CN221278413U - Coaxial electric drive bridge sealing structure - Google Patents
Coaxial electric drive bridge sealing structure Download PDFInfo
- Publication number
- CN221278413U CN221278413U CN202323483592.0U CN202323483592U CN221278413U CN 221278413 U CN221278413 U CN 221278413U CN 202323483592 U CN202323483592 U CN 202323483592U CN 221278413 U CN221278413 U CN 221278413U
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- oil seal
- oil
- motor
- seal
- bridge
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- 238000007789 sealing Methods 0.000 title claims abstract description 29
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 119
- 239000010687 lubricating oil Substances 0.000 abstract description 10
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Abstract
The utility model discloses a coaxial electric drive bridge sealing structure, which is characterized in that a first oil seal (7) is arranged between a motor shaft (3) of a motor assembly and a motor shell (5); a second oil seal (8) is arranged between the motor shaft (3) and the first half shaft (1); a third oil seal (9) is arranged between the speed reducer shell (6) and the second half shaft (2). By adopting the technical scheme, the sealing structure is arranged in the reducer shell, the transmission system is more compact in structure, lubricating oil is prevented from entering the bridge pipe, and the oil filling amount is reduced; the oil is prevented from accumulating in the bridge pipe, the lubricating oil quantity in the cavity of the speed reducer is reduced, and foreign matters in the bridge pipe are prevented from entering the cavity of the speed reducer box; the mounting position of the oil seal is arranged between the motor shaft and the half shaft, so that abrasion of radial runout of the half shaft to the inner lip of the oil seal is reduced, the service life of the oil seal is prolonged, the risk of oil leakage is reduced, and the sealing effect is improved.
Description
Technical Field
The utility model belongs to the technical field of new energy automobile power systems. More particularly, the utility model relates to a coaxial electrically driven bridge seal structure.
Background
In recent years, in order to meet the development demands of national energy strategies, energy conservation and emission reduction are realized, and electric drive technology is rapidly developed. In the field of small commercial logistics vehicles, a rear drive bridge type transmission system is adopted in the current mainstream vehicle type, so that the purpose is to improve the carrying capacity of the logistics vehicle, reduce the volume of a driving system and make room for the installation of a container.
The existing electric drive axle generally adopts a scheme that two ends are sealed, and oil seals are respectively arranged at two ends of an output shaft of the electric drive axle. Under the condition, because the output shafts at the left end and the right end of the electric drive bridge are longer, the radial runout of the output shafts is larger, so that the oil seals at the left end and the right end can be subjected to eccentric wear, the service life of the oil seals is influenced, and a certain oil leakage risk exists.
The key words are adopted: "electrically driven; the keywords such as seal search the related technical literature disclosed in the prior art, and the following results are obtained:
The Chinese patent document with the authorized bulletin number of CN213981934U discloses a driving axle sealing structure for an automatic speed changing electric driving axle, and the recorded technical scheme is as follows:
The sealing structure comprises a differential shell, a transmission shaft and a wheel mounting plate, wherein the middle position of the upper end of the differential shell is rotationally connected with a driving shaft, the left end and the right end of the differential shell are rotationally connected with the transmission shaft, the other end of the transmission shaft is fixedly connected with the wheel mounting plate, the middle position of the upper end of the differential shell is fixedly connected with a rotating seat, the inside of the upper end of the rotating seat is provided with a lower sealing ring, the upper side of the lower sealing ring is rotationally connected with an upper sealing ring, the upper end of the rotating seat is fixedly connected with an upper cover plate, and the left end and the right end of the upper cover plate are spirally connected with second fastening bolts;
However, the technical solution disclosed in the patent document cannot solve the technical problems and drawbacks of the above-mentioned "because the output shafts at the left and right ends of the electrically driven bridge are long, the radial runout of the output shafts is large, the oil seals at the left and right ends are eccentric-worn, the service life of the oil seals is affected, and there is a certain risk of oil leakage" described in the prior art.
Disclosure of utility model
The utility model provides a coaxial electric drive bridge sealing structure, which aims to improve the sealing effect of an electric drive output shaft.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
The coaxial electric drive bridge sealing structure comprises a first half shaft, a second half shaft, a motor assembly, a differential mechanism assembly and a speed reducing mechanism, wherein the speed reducing mechanism is arranged between the motor assembly and the differential mechanism assembly and is used for transmitting power generated by the motor assembly to the differential mechanism assembly; the motor assembly is arranged in the inner cavity of the motor shell; the speed reducing mechanism and the differential mechanism assembly are arranged in the inner cavity of the speed reducer shell; a first oil seal is arranged between a motor shaft of the motor assembly and a motor shell; a second oil seal is arranged between the motor shaft and the first half shaft; and a third oil seal is arranged between the speed reducer shell and the second half shaft.
