CN217694430U - Stepless speed change mechanism and mower - Google Patents

Abstract

The application relates to a continuously variable transmission mechanism, comprising: the driving belt wheel assembly comprises a driving shaft, a first driving belt wheel and a second driving belt wheel, wherein a first belt wheel groove which is variable in width and gradually expands along the direction far away from the driving shaft is formed between the first driving belt wheel and the second driving belt wheel; the driven pulley assembly comprises a driven shaft, a first driven pulley and a second driven pulley, the driven shaft is rotatably connected to the bridge body, and a second pulley groove which is variable in width and gradually expands along the direction far away from the driven shaft is formed between the first driven pulley and the second driven pulley; the speed changing belt is in transmission connection with the first pulley groove and the second pulley groove; the speed regulating assembly is used for driving the first driving belt wheel or the second driving belt wheel to move along the driving shaft; the first elastic piece is used for driving the width of the second belt wheel groove to be reduced. So set up, can realize the variable speed operation through adjusting the speed governing subassembly, convenient and fast just shifts and stablely do not block to the speed governing that makes to ride and take advantage of lawn mower is smooth-going stable.

Description

Stepless speed change mechanism and mower

Technical Field

The application relates to the technical field of transmission devices, in particular to a stepless speed change mechanism and a mower.

Background

Riding lawn mowers, also known as riding lawn mowers, are mechanical tools used for trimming lawns and vegetation, and have wide application in real life. The application of the mower not only saves a large amount of manual time, but also enables the lawn to be more beautiful after being trimmed, and is a very practical mechanical tool.

In the prior art, the gears of the riding mower are arranged less, generally only two gears of forward and backward are needed, the speed is regulated through an accelerator, the loss of power energy is large, or the speed is regulated through another trigger, the operation is complex, and the gear shifting is blocked.

SUMMERY OF THE UTILITY MODEL

For overcoming the problem that exists among the correlation technique at least to a certain extent, the aim at of this application provides a infinitely variable speed mechanism, and it can solve current riding mower's gear setting less, generally only goes forward and two gears that retreat, and the loss of the power energy is great during the speed governing, complex operation, the card problem of shifting. The following description is provided to further describe various technical effects that can be produced by the preferred technical solutions among the technical solutions provided by the present application.

The application provides a continuously variable transmission mechanism, includes:

the driving pulley assembly comprises a driving shaft, a first driving pulley and a second driving pulley, the driving shaft is rotatably connected to a bridge body, the first driving pulley and the second driving pulley are coaxially and synchronously and rotatably connected to the driving shaft, the first driving pulley or the second driving pulley can move along the driving shaft, and a first pulley groove which is variable in width and gradually expands in a direction far away from the driving shaft is formed between the first driving pulley and the second driving pulley;

a driven pulley assembly including a driven shaft rotatably connected to the axle body, a first driven pulley and a second driven pulley coaxially and synchronously rotatably connected to the driven shaft, the first driven pulley or the second driven pulley being displaceable along the driven shaft and forming a variable-width second pulley groove between the first driven pulley and the second driven pulley that gradually expands in a direction away from the driven shaft;

the speed changing belt is in transmission connection with the first pulley groove and the second pulley groove;

the speed regulating assembly is used for driving the first driving belt wheel or the second driving belt wheel to move close to the driving shaft along the axial direction of the driving shaft;

and the first elastic part is used for driving the first driven belt wheel or the second driven belt wheel to move close to the driven shaft along the axial direction of the driven shaft so as to drive the width of the second belt wheel groove to be reduced.

Preferably, the first driving pulley is close to the axle body relative to the second driving pulley, the first driving pulley is displaceable along the driving shaft, and the governor assembly is disposed between the axle body and the first driving pulley, and the second driving pulley is fixed relative to the driving shaft.

