A double-chamber helical gear

Abstract

The present application discloses a dual-chamber helical gear, which includes a shaft connecting portion, a helical tooth portion and a spoke plate portion, wherein the spoke plate portion includes an inner ring body, a supporting body and three spoke plates connecting the inner ring body and the supporting body, and a chamber is formed between adjacent spoke plates. The above structure is not only lighter in weight, but also meets the stress and deformation requirements, and achieves lightweight compared to the spoke plates in the prior art.

Description

Technical Field

[0001] The present application relates to the field of gear transmission, and in particular to a double-chamber 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 this application is to overcome the above-mentioned defects or problems in the background technology and provide a dual-chamber helical gear with an innovative configuration and the ability to achieve lightweight while meeting stress requirements. To achieve the above-mentioned purpose, the following technical solutions are adopted:

[0004] A double-chamber helical gear, which includes a shaft connecting portion, a helical tooth portion and a spoke plate portion connected to each other as one body, the lower surface of the helical tooth portion facing away from the tooth top is a conical ring surface; the spoke plate portion includes an inner ring body, a supporting body, a first spoke plate, a second spoke plate and a third spoke plate, the inner ring body is in a circular ring shape around the rotation axis of the double-chamber helical gear, and is arranged outside the shaft connecting portion; the supporting body supports the lower surface of the helical tooth portion, the first spoke plate, the second spoke plate and the third spoke plate are arranged in sequence along the rotation axis and the first spoke plate is closest to the helical tooth portion; the first spoke plate, the second spoke plate and the third spoke plate are respectively connected to the inner ring body and the supporting body, a first chamber is formed between the first spoke plate and the second spoke plate, and a second chamber is formed between the second spoke plate and the third spoke plate.

[0005] Furthermore, a plurality of through holes are uniformly distributed along the circumferential direction on the first spoke plate, and the through holes are elliptical, with their major axes extending radially.

[0006] Furthermore, the number of the through holes is 14.

[0007] Furthermore, the upper surface, lower surface and outer edge surface of the supporting body respectively intersect with the cross-section passing through the rotation axis to form a first straight line segment, a second straight line segment and a third straight line segment, the first straight line segment is located on the lower surface of the bevel tooth portion, the second straight line segment is parallel to the first straight line segment, and the third straight line segment is parallel to the rotation axis.

[0008] Furthermore, the upper surface and lower surface of the first web intersect with the cross section to form a fourth straight line segment and a fifth straight line segment respectively, the fourth straight line segment is connected to the upper end surface of the inner ring body and is perpendicular to the rotation axis, and the fifth straight line segment is parallel to the fourth straight line segment.

[0009] Furthermore, the upper surface of the second spoke intersects with the cross section to form a first intersection line, and the first intersection line includes, from the inside to the outside, a sixth straight line segment, a seventh straight line segment, and an eighth straight line segment. The lower surface of the second spoke intersects with the cross section to form a second intersection line, and the second intersection line includes, from the inside to the outside, a ninth straight line segment parallel to the sixth straight line segment and a tenth straight line segment parallel to the seventh straight line segment; the sixth straight line segment is connected to the middle of the outer edge surface of the inner ring body and is perpendicular to the rotation axis; the seventh straight line segment is inclined outward and upward; and the eighth straight line segment is parallel to the rotation axis.

[0010] Furthermore, the upper surface of the third spoke intersects with the cross section to form a third intersection line, and the third intersection line includes, from the inside to the outside, an eleventh straight line segment, a twelfth straight line segment, and a thirteenth straight line segment in sequence, and the lower surface of the third spoke intersects with the cross section to form a fourth intersection line, and the fourth intersection line includes, from the inside to the outside, a fourteenth straight line segment parallel to the eleventh straight line segment, a fifteenth straight line segment parallel to the twelfth straight line segment, and a sixteenth straight line segment parallel to the thirteenth straight line segment; the fourteenth straight line segment is connected to the lower end of the inner edge surface of the inner ring body and is inclined outward and downward; the fifteenth straight line segment is perpendicular to the rotation axis; the sixteenth straight line segment is inclined outward and upward and is connected to the lower end of the outer edge surface of the support body.

