A helical gear with double spokes

Abstract

The present application discloses a helical gear with double-layer spokes, wherein the spoke plate portion includes an inner ring, a lining plate, an outer ring, a plurality of first spokes, and a plurality of second spokes; the plurality of first spokes are uniformly distributed circumferentially around the rotation axis, one end of the first spoke is connected to the inner ring, and the other end is connected to the lower surface of the lining plate; the number of second spokes is equal to the number of first spokes and corresponds one to one; one end of the second spoke is connected to the inner ring, and the other end is connected to the outer ring; the extension direction of the first spoke and the second spoke are both inclined relative to the radial direction of the helical gear, and the inclination direction is consistent with the rotation direction of the helical teeth of the helical tooth portion; the first spoke and the corresponding second spoke are arranged along the extension direction of the rotation axis, and the second spoke is farther away from the helical tooth portion than the first spoke. With the above configuration, the helical gear with double-layer spokes can achieve lightweighting while meeting stress requirements.

Description

Technical Field

[0001] The present application relates to the field of helicopter transmission systems, and in particular to a helical gear with double-layer spokes. 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 application is to overcome the above-mentioned defects or problems in the background technology and to provide a helical gear with double-layer spokes, which has an innovative configuration and can achieve lightweight while meeting stress requirements.

[0004] In order to achieve the above purpose, the following technical solution is adopted.

[0005] A helical gear with double-layer spokes, comprising a helical tooth portion, a shaft connecting portion and a spoke plate portion connected to each other as one body, wherein the lower surface of the helical tooth portion facing away from the tooth top is a conical ring surface; the spoke plate portion comprises an inner ring, a lining plate, an outer ring, a plurality of first spokes and a plurality of second spokes; the inner ring is in a circular ring shape around the rotation axis of the helical gear and is arranged around the outside of the shaft connecting portion; the lining plate is attached to the lower surface of the helical tooth portion with equal thickness; the outer ring is in a circular ring shape around the rotation axis, and its outer edge surface is connected to the outer edge of the lower surface of the helical tooth portion; a plurality of first spokes are evenly distributed around the circumference of the rotation axis, and one end of the first spoke is connected to the inner ring near the helical tooth portion The first spoke and the second spoke are connected to the gear of the outer ring, and the other end is connected to the lower surface of the lining plate close to the inner ring; the number of the second spokes is equal to and corresponds to the number of the first spokes; one end of the second spoke is connected to the portion of the inner ring away from the helical tooth portion, and the other end is connected to the portion of the outer ring away from the helical tooth portion; the extension directions of the first spoke and the second spoke are inclined relative to the radial direction of the helical gear, and the inclination directions are consistent with the rotation direction of the helical teeth of the helical tooth portion; the first spoke and the corresponding second spoke are arranged along the extension direction of the rotation axis, and the second spoke is farther away from the helical tooth portion than the first spoke.

[0006] Furthermore, the first spoke includes a main body, a first transition portion and a second transition portion which are connected to each other as a whole; one end of the main body is connected to the outer edge surface of the inner ring, and the other end is connected to the lower surface of the lining; the first transition portion and the second transition portion are respectively rounded transitions formed between the two side surfaces of the main body and the lower surface of the lining.

[0007] Furthermore, two side surfaces of the main body are parallel to the extending direction of the first spoke and perpendicular to the projection plane.

[0008] Furthermore, the upper surface and the lower surface of the first spoke respectively form a first intersection line and a second intersection line with the first plane passing through the rotation axis, and the first intersection line includes a first straight line segment, a second straight line segment and a first arc segment from the inside to the outside, and the first straight line segment is connected to the upper end of the outer edge surface of the inner ring and tilted outward and downward; the second straight line segment is perpendicular to the rotation axis, and the first arc segment is connected to the lower end of the inner edge surface of the lining and bends outward and downward; there is an arc transition between the first straight line segment and the second straight line segment; the second intersection line includes a third straight line segment and a fourth straight line segment from the inside to the outside, the third straight line segment is parallel to the second straight line segment, and the fourth straight line segment is connected to the lower surface of the lining and tilted outward and upward.

[0009] Furthermore, the two side surfaces of the second spoke are parallel to the extension direction of the second spoke and perpendicular to the projection plane; the projection of the side surface of the body on the projection plane and the projection of the side surface corresponding to the second spoke on the projection plane are located on the same straight line.

