Inner ring multi-step bevel gear radial plate

Abstract

The invention belongs to the technical field of aviation high-speed transmission, and provides an inner ring multi-step bevel gear radial plate, a radial plate part, a connecting disc part and a central shaft part are sequentially and coaxially connected and are arranged up and down, through holes are formed in the radial plate part, the connecting disc part and the central shaft part to form vertical flow channels, and the radius of the side wall of an inner ring of the radial plate part is larger than that of the side wall of an inner ring of the connecting disc part. The radius of the inner ring side wall of the connecting disc part is larger than that of the inner ring side wall of the center shaft part, a triangular ring cavity is formed in the radial plate part, and an annular groove is formed in the upper end face of the radial plate part. According to the inner ring multi-stage stepped bevel gear wheel disk, the vertical flow channels form a multi-stage stepped structure, and then the resistance of the gear wheel disk to axial loads is improved; and the high pitch diameter resonance frequency and the low pitch diameter resonance frequency are separated while the low pitch diameter resonance frequency is basically unchanged, so that the pitch diameter resonance problem of equipment within the working rotating speed range is avoided, and the overall weight of the bevel gear wheel disk is reduced through the triangular ring cavity.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation high-speed transmission, and particularly relates to an inner ring multi-stage stepped bevel gear web plate. Background Art

[0002] As a core transmission component of an aviation high-speed transmission system, the performance of a bevel gear directly affects the reliability, efficiency, and service life of the system; with the development of aviation equipment towards high speed, integration, heavy load, and lightweight, although the traditional solid configuration bevel gear can meet the basic transmission requirements, it has inherent limitations in terms of lightweight and dynamic performance, and it is difficult to meet the stringent requirements of modern aviation equipment for weight reduction and anti-resonance.

[0003] Moreover, the current optimization research on bevel gears mainly focuses on the optimization of the dimensional parameters of the conventional solid configuration (such as tooth profile modification, module adjustment, etc.). However, due to the weight redundancy of the solid configuration itself, and in a high-speed transmission system, since the meshing excitation direction is consistent with the vibration direction of the diametral vibration, when the rotational speed reaches the critical value, it is extremely easy to excite the diametral traveling wave resonance, resulting in technical problems such as fatigue fracture or tooth surface damage of the solid configuration bevel gear, directly affecting the reliability, energy consumption, and service life of the aviation transmission system.

[0004] In view of this, overcoming the above-mentioned defects of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0005] In view of the above problems, the present invention proposes an inner ring multi-stage stepped bevel gear web plate, including: a web plate part, a connecting disk part, and a central shaft part; The web plate part, the connecting disk part, and the central shaft part are coaxially connected in sequence and are arranged in an upper and lower position. Through holes are opened in the web plate part, the connecting disk part, and the central shaft part to form a vertical flow channel. The radius of the inner side wall of the inner circle of the web plate part is greater than the radius of the inner side wall of the inner circle of the connecting disk part, and the radius of the inner side wall of the inner circle of the connecting disk part is greater than the radius of the inner side wall of the inner circle of the central shaft part; A triangular ring cavity is arranged inside the web plate part, and an annular groove is opened on the upper end surface of the web plate part. The triangular ring cavity and the annular groove are both coaxially arranged with the web plate part.

[0006] Furthermore, the central shaft part includes a lower shaft part and an upper shaft part that are coaxially connected. The upper end of the upper shaft part is coaxially connected to the connecting disk part, and the radius of the inner side wall of the inner circle of the lower shaft part is greater than the radius of the inner side wall of the inner circle of the upper shaft part.

[0007] Furthermore, the end of the inner side wall of the inner circle of the web plate part away from the connecting disk part serves as the end point of the vertical flow channel, and the end of the inner side wall of the inner circle of the central shaft part away from the connecting disk part serves as the starting point of the vertical flow channel. The length of the vertical flow channel is greater than or equal to 45.76 mm and less than or equal to 47.76 mm.

[0008] Furthermore, the height of the lower shaft part is 0.3208 times the length of the vertical flow channel; The distance between one end of the lower shaft part connecting the connecting disk part and the lower end face of the central shaft part is 0.8554 times the length of the vertical flow channel; The distance between one end of the connecting disk part connecting the connecting spoke part and the lower end face of the central shaft part is 0.8860 times the length of the vertical flow channel.

[0009] Furthermore, the radius of the inner side wall of the inner circle of the lower shaft part is 0.2032 times the length of the vertical flow channel; The radius of the inner side wall of the inner circle of the upper shaft part is 0.1618 times the length of the vertical flow channel; The radius of the outer side wall of the outer circle of the central shaft part is 0.2673 times the length of the vertical flow channel; The radius of the inner side wall of the inner circle of the connecting disk part is 0.2032 times the length of the vertical flow channel; The radius of the inner side wall of the inner circle of the spoke part is 0.22575 times the length of the vertical flow channel.

[0010] Furthermore, the spoke part includes a first inclined surface facing the connecting disk part side, a downward end surface, and a second inclined surface, a third inclined surface, and an inner groove surface on the side facing away from the connecting disk part; The first inclined surface connects the outer side wall of the connecting disk part and one end of the downward end surface, and the other end of the downward end surface connects one end of the outer side wall of the spoke part. The downward end surface is horizontally arranged; The second inclined surface connects the inner side wall of the inner circle of the spoke part and one end of the inner groove surface. The other end of the inner groove surface connects one end of the third inclined surface. The third inclined surface connects the other end of the outer side wall of the spoke part. The second inclined surface is parallel to the first inclined surface, and the outer side wall of the connecting disk part is parallel to the inner side wall of the connecting disk part; The inner groove surface is the bottom surface of the annular groove.

