Power three-branch gear transmission device with floating output gear

Abstract

The invention discloses a power three-branch gear transmission device with a floating type output gear, relates to the technical field of power three-branch gear transmission, and aims at solving the problems that an existing power three-branch gear transmission device with a torsion shaft is complex in structure, tedious to assemble and high in manufacturing cost. The floating-type thin-wall-structure gear box comprises a first-stage input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism, a second-stage output mechanism and a box body assembly, and an output gear in the second-stage output mechanism is of a floating-type thin-wall structure; synchronous adjustment, gear tooth surface uniform load and shafting compensation of the power three-branch transmission device are achieved through flexible deformation of the floating gear and the thin-wall structure. A transmission part in the branch mechanism is of a duplex gear structure, certain required tooth alignment machining precision and necessary tooth alignment lineation marks need to be ensured, and assembly of the power three-branch transmission device is achieved corresponding to lineation marks of an input gear and an output gear. The transmission device is mainly used in the fields of aviation, petroleum, chemical engineering, natural gas industry and the like.

Description

Technical Field

[0001] The invention relates to the technical field of power three-branch gear transmission, and in particular to a power three-branch gear transmission device with a floating output gear. Background Art

[0002] As a special transmission structure, the power branch transmission device is characterized by coaxial input and output, compactness, space saving, and relatively optimized weight and volume. In the past, the power branch gear transmission form was that the first-stage output gear and the second-stage input gear were connected by a through-shaft torque shaft through a spline or a coupling diaphragm assembly. This form has the characteristics of complex structure, a large number of gear trains and supporting bearings, a relatively complex assembly process, and no obvious economic advantages. Therefore, based on the technical defects of the existing power branch gear transmission structure with a torque shaft, it is very in line with practical needs to develop a power three-branch gear transmission device with a floating output gear. Summary of the invention

[0003] The present invention aims to solve the problems of complex structure, complicated assembly and high cost of the existing power branch gear transmission device with a torque shaft; and further provides a power three-branch gear transmission device with a floating output gear;

[0004] A power three-branch gear transmission device with a floating output gear, the transmission device comprises a primary input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism, a second output mechanism and a box assembly, the primary input mechanism, the first branch mechanism, the second branch mechanism, the third branch mechanism and the second output mechanism are all arranged in the box assembly, and the primary input mechanism, the first branch mechanism, the second branch mechanism, the third branch mechanism and the second output mechanism are all rotatably connected with the box assembly, the primary input mechanism and the second output mechanism are relatively arranged at two ends of the box assembly, and the axis of the primary input mechanism and the axis of the second output mechanism are arranged colinearly, the first branch mechanism, the second branch mechanism and the third branch mechanism are arranged equidistantly around the primary input mechanism and the second output mechanism along the circumferential direction, and the primary input mechanism is transmission-connected with the second output mechanism through the first branch mechanism, the second branch mechanism and the third branch mechanism, and the second output mechanism is a floating output mechanism;

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

[0006] Furthermore, the secondary output mechanism includes 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 interference-connected through a heat-drying sleeve, and the secondary output pinion shaft and the box assembly are made of the same material and are heat-treated in the same furnace;

[0007] Furthermore, the No. 1 branch mechanism includes a No. 1 branch shaft front bearing, a No. 1 branch shaft rear bearing and a No. 1 branch shaft, the No. 1 branch shaft is inserted in the box assembly, the front end of the No. 1 branch shaft is sleeved with the No. 1 branch shaft front bearing, the rear end of the No. 1 branch shaft is sleeved with the No. 1 branch shaft rear bearing, and the No. 1 branch shaft is rotatably connected with the box assembly through the No. 1 branch shaft front bearing and the No. 1 branch shaft rear bearing, the front end of the No. 1 branch shaft is sleeved with a No. 1 branch shaft first-stage pinion, the rear end of the No. 1 branch shaft is sleeved with a No. 1 branch shaft second-stage gear, and the No. 1 branch shaft first-stage pinion and the No. 1 branch shaft second-stage gear form a double-tooth structure with the No. 1 branch shaft, the No. 1 branch shaft is meshed with the first-stage input gear shaft teeth through the No. 1 branch shaft first-stage pinion, and the No. 1 branch shaft is meshed with the second-stage output pinion shaft teeth through the No. 1 branch shaft second-stage gear;

