CVT gearbox

Abstract

The utility model discloses a CVT (continuously variable transmission) gearbox, which is applied to a riding type mower and comprises a gearbox, a transmission shaft and a transmission shaft, the transmission wheel set is mounted on the gear box and serves as a power input component; the driven wheel set is mounted on the gearbox, and the driven wheel set and the transmission wheel set are driven by a transmission belt; the output shaft is arranged in the gearbox, at least one end of the output shaft protrudes out of the gearbox, the output shaft is used as a power output component, and the output shaft is in transmission connection with the driven wheel set in the gearbox; moreover, the transmission wheel set and the driven wheel set are arranged on the same side of the output shaft, and an acute angle is formed between a straight line formed by connecting the axis of the transmission wheel set and the axis of the driven wheel set and the axis of the output shaft in the overlooking view angle. According to the technical scheme, the gearbox can be simultaneously adaptive to different styles of riding type mowers in Europe and America, the adaptability is wider, and therefore a large amount of production and design cost can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of CVT gearboxes, in particular to a CVT gearbox. Background Art

[0002] A CVT gearbox is usually set in a riding lawn mower to meet its speed regulation and reversing functions. The current CVT gearbox usually includes a gearbox, a driving wheel set and a driven wheel set connected by a pulley transmission, and the gearbox has a gear output shaft. In the current design, the axis line connecting the driving wheel set and the driven wheel set is generally perpendicular to the axis of the gear output shaft, and in a top view, the driving wheel set and the driven wheel set are distributed on both sides of the axis of the gear output shaft.

[0003] In actual use and sales, there are great differences in the usage habits of users in different countries. For example, American users are accustomed to using lawn mowers with grass collecting frames. The grass collecting frame is arranged on the side of the gear box adjacent to the transmission wheel set. Based on the position design between the transmission wheel set and the gear output shaft under the current structure, the grass collecting frame will conflict with the transmission wheel set. For another example, European users do not often use grass collecting frames, but have high requirements for the size of the space on the front side of the CVT gearbox, that is, they need to meet the overall width of the gearbox to be limited to a certain size. In the existing structure, the axis line connecting the transmission wheel set and the driven wheel set is generally perpendicular to the axis of the gear output shaft, making the overall width larger. On the other hand, in the current gearbox, the speed regulation and reversing structure designed is relatively cumbersome and not easy to maintain. Users expect to have a simpler structure to achieve its function. Utility Model Content

[0004] In view of the above problems existing in the prior art, a CVT transmission is now provided to overcome at least one of the above technical defects.

[0005] The specific technical solutions are as follows:

[0006] A CVT gearbox is applied to a riding lawn mower, wherein the CVT gearbox comprises:

[0007] Gearbox;

[0008] The transmission wheel set is installed on the gear box and serves as a power input component;

[0009] The driven wheel set is installed on the gear box, and the driven wheel set and the driving wheel set are driven by a transmission belt;

[0010] An output shaft is disposed in the gear box and at least one end of which protrudes out of the gear box, and is used as a power output component. The output shaft is partially connected to the driven wheel set in the gear box;

[0011] Furthermore, the driving wheel set and the driven wheel set are arranged on the same side of the output shaft, and in a top view, an acute angle is formed between a straight line connecting the axis of the driving wheel set and the axis of the driven wheel set and the axis of the output shaft.

[0012] Preferably, the acute angle is not less than 10° and not more than 60°.

[0013] Preferably, the transmission wheel set comprises:

[0014] transmission shaft;

[0015] The transmission wheel is connected to the transmission shaft and serves as a power input component;

[0016] The upper speed regulating plate is mounted on the transmission shaft;

[0017] The lower speed regulating disc is rotatably connected to the transmission shaft and can move axially along the transmission shaft, so as to form an installation interval with adjustable spacing between the upper speed regulating disc and the lower speed regulating disc for matching the transmission belt. A connecting column is also extended to form an end of the lower speed regulating disc away from the upper speed regulating disc;

[0018] The sliding plate is sleeved on the connecting column through a bearing, and a radial limiting structure is formed between the sliding plate and the gear box to limit the sliding plate from rotating around the axis of the transmission shaft and allow the sliding plate to move around the axis of the transmission shaft;

[0019] The rotating plate is rotatably connected to the transmission shaft and is located below the sliding plate. A rotating lifting structure is formed between the rotating plate and the sliding plate to convert the circumferential rotation of the rotating plate into a linear motion of the sliding plate along the axis of the transmission shaft, thereby causing the lower speed regulating plate to move in a direction close to the upper speed regulating plate.

