Phase-adjustable combined staggered-tooth herringbone gear planetary gear train transmission

Abstract

The invention discloses a phase-adjustable combined staggered-tooth herringbone gear planetary gear train transmission. The phase-adjustable combined staggered-tooth herringbone gear planetary gear train transmission comprises a first-stage sun gear assembly, a second-stage sun gear assembly, a first-stage long planet gear assembly, a second-stage short planet gear assembly, a first-stage inner gear ring assembly, a second-stage inner gear ring assembly and a planet carrier assembly. All the gears are staggered herringbone gears; one first-stage planet gear is meshed with the first-stage sun gear and the first-stage inner gear ring, the other first-stage planet gear is meshed with the second-stage planet gear and the second-stage inner gear ring, and the second-stage planet gear is meshed with the second-stage sun gear; the first-stage sun gear assembly, the second-stage sun gear assembly and the first-stage inner gear ring assembly are different gear input ends, and the planet carrier assembly is an output end. Vibration and noise are reduced by adjusting the phase of the herringbone gear and reducing the meshing rigidity fluctuation amplitude and meshing impact in the meshing process, and the uniform load characteristic of the planetary gear train is improved through floating installation of the elastic pin shafts and the planetary gears; and the bearing capacity is high, the vibration noise is low, and the clutch is suitable for high-speed heavy-load working conditions.

Description

Technical Field

[0001] The invention belongs to the field of gear structure design and transmission design, and relates to a phase-adjustable combined staggered herringbone gear planetary gear train transmission. Background Art

[0002] Planetary gear transmissions have the characteristics of compact structure, high power-to-weight ratio and smooth transmission, and are particularly suitable for aviation, ships and engineering machinery. In recent years, with the rapid development of aviation, navigation and engineering machinery, the demand for the load-bearing capacity and vibration and noise reduction performance of planetary gear transmissions has become increasingly strong. The gears in planetary gears are usually cylindrical gears, and among cylindrical gears, the load-bearing capacity and meshing performance of herringbone gears are significantly better than other types of cylindrical gears, and are currently the focus of research and application of planetary gear gears.

[0003] The herringbone gear can be regarded as a pair of symmetrically arranged helical gears with opposite helix angles. In addition to the advantages of high load-bearing capacity and smooth transmission of helical gears, the axial forces of the helical gears at both ends can offset each other, making it widely used in the transmission system of high-speed and heavy-load equipment.

[0004] In the structure of traditional herringbone gears, the gear teeth at both ends are arranged symmetrically. Except for the opposite helix angle, the other parameters of the gear teeth at both ends are the same, that is, during the meshing process, the meshing stiffness of the gear teeth at both ends changes in the same pattern. As a result, during the meshing process, the peak-peak superposition and trough-trough superposition of the meshing stiffness curve of the gear teeth at both ends increase the stiffness fluctuation amplitude of the herringbone gear, increasing the vibration and noise during the meshing process of the herringbone gear. In addition, when the gear teeth at both ends of the herringbone gear are simultaneously involved in meshing and exiting meshing, the meshing impact will also be superimposed, further increasing the vibration and noise during the meshing process of the traditional herringbone gear. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a phase-adjustable combined staggered herringbone gear planetary gear system transmission, which can adjust the phase difference of the herringbone gears according to different operating conditions and performance requirements, reduce the meshing stiffness fluctuation, impact vibration and noise during the meshing process, and improve the load-sharing characteristics of the planetary gear system.

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

[0007] A phase-adjustable combined staggered herringbone gear planetary gear train transmission, 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 planet carrier assembly;

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

[0009] The planet carrier assembly is provided with an elastic pin shaft of a first-stage long planetary gear assembly and an elastic pin shaft of a second-stage short planetary gear assembly, which are used to support the first-stage long planetary gear assembly and the second-stage short planetary gear assembly; the first-stage sun gear connecting shaft cooperates with the front planet carrier through the first-stage sun gear connecting shaft supporting bearing, the first-stage inner gear ring connecting frame cooperates with the front planet carrier through the first-stage inner gear ring connecting frame supporting bearing, and the second-stage inner gear ring connecting frame cooperates with the rear planet carrier through the second-stage inner gear ring connecting frame supporting bearing; one first-stage planetary gear on the first-stage planetary gear connecting shaft is meshed with the first-stage sun gear and the first-stage inner gear ring at the same time, the other first-stage planetary gear is meshed with the second-stage planetary gear and the second-stage inner gear ring at the same time, and the second-stage planetary gear is meshed with the second-stage sun gear;

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

[0011] The present invention also includes the following technical features:

[0012] Specifically, the staggered herringbone gear comprises a fixed phase helical gear, a combined herringbone gear connector and an adjustable phase helical gear;

[0013] A plurality of phase adjustment holes are provided on the fixed phase helical gear and the combined herringbone gear connecting piece at the same diameter; the same number of phase adjustment holes are provided on the phase adjustment helical gear, and the distribution circle of the phase adjustment holes is the same as the distribution circle of the phase adjustment holes on the fixed phase helical gear and the combined herringbone gear connecting piece;

[0014] All the phase adjustment holes on the fixed phase helical gear and the combined herringbone gear connecting piece correspond to each other. When the phase adjustment helical gear is rotated, there is only one hole in each group of phase adjustment holes on the gear that 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 phase adjustment helical gear correspond to the phase adjustment holes on the fixed phase helical gear, different phase adjustments of the staggered herringbone gears are achieved.