[0010] Furthermore, the upper surface and lower surface of the second spoke form a third intersection line and a fourth intersection line with the first plane respectively, and the third intersection line includes a fifth straight line segment and a sixth straight line segment from the inside to the outside, the fifth straight line segment is perpendicular to the rotation axis, and the sixth straight line segment is inclined outward and upward and transitions with the rounded corner of the inner edge surface of the outer ring; the fourth intersection line includes a seventh straight line segment parallel to the fifth straight line segment and an eighth straight line segment parallel to the sixth straight line segment; the eighth straight line segment is connected to the lower end of the outer edge surface of the outer ring.

[0011] Furthermore, a gap is formed between the seventh straight line segment and the lower surface of the inner ring.

[0012] Furthermore, the plane where one of the side surfaces of the body is located is tangent to the inner edge surface of the inner ring; the angle between the plane where the other side surface of the body is located and the second plane is ; wherein the second plane is defined as a plane passing through the fifth intersection line and the rotation axis, and the fifth intersection line is the intersection line of the plane where the other side surface of the body is located and the inner edge surface of the inner ring.

[0013] Furthermore, the number of the first spokes is 6.

[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 / cm 3 , then when and When , the following parameters of the helical gear are: ; ; ; ; ; ; ; ; ; ; ; ;in, is the radius of the inner edge of the inner ring, in mm; is the radius of the outer edge of the outer ring, in mm; is the distance from the outer endpoint of the seventh straight line segment to the rotation axis, in mm; is the distance from the inner edge of the upper surface of the lining plate to the rotation axis, in mm; is the distance from the outer endpoint of the second straight line segment to the rotation axis, in mm; is the radius of the outer edge of the inner ring, in mm; is the distance from the seventh straight line segment to the plane where the upper end surface of the inner ring is located, in mm; is the thickness of the lining plate, in mm; is the thickness of the outer ring, in mm; is the distance from the seventh straight line segment to the plane where the lower end surface of the inner ring is located, in mm; is the distance from the second straight line segment to the third straight line segment, in mm; is the distance from the fifth straight line segment to the seventh straight line segment, in mm; is the distance from the sixth straight line segment to the eighth straight line segment, in mm; is the radius of the first arc segment, in mm; is the angle between the seventh straight line segment and the eighth straight line segment; is the angle between the first straight line segment and the upper end surface of the inner ring; is the angle between the third straight line segment and the fourth straight line segment.

[0015] Compared with the prior art, the above solution has the following beneficial effects:

[0016] The helical gear with double-layer spokes involved in the present application has a spoke plate portion mainly composed of a plurality of first spokes and a plurality of second spokes, with gaps formed between the first spokes and the second spokes. The extension directions of the first spokes and the second spokes are both inclined relative to the radial direction of the helical gear, and the inclination directions are consistent with the rotation direction of the helical teeth of the helical tooth portion. It is not only lighter in weight, but also meets the stress and deformation requirements. Compared with the spoke plate in the prior art, it achieves lightweighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment, the following briefly introduces the drawings required for use:

[0018] Figure 1 The three-dimensional helical gear with double spokes in the embodiment Figure 1 ;

[0019] Figure 2 The three-dimensional helical gear with double spokes in the embodiment Figure 2 ;

[0020] Figure 3 This is a front view of a helical gear with double spokes in an embodiment;

[0021] Figure 4 A rear view of a helical gear with double spokes in an embodiment;

[0022] Figure 5 for Figure 4 AA section view.

[0023] Description of main reference numerals:

[0024] Helical gear 1 with double spokes; shaft connecting portion 2; helical tooth portion 3; spoke plate portion 4; inner ring 41; lining plate 42; outer ring 43; first spoke 44; first transition portion 44a; second transition portion 44b; second spoke 45. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In the claims and the description, unless otherwise defined, the terms "include", "have" and their variations mean "including but not limited to".

[0029] The technical solutions in the embodiments will be described clearly and completely below with reference to the accompanying drawings.

[0030] See also Figures 1 to 2 , Figures 1 to 2 The embodiment shows a helical gear 1 with double spokes. As shown in the figure, the helical gear 1 with double spokes comprises a helical tooth portion 3, a shaft connecting portion 2 and a spoke plate portion 4 connected to each other as one body. The lower surface of the helical tooth portion 3 facing away from the tooth top is a conical ring surface.

