Active lubrication pure electric four-gear helical tooth gearbox with front auxiliary box

Abstract

The utility model provides an active lubrication pure electric four-gear helical tooth gearbox with a front auxiliary box, which facilitates reasonable and convenient arrangement of a main box mechanism, and is good in transmission stability, low in noise and good in driving and riding comfort. The front auxiliary box comprises an auxiliary box shell, and an auxiliary box input shaft set and the input end of a main box input shaft are arranged in the auxiliary box shell. The main box comprises a main box shell, and an output end of the main box input shaft, an output shaft, a first short intermediate shaft, a second long intermediate shaft and an oil pump are arranged in the main box shell; the front auxiliary box is arranged corresponding to the power input end side of the main box, the auxiliary box input shaft set comprises at least two auxiliary box input shafts, and each auxiliary box input shaft protrudes out of the auxiliary box shell and is used for being externally connected with power input. Each auxiliary box input shaft is connected with an auxiliary box driven gear on the main box input shaft in a meshed mode through an auxiliary box input gear.

Description

An actively lubricated pure electric four-speed helical gearbox with a front auxiliary gearbox Technical Field

[0001] This utility model relates to the technical field of transmission structure, specifically to an active lubrication pure electric four-speed helical gear transmission with a front auxiliary gearbox. Background Technology

[0002] Heavy-duty trucks consume vast amounts of petroleum and are among the largest sources of CO2 emissions in the transportation sectors of major economies worldwide. Diesel vehicles are also a major source of air pollution. Therefore, research on energy-saving and emission-reduction technologies for heavy-duty trucks is of great significance for reducing my country's petroleum consumption and greenhouse gas emissions, decreasing dependence on imported oil, and protecting the environment. Pure electric mode is currently the most reasonable energy mode for reliably reducing emissions from heavy-duty trucks. However, due to the differences between heavy-duty trucks and ordinary passenger cars—heavy loads and complex operating conditions—a gearbox is still necessary to ensure reduced energy consumption and reliable, safe operation. Existing gearboxes directly connect power to the input shaft of the main gearbox. When dual-motor power input is used, power coupling must be completed in the main gearbox. In actual operation, this power coupling mechanism occupies a large space in the main gearbox, resulting in a relatively compact arrangement of the drive shaft and corresponding mechanisms. Furthermore, the gear meshing in the main gearbox of existing gearboxes is all spur gear meshing, leading to relatively poor transmission smoothness, high noise, and reduced driving comfort. Therefore, there is an urgent need to develop a gearbox that allows for a reasonable and convenient arrangement of the main gearbox mechanism, good transmission smoothness, low noise, and improved driving comfort. Summary of the Invention

[0003] To address the aforementioned issues, this utility model provides an actively lubricated pure electric four-speed helical gearbox with a front auxiliary gearbox, which facilitates the reasonable and convenient arrangement of the main gearbox mechanism, and offers good transmission smoothness, low noise, and good driving comfort.

[0004] A fully electric four-speed helical gearbox with a front auxiliary gearbox, characterized in that it comprises:

[0005] The front auxiliary box includes an auxiliary box housing, and the auxiliary box housing is provided with an auxiliary box input shaft assembly and an input end of the main box input shaft;

[0006] And the main housing, which includes a main housing shell, wherein the main housing shell is provided with an output end of the main housing input shaft, an output shaft, a first short intermediate shaft, a second long intermediate shaft, and an oil pump;

[0007] The front auxiliary box is provided on the power input end side corresponding to the main box. The auxiliary box input shaft group includes at least two auxiliary box input shafts. Each auxiliary box input shaft protrudes out of the auxiliary box housing and is used for external power input. Each auxiliary box input shaft is meshed with the auxiliary box driven gear on the main box input shaft through an auxiliary box input gear.

[0008] The main input shaft and output shaft inside the main housing are coaxially arranged.

