A splitter gearbox with oil film damper

Abstract

The present invention discloses a splitter gearbox with an oil film damper, specifically comprising: a box body, accommodating: a low-speed input shaft, a first bearing supporting the low-speed input shaft; at least one intermediate shaft meshing with the low-speed input shaft through gear transmission, the intermediate shafts being supported by their respective corresponding second bearings; a high-speed output shaft meshing with the intermediate shaft through gear transmission, and a third bearing supporting the high-speed output shaft; an oil film damper, arranged on the third bearing, comprising: a housing, a bearing sleeve arranged in the housing; the bearing sleeve supporting the third bearing; sealing rings are arranged at both ends of the outer surface of the bearing sleeve, and the sealing rings are arranged between the outer surface of the bearing sleeve and the inner surface of the housing; the housing, the bearing sleeve and the sealing ring define an oil film cavity; a first oil inlet channel is provided on the housing, and the lubricating oil in the box body enters the oil film cavity through the first oil inlet channel, forming a damping oil film belt in the oil film cavity, reducing the vibration of the high-speed output shaft during operation and improving the stability of the gear transmission.

Description

Technical Field

[0001] The invention relates to the technical field of gear transmission, and in particular to a splitter gear box with an oil film damper. Background Art

[0002] Current high-speed gearboxes mostly use a parallel shaft transmission structure, with a maximum speed of approximately 80,000 rpm. While this structure offers simple and reliable transmission, its torque transmission capacity is limited by the rotor's inherent strength and linear rotational speed. To increase torque transmission and speed, a splitter structure can be used within the gearbox's internal transmission.

[0003] However, the design of ultra-high-speed splitter gearboxes presents multiple design and manufacturing difficulties, including the problem of smooth operation of ultra-high-speed splitter gearboxes, such as vibration caused by the high speed of the high-speed output shaft, which makes the gears run unsteadily. In addition, there are also problems such as the asynchrony of the two intermediate shaft gears meshing with the high-speed output shaft gear, gearbox sealing problems, and the dynamics of the ultra-high-speed rotor. Summary of the Invention

[0004] In view of the above problems, the present invention provides a splitter gearbox with an oil film damper that overcomes the above problems or at least partially solves the above problems. The technical solution is as follows:

[0005] A splitter gearbox with an oil film damper comprises a housing, wherein the housing contains:

[0006] a low-speed input shaft and a first bearing for supporting the low-speed input shaft;

[0007] at least one intermediate shaft, wherein the intermediate shaft is engaged with the low-speed input shaft through gears;

[0008] at least one second bearing, the at least one intermediate shaft being supported by the respective second bearing;

[0009] a high-speed output shaft and a third bearing for supporting the high-speed output shaft, wherein the high-speed output shaft is engaged with the intermediate shaft through gears for transmission;

[0010] An oil film damper is arranged on the third bearing, and the oil film damper includes: a housing and a bearing sleeve arranged in the housing; the bearing sleeve is arranged on the outside of the third bearing and is used to support the third bearing; sealing rings are provided at both ends of the outer surface of the bearing sleeve, and the sealing rings are arranged between the outer surface of the bearing sleeve and the inner surface of the housing; the housing, the bearing sleeve and the sealing rings at both ends of the outer surface of the bearing sleeve define an oil film cavity; a first oil inlet channel is provided on the housing, and the lubricating oil in the housing enters the oil film cavity through the first oil inlet channel, forming a damping oil film belt in the oil film cavity.

[0011] The above-mentioned gearbox may optionally be provided with an oil quantity control structure at the opening of the first oil inlet channel for controlling the amount of oil entering the oil inlet groove.

[0012] The above-mentioned gearbox, optionally, the high-speed output shaft is supported by two third bearings distributed along the axial direction; two bearing sleeves are arranged in the housing of the oil film damper, and the two bearing sleeves are respectively arranged on the outside of the two third bearings; sealing rings are provided at both ends of the outer surface of each bearing sleeve, and the housing, the two bearing sleeves and the sealing rings on the outer surfaces of the two bearing sleeves are defined as two oil film cavities; the lubricating oil in the box body enters the two oil film cavities through the first oil inlet channel.

