Continuously variable transmission

Abstract

The invention relates to the technical field of transmissions, and discloses a continuously variable transmission which comprises a first transmission unit and a second transmission unit which are coaxially arranged, the first transmission unit comprises a first transmission arm, the second transmission unit comprises a second transmission arm, and the first transmission arm and the second transmission arm are arranged in a mutually nested mode; the rolling body can abut against the first transmission arm and the second transmission arm. And the variable-diameter control unit is configured to be capable of driving the rolling body to move to different radial positions, so that the first transmission arm and the second transmission arm are in transmission joint through the rolling body at the different radial positions. According to the continuously variable transmission, the rolling body is driven to move to different radial positions, so that the first transmission arm and the second transmission arm are in transmission combination at different radial positions, the output speed of the continuously variable transmission is changed, and continuously variable transmission is achieved. And meanwhile, the first transmission arm and the second transmission arm are jointed through the rolling body, so that the service life of the continuously variable transmission is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and particularly to a continuously variable transmission (CVT). Background Art

[0002] Transmissions are required in the fields of automobile manufacturing, motorcycle manufacturing, bicycle manufacturing, industrial machinery manufacturing, speed reducer manufacturing, etc. However, the transmissions used in the above-mentioned numerous fields have defects such as high manufacturing cost, high maintenance cost, complex structure, or low transmission efficiency. For example, in the field of automobile manufacturing, the E-CVT electronic automatic transmission has a double-cone and high-toughness steel belt structure, can continuously change the transmission ratio, has good transmission smoothness and good fuel economy, but has the disadvantages of limited torque capacity, complex structure, and relatively high manufacturing cost; the DCT dual-clutch transmission has low comfort and high failure rate, and the maintenance cost is also relatively high; the 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 there is an obvious sense of jerk when shifting gears, and it can only be shifted when pedaling the center shaft to rotate, which is very inconvenient to use. In the field of motorcycle manufacturing, the automatic centrifugal continuously variable transmission used has weak speed-changing ability and weak stability, and there will be adverse reactions such as jitter, slipping, and abnormal noise during use. In the field of industrial robot and intelligent robot manufacturing, the speed reducer is the core component of the robot's movement. Small mobile robots have higher requirements for speed, efficiency, and load capacity in particular. The continuously variable transmission has the advantage of continuously changing the transmission ratio, which can effectively solve the adaptability problem of small mobile robots in complex road conditions. However, the size and weight of small mobile robots limit the continuously variable transmission, making most of the existing continuously variable transmissions unable to be directly applied to them. In the field of speed reducer manufacturing, the flexible wheel of the commonly used harmonic speed reducer is prone to fatigue damage, has a large moment of inertia and starting torque, and is difficult to machine and manufacture, and the process flow is complex; the RV speed reducer is greatly affected by the process and assembly, has high requirements for the wear resistance and high rigidity of the gears, and requires special component processing and precision assembly technology; the planetary speed reducer and the cycloidal pinwheel speed reducer cannot bear large loads, are relatively troublesome to disassemble and assemble, and have a high maintenance cost. Summary of the Invention

[0003] The object of the present invention is to overcome at least one of the above technical problems existing in the existing transmissions, and provide a continuously variable transmission, which has the characteristics of simple structure, small volume, long service life, stable and reliable power transmission, and wide application range.

[0004] To achieve the above object, the present invention provides a continuously variable transmission, comprising: a first transmission unit and a second transmission unit arranged coaxially, the first transmission unit includes a first transmission arm, the second transmission unit includes a second transmission arm, and the first transmission arm and the second transmission arm are nested with each other; rolling elements, the rolling elements can respectively abut between the first transmission arm and the second transmission arm; and a variable diameter control unit, the variable diameter control unit is configured to be able to drive the rolling elements to move to different radial positions so that the first transmission arm and the second transmission arm are in transmission engagement through the rolling elements at different radial positions.

[0005] In the continuously variable transmission provided by the present invention, the first transmission arm of the first transmission unit and the second transmission arm of the second transmission unit are in transmission engagement through the rolling elements, and the variable diameter control unit can control the rolling elements to move to different radial positions, so that the transmission engagement position between the first transmission arm and the second transmission arm changes. When the first transmission unit or the second transmission unit starts to rotate under the driving force, the first transmission arm and the second transmission arm rotate together. Therefore, the transmission combination position between the first transmission arm and the second transmission arm changes, and further, the ratio of the power input arm to the power output arm between the first transmission arm and the second transmission arm changes, so that the torque output by the continuously variable transmission changes, and finally the output speed of the continuously variable transmission changes. Moreover, since the process of driving the rolling elements to move to different radial positions by the variable diameter control unit is a continuously changing process, the change of the output speed of the continuously variable transmission provided by the present invention is also continuous and there will be no obvious sense of jerk. In addition, the continuously variable transmission provided by the present invention also has the advantages of simple structure, low manufacturing and maintenance costs, being able to adapt to different installation space requirements to meet the production installation requirements of different manufacturing fields, and having a wide range of applications.

[0006] In addition, compared with the direct frictional contact between the first transmission arm and the second transmission arm, the first transmission arm of the first transmission unit and the second transmission arm of the second transmission unit are in transmission engagement through the rolling elements, and the rolling friction exists between the rolling elements and both the first transmission arm and the second transmission arm, which can reduce the friction between the rolling elements and the first transmission arm and the second transmission arm, thereby prolonging the service life of the first transmission arm and the second transmission arm, and further prolonging the service life of the continuously variable transmission. At the same time, the first transmission arm of the first transmission unit and the second transmission arm of the second transmission unit are in transmission engagement through the rolling elements, which is also beneficial to reducing the working noise during the operation of the continuously variable transmission.

[0007] In some embodiments, one of the first transmission unit and the second transmission unit is in transmission connection with the power input end of the continuously variable transmission, and the other is in transmission connection with the power output end of the continuously variable transmission.

[0008] In some embodiments, the first transmission unit includes a plurality of first transmission arms uniformly arranged along the rotation surface of the first transmission unit, the second transmission unit includes a plurality of second transmission arms uniformly arranged along the rotation surface of the second transmission unit, and the number of the first transmission arms is the same as the number of the second transmission arms.

[0009] In some embodiments, the rolling elements include balls. A first chute is formed on the side surface of the first transmission arm facing the second transmission arm, and a second chute is formed on the side surface of the second transmission arm facing the first transmission arm. The balls are respectively in rolling connection with the first chute and the second chute.

[0010] In some embodiments, the first transmission arm and the second transmission arm are arranged in a mutually cross-nested manner. The variable diameter control unit is configured to be able to drive at least one of the first transmission unit and the second transmission unit to axially move relative to the other, so that the first transmission arm and the second transmission arm are in transmission engagement at different radial positions through the rolling elements.

[0011] In some embodiments, the variable diameter control unit includes a threaded control rod, a variable diameter control gear in transmission connection with the threaded control rod, and an axial movement assembly threadedly connected to the threaded control rod. The axial movement assembly is connected to the first transmission arm.

