Transmission gearbox

Abstract

The present invention discloses a transmission gearbox, which includes a box body structure, as well as a lubrication system, a breather assembly, an input shaft and an output shaft arranged within the box body structure. The breather assembly is configured to balance the pressure inside and outside the gearbox; the input shaft and the output shaft are arranged in parallel within the box body structure through bearing assemblies, and are respectively provided with an input gear and an output gear. Gear transmission is achieved through the meshing of the input gear and the output gear. And the lubrication system is driven by the output shaft to lubricate the transmission gearbox; the transmission gearbox provided by the present invention uses a dedicated lubrication system for cooling and adopts forced lubrication; through the parameter setting of the cylindrical gear pair, the meshing and power transmission between the output shaft and the input shaft are further ensured, and the power transmission is completed; it has the characteristics of simple installation, strong bearing capacity, small volume and high transmission performance, and improves the transmission efficiency and reliability of the gearbox.

Description

Technical Field

[0001] The present invention relates to the technical field of gear drive devices, and particularly relates to a transmission gearbox for a hybrid locomotive. Background Art

[0002] The transmission gearbox is an important component in mechanical equipment and undertakes the power transmission of mechanical equipment. In the prior art, due to the pump impeller and turbine in the hydrodynamic transmission device, the gearbox not only has a large volume, but also has the disadvantages of low transmission efficiency and poor reliability. Moreover, in a common gearbox, a bearing is provided on each side of the gear shaft, and the two ends of the gear shaft bear radial force and axial force simultaneously. The gear shaft is stressed bidirectionally, and its service life will be affected after long-term use. For the transmission device of a hybrid locomotive, due to the structural limitations of the input end and the output end, it is impossible to increase the service life of the bearing by increasing the center distance. Therefore, the gearbox in the prior art has the disadvantages of large volume, heavy weight, and inability to effectively transmit torque. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a transmission gearbox for a hybrid locomotive, which is used to solve the technical problems of large volume, low transmission efficiency, and poor reliability of the gearbox of the drive device in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A transmission gearbox includes a box body structure, a lubrication system, a breather assembly, an input shaft, and an output shaft disposed within the box body structure. The box body structure is composed of a lower box body, a middle box body, an upper box body, a fiber gasket, and a cover plate. The cover plate covers the upper box body through the fiber gasket. The lubrication system is disposed within the lower box body. The breather assembly is disposed on the middle box body and is used to balance the pressure inside and outside the gearbox. The output shaft is disposed at the connection of the lower box body and the middle box body, and the input shaft is disposed at the connection of the middle box body and the upper box body. The output shaft is respectively connected to the input shaft and the lubrication system. The output shaft rotates by driving the input shaft connected to the motor, and the power is transmitted through the output shaft, and the lubrication system is driven to lubricate the transmission gearbox. The input shaft and the output shaft are disposed in parallel within the box body structure through bearing assemblies, and are respectively provided with an input gear and an output gear. The gear transmission is achieved through the meshing of the input gear and the output gear.

[0006] Further, the bearing assembly includes a first bearing assembly, a second bearing assembly, a third bearing assembly, a fourth bearing assembly, and a fifth bearing assembly. The first bearing assembly and the second bearing assembly are respectively arranged at both ends of the input shaft to support the input shaft; the fourth bearing assembly and the fifth bearing assembly are respectively arranged at both ends of the output shaft to support the output shaft; the third bearing assembly is arranged on both sides of the output gear of the output shaft to position the output gear.

[0007] Further, the first bearing assembly and the second bearing assembly respectively use cylindrical roller bearings and / or four-point ball bearings to install the input shaft; the third bearing assembly, the fourth bearing assembly, and the fifth bearing assembly respectively use cylindrical roller bearings and / or four-point ball bearings to install the output shaft.

[0008] Further, the first bearing assembly uses a cylindrical roller bearing, and the second bearing assembly uses a cylindrical roller bearing and a four-point ball bearing, and both are provided with an oil slinger, an end cover, a first bearing sleeve, a spacer ring, a plug, and a spacing ring for fixedly sealing the bearings.