[0015] Specifically, after the fixed phase helical gear, the combined herringbone gear connecting piece and the adjustable phase helical gear are combined, a high-strength hardened steel cylindrical pin is placed in the through hole of each group of phase adjustment holes, the axial symmetry plane of the high-strength hardened steel cylindrical pin coincides with the axial symmetry plane of the combined herringbone gear connecting piece, and has an interference fit with the fixed phase helical gear, the combined herringbone gear connecting piece and the adjustable phase helical gear; the high-strength high-strength hardened steel cylindrical pin can further increase the stability of the torque transmission of the staggered herringbone gear and limit the relative rotation of the gear teeth on both sides during the torque transmission process.

[0016] Specifically, the external spline on the primary sun gear connecting shaft of the primary sun gear assembly is interference fit with the internal spline on the primary sun gear;

[0017] The shaft end of the first-stage sun gear connecting shaft is provided with an external spline hollow shaft shaft end retaining ring, and the external spline hollow shaft shaft end retaining ring and the combined herringbone gear connecting piece on the first-stage sun gear are connected by a hexagon socket countersunk screw to achieve the purpose of limiting the axial displacement of the first-stage sun gear; a pair of secondary sun gear connecting shaft support bearings are placed inside the first-stage sun gear connecting shaft to support the secondary sun gear connecting shaft, and the axial displacement of the secondary sun gear connecting shaft support bearing is limited by the bearing outer ring retaining ring, the bearing inner ring retaining ring and the hole elastic retaining ring.

[0018] Specifically, a single round head flat key is placed on the power input end of the secondary sun gear connecting shaft of the secondary sun gear assembly, and the other side of the shaft end is sequentially matched with a secondary sun gear, an external spline solid shaft end retaining ring, a bearing wear-resistant retaining ring and a secondary sun gear connecting shaft end support bearing; the external spline solid shaft end retaining ring is also connected to the secondary sun gear through a hexagon socket countersunk screw, and the secondary sun gear connecting shaft end support bearing is embedded in the rear planetary carrier of the planetary carrier assembly to support the secondary sun gear connecting shaft.

[0019] Specifically, the external spline on the first-stage planetary gear connecting shaft of the first-stage long planetary gear assembly has an interference fit with the internal spline of the first-stage planetary gear; the axial position of the first-stage planetary gear on the first-stage planetary gear connecting shaft is limited by the first-stage planetary gear limit ring and the external spline hollow shaft end retaining ring.

[0020] Specifically, the first-stage planetary gear connecting shaft is a hollow shaft, and a plurality of needle bearings without inner rings are placed inside, which are interference-fitted with the first-stage planetary gear connecting shaft, and transition-fitted with the elastic pin shaft of the first-stage long planetary gear assembly, and the axial displacement of the inner ring needle bearing is limited by the hole elastic retaining ring and the outer ring retaining ring of the needle bearing;

[0021] A pair of needle roller bearings without inner rings are placed inside the secondary planetary gear, which are interference fit with the secondary planetary gear connecting shaft and transition fit with the elastic pin shaft of the secondary short planetary gear assembly, and the axial displacement of the inner ring needle roller bearing is limited by an elastic retaining ring and an outer ring retaining ring of the needle roller bearing through the hole.

[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 a connecting bolt assembly through a reamed hole, and an 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 fixing or loosening of the primary inner gear ring;

[0023] The secondary internal gear ring connecting frame and the secondary internal gear ring of the secondary internal gear ring assembly are connected by a connecting bolt assembly through a reamed hole, and an involute spur gear is cut on the secondary internal gear ring connecting frame to achieve the fixing or loosening of the secondary internal gear ring;

[0024] The parameters and structures of the primary and secondary internal gear rings are the same, and both include a phase-adjusting helical gear ring, a fixed phase helical gear ring, and a combined herringbone gear ring connector; the phase adjustment of the staggered herringbone gear ring is achieved by rotating the phase-adjusting helical gear ring;

[0025] A plurality of groups of phase adjustment holes are provided at the same diameter on the fixed phase helical gear ring and the combined herringbone gear ring connecting piece, and the same number of phase adjustment holes are provided on the adjusted phase helical gear ring, and the distribution circle of the phase adjustment holes is the same as the distribution circle of the phase adjustment holes on the fixed phase helical gear ring and the combined herringbone gear ring connecting piece; all the phase adjustment holes on the fixed phase helical gear ring and the combined herringbone gear ring connecting piece correspond one to one; when the adjusted phase helical gear ring is rotated, one and only one hole in each group of phase adjustment holes on the gear ring corresponds to the phase adjustment hole on the fixed phase helical gear ring to form a through hole.