[0031] The spoke portion 4 includes an inner ring 41 , a lining plate 42 , an outer ring 43 , a plurality of first spokes 44 and a plurality of second spokes 45 .

[0032] The inner ring 41 is in the shape of a ring surrounding the rotation axis of the helical gear 1 and is disposed outside the shaft connection portion 2 .

[0033] The lining plate 42 is attached to the lower surface of the helical tooth portion 3 with uniform thickness.

[0034] The outer ring 43 is in the shape of a ring around the rotation axis, and its outer edge surface is in contact with the outer edge of the lower surface of the helical tooth portion 3.

[0035] like Figure 3As shown, a number of first spokes 44 are evenly distributed around the circumference of the rotation axis. In this embodiment, the number of first spokes 44 is 6. One end of the first spoke 44 is connected to the part of the inner ring 41 close to the helical tooth portion 3, and the other end is connected to the part of the lower surface of the lining plate 42 close to the inner ring 41. The extension direction of the first spoke 44 is inclined relative to the radial direction of the helical gear 1, and the inclination direction is consistent with the rotation direction of the helical teeth of the helical tooth portion 3. The first spoke 44 includes a main body, a first transition portion 44a and a second transition portion 44b that are connected to each other as a whole; one end of the main body is connected to the outer edge surface of the inner ring 41, and the other end is connected to the lower surface of the lining plate 42, and the two side surfaces of the main body are parallel to the extension direction of the first spoke 44 and perpendicular to the projection surface. As shown Figure 4 As shown, the plane where one of the side surfaces of the body is located is tangent to the inner edge of the inner ring 41 (∠ ); The angle between the plane where the other side surface of the body is located and the second plane is (∠ ); wherein the second plane is defined as the plane passing through the fifth intersection line and the rotation axis, and the fifth intersection line is the intersection line of the plane where the other side surface of the body is located and the inner edge surface of the inner ring 41. Figure 2 and Figure 4 As shown, the first transition portion 44a and the second transition portion 44b are respectively formed as rounded transitions between the two side surfaces of the body and the lower surface of the lining plate 42. Figure 5 As shown, the upper surface and the lower surface of the first spoke 44 form a first intersection line and a second intersection line with the first plane passing through the rotation axis respectively. The first intersection line includes a first straight line segment, a second straight line segment and a first arc segment from the inside to the outside. The first straight line segment is connected to the upper end of the outer edge surface of the inner ring 41 and is inclined outward and downward; the second straight line segment is perpendicular to the rotation axis, and the first arc segment is connected to the lower end of the inner edge surface of the lining plate 42 and is bent outward and downward; there is an arc transition between the first straight line segment and the second straight line segment; the second intersection line includes a third straight line segment and a fourth straight line segment from the inside to the outside. The third straight line segment is parallel to the second straight line segment, and the fourth straight line segment is connected to the lower surface of the lining plate 42 and is inclined outward and upward.

[0036] like Figure 4 As shown, the number of the second spokes 45 is equal to the number of the first spokes 44 and corresponds one to one; one end of the second spoke 45 is connected to the portion of the inner ring 41 away from the bevel tooth portion 3, and the other end is connected to the portion of the outer ring 43 away from the bevel tooth portion 3; the extension direction of the second spoke 45 is the same as the extension direction of the corresponding first spoke 44; the first spoke 44 and the corresponding second spoke 45 are arranged along the extension direction of the rotation axis, and the second spoke 45 is farther away from the bevel tooth portion 3 than the first spoke 44. The two side surfaces of the second spoke 45 are parallel to the extension direction of the second spoke 45 and perpendicular to the projection plane; the projection of the side surface of the body on the projection plane and the projection of the side surface corresponding to the second spoke 45 on the projection plane are located on the same straight line. As shown Figure 5As shown, the upper and lower surfaces of the second spoke 45 form third and fourth intersections with the first plane, respectively. The third intersection includes, from the inside out, a fifth straight line segment and a sixth straight line segment. The fifth straight line segment is perpendicular to the axis of rotation, while the sixth straight line segment is inclined outward and upward, transitioning to the rounded corner of the inner edge of the outer ring 43. The fourth intersection includes a seventh straight line segment parallel to the fifth straight line segment and an eighth straight line segment parallel to the sixth straight line segment. The seventh straight line segment is spaced apart from the lower surface of the inner ring 41. The eighth straight line segment connects to the lower end of the outer edge of the outer ring 43.

