CN218063263U - 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-faced circular arc gear. The synchronous belt transmission structure based on the double-sided circular arc gear comprises a synchronous belt and two double-sided circular 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 a first meshing line which protrudes outwards on the cross section of the double-sided arc gear, the first meshing line is an arc line, the gear tooth grooves are provided with a second meshing line which is recessed inwards, and the second meshing line is an arc line; the synchronous belt comprises belt teeth and belt tooth grooves which are repeatedly arranged along the circumferential direction, the belt teeth are provided with a third meshing line which protrudes outwards on the cross section of the synchronous belt, the third meshing line is an arc line, the belt tooth grooves are provided with a fourth meshing line which is recessed 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 utility model relates to a mechanical structure technical field especially relates to a hold-in range transmission structure based on double-sided circular arc gear.

Background

The synchronous belt transmission is formed by a synchronous belt and a gear structure (or called synchronous belt wheel) which are matched with the synchronous belt, wherein the inner peripheral surface of the synchronous belt is provided with tooth shapes at equal intervals. When the gear rotates, the belt teeth are meshed with the gear tooth grooves of the gear to transmit power.

In the prior art, the belt teeth are generally trapezoidal teeth, and the gear tooth socket and the gear tooth of the gear matched with the belt teeth are also trapezoidal teeth, and the inventor finds that the above structure at least has the following problems of influencing the transmission effect of the synchronous belt: trapezoidal teeth in the synchronous belt and the gear are difficult to process; an undercut phenomenon exists; a gap exists between the synchronous belt and the gear structure in the matching process; a reverse gap.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present disclosure provides a synchronous belt transmission structure based on a double-sided circular arc gear, which at least partially solves the problem that a synchronous belt transmission effect in the prior art 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 circular arc gear comprises a synchronous belt and two double-sided circular 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 a first meshing line which protrudes outwards on the cross section of the double-sided arc gear, the first meshing line is an arc line, the gear tooth grooves are provided with a second meshing line which is recessed inwards, and the second meshing line is an arc line;

the synchronous belt comprises belt teeth and belt tooth grooves which are repeatedly arranged along the circumferential direction, the belt teeth are provided with a third meshing line which protrudes outwards on the cross section of the synchronous belt, the third meshing line is an arc line, the belt tooth grooves are provided with a fourth meshing line which is recessed 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, the double-sided arc gear with the complete meshing initial position of hold-in range meshing, one the teeth of a cogwheel of double-sided arc gear with the area tooth's socket meshing of hold-in range, another the teeth of a cogwheel groove of double-sided arc gear with the area tooth meshing of hold-in range.

Optionally, the double-sided circular arc gear with the complete meshing initial position of hold-in range meshing, two the teeth of a cogwheel of double-sided circular arc gear with the tooth's socket meshing of hold-in range, perhaps, two the teeth of a cogwheel groove of double-sided circular arc gear with the tooth's of hold-in range meshes.

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

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

Optionally, the double-sided circular arc gear comprises only the gear teeth and the gear tooth grooves, and the synchronous belt comprises only the gear teeth and the belt tooth grooves; on the cross section of the double-sided arc gear, the distance between the arc center of the first meshing line and the arc center of the second meshing line and the center of the double-sided arc gear is the same; 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 circular arc gear further comprises a gear tooth connecting part located between the gear tooth and the gear tooth groove, and the synchronous belt further comprises a toothed connecting part located between the belt tooth and the belt tooth groove; on the cross section of the double-sided circular arc gear, a first distance is reserved between the arc center of the first meshing line and the center of the double-sided circular arc gear, a second distance is reserved between the arc center of the second meshing line and the center of the double-sided circular arc gear, and the second distance is smaller than the first distance; in the cross section of the synchronous belt, the arc center of the third meshing line has a first height, 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 circular 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 connected with the gear tooth groove and is recessed inwards; on the cross section of the synchronous belt, the toothed connecting part comprises a third connecting line which is convex outwards and a fourth connecting line which is concave inwards, the third connecting line is connected with the toothed belt, and the fourth connecting line 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 arcs.

