CN117432772A

CN117432772A - Bevel gear and transmission structure

Info

Publication number: CN117432772A
Application number: CN202310889889.2A
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: 2023-07-19
Publication date: 2024-01-23
Also published as: CN117432774A; CN219827633U; CN117432760A; CN117469361A; CN117469354A; CN219809369U

Abstract

The embodiment of the disclosure discloses a bevel gear and a transmission structure. Wherein, the bevel gear comprises gear teeth and tooth sockets; an extension line of the extending direction of the gear teeth is intersected with the axis of the bevel gear, a first included angle is formed between the extension line and the axis, and the first included angle is larger than 0 degrees and smaller than 90 degrees; the gear teeth are provided with first meshing parts protruding outwards, and the tooth grooves are provided with second meshing parts recessed inwards; on the cross section of the bevel gear, the edges of the first meshing part and the second meshing part are arc-shaped; the shape of each cross section of the bevel gear is consistent along the axis direction of the bevel gear, and the radius of the edge of the first meshing part and the radius of the edge of the second meshing part are gradually increased; at least one of the first engagement portion and the second engagement portion serves as a rolling engagement portion including a plurality of rolling members arranged on a side away from an edge thereof, the rolling members being rollable in an engagement direction, the plurality of rolling members constituting engagement positions of the rolling engagement portion.

Description

Bevel gear and transmission structure

Technical Field

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

Background

As industry demands for high precision, small size have increased, so has the performance requirements for the mechanical element of the bevel gear.

The inventor finds that sliding friction is adopted in the meshing process of the bevel gears in the prior art, the transmission resistance is large, the mechanical efficiency is required to be improved, involute meshing is adopted, the bevel gears are always worn, the bevel gears are not wear-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 bevel gear and a transmission structure, which at least partially improves the mechanical efficiency of the bevel gear transmission and improves the service life of the bevel gear.

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

the bevel gear includes: gear teeth and tooth sockets repeatedly distributed along the circumferential direction;

an extension line of the extending direction of the gear teeth is intersected with the axis of the bevel gear, a first included angle is formed between the extension line and the axis, and the first included angle is larger than 0 degrees and smaller than 90 degrees;

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 bevel gear, the edges of the first meshing part and the second meshing part are arc-shaped; the shape of each cross section of the bevel gear is consistent along the axis direction of the bevel gear, and the radius of the edge of the first meshing part and the radius of the edge of the second meshing part are gradually increased;

at least one of the first engaging portion and the second engaging portion serves as a rolling engaging portion including a plurality of rolling members arranged on a side away from an edge thereof, the rolling members being rollable in an engaging direction, the plurality of rolling members constituting an engaging position of the rolling engaging portion.

Optionally, the first engagement portion and the second engagement portion each function as a rolling engagement portion.

Optionally, a first guide member is provided on an outer side of the rolling engagement portion, the first guide member having a first rolling space in which the rolling members roll in the engagement direction, and the plurality of rolling members are placed in the first rolling space.

Optionally, in the extending direction of the rolling engagement portion, a size of the first rolling space is slightly larger than a size of the rolling member, and the first guide restricts movement of the rolling member in an axial direction of the bevel gear.

Alternatively, only the first engagement portion serves as a rolling engagement portion.

Optionally, the rolling engagement part includes a fixed shaft located at the center, and an axial direction of the fixed shaft is parallel to an extending direction of the rolling engagement part; the fixed shaft is provided with a second guide in the circumferential direction, the second guide has a second rolling space in which the rolling members roll in the meshing direction, and the plurality of rolling members are placed in the second rolling space.

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

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 bevel gear includes only the gear teeth and the gear slots, and in a cross section of the gear ring, 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 bevel gear.

