Continuously variable transmission

Abstract

A continuously variable transmission, comprising a first pulley assembly (A) provided with a first blade and a second pulley assembly (B) provided with a second blade, wherein the first blade and the second blade are coaxially arranged and are nested and mesh with each other; and at least one of the first pulley assembly and the second pulley assembly can be adjusted to axially move relative to the other one, such that the first blade and the second blade are in transmission engagement with each other at different radial positions. By means of axially moving one of the first pulley assembly and the second pulley assembly of the continuously variable transmission, the transmission engagement position between the first blade and the second blade is changed, such that the ratio of a power input force arm length of the first pulley assembly to a power output force arm length of the second pulley assembly is changed, and finally the output speed of the continuously variable transmission is changed, thereby realizing stepless speed change. Moreover, the continuously variable transmission further has the advantages of a compact structure, low manufacturing and maintenance costs and a wide range of application.

Description

continuously variable transmission

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese patent application 202311517681.4 filed on November 15, 2023, Chinese patent application 202410336714.3 filed on March 22, 2024, and Chinese patent application 202420576089.5 filed on March 22, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to the technical field of transmissions, and in particular to a continuously variable transmission. Background Art

[0004] Transmissions are used in the automotive, motorcycle, bicycle, industrial machinery, and speed reducer industries, among others. However, the transmissions used in these numerous fields suffer from drawbacks such as high manufacturing and maintenance costs, complex structures, and low transmission efficiency. For example, in the automotive sector, the E-CVT electronic automatic transmission, featuring a double-cone and high-toughness steel belt structure, allows for continuous ratio changes, resulting in smooth transmission and excellent fuel economy. However, its drawbacks include limited torque capacity, complex structure, and high manufacturing costs. The DCT dual-clutch transmission suffers from low comfort, a high failure rate, and relatively high repair costs. The AT hydraulic automatic transmission suffers from low transmission efficiency, complex structure, and high price. In the bicycle industry, transmissions generally lack stepless transmission, resulting in noticeable jerking during shifting, and shifting is only possible by rotating the center shaft, making it very inconvenient. In the motorcycle industry, the automatic continuously variable transmission (CVT) used in the automotive industry suffers from poor shifting performance and stability, resulting in undesirable effects such as jitter, slipping, and noise during use. In the field of industrial robot and intelligent robot manufacturing, reducers are a core component of robot motion. Small mobile robots, in particular, have higher requirements for speed, efficiency, and load capacity. Continuously variable transmissions have the advantage of being able to continuously change the transmission ratio, which can effectively solve the adaptability problem of small mobile robots in complex road conditions. However, small mobile robots limit the size and weight of continuously variable transmissions, making most existing continuously variable transmissions unable to be directly applied to them. In the field of reducer manufacturing, the commonly used flexible wheels of harmonic reducers are prone to fatigue damage, have large moments 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 difficult to disassemble and assemble, and have high maintenance costs. Summary of the Invention

[0005] The purpose of the present invention 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, and wide application range.

[0006] The present invention provides a continuously variable transmission, comprising 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 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.

[0007] The continuously variable transmission provided by the present invention comprises a first blade of a first wheel assembly and a second blade of a second wheel assembly coaxially arranged and interlocked with each other. 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 begin to rotate. The first blade and the second blade are driven and engaged at different radial positions, which changes the ratio of the power input lever arm to 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 ultimately changing the output speed of the continuously variable transmission. Moreover, because the change in the engagement position of the first blade and the second blade is a continuous process, the change in the output speed of the continuously variable transmission provided by the present invention is also continuous, without causing a noticeable sense of jerk. In addition, the continuously variable transmission provided by the present invention has the advantages of a compact structure, low manufacturing and maintenance costs, adaptability to different installation space requirements, and the ability to meet the production and installation requirements of different manufacturing fields, thus having a wide range of applications.

[0008] Optionally, the first wheel assembly has a plurality of first blades evenly arranged along the rotation plane of the first wheel assembly, the second wheel assembly has a plurality of second blades evenly arranged along the rotation plane of the first wheel assembly, and the number of the first blades is the same as the number of the second blades.