[0013] The above-mentioned gearbox may optionally have a circumferentially arranged first annular groove formed on the outer surface of the intermediate shaft, the first annular groove being arranged between the intermediate shaft and the gear sleeved on the intermediate shaft; and a second oil inlet channel connected to the first annular groove is formed in the intermediate shaft.

[0014] The above-mentioned gearbox can optionally have an output end of the high-speed output shaft connected to a coupling, an oil seal is provided at the gap between the coupling and the box body, an inner surface of the oil seal is provided with a circumferentially arranged second annular groove, and an air inlet channel connected to the second annular groove is provided inside the oil seal.

[0015] In the above-mentioned gearbox, optionally, the gears sleeved on the low-speed input shaft, the intermediate shaft and the high-speed output shaft are all spur gears.

[0016] In the above-mentioned gearbox, optionally, the first bearing is an angular contact ball bearing.

[0017] In the above-mentioned gearbox, optionally, each intermediate shaft corresponds to two second bearings distributed axially at both ends of the intermediate shaft, the second bearing arranged at one end of the intermediate shaft is a cylindrical roller bearing, and the second bearing arranged at the other end of the intermediate shaft is a main shaft bearing.

[0018] In the above-mentioned gearbox, optionally, the third bearing is a rolling bearing.

[0019] Optionally, in the above-mentioned gearbox, two intermediate shafts are provided, and the two intermediate shafts are respectively provided in parallel on both sides of the low-speed input shaft and on both sides of the high-speed output shaft.

[0020] Compared with the prior art, the present invention has the following advantages: in the solution provided in the embodiment of the present invention, a diversion structure arrangement of the gear transmission is provided, which is compact in structure and improves the torque transmission capability and speed compared with the parallel structure; an oil film damper is designed at the bearing of the high-speed output shaft, which can reduce the vibration of the high-speed output shaft during operation and improve the stability of the gear transmission.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0023] Figure 1 A schematic structural diagram of a splitter gearbox with an oil film damper provided in an embodiment of the present invention;

[0024] Figure 2 Another structural schematic diagram of a splitter gearbox with an oil film damper provided by an embodiment of the present invention;

[0025] Figure 3 Another structural schematic diagram of a splitter gearbox with an oil film damper provided by an embodiment of the present invention;

[0026] Figure 4 Another structural schematic diagram of a splitter gearbox with an oil film damper provided by an embodiment of the present invention;

[0027] Figure 5 Another structural schematic diagram of a splitter gearbox with an oil film damper provided by an embodiment of the present invention;

[0028] Figure 6 Another structural schematic diagram of a splitter gearbox with an oil film damper provided by an embodiment of the present invention;

[0029] Among them, 1-housing; 2-low-speed input shaft; 3-first bearing; 4-intermediate shaft; 5-cylindrical roller bearing; 6-main shaft bearing; 7-high-speed output shaft; 8-third bearing; 9-oil film damper; 10-coupling; 11-oil film cavity; 12-housing; 13-shutoff screw plug; 14-bearing sleeve; 15-sealing ring; 16-first oil inlet channel; 17-first ring groove; 18-second oil inlet channel; 19-third gear; 20-upper housing; 21-lower housing; 22-oil inlet flange; 23-oil return flange; 24-housing air inlet channel; 25-oil seal; 26-second ring groove; 27-oil seal air inlet channel. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0031] refer to Figure 1 FIG. 1 shows a schematic structural diagram of a splitter gearbox with an oil film damper provided by an embodiment of the present invention. Figure 1 The structure shown is a feasible implementation scheme of the splitter gearbox with an oil film damper provided in an embodiment of the present invention. The splitter gearbox with an oil film damper specifically includes: a box body 1, wherein the box body 1 contains: a low-speed input shaft 2 and a first bearing 3 for supporting the low-speed input shaft; at least one intermediate shaft 4, wherein the intermediate shaft 4 and the low-speed input shaft 2 are transmitted through gear meshing; at least one second bearing, wherein the at least one intermediate shaft 4 is supported by the corresponding second bearing; a high-speed output shaft 7 and a third bearing 8 for supporting the high-speed output shaft, wherein the high-speed output shaft 7 and the intermediate shaft 4 are transmitted through gear meshing.