Optionally, the first connecting line is a circular arc line that is concentric with the first meshing line, the second connecting line is a circular arc line that is concentric with the second meshing line, the third connecting line is a circular arc line that is concentric with the third meshing line, and the fourth connecting line is a circular arc line that is concentric 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 arc lines with a radian pi.

Optionally, 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 of a cross section of the synchronous belt; or, the extending direction of at least part of the teeth of a cogwheel with first contained angle has between the axis of double-sided circular arc gear, the extending direction of at least part of the tooth with the second contained angle has between the normal of the cross section of hold-in range, first contained angle with the second contained angle all is greater than 0 and is less than 90.

Optionally, the extending 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 drive structure further comprises at least one drive element and/or a structural member, and the drive element and/or the 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 arc gear, because on the cross section of the double-sided arc gear, a gear tooth has a first meshing line protruding outwards, all the first meshing lines in the extending direction of the gear tooth form a first meshing surface, similarly, all the second meshing lines in the extending direction of the gear tooth form a second meshing surface, all the third meshing lines in the extending direction of the gear tooth form a third meshing surface, all the fourth meshing lines form a fourth meshing surface, during 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, both are meshed with the second meshing surfaces through the third meshing surfaces, or the fourth meshing surfaces are meshed with the first meshing surfaces, but not the involute meshing in the prior art, and the gap between the synchronous belt and the double-sided arc 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 an undercut phenomenon does not exist, the double-sided arc gear and the synchronous belt can be machined in a milling mode, a standard machining center and a turning and milling composite numerical control machine tool are used, a large number of special customizations are 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, the belt teeth of the synchronous belt are meshed with the gear tooth grooves of the double-faced circular arc gear, and the belt tooth grooves of the synchronous belt can be meshed with the gear teeth of the double-faced circular arc gear, so that reverse gaps can be effectively reduced or even eliminated.

The foregoing is a summary of the present disclosure, and for the purposes of promoting a clear understanding of the technical means of the present disclosure, the present disclosure may be embodied in other specific forms without departing from the spirit or essential attributes thereof.

Drawings

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

Fig. 1 is a cross-sectional view of a first synchronous belt drive configuration provided by an embodiment of the present disclosure;

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

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

fig. 4 is a partially enlarged view of a first synchronous belt provided by the embodiment of the 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 synchronous belt drive configuration provided by an embodiment of the present disclosure;

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

fig. 8 is a partially enlarged 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 in the embodiment of the present disclosure;

figure 10 is an enlarged partial view of a second synchronous belt provided by an embodiment of the present disclosure;

FIG. 11 is an enlarged view of a portion of a third synchronous belt drive configuration provided by an embodiment of the present disclosure;

fig. 12 is a partial enlarged view of a fourth synchronous belt drive configuration provided by an embodiment of the present disclosure.

Detailed Description

The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Unless otherwise indicated, the illustrated exemplary embodiments/examples 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, the features of the various embodiments/examples may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.

The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.

When an element is referred to as being "on" or "on," "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 purposes of this disclosure, the term "connected" may refer to physically connected, electrically connected, and the like, with or without intervening components.

For descriptive purposes, the present disclosure may use spatially relative terms such as "under 8230; \8230;,"' under 8230; \8230; below 8230; under 8230; above, on, above 8230; higher "and" side (e.g., as in "side wall)", etc., to describe the relationship of one component to another (other) component as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "at 8230; \8230;" below "may encompass both an orientation of" above "and" below ". Further, the devices 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 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 this specification, the presence of stated features, integers, steps, operations, elements, components and/or groups thereof are stated but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as degree terms, and as such, are used to interpret inherent deviations in measured values, calculated values, and/or provided values that would be recognized by one of ordinary skill in the art.

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

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

The double-sided circular arc gear 20 indicates that the first meshing line a and the second meshing line B are both circular arc-shaped in the cross section thereof.