[0020] At least one elastic component is disposed between the gear box and the rotating disk, and is used to cause the rotating disk and the lower speed regulating disk to move away from the upper speed regulating disk.

[0021] Preferably, the end of the rotating disk facing the sliding disk is formed with two arc-shaped grooves which are larger at the top and smaller at the bottom, and the end of the sliding disk facing the rotating disk is formed with arc-shaped blocks which are equal in number and have shapes matching the arc-shaped grooves. The arc-shaped grooves and the arc-shaped blocks together constitute a rotating lifting structure for converting the circumferential rotational motion of the rotating disk into the longitudinal lifting motion of the sliding disk.

[0022] Preferably, it further comprises a steering mechanism, the lower end of the driven wheel set has a linkage gear, and the steering mechanism comprises:

[0023] Rotating shaft;

[0024] The sliding sleeve is mounted on the rotating shaft and can move along the axis direction of the rotating shaft and rotate synchronously with the rotating shaft;

[0025] Two reversing gears are arranged opposite to each other, at least one of which is mounted on the sliding sleeve, and the linkage gear is at least partially located between the two reversing gears and meshes with the two reversing gears at the same time;

[0026] The meshing wheel is sleeved on the outer circumference of the sliding sleeve and is located between the two reversing gears, and a detachable meshing structure is formed between the two sides of the meshing wheel and the reversing gears;

[0027] The displacement assembly is transmission-connected to the sliding sleeve, and is used to drive the sliding sleeve and the meshing wheel to move synchronously along the axial direction of the rotating shaft, and to enable the meshing wheel to have a first position state in which it is meshed and connected to one of the reversing gears, a second position state in which it is meshed and connected to the other reversing gear, and a third position state in which it is not meshed with the two reversing gears.

[0028] Preferably, the displacement assembly comprises:

[0029] Rocker arm, transmission connecting sleeve;

[0030] A pull pin, one end of which is hinged to the rocker arm, and the other end of which is detachably radially plugged with a protruding column;

[0031] A rotating sleeve is sleeved on the other end of the pull pin, and the outer circumference of the rotating sleeve has a spiral groove, and the convex column is arranged in the spiral groove and can move along the spiral groove;

[0032] The shift handle has one end connected to the rotating sleeve to drive the rotating sleeve to rotate circumferentially, and drives the pull pin and the rocker arm to move along the axial direction of the rotating sleeve through the matching spiral groove and the convex column, and the axial direction of the rotating sleeve is parallel to the axial direction of the rotating shaft.

[0033] Preferably, the rocker arm is in a "C" shape as a whole, the outer periphery of the sliding sleeve is formed with an annular groove, the inner side of the rocker arm has two mirror-arranged rod portions, and the rod portions are placed in the annular groove, the outer side of the rocker arm has a radially extending connecting rod, and one end of the pull pin has a through hole for inserting the connecting rod.

[0034] Preferably, the rocker arm is in a "C" shape as a whole, the outer periphery of the sliding sleeve is formed with an annular groove, the inner side of the rocker arm has two mirror-arranged rod portions, and the rod portions are placed in the annular groove, a plate-like connecting portion is extended on the outer side of the rocker arm, and one end of the pull pin is hinged to the connecting portion through a pin shaft.

[0035] Preferably, the end surfaces of the two reversing gears facing the meshing wheel are both formed with first gear teeth, and the two sides of the meshing wheel are respectively formed with second gear teeth meshing with the first gear teeth, and the first gear teeth and the second gear teeth together form a separable meshing structure.

[0036] Preferably, it also includes a speed regulating mechanism, which includes a pull rod and a speed regulating pull plate that are hinged to each other, and the end of the pull rod that is away from the speed regulating pull plate is hinged to the rotating disk, and when the meshing wheel is in the second position, an interlocking structure is formed between the speed regulating pull plate and the shift handle to limit the maximum stroke of the speed regulating pull plate.