[0032] In the structure provided by the embodiments of the present invention, to achieve a speed-increasing gearbox, the input shaft is a low-speed shaft, and the output shaft is a high-speed shaft. The shaft head of the low-speed input shaft 2 can optionally be connected to a motor via a coupling, and the rotation of the motor drives the low-speed input shaft 2. The low-speed input shaft 2 is supported by a first bearing 3. Optionally, a first bearing 3 can be provided at each axial end of the low-speed input shaft 2, with the two first bearings 3 jointly supporting the low-speed input shaft 2. Furthermore, the first bearing 3 can optionally be an angular contact ball bearing.

[0033] In the structure provided by the embodiment of the present invention, the low-speed input shaft 2, the intermediate shaft 4, and the high-speed output shaft 7 are all gear shafts. The transmission is achieved between the low-speed input shaft 2 and the intermediate shaft 4 through gear meshing, and the transmission is also achieved between the intermediate shaft 4 and the high-speed output shaft 7 through gear meshing. At least one intermediate shaft 4 is provided. When two or more intermediate shafts 4 are provided, the two or more intermediate shafts 4 serve as splitter shafts. Figure 1 Optionally, two intermediate shafts 4 are provided, one parallel to the other on either side of the low-speed input shaft 2. The low-speed input shaft 2 meshes with the two intermediate shafts 4 on either side via gears. The high-speed output shaft 7 is parallel to the two intermediate shafts 4 and meshes with the two intermediate shafts 4 on either side via gears. Furthermore, a first gear is mounted on the low-speed input shaft 2, a second gear and a third gear are mounted on the intermediate shaft 4, and a fourth gear is mounted on the high-speed output shaft 7. The first gear and the second gear mesh, and the third gear and the fourth gear mesh. The second and third gears rotate coaxially. The rotation of the motor drives the low-speed input shaft 2, and the first gear rotates with the low-speed input shaft 2. The first gear transmits torque to the intermediate shaft 4 through the meshing of the first and second gears, and then transmits torque to the high-speed output shaft 7 through the meshing of the third and fourth gears, thus achieving power transmission within the gearbox.

[0034] In the structure provided by the embodiments of the present invention, each intermediate shaft 4 is supported by its corresponding second bearing. Optionally, an intermediate shaft 4 can be supported by two second bearings located at both ends. Furthermore, the two second bearings supporting an intermediate shaft 4 can be of the same type or different types. For example, the second bearing located at one end of the intermediate shaft 4 can be a cylindrical roller bearing 5, while the second bearing located at the other end of the intermediate shaft 4 can be a main shaft bearing 6. Furthermore, the cylindrical roller bearing 5 is located on the intermediate shaft 4 near the second gear, and the main shaft bearing 6 is located on the intermediate shaft 4 near the third gear, with the second and third gears disposed between the cylindrical roller bearing 5 and the main shaft bearing 6.

[0035] The split gearbox provided by the embodiment of the present invention has an oil film damper 9 designed for the high-speed output stage. The oil film damper 9 is arranged on the third bearing 8; Figure 2A schematic diagram of the specific structure of an oil film damper 9 in a diverter gearbox with an oil film damper provided in an embodiment of the present invention is shown, wherein the oil film damper 9 comprises: a housing 12 and a bearing sleeve 14 arranged in the housing 12; the bearing sleeve 14 is sleeved on the outside of the third bearing 8 for supporting the third bearing 8; sealing rings 15 are provided at both ends of the outer surface of the bearing sleeve 14, and the sealing rings 15 are arranged between the outer surface of the bearing sleeve 14 and the inner surface of the housing 12; the housing 12, the bearing sleeve 14 and the sealing rings 15 at both ends of the outer surface of the bearing sleeve define an oil film cavity 11; a first oil inlet channel 16 is provided on the housing 12, and the lubricating oil in the box body 1 enters the oil film cavity 11 through the first oil inlet channel 16, forming a damping oil film belt in the oil film cavity 11.