[0008] Furthermore, the No. 2 branch mechanism includes a No. 2 branch shaft front bearing, a No. 2 branch shaft rear bearing and a No. 2 branch shaft, the No. 2 branch shaft is inserted in the box assembly, the front end of the No. 2 branch shaft is sleeved with the No. 2 branch shaft front bearing, the rear end of the No. 2 branch shaft is sleeved with the No. 2 branch shaft rear bearing, and the No. 2 branch shaft is rotatably connected with the box assembly through the No. 2 branch shaft front bearing and the No. 2 branch shaft rear bearing, the front end of the No. 2 branch shaft is sleeved with a No. 2 branch shaft first-stage pinion, the rear end of the No. 2 branch shaft is sleeved with a No. 2 branch shaft second-stage large gear, and the No. 2 branch shaft first-stage pinion and the No. 2 branch shaft second-stage large gear form a double-tooth structure with the No. 2 branch shaft, the No. 2 branch shaft is meshed and connected with the first-stage input large gear shaft teeth through the No. 2 branch shaft first-stage pinion, and the No. 2 branch shaft is meshed and connected with the second-stage output pinion shaft teeth through the No. 2 branch shaft second-stage large gear;

[0009] Furthermore, the No. 3 branch mechanism includes a No. 3 branch shaft front bearing, a No. 3 branch shaft rear bearing and a No. 3 branch shaft, the No. 3 branch shaft is inserted in the box assembly, the front end of the No. 3 branch shaft is sleeved with the No. 3 branch shaft front bearing, the rear end of the No. 3 branch shaft is sleeved with the No. 3 branch shaft rear bearing, and the No. 3 branch shaft is rotatably connected with the box assembly through the No. 3 branch shaft front bearing and the No. 3 branch shaft rear bearing, the front end of the No. 3 branch shaft is sleeved with a No. 3 branch shaft first-stage pinion, the rear end of the No. 3 branch shaft is sleeved with a No. 3 branch shaft second-stage gear, and the No. 3 branch shaft first-stage pinion and the No. 3 branch shaft second-stage gear form a double-tooth structure with the No. 3 branch shaft, the No. 3 branch shaft is meshed with the first-stage input gear shaft teeth through the No. 3 branch shaft first-stage pinion, and the No. 3 branch shaft is meshed with the second-stage output pinion shaft teeth through the No. 3 branch shaft second-stage gear;

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

[0011] Furthermore, one end of the first-stage input gear shaft is in a conical interference fit with the first-stage input gear flange;

[0012] Furthermore, a hydraulic oil injection hole and an annular groove are machined on the gear portion of the first-stage input gear shaft;

[0013] Furthermore, two eddy current sensors are arranged on the front bearing side of the first-stage input gearwheel for testing the vibration of the first-stage input gearwheel shaft.

[0014] The beneficial effects of this application compared to the prior art are as follows:

[0015] 1. The present application provides a power three-branch gear transmission device with a floating output gear. Compared with the traditional power branch gear transmission structure with a torsion shaft, the arrangement structure of the transmission gear and the shaft system is simplified in the transmission form, and the primary pinion (primary output gear) and the secondary gear (secondary input gear) are combined into one to form a double-tooth structure, without the need to set a torsion shaft structure for connecting the primary pinion and the secondary gear. In the previous power branch gear transmission form, the primary output gear is connected to the secondary input gear through a torsion shaft, and the torsion shaft is connected to the primary output gear and the secondary input gear through a spline or a coupling diaphragm assembly, which increases the manufacturing cost and assembly difficulty of the structure;

[0016] 2. The present application provides a power three-branch gear transmission device with a floating output gear, which reduces the number of supporting bearings of the branch shafts. Branch shaft No. 1, branch shaft No. 2, and branch shaft No. 3 each require 2 supporting bearings, for a total of 6. The previous power three-branch transmission structure required 4 supporting bearings for each branch shaft, for a total of 12. It can be seen that the technical solution provided by the present application greatly reduces the number of bearings in the gear transmission device, and reduces the difficulty of matching and the manufacturing cost of the gear transmission device.

