CN220416133U - Stepless speed change mechanism - Google Patents

Abstract

The application relates to the field of stepless speed change, and particularly provides a stepless speed change mechanism, which comprises two driving wheels, a first driving belt and a second driving belt; each driving wheel comprises a mounting sleeve, a plurality of first driving blocks and a plurality of second driving blocks which are arranged on the mounting sleeve and are distributed circumferentially, and the diameter of the circumference where the plurality of first driving blocks are positioned is different from the diameter of the circumference where the plurality of second driving blocks are positioned; the first transmission belt is connected between a plurality of first transmission blocks of the two transmission wheels, and the second transmission belt is connected between a plurality of second transmission blocks of the two transmission wheels; and each mounting sleeve is provided with a reducing mechanism for driving a plurality of first transmission blocks and a plurality of second transmission blocks to move along the radial direction of the mounting sleeve. This scheme carries out power transmission through setting up two sets of transmission piece and drive belt, not only has overload self preservation protects's function, and security, stability are better, can adapt to different operating mode and user demand moreover, and the suitability is good.

Description

Stepless speed change mechanism

Technical Field

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

Background

CVT (Continuously Variable Transmission), continuously variable automatic transmission) is one type of transmission. The continuously variable transmission can realize continuous change of transmission ratio, achieves the best matching of the required mechanical transmission, and has the characteristics of no gear shifting response, no gear shifting frustration and high transmission rate.

Currently, a continuously variable transmission mechanism is generally composed of two groups of driving wheels and a driving belt, and the driving belt and the driving wheels are in power transmission in a friction, tooth meshing mode and the like. In practical application, the driving belt needs to be matched with various different working conditions and use requirements, so that the use requirements on the driving belt are larger, the reliability requirements are higher, and when the driving belt is in slipping or breaking, the continuously variable transmission mechanism can be caused to immediately fail or even fail, so that the potential safety hazard is large, and the stability is poor.

Disclosure of Invention

Based on the above, the utility model provides a stepless speed change mechanism, which solves the problems of poor stability, large potential safety hazard and severe requirements on a transmission belt of the existing stepless speed change mechanism.

In one aspect, a continuously variable transmission mechanism is provided, which comprises two driving wheels, and a first driving belt and a second driving belt which are arranged between the two driving wheels;

each driving wheel comprises a mounting sleeve, a plurality of first driving blocks and a plurality of second driving blocks which are arranged on the mounting sleeve and distributed circumferentially, and the diameter of the circumference where the plurality of first driving blocks are located is different from the diameter of the circumference where the plurality of second driving blocks are located;

the first transmission belt is connected between a plurality of first transmission blocks of the two transmission wheels, and the second transmission belt is connected between a plurality of second transmission blocks of the two transmission wheels;

and each mounting sleeve is provided with a reducing mechanism for driving a plurality of first transmission blocks and a plurality of second transmission blocks to move along the radial direction of the mounting sleeve.

In one embodiment, the reducing mechanism includes a plurality of support rods disposed on the mounting sleeve and a driving structure for driving the plurality of support rods to extend and retract along a radial direction of the mounting sleeve, and each of the first transmission block and each of the second transmission blocks is fixed on each of the support rods.

In one embodiment, the end part of each supporting rod extends out to the outer side of the circumference of the mounting sleeve in a radial direction, and each first transmission block is respectively fixed on the end part of each supporting rod extending out of the mounting sleeve;

and the part of each supporting rod, which is positioned at the inner side of the circumferential direction of the mounting sleeve, is provided with a limiting column extending to the outer side of the driving wheel in the axial direction, and each second driving block is respectively fixed on each limiting column.

In one embodiment, the drive structure includes a drive assembly and a transmission assembly;

the transmission assembly comprises a mounting disc rotatably arranged in the mounting sleeve, a plurality of arc-shaped limiting grooves are circumferentially distributed on the mounting disc, the limiting grooves are spirally and radially arranged by taking the center of the mounting disc as a circle center, a plurality of linear guide grooves extending along the radial direction are circumferentially distributed on the mounting sleeve, and each limiting column penetrates into each limiting groove and each guide groove respectively;

the driving assembly is used for driving the mounting plate to rotate.

