An oil-cooled motor

Abstract

This invention discloses an oil-cooled motor, comprising a housing, a front cover, a rear cover, a shaft, a rotor, a front cover plate, a rear cover plate, and a stator. The oil-cooled motor has internal oil channels, including shaft oil channels, cover plate oil channels, and rotor core oil channels. The shaft oil channels are located within the shaft. The cover plate oil channels include a front cover plate oil channel on the front cover plate and a rear cover plate oil channel on the rear cover plate. One end of the shaft is an oil inlet, and an oil chamber is formed on the shaft. An oil slinger hole connecting the shaft oil channels and the oil chamber is formed on the shaft. One end of the rear cover plate oil channel connects to the oil chamber, and the other end forms a rear cover plate oil spray hole. The two ends of the rotor core oil channel are connected to the rear cover plate oil channel and the front cover plate oil channel, respectively. The front cover plate oil channel forms a front cover plate oil spray hole. An oil outlet is also provided on the housing. This application, by creating oil channels inside the motor, allows the oil to directly contact the motor's shaft, rotor core, and winding ends, directly carrying away surface heat, thus greatly improving the motor's heat dissipation capacity.

Description

Technical Field

[0001] This invention relates to the field of automotive motor technology, specifically to an oil-cooled motor. Background Technology

[0002] With rising oil prices and the increasing availability of charging infrastructure, the advantages of new energy vehicles are gradually becoming apparent. As one of the core components of new energy vehicles, automotive drive motors are increasingly developing towards higher power density and higher torque density. Motor heat dissipation has always been a major challenge in motor development. Traditional drive motor cooling technologies generally employ air cooling or water cooling. Air cooling technology is complex in structure and results in a large motor size, so it is rarely used in automotive drive motors. Water cooling technology typically involves creating water channels in the motor housing to indirectly cool the motor by cooling the housing, but its heat dissipation efficiency is not high. For high power density and high torque density motors, traditional cooling methods are no longer sufficient. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides an oil-cooled motor, comprising:

[0004] The housing has an internal mounting cavity;

[0005] End caps, including a front end cap and a rear end cap, wherein the front end cap and the rear end cap are respectively connected to both ends of the housing;

[0006] A rotating shaft is mounted in the mounting cavity of the housing via a bearing, with one end extending out of the front end cover;

[0007] The rotor includes multiple sets of rotor cores arranged around the rotating shaft;

[0008] The stator includes a stator core arranged around the outside of the rotor core, and windings are also provided on the stator core;

[0009] The cover plate includes a front cover plate and a rear cover plate, which are respectively disposed on the rotating shafts at both ends of the rotor core;

[0010] The oil passage includes a shaft oil passage, a cover plate oil passage, and a rotor core oil passage. The shaft oil passage is axially oriented inside the shaft. The cover plate oil passage includes a front cover plate oil passage on the front cover plate and a rear cover plate oil passage on the rear cover plate. The rotor core oil passage is axially oriented along multiple sets of rotor cores. The end of the shaft extending beyond the front cover is an oil inlet. An oil chamber is also formed on the shaft. An oil slinger hole is formed on the shaft, connecting the shaft oil passage and the oil chamber. One end of the rear cover plate oil passage is connected to the oil chamber, and the other end forms a rear cover plate oil spray hole aligned with one end of the winding. The two ends of the rotor core oil passage are respectively connected to the rear cover plate oil passage and the front cover plate oil passage. The front cover plate oil passage forms a front cover plate oil spray hole aligned with the other end of the winding. An oil outlet is also formed on the housing.

[0011] Furthermore, the oil passage of the rotating shaft is a blind hole opened axially along the extended end of the rotating shaft, and multiple sets of oil slingers are opened circumferentially near the bottom wall of the blind hole.

[0012] Furthermore, the oil chamber is an annular groove formed on the rotating shaft close to the oil slinger hole, and a sealing ring is also provided at the connection between the rear cover plate and the rotating shaft to seal the oil chamber.