[0026] Specifically, the connecting bolt assembly for reaming holes is composed of a hexagonal locking nut, a hexagonal head bolt for reaming holes, 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 a connecting bolt assembly through reamed holes to ensure the connection strength of the planet carrier assembly.

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

[0029] The phase-adjustable combined staggered herringbone gear planetary gear train transmission proposed in the present invention reduces the meshing stiffness fluctuation amplitude and meshing impact during the meshing process by adjusting the phase of the herringbone gears, thereby achieving the design purpose of vibration reduction and noise reduction, and further improves the load-sharing characteristics of the planetary gear train through the floating installation of elastic pins and planetary wheels.

[0030] The staggered herringbone gear planetary gear train transmission proposed by the present invention adopts a combined herringbone gear, and the gear teeth at both ends are independently processed, which reduces the processing difficulty and cost and can improve the tooth surface accuracy. The staggered herringbone gear planetary gear train transmission has smooth meshing, high load-bearing capacity, and low vibration and noise, and is particularly suitable for high-speed and heavy-load working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a schematic diagram of the appearance of a phase-adjustable combined staggered herringbone gear planetary gear train transmission of the present invention.

[0032] Figure 2 The present invention is a structural cross-sectional view of a phase-adjustable combined staggered herringbone gear planetary gear train transmission.

[0033] Figure 3 This is a schematic diagram of a combined staggered herringbone gear with zero phase difference.

[0034] Figure 4 This is the axonometric view of the combined staggered herringbone gear with zero phase difference.

[0035] Figure 5 This is a schematic diagram of the phase difference of the combined staggered herringbone gears.

[0036] Figure 6 This is an axonometric diagram of a combined staggered herringbone gear with a half-phase difference.

[0037] Figure 7 This is the axonometric view of the first-stage sun gear assembly.

[0038] Figure 8 This is an exploded view of the first-stage sun gear.

[0039] Fig. 9 This is a cross-sectional view of the first-stage sun gear.

[0040] Fig.10 This is the axonometric view of the first-stage sun gear assembly.

[0041] Fig.11 This is an axonometric view of the secondary sun gear assembly.

[0042] Fig.12 This is an exploded view of the secondary sun gear assembly.

[0043] Fig.13 This is the axonometric view of the first-stage planetary gear assembly.

[0044] Fig.14 This is an exploded view of the first-stage planetary gear assembly.

[0045] Fig.15 This is an exploded view of the secondary planetary gear assembly.

[0046] Fig.16 This is the exploded view of the inner ring gear.

[0047] Fig.17 This is an exploded view of the primary internal gear ring assembly.

[0048] Fig.18 This is an exploded view of the secondary ring gear assembly.

[0049] Fig.19 Exploded view of the planet carrier assembly.

[0050] Fig. 20 The assembly steps of the combined staggered herringbone gear planetary gear train transmission are shown in the figure. Figure 1 .

[0051] Fig.21 The assembly steps of the combined staggered herringbone gear planetary gear train transmission are shown in the figure. Figure 2 .

[0052] Fig. 22 The assembly steps of the combined staggered herringbone gear planetary gear train transmission are shown in the figure. Figure 3 .

[0053] Fig.23 The assembly steps of the combined staggered herringbone gear planetary gear train transmission are shown in the figure. Figure 4 .

[0054] Fig.24 The assembly steps of the combined staggered herringbone gear planetary gear train transmission are shown in the figure. Figure 5 .

[0055] The meaning of each number in the figure is:

[0056] 1. Secondary sun gear assembly power input end; 2. Primary sun gear assembly power input end; 3. Primary inner gear ring assembly power input end; 4. Planet carrier assembly power output end; 5. Primary sun gear assembly; 6. Primary long planetary gear assembly; 7. Primary inner gear ring assembly; 8. Secondary inner gear ring assembly; 9. Secondary short planetary gear assembly; 10. Secondary sun gear assembly; 11. Planet carrier assembly; 12. Combined herringbone gear connector; 13. Hexagon socket head screw; 14. High-strength hardened steel cylindrical pin; 15. Fixing Phase helical gear; 16. Heavy spring washer; 17-1. Ordinary solid cylindrical pin I; 17-2. Ordinary solid cylindrical pin II; 18. Adjust phase helical gear; 19. Hexagon socket set screw; 20. External spline hollow shaft end retaining ring; 21. Secondary sun gear connecting shaft support bearing; 22. Bearing outer ring retaining ring; 23. Primary sun gear connecting shaft; 24. Bearing inner ring retaining ring; 25. Primary sun gear; 26. Hexagon socket countersunk screw; 27. Shaft end single round head flat key; 28. External spline solid shaft end retaining ring; 2 9. Bearing wear-resistant retaining ring; 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 retaining ring; 35. Primary planetary gear connecting shaft; 36. Elastic retaining ring for hole; 37. Needle roller bearing outer ring retaining ring; 38. Needle roller bearing without inner ring; 39. Secondary planetary gear; 40. Adjust phase helical gear ring; 41. Fixed phase helical gear ring; 42. Combined herringbone gear ring connector; 43. Primary inner gear ring connecting frame; 44. Primary inner gear ring; 45. Hexagonal locking nut; 46. Hexagonal bolt for reaming holes; 47. Flat washer; 48. Secondary inner gear ring connecting frame; 49. Secondary inner gear ring; 50. Connecting bolt assembly for reaming holes; 51. Primary sun gear connecting shaft supporting bearing; 52. Primary inner gear ring connecting frame supporting bearing; 53. Front planet carrier; 54. Primary long planet gear assembly elastic pin; 55. Secondary short planet gear assembly elastic pin; 56. Secondary inner gear ring connecting frame supporting bearing; 57. Rear planet carrier; 58. Middle planet carrier. DETAILED DESCRIPTION