[0009] The first short intermediate shaft and the second long intermediate shaft are alternately arranged at corresponding positions of the main gearbox input shaft and output shaft. The input shaft transmits power to the output shaft through the shift assembly, the first short intermediate shaft, and the second long intermediate shaft. The first short intermediate shaft is also connected to the input end of the oil pump. The oil pump pumps the lubricating oil located at the bottom of the main gearbox housing into the main gearbox housing and the auxiliary gearbox housing.

[0010] All gears inside the main housing and the auxiliary housing are helical gears.

[0011] Its further features are:

[0012] The second long intermediate shaft is equipped with a spline structure, and a power take-off unit is matched as needed for external power take-off;

[0013] The auxiliary gearbox input shaft assembly includes two auxiliary gearbox input shafts, which are shafts with the same structure and fitted with the same auxiliary gearbox input gear.

[0014] The auxiliary housing and the main housing share a common intermediate end plate, which makes the entire gearbox relatively lightweight.

[0015] The main input shaft is located at the center of the intermediate end plate. The auxiliary input shaft is located at two corresponding positions on one diagonal of the intermediate end plate corresponding to the main input shaft. The first short intermediate shaft and the second long intermediate shaft are located at two corresponding positions on the other diagonal of the intermediate end plate corresponding to the main input shaft. The first short intermediate shaft is located at a relatively high position to ensure the reasonable and reliable setting of the oil pump.

[0016] The gears mounted on the first short intermediate shaft and the second long intermediate shaft have the same spacing and axial position. The first short intermediate shaft and the second long intermediate shaft are sequentially fixed with an intermediate shaft constant mesh gear, an intermediate shaft third gear, an intermediate shaft second gear, and an intermediate shaft first gear.

[0017] The end of the main input shaft and the docking position of the output shaft are provided with a main input shaft head bearing and a third and fourth gear hub sleeve. When the third and fourth gear hub sleeve is docked with the main input shaft and the output shaft, the output shaft outputs power in fourth gear.

[0018] The output end of the main gearbox input shaft is fixedly fitted with a main gearbox input shaft gear, and the main gearbox input shaft gear meshes with two sets of intermediate shaft constant mesh gears.

[0019] The output shaft is sequentially fitted with an output shaft third gear, an output shaft second gear, a first and second gear hub sleeve, and an output shaft first gear. The output shaft third gear meshes with two sets of intermediate shaft third gears. The output shaft second gear meshes with the intermediate shaft second gear. The output shaft first gear meshes with the intermediate shaft first gear. When the third and fourth gear hub sleeves engage with the output shaft third gear, the output shaft outputs power in third gear. When the first and second gear hub sleeves engage with the output shaft first gear, the output shaft outputs power in first gear. When the first and second gear hub sleeves engage with the output shaft second gear, the output shaft outputs power in second gear.

[0020] Both the main housing and the auxiliary housing are made of aluminum, making them lightweight overall.

[0021] With this invention, each input shaft of the auxiliary gearbox input shaft group is externally connected to a power source. The power is then coupled through the corresponding auxiliary gearbox input gear meshing with the auxiliary gearbox driven gear on the main gearbox input shaft. This increases the space inside the main gearbox housing, making the component setup inside the main gearbox housing relatively simple and convenient. Furthermore, since all gears in the main gearbox housing and the auxiliary gearbox housing are helical gears, the transmission is smooth, the noise is low, and the ride comfort is good. In addition, since the first short intermediate shaft is also connected to the input end of the oil pump, the oil pump pumps the lubricating oil located at the bottom of the main gearbox housing into the main gearbox housing and the auxiliary gearbox housing, so that the lubricating oil actively lubricates the components inside the main gearbox housing and the auxiliary gearbox housing in all directions, improving the lubrication efficiency. Attached Figure Description

[0022] Figure 1 is a schematic block diagram of a specific embodiment of the present utility model;

[0023] Figure 2 is a front view of the middle end plate of a specific embodiment of this utility model;

[0024] Figure 3 is a top view of the assembly between the intermediate end plate and each shaft in a specific embodiment of this utility model. Detailed Implementation

[0025] A fully electric four-speed helical gearbox with active lubrication and a front auxiliary gearbox, as shown in Figures 1-3, includes a front auxiliary gearbox 100 and a main gearbox 200.