[0011] Furthermore, the first chamber intersects with the cross section to form a fifth intersection line, and the fifth intersection line includes, in sequence, a fifth straight line segment, an eighth straight line segment, a seventh straight line segment, a sixth straight line segment and a seventeenth straight line segment located on the outer edge surface of the inner ring body; the second chamber intersects with the cross section to form a sixth intersection line, and the sixth intersection line includes, in sequence, a ninth straight line segment, a tenth straight line segment, a second straight line segment, a thirteenth straight line segment, a twelfth straight line segment, an eleventh straight line segment and an eighteenth straight line segment located on the outer edge surface of the inner ring body.

[0012] Furthermore, when the tangential component of the meshing force on the gear teeth of the dual-chamber helical gear 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 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 , then when 105≤R0≤110 and 250≤R1≤269.85, the following parameters of the web portion are: R2=0+38; R3=1+78.84; R4=1-37.84; R5=0+40; R6=1-67.77; H1=35.67; w0=87.67; w2=25; w3=4=10; w5=6=7=8=6; α=105°; β=130°; γ=150°; δ=165°; ψ=165.38°; a=40; b=16; wherein R0 is the radius of the inner edge of the inner ring, in mm; R1 is the radius of the outer edge of the supporting body, in mm; R2 is the distance from the intersection of the fourteenth straight line segment and the fifteenth straight line segment to the rotation axis, in mm; R3 is the The distance from the eighth straight line segment to the rotation axis is in mm; R4 is the distance from the intersection of the fifteenth straight line segment and the sixteenth straight line segment to the rotation axis, in mm; R5 is the distance from the center point of the through hole to the rotation axis, in mm; R6 is the distance from the intersection of the first straight line segment and the fourth straight line segment to the rotation axis, in mm; H1 is the distance from the fourth straight line segment to the sixth straight line segment, in mm; w0 is the distance from the fourth straight line segment to the fifteenth straight line segment. The distance between the line segments is in mm; w1 is the distance from the fourth straight line segment to the fifth straight line segment, in mm; w2 is the distance from the first straight line segment to the second straight line segment, in mm; w3 is the distance from the seventh straight line segment to the tenth straight line segment, in mm; w4 is the distance from the sixth straight line segment to the ninth straight line segment, in mm; w5 is the distance from the thirteenth straight line segment to the sixteenth straight line segment, in mm; w6 is the distance from the twelfth straight line segment to the fifteenth straight line segment, in mm; w7 is the distance from the eleventh straight line segment to the fourteenth straight line segment, in mm; w8 is the thickness of the inner ring body, in mm; α is the angle between the eighth straight line segment and the seventh straight line segment; β is the angle between the thirteenth straight line segment and the twelfth straight line segment; γ is the angle between the twelfth straight line segment and the eleventh straight line segment; δ is the angle between the seventh straight line segment and the sixth straight line segment; ψ is the angle between the first straight line segment and the fourth straight line segment; a is the major axis of the through hole, in mm; b is the minor axis of the through hole, in mm.

[0013] Compared with the prior art, the above solution has the following beneficial effects:

[0014] The double-chamber helical gear involved in this application has a spoke plate portion including three spoke plates connecting the inner ring body and the supporting body, and a chamber is formed between adjacent spoke plates. The above structure is not only lighter in weight, but also meets the stress and deformation requirements, and achieves lightweight compared to the spoke plates in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiment, the following briefly introduces the drawings required for use:

[0016] Figure 1 The three-dimensional structure of the double-chamber helical gear in the embodiment Figure 1 ;

[0017] Figure 2 The three-dimensional structure of the double-chamber helical gear in the embodiment Figure 2 ;

[0018] Figure 3 This is a front view of a double-chamber helical gear in an embodiment;

[0019] Figure 4 for Figure 3 AA section view;

[0020] Figure 5 for Figure 4 A partial enlarged view of part B.

[0021] Description of main reference numerals:

[0022] Double-chamber helical gear 1; shaft connecting portion 2; helical tooth portion 3; spoke portion 4; inner ring body 41; supporting body 42; first spoke 43; through hole 431; second spoke 44; third spoke 45; first chamber 46; second chamber 47; first straight line segment L1; second straight line segment L2; third straight line segment L3; fourth straight line segment L4; fifth straight line segment L5; sixth straight line segment L6; seventh straight line segment L7; eighth straight line segment L8; ninth straight line segment L9; tenth straight line segment L10; eleventh straight line segment L11; twelfth straight line segment L12; thirteenth straight line segment L13; fourteenth straight line segment L14; fifteenth straight line segment L15; sixteenth straight line segment L16; seventeenth straight line segment L17; eighteenth straight line segment L18. DETAILED DESCRIPTION

[0023] In the claims and the description, unless otherwise defined, the terms "first", "second" or "third", etc. are intended to distinguish different objects rather than to describe a specific order.

