A helical gear with an oblique support

Abstract

The present invention discloses an oblique strut helical gear, the spoke plate portion of which comprises an inner ring body, a supporting body, a spoke plate body and a plurality of struts, the spoke plate body connecting the inner ring body and the supporting body and being in a circular ring shape around the axis of rotation of the helical gear, the plurality of struts being evenly distributed and arranged around the outer edge surface of the inner ring body, each strut extending upward and outwardly from the bottom of the inner ring body to the lower surface of the spoke plate body; the oblique strut helical gear is not only lighter in weight, but also has a structure that meets stress and deformation requirements, thereby achieving lightweighting while ensuring that stress requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of gear transmission, and in particular to an oblique pillar helical gear. Background Art

[0002] The transmission system is one of the three key moving parts of a helicopter. It is an essential power transmission component for the power output of the turboshaft engine. Its performance largely determines the overall performance of the helicopter. As the core component of the transmission system, gears / gear trains have always attracted the attention of researchers. In terms of gear design optimization, domestic and foreign scholars have carried out preliminary research. These studies mainly focus on the dimensional optimization of conventional solid gears. Most of the research was conducted under simple working conditions and single disciplines, and the weight reduction potential of advanced optimization design technologies has not been fully explored. In particular, as the transmission system's demand for reducer power transmission has increased significantly, the loads borne by the gears have become larger and more complex, the structural size and weight of the gears have become larger and heavier, the dynamic problems have become more prominent, and the demand for lightweight design under complex working conditions has become more urgent. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and to provide a helical strut helical gear having an innovative configuration and being able to achieve lightweight while meeting stress requirements.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A helical gear with inclined pillars, comprising a shaft connecting portion, a spoke plate portion and a helical tooth portion connected to each other as one body, the lower surface of the helical tooth portion away from the tooth top being a conical ring surface, the spoke plate portion comprising an inner ring body, a supporting body, a spoke plate body and a plurality of pillars; the inner ring body is in the shape of a circular ring around the rotation axis of the helical gear and is arranged outside the shaft connecting portion; the supporting body has a supporting portion for supporting the lower surface of the helical tooth portion and is in the shape of a circular ring around the rotation axis, and has an outer peripheral portion extending downward from the outer edge of the supporting portion; the spoke plate body connects the inner ring body and the supporting body, and is in the shape of a circular ring around the rotation axis; a plurality of the pillars are evenly distributed and arranged around the outer edge surface of the inner ring body, and each of the pillars extends upward and outward from the bottom of the inner ring body to the lower surface of the spoke plate body.

[0006] Furthermore, the pillar includes a column and a connecting portion; the column is cylindrical, with its lower end connected to the inner ring body and its upper end connected to the connecting portion; the connecting portion connects the column and the lower surface of the spoke body, and its outer surface is in an outward-expanding arc transition shape from bottom to top between the column and the spoke body.

[0007] Furthermore, the lower edge of the connecting portion connected to the column starts from the inner ring body and extends upward and outward in an inclined manner.

[0008] Furthermore, the upper end of the inner ring body is lower than the connection between the pillar and the lower surface of the spoke body; the upper end of the shaft connection part is higher than the upper end of the inner ring body and is connected to the inner edge of the spoke body; the connecting part is connected to the upper end of the inner ring body and forms a gap with the outer surface of the shaft connection part.

[0009] Furthermore, the circle formed by the outer surface of the column extending and intersecting with the lower surface of the spoke body is located between the inner ring body and the supporting body and is relatively closer to the inner ring body.

[0010] Furthermore, the lowest point of the lower edge where the column is connected to the outer surface of the inner ring body is higher than the lower end of the inner ring body.

[0011] Furthermore, the number of the pillars is 10.

