CN212690762U - Structure for cooling motor shaft and lubricating spline - Google Patents
Structure for cooling motor shaft and lubricating spline Download PDFInfo
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- CN212690762U CN212690762U CN202021441075.0U CN202021441075U CN212690762U CN 212690762 U CN212690762 U CN 212690762U CN 202021441075 U CN202021441075 U CN 202021441075U CN 212690762 U CN212690762 U CN 212690762U
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Abstract
The utility model discloses a structure for cooling a motor shaft and lubricating splines, which comprises a reducer shaft and a motor shaft in spline fit connection with the reducer shaft, wherein an external spline of the reducer shaft is matched with an internal spline of the motor shaft to form a spline fit clearance; the front end and the rear end of the speed reducer shaft are respectively provided with an oil inlet port and an oil outlet port, a first oil hole communicated with the oil inlet port and the oil outlet port is formed in the speed reducer shaft, and a first return oil duct flowing through a spline fit clearance is formed in the periphery of the first oil hole; an oil duct cavity which is simultaneously communicated with an oil outlet of the speed reducer shaft and the first return oil duct is arranged in the motor shaft in front of the speed reducer shaft along the axial direction; an oil inlet port of the speed reducer shaft is communicated with the reduction gearbox, and the inner wall of the first oil hole is provided with a forward oil pushing groove which pushes the lubricating oil flowing into the oil inlet port from the reduction gearbox forward in a spiral shape. The motor shaft lubrication device has the advantages that the problem that the temperature of a motor rotor, particularly a motor shaft, is too high is obviously improved, and meanwhile, the problem that the spline matching part of the motor shaft and the speed reducer shaft cannot be effectively lubricated is thoroughly solved.
Description
Technical Field
The utility model relates to a motor heat dissipation that is connected with the derailleur among the new forms of energy electric automobile and the flower of connecting portion spline are lubricated, concretely relates to motor shaft cooling and lubricated structure of spline belongs to electric automobile technical field.
Background
Among the new energy automobile power assembly system, natural cooling system or water cooling system are adopted mostly to the electric machine module, to these two kinds of systems, on its cooling mainly let the heat conduction of motor stator, rotor to motor casing through the heat-conduction mode, then the heat is taken away to the coolant liquid through the cooling fin release heat on the motor casing on the rethread or in the motor casing water course. However, the motor rotor is far away from the heat dissipation shell compared with the motor stator, the temperature is always higher than the temperature of the motor stator, especially, the temperature of a rotor shaft core (motor shaft) is higher, the motor efficiency is reduced due to the overhigh temperature of the motor rotor, and even the magnetic steel of the motor rotor is irreversibly demagnetized. In addition, the motor shaft and the reducer shaft are in spline fit connection, the spline fit position is an embarrassing position for self lubrication, only one end of the spline fit position is communicated with a transmission box rich in lubricating oil, the axial length of spline teeth is long, the lubricating oil in the transmission box cannot flow back after entering between the teeth matched with the inner spline and the outer spline, and the lubricating oil which cannot flow back can fail to form dead oil after being used for a long time. Therefore, grease lubrication is generally adopted, but the grease lubrication also causes local wear of the spline due to uneven distribution and smearing of preset grease during operation and evaporation of the grease, which can adversely affect lubrication of the spline and further reduce the service life of a power assembly system.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the problem that the temperature is too high due to the fact that the motor rotor is far away from the heat dissipation shell and cannot be directly provided with a cooling system and the problem that effective lubrication cannot be formed at the spline matching position of the motor shaft and the speed reducer shaft.
To with above-mentioned problem, the utility model provides a technical scheme is:
a structure for cooling a motor shaft and lubricating splines comprises a speed reducer shaft positioned in a gearbox and the motor shaft positioned in a motor and connected with the speed reducer shaft in a spline fit mode, wherein an external spline of the speed reducer shaft is matched with an internal spline of the motor shaft to form a spline fit clearance; the front end and the rear end of the speed reducer shaft are respectively provided with an oil inlet port and an oil outlet port, a first oil hole communicated with the oil inlet port and the oil outlet port is formed in the speed reducer shaft, and a first return oil duct flowing through a spline fit clearance is formed in the periphery of the first oil hole; an oil duct cavity which is simultaneously communicated with an oil outlet of the speed reducer shaft and the first return oil duct is arranged in the motor shaft in front of the speed reducer shaft along the axial direction; the oil inlet port of the speed reducer shaft is communicated with the speed reducer, and the inner wall of the first oil hole of the speed reducer shaft is provided with a forward oil pushing groove which pushes the lubricating oil flowing into the oil inlet port from the speed reducer forward in a spiral shape.
