Lubricating and cooling structure for bearing of oil-cooled motor

Abstract

A bearing lubricating and cooling structure of an oil-cooled motor comprises a casing of the oil-cooled motor, an end cover and a motor shaft arranged in the casing, a front bearing and a rear bearing are sleeved on the motor shaft, a main oil inlet is arranged on the casing, the casing and the end cover form a casing, a bearing cooling oil passage connected with the main oil inlet is arranged in the inner wall of the casing, and the bearing cooling oil passage is connected with the main oil inlet. The bearing cooling oil channels extend to the front bearing and the rear bearing respectively and provide cooling oil for the front bearing and the rear bearing, and due to the layout design, the cooling oil can flow to the front bearing and the rear bearing through the independent bearing cooling oil channels to lubricate and cool the front bearing and the rear bearing. Meanwhile, a front bearing chamber oil collecting groove and a rear bearing chamber oil collecting groove are formed in the front bearing and the rear bearing respectively and used for collecting cooling oil in the machine shell and guiding the cooling oil into the front bearing and the rear bearing to be reused, the cooling oil is lubricated and cooled, and resources are saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technology field for electric vehicle especially is an oil cooling motor bearing lubrication and cooling structure. BACKGROUND

[0002] New energy drive motor is currently tend to high torque power output, high speed, compact structure trend, the internal heat of motor high speed operation condition will seriously affect the electromagnetic performance and service life of motor. The current market commonly used motor cooling form has air cooling, water cooling and oil cooling, with the development of permanent magnet synchronous motor, the improvement of power density, the oil cooling mode has become the universal choice of motor cooling.

[0003] The current market commonly used oil cooling motor bearing lubrication and cooling structure mainly adopts hollow shaft, is provided with hole in bearing position, passes through oil in hollow shaft, when the rotor in the motor rotates, the oil in the cavity of hollow shaft is thrown to the bearing under the action of centrifugal force, plays the effect of lubrication and cooling. The structure usually needs to reduce the cavity with motor, and this rotor oil throwing cooling mode, although the bearing cooling and lubrication system is simplified in design, but the rotor oil throwing depends on the high speed rotating rotor and throws the oil to each part, there can be uneven distribution of oil, leading to insufficient oil flow in some areas, affecting the overall thermal balance and cooling effect of bearing. UTILITY MODEL CONTENTS

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] An oil cooling motor bearing lubrication and cooling structure, including the casing of oil cooling motor, end cover and motor shaft arranged in the casing, the motor shaft is sleeved with front bearing and rear bearing, the casing is provided with total oil inlet, the casing and the end cover form a shell, the inner wall of the shell is provided with bearing cooling oil channel, one end of the bearing cooling oil channel is communicated with the total oil inlet, the other end of the bearing cooling oil channel extends to the front bearing and the rear bearing respectively, and the front bearing and the rear bearing are provided with cooling oil. The front bearing chamber oil collecting groove and the rear bearing chamber oil collecting groove are respectively communicated with the bearing cooling oil channel.

[0006] Further, the stator core is further arranged in the casing, and a stator cooling oil path is arranged between the stator core and the casing, one end of the stator cooling oil path is communicated with the total oil inlet, and the other end of the stator cooling oil path is communicated with the front bearing chamber oil collecting groove and the rear bearing chamber oil collecting groove respectively.

[0007] Further, the front bearing chamber oil collecting groove is composed of the casing and the front bearing, and the rear bearing chamber oil collecting groove is composed of the end cover and the rear bearing.

[0008] Further, the bearing cooling oil channel comprises a front bearing cooling oil channel and a rear bearing cooling oil channel, the front bearing cooling oil channel is communicated with the front bearing chamber oil collecting groove, and the rear bearing cooling oil channel is communicated with the rear bearing chamber oil collecting groove.

[0009] Further, the front bearing is provided with a front bearing oil inlet hole, the front bearing cooling oil channel is communicated with the front bearing oil inlet hole, the rear bearing is provided with a rear bearing oil inlet hole, and the rear bearing cooling oil channel is communicated with the rear bearing oil inlet hole.

[0010] Further, the total oil inlet is arranged at the central axis of the machine shell.

[0011] Further, the total oil inlet is arranged vertically to the machine shell.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1. The bearing cooling oil channel is arranged in the inner wall of the shell body, the total oil inlet hole is arranged on the machine shell of the shell body, the bearing cooling oil channel is communicated with the total oil inlet hole and extends to the front bearing and the rear bearing in the machine shell respectively, the cooling oil is provided for the front bearing and the rear bearing, the layout design makes the bearing cooling oil circuit relatively independent, the layout design of the traditional speed reducer and the motor sharing the cavity and the cooling oil circuit passing through the hollow shaft is avoided, the bearing cooling oil circuit is directly communicated with the oil inlet hole and the bearing, the cooling liquid flow area is relatively uniform, the overall heat balance and the cooling effect are favorable, the front bearing chamber oil collecting groove and the rear bearing chamber oil collecting groove are further arranged on the front bearing and the rear bearing respectively, the cooling oil except the bearing cooling oil circuit in the machine shell can be collected and introduced to the bearing for recycling, the bearing is lubricated and cooled, and resources are saved.

