A three-layer spoke helical gear

Abstract

The present invention discloses a three-layer spoke plate helical gear, wherein the spoke plate portion of the helical gear comprises an inner ring body, a supporting body, and a first spoke plate, a second spoke plate, and a third spoke plate arranged in sequence from top to bottom along the axial direction, wherein the inner edges of the first spoke plate, the second spoke plate, and the third spoke plate are respectively connected to the inner ring body, the outer edge of the first spoke plate is connected to the supporting portion, the outer edge of the third spoke plate is connected to the outer ring portion, the second spoke plate extends obliquely relative to the rotation axis, and its outer edge is connected to the surface of the third spoke plate facing the first spoke plate; the three-layer spoke plate helical gear is not only lighter in weight, but also has a structure that meets the stress and deformation requirements, thereby achieving lightweighting while ensuring that the stress requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of gear transmission, and in particular to a three-layer spoke plate 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 three-layer spoke plate helical gear, which has an innovative configuration and can achieve lightweight while meeting stress requirements.

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

[0005] The gear train of claim 1, wherein the gear train is constructed with opposite ends to form a circle, and the two ends of the gear train are connected along a vertical cam path to the other ends of the gear train. The two ends of the gear train are connected along a horizontal cam path to the other ends of the gear train. The two ends of the gear train are connected along a horizontal cam path to the other ends of the gear train.

[0006] Furthermore, the first spoke plate has a plurality of first through holes evenly distributed along the circumference; the second spoke plate has a plurality of second through holes evenly distributed along the circumference, and the number and positions of the second through holes correspond one-to-one to those of the first through holes;

[0007] The third web is uniformly distributed with a plurality of third through holes along the circumferential direction, and each of the third through holes spans three adjacent second through holes in the circumferential direction.

[0008] Furthermore, the projections of the first through hole, the second through hole and the third through hole on the projection plane perpendicular to the rotation axis are all line-symmetrical shapes, and the symmetry lines of the three are all perpendicular to the rotation axis.

[0009] Furthermore, the symmetry line corresponding to each of the third through holes coincides with the symmetry line corresponding to the second through hole located in the middle position among the three adjacent second through holes spanned by the third through hole in the circumferential direction.

[0010] Furthermore, the first spoke plate includes a first inner ring portion in a circular shape around the rotation axis; the inner edge of the first inner ring portion is connected to the inner ring body, and the first through holes are evenly distributed along the circumferential direction between its outer edge and the supporting portion; the first through hole is formed by the first curved segment, the second curved segment, the third curved segment, the fourth curved segment, the fifth curved segment, the sixth curved segment, the seventh curved segment and the eighth curved segment connected end to end on the projection surface; the first curved segment and the fifth curved segment are distributed radially, and the two are respectively formed by the outer edge of the first inner ring portion and the inner edge of the supporting portion; the third curved segment and the seventh curved segment are distributed circumferentially, and the two are arc segments that are bent toward the inside of the first through hole and have the same curvature; the second curved segment, the fourth curved segment, the sixth curved segment and the eighth curved segment are arc segments that are bent toward the inside of the first through hole and have the same curvature.

[0011] Furthermore, the second spoke plate includes a second inner ring portion in a circular shape around the rotation axis; the inner edge of the second inner ring portion is connected to the inner ring body, and the second through holes are evenly distributed circumferentially between the outer edge thereof and the third spoke plate, and the shapes of the second inner ring portion and the second inner ring portion on the projection surface coincide with each other; the third spoke plate includes an outer ring portion in a circular shape around the rotation axis; the outer edge of the outer ring portion is connected to the circumference, and the third through holes are evenly distributed circumferentially between the inner edge thereof and the inner ring body; the second through holes are arranged on the projection surface by a ninth curved segment, a tenth curved segment, an eleventh curved segment, and a first intersecting curved segment. The ninth curved segment and the first intersection line are distributed radially, and the first intersection line is the intersection line formed by the tangency of the second through hole and the outer ring portion, and the ninth curved segment is formed by the outer edge of the second inner ring portion; the eleventh curved segment and the twelfth curved segment are distributed circumferentially, and both are arc segments that are bent toward the inside of the second through hole and have the same curvature, and both coincide with the third curved segment and the seventh curved segment on the projection surface; the tenth curved segment and the thirteenth curved segment are arc segments that are bent toward the inside of the second through hole and have the same curvature.