The second oil seal comprises an oil seal inner ring which is contacted with the first half shaft and an oil seal outer ring which is in interference fit with an inner hole of the motor shaft.
The interference between the main lip of the second oil seal and the motor shaft is between 0.6 and 1.0 mm.
And the main lip of the second oil seal is made of PTFE (polytetrafluoroethylene) material.
The oil return line of the second oil seal is a spiral line; the oil return line is arranged on the inner circular surface of the inner ring of the oil seal and is contacted with the outer circular surface of the first half shaft.
The first oil seal adopts a spring-free oil seal structure.
The first oil seal is made of FKM (fluororubber).
The oil seal inner ring of the first oil seal is in interference fit with the motor shaft; the oil seal outer ring of the first oil seal is in interference fit with the motor shell.
The coaxial electric drive bridge comprises a first bridge pipe and a second bridge pipe; the first bridge pipe and the second bridge pipe are cast.
By adopting the technical scheme, the sealing structure is arranged in the reducer shell, the transmission system is more compact in structure, occupies small space in the reducer, prevents lubricating oil from entering the bridge pipe, and reduces the oil filling amount; the oil is prevented from accumulating in the bridge pipe, the lubricating oil quantity in the cavity of the speed reducer is reduced, and foreign matters in the bridge pipe are prevented from entering the cavity of the speed reducer box; the mounting position of the oil seal moves to the middle of the motor shaft and the half shaft from the two end faces of the half shaft, so that abrasion of radial runout of the half shaft to the inner lip of the oil seal is reduced, the service life of the oil seal is prolonged, the risk of oil leakage is reduced, and the sealing effect is improved.
Drawings
The contents of the drawings and the marks in the drawings are briefly described as follows:
FIG. 1 is a cross-sectional view of a coaxial electrically driven bridge seal of the present utility model;
Fig. 2 is a cross-sectional view of the second oil seal shown in fig. 1.
Marked in the figure as:
1. The three-dimensional gear comprises a first half shaft, 2, a second half shaft, 3, a motor shaft, 4, a differential mechanism assembly, 5, a motor shell, 6, a speed reducer shell, 7, a first oil seal, 8, a second oil seal, 9, a third oil seal, 10, an oil seal inner ring, 11 and an oil seal outer ring.
Detailed Description
The following detailed description of the embodiments of the utility model, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate, and thorough understanding of the inventive concepts and aspects of the utility model by those skilled in the art.
The structure of the utility model as shown in fig. 1 and 2 is a coaxial electric drive bridge sealing structure, the coaxial electric drive bridge comprises a first bridge pipe, a second bridge pipe, a first half shaft 1, a second half shaft 2, a motor assembly, a differential mechanism assembly 4 and a speed reducing mechanism, wherein the speed reducing mechanism is arranged between the motor assembly and the differential mechanism assembly 4 and is used for transmitting power generated by the motor assembly to the differential mechanism assembly 4; the speed reducing mechanism plays a role in speed reduction.
The motor assembly is arranged in the inner cavity of the motor shell 5; the speed reducing mechanism and the differential mechanism assembly 4 are arranged in the inner cavity of the speed reducer shell 6, namely the speed reducing mechanism and the differential mechanism assembly 4 are positioned in the speed reducer shell 6. The coaxial electric drive bridge sealing structure is arranged in the reducer shell 6, so that the compactness of a transmission system is improved, lubricating oil is prevented from entering a bridge pipe, and the oil filling amount is reduced.
The first half shaft 1, the second half shaft 2, the first bridge pipe and the second bridge pipe are coaxially arranged; the first axle tube is sleeved on the first half axle 1, and the second axle tube is sleeved on the second half axle 2; the first half shaft 1 and the second half shaft 2 are respectively connected with two half shaft gears in the differential mechanism assembly 4; the center of the motor shaft 3 is provided with a center hole for the first half shaft 1 to pass through.
The motor assembly comprises a motor shell 5, a motor stator fixedly arranged in the motor shell 5, a motor rotor matched with the motor stator and a motor shaft 3 coaxially and fixedly connected with the motor rotor; the motor housing 5 is fixedly connected with the speed reducer housing 6.
In order to solve the problems existing in the prior art and overcome the defects thereof and realize the aim of improving the sealing effect, the utility model adopts the following technical scheme:
As shown in fig. 1 and 2, in the coaxial electric drive bridge sealing structure of the utility model, a first oil seal 7 is arranged between a motor shaft 3 and a motor housing 5 of the motor assembly; a second oil seal 8 is arranged between the motor shaft 3 and the first half shaft 1; a third oil seal 9 is arranged between the speed reducer housing 6 and the second half shaft 2.
The differential assembly 4 is located between the second oil seal 8 and the third oil seal 9.
