A power three-branch gear transmission with an output gear that is floating

Abstract

The power three-branch gear transmission device with a floating output gear relates to the technical field of power three-branch gear transmission, and aims to solve the problems of complex structure, complicated assembly and high cost of the existing power branch gear transmission device with a torsion shaft.The application comprises a primary input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism, a secondary output mechanism and a box assembly.The output gear in the secondary output mechanism is a floating thin-wall structure, and the flexibility deformation of the floating gear and the thin-wall structure realizes the synchronism adjustment, tooth surface uniform load and shafting compensation of the power three-branch gear transmission device.The transmission components in the branch mechanism are double-tooth structures, and the required tooth machining precision and necessary tooth marking are ensured, and the marking of the input and output gears is corresponded to realize the assembly of the power three-branch gear transmission device.The application is mainly used as a transmission device in the fields of aviation, petroleum, chemical industry, natural gas industry and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power three-branch gear transmission, in particular to a power three-branch gear transmission device with floating output gear. BACKGROUND

[0002] The power branch transmission device is a special transmission structure, which has the characteristics of coaxial input and output, compactness, space saving, weight and volume optimization. The previous power branch gear transmission adopts a torsion shaft through the shaft form to connect the primary output gear and the secondary input gear through the spline or shaft coupling diaphragm assembly. This form has the characteristics of complex structure, more number of wheel train and support bearing, complex assembly process, and no obvious economic advantage. Therefore, based on the technical defects of the existing power branch gear transmission with torsion shaft, it is very practical to develop a power three-branch gear transmission device with floating output gear. SUMMARY

[0003] The present application is to solve the problems of complex structure, complicated assembly and high cost of the existing power branch gear transmission with torsion shaft. A power three-branch gear transmission device with floating output gear is provided.

[0004] A power three-branch gear transmission device with floating output gear, the transmission device comprises a primary input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism, a secondary output mechanism and a box assembly. The primary input mechanism, the first branch mechanism, the second branch mechanism, the third branch mechanism and the secondary output mechanism are arranged in the box assembly, and the primary input mechanism, the first branch mechanism, the second branch mechanism, the third branch mechanism and the secondary output mechanism are rotationally connected with the box assembly. The primary input mechanism and the secondary output mechanism are arranged at opposite ends of the box assembly, and the axis of the primary input mechanism is arranged in line with the axis of the secondary output mechanism. The first branch mechanism, the second branch mechanism and the third branch mechanism are arranged equidistantly around the primary input mechanism and the secondary output mechanism in the circumferential direction, and the primary input mechanism is drivingly connected with the secondary output mechanism through the first branch mechanism, the second branch mechanism and the third branch mechanism. The secondary output mechanism is a floating output mechanism.

[0005] Further, the primary input mechanism comprises a primary input bull gear shaft, a primary input bull gear front bearing, a primary input bull gear rear bearing and a primary input bull gear flange, the primary input bull gear shaft is inserted into one end of the box assembly, the front end of the primary input bull gear shaft is sleeved with the primary input bull gear front bearing, the rear end of the primary input bull gear shaft is sleeved with the primary input bull gear rear bearing, and the primary input bull gear shaft is rotatably connected with the box assembly through the primary input bull gear front bearing and the primary input bull gear rear bearing, the primary input bull gear shaft and the primary input bull gear flange are in a split structure, one end of the primary input bull gear shaft extends out of the box assembly and is inserted into the primary input bull gear flange located outside the box assembly, and the primary input bull gear shaft is connected with the power source through the primary input bull gear flange;

[0006] Further, the secondary output mechanism comprises a secondary output pinion shaft and a secondary output gear partition plate, the secondary output pinion shaft is a floating thin-walled structure, the secondary output pinion shaft and the secondary output gear partition plate are connected through heat baking interference, the secondary output pinion shaft and the box assembly are made of the same material and are heat treated in the same furnace;