[0012] Furthermore, the third through hole is formed on the projection surface by the fourteenth curved segment, the fifteenth curved segment, the first straight segment, the sixteenth curved segment, the seventeenth curved segment, the eighteenth curved segment, the second straight segment and the nineteenth curved segment connected end to end; the fourteenth curved segment and the seventeenth curved segment are distributed radially, and are respectively formed by the outer surface of the inner ring body and the inner edge of the outer ring portion; the first straight segment and the second straight segment are distributed circumferentially, and the intersection of their extended lines is located at the rotation axis; the fifteenth curved segment, the sixteenth curved segment, the eighteenth curved segment and the nineteenth curved segment are arc segments that are bent toward the inside of the third through hole and have the same curvature.

[0013] Furthermore, the upper surface and the lower surface of the supporting portion intersect with the vertical section passing through the rotation axis to form a third straight line segment and a fourth straight line segment respectively; the outer edge surface and the inner edge surface of the peripheral portion intersect with the vertical section to form a fifth straight line segment and a sixth straight line segment respectively; the third straight line segment is parallel to the fourth straight line segment, and both are inclined to the rotation axis; the fifth straight line segment is parallel to the sixth straight line segment, and both are parallel to the rotation axis.

[0014] Furthermore, the upper surface and lower surface of the first spoke intersect with the vertical section to form a seventh straight line segment and an eighth straight line segment, respectively; the seventh straight line segment and the eighth straight line segment are parallel, and both are perpendicular to the rotation axis; the upper surface and the lower surface of the second spoke intersect with the vertical section to form a ninth straight line segment and a tenth straight line segment, respectively; the ninth straight line segment and the tenth straight line segment are parallel, and both are inclined to the rotation axis; the upper surface and the lower surface of the third spoke intersect with the vertical section to form a second intersection line and a third intersection line, respectively, and the second intersection line includes, from the inside to the outside, the eleventh straight line segment and the tenth straight line segment, respectively. The twelfth straight line segment, the third intersection line includes the thirteenth straight line segment and the fourteenth straight line segment from the inside to the outside; the eleventh straight line segment and the thirteenth straight line segment are parallel, both are inclined to the rotation axis and the inclination angle is smaller than the inclination angle of the ninth straight line segment or the tenth straight line segment relative to the rotation axis; the twelfth straight line segment and the fourteenth 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 the fifteenth straight line segment and the sixteenth straight line segment, the fifteenth straight line segment and the sixteenth straight line segment are parallel, and both are parallel to the rotation axis.

[0015] 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 inner edge of the inner ring, in units of ; The radius of the outer edge of the support body, i.e., the outer edge of the peripheral portion, is ; The inner edge of the support body, i.e. the radius of the inner edge formed by the upper surface of the support portion, is expressed in units of ;

[0016] is the radius of the outer edge of the first inner ring portion or the second inner ring portion, in units of ; is the radius of the circle on which the third, seventh, eleventh or twelfth curve segment lies on the projection surface, in units of ; is the radius of the inner edge of the outer ring, in units of ; is the distance from the intersection of the thirteenth straight line segment and the fourteenth straight line segment to the rotation axis, in units of ; is the radius of the circle on which the second, fourth, sixth and eighth curve segments lie on the projection surface, in units of ; is the radius of the circle on which the tenth, thirteenth, fifteenth, sixteenth, eighteenth and nineteenth curve segments lie on the projection surface, in units of ; is the distance between the intersection of the seventh and sixteenth straight line segments and the intersection of the fourteenth and sixteenth straight line segments, 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 fifteenth straight line segment to the sixteenth 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 fifth straight line segment to the sixth straight line segment, in units of ; is the distance from the twelfth straight line segment to the fourteenth straight line segment, in units of ; is the distance from the eleventh straight line segment to the thirteenth straight line segment, in units of ; is the distance from the ninth straight line segment to the tenth straight line segment, in units of ; is the central angle formed by the intersection of the circle where the third curved segment and the seventh curved segment respectively lie and the outer edge of the first inner ring portion relative to the rotation axis; The central angle formed by the intersection of the circle where the third curved segment and the seventh curved segment respectively lie on the projection surface and the outer edge surface of the outer peripheral portion relative to the rotation axis; is the angle between the third straight line segment and the seventh straight line segment; is the angle between the thirteenth straight line segment and the fourteenth straight line segment; It is the central angle formed by the intersection of the extended lines of the first straight line segment and the second straight line segment at the rotation axis.