In one embodiment, the driving assembly comprises a driving ring rotatably arranged on the mounting sleeve, and the driving ring is fixedly connected with the mounting disc;

the driving ring is sleeved with a gear, and the mounting sleeve is provided with a rack meshed with the gear and a first driving piece for driving the rack to move.

In one embodiment, the first driving member includes a first telescopic rod fixed to the mounting sleeve, and a telescopic end of the first telescopic rod is fixedly connected to the rack.

In one embodiment, the continuously variable transmission mechanism further comprises a variable-pitch structure, wherein the variable-pitch structure comprises a first supporting seat, a second supporting seat and a second driving piece for driving the first supporting seat and/or the second supporting seat to move;

the first support seat and the second support seat are respectively provided with a rotating shaft in a rotating mode, and the two rotating shafts are respectively and fixedly connected with the mounting sleeves of the two driving wheels.

In one embodiment, the distance-varying structure further comprises a support frame, the support frame is provided with a chute, and the first support seat and/or the second support seat are/is slidably mounted in the chute;

the second driving piece comprises a second telescopic rod fixedly arranged in the sliding groove, and the output end of the second telescopic rod is connected with the first supporting seat and/or the second supporting seat which are slidably arranged in the sliding groove.

In one embodiment, the rotating shaft passes through the driving ring and extends into the mounting sleeve, and the driving ring and the mounting disc are both rotatably sleeved on the rotating shaft;

the rotating shaft is fixedly connected with a connecting frame, and the connecting frame is fixedly connected with the mounting sleeve.

In one embodiment, a surface of the first transmission belt, which is matched with the first transmission block, is provided with a transmission tooth slot, and the surface of the first transmission block is provided with meshing teeth meshed with the transmission tooth slot;

the surface of the second transmission belt, which is matched with the second transmission block, is also provided with a transmission tooth slot, and the surface of the second transmission block is provided with meshing teeth meshed with the transmission tooth slot.

The beneficial effects are that: the continuously variable transmission mechanism performs power transmission jointly through the first transmission belt and the second transmission belt, has good power transmission effect and high efficiency, can not immediately fail even if one transmission belt breaks, has the overload self-protection function, and is higher in safety and better in stability.

In addition, in the stepless speed change mechanism, the diameter of the circumference where the first transmission block is located is different from the diameter of the circumference where the second transmission block is located, that is, the diameter of a first belt wheel formed by combining the first transmission blocks is different from the diameter of a second belt wheel formed by combining the second transmission blocks, so that two groups of transmission belts can respectively meet different working condition demands, the suitability is better, the use demand on a single transmission belt is reduced, and the integral reliability of the speed change mechanism is improved.

Drawings

FIG. 1 is a schematic view of a continuously variable transmission mechanism in one embodiment;

FIG. 2 is a schematic diagram of the structure of a driving wheel in one embodiment;

FIG. 3 is a schematic view of an embodiment of a drive wheel with a second side plate removed;

FIG. 4 is a schematic diagram of a drive assembly mounted to a drive wheel in one embodiment;

FIG. 5 is a schematic view of an embodiment of a drive wheel with a first side plate removed;

FIG. 6 is a longitudinal cross-sectional view of a drive wheel in one embodiment;

FIG. 7 is a schematic view of a structure of an infinitely variable transmission at another angle in one embodiment;

fig. 8 is a partial enlarged view at a in fig. 7.

Reference numerals in the drawings of the specification include: the driving wheel 1, the mounting sleeve 101, the first side plate 1011, the supporting ring 1012, the second side plate 1013, the first driving block 102, the second driving block 103, the first driving belt 2, the second driving belt 3, the supporting rod 4, the limiting column 5, the mounting plate 6, the limiting groove 7, the guiding groove 8, the driving ring 9, the gear 10, the rack 11, the first telescopic rod 12, the fixed block 13, the connecting block 14, the first supporting seat 15, the second supporting seat 16, the second telescopic rod 17, the supporting frame 18, the sliding groove 19, the rotating shaft 20 and the connecting frame 21.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It should be noted that the illustrations provided in the present embodiment are merely schematic illustrations of the basic idea of the present utility model.