[0012] Furthermore, in the supporting body, the upper surface and the lower surface of the supporting part respectively intersect with a vertical section passing through the rotation axis and forming the pillar symmetry plane to form a first straight line segment and a second straight line segment, the first straight line segment and the second straight line segment are parallel and both are inclined to the rotation axis; the outer edge surface and the inner edge surface of the outer peripheral part respectively intersect with the vertical section to form a third straight line segment and a fourth straight line segment, the third straight line segment and the fourth straight line segment are parallel and both are parallel to the rotation axis; the upper surface and the lower surface of the spoke body respectively intersect with the vertical section to form a fifth straight line segment and a sixth straight line segment, the fifth straight line segment and the sixth straight line segment are parallel and both are perpendicular to the rotation axis; the outer edge surface and the inner edge surface of the inner ring body respectively intersect with the vertical section to form a seventh straight line segment and an eighth straight line segment, the seventh straight line segment and the eighth straight line segment are parallel and both are parallel to the rotation axis; the outer edge surface and the inner edge surface of the shaft connecting part respectively intersect with the vertical section to form a ninth straight line segment and a tenth straight line segment, the ninth straight line segment and the tenth straight line segment are parallel and both are parallel to the rotation axis.

[0013] Furthermore, in the pillar, the outer surface of the column intersects with the vertical section to form an eleventh straight line segment, and the outer surface of the connecting portion intersects with the vertical section to form a first arc segment; the lower end of the eleventh straight line segment is connected to the outer edge surface of the inner ring body, and the upper end is connected to the first arc segment; the first arc segment connects the eleventh straight line segment and the sixth straight line segment.

[0014] Furthermore, when the tangential component of the meshing force on the helical gear teeth is less than or equal to 81000N, the axial component of the meshing force is less than or equal to 23000N, the radial component of the meshing force is less than or equal to 53000N, and the rotation speed is less than or equal to 323rpm, if the total mass of the helical tooth portion is less than or equal to 8kg, the yield strength of the material used for the web portion is greater than or equal to 900Mpa and the material density is less than or equal to 7.86g / cm3, then when and When , the following parameters of the web portion are: ; ; ; ; ; ; ; ; ; ; ; ;in, is the radius of the outer edge of the spoke body, in units of ; is the radius of the outer edge of the web portion, in units of ; is the distance from the inner edge of the inner ring to the rotation axis, in units of ; The distance from the center of the circle formed by the outer surface of the cylinder extending and intersecting the lower surface of the spoke to the rotation axis, in units of ; is the distance from the fifth straight line segment to the lower end of the inner ring body, in units of ; is the distance from the fifth straight line segment to the sixth straight line segment, in units of ; is the distance from the first straight line segment to the second straight line segment, in units of ; is the distance from the third straight line segment to the fourth straight line segment, in units of ; is the distance from the seventh straight line segment to the eighth straight line segment, in units of ; is the distance from the upper end to the lower end of the inner ring body, in units of ; is the distance from the upper edge to the lower edge of the outer periphery, in units of ; is the angle between the first straight line segment and the fifth straight line segment; is the angle between the extension line of the eleventh straight line segment and the sixth straight line segment; The radius of the circle formed by extending the outer surface of the cylinder and intersecting with the lower surface of the web body, in mm.

[0015] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0016] The oblique strut helical gear provided by the present invention has a spoke portion including several obliquely arranged struts connecting the inner ring body and the spoke body. When a thinner spoke body is used, the arrangement of the oblique struts makes the helical gear not only lighter in weight, but also has a structure that meets the stress and deformation requirements, thereby achieving the goal of lightweighting compared to the spoke in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of an oblique pillar helical gear provided by the present invention Figure 1 ;

[0019] Figure 2 A schematic diagram of the structure of an embodiment of an oblique pillar helical gear provided by the present invention Figure 2 ;

[0020] Figure 3 for Figure 1 A top view of the connecting portion of the central shaft and the spoke portion of the oblique strut helical gear;

[0021] Figure 4 for Figure 3 Schematic diagram of the geometric parameters of the central shaft connection part and the web part of the oblique pillar helical gear;

[0022] Figure 5 for Figure 3 A bottom view of the connecting portion of the central shaft and the spoke portion of the oblique strut helical gear;

[0023] Figure 6 for Figure 5 Schematic diagram of the middle AA section;

[0024] Figure 7 for Figure 5 Schematic diagram of the middle BB section;

[0025] Figure 8 for Figure 5 Schematic diagram of the middle CC section;

[0026] Figure 9 for Figure 1 Schematic diagram of the calculation results of the front equivalent stress on the spoke part of the helical gear with the inclined strut;

[0027] Figure 10 for Figure 1 Schematic diagram of the calculation results of the equivalent stress on the back side of the spoke plate part of the helical gear with inclined struts.

