CN116928300A - Synchronous belt transmission structure based on double-sided arc gear - Google Patents

Abstract

The embodiment of the disclosure discloses a synchronous belt transmission structure based on a double-sided arc gear. The synchronous belt transmission structure based on the double-sided arc gears comprises a synchronous belt and two double-sided arc gears matched with the synchronous belt; the double-sided arc gear comprises gear teeth and gear tooth grooves which are repeatedly arranged along the circumferential direction, the gear teeth are provided with first meshing lines protruding outwards on the cross section of the double-sided arc gear, the first meshing lines are arc lines, the gear tooth grooves are provided with second meshing lines recessed inwards, and the second meshing lines are arc lines; the synchronous belt comprises belt teeth and belt tooth grooves which are repeatedly arranged along the circumferential direction, the cross section of the synchronous belt is provided with a third meshing line which protrudes outwards, the third meshing line is an arc line, the belt tooth groove is provided with a fourth meshing line which is concave inwards, and the fourth meshing line is an arc line; in the transmission process of the synchronous belt transmission structure, the third meshing line is meshed with the second meshing line, or the fourth meshing line is meshed with the first meshing line.

Description

Synchronous belt transmission structure based on double-sided arc gear

Technical Field

The disclosure relates to the technical field of mechanical structures, in particular to a synchronous belt transmission structure based on a double-sided arc gear.

Background

The synchronous belt transmission is a synchronous belt with equidistant tooth shape on the inner peripheral surface and a gear structure (or synchronous pulley) matched with the synchronous belt. When rotating, the belt teeth are meshed with the gear tooth grooves of the gears to transmit power.

In the prior art, the belt teeth are generally trapezoidal teeth, and the tooth sockets and the gear teeth of the gears matched with the belt teeth are also trapezoidal teeth, so that the inventor discovers that the above structure at least has the following problems that the transmission effect of the synchronous belt is affected: trapezoidal teeth in the synchronous belt and the gear are not easy to process; the undercut phenomenon exists; gaps exist in the process of matching the synchronous belt with the gear structure; reverse gap.

Disclosure of Invention

In view of the above, the embodiments of the present disclosure provide a synchronous belt transmission structure based on a double-sided circular gear, which at least partially solves the problem in the prior art that the synchronous belt transmission effect is to be improved.

The embodiment of the disclosure provides a synchronous belt transmission structure based on a double-sided arc gear, which adopts the following technical scheme:

the synchronous belt transmission structure based on the double-sided arc gears comprises a synchronous belt and two double-sided arc gears matched with the synchronous belt;

the double-sided arc gear comprises gear teeth and gear tooth grooves which are repeatedly arranged along the circumferential direction, wherein on the cross section of the double-sided arc gear, the gear teeth are provided with first meshing lines protruding outwards, the first meshing lines are arc lines, the gear tooth grooves are provided with second meshing lines recessed inwards, and the second meshing lines are arc lines;

the synchronous belt comprises belt teeth and belt tooth grooves which are repeatedly distributed along the circumferential direction, wherein the cross section of the synchronous belt is provided with a third meshing line which protrudes outwards, the third meshing line is an arc line, the belt tooth grooves are provided with a fourth meshing line which is concave inwards, and the fourth meshing line is an arc line;

in the transmission process of the synchronous belt transmission structure, the third meshing line is meshed with the second meshing line, or the fourth meshing line is meshed with the first meshing line.

Optionally, at a complete engagement starting position of the double-sided arc gear and the synchronous belt, gear teeth of one double-sided arc gear are engaged with a toothed groove of the synchronous belt, and gear tooth grooves of the other double-sided arc gear are engaged with the toothed groove of the synchronous belt.

Optionally, at a complete engagement starting position where the double-sided circular arc gears are engaged with the synchronous belt, gear teeth of the two double-sided circular arc gears are engaged with toothed grooves of the synchronous belt, or gear tooth grooves of the two double-sided circular arc gears are engaged with toothed grooves of the synchronous belt.

Optionally, the radius of the fourth meshing line is slightly larger than the radius of the first meshing line, and/or the radius of the second meshing line is slightly larger than the radius of the third meshing line.

Optionally, the radius of the first meshing line is equal to the radius of the third meshing line, and the radius of the second meshing line is equal to the radius of the fourth meshing line.