[0011] Furthermore, the cross-section of the triangular ring cavity includes a first straight side, a second straight side, and a third straight side, and the first straight side, the second straight side, and the third straight side are all connected by curved sides; The length of the first straight side is 0.1332 times the length of the vertical flow channel; The length of the second straight side is 0.1041 times the length of the vertical flow channel; The length of the third straight side is 0.2139 times the length of the vertical flow channel; The curved side radius of the first straight side and the second straight side is 0.0177 times the length of the vertical flow channel; The curved side radius of the first straight side and the third straight side is 0.0214 times the length of the vertical flow channel; The curved side radius of the second straight side and the third straight side is 0.0428 times the length of the vertical flow channel.

[0012] Further, a ring groove is coaxially formed in the outer side wall of the lower shaft portion adjacent to one end of the upper shaft portion. The ring groove includes an inclined surface and a vertical surface. The inclined surface connects the outer side wall of the lower shaft portion and one end of the vertical surface, and the other end of the vertical surface connects the outer side wall of the upper shaft portion; The width of the inclined surface is 0.0308 times the length of the vertical flow channel; The width of the vertical surface is 0.0186 times the length of the vertical flow channel.

[0013] Further, a plurality of straight through holes are formed in the web portion and arranged in a circumferential array, and a plurality of inclined through holes are formed in the side wall of the central shaft portion in a circumferential array.

[0014] Further, the density of the material for making the multi-stage stepped bevel gear web of the inner ring is less than or equal to 7.85 g / cm 3 , and the yield strength of the material for making the bevel gear web is less than or equal to 1331 MPa.

[0015] Compared with the prior art, the embodiments of the present invention have at least the following advantages: For the multi-stage stepped bevel gear web of the inner ring of the present invention, by adjusting the inner side walls of the web portion, the connecting disk portion, and the central shaft portion to extend in the vertical direction, and on the basis that the inner side wall radii of the central shaft portion, the connecting disk portion, and the entire web portion decrease in sequence, a multi-stage stepped structure is formed for the vertical flow channel, thereby enhancing the resistance of the gear web to axial loads; and while the low pitch diameter resonance frequency remains basically unchanged, the high pitch diameter resonance frequency is increased, so that the low and high pitch diameter resonance frequencies are separated, thus avoiding the pitch diameter resonance problem during the operating speed range of the equipment; at the same time, a ring-shaped groove is formed in the web portion to achieve stress dispersion. On the basis of ensuring the overall rigidity of the bevel gear web and that the low and high pitch diameter resonance frequencies do not fall within the operating speed range, the overall weight of the bevel gear web is reduced through the triangular ring cavity to meet the technical requirement of weight reduction.

[0016] Other features and advantages of the present invention will be described in the following specification, and some of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification and the drawings. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1Shows a schematic cross-sectional view of the inner ring multi-stage stepped bevel gear web in an embodiment of the present invention; Figure 2 Shows a schematic diagram of the inner ring multi-stage stepped bevel gear web and teeth in an embodiment of the present invention; Figure 3 Shows the schematic dimension marking of the inner ring multi-stage stepped bevel gear web in an embodiment of the present invention Figure 1 ; Figure 4 Shows the schematic dimension marking of the inner ring multi-stage stepped bevel gear web in an embodiment of the present invention Figure 2 ; Figure 5 Shows an enlarged schematic diagram of Structure A in an embodiment of the present invention; Figure 6 Shows an enlarged schematic diagram of Structure B in an embodiment of the present invention; Figure 7 Shows the von Mises stress calculation nephogram of the front and back of the multi-stage gear structure in an embodiment of the present invention; Figure 8 Shows the schematic diagrams of the seventh and eighth vibration modes of the multi-stage gear in an embodiment of the present invention; Figure 9 Shows the Campbell diagram of the modal analysis of the multi-stage gear in an embodiment of the present invention; Figure 10 Shows the Campbell diagram of the modal analysis of the gear in an embodiment of the present invention; Figure 11 Shows the schematic cross-sectional structure diagram of the solid bevel gear; Figure 12 Shows the Campbell diagram of the modal analysis of the solid bevel gear.

[0019] In the figure, there are web portion 1, connection disk portion 2, central shaft portion 3, lower shaft portion 301, upper shaft portion 302, ring groove 303, triangular ring cavity 4, annular groove 5, straight through hole 6, and inclined through hole 7. Detailed implementation manners

[0020] The following description provides many different embodiments or examples for implementing different features of the present invention. The elements and arrangements described in the following specific examples are only used to concisely express the present invention, and they are only examples and are not intended to limit the present invention.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0022] The present invention provides an inner-ring multi-stage stepped bevel gear web plate. Figure 1 The cross-sectional schematic diagram of the inner-ring multi-stage stepped bevel gear web plate in the embodiment of the present invention is shown. Figure 1 In this, the inner-ring multi-stage stepped bevel gear web plate includes: a web plate portion 1, a connection disk portion 2, and a central shaft portion 3. The web plate portion 1, the connection disk portion 2, and the central shaft portion 3 are coaxially connected in sequence and arranged in a vertical position. Through holes are opened in the web plate portion 1, the connection disk portion 2, and the central shaft portion 3 to form a vertical flow channel. The radius of the inner side wall of the inner circle of the web plate portion 1 is greater than the radius of the inner side wall of the inner circle of the connection disk portion 2, and the radius of the inner side wall of the inner circle of the connection disk portion 2 is greater than the radius of the inner side wall of the inner circle of the central shaft portion 3. A triangular ring cavity 4 is provided in the web plate portion 1, and an annular groove 5 is opened on the upper end surface of the web plate portion 1. The triangular ring cavity 4 and the annular groove 5 are both coaxially arranged with the web plate portion 1.

