A phase-adjustable combined staggered herringbone gear planetary gear train transmission

Abstract

The application discloses a phase-adjustable combined staggered herringbone gear planetary gear train transmission, which comprises a primary sun gear assembly, a secondary sun gear assembly, a primary long planetary gear assembly, a secondary short planetary gear assembly, a primary inner gear ring assembly, a secondary inner gear ring assembly and a planet carrier assembly; all the gears are staggered herringbone gears; one primary planetary gear is engaged with the primary sun gear and the primary inner gear ring, and the other primary planetary gear is engaged with the secondary planetary gear and the secondary inner gear ring; the secondary planetary gear is engaged with the secondary sun gear; the primary sun gear assembly, the secondary sun gear assembly and the primary inner gear ring assembly are different gear input ends, and the planet carrier assembly is an output end. The application reduces the amplitude of the engagement stiffness fluctuation and the engagement impact in the engagement process by adjusting the phase of the herringbone gear, reduces vibration and noise, improves the load sharing characteristics of the planetary gear train through the floating installation of the elastic pin shaft and the planetary gear, and is suitable for high-speed heavy-load working conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of gear structure design and transmission design, and relates to a combined staggered tooth herringbone gear planetary gear train transmission with adjustable phase. BACKGROUND

[0002] The planetary gear train transmission has the characteristics of compact structure, high power-to-weight ratio and smooth transmission, and is particularly suitable for the fields of aviation, ships and engineering machinery. In recent years, with the rapid development of the fields of aviation, navigation and engineering machinery, the performance requirements for the load-carrying capacity and vibration and noise reduction of the planetary gear train transmission are increasingly strong. The gears in the planetary gear train are usually cylindrical gears, and among the cylindrical gears, the load-carrying capacity and meshing performance of the herringbone gear are obviously superior to those of other types of cylindrical gears, which is the focus of the research and application of the gears in the planetary gear train.

[0003] The herringbone gear can be regarded as being symmetrically arranged by a pair of helical gears with opposite spiral angles. On the basis of having the advantages of high load-carrying capacity and smooth transmission of the helical gear, the axial forces of the two end helical gears can be offset, so that the herringbone gear can be widely applied to the transmission systems of high-speed heavy-load equipment.

[0004] In the structure of the traditional herringbone gear, the two end gear teeth are symmetrically arranged, and all other parameters of the two end gear teeth are the same except that the spiral angles are opposite, that is, the variation laws of the meshing stiffness of the two end gear teeth are consistent during the meshing process. Further, the peak-peak superposition and the valley-valley superposition of the meshing stiffness curves of the two end gear teeth during the meshing process increase the stiffness fluctuation amplitude of the herringbone gear, and increase the vibration and noise in the meshing process of the herringbone gear. In addition, the meshing impact is also superimposed during the process in which the two end gear teeth simultaneously participate in meshing and unmeshing, which further increases the vibration and noise in the meshing process of the traditional herringbone gear. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a combined staggered tooth herringbone gear planetary gear train transmission with adjustable phase, which adjusts the phase difference of the herringbone gear according to different use conditions and performance requirements, reduces the meshing stiffness fluctuation, impact vibration and noise in the meshing process, and improves the load sharing characteristics of the planetary gear train.

[0006] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0007] A combined staggered tooth herringbone gear planetary gear train transmission with adjustable phase, comprising a primary sun gear assembly, a secondary sun gear assembly, a primary long planetary gear assembly, a secondary short planetary gear assembly, a primary inner ring gear assembly, a secondary inner ring gear assembly and a carrier assembly.

[0008] The primary sun gear assembly comprises a primary sun gear connecting shaft and a primary sun gear thereon; the secondary sun gear assembly comprises a secondary sun gear connecting shaft and a secondary sun gear thereon, and the secondary sun gear connecting shaft is supported by a secondary sun gear connecting shaft support bearing in the primary sun gear connecting shaft; the primary long planetary gear assembly comprises a primary planetary gear connecting shaft and two primary planetary gears thereon; the secondary short planetary gear assembly comprises a secondary planetary gear; the primary inner ring gear assembly comprises a primary inner ring gear connecting frame and a primary inner ring gear connected thereto; the secondary inner ring gear assembly comprises a secondary inner ring gear connecting frame and a secondary inner ring gear connected thereto; all the gears are staggered herringbone gears; the planet carrier assembly comprises a front planet carrier, a middle planet carrier and a rear planet carrier connected in sequence;

[0009] The planet carrier assembly is provided with a primary long planetary gear assembly elastic pin shaft and a secondary short planetary gear assembly elastic pin shaft for supporting the primary long planetary gear assembly and the secondary short planetary gear assembly; the primary sun gear connecting shaft is matched with the front planet carrier through a primary sun gear connecting shaft support bearing, the primary inner ring gear connecting frame is matched with the front planet carrier through a primary inner ring gear connecting frame support bearing, and the secondary inner ring gear connecting frame is matched with the rear planet carrier through a secondary inner ring gear connecting frame support bearing; one of the primary planetary gears on the primary planetary gear connecting shaft is engaged with the primary sun gear and the primary inner ring gear, and the other primary planetary gear is engaged with the secondary planetary gear and the secondary inner ring gear, and the secondary planetary gear is engaged with the secondary sun gear;

[0010] The primary sun gear assembly, the secondary sun gear assembly and the primary inner ring gear assembly are input ends of different gears, and the planet carrier assembly is an output end.

[0011] The application also comprises the following technical features:

[0012] Specifically, the staggered herringbone gear comprises a fixed phase helical gear, a combined herringbone gear connecting piece and an adjustment phase helical gear.

[0013] A plurality of groups of phase adjustment holes are arranged on the same diameter of the fixed phase helical gear and the combined herringbone gear connecting piece; the adjustment phase helical gear is provided with the same number of phase adjustment holes, and the distribution circles of the phase adjustment holes are the same as those of the fixed phase helical gear and the combined herringbone gear connecting piece.

