Oil-free pump rotor oil cooling motor reducer assembly

Abstract

The utility model discloses an oil-free pump rotor oil cooling motor reducer assembly, which comprises a motor shell, a stator assembly arranged in the motor shell, a motor shaft arranged at the central part of the motor shell through a bearing, a rotor iron core arranged on the motor shaft, and an oil seal arranged at the outer side of the bearing, the motor shaft is connected with the spline gear shaft through a spline; the spline gear shaft is arranged in the speed reducer shell; the motor shell and the speed reducer shell are assembled and connected through the motor front end cover, and an oil storage cavity is formed in the speed reducer shell and arranged at the end of the spline gear shaft. A bearing oil throwing hole and a rotor oil throwing hole are formed in the motor shaft; the bearing oil slinging holes are formed in conical surface parts on two sides of the motor shaft, so that the bearing oil slinging holes are inclined to the bearing; and the rotor oil throwing holes vertically face the rotor iron core. Due to the action of the spline gear shaft of the speed reducer, the motor bearing, the spline gear shaft and the rotor iron core are fully lubricated and cooled, the designed service life of the driving motor is prolonged, and the performance of the motor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy automobile industry, and in particular relates to an oil-pump-free rotor oil-cooled motor reducer assembly. Background Art

[0002] At present, most motors used in new energy vehicles are water-cooled, and the front and rear bearings of the motors are grease-lubricated. After the motor assembly has been running at high speed for a long time, the grease will overflow when the temperature of the bearings themselves rises to a certain temperature, and the heat will be transferred to the bearings when the temperature of the motor rotor rises. The maximum allowable speed of the grease-lubricated bearings is relatively low, which cannot fully meet the high-speed and long-life requirements of the drive motors used in new energy vehicles, and thus the life of the motor bearings cannot fully meet the high-speed operating requirements of the vehicle.

[0003] In recent years, the penetration rate of new energy vehicles has continued to increase. High speed and high reliability are the development direction of drive motors, and high reliability and long life drive motors are the ultimate goal of vehicle needs. Due to the harsh operating environment and high design standards of motors, grease-lubricated bearings and single water-cooled motors currently restrict the design life and performance of motors, resulting in grease-lubricated bearing water-cooled motors that cannot fully meet the high speed, long life and high performance requirements of new energy vehicles.

[0004] In response to the above-mentioned defects, the utility model patent with patent number 201822129889.X discloses a water-cooled motor front end cover bearing oil lubrication mechanism and a motor drive assembly, which conducts the lubricating oil splashed in the gearbox to the motor front end cover through an oil guide pipe. The lubricating oil lubricates the motor front end cover bearing by gravity, reduces the heat of the motor bearing and increases the service life of the motor bearing.

[0005] However, this solution has three defects: 1. The lubricating oil of the oil storage structure is introduced into the bearing chamber of the front cover of the motor through the oil channel on the motor housing. The lubricating oil completely relies on its own weight to lubricate the front cover bearing. The lubricating oil flow rate is slow and easy to clog, which may lead to insufficient lubrication of the motor bearing; 2. Iron filings and impurities in the lubricating oil will reduce the service life of the motor bearing; 3. The motor rotor assembly has no cooling function. Summary of the Invention

[0006] In response to the above-mentioned defects in the prior art, the utility model provides an oil-pump-free rotor oil-cooled motor reducer assembly, which adopts a common oil solution for the motor and the reducer. After the motor is running, the lubricating oil in the reducer oil storage chamber is pumped into the motor shaft through the spline gear shaft, and the lubricating oil is respectively transported to the front and rear end bearings of the motor, the inside of the rotor core and the spline meshing position through the oil-swinging holes on the motor shaft, so that the motor bearings can be fully lubricated and cooled, the rotor core is cooled by the lubricating oil, and the inner and outer splines of the motor reducer meshing are lubricated.

[0007] The technical solution adopted by the utility model is: an oil-pump-free rotor oil-cooled motor reducer assembly, comprising a motor housing, a stator assembly installed in the motor housing, a motor shaft installed in the center of the motor housing through a bearing, a rotor iron core installed on the motor shaft, and an oil seal installed on the outside of the bearing; the motor shaft is connected to the spline gear shaft through a spline; the spline gear shaft is arranged in the reducer housing; the motor housing and the reducer housing are assembled and connected through the motor front end cover, an oil storage chamber is provided in the reducer housing, and the oil storage chamber is provided at the end of the spline gear shaft; a bearing oil-swinging hole and a rotor oil-swinging hole are provided on the motor shaft; the bearing oil-swinging hole is opened on the conical surface on both sides of the motor shaft, so that the bearing oil-swinging hole is inclined to the bearing; and the rotor oil-swinging hole is vertically facing the rotor iron core.