[0023] Based on the web plate portion 1, the connection disk portion 2, and the central shaft portion 3, the inner-ring multi-stage stepped bevel gear web plate of this application is divided into three functional intervals. On the basis that the inner circle radii of the central shaft portion 3, the connection disk portion 2, and the web plate portion 1 decrease gradually, a gradient transition is formed to enhance the resistance to axial force; and through the triangular ring cavity 4, a large reduction in mass is completed while ensuring a small change in the resonance point frequency, realizing lightweight under the premise of meeting the load-bearing requirements of the device.

[0024] In this case, the central shaft portion 3 includes a lower shaft portion 301 and an upper shaft portion 302 that are coaxially connected. The upper end of the upper shaft portion 302 is coaxially connected to the connection disk portion 2, and the radius of the inner side wall of the inner circle of the lower shaft portion 301 is greater than the radius of the inner side wall of the inner circle of the upper shaft portion 302.

[0025] On the basis that the inner circle radii of the central shaft portion 3, the connection disk portion 2, and the web plate portion 1 decrease gradually, the central shaft portion 3 is further divided into a lower shaft portion 301 and an upper shaft portion 302. By setting the radius of the inner side wall of the inner circle of the lower shaft portion 301 to be greater than the radius of the inner side wall of the inner circle of the upper shaft portion 302, the technical effect of the three-stage inner diameter decrease becomes a four-stage inner diameter decrease, further enhancing the resistance to axial force.

[0026] Refer to Figure 1, wherein, in order to improve the convenience of installing the device of the present application, a plurality of inclined through holes 7 are circumferentially arrayed on the side wall of the central shaft portion 3, and the inclination angle of the plurality of inclined through holes 7 with respect to the horizontal plane is 45°, so as to facilitate the bolt installation of the whole device from below.

[0027] In addition, a ring groove 303 is coaxially opened on the outer side wall of the lower shaft portion 301 adjacent to one end of the upper shaft portion 302 to achieve buffering of the axial stress between the lower shaft portion 301 and the upper shaft portion 302.

[0028] In this case, one end of the inner side wall of the web portion 1 away from the connection disk portion 2 serves as the end point of the vertical flow channel, and one end of the inner side wall of the central shaft portion 3 away from the connection disk portion 2 serves as the starting point of the vertical flow channel. Taking the vertical flow channel length D4 as a value (independent variable) to be given during design, it is set that the vertical flow channel length D4 is greater than or equal to 45.76 mm and less than or equal to 47.76 mm; Correspondingly, the height D1 of the lower shaft portion 301 is 0.3208 times the vertical flow channel length D4; The distance D2 between one end of the lower shaft portion 301 connecting the connection disk portion 2 and the lower end surface of the central shaft portion 3 is 0.8554 times the vertical flow channel length D4; The distance D3 between one end of the connection disk portion 2 connecting the web portion 1 and the lower end surface of the central shaft portion 3 is 0.8860 times the vertical flow channel length D4.

[0029] Based on the above, the vertical flow channel is divided into four parts. Among them, the inner cavity of the lower shaft portion 301 serves as the first flow channel, the inner cavity of the lower shaft portion 301 serves as the second flow channel, the inner cavity of the lower shaft portion 301 serves as the third flow channel, and the inner cavity of the lower shaft portion 301 serves as the fourth flow channel.

[0030] The lengths of the first flow channel, the second flow channel, the third flow channel, and the fourth flow channel are limited according to D1, D2, D3, and D4.

[0031] Correspondingly, the radius R1 of the inner side wall of the lower shaft portion 301 is 0.2032 times the vertical flow channel length D4; The radius R2 of the inner side wall of the upper shaft portion 302 is 0.1618 times the vertical flow channel length D4; The radius R3 of the outer side wall of the central shaft portion 3 is 0.2673 times the vertical flow channel length D4; The radius R4 of the inner side wall of the connection disk portion 2 is 0.2032 times the vertical flow channel length D4; The radius R5 of the inner side wall of the web portion 1 is 0.2575 times the vertical flow channel length D4.

[0032] Furthermore, the radii of the inner side walls of the lower shaft portion 301, the upper shaft portion 302, the connection disk portion 2, and the web portion 1 are limited, ensuring the integrity of the device.

[0033] In this case, the web portion 1 includes a first inclined surface facing one side of the connection disk portion 2, a downward end surface, a second inclined surface, a third inclined surface, and an inner groove surface on the side facing away from the connection disk portion 2; The first inclined surface connects the outer side wall of the connection disk portion 2 and one end of the downward end surface, the other end of the downward end surface connects one end of the outer side wall of the web portion 1, and the downward end surface is horizontally arranged; The second inclined surface connects the inner side wall of the web portion 1 and one end of the inner groove surface, the other end of the inner groove surface connects one end of the third inclined surface, and the third inclined surface connects the other end of the outer side wall of the web portion 1. The second inclined surface is parallel to the first inclined surface, and the outer side wall of the connection disk portion 2 is parallel to the inner side wall of the connection disk portion 2; The inner groove surface is the bottom surface of the annular groove 5.