The structures, proportions, sizes, etc. shown in the drawings attached hereto are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are particularly adapted to the specific details of construction and the use of the utility model, without departing from the spirit or essential characteristics thereof, which fall within the scope of the utility model as defined by the appended claims.

References in this specification to orientations or positional relationships as "upper", "lower", "left", "right", "intermediate", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc., are based on the orientation or positional relationships shown in the drawings, are also for convenience of description only, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

When the existing stepless speed change mechanism bears large torque, the phenomenon of slipping easily occurs, and the transmission belt is easy to break. And because the existing stepless speed change mechanism usually only has one driving belt, the failure or even failure of the stepless speed change mechanism can be caused as long as the driving belt is slipped or broken, the potential safety hazard is large, and the stability is poor. Based on the above, the embodiment of the utility model provides a stepless speed change mechanism, which is used for power transmission by arranging two groups of transmission blocks and transmission belts, has the overload self-protection function, is good in safety and stability, can adapt to different working conditions and use requirements, and is good in adaptability.

Specifically, the continuously variable transmission mechanism provided by at least one embodiment of the utility model comprises two driving wheels, and a first driving belt and a second driving belt which are arranged between the two driving wheels;

each driving wheel comprises a mounting sleeve, a plurality of first driving blocks and a plurality of second driving blocks which are arranged on the mounting sleeve and are distributed circumferentially, and the diameter of the circumference where the plurality of first driving blocks are positioned is different from the diameter of the circumference where the plurality of second driving blocks are positioned;

the first transmission belt is connected between a plurality of first transmission blocks of the two transmission wheels, and the second transmission belt is connected between a plurality of second transmission blocks of the two transmission wheels;

and each mounting sleeve is provided with a reducing mechanism for driving a plurality of first transmission blocks and a plurality of second transmission blocks to move along the radial direction of the mounting sleeve.

The continuously variable transmission mechanism of the embodiment performs power transmission jointly through the first transmission belt and the second transmission belt, has good power transmission effect and high efficiency, and even if one transmission belt breaks, the continuously variable transmission mechanism cannot immediately fail, has the overload self-protection function, and is higher in safety and better in stability.

In addition, in this embodiment, the diameter of the circumference where a plurality of first transmission blocks are located is different from the diameter of the circumference where a plurality of second transmission blocks are located, that is, the diameter of a first belt wheel formed by combining each first transmission block is different from the diameter of a second belt wheel formed by combining each second transmission block, so that the lengths and the transmission diameters of the first transmission belt and the second transmission belt are different, thereby enabling two groups of transmission belts to respectively meet different working condition requirements, achieving better suitability, reducing the use requirement on a single transmission belt, and improving the overall reliability of the speed change mechanism.

Embodiments of the present utility model and examples thereof are described in detail below with reference to the attached drawings.

Fig. 1 is a schematic structural diagram of a continuously variable transmission mechanism according to at least one embodiment of the present utility model. Referring to fig. 1, the continuously variable transmission mechanism includes two transmission wheels 1, a first transmission belt 2, and a second transmission belt 3.

The two driving wheels 1 are respectively a driving wheel and a driven wheel, wherein the driving wheel is used as an input end of the speed change mechanism and is used for being connected with the power input device, and the driven wheel is used as an output end of the speed change mechanism and is used for being connected with the power output device. In this embodiment, the two driving wheels 1 have the same structure, and only one driving wheel 1 will be described below.

Referring to fig. 1, in the present embodiment, the driving wheel 1 includes a mounting sleeve 101, and a plurality of first driving blocks 102 and a plurality of second driving blocks 103 provided on the mounting sleeve 101.

The mounting sleeve 101 is a revolving body, and is used for driving the first transmission blocks 102 and the second transmission blocks 103 to rotate around the axes thereof. For example, referring to fig. 2 to 5, the mounting sleeve 101 includes an annular support ring 1012, and first and second side plates 1011, 1013, wherein the first and second side plates 1011, 1013 are fixedly mounted on axial sides of the support ring 1012, respectively, to combine to form the mounting sleeve 101 having a cavity therein.