[0037] In this embodiment, when the tangential component of the meshing force on the helical gear 1 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 and When , the following parameters of the helical gear 1 are: ; ; ; ; ; ; ; ; ; ; ; ;in, is the radius of the inner edge surface of the inner ring 41, in mm; is the radius of the outer edge surface of the outer ring 43, in mm; is the distance from the outer endpoint of the seventh straight line segment to the rotation axis, in mm; is the distance from the inner edge of the upper surface of the lining plate 42 to the rotation axis, in mm; is the distance from the outer endpoint of the second straight line segment to the rotation axis, in mm; is the radius of the outer edge surface of the inner ring 41, in mm; is the distance from the seventh straight line segment to the plane where the upper end surface of the inner ring 41 is located, in mm; is the thickness of the lining plate 42, in mm; is the thickness of the outer ring 43, in mm; is the distance from the seventh straight line segment to the plane where the lower end surface of the inner ring 41 is located, in mm; is the distance from the second straight line segment to the third straight line segment, in mm; is the distance from the fifth straight line segment to the seventh straight line segment, in mm; is the distance from the sixth straight line segment to the eighth straight line segment, in mm; is the radius of the first arc segment, in mm; is the angle between the seventh straight line segment and the eighth straight line segment; is the angle between the first straight line segment and the upper end surface of the inner ring 41; is the angle between the third straight line segment and the fourth straight line segment.

[0038] Specifically, in this embodiment, , The helical gear 1 with double spokes 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.

[0039] For the helical gear 1 used in the same environment, if the web portion 4 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 spoke plate portion 4 of the helical gear 1 with double spokes in this embodiment is 2.756*10 6 mm 3 , with a mass of 21.663kg. Compared with the known spoke plate, it has a smaller volume and lighter mass, and its mass can be reduced by 82.901%, achieving a good lightweight effect.

[0040] A static analysis of the double-spoke helical gear 1 was conducted using a 2mm mesh size and 140,342 cells. The equivalent stress (von-Mises stress) on the spoke plate 4 ranged from 653.51 MPa to 778.35 MPa, significantly lower than the material's yield strength. Therefore, reliable operation is guaranteed.

[0041] 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 helical gear (1) with double spokes, comprising a helical tooth portion (3), a shaft connecting portion (2), and a spoke plate 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) includes an inner ring (41), a lining plate (42), an outer ring (43), a plurality of first spokes (44) and a plurality of second spokes (45); the inner ring (41) is in a circular ring shape around the rotation axis of the helical gear (1) and is arranged outside the shaft connection portion (2); the lining plate (42) is attached to the lower surface of the helical tooth portion (3) with equal thickness; the outer ring (43) is in a circular ring shape around the rotation axis, and its outer edge surface is connected to the outer edge of the lower surface of the helical tooth portion (3); a plurality of first spokes (44) are uniformly distributed around the circumference of the rotation axis, one end of the first spoke (44) is connected to the portion of the inner ring (41) close to the helical tooth portion (3), and the other end is connected to the lower surface of the lining plate (42) close to the inner ring. (41); the number of the second spokes (45) is equal to and corresponds to the number of the first spokes (44); one end of the second spoke (45) is connected to the portion of the inner ring (41) away from the helical tooth portion (3), and the other end thereof is connected to the portion of the outer ring (43) away from the helical tooth portion (3); the extension directions of the first spokes (44) and the second spokes (45) are both inclined relative to the radial direction of the helical gear (1), and the inclination directions are both consistent with the helical tooth rotation direction of the helical tooth portion (3); the first spokes (44) and the corresponding second spokes (45) are arranged along the extension direction of the rotation axis, and the second spokes (45) are further away from the helical tooth portion (3) than the first spokes (44); The upper surface and the lower surface of the first spoke (44) respectively form a first intersection line and a second intersection line with the first plane passing through the rotation axis, the first intersection line includes a first straight line segment, a second straight line segment and a first arc segment from the inside to the outside, the first straight line segment is connected to the upper end of the outer edge surface of the inner ring (41) and is inclined outward and downward; the second straight line segment is perpendicular to the rotation axis, the first arc segment is connected to the lower end of the inner edge surface of the lining plate (42) and is bent outward and downward; the first straight line segment and the second straight line segment are connected to each other in an arc transition; the second intersection line includes a third straight line segment and a fourth straight line segment from the inside to the outside, the third straight line segment is parallel to the second straight line segment, and the fourth straight line segment is connected to the lower surface of the lining plate (42) and is inclined outward and upward; The upper surface and the lower surface of the second spoke (45) respectively form a third intersection line and a fourth intersection line with the first plane, the third intersection line includes a fifth straight line segment and a sixth straight line segment from the inside to the outside, the fifth straight line segment is perpendicular to the rotation axis, the sixth straight line segment is inclined outward and upward and transitions with the rounded corner of the inner edge surface of the outer ring (43); the fourth intersection line includes a seventh straight line segment parallel to the fifth straight line segment and an eighth straight line segment parallel to the sixth straight line segment; the eighth straight line segment is connected to the lower end of the outer edge surface of the outer ring (43).