[0009] 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.

[0010] Optionally, the continuously variable transmission provided by the present invention 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.

[0011] Optionally, the continuously variable transmission provided by the present invention further includes a first gear provided on the screw rod and used for driving the screw rod to rotate.

[0012] Optionally, the first wheel assembly includes a first ring detachably provided on an end portion of the first blade away from the screw rod.

[0013] Optionally, the second wheel assembly includes a second ring detachably provided on the end of the second blade close to the screw rod, and a gap is formed between the second ring and the outer sleeve.

[0014] Optionally, the continuously variable transmission provided by the present invention 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 sliding cooperation, 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.

[0015] Optionally, the first blade and the second blade are fan-shaped, and the arcuate side of the fan-shaped blade is provided at the end of the first blade and the second blade away from the screw rod.

[0016] Optionally, the first blade and / or the second blade are arranged to be inclined relative to the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of an embodiment of a continuously variable transmission provided by the present invention;

[0018] FIG2 is a perspective schematic diagram of an embodiment of a continuously variable transmission provided by the present invention;

[0019] FIG. 3 is an exploded view of the continuously variable transmission of FIG. 2 . DETAILED DESCRIPTION

[0020] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0021] In the present invention, 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 invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0022] Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0023] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] The continuously variable transmission disclosed in accordance with the present invention will be described below with reference to the accompanying drawings.

[0025] As shown in FIG1 , the continuously variable transmission provided by the present invention includes a first wheel assembly A having a first blade and a second wheel assembly B having a second blade. The first blade and the second blade are coaxially arranged and interlocked. When the first blade and the second blade are interlocked and engaged, the positions at which the first blade and the second blade engage are alternately distributed along a rotational plane. Furthermore, at least one of the first wheel assembly A and the second wheel assembly B is adjustable for axial movement relative to the other. Specifically, 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. During this axial movement, the transmission engagement position of the first blade and the second blade moves radially. When the first blade or the second blade is connected to the power input end, the first blade and the second blade begin to rotate. Therefore, during this continuous change in the transmission engagement position, the ratio of the power input lever arm to the power output lever arm of the first wheel assembly A and the second wheel assembly B changes, thereby varying the torque output by the continuously variable transmission and ultimately varying the output speed of the continuously variable transmission. Furthermore, because the engagement position of the first and second blades changes continuously, the output speed of the continuously variable transmission provided by the present invention also changes continuously, without causing noticeable jerks, thereby achieving continuously variable speed change. Furthermore, the continuously variable transmission provided by the present invention has the advantages of a compact structure, low manufacturing and maintenance costs, and adaptability to different installation space requirements, thereby meeting the production and installation requirements of various manufacturing fields, thus having 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 present invention, the first wheel assembly A has a plurality of first blades evenly arranged along the rotation plane of the first wheel assembly A, and the second wheel assembly B has a plurality of second blades evenly arranged along the rotation plane of the second 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, equivalent to every two first blades sandwiching one second blade; or the number of the second blades is twice the number of the first blades. In this case, the first blades are arranged at intervals in the gaps formed by the second blades, equivalent to every two second blades sandwiching 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 is driven to move axially relative to the second wheel assembly B by moving the shift lever, or the second wheel assembly B is 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] Alternatively, preferably, as shown in FIG1 , the continuously variable transmission provided by the present invention further includes a screw 1, first bearings 2 disposed at both ends of the screw 1 for supporting the screw 1, an inner sleeve 12 threadedly connected to at least a portion of the screw 1, and an outer sleeve 13 sleeved outside the inner sleeve 12, wherein a third bearing 9 is disposed within the annular space formed between the inner sleeve 12 and the outer sleeve 13, and a first blade is connected to an end of the outer sleeve 13 proximal to the second wheel assembly B. Continuing with FIG1 , at least a portion 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 travel stroke of the first wheel assembly A. Furthermore, a plurality of third bearings 9 may be disposed within the annular space formed between the inner sleeve 12 and the outer sleeve 13, with the plurality of third bearings 9 being 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, thereby causing the inner sleeve 12 to move axially, and driving the outer sleeve 13 and the first wheel assembly A to move axially.