[0037] The beneficial effects of the above technical solution are:

[0038] (1) The CVT transmission includes a gearbox, a driving wheel set, a driven wheel set, a transmission belt, and an output shaft, and the driving wheel set and the driven wheel set are arranged on the same side of the output shaft, so that a position for arranging a grass collecting frame can be reserved on the side of the output shaft away from the driving wheel set, so as to be suitable for riding lawn mowers that American users are accustomed to using, and an acute angle is formed between a straight line formed by connecting the axes of the driving wheel set and the driven wheel set and an axial line of the output shaft, so that the overall width of the driving wheel is smaller, and the spacing between the driven wheel set and the output shaft is suitable for riding lawn mowers that European users are accustomed to using, so that the transmission can be simultaneously adapted to riding lawn mowers of different styles in Europe and the United States, with a wider adaptability, thereby saving a lot of production and design costs.

[0039] (2) The pushing action between the sliding disk and the rotating disk and the restoring action of the elastic component can cause the distance between the two speed regulating disks to be scaled, and the installation interval formed between the two speed regulating disks is a conventional structure that gradually increases from the inside to the outside, so that the corresponding transmission belts are tightened or relaxed, thereby realizing the speed shifting function of the movable tooth continuously variable speed change structure. In this scheme, the connection transmission relationship between the lower speed regulating disk, the sliding disk, and the rotating disk is optimized, making the transmission method smoother and the overall structure more concise. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a top view of the CVT gearbox of the utility model;

[0041] Figure 2 It is a three-dimensional diagram of the CVT gearbox of the utility model;

[0042] Figure 3 It is an exploded view of the transmission wheel set in the CVT gearbox of the utility model;

[0043] Figure 4 It is an exploded view of the driven wheel set in the CVT gearbox of the utility model;

[0044] Figure 5 It is an assembly diagram of the driving wheel set, the driven wheel set, the speed regulating mechanism and the steering mechanism in the CVT gearbox of the utility model;

[0045] Figure 6 It is an exploded diagram of the steering mechanism in the CVT gearbox of the utility model;

[0046] Figure 7 It is an assembly diagram of the steering mechanism and the speed regulating pull plate in the CVT gearbox of the utility model;

[0047] Figure 8 It is a three-dimensional diagram of the shift handle and speed adjustment pull plate in the CVT gearbox of the utility model;

[0048] Fig. 9 It is an assembly diagram of a driving wheel set, a driven wheel set, a speed regulating mechanism and a steering mechanism in another embodiment of the CVT gearbox of the utility model;

[0049] Fig.10 An exploded view of a steering mechanism in another embodiment of a CVT transmission of the present utility model;

[0050] Fig.11 This is an assembly diagram of a steering mechanism and a speed regulating pull plate in another embodiment of a CVT transmission of the utility model. DETAILED DESCRIPTION

[0051] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is specifically described in the following embodiments in conjunction with the accompanying drawings.

[0052] Embodiment 1,

[0053] See also Figures 1 to 8 As shown in , the CVT gearbox provided in this embodiment is applied to a riding lawn mower, and the CVT gearbox includes:

[0054] Gear box 1;

[0055] The transmission wheel set 3 is mounted on the gear box 1 and serves as a power input component;

[0056] The driven wheel set 4 is mounted on the gear box 1, and the driven wheel set 4 and the driving wheel set 3 are driven by a driving belt 6;

[0057] An output shaft 2 is disposed in the gear box 1 and at least one end of which protrudes out of the gear box 1, and is used as a power output component. The output shaft 2 is partially connected to the driven wheel set 4 in the gear box 1;

[0058] Furthermore, the driving wheel set 3 and the driven wheel set 4 are arranged on the same side of the output shaft 2 , and in a top view, an acute angle a is formed between a straight line connecting the axis of the driving wheel set 3 and the axis of the driven wheel set 4 and the axis of the output shaft 2 .

[0059] Based on the above technical solution, the CVT gearbox includes a gearbox 1, a driving wheel group 3, a driven wheel group 4, a transmission belt 6, and an output shaft 2, and the driving wheel group 3 and the driven wheel group 4 are arranged on the same side of the output shaft 2, so that a position for configuring a grass collecting frame 5 can be reserved on the side of the output shaft 2 away from the driving wheel group 3, so as to adapt to the riding lawn mowers that American users are accustomed to using, and an acute angle is formed between the straight line formed by connecting the axes of the driving wheel group 3 and the driven wheel group 4 and the axis straight line of the output shaft 2, so that the overall width of the driving wheel is smaller, and the distance between the driven wheel group 4 and the output shaft 2 is adapted to the riding lawn mowers that European users are accustomed to using, so that the present gearbox can be adapted to different styles of riding lawn mowers in Europe and the United States at the same time, with a wider adaptability, thereby saving a lot of production and design costs.