Referring to fig. 2, in the present embodiment, a plurality of first transmission blocks 102 and a plurality of second transmission blocks 103 are all circumferentially distributed on the mounting sleeve 101, and the circumference where the plurality of first transmission blocks 102 are located and the circumference where the plurality of second transmission blocks 103 are located are concentric with the mounting sleeve 101. In this way, the plurality of first transmission blocks 102 may be combined to form a first belt wheel concentric with the mounting sleeve 101, the plurality of second transmission blocks 103 may be combined to form a second belt wheel concentric with the mounting sleeve 101, and when the mounting sleeve 101 rotates, the first belt wheel and the second belt wheel may be driven to rotate, so as to provide a foundation for supporting and transmitting the first transmission belt 2 and the second transmission belt 3.

Further, in the present embodiment, the diameter of the circumference where the plurality of first transmission blocks 102 are located is different from the diameter of the circumference where the plurality of second transmission blocks 103 are located. For example, referring to fig. 2, a plurality of first transmission blocks 102 are uniformly distributed on the outer side of the mounting sleeve 101 in the circumferential direction, and a plurality of second transmission blocks 103 are disposed on one side plate of the mounting sleeve 101 and are uniformly distributed in the circumferential direction around the center of the mounting sleeve 101. In this way, the diameter of the first belt wheel formed by combining the first transmission blocks 102 is different from the diameter of the second belt wheel formed by combining the second transmission blocks 103, so that the speed change mechanism can adapt to more working condition demands, and the adaptability is better.

Referring to fig. 1, in the present embodiment, the first belt 2 is connected between the first transmission blocks 102 of the two transmission wheels 1, the second belt 3 is connected between the second transmission blocks 103 of the two transmission wheels 1, that is, the first belt 2 is connected between the two first pulleys, and the second belt 3 is connected between the two second pulleys. In this way, when the driving wheel drives the first transmission block 102 and the second transmission block 103 on the driving wheel to move, the first transmission belt 2 and the second transmission belt 3 can be driven, and the first transmission belt 2 and the second transmission belt 3 transmit power to the first transmission block 102 and the second transmission block 103 of the driven wheel, so that the driven wheel is driven to rotate, and the power transmission between the driving wheel and the driven wheel is realized.

More specifically, in the present embodiment, the first belt 2 and the second belt 3 may be toothed belts or V-belts, and the first transmission block 102 and the second transmission block 103 are provided with meshing teeth or V-grooves matching the first belt 2 and the second belt 3, respectively, so as to achieve power transmission between the belts and the transmission blocks in a tooth transmission or friction transmission manner.

For example, referring to fig. 1, in the present embodiment, the first and second transmission belts 2 and 3 are toothed belts each having transmission tooth grooves on the inner side, and the outer walls of the first and second transmission blocks 102 and 103 are each provided with meshing teeth that match the transmission tooth grooves. Therefore, when the transmission belt is arranged on the transmission wheel 1, the transmission tooth grooves can be meshed with the meshing teeth on the transmission block, so that the transmission block and the transmission belt can be subjected to power transmission, and the transmission stability between the transmission block and the transmission belt is ensured.

Based on the structural design, the power transmission is carried out by arranging two groups of transmission belts, so that the speed change mechanism has the advantages of good power transmission effect, high efficiency, overload self-protection function, higher safety and better stability. In practical application, one of the first driving belt 2 and the second driving belt 3 can be taken down according to working conditions or use requirements, and the other driving belt is selected for power transmission, so that the driving belt can be better matched with the corresponding working conditions, the use requirements of a single driving belt are reduced, the reliability requirements of the single driving belt are also reduced, and the stability of a speed change structure is better.