[0007] Further, the first branch mechanism comprises a first branch shaft front bearing, a first branch shaft rear bearing and a first branch shaft, the first branch shaft is inserted into the box assembly, the front end of the first branch shaft is sleeved with the first branch shaft front bearing, the rear end of the first branch shaft is sleeved with the first branch shaft rear bearing, and the first branch shaft is rotatably connected with the box assembly through the first branch shaft front bearing and the first branch shaft rear bearing, the front end of the first branch shaft is sleeved with a first branch shaft primary pinion, the rear end of the first branch shaft is sleeved with a first branch shaft secondary bull gear, and the first branch shaft primary pinion and the first branch shaft secondary bull gear form a double-tooth structure with the first branch shaft, the first branch shaft is toothedly connected with the primary input bull gear shaft through the first branch shaft primary pinion, and the first branch shaft is toothedly connected with the secondary output pinion shaft through the first branch shaft secondary bull gear;

[0008] Further, the second branch mechanism comprises a second branch shaft front bearing, a second branch shaft rear bearing and a second branch shaft, the second branch shaft is inserted into the box assembly, the front end of the second branch shaft is sleeved with the second branch shaft front bearing, the rear end of the second branch shaft is sleeved with the second branch shaft rear bearing, and the second branch shaft is rotatably connected with the box assembly through the second branch shaft front bearing and the second branch shaft rear bearing, the front end of the second branch shaft is sleeved with a second branch shaft primary pinion, the rear end of the second branch shaft is sleeved with a second branch shaft secondary bull gear, and the second branch shaft primary pinion and the second branch shaft secondary bull gear form a double-tooth structure with the second branch shaft, the second branch shaft is toothedly connected with the primary input bull gear shaft through the second branch shaft primary pinion, and the second branch shaft is toothedly connected with the secondary output pinion shaft through the second branch shaft secondary bull gear;

[0009] Further, the third branch mechanism includes a third branch front shaft bearing, a third branch rear shaft bearing, and a third branch shaft, the third branch shaft is inserted into the box assembly, the front end of the third branch shaft is sleeved with the third branch front shaft bearing, the rear end of the third branch shaft is sleeved with the third branch rear shaft bearing, and the third branch shaft is rotatably connected with the box assembly through the third branch front shaft bearing and the third branch rear shaft bearing, the front end of the third branch shaft is sleeved with a first small gear of the third branch shaft, the rear end of the third branch shaft is sleeved with a second large gear of the third branch shaft, and the first small gear of the third branch shaft and the second large gear of the third branch shaft form a double-tooth structure with the third branch shaft, the first small gear of the third branch shaft is connected with the first input large gear shaft through gear meshing, and the second large gear of the third branch shaft is connected with the second output small gear shaft through gear meshing;

[0010] Further, the number of teeth of the gear part in the first input large gear shaft is Z1, and the number of teeth of the gear part in the second output small gear shaft is Z4, Z1 and Z4 are both integer multiples of 3;

[0011] Further, one end of the first input large gear shaft is in conical surface interference fit with the first input large gear flange;

[0012] Further, the gear part of the first input large gear shaft is machined with a hydraulic oil injection hole and an annular groove;

[0013] Further, two eddy current sensors are arranged on the side of the first input large gear front bearing for testing the vibration of the first input large gear shaft.

[0014] The beneficial effects of the present application relative to the prior art are:

[0015] 1. The power three-branch gear transmission device provided by the present application has a floating output gear, which simplifies the arrangement structure of the transmission gear and shaft system in the transmission form, combines the first small gear (first output gear) and the second large gear (second input gear) into a double-tooth structure, and eliminates the need for a torsion shaft structure connecting the first small gear and the second large gear. The previous power branch gear transmission form connects the first output gear with the second input gear through a torsion shaft, and the torsion shaft is connected with the first output gear and the second input gear through a spline or a shaft coupling diaphragm assembly, which increases the manufacturing cost and assembly difficulty of the structure.