[0024] In the claims and the specification, unless otherwise specified, the terms "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are based on the directions and positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description, and do not imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction.

[0025] In the claims and description, unless otherwise specified, the term "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method in which there is no displacement relationship or 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.

[0026] In the claims and the description, unless otherwise defined, the terms "include", "have" and their variations mean "including but not limited to".

[0027] The technical solutions in the embodiments will be described clearly and completely below with reference to the accompanying drawings.

[0028] See also Figure 1 and Figure 2 , Figure 1 FIG. 1 shows a double-chamber helical gear 1 in an embodiment. Figure 1 and Figure 2 As shown, the double-chamber helical gear 1 includes a shaft connecting portion 2, a helical tooth portion 3 and a spoke portion 4. The lower surface of the helical tooth portion 3 facing away from the tooth top is a conical ring surface.

[0029] like Figure 4 and Figure 5 As shown, the spoke portion 4 includes an inner ring body 41, a supporting body 42, a first spoke 43, a second spoke 44 and a third spoke 45. The inner ring body 41 is in a circular shape around the rotation axis of the dual-chamber helical gear 1 and is arranged outside the shaft connection portion 2; the supporting body 42 supports the lower surface of the helical tooth portion 3, and the first spoke 43, the second spoke 44 and the third spoke 45 are arranged in sequence along the rotation axis and the first spoke 43 is closest to the helical tooth portion 3; the first spoke 43, the second spoke 44 and the third spoke 45 are respectively connected to the inner ring body 41 and the supporting body 42, a first chamber 46 is formed between the first spoke 43 and the second spoke 44, and a second chamber 47 is formed between the second spoke 44 and the third spoke 45.

[0030] The upper surface, lower surface and outer edge surface of the supporting body 42 respectively intersect with the cross section passing through the rotation axis to form a first straight line segment L1, a second straight line segment L2 and a third straight line segment L3. The first straight line segment L1 is located on the lower surface of the helical tooth portion 3, the second straight line segment L2 is parallel to the first straight line segment L1, and the third straight line segment L3 is parallel to the rotation axis.

[0031] like Figure 5 As shown, the upper and lower surfaces of the first spoke 43 intersect with the above-mentioned cross section to form a fourth straight line segment L4 and a fifth straight line segment L5, respectively. The fourth straight line segment L4 is connected to the upper end surface of the inner ring body 41 and is perpendicular to the rotation axis. The fifth straight line segment L5 is parallel to the fourth straight line segment L4. Figure 3 As shown, a plurality of through holes 431 are evenly distributed along the circumference of the first spoke 43. The through holes 431 are elliptical in shape, with their major axes extending radially. In this embodiment, the number of the through holes 431 is 14.

[0032] like Figure 5 As shown, the upper surface of the second spoke 44 intersects with the above-mentioned cross-section to form a first intersection line, and the first intersection line includes, from the inside to the outside, the sixth straight line segment L6, the seventh straight line segment L7 and the eighth straight line segment L8. The lower surface of the second spoke 44 intersects with the above-mentioned cross-section to form a second intersection line, and the second intersection line includes, from the inside to the outside, a ninth straight line segment L9 parallel to the sixth straight line segment L6 and a tenth straight line segment L10 parallel to the seventh straight line segment L7; the sixth straight line segment L6 is connected to the middle of the outer edge surface of the inner ring body 41 and is perpendicular to the rotation axis; the seventh straight line segment L7 is inclined outward and upward; and the eighth straight line segment L8 is parallel to the rotation axis.

[0033] like Figure 5 As shown, the upper surface of the third spoke 45 intersects with the above-mentioned cross section to form a third intersection line, and the third intersection line includes, from the inside to the outside, the eleventh straight line segment L11, the twelfth straight line segment L12 and the thirteenth straight line segment L13. The lower surface of the third spoke 45 intersects with the above-mentioned cross section to form a fourth intersection line, and the fourth intersection line includes, from the inside to the outside, a fourteenth straight line segment L14 parallel to the eleventh straight line segment L11, a fifteenth straight line segment L15 parallel to the twelfth straight line segment L12 and a sixteenth straight line segment L16 parallel to the thirteenth straight line segment L13; the fourteenth straight line segment L14 is connected to the lower end of the inner edge surface of the inner ring body 41 and is inclined outward and downward; the fifteenth straight line segment L15 is perpendicular to the rotation axis; the sixteenth straight line segment L16 is inclined outward and upward and is connected to the lower end of the outer edge surface of the supporting body 42.

