Continuously variable transmission

Abstract

The utility model 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. 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 utility model relates to transmission technical field, concretely relates to a continuously variable transmission. BACKGROUND

[0002] The transmission is needed to be applied in the automobile manufacturing field, the motorcycle manufacturing field, the bicycle manufacturing field, the industrial machine manufacturing field, the speed reducer manufacturing field and the like, however, the transmission used in the above-mentioned many fields has the defects such as high manufacturing cost and maintenance cost, complex structure, low transmission efficiency and the like.For example, in the automobile manufacturing field, E-CVT electronic automatic transmission is double-cone and high-toughness steel belt structure, can continuously change transmission ratio, transmission smoothness is good, fuel economy is good, the shortcoming is: limited torque is borne, the structure is complex, the manufacturing cost is higher, DCT double-clutch transmission is lower in comfort, has high failure rate, and the maintenance cost is also relatively high, AT hydraulic automatic transmission is low in transmission efficiency, the structure is complex, and the price is high.In the bicycle manufacturing field, the transmission usually cannot realize stepless speed change, and the obvious jerk is felt when riding and shifting, and the transmission can only be realized when the middle shaft is rotated to ride, so the use is very inconvenient.In the motorcycle manufacturing field, the automatic separation continuously variable transmission used has the problems of weak transmission capacity, weak stability, and abnormal reaction such as shaking and slipping in the use process.In the industrial robot and intelligent robot manufacturing field, the speed reducer is the core component of robot movement, and the small mobile robot has higher requirements on speed, efficiency and load capacity, and the continuously variable transmission has the advantage that the transmission ratio can be continuously changed, so that the adaptability of the small mobile robot in complex road conditions can be effectively solved, however, the size and weight of the continuously variable transmission are limited, so that most of the existing continuously variable transmissions cannot be directly applied thereto.In the speed reducer manufacturing field, the flexible wheel of the commonly used harmonic speed reducer is prone to fatigue damage, has large rotational inertia and starting torque, and has large processing and manufacturing difficulty and complex process flow, the RV speed reducer is greatly affected by process and assembly, has high requirements on wear resistance and high rigidity of the gear, and needs special part processing and precision assembly technology, and the planetary speed reducer and the cycloidal pin wheel speed reducer cannot bear large load, are troublesome to disassemble and assemble, and have high maintenance cost. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at overcoming at least one of the above technical problems of the existing transmission, and provides a continuously variable transmission, which has the characteristics of simple structure, small size, long service life, stable and reliable power transmission, wide application range and the like.

[0004] In order to achieve the above object, the utility model provides a continuously variable transmission, it includes: the coaxial first transmission unit and second transmission unit, the first transmission unit includes first transmission arm, the second transmission unit includes second transmission arm, the first transmission arm and the second transmission arm between each other nested arrangement, the rolling body, the rolling body can respectively with the first transmission arm and the second transmission arm between the abutment, and the variable diameter control unit, the variable diameter control unit is configured to be able to drive the rolling body moves to different radial position, so that the first transmission arm and the second transmission arm in different radial position through the rolling body transmission joint.

[0005] The continuously variable transmission provided by the utility model, the first transmission arm of the first transmission unit and the second transmission arm of the second transmission unit are transmissionally engaged through the rolling body, the variable diameter control unit can control the rolling body to move to different radial positions, so that the transmission engagement position of the first transmission arm and the second transmission arm changes. When the first transmission unit or the second transmission unit is driven to start rotating, the first transmission arm and the second transmission arm rotate together, so that the transmission combination position of the first transmission arm and the second transmission arm changes, and the ratio of the power input force arm to the power output force arm between the first transmission arm and the second transmission arm changes, thereby changing the torque output by the continuously variable transmission, and finally changing the output speed of the continuously variable transmission. Moreover, since the driving of the rolling body to move to different radial positions by the variable diameter control unit is a continuous change process, the change of the output speed of the continuously variable transmission provided by the utility model is also continuous, and no obvious jerk feeling is generated. In addition, the continuously variable transmission provided by the utility model also has the advantages of simple structure, low manufacturing and maintenance cost, adaptability to different installation space requirements, meeting the production and installation requirements of different manufacturing fields, and wide application range.

[0006] In addition, compared with the direct friction contact mode 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 transmissionally engaged through the rolling body, and the rolling body is in rolling friction with the first transmission arm and the second transmission arm, which can reduce the friction between the rolling body 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 transmissionally engagement between the first transmission arm of the first transmission unit and the second transmission arm of the second transmission unit through the rolling body also helps to reduce the working noise of the continuously variable transmission during operation.

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

[0008] In some embodiments, the first transmission unit comprises a plurality of the first transmission arms arranged uniformly along a rotation surface of the first transmission unit, the second transmission unit comprises a plurality of the second transmission arms arranged uniformly along a 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 body comprises a rolling ball, a first sliding groove is formed on a side of the first transmission arm facing the second transmission arm, a second sliding groove is formed on a side of the second transmission arm facing the first transmission arm, and the rolling ball is rolling connected in the first sliding groove and the second sliding groove respectively.

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

[0011] In some embodiments, the variable-diameter control unit comprises a threaded control rod, a variable-diameter control gear drivingly connected with the threaded control rod, and an axial movement assembly threadedly connected with the threaded control rod, the axial movement assembly being connected with the first transmission arm.

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

[0013] In some embodiments, the variable-diameter control unit comprises a variable-diameter control gear, a threaded outer shaft sleeve threadedly connected with 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 comprises a center rod axially slidingly fitted with an inner peripheral wall of the inner shaft sleeve, and the first transmission unit is sleeved on an end of the inner shaft sleeve extending out of the threaded outer shaft sleeve.

[0014] In some embodiments, the first transmission unit further comprises a first circular ring connected to at least one end of the first transmission arm; and / or the second transmission unit further comprises a second circular 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 arranged in parallel and nested with each other, and the variable-diameter control unit is configured to drive the rolling body to move to different radial positions along the central line extension direction of the first transmission arm or the second transmission arm, so that the first transmission arm and the second transmission arm are transmissionally engaged by the rolling body at different radial positions.