[0016] 2. The power three-branch gear transmission device with a floating output gear reduces the number of support bearings of the branch shafts, and each of the first branch shaft, the second branch shaft and the third branch shaft needs two support bearings, totaling six support bearings. Each of the branch shafts of the previous power three-branch transmission structure needs four support bearings, totaling twelve support bearings. Therefore, the technical solution provided by the power three-branch gear transmission device greatly reduces the number of bearings of the gear transmission device, and reduces the difficulty of assembly and the manufacturing cost of the gear transmission device.

[0017] 3. The power three-branch gear transmission device with a floating output gear, wherein the second-level output pinion shaft is a floating structure without bearing support, and two support bearings are reduced compared with the previous power three-branch transmission structure. The floating structure ensures the contact of each pair of meshing gears and the synchronous adjustment of the gears. The second-level output pinion is a thin-walled structure, and the shaft system compensation is realized by deformation of the second-level output pinion. For high-speed transmission, the second-level output pinion without bearing support structure is not limited by the bottleneck ability of bearing linear velocity.

[0018] 4. The power three-branch gear transmission device with a floating output gear, wherein the total number of support bearings is eight, and the total number of support bearings of the previous power three-branch transmission structure is sixteen. The application reduces the total number of support bearings, reduces the demand for lubricating oil, improves the utilization rate of lubricating oil, and improves the efficiency of the power three-branch transmission device.

[0019] 5. The power three-branch gear transmission device with a floating output gear comprises a first input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism and a second-level output mechanism. The above structure can shorten the axial span of the gear transmission device, reduce the weight, improve the resource utilization rate, and has a compact and simple structure, and is easy to assemble, overhaul and maintain.

[0020] 6. The power three-branch gear transmission device with a floating output gear is beneficial to improve the power level, the maximum linear velocity level of the gear and the bearing load level of the transmission device, and can be applied to the fields of main machines or gearboxes for aviation, petroleum, chemical industry and natural gas industry, and has a wider range of use.

[0021] 7. The power three-branch gear transmission device with a floating output gear has the technical advantages of compact structure, high density arrangement, shortened axial size, reduced number of transmission gears and support bearings, reduced total lubricating oil amount of the transmission device, improved transmission device efficiency, improved upper limit of the allowable linear velocity value of the transmission device, and improved upper limit of the power level that can be transmitted by the transmission device. It is a new type of power three-branch transmission device structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A schematic diagram of the transmission structure of the gear transmission device described in the present application;

[0023] Figure 2 A-A view of Figure 1 ;

[0024] Figure 3 B-B view of Figure 1 ;

[0025] Figure 4 C-C view of Figure 1 ;

[0026] Figure 5 A schematic diagram of the gear engagement of the gear transmission device described in the present application;

[0027] In the figure, 1 is a primary input large gear shaft, 2 is a first branch shaft primary pinion, 3 is a second branch shaft primary pinion, 4 is a third branch shaft primary pinion, 5 is a secondary output pinion shaft, 6 is a first branch shaft secondary large gear, 7 is a second branch shaft secondary large gear, 8 is a third branch shaft secondary large gear, 9 is a primary input large gear front bearing, 10 is a primary input large gear rear bearing, 11 is a first branch shaft front bearing, 12 is a first branch shaft rear bearing, 13 is a second branch shaft front bearing, 14 is a second branch shaft rear bearing, 15 is a third branch shaft front bearing, 16 is a third branch shaft rear bearing, 17 is a first branch shaft, 18 is a second branch shaft, 19 is a third branch shaft, 20 is a secondary output gear partition plate, 21 is a primary input large gear flange, and 22 is a box assembly. DETAILED DESCRIPTION

[0028] Specific implementation one: in combination with Figures 1 to 5 In the present embodiment, a power three-branch gear transmission device is provided, in which the output gear is floating. The transmission device includes a primary input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism, a secondary output mechanism, and a box assembly 22. The primary input mechanism, the first branch mechanism, the second branch mechanism, the third branch mechanism, and the secondary output mechanism are all arranged in the box assembly 22 and are rotationally connected to the box assembly 22. The primary input mechanism and the secondary output mechanism are oppositely arranged at the two ends of the box assembly 22, and the axis of the primary input mechanism is arranged in line with the axis of the secondary output mechanism. The first branch mechanism, the second branch mechanism, and the third branch mechanism are circumferentially equidistantly arranged around the primary input mechanism and the secondary output mechanism, and the primary input mechanism is drivingly connected to the secondary output mechanism through the first branch mechanism, the second branch mechanism, and the third branch mechanism. The secondary output mechanism is a floating output mechanism.