[0013] Furthermore, both the front cover plate and the rear cover plate include a first cover plate and a second cover plate. The first cover plate includes a first bottom wall and a first side wall arranged circumferentially along the first bottom wall. The first bottom wall has a mounting hole for mounting the rotating shaft. The cover plate oil passages include multiple sets, and each set of cover plate oil passages is opened on the first side wall and the first bottom wall. The cover plate oil passages on the first bottom wall have oil passage holes that connect to the rotor core oil passages. The cover plate oil passages on the first side wall have at least one oil injection hole. The second cover plate is embedded in the first cover plate to seal the surface of the cover plate oil passages.

[0014] Furthermore, the second cover plate includes a second bottom wall, a second side wall, and an end wall. The second side wall is arranged circumferentially along the second bottom wall, and the end wall is arranged at the free end of the second side wall and parallel to the second bottom wall.

[0015] Furthermore, the injection hole is angled along the first sidewall so that it can be aligned with the winding.

[0016] Furthermore, the front cover plate and the rear cover plate both have circular cross-sections adapted to the cross-section of the rotor core, and their diameters are smaller than the diameter of the rotor core. This is to reduce assembly risks. Generally, the diameter of the cover plate can be slightly smaller than the diameter of the rotor core.

[0017] Furthermore, the oil outlet is located on the housing at one end near the oil inlet.

[0018] The advantages of this application are as follows: The provided oil-cooled motor has oil channels on the shaft. Under the action of centrifugal force, the oil enters the oil chamber through the oil-throwing hole. By setting the oil chamber to connect the oil-throwing hole and the cover plate oil channel, the assembly of the shaft and the cover plate is facilitated. The oil is divided into two paths through the cover plate oil channel. One path is sprayed out through the oil spray hole of the rear cover plate to cool one end of the winding. The other path is sprayed out through the rotor core oil channel to cool the rotor core, ensuring that the magnets do not demagnetize due to high temperature. Then, the oil passes through the front cover plate oil channel and is sprayed out through the oil spray hole of the front cover plate to cool the other end of the winding. The oil directly contacts the motor shaft, rotor core, and winding ends, directly carrying away surface heat, thus greatly improving the motor's heat dissipation capacity. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one embodiment of the oil-cooled motor of this application;

[0020] Figure 2 for Figure 1 Another perspective structural diagram;

[0021] Figure 3 for Figure 2 Sectional view of AA;

[0022] Figure 4 for Figure 1 Schematic diagram of the internal structure of the middle shell;

[0023] Figure 5 for Figure 4 A schematic diagram of the structure without the stator core and windings;

[0024] Figure 6 This is a schematic diagram of the rear cover structure;

[0025] Figure 7 for Figure 6 Another perspective structural diagram;

[0026] Figure 8 for Figure 7 BB section view;

[0027] Figure 9 for Figure 6 Schematic diagram of the first cover plate structure;

[0028] Figure 10 for Figure 1 Schematic diagram of the transfer shaft structure. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] See Figure 1-10This embodiment provides an oil-cooled motor, including a housing 10 with a mounting cavity. A front cover 11 and a rear cover 12 are respectively provided at both ends of the housing 10. The rear cover 12 also has a mounting cavity. A rotating shaft 13 is also provided inside the housing, and a rotor 14 is mounted on the rotating shaft 13. A front cover plate 17 and a rear cover plate 18 are respectively provided on the rotating shaft 13 at both ends of the rotor. A stator is provided on the outer side of the rotor 14. The oil-cooled motor has oil passages inside, including a rotating shaft oil passage 131, a cover plate oil passage, and a rotor core oil passage 141. The rotating shaft oil passage 131 is axially opened along the interior of the rotating shaft 13. The cover plate oil passage includes a front cover plate oil passage opened on the front cover plate 17 and a... The rear cover plate oil passage 1814 on the rear cover plate 18 and the rotor core oil passage 141 are axially opened along multiple sets of rotor cores 142. The end of the shaft 131 extending out of the front cover is the oil inlet 132. An oil chamber 134 is also formed on the shaft. An oil sling hole 133 connecting the shaft oil passage and the oil chamber is opened on the shaft. One end of the rear cover plate oil passage 1814 is connected to the oil chamber 134, and the other end forms a rear cover plate oil spray hole 1813 aligned with the rear end of the winding. The two ends of the rotor core oil passage 141 are connected to the rear cover plate oil passage and the front cover plate oil passage, respectively. The front cover plate oil passage forms a front cover plate oil spray hole aligned with the front end of the winding 16. An oil outlet 101 is also opened on the housing 10.