[0016] In some embodiments, the variable-diameter control unit comprises a threaded control rod, a variable-diameter control gear transmissionally connected with the threaded control rod, an axial movement assembly threadedly connected with the threaded control rod, and a connecting assembly, one end of the connecting assembly is pivotally connected with the outer wall of the axial movement assembly, and the other end is connected with the rolling body, and the non-threaded portion of the threaded control rod is rotationally connected with the first transmission unit.

[0017] In some embodiments, the axial movement assembly comprises a third bearing threadedly connected with the threaded control rod, and the outer wall of the third bearing is pivotally connected with the connecting assembly.

[0018] In some embodiments, the variable-diameter control unit comprises a threaded outer sleeve, a variable-diameter control gear transmissionally connected with the threaded outer sleeve, an axial movement assembly threadedly connected with the threaded outer sleeve, and a connecting assembly, one end of the connecting assembly is pivotally connected with the outer wall of the axial movement assembly, and the other end is connected with the rolling body, and the first transmission unit comprises a central rod connected with the first transmission arm, and the central rod is rotatably arranged in the threaded outer sleeve.

[0019] In some embodiments, the axial movement assembly comprises a fourth bearing threadedly connected with the threaded outer sleeve, and the outer wall of the fourth bearing is pivotally connected with the connecting assembly.

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

[0021] In some embodiments, the variable-diameter control unit comprises a threaded control rod, a variable-diameter control gear transmissionally connected with the threaded control rod, an axial movement assembly threadedly connected with the threaded control rod, and a variable-diameter control frame, one end of the variable-diameter control frame is connected to the outer wall of the axial movement assembly, the variable-diameter control frame can pass through the gap between the first transmission arm and the second transmission arm, the rolling body is embedded in the variable-diameter control frame and can move along the extension direction of the variable-diameter control frame, and the non-threaded portion of the threaded control rod is rotationally connected with the first transmission unit.

[0022] In some embodiments, the axial movement assembly comprises a fifth bearing capable of being threadedly connected with the threaded control rod, and an outer wall of the fifth bearing is connected with the variable-diameter control frame.

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

[0024] In some embodiments, the variable-diameter control unit comprises a variable-diameter control disc, a variable-diameter control gear capable of being transmissionally connected with the variable-diameter control disc, and a connecting assembly respectively connected with the variable-diameter control disc and the rolling body, the variable-diameter control disc is arranged on a side of the first transmission unit away from the second transmission unit and / or arranged on a side of the second transmission unit away from the first transmission unit, the variable-diameter control disc comprises a hollow first disc body, a second disc body, and a connecting piece connected between the first disc body and the second disc body, an outer edge of the second disc body is formed with teeth capable of being meshingly connected with the variable-diameter control gear, the connecting piece is formed with a hollow connecting groove, a center line of the connecting groove is arranged obliquely relative to center lines of the first transmission arm and the second transmission arm, one end of the connecting assembly is capable of being slidingly connected in the connecting groove, and the continuously variable transmission further comprises a center rod rotationally connected with the first disc body and the first transmission unit respectively.

[0025] In some embodiments, the center line of the connecting groove is formed as an involute of the first disc body.

[0026] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of a three-dimensional structure of a first embodiment of the continuously variable transmission provided by the present application;

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

[0029] Figure 3 is a schematic diagram of a three-dimensional structure of a second embodiment of the continuously variable transmission provided by the present application;

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

[0031] Figure 5is the first perspective view of the third embodiment of the continuously variable transmission provided by the utility model;

[0032] Figure 6 is the second perspective view of the third embodiment of the continuously variable transmission provided by the utility model;

[0033] Figure 7 is Figure 5 and Figure 6 the exploded view of the continuously variable transmission in the and ;

[0034] Figure 8 is the first perspective view of the fourth embodiment of the continuously variable transmission provided by the utility model;

[0035] Figure 9 is the second perspective view of the fourth embodiment of the continuously variable transmission provided by the utility model;

[0036] Figure 10 is Figure 8 and Figure 9 the exploded view of the continuously variable transmission in the and ;

[0037] Figure 11 is the first perspective view of the fifth embodiment of the continuously variable transmission provided by the utility model;

[0038] Figure 12 is the second perspective view of the fifth embodiment of the continuously variable transmission provided by the utility model;

[0039] Figure 13 is Figure 11 and Figure 12 the exploded view of the continuously variable transmission in the and from the first perspective view;

[0040] Figure 14 is Figure 11 and Figure 12 the exploded view of the continuously variable transmission in the and from the second perspective view;

[0041] Figure 15 is the first perspective view of the sixth embodiment of the continuously variable transmission provided by the utility model;

[0042] Figure 16 is the second perspective view of the sixth embodiment of the continuously variable transmission provided by the utility model;

[0043] Figure 17 is Figure 15 and Figure 16 the exploded view of the continuously variable transmission in the and.

[0044] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0045] 10-first transmission unit; 101-first transmission arm; 1011-first sliding groove; 102-first circular ring; 103-center rod; 104-second support bearing; 105-transmission arm outer sleeve; 20-second transmission unit; 201-second transmission arm; 2011-second sliding groove; 202-second circular ring; 203-transmission arm disc; 204-third support bearing; 30-rolling ball; 401-diameter changing control gear; 402-outer sleeve; 403-thread control rod; 404-first bearing; 405-thread outer sleeve; 406-inner sleeve; 407-second bearing; 408-third bearing; 409-control rod; 410-retainer; 411-fourth bearing; 412-fifth bearing; 413-diameter changing control frame; 414-third circular ring; 415-diameter changing control disc; 4151-first disc body; 4152-second disc body; 4153-connector; 4154-fourth support bearing; 50-first gear; 501-first support bearing; 60-second gear; 70-first load bearing; 80-second load bearing. DETAILED DESCRIPTION

[0046] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0047] In the present application, the orientation or position relationship indicated by the terms "upper, lower, left, right, inner, outer, top, bottom" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

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

[0049] In the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled person in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0050] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The present application provides a kind of continuously variable transmission, referring to Figures 1 to 17 As shown in the figure, the continuously variable transmission includes: coaxially arranged first transmission unit 10 and second transmission unit 20, first transmission unit 10 includes first transmission arm 101, second transmission unit 20 includes second transmission arm 201, first transmission arm 101 and second transmission arm 201 are nested with each other;Rolling body, the rolling body can be respectively with first transmission arm 101 and second transmission arm 201 abut;And variable diameter control unit, variable diameter control unit is configured to be able to drive rolling body to move to different radial positions, so that first transmission arm 101 and second transmission arm 201 are driven to engage in different radial positions by rolling body.