In this embodiment, the installation sleeve 101 is further provided with a reducing mechanism, and the reducing mechanism is used for driving the plurality of first transmission blocks 102 and the plurality of second transmission blocks 103 to move along the radial direction of the installation sleeve 101, so that the diameters of the circumference where the plurality of first transmission blocks 102 are located and the circumference where the plurality of second transmission blocks 103 are located are changed, thereby realizing the adjustment of the diameters of the first belt wheel and the second belt wheel, and when the diameters of the first belt wheel and the second belt wheel on the two transmission wheels 1 are changed, the transmission ratio of the speed change mechanism is correspondingly changed, and further realizing the speed change adjustment of the speed change mechanism.

For example, referring to fig. 3, in the present embodiment, the reducing mechanism includes a plurality of support rods 4 disposed on the mounting sleeve 101 and a driving structure for driving the plurality of support rods 4 to extend and retract in a radial direction of the mounting sleeve 101, and each first transmission block 102 and each second transmission block 103 are fixedly connected with each support rod 4. Thus, when the driving structure drives the supporting rod 4 to stretch out and draw back, the first transmission block 102 and the second transmission block 103 can be driven to move along the radial direction of the mounting sleeve 101, so that the diameters of the first belt wheel and the second belt wheel are adjusted.

Specifically, referring to fig. 3, in the present embodiment, a plurality of sliding holes are uniformly formed on the supporting ring 1012 of the mounting sleeve 101 in the circumferential direction, each supporting rod 4 is slidably mounted in each sliding hole, and the driving structure can drive each supporting rod 4 to slide radially along each sliding hole.

More specifically, referring to fig. 3, the outer end of each support rod 4 extends radially outward to the circumferential outer side of the mounting sleeve 101, the inner end of each support rod 4 extends into the inner cavity of the mounting sleeve 101, each first transmission block 102 is fixedly connected to the outer end of each support rod 4, and each second transmission block 103 is fixedly connected to the inner end of each support rod 4. In this embodiment, the outer end of the support rod 4 refers to the end of the support rod 4 located outside the mounting sleeve 101, and the inner end of the support rod 4 refers to the end of the support rod 4 located in the inner cavity of the mounting sleeve 101.

For example, referring to fig. 3 and 6, in the present embodiment, the first driving block 102 is an arc-shaped block, and a side thereof facing away from the first driving belt 2 is fixedly connected to an outer end of the support rod 4. The second transmission block 103 is of a cylindrical structure, the inner end of the supporting rod 4 is fixedly connected with a limiting column 5, the limiting column 5 is arranged along the axial direction of the mounting sleeve 101 and extends to the outer side of the mounting sleeve 101 in the axial direction, and the second transmission block 103 is fixed on the end portion, extending out of the mounting sleeve 101, of the limiting column 5.

Further, in order to ensure that each second transmission block 103 can move along with the supporting rod 4, referring to fig. 2 and 6, in this embodiment, a plurality of linear guide grooves 8 extending along the radial direction of the second side plate 1013 of the mounting sleeve 101 are circumferentially distributed on the second side plate 1013, and each limit post 5 passes through each guide groove 8, so, when the driving structure drives the supporting rod 4 to stretch, the supporting rod 4 can drive the limit post 5 to move along the guide groove 8, so that the second transmission block 103 moves radially, and the adjustment of the diameter of the second belt wheel is realized.

In the above structural design, the first transmission block 102 is located at the outer end of the supporting rod 4, the second transmission block 103 is located at the inner end of the supporting rod 4, so that the position adjustment range of the first transmission block 102 is outside the outer peripheral surface of the mounting sleeve 101, the position adjustment range of the second transmission block 103 is between the axle center and the outer peripheral surface of the mounting sleeve 101, and the adjustment ranges of the two can be complemented, so that the speed change mechanism has a larger selection interval in the aspect of the diameter of a belt wheel, can adapt to more working conditions, and has good adaptability.

Referring to fig. 3, 5 and 6, in this embodiment, the drive structure includes a drive assembly and a transmission assembly. Wherein, drive assembly includes mounting plate 6, and mounting plate 6 rotationally sets up in the inner chamber of installation sleeve 101, and circumference distributes on the mounting plate 6 has a plurality of arc spacing groove 7, and each spacing groove 7 is the radial setting of spiral with the center of mounting plate 6 as the centre of a circle, and the spacing post 5 of each bracing piece 4 inner passes each spacing groove 7 respectively. So, when mounting plate 6 rotates, mounting plate 6 accessible limit groove 7 on it drives each spacing post 5 and removes, again because spacing post 5 is spacing in guide way 8, consequently when mounting plate 6 drives spacing post 5 and removes, spacing post 5 can only follow guide way 8 and remove in the radial direction of installation sleeve 101 to drive bracing piece 4 and stretch out and draw back along radial direction, and then realize the regulation of first band pulley and second band pulley diameter.