Optionally, the double-sided circular gear includes only the gear teeth and the gear tooth grooves, and the synchronous belt includes only the belt teeth and the belt tooth grooves; on the cross section of the double-sided arc gear, the arc center of the first meshing line and the arc center of the second meshing line are the same as the distance between the centers of the double-sided arc gear; and on the cross section of the synchronous belt, the arc center of the third meshing line and the arc center of the fourth meshing line are at the same height.

Optionally, the double-sided arc gear further comprises a gear tooth connecting part between the gear teeth and the gear tooth grooves, and the synchronous belt further comprises a toothed connecting part between the toothed belt teeth and the toothed grooves; a first distance is arranged between the arc center of the first meshing line and the center of the double-sided arc gear, a second distance is arranged between the arc center of the second meshing line and the center of the double-sided arc gear, and the second distance is smaller than the first distance; on the cross section of the synchronous belt, the arc center of the third meshing line has a first height, and the arc center of the fourth meshing line has a second height, and the second height is smaller than the first height.

Optionally, on the cross section of the double-sided arc gear, the gear tooth connecting part comprises a first connecting line which is connected end to end and protrudes outwards and a second connecting line which is recessed inwards, the first connecting line is connected with the gear teeth, and the second connecting line is connected with the gear tooth groove; on the cross section of the synchronous belt, the toothed connecting part comprises a third connecting wire which is connected end to end and protrudes outwards and a fourth connecting wire which is recessed inwards, wherein the third connecting wire is connected with the toothed, and the fourth connecting wire is connected with the toothed groove; the first connecting line, the second connecting line, the third connecting line and the fourth connecting line are all arc lines.

Optionally, the first connecting line is an arc line co-rounded with the first meshing line, the second connecting line is an arc line co-rounded with the second meshing line, the third connecting line is an arc line co-rounded with the third meshing line, and the fourth connecting line is an arc line co-rounded with the fourth meshing line.

Optionally, the first meshing line, the second meshing line, the third meshing line and the fourth meshing line are all circular arcs with radian pi.

Optionally, the extending direction of the gear teeth is parallel to the axis of the double-sided circular arc gear, and the extending direction of the belt teeth is parallel to the normal line of the cross section of the synchronous belt; or a first included angle is formed between the extending direction of at least one part of the gear teeth and the axis of the double-sided circular arc gear, a second included angle is formed between the extending direction of at least one part of the toothed belt and the normal line of the cross section of the synchronous belt, and the first included angle and the second included angle are both larger than 0 degrees and smaller than 90 degrees.

Optionally, the extension path of the gear teeth is a curve, a broken line or a straight line; the extension path of the belt teeth is a curve, a broken line or a straight line.

Optionally, the synchronous belt transmission structure further comprises at least one transmission element and/or structural member, and the transmission element and/or structural member and the double-sided circular arc gear are integrally formed.

Optionally, the double-sided circular arc gear comprises at least two gear teeth.

The embodiment of the disclosure provides a synchronous belt transmission structure based on a double-sided circular gear, since on the cross section of the double-sided circular gear, the gear teeth are provided with first meshing lines protruding outwards, all first meshing lines form first meshing surfaces in the extending direction of the gear teeth, likewise, all second meshing lines form second meshing surfaces in the extending direction of the gear teeth, all third meshing lines form third meshing surfaces in the extending direction of the belt teeth, all fourth meshing lines form fourth meshing surfaces, in the transmission process of the synchronous belt transmission structure, the third meshing lines are meshed with the second meshing lines, or the fourth meshing lines are meshed with the first meshing lines, and for the whole synchronous belt transmission structure, the third meshing surfaces are meshed with the second meshing surfaces, or the fourth meshing surfaces are meshed with the first meshing surfaces, instead of involute meshing in the prior art, and gaps between a synchronous belt and the double-sided circular gear after the meshing surfaces are meshed can be effectively reduced or even eliminated; on the other hand, on the cross section, the meshing lines of the double-sided arc gear and the synchronous belt are arc lines, so that the undercut phenomenon does not exist, the double-sided arc gear and the synchronous belt can be processed in a milling mode, a standard processing center and a turning and milling compound numerical control machine tool are used, a large number of special customization is not needed for the cutter, the proofing time is greatly shortened, the dependence on special equipment is reduced, and the production cost is reduced; on the other hand, not only the belt teeth of the synchronous belt are meshed with the gear tooth grooves of the double-sided circular gears, but also the belt tooth grooves of the synchronous belt are meshed with the gear teeth of the double-sided circular gears, so that the reverse gap can be effectively reduced or even eliminated.

