission.

[0008] Optionally, the continuously variable transmission provided by the utility model also includes a screw, a first bearing for supporting the screw arranged at both ends of the screw, an inner sleeve threadedly connected to at least part of the screw, and an outer sleeve sleeved outside the inner sleeve, wherein a third bearing is arranged in the annular space formed between the inner sleeve and the outer sleeve, and the first blade is connected to one end of the outer sleeve close to the second wheel assembly.

[0009] Optionally, the continuously variable transmission provided by the utility model further includes a first gear disposed on the screw rod for driving the screw rod to rotate.

[0010] Optionally, the first wheel assembly comprises a first ring detachably arranged on an end of the first blade away from the screw rod.

[0011] Optionally, the second wheel assembly includes a second ring detachably provided on an end portion of the second blade close to the screw rod, and a gap is formed between the second ring and the outer sleeve.

[0012] Optionally, the continuously variable transmission provided by the utility model also includes a second gear supported on the screw rod by a second bearing and a third gear engaged with the outer sleeve in circumferential transmission and axially slidingly matched, the end of the second blade away from the screw rod is connected to the second gear, and the third gear is configured to allow the first blade to move between different axial positions, wherein the second gear is configured as the power input end of the continuously variable transmission and the third gear is configured as the power output end of the continuously variable transmission, or the third gear is configured as the power input end of the continuously variable transmission and the second gear is configured as the power output end of the continuously variable transmission.

[0013] Optionally, the first blade and the second blade are fan-shaped, and the arc-shaped side of the fan-shaped blade is arranged at the end of the first blade and the second blade away from the screw rod.

[0014] Optionally, the first blade and / or the second blade is arranged to be inclined relative to the screw rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an implementation mode of a continuously variable transmission provided by the utility model;

[0016] Figure 2 It is a three-dimensional schematic diagram of an implementation mode of a continuously variable transmission provided by the utility model;

[0017] Figure 3 yes Figure 2 Exploded view of a continuously variable transmission.

[0018] Description of Reference Numerals

[0019] 1-screw; 2-first bearing; 3-first gear; 4-second gear; 5-second bearing; 6-blade connector; 7-second ring; 8-first ring; 9-third bearing; 10-screw thread; 11-third gear; 12-inner sleeve; 13-outer sleeve; A-first wheel assembly; B-second wheel assembly. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0021] In the present utility model, unless otherwise specified, the directions or positional relationships indicated by terms such as "up, down, left, right, inside, outside, top, bottom" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0022] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The continuously variable transmission disclosed in the present utility model is described below with reference to the accompanying drawings.

[0025] Reference Figure 1As shown, the continuously variable transmission provided by the utility model comprises a first wheel assembly A having a first blade and a second wheel assembly B having a second blade, wherein the first blade and the second blade are coaxially arranged and mutually nested and meshed, wherein the first blade and the second blade are alternately distributed on the rotation plane where the positions where the first blade and the second blade are engaged are located in a mutually nested and meshed state. And at least one of the first wheel assembly A and the second wheel assembly B can be adjusted to move axially relative to the other, that is, the first wheel assembly A can move axially relative to the second wheel assembly B, or the second wheel assembly B can move axially relative to the first wheel assembly A, and in the above-mentioned axial movement process, the transmission engagement position of the first blade and the second blade moves in the radial direction. When the first blade or the second blade is connected to the power input end, the first blade and the second blade start to rotate, therefore, in the above-mentioned continuous change of the transmission engagement position, the ratio of the power input lever arm of the first wheel assembly A and the second wheel assembly B to the power output lever arm changes, thereby causing the torque output by the continuously variable transmission to change, and finally causing the output speed of the continuously variable transmission to change. Moreover, since the change of the engagement position of the first blade and the second blade is a continuous change process, the output speed of the continuously variable transmission provided by the utility model is also changed continuously, and no obvious sense of frustration is generated, thereby realizing continuously variable speed change. In addition, the continuously variable transmission provided by the utility model also has the advantages of compact structure, low manufacturing and maintenance costs, and can adapt to different installation space requirements to meet the production and installation requirements of different manufacturing fields, and has a wide range of applications.

[0026] As mentioned above, in the continuously variable transmission provided by the present invention, the transmission connection relationship between the power input end and the power output end and the first wheel assembly A and the second wheel assembly B can be set as: the first wheel assembly A is transmission connected to the power input end of the continuously variable transmission, and the second wheel assembly B is transmission connected to the power output end of the continuously variable transmission; or, the second wheel assembly B is transmission connected to the power input end of the continuously variable transmission, and the first wheel assembly A is transmission connected to the power output end of the continuously variable transmission.