[0052] The continuously variable transmission provided by the utility model, 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 the rolling body, and the variable-diameter control unit can control the rolling body to move to different radial positions, so that the transmission engagement position of the first transmission arm 101 and the second transmission arm 201 changes. When the first transmission unit 10 or the second transmission unit 20 is driven to start rotating, the first transmission arm 101 and the second transmission arm 201 rotate together, so that the transmission engagement position of the first transmission arm 101 and the second transmission arm 201 changes, and the ratio of the power input force arm and the power output force 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 driving of the rolling body to move to different radial positions by the variable-diameter control unit is a continuous change process, the change of the output speed of the continuously variable transmission provided by the utility model is also continuous, and no obvious jerk feeling is generated. In addition, the continuously variable transmission provided by the utility model also has the advantages of simple structure, low manufacturing and maintenance cost, and can adapt to different installation space requirements to meet the production and installation requirements of different manufacturing fields, and has a wide range of applications.

[0053] In addition, compared with the direct friction contact mode 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 the rolling body, and the rolling body is in rolling friction with the first transmission arm 101 and the second transmission arm 201, so that the friction between the rolling body and the first transmission arm 101 and the second transmission arm 201 can be reduced, 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 the rolling body, which is also helpful to reduce the working noise of the continuously variable transmission during operation.

[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 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, wherein one of the first gear 50 and the second gear 60 can serve as the power input end of the continuously variable transmission, and the other can serve as the power output end of the continuously variable transmission.

[0055] In some embodiments, the first transmission unit 10 comprises a plurality of first transmission arms 101 arranged uniformly along the rotation surface of the first transmission unit 10, and the second transmission unit 20 comprises a plurality of second transmission arms 201 arranged uniformly 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.

[0056] In some embodiments, the rolling body comprises a ball 30, a first sliding groove 1011 is formed on the side of the first transmission arm 101 facing the second transmission arm 201, a second sliding groove 2011 is formed on the side of the second transmission arm 201 facing the first transmission arm 101, and the ball 30 is rollingly connected in the first sliding groove 1011 and the second sliding groove 2011, respectively. Of course, the rolling body in the present application can also comprise, but is not limited to, a cylinder, a bearing, etc.

[0057] In some embodiments, referring to Figures 1 to 4 the first transmission arm 101 and the second transmission arm 201 are arranged in a cross-nested manner, i.e., the first transmission arm 101 and the second transmission arm 201 extend in opposite inclined directions, 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 cross shape, and the variable-diameter control unit is configured to drive at least one of the first transmission unit 10 and the second transmission unit 20 to move axially relative to the other, so that the first transmission arm 101 and the second transmission arm 201 are drivingly engaged by the rolling body at different radial positions. In this way, the variable-diameter control unit drives at least one of the first transmission unit 10 and the second transmission unit 20 to move axially relative to the other, so that the first transmission arm 101 and the second transmission arm 201 are drivingly engaged by the rolling body at different radial positions, so as to change the ratio of the power input force arm to the power output force arm between the first transmission arm 101 and the second transmission arm 201, so as to change the torque output by the continuously variable transmission, and finally change the output speed of the continuously variable transmission.

[0058] or in other embodiments, referring to Figures 5 to 17As shown, the first transmission arm 101 and the second transmission arm 201 are arranged in parallel and nested with 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 in relative parallel, and the variable-diameter control unit is configured to drive the rolling body to move to different radial positions along the center line extension direction 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 transmissionally engaged at different radial positions through the rolling body. In this way, the variable-diameter control unit drives the rolling body to move to different radial positions, so that the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged at different radial positions through the rolling body, so as to change the ratio of the power input force arm and the power output force 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 embodiment of the continuously variable transmission provided by the utility model.

[0061] Referring to Figure 1 and Figure 2 As shown, the continuously variable transmission provided by the utility model comprises 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 center axis, the first transmission unit 10 comprises a plurality of first transmission arms 101 arranged uniformly along the rotation surface of the first transmission unit 10, the first transmission arms 101 are arranged obliquely relative to the center axis, the second transmission unit 20 comprises a plurality of second transmission arms 201 arranged uniformly along the rotation surface of the second transmission unit 20, the second transmission arms 201 are arranged obliquely relative to the center axis, the oblique directions of the first transmission arms 101 and the second transmission arms 201 are opposite, the second transmission arms 201 are hollow, and the first transmission arms 101 can be nested through the second transmission arms 201, as shown in Figure 1 so that the first transmission arms 101 and the second transmission arms 201 are cross-shaped. Of course, the first transmission arms 101 can also be hollow, and the second transmission arms 201 can be nested through the first transmission arms 101, which will not be described here. A first sliding groove 1011 is formed on the side of the first transmission arm 101 facing the second transmission arm 201, and a second sliding groove 2011 is formed on the side of the second transmission arm 201 facing the first transmission arm 101, and the continuously variable transmission provided by the utility model further comprises a rolling body, for example, a ball 30, which can be arranged between the first transmission arm 101 and the second transmission arm 201, for example, the ball 30 can be arranged in the first sliding groove 1011 and the second sliding groove 2011 respectively, that is, the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged through the ball 30.

