CN117432774A

CN117432774A - Gear ring and transmission structure

Info

Publication number: CN117432774A
Application number: CN202310890401.8A
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: CN219827633U; CN117432772A; CN117432760A; CN219809369U; CN117469361A; CN117469354A

Abstract

The embodiment of the disclosure discloses a gear ring and a transmission structure. Wherein, the ring gear includes: the ring teeth and the ring tooth grooves are repeatedly distributed along the circumferential direction; the ring tooth is provided with a first meshing part protruding outwards, and the ring tooth slot is provided with a second meshing part recessed inwards; on the cross section of the gear ring, the edges of the first meshing part and the second meshing part are arc-shaped; 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.

Description

Gear ring and transmission structure

Technical Field

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

Background

With the increasing demands of industry for high precision, small dimensions, there is an increasing demand for performance of the mechanical element, the ring gear.

The inventor finds that sliding friction is adopted in the meshing process of the gear ring in the prior art, the transmission resistance is large, the mechanical efficiency is required to be improved, involute meshing is adopted, the gear ring is always worn, the wear is not resistant, and the service life is required to be improved.

Disclosure of Invention

In view of this, the embodiment of the disclosure provides a gear ring and a transmission structure, which at least partially improves the mechanical efficiency of the transmission process and prolongs the service life of the gear ring.

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

1 the gear ring comprises: the ring teeth and the ring tooth grooves are repeatedly distributed along the circumferential direction;

the ring tooth is provided with a first meshing part protruding outwards, and the ring tooth slot is provided with a second meshing part recessed inwards; on the cross section of the gear ring, the edges of the first meshing part and the second meshing part are arc-shaped;

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.

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

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 ring includes only the ring teeth and the ring tooth grooves, 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 gear ring.

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

Optionally, on the cross section of the gear ring, the ring tooth connecting part comprises a first connecting wire which is connected end to end and protrudes outwards and a second connecting wire which is recessed inwards, the first connecting wire is connected with the ring tooth, and the second connecting wire is connected with the ring tooth groove; 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 ring gear is parallel to the axis of the ring gear; or, a first included angle is formed between the extending direction of at least one part of the ring teeth and the axis of the gear ring, and the first included angle is larger than 0 degrees and smaller than 90 degrees.

Optionally, the extension path of the ring teeth is a curve, a broken line or a straight line.

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

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

the transmission structure comprises at least one gear ring as claimed in any one of the above, and at least one transmission element matched with the gear ring.

Optionally, the transmission structure includes a plurality of identical transmission elements, and at the same time, a part of the transmission elements are fully meshed with the gear ring, and a gap exists between another part of the transmission elements and the gear ring.

Optionally, the transmission structure comprises at least one transmission element group, the transmission element group comprises two identical transmission elements, and at the same time, the meshing positions of the two transmission elements in the transmission element group and the gear ring are opposite.

Optionally, the transmission structure comprises at least one transmission element group, the transmission element group comprises two identical transmission elements, and at the same time, the meshing positions of the two transmission elements in the transmission element group and the gear ring are identical.

The embodiment of the disclosure provides a gear ring and a transmission structure, on one hand, the ring gear is provided with a first meshing part protruding outwards, the ring tooth groove is provided with a second meshing part recessed inwards, on the cross section of the gear ring, the edge of the first meshing part and the edge of the second meshing part are arc-shaped, on the extending direction of the gear ring, the edge of the first meshing part forms a first meshing surface, the edge of the second meshing part forms a second meshing surface, in the using process of the gear ring, the first meshing surface or the second meshing surface is meshed with other transmission elements, and the first meshing surface or the second meshing surface is meshed with other transmission elements, but not involute meshing in the prior art, the surface is worn in the transmission process, the contact area is increased, the wear resistance is improved, the service life is effectively prolonged, the tooth shape of the ring gear is firmer, the tooth shape of the ring gear can be made larger and firmer under the same modulus, and the strength and the wear resistance are improved; on the other hand, since at least one of the first engagement portion and the second engagement portion serves as a rolling engagement portion, the rolling engagement portion includes a plurality of rolling members arranged on one side of the outer side of the edge thereof, the rolling members can roll in the engagement direction of the ring gear, the plurality of rolling members constitute the engagement position of the first engagement portion and/or the second engagement portion, and during use of the ring gear, the rolling members roll in the engagement direction of the ring gear, thereby rolling friction is generated between the ring gear and the matched transmission element, transmission resistance is small, and 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 illustration of a ring gear provided by an embodiment of the present disclosure;

FIG. 2 is an enlarged partial view of a first ring gear provided in an embodiment of the present disclosure;