[0026] The front auxiliary box 100 includes an auxiliary box housing 101, inside which are disposed the auxiliary box input shaft assembly and the input end of the main box input shaft 25.

[0027] The main housing 200 includes a main housing 201, and the main housing 201 is provided with the output end of the main housing input shaft 25, the output shaft 12, the first short intermediate shaft 6, the second long intermediate shaft 14, and the oil pump 26.

[0028] The front auxiliary box 100 is provided on the power input end side corresponding to the main box 200. The auxiliary box input shaft group includes at least two auxiliary box input shafts. Each auxiliary box input shaft 1 protrudes outward from the auxiliary box housing 101 and is used for external power input. Each auxiliary box input shaft 1 is meshed with the auxiliary box driven gear 23 on the main box input shaft 25 through the auxiliary box input gear 3.

[0029] The main input shaft 25 and output shaft 12 inside the main housing 201 are coaxially arranged;

[0030] The first short intermediate shaft 6 and the second long intermediate shaft 14 are staggered at corresponding positions on the main gearbox input shaft 25 and output shaft 12. The input shaft 12 transmits power to the output shaft through the shift assembly, the first short intermediate shaft 6, and the second long intermediate shaft 14. The first short intermediate shaft 6 is also connected to the input end of the oil pump 26. The oil pump 26 pumps the lubricating oil located at the bottom of the main gearbox housing 201 into the internal oil passages of the main gearbox housing 201 and the auxiliary gearbox housing 101 to perform sufficient self-lubrication of each shaft, bearing, and gear.

[0031] All gears inside the main housing 201 and the auxiliary housing 101 are helical gears.

[0032] In a specific embodiment, a spline structure is provided on the second long intermediate shaft 14, and a power take-off device is matched as needed for external power take-off.

[0033] The auxiliary gearbox input shaft assembly includes two auxiliary gearbox input shafts 1. The two auxiliary gearbox input shafts 1 are shafts with the same structure and are fitted with the same auxiliary gearbox input gear 3.

[0034] The auxiliary gearbox housing 101 and the main gearbox housing 201 share a common intermediate end plate 27, which makes the entire gearbox relatively lightweight. In a specific embodiment, the intermediate end plate 27 is an auxiliary gearbox connecting plate, and corresponding bearing holes are provided on both sides of the auxiliary gearbox connecting plate to position the shafts in the main gearbox housing 201 and the auxiliary gearbox housing 101 respectively.

[0035] The main input shaft 25 is set at the center of the intermediate end plate 27. The auxiliary input shaft 1 is set at two corresponding positions on the diagonal of the intermediate end plate 27 corresponding to the input shaft. The first short intermediate shaft 6 and the second long intermediate shaft 14 are set at two corresponding positions on the other diagonal of the intermediate end plate 27 corresponding to the main input shaft 25. The first short intermediate shaft 6 is located on the relatively high side to ensure the reasonable and reliable setting of the oil pump 26.

[0036] The gears mounted on the first short intermediate shaft 6 and the second long intermediate shaft 14 have the same spacing and axial position. The intermediate shaft constant mesh gear 5, the intermediate shaft third gear 7, the intermediate shaft second gear 8, and the intermediate shaft first gear 9 are sequentially fixed on the first short intermediate shaft 6 and the second long intermediate shaft 14.

[0037] The end of the main input shaft 25 and the docking position of the output shaft 12 are provided with a main input shaft head bearing 19 and a third and fourth gear hub sleeve 18. When the third and fourth gear hub sleeve 18 docks with the main input shaft 25 and the output shaft 12, the output shaft 12 outputs power in fourth gear.

[0038] The output end of the main gearbox input shaft 25 is fixedly fitted with a main gearbox input shaft gear 20, which meshes with two sets of intermediate shaft constant mesh gears 5.