Based on the above structural design, in this embodiment, the limiting post 5 can be used as a supporting member for installing the second transmission block 103, and can also be used as a limiting member and a guiding member for driving the supporting rod 4 to stretch and retract and providing guidance for the supporting rod 4, so as to integrate multiple functions and have ingenious conception.

In this embodiment, the driving assembly is used to drive the mounting plate 6 to rotate. For example, referring to fig. 4 to 6, the driving assembly includes a driving ring 9, and the driving ring 9 is rotatably mounted on a mounting sleeve 101 and fixedly connected with the mounting disc 6, so that the rotation of the driving ring 9 can drive the mounting disc 6 to rotate, thereby realizing the adjustment of the speed ratio.

Specifically, referring to fig. 6, in the present embodiment, a through hole is opened at the center of the first side plate 1011, the driving ring 9 is rotatably installed in the through hole, and a portion of the driving ring 9 extends inwardly through the through hole to the inside of the mounting sleeve 101 to be fixedly connected with the mounting plate 6, and a portion of the driving ring 9 located outside the first side plate 1011 is fixedly sleeved with the gear 10. Referring to fig. 4, correspondingly, a rack 11 engaged with the gear 10 is further provided on the outer side of the first side plate 1011, and the rack 11 is laterally movable under the driving of the first driving member. Thus, when the diameters of the first belt wheel and the second belt wheel need to be adjusted, the rack 11 is driven to transversely move by the first driving piece, the rack 11 moves to drive the gear 10 to rotate, the gear 10 drives the driving ring 9 to rotate, the driving ring 9 drives the mounting plate 6 to rotate, and the mounting plate 6 drives the support rod 4 to stretch out and draw back, so that the positions of the first transmission block 102 and the second transmission block 103 are adjusted, and the diameters of the first belt wheel and the second belt wheel are adjusted.

More specifically, referring to fig. 4, in the present embodiment, the first driving member includes a first telescopic link 12, the first telescopic link 12 is fixed to the outer side of the first side plate 1011 by a fixing block 13, a connection block 14 is fixedly connected to the telescopic end of the first telescopic link 12, and a rack 11 is fixedly connected to the lower side of the connection block 14. Thus, when the first telescopic rod 12 drives the telescopic end to stretch out and draw back, the rack 11 can be driven to move transversely, and the gear 10 is driven to rotate to realize the stretching out and drawing back of the support rod 4.

Referring to fig. 7, in this embodiment, the driving wheel 1 is further connected with a rotating shaft 20, and the rotating shaft 20 is used as an input shaft or an output shaft of the speed change mechanism to be connected with an external device, so as to realize power transmission between the driving wheel 1 and the external device.

Specifically, referring to fig. 7 and 8, in the present embodiment, two L-shaped connection frames 21 are fixedly connected to the outer side of the first side plate 1011, a rotation shaft 20 is fixedly connected between the two connection frames 21, and the rotation shaft 20 is coaxially disposed with the mounting sleeve 101. Thus, when the rotating shaft 20 (the driving wheel 1) rotates, the driving wheel 1 (the rotating shaft 20) can be driven to rotate by the connecting frame 21, so that torque transmission between the rotating shaft 20 and the driving wheel 1 is realized.

Further, referring to fig. 6, in the present embodiment, the end of the rotating shaft 20 extends to the inside of the mounting sleeve 101 through the inner hole of the driving ring 9 and the through hole on the first side plate 1011, and both the driving ring 9 and the mounting plate 6 are rotatably sleeved on the rotating shaft 20. In this way, the shaft 20 can form a support for the drive ring 9 and the mounting plate 6, ensuring the stability of the drive ring 9 and the mounting plate 6.