The foregoing description is only an overview of the disclosed technology, and may be implemented in accordance with the disclosure of the present disclosure, so that the above-mentioned and other objects, features and advantages of the present disclosure can be more clearly understood, and the following detailed description of the preferred embodiments is given with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

FIG. 1 is a cross-sectional view of a first timing belt drive structure provided in an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of a first double-sided circular arc gear provided by an embodiment of the present disclosure;

FIG. 3 is a perspective view of a first double-sided circular arc gear provided by an embodiment of the present disclosure;

fig. 4 is a partial enlarged view of a first timing belt provided in an embodiment of the present disclosure;

fig. 5 is a perspective view of a first timing belt provided in an embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of a second timing belt drive structure provided in an embodiment of the present disclosure;

FIG. 7 is an enlarged partial view of a first double-sided circular arc gear provided in an embodiment of the present disclosure;

FIG. 8 is an enlarged partial view of a second double-sided circular arc gear provided in an embodiment of the present disclosure;

FIG. 9 is a perspective view of a third double-sided circular arc gear provided by an embodiment of the present disclosure;

FIG. 10 is an enlarged partial view of a second timing belt provided in an embodiment of the present disclosure;

FIG. 11 is an enlarged view of a portion of a third timing belt drive structure provided in an embodiment of the present disclosure;

fig. 12 is a partial enlarged view of a fourth timing belt transmission structure provided in an embodiment of the present disclosure.

Detailed Description

The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.

In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The technical aspects of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Thus, unless otherwise indicated, features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present disclosure.

The use of cross-hatching and/or shading in the drawings is typically used to clarify the boundaries between adjacent components. As such, the presence or absence of cross-hatching or shading does not convey or represent any preference or requirement for a particular material, material property, dimension, proportion, commonality between illustrated components, and/or any other characteristic, attribute, property, etc. of a component, unless indicated. In addition, in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. While the exemplary embodiments may be variously implemented, the specific process sequences may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in reverse order from that described. Moreover, like reference numerals designate like parts.

When an element is referred to as being "on" or "over", "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements present. For this reason, the term "connected" may refer to physical connections, electrical connections, and the like, with or without intermediate components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "under … …," under … …, "" under … …, "" lower, "" above … …, "" upper, "" above … …, "" higher "and" side (e.g., as in "sidewall"), etc., to describe one component's relationship to another (other) component as illustrated in the figures. In addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features. Thus, the exemplary term "below" … … can encompass both an orientation of "above" and "below". Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising," and variations thereof, are used in the present specification, the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof is described, but the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximation terms and not as degree terms, and as such, are used to explain the inherent deviations of measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.

The present disclosure provides a synchronous belt transmission structure based on a double-sided circular gear (hereinafter referred to as synchronous belt transmission structure for short), specifically, as shown in fig. 1, fig. 1 is a cross-sectional view of a first synchronous belt transmission structure provided in the present disclosure, where the synchronous belt transmission structure includes a synchronous belt 10 and two double-sided circular gears 20 matched with the synchronous belt 10.

As shown in fig. 2 and 3, fig. 2 is a cross-sectional view of a first double-sided arc gear provided in an embodiment of the present disclosure, and fig. 3 is a perspective view of a first double-sided arc gear provided in an embodiment of the present disclosure, the double-sided arc gear 20 includes gear teeth 21 and gear tooth grooves 22 repeatedly arranged along a circumferential direction, the gear teeth 21 have first meshing lines a protruding outward, the first meshing lines a are arc lines, the gear tooth grooves 22 have second meshing lines B recessed inward, and the second meshing lines B are arc lines in the cross-section of the double-sided arc gear 20.

The double-sided arc gear 20 is characterized in that the first meshing line a and the second meshing line B are arc-shaped in cross section.