[0014] All the phase adjustment holes of the fixed phase helical gear and the combined herringbone gear connecting piece are in one-to-one correspondence, and when the adjustment phase helical gear is rotated, only one hole in each group of phase adjustment holes on the adjustment phase helical gear corresponds to the phase adjustment hole on the fixed phase helical gear to form a through hole; when different phase adjustment holes in each group of phase adjustment holes of the adjustment phase helical gear correspond to the phase adjustment holes on the fixed phase helical gear, different phase adjustments of the staggered herringbone gear are realized.

[0015] Specifically, the fixed phase helical gear, the combined herringbone gear connecting piece and the adjustment phase helical gear are combined, a high-strength quenched steel cylindrical pin is placed in the through hole of each phase adjusting hole, the axial symmetry surface of the high-strength quenched steel cylindrical pin coincides with the axial symmetry surface of the combined herringbone gear connecting piece, and the high-strength quenched steel cylindrical pin is in interference fit with the fixed phase helical gear, the combined herringbone gear connecting piece and the adjustment phase helical gear; the high-strength quenched steel cylindrical pin can further increase the stability of the staggered herringbone gear torque transmission, and limit the relative rotation of the two side gears during torque transmission.

[0016] Specifically, the outer spline on the primary sun gear connecting shaft of the primary sun gear assembly is in interference fit with the inner spline on the primary sun gear.

[0017] The outer spline hollow shaft end stop ring is arranged at the shaft end of the primary sun gear connecting shaft, the combined herringbone gear connecting piece on the primary sun gear is connected to the outer spline hollow shaft end stop ring through the internal hexagon countersunk head screw, and the axial displacement of the primary sun gear is limited; a pair of secondary sun gear connecting shaft support bearings are arranged in the primary sun gear connecting shaft, the secondary sun gear connecting shaft is supported by the secondary sun gear connecting shaft support bearings, and the axial displacement of the secondary sun gear connecting shaft support bearings is limited by the bearing outer ring stop ring, the bearing inner ring stop ring and the hole elastic stop ring.

[0018] Specifically, the power input end of the secondary sun gear connecting shaft of the secondary sun gear assembly is provided with a shaft end single round head flat key, the other shaft end is sequentially provided with a secondary sun gear, an outer spline solid shaft end stop ring, a bearing wear-resistant stop ring and a secondary sun gear connecting shaft end support bearing; the outer spline solid shaft end stop ring is also connected to the secondary sun gear through the internal hexagon countersunk head screw, and the secondary sun gear connecting shaft end support bearing is embedded in the rear planet carrier of the planet carrier assembly to support the secondary sun gear connecting shaft.

[0019] Specifically, the outer spline on the primary sun gear connecting shaft of the primary sun gear assembly is in interference fit with the inner spline on the primary sun gear.

[0020] Specifically, the primary sun gear connecting shaft is a hollow shaft, a plurality of inner ringless needle roller bearings are arranged in the primary sun gear connecting shaft, the primary sun gear connecting shaft is in interference fit with the primary sun gear, the primary sun gear connecting shaft is in transition fit with the primary long planet gear assembly elastic pin shaft, and the axial displacement of the inner ringless needle roller bearings is limited by the hole elastic stop ring and the needle roller bearing outer ring stop ring.

[0021] The secondary planet gear is internally provided with a pair of inner ringless needle roller bearings, the secondary planet gear connecting shaft is in interference fit with the secondary planet gear, the secondary planet gear connecting shaft is in transition fit with the secondary short planet gear assembly elastic pin shaft, and the axial displacement of the inner ringless needle roller bearings is limited by the hole elastic stop ring and the needle roller bearing outer ring stop ring.

[0022] Specifically, the primary inner gear ring connecting frame and the primary inner gear ring of the primary inner gear ring assembly are connected by the connecting bolt assembly with the hinge hole, and the involute spur gear is cut on the primary inner gear ring connecting frame to realize the power input of the primary inner gear ring assembly and the fixation or loosening of the primary inner gear ring.

[0023] The secondary inner gear ring connecting frame and the secondary inner gear ring of the secondary inner gear ring assembly are connected by the connecting bolt assembly with the hinge hole, and the involute spur gear is cut on the secondary inner gear ring connecting frame to realize the fixation or loosening of the secondary inner gear ring.

[0024] The parameters and structures of the primary inner gear ring and the secondary inner gear ring are the same, and both include the adjustment phase helical gear, the fixed phase helical gear and the combined herringbone gear connecting piece; the phase adjustment of the staggered herringbone gear is realized by rotating the adjustment phase helical gear.

[0025] On the fixed phase helical gear and the combined herringbone gear connecting piece, a plurality of phase adjustment holes are arranged at the same diameter, and the adjustment phase helical gear is provided with the same number of phase adjustment holes, the distribution circles of the phase adjustment holes are the same as those of the phase adjustment holes on the fixed phase helical gear and the combined herringbone gear connecting piece; all the phase adjustment holes on the fixed phase helical gear and the combined herringbone gear connecting piece are one-to-one corresponding; when the adjustment phase helical gear is rotated, only one hole in each group of phase adjustment holes on the adjustment phase helical gear corresponds to the phase adjustment hole on the fixed phase helical gear, forming a through hole.

[0026] Specifically, the connecting bolt assembly with the hinge hole is composed of a hexagonal locking nut, a hexagonal head bolt with a hinge hole, a flat washer and a heavy spring washer.

[0027] Specifically, the front planet carrier, the middle planet carrier and the rear planet carrier of the planet carrier assembly are connected by the connecting bolt assembly with the hinge hole, so as to ensure the connection strength of the planet carrier assembly.

[0028] Compared with the prior art, the present application has the following technical effects:

[0029] The phase-adjustable combined staggered herringbone gear planetary gear train transmission device can reduce the meshing stiffness fluctuation amplitude and meshing impact in the meshing process by adjusting the phase of the herringbone gear, so as to achieve the design purpose of vibration and noise reduction, and the uniform load characteristics of the planetary gear train are further improved by the floating installation of the elastic pin shaft and the planet carrier.

