CN221067777U - Electric drive single-stage reduction shafting structure, electric drive assembly and vehicle - Google Patents
Electric drive single-stage reduction shafting structure, electric drive assembly and vehicle Download PDFInfo
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- CN221067777U CN221067777U CN202322900220.7U CN202322900220U CN221067777U CN 221067777 U CN221067777 U CN 221067777U CN 202322900220 U CN202322900220 U CN 202322900220U CN 221067777 U CN221067777 U CN 221067777U
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- 230000009467 reduction Effects 0.000 title claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 238000013461 design Methods 0.000 abstract description 9
- 238000003756 stirring Methods 0.000 abstract description 8
- 238000009434 installation Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of electric drive, and particularly relates to an electric drive single-stage reduction shafting structure, an electric drive assembly and a vehicle. The axial size of the electric drive assembly in the area can be reduced, and the volume of the electric drive assembly can be reduced. The intermediate shaft assembly is omitted, the number of bearings is reduced, the failure risk of the shafting is reduced, and the reliability is higher. Under the condition of meeting the power requirement of small and medium-sized vehicles, the gear engagement loss, the bearing loss and the oil stirring loss are reduced, the dragging torque is reduced, and the transmission efficiency is effectively improved. The volume and the weight of the electric drive assembly can be made smaller, the lightweight design of the vehicle is facilitated, and the electric drive assembly can adapt to the installation in a limited space and meet the requirement of minimum ground clearance when being carried on small and medium-sized vehicles.
Description
Technical Field
The utility model belongs to the technical field of electric drive, and particularly relates to an electric drive single-stage reduction shaft system structure, an electric drive assembly and a vehicle.
Background
With the development of new energy automobiles, the electric drive assembly is used as a power source of the new energy automobiles, and the requirements of the electric drive assembly are higher and higher. The existing electric drive assembly is generally of a two-stage reduction shaft system structure, and comprises a motor rotor shaft, an input shaft, a middle shaft assembly, a differential mechanism and other structures, the high-speed high-power requirement can be well met, the power required by power is smaller for some small and medium-sized vehicles, the two-stage reduction shaft system structure can meet the power requirement, but the whole structure is relatively complex, the number of parts such as gear shaft parts and bearings is large, and the gear engagement loss, the bearing loss and the stirring oil loss are large in the transmission process, and the dragging torque is large. The electric drive assembly has high structural complexity, a large number of parts, high cost and weight, large overall volume, limited space on small and medium-sized vehicles, and difficulty in meeting the requirements of installation and minimum ground clearance in the limited space.
Disclosure of utility model
The utility model aims to solve the technical problems of providing an electric drive single-stage reduction shaft system structure and an electric drive assembly which reduce the structural complexity and the volume, are beneficial to light-weight design and reduce transmission loss, and is particularly suitable for small and medium-sized vehicles, and provides a vehicle with the electric drive assembly.
The utility model relates to an electric drive single-stage reduction shafting structure which comprises a motor rotor shaft and a differential mechanism, wherein one end of the motor rotor shaft is prolonged, a driving gear is integrally arranged at one end of the motor rotor shaft, which is prolonged, the differential mechanism is provided with a main reduction gear, and the main reduction gear is meshed with the driving gear.
Further, the number of teeth of the driving gear is greater than or equal to 13 and less than or equal to 17.
Still further, the tooth profile pressure angle of the drive gear is less than 19 °.
Further, the main reducing gear is sleeved on the shell of the differential mechanism and fixed through bolts.
Further, the main reducing gear is sleeved on the shell of the differential mechanism and fixed through welding.
The utility model also relates to an electric drive assembly which is characterized by being provided with the electric drive single-stage reduction shaft system structure.
Still further, this electric drive assembly includes the assembly casing, and electric drive single-stage reduction shafting structure sets up in the assembly casing, install three bearing one in the assembly casing, wherein two bearing one correspond and be connected with the both ends of motor rotor shaft, and another bearing one is connected between the both ends of motor rotor shaft and is located between driving gear and the region where rotor is located to carry out the three-point support to motor rotor shaft, still install two bearing two in the assembly casing, two bearing two correspond and connect the both ends at the differential mechanism.
Still further, the assembly casing includes motor housing and reduction gear casing, and one side of motor housing and one side of reduction gear casing can be dismantled and be connected, and one bearing that is connected with motor rotor axle is equipped with driving gear one end is installed in one side that the reduction gear casing deviates from the motor housing, and one bearing that is connected with the other end of electron rotor axle is installed in one side that the motor housing deviates from the reduction gear casing, and one bearing that is connected between the both ends of motor rotor axle is installed in one side that the reduction gear casing is connected to the motor housing.