FIG. 3 is an enlarged partial view of a second ring gear provided in an embodiment of the present disclosure;

FIG. 4 is an enlarged partial view of a third ring gear provided in an embodiment of the present disclosure;

FIG. 5 is an enlarged partial view of a fourth ring 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 ring 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 an edge of a first engagement portion of a first ring gear provided in an embodiment 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 an enlarged partial schematic view of a ring gear provided in an embodiment of the present disclosure;

FIG. 11 is a second enlarged partial schematic view of a ring gear provided in an embodiment of the present disclosure;

fig. 12 is a schematic view of meshing positions of a ring gear and two gears 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 present disclosure provides a ring gear, specifically, as shown in fig. 1, in which ring teeth and ring tooth grooves are shown only with simple lines in fig. 1, the ring gear including ring teeth 10 and ring tooth grooves 20 repeatedly arranged in a circumferential direction, specifically, the ring teeth 10 and ring tooth grooves 20 have the following structure:

as shown in fig. 2 to 5, the ring tooth 10 has a first engagement portion 11 protruding outward, and the ring tooth slot 20 has a second engagement portion 21 recessed inward; the edges of the first engagement portion 11 and the edges of the second engagement portion are arc-shaped in the cross section of the ring gear.

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 edge, the rolling members 30 being rollably in an engaging direction of the ring gear (a direction indicated by an arrow in the drawing), the plurality of rolling members 30 constituting engaging positions 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 rolling elements 30 may be distributed outside the entire rolling engagement portion, i.e., all engagement positions of the rolling engagement portion are the rolling elements 30; alternatively, the rolling elements 30 are distributed at a partial position outside the rolling engagement portion, that is, a partial engagement position of the rolling engagement portion is the rolling elements 30.

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

on the one hand, the ring tooth 10 is provided with a first meshing part 11 protruding outwards, the ring tooth slot 20 is provided with a second meshing part 21 recessed inwards, the edge of the first meshing part 11 and the edge of the second meshing part 21 are arc-shaped on the cross section of the ring gear, the edge of the first meshing part 11 forms a first meshing surface in the extending direction of the ring gear, the edge of the second meshing part 21 forms a second meshing surface, during the use process of the ring gear, the first meshing surface or the second meshing surface is meshed with other transmission elements, and the first meshing surface or the second meshing surface is meshed with other transmission elements, but not involute meshing in the prior art, the surface is worn in the transmission process, the contact area is increased, the contact area is more wear-resistant, the service life is effectively prolonged, the tooth shape of the ring tooth 10 is firmer, the ring tooth can be made larger and firmer under the same modulus, and the strength and the wear resistance are 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 on the outer side of the edge thereof, the rolling members 30 can roll in the engaging direction of the ring gear, the plurality of rolling members 30 constitute the engaging position of the rolling engaging portion, and during use of the ring gear, the rolling members 30 roll in the engaging direction of the ring gear, thereby making rolling friction between the ring gear and the matched transmission member, reducing transmission resistance, and greatly improving mechanical efficiency.

In addition, it should be added that the gear ring applied in the embodiments of the present disclosure further 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 the ring gear.

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 ring 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.

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 members 30, that is, each first guiding member 40 only places one row of rolling members 30, and the first guiding member 40 restricts the movement of the rolling members 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. 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 (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 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 outer side of the rolling engagement portion is provided with the third guide having the third rolling space in which the rolling members 30 roll in the engagement direction, 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 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 elements 30, 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 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, the person skilled in the art may also set only the second engagement portion 21 as a rolling engagement portion, and the specific structure may be set with reference to the case where only the first engagement portion 21 is 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, 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, that is, the ring teeth 10 and the ring tooth grooves 20 of the ring gear are the same or similar in size. The size range of "slightly larger" may be selected by those skilled in the art according to actual needs, 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. 10, only the edge of the meshing portion is indicated by a simple line in fig. 10, the structure of the rolling member or the like is not shown, the ring gear includes only the ring tooth 10 and the ring tooth groove 20, and in the cross section of the ring gear, the arc center of the edge a of the first meshing portion 11 (shown by a right-hand black dot in fig. 10) and the arc center of the edge B of the second meshing portion 21 (shown by a left-hand black dot in fig. 10) are the same distance as the center of the ring gear (not shown in fig. 10), that is, in the orientation shown in fig. 10, the arc center of the edge a of the first meshing portion 11 and the arc center of the edge B of the second meshing portion 21 are on the same circumference centered around the center of the ring gear. In this case, during the transmission of the transmission structure including the ring 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 the rolling member or the like is not shown, the ring gear further includes a ring gear connecting portion 70 between the ring gear 10 and the ring gear groove 20, and in the cross section of the ring gear, a first distance is provided between the arc center (shown by a left black dot in fig. 11) of the edge a of the first engagement portion 11 and the center (not shown in fig. 11) of the ring gear, and a second distance is provided between the arc center (shown by a right black dot in fig. 11) of the edge B of the second engagement portion 21 and the center of the ring gear, and the second distance is smaller than the first distance when the ring gear is an outer ring gear as shown in fig. 11, and is larger than the first distance when the ring gear is an inner ring gear. That is, in the orientation of the cross section of the ring gear (refer to the orientation 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 ring gear. In this case, there is a speed change and shock effect during the transmission of the transmission structure including the ring gear.