[0060] In a preferred embodiment, specifically as Figure 1 and Figure 2 As shown in , the acute angle a is not less than 10° and not more than 60°, and its adaptability is stronger. In specific applications, the driving wheel set 3, the driven wheel set 4, and the driving belt 6 together form a movable tooth stepless mechanism to achieve a stepless speed change function.

[0061] In a preferred embodiment, specifically as Figures 2 to 5 As shown in , the transmission wheel set 3 includes:

[0062] Transmission shaft 34;

[0063] The transmission wheel 31 is transmission-connected to the transmission shaft 34 and serves as a power input component;

[0064] The upper speed regulating disc 32 is mounted on the transmission shaft 34;

[0065] The lower speed regulating plate 33 is rotatably connected to the transmission shaft 34 and can move axially along the transmission shaft 34, so that the upper speed regulating plate 32 and the lower speed regulating plate 33 form an installation interval with adjustable spacing for matching the transmission belt 6. The end of the lower speed regulating plate 33 away from the upper speed regulating plate 32 is also extended to form a connecting column 38;

[0066] The sliding plate 35 is mounted on the connecting column 38 through a bearing sleeve, and a radial limiting structure is formed between the sliding plate 35 and the gear box 1 to limit the sliding plate 35 from rotating around the axis of the transmission shaft 34 and allow the sliding plate 35 to move around the axis of the transmission shaft 34;

[0067] The rotating disk 36 is rotatably connected to the transmission shaft 34 and is located below the sliding disk 35. A rotating lifting structure is formed between the rotating disk 36 and the sliding disk 35 to convert the circumferential rotation of the rotating disk 36 into a linear motion of the sliding disk 35 along the axis of the transmission shaft 34, thereby causing the lower speed regulating disk 33 to move in a direction close to the upper speed regulating disk 32.

[0068] At least one elastic member 37 is disposed between the gear box 1 and the rotating disk 36 to enable the rotating disk 36 and the lower speed regulating disk 33 to move away from the upper speed regulating disk 32 .

[0069] Based on the above technical scheme, the distance between the two speed regulating disks can be scaled through the pushing action between the sliding disk 35 and the rotating disk 36 and the resetting action of the elastic component 37, and the installation interval formed between the two speed regulating disks is a conventional structure that gradually increases from the inside to the outside, so that the corresponding transmission belt 6 is tightened or relaxed, thereby realizing the speed shifting function of the movable tooth stepless speed change structure, and in this scheme, the connection transmission relationship between the lower speed regulating disk 33, the sliding disk 35, and the rotating disk 36 is optimized, so that the transmission method is smoother and the overall structure is simpler.

[0070] As a further preferred embodiment, the end of the rotating disk 36 facing the sliding disk 35 is formed with two arc-shaped grooves 361 that are larger at the top and smaller at the bottom, and the end of the sliding disk 35 facing the rotating disk 36 is formed with arc-shaped blocks of the same number and shape as the arc-shaped grooves 361, and the arc-shaped grooves 361 and the arc-shaped blocks together constitute the above-mentioned rotating lifting structure, which is used to convert the circumferential rotation of the rotating disk 36 into the longitudinal lifting of the sliding disk 35. Further, the outer periphery of the sliding disk 35 is formed with at least two ear seats, and the ear seats are connected to the gear box 1 through fasteners, and the ear seats are allowed to move longitudinally, thereby forming a radial limiting structure. Further, the fastener is a screw rod, and the elastic member 37 is a compression spring and is sleeved on the screw rod to achieve the above-mentioned radial limiting and elastic reset functions.

[0071] In a preferred embodiment, in combination Figures 4 to 7 As shown in , the CVT gearbox also includes a steering mechanism 7, the lower end of the driven wheel set 4 has a linkage gear 41, and the steering mechanism 7 includes:

[0072] Rotating shaft 71;

[0073] The sliding sleeve 73 is sleeved on the rotating shaft 71 and can move along the axis direction of the rotating shaft 71 and rotate synchronously with the rotating shaft 71;

[0074] Two reversing gears 72 are arranged opposite to each other, at least one of which is mounted on the sliding sleeve 73, and the linkage gear 41 is at least partially located between the two reversing gears 72 and meshes with the two reversing gears 72 at the same time;

[0075] The meshing wheel 74 is sleeved on the outer circumference of the sliding sleeve 73 and is located between the two reversing gears 72, and a detachable meshing structure is formed between the two sides of the meshing wheel 74 and the reversing gears 72;

[0076] The displacement assembly is transmission-connected to the sleeve 73 to drive the sleeve 73 and the meshing wheel 74 to move synchronously along the axial direction of the rotating shaft 71, and enables the meshing wheel 74 to have a first position state in which it is meshed and connected to one of the reversing gears 72, a second position state in which it is meshed and connected to the other reversing gear 72, and a third position state in which it is not meshed with the two reversing gears 72.