[0030] The staggered herringbone gear planetary gear train transmission device adopts the combined herringbone gears, the teeth at both ends are independently machined, the machining difficulty and cost are reduced, and the tooth surface precision is improved. The staggered herringbone gear planetary gear train transmission device has the advantages of stable meshing, high bearing capacity and low vibration and noise, and is especially suitable for high-speed and heavy-load working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Figure 1 is a perspective view of a phase adjustable combined staggered double helical gear planetary gear train transmission of the present invention.

[0032] Figure 2 Figure 2 is a cross sectional view of the phase adjustable combined staggered double helical gear planetary gear train transmission of the present invention.

[0033] Figure 3 Figure 3 is a schematic view of the combined staggered double helical gear zero phase difference.

[0034] Figure 4 Figure 4 is an isometric view of the combined staggered double helical gear zero phase difference.

[0035] Figure 5 Figure 5 is a schematic view of the combined staggered double helical gear one-half phase difference.

[0036] Figure 6 Figure 6 is an isometric view of the combined staggered double helical gear one-half phase difference.

[0037] Figure 7 Figure 7 is an isometric view of a primary sun gear assembly.

[0038] Figure 8 Figure 8 is an exploded view of a primary sun gear.

[0039] Figure 9 Figure 9 is a cross sectional view of a primary sun gear.

[0040] Figure 10 Figure 10 is an isometric view of a primary sun gear assembly.

[0041] Figure 11 Figure 11 is an isometric view of a secondary sun gear assembly.

[0042] Figure 12 Figure 12 is an exploded view of a secondary sun gear assembly.

[0043] Figure 13 Figure 13 is an isometric view of a primary planetary gear assembly.

[0044] Figure 14 Figure 14 is an exploded view of a primary planetary gear assembly.

[0045] Figure 15 Figure 15 is an exploded view of a secondary planetary gear assembly.

[0046] Figure 16 Figure 16 is an exploded view of an inner ring.

[0047] Figure 17 Figure 17 is an exploded view of a primary inner ring assembly.

[0048] Figure 18 Figure 18 is an exploded view of a secondary inner ring assembly.

[0049] Figure 19 Exploded view of planetary carrier assembly.

[0050] Figure 20 Assembly step schematic for a combined staggered double helical planetary gear train transmission Figure 1 .

[0051] Figure 21 Assembly step schematic for a combined staggered double helical planetary gear train transmission Figure 2 .

[0052] Figure 22 Assembly step schematic for a combined staggered double helical planetary gear train transmission Figure 3 .

[0053] Figure 23 Assembly step schematic for a combined staggered double helical planetary gear train transmission Figure 4 .

[0054] Figure 24 Assembly step schematic for a combined staggered double helical planetary gear train transmission Figure 5 .

[0055] The meaning of the various reference numbers in the figures is as follows:

[0056] 1. Secondary sun gear assembly power input; 2. Primary sun gear assembly power input; 3. Primary inner ring assembly power input; 4. Carrier assembly power output; 5. Primary sun gear assembly; 6. Primary long planetary gear assembly; 7. Primary inner ring assembly; 8. Secondary inner ring assembly; 9. Secondary short planetary gear assembly; 10. Secondary sun gear assembly; 11. Carrier assembly; 12. Split double helical gear connector; 13. Hexagon socket head cap screw; 14. High strength quenched steel cylindrical pin; 15. Fixed phased helical gear; 16. Heavy spring washer; 17-1. Regular solid cylindrical pin I; 17-2. Regular solid cylindrical pin II; 18. Adjusted phased helical gear; 19. Hexagon socket set screw; 20. External spline hollow shaft end collar; 21. Secondary sun gear connecting shaft support bearing; 22. Bearing outer race retainer; 23. Primary sun gear connecting shaft; 24. Bearing inner race retainer; 25. Primary sun gear; 26. Hexagon socket countersunk head screw; 27. Shaft end single round head flat key; 28. External spline solid shaft end collar; 29. Bearing wear resistant retainer; 30. Secondary sun gear connecting shaft end support bearing; 31. Secondary sun gear; 32. Secondary sun gear connecting shaft; 33. Primary planetary gear; 34. Primary planetary gear limit stop retainer; 35. Primary planetary gear connecting shaft; 36. Hole elastic retainer; 37. Needle roller bearing outer race retainer; 38. Needle roller bearing without inner race; 39. Secondary planetary gear; 40. Adjusted phased helical ring; 41. Fixed phased helical ring; 42. Split double helical ring connector; 43. Primary inner ring connecting bracket; 44. Primary inner ring; 45. Hexagon lock nut; 46. Hexagon head bolt for hinged hole; 47. Flat washer; 48. Secondary inner ring connecting bracket; 49. Secondary inner ring; 50. Connecting bolt assembly for hinged hole; 51. Primary sun gear connecting shaft support bearing; 52. Primary inner ring connecting bracket support bearing; 53. Front carrier; 54. Primary long planetary gear assembly elastic pin shaft; 55. Secondary short planetary gear assembly elastic pin shaft; 56. Secondary inner ring connecting bracket support bearing; 57. Rear carrier; 58. Middle carrier. DETAILED DESCRIPTION

[0057] The application provides a phase-adjustable combined staggered herringbone gear planetary gear train transmission, which mainly comprises a primary sun gear, a secondary sun gear, a primary long planetary gear, a secondary short planetary gear, a primary inner gear ring, a secondary inner gear ring and a planetary carrier assembly; all gears in the transmission are combined staggered herringbone gears, and the staggered phase can be adjusted by rotating the phase helical gear; the primary long planetary gear is composed of two staggered herringbone gears and is fixed by a rectangular spline to realize power transmission between the first planetary gear train and the second planetary gear train; the planetary carrier is designed as a planetary carrier assembly composed of a front planetary carrier, a middle planetary carrier and a rear planetary carrier to facilitate manufacturing, installation and power transmission; the primary sun gear, the secondary sun gear and the primary inner gear ring are power input ends of different gears, the power flow in the planetary gear is different when different power input ends are selected, and thus power transmission with different speed ratios is realized; the planetary carrier is always a power output end, and the power flow of different routes is finally collected to the planetary carrier to output power; the gear ring carrier fixed with the primary inner gear ring is cut with a involute spur gear to realize fixation, loosening and power transmission of the primary inner gear ring; the gear ring carrier fixed with the secondary inner gear ring is cut with a involute spur gear to realize fixation and loosening of the secondary inner gear ring; the primary long planetary gear and the secondary short planetary gear are designed as an axial floating structure and are supported by elastic pins, and the primary inner gear ring, the secondary inner gear ring, the first sun gear and the second sun gear are designed as an axial fixed structure, so that the planetary gear can slightly axially move to balance the axial force of the herringbone gear caused by manufacturing and installation errors during operation.