Further, one of the second bearings is installed in the motor casing, and the other second bearing is installed in the speed reducer casing.
The present disclosure also relates to a vehicle provided with an electric drive assembly as described above.
The utility model has the advantages that one end of the motor rotor shaft is prolonged to form an input shaft part which is integrally arranged with the motor rotor shaft, and the driving gear is arranged on the part, so that a connecting structure between the motor rotor shaft and the input shaft can be omitted, the structural complexity is reduced, the axial space of the area is reduced, the axial size of the electric drive assembly in the area is reduced, and the volume of the electric drive assembly is reduced. Through directly with main gear and the driving gear meshing of subtracting, form single-stage reduction structure, under the circumstances that satisfies the transmission of reducing speed and increasing torque, saved the setting of jackshaft subassembly, when using in the electric drive assembly, need not to set up corresponding bearing and bearing frame hole, reduced the quantity of part and corresponding processing procedure, the cost is reduced. Because the intermediate shaft assembly can have welding failure risk when adopting welded connection, and can have spline fracture failure or loosening abnormal sound problem when adopting spline connection, and the running parts such as bearings can also have pitting corrosion, abrasion, fracture and other failure risks, the utility model omits the intermediate shaft assembly and reduces the number of bearings required by a shafting, reduces the failure risk of the shafting, has higher reliability, reduces gear engagement loss, bearing loss and oil stirring loss thereof, reduces dragging torque and effectively improves transmission efficiency under the condition of meeting the power requirements of small and medium-sized vehicles. Meanwhile, the whole volume and weight of the shafting structure are smaller, so that the volume and weight of the electric drive assembly can be smaller, and the shafting structure can be favorable for the light design of the vehicle on one hand and can adapt to the installation in a limited space and meet the requirement of minimum ground clearance on the other hand when being carried on small and medium-sized vehicles for use.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
In the figure: 1. a motor rotor shaft; 2. a drive gear; 3. a differential; 4. a main subtracting gear; 5. a first bearing; 6. a second bearing; 7. a motor housing; 8. a speed reducer housing.
Detailed Description
As shown in fig. 1, the utility model provides an electrically driven single-stage reduction shafting structure, which comprises a motor rotor shaft 1 and a differential mechanism 3, wherein one end of the motor rotor shaft 1 is prolonged and arranged, one end of the motor rotor shaft 1 prolonged and arranged is integrally provided with a driving gear 2, namely an input shaft and the motor rotor shaft 1 are integrally arranged, the prolonged part of the motor rotor shaft 1 is an integrally arranged input shaft part, the differential mechanism 3 is provided with a main reduction gear 4, and the main reduction gear 4 is meshed with the driving gear 2 to form the single-stage reduction structure.
According to the economic requirement of vehicle dynamic property, the maximum input torque of the motor is T (unit Nm), the maximum input rotating speed is N (unit rpm), the total speed ratio of the speed reduction structure is required to be set to 9.4, if the primary speed ratio is i 1 and the secondary speed ratio is i 2 through two-stage speed reduction transmission, i 1×i2 =9.4 needs to be met, the total output torque of the differential mechanism in two-stage speed reduction is T×i 1×i2 =T×9.4 under the premise of not considering the efficiency, and the total output rotating speed is N/(i 1×i2) =N/9.4; the single-stage speed reduction structure is adopted, the main reduction gear is a driven gear, and the total speed ratio is a single-stage speed ratio, namely i=the number of teeth of the main reduction gear/the number of teeth of the driving gear=9.4, so that the total output torque of the differential mechanism in single-stage speed reduction is T multiplied by 9.4 and the total output rotating speed is N/9.4 based on the same motor input. According to the comparison, under the condition that the total speed ratio is consistent, the single-stage speed reduction structure can meet the requirements of speed reduction and torque increase transmission.
In the utility model, one end of the motor rotor shaft 1 is prolonged to form an input shaft part which is integrally arranged with the motor rotor shaft 1, and the driving gear 2 is arranged on the input shaft part, so that a connecting structure between the motor rotor shaft 1 and the input shaft can be omitted, the structural complexity is reduced, the axial space of the region is reduced, the axial size of the electric drive assembly in the region is reduced, and the volume of the electric drive assembly is reduced. Through directly with main gear 4 and the meshing of driving gear 2 that subtracts, form single-stage reduction structure, under the circumstances that satisfies the transmission of speed reduction and torque multiplication, saved the setting of jackshaft subassembly, when using in the electric drive assembly, need not to set up corresponding bearing and bearing frame hole, reduced the quantity of part and corresponding processing procedure, reduced the cost. Because the intermediate shaft assembly can have welding failure risk when adopting welded connection, and can have spline fracture failure or loosening abnormal sound problem when adopting spline connection, and the running parts such as bearings can also have pitting corrosion, abrasion, fracture and other failure risks, the utility model omits the arrangement of the intermediate shaft assembly and reduces the number of bearings required by a shafting, reduces the failure risk of the shafting, has higher reliability, reduces gear engagement loss, bearing loss and oil stirring loss thereof, reduces dragging torque and effectively improves transmission efficiency under the condition of meeting the power requirements of small and medium-sized vehicles. Meanwhile, the whole volume and weight of the shafting structure are smaller, so that the volume and weight of the electric drive assembly can be smaller, and the shafting structure can be favorable for the light design of the vehicle on one hand and can adapt to the installation in a limited space and meet the requirement of minimum ground clearance on the other hand when being carried on small and medium-sized vehicles for use.
