Transmission mechanism

Abstract

The utility model discloses a transmission mechanism, which solves the problems of large radial runout of an output shaft and a flange plate, few gears and difficulty in shifting high and low gears, and comprises an input shaft, an output shaft and an intermediate shaft, the input shaft and the intermediate shaft are arranged in parallel, and the input shaft and the output shaft are arranged in a straight line; a driving gear set and a gear shifting gear sleeve are arranged on the input shaft, and an output gear is arranged on the output shaft; a gear shifting gear sleeve and a driven gear set meshed with the driving gear set and the output gear are arranged on the intermediate shaft; and the input shaft, the output shaft and the intermediate shaft are supported by multiple bearings. Eight gears are arranged, high gears and low gears are alternately arranged, gear shifting operation is facilitated while the number of the gears is large, and radial run-out of the output flange plate is obviously reduced by additionally arranging a first-stage bearing support at the front end of the output flange plate.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile transmission parts, and specifically provides a novel transmission mechanism. Background Art

[0002] The transmission is a key component in the vehicle's transmission system. Its main function is to change the speed and torque from the engine, including changing the transmission ratio, achieving reverse driving, interrupting power transmission and achieving neutral gear, so that the vehicle can keep the engine working in the most efficient speed range under different driving conditions. The transmission not only affects the performance and fuel economy of the vehicle, but also directly affects the driver's driving experience and safety.

[0003] The conventional transmission has a constant mesh gear pair at the front end, and all gear shift mechanisms are on the input and output shafts. When there are more than five gears, the transmission has a long axial length and weak shaft stiffness, which is the biggest drawback. The rear-end constant mesh transmission shift mechanism can be separately arranged on the input shaft, output shaft and intermediate shaft, making the entire box axial layout compact, further shortening the axial length of the transmission, and thus significantly enhancing the shaft stiffness. When arranged in multiple gears, it has the advantages of good stiffness of two parallel shafts, low assembly noise, and strong load-bearing capacity.

[0004] However, in actual use of the vehicle, due to the long distance between the end face of the output flange of the rear constant mesh transmission and the last stage bearing, coupled with the heavy load on the transmission shaft, the output shaft diameter is limited, making it difficult to further strengthen the shaft stiffness, and the radial runout of the output shaft and flange is significantly amplified, resulting in oil leakage from the rear oil seal and easy damage to the last stage support bearing of the output shaft, which leads to other faults such as broken teeth in the transmission. In addition, most of the current automobile transmissions are five-speed or six-speed, with the high-speed gear in the front and the low-speed gear in the back, which makes it difficult to shift gears, and it is difficult to meet the needs of fast shifting in emergency situations. Utility Model Content

[0005] In order to solve the problem that the rear oil seal leaks oil and the final supporting bearing of the output shaft is easily damaged due to the large radial runout of the output shaft and the flange, thereby causing other faults such as broken teeth in the transmission, as well as the problem that the current transmission has few gears and it is difficult to shift between high and low gears, the utility model provides a transmission mechanism, which is provided with eight gears, and the high and low gears are arranged in an interspersed manner, so that the gear arrangement is orderly and convenient for shifting operations. At the same time, by adding a first-level bearing support at the front end of the output flange when designing the whole box, without increasing the output shaft diameter, the radial runout of the output flange is significantly reduced when the transmission is running at high speed with load, and the operation is stable, and the phenomenon of oil seal leakage and early damage to the final supporting bearing caused by the above reasons will no longer occur.

[0006] The specific scheme of the utility model is as follows.

[0007] A transmission mechanism comprises an input shaft and an output shaft, and also comprises an intermediate shaft, wherein the input shaft is arranged in parallel with the intermediate shaft, and the input shaft and the output shaft are arranged in a straight line; the input shaft is provided with a driving gear set and a shifting gear sleeve, and the output shaft is provided with an output gear; the intermediate shaft is provided with a shifting gear sleeve and a driven gear set meshing with the driving gear set and the output gear; the input shaft, the output shaft and the intermediate shaft are supported by multiple bearings.