[0039] The output shaft 12 is sequentially fitted with an output shaft third gear 17, an output shaft second gear 16, a first and second gear hub sleeve 15, and an output shaft first gear 13. The output shaft third gear 17 meshes with two sets of intermediate shaft third gears 7. The output shaft second gear 16 meshes with and connects to the intermediate shaft second gear 8. The output shaft first gear 13 meshes with and connects to the intermediate shaft first gear 9. When the third and fourth gear hub sleeve 18 is engaged with the output shaft third gear 17, the output shaft 12 outputs power in third gear. When the first and second gear hub sleeve 15 is engaged with the output shaft first gear 13, the output shaft 12 outputs power in first gear. When the first and second gear hub sleeve 15 is engaged with the output shaft second gear 16, the output shaft 12 outputs power in second gear.

[0040] Both the main housing 201 and the auxiliary housing 101 are made of aluminum, making them lightweight overall.

[0041] In a specific embodiment, the two auxiliary input shafts 1 and the first short intermediate shaft 6 and the second long intermediate shaft 14 are structurally staggered and arranged in an "X" shape relative to the main input shaft 25. The auxiliary input shaft 1 is fitted with the auxiliary housing 101 by the auxiliary input shaft front bearing 2 and the auxiliary input shaft rear bearing 22. The first short intermediate shaft 6 and the second long intermediate shaft 14 are fitted with the main housing 201 by the intermediate shaft front bearing 4 and the intermediate shaft rear bearing 10, respectively. The auxiliary housing 101 and the main housing 201 are fitted with the intermediate end plate 27 or are independent housings fitted with a support plate.

[0042] In specific implementation, the front end of the auxiliary gearbox input shaft 1 is connected to an external power motor via a spline as a power input; the auxiliary gearbox input shaft gear 3 meshes with the auxiliary gearbox driven gear 23, and the two power inputs are concentrated and transmitted to the auxiliary gearbox driven gear 23 via the auxiliary gearbox input shaft gear 3. The auxiliary gearbox driven gear 23 is connected to the main gearbox input shaft 25 via an internal spline. The main gearbox input shaft head bearing 19, the main gearbox input shaft front bearing 24, and the main gearbox input shaft rear bearing 21 ensure the coaxiality of the main gearbox input sub-assembly and the main gearbox shaft system, and also play a load-bearing role.

[0043] The driven gear 23 of the auxiliary gearbox transmits power to the input shaft gear 20 of the main gearbox. The input shaft gear 20 of the main gearbox, which is integrally formed with the input shaft 25 of the main gearbox, meshes with the constant mesh gear 5 of the intermediate shaft. The constant mesh gear 5, the third gear 7, the second gear 8, and the first gear 9 of the intermediate shaft are sequentially fixed on the first short intermediate shaft 6 and the second long intermediate shaft 14, respectively, and are connected to the input shaft gear 20 of the main gearbox, the third gear 17 of the output shaft, the second gear 16 of the output shaft, and the first gear 13 of the output shaft for power transmission. The first short intermediate shaft 6 and the second long intermediate shaft 14 are supported by bearings at the front and rear, and are connected to the housing for limiting. The rear end of the first short intermediate shaft 6 is connected to the inner rotor of the oil pump. When the first short intermediate shaft 6 is running, it drives the oil pump 26 to work, which delivers the lubricating oil inside the gearbox to the oil pipes and oil lines to ensure sufficient lubrication between the bearings and gears of the auxiliary gearbox and the main gearbox.

[0044] The output shaft 12 is fixedly connected to the first and second gear hub sleeves 15 and the third and fourth gear hub sleeves 18 via splines. The first gear 13, the second gear 16, and the third gear 17 of the output shaft are loosely fitted on the output shaft 12. The gears are positioned by gear spacers. A long key is inserted between the output shaft 12 and the spacers to prevent the spacers from rotating. The front end of the output shaft 12 is connected to the aforementioned input shaft head bearing 19, and the rear end is connected to the outer housing via the output shaft bearing 11 to ensure the support and positioning of the output shaft 12.