Optionally, the bevel gear further comprises a gear tooth connection between the gear tooth and the gear tooth socket; a first distance is arranged between the arc center of the edge of the first meshing part and the center of the bevel gear on the cross section of the bevel gear, and a second distance is arranged between the arc center of the edge of the second meshing part and the center of the bevel gear; the bevel gear is an outer gear ring, the second distance is smaller than the first distance, or the bevel gear is an inner gear ring, and the second distance is larger than the first distance.

Optionally, on the cross section of the bevel gear, the gear tooth connection part comprises a first connection line which is connected end to end and protrudes outwards and a second connection line which is recessed inwards, the first connection line is connected with the gear tooth, and the second connection line is connected with the gear tooth socket; 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, on a circular surface perpendicular to the axis of the bevel gear and centered on the axis, the projected extension direction of the gear teeth is a radial direction of the circular surface passing through one end of the gear teeth.

Optionally, on a circular surface perpendicular to the axis of the bevel gear and centered on the axis, at least a portion of the projected extension direction of the gear teeth and a radial direction of the circular surface passing through one end of the gear teeth have a second included angle, and the second included angle is greater than 0 ° and less than 90 °.

Optionally, on a circular surface perpendicular to the axis of the bevel gear and centered on the axis, the projected extension path of the gear teeth is a curve, a broken line or a straight line.

Optionally, the bevel gear comprises at least two of the gear teeth.

In a second aspect, embodiments of the present disclosure provide a transmission structure comprising two intermeshing bevel gears, at least one of the bevel gears being any one of the bevel gears above.

Alternatively, the engagement angle of the two bevel gears is 30 °, 45 °, 60 °, or 90 °.

The embodiment of the disclosure provides a bevel gear structure and a transmission structure, 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 bevel gear, 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 teeth, the edges of the first meshing parts form a first meshing surface, the edges of the second meshing parts form a second meshing surface, in the using process of the bevel gear, the first meshing surface or the second meshing surface is meshed with other bevel gears, and the first meshing surface or the second meshing surface is meshed with the other bevel gears, but not involute meshing in the prior art, and is worn in the transmission process, so that the contact area is increased, the wear resistance is improved, 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 at least one of the first meshing part and the second meshing part is used as a rolling meshing part, the rolling meshing part comprises a plurality of rolling elements which are arranged on the outer side of the edge of the rolling meshing part, the rolling elements can roll along the meshing direction, the plurality of rolling elements form the meshing position of the rolling meshing part, and in the using process of the bevel gear, the rolling elements roll along the meshing direction, so that rolling friction is formed between the bevel gear and the matched bevel gear, 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 schematic view of a bevel gear according to an embodiment of the present disclosure;

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

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

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

FIG. 5 is a cross-sectional view of a fourth bevel gear provided by an embodiment of the present disclosure;

FIG. 6 is a first block diagram of an edge of a first engagement portion of a first bevel gear provided in an embodiment of the present disclosure;

FIG. 7 is a cross-sectional view along FF' of FIG. 6 provided by an embodiment of the present disclosure;

FIG. 8 is a second block diagram of the edge of the first engagement portion of the first bevel gear provided in accordance with embodiments of the present disclosure;

FIG. 9 is a cross-sectional view along FF' of FIG. 8 provided by an embodiment of the present disclosure;

FIG. 10 is a schematic diagram I of a cross section of a bevel gear provided by an embodiment of the present disclosure;

FIG. 11 is a schematic diagram II of a cross section of a bevel gear provided in an embodiment of the present disclosure;

FIG. 12 is a schematic view of projected directions of extension of teeth of a straight bevel gear provided by an embodiment of the present disclosure;

fig. 13 is a schematic view showing an extending direction of projection of gear teeth of a bevel gear according to an embodiment of the present disclosure.