[0027] According to a preferred embodiment of the utility model, the first wheel assembly A has a plurality of first blades uniformly arranged along the rotation plane of the first wheel assembly A, the second wheel assembly B has a plurality of second blades uniformly arranged along the rotation plane of the first wheel assembly B, and the number of the first blades is the same as the number of the second blades. Of course, the number of the first blades and the number of the second blades may also be different, for example, the number of the first blades is twice the number of the second blades, and the second blades are arranged at intervals in the gaps formed by the first blades, which is equivalent to every two first blades clamping one second blade; or the number of the second blades is twice the number of the first blades, in which case the first blades are arranged at intervals in the gaps formed by the second blades, which is equivalent to every two second blades clamping one first blade.

[0028] In one embodiment of the continuously variable transmission of the present invention, for example, a shift lever can be provided, and the first wheel assembly A can be driven to move axially relative to the second wheel assembly B by moving the shift lever, or the second wheel assembly B can be driven to move axially relative to the first wheel assembly A by moving the shift lever. The shift lever can be provided outside the rotation radius of the first wheel assembly A or the second wheel assembly B to prevent the shift lever from interfering with the rotation of the first wheel assembly A and the second wheel assembly B.

[0029] Or, preferably, refer to Figure 1 As shown, the continuously variable transmission provided by the utility model also includes a screw 1, a first bearing 2 provided at both ends of the screw 1 for supporting the screw 1, an inner sleeve 12 threadedly connected to at least part of the screw 1, and an outer sleeve 13 sleeved outside the inner sleeve 12, wherein a third bearing 9 is provided in the annular space formed between the inner sleeve 12 and the outer sleeve 13, and the first blade is connected to one end of the outer sleeve 13 close to the second wheel assembly B. Figure 1 As shown, at least part of the screw 1 is formed with a screw thread 10, which is threadedly connected to the inner sleeve 12, and the length of the screw thread 10 is at least greater than or equal to the moving stroke of the first wheel assembly A. In addition, a plurality of second bearings 9 can be arranged in the annular space formed between the inner sleeve 12 and the outer sleeve 13, and the plurality of second bearings 9 are arranged at least at both ends of the annular space.

[0030] Of course, the screw rod 1 can be connected to the output shaft of the motor through a coupling, and the motor is used to drive the screw rod 1 to rotate, so that the inner sleeve 12 moves axially, and drives the outer sleeve 13 and the first wheel assembly A to move axially.

[0031] Or, according to the preferred embodiment of the continuously variable transmission of the utility model, in combination with Figure 1 As shown, the continuously variable transmission also includes a first gear 3 disposed on the screw rod 1 for driving the screw rod 1 to rotate. For example, the first gear 3 is connected to an external driving gear through a transmission, and the driving gear drives the first gear 3 to rotate, thereby driving the screw rod 1 to rotate. Figure 1 As shown, the first gear 3 can be installed on the inner side of the first bearing 2 at the end of the screw rod 1, that is, on the side of the first bearing 2 close to the first wheel assembly A.

[0032] Reference Figure 1As shown, according to a preferred embodiment of the continuously variable transmission of the utility model, the continuously variable transmission also includes a second gear 4 supported on the screw 1 by a second bearing 5 and a third gear 11 engaged with the outer sleeve 13 in circumferential transmission and axially slidingly matched, the end of the second blade away from the screw 1 is connected to the second gear 4, and the third gear 11 is configured to allow the first blade to move between different axial positions, wherein the second gear 4 is configured as a power input end of the continuously variable transmission, and the third gear 11 is configured as a power output end of the continuously variable transmission, or the third gear 11 is configured as a power input end of the continuously variable transmission, and the second gear 4 is configured as a power output end of the continuously variable transmission.

[0033] Specifically, at least part of the outer peripheral wall of the outer sleeve 13 is formed with a protruding key bar, the axial length of which is greater than or equal to the moving stroke of the first wheel assembly A, and the inner surface of the gear mounting hole of the third gear 11 is formed with a corresponding groove, through which, on the one hand, the third gear 11 rotates together with the outer sleeve 13; on the other hand, the outer sleeve 13 can slide axially relative to the third gear 11. Figure 1 As shown, the first gear 3 is externally connected to a driving gear, which drives the first gear 3 to rotate, driving the screw 1 to rotate, so that the inner sleeve 12, the outer sleeve 13 and the first wheel assembly A move axially, and the outer sleeve 13 moves axially relative to the third gear 11; at the same time, when the second gear 4 serves as the power input end of the continuously variable transmission, it drives the second wheel assembly B to rotate, driving the first wheel assembly A and the outer sleeve 13 to rotate, and then driving the third gear 11 to rotate, completing the transmission of power from the second gear 4 to the third gear 11. In addition, as Figure 1 As shown, the first gear 3 can be installed at a position of the screw rod 1 between the first bearing 2 and the second bearing 5. Of course, the first gear 3 can be set at any position between the two first bearings 2 on the screw rod 1, as long as it can drive the screw rod 1 to rotate.