Further, as shown in fig. 11, in the cross section of the ring gear, the ring gear 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 ring gear 10, the second connecting line 72 being connected to the ring gear slot 20, the first connecting line 71 and the second connecting line 72 being arc lines. With the above structure of the ring gear connecting portion 70, the meshing area between the ring gear and the other transmission element 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 ring gear, the first connection line 71 or the second connection line 72 also meshes with other transmission elements, thereby further increasing the meshing area between the ring 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 of pi, that is, half of the entire circumference, so that the engagement area between the ring gear and the other transmission element is further increased.

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

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

In addition, the embodiment of the disclosure also provides a transmission structure, which comprises at least one gear ring and at least one transmission element matched with the gear ring. That is, the transmission element includes a convex portion and a concave portion arranged in a circumferential or extending direction, the convex portion has a third engagement portion protruding outward, an edge of the third engagement portion is an arc line, the concave portion has a fourth engagement portion recessed inward, and an edge of the fourth engagement portion is an arc line. During the transmission of the transmission structure, the third engagement portion is engaged with the second engagement portion 21, or the fourth engagement portion is engaged with the first engagement portion 11.

The transmission element may be a gear, a rack, etc., and is not limited herein. In the embodiment of the present disclosure, the size, number, shape of the ring gears, and the types, sizes, numbers, shapes, etc. of the transmission elements included in the transmission structure are not limited, and may be selected by those skilled in the art according to actual needs.

In the embodiments of the present disclosure, when the transmission structure includes a plurality of transmission elements, there are a plurality of ways in which the ring gear may be engaged with the transmission elements, and the embodiments of the present disclosure are illustrated by way of example.

Alternatively, the transmission structure includes a plurality of identical transmission elements, with one portion of the transmission elements fully engaged with the ring gear (with the ring teeth 10 fully engaged with the recesses, or with the ring teeth slots 20 fully engaged with the projections) and another portion of the transmission elements 20 having a gap with the ring gear (with the ring teeth 10 having a gap with the recesses, or with the ring teeth slots 20 having a gap with the projections) at the same time. This can be achieved in particular by adjusting the distance between the transmission elements and/or the relative position of the transmission elements and the ring gear when initially placed.

It should be noted that the above "same time" does not refer to a specific time, but refers to a time when the above meshing relationship exists between different transmission elements and the ring gear during transmission. In the whole transmission process, a plurality of moments are existed, taking two moments of a transmission element which are adjacent to each other, for example, if the transmission element is completely meshed with the gear ring in the current moment, a gap exists between the transmission element and the gear ring in the next moment, and if the transmission element is in a gap with the gear ring in the current moment, the transmission element is completely meshed with the gear ring in the next moment.

In the transmission process of the transmission structure with the structure, the meshing effect of different transmission elements and the gear ring can realize dynamic compensation, namely complete meshing and clearance, so that resonance reduction, more uniform stress, even stress surface and acting force, stable operation, double stress surface acting force sharing, more bearing capacity improvement effect and effective reduction of reverse clearance of a plurality of same transmission elements can be further improved.

Specifically, as shown in fig. 12, only the edge of the engagement portion is indicated by a simple line in fig. 12, the structure such as a rolling member is not shown, the transmission structure includes two identical gears, and at the same time, the upper gear is fully engaged with the ring gear (see the position indicated by the upper broken line circle in fig. 12), and a slight gap exists between the lower gear and the ring gear (see the position indicated by the lower broken line circle in fig. 12). In addition, it should be noted that the above dynamic compensation effect can be achieved regardless of whether the meshing positions of the two gears and the ring gear are similar (both concave-to-convex, or convex-to-concave) or opposite (one is concave-to-convex, and the other is convex-to-concave) at the same time.