As shown in fig. 4 and 5, fig. 4 is a partial enlarged view of a first type of synchronous belt provided in an embodiment of the present disclosure, and fig. 5 is a perspective view of a first type of synchronous belt provided in an embodiment of the present disclosure, where the synchronous belt 10 includes teeth 11 and tooth grooves 12 repeatedly arranged along a circumferential direction, the teeth 11 have third meshing lines C protruding outward, the third meshing lines C are circular arcs, the tooth grooves 12 have fourth meshing lines D recessed inward, and the fourth meshing lines D are circular arcs.

As shown in fig. 1 to 5, during the transmission of the synchronous belt transmission structure, the third meshing line C meshes with the second meshing line B, or the fourth meshing line D meshes with the first meshing line a.

In the embodiment of the present disclosure, the size of the two double-sided arc gears 20 included in the synchronous belt transmission structure is not limited, and a person skilled in the art may select two double-sided arc gears 20 of the same size or different sizes according to actual needs.

The synchronous belt transmission structure based on the double-sided arc gear 20 has at least the following technical advantages:

on the one hand, since the gear teeth 21 have the first meshing line a protruding outward in the cross section of the double-sided circular gear 20, all the first meshing lines a form the first meshing surface in the extending direction of the gear teeth 21, and likewise all the second meshing lines B form the second meshing surface in the extending direction of the gear teeth 21, all the third meshing lines C form the third meshing surface in the extending direction of the belt teeth 11, and all the fourth meshing lines D form the fourth meshing surface, during the transmission of the synchronous belt transmission structure, the third meshing line C meshes with the second meshing line B, or the fourth meshing line D meshes with the first meshing line a, so that for the whole synchronous belt transmission structure, the third meshing surface meshes with the second meshing surface, or the fourth meshing surface meshes with the first meshing surface, instead of involute in the prior art, the gap between the synchronous belt and the double-sided circular gear after the meshing surfaces mesh can be effectively reduced or even eliminated;

on the other hand, on the cross section, the meshing lines of the double-sided arc gear 20 and the synchronous belt 10 are arc lines, so that the undercut phenomenon does not exist, the double-sided arc gear 20 and the synchronous belt 10 can be processed in a milling mode, a standard machining center and a turning and milling compound numerical control machine tool are used, a large number of special customization is not needed for a cutter, the proofing time is greatly shortened, the dependence on special equipment is reduced, and the production cost is reduced;

on the other hand, not only the belt teeth 11 of the timing belt 10 are engaged with the tooth grooves 22 of the double-sided circular gear 20, but also the belt tooth grooves 12 of the timing belt 10 are engaged with the tooth teeth 21 of the double-sided circular gear 20, so that the backlash can be effectively reduced or even eliminated.

On the other hand, with the same number of teeth, the size of the development of the engagement surface of the timing belt 10 is the same as or very close to the size of the development of the engagement surface of the double-sided circular arc gear 20, and therefore both approach rolling friction during engagement, and frictional resistance is greatly reduced compared with gears and timing belts in the related art.

In addition, it should be added that the double-sided circular gear 20 and the synchronous belt 10 applied in the embodiment of the present disclosure have the following technical advantages: the surface is worn in the transmission process, the contact area is increased, the wear resistance is improved, the service life is further effectively prolonged, the tooth shape of the gear teeth and the toothed tooth is firmer, the gear teeth and the toothed tooth shape can be made bigger and firmer under the same modulus, and the strength and the wear resistance are improved; the stress is uniform; the contact area is large, and the wear resistance is improved; by tightly meshing the meshing surfaces, the running precision is improved, the stressed area is doubled or even higher than that of the prior art, and the bearing capacity is improved; and the measurement accuracy error is convenient.

In the embodiment of the present disclosure, there may be various ways of matching the two double-sided circular gears 20 with the synchronous belt 10, for example:

first, as shown in fig. 1, taking the transmission direction as the Y direction as an example in fig. 1, at the fully engaged starting position of the double-sided circular gears 20 engaged with the synchronous belt 10, i.e., the position of the double-sided circular gears 20 fully engaged with the synchronous belt 10 for the first time in the transmission direction Y direction (the position shown by the broken line circle in fig. 1), the teeth 21 of one double-sided circular gears 20 are engaged with the tooth grooves 12 of the synchronous belt 10 (the convex-concave shape, the left broken line circle in fig. 1), i.e., the first engagement line a of the double-sided circular gears 20 is engaged with the fourth engagement line D of the synchronous belt 10, and the tooth grooves 22 of the other double-sided circular gears 20 are engaged with the teeth 11 of the synchronous belt 10 (the concave-convex shape, the right broken line circle in fig. 1), i.e., the second engagement line B of the double-sided circular gears 20 is engaged with the third engagement line C of the synchronous belt 10. Based on the above, in the transmission process of the synchronous belt transmission structure, the meshing positions between the two double-sided circular gears 20 and the synchronous belt 10 are just opposite, and the reverse gap can be further reduced or eliminated while realizing the technical advantages described earlier.