[0034] The working principle of the continuously variable transmission provided by the utility model is further described by setting the second gear 4 as the power input end of the continuously variable transmission, the third gear 11 as the power output end of the continuously variable transmission, and the first wheel assembly A moves axially relative to the second wheel assembly B. Figure 1 As shown, during the process of the second gear 4 driving the second wheel assembly B to rotate, the second wheel assembly B is subjected to a rotational force F exerted by the second gear 4. B , the second wheel assembly B and the first wheel assembly A are engaged with each other in the meshing position. In the meshing position, the rotational force on the first wheel assembly A is F A , F A With F B When the first wheel assembly A is relative to the second wheel assembly B, Figure 1The vertical distance L from the meshing position on the first wheel assembly A to the outer sleeve 13 is axially moved from right to left. A Gradually decreases, the vertical distance L A It is the turning force arm of the first wheel assembly A, and the turning torque transmitted from the second wheel assembly B to the first wheel assembly A is F A ×L A Therefore, the first wheel assembly A is relative to the second wheel assembly B. Figure 1 During the axial movement from right to left (i.e. the first wheel assembly A moves from Figure 1 The torque of the first wheel assembly A transmitted by the second wheel assembly B gradually decreases. According to the lever principle, the torque of the first wheel assembly A is equal to the torque of the outer sleeve 13, and the torque of the outer sleeve 13 is equal to the torque of the third gear 11. Therefore, during the axial movement of the first wheel assembly A, the torque output by the third gear 11 gradually decreases. Similarly, when the first wheel assembly A is relative to the second wheel assembly B, Figure 1 During the axial movement from left to right, the torque output by the third gear 11 gradually increases. Therefore, the continuously variable transmission provided by the utility model changes the meshing position of the first blade and the second blade by adjusting the axial movement of the first wheel assembly A relative to the second wheel assembly B, thereby changing the torque output by the continuously variable transmission, and finally changing the output speed of the continuously variable transmission.

[0035] The above describes in detail an implementation scheme in which the second gear 4 is set as the power input end of the continuously variable transmission, the third gear 11 is set as the power output end of the continuously variable transmission, and the first wheel assembly A moves axially relative to the second wheel assembly B. Similarly, in another implementation scheme of the continuously variable transmission of the present utility model, the second wheel assembly B may move axially relative to the first wheel assembly A. For example, the position of the screw thread 10 of the screw 1 is adjusted, and the length of the screw thread 10 is made greater than the axial movement stroke of the second wheel assembly B. At the same time, an inner sleeve is provided on the inner side of the second bearing 5, and the inner sleeve is threadedly connected with the screw thread 10. An outer sleeve is sleeved on the outer side of the second gear 4, and a groove matching the teeth of the second gear 4 is formed on the inner wall of the outer sleeve. One end of the outer sleeve forms an end face with a hollow circle, and the size of the hollow circle is the same as the outer diameter of the first bearing 2, so that the outer sleeve is connected to the outer ring of the first bearing 2 through the end face. Through the above connection relationship, the inner sleeve drives the second gear 4 to move axially, thereby realizing the axial movement of the second wheel assembly B relative to the first wheel assembly A. Of course, in another embodiment of the continuously variable transmission of the present invention, the second gear 4 can be set as the power input end of the continuously variable transmission, and the third gear 11 can be set as the power output end of the continuously variable transmission, which will not be elaborated here.