[0012] In some embodiments, the axial movement assembly includes a first bearing threadedly connected to the threaded control rod and an outer shaft sleeve sleeved outside the first bearing. The outer shaft sleeve is connected to the first transmission arm.

[0013] In some embodiments, the variable diameter control unit includes a variable diameter control gear, a threaded outer shaft sleeve threadedly connected to the variable diameter control gear, an inner shaft sleeve sleeved inside the threaded outer shaft sleeve, and a second bearing supported between the threaded outer shaft sleeve and the inner shaft sleeve. The continuously variable transmission further includes a center rod capable of axially slidingly cooperating with the inner peripheral wall of the inner shaft sleeve. The first transmission unit is sleeved on one end of the inner shaft sleeve extending out of the threaded outer shaft sleeve.

[0014] In some embodiments, the first transmission unit further includes a first ring connected to at least one end of the first transmission arm; and / or the second transmission unit further includes a second ring connected to at least one end of the second transmission arm.

[0015] In some embodiments, the first transmission arm and the second transmission arm are nested parallel to each other, and the diameter-changing control unit is configured to drive the rolling body to move to different radial positions along the extending direction of the center line of the first transmission arm or the second transmission arm, so that the first transmission arm and the second transmission arm are in transmission engagement at different radial positions through the rolling body.

[0016] In some embodiments, the diameter-changing control unit includes a threaded control rod, a diameter-changing control gear drivingly connected to the threaded control rod, an axially moving assembly threadedly connected to the threaded control rod, and a connecting assembly. One end of the connecting assembly is pivotally connected to the outer wall of the axially moving assembly, and the other end is connected to the rolling body. The non-threaded portion of the threaded control rod can be rotationally connected to the first transmission unit.

[0017] In some embodiments, the axially moving assembly includes a third bearing threadedly connected to the threaded control rod, and the connecting assembly is pivotally connected to the outer wall of the third bearing.

[0018] In some embodiments, the diameter-changing control unit includes a threaded outer sleeve, a diameter-changing control gear drivingly connected to the threaded outer sleeve, an axially moving assembly threadedly connected to the threaded outer sleeve, and a connecting assembly. One end of the connecting assembly is pivotally connected to the outer wall of the axially moving assembly, and the other end is connected to the rolling body. The first transmission unit includes a center rod connected to the first transmission arm, and the center rod can rotatably pass through the threaded outer sleeve.

[0019] In some embodiments, the axially moving assembly includes a fourth bearing threadedly connected to the threaded outer sleeve, and the connecting assembly is pivotally connected to the outer wall of the fourth bearing.

[0020] In some embodiments, the second transmission unit further includes a second ring connected to at least one end of the second transmission arm.

[0021] In some embodiments, the diameter-changing control unit includes a threaded control rod, a diameter-changing control gear drivingly connected to the threaded control rod, an axially moving assembly threadedly connected to the threaded control rod, and a diameter-changing control frame. One end of the diameter-changing control frame is connected to the outer wall of the axially moving assembly. The diameter-changing control frame can pass through the gap between the first transmission arm and the second transmission arm. The rolling body is embedded in the diameter-changing control frame and can move along the extending direction of the diameter-changing control frame. The non-threaded portion of the threaded control rod can be rotationally connected to the first transmission unit.

[0022] In some embodiments, the axial movement assembly includes a fifth bearing that can be threadedly connected to the threaded control rod, and the variable diameter control frame is connected to the outer wall of the fifth bearing.

[0023] In some embodiments, the first transmission unit further includes a first ring connected to at least one end of the first transmission arm; and / or the second transmission unit further includes a second ring connected to at least one end of the second transmission arm; and / or the continuously variable transmission further includes a third ring connected to the end of the variable diameter control frame away from the axial movement assembly.

[0024] In some embodiments, the variable diameter control unit includes a variable diameter control disk, a variable diameter control gear that can be drivingly connected to the variable diameter control disk, and a connection assembly respectively connected to the variable diameter control disk and the rolling elements. The variable diameter control disk is disposed on the side of the first transmission unit away from the second transmission unit and / or on the side of the second transmission unit away from the first transmission unit. The variable diameter control disk includes a hollow first disk body, a second disk body, and a connecting member connecting between the first disk body and the second disk body. Teeth that can be meshingly connected to the variable diameter control gear are formed on the outer edge of the second disk body. A hollow connection groove is formed in the connecting member. The center line of the connection groove is inclined with respect to the center lines of the first transmission arm and the second transmission arm. One end of the connection assembly can be slidably connected in the connection groove. The continuously variable transmission further includes a center rod respectively rotationally connected to the first disk body and the first transmission unit.

[0025] In some embodiments, the center line of the connection groove forms an involute of the first disk body.

[0026] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description section. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective structural view of the first embodiment of the continuously variable transmission provided by the present invention;

[0028] Figure 2 is Figure 1 the exploded view of the continuously variable transmission in

[0029] Figure 3 is a perspective structural view of the second embodiment of the continuously variable transmission provided by the present invention;

[0030] Figure 4 is Figure 3 the exploded view of the continuously variable transmission in

[0031] Figure 5It is a schematic perspective structure diagram of the first view of the third embodiment of the continuously variable transmission provided by the present invention;

[0032] Figure 6 It is a schematic perspective structure diagram of the second view of the third embodiment of the continuously variable transmission provided by the present invention;

[0033] Figure 7 Is Figure 5 And Figure 6 The exploded view of the continuously variable transmission in;

[0034] Figure 8 It is a schematic perspective structure diagram of the first view of the fourth embodiment of the continuously variable transmission provided by the present invention;

[0035] Figure 9 It is a schematic perspective structure diagram of the second view of the fourth embodiment of the continuously variable transmission provided by the present invention;

[0036] Figure 10 Is Figure 8 And Figure 9 The exploded view of the continuously variable transmission in;

[0037] Figure 11 It is a schematic perspective structure diagram of the first view of the fifth embodiment of the continuously variable transmission provided by the present invention;

[0038] Figure 12 It is a schematic perspective structure diagram of the second view of the fifth embodiment of the continuously variable transmission provided by the present invention;

[0039] Figure 13 Is Figure 11 And Figure 12 The exploded view of the first view of the continuously variable transmission in;

[0040] Figure 14 Is Figure 11 And Figure 12 The exploded view of the second view of the continuously variable transmission in;

[0041] Figure 15 It is a schematic perspective structure diagram of the first view of the sixth embodiment of the continuously variable transmission provided by the present invention;

[0042] Figure 16 It is a schematic perspective structure diagram of the second view of the sixth embodiment of the continuously variable transmission provided by the present invention;

[0043] Figure 17 Is Figure 15 And Figure 16 The exploded view of the continuously variable transmission in.