[0009] Further, the third bearing assembly uses a cylindrical roller bearing and a four-point ball bearing, and is provided with a pressure ring, a bearing pad, and a second bearing sleeve for fixedly sealing the bearings. The output gear is positioned by the third bearing assembly; the fourth bearing assembly uses a cylindrical roller bearing, and the fifth bearing assembly uses a four-point ball bearing, and both are provided with a gland, a third bearing sleeve, a flange, and a flange cover plate. The bearings are installed and fixed by the gland and the third bearing sleeve. The flange is connected to the gland, and the flange pressing plate is arranged at the end of the output shaft, and the flange is installed and fixed by the flange pressing plate.

[0010] Further, an oil pump large gear is arranged on the output shaft to drive the lubrication system; the lubrication system includes an oil pump gear, a pump seat, an oil sump assembly, and a filter. The oil pump gear, the filter, and the oil sump assembly are all arranged on the pump seat, are connected by the oil pump gear and the oil pump large gear formed by the output shaft, and the lubrication system is fixed by the oil sump assembly.

[0011] Further, an oil passage and an adjusting mechanism are also arranged in the transmission gearbox, and the amount of oil in the oil passage is adjusted by the adjusting mechanism.

[0012] Further, the output shaft is connected with a connecting sleeve through a spline, and the output gear is connected through the connecting sleeve.

[0013] Further, the input gear and the output gear adopt an interference fit, and the interference amount is 0.18 - 0.20 mm.

[0014] Further, the input gear and the output gear are meshed to form a cylindrical gear pair. The cylindrical gear pair is made of 20CrMnMoA material, with a center distance a = 583 mm, a normal module of 8 mm, a tooth number ratio of the output gear to the input gear of 97 / 43, 103 / 37 or 86 / 54, a helix angle of 9 - 14°, and a gear width of 30 mm.

[0015] The beneficial effects of the present invention are as follows:

[0016] The transmission gearbox provided by the present invention has a compact structure, and a reasonable structure is adopted for easy assembly and detection; a dedicated lubrication system is used for cooling, and forced lubrication is adopted for all. The sealing structure is reasonable to prevent oil leakage, and it has high reliability. Through the parameter setting of the cylindrical gear pair, the meshing and power transmission between the output shaft and the input shaft are further ensured, and corresponding motors or corresponding control components can be connected to both ends to complete the power transmission; the gearbox has the characteristics of strong load-bearing capacity, high efficiency, long service life, low noise, dust-proof and waterproof, and has the advantages of simple installation and stable and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the external structure of the gearbox according to the embodiment of the present invention.

[0018] Figure 2 It is a schematic longitudinal cross-sectional view of the gearbox according to the embodiment of the present invention.

[0019] Figure 3 It is a schematic transverse cross-sectional view of the gearbox according to the embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the structure composed of the input shaft according to the embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure composed of the output shaft according to the embodiment of the present invention.

[0022] Figure 6 It is an installation structure diagram of the lubrication system according to the embodiment of the present invention.

[0023] Figure 7 It is a front view of the lubrication system according to the embodiment of the present invention.

[0024] Figure 8 It is a right view of the lubrication system according to the embodiment of the present invention.

[0025] Figure 9 It is a front view of the gearbox according to the embodiment of the present invention.

[0026] Reference Numerals: 1 - lower box body; 2 - middle box body; 3 - upper box body; 4 - cover plate; 5 - fiber gasket; 6 - mounting seat; 7 - breather; 8 - first box cover; 9 - second box cover; 10 - filler port; 11 - drain port; 12 - oil level gauge; 13 - input shaft; 14 - output shaft; 101 - input gear; 102 - oil slinger I; 103 - end cover I, 104 - bearing sleeve I; 105 - spacer ring I; 106 - spacing ring I; 107 - plug I; 201 - cylindrical roller bearing II; 202 - four-point ball bearing I; 203 - spacer ring II; 204 - spacer ring III; 205 - spacing ring II; 206 - pin; 207 - bearing sleeve II; 208 - end cover II; 301 - output gear; 302 - connecting sleeve; 303 - bearing retainer; 304 - bearing pad; 305 - bearing sleeve III; 306 - cylindrical roller bearing III; 307 - four-point ball bearing IV; 401 - oil pump large gear; 402 - cylindrical roller bearing II; 403 - bearing sleeve IV; 404 - gland; 405 - flange I; 406 - flange cover plate I; 501 - oil pump gear; 502 - pump seat; 503 - oil sump assembly; 504 - filter; 505 - oil passage; 506 - oil outlet passage; 507 - steel ball; 508 - spring; 509 - oil baffle. Detailed Embodiment

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention.