Detailed Description

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

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

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

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

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

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

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

The embodiment of the disclosure provides a bevel gear, specifically, as shown in fig. 1, the shape of gear teeth and tooth grooves is only shown by simple lines in fig. 1, the bevel gear comprises gear teeth 10 and tooth grooves 20 repeatedly arranged along the circumferential direction, an extension line (shown by a dotted line in fig. 1) of the extension direction of the gear teeth 10 intersects with an axis (shown by a direction X in fig. 1) of the bevel gear, and a first included angle is formed between the extension line and the axis, wherein the first included angle is larger than 0 DEG and smaller than 90 DEG;

specifically, as shown in fig. 2 to 5, the gear teeth 10 have first engaging portions 11 protruding outward, and the tooth slots 20 have second engaging portions 21 recessed inward; on the cross section of the bevel gear, the edge of the first meshing part 11 and the edge of the second meshing part are arc-shaped; the shape of each cross section of the bevel gear is uniform along the axis direction of the bevel gear, and the radius of the edge of the first engagement portion 11 and the radius of the edge of the second engagement portion 21 are gradually increased; at least one of the first engaging portion 11 and the second engaging portion 21 serves as a rolling engaging portion including a plurality of rolling members 30 arranged outside an edge thereof, the rolling members 30 being rollably in an engaging direction, the plurality of rolling members 30 constituting an engaging position of the rolling engaging portion.

The above "at least one of the first engaging portion 11 and the 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 bevel gear 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 bevel gear, 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 teeth 10, the edges of the first meshing parts 11 form first meshing surfaces, the edges of the second meshing parts 21 form second meshing surfaces, in the using process of the bevel gear, the first meshing surfaces or the second meshing surfaces are meshed with other bevel gears, and the first meshing surfaces or the second meshing surfaces are meshed with the other bevel gears, 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 further improved;

on the other hand, since at least one of the first engaging portion 11 and the second engaging portion 21 serves as a rolling engaging portion including a plurality of rolling members 30 arranged outside the edges thereof, the rolling members 30 can roll in the engaging direction, the plurality of rolling members 30 constitute the engaging positions of the rolling engaging portion, and during use of the bevel gear, the rolling members 30 roll in the engaging direction, thereby making rolling friction between the bevel gear and the matched bevel gear, reducing transmission resistance, and greatly improving mechanical efficiency.

Additionally, it should be added that the bevel gear in the embodiments of the present disclosure also 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 structures of bevel gears.

Alternatively, as shown in fig. 2, the first engagement portion 11 and the second engagement portion 21 each function as a rolling engagement portion. In this case, during use of the bevel gear, rolling friction is provided between the first and second engagement portions 11 and 21 and the other transmission elements.

Further, as shown in fig. 6 to 9, in the embodiment of the present disclosure, the first guide 40 is provided on the outer side of the rolling engagement portion, the first guide 40 has a first rolling space in which the rolling members 30 roll in the engagement direction (the direction indicated by the arrow in fig. 6 and 8), and the plurality of rolling members 30 are placed in the first rolling space. In the example shown in fig. 6 and 7, the rolling elements 30 are balls, and in the example shown in fig. 8 and 9, the rolling elements 30 are needle rollers. When the rolling member 30 is a ball, the number and/or diameter of the balls may be different at the cross section of the different positions of the first engagement portion 11 or the second engagement portion 12 to realize the shape of the bevel gear; when the rolling member 30 is a needle roller, as shown in fig. 9, the diameter of the needle roller is gradually changed, and the diameter is directly gradually increased or gradually decreased from one end to the other end (specifically, according to the directions of the needle roller and the bevel gear), so as to realize the shape of the bevel gear. In fig. 6 to 9, the first engagement portion 11 is described as an example of a rolling engagement portion, and other engagement portions may be provided as rolling engagement portions according to the above.

For example, a first guide 40 is provided on the outer side of the rolling engagement portion, and one, two or more rows of rolling members 30 may be placed in the first guide 40 in the extending direction of the rolling engagement portion; alternatively, two or more first guides 40 are provided on the outer side of the rolling engagement portion, and one row of rolling members 30 is placed in each of the first guides 40 in the extending direction of the rolling engagement portion.