[0044] Explanation of reference numerals

[0045] 10 - First drive unit; 101 - First drive arm; 1011 - First chute; 102 - First ring; 103 - Central rod; 104 - Second support bearing; 105 - Outer shaft sleeve of drive arm; 20 - Second drive unit; 201 - Second drive arm; 2011 - Second chute; 202 - Second ring; 203 - Drive arm disc; 204 - Third support bearing; 30 - Ball; 401 - Variable diameter control gear; 402 - Outer shaft sleeve; 403 - Thread control rod; 404 - First bearing; 405 - Threaded outer shaft sleeve; 406 - Inner shaft sleeve; 407 - Second bearing; 408 - Third bearing; 409 - Control rod; 410 - Cage; 411 - Fourth bearing; 412 - Fifth bearing; 413 - Variable diameter control frame; 414 - Third ring; 415 - Variable diameter control disc; 4151 - First disc body; 4152 - Second disc body; 4153 - Connecting piece; 4154 - Fourth support bearing; 50 - First gear; 501 - First support bearing; 60 - Second gear; 70 - First load-bearing bearing; 80 - Second load-bearing bearing. Detailed implementation manners

[0046] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0047] In the present invention, unless otherwise stated, the orientation or positional relationship indicated by terms such as "upper, lower, left, right, inner, outer, top, bottom" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0048] In addition, terms such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In the present invention, descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0050] In the present invention, unless otherwise clearly specified and defined, terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] The present invention provides a continuously variable transmission, referring to Figures 1 to 17 as shown, the continuously variable transmission includes: a first transmission unit 10 and a second transmission unit 20 arranged coaxially. The first transmission unit 10 includes a first transmission arm 101, and the second transmission unit 20 includes a second transmission arm 201. The first transmission arm 101 and the second transmission arm 201 are nested with each other; rolling elements that can respectively abut against the first transmission arm 101 and the second transmission arm 201; and a variable diameter control unit configured to be able to drive the rolling elements to move to different radial positions so that the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged through the rolling elements at different radial positions.

[0052] The continuously variable transmission provided by the present invention has the first transmission arm 101 of the first transmission unit 10 and the second transmission arm 201 of the second transmission unit 20 in transmission engagement through rolling elements. The variable diameter control unit can control the rolling elements to move to different radial positions, so that the transmission engagement position between the first transmission arm 101 and the second transmission arm 201 changes. When the first transmission unit 10 or the second transmission unit 20 starts to rotate under the driving force, the first transmission arm 101 and the second transmission arm 201 rotate accordingly. Therefore, the transmission engagement position between the first transmission arm 101 and the second transmission arm 201 changes, and further the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201 changes, so that the torque output by the continuously variable transmission changes, and finally the output speed of the continuously variable transmission changes. Moreover, since the process of the variable diameter control unit driving the rolling elements to move to different radial positions is a continuously changing process, the change of the output speed of the continuously variable transmission provided by the present invention is also continuous, without obvious jerks. In addition, the continuously variable transmission provided by the present invention also has the advantages of simple structure, low manufacturing and maintenance costs, being able to adapt to different installation space requirements to meet the production installation requirements of different manufacturing fields, and having a wide range of applications.

[0053] In addition, compared with the direct frictional contact between the first transmission arm 101 and the second transmission arm 201, the first transmission arm 101 of the first transmission unit 10 and the second transmission arm 201 of the second transmission unit 20 are in transmission engagement through rolling elements. The rolling elements are in rolling friction with both the first transmission arm 101 and the second transmission arm 201, which can reduce the friction force between the rolling elements and the first transmission arm 101 and the second transmission arm 201, thereby prolonging the service life of the first transmission arm 101 and the second transmission arm 201, and further prolonging the service life of the continuously variable transmission. At the same time, the first transmission arm 101 of the first transmission unit 10 and the second transmission arm 201 of the second transmission unit 20 are in transmission engagement through rolling elements, which is also beneficial to reducing the working noise during the operation of the continuously variable transmission.

[0054] In some embodiments, one of the first transmission unit 10 and the second transmission unit 20 is in transmission connection with the power input end of the continuously variable transmission, and the other is in transmission connection with the power output end of the continuously variable transmission. For example, as shown in Figures 1 to 17 Figure, the first transmission unit 10 is in transmission connection with the second gear 60, and the second transmission unit 20 is in transmission connection with the first gear 50. One of the first gear 50 and the second gear 60 can be used as the power input end of the continuously variable transmission, and the other as the power output end of the continuously variable transmission.

[0055] In some embodiments, the first transmission unit 10 includes a plurality of first transmission arms 101 uniformly arranged along the rotation surface of the first transmission unit 10, the second transmission unit 20 includes a plurality of second transmission arms 201 uniformly arranged along the rotation surface of the second transmission unit 20, and the number of the first transmission arms 101 is the same as that of the second transmission arms 201.

[0056] In some embodiments, the rolling elements include balls 30. A first sliding groove 1011 is formed on the side surface of the first transmission arm 101 facing the second transmission arm 201, and a second sliding groove 2011 is formed on the side surface of the second transmission arm 201 facing the first transmission arm 101. The balls 30 are respectively in rolling connection with the first sliding groove 1011 and the second sliding groove 2011. Of course, the rolling elements in the present invention may also include, but are not limited to, cylinders, bearings, etc.

[0057] In some embodiments, referring to Figures 1 to 4 As shown, the first transmission arm 101 and the second transmission arm 201 are arranged in a mutually intersecting and nested manner, that is, the first transmission arm 101 and the second transmission arm 201 extend in a relatively inclined direction. For example, the first transmission arm 101 and the second transmission arm 201 extend in opposite directions, so that the first transmission arm 101 and the second transmission arm 201 are in a crossed shape. The diameter-changing control unit is configured to be able to drive at least one of the first transmission unit 10 and the second transmission unit 20 to axially move relative to the other, so that the first transmission arm 101 and the second transmission arm 201 are in transmission engagement at different radial positions through the rolling elements. In this way, the diameter-changing control unit directly drives at least one of the first transmission unit 10 and the second transmission unit 20 to axially move relative to the other, so that the first transmission arm 101 and the second transmission arm 201 are in transmission engagement at different radial positions through the rolling elements, so as to change the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201, so that the torque output by the continuously variable transmission changes, and finally the output speed of the continuously variable transmission changes.

[0058] Or in some other embodiments, referring to Figures 5 to 17As shown, the first transmission arm 101 and the second transmission arm 201 are nested parallel to each other, that is, the first transmission arm 101 and the second transmission arm 201 extend in substantially the same direction, so that the first transmission arm 101 and the second transmission arm 201 are arranged relatively parallel. The diameter-changing control unit is configured to be able to drive the rolling element to move along the extension direction of the center line of the first transmission arm 101 or the second transmission arm 201 to different radial positions, so that the first transmission arm 101 and the second transmission arm 201 are in transmission engagement through the rolling element at different radial positions. In this way, the diameter-changing control unit directly drives the rolling element to move, so that the rolling element moves to different radial positions, so that the first transmission arm 101 and the second transmission arm 201 are in transmission engagement through the rolling element at different radial positions, so as to change the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201, so that the torque output by the continuously variable transmission changes, and finally the output speed of the continuously variable transmission changes.

[0059] Embodiment 1

[0060] This embodiment is used to illustrate the first implementation manner of the continuously variable transmission provided by the present invention.