[0031] Specifically, the rotor 14 includes multiple sets of rotor cores 142 arranged in parallel, and the stator includes stator cores 15 arranged around the multiple sets of rotor cores 142. The stator core 15 is also provided with windings 16, with both ends of the windings protruding from the stator cores. The rear end of the windings is located in the mounting cavity of the rear end cover 12, and the end of the shaft 13 is located in the mounting cavity of the rear end cover 12, while the front end extends out of the front end cover 11. The two ends of the shaft are respectively connected to the front end cover and the rear end cover through bearings 20.

[0032] Specifically, the oil passage of the rotating shaft 131 is a blind hole opened axially along the extended end of the rotating shaft. Multiple sets of oil throwing holes 133 are evenly opened circumferentially near the bottom wall of the blind hole. The oil chamber 134 is an annular groove opened on the rotating shaft close to the oil throwing hole 133. An annular boss 134 is also provided on the rotating shaft on the other side of the oil chamber. An annular mounting groove 135 is opened on the annular boss 134. A sealing ring is provided in the mounting groove 135 for the connection between the rear cover plate 18 and the rotating shaft, thereby sealing the oil chamber. In addition, an external thread 136 is provided on the rotating shaft near the oil inlet 132. A locking nut 19 is provided at the connection between the rotating shaft and the front cover plate 17. The locking nut 19 cooperates with the external thread 136 to fix the rotating shaft and the front cover plate.

[0033] Since the front cover plate 17 and the rear cover plate 18 have the same structure, this embodiment will use the rear cover plate as an example. The rear cover plate 18 includes a first cover plate 181 and a second cover plate 182. The first cover plate 181 includes a first bottom wall 1811 and a first side wall 1812 arranged circumferentially along the first bottom wall. The first bottom wall 1811 has mounting holes 183 for mounting a rotating shaft. The cover plate oil passages 1814 include multiple sets, each set is opened on the first side wall and the first bottom wall, and the sets are evenly spaced. The cover plate oil passages 1814 on the first bottom wall 1811 have connecting holes for the rotating shaft. The oil passage 1815 of the iron core oil passage, at least one oil injection hole 1813 is opened in the cover plate oil passage of the first side wall 1812, the second cover plate 182 includes a second bottom wall 1821, a second side wall 1822 and an end wall 1823, the second side wall is arranged circumferentially along the second bottom wall, the end wall is arranged at the free end of the second side wall and parallel to the second bottom wall, the second bottom wall 1821 covers the first bottom wall 1811, the second side wall 1822 covers the inner side of the first side wall 1812, and the end wall 1823 covers the end of the first side wall. The first cover plate and the second cover plate are welded together.

[0034] Preferably, two oil injection holes 1813 are provided in the cover plate oil passage on each side wall. Each oil injection hole 1813 is inclined along the first side wall so that it can be aligned with the winding. The angle between the inclined direction of the oil injection hole and the plane where the first bottom wall is located is 30°-60°. One end of the cover plate oil passage on the first bottom wall extends to the position of the mounting hole 183, and one end of the cover plate oil passage on the first side wall extends to the edge of the first side wall. The end extending to the mounting hole forms an oil inlet 184, and the oil passage hole 1815 is provided near the mounting hole.

[0035] In addition, the cross-sections of the front cover plate and the rear cover plate are both circular cross-sections adapted to the cross-section of the rotor core, and the diameter is slightly smaller than the diameter of the rotor core, generally 0.4mm smaller is sufficient. The oil outlet 101 is opened on the housing near the oil inlet 132. The oil at the rear end of the winding can flow to the oil outlet at the front end through the gap between the windings. There can be more than one oil outlet. In order to facilitate the flow of oil at the rear end of the winding, an oil outlet can also be set at the rear end of the housing.