[0057] The present invention provides a phase-adjustable combined staggered herringbone gear planetary gear system 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; each gear in the transmission is a combined staggered herringbone gear structure, and the staggered tooth phase can be adjusted by rotating the phase-adjusting helical gear; the primary long planetary gear is composed of two staggered herringbone gears, which are fixedly connected by a rectangular spline to realize power transmission between the first row and the second row of planetary gear systems; in order to facilitate manufacturing, installation and power transmission, 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; the primary sun gear, the secondary sun gear and the primary inner gear ring are power input ends for different gears, and different gears can be selected The power input end, the power flow inside the planetary gear will also be different, thereby realizing power transmission with different speed ratios; the planetary carrier is always the power output end, and the power flows of different routes are finally gathered in the planetary carrier to output power; the gear ring carrier fixedly connected to the primary internal gear ring is cut with involute spur gears, which can realize the fixation, relaxation and power transmission of the primary internal gear ring; the gear ring carrier fixedly connected to the secondary internal gear ring is cut with involute spur gears, which can realize the fixation and relaxation of the secondary internal gear ring; the primary long planetary gear and the secondary short planetary gear are designed as axial floating structures and are supported by elastic pins, and the primary internal gear ring, the secondary internal gear ring, the first sun gear and the second sun gear are designed as axial fixed structures, and the planetary gears can balance the axial force of the herringbone gears due to manufacturing and installation errors during operation through a slight axial movement.

[0058] The gear teeth on both sides are designed to be staggered, and the staggered tooth phase can be adjusted according to the operating conditions. For example, when the phase is staggered by half, the peak of the meshing stiffness curve of the gear teeth on one side can be superimposed on the trough of the meshing stiffness curve of the gear teeth on the other side, which reduces the fluctuation amplitude and impact of the meshing stiffness to a certain extent, and can effectively improve the meshing characteristics of the herringbone gear pair and the load-balancing characteristics of the entire planetary gear train. Herringbone gears have the characteristics of high load-bearing capacity, smooth transmission and axial force offset. On the basis of the traditional structure of herringbone gears, changing to a staggered tooth structure can further improve its meshing characteristics. The compact planetary gear train transmission structure, high-load herringbone gear pair and staggered tooth design with better meshing performance make the staggered herringbone gear planetary gear train transmission widely matched in high-speed and heavy-load transmission systems such as aviation, ships and engineering machinery.

[0059] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0060] Embodiment 1:

[0061] like Figures 1 to 24As shown, this embodiment provides a phase-adjustable combined staggered herringbone gear planetary gear system transmission, including a first-stage sun gear assembly 5, a second-stage sun gear assembly 10, a first-stage long planetary gear assembly 6, a second-stage short planetary gear assembly 9, a first-stage inner ring gear assembly 7, a second-stage inner ring gear assembly 8, and a planetary carrier assembly 11.

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

[0063] The planet carrier assembly 11 is provided with a first-stage long planetary gear assembly elastic pin 54 and a second-stage short planetary gear assembly elastic pin 55, which are used to support the first-stage long planetary gear assembly 6 and the second-stage short planetary gear assembly 9; the first-stage sun gear connecting shaft 23 is matched with the front planet carrier 53 through the first-stage sun gear connecting shaft support bearing 51, the first-stage inner gear ring connecting frame 43 is matched with the front planet carrier 53 through the first-stage inner gear ring connecting frame support bearing 52, and the second-stage inner gear ring connecting frame 48 is matched with the rear planet carrier 57 through the second-stage inner gear ring connecting frame support bearing 56; the bearing type is selected according to the use conditions and structural dimensions. One first-stage planetary gear 33 on the first-stage planetary gear connecting shaft 35 is meshed with the first-stage sun gear 25 and the first-stage inner gear ring 44 at the same time, and the other first-stage planetary gear 33 is meshed with the second-stage planetary gear 39 and the second-stage inner gear ring 49 at the same time, and the second-stage planetary gear 39 is meshed with the second-stage sun gear 31.