[0028] The following Figures 1-9 illustrates the detailed embodiments of the present invention.

[0029] Embodiment, as Figures 1-3 shown, a transmission gearbox for a hybrid locomotive includes a lower box body 1, a middle box body 2, an upper box body 3 and a cover plate 4. The lower box body has an open top structure, and the middle box body and the upper box body both have open top and bottom structures. The upper box body and the lower box body are respectively connected through the upper and lower openings of the middle box body, and the top opening of the upper box body is covered by the cover plate to close the entire gearbox. Preferably, a fiber gasket 5 is provided under the cover plate, and the cover plate is tightly covered on the upper box body through the fiber gasket to ensure the sealing performance of the gearbox.

[0030] On the outer surface of the gearbox in this embodiment, there are a nameplate, a first cover 8, a second cover 9, a mounting seat 6, a filling port 10, a drain port 11, and an oil level gauge 12; on the left and right sides of the middle box body, there are symmetrically arranged mounting seats for installing and fixing the gearbox; both the first cover and the second cover are fixedly arranged around the lower box body through bolts and washers. Among them, the first cover is arranged on the left and right sides of the lower box body, and the second cover is arranged on the front and back sides of the lower box body for observing or maintaining the interior of the lower box body of the gearbox; and on the front side, there are also a nameplate, a filling port, a drain port, and an oil level gauge. The gearbox is refueled and drained through the filling port, the drain port, and the oil level gauge, and the oil quantity in the gearbox is observed.

[0031] Inside the gearbox in this embodiment, there are a lubrication system assembly, a breather 7, and an input shaft assembly and an output shaft assembly that are parallel to each other. Among them, the input shaft 13 of the input shaft assembly is arranged between the upper box body and the middle box body, and the output shaft 14 of the output shaft assembly is arranged between the middle box body and the lower box body. The lubrication system of the lubrication system assembly is arranged inside the lower box body for cooling and lubricating the devices inside the gearbox to prevent the temperature inside the driving device from being too high and affecting each part; the breather 7 is arranged inside the middle box body for balancing the pressure inside and outside the gearbox driving device, ensuring the balance of the gearbox, and preventing the leakage of lubricating oil. The transmission between the input shaft and the output shaft can be realized through a gear transmission mechanism, a worm and worm gear transmission mechanism, a belt pulley transmission mechanism, or a planetary gear transmission mechanism, etc.

[0032] In another embodiment, the input shaft 13 and the output shaft 14 in this embodiment adopt gear transmission. Through the meshing of the gear structures of the input shaft and the output shaft, the drive conversion of the gearbox is completed.

[0033] As Figure 4 shown, the input shaft assembly in this embodiment includes: an input shaft 13, a first bearing assembly, a second bearing assembly, and an input gear 101. An input gear is fixedly arranged in the middle of the input shaft, and the front and rear ends respectively pass through the first bearing assembly and the second bearing assembly and extend outside the gearbox. The input shaft is arranged inside the gearbox through the first bearing assembly and the second bearing assembly and can rotate relative to the gearbox.

[0034] Among them, the first bearing assembly is arranged at the front end of the input shaft and includes structures such as cylindrical roller bearing I, oil slinger I 102, end cover I 103, bearing sleeve I 104, spacer ring I 105, plug I, spacing ring I 106, bolt I 107 and washer I. The cylindrical roller bearing I is fixedly sleeved on the input shaft. A spacing ring I is arranged on the right side of the cylindrical roller bearing I to perform spacing installation on the installation position of the cylindrical roller bearing I, so that the input gear does not contact the first bearing assembly when rotating. An oil slinger I is arranged on the left side of the cylindrical roller bearing I, and the excess oil in the input shaft is thrown out of the gearbox through the oil slinger. An end cover I is fitted on the outside of the oil slinger I, a bearing sleeve I is arranged on the cylindrical roller bearing I, a spacer ring I is arranged between the end cover I and the bearing sleeve I, and they are fixed by bolt I and washer I. An oil inlet hole is also arranged on the bearing sleeve I, and the plug port of the bearing sleeve I is sealed by plug I to prevent the oil from being thrown out from the plug port.