[0036] Working principle: The oil enters through the oil inlet 132 on the rotating shaft 13. Under the action of centrifugal force, the oil enters the oil chamber through the oil throwing hole. The oil is divided into two paths through the cover plate oil passage. One path is sprayed out through the oil spray hole of the rear cover plate to cool one end of the winding. The other path of oil passes through the rotor core oil passage to cool the rotor core, ensuring that the magnets will not demagnetize due to high temperature. Then, the oil passes through the front cover plate oil passage and is sprayed out from the oil spray hole of the front cover plate to cool the other end of the winding. Finally, the oil flows out from the oil outlet and is collected for recycling.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oil-cooled motor, characterized in that, include: The housing has an internal mounting cavity; End caps, including a front end cap and a rear end cap, wherein the front end cap and the rear end cap are respectively connected to both ends of the housing; A rotating shaft is mounted in the mounting cavity of the housing via a bearing, with one end extending out of the front end cover; The rotor includes multiple sets of rotor cores arranged around the shaft. The stator includes a stator core arranged around the outside of the rotor core, and windings are also provided on the stator core; The cover plate includes a front cover plate and a rear cover plate, which are respectively disposed on the rotating shafts at both ends of the rotor core; The oil passage includes a shaft oil passage, a cover plate oil passage, and a rotor core oil passage. The shaft oil passage is axially opened inside the shaft. The cover plate oil passage includes a front cover plate oil passage opened on the front cover plate and a rear cover plate oil passage opened on the rear cover plate. The rotor core oil passage is axially opened along multiple sets of rotor cores. The end of the shaft extending out of the front cover is an oil inlet. An oil chamber is also formed on the shaft. An oil slinger hole is opened on the shaft, connecting the shaft oil passage and the oil chamber. One end of the rear cover plate oil passage is connected to the oil chamber, and the other end forms a rear cover plate oil spray hole aligned with one end of the winding. The two ends of the rotor core oil passage are respectively connected to the rear cover plate oil passage and the front cover plate oil passage. The front cover plate oil passage forms a front cover plate oil spray hole aligned with the other end of the winding. An oil outlet is also opened on the housing. Both the front cover plate and the rear cover plate include a first cover plate and a second cover plate. The first cover plate includes a first bottom wall and a first side wall arranged circumferentially along the first bottom wall. The first bottom wall has a mounting hole for mounting the rotating shaft. The cover plate oil passage includes multiple sets. Each set of cover plate oil passages is opened on the first side wall and the first bottom wall. The cover plate oil passage on the first bottom wall has an oil passage hole that connects to the rotor core oil passage. The cover plate oil passage on the first side wall has at least one oil injection hole. The second cover plate is embedded in the first cover plate to seal the surface of the cover plate oil passage. The second cover plate includes a second bottom wall, a second side wall, and an end wall. The second side wall is arranged circumferentially along the second bottom wall, and the end wall is arranged at the free end of the second side wall and parallel to the second bottom wall. The injection hole is angled along the first sidewall so that it can be aligned with the winding.

2. The oil-cooled motor according to claim 1, characterized in that: The oil passage of the rotating shaft is a blind hole opened axially along the extended end of the rotating shaft, and multiple sets of oil throwing holes are opened circumferentially near the bottom wall of the blind hole.

3. The oil-cooled motor according to claim 2, characterized in that: The oil chamber is an annular groove formed on the rotating shaft, close to the oil-throwing hole.

4. An oil-cooled motor according to claim 3, characterized in that: A sealing ring is also provided at the connection between the rear cover plate and the rotating shaft to seal the oil chamber.

5. An oil-cooled motor according to claim 1, characterized in that: The front cover plate and the rear cover plate both have circular cross-sections adapted to the cross-section of the rotor core, and their diameters are smaller than the diameter of the rotor core.

6. An oil-cooled motor according to claim 1, characterized in that: The oil outlet is located on the housing at one end near the oil inlet.

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