Furthermore, an oil guide pipe is arranged in the oil duct cavity of the motor shaft, the front end and the rear end of the oil guide pipe are respectively provided with an oil receiving port and an oil return port, an oil hole II for communicating the oil receiving port with the oil return port is formed in the oil guide pipe, and a return oil duct II is arranged on the periphery of the oil hole II; an oil receiving port of an oil guide pipe in the motor shaft is communicated with an oil outlet port of the speed reducer shaft, an oil return port of the oil guide pipe is communicated with a return oil channel II, and the return oil channel II is communicated with the return oil channel I.
Further, the return oil duct is a return oil pushing groove spirally wound around the oil guide pipe, one end of the return oil pushing groove is communicated with an oil return port of the oil guide pipe, and the other end of the return oil pushing groove is communicated with the spline fit clearance.
Furthermore, an oil return groove is formed in the peripheral surface of the smooth surface supporting table on the periphery of the speed reducer shaft, the front end of the oil return groove is communicated with the spline fit clearance to form the first return oil duct, the rear end of the oil return groove is an oil return terminal, and the oil return terminal is communicated with the speed reducer.
Furthermore, a rear shell where the bearing seat at the rear end of the speed reducer shaft is located is provided with a flow collecting groove for blocking and capturing splashed lubricating oil, and the lower end of the flow collecting groove is communicated to the bottom of the bearing seat at the rear end of the speed reducer shaft.
Furthermore, an oil conveying groove pipe is arranged at the bottom of the bearing seat at the rear end of the speed reducer shaft below the lower end port of the flow collecting groove, and the front end of the oil conveying groove pipe extends into the first oil hole in front of the oil inlet port of the speed reducer shaft.
Furthermore, a check ring with an inner ring wall is arranged on the inner wall of the oil hole close to the oil inlet port, and the front end of the oil conveying groove pipe extending into the oil inlet port of the speed reducer shaft extends into the oil hole I through a hole in the center of the check ring.
The utility model has the advantages that: the problem that the temperature of a motor rotor, particularly a motor shaft, is too high is obviously improved, and the problem that effective lubrication cannot be formed at the spline matching part of the motor shaft and the speed reducer shaft is thoroughly solved.
Drawings
FIG. 1 is a schematic cross-sectional view of a retarder showing the positions of the retarder shaft and motor shaft, etc. within the retarder;
FIG. 2 is a partial schematic view of FIG. 1, wherein the ellipse is the boundary between the partial and the overall view, not the structure of the present invention;
FIG. 3 is a perspective view of the rear housing of the transmission illustrating the location and arrangement of the sump and sump pipes;
FIG. 4 is a schematic cross-sectional view of a reducer shaft;
FIG. 5 is a perspective view of a reducer shaft;
FIG. 6 is a schematic cross-sectional view of an oil guide tube.
In the figure: 1. a rear housing; 2. a front housing; 3. a reduction gearbox; 4. a reducer shaft; 41. an external spline; 42. a smooth surface support table; 43. an oil return groove; 44. an oil return terminal; 45. an oil inlet port; 46. a retainer ring; 47. a first oil hole; 48. an oil outlet port; 49. pushing the oil groove in the forward direction; 5. a motor shaft; 51. an oil passage cavity; 52. an oil guide pipe; 53. an oil receiving port; 54. an oil return port; 55. an oil hole II; 56. returning to the oil pushing groove; 6. spline fit clearance; 7. a collecting groove; 8. oil transportation groove pipe.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in figure 1, the reduction gearbox 3 is a relatively closed space, lubricating oil with a certain depth is arranged at the lower part in the gearbox, the lower part of the main reduction gear in the gearbox is immersed in the lubricating oil, the lubricating oil is splashed in the reduction gearbox 3 by utilizing the high-speed running of the main reduction gear, and other gears in the reduction gearbox 3 and bearings of gear shafts are directly or indirectly lubricated by the lubricating oil.