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

As shown in fig. 1 to 5, during the driving of the synchronous belt driving 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 sizes of the two double-sided circular arc gears 20 included in the synchronous belt transmission structure are not limited, and a person skilled in the art can select two double-sided circular arc gears 20 having the same size or different sizes according to actual needs.

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

on one hand, since the gear teeth 21 have the first meshing line a protruding outward in the cross section of the double-sided circular arc gear 20, all the first meshing lines a in the extending direction of the gear teeth 21 form a first meshing surface, similarly, all the second meshing lines B in the extending direction of the gear teeth 21 form a second meshing surface, all the third meshing lines C in the extending direction of the belt teeth 11 form a third meshing surface, and all the fourth meshing lines D form a fourth meshing surface, and during the transmission of the synchronous belt transmission structure, the third meshing lines C mesh with the second meshing lines B, or the fourth meshing lines D mesh with the first meshing lines a, both of which mesh with the second meshing surface, or the fourth meshing surface meshes with the first meshing surface, rather than the involute meshing in the prior art, and the gap between the synchronous belt and the double-sided circular arc 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 an 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 processing center and a turning and milling composite numerical control machine tool are used, a large number of special customization are 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 synchronous belt 10 are meshed with the gear teeth grooves 22 of the double-sided circular arc gear 20, but also the belt teeth grooves 12 of the synchronous belt 10 are meshed with the gear teeth 21 of the double-sided circular arc gear 20, so that the reverse clearance can be effectively reduced or even eliminated.

On the other hand, under the same number of teeth, the size of the meshing surface of the synchronous belt 10 is the same as or very close to the size of the meshing surface of the double-sided circular arc gear 20, so that the two approach to rolling friction in the meshing process, and the friction resistance is greatly reduced compared with the gear and the synchronous belt in the prior art.

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

In the embodiment of the present disclosure, the two double-sided circular arc gears 20 and the synchronous belt 10 may be matched in various ways, for example:

first, as shown in fig. 1, taking the transmission direction as the Y direction in fig. 1 as an example, at a complete meshing start position where the double-sided circular arc gear 20 and the synchronous belt 10 are meshed, that is, at a position where the double-sided circular arc gear 20 and the synchronous belt 10 are firstly completely meshed (a position indicated by a dotted circle in fig. 1) in the transmission direction Y direction, the teeth 21 of one double-sided circular arc gear 20 are meshed with the belt tooth grooves 12 of the synchronous belt 10 (convex to concave, indicated by a left dotted circle in fig. 1), that is, a first meshing line a of the double-sided circular arc gear 20 is meshed with a fourth meshing line D of the synchronous belt 10, and the teeth 22 of the other double-sided circular arc gear 20 are meshed with the belt teeth 11 of the synchronous belt 10 (concave to convex, indicated by a right dotted circle in fig. 1), that is, a second meshing line B of the double-sided circular arc gear 20 is meshed with a third meshing line C of the synchronous belt 10. Based on the above situation, in the transmission process of the synchronous belt transmission structure, the meshing positions between the two double-sided circular arc gears 20 and the synchronous belt 10 are just opposite, and the reverse clearance can be further reduced or eliminated while the technical advantages described above are realized.

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

In the embodiment of the present disclosure, the radii of the meshing 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 the embodiment of the present disclosure, a radius of the fourth meshing line D is slightly larger than a radius of the first meshing line a, and/or a radius of the second meshing line B is slightly larger than a radius of the third meshing line C. The above "slightly larger" has an effect that the first meshing line a can smoothly be engaged with and disengaged from the fourth meshing line D to avoid seizure, and the third meshing line C can smoothly be engaged with and disengaged from the second meshing line B to avoid seizure. The size range slightly larger than the above size range can be selected by a person skilled in the art according to actual needs, so that the meshing line engagement and the jamming avoidance can be realized at the same time. For example, the radius of the fourth meshing line D is 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, etc. larger than the radius of the first meshing line A; the radius of the second meshing line B is larger than that of the third meshing line C by 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, etc.