[0034] Exemplarily, in Figure 3 the example shown, the first included angle α1 between the first inclined surface and the upper end surface of the connection disk portion 2 is 155°; The second included angle α2 between the second inclined surface and the upper end surface of the connection disk portion 2 is 25°; The third included angle α3 between the third inclined surface and the upper end surface of the connection disk portion 2 is 43.1°; In this case, Figure 10 the Campbell diagram of the gear modal analysis without the triangular ring cavity 4 in the embodiment of the present invention is shown; in the speed test interval, from left to right, there are four speed values, which are set as the first speed, the second speed, the third speed, and the fourth speed. Among them, the interval from the first speed to the fourth speed is the test interval, and the interval from the second speed to the third speed is the working interval; Among them, the line X1 corresponds to points a, b, c, and d in the interval from the first speed to the fourth speed. Among them, point a represents the low pitch diameter resonance point, point d is the high pitch diameter resonance point, and points b and c are non-pitch diameter resonance points.

[0035] For points a and d, in the design process of the triangular ring cavity 4, with the increase of the cross-sectional area of the triangular ring cavity 4, the coordinate points of points a, b, c, and d will move along the line X1 in the coordinate system; correspondingly, the frequencies of points a and d gradually increase with the increase of the cross-sectional area of the triangular ring cavity 4, and at the same time, the distance between points a and d gradually decreases; Correspondingly, the cross-section of the triangular ring cavity 4 includes a first straight side, a second straight side, and a third straight side, and the first straight side, the second straight side, and the third straight side are all connected by curved sides; It is set that the length of the first straight side is 0.1332 times the length of the vertical flow channel D4; The length of the second straight side is 0.1041 times the length of the vertical flow channel D4; The length of the third straight side is 0.2139 times the length of the vertical flow channel D4; The fillet radius of the first straight edge and the second straight edge is 0.0177 times the length D4 of the vertical flow channel; The fillet radius of the first straight edge and the third straight edge is 0.0214 times the length D4 of the vertical flow channel; The fillet radius of the second straight edge and the third straight edge is 0.0428 times the length D4 of the vertical flow channel.

[0036] Exemplarily, in Figure 5 the example shown, the first included angle α4 between the first straight edge and the upper end face of the connection disk portion 2 is 24.4°; the first included angle α5 between the second straight edge and the upper end face of the connection disk portion 2 is 46.4°; the first included angle α6 between the third straight edge and the upper end face of the connection disk portion 2 is 45°.

[0037] Referring to Figure 9 , the Campbell diagram of the multi-stage gear modal analysis in the embodiment of the present invention is shown, so that points a and d are respectively moved to positions A and D, so as to ensure that neither point A nor point D belongs to the interval range between the second rotational speed and the third rotational speed, and on this basis, the maximum volume ratio of the triangular ring cavity 4 inside the web portion 1 is realized, while meeting the requirements of the resonance point discharge working speed range of the two pitch diameters, a significant reduction in mass is achieved.

[0038] In this case, the ring groove 303 includes an inclined surface and a vertical surface. The inclined surface connects the outer side wall of the lower shaft portion 301 and one end of the vertical surface, and the other end of the vertical surface connects the outer side wall of the upper shaft portion 302; The width of the inclined surface is 0.0308 times the length D4 of the vertical flow channel; The width of the vertical surface is 0.0186 times the length D4 of the vertical flow channel.

[0039] In this case, the density of the material used to make the multi-stage stepped bevel gear web of the inner cone ring is less than or equal to 7.85 g / cm 3 , and the yield strength of the material used to make the bevel gear web is less than or equal to 1331 MPa.