[0028] Description of main reference numerals:

[0029] A shaft connection portion 10;

[0030] The spoke portion 20; the inner ring 21; the spoke body 22; the supporting body 23; the supporting portion 231; the outer peripheral portion 232; the support 24; the column 241; the connecting portion 242;

[0031] helical tooth portion 30;

[0032] A first straight line segment 401 , a second straight line segment 402 , a third straight line segment 403 , a fourth straight line segment 404 , a fifth straight line segment 405 , a sixth straight line segment 406 , a seventh straight line segment 407 , an eighth straight line segment 408 , a ninth straight line segment 409 , a tenth straight line segment 410 , an eleventh straight line segment 411 , a first arc segment 412 , and a gap 501 . DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the claims, description and drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is for the purpose of distinguishing different objects rather than for describing a specific order.

[0035] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words such as the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0036] In the claims, description and above-mentioned drawings of the present invention, unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two parties, that is, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0037] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0038] Reference Figures 1 to 8 An embodiment of the present invention provides a helical strut helical gear, which includes a shaft connecting portion 10, a web portion 20 and a helical tooth portion 30 that are integrally connected to each other.

[0039] The lower surface of the helical tooth portion 30, facing away from the tooth crest, is a conical annular surface. This helical tooth portion 30 forms a helical tooth structure capable of meshing with other helical gears. The shaft connection portion 10 is a circular ring-shaped member used to mount the helical gear to a rotating shaft to enable rotation. The configuration of the helical tooth portion 30 and the shaft connection portion 10 is common knowledge in the art and will not be elaborated upon here.

[0040] In this embodiment, the spoke plate portion 20 includes an inner ring body 21, a supporting body 23, a spoke plate body 22 and a plurality of pillars 24; the inner ring body 21 is in a circular ring shape around the rotation axis of the helical gear and is arranged outside the shaft connection portion 10; the supporting body 23 has a supporting portion 231 for supporting the lower surface of the helical tooth portion 30 and is in a circular ring shape around the rotation axis, and has an outer peripheral portion 232 extending downward from the outer edge of the supporting portion 231; the spoke plate body 22 connects the inner ring body 21 and the supporting body 23, and is in a circular ring shape around the rotation axis; a plurality of the pillars 24 are evenly distributed and arranged around the outer edge surface of the inner ring body 21, and each of the pillars 24 extends upward and outward from the bottom of the inner ring body 21 to the lower surface of the spoke plate body 22.

[0041] Here, the directional pronouns in the specification and claims of the present invention are explained. In the helical gear, the extending direction of the rotation axis of the helical gear is the up-down direction. Since the helical gear is a rotating body, the direction radially outward with its rotation axis as the center is the direction from inside to outside. For details, please refer to Figure 6 As shown; at the same time, the rotation axis is also defined as radial and circumferential, the radial direction refers to the direction perpendicular to the rotation axis, and the circumferential direction refers to the direction around the rotation axis.

[0042] It should be noted that the vertical section passing through the rotation axis and forming the symmetry plane of the pillar 24 referred to in the specification of the present invention is represented by section AA in this embodiment, but can also be represented by other sections in other embodiments. However, it should be noted that only the one that forms the symmetry plane of the pillar 24 can be called the vertical section here.

