CN219827633U

CN219827633U - Gear structure and transmission element

Info

Publication number: CN219827633U
Application number: CN202222186162.1U
Authority: CN
Inventors: 孟庆周; 何欣; 孟繁星; 周子钰
Original assignee: Shenzhen Tales Technology Co ltd
Current assignee: Shenzhen Tales Technology Co ltd
Priority date: 2022-07-20
Filing date: 2022-08-18
Publication date: 2023-10-13
Anticipated expiration: 2032-08-18
Also published as: CN117432772A; CN117432760A; CN117432774A; CN219809369U; CN117469361A; CN117469354A

Abstract

The embodiment of the disclosure discloses a gear structure and a transmission element. The gear structure comprises gear teeth and tooth grooves which are repeatedly distributed along the circumferential direction; the gear teeth have first engaging portions protruding outwardly, and the tooth slots have second engaging portions recessed inwardly; on the cross section of the gear structure, the edge of the first meshing part and the edge of the second meshing part are arc-shaped; the first engagement portion and/or the second engagement portion includes a plurality of rolling members arranged on a side thereof remote from a center of the gear structure, the rolling members being rollable in an engagement direction of the gear structure, the plurality of rolling members constituting engagement positions of the first engagement portion and/or the second engagement portion.

Description

Gear structure and transmission element

Technical Field

The disclosure relates to the technical field of mechanical structures, and in particular relates to a gear structure and a transmission element.

Background

With the increasing demands of industry for high precision, small size, there is also an increasing demand for performance of the mechanical element, the gear, which is capable of transmitting motion and power through continuous meshing.

The inventor finds that the gear in the prior art has larger transmission resistance due to sliding friction in the meshing process, the mechanical efficiency is required to be improved, involute meshing is always in linear abrasion, the wear is not resistant, and the service life is required to be improved.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide a gear structure and a transmission element, which at least partially improve the mechanical efficiency of gear transmission and improve the service life of the gear.

In a first aspect, an embodiment of the present disclosure provides a gear structure, which adopts the following technical scheme:

the gear structure comprises gear teeth and tooth grooves which are repeatedly distributed along the circumferential direction;

the gear teeth have first engaging portions protruding outwardly, and the tooth slots have second engaging portions recessed inwardly; on the cross section of the gear structure, the edge of the first meshing part and the edge of the second meshing part are arc-shaped;

the first engagement portion and/or the second engagement portion includes a plurality of rolling members arranged on a side thereof remote from a center of the gear structure, the rolling members being rollable in an engagement direction of the gear structure, the plurality of rolling members constituting engagement positions of the first engagement portion and/or the second engagement portion.

Optionally, the first engagement portion and the second engagement portion each include a plurality of rolling members arranged on a side thereof remote from a center of the gear structure.

Optionally, a first guide member is provided outside the first engagement portion and the second engagement portion, the first guide member having a first rolling space in which the rolling members roll in the engagement direction of the gear structure, and the plurality of rolling members being placed in the first rolling space.

Optionally, the size of the first rolling space is slightly larger than the size of the rolling member in the axial direction of the gear structure, and the first guide limits the movement of the rolling member in the axial direction of the gear structure.

Alternatively, only the first engagement portion includes a plurality of rolling members arranged on a side thereof remote from a center of the gear structure.

Optionally, the first engagement portion includes a centrally located fixed shaft, an axial direction of which is parallel to an axial direction of the gear structure; the fixed shaft is circumferentially provided with a second guide member having a second rolling space in which the rolling members roll in the meshing direction of the gear structure, and the plurality of rolling members are placed in the second rolling space.

Optionally, the size of the second rolling space is slightly larger than the size of the rolling member in the axial direction of the fixed shaft, and the second guide limits the movement of the rolling member in the axial direction of the fixed shaft.

Optionally, a third guide member is provided outside the first engagement portion, the third guide member having a third rolling space in which the rolling members roll in the engagement direction of the gear structure, the plurality of rolling members being placed in the third rolling space.