Preferably, the governor assembly comprises:

the sliding block is coaxially sleeved outside the driving shaft and is rotatably connected with the first driving belt wheel;

the jacking block is coaxially sleeved outside the driving shaft and is connected with the bridge body; the sliding block is matched with the jacking block through an inclined plane structure;

and the control structure is used for driving the sliding block and the ejector block to rotate relatively so as to drive the sliding block and the first driving belt wheel to move along the driving shaft through the inclined surface structure.

Preferably, the manipulation structure comprises:

the rotating block is rotatably connected to the bridge body;

and one end of the pull rod is connected to the swinging end of the rotating block, and the other end of the pull rod is connected to the periphery of the sliding block.

Preferably, the slope structure includes:

the first spiral inclined plane is arranged on the inner wall of the sliding block;

the second spiral inclined plane is arranged on the end face, far away from the bridge body, of the top block;

the first spiral inclined plane is matched with the second spiral inclined plane in an abutting mode.

Preferably, the slider is sleeved on the periphery of the top block, and an annular boss used for abutting against the end face of the slider is arranged on the periphery of the top block close to the bridge body.

Preferably, the peripheries of the sliding block and the top block are provided with bushings, and an anti-rotation structure is arranged between the bushings and the top block.

Preferably, a second elastic part for driving the sliding block and the jacking block to rotate relatively so as to drive the sliding block and the jacking block to approach through the inclined plane structure is arranged between the sliding block and the bridge body.

Preferably, the driving pulley assembly further comprises an input pulley, the input pulley being coaxially and synchronously rotationally connected to the driving shaft.

Preferably, the first driven pulley is close to the axle body relative to the second driven pulley, the second driven pulley is displaceable along the driving shaft, and the first elastic member is connected to the second driven pulley and the driven shaft, the first driven pulley being fixed relative to the driven shaft.

The application provides a mower comprising a continuously variable transmission mechanism as described in any one of the above.

The technical scheme provided by the application can comprise the following beneficial effects:

when the speed regulation assembly is used, the driving shaft is driven by the engine to rotate, the first driving belt wheel and the second driving belt wheel rotate along with the driving shaft, when the speed regulation assembly drives the first driving belt wheel and the second driving belt wheel to approach, the width of the first belt wheel groove is reduced, the reference diameter of the speed change belt in the first belt wheel groove is increased, the length of the speed change belt is a fixed value, so that the reference diameter of the speed change belt in the second belt wheel groove is driven to be reduced, and correspondingly, the first driven belt wheel and the second driven belt wheel overcome the elasticity of the first elastic part to be far away; when the speed governing subassembly drives first driving pulley and second driving pulley and keeps away from for first pulley groove width grow, the reference diameter of the variable speed area in the first pulley groove diminishes, thereby drives the reference diameter grow of the variable speed area in the second pulley groove, and first elastic component drives first driven pulley and second driven pulley and is close to. Thus, stepless and continuous change of the transmission ratio between the driving belt wheel component and the driven belt wheel component is realized. So set up, through driven stepless, the continuous variation between driving pulley subassembly and the driven pulley subassembly, can realize the variable speed operation through adjusting the speed governing subassembly, convenient and fast just shifts and stablely does not block to the speed governing that makes to ride and take advantage of lawn mower is smooth-going stable, and the reliability is high.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a perspective view of the present continuously variable transmission mechanism shown in accordance with certain exemplary embodiments;

FIG. 2 is a cross-sectional view of the present continuously variable transmission mechanism, according to some exemplary embodiments;

FIG. 3 is a connection block diagram illustrating a throttle structure according to some exemplary embodiments;

FIG. 4 is a partial cutaway view of a speed regulating structure shown in accordance with some exemplary embodiments;

FIG. 5 is a block diagram of an anti-rotation structure according to some exemplary embodiments.