[0034] like Figure 5 As shown, the first chamber 46 intersects with the above-mentioned cross-section to form a fifth intersection line, which includes in sequence the fifth straight line segment L5, the eighth straight line segment L8, the seventh straight line segment L7, the sixth straight line segment L6 and the seventeenth straight line segment L17 located on the outer edge surface of the inner ring body 41; the second chamber 47 intersects with the above-mentioned cross-section to form a sixth intersection line, which includes in sequence the ninth straight line segment L9, the tenth straight line segment L10, the second straight line segment L2, the thirteenth straight line segment L13, the twelfth straight line segment L12, the eleventh straight line segment L11 and the eighteenth straight line segment L18 located on the outer edge surface of the inner ring body 41.

[0035] In the dual-chamber helical gear 1 of this embodiment, when the tangential component of the meshing force on the 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 3 is less than or equal to 8kg, the yield strength of the material used for the web portion 4 is greater than or equal to 900Mpa and the material density is less than or equal to 7.86g / cm 3 , then when 105≤R0≤110 and 250≤R1≤269.85, the following parameters of the web portion 4 are: R2=0+38; R3=1+78.84; R4=1-37.84; R5=0+40; R6=1-67.77; H1=35.67; w0=87.67; w2=25; w3=4=10; w5=6=7=8=6; α=105°; β=130°; γ=150°; δ=165°; ψ=165.38°; a=40; b=16; wherein R0 is the radius of the inner edge of the inner ring 41, in mm; R1 is the radius of the outer edge of the supporting body 42, in mm; R2 is the distance from the intersection of the fourteenth straight line segment L14 and the fifteenth straight line segment L15 to the rotation axis, in mm; R3 is the distance from the eighth straight line segment L8 to the rotation axis distance, in mm; R4 is the distance from the intersection of the fifteenth straight line segment L15 and the sixteenth straight line segment L16 to the rotation axis, in mm; R5 is the distance from the center point of the through hole 431 to the rotation axis, in mm; R6 is the distance from the intersection of the first straight line segment L1 and the fourth straight line segment L4 to the rotation axis, in mm; H1 is the distance from the fourth straight line segment L4 to the sixth straight line segment L6, in mm; w0 is the distance from the fourth straight line segment L4 to the fifteenth straight line segment L15, in mm; w1 is the distance from the fourth straight line segment L4 to the fifteenth straight line segment L15, in mm; The distance from the straight line segment L4 to the fifth straight line segment L5 is in mm; w2 is the distance from the first straight line segment L1 to the second straight line segment L2, in mm; w3 is the distance from the seventh straight line segment L7 to the tenth straight line segment L10, in mm; w4 is the distance from the sixth straight line segment L6 to the ninth straight line segment L9, in mm; w5 is the distance from the thirteenth straight line segment L13 to the sixteenth straight line segment L16, in mm; w6 is the distance from the twelfth straight line segment L12 to the fifteenth straight line segment L15, in mm; w7 is the distance from the eleventh straight line segment L11 to the fourteenth straight line segment L14. The distance between the eighth straight line segment L8 and the seventh straight line segment L7 is in mm; w8 is the thickness of the inner ring body 41 is in mm; α is the angle between the eighth straight line segment L8 and the seventh straight line segment L7; β is the angle between the thirteenth straight line segment L13 and the twelfth straight line segment L12; γ is the angle between the twelfth straight line segment L12 and the eleventh straight line segment L11; δ is the angle between the seventh straight line segment L7 and the sixth straight line segment L6; ψ is the angle between the first straight line segment L1 and the fourth straight line segment L4; a is the major axis of the through hole 431, in mm; b is the minor axis of the through hole 431, in mm.