Optionally, the size of the third rolling space is slightly larger than the size of the rolling member in the axial direction of the gear structure, and the third guide restricts the movement of the rolling member in the axial direction of the gear structure.

Optionally, the rolling element is a ball or a needle roller.

Optionally, the radius of the edge of the second engagement portion is slightly greater than or equal to the radius of the edge of the first engagement portion.

Optionally, the gear structure includes only the teeth and the tooth grooves, and in a cross section of the gear structure, a center of arc of an edge of the first engagement portion and a center of arc of an edge of the second engagement portion are the same as a distance between centers of the gear structure.

Optionally, the gear structure further includes a gear tooth connection portion between the gear tooth and the gear tooth slot, and in a cross section of the gear structure, a first distance is provided between an arc center of an edge of the first engagement portion and a center of the gear structure, and a second distance is provided between an arc center of an edge of the second engagement portion and the center of the gear structure, and the second distance is smaller than the first distance.

Optionally, on the cross section of the gear structure, the gear tooth connecting portion includes a first connecting line protruding outwards and a second connecting line recessed inwards, the first connecting line is connected with the gear teeth, the second connecting line is connected with the tooth grooves, and the first connecting line and the second connecting line are arc lines.

Optionally, the first connecting line is an arc line co-rounded with the edge of the first engaging portion, and the second connecting line is an arc line co-rounded with the edge of the second engaging portion.

Optionally, the edge of the first engagement portion and the edge of the second engagement portion are arc lines with an arc degree pi.

Optionally, the extending direction of the gear teeth is parallel to the axis of the gear structure; 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 gear structure, and the first included angle is larger than 0 degrees and smaller than 90 degrees.

Optionally, the extending path of the gear teeth is a curve, a broken line or a straight line.

Optionally, the gear structure comprises at least two gear teeth.

In a second aspect, embodiments of the present disclosure provide a transmission element comprising a protrusion that mates with a tooth slot of a gear structure as described in any one of the above, and a recess that mates with a tooth of a gear structure as described in any one of the above.

The embodiment of the disclosure provides a gear structure and a transmission element, on one hand, gear teeth are provided with first meshing parts protruding outwards, tooth grooves are provided with second meshing parts recessed inwards, on the cross section of the gear structure, the edges of the first meshing parts and the edges of the second meshing parts are arc-shaped, on the extending direction of the gear structure, the edges of the first meshing parts form first meshing surfaces, the edges of the second meshing parts form second meshing surfaces, in the using process of the gear structure, the first meshing surfaces or the second meshing surfaces are meshed with other transmission elements, and the first meshing surfaces or the second meshing surfaces are meshed with the other transmission elements, but not involute meshing in the prior art, are worn in the transmission process, so that the contact area is increased, the contact area is more wear-resistant, the service life is effectively prolonged, the tooth shape of the gear teeth is firmer, the gear teeth can be made larger and firmer under the same modulus, and the strength and the wear resistance are improved; on the other hand, because the first meshing part and/or the second meshing part comprises a plurality of rolling elements which are arranged on one side of the first meshing part and/or the second meshing part far away from the center of the gear structure, the rolling elements can roll along the meshing direction of the gear structure, the plurality of rolling elements form the meshing positions of the first meshing part and/or the second meshing part, and in the use process of the gear structure, the rolling elements roll along the meshing direction of the gear structure, so that rolling friction is formed between the gear structure and a matched transmission element, the transmission resistance is small, and the mechanical efficiency can be greatly improved.