In the figure: 1. a driving pulley assembly; 2. a driven pulley assembly; 3. a speed change belt; 4. a speed regulation component; 5. A first elastic member; 6. a bridge body; 11. a first driving pulley; 12. a second driving pulley; 13. a drive shaft; 14. an input pulley; 21. a first driven pulley; 22. a second driven pulley; 23. a driven shaft; 41. A slider; 42. a top block; 421. an annular boss; 43. a second elastic member; 44. a bushing; 45. a pull rod; 46. rotating the block; 47. a bevel structure; 48. an anti-rotation structure.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus or methods consistent with aspects of the present application.

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to limit the invention to the precise embodiments disclosed. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below are not intended to limit the scope of the present invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1 to 5, the present embodiment provides a continuously variable transmission mechanism including a driving pulley assembly 1, a driven pulley assembly 2, a speed-change belt 3, a governor assembly 4, and a first elastic member 5.

The driving pulley assembly 1 comprises a driving shaft 13, a first driving pulley 11 and a second driving pulley 12, wherein the driving shaft 13 is rotatably connected to the axle body 6, and specifically, the driving pulley can be connected to the axle body 6 through a structure of a bearing, a nut and a snap spring. The first driving pulley 11 and the second driving pulley 12 are coaxially and synchronously connected to the driving shaft 13, so that the first driving pulley 11 and the second driving pulley 12 can coaxially rotate with the driving shaft 13, the driving shaft 13 rotates to drive the first driving pulley 11 and the second driving pulley 12 to synchronously rotate, the first driving pulley 11 or the second driving pulley 12 can displace along the driving shaft 13, a first pulley groove with variable width and gradually expanding along the direction away from the driving shaft is formed between the first driving pulley 11 and the second driving pulley 12, so that the variable speed belt 3 is embedded into the first pulley groove, and when the width of the first pulley groove is changed, the first pulley groove drives the effective reference diameter of the variable speed belt 3 to change.

The driven pulley assembly 2 includes a driven shaft 23, a first driven pulley 21 and a second driven pulley 22, the driven shaft 23 is rotatably connected to the axle body 6, and specifically, the driven pulleys may be connected to the axle body 6 through a structure of a bearing, a nut and a snap spring. The first driven pulley 21 and the second driven pulley 22 are coaxially and synchronously rotatably connected to the driven shaft 23 so that the first driven pulley 21 and the second driven pulley 22 can rotate coaxially with the driven shaft 23, the rotation of the driven shaft 23 can drive the first driven pulley 21 and the second driven pulley 22 to rotate synchronously, and the first driven pulley 21 or the second driven pulley 22 can be displaced along the driven shaft 23, and a second pulley groove of variable width that gradually expands in a direction away from the driven shaft is formed between the first driven pulley 21 and the second driven pulley 22 to allow the transmission belt 3 to be fitted into the second pulley groove, and when the width of the second pulley groove changes, the second pulley groove drives the effective reference diameter of the transmission belt 3 to change.

The variable speed belt 3 is connected with the first belt wheel groove and the second belt wheel groove in a transmission mode, and the rotation kinetic energy of the first belt wheel groove is transmitted to the second belt wheel groove through the friction force between the first belt wheel groove and the variable speed belt 3 and the friction force between the second belt wheel and the variable speed belt 3, so that the driving belt wheel assembly 1 drives the driven belt wheel assembly 2 to rotate.

It will be appreciated that the axial directions of the driving shaft 13 and the driven shaft 23 are parallel in order to ensure stable transmission of the first pulley groove and the second pulley groove.

The governor assembly 4 is used for driving the first driving pulley 11 or the second driving pulley 12 to move along the driving shaft 13. Specifically, the governor assembly 4 may be connected between the first driving pulley 11 or the second driving pulley 12 and the driving shaft 13, or between the first driving pulley 11 or the second driving pulley 12 and the axle body 6, as long as the first driving pulley 11 and the second driving pulley 12 can be driven to approach or move away from each other.