For small and medium-sized vehicles, because the whole vehicle space is limited and the minimum ground clearance requirement needs to be met, the center distance between the main reduction gear 2 and the main reduction gear 4 is smaller, preferably the number of teeth of the driving gear 2 is smaller than or equal to 17 and larger than or equal to 13, and the total speed ratio is more than 7. The tooth number is relatively small, the gear has a larger modulus under the condition of smaller center distance, namely, the design of small tooth number and large modulus is adopted, the bearing capacity of the driving gear 2 is improved, undercut is avoided as much as possible on the basis of the design of small tooth number and large modulus, the strength of the driving gear 2 and the contact ratio during engagement are ensured, and the NVH performance is improved. It is further preferable that the tooth profile pressure angle of the driving gear 2 is smaller than 19 degrees, namely, the design of higher tooth top and smaller tooth top thickness is adopted, so that the tooth profile pressure angle is closer to the fine high tooth, the contact ratio during meshing is improved, the rotating side gap of a shafting is reduced, and the NVH performance is improved.
In one arrangement of the present utility model, the main reducing gear 4 is sleeved on the casing of the differential 3 and is fixed by bolts, and the arrangement is convenient to assemble and disassemble and convenient to subsequent maintenance.
In another arrangement mode of the utility model, the main reduction gear 4 is sleeved on the shell of the differential mechanism 3 and fixed by welding, and compared with a bolt connection mode, the arrangement mode has the advantages that the end face of the connecting part is approximately planar, the bulge of the end part of the bolt does not exist, the connecting part can be prevented from participating in stirring oil, the stirring oil loss is lower, and the transmission efficiency is improved.
The utility model also provides an electric drive assembly, which is provided with the electric drive single-stage reduction shaft system structure. The axial size of the electric drive assembly in the area can be reduced, and the volume of the electric drive assembly is reduced. The number of the gear shaft parts and the bearings is smaller, the welding failure risk is reduced, and the reliability is improved. Under the condition of meeting the power requirement of small and medium-sized vehicles, the gear engagement loss, the bearing loss and the oil stirring loss are reduced, so that the dragging torque is reduced, and the transmission efficiency is effectively improved. The volume and the weight of the electric drive assembly can be made smaller, the lightweight design of the vehicle can be facilitated, and the electric drive assembly can adapt to the installation in a limited space and meet the requirement of minimum ground clearance when being carried on small and medium-sized vehicles for use.
The electric drive assembly comprises an assembly shell, wherein an electric drive single-stage reduction shaft system structure is arranged in the assembly shell, three first bearings 5 are arranged in the assembly shell, as shown in figure 1, two first bearings 5 are correspondingly connected with two ends of a motor rotor shaft 1, and the other first bearings 5 are connected between two ends of the motor rotor shaft 1 and are positioned between a driving gear 2 and an area where a rotor is positioned so as to support the motor rotor shaft 1 at three points, and good supporting rigidity of the motor rotor shaft 1 in torque transmission is guaranteed.
Two second bearings 6 are also installed in the assembly shell, and the two second bearings 6 are correspondingly connected to two ends of the differential mechanism 3 and used for supporting the differential mechanism 3.
The assembly shell comprises a motor shell 7 and a speed reducer shell 8, wherein the motor shell 7 is a shell part on one side of a motor in the assembly shell, the speed reducer shell 8 is a shell part on one side of a speed reducer in the assembly shell, one side of the motor shell 7 is detachably connected with one side of the speed reducer shell 8, and the assembly shell is formed so as to facilitate assembly of bearings and other parts in the assembly shell. As shown in fig. 1, among three first bearings 5, the first bearing 5 connected with one end of the motor rotor shaft 1 provided with the driving gear 2 is installed in one side of the speed reducer housing 8 away from the motor housing 7, a rear end cover is detachably arranged on one side of the motor housing 7 away from the speed reducer housing 8, and the first bearing 5 connected with the other end of the electronic rotor shaft is located on one side of the motor housing 7 away from the speed reducer housing 8 and installed in the rear end cover; the first bearing 5 connected with the two ends of the motor rotor shaft 1 is arranged in one side of the motor shell 7 connected with the reducer shell 8. One of the two bearings 6 is arranged in the motor casing, and the other bearing 6 is arranged in the reducer casing 8. The above arrangement can facilitate the installation of the first bearing 5 and the second bearing 6 while ensuring the supporting strength.