[0043] Reference Figures 1 to 3 The support 24 includes a column 241 and a connecting portion 242. The column 241 is cylindrical, with its lower end connected to the inner ring body 21 and its upper end connected to the connecting portion 242. The connecting portion 242 connects the column 241 and the lower surface of the spoke body 22, and its outer surface forms an arc transition shape that expands outward from bottom to top between the column 241 and the spoke body 22. The lower edge of the connecting portion 242 connecting to the column 241 starts from the inner ring body 21 and extends upward and outward at an angle. The upper end of the inner ring body 21 is lower than the connection between the support 24 and the lower surface of the spoke body 22. The upper end of the shaft connecting portion 10 is higher than the upper end of the inner ring body 21 and connected to the inner edge of the spoke body 22. The connecting portion 242 is connected to the upper end of the inner ring body 21, and a gap 501 is formed between the connecting portion 242 and the outer surface of the shaft connecting portion 10. The circle formed by the outer surface of the column 241 extending and intersecting with the lower surface of the spoke body 22 is located between the inner ring body 21 and the supporting body 23 and is relatively closer to the inner ring body 21. The lowest point of the lower edge of the column 241 connecting to the outer surface of the inner ring body 21 is higher than the lower end of the inner ring body 21.

[0044] In this embodiment, the number of the pillars 24 is ten.

[0045] Specifically, refer to Figures 6 to 8In the supporting body 23, the upper surface and the lower surface of the supporting portion 231 respectively intersect with a vertical section passing through the rotation axis and forming a symmetry plane of the pillar 24 to form a first straight line segment 401 and a second straight line segment 402, and the first straight line segment 401 and the second straight line segment 402 are parallel and both are inclined to the rotation axis; the outer edge surface and the inner edge surface of the peripheral portion 232 respectively intersect with the vertical section to form a third straight line segment 403 and a fourth straight line segment 404, and the third straight line segment 403 and the fourth straight line segment 404 are parallel and both are parallel to the rotation axis. The upper surface and the lower surface of the spoke body 22 intersect with the vertical section to form a fifth straight segment 405 and a sixth straight segment 406, respectively. The fifth straight segment 405 and the sixth straight segment 406 are parallel and both are perpendicular to the rotation axis; the outer edge surface and the inner edge surface of the inner ring body 21 intersect with the vertical section to form a seventh straight segment 407 and an eighth straight segment 408, respectively. The seventh straight segment 407 and the eighth straight segment 408 are parallel and both are parallel to the rotation axis; the outer edge surface and the inner edge surface of the shaft connecting part 10 intersect with the vertical section to form a ninth straight segment 409 and a tenth straight segment 410, respectively. The ninth straight segment 409 and the tenth straight segment 410 are parallel and both are parallel to the rotation axis. In the pillar 24, the outer surface of the column 241 intersects with the vertical section to form an eleventh straight line segment 411, and the outer surface of the connecting portion 242 intersects with the vertical section to form a first arc segment 412; the lower end of the eleventh straight line segment 411 is connected to the outer edge surface of the inner ring body 21, and the upper end is connected to the first arc segment 412; the first arc segment 412 connects the eleventh straight line segment 411 and the sixth straight line segment 406.

[0046] Among them, reference Figure 6 The thickness of the shaft connecting part 10 is slightly thinner than the inner ring body 21. The outer edge surface of the shaft connecting part 10 is connected to the inner ring surface of the inner ring body 21, and the lower end of the shaft connecting part 10 is located above the lower end of the inner ring body 21, which makes the shaft connecting part 10 and the inner edge surface of the inner ring body 21 cooperate to form a step-like structure; at the same time, it should be noted that the upper end of the shaft connecting part 10 is slightly lower than the upper surface of the spoke body 22. The spoke body 22 is roughly a circular thin plate component, and its inner edge surface is connected to the outer edge surface of the shaft connecting part 10.