[0017] 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:

[0018] The three-layer spoke plate helical gear provided by the present invention has a spoke plate portion including three layers of spoke plates connected to the inner ring body and the supporting body and arranged from top to bottom, wherein the second spoke plate is arranged at an angle, so that the helical gear is 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 plates in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of a three-layer spoke helical gear provided by the present invention Figure 1 ;

[0021] Figure 2 A schematic diagram of the structure of an embodiment of a three-layer spoke helical gear provided by the present invention Figure 2 ;

[0022] Figure 3 for Figure 1 A schematic top view of the spoke portion of a three-layer spoke helical gear;

[0023] Figure 4 for Figure 3 Schematic diagram of the middle AA section;

[0024] Figure 5 for Figure 1 A schematic side view of the spoke portion of a three-layer spoke helical gear;

[0025] Figure 6 for Figure 5 Schematic diagram of the middle BB section;

[0026] Figure 7 for Figure 1 A bottom view of the spoke portion of a three-layer spoke helical gear;

[0027] Figure 8 for Figure 1 Schematic diagram of the calculation results of the front equivalent stress of the spoke part of the three-layer spoke helical gear;

[0028] Figure 9 for Figure 1 Schematic diagram of the calculation results of the equivalent stress on the back side of the spoke part of the three-layer spoke helical gear.

[0029] Description of main reference numerals:

[0030] Shaft connecting portion 10; web portion 20; first web 21; first inner ring portion 211; first through hole 212; second web 22; second inner ring portion 221; second through hole 222; third web 23; outer ring portion 231; third through hole 232; inner ring body 24; supporting body 25; supporting portion 251; outer peripheral portion 252; opening 253; helical tooth portion 30;

[0031] a first curved segment 401; a second curved segment 402; a third curved segment 403; a fourth curved segment 404; a fifth curved segment 405; a sixth curved segment 406; a seventh curved segment 407; an eighth curved segment 408; a ninth curved segment 409; a tenth curved segment 4010; an eleventh curved segment 4011; a twelfth curved segment 4012; and a thirteenth curved segment 4013.

[0032] First straight line segment 501; second straight line segment 502; third straight line segment 503; fourth straight line segment 504; fifth straight line segment 505; sixth straight line segment 506; seventh straight line segment 507; eighth straight line segment 508; ninth straight line segment 509; tenth straight line segment 5010; eleventh straight line segment 5011; twelfth straight line segment 5012; thirteenth straight line segment 5013; fourteenth straight line segment 5014; fifteenth straight line segment 5015; sixteenth straight line segment 5016; first intersection line 601. 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 7An embodiment of the present invention provides a three-layer spoke plate helical gear, which includes a shaft connecting portion 10, a spoke plate 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 portion 20 includes an inner ring body 24, a supporting body 25, a first spoke 21, a second spoke 22 and a third spoke 23; the inner ring body 24 is annular around the rotation axis of the helical gear and is arranged around the outside of the shaft connection portion 10; the supporting body 25 has a supporting portion 251 for supporting the lower surface of the helical tooth portion 30 and is annular around the rotation axis, and has an outer peripheral portion 252 extending from the outer edge of the supporting portion 251 away from the helical tooth portion 30 along the rotation axis; the first spoke 21, the second spoke 22 and the third spoke 23 are arranged in sequence from top to bottom along the rotation axis; the inner edges of the first spoke 21, the second spoke 22 and the third spoke 23 are respectively connected to the inner ring body 24, the outer edge of the first spoke 21 is connected to the supporting portion 251, the outer edge of the third spoke 23 is connected to the outer ring portion 231, and the second spoke 22 extends obliquely relative to the rotation axis and its outer edge is connected to the surface of the third spoke 23 facing the first spoke 21.

[0041] Here, we explain the directional pronouns used in the present specification and claims. In this helical gear, the vertical direction is defined as the direction extending along the helical gear's axis of rotation. The first spoke 21 is located on the upper side of the helical gear, and the third spoke 23 is located on the lower side. Since the helical gear is a rotating body, its axis of rotation is also defined as having radial and circumferential directions. The radial direction refers to the direction perpendicular to the axis of rotation, and the circumferential direction refers to the direction surrounding the axis of rotation. Therefore, the vertical cross-section referred to in the present specification and claims refers to a plane extending vertically through the helical gear's axis of rotation, while the cross-section refers to a plane extending perpendicular to the helical gear's axis of rotation.