[0058] The two side gears are designed as staggered gears, and the staggered phase can be adjusted according to the working conditions; for example, when the staggered phase is designed as one-half, the peak of the meshing stiffness curve of one side gear can be superimposed with the valley of the meshing stiffness curve of the other side gear, the fluctuation amplitude and impact of the meshing stiffness are reduced to a certain extent, the meshing characteristics of the herringbone gear pair and the load sharing characteristics of the entire planetary gear train are effectively improved. The herringbone gear has the characteristics of high bearing capacity, stable transmission and axial force offset, and on the basis of the traditional structure of the herringbone gear, the staggered structure is changed, and the meshing characteristics are further improved. The compact planetary gear train transmission structure, the high-bearing herringbone gear pair and the better meshing performance of the staggered design make the staggered herringbone gear planetary gear train transmission can be widely matched in high-speed and heavy-load transmission systems such as aviation, ships and engineering machinery.

[0059] The following gives specific embodiments of the application, and it should be noted that the application is not limited to the following specific embodiments, and any equivalent variations made on the basis of the technical solutions of the application fall within the protection scope of the application.

[0060] Example 1:

[0061] As Figures 1 to 24As shown, the embodiment provides a phase-adjustable combined staggered double-helical gear planetary gear train transmission, which comprises a first sun gear assembly 5, a second sun gear assembly 10, a first long planetary gear assembly 6, a second short planetary gear assembly 9, a first inner ring gear assembly 7, a second inner ring gear assembly 8, and a planetary carrier assembly 11.

[0062] The first sun gear assembly 5 comprises a first sun gear connecting shaft 23 and a first sun gear 25 thereon; the second sun gear assembly 10 comprises a second sun gear connecting shaft 32 and a second sun gear 31 thereon, and the second sun gear connecting shaft 32 is supported by a second sun gear connecting shaft support bearing 21 in the first sun gear connecting shaft 23; the first long planetary gear assembly 6 comprises a first planetary gear connecting shaft 35 and two first planetary gears 33 thereon; the second short planetary gear assembly 9 comprises a second planetary gear 39; the first inner ring gear assembly 7 comprises a first inner ring gear connecting carrier 43 and a first inner ring gear 44 connected thereto; the second inner ring gear assembly 8 comprises a second inner ring gear connecting carrier 48 and a second inner ring gear 49 connected thereto; all gears are staggered double-helical gears; and the planetary carrier assembly 11 comprises a front planetary carrier 53, a middle planetary carrier 58, and a rear planetary carrier 57 connected in sequence.

[0063] The planetary carrier assembly 11 is provided with a first long planetary gear assembly elastic pin shaft 54 and a second short planetary gear assembly elastic pin shaft 55 for supporting the first long planetary gear assembly 6 and the second short planetary gear assembly 9; the first sun gear connecting shaft 23 is matched with the front planetary carrier 53 through a first sun gear connecting shaft support bearing 51, the first inner ring gear connecting carrier 43 is matched with the front planetary carrier 53 through a first inner ring gear connecting carrier support bearing 52, and the second inner ring gear connecting carrier 48 is matched with the rear planetary carrier 57 through a second inner ring gear connecting carrier support bearing 56; the bearing type is selected according to the working condition and structural size. One of the first planetary gears 33 on the first planetary gear connecting shaft 35 is engaged with the first sun gear 25 and the first inner ring gear 44 at the same time, the other first planetary gear 33 is engaged with the second planetary gear 39 and the second inner ring gear 49 at the same time, and the second planetary gear 39 is engaged with the second sun gear 31.

[0064] The first-stage sun gear assembly 5, the second-stage sun gear assembly 10 and the first-stage inner ring assembly 7 are input ends of different gears, the planet carrier assembly 11 is an output end, an outer spline shaft is cut on the rear planet carrier 57 to realize power output of the planetary gear train; when the transmission is in the first gear, power is input from the second-stage sun gear assembly power input end 1, and is output from the planet carrier assembly power output end 4 through the second-stage sun gear 31, the second-stage planet gear 39 and the first-stage planet gear 33; when the transmission is in the second gear and the reverse gear, power is input from the first-stage sun gear assembly power input end 2 and the second-stage sun gear assembly power input end 1, and is output from the planet carrier assembly power output end 4 through the first-stage sun gear 25, the first-stage planet gear 33 and the second-stage sun gear 31, the second-stage planet gear 39; when the transmission is in the third gear, power is input from the first-stage inner ring assembly power input end 3 and the second-stage sun gear assembly power input end 1, and is output from the planet carrier assembly power output end 4 through the first-stage inner ring 44, the first-stage planet gear 33 and the second-stage sun gear 31, the second-stage planet gear 39.