[0077] In a specific application, the two reversing gears 72 are divided into a first reversing gear 72 and a second reversing gear 72 arranged front to back. The meshing wheel 74 is meshed with the first reversing gear 72 in the first position state, so that the output of the gearbox 1 is a forward gear. The meshing wheel 74 is meshed with the second reversing gear 72 in the second position state, so that the output of the gearbox 1 is a reverse gear. The meshing wheel 74 is in the third position state, so that the output of the gearbox 1 is a neutral gear.

[0078] As a further preferred embodiment, the displacement assembly comprises:

[0079] The rocker arm 75 is connected to the sliding sleeve 73;

[0080] The pull pin 76 has one end hinged to the rocker arm 75 and the other end is detachably radially plugged with a protruding column;

[0081] The rotating sleeve 77 is sleeved on the other end of the pull pin 76, and the outer periphery of the rotating sleeve 77 has a spiral groove 771, and the protruding column is disposed in the spiral groove 771 and can move along the spiral groove 771;

[0082] The shift handle 78 is connected to the rotating sleeve 77 at one end to drive the rotating sleeve 77 to rotate in the circumferential direction, and drives the pull pin 76 and the rocker arm 75 to move along the axial direction of the rotating sleeve 77 through the matching spiral groove 771 and the protruding column, and the axial direction of the rotating sleeve 77 is parallel to the axial direction of the rotating shaft 71. Thus, the aforementioned reversing function is realized, but it can obviously also be realized by directly dragging the sliding sleeve 73, etc., and is not limited to this.

[0083] As a further preferred embodiment, Figure 6 As shown in the figure, the rocker arm 75 is in a "C" shape as a whole, and an annular groove 731 is formed on the outer periphery of the sliding sleeve 73. The inner side of the rocker arm 75 has two mirror-arranged rod portions 752, and the rod portions 752 are placed in the annular groove 731. The outer side of the rocker arm 75 has a radially extending connecting rod 751, and one end of the pull pin 76 has a through hole 761 for inserting the connecting rod 751.

[0084] As a further preferred embodiment, the two reversing gears 72 are both provided with first gear teeth 721 on their end faces facing the meshing wheel 74, and the two sides of the meshing wheel 74 are respectively provided with second gear teeth 741 meshing with the first gear teeth 721, and the first gear teeth 721 and the second gear teeth 741 together constitute a detachable meshing structure, but it can also be achieved by a slot and block structure with matching shape, and is not limited to this.

[0085] In a preferred embodiment, in combination Figure 5 , Figure 7 as well as Figure 8 As shown in , the CVT transmission also includes a speed regulating mechanism 8, which includes a hinged pull rod 81 and a speed regulating pull plate 82, and the end of the pull rod 81 away from the speed regulating pull plate 82 is hinged to the rotating disk 36, and when the meshing wheel 74 is in the second position state, an interlocking structure is formed between the speed regulating pull plate 82 and the shift handle 78 to limit the maximum stroke of the speed regulating pull plate 82. That is, when the output of the gear box 1 is the reverse gear, the maximum stroke of the speed regulating pull plate 82 is limited by the shift handle 78 to limit the reverse gear speed.

[0086] Specifically, the speed regulating mechanism 8 causes the rotating disk 36 to move in a circumferential direction by pulling the pull rod 81, and the rotating disk 36 contacts the sliding disk 35 through the inclined plane drop generated by the rotating lifting structure, so that the sliding disk 35 moves upward and drives the lower speed regulating disk 33 to move upward, and the transmission belt 6 is squeezed toward the outer ring of the two speed regulating disks, so as to change the speed difference between the two speed regulating disks and the transmission belt 6 and achieve the purpose of acceleration. When the meshing wheel 74 is in the first position state, it is a forward gear, and the gear shifting handle 78 is at a position far away from the speed regulating pull plate 82, and will not limit the travel of the speed regulating pull plate 82. When the meshing wheel 74 is in the second position state, it is a reverse gear, and the gear shifting handle 78 is at a position adjacent to the speed regulating pull plate 82 and is on the moving path of the speed regulating pull plate 82. When the lower plane of the speed regulating pull plate 82 presses the gear shifting handle 78, the purpose of travel limiting is achieved, that is, the above-mentioned interlocking structure.