[0062] Further, the continuously variable transmission further comprises a diameter changing control unit, at least one of the first transmission unit 10 and the second transmission unit 20 is axially moved relative to the other by the diameter changing control unit, so that the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged by the rolling body at different radial positions. Specifically, as shown in Figure 1 and Figure 2 , the diameter changing control unit comprises a threaded control rod 403, a diameter changing control gear 401 in transmission connection with the threaded control rod 403, a first bearing 404 in threaded connection with the threaded control rod 403, and an outer shaft sleeve 402 sleeved outside the first bearing 404, the outer shaft sleeve 402 is connected with the first transmission arm 101, and an axial key groove or key is arranged on the outer circumferential wall of the outer shaft sleeve 402.

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

[0064] The continuously variable transmission further comprises a first gear 50 and a second gear 60, one of the first gear 50 and the second gear 60 can be used as a power input end of the continuously variable transmission, and the other can be used as a power output end of the continuously variable transmission, 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 second circular ring 202; the second gear 60 is in transmission connection with the first transmission unit 10, for example, an axial key or key groove is arranged on the inner circumferential wall of the second gear 60, so as to be matched with the key groove or key on the outer circumferential wall of the aforementioned outer shaft sleeve 402, and a sliding transmission connection is formed.

[0065] The continuously variable transmission further comprises a first load bearing 70 and a second load bearing 80, as shown in Figure 1 and Figure 2 , the first load bearing 70 and the second load bearing 80 are arranged at both ends of the threaded control rod 403 respectively, so as 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 utility model will be specifically explained below.

[0067] Referring to Figure 1 and Figure 2As shown in FIG. 1 and FIG. 2, the first gear 50 is taken as the power input end of the continuously variable transmission, the second gear 60 is taken as the power output end of the continuously variable transmission, the first gear 50 is driven, the second transmission unit 20 is driven to rotate the second transmission arm 201, the second transmission arm 201 is driven to rotate the first transmission arm 101 through the ball 30, the first transmission arm 101 is driven to rotate the first gear 50 through the outer shaft sleeve 402, and power transmission is realized. When it is needed to change the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201, the variable-diameter control gear 401 is driven to rotate, thereby driving the threaded control rod 403 to rotate, the first bearing 404 is threadedly connected with the threaded control rod 403, the threaded control rod 403 is driven to axially move the first bearing 404, the first bearing 404 is axially moved to drive the outer shaft sleeve 402 to axially move, and then the first transmission arm 101 is axially moved relative to the second transmission arm 201, so that the ball 30 is moved to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged at the different radial positions through the ball 30, and the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201 is changed.

[0068] Embodiment 2

[0069] This embodiment is used to illustrate the second embodiment of the continuously variable transmission.

[0070] Referring to Figure 3 and Figure 4 As shown in FIG. 1 and FIG. 2, the first gear 50 is taken as the power input end of the continuously variable transmission, the second gear 60 is taken as the power output end of the continuously variable transmission, the first gear 50 is driven, the second transmission unit 20 is driven to rotate the second transmission arm 201, the second transmission arm 201 is driven to rotate the first transmission arm 101 through the ball 30, the first transmission arm 101 is driven to rotate the first gear 50 through the outer shaft sleeve 402, and power transmission is realized. When it is needed to change the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201, the variable-diameter control gear 401 is driven to rotate, thereby driving the threaded control rod 403 to rotate, the first bearing 404 is threadedly connected with the threaded control rod 403, the threaded control rod 403 is driven to axially move the first bearing 404, the first bearing 404 is axially moved to drive the outer shaft sleeve 402 to axially move, and then the first transmission arm 101 is axially moved relative to the second transmission arm 201, so that the ball 30 is moved to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged at the different radial positions through the ball 30, and the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201 is changed.

[0071] In addition, referring to Figure 3 and Figure 4 As shown in FIG. 1 and FIG. 2, the first gear 50 is taken as the power input end of the continuously variable transmission, the second gear 60 is taken as the power output end of the continuously variable transmission, the first gear 50 is driven, the second transmission unit 20 is driven to rotate the second transmission arm 201, the second transmission arm 201 is driven to rotate the first transmission arm 101 through the ball 30, the first transmission arm 101 is driven to rotate the first gear 50 through the outer shaft sleeve 402, and power transmission is realized. When it is needed to change the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201, the variable-diameter control gear 401 is driven to rotate, thereby driving the threaded control rod 403 to rotate, the first bearing 404 is threadedly connected with the threaded control rod 403, the threaded control rod 403 is driven to axially move the first bearing 404, the first bearing 404 is axially moved to drive the outer shaft sleeve 402 to axially move, and then the first transmission arm 101 is axially moved relative to the second transmission arm 201, so that the ball 30 is moved to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are transmissionally engaged at the different radial positions through the ball 30, and the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201 is changed.

[0072] The working principle of the second embodiment of the continuously variable transmission is specifically explained below.

[0073] Referring to Figure 3 and Figure 4 , wherein the first gear 50 is the power input end of the continuously variable transmission, the second gear 60 is the power output end of the continuously variable transmission, the first gear 50 is driven, the second transmission unit 20 is driven to rotate the second transmission arm 201, the second transmission arm 201 drives the first transmission arm 101 to rotate through the ball 30, the first transmission arm 101 drives the center rod 103 to rotate through the inner shaft sleeve 406, and then drives the first gear 50 to rotate, so that power transmission is realized. When it is necessary to change the ratio of the power input force arm and the power output force 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 move axially, so as to drive the inner shaft sleeve 406 to move axially relative to the center rod 103, and then drive the first transmission arm 101 to move axially 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 transmissionally engaged at different radial positions through the ball 30, and the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0074] Example 3