[0008] The gear shifting function is realized through the cooperation of the input shaft, the output shaft, the gears and the shifting sleeve on the intermediate shaft. The power is transmitted from the input shaft to the driving gear, and then to the intermediate shaft through the meshing driving gear and the driven gear, and then to the output shaft through the meshing driven gear and the output gear, and then the power is output by the output shaft. The input shaft, the output shaft and the intermediate shaft are all supported by at least two bearings, which ensures the stability and transmission efficiency of the shaft and reduces the loss of the transmission caused by the unstable support of the shaft.

[0009] Furthermore, the output shaft is supported by three bearings, namely bearing E, bearing F and bearing G. The output shaft is supported by at least three bearings, which can improve the stability and transmission efficiency of the output shaft, and has higher stability than that supported by two bearings.

[0010] The bearing E is located at the front end of the output gear, the bearing F is located at the rear end of the output gear, an output flange is provided at the end of the output shaft, the bearing G is located at the front end of the output flange, and the bearing G is located at the rear end of the bearing F. The bearing E, the bearing F and the bearing G are arranged on the output shaft in sequence.

[0011] Furthermore, the output flange is fixedly mounted on the end of the output shaft by a nut, and the rear end face of the inner ring of the bearing G is fitted with the front end face of the output flange. By the bearing G being close to the front end face of the output flange, the distance from the end face of the transmission output flange to the last-stage bearing is reduced, thereby greatly reducing the radial runout of the output shaft and the output flange.

[0012] Furthermore, a bearing spacer is provided between the bearing G and the output shaft. The bearing spacer can help correctly locate the position of the bearing G installed on the output shaft, limit the axial movement of the bearing G, and adjust the axial clearance of the bearing to improve the stability of the output shaft.

[0013] Furthermore, an oil seal assembly is provided on the output flange, and a counting wheel is provided at the front end of the bearing G. The counting wheel is located between the bearing F and the bearing G, fixedly mounted on the output shaft, and rotates with the output shaft. The counting wheel can detect the rotation speed of the output shaft, thereby indirectly calculating the actual driving speed of the car, playing the role of detecting the vehicle speed, and can also record the rotation speed data of the output shaft, which can help technicians diagnose whether the transmission is faulty.

[0014] Furthermore, the transmission mechanism is provided with eight pairs of gear pairs: the gears in the driving gear set mesh with the gears in the driven gear set to form seven pairs of gear pairs; the output gear meshes with the gears in the driven gear set to form one pair of gear pairs.

[0015] The eight pairs of gear pairs are all in constant meshing. By switching the matching state between the shifting gear sleeve and the eight pairs of gear pairs, the power transmission state between the eight pairs of gear pairs and the shaft can be switched, thereby performing gear shifting.

[0016] Furthermore, the eight pairs of gear pairs constitute eight gears, and the high and low gears are arranged alternately: the first gear gear pair is adjacent to the reverse gear pair, the fourth gear gear pair is adjacent to the fifth gear gear pair and is located at the rear end of the reverse gear pair, the third gear gear pair and the second gear gear pair are adjacent to each other and are located at the rear end of the fifth gear gear pair, a seventh gear gear pair is provided at the rear end of the second gear gear pair, and a sixth gear gear pair is provided at the rear end of the seventh gear gear pair.

[0017] Through the above-mentioned arrangement order of the eight pairs of gear pairs, the high and low gears are arranged alternately, making the switching between high and low gears more convenient and quick. At the same time, the arrangement order of the gears is regular, which greatly reduces the time spent on switching the selected gears and improves the shifting speed in emergency situations, thereby improving safety.

[0018] Furthermore, a first gear and reverse gear shift gear sleeve is provided between the first gear gear pair and the reverse gear pair, a fourth and fifth gear shift gear sleeve is provided between the fourth gear gear pair and the fifth gear gear pair, a second and third gear shift gear sleeve is provided between the third gear gear pair and the second gear gear pair, and a sixth and seventh gear shift gear sleeve is provided between the seventh gear gear pair and the sixth gear gear pair; the fourth and fifth gear shift gear sleeve and the sixth and seventh gear shift gear sleeve are located on the input shaft, and the first gear and reverse gear shift gear sleeve and the second and third gear shift gear sleeve are located on the intermediate shaft.