[0047] The support 24 is composed of a column 241 and a connecting portion 242. The column 241 can be regarded as a cylindrical structure, which is integrally formed with the connecting portion 242. Figure 7 and Figure 8The connecting portion 242 is located between the column 241 and the lower surface of the spoke body 22, and is roughly elliptical and surrounds the upper position of the column 241. The outer surface of the connecting portion 242 is an outward-expanding arc transition shape, so that the connection between the pillar 24 and the spoke body 22 has better structural strength. If the contact portion between the pillar 24 and the lower surface of the spoke body 22 is a structure where two sharp straight lines intersect, stress may be concentrated in the contact portion, thereby reducing the structural strength. In this embodiment, the stress can be dispersed to the pillar 24 and the spoke body 22 through the provision of the connecting portion 242.

[0048] In this embodiment, the lower edge of the outer surface of the connecting portion 242 connected to the column 241 starts from the inner ring body 21 and extends upward and outward, which results in the connecting portion 242 being closer to the inner side, and the distance between its lower edge and the lower surface of the spoke body 22 is greater, so it can be referred to Figure 8 The connecting portion 242 is more curved as it approaches the inner side, and more gently curved as it approaches the outer side. At the innermost portion of the connecting portion 242, the outer surface of the connecting portion 242 meets the outer edge of the shaft connecting portion 10 and the upper end of the inner ring body 21, forming a gap 501. This gap 501 can reduce the weight of the helical gear without affecting its structural strength.

[0049] Because the helical gear is an integral structure, the column 241 in the support 24 does not actually exist. The column 241 is described here only to illustrate the structure of the support 24. The column 241 is cylindrical, so its outer surface can be surrounded by a circle. In this embodiment, the outer surface of the column 241 intersects with the lower surface of the spoke body 22 to form a circle. This circle is located between the inner ring body 21 and the support body 23, and is closer to the inner ring body 21. This, to a certain extent, limits the inclination angle and size of the support 24. These two parameters of the support 24 should be maintained within an appropriate range to enable the helical gear to achieve the purpose of reducing weight without affecting its structural strength.

[0050] In this embodiment, when the tangential component of the meshing force on the helical gear teeth is less than or equal to 81000N, the axial component of the meshing force is less than or equal to 23000N, the radial component of the meshing force is less than or equal to 53000N, and the rotational speed is less than or equal to 323rpm, if the total mass of the helical tooth portion 30 is less than or equal to 8kg, the yield strength of the material used for the web portion is greater than or equal to 900MPa and the material density is less than or equal to 7.86g / cm3, then and When , the following parameters of the web portion 20 are: ; ; ; ; ; ; ; ; ; ; ; ;in, is the radius of the outer edge of the spoke body 22, in units of ; is the radius of the outer edge of the web portion 20, in units of ; is the distance from the inner edge of the inner ring 21 to the rotation axis, in units of ; The distance from the center of the circle formed by the outer surface of the column 241 extending and intersecting the lower surface of the spoke body 22 to the rotation axis, in units of ; is the distance from the fifth straight line segment 405 to the lower end of the inner ring body 21, in units of ; is the distance from the fifth straight line segment 405 to the sixth straight line segment 406, in units of ; is the distance from the first straight line segment 401 to the second straight line segment 402, in units of ; is the distance from the third straight line segment 403 to the fourth straight line segment 404, in units of ; is the distance from the seventh straight line segment 407 to the eighth straight line segment 408, in units of ; is the distance from the upper end to the lower end of the inner ring body 21, in units of ; is the distance from the upper edge to the lower edge of the outer periphery, in units of ; is the angle between the first straight line segment 401 and the fifth straight line segment 405; is the angle between the extension line of the eleventh straight line segment 411 and the sixth straight line segment 406; The radius of the circle formed by extending the outer surface of the column 241 and intersecting with the lower surface of the spoke body 22 is in mm.

[0051] Among them, it also includes the size limit of the supporting part 231 and the shaft connecting part 10, refer to Figure 6 , is the width of the supporting portion 231, and its value range is ; The height of the shaft connection part 10 is in the range of ; is the thickness of the shaft connection portion 10, and its value range is .

[0052] Specifically, taking 9310 steel with a density of 7.86g / cm3 as an example, the material yield strength is ≥940Mpa, the input load is taken as the maximum, and the total mass of the gear tooth area is taken as 7.9kg. The corresponding dimensional parameters are: , , , , , , .