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 gear structure provided by an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of a second gear structure provided by an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view of a third gear structure provided by an embodiment of the present disclosure;

FIG. 4 is a cross-sectional view of a fourth gear structure provided by an embodiment of the present disclosure;

FIG. 5 is a first block diagram of an edge of a first engagement portion of a first gear structure provided in an embodiment of the present disclosure;

FIG. 6 is a cross-sectional view along FF' of FIG. 5 provided by an embodiment of the present disclosure;

FIG. 7 is a second block diagram of an edge of a first engagement portion of a first gear structure provided in an embodiment of the present disclosure;

FIG. 8 is a cross-sectional view along FF' of FIG. 7 provided by an embodiment of the present disclosure;

FIG. 9 is a schematic diagram I of a cross-section of a gear structure provided by an embodiment of the present disclosure;

fig. 10 is a schematic diagram ii of a cross section of a gear structure provided in an embodiment of the 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 disclosed embodiments provide a gear structure, specifically, as shown in fig. 1, 2, 3 and 4, fig. 1 is a cross-sectional view of a first gear structure provided by the disclosed embodiments, fig. 2 is a cross-sectional view of a second gear structure provided by the disclosed embodiments, fig. 3 is a cross-sectional view of a third gear structure provided by the disclosed embodiments, and fig. 4 is a cross-sectional view of a fourth gear structure provided by the disclosed embodiments, the gear structure including gear teeth 10 and gear grooves 20 repeatedly arranged along a circumferential direction, specifically, the gear teeth 10 and the gear grooves 20 have the following structures:

the gear teeth 10 have first engaging portions 11 protruding outward, and the tooth slots 20 have second engaging portions 21 recessed inward; the edges of the first engagement portion 11 and the edges of the second engagement portion are arc-shaped in cross section of the gear structure.

The first engaging portion 11 and/or the second engaging portion 21 includes a plurality of rolling members 30 arranged on a side thereof away from a center (indicated by a center black point in the drawing) of the gear structure, the rolling members 30 being rollable in an engaging direction (indicated by an arrow in the drawing) of the gear structure, the plurality of rolling members 30 constituting an engaging position of the first engaging portion 11 and/or the second engaging portion 21.

The above "first engaging portion 11 and/or second engaging portion 21" includes three cases: first, the first engagement portion 11 and the second engagement portion 21; second, only the first engaging portion 11; third, only the second engagement portion 21. The rolling element 30 may be arranged on the side of the entire first engagement portion 11 and/or second engagement portion 21 away from the center of the gear structure, i.e. all engagement positions of the first engagement portion 11 and/or second engagement portion 21 are rolling elements 30; alternatively, the rolling elements 30 are distributed at a partial position of the first engaging portion 11 and/or the second engaging portion 21 on a side away from the center of the gear structure, that is, a partial engaging position of the first engaging portion 11 and/or the second engaging portion 21 is the rolling element 30.

The gear structure with the structure has at least the following technical effects:

on the one hand, the gear teeth 10 are provided with first meshing parts 11 protruding outwards, the tooth grooves 20 are provided with second meshing parts 21 recessed inwards, on the cross section of the gear structure, the edges of the first meshing parts 11 and the edges of the second meshing parts 21 are arc-shaped, on the extending direction of the gear structure, the edges of the first meshing parts 11 form first meshing surfaces, the edges of the second meshing parts 21 form second meshing surfaces, during the use process of the gear structure, the first meshing surfaces or the second meshing surfaces are meshed with other transmission elements, and the first meshing surfaces or the second meshing surfaces are meshed with the other transmission elements, but are not involute meshing in the prior art, and are worn in the transmission process, so that the contact area is increased, the contact area is more wear-resistant, the service life is effectively prolonged, the tooth shape of the gear teeth 10 is firmer, the gear teeth can be made larger and firmer under the same modulus, and the strength and the wear resistance are improved;

on the other hand, since the first engaging portion 11 and/or the second engaging portion 21 includes the plurality of rolling members 30 arranged on one side thereof away from the center of the gear structure, the rolling members 30 can roll in the engaging direction of the gear structure, the plurality of rolling members 30 constitute the engaging position of the first engaging portion 11 and/or the second engaging portion 21, and during use of the gear structure, the rolling members 30 roll in the engaging direction of the gear structure, thereby rolling friction is caused between the gear structure and the matched transmission element, transmission resistance is small, and mechanical efficiency can be greatly improved.