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

[0076] Referring to Figures 5 to 7 , the continuously variable transmission provided by the utility model comprises 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 center shaft, the first transmission unit 10 comprises a plurality of first transmission arms 101 which are uniformly arranged along the rotating surface of the first transmission unit 10, the first transmission arms 101 are arranged perpendicularly relative to the center shaft, the second transmission unit 20 comprises a plurality of second transmission arms 201 which are uniformly arranged along the rotating surface of the second transmission unit 20, the second transmission arms 201 are arranged perpendicularly relative to the center shaft, the second transmission arms 201 are hollow, and the first transmission arms 101 can be nested into the second transmission arms 201, such as Figure 5 and Figure 6As shown, the first transmission arm 101 and the second transmission arm 201 are arranged in parallel. Of course, the first transmission arm 101 can be hollow, and the second transmission arm 201 can be nested in the first transmission arm 101, which will not be described here. The side of the first transmission arm 101 facing the second transmission arm 201 is provided with a first sliding groove 1011, and the side of the second transmission arm 201 facing the first transmission arm 101 is provided with a second sliding groove 2011. The continuously variable transmission provided by the utility model further comprises a rolling body, for example, a ball 30, which can be arranged between the first transmission arm 101 and the second transmission arm 201, for example, the ball 30 can be arranged in the first sliding groove 1011 and the second sliding groove 2011 respectively, that is, the first transmission arm 101 and the second transmission arm 201 are drivingly connected through the ball 30.

[0077] Further, the continuously variable transmission of the utility model further comprises a diameter control unit, the ball 30 is driven by the diameter control unit to move to different radial positions along the first sliding groove 1011 and the second sliding groove 2011, so that the first transmission arm 101 and the second transmission arm 201 are drivingly connected through the rolling body at different radial positions. Specifically, referring to Figures 5 to 7 As shown, the diameter control unit comprises a threaded control rod 403, a diameter control gear 401 drivingly connected with the threaded control rod 403, a third bearing 408 threadedly connected with the threaded control rod 403, and a connecting assembly pivoted to the outer wall of the third bearing 408, the connecting assembly is connected with the rolling body, for example, the ball 30, and the non-threaded part of the threaded control rod 403 is rotatably connected with the first transmission unit 10. Combined with Figure 5 And Figure 7 As shown, the connecting assembly comprises a control rod 409 and a retainer 410, one end of the control rod 409 is pivoted to the outer wall of the third bearing 408, the other end is connected with the retainer 410, and the ball 30 is arranged in the retainer 410.

[0078] Further, as shown in Figures 5 to 7 The first transmission unit 10 further comprises a transmission arm outer shaft sleeve, the first transmission arm 101 is drivingly connected to the outer wall of the transmission arm outer shaft sleeve, and the transmission arm outer shaft sleeve is rotatably connected with the non-threaded part of the threaded control rod 403. The second transmission unit 20 further comprises a second ring 202 arranged at the end of the second transmission arm away from the threaded control rod 403.

[0079] The continuously variable transmission of the utility model further comprises 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 with the second transmission unit 20, for example, the first gear 50 is drivingly connected with the second ring 202, and the second gear 60 is drivingly connected with the first transmission unit 10 through the transmission arm outer shaft sleeve.

[0080] The continuously variable transmission of this utility model also includes a first load-bearing bearing 70 and a second load-bearing bearing 80, as shown in the reference. Figure 7 As shown, the first load-bearing bearing 70 and the second load-bearing bearing 80 are respectively installed at both 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 this utility model is explained in detail below.

[0082] Reference Figures 5 to 7 As shown, the first gear 50 serves as the power input end of the continuously variable transmission (CVT), and the second gear 60 serves as the power output end of the CVT. The first gear 50 is driven by a driving force, which drives the second transmission unit 20 to rotate the second transmission arm 201. 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 outer bushing of the transmission arm, thus 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 threaded control rod 403 to rotate. The third bearing 408 is threadedly connected to the threaded control rod 403. The rotation of the threaded control rod 403 drives the third bearing 408 to move axially. The axial movement of the third bearing 408 causes the control rod 409 to pitch relative to the third bearing 408. Through the retainer 410, the ball 30 moves along the first slide groove 1011 and the second slide groove 2011, so that the ball 30 moves to different radial positions. The first transmission arm 101 and the second transmission arm 201 are engaged in transmission 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.

[0083] Example 4

[0084] Reference Figures 8 to 10 As shown, the continuously variable transmission (CVT) of Embodiment 4 is basically the same as that of Embodiment 3, except that the CVT in Embodiment 4 includes a central rod 103, and the first transmission arm 101 and the second gear 60 are respectively connected to the central rod 103 for transmission.

[0085] Additionally, refer to Figures 8 to 10The variable-diameter control unit includes a threaded outer sleeve 405, a variable-diameter control gear 401 in transmission connection with the threaded outer sleeve 405, a fourth bearing 411 in threaded connection with the threaded outer sleeve 405, and a connecting assembly, one end of the connecting assembly being pivotally connected with an outer wall of the fourth bearing 411, and the other end being connected with the rolling body, and the central rod 103 being rotatably arranged in the threaded outer sleeve 405. The connecting assembly includes a control rod 409 and a retainer 410, one end of the control rod 409 being pivotally connected with the outer wall of the fourth bearing 411, and the other end being connected with the retainer 410, and the retainer 410 being provided with the rolling ball 30.

[0086] The working principle of the fourth embodiment of the continuously variable transmission is specifically explained below.