[0042] In addition, the present invention specification and claims also define a projection plane, which is perpendicular to the rotation axis of the helical gear. In the corresponding drawings of the specification, the top view, bottom view and cross-sectional view of the helical gear can all be regarded as the shape of the corresponding part projected onto the projection plane.

[0043] Reference Figures 3 to 7The first spoke 21 has a plurality of first through-holes 212 evenly distributed along the circumference; the second spoke 22 has a plurality of second through-holes 222 evenly distributed along the circumference, with the number and position of the second through-holes 222 corresponding one-to-one with the first through-holes 212; the third spoke 23 has a plurality of third through-holes 232 evenly distributed along the circumference, with each third through-hole 232 circumferentially spanning three adjacent second through-holes 222. The projections of the first through-holes 212, the second through-holes 222, and the third through-holes 232 on a projection plane perpendicular to the rotation axis are all linearly symmetrical, with their lines of symmetry perpendicular to the rotation axis. The line of symmetry corresponding to each third through-hole 232 coincides with the line of symmetry corresponding to the middle second through-hole 222 of the three adjacent second through-holes 222 spanned by the third through-hole 232 circumferentially.

[0044] In this embodiment, the number of the first through holes 212 and the second through holes 222 is set to 14, and the number of the third through holes 232 is set to 7.

[0045] The first spoke 21 includes a first inner ring portion 211 in a circular shape around the rotation axis; the inner edge of the first inner ring portion 211 is connected to the inner ring body 24, and first through holes 212 are uniformly distributed along the circumferential direction between the outer edge and the supporting portion 251; the first through holes 212 are surrounded by the first curved segment 401, the second curved segment 402, the third curved segment 403, the fourth curved segment 404, the fifth curved segment 405, the sixth curved segment 406, the seventh curved segment 407 and the eighth curved segment 408 on the projection surface. The first curved segment 401 and the fifth curved segment 405 are distributed in the radial direction, and are respectively formed by the outer edge of the first inner ring portion 211 and the inner edge of the supporting portion 251; the third curved segment 403 and the seventh curved segment 407 are distributed in the circumferential direction, and are both arc segments that bend toward the inside of the first through hole 212 and have the same curvature; the second curved segment 402, the fourth curved segment 404, the sixth curved segment 406 and the eighth curved segment 408 are arc segments that bend toward the inside of the first through hole 212 and have the same curvature.

[0046] The second spoke 22 includes a second inner ring portion 221 in a circular shape around the rotation axis; the inner edge of the second inner ring portion 221 is connected to the inner ring body 24, and second through holes 222 are uniformly distributed along the circumferential direction between its outer edge and the third spoke 23, and the shapes of the second inner ring portion 221 and the second inner ring portion 221 on the projection surface coincide with each other; the third spoke 23 includes an outer ring portion 231 in a circular shape around the rotation axis; the outer edge of the outer ring portion 231 is connected to the outer peripheral portion 252, and third through holes 232 are uniformly distributed along the circumferential direction between its inner edge and the inner ring body 24; the second through holes 222 are formed on the projection surface by the ninth curved segment 409, the tenth curved segment 4010, the eleventh curved segment 4011, the first intersection line 601, the twelfth curved segment 4012 and the thirteenth curved segment 4013 are connected end to end to form a surrounding; the ninth curved segment 409 and the first intersection line 601 are distributed radially, and the first intersection line 601 is the intersection line formed by the tangency of the second through hole 222 and the outer ring portion 231, and the ninth curved segment 409 is formed by the outer edge of the second inner ring portion 221; the eleventh curved segment 4011 and the twelfth curved segment 4012 are distributed circumferentially, and both are arc segments that bend toward the inside of the second through hole 222 and have the same curvature, and both coincide with the third curved segment 403 and the seventh curved segment 407 on the projection surface; the tenth curved segment 4010 and the thirteenth curved segment 4013 are arc segments that bend toward the inside of the second through hole 222 and have the same curvature.

[0047] The third through hole 232 is formed on the projection surface by the fourteenth curved segment, the fifteenth curved segment, the first straight segment 501, the sixteenth curved segment, the seventeenth curved segment, the eighteenth curved segment, the second straight segment 502 and the nineteenth curved segment connected end to end; the fourteenth curved segment and the seventeenth curved segment are distributed radially, and the two are respectively formed by the outer surface of the inner ring body 24 and the inner edge of the outer ring portion 231; the first straight segment 501 and the second straight segment 502 are distributed circumferentially, and the intersection of their extended lines is located at the axis of rotation; the fifteenth curved segment, the sixteenth curved segment, the eighteenth curved segment and the nineteenth curved segment are arc segments that are curved toward the inside of the third through hole 232 and have the same curvature.