[0029] Specific implementation two: in combination with Figures 1 to 5The difference between the embodiment and the first specific embodiment is that the first input mechanism comprises a first input bull gear shaft 1, a first input bull gear front bearing 9, a first input bull gear rear bearing 10 and a first input bull gear flange 21. The first input bull gear shaft 1 is inserted into one end of the box assembly 22, and the front end of the first input bull gear shaft 1 is sleeved with the first input bull gear front bearing 9. The rear end of the first input bull gear shaft 1 is sleeved with the first input bull gear rear bearing 10, and the first input bull gear shaft 1 is rotatably connected with the box assembly 22 through the first input bull gear front bearing 9 and the first input bull gear rear bearing 10. The first input bull gear shaft 1 and the first input bull gear flange 21 are in a split structure. One end of the first input bull gear shaft 1 extends out of the box assembly 22 and is inserted into the first input bull gear flange 21 located outside the box assembly 22. The first input bull gear shaft 1 is connected with the power source through the first input bull gear flange 21. The other components and connection modes are the same as those in the first specific embodiment.

[0030] Specific embodiment three: combination Figures 1 to 5 The difference between the embodiment and the second specific embodiment is that the second output mechanism comprises a second output pinion shaft 5 and a second output gear partition plate 20. The second output pinion shaft 5 is a floating thin-walled structure. The second output pinion shaft 5 and the second output gear partition plate 20 are connected through heat shrinkage interference. The second output pinion shaft 5 and the box assembly 22 are made of the same material and are heat treated in the same furnace. The other components and connection modes are the same as those in the second specific embodiment.

[0031] In the embodiment, the second output pinion shaft 5 and the second output gear partition plate 20 are connected through heat shrinkage interference, although no torque is transmitted, it is necessary to ensure that they are not loose. The second output pinion and the second output gear partition plate are made of the same material and are heat treated in the same furnace, so as to ensure that they have the same linear expansion coefficient and other mechanical properties. The partition plate plays a role in supporting the high-speed deformation of the second output pinion and sealing oil. The second output pinion shaft 5 and the box assembly 22 are connected in a floating manner without bearing support. Compared with the previous power three branch transmission structure, two supporting bearings are reduced. The floating structure ensures the contact of each pair of meshing gears and the synchronous adjustment of the gears. The second output pinion is a thin-walled structure, and the shaft system compensation is realized through its own deformation. For high-speed transmission, the bearing support structure of the second output pinion is not limited by the bottleneck ability of the bearing linear speed.

[0032] Specific embodiment four: combination Figures 1 to 5The embodiment is described. The embodiment is different from the third embodiment in that the first branch mechanism comprises a first branch front bearing 11, a first branch rear bearing 12 and a first branch shaft 17, the first branch shaft 17 is inserted into the box assembly 22, the front end of the first branch shaft 17 is sleeved with the first branch front bearing 11, the rear end of the first branch shaft 17 is sleeved with the first branch rear bearing 12, and the first branch shaft 17 is rotatably connected with the box assembly 22 through the first branch front bearing 11 and the first branch rear bearing 12, the front end of the first branch shaft 17 is sleeved with the first branch primary pinion 2, the rear end of the first branch shaft 17 is sleeved with the first branch secondary gear 6, and the first branch primary pinion 2 and the first branch secondary gear 6 form a double-tooth structure with the first branch shaft 17, the first branch primary pinion 2 is toothedly connected with the primary input gear shaft 1, and the first branch secondary gear 6 is toothedly connected with the secondary output pinion shaft 5. The other components and connection modes are the same as those in the third embodiment.

