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

Abstract

According to the active lubrication pure electric four-gear helical tooth gearbox with the front auxiliary box, a main box mechanism can be reasonably and conveniently arranged, the transmission stability is good, the noise is low, and the driving and riding comfort is good. 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

Technical Field

[0001] The present invention relates to the technical field of transmission structures, and specifically to an actively lubricated pure electric four-speed helical gearbox with a front auxiliary box. Background Art

[0002] The pure electric mode is the most reasonable energy mode for reliable emission reduction of heavy trucks at the present stage. However, due to the differences between heavy trucks and ordinary household cars, because heavy trucks have a large load and complex working conditions, they still need to be equipped with a gearbox to ensure energy consumption reduction and reliable and safe operation. However, for existing gearboxes, the power is directly connected to the input shaft of the main box. When there is a dual-motor power input, the power coupling needs to be completed in the main box. In actual operation, the power coupling mechanism occupies a large space in the main box, which in turn leads to a relatively compact layout of the drive shaft and the corresponding mechanisms. Moreover, the gear meshing in the main box of existing gearboxes is all straight gear meshing, which results in relatively poor transmission smoothness, high noise, and reduced ride comfort. Therefore, there is an urgent need to develop a gearbox that is convenient for the reasonable and convenient layout of the main box mechanism, has good transmission smoothness, low noise, and good ride comfort. Summary of the Invention

[0003] In view of the above problems, the present invention provides an actively lubricated pure electric four-speed helical gearbox with a front auxiliary box, which is convenient for the reasonable and convenient layout of the main box mechanism, has good transmission smoothness, low noise, and good ride comfort.

[0004] An actively lubricated pure electric four-speed helical gearbox with a front auxiliary box, characterized in that it comprises:

[0005] A front auxiliary box, which includes an auxiliary box housing, and an auxiliary box input shaft group and an input end of the main box input shaft are arranged inside the auxiliary box housing;

[0006] And a main box, which includes a main box housing, 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 inside the main box housing;

[0007] The front auxiliary box is arranged corresponding to the power input end side of 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 and connected to the auxiliary box driven gear on the main box input shaft through an auxiliary box input gear;

[0008] The main box input shaft and the output shaft in the main box housing are coaxially arranged;

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

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

[0011] Its further features are as follows:

[0012] A spline structure is provided on the second long intermediate shaft, and a power take-off is configured according to requirements for external power take-off;

[0013] The auxiliary box input shaft group includes two auxiliary box input shafts. The two auxiliary box input shafts are shaft bodies of the same structure and are sleeved with the same auxiliary box input gears;

[0014] The auxiliary box housing and the main box housing share an intermediate end plate, which makes the weight of the entire transmission relatively light;

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

[0016] The gear spacing and axial positions of the gears sleeved on the first short intermediate shaft and the second long intermediate shaft are the same. The intermediate shaft constant mesh gears, the intermediate shaft third gear, the intermediate shaft second gear, and the intermediate shaft first gear are sequentially fixed on the first short intermediate shaft and the second long intermediate shaft;

[0017] A main box input shaft head bearing and a third / fourth gear hub sliding sleeve are provided at the docking position between the end of the main box input shaft and the output shaft. When the third / fourth gear hub sliding sleeve docks the main box input shaft and the output shaft, the output shaft performs power output in the fourth gear;

[0018] A main box input shaft gear is fixedly sleeved on the output end of the main box input shaft, and the main box input shaft gear meshes with two groups of the intermediate shaft constant mesh gears;

[0019] The output shaft is successively sleeved with a third-gear output shaft gear, a second-gear output shaft gear, a first / second-gear hub sliding sleeve, and a first-gear output shaft gear. The third-gear output shaft gear meshes with two groups of the third-gear intermediate shaft gears. The second-gear output shaft gear is meshed and connected to the second-gear intermediate shaft gear. The first-gear output shaft gear is meshed and connected to the first-gear intermediate shaft gear. When the third / fourth-gear gear sliding sleeve is butted against the third-gear output shaft gear, the output shaft performs third-gear power output. When the first / second-gear hub sliding sleeve is butted against the first-gear output shaft gear, the output shaft performs first-gear power output. When the first / second-gear hub sliding sleeve is butted against the second-gear output shaft gear, the output shaft performs second-gear power output;

[0020] Both the main case housing and the auxiliary case housing are made of aluminum, with a light overall weight.