[0065] The staggered double helical gear comprises a fixed phase helical gear 15, a combined double helical gear connecting piece 12 and an adjustment phase helical gear 18; the fixed phase helical gear 15 and the combined double helical gear connecting piece 12 are provided with a plurality of groups of phase adjustment holes at the same diameter, the number of groups of phase adjustment holes is determined by the structural size of the gear tooth, and the number of each group of phase adjustment holes is determined by the preset phase adjustment range in design; the included angle of two phase adjustment holes on the fixed phase helical gear 15 corresponds to the included angle of a single tooth pitch of the gear; the adjustment phase helical gear 18 is provided with the same number of phase adjustment holes, the distribution circle of the phase adjustment holes is the same as that of the phase adjustment holes on the fixed phase helical gear 15 and the combined double helical gear connecting piece 12, and the included angle of two phase adjustment holes on the adjustment phase helical gear 18 corresponds to the sum of the included angle of a single tooth pitch of the gear and the phase adjustment step.

[0066] All the phase adjustment holes on the fixed phase helical gear 15 and the combined double helical gear connecting piece 12 correspond to each other, when the adjustment phase helical gear 18 is rotated, only one hole in each group of phase adjustment holes on the gear corresponds to the phase adjustment hole on the fixed phase helical gear 15 to form a through hole; when different phase adjustment holes in each group of phase adjustment holes on the adjustment phase helical gear 18 correspond to the phase adjustment holes on the fixed phase helical gear 15, different phase adjustments of the double helical gear can be realized. After the adjustment phase is confirmed, the assembly of the staggered double helical gear is carried out, the fixed phase helical gear 15, the combined double helical gear connecting piece 12 and the adjustment phase helical gear 18 are in interference fit, the hot assembly process is adopted in the form of interference torque to ensure the stable transmission of the staggered double helical gear and prevent the relative rotation of the two side gear teeth during the transmission.

[0067] After the fixed-phase helical gear 15, the combined herringbone gear connector 12, and the adjusting-phase helical gear 18 are assembled, a high-strength hardened steel cylindrical pin 14 is placed in the through hole of each set of phase adjustment holes. The axial symmetry plane of the high-strength hardened steel cylindrical pin 14 coincides with the axial symmetry plane of the combined herringbone gear connector 12, and is interference-fitted with the fixed-phase helical gear 15, the combined herringbone gear connector 12, and the adjusting-phase helical gear 18. The high-strength hardened steel cylindrical pin 14 can further increase the stability of torque transmission of the staggered herringbone gear and limit the relative rotation of the teeth on both sides during torque transmission. A plain solid cylindrical pin is placed at both ends of the high-strength hardened steel cylindrical pin, which transitionally fits with the pin hole to prevent large axial displacement of the high-strength hardened steel cylindrical pin. At the same time, the plain solid cylindrical pin is prevented from falling out by the internal hexagon set screws connected to the fixed-phase helical gear and the adjusting-phase helical gear.

[0068] After the fixed-phase helical gear 15, the combined herringbone gear connector 12, and the adjusting-phase helical gear 18 are assembled and fitted with cylindrical pins and set screws, the fixed-phase helical gear, the combined herringbone gear connector, and the adjusting-phase helical gear are connected using internal hexagonal head screws and heavy-duty spring washers. This maximizes the stability of torque transmission of the staggered herringbone gear while minimizing the relative rotation of the teeth on both sides during torque transmission.

[0069] The external spline on the primary sun gear connecting shaft 23 of the primary sun gear assembly 5 is interference-fitted with the internal spline on the primary sun gear 25; the primary sun gear 25 includes a fixed phase helical gear 15, a combined herringbone gear connector 12, and an adjusting phase helical gear 18; the phase adjustment of the misaligned herringbone gear is achieved by rotating the adjusting phase helical gear 18. During the rotation, each set of phase adjustment holes on the adjusting phase helical gear 18 has one and only one hole corresponding to the phase adjustment hole on the fixed phase helical gear 15, forming a through hole;

[0070] Figures 3 to 6 This invention illustrates the phase adjustment of the combined staggered herringbone gear:

[0071] like Figure 3 As shown, when hole A forms a through hole, the herringbone gear is a standard herringbone gear with no phase difference;

[0072] like Figure 5 As shown, when hole B forms a through hole, the herringbone gear is a herringbone gear with half a tooth offset.

[0073] θ1 is the included angle between two adjacent phase adjustment holes on the fixed-phase helical gear R:

[0074] θ1 = P t / (0.5×D f (1)

[0075] wherein P t is the face pitch, D f is the distribution circle diameter of the adjustment holes.

[0076] θ2 is the included angle of the two adjacent phase adjustment holes on the phase-adjusted helical gear L:

[0077] θ2 = (1+Δθ)×θ1 (2)

[0078] wherein Δθ is the phase adjustment step, in the present example, the phase adjustment step is one quarter of a tooth, i.e.

[0079] Δθ = 0.25×θ1 (3)

[0080] The assembly of the fixed phase helical gear 15, the combined herringbone gear connecting piece 12 and the phase-adjusted helical gear 18 in the primary sun gear 25 is an interference fit, and a hot assembly process is used to ensure the stable transmission of the staggered herringbone gear and prevent the relative rotation of the two side gears during the transmission process. After the assembly is completed, a high-strength hardened steel cylindrical pin 14 is placed in the through hole of each group of phase adjustment holes, the axial symmetry surface of the high-strength hardened steel cylindrical pin 14 coincides with the axial symmetry surface of the combined herringbone gear connecting piece 12, and is in interference fit with the fixed phase helical gear 15, the combined herringbone gear connecting piece 12 and the phase-adjusted helical gear 18. The high-strength high-strength hardened steel cylindrical pin 14 can further increase the stability of the staggered herringbone gear transmission and limit the relative rotation of the two side gears during the transmission process. A common solid cylindrical pin I 17-1 and a common solid cylindrical pin II 17-2 are placed at both ends of the high-strength hardened steel cylindrical pin 14, which are in transition fit with the pin hole to prevent the high-strength hardened steel cylindrical pin 14 from having a large axial displacement. At the same time, through the internal hexagonal set screw 19 connected to the fixed phase helical gear 15 and the phase-adjusted helical gear 18, the common solid cylindrical pin I 17-1 and the common solid cylindrical pin II 17-2 are prevented from being pulled out. In addition, the fixed phase helical gear 15, the combined herringbone gear connecting piece 12 and the phase-adjusted helical gear 18 are connected through the internal hexagonal cylindrical head screw 13 and the heavy spring washer 16. The stability of the staggered herringbone gear transmission is ensured to the greatest extent, and the relative rotation of the two side gears during the transmission process is limited as much as possible.