[0045] The auxiliary gearbox assembly is designed with only one pair of gears meshing, mainly for speed reduction and torque increase, and does not operate for gear shifting. It only transmits external power to the input shaft of the main gearbox.

[0046] Principles and gear transmission in specific embodiments

[0047] The first gear and first and second gear hub sleeves 15 move to the right and engage with the first gear 13 on the output shaft. Power input - auxiliary gearbox input shaft, auxiliary gearbox input shaft gear - auxiliary gearbox driven wheel - main gearbox input shaft - main gearbox input shaft gear - intermediate shaft constant mesh gear - intermediate shaft - intermediate shaft first gear gear, output shaft first gear gear - first and second gear hub sleeves - output shaft;

[0048] The second gear and first / second gear hub sleeve 15 move to the left and engage with the second gear 16 on the output shaft. Power input - auxiliary gearbox input shaft, auxiliary gearbox input shaft gear - auxiliary gearbox driven wheel - main gearbox input shaft - main gearbox input shaft gear - intermediate shaft constant mesh gear - intermediate shaft - intermediate shaft second gear - output shaft second gear - first / second gear hub sleeve - output shaft;

[0049] The third and fourth gear hub sleeves 18 move to the right and engage with the third gear 17 on the output shaft. Power input - auxiliary gearbox input shaft, auxiliary gearbox input shaft gear - auxiliary gearbox driven wheel - main gearbox input shaft - main gearbox input shaft gear - intermediate shaft constant mesh gear - intermediate shaft - intermediate shaft third gear - output shaft third gear - third and fourth gear hub sleeves - output shaft;

[0050] The fourth gear and third and fourth gear hub sleeves 18 move to the left and engage with the input shaft 25. The fourth gear is a direct drive, and the power input is directly transmitted to the output shaft through the input shaft.

[0051] Its design features long and short intermediate shafts. The short intermediate shaft connects to the oil pump and drives the oil pump to run, while the long intermediate shaft is designed with splines to accommodate a power take-off unit for external power extraction.

[0052] Its beneficial effects are as follows:

[0053] The helical gear design results in smoother operation, reduced noise, and improved comfort. Furthermore, considering the axial force of the helical gears, the input shaft gear and the gears on the second shaft are left-handed, while the gear on the intermediate shaft is right-handed.

[0054] A secondary gearbox structure is added to the input end of the gearbox. The secondary gearbox is designed with dual input shafts, and the shaft system is arranged with helical gear shafts that intersect with the intermediate shaft system of the main gearbox, thus shortening the axial distance.

[0055] The design incorporates an oil pump for active lubrication, with corresponding oil circuits between the housing and shaft system to fully lubricate all contact surfaces and rotating parts. The oil passages from the main housing are extended to the auxiliary housing, lubricating the shaft system of the main housing before entering the auxiliary housing for lubrication, thus forming a cycle.

[0056] The gear hub and shift engagement gear are eliminated, and the design is simplified to a gear hub sliding sleeve, which reduces the number of components, improves reliability, and facilitates subsequent maintenance.

[0057] The casing is made of aluminum alloy, which reduces weight and is equipped with advanced processing technology, which helps control costs.