[0087] With reference to Figures 8 to 10 As shown in the figure, 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, the second transmission unit 20 is driven to rotate the second transmission arm 201, the second transmission arm 201 drives the first transmission arm 101 to rotate through the rolling ball 30, the first transmission arm 101 drives the first gear 50 to rotate through the central rod 103, and power transmission is realized. When it is necessary to change the ratio of the power input force arm and the power output force 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 sleeve 405 to rotate, the fourth bearing 411 is in threaded connection with the threaded outer sleeve 405, the threaded outer sleeve 405 drives the fourth bearing 411 to move axially, the fourth bearing 411 drives the control rod 409 to pitch relative to the fourth bearing 411, the rolling ball 30 is driven to move along the first sliding groove 1011 and the second sliding groove 2011 through the retainer 410, the rolling ball 30 is moved 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 rolling ball 30, and the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0088] Example 5

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

[0090] With reference to Figures 11 to 14The utility model provides a continuously variable transmission, which comprises 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 center shaft. The first transmission unit 10 comprises a plurality of first transmission arms 101 arranged uniformly along the rotating surface of the first transmission unit 10. The first transmission arms 101 are arranged obliquely relative to the center shaft. The second transmission unit 20 comprises a plurality of second transmission arms 201 arranged uniformly along the rotating surface of the second transmission unit 20. The second transmission arms 201 are arranged obliquely relative to the center shaft. The oblique 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 in 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, the first transmission arms 101 can also be hollow, and the second transmission arms 201 can be nested in the first transmission arms 101. Details are not described herein. First sliding grooves 1011 are formed on the side surfaces of the first transmission arms 101 facing the second transmission arms 201. Second sliding grooves 2011 are formed on the side surfaces of the second transmission arms 201 facing the first transmission arms 101. The continuously variable transmission provided by the utility model further comprises rolling elements, such as balls 30. The balls 30 can be arranged between the first transmission arms 101 and the second transmission arms 201, for example, the balls 30 can be arranged in the first sliding grooves 1011 and the second sliding grooves 2011 respectively, that is, the first transmission arms 101 and the second transmission arms 201 are transmissionally connected through the balls 30.

[0091] Further, the continuously variable transmission of the utility model further comprises a diameter changing control unit. The diameter changing control unit drives the balls 30 to move along the first sliding grooves 1011 and the second sliding grooves 2011, so that the balls 30 move to different radial positions, and the first transmission arms 101 and the second transmission arms 201 are transmissionally connected through the rolling elements at different radial positions. Specifically, referring to Figures 11 to 14As shown, the variable-diameter control unit comprises a threaded control rod 403, a variable-diameter control gear 401 in transmission connection with the threaded control rod 403, a fifth bearing 412 in threaded connection with the threaded control rod 403, and a variable-diameter control frame 413, one end of the variable-diameter control frame 413 being connected to the outer wall of the fifth bearing 412, the variable-diameter control frame 413 being capable of passing through the gap between the first transmission arm 101 and the second transmission arm 201, the variable-diameter control frame 413 being arranged obliquely relative to the threaded control rod 403, and the variable-diameter control frame 413 extending in the opposite direction relative to the first transmission arm 101 or the second transmission arm 201, so that the variable-diameter control frame 413 is cross-shaped 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 are capable of moving in the extension direction of the variable-diameter control frame 413, i.e. the balls 30 are capable of moving simultaneously in the variable-diameter control frame 413, the first sliding groove 1011, and the second sliding groove 2011. The non-threaded portion of the threaded control rod 403 is in rotational connection with the first transmission unit 10.

[0092] Further, as shown in Figures 11 to 14 the first transmission unit 10 further comprises a first circular ring 102 arranged at the end of the first transmission arm 101 away from the threaded control rod 403, the second transmission unit 20 further comprises a second circular ring 202 arranged at the end of the second transmission arm 201 away from the threaded control rod 403, and the second transmission unit 20 further comprises a fourth circular ring arranged at the end of the second transmission arm 201 close to the threaded control rod 403. The variable-diameter control unit further comprises a third circular ring 414 arranged at the end of the variable-diameter control frame 413 away from the threaded control rod 403.

[0093] The continuously variable transmission of the utility model further comprises 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 in transmission connection with the second transmission unit 20, for example, the first gear 50 is in transmission connection with the second circular 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 shaft sleeve, and the first transmission arm 101 and the second gear 60 are respectively connected to the outer peripheral wall of the transmission arm outer shaft sleeve.

[0094] The continuously variable transmission of the utility model further comprises a first load-bearing bearing 70 and a second load-bearing bearing 80, as shown in Figures 11 to 14 the first load-bearing bearing 70 and the second load-bearing bearing 80 are respectively arranged at the two ends of the threaded control rod 403, so as to improve the structural stability of the continuously variable transmission.

[0095] The working principle of the fifth embodiment of the continuously variable transmission of the utility model will be described in detail below.

[0096] Referring to Figures 11 to 14 As shown in the figure, the first gear 50 is the power input end of the continuously variable transmission, the second gear 60 is the power output end of the continuously variable transmission, the first gear 50 is driven, the second transmission unit 20 is driven to rotate the second transmission arm 201, 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 shaft sleeve, and power transmission is realized. When it is necessary to change the ratio of the power input force arm and the power output force 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, the fifth bearing 412 is threadedly connected with the threaded control rod 403, the threaded control rod 403 is rotated to drive the fifth bearing 412 to move axially, the fifth bearing 412 moves axially to drive the variable-diameter control frame 413 to move axially, and then the ball 30 is driven 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 transmissionally engaged at different radial positions through the ball 30, and the ratio of the power input force arm and the power output force arm between the first transmission arm 101 and the second transmission arm 201 changes.

[0097] Example 6

[0098] This embodiment is used to illustrate the sixth embodiment of the continuously variable transmission.

[0099] Referring to Figures 15 to 17As shown, the continuously variable transmission provided by the utility model 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 center shaft, the first transmission unit 10 includes a plurality of first transmission arms 101 arranged uniformly along the rotating surface of the first transmission unit 10, the first transmission arm 101 is arranged vertically relative to the center shaft, the second transmission unit 20 includes a plurality of second transmission arms 201 arranged uniformly along the rotating surface of the second transmission unit 20, the second transmission arm 201 is arranged vertically relative to the center shaft, the second transmission arm 201 is hollow, the first transmission arm 101 can be nested in the second transmission arm 201, so that the first transmission arm 101 and the second transmission arm 201 are arranged relatively parallel. Of course, the first transmission arm 101 can also be hollow, and the second transmission arm 201 can be nested in the first transmission arm 101, which will not be described here. The side of the first transmission arm 101 facing the second transmission arm 201 is provided with a first sliding groove 1011, and the side of the second transmission arm 201 facing the first transmission arm 101 is provided with a second sliding groove 2011, the continuously variable transmission provided by the utility model also includes a rolling body, for example, 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 arranged in the first sliding groove 1011 and the second sliding groove 2011 respectively, that is, the first transmission arm 101 and the second transmission arm 201 are transmissionally connected through the ball 30.