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 teeth 21 and the tooth grooves 22 on the double-sided circular arc 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 partially enlarged view of a first double-sided circular arc gear 20 provided in the embodiment of the present disclosure, the double-sided circular arc gear 20 only includes a gear tooth 21 and a gear tooth slot 22, and the synchronous belt 10 only includes a gear tooth 11 and a gear tooth slot 12, and accordingly, the distance between the arc center of the first meshing line a (indicated by the upper black dot on the right side in fig. 2) and the arc center of the second meshing line B (indicated by the lower black dot on the right side in fig. 2) is the same as the distance between the centers of the double-sided circular arc gears 20 (indicated by the central black dot in fig. 2), which are both 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 with the center of the double-sided circular arc gear 20 as the center; as shown in fig. 4, in the cross section of the timing belt (specifically, in the direction Z shown in the drawing), 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. Under the condition, the synchronous belt transmission structure has stable operation and small vibration in the transmission process.

Alternatively, as shown in fig. 8, fig. 8 is a partially enlarged view of a second double-sided circular arc gear structure provided in the embodiment of the present disclosure, the double-sided circular arc gear 20 further includes a gear tooth connecting portion 23 located between the gear tooth 21 and the gear tooth slot 22, and accordingly, 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 circular 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 circular arc gear 20, where the second distance is smaller than the first distance, that is, in an orientation of a cross section of the double-sided circular arc gear 20, the arc center of the first meshing line a and the arc center of the second meshing line B are on different circumferences with the center of the double-sided circular arc gear 20 as a center. Similarly, the timing belt 10 further includes a belt tooth connecting portion 13 between the belt tooth 11 and the belt tooth groove 12, and an axis of the third meshing line C has a first height and an axis of the fourth meshing line D has a second height smaller than the first height in a cross section of the timing belt 10 (specifically, in the direction Z). In this case, there are speed change and vibration effects during the driving of the synchronous belt driving 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 in an end-to-end relationship, 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 connecting portion 13 of the timing belt 10 includes a third connecting line protruding outward and a fourth connecting line recessed inward in an end-to-end connection, the third connecting line being connected to the belt teeth 11, and the fourth connecting line being connected to the belt tooth grooves 12. The first connection line 231, the second connection line 232, the third connection line and the fourth connection line are all arcs. When the gear tooth connecting portion 23 and the toothed connecting portion 13 have the above structure, the meshing area between the timing belt 10 and the double-sided circular arc gear 20 can be further increased.

Further, as shown in fig. 8, in the embodiment of the present disclosure, the first connecting line 231 of the gear tooth connecting portion 23 is an arc line that is concentric with the first meshing line a; the second connecting line 232 is a circular arc line which is concentric with the second meshing line B. The third connecting line of the toothed connecting portion 13 is a circular arc line which is concentric with the third meshing line C, and the fourth connecting line is a circular arc line which is concentric with the fourth meshing line C. In this case, 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 during the driving of the synchronous belt driving structure, thereby further increasing the engagement area between the double-sided circular arc gear 20 and the synchronous 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 all circular arc lines with a radian 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 arc gear 20.

Optionally, the double-sided circular arc gear 20 in the embodiment of the present disclosure may be a straight gear, or may also be a helical gear, and the synchronous belt 10 may be a straight toothed synchronous belt, or may also be a helical toothed synchronous belt. That is, as shown in fig. 3 and 5, in the embodiment of the present disclosure, the extending direction (shown by a dotted line in fig. 3) of the gear tooth 21 is parallel to the axis (shown by direction X) of the double-sided circular arc gear 20, and the extending direction (shown by a dotted line in fig. 5) of the belt tooth 11 is parallel to the normal (shown by 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 circular arc gear provided in the embodiment of the present disclosure, and fig. 10 is a partial enlarged view of a second synchronous belt provided in the 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 circular arc gear 20, a second included angle is formed between an extending direction of at least a portion of the gear teeth 11 and a normal of a cross section of the synchronous belt 10, and both the first included angle and the second included angle are greater than 0 ° and smaller than 90 °, and may be further selected from 10 ° to 45 °.