As shown in fig. 1, 2 and 4, a motor as a power source is installed outside the front reducer casing 2, a motor shaft 5 of the motor is connected with a reducer shaft 4 of which the main body is positioned in the reducer casing 3 in a spline fit manner, and a replacement part positioned on the reducer shaft 4 is generally an external spline 41. Since the spline fit always has a certain clearance, it is referred to herein as a spline fit clearance 6. Behind the external splines 41 of the reducer shaft 4 is a smooth support table 42 for supporting the connection between the reducer shaft 4 and the motor shaft 5. The rear end of the reducer shaft 4 is mounted on the rear bearing position of the reducer shaft 4 arranged on the reducer rear shell 1 through a bearing.
The utility model discloses a scheme is, it uses the oil feed port 45 who establishes at 4 rear end axle core positions of reduction gear axle to construct one as the lubricating oil entry, use 4 periphery plain noodles supporting bench 42 backs of reduction gear axle to be oil return terminal 44, midway toward the 4 axle centers of reduction gear axle of flowing through in proper order, 5 axle centers of motor shaft, return to 5 front ends of motor shaft of flowing through in proper order, 5 peripheries of motor shaft, spline fit clearance 6, the smooth noodles supporting bench 42 periphery toward the runner that returns, utilize the lubricating oil that constantly comes and goes to flow to realize the cooling to motor shaft 5 and to the lubrication between 5 internal splines of motor shaft and the 4 external splines 41 of reduction gear axle.
The reason why the temperature of the motor shaft 5 is reduced by the lubricating oil which continuously flows back and forth is that the temperature of the lubricating oil in the reduction gearbox 3 is about 30-40 ℃ lower than that of the motor shaft 5.
A structure for cooling a motor shaft 5 and lubricating splines comprises a speed reducer shaft 4 positioned in a gearbox and the motor shaft 5 positioned in a motor and connected with the speed reducer shaft 4 in a spline fit mode, wherein an external spline 41 of the speed reducer shaft 4 is matched with an internal spline of the motor shaft 5 to form a spline fit gap 6; the front end and the rear end of the reducer shaft 4 are respectively provided with an oil inlet port 45 and an oil outlet port 48, an oil hole I47 communicated with the oil inlet port 45 and the oil outlet port 48 is arranged in the reducer shaft, and the periphery of the reducer shaft is provided with a return oil duct I flowing through the spline fit clearance 6; an oil channel cavity 51 which is simultaneously communicated with the oil outlet 48 of the speed reducer shaft 4 and the first return oil channel is axially arranged in the motor shaft 5 in front of the speed reducer shaft 4; the oil inlet port 45 of the reducer shaft 4 is communicated with the reduction gearbox 3, and the inner wall of the first oil hole 47 of the reducer shaft 4 is provided with a forward oil pushing groove 49 which pushes the lubricating oil flowing into the oil inlet port 45 from the reduction gearbox 3 forward in a spiral shape. The forward oil pushing groove 49 acts on the principle that the lubricating oil entering the first oil hole 47 flows forward under the action of gravity on the lubricating oil and forward guiding is formed by continuous rotation of the forward oil pushing groove 49. Therefore, the lubricating oil flows into the oil duct cavity 51 of the motor shaft 5 through the oil inlet port 45 and the oil hole I47, then flows through the oil duct cavity 51 through the return oil duct I comprising the spline fit clearance 6 and returns to the reduction gearbox 3, and the temperature of the lubricating oil in the reduction gearbox is lower than that of the motor shaft 5, so that the motor shaft 5 can be cooled. At the same time, the outer spline 41 of the reducer shaft 4 and the inner spline of the motor shaft 5 are lubricated by the lubricating oil flowing through the spline fitting clearance 6.
However, the above-mentioned effects can be ensured and maximized by further optimizing and improving the scheme as follows.
As shown in fig. 2, 4 and 6, in order to make the lubricating oil flow forward and deeply into the front end of the oil channel cavity 51 of the motor shaft 5, an oil guide pipe 52 is arranged in the oil channel cavity 51 of the motor shaft 5, the front end and the rear end of the oil guide pipe 52 are respectively provided with an oil receiving port 53 and an oil return port 54, the oil guide pipe 52 is internally provided with a second oil hole 55 communicating the oil receiving port 53 and the oil return port 54, and the outer periphery of the second oil hole is provided with a second return oil channel; an oil receiving port 53 of an oil guide pipe 52 in the motor shaft 5 is communicated with an oil outlet port 48 of the reducer shaft 4, an oil return port 54 of the oil guide pipe 52 is communicated with a second return oil channel, and the second return oil channel is communicated with the first return oil channel. Thus, the lubricating oil can flow to the front end of the oil passage cavity 51 of the motor shaft 5 to the maximum extent along the second oil hole 55 and the oil return port 54. And then returns through the return oil duct II, so that the whole motor shaft 5 can be cooled as much as possible.