[0017] 3. The present application provides a power three-branch gear transmission device with a floating output gear, wherein the secondary output pinion shaft is a floating structure without bearing support, which reduces 2 supporting bearings compared with the previous power three-branch transmission structure, and the floating structure ensures the contact of each pair of meshing gears and the synchronous adjustment of the gears; the secondary output pinion is a thin-walled structure, which realizes shaft system compensation through its own deformation; for high-speed transmission, the secondary output pinion has no bearing support structure and is not limited by the bearing linear speed bottleneck capacity.

[0018] 4. The present application provides a power three-branch gear transmission device in which the output gear is a floating type, and the supply and demand supporting bearings total 8. In the past, the power three-branch transmission structure required a total of 16 supporting bearings. The present invention reduces the total number of supporting 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 present application provides a power three-branch gear transmission device with a floating output gear, including a primary input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism and a secondary output mechanism. The above structural arrangement can shorten the axial span of the gear transmission device, reduce weight, improve resource utilization, and has a compact and simple structure, and is easy to assemble, inspect and maintain.

[0020] 6. The present application provides a power three-branch gear transmission device with a floating output gear, which is beneficial to improving the power level of the transmission device, the maximum linear speed level of the gear and the bearing load level. It can be applied to the fields of aviation, petroleum, chemical industry, natural gas industry main engine or gearbox, and has a wider range of applications.

[0021] 7. The present application provides a power three-branch gear transmission device with a floating output gear, which has the technical advantages of compact structure, high-density layout, shortened axial size, and reduced number of transmission gears and supporting bearings. It also reduces the total amount of lubricating oil in the transmission device, improves the efficiency of the transmission device, increases the upper limit of the allowable linear speed value of the transmission device, and increases the 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 THE DRAWINGS

[0022] Figure 1 This is a simplified diagram of the transmission structure of the gear transmission device described in this application;

[0023] Figure 2 for Figure 1 AA view;

[0024] Figure 3 for Figure 1 BB direction view;

[0025] Figure 4 for Figure 1 CC view;

[0026] Figure 5 A schematic diagram of the meshing of gears of the gear transmission device described in this application;

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

[0028] Specific implementation method 1: Combination Figures 1 to 5 The present embodiment is described. In the present embodiment, a power three-branch gear transmission device having a floating output gear is provided. 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 the primary input mechanism, the first branch mechanism, the second branch mechanism, the third 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 is colinearly arranged with the axis of the secondary output mechanism. The first branch mechanism, the second branch mechanism and the third branch mechanism are equidistantly arranged 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 first branch mechanism, the second branch mechanism and the third branch mechanism, and the secondary output mechanism is a floating output mechanism.

[0029] Specific implementation method 2: Combination Figures 1 to 5This embodiment is described. The difference between this embodiment and the first embodiment is that the first-stage input mechanism includes 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 provided with the first-stage input gear front bearing 9, and the rear end of the first-stage input gear shaft 1 is provided with the first-stage input gear rear bearing 10. 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 separate 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. The first-stage input gear shaft 1 is connected to the power source through the first-stage input gear flange 21. Other components and connection methods are the same as those of the first embodiment.

[0030] Specific implementation method three: Combination Figures 1 to 5 This embodiment is described. The difference between this embodiment and the second embodiment is that the secondary output mechanism includes 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 connected by interference fit through 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. Other components and connection methods are the same as those of the second embodiment.

[0031] In this embodiment, the secondary output pinion shaft 5 and the secondary output gear partition 20 are connected by interference fit through a heat-drying sleeve. Although no torque is transmitted, it is necessary to ensure that they are not loose. The secondary output pinion and the secondary output pinion partition are made of the same material and heat-treated in the same furnace to ensure that they have the same mechanical properties such as linear expansion coefficient. The partition plays the role of supporting the high-speed deformation of the secondary output pinion and sealing the oil; the secondary output pinion shaft 5 and the box assembly 22 are floatingly connected without bearing support, which reduces 2 supporting bearings 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 secondary output pinion is a thin-walled structure, which realizes shaft system compensation through its own deformation; for high-speed transmission, the secondary output pinion has no bearing support structure and is not limited by the linear speed bottleneck capacity of the bearing.