[0035] The second bearing assembly is arranged at the rear end of the input shaft and includes structures such as cylindrical roller bearing II 201, oil slinger II, end cover II 208, bearing sleeve II 207, spacer ring II 203, plug II, spacing ring II 205, bolt II, washer II, four-point ball bearing I 202, pin 206 and spacer ring III 204. The difference between the second bearing assembly and the first bearing assembly is that the bearings of the second bearing assembly are composed of cylindrical roller bearing II and four-point ball bearing I, a spacing ring II is arranged between them, and a pin for fixing the four-point ball bearing I is also arranged.

[0036] As Figure 5 shown, the output shaft assembly of this embodiment includes an output shaft, a third bearing assembly, a fourth bearing assembly, a fifth bearing assembly, an output gear 301 and a connecting sleeve 302. The connecting sleeve is sleeved on the middle part of the output shaft and is fixedly connected with the output gear by bolts, and the output gear meshes with the input gear; a third bearing assembly is sleeved outside the connecting sleeve, and the fourth bearing assembly and the fifth bearing assembly are respectively sleeved on the front and rear ends of the output shaft. The output shaft is rotatably arranged in the gearbox through the above three bearing assemblies, and the output shaft is driven to rotate by connecting the motor through the input shaft, and corresponding devices are connected for driving.

[0037] Furthermore, the third bearing assembly includes structures such as bearing retaining ring 303, bearing pad 304, bearing sleeve III 305, cylindrical roller bearing III 306, four-point ball bearing III and four-point ball bearing IV 307. Among them, the cylindrical roller bearing III and the four-point ball bearing III are arranged on the left side of the connecting sleeve, and a bearing pad is arranged between them; the four-point ball bearing IV is arranged on the right side of the connecting sleeve, and the cylindrical roller bearing III, the four-point ball bearing III and the four-point ball bearing IV are fixed by the bearing sleeve III and the bearing retaining ring.

[0038] The fourth bearing assembly includes structures such as gland 404, bearing sleeve Ⅳ 403, large oil pump gear 401, cylindrical roller bearing Ⅱ 402, flange Ⅰ 405, flange cover plate Ⅰ 406, washers and bolts. A four-point ball bearing Ⅱ is sleeved on the front end of the output shaft. The large oil pump gear is arranged on the right side of the four-point ball bearing Ⅱ, and the large oil pump gear abuts against the convex part of the output shaft for meshing connection with the lubrication system. The gland is arranged on the front side of the four-point ball bearing Ⅱ, and the bearing sleeve Ⅳ is arranged outside the four-point ball bearing Ⅱ. The four-point ball bearing Ⅱ is covered and fixed by the gland and the bearing sleeve Ⅳ. A flange is also embedded on the right side of the gland. The other end of the flange is provided with a groove. The flange pressing plate is arranged in the groove of the flange and is fixed to the end of the output shaft by bolts and washers.

[0039] The difference between the fifth bearing assembly and the fourth bearing assembly is only that the fifth bearing assembly is not provided with a large oil pump gear, and the bearing is a cylindrical roller bearing, and other structures are the same as those of the fourth bearing assembly.

[0040] Preferably, an oil baffle 509 is also arranged at the bottom of the gearbox to seal the output gear through the oil baffle 509, so that the engine oil in the lower box body will not directly enter the output gear. At the same time, it is ensured that the engine oil can enter the input shaft and the output shaft from the upper part of the gearbox through the corresponding channels to lubricate the machinery inside the gearbox.

[0041] As Figures 6-8 shown, the lubrication system composition of this embodiment is arranged at the front end of the lower box body of the gearbox and includes structures such as oil pump gear 501, pump seat 502, oil sump assembly 503, filter 504, bolts and washers. The oil pump gear is arranged above the pump seat, and the filter is arranged on the lower side of the pump seat. An oil passage 505 is arranged in the gearbox, and the oil passage is connected with the filter. The engine oil entering the lubrication system composition is filtered through the filter to adsorb the magnetic particles in the lubricating oil to prevent dust and sundries from entering the transmission system. The oil pump gear meshes with the large oil pump gear composed of the output shaft. When the output shaft assembly works, it drives the oil pump gear of the lubrication system composition to rotate, so that the engine oil enters the oil passage through the filter and transports the engine oil to the corresponding structures, thereby lubricating the gearbox. The bottom of the pump seat is fixedly arranged on the oil sump assembly and is fixed by bolts and washers. Preferably, an adjusting mechanism for adjusting the oil volume in the lubrication system composition is also arranged on the pump seat. An oil outlet passage 506 connected to the oil passage is arranged on the pump seat, and the oil outlet passage is closed by the adjusting mechanism. The adjusting mechanism includes a steel ball 507 and a spring 508. When the oil volume in the oil passage is large, the steel ball is extruded, and the spring on the left side of the steel ball is compressed, so that the oil is discharged from the oil outlet passage and enters the bottom of the gearbox, thereby adjusting the oil volume in the oil passage.