[0048] The upper surface and the lower surface of the supporting portion 251 intersect with the vertical section passing through the rotation axis to form a third straight line segment 503 and a fourth straight line segment 504 respectively; the outer edge surface and the inner edge surface of the peripheral portion 252 intersect with the vertical section to form a fifth straight line segment 505 and a sixth straight line segment 506 respectively; the third straight line segment 503 is parallel to the fourth straight line segment 504, and both are inclined to the rotation axis; the fifth straight line segment 505 is parallel to the sixth straight line segment 506, and both are parallel to the rotation axis. The upper surface and lower surface of the first spoke 21 intersect with the vertical section to form a seventh straight line segment 507 and an eighth straight line segment 508, respectively. The seventh straight line segment 507 and the eighth straight line segment 508 are parallel and both are perpendicular to the rotation axis. The upper surface and lower surface of the second spoke 22 intersect with the vertical section to form a ninth straight line segment 509 and a tenth straight line segment 5010, respectively. The ninth straight line segment 509 and the tenth straight line segment 5010 are parallel and both are inclined to the rotation axis. The upper surface and lower surface of the third spoke 23 intersect with the vertical section to form a second intersection line and a third intersection line, respectively. The second intersection line includes, from the inside to the outside, the eleventh straight line segment 5011 and the twelfth straight line segment 5012. The third intersection line includes the thirteenth straight line segment 5013 and the fourteenth straight line segment 5014 from the inside to the outside; the eleventh straight line segment 5011 and the thirteenth straight line segment 5013 are parallel, both of which are inclined to the rotation axis and the inclination angle is smaller than the inclination angle of the ninth straight line segment 509 or the tenth straight line segment 5010 relative to the rotation axis; the twelfth straight line segment 5012 and the fourteenth straight line segment 5014 are parallel, and both of them are perpendicular to the rotation axis; the outer edge surface and the inner edge surface of the inner ring body 24 intersect with the vertical section respectively to form the fifteenth straight line segment 5015 and the sixteenth straight line segment 5016, the fifteenth straight line segment 5015 and the sixteenth straight line segment 5016 are parallel, and both of them are parallel to the rotation axis.

[0049] 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 / cm3, then and When , the following parameters of the web portion 20 are: ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;in, is the radius of the inner edge of the inner ring 24, in units of ; The radius of the outer edge of the support body 25, i.e., the outer edge of the peripheral portion 252, is expressed in units of ; The inner edge of the supporting body 25, i.e. the radius of the inner edge formed by the upper surface of the supporting portion 251, is expressed in units of ; is the radius of the outer edge of the first inner ring portion 211 or the second inner ring portion 221, in units of ; is the radius of the circle on which the third curve segment 403, the seventh curve segment 407, the eleventh curve segment 4011 or the twelfth curve segment 4012 lies on the projection surface, in units of ; is the radius of the inner edge of the outer ring portion 231, in units of ; is the distance from the intersection of the thirteenth straight line segment 5013 and the fourteenth straight line segment 5014 to the rotation axis, in units of ; is the radius of the circle on which the second curve segment 402, the fourth curve segment 404, the sixth curve segment 406 and the eighth curve are projected on the surface, in units of ; is the radius of the circle on which the tenth curve segment 4010, the thirteenth curve segment 4013, the fifteenth curve segment, the sixteenth curve segment, the eighteenth curve segment and the nineteenth curve segment lie on the projection surface, in units of ; The distance between the intersection of the seventh straight line segment 507 and the sixteenth straight line segment 5016 and the intersection of the fourteenth straight line segment 5014 and the sixteenth straight line segment 5016, in units of ; is the distance from the seventh straight line segment 507 to the eighth straight line segment 508, in units of ; is the distance from the fifteenth straight line segment 5015 to the sixteenth straight line segment 5016, in units of ; is the distance from the third straight line segment 503 to the fourth straight line segment 504, in units of ; is the distance from the fifth straight line segment 505 to the sixth straight line segment 506, in units of ; is the distance from the twelfth straight line segment 5012 to the fourteenth straight line segment 5014, in units of ; is the distance from the eleventh straight line segment 5011 to the thirteenth straight line segment 5013, in units of ; is the distance from the ninth straight line segment 509 to the tenth straight line segment 5010, in units of ; is the central angle formed by the intersection of the circle where the third curved segment 403 and the seventh curved segment 407 are located and the outer edge of the first inner ring portion 211 relative to the rotation axis; is the central angle formed by the intersection of the circle where the third curved segment 403 and the seventh curved segment 407 are located on the projection plane and the outer edge surface of the outer peripheral portion 252 relative to the rotation axis; is the angle between the third straight line segment 503 and the seventh straight line segment 507; is the angle between the thirteenth straight line segment 5013 and the fourteenth straight line segment 5014; It is the central angle formed by the intersection of the extension lines of the first straight line segment 501 and the second straight line segment 502 at the rotation axis.