[0021] After adopting the present invention, each auxiliary case input shaft of the auxiliary case input shaft group of the auxiliary case is externally connected to a power source respectively. Then, the power is coupled through the corresponding auxiliary case input gear meshing with the auxiliary case driven gear on the main case input shaft, which increases the space inside the main case housing and makes the component arrangement inside the main case housing relatively simple and convenient. And because all the gears inside the main case housing and the auxiliary case housing are helical gears, it has good transmission smoothness, low noise, and good driving comfort. 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 case housing into the main case housing and the auxiliary case housing, enabling the lubricating oil to actively lubricate the devices inside the main case housing and the auxiliary case housing in all directions and improving the lubrication efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 is a front view of the intermediate end plate of a specific embodiment of the present invention;

[0024] Figure 3 is an assembled top view of the intermediate end plate and each shaft of a specific embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] An actively lubricated pure electric four-speed helical gear transmission with a front auxiliary case, see Figures 1 - 3 , which includes a front auxiliary case 100 and a main case 200;

[0026] The front auxiliary case 100 includes an auxiliary case housing 101, and the inside of the auxiliary case housing 101 is provided with an auxiliary case input shaft group and the input end of the main case input shaft 25

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

[0028] The front auxiliary box 100 is arranged corresponding to the power input end side of 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 externally connecting power input. Each auxiliary box input shaft 1 is meshed and connected to the auxiliary box driven gear 23 on the main box input shaft 25 through the auxiliary box input gear 3;

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

[0030] The first short intermediate shaft 6 and the second long intermediate shaft 14 are staggeredly arranged at the corresponding positions of the main box input shaft 25 and the output shaft 12. The input shaft 12 transmits the power shift to the output shaft through the shift component, 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 box housing 201 into the internal oil passages of the main box housing 201 and the auxiliary box housing 101 to fully and autonomously lubricate each shaft, bearing, and gear;

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

[0032] In a specific embodiment, a spline structure is arranged on the second long intermediate shaft 14, and a power take-off is configured according to requirements for external power take-off;

[0033] The auxiliary box input shaft group includes two auxiliary box input shafts 1. The two auxiliary box input shafts 1 are shaft bodies with the same structure and are sleeved with the same auxiliary box input gears 3;

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

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

[0036] The gear pitches and axial positions of the gears sleeved on the first short intermediate shaft 6 and the second long intermediate shaft 14 are the same. The intermediate shaft constant-mesh gears 5, the intermediate shaft third-speed gears 7, the intermediate shaft second-speed gears 8, and the intermediate shaft first-speed gears 9 are sequentially fixed on the first short intermediate shaft 6 and the second long intermediate shaft 14;

[0037] At the docking position of the end of the main case input shaft 25 and the output shaft 12, there are the main case input shaft head bearing 19 and the third and fourth gear hub sliding sleeves 18. When the third and fourth gear hub sliding sleeves 18 are docked with the main case input shaft 25 and the output shaft 12, the output shaft 12 performs the power output in the fourth gear;

[0038] A main case input shaft gear 20 is fixedly sleeved on the output end of the main case input shaft 25, and the main case input shaft gear 20 is meshed and connected with two groups of intermediate shaft constant mesh gears 5;

[0039] On the output shaft 12, there are successively sleeved with an output shaft third gear 17, an output shaft second gear 16, a first and second gear hub sliding sleeve 15, and an output shaft first gear 13. The output shaft third gear 17 is meshed with two groups of intermediate shaft third gears 7, the output shaft second gear 16 is meshed and connected with an intermediate shaft second gear 8, and the output shaft first gear 13 is meshed and connected with an intermediate shaft first gear 9. When the third and fourth gear sliding sleeves 18 are docked with the output shaft third gear 17, the output shaft 12 performs the power output in the third gear. When the first and second gear hub sliding sleeve 15 is docked with the output shaft first gear 13, the output shaft 12 performs the power output in the first gear. When the first and second gear hub sliding sleeve 15 is docked with the output shaft second gear 16, the output shaft 12 performs the power output in the second gear;

[0040] Both the main case housing 201 and the auxiliary case housing 101 are made of aluminum material, and the overall weight is light.