In addition, it should be added that the gear structure applied in the embodiments of the present disclosure has the following technical advantages: 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.

The following embodiments of the present disclosure exemplify specific configurations of gear structures.

Alternatively, as shown in fig. 1, the first engaging portion 11 and the second engaging portion 21 each include a plurality of rolling members 30 arranged on a side thereof away from the center of the gear structure. In this case, during use of the gear structure, rolling friction is provided between the first and second engagement portions 11 and 21 and the other transmission elements.

Further, as shown in fig. 5, 6, 7 and 8, fig. 5 is a first structural view of an edge of a first engagement portion of a first gear structure provided in an embodiment of the present disclosure, fig. 6 is a cross-sectional view of fig. 5 along FF 'provided in an embodiment of the present disclosure, fig. 7 is a second structural view of an edge of a first engagement portion of a first gear structure provided in an embodiment of the present disclosure, fig. 8 is a cross-sectional view of fig. 7 along FF' provided in an embodiment of the present disclosure, in which first guide members 40 are provided outside of each of the first engagement portion 11 and the second engagement portion 21, the first guide members 40 have a first rolling space in which rolling members 30 roll along an engagement direction of the gear structure (directions indicated by arrows in fig. 5 and 7), and a plurality of rolling members 30 are placed in the first rolling space. In the example shown in fig. 5 and 6, the rolling elements 30 are balls, and in the example shown in fig. 7 and 8, the rolling elements 30 are needle rollers.

For example, the first engaging portion 11 is provided on the outer side with a first guide 40, and one, two or more rows of rolling elements 30 may be placed in the first guide 40 in the axial direction of the gear structure; alternatively, two or more first guides 40 are provided on the outer side of the first engagement portion 11, and a row of rolling elements 30 is placed in each of the first guides 40 in the axial direction of the gear structure. Of course, the outer first guide 40 of the second engaging portion 21 may be similarly disposed, and will not be described herein.

Further, in the embodiment of the present disclosure, as shown in fig. 6 and 8, the size of the first rolling space is slightly larger than the size of the rolling elements 30 in the axial direction of the gear structure (the direction indicated by the arrow in fig. 6 and 8), that is, each first guiding element 40 only places one row of rolling elements 30, and the first guiding element 40 limits the movement of the rolling elements 30 in the axial direction of the gear structure, so as to further reduce the transmission resistance and improve the mechanical efficiency.

The above-described structure of the first guide 40 is only an example, and one skilled in the art may set it according to actual needs.

Alternatively, as shown in fig. 2 and 3, in the embodiment of the present disclosure, only the first engagement portion 11 includes the plurality of rolling members 30 arranged on the side thereof away from the center of the gear structure.

Alternatively, as shown in fig. 2, in the embodiment of the present disclosure, the first engaging portion 11 includes a fixed shaft 50 located at the center, and an axial direction of the fixed shaft 50 is parallel to an axial direction of the gear structure; the fixed shaft 50 is provided with a second guide 60 in the circumferential direction, the second guide 60 having a second rolling space in which the rolling members 30 roll in the meshing direction of the gear structure, and the plurality of rolling members 30 are placed. In fig. 2, in order to clearly show the positional relationship between the fixed shaft 50 and the rolling member 30, the structure of the second guide 60 is simplified or partially hidden, and those skilled in the art may refer to the specific structure, number, placement manner of the rolling member 30, etc. of the first guide 40, and the specific structure, number, placement manner of the rolling member 30, etc. of the second guide 60 are set, which will not be described herein.

Similarly, a second guide 60 is provided outside the fixed shaft 50, and one, two or more rows of rolling members 30 may be placed in the second guide 60 in the axial direction of the fixed shaft 50; alternatively, two or more second guides 60 are provided outside the fixed shaft 50, and a row of rolling members 30 is placed in each second guide 60 in the axial direction of the fixed shaft 50.