[0053] The web portion 20 provided in this embodiment is subjected to static analysis, with a grid unit size of 2 mm and a grid unit number of 1304386. The cloud diagram of the calculated equivalent stress (von-Mises stress) is shown in FIG. Figure 9 and Figure 10 As shown. The calculation results show that under different working conditions, the maximum von-Mises stress at the helical gear spokes is between 432.73Mpa and 496.45Mpa. Compared with this embodiment, a comparative example is designed. This comparative example is based on this embodiment, but the difference is that the first spoke 21 and the second spoke 22 are solid structures. According to the calculation, the area of ​​the helical gear spoke 22 in this comparative example is 16.642×10 6 mm³, and its mass is 130.804 kg. The volume of the web portion 20 of this embodiment is 3.392×10 6 mm³, and a mass of 26.663 kg, which is 79.616% lower than that of the control group.

[0054] The oblique strut helical gear provided by the present invention has a greatly reduced volume and mass compared to existing helical gears while maintaining a large margin in mechanical properties. This can promote the lightweighting of transmission system gears and thereby improve the overall performance of the helicopter, and can also significantly save materials and reduce costs.

[0055] The above description and embodiments are intended to explain the scope of protection of the present invention, but do not constitute a limitation thereto. Modifications, equivalent substitutions, or other improvements to the embodiments of the present invention or portions thereof that can be obtained by a person of ordinary skill in the art through logical analysis, reasoning, or limited experimentation based on the teachings of the present invention or the above embodiments, combined with common knowledge, ordinary technical knowledge in the field, and / or prior art, should all be included within the scope of protection of the present invention.

Claims

1. An oblique strut helical gear, comprising a shaft connecting portion (10), a web portion (20), and an oblique tooth portion (30) connected to each other as one body, wherein the lower surface of the oblique tooth portion (30) facing away from the tooth top is a conical ring surface, and is characterized in that: The spoke portion (20) comprises an inner ring body (21), a supporting body (23), a spoke body (22) and a plurality of pillars (24); The inner ring body (21) is in the shape of a ring around the rotation axis of the helical gear and is arranged outside the shaft connection portion (10); The supporting body (23) has a supporting portion (231) for supporting the lower surface of the helical tooth portion (30) and in a circular ring shape around the rotation axis, and has an outer peripheral portion (232) extending downward from the outer edge of the supporting portion (231); The spoke body (22) connects the inner ring body (21) and the supporting body (23), and is in the shape of a ring around the rotation axis; A plurality of the pillars (24) are evenly distributed and arranged around the outer edge of the inner ring body (21), and each of the pillars (24) extends upward and outwardly from the bottom of the inner ring body (21) to the lower surface of the spoke body (22); The support (24) includes a column (241) and a connecting portion (242); the column (241) is cylindrical, with its lower end connected to the inner ring body (21) and its upper end connected to the connecting portion (242); the connecting portion (242) connects the column (241) and the lower surface of the spoke body (22), and its outer surface is in an outwardly expanding arc transition shape from bottom to top between the column (241) and the spoke body (22); The circle formed by the outer surface of the column (241) extending and intersecting with the lower surface of the spoke body (22) is located between the inner ring body (21) and the supporting body (23) and is relatively closer to the inner ring body (21).

2. The helical gear according to claim 1, wherein: The lower edge of the connecting portion (242) connected to the column (241) starts from the inner ring body (21) and extends upward and outward in an inclined manner.

3. The helical gear according to claim 2, wherein: The upper end of the inner ring body (21) is lower than the connection between the support (24) and the lower surface of the spoke body (22); the upper end of the shaft connecting portion (10) is higher than the upper end of the inner ring body (21) and is connected to the inner edge of the spoke body (22); the connecting portion (242) is connected to the upper end of the inner ring body (21) and forms a gap (501) with the outer surface of the shaft connecting portion (10).