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

[0042] During specific implementation, the front end of the auxiliary case input shaft 1 is connected to an external power motor through a spline as the power input; the auxiliary case input shaft gear 3 is meshed with the auxiliary case driven gear 23, and the two power inputs are centrally conducted to the auxiliary case driven gear 23 through the auxiliary case input shaft gear 3. The auxiliary case driven gear 23 is connected to the main case input shaft 25 through an internal spline. The main case input shaft head bearing 19, the main case input shaft front bearing 24, and the main case input shaft rear bearing 21 ensure the coaxiality of the connection between the main case input sub-assembly and the main case shaft system and play a bearing role;

[0043] The secondary box driven gear 23 transmits power to the main box input shaft gear 20. The main box input shaft gear 20 integrated with the main box input shaft 25 is meshed and connected with the countershaft constant mesh gear 5. The countershaft constant mesh gear 5, countershaft third gear 7, countershaft second gear 8, and countershaft first gear 9 are successively fixed on the first short countershaft 6 and the second long countershaft 14, and are respectively connected with the main box input shaft gear 20, output shaft third gear 17, output shaft second gear 16, and output shaft first gear 13 for power connection and transmission. The front and rear of the first short countershaft 6 and the second long countershaft 14 are supported by bearings and are connected and limited to the housing. Among them, the rear end of the first short countershaft 6 is connected to the inner rotor of the oil pump. When the first short countershaft 6 rotates, it drives the oil pump 26 to work, delivering the lubricating oil inside the gearbox to the oil pipes and oil paths to ensure sufficient lubrication for the meshing between the bearings and gears in the secondary box and the main box of the gearbox.

[0044] The output shaft 12 is fixedly connected to the first and second gear hub sliding sleeves 15 and the third and fourth gear hub sliding sleeves 18 through splines. The output shaft first gear 13, output shaft second gear 16, and output shaft third gear 17 are respectively sleeved on the output shaft 12, and the gears are positioned by gear spacers. A long key is inserted between the output shaft 12 and the spacer to prevent the spacer from rotating. The front end of the output shaft 12 is connected to the above-mentioned input shaft head bearing 19, and the rear end is connected to the external housing through the output shaft bearing 11 to ensure the support and positioning of the output shaft 12.

[0045] The secondary box sub-assembly is designed with only one pair of gear meshing, mainly for speed reduction and torque increase, without operating gear shifting, and it only transmits external power to the main box input shaft.

[0046] Principle and gear position transmission of the specific embodiment

[0047] For the first gear, the first and second gear hub sliding sleeve 15 moves to the right and combines with the output shaft first gear 13. Power input - secondary box input shaft, secondary box input shaft gear - secondary box driven wheel - main box input shaft - main box input shaft gear - countershaft constant mesh gear - countershaft - countershaft first gear - output shaft first gear - first and second gear hub sliding sleeve - output shaft;

[0048] For the second gear, the first and second gear hub sliding sleeve 15 moves to the left and combines with the output shaft second gear 16. Power input - secondary box input shaft, secondary box input shaft gear - secondary box driven wheel - main box input shaft - main box input shaft gear - countershaft constant mesh gear - countershaft - countershaft second gear - output shaft second gear - first and second gear hub sliding sleeve - output shaft;

[0049] For the third gear, the third and fourth gear hub sliding sleeve 18 moves to the right and combines with the output shaft third gear 17. Power input - secondary box input shaft, secondary box input shaft gear - secondary box driven wheel - main box input shaft - main box input shaft gear - countershaft constant mesh gear - countershaft - countershaft third gear - output shaft third gear - third and fourth gear hub sliding sleeve - output shaft;

[0050] For the fourth gear and the third and fourth gear hub sliding sleeve 18 moves leftward and engages with the input shaft 25. The fourth gear is a direct gear, and the power input is directly transmitted to the output shaft through the input shaft;

[0051] It is designed with long and short intermediate shafts. The short intermediate shaft is connected to the oil pump to drive the oil pump to operate. Splines are designed on the long intermediate shaft, which can be equipped with a power take-off for external power take-off.

[0052] Its beneficial effects are as follows:

[0053] Adopting the helical gear scheme, the operation is smoother, the noise is reduced, which is beneficial to improving the comfort. And considering the axial force factor of the helical gear, the gears on the input shaft and the second shaft are left-handed, and the gears on the intermediate shaft are right-handed;

[0054] A sub-box structure is added at the input end of the gearbox. The sub-box is designed with two input shafts. The shaft systems are all arranged with helical gear shaft systems and are staggered with the intermediate shaft system of the main box, shortening the axial distance;

[0055] An oil pump is designed for active lubrication. Corresponding oil circuits are provided between the housing and the shaft systems to fully lubricate all contact surfaces and rotating parts. The oil passage of the main box is extended to the sub-box. After lubricating the shaft system of the main box, it enters the sub-box for lubrication to form a cycle;

[0056] Shift parts such as gear hubs and shift engagement teeth are cancelled, and it is simplified into a design of a hub sliding sleeve, reducing the number of components, improving reliability, and facilitating subsequent maintenance;

[0057] The housing is made of aluminum alloy to reduce the weight, and the processing technology is configured to facilitate cost control.