Further, in the embodiment of the present disclosure, the size of the second rolling space is slightly larger than the size of the rolling elements 30 in the axial direction of the fixed shaft 50, that is, each second guiding element 60 only places one row of rolling elements 30, and the second guiding elements 60 limit the movement of the rolling elements 30 in the axial direction of the fixed shaft 50, so as to further reduce the transmission resistance and improve the mechanical efficiency.

Alternatively, in the embodiment of the present disclosure, the outside of the first meshing portion 11 is provided with a third guide having a third rolling space in which the rolling members 30 roll in the meshing direction of the gear structure, and the plurality of rolling members 30 are placed in the third rolling space. The specific structure, number, placement of the rolling members 30, etc. of the third guide member can be set by those skilled in the art with reference to the specific structure, number, placement of the rolling members 30, etc. of the first guide member 40, and will not be described herein.

Further, in the embodiment of the present disclosure, the size of the third rolling space is slightly larger than the size of the rolling elements 30 in the axial direction of the gear structure, that is, each third guiding element only places one row of rolling elements 30, and the third guiding elements limit the movement of the rolling elements 30 in the axial direction of the gear structure, so as to further reduce the transmission resistance and improve the mechanical efficiency.

Of course, it is also possible for a person skilled in the art, as shown in fig. 4, that only the second engagement portion 21 comprises a plurality of rolling elements 30 arranged on its side remote from the centre of the gear structure.

Alternatively, the rolling elements 30 in the embodiments of the present disclosure may be balls or needles, and those skilled in the art may select other rolling elements according to actual needs.

Alternatively, in the embodiment of the present disclosure, the radius of the edge of the second engagement portion 21 may be greater than, less than, or equal to the radius of the edge of the first engagement portion 11. Further, in the embodiment of the present disclosure, the radius of the edge of the second engagement portion 21 is selected to be slightly larger than or equal to the radius of the edge of the first engagement portion 11. The effect of the above "slightly larger" is that: when the two gear structures are matched, the first meshing part 11 of one gear structure can smoothly realize meshing and separating with the second meshing part of the other gear structure, so that the locking is avoided. The dimension range of "slightly greater" can be selected by those skilled in the art according to actual needs, on the principle that engagement of the engagement portions can be achieved and jamming can be avoided at the same time. For example, the radius of the edge of the second engagement portion is 0.05 μm, 0.1 μm, 0.2 μm, 0.5 μm, etc. larger than the radius of the edge of the first engagement portion.

Alternatively, as shown in fig. 9, fig. 9 is a schematic diagram of a cross section of a gear structure provided in an embodiment of the present disclosure, in fig. 9, only the edges of the engagement portions are shown by simple lines, the structures such as rolling elements are not shown, the gear structure only includes the gear teeth 10 and the tooth grooves 20, and in the cross section of the gear structure, the distance between the arc center of the edge a of the first engagement portion 11 (shown by the upper right black point in fig. 9) and the arc center of the edge B of the second engagement portion 21 (shown by the lower right black point in fig. 9) is d, that is, in the orientation shown in fig. 9, the arc center of the edge a of the first engagement portion 11 and the arc center of the edge B of the second engagement portion 21 are on the same circumference centered on the center of the gear structure. In this case, during the transmission of the transmission structure including the gear structure, the operation is smooth and the vibration is small.

Alternatively, as shown in fig. 10, fig. 10 is a schematic diagram two of a cross section of a gear structure provided in the embodiment of the present disclosure, in fig. 10, only the edge of the engagement portion is shown by a simple line, the structure such as a rolling member is not shown, the gear structure further includes a gear tooth connection portion 70 located between the gear tooth 10 and the gear tooth groove 20, in the cross section of the gear structure, a first distance is provided between the arc center (shown by a black dot on the left side in fig. 10) of the edge a of the first engagement portion 11 and the center of the gear structure, and a second distance is provided between the arc center (shown by a black dot on the right side in fig. 10) of the edge B of the second engagement portion 21 and the center (not shown in fig. 10) of the gear structure, the second distance is smaller than the first distance. That is, in the orientation of the cross section of the gear structure (refer to the orientation shown in fig. 10), the arc center of the edge a of the first engagement portion 11 and the arc center of the edge B of the second engagement portion 21 are on different circumferences centered on the center of the gear structure. In this case, there is a speed change and vibration effect during the transmission of the transmission structure including the gear structure.