[0019] The shifting gear sleeve can be connected to the gear at one end, or not connected to the gears at both ends. When the shifting gear sleeve is connected to the gear at one end, the gear pair where the gear is located transmits power; when the shifting gear sleeve is not connected to the gears at both ends, the gear pairs where the gears at both ends of the shifting gear sleeve are located do not transmit power.

[0020] Furthermore, the input shaft is supported by two bearings, bearing A and bearing B, and the intermediate shaft is supported by three bearings, bearing C, bearing D and bearing H; the bearings A and bearing C are located at the front end of the first gear pair, the bearings B and bearing D are located between the reverse gear pair and the fourth gear pair, and the bearing H is located at the rear end of the sixth gear pair. Both the input shaft and the intermediate shaft are supported by multiple bearings, and the positions of the bearings better ensure the stability of the input shaft and the intermediate shaft.

[0021] Furthermore, a gear seat is provided between the inner hole of the shift gear sleeve and the shaft, the gear seat is installed on the shaft through a spline, the shift gear sleeve is sleeved on the gear seat through a spline, and the shift gear sleeve is detachably connected to the gears at both ends through a spline; needle bearings are provided between the inner holes of the gears at both ends of the shift gear sleeve and the shaft, that is, the gears at both ends of the shift gear sleeve are sleeved on the shaft, and the remaining gears are installed on the shaft through a spline and rotate with the shaft. The shift gear sleeve can move forward and backward along the axial direction and rotate with the shaft. When the shift gear sleeve is connected to the gear at one end, the gear is connected to the shaft through the shift gear sleeve, so as to rotate with the shaft.

[0022] The utility model has the following beneficial effects.

[0023] After adopting the above scheme, the utility model has eight gears, including seven forward gears with different transmission ratios and one reverse gear, and there are many gears to choose from; and the high and low gears are arranged alternately, so that under the premise of a large number of gears and an orderly arrangement, it is convenient to perform gear shifting operations, which can meet the needs of rapid gear shifting in emergency situations, thereby improving driving experience and safety.

[0024] At the same time, compared with previous transmissions, by adding a first-level bearing support at the front end of the output flange during the design of the whole box, the radial runout of the output flange is significantly reduced when the transmission is running at high speed and load without increasing the output shaft diameter. The operation is smooth and there is no longer any oil seal leakage or early damage to the final support bearing caused by the large radial runout of the output flange. The quality of the transmission is comprehensively improved, thereby achieving a significant effect of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are merely embodiments of the present invention, and ordinary technicians in this field can obtain other drawings based on the provided drawings without creative work.

[0026] Figure 1 The utility model is a schematic structural diagram of a transmission mechanism.

[0027] Figure 2 The utility model is a schematic diagram of the structure of the input shaft and the output shaft of the transmission mechanism.

[0028] In the figure: 1. input shaft, 2. intermediate shaft, 3. output shaft, 4. bearing A, 5. bearing B, 6. first gear gear pair, 7. reverse gear pair, 8. fourth gear gear pair, 9. fifth gear gear pair, 10. third gear gear pair, 11. second gear gear pair, 12. seventh gear gear pair, 13. sixth gear gear pair, 14. bearing C, 15. bearing D, 16. first gear and reverse gear shift sleeve, 17. fourth and fifth gear shift sleeve, 18. second and third gear shift sleeve, 19. sixth and seventh gear shift sleeve, 20. output gear, 21. bearing E, 22. bearing F, 23. bearing G, 24. output flange, 25. nut, 26. oil seal assembly, 27. counting wheel, 28. spline, 29. bearing H. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] like Figure 1 The figure shows a schematic diagram of the structure of a transmission mechanism of the utility model, including an input shaft 1, an intermediate shaft 2 and an output shaft 3. The output shaft 3 is located in a straight line with the input shaft 1, and the end of the input shaft 1 is aligned with the head of the output shaft 3, and the intermediate shaft 2 is arranged in parallel with the input shaft 1, that is, the intermediate shaft 2 and the output shaft 3 are also arranged in parallel, and the intermediate shaft 2 is arranged above the input shaft 1 and the output shaft 3. The input shaft 1, the output shaft 3 and the intermediate shaft 2 are all supported by multiple bearings.