4. The helical gear according to claim 3, wherein: The lowest point of the lower edge where the column (241) is connected to the outer surface of the inner ring body (21) is higher than the lower end of the inner ring body (21).

5. The helical gear according to claim 4, wherein: The number of the pillars (24) is 10.

6. The helical gear according to claim 5, wherein: In the supporting body (23), the upper surface and the lower surface of the supporting portion (231) respectively intersect with a vertical section passing through the rotation axis and forming a symmetry plane of the pillar (24) to form a first straight line segment (401) and a second straight line segment (402), the first straight line segment (401) and the second straight line segment (402) are parallel and both are inclined to the rotation axis; the outer edge surface and the inner edge surface of the peripheral portion (232) respectively intersect with the vertical section to form a third straight line segment (403) and a fourth straight line segment (404), the third straight line segment (403) and the fourth straight line segment (404) are parallel and both are parallel to the rotation axis; The upper surface and the lower surface of the spoke body (22) intersect with the vertical section to form a fifth straight line segment (405) and a sixth straight line segment (406), respectively; the fifth straight line segment (405) and the sixth straight line segment (406) are parallel and both are perpendicular to the rotation axis; The outer edge surface and the inner edge surface of the inner ring body (21) intersect with the vertical section to form a seventh straight line segment (407) and an eighth straight line segment (408), respectively. The seventh straight line segment (407) and the eighth straight line segment (408) are parallel and both are parallel to the rotation axis. The outer edge surface and the inner edge surface of the shaft connecting portion (10) intersect with the vertical section to form a ninth straight line segment (409) and a tenth straight line segment (410), respectively. The ninth straight line segment (409) and the tenth straight line segment (410) are parallel and both are parallel to the rotation axis.

7. The helical gear according to claim 6, wherein: In the pillar (24), the outer surface of the column (241) intersects with the vertical section to form an eleventh straight line segment (411), and the outer surface of the connecting portion (242) intersects with the vertical section to form a first arc segment (412); the lower end of the eleventh straight line segment (411) is connected to the outer edge surface of the inner ring body (21), and the upper end is connected to the first arc segment (412); the first arc segment (412) connects the eleventh straight line segment (411) and the sixth straight line segment (406).

8. The helical gear according to claim 7, wherein: When the tangential component of the meshing force on the helical gear teeth is less than or equal to 81000N, the axial component of the meshing force is less than or equal to 23000N, the radial component of the meshing force is less than or equal to 53000N, and the rotation speed is less than or equal to 323rpm, if the total mass of the helical tooth portion (30) is less than or equal to 8kg, the yield strength of the material used for the web portion is greater than or equal to 900Mpa and the material density is less than or equal to 7.86g / cm 3 ,but when and hour, The following parameters of the web portion (20) are: ； ； ； ； ； ； ； ； ； ； ； ； in, is the radius of the outer edge of the spoke body (22), in units of ; is the radius of the outer edge of the web portion (20), in units of ; is the distance from the inner edge of the inner ring body (21) to the rotation axis, in units of ; The distance from the center of the circle formed by the outer surface of the column (241) extending and intersecting the lower surface of the spoke body (22) to the rotation axis, in units of ; is the distance from the fifth straight line segment (405) to the lower end of the inner ring body (21), in units of ; is the distance from the fifth straight line segment (405) to the sixth straight line segment (406), in units of ; is the distance from the first straight line segment (401) to the second straight line segment (402), in units of ; is the distance from the third straight line segment (403) to the fourth straight line segment (404), in units of ; is the distance from the seventh straight line segment (407) to the eighth straight line segment (408), in units of ; is the distance from the upper end to the lower end of the inner ring body (21), in units of ; is the distance from the upper edge to the lower edge of the outer periphery, in units of ; is the angle between the first straight line segment (401) and the fifth straight line segment (405); is the angle between the extension line of the eleventh straight line segment (411) and the sixth straight line segment (406); The radius of the circle formed by extending the outer surface of the column (241) and intersecting with the lower surface of the spoke body (22), in mm.

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