[0058] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0059] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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. An active lubrication pure electric four-speed helical gearbox with a front auxiliary gearbox, characterized in that, It includes: A front auxiliary box, which includes an auxiliary box housing, and an auxiliary box input shaft group and an input end of the main box input shaft are arranged inside the auxiliary box housing; And a main box, which includes a main box housing, 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 inside the main box housing; The front auxiliary box is arranged corresponding to the power input end side of the main box. The auxiliary box input shaft group includes at least two auxiliary box input shafts. Each auxiliary box input shaft protrudes outside the auxiliary box housing and is used for externally connecting power input. Each auxiliary box input shaft is meshed and connected to an auxiliary box driven gear on the main box input shaft through an auxiliary box input gear; The main box input shaft and the output shaft in the main box housing are coaxially arranged; The first short intermediate shaft and the second long intermediate shaft are staggered at corresponding positions of the main box input shaft and the output shaft. The input shaft transmits power and shifts gears to the output shaft through a shifting component, 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 box housing into the main box housing and the auxiliary box housing; All gears in the main box housing and the auxiliary box housing are helical gears.

2. The active lubrication pure electric four-speed helical gearbox with a front auxiliary case according to claim 1, wherein: A spline structure is arranged on the second long intermediate shaft, and a power take-off is configured according to requirements for external power take-off.

3. The active lubrication pure electric four-speed helical gearbox with a front auxiliary case according to claim 1, characterized in that: The auxiliary box input shaft group includes two auxiliary box input shafts. The two auxiliary box input shafts are shaft bodies with the same structure and are sleeved with the same auxiliary box input gears.

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

5. The active lubrication pure electric four-speed helical gearbox with a front auxiliary case according to claim 4, characterized in that: The main box input shaft is arranged at the central position of the intermediate end plate. Auxiliary box input shafts are respectively arranged at two corresponding positions of a diagonal line corresponding to the main box input shaft on the intermediate end plate. The first short intermediate shaft and the second long intermediate shaft are respectively arranged at two corresponding positions of the other diagonal line corresponding to the main box input shaft on the intermediate end plate, and the first short intermediate shaft is located at a relatively high side position.

6. The active lubrication pure electric four-speed helical gearbox with a front auxiliary box according to claim 1, characterized in that: The gear pitches and axial positions of the gears sleeved on the first short intermediate shaft and the second long intermediate shaft are the same. Intermediate shaft constant-mesh gears, intermediate shaft third-speed gears, intermediate shaft second-speed gears, and intermediate shaft first-speed gears are sequentially fixed on the first short intermediate shaft and the second long intermediate shaft.

7. An active lubrication pure electric four-speed helical gearbox with a front auxiliary box according to claim 6, characterized in that: A main box input shaft head bearing and a third / fourth-speed gear hub sliding sleeve are arranged at the butt joint position of the end of the main box input shaft and the output shaft. When the third / fourth-speed gear hub sliding sleeve butts the main box input shaft and the output shaft, the output shaft outputs power in the fourth gear.

8. The active lubrication pure electric four-speed helical gearbox with a front auxiliary box according to claim 7, characterized in that: A main box input shaft gear is fixedly sleeved on the output end of the main box input shaft, and the main box input shaft gear is meshed and connected to two groups of the intermediate shaft constant-mesh gears.

9. The active lubrication pure electric four-speed helical gearbox with a front auxiliary box according to claim 8, characterized in that: The output shaft is successively sleeved with a third-gear output shaft gear, a second-gear output shaft gear, a first / second-gear hub sliding sleeve, and a first-gear output shaft gear. The third-gear output shaft gear meshes with two sets of the third-gear intermediate shaft gears. The second-gear output shaft gear is meshed and connected to the second-gear intermediate shaft gear. The first-gear output shaft gear is meshed and connected to the first-gear intermediate shaft gear. When the third / fourth-gear sliding sleeve is butted against the third-gear output shaft gear, the output shaft performs third-gear power output. When the first / second-gear hub sliding sleeve is butted against the first-gear output shaft gear, the output shaft performs first-gear power output. When the first / second-gear hub sliding sleeve is butted against the second-gear output shaft gear, the output shaft performs second-gear power output.

10. The active lubrication pure electric four-speed helical gearbox with a front auxiliary box according to claim 1, characterized in that: Both the main case housing and the auxiliary case housing are made of aluminum.

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