The first elastic member 5 is used for driving the first driven pulley 21 or the second driven pulley 22 to displace along the driven shaft 23 so as to drive the width of the second pulley groove to become smaller. By the elastic action of the first elastic member 5, it is possible that there is an elastic force between the first driven pulley 21 and the second driven pulley 22 that approaches each other, so that the first driven pulley 21 and the second driven pulley elastically clamp the speed change belt 3, and when the first driven pulley 21 and the second driven pulley 22 are away from each other, the first elastic member 5 provides a driving force for the first driven pulley 21 and the second driven pulley 22 to approach each other.

When the speed regulation assembly 4 drives the first driving pulley 11 and the second driving pulley 12 to approach, the width of a first pulley groove is reduced, the reference diameter of the speed change belt 3 in the first pulley groove is increased, the length of the speed change belt 3 is a fixed value, so that the reference diameter of the speed change belt 3 in the second pulley groove is reduced, and accordingly, the first driven pulley 21 and the second driven pulley 22 are far away from each other by overcoming the elasticity of the first elastic piece 5; when the speed regulation assembly 4 drives the first driving pulley 11 and the second driving pulley 12 to be away from each other, the width of the first pulley groove is increased, the reference diameter of the variable speed belt 3 in the second pulley groove is increased, and the first elastic piece 5 drives the first driven pulley 21 and the second driven pulley 22 to be close to each other. In this way, a stepless, continuous change of the transmission ratio between the driving pulley assembly 1 and the driven pulley assembly 2 is achieved.

So set up, through driven stepless, the continuous variation between driving pulley subassembly 1 and the driven pulley subassembly 2, can realize the variable speed operation through adjusting speed governing subassembly 4, convenient and fast just shifts and stablely do not block to the speed governing that makes to ride and take advantage of lawn mower is smooth-going stable, and the reliability is high.

In this embodiment, the first driving pulley 11 is close to the axle body 6 relative to the second driving pulley 12, the first driving pulley 11 can displace along the driving shaft 13, the second driving pulley 12 is fixed relative to the driving shaft 13, and the speed regulation component 4 is disposed between the axle body 6 and the first driving pulley 11, so that the speed regulation component 4 controls the distance between the first driving pulley 11 and the second driving pulley 12 by controlling the distance between the first driving pulley 11 and the axle body 6, and because the axle body 6 has the installation stability, the installation stability of the speed regulation component 4 can be improved, so that the speed change process is stable and reliable.

Of course, in order to rotate the driving shaft 13, the driving pulley assembly 1 further includes an input pulley 14, the input pulley 14 is coaxially and synchronously connected to the driving shaft 13, where the input pulley 14 is in transmission connection with the engine through a transmission belt, and the input pulley 14 is located on one side of the second driving pulley 12 away from the first driving pulley 11.

In some embodiments, the governor assembly 4 includes a slider 41, a top block 42, and a manipulation structure.

The sliding block 41 is coaxially sleeved outside the driving shaft 13 and rotatably connected with the first driving pulley 11, when the first driving pulley 11 rotates along with the driving shaft 13, the sliding block 41 can rotate relative to the first driving pulley 11 and the driving shaft 13, so that the sliding block 41 cannot rotate relative to the bridge body 6, and meanwhile, the sliding block 41 is coaxial with the first driving pulley 11, and when the sliding block 41 drives the first driving pulley 11 to displace, the stress is balanced and stable.

The top block 42 is coaxially sleeved outside the driving shaft 13 and connected with the bridge 6, so that the top block 42 is fixed relative to the bridge 6 and is in stable contact with the sliding block 41, and the sliding block 41 and the top block 42 are matched through the inclined surface structure 47, when the top block 42 and the sliding block 41 rotate relatively, the inclined surface structure 47 acts to enable the top block 42 and the sliding block 41 to displace relatively along the driving shaft 13, for example, when the sliding block 41 rotates relative to the top block 42 along a first direction, the sliding block 41 is far away from the driving shaft 13 relative to the top block 42, and when the sliding block 41 rotates relative to the top block 42 along a second direction, the sliding block 41 approaches to the driving shaft 13 relative to the top block 42.