[0031] A driving gear set is installed on the input shaft 1, and the driving gear set includes a first gear driving gear, a reverse gear driving gear, a fourth gear driving gear, a fifth gear driving gear, a third gear driving gear, a second gear driving gear and a seventh gear driving gear, and the driving gears are arranged in sequence from the head end to the end on the input shaft 1 in the above order.

[0032] Two shifting gear sleeves are also installed on the input shaft 1, namely the fourth and fifth gear shifting gear sleeve 17 and the sixth and seventh gear shifting gear sleeve 19. Among them, the fourth and fifth gear shifting gear sleeve 17 is located between the fourth gear driving gear and the fifth gear driving gear, and the sixth and seventh gear shifting gear sleeve 19 is located at the rear end of the seventh gear driving gear and also at the end of the input shaft 1.

[0033] In addition, the input shaft 1 is supported by two bearings, namely bearing A4 and bearing B5. Among them, bearing A4 is located at the front end of the first gear driving gear, and bearing B5 is located between the reverse gear driving gear and the fourth gear driving gear.

[0034] A driven gear set is mounted on the intermediate shaft 2, and the driven gear set includes a first gear driven gear, a reverse gear driven gear, a fourth gear driven gear, a fifth gear driven gear, a third gear driven gear, a second gear driven gear, a seventh gear driven gear and a sixth gear driven gear, and the driven gears are arranged in sequence from the head end to the tail end on the intermediate shaft 2 in the above order. Among them, the first gear driven gear, the reverse gear driven gear, the fourth gear driven gear, the fifth gear driven gear, the third gear driven gear, the second gear driven gear and the seventh gear driven gear in the driven gear set are meshed one by one with the first gear driving gear, the reverse gear driving gear, the fourth gear driving gear, the fifth gear driving gear, the third gear driving gear, the second gear driving gear and the seventh gear driving gear in the driving gear set, respectively, to form seven pairs of gear pairs, namely, a first gear gear pair 6, a reverse gear gear pair 7, a fourth gear gear pair 8, a fifth gear gear pair 9, a third gear gear pair 10, a second gear gear pair 11 and a seventh gear gear pair 12. Arranging the gear pairs of high and low gears in the above order can make the operation process of switching between high and low gears more convenient and quick, avoiding the problem of difficulty in switching between high and low gears caused by arranging the gear pairs of high and low gears in the gear order in previous transmissions, and improving the driving experience and safety to a certain extent.

[0035] Two shifting gear sleeves are also installed on the intermediate shaft 2, namely, the first gear reverse gear shifting gear sleeve 16 and the second and third gear shifting gear sleeve 18. Among them, the first gear reverse gear shifting gear sleeve 16 is located between the first gear driven gear and the reverse gear driven gear, and the second and third gear shifting gear sleeve 18 is located between the third gear driven gear and the second gear driven gear.

[0036] In addition, the intermediate shaft 2 is supported by three bearings, namely, bearing C14, bearing D15 and bearing H29. Among them, bearing C14 is located at the front end of the first gear driven gear, that is, the head end of the intermediate shaft 2, bearing D15 is located between the reverse gear driven gear and the fourth gear driven gear, and bearing H29 is located at the rear end of the sixth gear gear pair, that is, the end of the intermediate shaft 2.

[0037] like Figure 2 The schematic diagram of the structure of the input shaft 1 and the output shaft 3 of a transmission mechanism of the utility model. An output gear 20 is installed on the output shaft 3, and the output gear 20 is meshed with the sixth gear driven gear on the intermediate shaft 2 to form a pair of gear pairs, namely the sixth gear gear pair 13.