[0036] In the structure provided by the embodiment of the present invention, the oil film damper 9 is arranged inside the housing 1 and supported by the housing 1, and the housing 12 can be fixedly connected to the housing 1. The bearing sleeve 14 provided in the housing 12 is used to support the third bearing 8. The vibration generated by the high-speed output shaft 7 during operation is suppressed by the setting of the oil film damper 9. The implementation principle is as follows: sealing rings 15 are provided at both ends of the outer surface of the bearing sleeve 14, and the sealing rings 15 are arranged between the outer surface of the bearing sleeve 14 and the inner surface of the housing 12, so that the inner surface of the housing 12, the outer surface of the bearing sleeve 14 and the sealing rings 15 at both ends of the outer surface of the bearing sleeve form an oil film cavity 11; a first oil inlet channel 16 is then provided on the housing 12, and the first oil inlet channel 16 is connected to the housing 1 and the oil film cavity 11; the gearbox housing 1 is usually provided with lubricating oil for lubricating the internal rotating structure of the gearbox, and the first oil inlet channel 16 introduces the lubricating oil in the housing 1 into the oil film cavity 11. Optionally, a small hole is arranged on the bearing sleeve 14, and the oil enters the gap between the bearing sleeve 14 and the housing 12 through the small hole on the bearing sleeve 14. The gap is reasonably configured and passes through the sealing rings 15 at both ends of the bearing sleeve 14. During the operation of the high-speed output shaft 7, the lubricating oil circulates in the oil film cavity 11 to form a stable damping oil film belt, thereby suppressing the vibration generated by the high-speed output shaft 7 during operation.

[0037] In the structure provided by the embodiment of the present invention, optionally, the first oil inlet channel 16 is an oil inlet ring groove arranged on the shell 12, and the oil inlet ring groove is connected to the oil film cavity 11; further, an oil quantity control structure can be provided at the opening of the first oil inlet channel 16, and the oil quantity control structure is used to control the amount of oil entering the oil inlet groove. Optionally, the oil quantity control structure is a shut-off plug 13, and the shut-off plug 13 seals and controls the flow of lubricating oil entering the oil film cavity 11 from the first oil inlet channel 16.

[0038] In the structure provided in the embodiment of the present invention, optionally, the high-speed output shaft 7 is supported by the two third bearings 8 distributed in the axial direction; the oil film damper 9 is used to support each third bearing 8, and correspondingly, two bearing sleeves 14 are provided in the housing 12 of the oil film damper 9, and the two bearing sleeves 14 are respectively sleeved on the outside of the two third bearings 8; a sealing ring 15 is provided at both ends of the outer surface of each bearing sleeve 14, and the housing 12, the two bearing sleeves 14 and the sealing rings 15 on the outer surfaces of the two bearing sleeves define two oil film cavities 11, and the two oil film cavities 11 are respectively formed at the two bearing sleeves 14 supporting the two third bearings 8, see Figure 2 The lubricating oil in the housing 1 enters the two oil film cavities 11 through the first oil inlet passage 16. Furthermore, the third bearing 8 is a rolling bearing, and the oil film damper 9 is an oil film damper structure of a rolling bearing.