Alternatively, in an embodiment of the present disclosure, the transmission structure includes at least one transmission element group including two identical transmission elements, the two transmission elements within the transmission element group being opposite to the meshing point of the ring gear at the same time. Taking the example that the transmission structure comprises two identical gears, the gear teeth (convex parts) of one gear are meshed with the ring tooth grooves 20 of the gear ring, the gear teeth (concave parts) of the other gear are meshed with the ring teeth 10 of the gear ring, and the gear teeth (convex parts) of the other gear are concave to concave. Based on the above situation, in the transmission process of the transmission structure, the meshing positions of the two gears and the gear ring are just opposite, so that the error is equally divided, and the running precision is improved.

It should be noted that the above "same time" does not refer to a specific time, but refers to a time when the above meshing relationship exists between different transmission elements and the ring gear during transmission.

Optionally, the transmission structure comprises at least one transmission element group comprising two identical transmission elements, the engagement points of the two transmission elements within the transmission element group with the ring gear being identical at the same time. Taking the example of a transmission structure comprising two identical gears, at the same moment, the teeth (projections) of the two gears are engaged with the ring teeth slots 20 of the gear ring, i.e. both are convex to concave, or, at the same moment, the teeth (recesses) of the two gears are engaged with the ring teeth 10 of the gear ring, i.e. both are concave to convex.

Optionally, the transmission structure in the embodiments of the present disclosure further includes at least one driving member (an element for driving the ring gear to rotate) and/or a structural member, and the driving member and/or the structural member are integrally formed with the main body structure portion of the ring gear. The above main structural portion may include a structure located inside the ring teeth 10 and the ring tooth grooves 20, a portion of the ring teeth 10 or the ring tooth grooves 20 other than the rolling members 30 (or rolling members and guides, or rolling members, fixed shafts, guides, 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 rings 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 ring gear 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 ring, the parts and the gear ring 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 layers is greatly reduced, the error of multi-stage assembly precision 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 has the limitation of a plurality of conventional processing modes, such as that other parts on the gear ring 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 ring gear, comprising: the ring teeth and the ring tooth grooves are repeatedly distributed along the circumferential direction;

2. The ring gear of claim 1, wherein the first engagement portion and the second engagement portion each function as a rolling engagement portion.

3. The ring 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 ring gear according to claim 3, wherein the first rolling space has a size slightly larger than that 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 ring gear.

5. The ring gear of claim 1, wherein only the first engagement portion acts as a rolling engagement portion.

6. The ring gear according to claim 5, wherein the rolling engagement portion includes a centrally located fixed shaft, an axial direction of which is 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 ring 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 on an outer side of the rolling meshing portion, the plurality of rolling members being placed in the third rolling space.

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

9. The ring gear of any of claims 1-7, wherein a radius of an edge of the second engagement portion is slightly greater than or equal to a radius of an edge of the first engagement portion.

10. The ring gear according to any one of claims 1 to 7, characterized in that the ring gear includes only the ring teeth and the ring tooth grooves, and 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 ring gear.

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

12. The ring gear of claim 11, wherein in a cross section of the ring gear, the ring gear connection comprises an outwardly convex first connection line connected with the ring gear and an inwardly concave second connection line connected with the ring gear slot; the first connecting line and the second connecting line are arc lines.

13. The ring gear of claim 12, wherein the first connecting line is an arc line co-rounded with an edge of the first engagement portion, and the second connecting line is an arc line co-rounded with an edge of the second engagement portion.

14. The ring gear of 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. The ring gear according to any one of claims 1 to 7, characterized in that the extending direction of the ring teeth is parallel to the axis of the ring gear; or, a first included angle is formed between the extending direction of at least one part of the ring teeth and the axis of the gear ring, and the first included angle is larger than 0 degrees and smaller than 90 degrees.

16. The ring gear of claim 15 wherein the path of extension of the ring gear is a curve, a broken line, or a straight line.

17. A gear ring according to any one of claims 1 to 7, wherein the gear ring comprises at least two of the ring teeth.

18. A transmission structure comprising at least one ring gear according to any one of claims 1 to 17 and at least one transmission element matching said ring gear.

19. A transmission structure according to claim 18, comprising a plurality of identical said transmission elements, wherein at the same time, a portion of said transmission elements are fully engaged with said ring gear and a portion of said transmission elements are in clearance with said ring gear.

20. A transmission arrangement according to claim 18, comprising at least one set of transmission elements, said set of transmission elements comprising two identical said transmission elements, said transmission elements of said set being in opposition to the meshing of said ring gear at the same time.

21. The transmission structure according to claim 18, characterized by comprising at least one transmission element group comprising two identical transmission elements, the engagement sites of the two transmission elements within the transmission element group and the ring gear being identical at the same time.