Specifically, this coaxial electricity drives bridge seal structure includes: a first oil seal 7 for sealing between the motor shaft 3 and the motor housing 5; a second oil seal 8 for sealing between the motor shaft 3 and the first half shaft 1; a third oil seal 9 is also included for sealing between the reducer housing 6 and the second axle shaft 2.
The first half shaft 1 passes through the motor shaft 3; the second oil seal 8 comprises an oil seal inner ring 10 in contact with the first half shaft 1 and an oil seal outer ring 11 in interference fit with the inner hole of the motor shaft 3. The oil seal inner ring 10 and the oil seal outer ring 11 can rotate relatively. The oil seal inner ring 10 and the oil seal outer ring 11 are in contact with the rotating piece, so that the service life of the oil seal can be prolonged, the risk of oil leakage is reduced, and the sealing effect is improved.
The diameter of the inner ring of the first oil seal 7 is 72mm, the inner ring of the oil seal of the first oil seal 7 is in interference fit with the motor shaft 3, and the diameter of the outer ring of the oil seal of the first oil seal 7 is 92mm; the oil seal outer ring of the first oil seal 7 is in interference fit with the motor housing 5, and is used for preventing lubricating oil in the speed reducer cavity from flowing into the motor cavity when the electric drive bridge operates, so that a sealing effect is achieved.
The second oil seal 8 has the function of preventing lubricating oil in the cavity of the speed reducer from flowing into a gap between the motor shaft 3 and the first half shaft 1, so that the lubricating oil is accumulated at the rear end of the motor and in the bridge pipe, and the oil in the cavity of the speed reducer box is reduced.
When the electric drive bridge operates, the input rotation speed of the motor shaft 3 is 12000rpm at most, the speed ratio of the speed reduction mechanism is about 11.1, after the power generated by the motor is subjected to two-stage speed reduction of two pairs of gears of the speed reduction mechanism, the maximum output rotation speed of the first half shaft 1 is 1080rpm, the rotation direction of the first half shaft 1 is the same as the rotation direction of the motor shaft 3, and a rotation speed difference exists.
The oil seal inner ring 10 and the oil seal outer ring 11 of the second oil seal 8 are connected with the rotating piece, and rotate bidirectionally, so that the conventional oil seal cannot meet the requirements of centrifugal force and large eccentricity caused by rotation speed difference, and the problem is solved by adopting the structure of the utility model.
The interference between the main lip of the second oil seal 8 and the motor shaft 3 is between 0.6 and 1.0mm, so that the problem of overlarge eccentric amount can be effectively compensated, and the failure problem of lip abrasion can be reduced.
The main lip of the second oil seal 8 is made of PTFE material, namely polytetrafluoroethylene.
The oil return line of the second oil seal 8 is a spiral line; the oil return line is arranged on the inner circular surface of the oil seal inner ring 10 and is contacted with the outer circular surface of the first half shaft 1.
The first oil seal 7 adopts a spring-free oil seal structure; the spiral oil return line can well play a role in pumping oil return, meanwhile, the spring is canceled, the lip sealing width is increased, the first oil seal 7 is made of FKM (FKM), namely fluororubber, and can meet the environmental requirements of high speed, low friction, less oil or no oil and provide enough holding force.
The inner ring and the outer ring of the second oil seal 8 are contacted with the rotating piece, the inner lip of the oil seal is made of PTFE material, and a spring-free sealing structure is adopted, so that friction torque can be effectively reduced, eccentric resistance and wear resistance are required, and the requirements of the highest rotating speed of 12000rpm and bidirectional rotation are met while the sealing effect is ensured.
The relative rotational speed difference of the motor shaft 3 and the first half shaft 1 is in the range of 300rpm to 11000 rpm. In order to meet the requirements of high rotation speed, low friction and large eccentric resistance, the main lip of the second oil seal 8 is made of PTFE (polytetrafluoroethylene); the oil return line of the second oil seal 8 is a spiral line, and the oil return line is arranged on the inner circular surface of the inner ring 10 of the oil seal and is contacted with the outer circular surface of the first half shaft 1;
The coaxial electric drive bridge sealing structure is compact in structure, occupies small internal space of the speed reducer, avoids oil accumulating in the bridge pipe, reduces the lubricating oil quantity in the cavity of the speed reducer, and also avoids foreign matters in the bridge pipe from entering the cavity of the speed reducer box; the mounting position of the oil seal moves from the left end face and the right end face of the half shaft to the middle of the motor shaft 3 and the half shaft, so that abrasion of radial runout of the half shaft to the inner lip of the oil seal is reduced, the service life of the oil seal is prolonged, and the risk of oil leakage is reduced.
The first bridge pipe and the second bridge pipe are cast. As the bridge pipe is usually cast, foreign matters in the bridge pipe are prevented from entering the reduction gearbox to a certain extent, and NVH noise is generated.