[0032] Specific implementation method four: Combination Figures 1 to 5The present embodiment is described. The present embodiment is different from the specific embodiment 3 in that the No. 1 branch mechanism includes 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 equipped with the No. 1 branch shaft front bearing 11, and the rear end of the No. 1 branch shaft 17 is equipped with the No. 1 branch shaft rear bearing 12. The No. 1 branch shaft 17 is connected to the box assembly 22 through the No. 1 branch shaft front bearing 11 and the No. 1 branch shaft rear bearing 12. 2 is rotatably connected, the front end of the No. 1 branch shaft 17 is sleeved with the No. 1 branch shaft primary pinion 2, the rear end of the No. 1 branch shaft 17 is sleeved with the No. 1 branch shaft secondary gear 6, and the No. 1 branch shaft primary pinion 2 and the No. 1 branch shaft secondary gear 6 form a double-tooth structure with the No. 1 branch shaft 17, the No. 1 branch shaft 17 is meshed with the primary input gear shaft 1 through the No. 1 branch shaft primary pinion 2, and the No. 1 branch shaft 17 is meshed with the secondary output pinion shaft 5 through the No. 1 branch shaft secondary gear 6. Other components and connection methods are the same as those of the specific embodiment 3.

[0033] Specific implementation method five: Combination Figures 1 to 5 The present embodiment is described. The present embodiment is different from the specific embodiment 4 in that the second branch mechanism includes a second branch shaft front bearing 13, a second branch shaft 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 provided with the second branch shaft front bearing 13, and the rear end of the second branch shaft 18 is provided with the second branch shaft rear bearing 14. The second branch shaft 18 is connected to the box assembly 22 through the second branch shaft front bearing 13 and the second branch shaft rear bearing 14. 2 is rotatably connected, the front end of the second branch shaft 18 is sleeved with the first-stage pinion 3 of the second branch shaft, the rear end of the second branch shaft 18 is sleeved with the 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, 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. Other components and connection methods are the same as those of the fourth specific embodiment.

[0034] Specific implementation method six: Combination Figures 1 to 5The present embodiment is described. The present embodiment is different from the specific embodiment 4 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 connected to the box assembly 22 through the No. 3 branch shaft front bearing 15 and the No. 3 branch shaft rear bearing 16. 2 is rotatably connected, the front end of the third branch shaft 19 is sleeved with the first-stage pinion gear 4 of the third branch shaft, the rear end of the third branch shaft 19 is sleeved with the 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, 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. Other components and connection methods are the same as those of the specific embodiment 5

[0035] Combined with the description of Specific Embodiments 4 to 6, each branch shaft in the branch structure No. 1 to branch structure No. 3 is supported by two sliding support bearings, namely the front bearing of the branch shaft and the rear bearing of the branch shaft, wherein the front bearing of the branch shaft is a radial sliding support bearing, and the rear bearing of the branch shaft is a sliding support bearing with a thrust surface, which is used to bear the thrust of the shaft system and the positioning function. The first-level pinion of the branch shaft and the second-level gear of the branch shaft on each branch shaft are double-tooth structures. For the three-power branch, the machining accuracy of the double-tooth gear needs to meet certain conditions, that is, taking a branch shaft as an example: two teeth located on the same cross section on the first-level pinion of the branch shaft and the second-level gear of the branch shaft are selected as the first reference teeth to be processed. After processing, the section error of the middle of the tooth profile of the two reference teeth is required to be ≯0.01°. After fine processing, the gear pairs on the branch shaft need to be measured. They can only be considered qualified if they meet the above-mentioned angle deviation range. The commonly used method for measuring the tooth angle is to measure the tooth angle with a gear tester, and the same is true for the other two branches;

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

[0037] The housing assembly 22 in the power three-branch transmission device is mainly composed of a left bearing seat vertical plate, an intermediate housing and a right bearing seat vertical plate. The left bearing seat vertical plate, the right bearing seat vertical plate and the gear transmission components and some supporting bearing components of the entire device are assembled by plug-in. In order to facilitate the assembly of the gear transmission parts, they can be assembled 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, the two teeth on the same cross section of the first branch shaft pinion 2 and the second branch shaft large gear position 6 are used as the first reference teeth to be processed, and the tooth alignment marks are printed in the middle of the tooth profiles of these two teeth. The other two branches are similar. There are three evenly distributed teeth on the gear part of the first input large gear shaft 1 and the gear part of the second output pinion shaft 5, which are aligned with the above-mentioned reference teeth. The first branch shaft 17, the second branch shaft 18 and the third branch shaft 19 corresponding to the three tooth profiles can be smoothly installed in the three evenly distributed positions.