Further, in the disclosed embodiment, the extending path of gear teeth 21 is curved (e.g., arc), curved (e.g., chevron), or straight; the extension path of the belt teeth 11 is curved, broken or straight. It will be understood by those skilled in the art that the path of the teeth 21 and the path of the belt teeth 11 will match. In the example shown in fig. 11, fig. 11 is a partially enlarged view of the third synchronous belt drive structure provided by the embodiment of the present disclosure, and the extending paths of the gear teeth 21 and the belt teeth 11 are both straight lines, and in the example shown in fig. 12, fig. 12 is a partially enlarged view of the fourth synchronous belt drive structure provided by the embodiment of the present disclosure, and the extending paths of the gear teeth 21 and the belt teeth 11 are both herringbone broken lines.

Optionally, the synchronous belt drive structure in the embodiment of the present disclosure further includes at least one driving element and/or a structural member, which is integrally formed with the double-sided circular arc gear 20. For example, in the example shown in fig. 3, the synchronous belt drive structure further includes a gear drive shaft 30, and the gear drive shaft 30 is integrally formed with the double-sided circular arc gear 20. The transmission elements can be any structure such as gears, gear rings, racks, driving shafts and the like, the shape of the transmission elements can be regular or irregular, the structural parts can be any parts which can have structural functions, the position relationship (up-down, left-right, inside-outside, coaxial or not) and the size relationship (equal, unequal) of the transmission elements and the structural parts and the double-sided arc gears 20 can be various, the position relationship is not limited in the above, and the transmission elements and the structural parts can be selected by a person skilled in the art according to actual needs.

Since the double-sided circular arc gear 20 in the embodiment of the present disclosure may be machined by milling, transmission elements and/or structural members such as the gear driving shaft 30 may be integrally formed with the double-sided circular arc gear 20. Certainly, when other parts are required to be matched with the double-faced circular arc gear, the parts and the double-faced circular arc gear can be made into an integral part, the number of assembling stages is reduced, the number of parts is greatly reduced, the number of assembling stages is greatly reduced, multi-stage assembling precision errors are greatly reduced, various comprehensive instability is greatly reduced, the number of fasteners or positioning pieces can be greatly reduced, and the integral part has stronger rigidity, integral structure precision and retentivity.

The old gear in the prior art is limited by a plurality of conventional processing modes, for example, other parts on the gear need to be made into split parts and then are independently assembled. Precision errors (concentricity, cylindricity, position degree, verticality, levelness, parallelism and the like) exist during each level of assembly, the errors are accumulated along with the increase of the matching of parts, the single parts are qualified probably, and the integral multi-layer multi-level assembly is unqualified to cause the precision to exceed the tolerance and generate various comprehensive instability; multistage assembly will use fastener or setting element, or along with the time, operating time's increase, multistage assembly overall structure precision maintenance can reduce, and the rigidity can reduce.

Optionally, the double-sided circular arc gear 20 in the embodiment of the present disclosure includes at least two gear teeth 21, for example, 2, 3, 4, 5, 8, 10, 15, 20, and the like, and the selectable range of the number of the gear teeth 21 is wider. Gears in the prior art are in involute meshing, and if the number of gear teeth is small, the problem of undercut can occur, while the meshing line of the double-face circular arc gear 20 in the embodiment of the disclosure is a circular arc line, and the problem of undercut cannot occur no matter a plurality of gear teeth 21 are arranged.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode 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 and features of the various embodiments/modes or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

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

It will be understood by those skilled in the art that the foregoing 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 may be made to those skilled in the art, based on the above disclosure, and still be within the scope of the present disclosure.