[0040] To further illustrate the present application, referring to Figure 3 , Figure 5 and Figure 6 , on the basis that the length D4 of the vertical flow channel is greater than or equal to 45.76 mm and less than or equal to 47.76 mm, the parameters of each structure are sorted out and described: D1 represents the height D1 of the lower shaft portion 301, and D1 = 0.3208 * D4; D2 represents the distance between one end of the lower shaft portion 301 connecting the connection disk portion 2 and the lower end face of the central shaft portion 3, and D2 = 0.8554 * D4; D3 represents the distance between one end of the connecting disc portion 2 connecting the spoke plate portion 1 and the lower end face of the central shaft portion 3, and D3 = 0.8860 * D4; D4 represents the length of the vertical flow channel, 45.76 mm ≤ D4 ≤ 47.76 mm; D5 represents the aperture diameter of the inclined through hole 7, and D5 = 0.0214 * D4; D6 represents the aperture diameter of the straight through hole 6, and D6 = 0.0641 * D4; D7 represents the width of the inclined surface of the annular groove 303, and D7 = 0.0308 * D4; D8 represents the difference in radius between the outer wall of the central shaft portion 3 and the outer wall of the connecting disc portion 2, and D8 = 0.0641 * D4; D9 represents the width of the outer side wall of the spoke plate portion 1, and D9 = 0.0500 * D4; D10 represents the width of the second inclined surface of the spoke plate portion 1, and D10 = 0.2523 * D4; D11 represents the width of the third inclined surface of the spoke plate portion 1, and D11 = 0.1711 * D4; D12 represents the length of the first straight side of the triangular ring cavity 4, and the first straight side is the longest side of the cross-sectional structure of the triangular ring cavity 4, and D12 = 0.1332 * D4; D13 represents the length of the second straight side of the triangular ring cavity 4, and D13 = 0.1041 * D4; D14 represents the length of the third straight side of the triangular ring cavity 4, and the first straight side is the shortest side of the cross-sectional structure of the triangular ring cavity 4, and D14 = 0.2139 * D4; D15 represents the width of the vertical surface of the annular groove 303, and D15 = 0.0186 * D4; It should be further noted that the inner diameters and thicknesses of the spoke plate portion 1, the connecting disc portion 2, and the central shaft portion 3 are further defined. Taking the axis line of the central shaft portion 3 as the center of the circle, combined with Figure 3 it is described as follows: R1 represents the radius of the inner side wall of the lower shaft portion 301, and R1 = 0.2032 * D4; R2 represents the radius of the inner side wall of the upper shaft portion 302, and R2 = 0.1618 * D4; R3 represents the radius of the outer side wall of the central shaft portion 3, and R3 = 0.2673 * D4; R4 represents the radius of the inner side wall of the connecting disc portion 2, and R4 = 0.2032 * D4; R5 represents the radius of the inner side wall of the spoke plate portion 1, and R5 = 0.2575 * D4; R6 represents the radius of the vertical surface of the annular groove 303, and R6 = 0.2406 * D4; Correspondingly, the annular groove 303 includes an inclined surface and a vertical surface, and the connections between the inclined surface and the outer side wall of the lower shaft portion 301, and between the vertical surface and the outer side wall of the upper shaft portion 302 are both transitioned with curved surfaces; R7 represents the curved surface radius at the connection between the inclined surface and the outer side wall of the lower shaft portion 301, and R7 = 0.0171 * D4; R8 represents the curved surface radius at the connection between the vertical surface and the outer side wall of the upper shaft portion 302, and R8 = 0.0171 * D4; In this case, the first inclined surface and the outer side wall of the connection disc portion 2, and the downward end surface and the outer side wall of the web portion 1 are both transitioned with curved surfaces; R9 represents the curved surface radius at the connection between the first inclined surface and the outer side wall of the connection disc portion 2, and R9 = 0.0214 * D4; R10 represents the curved surface radius at the connection between the downward end surface and the outer side wall of the web portion 1, and R10 = 0.0043 * D4; R11 represents the curved surface radius of the cross-section of the annular groove 5, and R11 = 0.0265 * D4; R12 represents the curved edge radius connecting the first straight edge and the second straight edge in the cross-sectional structure of the triangular ring cavity 4; R12 = 0.0177 * D4; R13 represents the curved edge radius connecting the first straight edge and the third straight edge in the cross-sectional structure of the triangular ring cavity 4; R13 = 0.0214 * D4; R14 represents the curved edge radius connecting the second straight edge and the third straight edge in the cross-sectional structure of the triangular ring cavity 4; R14 = 0.0428 * D4; In this embodiment, the connections between the outer side wall of the central shaft portion 3 and the lower end surface of the connection disc portion 2, between the inner side wall of the connection disc portion 2 and the upper end surface of the central shaft portion 3, between the inner side wall of the connection disc portion 2 and the upper end surface of the connection disc portion 2, and between the inner side wall of the web portion 1 and the upper end surface of the connection disc portion 2 are all transitioned with curved surfaces; R15 represents the curved surface radius at the connection between the outer side wall of the central shaft portion 3 and the lower end surface of the connection disc portion 2, and R15 = 0.0064 * D4; R16 represents the curved surface radius at the connection between the inner side wall of the connection disc portion 2 and the upper end surface of the central shaft portion 3, and R16 = 0.0107 * D4; R17 represents the curved surface radius at the connection between the inner side wall of the connection disc portion 2 and the upper end surface of the connection disc portion 2, and R17 = 0.0107 * D4; R18 represents the curved surface radius at the connection between the inner side wall of the web portion 1 and the upper end surface of the connection disc portion 2, and R18 = 0.0107 * D4.

[0041] Combined Figure 4 , Figure 4 shows a cross-sectional schematic diagram of the bevel gear web and teeth of the present application, and further defines: d1 represents the width of the connection surface between the tooth and the web of the bevel gear, and d1 ≤ 8.1 mm; d2 represents the width of the circumferential constraint surface of the web of the bevel gear, and 22 mm ≤ d2 ≤ 23.7 mm; d3 represents the width of the radial constraint surface of the web of the bevel gear, and 23 mm ≤ d3 ≤ 24 mm; d4 represents the width of the axial direction constraint surface of the web of the bevel gear, and 2 mm ≤ d4 ≤ 3 mm.

[0042] Among them, the first included angle α1 between the first inclined plane and the upper end surface of the connection disk part 2 is 155°; The second included angle α2 between the second inclined plane and the upper end surface of the connection disk part 2 is 25°; The third included angle α3 between the third inclined plane and the upper end surface of the connection disk part 2 is 43.1°; the first included angle α4 between the first straight edge and the upper end surface of the connection disk part 2 is 24.4°; The first included angle α5 between the second straight edge and the upper end surface of the connection disk part 2 is 46.4°; The first included angle α6 between the third straight edge and the upper end surface of the connection disk part 2 is 45°.