[0100] Further, the continuously variable transmission of the utility model also includes a diameter changing control unit, the ball 30 is driven by the diameter changing control unit to move along the first sliding groove 1011 and the second sliding groove 2011, so that the ball 30 moves to different radial positions, so that the first transmission arm 101 and the second transmission arm 201 are transmissionally connected through the rolling body at different radial positions. Specifically, referring to Figures 15 to 17 As shown, the diameter changing control unit includes a diameter changing control disc 415, a diameter changing control gear 401 which can be transmissionally connected with the diameter changing control disc 415, and a connecting assembly which is connected with the diameter changing control disc 415 and the rolling body respectively, the number of the diameter changing control disc 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 comprises a hollow first disc body 4151, a second disc body 4152, and a connecting piece 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 capable of meshing with the variable-diameter control gear 401, the connecting piece 4153 is formed with a hollow connecting groove, the center line of the connecting groove is arranged obliquely relative to the center lines of the first transmission arm 101 and the second transmission arm 201, one end of a connecting assembly is slidably connected in the connecting groove, and the stepless speed changer further comprises a center rod 103 rotatably connected with the first disc body 4151 and the first transmission unit 10. The connecting assembly comprises a retainer 410, one end of the retainer 410 is provided with a ball 30, and the other end is arranged in the connecting groove and is slidable along the connecting groove.

[0101] The stepless speed changer further comprises a first gear 50 and a second gear 60, one of the first gear 50 and the second gear 60 can serve as a power input end of the stepless speed changer, and the other can serve as a power output end of the stepless speed changer, 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 one end of the second transmission arm 201 away from the center rod 103, or one end of the second transmission arm 201 away from the center rod 103 is provided with a second circular ring 202, and the first gear 50 is in transmission connection with the second circular 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 shaft sleeve 105, and the first transmission arm 101 and the second gear 60 are connected to the outer peripheral wall of the transmission arm outer shaft sleeve 105.

[0102] The stepless speed changer further comprises a center rod 103, the center rod 103 is rotatably connected with the first disc body 4151, the transmission arm disc 203, and the transmission arm outer shaft sleeve 105 through a fourth support bearing 4154, a third support bearing 204, and a second support bearing 104, and one end of the transmission arm disc 203 close to the center rod is connected with the second transmission arm.

[0103] The stepless speed changer further comprises a first load bearing 70 and a second load bearing 80, as shown in Figures 15 to 17 The first load bearing 70 and the second load bearing 80 are arranged at two ends of the center rod 103, respectively, so as to improve the structural stability of the stepless speed changer.

[0104] The working principle of the sixth embodiment of the stepless speed changer will be described in detail below.

[0105] As shown in Figures 15 to 17As shown, the first gear 50 serves as the power input end of the continuously variable transmission (CVT), and the second gear 60 serves as the power output end of the CVT. The first gear 50 is driven by a driving force, which drives the second transmission unit 20 to rotate the second transmission arm 201. 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 outer bushing 105 of the transmission arm, thus 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 diameter-changing control gear 401 rotates, thereby driving the diameter-changing control disk 415 to rotate relative to the first transmission arm 101 and the second transmission arm 201, changing the diameter, so that the connecting groove rotates relative to the first transmission arm 101 and the second transmission arm 201. Since the connecting groove is inclined to the first transmission arm 101 and the second transmission arm 201, the retainer 410 is driven to move relative to the first slide groove 1011 and the second slide groove 2011 through the connecting groove, thereby driving the ball 30 to move to different radial positions, and the first transmission arm 101 and the second transmission arm 201 are engaged through the ball 30 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.

[0106] Furthermore, to facilitate the movement of the connecting slot drive retainer 410 relative to the first slide rail 1011 and the second slide rail 2011, see [link to relevant documentation]. Figures 15 to 17 As shown, the center line of the connecting groove is formed as an involute of the first disc 4151.

[0107] The preferred embodiments of this utility model have been described in detail above with reference to the accompanying drawings; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model. For example, the cross-sectional shape of the shaft of the first transmission arm and the second transmission arm can be changed to an arc shape, and various specific technical features can be combined in any suitable manner. To avoid unnecessary repetition, this utility model will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed by this utility model and all fall within the protection scope of this utility model.

Claims

1. A continuously variable transmission characterized by, The application relates to a continuously variable transmission device. The continuously variable transmission device comprises: a coaxially arranged first transmission unit (10) and a second transmission unit (20), the first transmission unit (10) comprises a first transmission arm (101), the second transmission unit (20) comprises a second transmission arm (201), the first transmission arm (101) and the second transmission arm (201) are arranged in a mutual nesting mode; a rolling body capable of abutting against the first transmission arm (101) and the second transmission arm (201) respectively; and a diameter changing control unit capable of driving the rolling body to move to different radial positions so that the first transmission arm (101) and the second transmission arm (201) are transmissionally engaged by the rolling body at different radial positions.

2. Continuously variable transmission according to claim 1, characterized in that One of the first transmission unit (10) and the second transmission unit (20) is transmissionally connected with a power input end of the continuously variable transmission, and the other is transmissionally connected with a power output end of the continuously variable transmission.

3. Continuously variable transmission according to claim 1, characterized in that The first transmission unit (10) comprises a plurality of first transmission arms (101) arranged uniformly along a rotating surface of the first transmission unit (10), the second transmission unit (20) comprises a plurality of second transmission arms (201) arranged uniformly along a rotating 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).