[0064] The primary sun gear assembly 5, the secondary sun gear assembly 10 and the primary inner gear ring assembly 7 are input ends of different gears, and the planetary carrier assembly 11 is the output end. An external spline shaft is cut on the rear planetary carrier 57 to realize the power output of the planetary gear system. When the transmission is working in the first gear, the power is input from the power input end 1 of the secondary sun gear assembly, through the secondary sun gear 31, the secondary planetary gear 39 and the primary planetary gear 33 to the planetary carrier assembly 11, and output from the power output end 4 of the planetary carrier assembly. When the transmission is working in the second gear and reverse gear, the power is input from the power input end 1 of the primary sun gear assembly. 2 and the power input end 1 of the secondary sun gear assembly, are respectively collected to the planetary carrier assembly 11 through the primary sun gear 25, the primary planetary gear 33 and the secondary sun gear 31, and the secondary planetary gear 39, and are output from the power output end 4 of the planetary carrier assembly; when the transmission is working in the third gear, the power is input from the power input end 3 of the primary internal gear ring assembly and the power input end 1 of the secondary sun gear assembly, are respectively collected to the planetary carrier assembly 11 through the primary internal gear ring 44, the primary planetary gear 33 and the secondary sun gear 31, and the secondary planetary gear 39, and are output from the power output end 4 of the planetary carrier assembly.

[0065] The staggered herringbone gear comprises a fixed phase bevel gear 15, a combined herringbone gear connector 12 and an adjustable phase bevel gear 18; the fixed phase bevel gear 15 and the combined herringbone gear connector 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 dimensions of the gear teeth, and the number of each group of phase adjustment holes is determined by the phase adjustment range preset during design; the angle corresponding to the two phase adjustment holes on the fixed phase bevel gear 15 is the angle corresponding to a single tooth pitch of the gear; the adjustable phase bevel gear 18 is provided with the same number of phase adjustment holes, the distribution circle of the phase adjustment holes is the same as the distribution circle of the phase adjustment holes on the fixed phase bevel gear 15 and the combined herringbone gear connector 12, and the angle corresponding to the two phase adjustment holes on the adjustable phase bevel gear 18 is the sum of the angle corresponding to a single tooth pitch of the gear and the phase adjustment step.

[0066] All the phase adjustment holes on the fixed phase bevel gear 15 and the combined herringbone gear connector 12 correspond one to one. When the phase adjustment bevel gear 18 is rotated, there is only one hole in each group of phase adjustment holes on the gear that corresponds to the phase adjustment hole on the fixed phase bevel gear 15, forming a through hole. When different phase adjustment holes in each group of phase adjustment holes of the phase adjustment bevel gear 18 correspond to the phase adjustment holes on the fixed phase bevel gear 15, different phase adjustments of the herringbone gears can be achieved. After confirming the adjustment phase, the staggered herringbone gears are assembled. The fixed phase bevel gear 15, the combined herringbone gear connector 12 and the phase adjustment bevel gear 18 are interference fit. The hot-installation process is used to ensure the stable torque transmission of the staggered herringbone gears in the form of interference torque transmission, and to prevent the gear teeth on both sides from rotating relative to each other during the torque transmission process.

[0067] After the fixed phase helical gear 15, the combined herringbone gear connector 12 and the adjustable phase helical gear 18 are combined, a high-strength hardened steel cylindrical pin 14 is placed in the through hole of each set 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 connector 12, and is interference fit with the fixed phase helical gear 15, the combined herringbone gear connector 12 and the adjustable phase helical gear 18. The high-strength hardened steel cylindrical pin 14 can further increase the stability of the torque transmission of the staggered herringbone gear and limit the relative rotation of the gear teeth on both sides during the torque transmission process. An ordinary solid cylindrical pin is placed at both ends of the high-strength hardened steel cylindrical pin, which is transitionally matched with the pin hole to prevent the high-strength hardened steel cylindrical pin from having a large axial displacement. At the same time, the ordinary solid cylindrical pin is prevented from falling out by the hexagon socket set screw connected to the fixed phase helical gear and the adjustable phase helical gear.

[0068] After the fixed phase helical gear 15, the combined herringbone gear connector 12 and the phase adjustment helical gear 18 are assembled and the cylindrical pins and set screws are assembled, the fixed phase helical gear, the combined herringbone gear connector and the phase adjustment helical gear are connected by hexagon socket head screws and heavy spring washers. The stability of the torque transmission of the staggered herringbone gear is guaranteed to the greatest extent, and the relative rotation of the gear teeth on both sides during the torque transmission process is limited as much as possible.