[0061] Referring to Figure 1 and Figure 2 As shown, the continuously variable transmission provided by the present invention includes a first transmission unit 10 and a second transmission unit 20. The first transmission unit 10 and the second transmission unit 20 are arranged relative to the same central axis. The first transmission unit 10 includes a plurality of first transmission arms 101 uniformly arranged along the rotation surface of the first transmission unit 10. The first transmission arms 101 are inclined relative to the above central axis. The second transmission unit 20 includes a plurality of second transmission arms 201 uniformly arranged along the rotation surface of the second transmission unit 20. The second transmission arms 201 are inclined relative to the above central axis. The inclination directions of the first transmission arms 101 and the second transmission arms 201 are opposite. The second transmission arms 201 are hollow. The first transmission arms 101 can be nested and passed through the second transmission arms 201. As Figure 1 shown, so that the first transmission arm 101 and the second transmission arm 201 are in a crossed shape. Of course, it is also possible that the first transmission arm 101 is hollow and the second transmission arm 201 can be nested and passed through the first transmission arm 101, which will not be elaborated here. A first chute 1011 is provided on the side surface of the first transmission arm 101 facing the second transmission arm 201, and a second chute 2011 is provided on the side surface of the second transmission arm 201 facing the first transmission arm 101. The continuously variable transmission provided by the present invention further includes a rolling element, such as a ball 30. The ball 30 can be arranged between the first transmission arm 101 and the second transmission arm 201. For example, the ball 30 can be respectively arranged in the first chute 1011 and the second chute 2011, that is, the first transmission arm 101 and the second transmission arm 201 are in transmission engagement through the ball 30.

[0062] Furthermore, the continuously variable transmission of the present invention further includes a variable diameter control unit, which drives at least one of the first transmission unit 10 and the second transmission unit 20 to axially move relative to the other, so that the first transmission arm 101 and the second transmission arm 20 are in transmission engagement at different radial positions through rolling elements. Specifically, referring to Figure 1 and Figure 2 As shown, the variable diameter control unit includes a threaded control rod 403, a variable diameter control gear 401 drivingly connected to the threaded control rod 403, a first bearing 404 threadedly connected to the threaded control rod 403, and an outer shaft sleeve 402 sleeved outside the first bearing 404. The outer shaft sleeve 402 is connected to the first transmission arm 101, and an axial keyway or key is provided on the outer peripheral wall of the outer shaft sleeve 402.

[0063] Furthermore, as Figure 1 and Figure 2 shown, the first transmission unit 10 further includes a first ring 102, the first ring 102 is arranged at one end of the first transmission arm 101 away from the threaded control rod 403, the second transmission unit 20 further includes a second ring 202, and the second ring 202 is arranged at one end of the second transmission arm 201 away from the threaded control rod 403.

[0064] The continuously variable transmission of the present invention further includes a first gear 50 and a second gear 60. One of the first gear 50 and the second gear 60 can be used as the power input end of the continuously variable transmission, and the other can be used as the power output end of the continuously variable transmission. The first gear 50 is drivingly connected to the second transmission unit 20. For example, the first gear 50 is drivingly connected to the second ring 202; the second gear 60 is drivingly connected to the first transmission unit 10. For example, an axial keyway or key is provided on the inner peripheral wall of the second gear 60 to cooperate with the keyway or key on the outer peripheral wall of the aforementioned outer shaft sleeve 402 to form a sliding driving connection.

[0065] The continuously variable transmission of the present invention further includes a first load-bearing bearing 70 and a second load-bearing bearing 80. Referring to Figure 1 and Figure 2 shown, the first load-bearing bearing 70 and the second load-bearing bearing 80 are respectively arranged at both ends of the threaded control rod 403 to improve the structural stability of the continuously variable transmission.

[0066] The working principle of the first embodiment of the continuously variable transmission of the present invention will be specifically described below.

[0067] Referring to Figure 1 and Figure 2As shown, the first gear 50 serves as the power input end of the continuously variable transmission, and the second gear 60 serves as the power output end of the continuously variable transmission. The first gear 50 is driven by a driving force to drive the second transmission unit 20 to drive the second transmission arm 201 to rotate. The second transmission arm 201 drives the first transmission arm 101 to rotate through the ball 30. The first transmission arm 101 drives the first gear 50 to rotate through the outer shaft sleeve 402, realizing power transmission. When it is necessary to change the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201, the variable-diameter control gear 401 is rotated, thereby driving the threaded control rod 403 to rotate. The first bearing 404 is threadedly connected to the threaded control rod 403. The rotation of the threaded control rod 403 drives the first bearing 404 to axially move. The axial movement of the first bearing 404 drives the outer shaft sleeve 402 to axially move, and further drives the first transmission arm 101 to axially move relative to the second transmission arm 201, causing the ball 30 to move to different radial positions. And the first transmission arm 101 and the second transmission arm 201 are in transmission engagement at different radial positions through the ball 30, and the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0068] Embodiment 2

[0069] This embodiment is used to illustrate the second implementation manner of the continuously variable transmission provided by the present invention.

[0070] Referring to Figure 3 and Figure 4 As shown, Embodiment 2 is basically the same as Embodiment 1, with one difference being that the second ring 202 is arranged at one end of the second transmission arm 201 close to the following threaded outer shaft sleeve 405, and there is a gap between it and the threaded outer shaft sleeve 405.

[0071] In addition, referring to Figure 3 and Figure 4 As shown, the variable-diameter control unit includes a variable-diameter control gear 401, a threaded outer shaft sleeve 405 threadedly connected to the variable-diameter control gear 401, an inner shaft sleeve 406 sleeved inside the threaded outer shaft sleeve 405, and a second bearing 407 supported between the threaded outer shaft sleeve 405 and the inner shaft sleeve 406. The continuously variable transmission of the present invention further includes a center rod 103 that can be slidably fitted with the inner peripheral wall of the inner shaft sleeve 406. For example, keys or key grooves are provided on the outer peripheral wall of the center rod 103, and corresponding key grooves or keys are provided on the inner peripheral wall of the inner shaft sleeve 406. Thus, the inner shaft sleeve 406 and the center rod 103 can form an axially sliding connection. The first transmission unit 10 is sleeved on one end of the inner shaft sleeve 406 extending out of the threaded outer shaft sleeve 405. The first gear 50 is rotatably connected to the non-key or key groove part of the center rod 103 through the first support bearing 501.

[0072] The working principle of the second embodiment of the continuously variable transmission of the present invention will be specifically described below.

[0073] Refer to Figure 3 and Figure 4 As shown, the first gear 50 is used as the power input end of the continuously variable transmission, and the second gear 60 is used as the power output end of the continuously variable transmission. The first gear 50 is driven by a driving force to drive the second transmission unit 20 to drive the second transmission arm 201 to rotate. The second transmission arm 201 drives the first transmission arm 101 to rotate through the ball 30. The first transmission arm 101 drives the central rod 103 to rotate through the inner shaft sleeve 406, and then drives the first gear 50 to rotate to achieve power transmission. When it is necessary to change the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201, the variable diameter control gear 401 is rotated to drive the threaded outer shaft sleeve 405 to axially move, thereby driving the inner shaft sleeve 406 to axially move relative to the central rod 103, and then driving the first transmission arm 101 to axially move relative to the second transmission arm 201, so that the ball 30 moves to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are in transmission engagement at different radial positions, and the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0074] Embodiment 3

[0075] This embodiment is used to illustrate the third embodiment of the continuously variable transmission provided by the present invention.