[0038] The utility model has eight gears, including seven forward gears with different transmission ratios and one reverse gear, with many selectable gears; and high and low gears are arranged in an interspersed manner, so that under the premise of a large number of gears and an orderly arrangement, it is convenient to perform gear shifting operations, which can meet the needs of rapid gear shifting in emergency situations, thereby improving driving experience and safety.

[0039] The output shaft 3 is supported by three bearings, namely, bearing E21, bearing F22 and bearing G23. Compared with the output shaft of the previous transmission, one more bearing G23 is provided. The bearing E21 is located at the front end of the output gear 20, and the bearing F22 is located at the rear end of the output gear 20.

[0040] An output flange 24 is provided at the end of the output shaft 3, and the output flange 24 is fixedly mounted at the end of the output shaft 3 by a nut 25. The bearing G23 is located at the front end of the output flange 24, and the rear end face of the inner ring of the bearing G23 fits the front end face of the output flange 24. The bearing G is closely attached to the front end face of the output flange, thereby reducing the distance from the end face of the transmission output flange to the last-stage bearing, thereby reducing the radial runout of the output shaft and the output flange. An oil seal assembly 26 is provided between the bearing G and the output flange, that is, the oil seal assembly 26 is fixedly mounted on the output flange 24.

[0041] In addition, a bearing spacer may be provided between the bearing G23 and the output shaft 3. The bearing spacer may help to correctly locate the position of the bearing G installed on the output shaft, limit the axial movement of the bearing G, and adjust the axial clearance of the bearing to improve the stability of the output shaft.

[0042] In addition, each bearing in the transmission can be any type of bearing, such as a cylindrical roller bearing, a ball bearing, a spherical bearing or a tapered bearing, etc. The technical feature of adding a first-level bearing support at the front end of the output flange can also be applied to any type of transmission, including a two-axis transmission, a three-axis transmission and a multi-axis transmission, etc.

[0043] Compared with previous transmissions, by adding a first-stage bearing support at the front end of the output flange during the design of the entire transmission, the radial runout of the output flange is significantly reduced when the transmission is operating at high speed and under load without increasing the output shaft diameter. The operation is smooth and there is no oil seal leakage or early damage to the final support bearing caused by the above-mentioned reasons. The quality of the transmission is comprehensively improved, thereby achieving a significant effect of reducing costs and increasing efficiency.

[0044] In addition, a counting wheel 27 is installed between the bearing F22 and the bearing G23. The counting wheel 27 is fixedly installed on the output shaft 3 and rotates with the output shaft 3. The counting wheel 27 can detect the rotation speed of the output shaft 3, thereby indirectly calculating the actual driving speed of the car, playing the role of detecting the vehicle speed, and can also record the speed data of the output shaft, which can help technicians diagnose whether the transmission is faulty.

[0045] The input shaft 1, the intermediate shaft 2 and the output shaft 3 are all provided with splines 28. A gear seat is provided between the inner hole of the shift gear sleeve and the middle of the shaft. The gear seat is installed on the shaft through splines, and the shift gear sleeve is sleeved on the gear seat through splines. The shift gear sleeve is detachably connected to the gears at both ends through splines; needle bearings are provided between the inner holes of the gears at both ends of the shift gear sleeve and the middle of the shaft, that is, the gears at both ends of the shift gear sleeve are loosely sleeved on the shaft, and the remaining gears are fixedly installed on the shaft through splines 28. The shift gear sleeve can move forward and backward along the axial direction and rotate with the shaft on which it is located. When the shift gear sleeve is connected to the gear at one end, the gear is connected to the shaft on which it is located through the shift gear sleeve, and thus rotates with the shaft on which it is located.

[0046] Since the shifting gear sleeve is located between the two idle gears on the shaft, when the shifting gear sleeve is not in contact with the gears at both ends, the gears at both ends do not rotate with the shaft. When the shifting gear sleeve moves to the gear at one end, the shifting gear sleeve can be connected and locked with the gear, that is, the gear is connected to the shaft through the shifting gear sleeve and rotates with the shaft. In addition, the sixth and seventh gear shifting gear sleeve 19 can be moved to the rear end to connect the input shaft 1 and the output shaft 3 as one.