[0043] Combining the above content, referring to Figure 2 , taking the 16Ni (alloy steel with a nickel content of about 16%) with a density of 7.85 g / cm 3 as the raw material to manufacture the web of the bevel gear of this application as an example, the yield strength of the material of the corresponding web of the bevel gear ≤ 1331 MPa, taking the input load as the maximum, and completing the assembly of the web of the bevel gear of this application and the corresponding tooth to form a multi-stage gear, the total mass after the multi-stage gear is 0.22060 kg; Referring to Figure 3 , based on the vertical flow channel length D4 = 46.76 mm, the dimensional parameters of the web structure of the bevel gear of this application are as follows: D1 represents the height D1 of the lower shaft part 301, and D1 = 15 mm; D2 represents the distance between one end of the lower shaft part 301 connecting the connection disk part 2 and the lower end surface of the central shaft part 3, and D2 = 40 mm; D3 represents the distance between one end of the connection disk part 2 connecting the web part 1 and the lower end surface of the central shaft part 3, and D3 = 41.43 mm; D4 represents the vertical flow channel length, and D4 = 46.76 mm; D5 represents the aperture of the inclined through hole 7, and D5 = 1 mm; D6 represents the aperture of the straight through hole 6, and D6 = 3 mm; D7 represents the width of the inclined surface of the annular groove 303, and D7 = 1.44 mm; D8 represents the radius difference between the outer wall of the central shaft part 3 and the outer wall of the connection disk part 2, and D8 = 3 mm; D9 represents the width of the outer sidewall of the web portion 1, D9 = 2.34 mm; D10 represents the width of the second inclined surface of the web portion 1, D10 = 11.8 mm; D11 represents the width of the third inclined surface of the web portion 1, D11 = 8 mm; D12 represents the length of the first straight side of the triangular ring cavity 4. The first straight side is the longest side of the cross-sectional structure of the triangular ring cavity 4, D12 = 6.23 mm; D13 represents the length of the second straight side of the triangular ring cavity 4, D13 = 4.87 mm; D14 represents the length of the third straight side of the triangular ring cavity 4. The first straight side is the shortest side of the cross-sectional structure of the triangular ring cavity 4, D14 = 1 mm; D15 represents the width of the vertical surface of the ring groove 303, D15 = 0.87 mm; R1 represents the radius of the inner sidewall of the lower shaft portion 301, R1 = 9.5 mm; R2 represents the radius of the inner sidewall of the upper shaft portion 302, R2 = 7.57 mm; R3 represents the radius of the outer sidewall of the central shaft portion 3, R3 = 12.5 mm; R4 represents the radius of the inner sidewall of the connection disk portion 2, R4 = 9.5 mm; R5 represents the radius of the inner sidewall of the web portion 1, R5 = 12.04 mm; R6 represents the radius of the vertical surface of the ring groove 303, R6 = 11.25 mm; R7 represents the radius of the curved surface at the connection of the inclined surface and the outer sidewall of the lower shaft portion 301, R7 = 0.8 mm; R8 represents the radius of the curved surface at the connection of the vertical surface and the outer sidewall of the upper shaft portion 302, R8 = 0.8 mm; R9 represents the radius of the curved surface at the connection of the first inclined surface and the outer sidewall of the connection disk portion 2, R9 = 1 mm; R10 represents the radius of the curved surface at the connection of the downward end face and the outer sidewall of the web portion 1, R10 = 0.2 mm; R11 represents the radius of the curved surface of the cross-section of the annular groove 5, R11 = 1.24 mm; R12 represents the radius of the curved edge connecting the first straight side and the second straight side in the cross-sectional structure of the triangular ring cavity 4; R12 = 0.83 mm; R13 represents the radius of the curved edge connecting the first straight side and the third straight side in the cross-sectional structure of the triangular ring cavity 4; R13 = 1 mm; R14 represents the radius of the curved edge connecting the second straight side and the third straight side in the cross-sectional structure of the triangular ring cavity 4; R14 = 2 mm; R15 represents the radius of the curved surface where the outer ring side wall of the central axis portion 3 is connected to the lower end surface of the connecting plate portion 2, R15=0.3mm; R16 represents the radius of the curved surface where the inner ring side wall of the connecting disc portion 2 and the upper end surface of the central shaft portion 3 are connected, R16=0.5mm; R17 represents the radius of the curved surface where the inner ring side wall of the connecting plate portion 2 is connected to the upper end surface of the connecting plate portion 2, R17=0.5mm; R18 represents the radius of the curved surface at the connection between the inner circle side wall of the spoke plate portion 1 and the upper end surface of the connecting plate portion 2, R18=0.5mm.

[0044] Combination Figure 4 , Figure 4 A cross-sectional schematic diagram of the bevel gear spoke and teeth of the present application is shown, further defining: d1 represents the width of the connection surface between the tooth and the bevel gear spoke, d1=8mm; d2 represents the width of the circumferential constraint surface of the bevel gear spoke, d2=23.7mm; d3 represents the width of the radial constraint surface of the bevel gear spoke, d3=24mm; d4 represents the width of the axial constraint surface of the bevel gear spoke, d4=3mm.

[0045] At the same time, the tangential component of the tooth meshing force is limited to: Ft≤7350.5N; The axial force limiting the tooth meshing force: Fa≤254N; The radial component of the tooth meshing force is limited to: Fr≤3898N; The rated speed of the teeth is limited to: 26299rpm≤ω≤37520rpm.

[0046] The above multi-stage gear structure is subjected to static analysis, and the multi-stage gear structure network is gridded. The grid unit size is 0.2 mm, and the number of grid units is 2900376. Figure 7 , Figure 7 The left side shows the von-Mises stress calculation cloud diagram of the front side under the external load in the multi-stage gear structure analysis. Figure 7 The right side shows the calculated von-Mises stress cloud diagram on the back side under external load in the multi-stage gear structure analysis; analysis shows that under different working conditions, the maximum von-Mises stress at the bevel gear spoke is between 800MPa and 900MPa.