The second return oil passage is a return oil pushing groove 56 spirally wound around the outer periphery of the oil guide pipe 52, one end of the return oil pushing groove 56 is communicated with the oil return port 54 of the oil guide pipe 52, and the other end is communicated with the spline fitting gap 6. As the oil conduit 52 rotates, the lubricating oil in the return thrust oil groove 56 returns backward at the outer periphery of the oil conduit 52.
The lubricating oil returning backwards continues to flow backwards through the spline fit clearance 6 of the first return oil channel.
An oil return groove 43 is formed in the outer peripheral surface of a smooth surface supporting platform 42 on the periphery of the speed reducer shaft 4 in the spline fit clearance 6, the front end of the oil return groove 43 is communicated with the spline fit clearance 6 to form the first return oil channel, the rear end of the oil return groove 43 is an oil return terminal 44, and the oil return terminal 44 is communicated with the speed reducer 3. The oil returning through the spline fitting gap 6 flows backwards through the oil returning groove 43 and finally flows back into the reduction gearbox 3 from the rear end of the oil returning groove 43 as an oil returning terminal 44.
Next, we turn back to how to adopt the technical means to make the lubricating oil in the reduction box flow into the above-mentioned back-and-forth flow channel.
As shown in fig. 1, 2, 3 and 4, a collecting tank 7 for blocking and capturing splashed lubricating oil is provided on the rear housing 1 where the bearing seat at the rear end of the reducer shaft 4 is located, and the lower end of the collecting tank 7 is led to the bottom of the bearing seat at the rear end of the reducer shaft 4. The splashed lubricating oil blocked and captured is guided to the bottom of the bearing seat at the rear end of the speed reducer shaft 4 through the flow collecting groove 7.
An oil delivery groove pipe 8 with an upward groove opening is arranged at the bottom of a bearing seat at the rear end of the speed reducer shaft 4 below the lower end port of the collecting groove 7, and lubricating oil flowing down from the collecting groove 7 is received. The front end of the oil delivery groove pipe 8 extends into the oil hole I47 in front of the oil inlet port 45 of the speed reducer shaft 4 and is used for delivering lubricating oil flowing down from the collecting groove 7 to the oil hole I47 through the oil delivery groove pipe 8.
In order to ensure that the lubricating oil delivered to the first oil hole 47 through the oil delivery groove pipe 8 does not flow back, a retaining ring 46 with an annular inner wall is arranged on the inner wall of the first oil hole 47 close to the oil inlet port 45, and the front end of the oil delivery groove pipe 8 extending into the oil inlet port 45 of the reducer shaft 4 extends into the first oil hole 47 through a hole in the center of the retaining ring 46.
The above embodiments are only for the purpose of more clearly describing the invention and should not be considered as limiting the scope of protection covered by the invention, any modification of the equivalent should be considered as falling within the scope of protection covered by the invention.
Claims (7)
1. A structure for cooling a motor shaft and lubricating splines comprises a speed reducer shaft (4) positioned in a gearbox and a motor shaft (5) positioned in a motor and connected with the speed reducer shaft (4) in a spline fit mode, wherein an external spline (41) of the speed reducer shaft (4) is matched with an internal spline of the motor shaft (5) to form a spline fit clearance (6); the method is characterized in that: the front end and the rear end of the reducer shaft (4) are respectively provided with an oil inlet port (45) and an oil outlet port (48), an oil hole I (47) communicated with the oil inlet port (45) and the oil outlet port (48) is arranged in the reducer shaft, and the periphery of the reducer shaft is provided with a return oil duct I flowing through the spline fit clearance (6); an oil channel cavity (51) which is simultaneously communicated with the oil outlet port (48) of the speed reducer shaft (4) and the first return oil channel is arranged in the motor shaft (5) in front of the speed reducer shaft (4) along the axial direction; an oil inlet port (45) of the speed reducer shaft (4) is communicated with the speed reducer (3), and a forward oil pushing groove (49) for pushing forward lubricating oil flowing into the oil inlet port (45) from the speed reducer (3) in a spiral shape is arranged on the inner wall of an oil hole I (47) of the speed reducer shaft (4).