4. Continuously variable transmission according to claim 1, characterized in that The rolling body comprises a rolling ball (30), a first sliding groove (1011) is formed on a side of the first transmission arm (101) facing the second transmission arm (201), a second sliding groove (2011) is formed on a side of the second transmission arm (201) facing the first transmission arm (101), and the rolling ball (30) is rollingly connected in the first sliding groove (1011) and the second sliding groove (2011) respectively.

5. Continuously variable transmission according to any of claims 1-4, characterized in that, The first transmission arm (101) and the second transmission arm (201) are arranged in a mutual cross-nested mode, the diameter changing control unit is capable of driving 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 transmissionally engaged by the rolling body at different radial positions.

6. Continuously variable transmission according to claim 5, characterized in that The diameter changing control unit comprises a threaded control rod (403), a diameter changing control gear (401) transmissionally connected with the threaded control rod (403), and an axial movement assembly screwedly connected with the threaded control rod (403), the axial movement assembly is connected with the first transmission arm (101).

7. Continuously variable transmission according to claim 6, characterized in that The axial movement assembly comprises a first bearing (404) screwedly connected with the threaded control rod (403) and an outer shaft sleeve (402) sleeved outside the first bearing (404), the outer shaft sleeve (402) is connected with the first transmission arm (101).

8. Continuously variable transmission according to claim 5, characterized in that The variable-diameter control unit comprises a variable-diameter control gear (401), a threaded outer shaft sleeve (405) in threaded connection with the variable-diameter control gear (401), an inner shaft sleeve (406) sleeved on the inner side of 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 further comprises a center rod (103) capable of slidingly fitting with the inner peripheral wall of the inner shaft sleeve (406), and 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).

9. Continuously variable transmission according to claim 5, characterized in that The first transmission unit (10) further comprises a first circular 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 circular ring (202) connected to at least one end of the second transmission arm (201).

10. Continuously variable transmission according to any 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 drive the rolling body to move to different radial positions along the center line extension direction 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 transmissionally engaged by the rolling body at different radial positions.

11. Continuously variable transmission according to claim 10, characterized in that The variable-diameter control unit comprises a threaded control rod (403), a variable-diameter control gear (401) in transmission connection with the threaded control rod (403), an axial movement assembly in threaded connection with the threaded control rod (403), and a connecting assembly, one end of the connecting assembly is pivoted to the outer wall of the axial movement assembly, and the other end is connected with the rolling body, and the non-threaded portion of the threaded control rod (403) is capable of being rotationally connected with the first transmission unit (10).

12. Continuously variable transmission according to claim 11, characterized in that The axial movement assembly comprises a third bearing (408) capable of being in threaded connection with the threaded control rod (403), and the outer wall of the third bearing (408) is pivoted to the connecting assembly.

13. Continuously variable transmission according to claim 10, characterized in that The variable-diameter control unit comprises a threaded outer shaft sleeve (405), a variable-diameter control gear (401) in transmission connection with the threaded outer shaft sleeve (405), an axial movement assembly in threaded connection with the threaded outer shaft sleeve (405), and a connecting assembly, one end of the connecting assembly is pivoted to the outer wall of the axial movement assembly, and the other end is connected with the rolling body, and the first transmission unit (10) comprises a center rod (103) connected with the first transmission arm (101), and the center rod (103) is capable of being rotationally arranged in the threaded outer shaft sleeve (405).

14. Continuously variable transmission according to claim 13, characterized in that The axial movement assembly comprises a fourth bearing (411) capable of being in threaded connection with the threaded outer shaft sleeve (405), and the outer wall of the fourth bearing (411) is pivoted to the connecting assembly.

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

16. Continuously variable transmission according to claim 10, characterized in that The variable-diameter control unit comprises a threaded control rod (403), a variable-diameter control gear (401) in transmission connection with the threaded control rod (403), an axial movement assembly in threaded connection with the threaded control rod (403), and a variable-diameter control frame (413), one end of the variable-diameter control frame (413) being connected to the outer wall of the axial movement assembly, the variable-diameter control frame (413) being capable of passing through the gap between the first transmission arm (101) and the second transmission arm (201), the rolling body being embedded in the variable-diameter control frame (413) and being capable of moving along the extension direction of the variable-diameter control frame (413), and the non-threaded part of the threaded control rod (403) being capable of being in rotational connection with the first transmission unit (10).

17. Continuously variable transmission according to claim 16, characterized in that The axial movement assembly comprises a fifth bearing (412) capable of being in threaded connection with the threaded control rod (403), and the outer wall of the fifth bearing (412) is connected with the variable-diameter control frame (413).

18. Continuously variable transmission according to claim 16, characterized in that The first transmission unit (10) further comprises a first circular 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 circular ring (202) connected to at least one end of the second transmission arm (201); and / or, The continuously variable transmission further comprises a third circular ring (414) connected to one end of the variable-diameter control frame (413) away from the axial movement assembly.

19. Continuously variable transmission according to claim 10, characterized in that The variable-diameter control unit comprises a variable-diameter control disc (415), a variable-diameter control gear (401) capable of being in transmission connection with the variable-diameter control disc (415), and a connecting assembly respectively connected with the variable-diameter control disc (415) and the rolling body, the variable-diameter control disc (415) being arranged 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) comprising a hollow first disc body (4151), a second disc body (4152), and a connecting piece (4153) connected between the first disc body (4151) and the second disc body (4152), the outer edge of the second disc body (4152) being formed with teeth capable of being in meshing connection with the variable-diameter control gear (401), the connecting piece (4153) being formed with a hollow connecting groove, the center line of the connecting groove being arranged obliquely relative to the center lines of the first transmission arm (101) and the second transmission arm (201), one end of the connecting assembly being capable of being in sliding connection in the connecting groove, and the continuously variable transmission further comprises a center rod (103) in rotational connection with the first disc body (4151) and the first transmission unit (10) respectively.

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

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