The utility model also provides a vehicle provided with an electric drive assembly as described above. When the vehicle is a medium-sized and small-sized vehicle, the gear meshing loss, the bearing loss and the oil stirring loss are reduced under the condition of meeting the power demand, the towing torque is reduced, the transmission efficiency is effectively improved, and the lightweight design of the vehicle is facilitated.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of protection of the application is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order and there are many other variations of the different aspects of one or more embodiments of the application as described above, which are not provided in detail for the sake of brevity.
One or more embodiments of the present application are intended to embrace all such alternatives, modifications and variations as fall within the broad scope of the present application. Accordingly, any omissions, modifications, equivalents, improvements and others which are within the spirit and principles of the one or more embodiments of the application are intended to be included within the scope of the application.
Claims (10)
1. The utility model provides an electric drive single-stage reduction shafting structure, its characterized in that, includes motor rotor shaft (1) and differential mechanism (3), motor rotor shaft (1) one end extension sets up, and motor rotor shaft (1) extension one end that sets up is integrative to be equipped with driving gear (2), be provided with on differential mechanism (3) and subtract gear (4), main gear (4) and driving gear (2) meshing that subtracts.
2. The electrically driven single stage reduction shaft structure according to claim 1, wherein the number of teeth of the driving gear (2) is greater than or equal to 13 and less than or equal to 17.
3. An electrically driven single stage reduction shaft structure according to claim 2, characterized in that the tooth profile pressure angle of the driving gear (2) is less than 19 °.
4. An electrically driven single stage reduction shaft structure according to any one of claims 1 to 3, wherein the main reduction gear (4) is sleeved on the housing of the differential (3) and is fixed by bolts.
5. An electrically driven single stage reduction shaft structure according to any one of claims 1 to 3, wherein the main reduction gear (4) is sleeved on the housing of the differential (3) and fixed by welding.
6. An electrically driven assembly provided with an electrically driven single stage reduction shaft structure as claimed in any one of claims 1 to 5.
7. An electric drive assembly as claimed in claim 6, characterized in that the electric drive assembly comprises an assembly housing, the electric drive single-stage reduction shaft structure is arranged in the assembly housing, three first bearings (5) are arranged in the assembly housing, two first bearings (5) are correspondingly connected with two ends of the motor rotor shaft (1), the other first bearings (5) are connected between two ends of the motor rotor shaft (1) and are positioned between the driving gear (2) and the rotor area so as to carry out three-point support on the motor rotor shaft (1), two second bearings (6) are also arranged in the assembly housing, and the two second bearings (6) are correspondingly connected with two ends of the differential mechanism (3).
8. An electric drive assembly as claimed in claim 7, characterized in that the assembly housing comprises a motor housing (7) and a gear housing (8), one side of the motor housing (7) being detachably connected to one side of the gear housing (8), a first bearing (5) connected to one end of the motor rotor shaft (1) provided with the driving gear (2) being mounted in the side of the gear housing (8) facing away from the motor housing (7), a first bearing (5) connected to the other end of the electronic rotor shaft being mounted in the side of the motor housing (7) facing away from the gear housing (8), a first bearing (5) connected between the two ends of the motor rotor shaft (1) being mounted in the side of the motor housing (7) facing the gear housing (8).
9. An electric drive assembly as claimed in claim 8, characterized in that one of the two bearings (6) is mounted in the motor housing and the other bearing (6) is mounted in the reducer housing (8).
10. A vehicle provided with an electric drive assembly as claimed in any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322900220.7U CN221067777U (en) | 2023-10-27 | 2023-10-27 | Electric drive single-stage reduction shafting structure, electric drive assembly and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322900220.7U CN221067777U (en) | 2023-10-27 | 2023-10-27 | Electric drive single-stage reduction shafting structure, electric drive assembly and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221067777U true CN221067777U (en) | 2024-06-04 |
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ID=91259590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322900220.7U Active CN221067777U (en) | 2023-10-27 | 2023-10-27 | Electric drive single-stage reduction shafting structure, electric drive assembly and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221067777U (en) |
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2023
- 2023-10-27 CN CN202322900220.7U patent/CN221067777U/en active Active
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