[0039] The splitter gearbox provided in the embodiment of the present invention has an additional adjustment structure for the intermediate shaft gear in order to solve the problem of synchronous rotation of the intermediate shaft; Figure 3 FIG. 1 shows a schematic diagram of the specific structure of an intermediate shaft in a split gearbox with an oil film damper provided by an embodiment of the present invention, with reference to FIG. Figure 4The schematic diagram shows the structure of a splitter gearbox with an oil film damper, provided by an embodiment of the present invention, in which two intermediate shafts are connected to a high-speed output shaft 7. The outer surface of the intermediate shaft 4 is provided with a circumferentially arranged first annular groove 17, located between the intermediate shaft 4 and the gear mounted thereon. A second oil inlet passage 18 is provided within the intermediate shaft 4, connecting to the intermediate shaft 4. Lubricating oil within the housing 1 enters the first annular groove 17 through the second oil inlet passage 18. High-pressure oil is applied between the intermediate shaft 4 and the gear mounted thereon, spreading the mating surfaces between the shafts and the gears, allowing the gears mounted on the intermediate shaft 4 to rotate and adjust. The intermediate shaft 4 includes a second gear meshing with the first gear on the low-speed input shaft and a third gear 19 meshing with the fourth gear on the high-speed input shaft. The third gear 19 is a large, high-speed gear. Typically, the first annular groove 17 is provided between the intermediate shaft 4 and the third gear 19. The third gear 19 and the intermediate shaft 4 are assembled by heat-insertion interference fit. By drilling a process hole in the end face of the intermediate shaft 4 and opening a first annular groove 17 on the shaft and gear mating surface, the heat-insertion mating surface between the intermediate shaft 4 and the third gear 19 can be expanded by applying high-pressure oil during the assembly process. When the two intermediate shafts 4 are respectively engaged with the high-speed output shaft 7 through gear meshing transmission, to ensure that the intermediate shafts 4 on both sides of the high-speed output shaft 7 rotate synchronously, the third gears 19 on both sides can be rotated simultaneously to adjust the circumferential position of the two diverter gears, i.e., the two third gears 19, to be equivalent to the high-speed gear, i.e., the fourth gear, so that the meshing of the gears on both sides meets the inspection standard at the same time. At the same time, during the gear machining process, the normal line error of the fourth gear and the two third gears 19 meshing with it is controlled to meet the synchronous load-sharing requirements during the torque transmission process, thereby achieving synchronization of the two intermediate shaft gears by controlling machining tolerances and hydraulic adjustment.

[0040] The structure provided by the embodiment of the present invention further solves the synchronization problem of the ultra-high-speed diverter gearbox. Optionally, the gear meshing on the low-speed input shaft 2, the intermediate shaft 4 and the high-speed output shaft 7 all adopts a straight tooth design, that is, the first gear, the second gear, the third gear and the fourth gear are all straight gears. In the design of traditional high-speed gearboxes, the gear pair design mostly adopts a helical tooth structure, because compared with the straight tooth structure, the helical tooth structure provides a higher degree of overlap and improves the stability of the gear transmission, but it also generates a certain axial force. In the structure provided by the embodiment of the present invention, the straight tooth design avoids the axial misalignment of the diverter gear caused by the axial force of the helical teeth while meeting the service coefficient requirements, providing a basis for better adjusting the synchronization of the two-stage diverter gears and achieving load balancing.

[0041] refer to Figure 5The figure shows a schematic diagram of the housing structure of a diverter gearbox with an oil film damper provided by an embodiment of the present invention. The housing 1 includes an upper housing 20 and a lower housing 21. The lower housing 21 is provided with an oil inlet and an oil return port. Oil is supplied to the oil inlet through an oil inlet flange 22, and oil is returned to the oil return port through an oil return flange 23. During the operation of the diverter gearbox provided by an embodiment of the present invention, the lubricating oil of the oil station enters the housing 1 through the oil inlet flange 19. The lubricating oil in the housing 1 enters the oil film cavity 11 through the first oil inlet channel 16. The lubricating oil in the housing 1 enters the first annular groove 17 through the second oil inlet channel 18. In addition, the lubricating oil in the housing 1 flows back to the oil tank of the oil station through the oil return flange 20 after being fully lubricated at each lubrication point.

[0042] The splitter gearbox provided in the embodiment of the present invention adopts the following optimized design to solve the dynamic problems of the ultra-high-speed rotor:

[0043] Design 1: The high-speed bearing system is optimized. Specifically, rolling bearings are used to support the high-speed output shaft 7, and an oil film damper 9 is designed. The lubricating oil enters the shell 12 of the oil film damper 9 through the housing 1, and enters the gap between the bearing sleeve 14 and the shell 12 through the first oil inlet channel 16 inside the shell 12. During operation, a damping oil film is established to suppress the vibration of the bearing body 14 during high-speed operation.