[0033] The fifth embodiment is described. Figures 1 to 5 The embodiment is described. The embodiment is different from the fourth embodiment in that the second branch mechanism comprises a second branch front bearing 13, a second branch rear bearing 14 and a second branch shaft 18, the second branch shaft 18 is inserted into the box assembly 22, the front end of the second branch shaft 18 is sleeved with the second branch front bearing 13, the rear end of the second branch shaft 18 is sleeved with the second branch rear bearing 14, and the second branch shaft 18 is rotatably connected with the box assembly 22 through the second branch front bearing 13 and the second branch rear bearing 14, the front end of the second branch shaft 18 is sleeved with the second branch primary pinion 3, the rear end of the second branch shaft 18 is sleeved with the second branch secondary gear 7, and the second branch primary pinion 3 and the second branch secondary gear 7 form a double-tooth structure with the second branch shaft 18, the second branch primary pinion 3 is toothedly connected with the primary input gear shaft 1, and the second branch secondary gear 7 is toothedly connected with the secondary output pinion shaft 5. The other components and connection modes are the same as those in the fourth embodiment.

[0034] The sixth embodiment is described. Figures 1 to 5The difference between the embodiment and the fourth embodiment is that the third branch mechanism comprises a third branch front bearing 15, a third branch rear bearing 16 and a third branch shaft 19, the third branch shaft 19 is arranged in the box assembly 22, the front end of the third branch shaft 19 is sleeved with the third branch front bearing 15, the rear end of the third branch shaft 19 is sleeved with the third branch rear bearing 16, the third branch shaft 19 is rotatably connected with the box assembly 22 through the third branch front bearing 15 and the third branch rear bearing 16, the front end of the third branch shaft 19 is sleeved with the third branch primary pinion 4, the rear end of the third branch shaft 19 is sleeved with the third branch secondary gear 8, the third branch primary pinion 4 and the third branch secondary gear 8 form a double-tooth structure with the third branch shaft 19, the third branch primary pinion 4 is toothedly connected with the primary input gear shaft 1, and the third branch secondary gear 8 is toothedly connected with the secondary output pinion shaft 5. The other components and connection modes are the same as those in the fifth embodiment

[0035] According to the fourth embodiment to the sixth embodiment, each branch shaft in the first branch mechanism to the third branch mechanism is supported by two sliding support bearings, i.e., a branch front bearing and a branch rear bearing. The branch front bearing is a radial sliding support bearing, and the branch rear bearing is a sliding support bearing with a thrust surface, which is used to bear the thrust of the shaft system and the positioning effect. The branch primary pinion and the branch secondary gear on each branch shaft form a double-tooth structure. For the power three-branch, the double-tooth gear needs to meet certain conditions in terms of machining accuracy. For example, for a branch shaft, two teeth on the same section of the branch primary pinion and the branch secondary gear are selected as the first reference teeth for machining. After machining, the central section error of the tooth profile of the two reference teeth is required to be ≯0.01°. After finishing, the gear pair on the branch shaft needs to be measured to meet the above angle deviation range, and then it is considered to be qualified. The commonly used method for measuring the angle of the gear pair is to use a gear detector to measure the angle of the gear pair. The same is true for the other two branches.

[0036] Double-tooth gear is a common mechanical transmission device. There are two gears on one shaft. Its advantages are that two gear shafts are combined into one shaft, and it can bear greater torque and load, has simple structure, high transmission efficiency, good reliability and stability. For the power three-branch structure, the double-tooth structure reduces the number of transmission gear shafts and sliding bearings, improves the efficiency of the transmission device and the utilization rate of lubricating oil.