Claims (14)

1. A synchronous belt transmission structure based on double-sided circular arc gears is characterized by comprising a synchronous belt and two double-sided circular 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 a first meshing line which protrudes outwards on the cross section of the double-sided arc gear, the first meshing line is an arc line, the gear tooth grooves are provided with a second meshing line which is recessed inwards, and the second meshing line is an arc line;

the synchronous belt comprises belt teeth and a belt tooth groove which are repeatedly arranged along the circumferential direction, the belt teeth are provided with a third meshing line which protrudes outwards on the cross section of the synchronous belt, the third meshing line is an arc line, the belt tooth groove is provided with a fourth meshing line which is recessed 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 synchronous belt transmission structure as claimed in claim 1, wherein at a complete engagement start position where the double-sided circular arc gear is engaged with the synchronous belt, a gear tooth of one of the double-sided circular arc gear is engaged with a belt tooth groove of the synchronous belt, and a gear tooth groove of the other of the double-sided circular arc gear is engaged with a belt tooth of the synchronous belt.

3. The synchronous belt drive structure of claim 1, wherein at a complete meshing start position of the double-sided circular arc gear and the synchronous belt, two gear teeth of the double-sided circular arc gear are meshed with a toothed groove of the synchronous belt, or, two gear teeth of the double-sided circular arc gear are meshed with the toothed groove of the synchronous belt.

4. The synchronous belt drive structure of any one of claims 1 to 3, wherein a radius of the fourth meshing line is slightly larger than a radius of the first meshing line, and/or a radius of the second meshing line is slightly larger than a radius of the third meshing line.

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

6. The synchronous belt drive structure of any one of claims 1 to 3, wherein the double-sided circular arc 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 circular arc gear, the distance between the arc center of the first meshing line and the arc center of the second meshing line and the center of the double-sided circular arc gear is the same; 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 synchronous belt drive structure of any one of claims 1 to 3, wherein the double-sided circular arc gear further comprises a gear tooth connecting portion between the gear tooth and the gear tooth groove, and the synchronous belt further comprises a toothed connecting portion between the belt tooth and the belt tooth groove; on the cross section of the double-sided circular arc gear, a first distance is reserved between the arc center of the first meshing line and the center of the double-sided circular arc gear, a second distance is reserved between the arc center of the second meshing line and the center of the double-sided circular 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, the arc center of the fourth meshing line has a second height, and the second height is smaller than the first height.

8. The synchronous belt drive structure of claim 7, wherein the gear tooth connecting portion includes, in a cross section of the double-sided circular arc gear, an outwardly convex first connecting line and an inwardly concave second connecting line connected end to end, the first connecting line being connected with the gear tooth, and the second connecting line being connected with the gear tooth groove; on the cross section of the synchronous belt, the toothed connecting part comprises a third connecting line which is convex outwards and a fourth connecting line which is concave inwards, the third connecting line is connected with the toothed belt, and the fourth connecting line 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 arcs.

9. The synchronous belt drive structure of claim 8, wherein the first connecting line is a circular arc that is concentric with the first meshing line, the second connecting line is a circular arc that is concentric with the second meshing line, the third connecting line is a circular arc that is concentric with the third meshing line, and the fourth connecting line is a circular arc that is concentric with the fourth meshing line.

10. The synchronous belt drive structure of any one of claims 1 to 3, wherein the first meshing line, the second meshing line, the third meshing line, and the fourth meshing line are all circular arc lines with a radian of pi.

11. The synchronous belt drive structure of 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 gear teeth is parallel to a normal of a cross section of the synchronous belt; or, the extending direction of at least part of the teeth of a cogwheel with first contained angle has between the axis of double-sided circular arc gear, the extending direction of at least part of the tooth with the second contained angle has between the normal of the cross section of hold-in range, first contained angle with the second contained angle all is greater than 0 and is less than 90.

12. The synchronous belt drive of claim 11, wherein the teeth extend in a curved, broken or straight path; the extension path of the belt teeth is a curve, a broken line or a straight line.

13. A synchronous belt drive as in any of claims 1-3, further comprising at least one drive element and/or structure integrally formed with the double-sided circular arc gear.

14. The synchronous belt drive of any one of claims 1-3, wherein the double-sided circular arc gear comprises at least two gear teeth.

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