[0044] Design 2: Consider the impact of the high-speed stage diversion design on the high-speed shaft rotor dynamics. Due to the use of a diversion structure, such as setting two intermediate shafts 4, during operation, the gear meshing forces between the high-speed output shaft 7 and the two intermediate shafts 4 at both ends are the same in magnitude but opposite in direction. The third bearing 8 of the high-speed output shaft 7 only bears the self-gravity of the high-speed output shaft 7. The high-speed output shaft 7 is evenly stressed without imbalance caused by bending moment, which makes the rotor dynamics calculation conditions of the high-speed output shaft 7 simpler and clearer.

[0045] Design three, control of the residual unbalance of the high-speed output shaft. The residual unbalance plays a very critical role in the control of the critical speed of the high-speed rotor. In the structure provided by the embodiment of the present invention, the residual unbalance of the high-speed output shaft 7 is controlled according to the G0.8 level, and the de-weighting position is selected to be accurately positioned according to the rotor working vibration mode to ensure that the critical speed range and amplitude value are controllable during operation.

[0046] Design 4: Solve the sealing problem of ultra-high-speed split gearbox, refer to Figure 6The figure shows a schematic diagram of the sealing structure at the coupling connected to the output end of the high-speed output shaft in a diverter gearbox with an oil film damper provided by an embodiment of the present invention. The output end of the high-speed output shaft 7 is connected to the coupling 10. An oil seal 25 is provided in the gap between the coupling 10 and the housing 1. The inner surface of the oil seal 25 is provided with a circumferentially arranged second annular groove 26. An air inlet channel 27 communicating with the second annular groove 26 is provided in the oil seal 25. In the structure provided by the embodiment of the present invention, high-pressure gas enters the second annular groove 26 through the air inlet channel 27 and is introduced into the shaft diameter position, thereby blocking the axial movement of the gas generated by the negative pressure generated by the high-speed rotation of the coupling 10, thereby preventing the leakage of lubricating oil. Alternatively, the air inlet channel 27 can extend directly from the outer surface of the oil seal 25, allowing high-pressure gas to enter through the air inlet channel 27 within the oil seal 25. The air inlet channel 27 can also be connected to the housing 1, with the housing air inlet channel 24 provided at a corresponding position on the housing 1. High-pressure gas is introduced through the air inlet hole of the housing 1, passes through the housing air inlet channel 24 and the oil seal's air inlet channel 27, and enters the second annular groove 26, where it is introduced to the shaft diameter. Furthermore, the seal of the housing 1 can optionally be a comb seal. By increasing the radial high-pressure gas input between the comb teeth, the axial movement of the gas at the seal shaft diameter is disrupted, thereby preventing lubricating oil from leaking out of the housing 1.

[0047] The splitter gearbox provided in an embodiment of the present invention addresses the operational stability issues of ultra-high-speed splitter gearboxes by improving the gear machining accuracy, heat treatment process, and tooth profile modification technology. The improved gear machining accuracy and heat treatment process are used because the gears on the high-speed output shaft are small in size, small in module, and high in speed. Furthermore, to meet tooth surface hardness requirements, carburizing and quenching are used. To meet these requirements, the gear machining accuracy must be increased to level 3. While ensuring transmission accuracy, the heat treatment process is controlled to avoid heat treatment defects. Tooth profile modification causes the gear teeth to bulge in the center of the tooth width, thereby improving the uneven load distribution on the gear tooth contact line.