2. A helical gear (1) with double spokes according to claim 1, characterized in that: The first spoke (44) includes a body, a first transition portion (44a) and a second transition portion (44b) which are connected to each other as a whole; one end of the body is connected to the outer edge surface of the inner ring (41), and the other end is connected to the lower surface of the lining plate (42); the first transition portion (44a) and the second transition portion (44b) are respectively rounded transitions formed between the two side surfaces of the body and the lower surface of the lining plate (42).

3. A helical gear (1) with double spokes as claimed in claim 2, characterized in that: The two side surfaces of the body are parallel to the extension direction of the first spoke (44) and perpendicular to the projection plane.

4. A helical gear (1) with double spokes as claimed in claim 3, characterized in that: The two side surfaces of the second spoke (45) are parallel to the extension direction of the second spoke (45) and perpendicular to the projection plane; the projection of the side surface of the body on the projection plane and the projection of the side surface corresponding to the second spoke (45) on the projection plane are located on the same straight line.

5. A helical gear (1) with double spokes as claimed in claim 4, characterized in that: A gap is formed between the seventh straight line segment and the lower surface of the inner ring (41).

6. A helical gear (1) with double spokes as claimed in claim 5, characterized in that: The plane where one of the side surfaces of the body is located is tangent to the inner edge surface of the inner ring (41); the angle between the plane where the other side surface of the body is located and the second plane is ; wherein the second plane is defined as a plane passing through the fifth intersection line and the rotation axis, and the fifth intersection line is the intersection line of the plane where the other side surface of the body is located and the inner edge surface of the inner ring (41).

7. A helical gear (1) with double spokes as claimed in claim 6, characterized in that: The number of the first spokes (44) is 6.

8. A helical gear (1) with double spokes as claimed in claim 7, characterized in that: When the tangential component of the meshing force on the gear teeth of the helical gear (1) 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 (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 ,but when and hour, The following parameters of the helical gear (1) are: ； ； ； ； ； ； ； ； ； ； ； ； in, is the radius of the inner edge surface of the inner ring (41), in mm; is the radius of the outer edge surface of the outer ring (43), in mm; is the distance from the outer endpoint of the seventh straight line segment to the rotation axis, in mm; is the distance from the inner edge of the upper surface of the lining plate (42) to the rotation axis, in mm; is the distance from the outer endpoint of the second straight line segment to the rotation axis, in mm; is the radius of the outer edge surface of the inner ring (41), in mm; is the distance from the seventh straight line segment to the plane where the upper end surface of the inner ring (41) is located, in mm; is the thickness of the lining plate (42), in mm; is the thickness of the outer ring (43), in mm; is the distance from the seventh straight line segment to the plane where the lower end surface of the inner ring (41) is located, in mm; is the distance from the second straight line segment to the third straight line segment, in mm; is the distance from the fifth straight line segment to the seventh straight line segment, in mm; is the distance from the sixth straight line segment to the eighth straight line segment, in mm; is the radius of the first arc segment, in mm; is the angle between the seventh straight line segment and the eighth straight line segment; is the angle between the first straight line segment and the upper end surface of the inner ring (41); is the angle between the third straight line segment and the fourth straight line segment.

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