[0036] In addition, as mentioned above, the first blade is connected to the outer sleeve 13, and during the rotation process, the force arm L of the first blade A is the vertical distance from the meshing position of the first wheel assembly A and the second wheel assembly B to the outer sleeve 13. In some other embodiments of the present invention, the first blade can also be connected to the inner sleeve 12. In this way, during the rotation process, the lever arm L of the first blade A The vertical distance from the meshing position of the first wheel assembly A and the second wheel assembly B to the inner sleeve 12 is approximately the lever arm L of the first blade. A becomes the vertical distance from the meshing position of the first wheel assembly A and the second wheel assembly B to the screw 1, so this transmission mode is called the "central axis transmission" mode. Figure 1 As shown, one end of the first blade is connected to the end of the inner sleeve 12 close to the second gear 4, and the first blade remains non-contacting with the outer sleeve 13. There are multiple ways to connect the first blade to the inner sleeve 12. For example, the axial length of the inner sleeve 12 is greater than the axial length of the outer sleeve 13, so that the end of the inner sleeve 12 close to the second gear 4 protrudes relative to the outer sleeve 13, and the first blade extends in the direction toward the screw 1 and is connected to the end of the inner sleeve 12 close to the second gear 4. In the central shaft transmission mode, the third gear 11 and the outer sleeve 13 are adjusted from the original sliding fit to the threaded fit, that is, the key strip on the outer peripheral wall of the outer sleeve 13 is adjusted to a thread, and the inner surface of the mounting hole of the third gear 11 is formed with a corresponding thread. In this way, when the third gear 11 rotates, the outer sleeve 13 moves in the axial extension direction, thereby driving the inner sleeve 12 and the first wheel assembly A to move together. At the same time, in order to enable the inner sleeve 12 and the first wheel assembly A to move in the axial direction, the original threaded connection between the screw 1 and the inner sleeve 12 is adjusted to a sliding fit. Specifically, a plurality of key strips protruding in the radial direction are provided on the inner wall of the inner sleeve 12, and the thread on the screw 1 is adjusted to a keyway corresponding to the key strips on the inner wall of the inner sleeve 12. Through the above adjustment, when the third gear 11 rotates, the outer sleeve 13 is driven to rotate and move axially. Since the inner sleeve 12 and the screw 1 are in sliding fit, when the third gear 11 rotates, the outer sleeve 13, the inner sleeve 12 and the first wheel assembly A move axially along the extension direction of the screw 1 together, thereby changing the meshing position of the first blade and the second blade, and then changing the magnitude of the force arm when the first blade rotates, and finally achieving a change in the output torque. Moreover, compared with the aforementioned conventional transmission mode (i.e., the transmission mode in which the first blade is connected to the outer sleeve 13), when the first blade and the second blade are in the same meshing position, the moment arm of the first blade in the central shaft transmission mode is greater than the moment arm of the first blade in the conventional transmission mode, so that the final output torque of the central shaft transmission mode of the continuously variable transmission is greater than the output torque of the conventional transmission mode.

[0037] In the center shaft transmission mode, the third gear 11 is set as a gear for controlling the axial movement of the outer sleeve 13, the inner sleeve 12 and the first wheel assembly A. At this time, the first gear 3 can be set as the power input end of the continuously variable transmission, and the second gear 4 can be set as the power output end of the continuously variable transmission; or the second gear 4 is set as the power input end of the continuously variable transmission, and the first gear 3 can be set as the power output end of the continuously variable transmission.

[0038] Reference Figure 1 As shown, the first wheel assembly A may include a first ring 8 detachably provided at the end of the first blade away from the screw 1, thereby enhancing the structural strength of the first wheel assembly A. Further, the second wheel assembly B may include a second ring 7 detachably provided at the end of the second blade close to the screw 1, and a gap is formed between the second ring 7 and the outer sleeve 13 to prevent the second blade from interfering with the outer sleeve 13 during rotation.

[0039] In addition, the shapes of the first blade and the second blade can be long strips, inverted triangles, etc., preferably fan-shaped, and the arc side of the fan-shaped is arranged at the ends of the first blade and the second blade away from the screw rod 1. The diameter and thickness of the first blade and the second blade can be adjusted according to the size of the transmitted torque of the actual application working condition.

[0040] Optionally, the end of the second blade away from the screw rod 1 is directly fixedly connected to the second gear 4, or the second blade is bent so that the end of the second blade away from the screw rod 1 forms a bent portion, and the bent portion is fixedly connected to the second gear 4. Figure 1 As shown, according to a preferred embodiment of the utility model, the second blade also includes a blade connector 6, one end of the blade connector 6 is connected to the end of the second blade away from the screw rod 1, and the other end is connected to the second gear 4. Of course, the connection between the other end and the second gear 4 can be adhesive, welding or threaded connection.

[0041] In addition, the first blade can be set perpendicular to the central axis of the screw rod 1 or inclined relative to the central axis of the screw rod 1. Of course, the second blade can be set perpendicular to the central axis of the screw rod 1 or inclined relative to the central axis of the screw rod 1.