[0048] The shunt gearbox provided in the embodiment of the present invention adopts a shunt structure arrangement for gear transmission, which is compact in structure and solves the synchronization problems, operation stability problems and sealing problems of ultra-high-speed shunt gearboxes, as well as the dynamic problems of ultra-high-speed rotors. Compared with the traditional parallel structure, it can transmit greater torque, achieve higher speeds, have a larger reduction ratio, and the transmission process is more stable. In the embodiment, a two-stage shunt gear transmission is used to achieve power and reduction ratio torque transmission, reduce the layout space of the unit, and meet the requirements of high-speed testing. After testing, the input end of the shunt gearbox provided in the embodiment of the present invention is connected to an ordinary motor with an output speed of 3000rpm, which can increase the speed to 100,000rpm, meeting various aviation parts testing, wind tunnel testing, industrial applications and other occasions.

[0049] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A splitter gearbox with an oil film damper, characterized in that: The invention comprises a box body, wherein the box body contains: a low-speed input shaft and a first bearing for supporting the low-speed input shaft; at least one intermediate shaft, wherein the intermediate shaft is engaged with the low-speed input shaft through gears; at least one second bearing, the at least one intermediate shaft being supported by the respective second bearing; a high-speed output shaft and a third bearing for supporting the high-speed output shaft, wherein the high-speed output shaft is engaged with the intermediate shaft through gears for transmission; An oil film damper is provided on the third bearing, the oil film damper comprising: a housing and a bearing sleeve provided in the housing; the bearing sleeve is provided on the outside of the third bearing for supporting the third bearing; sealing rings are provided at both ends of the outer surface of the bearing sleeve, and the sealing rings are arranged between the outer surface of the bearing sleeve and the inner surface of the housing; the housing, the bearing sleeve, and the sealing rings at both ends of the outer surface of the bearing sleeve define an oil film cavity; a first oil inlet channel is provided on the housing, and lubricating oil in the housing enters the oil film cavity through the first oil inlet channel, forming a damping oil film belt in the oil film cavity; A first annular groove arranged circumferentially is formed on the outer surface of the intermediate shaft. The first annular groove is arranged between the intermediate shaft and a gear sleeved on the intermediate shaft. A second oil inlet channel connected to the first annular groove is formed in the intermediate shaft.

2. The splitter gearbox with an oil film damper according to claim 1, characterized in that: An oil quantity control structure is provided at the opening of the first oil inlet channel for controlling the amount of oil entering the oil inlet tank.

3. The splitter gearbox with an oil film damper according to claim 1 or 2, characterized in that: The high-speed output shaft is supported by two third bearings distributed along the axial direction; two bearing sleeves are arranged in the housing of the oil film damper, and the two bearing sleeves are respectively arranged on the outside of the two third bearings; sealing rings are provided at both ends of the outer surface of each bearing sleeve, and the housing, the two bearing sleeves and the sealing rings on the outer surfaces of the two bearing sleeves are defined as two oil film cavities; the lubricating oil in the box body enters the two oil film cavities through the first oil inlet channel.

4. The splitter gearbox with an oil film damper according to claim 1, characterized in that: The output end of the high-speed output shaft is connected to a coupling. An oil seal is provided at the gap between the coupling and the housing. A circumferentially arranged second annular groove is provided on the inner surface of the oil seal. An air inlet channel communicating with the second annular groove is provided inside the oil seal.

5. The splitter gearbox with an oil film damper according to claim 1, characterized in that: The gears sleeved on the low-speed input shaft, the intermediate shaft and the high-speed output shaft are all spur gears.

6. The splitter gearbox with an oil film damper according to claim 1, characterized in that: The first bearing is an angular contact ball bearing.

7. The splitter gearbox with an oil film damper according to claim 1, characterized in that: Each intermediate shaft corresponds to two second bearings distributed axially at both ends of the intermediate shaft. The second bearing arranged at one end of the intermediate shaft is a cylindrical roller bearing, and the second bearing arranged at the other end of the intermediate shaft is a main shaft bearing.

8. The splitter gearbox with an oil film damper according to claim 3, characterized in that: The third bearing is a rolling bearing.

9. The splitter gearbox with an oil film damper according to claim 1, characterized in that: Two intermediate shafts are provided, and the two intermediate shafts are respectively and parallelly arranged on both sides of the low-speed input shaft and on both sides of the high-speed output shaft.

Images