[0047] Input shaft 1 inputs power from the engine, and the rotation of input shaft 1 drives the gear fixed on the input shaft to rotate. When all the shift sleeves are not connected to the gears and the sixth and seventh gear shift sleeves are not connected to the output shaft, the transmission is in neutral, and power cannot be transmitted from input shaft 1 to output shaft 3, that is, the power transmission is disconnected, which is very important for engine starting, parking, towing or short parking on a slope. It can prevent the vehicle from moving unexpectedly, save fuel and reduce wear. In addition, the neutral state is convenient for shifting. As an intermediate state in the shifting process, the neutral state makes the shift from one gear to another smoother, reducing the impact of directly shifting from a high gear to a low gear or vice versa.

[0048] When one of the shift gears is connected to the gear at one end, the gear pair where the gear is located works, and the power of the input shaft 1 is transmitted to the intermediate shaft 2 through the gear pair of the gear position, and then the power of the intermediate shaft is transmitted to the output shaft 3 through the sixth gear gear pair 13, and the output shaft 3 then transmits the power through the output flange 24 fixedly installed at its end. In the process of power transmission between shafts, its transmission ratio is related to the diameter ratio of the driving gear and the driven gear of the gear pair of the power transmission gear position, so the diameter ratio of the driving gear and the driven gear of the gear pairs of different gear positions is different.

[0049] For example, if the transmission is to work in the first gear, the first gear reverse shift gear sleeve 16 is moved toward the first gear gear pair 6, so that the first gear reverse shift gear sleeve 16 is connected to the first gear driven gear, so that the first gear gear pair 6 works. The input shaft 1 inputs power from the engine, and the rotation of the input shaft 1 drives the first gear driving gear fixedly mounted on the input shaft to rotate; since the first gear driving gear in the first gear gear pair 6 is meshed with the first gear driven gear, the first gear driven gear rotates with the first gear driving gear; and the first gear driven gear is connected to the intermediate shaft 2 through the first gear reverse shift gear sleeve, so the intermediate shaft 2 rotates with the first gear driven gear; the sixth gear driven gear is fixedly mounted on the intermediate shaft 2, so that the sixth gear driven gear rotates with the intermediate shaft 2; the sixth gear driven gear is meshed with the output gear 20, and the output gear 20 rotates with the sixth gear driven gear; the output gear 20 is fixedly mounted on the output shaft 3, so that the output shaft 3 rotates with the output gear 20. The above is the transmission process of power from the input shaft 1 to the output shaft 3 when the transmission works in the first gear. After the power is transmitted to the output shaft 3, the output shaft 3 transmits the power through the output flange 24 fixedly installed at its end.

[0050] If the transmission is to operate in reverse gear, second gear, third gear, fourth gear, fifth gear or seventh gear, its power transmission process is similar to the power transmission process when the above-mentioned transmission operates in first gear. It is only necessary to adjust the position of the reverse gear sleeve and connect the shift gear sleeve corresponding to the required gear with the gear pair of the required gear to switch the gear.

[0051] If the transmission is to work in the sixth gear, the sixth and seventh gear shift gear sleeve 19 needs to be moved to the rear end until the sixth and seventh gear shift gear sleeve 19 connects the input shaft 1 and the output shaft 3 as a whole, and the power is directly transmitted from the input shaft 1 to the output shaft 3. At this time, the transmission ratio is 1. At this time, the output gear 20 rotates with the output shaft 3, and because the sixth gear driven gear is meshed with the output gear 20, the sixth gear driven gear rotates with the output gear 20.

[0052] The utility model has eight gears, including seven forward gears with different transmission ratios and one reverse gear. There are many selectable gears, and a neutral gear is also provided. The high and low gears are arranged in an interspersed manner, so that the gear shifting operation is convenient under the premise of a large number of gears and an orderly arrangement. It can meet the needs of fast gear shifting in emergency situations, thereby improving the driving experience and safety.