[0087] In addition, the aforementioned components are generally installed in or on the gear box 1, which is a conventional design, so the description is omitted here. In addition, the overall structure of the driven wheel set 4 is basically consistent with the existing solution, mainly including two rotating disks 42 with adjustable spacing, a driven shaft 43 and a linkage gear 41, so that the driven wheel set 4, the transmission wheel set 3 and the transmission belt 6 together form a movable tooth stepless structure, so the description is omitted here.

[0088] Embodiment 2:

[0089] Combination Figures 9 to 11As shown in , the CVT gearbox provided in this embodiment is basically the same as the above-mentioned embodiment 1, except that the rocker arm 75 in this embodiment is in a "C" shape as a whole, the outer periphery of the sliding sleeve 73 is formed with an annular groove 731, the inner side of the rocker arm 75 has two mirror-disposed rods 752, and the rods 752 are placed in the annular groove 731, the outer side of the rocker arm 75 extends to form a plate-shaped connecting portion 753, and one end of the pull pin 76 is hinged to the connecting portion 753 through a pin shaft. The technical effects it has are the same as those above, so it is omitted here.

[0090] The above is only a preferred embodiment of the utility model, which is only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences can be made within the spirit and scope defined by the claims of the utility model, but they will all fall within the scope of protection of the utility model.

Claims

1. A CVT gearbox, used in a riding lawn mower, characterized in that: The CVT gearbox comprises: Gear box (1); A transmission wheel set (3), mounted on the gear box (1) and serving as a power input component; A driven wheel set (4) is mounted on the gear box (1), and the driven wheel set (4) and the driving wheel set (3) are driven by a driving belt (6); An output shaft (2) is arranged in the gear box (1) and at least one end of which protrudes outside the gear box (1), and is used as a power output component. The output shaft (2) is partially transmission-connected to the driven wheel set (4) in the gear box (1); Furthermore, the transmission wheel set (3) and the driven wheel set (4) are arranged on the same side of the output shaft (2), and in a top view, a straight line formed by connecting the axis of the transmission wheel set (3) and the axis of the driven wheel set (4) forms an acute angle a with the axis of the output shaft (2).

2. The CVT transmission according to claim 1, characterized in that: The acute angle a is not less than 10° and not more than 60°.

3. The CVT transmission according to claim 1, characterized in that: The transmission wheel set (3) comprises: Transmission shaft (34); A transmission wheel (31) is transmission-connected to the transmission shaft (34) and serves as a power input component; An upper speed regulating disc (32) is sleeved on the transmission shaft (34); The lower speed regulating plate (33) is rotatably connected to the transmission shaft (34) and can move axially along the transmission shaft (34) so ​​as to form an installation interval with adjustable spacing between the upper speed regulating plate (32) and the lower speed regulating plate (33) for matching the transmission belt (6). The end of the lower speed regulating plate (33) away from the upper speed regulating plate (32) is also extended to form a connecting column (38); A sliding plate (35) is sleeved on the connecting column (38) via a bearing, and a radial limiting structure is formed between the sliding plate (35) and the gear box (1) to limit the sliding plate (35) from rotating around the axis of the transmission shaft (34) and to allow the sliding plate (35) to move around the axis of the transmission shaft (34); A rotating disk (36) is rotatably connected to the transmission shaft (34) and is located below the sliding disk (35), and a rotating lifting structure is formed between the rotating disk (36) and the sliding disk (35) for converting the circumferential rotation of the rotating disk (36) into a linear motion of the sliding disk (35) along the axis of the transmission shaft (34), thereby causing the lower speed regulating disk (33) to move in a direction close to the upper speed regulating disk (32); At least one elastic component (37) is disposed between the gear box (1) and the rotating disk (36) to cause the rotating disk (36) and the lower speed regulating disk (33) to move away from the upper speed regulating disk (32).