Further, as shown in fig. 10, in the cross section of the gear structure, the tooth connecting portion 70 includes a first connecting line 71 protruding outward and a second connecting line 72 recessed inward, which are connected end to end, the first connecting line 71 being connected to the tooth 10, the second connecting line 72 being connected to the tooth slot 20, the first connecting line 71 and the second connecting line 72 being arc lines. With the above structure of the cogged-wheel coupling 70, the area of engagement between the gear structure and other transmission elements can be further increased.

Further, in the embodiment of the present disclosure, as shown in fig. 10, the first connection line 71 is an arc line co-rounded with the edge of the first engagement portion 11, and the second connection line 72 is an arc line co-rounded with the edge of the second engagement portion 21. In this case, during the transmission of the transmission structure including the gear structure, the first connection line 71 or the second connection line 72 is also engaged with other transmission elements, thereby further increasing the engagement area between the gear structure and the other transmission elements.

Alternatively, in the embodiment of the present disclosure, as shown in fig. 9, the edges of the first engagement portion 11 and the edges of the second engagement portion 21 are each circular arcs having a radian pi, that is, half of the entire circumference, so that the engagement area between the gear structure and the other transmission element is further increased.

Alternatively, the gear structure in the embodiments of the present disclosure may be a spur gear or a helical gear. When the gear structure is a spur gear, the extending direction of the gear teeth 10 is parallel to the axis of the gear structure; when the gear structure is a helical gear, a first included angle is formed between the extending direction of at least a part of the gear teeth 10 and the axis of the gear structure, and the first included angle is 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 10 in the embodiment of the present disclosure is a curve (e.g., an arc), a broken line (e.g., a herringbone), or a straight line.

Optionally, the gear structure in embodiments of the present disclosure includes at least two gear teeth 10, e.g., 2, 3, 4, 5, 8, 10, 15, 20, etc., with a wider range of selectable numbers of gear teeth 10. Gears in the prior art are involute gears, if the number of gear teeth is small, the undercut problem can occur, but the gear structure in the embodiment of the disclosure is engaged with the engagement surface, and no undercut problem can occur no matter a plurality of gear teeth 10 are arranged.

Optionally, the gear structure of the embodiments of the present disclosure may further include a driving member (a component that drives rotation of the gear structure) and/or a structural member, which are integrally formed with the main structural portion of the gear structure. The above main body structure portion may include a structure located inside the gear teeth and the tooth grooves, a portion of the gear teeth or the tooth grooves other than the rolling members (or the rolling members and the guide members, or the rolling members, the fixed shaft, the guide members, etc.).

The driving members may be any structures such as gears, gear rings, racks, driving shafts, etc., the shapes of the driving members may be regular or irregular, the structural members may be any structural members, and the positional relationship (up-down, left-right, inside-outside, coaxial or not, etc.), the size relationship (equal or unequal) and the like between each driving member and each structural member and the gear structure may be various, which are not limited herein, and may be selected by those skilled in the art according to actual needs.

The main body structure of the gear structure in the embodiments of the present disclosure may be machined by milling, and thus, the driving member and/or the structural member may be integrally formed with the main body structure. Of course, when other parts are needed to be matched with the gear structure, the parts and the gear structure 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, and has 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.