[0036] Specifically in this embodiment, R0=105, R1=269.85; the double-chamber helical gear 1 adopts a density of 7.86g / cm 3 The 9310 steel has a material yield strength greater than or equal to 940 MPa, and the input loads are all taken to be the maximum, that is, the tangential component of the meshing force is equal to 81000 N, the axial component of the gear meshing force is equal to 23000 N, the radial component of the gear meshing force is equal to 53000 N and the speed is equal to 323 rpm.

[0037] If the web portion 4 of the helical gear used in the same environment is solid, the volume of the web portion 4 is 16.119*10 6 mm 3 , with a mass of 126.692 kg. The volume of the web portion 4 of the helical gear 1 in this embodiment is 6.427*10 6 mm 3 , with a mass of 50.516kg. Compared with the known spoke plate, it has a smaller volume and lighter mass, and its mass can be reduced by 60.127%, achieving a good lightweight effect.

[0038] A static analysis of the dual-chamber helical gear 1 was conducted using a 2mm mesh size and 2,172,104 cells. The equivalent stress (von-Mises stress) on the web 4 ranged from 296.55 MPa to 317.23 MPa, significantly lower than the material's yield strength. Therefore, reliable operation is guaranteed.

[0039] The above description of the specification and embodiments is used to explain the scope of protection of the present application, but does not constitute a limitation on the scope of protection of the present application.

Claims

1. A double-chamber helical gear (1), comprising a shaft connecting portion (2), a helical tooth portion (3), and a spoke portion (4) connected to each other as one body, wherein the lower surface of the helical tooth portion (3) facing away from the tooth top is a conical ring surface; wherein: The spoke portion (4) comprises an inner ring body (41), a supporting body (42), a first spoke plate (43), a second spoke plate (44) and a third spoke plate (45); the inner ring body (41) is in the shape of a ring around the rotation axis of the double-chamber helical gear (1) and is arranged outside the shaft connection portion (2); the supporting body (42) supports the lower surface of the helical tooth portion (3); the first spoke plate (43), the second spoke plate (44) and the third spoke plate (45) are arranged in sequence along the rotation axis and the first spoke plate (43) is closest to the helical tooth portion (3); the first spoke plate (43), the second spoke plate (44) and the third spoke plate (45) are respectively connected to the inner ring body (41) and the supporting body (42); a first chamber (46) is formed between the first spoke plate (43) and the second spoke plate (44), and a second chamber (47) is formed between the second spoke plate (44) and the third spoke plate (45); The upper surface, lower surface and outer edge surface of the supporting body (42) respectively intersect with the cross section passing through the rotation axis to form a first straight line segment (L1), a second straight line segment (L2) and a third straight line segment (L3), the first straight line segment (L1) is located on the lower surface of the helical tooth portion (3), the second straight line segment (L2) is parallel to the first straight line segment (L1), and the third straight line segment (L3) is parallel to the rotation axis; The upper surface and lower surface of the first web (43) intersect with the cross section to form a fourth straight line segment (L4) and a fifth straight line segment (L5), respectively; the fourth straight line segment (L4) is connected to the upper end surface of the inner ring body (41) and is perpendicular to the rotation axis; the fifth straight line segment (L5) is parallel to the fourth straight line segment (L4); The upper surface of the second spoke (44) intersects with the cross section to form a first intersection line, and the first intersection line includes, from the inside to the outside, a sixth straight line segment (L6), a seventh straight line segment (L7), and an eighth straight line segment (L8); the lower surface of the second spoke (44) intersects with the cross section to form a second intersection line, and the second intersection line includes, from the inside to the outside, a ninth straight line segment (L9) parallel to the sixth straight line segment (L6) and a tenth straight line segment (L10) parallel to the seventh straight line segment (L7); the sixth straight line segment (L6) is connected to the middle of the outer edge surface of the inner ring body (41) and is perpendicular to the rotation axis; the seventh straight line segment (L7) is inclined outward and upward; and the eighth straight line segment (L8) is parallel to the rotation axis; The upper surface of the third spoke (45) intersects with the cross section to form a third intersection line, and the third intersection line includes, from inside to outside, an eleventh straight line segment (L11), a twelfth straight line segment (L12), and a thirteenth straight line segment (L13); the lower surface of the third spoke (45) intersects with the cross section to form a fourth intersection line, and the fourth intersection line includes, from inside to outside, a fourteenth straight line segment (L14) parallel to the eleventh straight line segment (L11), a fifteenth straight line segment (L15) parallel to the twelfth straight line segment (L12), and a sixteenth straight line segment (L16) parallel to the thirteenth straight line segment (L13); the fourteenth straight line segment (L14) is connected to the lower end of the inner edge surface of the inner ring body (41) and is inclined outward and downward; the fifteenth straight line segment (L15) is perpendicular to the rotation axis; the sixteenth straight line segment (L16) is inclined outward and upward and is connected to the lower end of the outer edge surface of the support body (42).