Specifically, the inclined plane structure 47 may be composed of a spiral inclined plane centered on the driving shaft 13 and a sliding block sliding along the spiral inclined plane, or may be composed of two spiral inclined planes in opposite contact fit.

The control structure is used for driving the sliding block 41 and the ejecting block 42 to rotate relatively, so as to drive the sliding block 41 and the first driving pulley 11 to displace along the driving shaft 13 through the inclined surface structure 47.

Therefore, the sliding block 41 and the first driving belt wheel 11 can be driven to move along the driving shaft 13 only by driving the sliding block 41 and the jacking block 42 to rotate relatively through the control structure, and the rotation kinetic energy is converted into linear kinetic energy under the action of the inclined plane structure 47, so that the torque of the control structure can be increased, the movement of the first driving belt wheel 11 can be slowed down, and the stability of speed change is ensured.

In some preferred embodiments, the steering structure comprises a rotation block 46 and a pull rod 45, wherein the rotation block 46 is rotatably connected to the bridge 6, specifically, the rotation block 46 is triangular, the rotation center is located in the middle, the periphery has at least two swinging ends, one swinging end is connected to the steering system, and the other swinging end is connected to the pull rod 45; one end of the pull rod 45 is connected to the swing end of the rotating block 46, and the other end is connected to the periphery of the sliding block 41, specifically, the periphery of the sliding block 41 is provided with a convex connection position, and one end of the pull rod 45 is hinged to the connection position.

Therefore, the rotating block 46 rotates to drive the pull rod 45 to move, further the slide block 41 is pulled to rotate, kinetic energy conversion is achieved through a connecting rod, and the device is simple in structure, stable, reliable and convenient to control a system.

Inclined plane structure 47 includes first spiral inclined plane and second spiral inclined plane, and wherein, first spiral inclined plane sets up in the inner wall of slider 41, and second spiral inclined plane sets up in kicking block 42 keeps away from the terminal surface of pontic 6, and during the installation, slider 41 cover is established at the lateral wall of kicking block 42 to make first spiral inclined plane and the cooperation of second spiral inclined plane counterbalance, like this, the contact surface of kicking block 42 and slider 41 is great, is favorable to supporting stably, and guarantees stable rotary displacement.

In order to limit the displacement of the slider 41, the slider 41 is sleeved on the periphery of the top block 42, the periphery of the top block 42 close to the bridge body 6 is provided with an annular boss 421, and when the slider 41 displaces relative to the top block 42 in the direction close to the bridge body 6, the annular boss 421 abuts against the end face of the slider 41 to limit the displacement of the slider 41, so that an accident caused by overlarge displacement is avoided.

Further, the peripheries of the sliding block 41 and the top block 42 are sleeved with the bushings 44, so that protection can be performed on the peripheries of the sliding block 41 and the top block 42 to ensure stable matching operation of the sliding block 41 and the top block 42. Moreover, an anti-rotation structure 48 is arranged between the bushing 44 and the top block 42, specifically, a protrusion is arranged on an annular boss 421 of the top block 42, a groove for the protrusion to be embedded is arranged at a corresponding position of the bushing 44, the anti-rotation structure 48 comprises the groove and the protrusion, the bushing 44 can be prevented from rotating relative to the top block 42, a cavity for the slider 41 to be embedded and rotate is formed between the top block 42 and the bushing 44, and the smoothness of the rotational displacement of the slider 41 is improved by adding a lubricant into the cavity.

