Motor cooling system, motor and electric vehicle

Abstract

A motor cooling system includes a motor housing, an oil injection pump, a stator cooling sleeve, a stator, a rotor, a hollow shaft, an oil pipeline, and an end cover. In this motor cooling solution, the cooling oil enters the cooling path planned inside the motor through the oil pipeline, which can cool the motor rotor and the motor stator, and can realize the recycling of the cooling oil, with good cooling effect and good application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of motor cooling, and in particular to a motor cooling system, a motor and an electric vehicle. Background Art

[0002] New energy vehicles have made great progress in recent years, and automotive motors are particularly important as power providers for new energy vehicles. When the motor is working, the working current is large and the speed is high, so the motor itself will generate a lot of heat. The current motor cooling methods are limited, and the cooling effect is not obvious, so it is difficult to reduce the high temperature inside the motor. The high temperature inside the motor will have a certain impact on the stable operation of the motor, and even bring disaster to new energy vehicles, so it is particularly important to cool the automotive motor.

[0003] Currently, there are two main cooling methods. One is the air cooling structure, but the air cooling structure consumes a lot of energy and the cooling effect is not ideal; the other is the water cooling structure, but the coolant used in the water cooling mechanism is prone to leakage and poses a safety hazard. Summary of the invention

[0004] Based on this, it is necessary to provide an oil-cooled motor cooling system with good cooling effect, safety and stability to address the problems of the above-mentioned air-cooling structure and water-cooling structure.

[0005] A motor cooling system comprises a motor housing, a fuel injection pump, a stator cooling jacket, a stator, a rotor, a hollow shaft, an oil delivery pipe, and an end cover, wherein the hollow shaft is sleeved outside the oil delivery pipe, the rotor is sleeved outside the hollow shaft and is fixedly and non-rotatably connected to the hollow shaft, the stator is sleeved outside the rotor and remains stationary relative to the motor housing, the stator cooling jacket is sleeved on the outer periphery of the stator, the end cover is connected to the motor housing and is opposite to the axial end faces of the rotor and the stator; the end cover is provided with a guide channel with an opening in the direction opposite to gravity, The oil delivery pipe is communicated with the guide channel; a cooling water channel is formed on the motor housing, and the guide channel is communicated with the cooling water channel; the fuel injection pump is installed on the motor housing, and the fuel injection pump includes an oil inlet end communicated with the cooling water channel and an fuel injection end facing the stator cooling sleeve, and the stator cooling sleeves located on both sides of the hollow shaft in the gravity direction are respectively provided with upper guide holes and lower oil leakage holes; the upper guide hole connects the fuel injection end and the stator surface, and an oil discharge hole communicated with the lower oil leakage hole is provided at one end of the end cover away from the guide channel.

[0006] In one embodiment, the motor housing includes a housing inner wall, a housing outer wall, and an end wall connected between the axial ends of the housing inner wall and the housing outer wall, and the housing inner wall, the housing outer wall, and the housing end wall define the cooling water channel; the end wall near one end of the guide channel is provided with a connecting hole connecting the cooling water channel and the guide channel.

[0007] In one embodiment, an oil leakage channel is defined between the inner wall of the housing and the stator protective cover, the oil leakage channel surrounds the outer circumference of the stator protective cover and is spaced apart from the cooling water channel, and the oil leakage channel is connected between the lower oil leakage hole and the oil drain hole.

[0008] In one of the embodiments, an oil retaining groove with an opening in a direction opposite to gravity is provided on the surface of the end cover facing the axial end faces of the stator and the rotor, and the oil retaining groove includes a semicircular protrusion and two ribs connected to the semicircular protrusion, and the semicircular protrusion and the two ribs are in contact with the axial end faces of the stator and the rotor and jointly define the guide channel.

[0009] In one embodiment, the motor cooling system further includes a drive motor, which is connected to the oil pipeline and is used to provide power for supplying cooling oil to the oil pipeline.

[0010] In one embodiment, the motor cooling system also includes a bearing and a bearing seat, the bearing sleeve is arranged at both ends of the hollow shaft, the bearing is assembled on the bearing seat, the bearing seat is assembled on the motor housing, and the end of the oil pipe close to the end cover is connected to the center of the bearing seat.

[0011] In one of the embodiments, the motor cooling system further includes a cooling device, which includes an oil outlet and an oil return port, the oil outlet is connected to the oil pipeline, and the oil return port is connected to the oil drain hole.

[0012] In one of the embodiments, heat dissipation threads are also provided on the outer wall of the motor housing.

[0013] A motor comprises any one of the motor cooling systems described above.

[0014] An electric vehicle comprises any one of the above-mentioned motor cooling systems.