Second, as shown in fig. 6, fig. 6 is a cross-sectional view of a second synchronous belt transmission structure provided in the embodiment of the present disclosure, taking a transmission direction as an example in a Y direction in fig. 6, in a fully engaged starting position (a position shown by a dotted circle in fig. 6) where the double-sided arc gears 20 are engaged with the synchronous belt 10, the gear teeth 21 of the two double-sided arc gears 20 are engaged with the toothed grooves 12 of the synchronous belt 10 (both are convex-concave, and shown by a dotted circle in fig. 6), the two double-sided arc gears 20 are engaged with the fourth meshing line D of the synchronous belt 10, or the gear tooth grooves 22 of the two double-sided arc gears 20 are engaged with the toothed grooves 11 of the synchronous belt 10 (both are concave-convex), and the two double-sided arc gears 20 are engaged with the third meshing line C of the synchronous belt 10. Based on the above, in the transmission process of the synchronous belt transmission structure, the meshing parts between the two double-sided circular gears 20 and the synchronous belt 10 are the same, so that the technical advantages described above can be further enhanced.

In embodiments of the present disclosure, the radii of the engagement lines may have the following relationship: the radius of the fourth meshing line D may be slightly greater than or equal to the radius of the first meshing line a, the radius of the second meshing line B may be slightly greater than or equal to the radius of the third meshing line C, the radius of the first meshing line a is greater than, equal to, or less than the radius of the third meshing line C, and the radius of the second meshing line B is greater than, equal to, or less than the radius of the fourth meshing line D.

Optionally, in an embodiment of the present disclosure, the radius of the fourth meshing line D is slightly larger than the radius of the first meshing line a, and/or the radius of the second meshing line B is slightly larger than the radius of the third meshing line C. The effect of the above "slightly larger" is that the first engaging line a can smoothly engage with and disengage from the fourth engaging line D, so as to avoid seizing, and the third engaging line C can smoothly engage with and disengage from the second engaging line B, so as to avoid seizing. The size range of "slightly greater" can be selected by those skilled in the art according to actual needs, in order to achieve simultaneous engagement of the engagement lines and avoid seizing. For example, the radius of the fourth meshing line D is 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, etc. greater than the radius of the first meshing line A; the radius of the second meshing line B is 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, etc. larger than the radius of the third meshing line C.

Further, in the embodiment of the present disclosure, the radius of the first meshing line a is equal to the radius of the third meshing line C, and the radius of the second meshing line B is equal to the radius of the fourth meshing line D, that is, the sizes of the gear teeth 21 and the gear tooth grooves 22 on the double-sided circular gear 20 are similar, and the sizes of the belt teeth 11 and the belt tooth grooves 12 on the synchronous belt 10 are similar.

Alternatively, as shown in fig. 2 and 7, fig. 7 is a partial enlarged view of a first double-sided arc gear 20 provided in the embodiment of the present disclosure, in which the double-sided arc gear 20 includes only the gear teeth 21 and the gear tooth grooves 22, and the synchronous belt 10 includes only the belt teeth 11 and the belt tooth grooves 12, then correspondingly, the distances between the arc center of the first meshing line a (indicated by the upper right black dot in fig. 2) and the arc center of the second meshing line B (indicated by the lower right black dot in fig. 2) are d, that is, in the orientation shown in fig. 2, the arc center of the first meshing line a and the arc center of the second meshing line B are on the same circumference centered on the center of the double-sided arc gear 20; as shown in fig. 4, in the cross section of the timing belt (specifically, in the illustrated direction Z), the arc center of the third meshing line C and the arc center of the fourth meshing line D are at the same height, and the direction Z is perpendicular to the transmission direction (Y direction) of the timing belt 10. In this case, in the transmission process of the synchronous belt transmission structure, the operation is stable and the vibration is small.