[0037] The box assembly 22 in the power three-branch transmission device is mainly composed of a left bearing seat upright plate, an intermediate box and a right bearing seat upright plate. The left bearing seat upright plate, the right bearing seat upright plate and the gear transmission parts and part of the supporting bearing parts of the whole device are assembled in the form of insertion. In order to more conveniently assemble the gear transmission parts, the assembly can be performed according to the tooth alignment marks on the gear transmission parts. Taking a branch shaft in the power three-branch gear transmission device as an example, two teeth on the same section of the first-stage pinion 2 of the first branch shaft and the second-stage gear 6 of the first branch shaft are taken as the first-processed reference teeth, and tooth alignment marks are printed in the middle of the tooth profile of the two teeth. The other two branches are the same. There are three evenly distributed teeth on the gear part of the first-stage input gear shaft 1 and the gear part of the second-stage output pinion shaft 5, which are aligned with the above-mentioned reference teeth. The three two-tooth profiles of the first branch shaft 17, the second branch shaft 18 and the third branch shaft 19 can be smoothly installed in the three evenly distributed positions.

[0038] Specific embodiment seven: in combination with Figures 1 to 5 In this embodiment, the number of teeth of the gear part of the first-stage input gear shaft 1 is Z1, and the number of teeth of the gear part of the second-stage output pinion shaft 5 is Z4. Z1 and Z4 are both integer multiples of 3. The other components and connection modes are the same as those in specific embodiment six.

[0039] In this embodiment, the number of teeth of the first-stage and second-stage gears needs to meet certain tooth number relationships. Taking the first-stage and second-stage meshing gears in the first branch mechanism in the power three-branch gear transmission device as an example, the tooth number relationships of the first-stage and second-stage gears are described. The number of teeth of the gear part of the first-stage input gear shaft 1 is Z1, the number of teeth of the first-stage pinion 2 of the first branch shaft is Z2, the number of teeth of the second-stage gear 6 of the first branch shaft is Z3, and the number of teeth of the gear part of the second-stage output pinion shaft 5 is Z4. For the structure in which the three branch shafts are evenly distributed (i.e. 120°) along the circumferential direction with the first-stage input gear and the second-stage output pinion shaft line as the zero point, the number of teeth of the first-stage input gear Z1 and the number of teeth of the second-stage output pinion Z4 should be integer multiples of 3, and the number of teeth of the first-stage pinion of the first branch shaft Z2 and the number of teeth of the second-stage gear of the first branch shaft Z3 should be matched according to the specific input and output speed, center distance and other requirements. The other two branches are the same.

[0040] Specific embodiment eight: in combination with Figures 1 to 5 In this embodiment, the difference between this embodiment and specific embodiment seven is that the one end of the first-stage input gear shaft 1 is in taper interference fit with the first-stage input gear flange 21. The other components and connection modes are the same as those in specific embodiment seven.

[0041] Specific embodiment nine: in combination with Figures 1 to 5The embodiment is described, and the embodiment is different from the eighth embodiment in that the gear part of the primary input gear shaft 1 is machined with a hydraulic oil injection hole and an annular groove. The other components and connection modes are the same as those of the eighth embodiment.

[0042] The tenth embodiment is described. ​ The embodiment is described, and the embodiment is different from the ninth embodiment in that two eddy current sensors are arranged on the side of the primary input gear front bearing 9 for testing the vibration of the primary input gear shaft 1. The other components and connection modes are the same as those of the ninth embodiment.

[0043] The present application has been disclosed as above with reference to the preferred embodiments, but is not intended to limit the present application, and any person skilled in the art can make some changes or modifications to the above-mentioned disclosed structures and technical contents without departing from the scope of the technical solutions of the present application, and the equivalent embodiments with equivalent changes can be obtained. However, any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above-mentioned embodiments are still within the scope of the technical solutions of the present application.