[0042] In another embodiment, the output gear is connected to the connecting sleeve by bolts, and the connecting sleeve is connected to the output shaft by a key, preferably a rectangular spline. The circumferential fixation of the output shaft and the connecting sleeve, as well as the transmission of motion and torque, are achieved through the key connection. The input gear and the output gear transmit torque through interference fit, and the interference amount is 0.18 - 0.20 mm. Preferably, the input gear and the output gear adopt an interference fit with a taper of 1:50, and the interference amount is 0.16 mm. The interference fit not only facilitates assembly and disassembly but also improves the transmission of torque and axial force, ensuring the positioning accuracy of the gears and the transmission of torque from the input shaft to the input gear.

[0043] For the gearbox of the present invention, both ends of the input shaft and the output shaft can be connected to corresponding motors or corresponding control components to complete the transmission of power. In addition, the front and rear ends of the input shaft and the output shaft of the present invention are arranged in the gearbox through corresponding bearing assemblies, and the input shaft and the output shaft are meshed and connected to drive the output shaft to rotate; by separating the input shaft and the output shaft through the transmission shaft, the reverse torque generated by the drive shaft caused by the reverse acting forces of the motor and the control components is avoided, preventing damage to the drive shaft or excessive plastic deformation that may affect the transmission.

[0044] In the present invention, the rated input power P of the input shaft assembly is 300 KW, and the rated continuous input speed n is 539 rpm. The technical parameters of the cylindrical gear pair are as follows: the center distance a is 583 mm, the normal module is 8 mm, and the tooth ratio of the output and input gears can be 97 / 43, 103 / 37, 86 / 54, etc., to adapt to various speed and load application requirements according to different tooth ratios; the helix angle is 9 - 14°, preferably 13°; the gear width is 30 mm, the accuracy grade is 6, and the material is 20CrMnMoA. The tooth part of the gear is carburized and quenched, the effective hardened layer depth is 1.2 - 1.6 mm, the tooth surface hardness is 58 - 62 HRC, the core hardness is 33 - 48 HRC, and the meshing backlash is 0.3 - 0.45 mm. The input gear on the input shaft meshes with the output gear to form a cylindrical gear pair.

[0045] In an actual scenario, when in use, power and rotational speed are input through the input shaft. Torque is transmitted to the connecting sleeve through the meshing of the gear on the input shaft and the output gear, and then the torque and rotational speed are transmitted to the output shaft through the spline pair of the connecting sleeve and the output shaft, and are transmitted from the middle of the output shaft to the flanges at both ends of the output shaft. And the large oil pump gear at the front end of the output shaft meshes with the oil pump gear in the lower housing, driving the oil pump gear to rotate so that the engine oil enters the oil passage through the filter, and transports the engine oil to the corresponding structure to lubricate the gearbox. The present invention uses lubricating oil to force-lubricate each bearing and gear pair, and seals the parts in contact with the outside to prevent foreign objects from entering and at the same time prevent the leakage of internal oil. The gearbox of the present invention is easy to install, has a strong bearing capacity, and is small in size, has high transmission performance, and can improve the transmission efficiency and reliability of the gearbox.