[0008] Furthermore, an oil baffle is installed between the motor shaft and the bearing on a side close to the bearing, and a rotor baffle is installed on a side close to the motor shaft, and an oil-swinging groove is provided on the rotor baffle.

[0009] Furthermore, a plurality of oil pumping blades are provided inside the spline gear shaft.

[0010] Furthermore, a spline oil-slinging hole is provided at the spline connection between the spline gear shaft and the motor shaft.

[0011] Furthermore, an oil return groove and an oil return hole on the motor end cover are provided in the motor housing.

[0012] Furthermore, a magnetic plug is provided at the bottom of the oil storage cavity.

[0013] Furthermore, an oil inlet hole is designed in the middle position of the rotor core, a weight reduction hole is designed inside the rotor core, the oil inlet hole is connected to the weight reduction hole, and the rotor oil-swing holes are equal in number to the oil inlet holes and are connected.

[0014] The beneficial effects of the utility model are as follows: due to the effect of the spline gear shaft of the reducer, the motor bearings, the spline gear shaft and the rotor core are fully lubricated and cooled, thereby increasing the design life of the drive motor and thus improving the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural sectional view of the utility model;

[0016] Figure 2 This is a cross-sectional view of the motor shaft of the present utility model;

[0017] Figure 3 It is a cross-sectional view of the spline gear shaft of the present utility model;

[0018] Figure 4 This is a schematic structural diagram of the spline gear shaft of the present utility model;

[0019] Figure 5 This is a schematic structural diagram of the rotor baffle of the present invention;

[0020] Figure 6 This is the lubricating oil flow path diagram of the present utility model;

[0021] In the figure: 1-motor housing, 2-stator assembly, 3-motor shaft, 4-bearing, 5-oil baffle, 6-rotor core, 7-rotor baffle, 8-motor front end cover, 9-oil seal, 10-spline gear shaft, 11-reducer housing, 12-oil storage chamber, 13-magnetic plug, 14-motor end cover oil return hole, 15-motor housing oil return groove, 16-bearing oil throwing hole, 17-rotor oil throwing hole, 18-spline oil throwing hole, 19-oil pump blade, 20-oil throwing groove, 21-oil inlet hole, 22-weight reduction hole. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, the present invention is an oil-pump-less rotor-cooled motor-reducer assembly. It includes a motor housing 1 with a cooling water channel. A stator assembly 2 is mounted within the motor housing 1. A motor shaft 3 is mounted in the center of the motor housing 1 via bearings 4. A rotor core 6 is mounted on the motor shaft 3. An oil deflector 5 is mounted between the motor shaft 3 and the bearing 4, near the bearing 4. A rotor deflector 7 is mounted near the motor shaft 3. An oil seal 9 is mounted outside the bearing 4. The motor shaft 3 is splined to a splined gear shaft 10. The splined gear shaft 10 is mounted within a reducer housing 11. The drive motor and reducer in this invention utilize a common end cover design. The motor housing 1 and reducer housing 11 are assembled and connected via a motor front cover 8. An oil reservoir 12 is located within the reducer housing 11, located at the end of the reducer's splined gear shaft 10. The lubricating oil in the reservoir 12 is stored by the various gears of the reducer. When the motor rotates, the splined gear shaft 10 pumps the lubricating oil from the reservoir into the motor shaft 3. A magnetic plug 13 is provided at the bottom of the oil storage chamber 12. After the gears are engaged for a long time, a small amount of iron powder impurities will be generated inside the lubricating oil, which can be removed by adsorption through the magnetic plug 13, ensuring that the lubricating oil entering the motor shaft 3 is free of iron powder impurities, thereby improving the life of the motor bearings.

[0024] like Figure 2As shown, the motor shaft 3 is provided with a bearing oil-swing hole 16 and a rotor oil-swing hole 17 according to the installation position of the motor bearing and the rotor core 6. The bearing oil-swing hole 16 is opened on the conical surface of both sides of the motor shaft 3, so that the bearing oil-swing hole 16 is inclined to the bearing 4. The lubricating oil has a certain pressure through the pumping effect of the spline gear shaft 10, which can make the lubricating oil directly sprayed into the interior of the bearing 4 for sufficient lubrication and cooling; the rotor oil-swing hole 17 is vertically oriented towards the rotor core 6, so that the lubricating oil is quickly thrown into the interior of the rotor core 6 for sufficient cooling. The lubricating oil inside the rotor core 6 is thrown out through the oil-swing groove 20 around the rotor baffle 7, as shown in FIG. Figure 5 As shown, the lubricating oil is spun through the oil sling trough 20 to the ends of the stator assembly windings. Since the motor winding temperature is generally higher than the rotor temperature, the stator assembly 2 is cooled. After cooling the stator assembly windings, the lubricating oil ultimately flows into the motor housing 1. The motor housing 1 is provided with an oil return trough 15 and an oil return hole 14 in the motor end cover. The lubricating oil in the motor housing 1 flows through the oil return trough 15 and the oil return hole 14 in the motor end cover into the reducer housing 11.