[0076] Refer to Figures 5 to 7 As shown, the continuously variable transmission provided by the present invention includes a first transmission unit 10 and a second transmission unit 20. The first transmission unit 10 and the second transmission unit 20 are arranged relative to the same central axis. The first transmission unit 10 includes a plurality of first transmission arms 101 uniformly arranged along the rotation surface of the first transmission unit 10. The first transmission arms 101 are perpendicularly arranged relative to the above-mentioned central axis. The second transmission unit 20 includes a plurality of second transmission arms 201 uniformly arranged along the rotation surface of the second transmission unit 20. The second transmission arms 201 are perpendicularly arranged relative to the above-mentioned central axis. The second transmission arms 201 are hollow. The first transmission arms 101 can be nested into the second transmission arms 201, as Figure 5 and Figure 6As shown, the first drive arm 101 and the second drive arm 201 are arranged relatively parallel. Of course, it is also possible that the first drive arm 101 is hollow, and the second drive arm 201 can be nested into the first drive arm 101, which will not be elaborated here. A first chute 1011 is provided on the side of the first drive arm 101 facing the second drive arm 201, and a second chute 2011 is provided on the side of the second drive arm 201 facing the first drive arm 101. The continuously variable transmission provided by the present invention further includes a rolling element, such as a ball 30. The ball 30 can be arranged between the first drive arm 101 and the second drive arm 201. For example, the ball 30 can be respectively arranged in the first chute 1011 and the second chute 2011, that is, the first drive arm 101 and the second drive arm 201 are drivingly engaged through the ball 30.

[0077] Furthermore, the continuously variable transmission of the present invention further includes a variable diameter control unit. Through this variable diameter control unit, the ball 30 is driven to move to different radial positions along the first chute 1011 and the second chute 2011, so that the first drive arm 101 and the second drive arm 201 are drivingly engaged through the rolling element at different radial positions. Specifically, referring to Figures 5 to 7 As shown, the variable diameter control unit includes a threaded control rod 403, a variable diameter control gear 401 drivingly connected to the threaded control rod 403, a third bearing 408 threadedly connected to the threaded control rod 403, and a connection assembly pivotally connected to the outer wall of the third bearing 408. A rolling element, such as a ball 30, is connected to the connection assembly. The non-threaded part of the threaded control rod 403 can be rotatably connected to the first drive unit 10. Combining Figure 5 and Figure 7 As shown, the connection assembly includes a control rod 409 and a cage 410. One end of the control rod 409 is pivotally connected to the outer wall of the third bearing 408, and the other end is connected to the cage 410. The ball 30 is arranged in the cage 410.

[0078] Furthermore, as Figures 5 to 7 shown, the first drive unit 10 further includes an outer sleeve of the drive arm. The first drive arm 101 is drivingly connected to the outer wall of the outer sleeve of the drive arm. The outer sleeve of the drive arm is rotatably connected to the non-threaded part of the threaded control rod 403. The second drive unit 20 further includes a second ring 202 provided at one end of the second rotating arm away from the threaded control rod 403.

[0079] The continuously variable transmission of the present invention further includes a first gear 50 and a second gear 60. One of the first gear 50 and the second gear 60 can be used as the power input end of the continuously variable transmission, and the other can be used as the power output end of the continuously variable transmission. The first gear 50 is drivingly connected to the second drive unit 20. For example, the first gear 50 is drivingly connected to the second ring 202. The second gear 60 is drivingly connected to the first drive unit 10 through the outer sleeve of the drive arm.

[0080] The continuously variable transmission of the present invention further comprises a first load-bearing bearing 70 and a second load-bearing bearing 80. Figure 7 As shown, the first load-bearing bearing 70 and the second load-bearing bearing 80 are respectively disposed at two ends of the threaded control rod 403 to improve the structural stability of the continuously variable transmission.

[0081] The working principle of the third embodiment of the continuously variable transmission of the present invention is described in detail below.

[0082] Reference Figures 5 to 7 As shown, the first gear 50 is used as the power input end of the continuously variable transmission, and the second gear 60 is used as the power output end of the continuously variable transmission. The first gear 50 is driven by the driving force to drive the second transmission unit 20 to drive the second transmission arm 201 to rotate. The second transmission arm 201 drives the first transmission arm 101 to rotate through the ball 30. The first transmission arm 101 drives the first gear 50 to rotate through the transmission arm outer sleeve to realize power transmission. When it is necessary to change the ratio of the power input lever arm to the power output lever arm between the first transmission arm 101 and the second transmission arm 201, the variable diameter control gear 401 is rotated to drive the threaded control rod 403 to rotate, and the third bearing 408 is threadedly connected to the threaded control rod 403. The threaded control rod 403 rotates to drive the third bearing 408 to move axially. The axial movement of the third bearing 408 drives the control rod 409 to pitch relative to the third bearing 408, and the retaining frame 410 drives the ball 30 to move along the first slide groove 1011 and the second slide groove 2011, so that the ball 30 moves to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are transmission-engaged at different radial positions through the ball 30, and the ratio of the power input lever arm to the power output lever arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0083] Example 4

[0084] Reference Figures 8 to 10 As shown, the continuously variable transmission of Example 4 is basically the same as the continuously variable transmission of Example 3, with one difference being that the continuously variable transmission in Example 4 includes a center rod 103, and the first transmission arm 101 and the second gear 60 are respectively transmission-connected to the center rod 103.

[0085] In addition, refer to Figures 8 to 10As shown, the variable diameter control unit includes a threaded outer shaft sleeve 405, a variable diameter control gear 401 drivingly connected to the threaded outer shaft sleeve 405, a fourth bearing 411 threadedly connected to the threaded outer shaft sleeve 405, and a connection assembly. One end of the connection assembly is pivotally connected to the outer wall of the fourth bearing 411, and the other end is connected to the rolling element. The center rod 103 is rotatably inserted into the threaded outer shaft sleeve 405. The connection assembly includes a control rod 409 and a cage 410. One end of the control rod 409 is pivotally connected to the outer wall of the fourth bearing 411, and the other end is connected to the cage 410. Ball bearings 30 are provided in the cage 410.

[0086] The working principle of the fourth embodiment of the continuously variable transmission of the present invention will be specifically described below.