[0044] Working principle

[0045] The output gear provided by the present application is a floating power three-branch gear transmission device in the form of two-stage three-branch external transmission. When power is transmitted to the primary input mechanism, the primary input gear shaft 1 transmits power to the first branch shaft primary pinion 2 on the first branch shaft 17, the second branch shaft primary pinion 3 on the second branch shaft 18 and the third branch shaft primary pinion 4 on the third branch shaft 19 through gear meshing, thereby forming a power three-branch. Then, the power is transmitted to the secondary output pinion shaft 5 through the first branch shaft secondary gear 6 on the first branch shaft 17, the second branch shaft secondary gear 7 on the second branch shaft 18 and the third branch shaft secondary gear 8 on the third branch shaft 19, and finally output by the secondary output mechanism. The above content is the complete power transmission route.

Claims

1. A power three-branch gear transmission device with a floating output gear, characterized in that: The transmission device includes a primary input mechanism, a No. 1 branch mechanism, a No. 2 branch mechanism, a No. 3 branch mechanism, a secondary output mechanism and a box assembly (22), wherein the primary input mechanism, the No. 1 branch mechanism, the No. 2 branch mechanism, the No. 3 branch mechanism and the secondary output mechanism are all arranged in the box assembly (22), and the primary input mechanism, the No. 1 branch mechanism, the No. 2 branch mechanism, the No. 3 branch mechanism and the secondary output mechanism are all rotatably connected to the box assembly (22), the primary input mechanism and the secondary output mechanism are relatively arranged at two ends of the box assembly (22), and the axis of the primary input mechanism and the axis of the secondary output mechanism are arranged colinearly, the No. 1 branch mechanism, the No. 2 branch mechanism and the No. 3 branch mechanism are arranged equidistantly around the primary input mechanism and the secondary output mechanism along the circumferential direction, and the primary input mechanism is transmission-connected to the secondary output mechanism through the No. 1 branch mechanism, the No. 2 branch mechanism and the No. 3 branch mechanism, and the secondary output mechanism is a floating output mechanism; The first-stage input mechanism comprises a first-stage input gear shaft (1), a first-stage input gear front bearing (9), a first-stage input gear rear bearing (10) and a first-stage input gear flange (21), the first-stage input gear shaft (1) is inserted on one end of the box assembly (22), and the front end of the first-stage input gear shaft (1) is sleeved with the first-stage input gear front bearing (9), the rear end of the first-stage input gear shaft (1) is sleeved with the first-stage input gear rear bearing (10), and the first-stage input gear shaft (1) is rotatably connected to the box assembly (22) through the first-stage input gear front bearing (9) and the first-stage input gear rear bearing (10), the first-stage input gear shaft (1) and the first-stage input gear flange (21) are split structures, one end of the first-stage input gear shaft (1) extends outside the box assembly (22) and is inserted into the first-stage input gear flange (21) located outside the box assembly (22), and the first-stage input gear shaft (1) is connected to the power source through the first-stage input gear flange (21); The secondary output mechanism comprises a secondary output pinion shaft (5) and a secondary output gear partition (20). The secondary output pinion shaft (5) is a floating thin-walled structure. The secondary output pinion shaft (5) and the secondary output gear partition (20) are interference-connected via a heat-drying sleeve. The secondary output pinion shaft (5) and the box assembly (22) are made of the same material and are heat-treated in the same furnace.

2. A power three-branch gear transmission device with a floating output gear according to claim 1, characterized in that: The No. 1 branch mechanism comprises a No. 1 branch shaft front bearing (11), a No. 1 branch shaft rear bearing (12) and a No. 1 branch shaft (17), the No. 1 branch shaft (17) is inserted into the box assembly (22), the front end of the No. 1 branch shaft (17) is fitted with the No. 1 branch shaft front bearing (11), the rear end of the No. 1 branch shaft (17) is fitted with the No. 1 branch shaft rear bearing (12), and the No. 1 branch shaft (17) is rotatably connected to the box assembly (22) through the No. 1 branch shaft front bearing (11) and the No. 1 branch shaft rear bearing (12). The front end of the first branch shaft (7) is sleeved with a first-stage pinion (2) of the first branch shaft, and the rear end of the first branch shaft (17) is sleeved with a second-stage large gear (6) of the first branch shaft, and the first-stage pinion (2) of the first branch shaft and the second-stage large gear (6) of the first branch shaft form a double-tooth structure with the first branch shaft (17), and the first branch shaft (17) is meshed with the first-stage input large gear shaft (1) through the first-stage pinion (2) of the first branch shaft, and the first branch shaft (17) is meshed with the second-stage output pinion shaft (5) through the first-stage large gear (6) of the first branch shaft.