[0050] 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: , , , , ,

[0051] , .

[0052] Specifically, refer to the markings in the accompanying drawings of the present invention. Figures 3 to 7 , A and B are the intersection points between the circles where the third curved segment 403 and the seventh curved segment 407 are located and the outer edge of the first inner ring portion 211, and the angle AOB is the above C, D are the intersections of the circles where the third curved segment 403 and the seventh curved segment 407 are located on the projection surface and the outer edge surface of the outer peripheral portion 252, and the angle COD is the above ; Line segment OH is the above ; Line segment OG is the above ; Line segment OE is the above ; Line segments OF and OK are the above ; The radius of the circle indicated by O' is the circle where the seventh curved segment 407 in the first through hole 212 is located; the line segment OJ is the above ; Line segment OI is the above .

[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 2094256. The cloud diagram of the calculated equivalent stress (von-Mises stress) is shown in FIG. Figure 8 and Figure 9 As shown. The calculation results show that under different operating conditions, the maximum von-Mises stress at the helical gear spokes ranges from 475.40 MPa to 524.83 MPa. A comparative example was designed to compare this embodiment with the present embodiment, differing in that the first and second spokes 21 and 22 are solid structures. Calculations show that the helical gear spoke volume of this comparative example is 17.1836 × 106 mm³ and the mass is 135.063 kg. The spoke portion 20 of this embodiment has a volume of 4.827 × 106 mm³ and a mass of 37.940 kg, representing a 71.909% reduction in mass compared to the comparative example.

[0054] The three-layer spoke helical gear provided by the present invention has a greatly reduced volume and mass compared with existing helical gears while maintaining a large margin in mechanical properties. It can promote the lightweighting of transmission system gears and thus 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. A three-layer spoke plate helical gear, comprising a shaft connecting portion (10), a spoke plate portion (20) and a helical tooth portion (30) connected to each other as one body, wherein the lower surface of the helical 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 (24), a supporting body (25), a first spoke (21), a second spoke (22) and a third spoke (23); The inner ring body (24) 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 (25) has a supporting portion (251) for supporting the lower surface of the oblique tooth portion (30) and in a circular ring shape around the rotation axis, and has an outer peripheral portion (252) extending from the outer edge of the supporting portion (251) away from the oblique tooth portion (30) along the rotation axis; The first spoke (21), the second spoke (22) and the third spoke (23) are arranged in sequence from top to bottom along the rotation axis; the inner edges of the first spoke (21), the second spoke (22) and the third spoke (23) are respectively connected to the inner ring body (24); the outer edge of the first spoke (21) is connected to the supporting portion (251); the outer edge of the third spoke (23) is connected to the outer ring portion (231); the second spoke (22) extends obliquely relative to the rotation axis and its outer edge is connected to the surface of the third spoke (23) facing the first spoke (21); The first spoke (21) has a plurality of first through holes (212) uniformly distributed along the circumferential direction; the second spoke (22) has a plurality of second through holes (222) uniformly distributed along the circumferential direction, and the number and positions of the second through holes (222) correspond one-to-one to the first through holes (212); the third spoke (23) has a plurality of third through holes (232) uniformly distributed along the circumferential direction, and each of the third through holes (232) spans three adjacent second through holes (222) in the circumferential direction.

2. The three-layer spoke helical gear according to claim 1, characterized in that: The projections of the first through hole (212), the second through hole (222) and the third through hole (232) on a projection plane perpendicular to the rotation axis are all line-symmetrical shapes, and the symmetry lines of the three are all perpendicular to the rotation axis.

3. The three-layer spoke helical gear according to claim 2, characterized in that: The symmetry line corresponding to each of the third through holes (232) coincides with the symmetry line corresponding to the second through hole (222) located in the middle position among the three adjacent second through holes (222) spanned by the third through hole (232) in the circumferential direction.