In addition, the embodiment of the disclosure also provides a transmission element, which includes a protruding portion and a recessed portion, wherein the protruding portion is matched with the tooth slot of the gear structure of any one of the above, and the recessed portion is matched with the tooth slot of the gear structure of any one of the above. The above "matching" means that the shape and size of the above transmission element are matched with those of the gear structure, so that the engagement of the two can be ensured. The projections and/or recesses of the transmission element may or may not be provided with corresponding rolling structures, which are not limited herein.

Alternatively, the transmission element is a rack, a gear ring, a screw rod, a worm or a synchronous belt, etc., and the person skilled in the art can select according to actual needs.

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 utility model. 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 utility model, 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

1. The gear structure is characterized by comprising gear teeth and tooth grooves which are repeatedly distributed along the circumferential direction;

the gear teeth have first engaging portions protruding outwardly, and the tooth slots have second engaging portions recessed inwardly; the edges of the first meshing part and the second meshing part are arc-shaped;

2. The gear structure according to claim 1, wherein the first engagement portion and the second engagement portion each include a plurality of rolling members arranged on a side thereof remote from a center of the gear structure.

3. The gear structure according to claim 2, wherein the first engaging portion and the second engaging portion are each provided with a first guide member on an outer side thereof, the first guide member having a first rolling space in which the rolling members roll in an engaging direction of the gear structure, the plurality of rolling members being placed in the first rolling space.

4. A gear structure according to claim 1, wherein only the first engagement portion includes a plurality of rolling members arranged on a side thereof remote from a center of the gear structure.

5. The gear structure according to claim 4, wherein the first meshing portion includes a centrally located fixed shaft, an axial direction of which is parallel to an axial direction of the gear structure; the fixed shaft is circumferentially provided with a second guide member having a second rolling space in which the rolling members roll in the meshing direction of the gear structure, and the plurality of rolling members are placed in the second rolling space.

6. The gear structure according to claim 4, wherein a third guide member having a third rolling space in which the rolling members roll in the meshing direction of the gear structure is provided outside the first meshing portion, the plurality of rolling members being placed in the third rolling space.

7. A gear arrangement according to any one of claims 1 to 6, wherein the rolling elements are balls or needles.

8. The gear structure according to any one of claims 1 to 6, wherein the gear structure includes only the teeth and the tooth grooves, and in a cross section of the gear structure, a center of arc of an edge of the first engagement portion and a center of arc of an edge of the second engagement portion are the same as a distance between centers of the gear structure.

9. The gear structure according to any one of claims 1 to 6, further comprising a tooth connection between the tooth and the tooth socket, wherein in a cross section of the gear structure, a first distance is provided between an arc center of an edge of the first engagement portion and a center of the gear structure, and a second distance is provided between an arc center of an edge of the second engagement portion and a center of the gear structure, the second distance being smaller than the first distance.

10. The gear structure according to claim 9, wherein in a cross section of the gear structure, the tooth connecting portion includes a first connecting line protruding outward and a second connecting line recessed inward, which are connected end to end, the first connecting line being connected to the tooth, the second connecting line being connected to the tooth slot, the first connecting line and the second connecting line each being an arc.

11. The gear structure of claim 10, wherein the first connection line is an arc line co-rounded with an edge of the first engagement portion and the second connection line is an arc line co-rounded with an edge of the second engagement portion.

12. The gear structure according to any one of claims 1 to 6, wherein the edges of the first engagement portion and the edges of the second engagement portion are each arc lines of a circle having an arc degree of pi.

13. The gear structure according to any one of claims 1 to 6, wherein the extending direction of the gear teeth is parallel to the axis of the gear structure; 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 gear structure, and the first included angle is larger than 0 degrees and smaller than 90 degrees.

14. The gear structure of claim 13, wherein the path of extension of the gear teeth is a curve, a broken line, or a straight line.

15. The gear structure of any of claims 1 to 6, wherein the gear structure comprises at least two gear teeth.

16. A transmission element comprising a protrusion matching a tooth socket of a gear arrangement according to any one of claims 1 to 15 and a recess matching a tooth of a gear arrangement according to any one of claims 1 to 15.