[0038] Specific implementation method seven: Combination Figures 1 to 5 This embodiment is described. The difference between this embodiment and the sixth embodiment is that the number of teeth of the gear part in the primary input gear shaft 1 is Z1, and the number of teeth of the gear part in the secondary output pinion shaft 5 is Z4, and both Z1 and Z4 are integer multiples of 3. The other components and connection methods are the same as those in the sixth embodiment.

[0039] In this embodiment, the number of teeth of the primary and secondary gears needs to meet a certain relationship of the number of teeth. Taking the primary and secondary meshing gears in the No. 1 branch mechanism in the power three-branch gear transmission device as an example, the relationship of the number of teeth of the primary and secondary gears is explained. The number of teeth of the gear part in the primary input gear shaft 1 is Z1, the number of teeth of the primary pinion 2 of the No. 1 branch shaft is Z2, the number of teeth of the secondary gear 6 of the No. 1 branch shaft is Z3, and the number of teeth of the gear part in the secondary output pinion shaft 5 is Z4. Among them, for the structure in which the three branch shafts are evenly distributed along the circumferential direction (i.e. 120°) with the zero point directly above the axis of the primary input gear and the secondary output pinion, the number of teeth of the primary input gear is Z1 and the number of teeth of the secondary output pinion is Z4, which should be an integer multiple of the number 3, the number of teeth of the primary pinion of the No. 1 branch shaft is Z2 and the number of teeth of the secondary gear of the No. 1 branch shaft is Z3, and the number of teeth should be matched according to the specific input and output speeds, center distance and other requirements. The same applies to the other two branches.

[0040] Specific implementation method eight: Combination Figures 1 to 5 This embodiment is described. The difference between this embodiment and the seventh embodiment is that one end of the primary input gear shaft 1 is in a conical interference fit with the primary input gear flange 21. The other components and connection methods are the same as those of the seventh embodiment.

[0041] Specific implementation method nine: Combination Figures 1 to 5This embodiment is described. The difference between this embodiment and the eighth embodiment is that a hydraulic oil injection hole and an annular groove are processed on the gear portion of the first-stage input gear shaft 1. The other components and connection methods are the same as those of the eighth embodiment.

[0042] Specific implementation method ten: Combination Figures 1 to 5 This embodiment is described. The difference between this embodiment and the ninth embodiment is that two eddy current sensors are provided on the side of the first-stage input gear front bearing 9 to test the vibration of the first-stage input gear shaft 1. The other components and connection methods are the same as those of the ninth embodiment.

[0043] The present invention has been disclosed as above with preferred implementation cases, but it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0044] How it works

[0045] The present application provides a power three-branch gear transmission device with a floating output gear, which is a two-stage three-branch external transmission form. When the power is transmitted to the first-stage input mechanism, the first-stage input large gear shaft 1 transmits the power to the first branch shaft first-stage pinion 2 on the No. 1 branch shaft 17, the second branch shaft first-stage pinion 3 on the No. 2 branch shaft 18, and the third branch shaft first-stage pinion 4 on the No. 3 branch shaft 19 through gear meshing, forming a power three-branch, and then the power is transmitted to the second-stage output pinion shaft 5 through the No. 1 branch shaft second-stage large gear 6 on the No. 1 branch shaft 17, the No. 2 branch shaft second-stage large gear 7 on the No. 2 branch shaft 18, and the No. 3 branch shaft second-stage large gear 8 on the No. 3 branch shaft 19, and finally the power is output by the second-stage output mechanism. The above content is a complete power transmission route.

Claims

1. A power three-branch gear transmission device with a floating output gear, characterized in that: The transmission device comprises a primary input mechanism, a first branch mechanism, a second branch mechanism, a third branch mechanism, a second 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 second output mechanism are all arranged in the box assembly (22); the primary input mechanism, the first branch mechanism, the second branch mechanism, the third branch mechanism and the second output mechanism are all rotatably connected to the box assembly (22); the primary input mechanism and the second output mechanism are relatively arranged at two ends of the box assembly (22); the axis of the primary input mechanism and the axis of the second output mechanism are arranged colinearly; the first branch mechanism, the second branch mechanism and the third branch mechanism are arranged equidistantly around the primary input mechanism and the second output mechanism in the circumferential direction; the primary input mechanism is transmission-connected to the second output mechanism through the first branch mechanism, the second branch mechanism and the third branch mechanism; the second output mechanism is a floating output mechanism.