[0087] Refer to Figures 8 to 10 As shown, the first gear 50 is used as the power input end of the continuously variable transmission, and the second gear 60 is used as the power output end of the continuously variable transmission. The first gear 50 is driven by a driving force to drive the second transmission unit 20 to drive the second transmission arm 201 to rotate. The second transmission arm 201 drives the first transmission arm 101 to rotate through the ball bearings 30. The first transmission arm 101 drives the first gear 50 to rotate through the center rod 103 to achieve power transmission. When it is necessary to change the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201, the variable diameter control gear 401 is rotated, thereby driving the threaded outer shaft sleeve 405 to rotate. The fourth bearing 411 is threadedly connected to the threaded outer shaft sleeve 405. The rotation of the threaded outer shaft sleeve 405 drives the fourth bearing 411 to move axially. The axial movement of the fourth bearing 411 drives the control rod 409 to pitch relative to the fourth bearing 411, and drives the ball bearings 30 to move along the first chute 1011 and the second chute 2011 through the cage 410, so that the ball bearings 30 move to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are in driving engagement at different radial positions through the ball bearings 30, and the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0088] Embodiment 5

[0089] This embodiment is used to illustrate the fifth embodiment of the continuously variable transmission provided by the present invention.

[0090] Refer to Figures 11 to 14As shown, the continuously variable transmission provided by the present invention includes a first transmission unit 10 and a second transmission unit 20. The first transmission unit 10 and the second transmission unit 20 are arranged relative to the same central axis. The first transmission unit 10 includes a plurality of first transmission arms 101 uniformly arranged along the rotation surface of the first transmission unit 10. The first transmission arms 101 are inclined relative to the above-mentioned central axis. The second transmission unit 20 includes a plurality of second transmission arms 201 uniformly arranged along the rotation surface of the second transmission unit 20. The second transmission arms 201 are inclined relative to the above-mentioned central axis. The inclination directions of the first transmission arms 101 and the second transmission arms 201 are substantially the same. The second transmission arms 201 are hollow. The first transmission arms 101 can be nested inside the second transmission arms 201, so that the first transmission arms 101 and the second transmission arms 201 are arranged relatively parallel. Of course, it can also be that the first transmission arms 101 are hollow and the second transmission arms 201 can be nested inside the first transmission arms 101, which will not be elaborated here. A first sliding groove 1011 is formed on the side surface of the first transmission arm 101 facing the second transmission arm 201, and a second sliding groove 2011 is formed on the side surface of the second transmission arm 201 facing the first transmission arm 101. The continuously variable transmission provided by the present invention further includes a rolling body, such as a ball 30. The ball 30 can be arranged between the first transmission arm 101 and the second transmission arm 201. For example, the ball 30 can be respectively arranged in the first sliding groove 1011 and the second sliding groove 2011, that is, the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged through the ball 30.

[0091] Furthermore, the continuously variable transmission of the present invention further includes a variable diameter control unit. By driving the ball 30 to move along the first sliding groove 1011 and the second sliding groove 2011 through the variable diameter control unit, the ball 30 is moved to different radial positions, so that the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged through the rolling body at different radial positions. Specifically, refer to Figures 11 to 14As shown, the variable diameter control unit includes a threaded control rod 403, a variable diameter control gear 401 drivingly connected to the threaded control rod 403, a fifth bearing 412 threadedly connected to the threaded control rod 403, and a variable diameter control frame 413. One end of the variable diameter control frame 413 is connected to the outer wall of the fifth bearing 412. The variable diameter control frame 413 can pass through the gap between the first transmission arm 101 and the second transmission arm 201. The variable diameter control frame 413 is inclined relative to the threaded control rod 403, and the variable diameter control frame 413 extends in opposite directions relative to the first transmission arm 101 or the second transmission arm 201, so that the variable diameter control frame 413 is in a cross shape relative to the first transmission arm 101 or the second transmission arm 201. Rolling elements such as balls 30 are embedded in the variable diameter control frame 413 and can move along the extending direction of the variable diameter control frame 413, that is, the balls 30 can move in the variable diameter control frame 413, the first chute 1011, and the second chute 2011 at the same time. The non-threaded part of the threaded control rod 403 can be rotatably connected to the first transmission unit 10.

[0092] Further, as Figures 11 to 14 shown, the first transmission unit 10 further includes a first ring 102, the first ring 102 is disposed at one end of the first transmission arm 101 away from the threaded control rod 403. The second transmission unit 20 further includes a second ring 202, the second ring 202 is disposed at one end of the second transmission arm 201 away from the threaded control rod 403. At the same time, the second transmission unit 20 further includes a fourth ring, the fourth ring is disposed at one end of the second transmission arm 201 close to the threaded control rod 403. The variable diameter control unit further includes a third ring 414, the third ring 414 is disposed at one end of the variable diameter control frame 413 away from the threaded control rod 403.

[0093] The continuously variable transmission of the present invention further includes a first gear 50 and a second gear 60. One of the first gear 50 and the second gear 60 can be used as the power input end of the continuously variable transmission, and the other can be used as the power output end of the continuously variable transmission. The first gear 50 is drivingly connected to the second transmission unit 20. For example, the first gear 50 is drivingly connected to the second ring 202. The second gear 60 is drivingly connected to the first transmission unit 10. For example, the first transmission unit 10 further includes an outer shaft sleeve of the transmission arm, and the first transmission arm 101 and the second gear 60 are respectively connected to the outer peripheral wall of the outer shaft sleeve of the transmission arm.

[0094] The continuously variable transmission of the present invention further includes a first load-bearing bearing 70 and a second load-bearing bearing 80. Referring to Figures 11 to 14 shown, the first load-bearing bearing 70 and the second load-bearing bearing 80 are respectively disposed at both ends of the threaded control rod 403 to improve the structural stability of the continuously variable transmission.

[0095] Next, the working principle of the fifth embodiment of the continuously variable transmission of the present invention will be specifically described.

[0096] Refer to Figures 11 to 14 As shown, the first gear 50 is used as the power input end of the continuously variable transmission, and the second gear 60 is used as the power output end of the continuously variable transmission. The first gear 50 is driven by a driving force to drive the second transmission unit 20 to drive the second transmission arm 201 to rotate. The second transmission arm 201 drives the first transmission arm 101 to rotate through the ball 30. The first transmission arm 101 drives the first gear 50 to rotate through the outer shaft sleeve of the transmission arm, realizing power transmission. When it is necessary to change the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201, the variable diameter control gear 401 is rotated, thereby driving the threaded control rod 403 to rotate. The fifth bearing 412 is threadedly connected to the threaded control rod 403. The rotation of the threaded control rod 403 drives the fifth bearing 412 to move axially. The axial movement of the fifth bearing 412 drives the variable diameter control frame 413 to move axially, and further drives the ball 30 to move along the variable diameter control frame 413, so that the ball 30 moves to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are in transmission engagement at different radial positions through the ball 30, and the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0097] Embodiment 6

[0098] This embodiment is used to illustrate the sixth implementation manner of the continuously variable transmission provided by the present invention.