[0047] It should be noted that von-Mises stress is used to evaluate the yield risk of materials under complex loads, and its value directly reflects the strength safety margin of the structure under actual working conditions.

[0048] Based on the fact that the maximum von-Mises stress at the multi-stage gear is between 800 MPa and 900 MPa, and the yield strength of the corresponding bevel gear web material ≤ 1331 MPa, it indicates that the bevel gear web structure of this application is in a safe state under the ultimate load.

[0049] It should be added that considering that when the bevel gear is in a working environment with a relatively high rotational speed, there are various different vibration modes within its working rotational speed range, and the diametral traveling wave resonance is an important form of fatigue failure. Since the meshing force is the main excitation source of gear vibration, when the gear meshes, the vibration wave generated at the meshing point propagates circumferentially. Also, because the excitation direction during gear meshing is the same as the vibration direction of the diametral vibration, when the rotational speed reaches a certain value, it causes the excitation of the diametral traveling wave resonance. And compared with other mode resonances, the diametral traveling wave resonance has a larger vibration amplitude, the gear is more likely to be damaged, and the risk is higher.

[0050] In this embodiment, the diametral mode and the diametral resonance frequency of the multi-stage gear are detected through the modal shape and the projection of the excitation vector.

[0051] Taking the rated rotational speed of the multi-stage gear as 35066 rpm as an example, 75% - 107% of the rated rotational speed is the gear working rotational speed region. In Figure 8 the example shown on the left, it is analyzed that the seventh order is the two-diametral mode; in Figure 8 the example shown on the right, it is analyzed that the eighth order mode is the three-diametral mode, and the resonance point is close to the working region.

[0052] Combined with Figure 9 the analysis results of the Campbell diagram shown, the resonance point rotational speeds of the seventh order and the eighth order are 74.09% and 107.05% respectively, meeting the design requirements.

[0053] Combined with Figure 8 , the seventh order corresponding to the multi-stage gear is obtained as the two-diametral mode, and the eighth order mode corresponding to the multi-stage gear is obtained as the three-diametral mode; combined with Figure 9 the analysis results of the Campbell diagram of, the resonance point rotational speeds of the seventh order and the eighth order are 74.09% and 107.05% respectively; it can be seen that the seventh order 74.09% rated rotational speed is lower than the lower limit 75% of the working range rated rotational speed, and the eighth order 107.05% rated rotational speed is higher than the upper limit 107% of the working range, both avoiding the dangerous working condition area and preventing the occurrence of resonance. The present invention actively regulates the resonance frequency distribution through structural topology optimization, meeting the working condition safety requirements.

[0054] In order to compare with the traditional solid bevel gear web structure, Figure 11Shows a schematic cross-sectional structure diagram of a traditional solid bevel gear web and teeth assembly, with a corresponding mass of 0.24750 kg. After calculation, the web stress is less than the material yield strength and less than 900 MPa; Figure 12 Shows the Campbell diagram analysis results of the solid bevel gear structure. The analysis shows that the eighth-order resonance speed is 94.34%, which belongs to the working speed range of 75% to 107%, and cannot meet the vibration safety requirements, and the mass is relatively large; In summary, the traditional solid bevel gear web structure cannot effectively resist axial loads, and the eighth-order resonance point is lower than 107%, which cannot meet the design requirements.

[0055] The bevel gear web provided by the present invention reduces the mass by 10.87% compared with the traditional solid bevel gear web structure, and adjusts the seventh-order and eighth-order resonance speeds to 74.09% and 107.05% respectively, meeting the vibration requirements, successfully avoiding the risk of dangerous resonance within the working speed range, having good dynamic performance, reducing the mass of the gear on the premise of having a large margin in static performance, reducing the volume, and obtaining a more valuable configuration.

[0056] In this application, by adjusting the inner side walls of the web part 1, the connecting disk part 2, and the central shaft part 3 to extend vertically, and on the basis that the inner side wall radii of the central shaft part 3, the connecting disk part 2, and the entire web part 1 decrease in sequence, a multi-stage stepped structure is formed for the vertical flow channel, thereby enhancing the resistance of the gear web to axial loads, making the low pitch diameter resonance frequency basically unchanged while increasing the high pitch diameter resonance frequency, separating the low and high pitch diameter resonance frequencies, increasing the distance between the low and high pitch diameter resonance points, ensuring that the low and high pitch diameter resonance points do not belong to the working speed range, so as to avoid the problem of pitch diameter resonance during the working speed range of the equipment; and by opening the triangular ring cavity 4, the frequencies of both the low and high pitch diameter resonance points are increased simultaneously. On the basis that the low and high pitch diameter resonance points do not belong to the working speed range, the volume of the triangular ring cavity 4 is maximized, thereby achieving the weight reduction effect and reducing the stress concentration phenomenon, and realizing lightweight under the premise of meeting the load-bearing requirements of the device.

[0057] At the same time, an annular groove 5 is opened in the web part 1 to further disperse the stress and reduce the weight.

[0058] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of multiple components or the interaction relationship of multiple components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the description of the present invention, it should be understood that all terms indicating orientation or positional relationship are based on the orientation or positional relationship 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 orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation of the present invention.