[0014] 2. The bearing cooling oil channel and the stator cooling oil circuit are separated in the utility model, oil circuit partition is realized, the bearing and the stator are lubricated and cooled respectively, the oil circuit and the oil amount can be monitored and quantitatively analyzed by the technician, and CFD simulation continues to be optimized.

[0015] 3. The total oil inlet hole is arranged at the central axis of the machine shell and is arranged vertically to the machine shell, the path length of the front bearing cooling oil circuit and the rear bearing cooling oil circuit is basically consistent, the cooling oil flow area is relatively uniform, and the overall heat balance and the cooling effect of the bearing are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model.

[0017] Figure 2 It is a front bearing chamber oil collecting groove and a rear bearing chamber oil collecting groove schematic view.

[0018] Wherein, the figure mark is: motor shaft 10, casing 111, end cover 112, front bearing cooling oil channel 121, rear bearing cooling oil channel 122, total oil inlet 13, front bearing 21, rear bearing 22, front bearing oil inlet hole 211, rear bearing oil inlet hole 221, front bearing chamber oil collecting groove 212, rear bearing chamber oil collecting groove 222, stator core 30, stator front end winding 31, stator rear end winding 32, stator oil inlet hole 33, stator cooling oil circuit 34. DETAILED DESCRIPTION

[0019] The specific embodiment of the utility model is described below with reference to the drawings.

[0020] In the description of the utility model, it should be explained that if the terms such as "upper", "lower", "inner", "outer", "front", "rear" and the like indicating the orientation or position relationship appear, it is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.

[0021] Reference Figure 1 An oil-cooled motor bearing lubrication and cooling structure, comprising the casing 111 of an oil-cooled motor, the end cover 112, and the motor shaft 10 arranged in the casing 111, the total oil inlet 13 is arranged on the casing 111, the casing 111 and the end cover 112 form a shell, the front bearing 21 and the rear bearing 22 are arranged on the motor shaft 10, the bearing cooling oil channel is arranged in the inner wall of the shell, which is used for providing cooling oil for the front bearing 21 and the rear bearing 22. The bearing cooling oil channel comprises the front bearing 21 cooling oil channel 121 and the rear bearing 22 cooling oil channel 122. The front bearing 21 cooling oil channel 121 is arranged in the inner wall of the casing 111, one end of which is communicated with the total oil inlet 13, and the other end extends to the front bearing 21; the rear bearing 22 cooling oil channel 122 is arranged in the end cover 112, one end of which is communicated with the total oil inlet 13, and the other end extends to the rear bearing 22. The front bearing 21 is provided with the front bearing oil inlet hole 211 communicated with the front bearing 21 cooling oil channel 121, and the rear bearing 22 is provided with the rear bearing oil inlet hole 221 communicated with the rear bearing 22 cooling oil channel 122.

[0022] Reference Figure 1 And Figure 2 The front bearing chamber oil collecting groove 212 is formed by the front bearing 21 and the casing 111, and the rear bearing chamber oil collecting groove 222 is formed by the rear bearing 22 and the end cover 112.

[0023] Reference Figure 1 And Figure 2The stator core 30 is provided with a stator front end winding 31 and a stator rear end winding at two ends thereof. The stator cooling oil passage 34 is provided between the casing 11 and the stator core 30, one end of the stator cooling oil passage 34 is communicated with the total oil inlet 13, and the other end of the stator cooling oil passage 34 respectively extends to the stator front end winding 31 and the stator rear end winding. The cooling oil flowing through the stator cooling oil passage 34 cools the stator core 30. The bearing cooling oil passage and the stator cooling oil passage 34 are independent of each other, so that the technician can monitor the flow path of the cooling oil in a partitioned manner. The front bearing 21 and the rear bearing 22 are respectively provided with a front bearing chamber oil collecting groove 212 and a rear bearing chamber oil collecting groove 222. The stator cooling oil passage 34 flowing through the stator front end winding 31 is respectively communicated with the front bearing chamber oil collecting groove 212 and the front bearing 21 cooling oil passage 121. The stator cooling oil passage 34 flowing through the stator rear end winding is respectively communicated with the rear bearing 22 cooling oil passage 122 and the rear bearing 22 oil collecting groove. The cooling oil in the stator cooling oil passage cools the stator, and then flows into the front bearing 21 cooling chamber oil collecting groove and the rear bearing chamber oil collecting groove 222 to be reused to cool the bearings.