[0046] The above-described embodiments merely represent the specific implementation manners of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A transmission gearbox, characterized in that, It includes a box body structure, as well as a lubrication system, a breather assembly, an input shaft, and an output shaft disposed within the box body structure. The box body structure is composed of a lower box body, a middle box body, an upper box body, a fiber gasket, and a cover plate. The cover plate is covered on the upper box body through the fiber gasket; the lubrication system is disposed within the lower box body; the breather assembly is disposed on the middle box body and is used to balance the pressure inside and outside the gearbox; the output shaft is disposed at the connection between the lower box body and the middle box body, and the input shaft is disposed at the connection between the middle box body and the upper box body. The output shaft is respectively connected to the input shaft and the lubrication system. The output shaft is driven to rotate by connecting the motor through the input shaft, and the power is transmitted through the output shaft, and the lubrication system is driven to lubricate the transmission gearbox; the input shaft and the output shaft are disposed in parallel within the box body structure through bearing assemblies, and are respectively provided with an input gear and an output gear. The gear transmission is realized through the meshing of the input gear and the output gear; The output shaft is connected with a connecting sleeve through a spline, and the output gear is connected through the connecting sleeve; The bearing assembly includes a third bearing assembly. The third bearing assembly is disposed on both sides of the output gear of the output shaft to position the output gear; the third bearing assembly adopts a cylindrical roller bearing and a four-point ball bearing, and is provided with a bearing retainer ring, a bearing pad, and a bearing sleeve for fixedly sealing the bearing, so as to position the output gear through the third bearing assembly; 2. The transmission gearbox according to claim 1, characterized in that 3. The transmission gearbox according to claim 2, wherein Specifically, the third bearing assembly includes a bearing retainer ring, a bearing pad, bearing sleeve Ⅲ, cylindrical roller bearing Ⅲ, four-point ball bearing Ⅲ, and four-point ball bearing Ⅳ. Among them, the cylindrical roller bearing Ⅲ and the four-point ball bearing Ⅲ are disposed above the left side of the connecting sleeve, and a bearing pad is disposed between them; the four-point ball bearing Ⅳ is disposed above the right side of the connecting sleeve, and the cylindrical roller bearing Ⅲ, the four-point ball bearing Ⅲ, and the four-point ball bearing Ⅳ are fixed through the bearing sleeve Ⅲ and the bearing retainer ring.

4. The transmission gearbox according to claim 2, characterized in that, 5. The transmission gearbox according to claim 2, wherein, The bearing assembly includes a first bearing assembly, a second bearing assembly, a fourth bearing assembly, and a fifth bearing assembly. The first bearing assembly and the second bearing assembly are respectively disposed at both ends of the input shaft to support the input shaft; the fourth bearing assembly and the fifth bearing assembly are respectively disposed at both ends of the output shaft to support the output shaft. The first bearing assembly and the second bearing assembly respectively adopt a cylindrical roller bearing and / or a four-point ball bearing to install the input shaft; the fourth bearing assembly and the fifth bearing assembly respectively adopt a cylindrical roller bearing and / or a four-point ball bearing to install the output shaft. The first bearing assembly adopts a cylindrical roller bearing, and the second bearing assembly adopts a cylindrical roller bearing and a four-point ball bearing, and both are provided with an oil slinger, an end cover, a first bearing sleeve, a spacer ring, a plug, and a spacing ring for fixedly sealing the bearing. The fourth bearing assembly adopts a cylindrical roller bearing, and the fifth bearing assembly adopts a four-point ball bearing, and both are provided with a gland, a third bearing sleeve, a flange, and a flange cover plate. The bearing is installed and fixed through the gland and the third bearing sleeve. The flange is connected to the gland, and the flange pressing plate is disposed at the end of the output shaft, and the flange is installed and fixed through the flange pressing plate.

6. The transmission gearbox according to claim 1, wherein An oil pump large gear is arranged on the output shaft to drive the lubrication system; the lubrication system includes an oil pump gear, a pump seat, an oil sump assembly and a filter. The oil pump gear, the filter and the oil sump assembly are all arranged on the pump seat, connected to the oil pump large gear formed by the oil pump gear and the output shaft, and the lubrication system is fixed through the oil sump assembly.

7. The transmission gearbox according to claim 1, wherein An oil passage and an adjusting mechanism are further arranged in the transmission gearbox, and the amount of oil in the oil passage is adjusted through the adjusting mechanism.

8. The transmission gearbox according to claim 7, characterized in that, The adjusting mechanism includes a steel ball and a spring. When there is more oil in the oil passage, the steel ball is extruded to compress the spring on one side of the steel ball, so that the oil is discharged from the oil outlet passage to adjust the amount of oil in the oil passage.

9. The transmission gearbox according to claim 1, characterized in that, The input gear and the output gear are in interference fit, and the interference amount is 0.18 - 0.20 mm.

10. The transmission gearbox according to claim 1, characterized in that, The input gear and the output gear are meshed to form a cylindrical gear pair. The cylindrical gear pair is made of 20CrMnMoA material, the center distance a = 583 mm, the normal module is 8 mm, the tooth number ratio of the output gear to the input gear is 97 / 43, 103 / 37 or 86 / 54, the helix angle is 9 - 14°, and the gear width is 30 mm.

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