[0053] At the same time, compared with previous transmissions, by adding a first-level bearing support at the front end of the output flange during the design of the whole box, the radial runout of the output flange is significantly reduced when the transmission is running at high speed and load without increasing the output shaft diameter. The operation is smooth and there is no oil seal leakage or early damage to the final support bearing caused by the above reasons. The quality of the transmission is comprehensively improved, thereby achieving a significant effect of reducing costs and increasing efficiency.

[0054] The above description is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural transformation made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A transmission mechanism, comprising an input shaft and an output shaft, characterized in that: It also includes an intermediate shaft, the input shaft is arranged in parallel with the intermediate shaft, and the input shaft and the output shaft are arranged in a straight line; The input shaft is provided with a driving gear set and a shift gear sleeve, and the output shaft is provided with an output gear; The intermediate shaft is provided with a shifting gear sleeve and a driven gear set meshing with the driving gear set and the output gear; The input shaft, the output shaft and the intermediate shaft are supported by multiple bearings.

2. The transmission mechanism according to claim 1, characterized in that: The output shaft is supported by three bearings, namely bearing E, bearing F and bearing G; The bearing E is located at the front end of the output gear, the bearing F is located at the rear end of the output gear, an output flange is provided at the end of the output shaft, and the bearing G is located at the front end of the output flange.

3. The transmission mechanism according to claim 2, characterized in that: The output flange is fixedly mounted on the end of the output shaft by means of a nut, and the rear end surface of the inner ring of the bearing G is in contact with the front end surface of the output flange.

4. The transmission mechanism according to claim 3, characterized in that: A bearing spacer is provided between the inner hole of the bearing G and the output shaft.

5. The transmission mechanism according to claim 2 or 3, characterized in that: An oil seal assembly is arranged on the output flange, and a counting wheel is arranged at the front end of the bearing G.

6. The transmission mechanism according to claim 1, characterized in that: There are eight pairs of gear pairs: The gears in the driving gear set mesh with the gears in the driven gear set to form seven pairs of gear pairs; The output gear meshes with the gear in the driven gear set to form a pair of gear pairs.

7. The transmission mechanism according to claim 6, characterized in that: The eight pairs of gear pairs are eight gears, with high and low gears arranged alternately: The first gear gear pair is arranged adjacent to the reverse gear pair, the fourth gear gear pair is arranged adjacent to the fifth gear gear pair and is located at the rear end of the reverse gear pair, the third gear gear pair and the second gear gear pair are arranged adjacent to each other and are located at the rear end of the fifth gear gear pair, a seventh gear gear pair is arranged at the rear end of the second gear gear pair, and a sixth gear gear pair is arranged at the rear end of the seventh gear gear pair.

8. The transmission mechanism according to claim 7, characterized in that: A first gear and reverse gear shift sleeve is disposed between the first gear gear pair and the reverse gear pair, a fourth and fifth gear shift sleeve is disposed between the fourth gear gear pair and the fifth gear gear pair, a second and third gear shift sleeve is disposed between the third gear gear pair and the second gear gear pair, and a sixth and seventh gear shift sleeve is disposed between the seventh gear gear pair and the sixth gear gear pair; The fourth and fifth gear shift gear sleeves and the sixth and seventh gear shift gear sleeves are located on the input shaft, and the first gear reverse gear shift gear sleeve and the second and third gear shift gear sleeves are located on the intermediate shaft.

9. The transmission mechanism according to claim 7, characterized in that : The input shaft is supported by two bearings, bearing A and bearing B, and the intermediate shaft is supported by three bearings, bearing C, bearing D and bearing H; The bearing A and the bearing C are located at the front end of the first gear pair, the bearing B and the bearing D are located between the reverse gear pair and the fourth gear pair, and the bearing H is located at the rear end of the sixth gear pair.

10. The transmission mechanism according to claim 1 or 8, characterized in that: A gear seat is provided between the inner hole of the shift gear sleeve and the shaft, the gear seat is installed on the shaft through a spline, the shift gear sleeve is sleeved on the gear seat through a spline, and the shift gear sleeve is detachably connected to the gears at both ends through the spline; Needle bearings are arranged between the inner holes of the gears at both ends of the shifting gear sleeve and the shaft, and the remaining gears are mounted on the shaft through splines.

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