[0024] Referring to Figure 1 The total oil inlet 13 is arranged at the central axis of the casing 11 and is perpendicular to the casing 11. The path lengths of the front bearing 21 cooling oil passage 121 and the rear bearing 22 cooling oil passage 122 are basically the same, the flow area of the cooling oil is relatively uniform, and the thermal balance and cooling effect of the bearings are improved. Meanwhile, the end of the total oil inlet is provided with a stator oil inlet hole 33 communicated with the stator cooling oil passage 34. The path lengths of the stator cooling oil passage 34 flowing through the stator front end winding 31 and the stator rear end winding are basically the same, the cooling effects of the stator front end winding 31 and the stator rear end winding are similar, and the thermal balance of the stator core 30 is improved.

[0025] In use, the cooling oil enters the oil-cooled motor from the total oil inlet 13, is branched in the casing 11, flows downward along the stator oil inlet hole 33 to form the stator cooling oil passage 34, and flows to the front bearing 21 and the rear bearing 22 in the middle part of the total oil inlet 13 to form the front bearing cooling oil passage 121 and the rear bearing cooling oil passage 122. The cooling oil flowing through the stator front end winding 31 and the stator rear end winding 32 cools the stator, and part of the cooling oil flows to the front bearing chamber oil collecting groove 212 and the rear bearing chamber oil collecting groove 222 under the action of gravity. The cooling oil in the front bearing cooling oil passage 121 and the cooling oil in the front bearing chamber oil collecting groove 212 flow to the front bearing 21 through the front bearing oil inlet hole 211 to complete the lubrication and cooling of the front bearing 21. The cooling oil in the rear bearing cooling oil passage 122 and the cooling oil in the rear bearing chamber oil collecting groove 222 flow to the front bearing 21 through the rear bearing oil inlet hole 221 to complete the lubrication and cooling of the rear bearing 22.

[0026] The above merely is the specific implementation manner of the present application, but the design concept of the present application is not limited to this, and any non-essential change of the present application by using the concept should belong to the act of infringing the protection scope of the present application.

Claims

1. A lubrication and cooling structure for an oil-cooled motor bearing, comprising a housing of an oil-cooled motor, an end cover, and a motor shaft disposed within the housing, wherein a front bearing and a rear bearing are sleeved on the motor shaft, characterized in that: The housing has a main oil inlet. The housing and the end cover form a shell. The inner wall of the shell has a bearing cooling oil passage. One end of the bearing cooling oil passage is connected to the main oil inlet, and the other end of the bearing cooling oil passage extends to the front bearing and the rear bearing, respectively, to provide cooling oil to the front bearing and the rear bearing. The front bearing and the rear bearing are respectively provided with a front bearing chamber oil collection groove and a rear bearing chamber oil collection groove for collecting cooling oil. The front bearing chamber oil collection groove and the rear bearing chamber oil collection groove are respectively connected to the bearing cooling oil passage.

2. The oil-cooled motor bearing lubrication and cooling structure according to claim 1, characterized in that: The housing also contains a stator core, and a stator cooling oil passage is provided between the stator core and the housing. One end of the stator cooling oil passage is connected to the main oil inlet, and the other end of the stator cooling oil passage is connected to the front bearing chamber oil collection groove and the rear bearing chamber oil collection groove, respectively.

3. The lubrication and cooling structure for an oil-cooled motor bearing according to claim 1, characterized in that: The front bearing chamber oil collection groove is composed of the housing and the front bearing, and the rear bearing chamber oil collection groove is composed of the end cover and the rear bearing.

4. The lubrication and cooling structure for an oil-cooled motor bearing according to claim 1, characterized in that: The bearing cooling oil passage includes a front bearing cooling oil passage and a rear bearing cooling oil passage. The front bearing cooling oil passage is connected to the front bearing housing oil collection groove, and the rear bearing cooling oil passage is connected to the rear bearing housing oil collection groove.

5. The lubrication and cooling structure for an oil-cooled motor bearing according to claim 4, characterized in that: The front bearing is provided with a front bearing oil inlet hole, and the front bearing cooling oil passage is connected to the front bearing oil inlet hole; the rear bearing is provided with a rear bearing oil inlet hole, and the rear bearing cooling oil passage is connected to the rear bearing oil inlet hole.

6. The lubrication and cooling structure for an oil-cooled motor bearing according to claim 1, characterized in that: The main oil inlet is located at the central axis of the casing.

7. The lubrication and cooling structure for an oil-cooled motor bearing according to claim 6, characterized in that: The oil inlet is positioned perpendicular to the casing.

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