[0081] The phase adjustment and structural fixation of all staggered herringbone gears in the staggered herringbone gear planetary gear train of the present application are the same as or similar to the primary sun gear assembly 25.

[0082] The shaft end of the primary sun gear connecting shaft 23 is provided with an outer spline hollow shaft end retainer 20. The outer spline hollow shaft end retainer 20 is connected to the combined herringbone gear connecting piece 12 on the primary sun gear 25 through a hexagonal socket head screw 26 to limit the axial displacement of the primary sun gear 25. A pair of secondary sun gear connecting shaft support bearings 21 are placed inside the primary sun gear connecting shaft 23. The type of bearing is selected according to the actual working condition to support the secondary sun gear connecting shaft 32. The axial displacement of the secondary sun gear connecting shaft support bearings 21 is limited by the bearing outer ring retainer 22, the bearing inner ring retainer 24 and the hole elastic retainer 36.

[0083] The power input end of the secondary sun gear connecting shaft 32 of the secondary sun gear assembly 10 is placed with a shaft end single round head flat key 27. The other side shaft end is sequentially matched with a secondary sun gear 31, an outer spline solid shaft end retainer 28, a bearing wear-resistant retainer 29 and a secondary sun gear connecting shaft end support bearing 30. The outer spline solid shaft end retainer 28 is also connected to the secondary sun gear 31 through a hexagonal socket head screw 26. The type of the secondary sun gear connecting shaft end support bearing 30 is selected according to the actual working condition. The secondary sun gear connecting shaft 32 is supported by being embedded in the rear planetary carrier 57 of the planetary carrier assembly 11.

[0084] The primary long planetary gear assembly 6 in the present example is 4 groups. The outer spline on the primary planetary gear connecting shaft 35 is interference fit with the inner spline of the primary planetary gear 33. The axial position of the primary planetary gear 33 on the primary planetary gear connecting shaft 35 is limited by the primary planetary gear limiting retainer 34 and the outer spline hollow shaft end retainer 20.

[0085] The primary planetary gear connecting shaft 35 is a hollow shaft. A plurality of inner ringless needle bearings 38 are placed inside the primary planetary gear connecting shaft 35. The inner ringless needle bearings 38 are interference fit with the primary planetary gear connecting shaft 35, transition fit with the primary long planetary gear assembly elastic pin shaft 54, and the axial displacement of the inner ringless needle bearings 38 is limited by the hole elastic retainer 36 and the needle bearing outer ring retainer 37.

[0086] The secondary short planetary gear assembly 9 in the present example is 4 groups. The secondary planetary gear 39 is internally placed with a pair of inner ringless needle bearings 38, which are interference fit with the secondary planetary gear connecting shaft 39, transition fit with the secondary short planetary gear assembly elastic pin shaft 55, and the axial displacement of the inner ringless needle bearings 38 is limited by the hole elastic retainer 36 and the needle bearing outer ring retainer 37.

[0087] The number of primary long planetary gears and secondary short planetary gears is the same. The number of planetary gears is set according to the torque demand and structural size, and is generally 2-5.

[0088] The primary inner ring assembly 7 includes a primary inner ring connecting frame 43 and a primary inner ring 44, which are connected by the hinge hole connecting bolt assembly 50. The primary inner ring connecting frame 43 is provided with involute spur gears to realize power input of the primary inner ring assembly 7 and fixation or loosening of the primary inner ring 44.

[0089] The secondary inner ring assembly 8 includes a secondary inner ring connecting frame 48 and a secondary inner ring 49, which are connected by the hinge hole connecting bolt assembly 50. The secondary inner ring connecting frame 48 is provided with involute spur gears to realize fixation or loosening of the secondary inner ring 49.

[0090] The primary inner ring 44 and the secondary inner ring 49 have the same parameters and structures, and each includes an adjustment phase helical gear 40, a fixed phase helical gear 41 and a combined herringbone gear connecting piece 42. The phase adjustment of the herringbone gear is realized by rotating the adjustment phase helical gear 40.

[0091] At the same diameter, a plurality of phase adjustment holes are arranged on the fixed phase helical gear 41 and the combined herringbone gear connecting piece 42. The adjustment phase helical gear 40 is provided with the same number of phase adjustment holes. The distribution circles of the phase adjustment holes are the same as those of the phase adjustment holes on the fixed phase helical gear 41 and the combined herringbone gear connecting piece 42. All the phase adjustment holes on the fixed phase helical gear 41 and the combined herringbone gear connecting piece 42 are in one-to-one correspondence. When the adjustment phase helical gear 40 is rotated, only one hole in each group of phase adjustment holes on the adjustment phase helical gear 40 corresponds to the phase adjustment hole on the fixed phase helical gear 41, forming a through hole. The phase adjustment mode and the fixation mode are similar to those of the primary sun gear.

[0092] The herringbone gear phase adjustment structure of the cylindrical herringbone gear inner ring is similar to that of each outer cylindrical herringbone gear. The difference is that each outer cylindrical herringbone gear needs to be adjusted in phase and connected with each part before the planetary gear train is assembled, while each part of the cylindrical herringbone gear inner ring is connected by the cylindrical pin and the internal hexagonal screw after the planetary gear train is assembled.

[0093] The hinge hole connecting bolt assembly 50 is composed of a hexagonal lock nut 45, a hexagonal head hinge hole bolt 46, a flat washer 47 and a heavy spring washer 16.

[0094] The front planet carrier 53, the middle planet carrier 58 and the rear planet carrier 57 of the planet carrier assembly 11 are connected by the hinge hole connecting bolt assembly 50 to ensure the connection strength of the planet carrier assembly 11.