Alternatively, as shown in fig. 8, fig. 8 is a partial enlarged view of a second double-sided arc gear structure provided in an embodiment of the present disclosure, in which the double-sided arc gear 20 further includes a gear tooth connection portion 23 located between the gear tooth 21 and the gear tooth groove 22, then correspondingly, a first distance is provided between an arc center (indicated by a left black dot in fig. 8) of the first meshing line a and a center (not shown in fig. 8) of the double-sided arc gear 20, and a second distance is provided between an arc center (indicated by a right black dot in fig. 8) of the second meshing line B and the center of the double-sided arc gear 20, the second distance being smaller than the first distance, that is, in an orientation of a cross section of the double-sided arc gear 20, the arc center of the first meshing line a and the arc center of the second meshing line B are located on different circumferences centered on the center of the double-sided arc gear 20. Similarly, the timing belt 10 further comprises a toothed connection 13 between the toothed 11 and the toothed slot 12, the axis of the third meshing line C having a first height in the cross section of the timing belt 10 (in particular in the direction Z) and the axis of the fourth meshing line D having a second height, which is smaller than the first height. In this case, there are effects of speed change and vibration during the transmission of the timing belt transmission structure.

Alternatively, as shown in fig. 8, the double-sided circular arc gear 20 includes a gear tooth connecting portion 23 including a first connecting line 231 protruding outward and a second connecting line 232 recessed inward, which are connected end to end, the first connecting line 231 being connected to the gear tooth 21, and the second connecting line 232 being connected to the gear tooth groove 22. Similarly, the toothed connection 13 of the timing belt 10 includes an outwardly convex third connection line connected with the belt teeth 11 and an inwardly concave fourth connection line connected with the belt tooth grooves 12, which are connected end to end. The first connection line 231, the second connection line 232, the third connection line, and the fourth connection line are all arcs. With the above configuration of the cogged coupler 23 and the toothed coupler 13, the meshing area between the timing belt 10 and the double-sided circular gear 20 can be further increased.

Further, as shown in fig. 8, in the embodiment of the present disclosure, the first connection line 231 of the cogged coupler 23 is an arc line co-rounded with the first meshing line a; the second connecting line 232 is an arc line co-circular with the second meshing line B. The third connecting line of the toothed connecting portion 13 is an arc line co-circular with the third meshing line C, and the fourth connecting line is an arc line co-circular with the fourth meshing line. In this case, during the transmission of the timing belt transmission structure, the first connection line 231 may be engaged with the fourth connection line and/or the second connection line 232 may be engaged with the third connection line, thereby further increasing the engagement area between the double-sided circular arc gear 20 and the timing belt 10.

Optionally, in the embodiment of the present disclosure, the first meshing line a, the second meshing line B, the third meshing line C, and the fourth meshing line D are arc lines with an arc degree pi, that is, half of the entire circumference, so as to further increase the meshing area between the synchronous belt 10 and the double-sided circular gear 20.

Alternatively, the double-sided circular gear 20 in the embodiment of the present disclosure may be a spur gear, or a helical gear, and the synchronous belt 10 may be a spur synchronous belt, or a helical synchronous belt. That is, as shown in fig. 3 and 5, in the embodiment of the present disclosure, the extending direction of the gear teeth 21 (shown by a broken line in fig. 3) is parallel to the axis (shown by a direction X) of the double-sided circular arc gear 20, and the extending direction of the belt teeth 11 (shown by a broken line in fig. 5) is parallel to the normal (shown by a direction F in fig. 5) of the cross section of the timing belt 10; or, as shown in fig. 9 and 10, fig. 9 is a perspective view of a third double-sided arc gear provided in an embodiment of the present disclosure, fig. 10 is a partial enlarged view of a second synchronous belt provided in an embodiment of the present disclosure, a first included angle is formed between an extending direction of at least a portion of the gear teeth 21 and an axis of the double-sided arc gear 20, a second included angle is formed between an extending direction of at least a portion of the belt teeth 11 and a normal line of a cross section of the synchronous belt 10, and the first included angle and the second included angle are both greater than 0 ° and less than 90 °, and may be further selected to be 10 ° to 45 °.