4. The three-layer spoke helical gear according to claim 3, characterized in that: The first spoke (21) comprises a first inner ring portion (211) in a circular shape around the rotation axis; the inner edge of the first inner ring portion (211) is connected to the inner ring body (24), and the first through holes (212) are uniformly distributed along the circumferential direction between the outer edge of the first inner ring portion and the supporting portion (251); the first through holes (212) are arranged on the projection surface by a first curved segment (401), a second curved segment (402), a third curved segment (403), a fourth curved segment (404), a fifth curved segment (405), a sixth curved segment (406), a seventh curved segment (407) and an eighth curved segment (408). The first curved segment (401) and the fifth curved segment (405) are distributed in the radial direction, and are formed by the outer edge of the first inner ring portion (211) and the inner edge of the supporting portion (251), respectively; the third curved segment (403) and the seventh curved segment (407) are distributed in the circumferential direction, and are arc segments that bend toward the inside of the first through hole (212) and have the same curvature; the second curved segment (402), the fourth curved segment (404), the sixth curved segment (406) and the eighth curved segment (408) are arc segments that bend toward the inside of the first through hole (212) and have the same curvature.

5. The three-layer spoke helical gear according to claim 4, characterized in that: The second spoke (22) includes a second inner ring portion (221) in a circular ring shape around the rotation axis; the inner edge of the second inner ring portion (221) is connected to the inner ring body (24), and the second through holes (222) are uniformly distributed along the circumferential direction between the outer edge and the third spoke (23), and the shapes of the second inner ring portion (221) and the second inner ring portion (221) on the projection surface coincide with each other; the third spoke (23) includes an outer ring portion (231) in a circular ring shape around the rotation axis; the outer edge of the outer ring portion (231) is connected to the outer peripheral portion (252), and the third through holes (232) are uniformly distributed along the circumferential direction between the inner edge and the inner ring body (24); the second through holes (222) are formed on the projection surface by the ninth curved segment (409), the tenth curved segment (4010), the eleventh curved segment (4011), the first intersection line (601), The twelfth curved segment (4012) and the thirteenth curved segment (4013) are connected end to end to form a surrounding; the ninth curved segment (409) and the first intersection line (601) are distributed radially, and the first intersection line (601) is the intersection line formed by the tangency of the second through hole (222) and the outer ring portion (231), and the ninth curved segment (409) is formed by the outer edge of the second inner ring portion (221); the eleventh curved segment (4011) and the twelfth curved segment (4012) are distributed circumferentially, and both are arc segments that bend toward the inside of the second through hole (222) and have the same curvature, and both coincide with the third curved segment (403) and the seventh curved segment (407) on the projection surface; the tenth curved segment (4010) and the thirteenth curved segment (4013) are arc segments that bend toward the inside of the second through hole (222) and have the same curvature.

6. The three-layer spoke helical gear according to claim 5, characterized in that: The third through hole (232) is formed on the projection surface by the fourteenth curved segment, the fifteenth curved segment, the first straight segment (501), the sixteenth curved segment, the seventeenth curved segment, the eighteenth curved segment, the second straight segment (502) and the nineteenth curved segment connected end to end; the fourteenth curved segment and the seventeenth curved segment are distributed in the radial direction, and are respectively formed by the outer surface of the inner ring body (24) and the inner edge of the outer ring portion (231); the first straight segment (501) and the second straight segment (502) are distributed in the circumferential direction, and the intersection of their extension lines is located at the rotation axis; the fifteenth curved segment, the sixteenth curved segment, the eighteenth curved segment and the nineteenth curved segment are arc segments that are curved toward the inside of the third through hole (232) and have the same curvature.

7. The three-layer spoke helical gear according to claim 6, characterized in that: The upper surface and the lower surface of the supporting portion (251) intersect with the vertical section passing through the rotation axis to form a third straight line segment (503) and a fourth straight line segment (504), respectively; the outer edge surface and the inner edge surface of the peripheral portion (252) intersect with the vertical section to form a fifth straight line segment (505) and a sixth straight line segment (506), respectively; the third straight line segment (503) is parallel to the fourth straight line segment (504), and both are inclined to the rotation axis; the fifth straight line segment (505) is parallel to the sixth straight line segment (506), and both are parallel to the rotation axis.