[0095] To ensure the load sharing characteristics of the planetary gear train, the planetary gears are axially floatingly installed on the planet carrier, and the planet pin shafts are elastic pin shafts. The planet carrier parts are also connected by the hinge hole connecting bolt after the planetary gear train is assembled, so as to ensure the torque strength of the planet carrier.

[0096] Figures 20 to 24 The main assembly process of the staggered double helical gear planetary gear train transmission of the present application, due to the special structure of the double helical gear, the important matching process of the planetary gear train is the assembly process of the first level inner gear ring assembly and the second level inner gear ring assembly, the main assembly process of the planetary gear train is:

[0097] (1) Assemble the first level sun gear assembly, the second level sun gear assembly and the front planet carrier.

[0098] (2) Assemble four groups of second level short planet gear assemblies, the middle planet carrier and the second level short planet gear assembly elastic pin shaft.

[0099] (3) Assemble a pair of fixed phase helical gears, four groups of first level long planet gear assemblies and first level long planet gear assembly elastic pin shafts.

[0100] (4) Assemble the first level inner gear ring, the second level inner gear ring and the rear planet carrier.

[0101] (5) Complete the assembly of the entire planetary gear train.

[0102] The preferred embodiments of the present application are described in detail above in combination with the drawings, however, the present application is not limited to the specific details in the above described embodiments, within the technical concept range of the present application, the technical solutions of the present application can be subjected to various simple modifications, and these simple modifications all belong to the protection range of the present application.

[0103] In addition, it should be noted that each specific technical feature described in the above described specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present application will not further describe various possible combination manners.

[0104] Furthermore, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the technical concept of the present application, it should also be considered as the disclosed content of the present application.

Claims

1. A phase-adjustable combined staggered herringbone planetary gear train transmission, characterized in that, The gear box comprises a primary sun gear assembly (5), a secondary sun gear assembly (10), a primary long planetary gear assembly (6), a secondary short planetary gear assembly (9), a primary inner ring gear assembly (7), a secondary inner ring gear assembly (8), and a planetary carrier assembly (11); The primary sun gear assembly (5) comprises a primary sun gear connecting shaft (23) and a primary sun gear (25) arranged on the primary sun gear connecting shaft (23); the secondary sun gear assembly (10) comprises a secondary sun gear connecting shaft (32) and a secondary sun gear (31) arranged on the secondary sun gear connecting shaft (32), and the secondary sun gear connecting shaft (32) is supported by a secondary sun gear connecting shaft support bearing (21) arranged in the primary sun gear connecting shaft (23); the primary long planetary gear assembly (6) comprises a primary planetary gear connecting shaft (35) and two primary planetary gears (33) arranged on the primary planetary gear connecting shaft (35); the secondary short planetary gear assembly (9) comprises a secondary planetary gear (39); the primary inner ring gear assembly (7) comprises a primary inner ring gear connecting frame (43) and a primary inner ring gear (44) connected to the primary inner ring gear connecting frame (43); the secondary inner ring gear assembly (8) comprises a secondary inner ring gear connecting frame (48) and a secondary inner ring gear (49) connected to the secondary inner ring gear connecting frame (48); all the gears are staggered herringbone gears; the planetary carrier assembly (11) comprises a front planetary carrier (53), a middle planetary carrier (58), and a rear planetary carrier (57) connected in sequence; The primary long planetary gear assembly elastic pin shaft (54) and the secondary short planetary gear assembly elastic pin shaft (55) are arranged on the planetary carrier assembly (11) and used for supporting the primary long planetary gear assembly (6) and the secondary short planetary gear assembly (9); the primary sun gear connecting shaft (23) is matched with the front planetary carrier (53) through a primary sun gear connecting shaft support bearing (51), the primary inner ring gear connecting frame (43) is matched with the front planetary carrier (53) through a primary inner ring gear connecting frame support bearing (52), and the secondary inner ring gear connecting frame (48) is matched with the rear planetary carrier (57) through a secondary inner ring gear connecting frame support bearing (56); one of the primary planetary gears (33) on the primary planetary gear connecting shaft (35) is engaged with the primary sun gear (25) and the primary inner ring gear (44) at the same time, the other primary planetary gear (33) is engaged with the secondary planetary gear (39) and the secondary inner ring gear (49) at the same time, and the secondary planetary gear (39) is engaged with the secondary sun gear (31); The primary sun gear assembly (5), the secondary sun gear assembly (10), and the primary inner ring gear assembly (7) are input ends of different gears, and the planetary carrier assembly (11) is an output end.

2. The phase adjustable combined staggered herringbone planetary gear train transmission of claim 1 wherein, The staggered herringbone gears comprise fixed phase helical gears (15), combined herringbone gear connecting pieces (12), and adjustment phase helical gears (18); A plurality of groups of phase adjustment holes are arranged on the fixed phase helical gears (15) and the combined herringbone gear connecting pieces (12) at the same diameter; the adjustment phase helical gears (18) are provided with the same number of phase adjustment holes, and the distribution circles of the phase adjustment holes are the same as those of the phase adjustment holes on the fixed phase helical gears (15) and the combined herringbone gear connecting pieces (12); The fixed phase helical gear (15) and the combined herringbone gear connecting piece (12) are correspondingly provided with phase adjustment holes, and when the phase adjustment helical gear (18) is rotated, only one of the phase adjustment holes in each group of phase adjustment holes of the phase adjustment helical gear (18) corresponds to the phase adjustment hole of the fixed phase helical gear (15), thereby forming a through hole; when different phase adjustment holes in each group of phase adjustment holes of the phase adjustment helical gear (18) correspond to the phase adjustment hole of the fixed phase helical gear (15), different phase adjustments of the staggered herringbone gear are realized.