In this embodiment, the continuously variable transmission mechanism further includes a distance-changing structure for adjusting the center distance between the two driving wheels 1, and the center distance between the two driving wheels 1 is adjusted by the distance-changing structure, so that the continuously variable transmission mechanism can be applied to devices with different requirements on the center distance, and has stronger universality.

For example, referring to fig. 7, in the present embodiment, the pitch-changing structure includes a first supporting seat 15, a second supporting seat 16, and a second driving member for driving the first supporting seat 15 and/or the second supporting seat 16 to move, and the rotating shafts 20 of the two driving wheels 1 are respectively in rotational fit with the first supporting seat 15 and the second supporting seat 16. In this way, when the center distance between the two driving wheels 1 needs to be adjusted, the second driving piece drives the first supporting seat 15 and/or the second supporting seat 16 to move, and the first supporting seat 15 and/or the second supporting seat 16 drives one or both driving wheels 1 to move through the rotating shaft 20, so that the center distance between the two driving wheels 1 is adjusted.

Specifically, referring to fig. 7, in the present embodiment, the continuously variable transmission mechanism further includes a support frame 18, a sliding groove 19 is provided on the support frame 18, and the first support seat 15 and/or the second support seat 16 are slidably mounted in the sliding groove 19. The second driving piece comprises a second telescopic rod 17 fixedly arranged in the sliding groove 19, and the telescopic end of the second telescopic rod 17 is connected with the first supporting seat 15 and/or the second supporting seat 16 which are slidably arranged in the sliding groove 19. In this way, the second telescopic rod 17 drives the first supporting seat 15 and/or the second supporting seat 16 to slide along the sliding groove 19, so that the center distance adjustment of the two driving wheels 1 can be realized.

It should be appreciated that the above-described structure in which the first support base 15 and/or the second support base 16 move may include the following three cases:

1. the first supporting seat 15 is fixed on the supporting frame 18, and the second supporting seat 16 is slidably mounted on the sliding groove 19, that is, the second supporting seat 16 is movable, in which case the telescopic end of the second telescopic rod 17 is fixedly connected with the second supporting seat 16.

2. The second supporting seat 16 is fixed on the supporting frame 18, and the first supporting seat 15 is slidably mounted on the sliding groove 19, that is, the first supporting seat 15 is movable, in which case the telescopic end of the second telescopic rod 17 is fixedly connected with the first supporting seat 15.

3. The first supporting seat 15 and the second supporting seat 16 are both slidably mounted in the sliding groove 19, that is, the first supporting seat 15 and the second supporting seat 16 are both movable, in which case the second telescopic rod 17 is a bidirectional telescopic rod, which has two telescopic ends and is fixedly connected with the first supporting seat 15 and the second supporting seat 16 respectively.

Referring to fig. 7, in this embodiment, it is preferable that the first support seat 15 and the second support seat 16 are both slidably mounted in the chute 19, that is, the first support seat 15 and the second support seat 16 are both movable, so that the adjustability of the center distance of the driving wheel 1 is stronger and the adaptability is better.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. The stepless speed change mechanism is characterized by comprising two driving wheels (1), and a first driving belt (2) and a second driving belt (3) which are arranged between the two driving wheels (1);

each driving wheel (1) comprises a mounting sleeve (101), and a plurality of first driving blocks (102) and a plurality of second driving blocks (103) which are arranged on the mounting sleeve (101) and are circumferentially distributed, wherein the diameter of the circumference where the plurality of first driving blocks (102) are positioned is different from the diameter of the circumference where the plurality of second driving blocks (103) are positioned;

the first transmission belt (2) is connected between a plurality of first transmission blocks (102) of the two transmission wheels (1), and the second transmission belt (3) is connected between a plurality of second transmission blocks (103) of the two transmission wheels (1);

each mounting sleeve (101) is provided with a reducing mechanism for driving a plurality of first transmission blocks (102) and a plurality of second transmission blocks (103) to move along the radial direction of the mounting sleeve (101).