[0031] Alternatively, according to a preferred embodiment of the continuously variable transmission of the present invention, as shown in FIG1 , the continuously variable transmission further includes a first gear 3 disposed on the screw 1 for driving the screw 1 to rotate. For example, the first gear 3 is connected to an external drive gear, which drives the first gear 3 to rotate, thereby driving the screw 1 to rotate. As shown in FIG1 , the first gear 3 can be mounted on the inner side of the first bearing 2 at the end of the screw 1, that is, on the side of the first bearing 2 near the first wheel assembly A.

[0032] As shown in Figure 1, according to a preferred embodiment of the continuously variable transmission of the present invention, 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 sliding fit, 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.

[0033] Specifically, at least a portion of the outer peripheral wall of the outer sleeve 13 is formed with a protruding key strip, the axial length of which is greater than or equal to the travel distance of the first wheel assembly A. A corresponding groove is formed on the inner surface of the gear mounting hole of the third gear 11. The key strip and the groove allow the third gear 11 to rotate with the outer sleeve 13, while also allowing the outer sleeve 13 to slide axially relative to the third gear 11. As shown in FIG1 , the first gear 3 is externally connected to a drive gear. The drive gear rotates the first gear 3, which in turn drives the lead screw 1, causing the inner sleeve 12, outer sleeve 13, and first wheel assembly A to move axially. At this time, the outer sleeve 13 moves axially relative to the third gear 11. Simultaneously, the second gear 4, serving as the power input of the continuously variable transmission, drives the second wheel assembly B to rotate, driving the first wheel assembly A and the outer sleeve 13 to rotate, which in turn drives the third gear 11 to rotate, completing the power transmission from the second gear 4 to the third gear 11. Furthermore, as shown in FIG1 , the first gear 3 can be mounted on the lead screw 1 between the first bearing 2 and the second bearing 5. Of course, the first gear 3 can be arranged 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] 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 moving axially relative to the second wheel assembly B, the working principle of the continuously variable transmission provided by the present invention is further explained. As shown in Figure 1, when the second gear 4 drives the second wheel assembly B to rotate, the rotational force applied by the second gear 4 to the second wheel assembly B is FB, and 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 applied to the first wheel assembly A is FA, and FA is equal to FB. As the first wheel assembly A moves axially from right to left relative to the second wheel assembly B in FIG1 , the vertical distance LA between the meshing position on the first wheel assembly A and the outer sleeve 13 gradually decreases. This vertical distance LA is the turning force arm of the first wheel assembly A. The turning torque transmitted by the second wheel assembly B to the first wheel assembly A is FA × LA. Therefore, as the first wheel assembly A moves axially from right to left relative to the second wheel assembly B in FIG1 (i.e., from the position indicated by the right dashed line in FIG1 to the position indicated by the left dashed line in FIG1 ), the turning torque transmitted by the second wheel assembly B to the first wheel assembly A gradually decreases. According to the principle of leverage, the turning torque of the first wheel assembly A is equal to the turning torque of the outer sleeve 13, and the turning torque of the outer sleeve 13 is equal to the turning torque of the third gear 11. Therefore, as the first wheel assembly A moves axially from left to right relative to the second wheel assembly B in FIG1 , the torque output by the third gear 11 gradually increases. Therefore, the continuously variable transmission provided by the present invention changes the engagement 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 ultimately changing the output speed of the continuously variable transmission.

[0035] The above describes in detail an embodiment 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 embodiment of the continuously variable transmission of the present invention, the second wheel assembly B may be axially moved 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 to the screw thread 10. An outer sleeve is sleeved on the outer side of the second gear 4, and the inner wall of the outer sleeve is formed with a groove that matches the teeth of the second gear 4. One end of the outer sleeve is formed with an end face having 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 described in detail here.