Further, in the embodiment of the present disclosure, as shown in fig. 7 and 9, in the extending direction of the rolling engagement portion (the direction indicated by the arrow in fig. 7 and 9), the size of the first rolling space is slightly larger than the size of the rolling member 30, and the first guide member 40 restricts the movement of the rolling member 30 in the extending direction of the rolling engagement portion, 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, in the embodiment of the present disclosure, as shown in fig. 3 and 4, only the first engagement portion 11 serves as a rolling engagement portion.

Alternatively, as shown in fig. 3, in the embodiment of the present disclosure, the rolling engagement portion includes a fixed shaft 50 at the center, and an axial direction of the fixed shaft 50 is parallel to an extending direction of the rolling engagement portion; 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 engaging direction, and the plurality of rolling members 30 are placed. In fig. 3, 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 (or the extending direction of the rolling engagement portion); 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 member 30 in the axial direction of the fixed shaft 50, and the second guide 60 limits the movement of the rolling member 30 in the axial direction of the fixed shaft 50 to further reduce the transmission resistance and improve the mechanical efficiency.

Alternatively, in the embodiment of the present disclosure, a third guide (not shown in fig. 3) having a third rolling space in which the rolling members 30 roll in the engagement direction is provided on the outer side of the rolling engagement portion, 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, in the extending direction of the rolling engagement portion, the size of the third rolling space is slightly larger than the size of the rolling member 30, and the third guide member restricts the movement of the rolling member 30 in the extending direction of the rolling engagement portion, so as to further reduce the transmission resistance and improve the mechanical efficiency.

Of course, as shown in fig. 5, only the second engagement portion 21 may be a rolling engagement portion.

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, 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 in the embodiment of the present disclosure. The effect of the above "slightly larger" is that: when the two bevel gears are matched, the first meshing part 11 of one bevel gear can smoothly realize meshing and separating with the second meshing part 21 of the other bevel gear, 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, the bevel gear includes only the gear teeth 10 and the gear grooves 20, as shown in fig. 10, the edges of the engagement portions are indicated by simple lines only in fig. 10, the rolling members and the like are not shown, and the arc center of the edge a of the first engagement portion 11 (shown by the upper right black dot in fig. 10) and the arc center of the edge B of the second engagement portion 21 (shown by the lower right black dot in fig. 10) are the same distance d as the center of the bevel gear (shown by the middle black dot in fig. 10) in the cross section of the bevel gear, that is, 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 with the center of the bevel gear as the center of the circle. In this case, during the transmission of the transmission structure including the bevel gear, the operation is smooth and the vibration is small.

Alternatively, as shown in fig. 11, only the edge of the engagement portion is indicated by a simple line in fig. 11, the structure of a rolling member or the like is not shown, the bevel gear further includes a gear tooth connection portion 70 between the gear tooth 10 and the gear tooth socket 20, and in the cross section of the bevel gear, a first distance is provided between the arc center (shown as a left black point in fig. 11) of the edge a of the first engagement portion 11 and the center (not shown in fig. 11) of the bevel gear, and a second distance is provided between the arc center (shown as a right black point in fig. 11) of the edge B of the second engagement portion 21 and the center of the bevel gear, the second distance being smaller than the first distance. That is, in the azimuth of the cross section of the bevel gear (refer to the azimuth shown in fig. 11), 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 bevel gear. In this case, there is a speed change and vibration effect during the transmission of the transmission structure including the bevel gear.

Further, as shown in fig. 11, in the cross section of the bevel gear, 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 bevel gear and other transmission elements can be further increased.

Further, in the embodiment of the present disclosure, as shown in fig. 11, 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 bevel gear, 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 bevel gear and the other transmission elements.

Alternatively, in the embodiment of the present disclosure, as shown in fig. 10, 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 bevel gear and the other transmission element is further increased.