2. A double-chamber helical gear (1) according to claim 1, characterized in that: A plurality of through holes (431) are evenly distributed along the circumferential direction on the first spoke plate (43); the through holes (431) are elliptical, with their major axes extending radially.

3. A double-chamber helical gear (1) as claimed in claim 2, characterized in that: The number of the through holes (431) is 14.

4. A double-chamber helical gear (1) as claimed in claim 3, characterized in that: The first chamber (46) intersects with the cross section to form a fifth intersection line, and the fifth intersection line includes, in sequence, a fifth straight line segment (L5), an eighth straight line segment (L8), a seventh straight line segment (L7), a sixth straight line segment (L6), and a seventeenth straight line segment (L17) located on the outer edge surface of the inner ring body (41); the second chamber (47) intersects with the cross section to form a sixth intersection line, and the sixth intersection line includes, in sequence, a ninth straight line segment (L9), a tenth straight line segment (L10), a second straight line segment (L2), a thirteenth straight line segment (L13), a twelfth straight line segment (L12), an eleventh straight line segment (L11), and an eighteenth straight line segment (L18) located on the outer edge surface of the inner ring body (41).

5. A double-chamber helical gear (1) as claimed in claim 4, characterized in that: The double-chamber helical gear (1) is provided with a tangential component of meshing force on the gear teeth of less than or equal to 81,000 N, an axial component of meshing force on the gear teeth of less than or equal to 23,000 N, a radial component of meshing force on the gear teeth of less than or equal to 53,000 N, and a rotational speed of less than or equal to 323 rpm; if the total mass of the helical tooth portion (3) is less than or equal to 8 kg, the yield strength of the material used for the web portion (4) is greater than or equal to 900 MPa, and the material density is less than or equal to 7.86 g / cm 3 ,but When 1 and hour, The following parameters of the web portion (4) are: ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； in, is the radius of the inner edge surface of the inner ring body (41), in units of ; is the radius of the outer edge surface of the support body (42), in units of ; is the distance from the intersection of the fourteenth straight line segment (L14) and the fifteenth straight line segment (L15) to the rotation axis, in units of ; is the distance from the eighth straight line segment (L8) to the rotation axis, in units of ; is the distance from the intersection of the fifteenth straight line segment (L15) and the sixteenth straight line segment (L16) to the rotation axis, in units of ; is the distance from the center point of the through hole (431) to the rotation axis, in units of ; is the distance from the intersection of the first straight line segment (L1) and the fourth straight line segment (L4) to the rotation axis, in units of ; is the distance from the fourth straight line segment (L4) to the sixth straight line segment (L6), in units of ; is the distance from the fourth straight line segment (L4) to the fifteenth straight line segment (L15), in units of ; is the distance from the fourth straight line segment (L4) to the fifth straight line segment (L5), in units of ; is the distance from the first straight line segment (L1) to the second straight line segment (L2), in units of ; is the distance from the seventh straight line segment (L7) to the tenth straight line segment (L10), in units of ; is the distance from the sixth straight line segment (L6) to the ninth straight line segment (L9), in units of ; is the distance from the thirteenth straight line segment (L13) to the sixteenth straight line segment (L16), in units of ; is the distance from the twelfth straight line segment (L12) to the fifteenth straight line segment (L15), in units of ; is the distance from the eleventh straight line segment (L11) to the fourteenth straight line segment (L14), in units of ; is the thickness of the inner ring body (41), in units of ; is the angle between the eighth straight line segment (L8) and the seventh straight line segment (L7); is the angle between the thirteenth straight line segment (L13) and the twelfth straight line segment (L12); is the angle between the twelfth straight line segment (L12) and the eleventh straight line segment (L11); is the angle between the seventh straight line segment (L7) and the sixth straight line segment (L6); is the angle between the first straight line segment (L1) and the fourth straight line segment (L4); is the major axis of the through hole (431), in units of ; is the minor axis of the through hole (431), in units of .

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