2. The continuously variable transmission mechanism according to claim 1, wherein: the reducing mechanism comprises a plurality of support rods (4) arranged on the mounting sleeve (101) and a driving structure for driving the support rods (4) to stretch along the radial direction of the mounting sleeve (101), and each first transmission block (102) and each second transmission block (103) are respectively fixed on each support rod (4).

3. The continuously variable transmission mechanism according to claim 2, characterized in that: the end part of each supporting rod (4) radially extends outwards to the outer side of the circumference of the mounting sleeve (101), and each first transmission block (102) is respectively fixed on the end part of each supporting rod (4) extending out of the mounting sleeve (101);

the part of each supporting rod (4) located on the inner side of the circumference of the mounting sleeve (101) is provided with a limiting column (5) extending to the outer side of the driving wheel (1) in the axial direction, and each second driving block (103) is respectively fixed on each limiting column (5).

4. A continuously variable transmission as claimed in claim 3, wherein: the driving structure comprises a driving assembly and a transmission assembly;

the transmission assembly comprises a mounting disc (6) which is rotatably arranged in a mounting sleeve (101), a plurality of arc-shaped limit grooves (7) are circumferentially distributed on the mounting disc (6), each limit groove (7) is spirally and radially arranged by taking the center of the mounting disc (6) as a circle center, a plurality of linear guide grooves (8) which extend along the radial direction are circumferentially distributed on the mounting sleeve (101), and each limit post (5) penetrates into each limit groove (7) and each guide groove (8) respectively;

the driving component is used for driving the mounting plate (6) to rotate.

5. The continuously variable transmission mechanism according to claim 4, wherein: the driving assembly comprises a driving ring (9) rotatably arranged on the mounting sleeve (101), and the driving ring (9) is fixedly connected with the mounting disc (6);

the driving ring (9) is sleeved with a gear (10), and the mounting sleeve (101) is provided with a rack (11) meshed with the gear (10) and a first driving piece for driving the rack (11) to move.

6. The continuously variable transmission mechanism according to claim 5, wherein: the first driving piece comprises a first telescopic rod (12) fixed on the mounting sleeve (101), and the telescopic end of the first telescopic rod (12) is fixedly connected with the rack (11).

7. The continuously variable transmission mechanism according to claim 5 or 6, characterized in that: the stepless speed change mechanism further comprises a variable-pitch structure, wherein the variable-pitch structure comprises a first supporting seat (15), a second supporting seat (16) and a second driving piece for driving the first supporting seat (15) and/or the second supporting seat (16) to move;

the first support seat (15) and the second support seat (16) are respectively provided with a rotating shaft (20) in a rotating mode, and the two rotating shafts (20) are respectively and fixedly connected with the mounting sleeves (101) of the two driving wheels (1).

8. The continuously variable transmission mechanism according to claim 7, wherein: the distance-changing structure further comprises a supporting frame (18), the supporting frame (18) is provided with a sliding groove (19), and the first supporting seat (15) and/or the second supporting seat (16) are/is slidably arranged in the sliding groove (19);

the second driving piece comprises a second telescopic rod (17) fixedly arranged in the sliding groove (19), and the telescopic end of the second telescopic rod (17) is connected with the first supporting seat (15) and/or the second supporting seat (16) which are slidably arranged in the sliding groove (19).

9. The continuously variable transmission mechanism according to claim 7, wherein: the rotating shaft (20) penetrates through the driving ring (9) to extend into the mounting sleeve (101), and the driving ring (9) and the mounting disc (6) are both rotatably sleeved on the rotating shaft (20);

the rotating shaft (20) is fixedly connected with a connecting frame (21), and the connecting frame (21) is fixedly connected with the mounting sleeve (101).

10. The continuously variable transmission mechanism according to claim 1, wherein: a transmission tooth slot is formed in the surface of the first transmission belt (2) matched with the first transmission block (102), and meshing teeth meshed with the transmission tooth slot are formed in the surface of the first transmission block (102);

the surface of the second transmission belt (3) matched with the second transmission block (103) is also provided with a transmission tooth slot, and the surface of the second transmission block (103) is provided with meshing teeth meshed with the transmission tooth slot.