[0099] Refer to Figures 15 to 17As shown in the figure, the continuously variable transmission provided by the present invention includes a first transmission unit 10 and a second transmission unit 20. The first transmission unit 10 and the second transmission unit 20 are arranged relative to the same central axis. The first transmission unit 10 includes a plurality of first transmission arms 101 evenly arranged along the rotation surface of the first transmission unit 10. The first transmission arms 101 are perpendicularly arranged relative to the above-mentioned central axis. The second transmission unit 20 includes a plurality of second transmission arms 201 evenly arranged along the rotation surface of the second transmission unit 20. The second transmission arms 201 are perpendicularly arranged relative to the above-mentioned central axis. The second transmission arms 201 are hollow. The first transmission arms 101 can be nested inside the second transmission arms 201, so that the first transmission arms 101 and the second transmission arms 201 are arranged in parallel relative to each other. Of course, it can also be that the first transmission arms 101 are hollow and the second transmission arms 201 can be nested inside the first transmission arms 101, which will not be elaborated here. A first chute 1011 is provided on the side surface of the first transmission arm 101 facing the second transmission arm 201. A second chute 2011 is provided on the side surface of the second transmission arm 201 facing the first transmission arm 101. The continuously variable transmission provided by the present invention further includes a rolling body, such as a ball 30. The ball 30 can be arranged between the first transmission arm 101 and the second transmission arm 201. For example, the ball 30 can be respectively arranged in the first chute 1011 and the second chute 2011. That is, the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged through the ball 30.

[0100] Furthermore, the continuously variable transmission of the present invention further includes a variable diameter control unit. By driving the ball 30 to move along the first chute 1011 and the second chute 2011 through the variable diameter control unit, the ball 30 is moved to different radial positions, so that the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged through the rolling body at different radial positions. Specifically, as shown in Figures 15 to 17 the figure, the variable diameter control unit includes a variable diameter control disk 415, a variable diameter control gear 401 that can be transmissionally connected to the variable diameter control disk 415, and a connection component that is respectively connected to the variable diameter control disk 415 and the rolling body. The number of variable diameter control disks 415 can be one or two. For example, as Figures 15 to 17As shown, the variable diameter control disc 415 is arranged on the side of the first transmission unit 10 away from the second transmission unit 20 and on the side of the second transmission unit 20 away from the first transmission unit 10. The variable diameter control disc 415 includes a hollow first disc body 4151, a second disc body 4152 and a connecting member 4153 connected between the first disc body 4151 and the second disc body 4152. The outer edge of the second disc body 4152 is formed with teeth that can be meshed and connected with the variable diameter control gear 401. The connecting member 4153 is formed with a hollow connecting groove. The center line of the connecting groove is inclined relative to the center line of the first transmission arm 101 and the second transmission arm 201. One end of the connecting assembly can be slidably connected to the connecting groove. The continuously variable transmission also includes a center rod 103 that is rotatably connected to the first disc body 4151 and the first transmission unit 10 respectively. The connecting assembly includes a retaining frame 410, one end of which is provided with a ball 30, and the other end is arranged in the connecting groove and can slide along the connecting groove.

[0101] The continuously variable transmission of the present invention further comprises a first gear 50 and a second gear 60, one of which can be used as the power input end of the continuously variable transmission, and the other can be used as the power output end of the continuously variable transmission, and the first gear 50 is in transmission connection with the second transmission unit 20, for example, the first gear 50 is in transmission connection with the end of the second transmission arm 201 away from the center rod 103, or the end of the second transmission arm 201 away from the center rod 103 is provided with a second ring 202, and the first gear 50 is in transmission connection with the second ring 202. The second gear 60 is in transmission connection with the first transmission unit 10, for example, the first transmission unit 10 further comprises a transmission arm outer sleeve 105, and the first transmission arm 101 and the second gear 60 are respectively connected to the outer peripheral wall of the transmission arm outer sleeve 105.

[0102] The continuously variable transmission of the present invention also includes a center rod 103, which is rotatably connected to the first disk body 4151, the transmission arm disc 203 and the transmission arm outer sleeve 105 through the fourth support bearing 4154, the third support bearing 204 and the second support bearing 104 respectively, and the transmission arm disc 203 is connected to one end of the second transmission arm close to the center rod.

[0103] The continuously variable transmission of the present invention further comprises a first load-bearing bearing 70 and a second load-bearing bearing 80. Figures 15 to 17 As shown, the first load-bearing bearing 70 and the second load-bearing bearing 80 are respectively disposed at two ends of the center rod 103 to improve the structural stability of the continuously variable transmission.

[0104] The working principle of the sixth embodiment of the continuously variable transmission of the present invention is described in detail below.

[0105] Reference Figures 15 to 17As shown, the first gear 50 is used as the power input end of the continuously variable transmission, and the second gear 60 is used as the power output end of the continuously variable transmission. The first gear 50 is driven by a driving force to drive the second transmission unit 20 to drive the second transmission arm 201 to rotate. The second transmission arm 201 drives the first transmission arm 101 to rotate through the ball 30. The first transmission arm 101 drives the first gear 50 to rotate through the outer shaft sleeve 105 of the transmission arm, realizing power transmission. When it is necessary to change the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201, the variable diameter control gear 401 rotates, thereby driving the variable diameter control disk 415 to rotate relative to the first transmission arm 101 and the second transmission arm 201, changing the diameter, so that the connection groove rotates relative to the first transmission arm 101 and the second transmission arm 201. Since the connection groove is inclined with respect to the first transmission arm 101 and the second transmission arm 201, the cage 410 is driven to move relative to the first sliding groove 1011 and the second sliding groove 2011 through the connection groove, and then the ball 30 is driven to move to different radial positions. Moreover, the first transmission arm 101 and the second transmission arm 201 are in transmission engagement at different radial positions through the ball 30, and the ratio of the power input arm to the power output arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0106] In addition, to more favorably drive the cage 410 to move relative to the first sliding groove 1011 and the second sliding groove 2011 by the connection groove, refer to Figures 15 to 17 As shown, the center line of the connection groove forms an involute of the first disk body 4151.

[0107] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solutions of the present invention. For example, the cross-sectional shape of the shafts of the first transmission arm and the second transmission arm is changed to an arc shape, and various specific technical features are combined in any suitable manner. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods. However, these simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A continuously variable transmission, characterized in that, Comprising: A first transmission unit (10) and a second transmission unit (20) arranged coaxially. The first transmission unit (10) includes a first transmission arm (101), and the second transmission unit (20) includes a second transmission arm (201). The first transmission arm (101) and the second transmission arm (201) are nested with each other. Rolling elements, which can respectively abut against the first transmission arm (101) and the second transmission arm (201). And, A diameter-changing control unit, which is configured to be able to drive the rolling elements to move to different radial positions, so that the first transmission arm (101) and the second transmission arm (201) are in transmission engagement at different radial positions through the rolling elements.

2. The continuously variable transmission according to claim 1, wherein, One of the first transmission unit (10) and the second transmission unit (20) is in transmission connection with the power input end of the continuously variable transmission, and the other is in transmission connection with the power output end of the continuously variable transmission.

3. The continuously variable transmission according to claim 1, wherein, The first transmission unit (10) includes a plurality of the first transmission arms (101) uniformly arranged along the rotation surface of the first transmission unit (10). The second transmission unit (20) includes a plurality of the second transmission arms (201) uniformly arranged along the rotation surface of the second transmission unit (20), and the number of the first transmission arms (101) is the same as the number of the second transmission arms (201).