Alternatively, the bevel gears in the embodiments of the present disclosure may be straight bevel gears or helical bevel gears.

When the bevel gear is a straight bevel gear as shown in fig. 1, as shown in fig. 12, on a circular surface (indicated by a broken line circle in fig. 12) perpendicular to the axis of the bevel gear and centered on the axis, the projected extending direction (indicated by a broken line straight line in fig. 12) of the gear teeth 10 is the radial direction of the circular surface passing through one end of the gear teeth 10. Only one tooth 10 is illustrated in fig. 12.

When the bevel gear is a bevel gear, as shown in fig. 13, on a circular surface (shown by a dotted line circle in fig. 13) perpendicular to the axis of the bevel gear and centered on the axis, at least a part of the projection extending direction (shown by a dotted line in fig. 13) of the gear teeth 10 has a second included angle with the radial direction of the circular surface passing through one end of the gear teeth 10, the second included angle is greater than 0 ° and less than 90 °, and may be selected to be 10 ° to 45 °. Only one tooth 11 is shown in fig. 13 as an example.

Alternatively, the projected extension path of the gear teeth 10 on a circular surface perpendicular to the axis of the bevel gear and centered on the axis is a curve (e.g., an arc), a broken line (e.g., a chevron), or a straight line. In the example shown in fig. 13, the projected extending path of the gear teeth 10 is a straight line on a circular surface perpendicular to the axis of the bevel gear and centered on the axis.

Optionally, the bevel gear 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 gear teeth 10 numbers being selectable. Gears in the prior art are involute gears, if the number of gear teeth is small, the undercut problem can occur, while bevel gears in the embodiment of the disclosure are engaged by the engagement surfaces, and no undercut problem can occur no matter a plurality of gear teeth 10 are arranged.

In addition, the embodiment of the disclosure also provides a transmission structure, which comprises two bevel gears capable of being meshed with each other, wherein at least one of the two bevel gears is the bevel gear. For example, when one of the bevel gears is the one described above, the other bevel gear may be a gear that matches its shape without providing rolling members.

When the first angle between the extension line of the bevel gears and the axis is changed, the engagement angle between the two bevel gears is changed, and the person skilled in the art can select according to actual needs. An engagement angle of greater than 0 degrees, less than or equal to 90 degrees, for example, 30 degrees, 45 degrees, 60 degrees, 90 degrees, etc., may be achieved between two bevel gears in embodiments of the present disclosure.

The two bevel gears can be straight bevel gears or bevel gears, and specific parameters of the two bevel gears can be set according to actual needs by a person skilled in the art so that the two bevel gears can be meshed.

Optionally, the transmission structure of the embodiments of the present disclosure may further include a transmission element (component for driving the gear to rotate) and/or a structural member, which is integrally formed with the main structural portion of the bevel gear. The above main structural part may include a structure inside the gear teeth 10 and the gear grooves 20, a part of the gear teeth 10 or the gear grooves 20 other than the rolling member 30 (or rolling member and guide member, or rolling member, fixed shaft, guide member, etc.).

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

The main body structure of the bevel gear in embodiments of the present disclosure may be machined by milling, and thus, the transmission elements and/or structural members may be integrally formed with the main body structure. Of course, when other parts are needed to be matched with the bevel gear, the bevel gear and the bevel gear can be made into an integral part, the number of assembly stages is reduced, the number of parts is greatly reduced, the number of assembly stages is greatly reduced, the multi-stage assembly precision error is greatly reduced, various comprehensive instabilities are greatly reduced, the number of fasteners or positioning parts is greatly reduced, and the integral part has stronger rigidity, and has stronger integral structure precision and retentivity.

The prior art of the old bevel gear is limited by several conventional processing modes, such as that other parts on the gear are required to be made into split parts and then are assembled independently. 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 the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "specific example," or "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 present application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly 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. A bevel gear, comprising: gear teeth and tooth sockets repeatedly distributed along the circumferential direction;

at least one of the first engaging portion and the second engaging portion serves as a rolling engaging portion including a plurality of rolling members arranged outside an edge thereof, the rolling members being rollable in an engaging direction, the plurality of rolling members constituting an engaging position of the rolling engaging portion.