Specific embodiment examples of the present utility model:
Embodiment one:
The inner ring lip of the first oil seal 7 contacts with the outer wall of the motor shaft 3, and the outer ring of the first oil seal 7 is fixed on the motor housing 5 in an interference fit manner.
When the vehicle is in the forward state, the motor shaft 3 rotates counterclockwise with a maximum rotation speed of 12000rpm, and at this time, the first oil seal 7 functions to prevent the lubricant oil of the speed reducer chamber from flowing into the motor chamber in the high speed state.
The lip of the oil seal inner ring 10 of the second oil seal 8 is contacted with the first half shaft 1, and the oil seal outer ring 11 of the second oil seal 8 is fixed on the inner hole of the motor shaft 3 in an interference fit manner.
When the vehicle is in a forward state, the motor shaft 3 rotates anticlockwise, the maximum rotation speed is 12000rpm, the transmission ratio of the speed reducer is 11.1, and the output rotation speed of the first half shaft 1 is 1080rpm at most after the speed reduction through the secondary gear.
Under the working condition, the difference between the relative rotation speed of the oil seal inner ring 10 and the oil seal outer ring 11 of the second oil seal 8 is 11020rpm at the maximum, and the function of the oil seal inner ring is to prevent the lubricating oil of the speed reducer cavity from flowing into the gap between the motor shaft 3 and the half shaft under the high-speed state and leaking to the outside of the electric drive axle shell through the gap.
Embodiment two:
the normal working state of the electric drive bridge is a drive advancing state.
When the vehicle is in an inertia forward state, the motor shaft 3 and the first half shaft 1 are in a reverse dragging working condition, steering is still kept in a counterclockwise direction, the rotating speed is low, and the first oil seal 7 and the second oil seal 8 play the same role as that of the first embodiment.
When the vehicle is in a reversing working condition, the steering direction of the motor shaft 3 is opposite to that of the first half shaft 1, and is clockwise, and at the moment, the first oil seal 7 and the second oil seal 8 meet the function of bidirectional rotation.
While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the utility model is not limited to the above embodiments, but is capable of being modified or applied directly to other applications without modification, as long as various insubstantial modifications of the method concept and technical solution of the utility model are adopted, all within the scope of the utility model.
Claims (9)
1. The coaxial electric drive bridge sealing structure comprises a first half shaft (1), a second half shaft (2), a motor assembly, a differential mechanism assembly (4) and a speed reducing mechanism, wherein the speed reducing mechanism is arranged between the motor assembly and the differential mechanism assembly (4) and is used for transmitting power generated by the motor assembly to the differential mechanism assembly (4); the motor assembly is arranged in the inner cavity of the motor shell (5); the speed reducing mechanism and the differential mechanism assembly (4) are arranged in the inner cavity of the speed reducer shell (6); the method is characterized in that: a first oil seal (7) is arranged between a motor shaft (3) and a motor shell (5) of the motor assembly; a second oil seal (8) is arranged between the motor shaft (3) and the first half shaft (1); a third oil seal (9) is arranged between the speed reducer shell (6) and the second half shaft (2).
2. The coaxial electrically driven bridge seal of claim 1, wherein: the second oil seal (8) comprises an oil seal inner ring (10) which is in contact with the first half shaft (1), and an oil seal outer ring (11) which is in interference fit with the inner hole of the motor shaft (3).
3. The coaxial electrically driven bridge seal of claim 2, wherein: the interference between the main lip of the second oil seal (8) and the motor shaft (3) is between 0.6 and 1.0 mm.
4. The coaxial electrically driven bridge seal of claim 2, wherein: and the main lip of the second oil seal (8) is made of PTFE material.
5. The coaxial electrically driven bridge seal of claim 2, wherein: the oil return line of the second oil seal (8) is a spiral line; the oil return line is arranged on the inner circular surface of the oil seal inner ring (10) and is contacted with the outer circular surface of the first half shaft (1).
6. The coaxial electrically driven bridge seal of claim 1, wherein: the first oil seal (7) adopts a spring-free oil seal structure.
7. The coaxial electrically driven bridge seal of claim 1, wherein: the first oil seal (7) is made of FKM.
8. The coaxial electrically driven bridge seal of claim 1, wherein: an oil seal inner ring (10) of the first oil seal (7) is in interference fit with the motor shaft (3); the oil seal outer ring (11) of the first oil seal (7) is in interference fit with the motor shell (5).
9. The coaxial electrically driven bridge seal of claim 1, wherein: the coaxial electric drive bridge comprises a first bridge pipe and a second bridge pipe; the first bridge pipe and the second bridge pipe are cast.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221278413U true CN221278413U (en) | 2024-07-05 |
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