[0042] In addition, it should be noted that the continuously variable transmission provided by the present invention can be used alone, or multiple continuously variable transmissions can be used in combination according to actual needs, for example, multiple continuously variable transmissions can be connected in series or in parallel to meet different output requirements.

[0043] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any appropriate manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A continuously variable transmission, characterized in that: The invention comprises a first wheel assembly having a first blade and a second wheel assembly having a second blade, wherein the first blade and the second blade are coaxially arranged and nested and meshed with each other, and at least one of the first wheel assembly and the second wheel assembly can be adjusted to move axially relative to the other so that the first blade and the second blade are drivingly engaged at different radial positions.

2. The continuously variable transmission according to claim 1, characterized in that: The first wheel assembly has a plurality of first blades evenly arranged along a rotation plane of the first wheel assembly, the second wheel assembly has a plurality of second blades evenly arranged along a rotation plane of the first wheel assembly, and the number of the first blades is the same as the number of the second blades.

3. The continuously variable transmission according to claim 1, characterized in that: The first wheel assembly is transmission-connected to the power input end of the continuously variable transmission, and the second wheel assembly is transmission-connected to the power output end of the continuously variable transmission; or, the second wheel assembly is transmission-connected to the power input end of the continuously variable transmission, and the first wheel assembly is transmission-connected to the power output end of the continuously variable transmission.

4. The continuously variable transmission according to claim 1, characterized in that: It also includes a screw rod (1), a first bearing (2) disposed at both ends of the screw rod (1) for supporting the screw rod (1), an inner sleeve (12) threadedly connected to at least a portion of the screw rod (1), and an outer sleeve (13) sleeved outside the inner sleeve (12), wherein a third bearing (9) is disposed in an annular space formed between the inner sleeve (12) and the outer sleeve (13), and the first blade is connected to one end of the outer sleeve (13) close to the second wheel assembly.

5. The continuously variable transmission according to claim 4, characterized in that: It also includes a first gear (3) disposed on the screw rod (1) and used for driving the screw rod (1) to rotate.

6. The continuously variable transmission according to claim 4, characterized in that: It also includes a second gear (4) supported on the screw (1) by a second bearing (5) and a third gear (11) engaged with the outer sleeve (13) in circumferential transmission and axially slidingly matched, the end of the second blade away from the screw (1) is connected to the second gear (4), and the third gear (11) is configured to allow the first blade to move between different axial positions, wherein the second gear (4) is configured as the power input end of the continuously variable transmission and the third gear (11) is configured as the power output end of the continuously variable transmission, or the third gear (11) is configured as the power input end of the continuously variable transmission and the second gear (4) is configured as the power output end of the continuously variable transmission.

7. The continuously variable transmission according to claim 1, characterized in that: It also comprises a screw (1), first bearings (2) arranged at both ends of the screw (1) for supporting the screw (1), an inner sleeve (12) engaged with at least part of the screw (1) in circumferential transmission and slidably matched in the axial direction, an outer sleeve (13) sleeved outside the inner sleeve (12), and a third gear (11) threadedly connected to the outer sleeve (13), wherein a third bearing (9) is arranged in an annular space formed between the inner sleeve (12) and the outer sleeve (13), the first blade is connected to one end of the inner sleeve (12) close to the second wheel assembly, and the inner sleeve (12) is arranged to allow the first blade to move between different axial positions; It also includes a second gear (4) supported on the screw rod (1) through a second bearing (5) and a first gear (3) arranged on the screw rod (1), wherein the second gear (4) is arranged as the power input end of the continuously variable transmission, and the first gear (3) is arranged as the power output end of the continuously variable transmission, or the first gear (3) is arranged as the power input end of the continuously variable transmission, and the second gear (4) is arranged as the power output end of the continuously variable transmission.

8. The continuously variable transmission according to claim 4 or 7, characterized in that: The first wheel assembly comprises a first ring (8) detachably arranged on the end of the first blade away from the screw rod (1).

9. The continuously variable transmission according to claim 4 or 7, characterized in that: The second wheel assembly comprises a second ring (7) which is detachably arranged on the end of the second blade close to the screw rod (1), and a gap is formed between the second ring (7) and the outer sleeve.

10. The continuously variable transmission according to claim 4 or 7, characterized in that: The first blade and the second blade are in the shape of a fan, and the arcuate side of the fan is arranged at the end of the first blade and the second blade away from the screw rod (1).

11. The continuously variable transmission according to claim 4 or 7, characterized in that: The first blade and / or the second blade are arranged obliquely relative to the screw rod (1).

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