Further, the extending path of the gear teeth 21 in the embodiment of the present disclosure is a curve (such as an arc), a broken line (such as a herringbone), or a straight line; the extension path of the belt teeth 11 is a curve, a broken line or a straight line. It will be understood by those skilled in the art that the extension path of the teeth 21 and the extension path of the belt teeth 11 are matched. In the example shown in fig. 11, fig. 11 is a partial enlarged view of a third synchronous belt transmission structure provided in the embodiment of the present disclosure, the extension paths of the gear teeth 21 and the belt teeth 11 are all straight lines, and in the example shown in fig. 12, fig. 12 is a partial enlarged view of a fourth synchronous belt transmission structure provided in the embodiment of the present disclosure, the extension paths of the gear teeth 21 and the belt teeth 11 are all herringbone folding lines.

Optionally, the synchronous belt drive structure in the embodiments of the present disclosure further includes at least one drive element and/or structure integrally formed with the double-sided circular gear 20. For example, in the example shown in fig. 3, the timing belt transmission structure further includes a gear drive shaft 30, and the gear drive shaft 30 is integrally formed with the double-sided circular gear 20. The above transmission elements may be any structure such as gears, gear rings, racks, and driving shafts, the shape of which may be regular or irregular, the structural members may be any structural member, and the positional relationship (up-down, left-right, inside-out, coaxial or not, etc.), the size relationship (equal or unequal), etc. between each transmission element and each structural member and the double-sided circular gear 20 may be various, and the present application is not limited thereto, and those skilled in the art may select according to actual needs.

Since the double-sided circular arc gear 20 in the embodiments of the present disclosure may be machined by milling, the transmission elements and/or structural members of the gear drive shaft 30, etc. may be integrally formed with the double-sided circular arc gear 20. Of course, when other parts are needed to be matched with the double-sided arc gear, the double-sided arc gear and the double-sided arc gear can be made into an integral part, the number of assembly stages is reduced, the number of parts is greatly reduced, the number of assembly stages is greatly reduced, the multi-stage assembly precision error is greatly reduced, various comprehensive instabilities are greatly reduced, the number of fasteners or positioning parts is also greatly reduced, and the integral part has stronger rigidity, stronger integral structure precision and retentivity.

The prior art old-fashioned gears are limited by several conventional processing methods, such as making other parts on the gears into separate parts, and then assembling the separate parts. When each stage of assembly is assembled, precision errors (concentricity, cylindricity, position degree, verticality, levelness, parallelism and the like) are generated, the errors can be accumulated along with the increase of part cooperation, or single parts are possibly qualified, and the whole multi-layer multi-stage assembly is disqualified to cause precision super tolerance, so that various comprehensive instabilities are generated; the multi-stage assembly needs to use a fastener or a positioning piece, or the working time is increased along with the time, the precision retention degree of the multi-stage assembly overall structure is reduced, and the rigidity is reduced.

Optionally, the double-sided circular gear 20 in the disclosed embodiment includes at least two gear teeth 21, e.g., 2, 3, 4, 5, 8, 10, 15, 20, etc., with a wider range of selectable numbers of gear teeth 21. The gears in the prior art are involute gears, if the number of gear teeth is small, the undercut problem can occur, and the meshing line of the double-sided arc gear 20 in the embodiment of the disclosure is an arc line, so that the undercut problem can not occur no matter a plurality of gear teeth 21 are arranged.

In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.

Claims (14)

1. The synchronous belt transmission structure based on the double-sided arc gears is characterized by comprising a synchronous belt and two double-sided arc gears matched with the synchronous belt;

the double-sided arc gear comprises gear teeth and gear tooth grooves which are repeatedly arranged along the circumferential direction, wherein on the cross section of the double-sided arc gear, the gear teeth are provided with first meshing lines protruding outwards, the first meshing lines are arc lines, the gear tooth grooves are provided with second meshing lines recessed inwards, and the second meshing lines are arc lines;

the synchronous belt comprises belt teeth and belt tooth grooves which are repeatedly distributed along the circumferential direction, wherein the cross section of the synchronous belt is provided with a third meshing line which protrudes outwards, the third meshing line is an arc line, the belt tooth grooves are provided with a fourth meshing line which is concave inwards, and the fourth meshing line is an arc line;

in the transmission process of the synchronous belt transmission structure, the third meshing line is meshed with the second meshing line, or the fourth meshing line is meshed with the first meshing line.