4. The CVT transmission according to claim 3, characterized in that: The end of the rotating disk (36) facing the sliding disk (35) is formed with two arc-shaped grooves (361) which are larger at the top and smaller at the bottom. The end of the sliding disk (35) facing the rotating disk (36) is formed with arc-shaped blocks which are equal in number and have shapes matching the arc-shaped grooves (361). The arc-shaped grooves (361) and the arc-shaped blocks together constitute the rotating lifting structure for converting the circumferential rotation of the rotating disk (36) into the longitudinal lifting of the sliding disk (35).

5. The CVT transmission according to claim 4, characterized in that: It also includes a steering mechanism (7), wherein the lower end of the driven wheel group (4) has a linkage gear (41), and the steering mechanism (7) includes: A rotating shaft (71); A sliding sleeve (73) is sleeved on the rotating shaft (71) and is movable along the axis direction of the rotating shaft (71) and is synchronously rotated with the rotating shaft (71); Two reversing gears (72) arranged opposite to each other, at least one of which is sleeved on the sliding sleeve (73), and the linkage gear (41) is at least partially located between the two reversing gears (72) and is simultaneously meshed with the two reversing gears (72); A meshing wheel (74) is sleeved on the outer periphery of the sliding sleeve (73) and is located between the two reversing gears (72), and a detachable meshing structure is formed between the two sides of the meshing wheel (74) and the reversing gears (72); A displacement assembly is transmission-connected to the sliding sleeve (73) to drive the sliding sleeve (73) and the meshing wheel (74) to move synchronously along the axial direction of the rotating shaft (71), and to enable the meshing wheel (74) to have a first position state in which it is meshed with one of the reversing gears (72), a second position state in which it is meshed with the other reversing gear (72), and a third position state in which it is not meshed with the two reversing gears (72).

6. The CVT transmission according to claim 5, characterized in that: The displacement assembly comprises: A rocker arm (75) drivingly connected to the sliding sleeve (73); A pull pin (76) has one end hinged to the rocker arm (75) and the other end of which is detachably radially plugged with a protruding column; A rotating sleeve (77) is sleeved on the other end of the pull pin (76), and the outer periphery of the rotating sleeve (77) has a spiral groove (771), and the protruding column is arranged in the spiral groove (771) and can move along the spiral groove (771); The gear shift handle (78) has one end connected to the rotating sleeve (77) for driving the rotating sleeve (77) to rotate in the circumferential direction, and drives the pull pin (76) and the rocker arm (75) to move along the axial direction of the rotating sleeve (77) through the matching spiral groove (771) and the protruding column, and the axial direction of the rotating sleeve (77) is parallel to the axial direction of the rotating shaft (71).

7. The CVT transmission according to claim 6, characterized in that: The rocker arm (75) is in a "C" shape as a whole. The outer periphery of the sliding sleeve (73) is formed with an annular groove (731). The inner side of the rocker arm (75) has two mirror-image-arranged rod portions (752), and the rod portions (752) are placed in the annular groove (731). The outer side of the rocker arm (75) has a radially extending connecting rod (751), and one end of the pull pin (76) has a through hole (761) for inserting the connecting rod (751).

8. The CVT transmission according to claim 6, characterized in that: The rocker arm (75) is in a "C" shape as a whole. The outer periphery of the sliding sleeve (73) is formed with an annular groove (731). The inner side of the rocker arm (75) has two mirror-image-arranged rod portions (752), and the rod portions (752) are placed in the annular groove (731). The outer side of the rocker arm (75) is extended to form a plate-shaped connecting portion (753), and one end of the pull pin (76) is hinged to the connecting portion (753) through a pin shaft.

9. The CVT transmission according to claim 7 or 8, characterized in that: The end surfaces of the two reversing gears (72) facing the meshing wheel (74) are each formed with a first gear tooth (721), and the two sides of the meshing wheel (74) are respectively formed with a second gear tooth (741) meshing with the first gear tooth (721), and the first gear tooth (721) and the second gear tooth (741) together form the detachable meshing structure.

10. The CVT transmission according to claim 9, characterized in that: The invention also includes a speed regulating mechanism (8), wherein the speed regulating mechanism (8) includes a pull rod (81) and a speed regulating pull plate (82) which are hinged to each other, and one end of the pull rod (81) which is away from the speed regulating pull plate (82) is hinged to the rotating disk (36), and when the meshing wheel (74) is in the second position state, an interlocking structure is formed between the speed regulating pull plate (82) and the shift handle (78) to limit the maximum stroke of the speed regulating pull plate (82).

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