2. The bevel gear according to claim 1, wherein the first engagement portion and the second engagement portion each function as a rolling engagement portion.

3. The bevel gear according to claim 2, wherein a first guide member having a first rolling space in which the rolling members roll in the meshing direction is provided on an outer side of the rolling meshing portion, the plurality of rolling members being placed in the first rolling space.

4. A bevel gear according to claim 3 wherein the first rolling space has a size slightly larger than the size of the rolling member in the extending direction of the rolling engagement portion, and the first guide restricts movement of the rolling member in the axial direction of the bevel gear.

5. The bevel gear according to claim 1, wherein only the first engagement portion acts as a rolling engagement portion.

6. The bevel gear according to claim 5 wherein the rolling engagement portion includes a centrally located fixed shaft having an axial direction parallel to an extending direction of the rolling engagement portion; the fixed shaft is provided with a second guide in the circumferential direction, the second guide has a second rolling space in which the rolling members roll in the meshing direction, and the plurality of rolling members are placed in the second rolling space.

7. The bevel gear according to claim 5, wherein a third guide member having a third rolling space in which the rolling members roll in the meshing direction is provided outside the rolling meshing portion, the plurality of rolling members being placed in the third rolling space.

8. Bevel gear according to any of claims 1-7, wherein the rolling elements are balls or needles.

9. The bevel gear according to any one of claims 1 to 7 wherein 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.

10. The bevel gear according to any one of claims 1 to 7, wherein the bevel gear comprises only the teeth and the tooth spaces, and wherein, in a cross section of the ring gear, 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 bevel gear.

11. The bevel gear according to any one of claims 1 to 7, further comprising a cogged connection between the cog and the cogged; a first distance is arranged between the arc center of the edge of the first meshing part and the center of the bevel gear on the cross section of the bevel gear, and a second distance is arranged between the arc center of the edge of the second meshing part and the center of the bevel gear; the bevel gear is an outer gear ring, the second distance is smaller than the first distance, or the bevel gear is an inner gear ring, and the second distance is larger than the first distance.

12. The bevel gear according to claim 11, wherein in a cross section of the bevel gear, the cogged connection comprises an outwardly convex first connection wire and an inwardly concave second connection wire connected end-to-end, the first connection wire being connected to the cog and the second connection wire being connected to the cog; the first connecting line and the second connecting line are arc lines.

13. The bevel gear according to claim 12 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.

14. The bevel gear according to any one of claims 1 to 7 wherein the edges of the first engagement portion and the edges of the second engagement portion are each arc of a circle having an arc of pi.

15. Bevel gear according to any of claims 1-7, wherein the projection of the gear teeth extends in a radial direction of a circular surface perpendicular to the axis of the bevel gear and centered on said axis past one end of the gear teeth.

16. Bevel gear according to any one of claims 1-7, wherein on a circular surface perpendicular to the axis of the bevel gear and centered on said axis, at least a part of the projected extension of the gear teeth has a second angle with the radial direction of the circular surface passing through one end of the gear teeth, said second angle being larger than 0 ° and smaller than 90 °.

17. The bevel gear according to claim 16, wherein the projected extension path of the gear teeth is a curve, a broken line, or a straight line on a circular surface perpendicular to the axis of the bevel gear and centered on the axis.

18. Bevel gear according to any of claims 1-7, wherein said bevel gear comprises at least two of said gear teeth.

19. A transmission structure comprising two intermeshing bevel gears, at least one of which is a bevel gear according to any one of claims 1 to 18.

20. The transmission structure according to claim 19, wherein the meshing angle of the two bevel gears is 30 °, 45 °, 60 °, or 90 °.