[0061] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An inner ring multi-stage stepped bevel gear web, characterized in that, Comprising: Web part (1), connection disk part (2), central shaft part (3); The web part (1), connection disk part (2), and central shaft part (3) are coaxially connected in sequence and arranged vertically. Through holes are provided in the web part (1), connection disk part (2), and central shaft part (3) to form a vertical flow channel. The radius of the inner sidewall of the inner circle of the web part (1) is greater than the radius of the inner sidewall of the inner circle of the connection disk part (2), and the radius of the inner sidewall of the inner circle of the connection disk part (2) is greater than the radius of the inner sidewall of the inner circle of the central shaft part (3); A triangular ring cavity (4) is provided in the web part (1), and an annular groove (5) is provided on the upper end surface of the web part (1). The triangular ring cavity (4) and the annular groove (5) are coaxially arranged with the web part (1).

2. The inner ring multi-stage stepped bevel gear web according to claim 1, characterized in that The central shaft part (3) includes a lower shaft part (301) and an upper shaft part (302) that are coaxially connected. The upper end of the upper shaft part (302) is coaxially connected to the connection disk part (2), and the radius of the inner sidewall of the inner circle of the lower shaft part (301) is greater than the radius of the inner sidewall of the inner circle of the upper shaft part (302).

3. The inner ring multi-stage stepped bevel gear web according to claim 2, characterized in that, One end of the inner sidewall of the inner circle of the web part (1) away from the connection disk part (2) serves as the end point of the vertical flow channel, and one end of the inner sidewall of the inner circle of the central shaft part (3) away from the connection disk part (2) serves as the starting point of the vertical flow channel. The length of the vertical flow channel is greater than or equal to 45.76 mm and less than or equal to 47.76 mm.

4. The inner ring multi-stage stepped bevel gear web according to claim 3, characterized in that, The height of the lower shaft part (301) is 0.3208 times the length of the vertical flow channel; The distance between the end of the lower shaft part (301) connecting the connection disk part (2) and the lower end face of the central shaft part (3) is 0.8554 times the length of the vertical flow channel; The distance between the end of the connection disk part (2) connecting the web part (1) and the lower end face of the central shaft part (3) is 0.8860 times the length of the vertical flow channel.

5. The inner ring multi-stage stepped bevel gear web according to claim 4, characterized in that The radius of the inner sidewall of the inner circle of the lower shaft part (301) is 0.2032 times the length of the vertical flow channel; The radius of the inner sidewall of the inner circle of the upper shaft part (302) is 0.1618 times the length of the vertical flow channel; The radius of the outer sidewall of the central shaft part (3) is 0.2673 times the length of the vertical flow channel; The radius of the inner sidewall of the inner circle of the connection disk part (2) is 0.2032 times the length of the vertical flow channel; The radius of the inner sidewall of the inner circle of the web part (1) is 0.22575 times the length of the vertical flow channel.

6. The inner ring multi-stage stepped bevel gear web according to claim 5, characterized in that, The web part (1) includes a first inclined surface on the side facing the connection disk part (2), a downward end surface, and a second inclined surface, a third inclined surface, and an inner groove surface on the side facing away from the connection disk part (2); The first inclined surface connects the outer sidewall of the connection disk part (2) and one end of the downward end surface. The other end of the downward end surface connects one end of the outer sidewall of the web part (1). The downward end surface is horizontally arranged; The second inclined surface connects the inner sidewall of the inner circle of the web part (1) and one end of the inner groove surface. The other end of the inner groove surface connects one end of the third inclined surface. The third inclined surface connects the other end of the outer sidewall of the web part (1). The second inclined surface is parallel to the first inclined surface, and the outer sidewall of the connection disk part (2) is parallel to the inner sidewall of the connection disk part (2); The inner groove surface is the groove bottom surface of the annular groove (5).

7. The inner ring multi-stage stepped bevel gear web according to claim 6, wherein The cross-section of the triangular ring cavity (4) includes a first straight side, a second straight side, and a third straight side, and the first straight side, the second straight side, and the third straight side are all connected by curved sides; The length of the first straight side is 0.1332 times the length of the vertical flow channel; The length of the second straight side is 0.1041 times the length of the vertical flow channel; The length of the third straight side is 0.2139 times the length of the vertical flow channel; The radius of the curved sides of the first straight side and the second straight side is 0.0177 times the length of the vertical flow channel; The radius of the curved sides of the first straight side and the third straight side is 0.0214 times the length of the vertical flow channel; The radius of the curved sides of the second straight side and the third straight side is 0.0428 times the length of the vertical flow channel.

8. The inner ring multi-stage stepped bevel gear web according to claim 4, characterized in that, A ring groove (303) is coaxially opened on the outer side wall of the lower shaft portion (301) adjacent to one end of the upper shaft portion (302). The ring groove (303) includes an inclined surface and a vertical surface. The inclined surface connects the outer side wall of the lower shaft portion (301) and one end of the vertical surface, and the other end of the vertical surface connects the outer side wall of the upper shaft portion (302); The width of the inclined surface is 0.0308 times the length of the vertical flow channel; The width of the vertical surface is 0.0186 times the length of the vertical flow channel.

9. The inner ring multi-stage stepped bevel gear web according to claim 1, wherein A plurality of straight through holes (6) arranged in a circumferential array are opened in the spoke portion (1), and a plurality of inclined through holes (7) are circumferentially arrayed on the side wall of the central shaft portion (3).

10. The inner ring multi-stage stepped bevel gear web according to any one of claims 1-9, characterized in that, The density of the material used to make the multi-stage stepped bevel gear web of the inner conical ring is less than or equal to 7.85 g / cm 3 , and the yield strength of the material used to make the bevel gear web is less than or equal to 1331 MPa.

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