3. The power three-branch gear transmission device with a floating output gear according to claim 2, characterized in that: The No. 2 branch mechanism includes a No. 2 branch shaft front bearing (13), a No. 2 branch shaft rear bearing (14) and a No. 2 branch shaft (18). The No. 2 branch shaft (18) is inserted into the box assembly (22). The front end of the No. 2 branch shaft (18) is provided with the No. 2 branch shaft front bearing (13), and the rear end of the No. 2 branch shaft (18) is provided with the No. 2 branch shaft rear bearing (14). The No. 2 branch shaft (18) is rotatably connected to the box assembly (22) through the No. 2 branch shaft front bearing (13) and the No. 2 branch shaft rear bearing (14). The front end of the second branch shaft (8) is provided with a first-stage pinion (3) of the second branch shaft, and the rear end of the second branch shaft (18) is provided with a second-stage large gear (7) of the second branch shaft, and the first-stage pinion (3) of the second branch shaft and the second-stage large gear (7) of the second branch shaft form a double-tooth structure with the second branch shaft (18), and the second branch shaft (18) is meshed with the first-stage input large gear shaft (1) through the first-stage pinion (3) of the second branch shaft, and the second branch shaft (18) is meshed with the second-stage output pinion shaft (5) through the second-stage large gear (7) of the second branch shaft.

4. The power three-branch gear transmission device with a floating output gear according to claim 3, characterized in that: The No. 3 branch mechanism includes a No. 3 branch shaft front bearing (15), a No. 3 branch shaft rear bearing (16) and a No. 3 branch shaft (19). The No. 3 branch shaft (19) is inserted into the box assembly (22). The front end of the No. 3 branch shaft (19) is provided with the No. 3 branch shaft front bearing (15), and the rear end of the No. 3 branch shaft (19) is provided with the No. 3 branch shaft rear bearing (16). The No. 3 branch shaft (19) is rotatably connected to the box assembly (22) through the No. 3 branch shaft front bearing (15) and the No. 3 branch shaft rear bearing (16). The No. 3 branch shaft (1 The front end sleeve of the third branch shaft (9) is provided with a first-stage pinion gear (4) of the third branch shaft, and the rear end sleeve of the third branch shaft (19) is provided with a second-stage large gear (8) of the third branch shaft, and the first-stage pinion gear (4) of the third branch shaft and the second-stage large gear (8) of the third branch shaft form a double-tooth structure with the third branch shaft (19), and the third branch shaft (19) is meshed with the first-stage input large gear shaft (1) through the first-stage pinion gear (4) of the third branch shaft, and the third branch shaft (19) is meshed with the second-stage output pinion gear shaft (5) through the second-stage large gear (8) of the third branch shaft.

5. The power three-branch gear transmission device with a floating output gear according to claim 4, characterized in that: The number of teeth of the gear portion in the first-stage input large gear shaft (1) is Z1, and the number of teeth of the gear portion in the second-stage output small gear shaft (5) is Z4, and both Z1 and Z4 are integer multiples of 3.

6. The power three-branch gear transmission device with a floating output gear according to claim 5, characterized in that: One end of the first-stage input gear shaft (1) and the first-stage input gear flange (21) are in a conical interference fit.

7. The power three-branch gear transmission device with a floating output gear according to claim 6, characterized in that: A hydraulic oil injection hole and an annular groove are machined on the gear portion of the first-stage input gear shaft (1).

8. The power three-branch gear transmission device with a floating output gear according to claim 7, characterized in that: Two eddy current sensors are provided on the side of the front bearing (9) of the first-stage input gear for testing the vibration of the first-stage input gear shaft (1).

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