2. The timing belt transmission structure according to claim 1, wherein in a fully engaged start position where the double-sided circular gears are engaged with the timing belt, teeth of one of the double-sided circular gears are engaged with tooth grooves of the timing belt, and teeth grooves of the other double-sided circular gears are engaged with the tooth grooves of the timing belt.

3. The timing belt transmission structure according to claim 1, wherein in a fully engaged start position where the double-sided circular arc gears are engaged with the timing belt, teeth of two of the double-sided circular arc gears are engaged with tooth grooves of the timing belt, or teeth grooves of two of the double-sided circular arc gears are engaged with the teeth of the timing belt.

4. A synchronous belt drive according to any one of claims 1-3, characterized in that the radius of the fourth meshing line is slightly larger than the radius of the first meshing line and/or the radius of the second meshing line is slightly larger than the radius of the third meshing line.

5. The timing belt drive of claim 4 wherein the radius of the first meshing line is equal to the radius of the third meshing line and the radius of the second meshing line is equal to the radius of the fourth meshing line.

6. The timing belt transmission structure according to any one of claims 1 to 3, wherein the double-sided circular-arc gear includes only the teeth and the tooth grooves, and the timing belt includes only the belt teeth and the belt tooth grooves; on the cross section of the double-sided arc gear, the arc center of the first meshing line and the arc center of the second meshing line are the same as the distance between the centers of the double-sided arc gear; and on the cross section of the synchronous belt, the arc center of the third meshing line and the arc center of the fourth meshing line are at the same height.

7. The timing belt transmission structure as claimed in any one of claims 1 to 3, wherein the double-sided circular arc gear further includes a tooth connection portion between the tooth and the tooth groove, the timing belt further including a toothed connection portion between the toothed and the tooth groove; a first distance is arranged between the arc center of the first meshing line and the center of the double-sided arc gear, a second distance is arranged between the arc center of the second meshing line and the center of the double-sided arc gear, and the second distance is smaller than the first distance; on the cross section of the synchronous belt, the arc center of the third meshing line has a first height, and the arc center of the fourth meshing line has a second height, and the second height is smaller than the first height.

8. The timing belt transmission structure according to claim 7, wherein the cog connecting section includes, in a cross section of the double-sided circular arc gear, a first connecting wire protruding outward and a second connecting wire recessed inward, which are connected end to end, the first connecting wire being connected to the cog, the second connecting wire being connected to the cog groove; on the cross section of the synchronous belt, the toothed connecting part comprises a third connecting wire which is connected end to end and protrudes outwards and a fourth connecting wire which is recessed inwards, wherein the third connecting wire is connected with the toothed, and the fourth connecting wire is connected with the toothed groove; the first connecting line, the second connecting line, the third connecting line and the fourth connecting line are all arc lines.

9. The timing belt transmission structure of claim 8, wherein the first connecting line is an arc line co-circular with the first meshing line, the second connecting line is an arc line co-circular with the second meshing line, the third connecting line is an arc line co-circular with the third meshing line, and the fourth connecting line is an arc line co-circular with the fourth meshing line.

10. The timing belt transmission structure as in any one of claims 1-3, wherein the first meshing line, the second meshing line, the third meshing line, and the fourth meshing line are arc lines of a circle having an arc of pi.

11. A timing belt transmission structure in accordance with any one of claims 1 to 3, wherein an extending direction of the gear teeth is parallel to an axis of the double-sided circular arc gear, and an extending direction of the belt teeth is parallel to a normal line of a cross section of the timing belt; or a first included angle is formed between the extending direction of at least one part of the gear teeth and the axis of the double-sided circular arc gear, a second included angle is formed between the extending direction of at least one part of the toothed belt and the normal line of the cross section of the synchronous belt, and the first included angle and the second included angle are both larger than 0 degrees and smaller than 90 degrees.

12. The timing belt drive of claim 11 wherein the path of extension of the gear teeth is a curve, a fold line, or a straight line; the extension path of the belt teeth is a curve, a broken line or a straight line.

13. The timing belt transmission structure of any one of claims 1-4, further comprising at least one transmission element and/or structural member integrally formed with the double-sided circular gear.

14. The timing belt transmission structure as in any one of claims 1-4, wherein the double sided circular arc gear comprises at least two gear teeth.