[0058] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fully electric four-speed helical gearbox with active lubrication and a front auxiliary gearbox, characterized in that, It includes: a front auxiliary gearbox, which includes an auxiliary gearbox housing, the auxiliary gearbox housing having an auxiliary gearbox input shaft assembly and an input end of a main gearbox input shaft inside the auxiliary gearbox housing; and a main gearbox, which includes a main gearbox housing, the main gearbox housing having an output end of a main gearbox input shaft, an output shaft, a first short intermediate shaft, a second long intermediate shaft, and an oil pump inside the main gearbox housing; the front auxiliary gearbox is disposed on the power input end side corresponding to the main gearbox, the auxiliary gearbox input shaft assembly includes at least two auxiliary gearbox input shafts, each of the auxiliary gearbox input shafts protruding out of the auxiliary gearbox housing for external power input, and each of the auxiliary gearbox input shafts is connected to an auxiliary gearbox input gear. The auxiliary gearbox driven gear is meshed with the input shaft of the main gearbox; the input shaft and output shaft of the main gearbox are coaxially arranged inside the main gearbox housing; the first short intermediate shaft and the second long intermediate shaft are alternately arranged at corresponding positions of the input shaft and output shaft of the main gearbox, and the input shaft transmits power to the output shaft through the shift assembly, the first short intermediate shaft and the second long intermediate shaft. The first short intermediate shaft is also connected to the input end of the oil pump, and the oil pump pumps the lubricating oil located at the bottom of the main gearbox housing into the main gearbox housing and the auxiliary gearbox housing; all gears in the main gearbox housing and the auxiliary gearbox housing are helical gears.

2. The actively lubricated pure electric four-speed helical gearbox with a front auxiliary gearbox according to claim 1, characterized in that: The second long intermediate shaft is equipped with a spline structure, and a power take-off unit is matched as needed for external power take-off.

3. The actively lubricated pure electric four-speed helical gearbox with a front auxiliary gearbox according to claim 1, characterized in that: The auxiliary gearbox input shaft assembly includes two auxiliary gearbox input shafts, which are shafts with the same structure and fitted with the same auxiliary gearbox input gear.

4. The actively lubricated pure electric four-speed helical gearbox with a front auxiliary gearbox according to claim 1, characterized in that: The auxiliary housing and the main housing share a common intermediate end plate.

5. A fully electric four-speed helical gearbox with a front auxiliary gearbox according to claim 4, characterized in that: The main input shaft is located at the center of the intermediate end plate. The auxiliary input shaft is located at two corresponding positions on the diagonal of the intermediate end plate corresponding to the main input shaft. The first short intermediate shaft and the second long intermediate shaft are located at two corresponding positions on the other diagonal of the intermediate end plate corresponding to the main input shaft. The first short intermediate shaft is located at a relatively high position.

6. The actively lubricated pure electric four-speed helical gearbox with a front auxiliary gearbox according to claim 1, characterized in that: The gears mounted on the first short intermediate shaft and the second long intermediate shaft have the same spacing and axial position. The first short intermediate shaft and the second long intermediate shaft are sequentially fixed with an intermediate shaft constant mesh gear, an intermediate shaft third gear, an intermediate shaft second gear, and an intermediate shaft first gear.

7. A fully electric four-speed helical gearbox with a front auxiliary gearbox according to claim 6, characterized in that: The end of the main input shaft and the docking position of the output shaft are provided with a main input shaft head bearing and a third and fourth gear hub sleeve. When the third and fourth gear hub sleeve is docked with the main input shaft and the output shaft, the output shaft outputs power in fourth gear.

8. A fully electric four-speed helical gearbox with a front auxiliary gearbox according to claim 7, characterized in that: The output end of the main gearbox input shaft is fixedly fitted with a main gearbox input shaft gear, which meshes with two sets of intermediate shaft constant mesh gears.

9. A fully electric four-speed helical gearbox with a front auxiliary gearbox according to claim 8, characterized in that: The output shaft is sequentially fitted with an output shaft third gear, an output shaft second gear, a first and second gear hub sleeve, and an output shaft first gear. The output shaft third gear meshes with two sets of intermediate shaft third gears. The output shaft second gear meshes with the intermediate shaft second gear. The output shaft first gear meshes with the intermediate shaft first gear. When the third and fourth gear hub sleeves engage with the output shaft third gear, the output shaft outputs power in third gear. When the first and second gear hub sleeves engage with the output shaft first gear, the output shaft outputs power in first gear. When the first and second gear hub sleeves engage with the output shaft second gear, the output shaft outputs power in second gear.

10. A fully electric four-speed helical gearbox with a front auxiliary gearbox according to claim 1, characterized in that: Both the main housing and the auxiliary housing are made of aluminum.

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