[0025] like Figure 3 and Figure 4 As shown, the spline gear shaft 10 in the reducer is internally provided with a plurality of oil pumping vanes 19. When the spline gear shaft 10 rotates, the oil pumping vanes 19 pump lubricating oil into the motor shaft 3. The lubricating oil then passes through the oil-slinging holes on the motor shaft 3 to lubricate and cool the bearings and the rotor core. A spline oil-slinging hole 18 is also provided at the spline connection between the spline gear shaft 10 and the motor shaft 3 for lubricating the splines.

[0026] like Figure 6 As shown, an oil inlet hole 21 is designed in the middle position of the rotor core 6, and a weight reduction hole 22 is designed inside the rotor core 6. The oil inlet hole 21 is connected to the weight reduction hole 22, and the rotor oil-swinging holes 17 are equal in number and connected to the oil inlet hole 21, ensuring that the lubricating oil inside the motor shaft 3 flows into the rotor core weight reduction hole 22 through the oil inlet hole 21, and then enters the motor housing 1 through the oil-swinging grooves of the rotor baffles 7 at both ends of the motor rotor core 6, thereby realizing cooling of the rotor core 6 and the internal magnetic steel, and improving the performance and reliability of the motor.

[0027] The lubricating oil flow path in the present invention is as follows: the reducer lubricating oil is thrown into the oil storage chamber 12 through the rotation of each stage of gears, the lubricating oil is sucked into the inside of the motor shaft 3 through the rotation pump of the spline gear shaft 10, and the lubricating oil lubricates the cooling bearing 4, the rotor core 6 and the splines between the motor shaft 3 and the spline gear shaft 10 respectively through the various oil-throwing holes of the motor; the lubricating oil inside the motor housing 1 flows back to the reducer through the motor housing oil return groove 15 and the motor end cover oil return hole 14.

Claims

1. An oil-pump-less rotor oil-cooled motor reducer assembly, comprising a motor housing, a stator assembly mounted within the motor housing, a motor shaft mounted in the center of the motor housing via a bearing, a rotor core mounted on the motor shaft, and an oil seal mounted on the outer side of the bearing; characterized in that: The motor shaft is connected to the spline gear shaft through a spline; the spline gear shaft is arranged in the reducer housing; the motor housing and the reducer housing are assembled and connected through the motor front end cover, and an oil storage chamber is provided in the reducer housing, and the oil storage chamber is provided at the end of the spline gear shaft; the motor shaft is provided with a bearing oil-swinging hole and a rotor oil-swinging hole; the bearing oil-swinging hole is opened on the conical surface on both sides of the motor shaft, so that the bearing oil-swinging hole is inclined to the bearing; the rotor oil-swinging hole is vertically facing the rotor core.

2. The oil-cooled motor reducer assembly with an oil-free pump rotor according to claim 1, characterized in that: An oil baffle is installed between the motor shaft and the bearing on a side close to the bearing, and a rotor baffle is installed on a side close to the motor shaft. The rotor baffle is provided with an oil throwing groove.

3. The oil-cooled motor reducer assembly with an oil-free pump rotor according to claim 1, characterized in that: A plurality of oil pumping blades are arranged inside the spline gear shaft.

4. The oil-cooled motor reducer assembly with an oil-free pump rotor according to claim 1, characterized in that: A spline oil-slinging hole is provided at the spline connection between the spline gear shaft and the motor shaft.

5. The oil-cooled motor reducer assembly with an oil-free pump rotor according to claim 1, characterized in that: An oil return groove and an oil return hole on the motor end cover are provided in the motor housing.

6. The oil-cooled motor reducer assembly with an oil-free pump rotor according to claim 1, characterized in that: A magnetic plug is provided at the bottom of the oil storage cavity.

7. The oil-cooled motor reducer assembly with an oil-free pump rotor according to claim 1, characterized in that: An oil inlet hole is designed in the middle position of the rotor core, and a weight reduction hole is designed inside the rotor core. The oil inlet hole is connected to the weight reduction hole, and the rotor oil-swing holes are equal in number to the oil inlet holes and are connected.

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