4. The continuously variable transmission according to claim 1, characterized in that, The rolling elements include balls (30). A first chute (1011) is formed on the side surface of the first transmission arm (101) facing the second transmission arm (201), and a second chute (2011) is formed on the side surface of the second transmission arm (201) facing the first transmission arm (101). The balls (30) are respectively in rolling connection with the first chute (1011) and the second chute (2011).

5. The continuously variable transmission according to any one of claims 1-4, characterized in that, The first transmission arm (101) and the second transmission arm (201) are nested with each other in a cross manner. The diameter-changing control unit is configured to be able to drive at least one of the first transmission unit (10) and the second transmission unit (20) to axially move relative to the other, so that the first transmission arm (101) and the second transmission arm (201) are in transmission engagement at different radial positions through the rolling elements.

6. The continuously variable transmission according to any one of claims 5, characterized in that, The diameter-changing control unit includes a threaded control rod (403), a diameter-changing control gear (401) in transmission connection with the threaded control rod (403), and an axially moving assembly threadedly connected to the threaded control rod (403). The axially moving assembly is connected to the first transmission arm (101).

7. The continuously variable transmission according to claim 6, wherein The axially moving assembly includes a first bearing (404) threadedly connected to the threaded control rod (403) and an outer shaft sleeve (402) sleeved outside the first bearing (404). The outer shaft sleeve (402) is connected to the first transmission arm (101).

8. The continuously variable transmission according to any one of claims 5, characterized in that, The variable diameter control unit comprises a variable diameter control gear (401), a threaded outer sleeve (405) threadedly connected to the variable diameter control gear (401), an inner sleeve (406) sleeved on the inner side of the threaded outer sleeve (405), and a second bearing (407) supported between the threaded outer sleeve (405) and the inner sleeve (406); the continuously variable transmission also comprises a center rod (103) capable of slidingly engaging with the inner circumferential wall of the inner sleeve (406); and the first transmission unit (10) is sleeved on one end of the inner sleeve (406) extending through the threaded outer sleeve (405).

9. The continuously variable transmission according to claim 5, wherein, The first transmission unit (10) further comprises a first ring (102) connected to at least one end of the first transmission arm (101); and / or, The second transmission unit (20) further comprises a second ring (202) connected to at least one end of the second transmission arm (201).

10. The continuously variable transmission according to any one of claims 1-4, characterized in that, The first transmission arm (101) and the second transmission arm (201) are arranged in parallel and nested with each other, and the variable diameter control unit is configured to be able to drive the rolling body to move to different radial positions along the extension direction of the center line of the first transmission arm (101) or the second transmission arm (201), so that the first transmission arm (101) and the second transmission arm (201) are connected through the rolling body transmission at different radial positions.

11. The continuously variable transmission according to claim 10, wherein, The variable diameter control unit comprises a threaded control rod (403), a variable diameter control gear (401) transmission-connected to the threaded control rod (403), an axial moving component threadedly connected to the threaded control rod (403), and a connecting component, one end of the connecting component is pivotally connected to the outer wall of the axial moving component, and the other end is connected to the rolling body, and the non-threaded portion of the threaded control rod (403) can be rotationally connected to the first transmission unit (10).

12. The continuously variable transmission according to claim 11, wherein, The axial movement component comprises a third bearing (408) capable of being threadedly connected to the threaded control rod (403), and the outer wall of the third bearing (408) is pivotally connected to the connection component.

13. The continuously variable transmission according to claim 10, characterized in that, The variable diameter control unit comprises a threaded outer sleeve (405), a variable diameter control gear (401) transmission-connected to the threaded outer sleeve (405), an axial moving component threadedly connected to the threaded outer sleeve (405), and a connecting component, one end of the connecting component is pivotally connected to the outer wall of the axial moving component, and the other end is connected to the rolling body, the first transmission unit (10) comprises a center rod (103) connected to the first transmission arm (101), and the center rod (103) can be rotatably inserted into the threaded outer sleeve (405).

14. The continuously variable transmission according to claim 13, wherein The axial movement component comprises a fourth bearing (411) capable of being threadedly connected to the threaded outer sleeve (405), and the outer wall of the fourth bearing (411) is pivotally connected to the connection component.

15. The continuously variable transmission according to claim 10, characterized in that, The second transmission unit (20) further comprises a second ring (202) connected to at least one end of the second transmission arm (201).

16. The continuously variable transmission according to claim 10, characterized in that, The variable diameter control unit includes a threaded control rod (403), a variable diameter control gear (401) drivingly connected to the threaded control rod (403), an axially moving assembly threadedly connected to the threaded control rod (403), and a variable diameter control frame (413). One end of the variable diameter control frame (413) is connected to the outer wall of the axially moving assembly. The variable diameter control frame (413) can pass through the gap between the first transmission arm (101) and the second transmission arm (201). The rolling elements are embedded in the variable diameter control frame (413) and can move along the extending direction of the variable diameter control frame (413). The non-threaded part of the threaded control rod (403) can be rotatably connected to the first transmission unit (10).

17. The continuously variable transmission according to claim 16, characterized in that, The axially moving assembly includes a fifth bearing (412) that can be threadedly connected to the threaded control rod (403). The outer wall of the fifth bearing (412) is connected to the variable diameter control frame (413).

18. The continuously variable transmission according to claim 16, characterized in that, The first transmission unit (10) further includes a first ring (102) connected to at least one end of the first transmission arm (101); and / or, The second transmission unit (20) further includes a second ring (202) connected to at least one end of the second transmission arm (201); and / or, The continuously variable transmission further includes a third ring (414) connected to the end of the variable diameter control frame (413) away from the axially moving assembly.

19. The continuously variable transmission according to claim 10, characterized in that, The variable diameter control unit includes a variable diameter control disc (415), a variable diameter control gear (401) that can be drivingly connected to the variable diameter control disc (415), and a connecting assembly respectively connected to the variable diameter control disc (415) and the rolling elements. The variable diameter control disc (415) is disposed on the side of the first transmission unit (10) away from the second transmission unit (20) and / or on the side of the second transmission unit (20) away from the first transmission unit (10). The variable diameter control disc (415) includes a hollow first disc body (4151), a second disc body (4152), and a connecting member (4153) connecting the first disc body (4151) and the second disc body (4152). The outer edge of the second disc body (4152) is formed with teeth that can be meshingly connected to the variable diameter control gear (401). The connecting member (4153) is formed with a hollow connecting groove. The center line of the connecting groove is inclined with respect to the center lines of the first transmission arm (101) and the second transmission arm (201). One end of the connecting assembly can be slidably connected in the connecting groove. The continuously variable transmission further includes a center rod (103) respectively rotatably connected to the first disc body (4151) and the first transmission unit (10).

20. The continuously variable transmission according to claim 19, wherein, The center line of the connecting groove is formed as an involute of the first disc body (4151).

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