2. The structure for cooling a motor shaft and lubricating a spline according to claim 1, wherein: an oil guide pipe (52) is arranged in an oil passage cavity (51) of the motor shaft (5), the front end and the rear end of the oil guide pipe (52) are respectively provided with an oil receiving port (53) and an oil return port (54), the oil guide pipe (52) is internally provided with a second oil hole (55) communicated with the oil receiving port (53) and the oil return port (54), and the periphery of the second oil hole is provided with a second return oil passage; an oil receiving port (53) of an oil guide pipe (52) in the motor shaft (5) is communicated with an oil outlet port (48) of the speed reducer shaft (4), an oil return port (54) of the oil guide pipe (52) is communicated with a second return oil channel, and the second return oil channel is communicated with the first return oil channel.
3. The structure for cooling a motor shaft and lubricating a spline according to claim 2, wherein: and the periphery of the second return oil channel is spirally wound around the return oil pushing groove (56) of the oil guide pipe (52), one end of the return oil pushing groove (56) is communicated with an oil return port (54) of the oil guide pipe (52), and the other end of the return oil pushing groove is communicated with the spline fit clearance (6).
4. The structure for cooling a motor shaft and lubricating a spline according to claim 2, wherein: an oil return groove (43) is formed in the outer peripheral surface of a smooth surface supporting table (42) on the periphery of the speed reducer shaft (4), the front end of the oil return groove (43) is communicated with the spline fit clearance (6) to form a first return oil duct, an oil return terminal (44) is arranged at the rear end of the oil return groove (43), and the oil return terminal (44) is communicated with the speed reducer (3).
5. The structure for cooling a motor shaft and lubricating a spline according to claim 1, wherein: the rear shell (1) where the rear end bearing seat of the speed reducer shaft (4) is located is provided with a flow collecting groove (7) for blocking and capturing splashed lubricating oil, and the lower end of the flow collecting groove (7) leads to the bottom of the rear end bearing seat of the speed reducer shaft (4).
6. The structure for cooling a motor shaft and lubricating a spline according to claim 5, wherein: an oil conveying groove pipe (8) arranged below the notch is arranged at the bottom of a bearing seat at the rear end of the speed reducer shaft (4) below the lower end port of the flow collecting groove (7), and the front end of the oil conveying groove pipe (8) extends into an oil hole I (47) in front of an oil inlet port (45) of the speed reducer shaft (4).
7. The structure for cooling a motor shaft and lubricating a spline according to claim 6, wherein: a retainer ring (46) with an annular inner wall is arranged on the inner wall of a first oil hole (47) close to an oil inlet port (45), and the front end of an oil conveying groove pipe (8) extending into the oil inlet port (45) of the speed reducer shaft (4) extends into the first oil hole (47) through a hole in the center of the retainer ring (46).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021441075.0U CN212690762U (en) | 2020-07-21 | 2020-07-21 | Structure for cooling motor shaft and lubricating spline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021441075.0U CN212690762U (en) | 2020-07-21 | 2020-07-21 | Structure for cooling motor shaft and lubricating spline |
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| Publication Number | Publication Date |
|---|---|
| CN212690762U true CN212690762U (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021441075.0U Active CN212690762U (en) | 2020-07-21 | 2020-07-21 | Structure for cooling motor shaft and lubricating spline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370494A (en) * | 2022-01-17 | 2022-04-19 | 上海电气集团股份有限公司 | Automobile reduction gearbox and automobile |
| CN114370494B (en) * | 2022-01-17 | 2024-05-31 | 上海电气集团股份有限公司 | Automobile reduction gearbox and automobile |
-
2020
- 2020-07-21 CN CN202021441075.0U patent/CN212690762U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370494A (en) * | 2022-01-17 | 2022-04-19 | 上海电气集团股份有限公司 | Automobile reduction gearbox and automobile |
| CN114370494B (en) * | 2022-01-17 | 2024-05-31 | 上海电气集团股份有限公司 | Automobile reduction gearbox and automobile |
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