In some preferred schemes, a second elastic member 43 is disposed between the sliding block 41 and the bridge 6, and is used for driving the sliding block 41 and the top block 42 to rotate relatively, so as to drive the sliding block 41 and the top block 42 to approach each other through the inclined surface structure 47, when the operating and controlling assembly drives the sliding block 41 to rotate and move upwards, a gap is formed between the sliding block 41 and the top block 42, the sliding block 41 cannot be well ensured to return only under the weight action of the sliding block 41, and a return force is applied to the sliding block 41 through the second elastic member 43, so that the sliding block 41 can be ensured to return stably.

For example, when the control assembly drives the sliding block 41 to rotate along the first direction, the sliding block 41 is far away from the top block 42, and the first elastic element 5 drives the sliding block 41 to rotate along the second direction, so as to drive the sliding block 41 to approach the top block 42.

Specifically, the second elastic member 43 includes a torsion spring disposed around the outer periphery of the slider 41.

In this embodiment, the first driven pulley 21 is close to the axle body 6 relative to the second driven pulley 22, the second driven pulley is displaceable along the driving shaft 13, and the first elastic member 5 is located on the side of the second driven pulley 22 away from the first driven pulley 21 and connected to the second driven pulley 22 and the driven shaft 23.

Thus, the first driving pulley 11 and the second driven pulley 22 slide relative to the driving shaft 13 and the driven shaft 23 respectively, the second driving pulley and the first driven pulley 21 are fixed relative to the driving shaft 13 and the driven shaft 23 respectively, and the second driving pulley and the first driven pulley 21 are located at the diagonal positions of the speed changing belt 3, so that the speed changing belt 3 is limited in the area between the second driving pulley and the first driven pulley 21, and stable connection of the speed changing belt 3 can be ensured.

Moreover, when the diameter of the speed-changing belt 3 in the first pulley groove is increased, the speed-changing belt 3 moves upwards along the inclined plane of the second driving pulley 12, meanwhile, the diameter of the speed-changing belt 3 in the second pulley groove is decreased, and the speed-changing belt 3 moves upwards along the inclined plane of the first driven pulley 21, otherwise, the same is beneficial to ensuring that the speed-changing belt 3 is always perpendicular to the driving shaft 13 and the driven shaft 23 in the first pulley groove and the second pulley groove, so that the speed-changing transmission is stable and reliable.

Specifically, the first elastic member 5 includes a compression spring sleeved outside the driven shaft 23, and has one end connected to the driven shaft 23 and the other end connected to the second driven pulley 22.

The present embodiment further provides a lawn mower, which includes the stepless speed change mechanism described in any one of the above embodiments, and of course, further includes a moving component, a driving component, and an operating mechanism, so as to implement the complete function of the lawn mower. So set up, through driven stepless, the continuous variation between driving pulley subassembly 1 and the driven pulley subassembly 2, can realize the variable speed operation through adjusting speed governing subassembly 4, convenient and fast just shifts and stablely do not block to the speed governing that makes to ride and take advantage of lawn mower is smooth-going stable, and the reliability is high. The derivation process of the beneficial effect is substantially similar to that of the beneficial effect brought by the stepless speed change mechanism, and therefore, the description is omitted here.

It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like as used herein refer to an orientation or positional relationship indicated in the drawings for convenience and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description herein, it is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the application comprise basic schemes of the schemes, are independent of each other and are not restricted to each other, but can be combined with each other under the condition of no conflict, so that multiple effects are achieved together.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims (11)

1. A continuously variable transmission mechanism, comprising:

the driving pulley assembly (1) comprises a driving shaft (13), a first driving pulley (11) and a second driving pulley (12), wherein the driving shaft (13) is rotatably connected to a bridge body (6), the first driving pulley (11) and the second driving pulley (12) are coaxially and synchronously and rotatably connected to the driving shaft (13), the first driving pulley (11) or the second driving pulley (12) can be displaced along the driving shaft (13), and a first pulley groove which is variable in width and gradually expands in a direction far away from the driving shaft (13) is formed between the first driving pulley (11) and the second driving pulley (12);