[0036] In addition, as mentioned above, the first blade is connected to the outer sleeve 13. During the rotation process, the lever arm LA of the first blade 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 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 LA of the first blade becomes the vertical distance from the meshing position of the first wheel assembly A and the second wheel assembly B to the inner sleeve 12, which is approximately the vertical distance from the meshing position of the first wheel assembly A and the second wheel assembly B to the screw 1. Therefore, this transmission mode is called the "center axis transmission" mode. Specifically, as shown in Figure 1, one end of the first blade is connected to the end of the inner sleeve 12 near the second gear 4, and the first blade remains non-contacting with the outer sleeve 13. There are various 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 near the second gear 4 protrudes relative to the outer sleeve 13. The first blade extends in the direction toward the screw rod 1 and is connected to the end of the inner sleeve 12 near 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 a 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 threads on the screw 1 are adjusted to key grooves corresponding to the key strips on the inner wall of the inner sleeve 12. Through the above adjustment, when the third gear 11 rotates, it drives the outer sleeve 13 to rotate and move axially. Since the inner sleeve 12 and the screw 1 slide together, when the third gear 11 rotates, the outer sleeve 13, the inner sleeve 12 and the first wheel assembly A all move axially along the extension direction of the screw 1, thereby changing the meshing position of the first blade and the second blade, and then changing the magnitude of the lever arm when the first blade rotates, ultimately 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 lever arm of the first blade in the central shaft transmission mode is greater than the lever 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 to control 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] 1 , the first wheel assembly A may include a first ring 8 detachably mounted on the end of the first blade away from the screw 1 , thereby enhancing the structural strength of the first wheel assembly A. Furthermore, the second wheel assembly B may include a second ring 7 detachably mounted on the end of the second blade near the screw 1 , with a gap formed between the second ring 7 and the outer sleeve 13 to prevent interference between the second blade and the outer sleeve 13 during rotation.

[0039] In addition, the shape of the first blade and the second blade can be a long strip, an inverted triangle, etc., preferably a fan-shaped, and the arc side of the fan-shaped is provided at the end 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 in the actual application working conditions.

[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. With reference to Figure 1, according to a preferred embodiment of the present invention, the second blade further 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.

[0041] In addition, the first blade can be set perpendicular to the central axis of the screw rod 1, or it can be set 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 it can be set 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 have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention may be subjected to various simple modifications, including combining the specific technical features in any suitable manner. 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 disclosed in the present invention and fall within the scope of protection 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: The continuously variable transmission further comprises a screw (1), first bearings (2) arranged at both ends of the screw (1) and used to support the screw (1), an inner sleeve (12) threadedly connected to at least a portion of the screw (1), and an outer sleeve (13) sleeved outside the inner sleeve (12), wherein a third bearing (9) is arranged 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: The continuously variable transmission 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: The continuously variable transmission also includes a second gear (4) and a third gear (11), wherein the second gear (4) is supported on the screw (1) via a second bearing (5), the third gear (11) is circumferentially transmission-engaged with the outer sleeve (13) 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.

7. The continuously variable transmission according to claim 1, characterized in that: The continuously variable transmission further comprises a screw (1), a first bearing (2), an inner sleeve (12), an outer sleeve (13) and a third gear (11), wherein the first bearing (2) is arranged at both ends of the screw (1) and is used to support the screw (1), the inner sleeve (12) is in circumferential transmission engagement with at least a portion of the screw (1) and is axially slidably matched, the outer sleeve (13) is sleeved outside the inner sleeve (12), and the third gear (11) is 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 an 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; The continuously variable transmission further comprises a second gear (4) supported on the screw (1) via a second bearing (5) and a first gear (3) arranged on the screw (1), wherein the second gear (4) is arranged as a power input end of the continuously variable transmission and the first gear (3) is arranged as a power output end of the continuously variable transmission, or the first gear (3) is arranged as a power input end of the continuously variable transmission and the second gear (4) is arranged as a 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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