8. The three-layer spoke helical gear according to claim 7, characterized in that: The upper surface and the lower surface of the first spoke (21) intersect with the vertical section to form a seventh straight line segment (507) and an eighth straight line segment (508); the seventh straight line segment (507) and the eighth straight line segment (508) are parallel, and both are perpendicular to the rotation axis; The upper surface and the lower surface of the second spoke (22) intersect with the vertical section to form a ninth straight line segment (509) and a tenth straight line segment (5010), respectively; the ninth straight line segment (509) and the tenth straight line segment (5010) are parallel, and both are inclined to the rotation axis; The upper surface and the lower surface of the third spoke (23) intersect with the vertical section to form a second intersection line and a third intersection line, respectively. The second intersection line includes, from the inside to the outside, an eleventh straight line segment (5011) and a twelfth straight line segment (5012), and the third intersection line includes, from the inside to the outside, a thirteenth straight line segment (5013) and a fourteenth straight line segment (5014). The eleventh straight line segment (5011) and the thirteenth straight line segment (5013) are parallel, and both are inclined to the rotation axis, and the inclination angle is smaller than the inclination angle of the ninth straight line segment (509) or the tenth straight line segment (5010) relative to the rotation axis. The twelfth straight line segment (5012) and the fourteenth straight line segment (5014) are parallel, and both are perpendicular to the rotation axis. The outer edge surface and the inner edge surface of the inner ring body (24) intersect with the vertical section to form a fifteenth straight line segment (5015) and a sixteenth straight line segment (5016), respectively. The fifteenth straight line segment (5015) and the sixteenth straight line segment (5016) are parallel, and both are parallel to the rotation axis.

9. The three-layer spoke helical gear according to claim 8, characterized in that: 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 / cm3, then when and hour, The following parameters of the web portion (20) are: ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； ； in, is the radius of the inner edge surface of the inner ring body (24), in units of ; is the radius of the outer edge surface of the supporting body (25), i.e., the outer edge surface of the peripheral portion (252), in units of ; The inner edge of the supporting body (25), i.e., the radius of the inner edge formed by the upper surface of the supporting portion (251), is expressed in units of ; is the radius of the outer edge of the first inner ring portion (211) or the second inner ring portion (221), in units of ; is the radius of the circle on which the third curved segment (403), the seventh curved segment (407), the eleventh curved segment (4011) or the twelfth curved segment (4012) lies on the projection surface, in units of ; is the radius of the inner edge of the outer ring portion (231), in units of ; is the distance from the intersection of the thirteenth straight line segment (5013) and the fourteenth straight line segment (5014) to the rotation axis, in units of ; is the radius of the circle on which the second curve segment (402), the fourth curve segment (404), the sixth curve segment (406) and the eighth curve are located on the projection surface, in units of ; is the radius of the circle on which the tenth curve segment (4010), the thirteenth curve segment (4013), the fifteenth curve segment, the sixteenth curve segment, the eighteenth curve segment and the nineteenth curve segment are located on the projection surface, in units of ; The distance between the intersection of the seventh straight line segment (507) and the sixteenth straight line segment (5016) and the intersection of the fourteenth straight line segment (5014) and the sixteenth straight line segment (5016), in units of ; is the distance from the seventh straight line segment (507) to the eighth straight line segment (508), in units of ; is the distance from the fifteenth straight line segment (5015) to the sixteenth straight line segment (5016), in units of ; is the distance from the third straight line segment (503) to the fourth straight line segment (504), in units of ; is the distance from the fifth straight line segment (505) to the sixth straight line segment (506), in units of ; is the distance from the twelfth straight line segment (5012) to the fourteenth straight line segment (5014), in units of ; is the distance from the eleventh straight line segment (5011) to the thirteenth straight line segment (5013), in units of ; is the distance from the ninth straight line segment (509) to the tenth straight line segment (5010), in units of ; The central angle formed by the intersection between the circle where the third curved segment (403) and the seventh curved segment (407) are located and the outer edge of the first inner ring portion (211) relative to the rotation axis; The central angle formed by the intersection of the circle where the third curved segment (403) and the seventh curved segment (407) respectively lie on the projection surface and the outer edge surface of the outer peripheral portion (252) relative to the rotation axis; is the angle between the third straight line segment (503) and the seventh straight line segment (507); is the angle between the thirteenth straight line segment (5013) and the fourteenth straight line segment (5014); It is the central angle formed by the intersection of the extension lines of the first straight line segment (501) and the second straight line segment (502) with the rotation axis.

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