[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 comprises a fixed phase helical gear 15, a combined herringbone gear connector 12 and an adjustable phase helical gear 18; the phase adjustment of the staggered herringbone gear is achieved by rotating the adjustable phase helical gear 18, and during the rotation process, each group of phase adjustment holes on the adjustable phase helical gear 18 has and only has one hole corresponding to the phase adjustment hole on the fixed phase helical gear 15, forming a through hole;

[0070] Figure 3 to Figure 6 The phase adjustment diagram of the combined staggered herringbone gear proposed by the present invention is shown:

[0071] like Figure 3 As shown, when hole A forms a through hole, the herringbone gear is a standard herringbone gear without phase difference;

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

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

[0074] θ1 = P t / (0.5×D f ) (1)

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

[0076] θ2 is the angle between two adjacent phase adjustment holes on the phase adjustment helical gear L:

[0077] θ2 = (1+Δθ)×θ1 (2)

[0078] Where Δθ is the phase adjustment step. In this example, the phase adjustment step is one quarter of a tooth, that is:

[0079] Δθ = 0.25×θ1 (3)

[0080] The fixed phase helical gear 15, the combined herringbone gear connector 12 and the adjustable phase helical gear 18 in the first-stage sun gear 25 are assembled in an interference fit, and a hot-installation process is adopted to ensure the stable torque transmission of the staggered herringbone gear in the form of interference torque transmission, and prevent the relative rotation of the gear teeth on both sides during the torque transmission process. After the matching is completed, a high-strength hardened steel cylindrical pin 14 is placed in the through hole of each set 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 connector 12, and is interference-fitted with the fixed phase helical gear 15, the combined herringbone gear connector 12 and the adjustable phase helical gear 18. The high-strength high-strength hardened steel cylindrical pin 14 can further increase the stability of the torque transmission of the staggered herringbone gear and limit the relative rotation of the gear teeth on both sides during the torque transmission process. An ordinary solid cylindrical pin I17-1 and an ordinary solid cylindrical pin II17-2 are placed at both ends of the high-strength hardened steel cylindrical pin 14, which are transitionally matched with the pin hole to prevent the high-strength hardened steel cylindrical pin 14 from having a large axial displacement. At the same time, the hexagon socket set screw 19 connected to the fixed phase helical gear 15 and the adjustable phase helical gear 18 prevents the ordinary solid cylindrical pin I17-1 and the ordinary solid cylindrical pin II17-2 from coming out. In addition, the fixed phase helical gear 15, the combined herringbone gear connector 12 and the adjustable phase helical gear 18 are connected by the hexagon socket cylindrical head screw 13 and the heavy spring washer 16. The stability of the torque transmission of the staggered herringbone gear is guaranteed to the greatest extent, and the relative rotation of the gear teeth on both sides during the torque transmission process is limited as much as possible.

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

[0082] The shaft end of the primary sun gear connecting shaft 23 is provided with an external spline hollow shaft shaft end retaining ring 20, which is connected to the combined herringbone gear connecting piece 12 on the primary sun gear 25 by a hexagon socket countersunk screw 26, so as 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, and the bearing type is selected according to the actual working conditions to support the secondary sun gear connecting shaft 32, and the axial displacement of the secondary sun gear connecting shaft support bearing 21 is limited by the outer ring retaining ring 22 of the bearing, the inner ring retaining ring 24 of the bearing and the elastic retaining ring 36 for the hole.

[0083] A single round head flat key 27 is placed at the power input end of the secondary sun gear connecting shaft 32 of the secondary sun gear assembly 10, and the other side of the shaft end is matched with the secondary sun gear 31, the external spline solid shaft end retaining ring 28, the bearing wear-resistant retaining ring 29 and the secondary sun gear connecting shaft end support bearing 30 in sequence; the external spline solid shaft end retaining ring 28 is also connected to the secondary sun gear 31 by the hexagon socket countersunk screw 26, and the secondary sun gear connecting shaft end support bearing 30 is selected according to the actual working conditions. The bearing type is embedded in the rear planetary carrier 57 of the planetary carrier assembly 11 to support the secondary sun gear connecting shaft 32.

[0084] In this example, there are 4 sets of first-stage long planetary gear assemblies 6, and the external splines on the first-stage planetary gear connecting shaft 35 of the first-stage long planetary gear assembly 6 are interference fit with the internal splines of the first-stage planetary gear 33; the axial position of the first-stage planetary gear 33 on the first-stage planetary gear connecting shaft 35 is limited by the first-stage planetary gear limit ring 34 and the external spline hollow shaft end retaining ring 20.

[0085] The first-stage planetary gear connecting shaft 35 is a hollow shaft, and multiple inner ring-less needle bearings 38 are placed inside. They are interference fit with the first-stage planetary gear connecting shaft 35, and also transition fit with the elastic pin shaft 54 ​​of the first-stage long planetary gear assembly. The axial displacement of the inner ring needle bearing 38 is limited by the elastic retaining ring 36 and the outer ring retaining ring 37 of the needle bearing through the hole.

[0086] In this example, there are 4 sets of secondary short planetary gear assemblies 9. A pair of inner ringless needle roller bearings 38 are placed inside the secondary planetary gear 39, which are interference fit with the secondary planetary gear connecting shaft 39 and transition fit with the elastic pin shaft 55 of the secondary short planetary gear assembly. The axial displacement of the inner ring needle roller bearing 38 is limited by the elastic retaining ring 36 and the outer ring retaining ring 37 of the needle roller bearing through the hole.