3. A phase adjustable combined staggered herringbone planetary gear train transmission according to claim 2, characterised in that, The fixed phase helical gear (15), the combined herringbone gear connecting piece (12) and the phase adjustment helical gear (18) are combined, and a high-strength quenched steel cylindrical pin (14) is arranged in the through hole of each group of phase adjustment holes, the axial symmetry surface of the high-strength quenched steel cylindrical pin (14) coincides with the axial symmetry surface of the combined herringbone gear connecting piece (12), and the high-strength quenched steel cylindrical pin (14) is in interference fit with the fixed phase helical gear (15), the combined herringbone gear connecting piece (12) and the phase adjustment helical gear (18); the high-strength quenched steel cylindrical pin (14) can further increase the stability of the staggered herringbone gear in torque transmission and limit the relative rotation of the two side gears during torque transmission.

4. The phase adjustable combined staggered herringbone planetary gear train transmission of claim 1 wherein, The outer spline on the primary sun gear connecting shaft (23) of the primary sun gear assembly (5) is in interference fit with the inner spline on the primary sun gear (25); The outer spline hollow shaft end stop ring (20) is arranged at the shaft end of the primary sun gear connecting shaft (23), and the combined herringbone gear connecting piece (12) on the primary sun gear (25) is connected to the outer spline hollow shaft end stop ring (20) through the internal hexagon countersunk screw (26), so that the axial displacement of the primary sun gear (25) is limited; a pair of secondary sun gear connecting shaft support bearings (21) are arranged in the primary sun gear connecting shaft (23), for supporting the secondary sun gear connecting shaft (32), and the axial displacement of the secondary sun gear connecting shaft support bearings (21) is limited by the bearing outer ring stop ring (22), the bearing inner ring stop ring (24) and the hole elastic stop ring (36).

5. The phase adjustable combined staggered herringbone planetary gear train transmission of claim 1 wherein, The power input end of the secondary sun gear connecting shaft (32) of the secondary sun gear assembly (10) is provided with a shaft end single round head flat key (27), and the other shaft end is sequentially matched with the secondary sun gear (31), the outer spline solid shaft end stop ring (28), the bearing wear-resistant stop ring (29) and the secondary sun gear connecting shaft end support bearing (30); the outer spline solid shaft end stop ring (28) is also connected to the secondary sun gear (31) through the internal hexagon countersunk screw (26), and the secondary sun gear connecting shaft end support bearing (30) is embedded in the rear planetary carrier (57) of the planetary carrier assembly (11) to support the secondary sun gear connecting shaft (32).

6. The phase adjustable combined staggered herringbone planetary gear train transmission of claim 1 wherein, The outer spline on the primary planetary gear connecting shaft (35) of the primary long planetary gear assembly (6) is in interference fit with the inner spline of the primary planetary gear (33); the axial position of the primary planetary gear (33) on the primary planetary gear connecting shaft (35) is limited by the primary planetary gear limiting stop ring (34) and the outer spline hollow shaft end stop ring (20).

7. A phase adjustable combined staggered herringbone planetary gear train transmission as claimed in claim 6 wherein, The primary planetary wheel connecting shaft (35) is a hollow shaft, inside which a plurality of inner-ring-free needle roller bearings (38) are placed, which are in interference fit with the primary planetary wheel connecting shaft (35) and also in transition fit with the primary long planetary wheel assembly elastic pin shaft (54), and the axial displacement of the inner-ring-free needle roller bearings (38) is limited by the hole elastic check ring (36) and the needle roller bearing outer ring check ring (37); The secondary planetary wheel (39) has a pair of inner-ring-free needle roller bearings (38) placed inside, which are in interference fit with the secondary planetary wheel connecting shaft (39) and also in transition fit with the secondary short planetary wheel assembly elastic pin shaft (55), and the axial displacement of the inner-ring-free needle roller bearings (38) is limited by the hole elastic check ring (36) and the needle roller bearing outer ring check ring (37).

8. The phase adjustable combined staggered herringbone planetary gear train transmission of claim 1 wherein, The primary inner tooth ring connecting frame (43) and the primary inner tooth ring (44) of the primary inner tooth ring assembly (7) are connected by the hinged hole connecting bolt assembly (50), and the primary inner tooth ring connecting frame (43) is cut with a involute spur gear to realize the power input of the primary inner tooth ring assembly (7) and the fixation or loosening of the primary inner tooth ring (44); The secondary inner tooth ring connecting frame (48) and the secondary inner tooth ring (49) of the secondary inner tooth ring assembly (8) are connected by the hinged hole connecting bolt assembly (50), and the secondary inner tooth ring connecting frame (48) is cut with a involute spur gear to realize the fixation or loosening of the secondary inner tooth ring (49); The parameters and structures of the primary inner tooth ring (44) and the secondary inner tooth ring (49) are the same, and both include the adjustment phase helical gear (40), the fixed phase helical gear (41) and the combined herringbone gear connecting piece (42); the phase adjustment of the staggered herringbone gear is realized by rotating the adjustment phase helical gear (40); On the same diameter of the fixed phase helical gear (41) and the combined herringbone gear connecting piece (42), a plurality of phase adjustment holes are provided, and the adjustment phase helical gear (40) is provided with the same number of phase adjustment holes, and the distribution circle of the phase adjustment holes is the same as that of the phase adjustment holes on the fixed phase helical gear (41) and the combined herringbone gear connecting piece (42); all the phase adjustment holes on the fixed phase helical gear (41) and the combined herringbone gear connecting piece (42) are one-to-one corresponding; when the adjustment phase helical gear (40) is rotated, only one hole in each group of phase adjustment holes on the gear corresponds to the phase adjustment hole on the fixed phase helical gear (41), forming a through hole.

9. A phase adjustable combined staggered herringbone planetary gear train transmission as claimed in claim 8, characterised in that, The hinged hole connecting bolt assembly (50) is composed of a hexagonal lock nut (45), a hexagonal head hinged hole bolt (46), a flat washer (47) and a heavy spring washer (16).

10. A phase adjustable combined staggered herringbone planetary gear train transmission as claimed in claim 9, characterised in that, The front planet carrier (53), the middle planet carrier (58) and the rear planet carrier (57) of the planet carrier assembly (11) are connected by the hinged hole connecting bolt assembly (50), which ensures the connection strength of the planet carrier assembly (11).

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