2. According to claim 1, a power three-branch gear transmission device with a floating output gear, characterized in that: The primary input mechanism comprises a primary input gear shaft (1), a primary input gear front bearing (9), a primary input gear rear bearing (10) and a primary input gear flange (21). The primary input gear shaft (1) is inserted into one end of a housing assembly (22), and the front end of the primary input gear shaft (1) is sleeved with the primary input gear front bearing (9), and the rear end of the primary input gear shaft (1) is sleeved with the primary input gear rear bearing (10). The primary input gear shaft (1) is rotatably connected to the housing assembly (22) through the primary input gear front bearing (9) and the primary input gear rear bearing (10). The primary input gear shaft (1) and the primary input gear flange (21) are separate structures. One end of the primary input gear shaft (1) extends outside the housing assembly (22) and is inserted into the primary input gear flange (21) located outside the housing assembly (22). The primary input gear shaft (1) is connected to a power source through the primary input gear flange (21).

3. A power three-branch gear transmission device with a floating output gear according to claim 2, characterized in that: The secondary output mechanism comprises a secondary output pinion shaft (5) and a secondary output gear partition plate (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 plate (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.

4. The power three-branch gear transmission device with a floating output gear according to claim 3, characterized in that: The first branch mechanism comprises a first branch shaft front bearing (11), a first branch shaft rear bearing (12) and a first branch shaft (17). The first branch shaft (17) is inserted into a box assembly (22). The front end of the first branch shaft (17) is fitted with the first branch shaft front bearing (11), and the rear end of the first branch shaft (17) is fitted with the first branch shaft rear bearing (12). The first branch shaft (17) is rotatably connected to the box assembly (22) through the first branch shaft front bearing (11) and the first branch shaft rear bearing (12). The front end of the first branch shaft (7) is sleeved with a first-stage pinion gear (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 gear (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), the first branch shaft (17) is meshed with the first-stage input large gear shaft (1) through the first-stage pinion gear (2) of the first branch shaft, and the first branch shaft (17) is meshed with the second-stage output pinion gear shaft (5) through the second-stage large gear (6) of the first branch shaft.

5. The power three-branch gear transmission device with a floating output gear according to claim 4, characterized in that: The second branch mechanism comprises a second branch shaft front bearing (13), a second branch shaft 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 shaft front bearing (13), and the rear end of the second branch shaft (18) is sleeved with the second branch shaft rear bearing (14). The second branch shaft (18) is rotatably connected to the box assembly (22) through the second branch shaft front bearing (13) and the second branch shaft rear bearing (14). The front end of the second branch shaft (8) is sleeved with a first-stage pinion gear (3) of the second branch shaft, and the rear end of the second branch shaft (18) is sleeved with a second-stage large gear (7) of the second branch shaft, and the first-stage pinion gear (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), the second branch shaft (18) is meshed with the first-stage input large gear shaft (1) through the first-stage pinion gear (3) of the second branch shaft, and the second branch shaft (18) is meshed with the second-stage output pinion gear shaft (5) through the second-stage large gear (7) of the second branch shaft.

6. A power three-branch gear transmission device with a floating output gear according to claim 5, characterized in that: The No. 3 branch mechanism comprises 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 sleeved with the No. 3 branch shaft front bearing (15), and the rear end of the No. 3 branch shaft (19) is sleeved 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 front end of the third branch shaft (9) is sleeved with a first-stage pinion gear (4) of the third branch shaft, and the rear end of the third branch shaft (19) is sleeved 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), 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.

7. A power three-branch gear transmission device with a floating output gear according to claim 6, characterized in that: The number of teeth of the gear part in the first-stage input large gear shaft (1) is Z1, and the number of teeth of the gear part in the second-stage output small gear shaft (5) is Z4, and both Z1 and Z4 are integer multiples of 3.

8. The power three-branch gear transmission device with a floating output gear according to claim 7, 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.

9. A power three-branch gear transmission device with a floating output gear according to claim 8, 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).

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

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