a driven pulley assembly (2) comprising a driven shaft (23), a first driven pulley (21) and a second driven pulley (22), the driven shaft (23) being rotatably connected to the axle body (6), the first driven pulley (21) and the second driven pulley (22) being coaxially and synchronously rotatably connected to the driven shaft (23), the first driven pulley (21) or the second driven pulley (22) being displaceable along the driven shaft (23) and forming a second pulley groove of variable width diverging in a direction away from the driven shaft (23) between the first driven pulley (21) and the second driven pulley (22);

the speed changing belt (3) is in transmission connection with the first pulley groove and the second pulley groove;

the speed regulation assembly (4) is used for driving the first driving belt wheel (11) and the second driving belt wheel (12) to approach to each other along the axial direction of the driving shaft (13);

the first elastic piece (5) is used for driving the first driven belt wheel (21) and the second driven belt wheel (22) to approach to each other along the axial direction of the driven shaft.

2. Continuously variable transmission according to claim 1, characterized in that the first drive pulley (11) is close to the axle body (6) with respect to the second drive pulley (12), the first drive pulley (11) being displaceable along the drive shaft (13), and the governor assembly (4) is arranged between the axle body (6) and the first drive pulley (11), the second drive pulley (12) being fixed with respect to the drive shaft (13).

3. Continuously variable transmission according to claim 2, wherein the governor assembly (4) comprises:

the sliding block (41) is coaxially sleeved outside the driving shaft (13) and is rotatably connected with the first driving belt wheel (11);

the jacking block (42) is coaxially sleeved outside the driving shaft (13) and is connected with the bridge body (6); the sliding block (41) is matched with the top block (42) through a bevel structure (47);

and the control structure is used for driving the sliding block (41) and the jacking block (42) to rotate relatively so as to drive the sliding block (41) and the first driving belt wheel (11) to displace along the driving shaft (13) through the inclined surface structure (47).

4. The continuously variable transmission mechanism of claim 3, wherein the manipulation structure comprises:

a rotation block (46) rotatably connected to the bridge body (6);

and one end of the pull rod (45) is connected to the swinging end of the rotating block (46), and the other end of the pull rod is connected to the periphery of the sliding block (41).

5. Continuously variable transmission according to claim 3, wherein the ramp structure (47) comprises:

the first spiral inclined plane is arranged on the inner wall of the sliding block (41);

the second spiral inclined surface is arranged on the end face, far away from the bridge body (6), of the top block (42);

the first spiral inclined plane is matched with the second spiral inclined plane in an abutting mode.

6. The continuously variable transmission mechanism according to claim 3, wherein the sliding block (41) is sleeved on the periphery of the top block (42), and an annular boss (421) for abutting against the end face of the sliding block (41) is arranged on the periphery of the top block (42) close to the bridge body (6).

7. The continuously variable transmission mechanism according to claim 6, wherein a bush (44) is provided on the outer peripheries of the slider (41) and the top block (42), and an anti-rotation structure (48) is provided between the bush (44) and the top block (42).

8. The continuously variable transmission mechanism according to claim 3, wherein a second elastic member (43) is disposed between the sliding block (41) and the bridge body (6) for driving the sliding block (41) and the top block (42) to rotate relatively so as to drive the sliding block (41) and the top block (42) to approach each other through the slope structure (47).

9. Continuously variable transmission according to claim 2, characterized in that the driving pulley assembly (1) further comprises an input pulley (14), the input pulley (14) being coaxially and synchronously rotationally connected to the driving shaft (13).

10. Continuously variable transmission according to claim 2, characterized in that the first driven pulley (21) is close to the axle body (6) with respect to the second driven pulley (22), which is displaceable along the drive shaft (13), and the first elastic element (5) is connected to the second driven pulley (22) and to the driven shaft (23), the first driven pulley (21) being fixed with respect to the driven shaft (23).

11. A lawnmower comprising a continuously variable transmission according to any one of claims 1 to 10.

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