[0087] The number of the first-stage long planetary gears and the second-stage short planetary gears is the same. The number of planetary gears is set according to the torque transmission requirements and structural dimensions, and is generally 2 to 5.

[0088] The primary inner gear ring assembly 7 includes a primary inner gear ring connecting frame 43 and a primary inner gear ring 44, which are connected by a connecting bolt assembly 50 through a reamed hole. An involute spur gear is cut on the primary inner gear ring connecting frame 43 to realize the power input of the primary inner gear ring assembly 7 and the fixing or loosening of the primary inner gear ring 44.

[0089] The secondary inner gear ring assembly 8 includes a secondary inner gear ring connecting frame 48 and a secondary inner gear ring 49, which are connected by a connecting bolt assembly 50 through a reamed hole. An involute spur gear is cut on the secondary inner gear ring connecting frame 48 to achieve the fixing or loosening of the secondary inner gear ring 49.

[0090] The parameters and structures of the primary internal gear ring 44 and the secondary internal gear ring 49 are the same, and both include a phase adjustment helical gear ring 40, a fixed phase helical gear ring 41 and a combined herringbone gear ring connector 42; the phase adjustment of the staggered herringbone gear ring is achieved by rotating the phase adjustment helical gear ring 40.

[0091] A plurality of groups of phase adjustment holes are provided at the same diameter on the fixed phase helical gear ring 41 and the combined herringbone gear ring connecting piece 42, and the same number of phase adjustment holes are provided on the phase adjustment helical gear ring 40, and the distribution circle of the phase adjustment holes is the same as the distribution circle of the phase adjustment holes on the fixed phase helical gear ring 41 and the combined herringbone gear ring connecting piece 42; all the phase adjustment holes on the fixed phase helical gear ring 41 and the combined herringbone gear ring connecting piece 42 correspond one to one; when the phase adjustment helical gear ring 40 is rotated, in each group of phase adjustment holes on the gear ring, there is only one hole corresponding to the phase adjustment hole on the fixed phase helical gear ring 41, forming a through hole; the phase adjustment method and fixing method are similar to those of the above-mentioned first-stage sun gear.

[0092] The tooth adjustment structure of the inner gear ring of the cylindrical herringbone gear is similar to that of the outer cylindrical herringbone gears. The difference is that before the outer cylindrical herringbone gears are assembled in the planetary gear train, the herringbone gear phase needs to be adjusted and the parts need to be connected, while the parts of the inner gear ring of the cylindrical herringbone gear are connected by cylindrical pins and hexagon socket screws after the planetary gear train is assembled.

[0093] The connecting bolt assembly 50 for reaming a hole is composed of a hexagonal locking nut 45 , a hexagonal head reaming 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 a connecting bolt assembly 50 through reamed holes to ensure the connection strength of the planet carrier assembly 11 .

[0095] In order to ensure the load-balanced characteristics of the planetary gear system, the planetary wheels are axially floatingly installed on the planetary carrier, and the planetary pins are elastic pins; the combination of the various parts of the planetary carrier is also connected by bolts through reamed holes after the planetary gear system is assembled, so as to ensure the torsional strength of the planetary carrier.

[0096] Figure 20 to Figure 24 This is the main assembly process of the staggered herringbone gear planetary gear train transmission of the present invention. Due to the special structure of the herringbone gear, the important matching process of the planetary gear train is the assembly process of the primary internal gear ring assembly and the secondary internal gear ring assembly. The main assembly process of the planetary gear train is:

[0097] (1) Assemble the primary sun gear assembly, secondary sun gear assembly and front planet carrier;

[0098] (2) Assemble four sets of secondary short planetary gear assemblies, the middle planet carrier and the elastic pins of the secondary short planetary gear assemblies;

[0099] (3) Assembling a pair of fixed-phase helical gear rings, four sets of first-stage long planetary gear assemblies, and elastic pins of first-stage long planetary gear assemblies;

[0100] (4) Assemble the primary internal gear ring, secondary internal gear ring and rear planetary carrier;

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

[0102] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0103] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0104] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

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

2. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 1, characterized in that: The staggered herringbone gear comprises a fixed phase helical gear (15), a combined herringbone gear connecting piece (12) and a phase adjustment helical gear (18); A plurality of phase adjustment holes are provided on the fixed phase helical gear (15) and the combined herringbone gear connecting piece (12) at the same diameter; the same number of phase adjustment holes are provided on the phase adjustment helical gear (18), and the distribution circle of the phase adjustment holes is the same as the distribution circle of the phase adjustment holes on the fixed phase helical gear (15) and the combined herringbone gear connecting piece (12); All the phase adjustment holes on the fixed phase helical gear (15) and the combined herringbone gear connecting member (12) correspond to each other. When the phase adjustment helical gear (18) is rotated, one and 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 of the phase adjustment helical gear (18) correspond to the phase adjustment holes on the fixed phase helical gear (15), different phase adjustments of the staggered herringbone gears are achieved.

3. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 2, characterized in that: After the fixed phase helical gear (15), the combined herringbone gear connecting piece (12) and the adjustable phase helical gear (18) are combined, 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 interference-fitted with the fixed phase helical gear (15), the combined herringbone gear connecting piece (12) and the adjustable phase helical gear (18); the high-strength hardened steel cylindrical pin (14) can further increase the stability of the torque transmission of the staggered herringbone gear and limit the relative rotation of the gear teeth on both sides during the torque transmission process.

4. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 1, characterized in that: The external splines on the primary sun gear connecting shaft (23) of the primary sun gear assembly (5) are interference fit with the internal splines on the primary sun gear (25); The shaft end of the primary sun gear connecting shaft (23) is provided with an external spline hollow shaft shaft end retaining ring (20), and the external spline hollow shaft shaft end retaining ring (20) and the combined herringbone gear connecting piece (12) on the primary sun gear (25) are connected by a hexagon socket countersunk screw (26) to achieve the purpose of limiting 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) to support the secondary sun gear connecting shaft (32), and the axial displacement of the secondary sun gear connecting shaft support bearing (21) is limited by the bearing outer ring retaining ring (22), the bearing inner ring retaining ring (24) and the hole elastic retaining ring (36).

5. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 1, characterized in that: A single round head flat key (27) is placed at the power input end of the secondary sun gear connecting shaft (32) of the secondary sun gear assembly (10), and the other side of the shaft end is matched with a secondary sun gear (31), an external spline solid shaft end retaining ring (28), a bearing wear-resistant retaining ring (29) and a secondary sun gear connecting shaft end support bearing (30) in sequence; the external spline solid shaft end retaining ring (28) is also connected to the secondary sun gear (31) by a hexagon socket 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 gear planetary gear train transmission according to claim 1, characterized in that: The external spline on the primary planetary gear connecting shaft (35) of the primary long planetary gear assembly (6) is interference-fitted with the internal 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 retaining ring (34) and the external spline hollow shaft shaft end retaining ring (20).

7. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 6, characterized in that: The first-stage planetary gear connecting shaft (35) is a hollow shaft, and a plurality of needle roller bearings without inner rings (38) are placed inside. The first-stage planetary gear connecting shaft (35) is interference-fitted, and the first-stage long planetary gear assembly elastic pin shaft (54) is transitionally matched, and the axial displacement of the inner ring needle roller bearing (38) is limited by a hole elastic retaining ring (36) and a needle roller bearing outer ring retaining ring (37); A pair of needle roller bearings without inner rings (38) are placed inside the secondary planetary gear (39), which are interference fit with the secondary planetary gear connecting shaft (39) and transition fit with the elastic pin shaft (55) of the secondary short planetary gear assembly, and the axial displacement of the inner ring needle roller bearing (38) is limited by a hole elastic retaining ring (36) and a needle roller bearing outer ring retaining ring (37).

8. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 1, characterized in that: The primary inner gear ring connecting frame (43) and the primary inner gear ring (44) of the primary inner gear ring assembly (7) are connected by a connecting bolt assembly (50) through a reamed hole, and an involute spur gear is cut on the primary inner gear ring connecting frame (43) to realize the power input of the primary inner gear ring assembly (7) and the fixing or loosening of the primary inner gear ring (44); The secondary inner gear ring connecting frame (48) and the secondary inner gear ring (49) of the secondary inner gear ring assembly (8) are connected by a connecting bolt assembly (50) through a reamed hole, and an involute spur gear is cut on the secondary inner gear ring connecting frame (48) to achieve the fixing or loosening of the secondary inner gear ring (49); The parameters and structures of the primary inner gear ring (44) and the secondary inner gear ring (49) are the same, and both include a phase-adjusting helical gear ring (40), a fixed phase helical gear ring (41), and a combined herringbone gear ring connecting member (42); the phase of the staggered herringbone gear ring is adjusted by rotating the phase-adjusting helical gear ring (40); A plurality of groups of phase adjustment holes are provided on the fixed phase helical gear ring (41) and the combined herringbone gear ring connecting piece (42) at the same diameter, and the same number of phase adjustment holes are provided on the adjustable phase helical gear ring (40), and the distribution circle of the phase adjustment holes is the same as the distribution circle of the phase adjustment holes on the fixed phase helical gear ring (41) and the combined herringbone gear ring connecting piece (42); all the phase adjustment holes on the fixed phase helical gear ring (41) and the combined herringbone gear ring connecting piece (42) correspond one to one; when the adjustable phase helical gear ring (40) is rotated, one and only one hole in each group of phase adjustment holes on the gear ring corresponds to the phase adjustment hole on the fixed phase helical gear ring (41), forming a through hole.

9. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 8, characterized in that: The reaming hole connection bolt assembly (50) is composed of a hexagonal locking nut (45), a hexagonal head reaming hole bolt (46), a flat washer (47) and a heavy spring washer (16).

10. The phase-adjustable combined staggered herringbone gear planetary gear train transmission according to claim 9, characterized 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 a connecting bolt assembly (50) through reaming holes, thereby ensuring the connection strength of the planet carrier assembly (11).

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