[0015] In the motor cooling system of the present invention, the oil delivery pipe brings cold lubricating oil to the hollow shaft. The interference fit connection between the hollow shaft and the motor rotor can take away a part of the heat of the motor rotor. The oil delivery pipe is connected with the guide channel. When working, under the centrifugal force of the hollow pipe and the rotor, the lubricating oil enters the cooling water channel through the guide channel. The oil injection pump sprays the lubricating oil in the cooling water channel onto the stator protection cover. The lubricating oil will enter the guide holes on the stator protection cover. Under the action of gravity, the lubricating oil will flow to the surface of the stator and gather at the bottom, thereby cooling the stator. In addition, the lubricating oil gathered at the bottom is discharged from the motor through the oil discharge hole on the end cover for recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of a motor cooling system in one embodiment of the present invention;

[0017] Figure 2 for Figure 1 A partial schematic diagram of the motor cooling system is shown;

[0018] Figure 3 for Figure 1 Schematic diagram of the end cover of the motor cooling system shown. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an element between the two. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element between the two at the same time.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] See also Figure 1 In one embodiment of the present invention, the motor cooling system 100 includes a motor housing 10, a fuel injection pump 20, a stator cooling jacket 30, a stator 41, a rotor 42, a hollow shaft 50, a drive motor 60, an oil delivery pipe 70, an end cover 80, and a cooling device 90.

[0023] See also Figure 2 The hollow shaft 50 is sleeved outside the oil delivery pipe 70 with a gap and is fixed to the rotor 42 without relative rotation connection, that is, the oil delivery pipe 70 is located in the central hole of the hollow shaft 50 and a gap is maintained between the hollow shaft 50 and the oil delivery pipe 70, and the rotation of the hollow shaft 50 will not drive the rotation of the oil delivery pipe 70. The rotor 42 is sleeved outside the hollow shaft 50, the stator 41 is sleeved outside the rotor 42 and the stator 41 remains stationary relative to the motor housing 10, and the stator cooling jacket 30 is sleeved on the outer periphery of the stator 41.

[0024] The end cover 80 is connected to the motor housing 10 by bolts or screws, and the end cover 80 is opposite to the axial end faces of the rotor 42 and the stator 41. The end cover 80 is provided with a guide channel 81 whose opening is in the direction opposite to gravity, and the oil delivery pipe 70 is connected to the guide channel 81. The motor housing 10 is formed with a cooling water channel 13, and the guide channel 81 is connected to the cooling water channel 13. The fuel injection pump 20 is installed on the motor housing 10, and the fuel injection pump 20 includes an oil inlet end and an oil injection end (not shown), wherein the oil inlet end is connected to the cooling water channel 13 to extract the cooling oil in the cooling water channel 13, and the oil injection end faces the stator protective sleeve 30 to spray the cooling oil onto the stator protective sleeve 30. The stator cooling sleeve 30 located on both sides of the hollow shaft 50 in the gravity direction is respectively penetrated with an upper guide hole 31 and a lower oil leakage hole 32, and the upper guide hole 31 connects the oil injection end and the surface of the stator 41. The upper guide hole 31 can allow the cooling oil sprayed onto the stator protection cover 30 to flow to the stator 41 through the upper guide hole 31, and then the cooling oil is discharged from the lower oil leakage hole 32 below the stator protection cover 30 on the stator 41 by gravity. The end cover 80 is provided with an oil discharge hole 82 axially at a position away from the guide channel 81, i.e., close to the lower oil leakage hole 32, and the oil discharge hole 82 discharges the cooling oil from the motor housing 10.

[0025] In the above-mentioned motor cooling system 100, the oil delivery pipe 70 brings the cooling oil to the hollow shaft 50, and the hollow shaft 50 is interference-connected with the rotor 41. The cold oil delivery pipe 70 can take away a part of the heat of the rotor 41. The oil delivery pipe 70 is connected with the guide channel 81. During operation, under the action of the centrifugal force of the hollow shaft 50 and the rotor 42 and the oil pressure in the guide channel 81, the cooling oil enters the cooling water channel 13 through the guide channel 81 in the direction against gravity. The fuel injection pump 20 sprays the cooling oil in the cooling water channel 13 onto the stator protective cover 30, and the cooling oil will enter the upper guide hole 31 of the stator protective cover 30. Under the action of gravity, the cooling oil will flow to the surface of the stator 41 and flow out from the lower oil leakage hole 32, thereby cooling the stator 41. The cooling oil flowing out from the lower oil leakage hole 32 gathers at the bottom of the motor housing 10 and is then discharged through the oil discharge hole 82 on the end cover 80 for recycling. The motor cooling system realizes cooling of the rotor 42 and the stator 41 , has good cooling effect, and the cooling oil can be recycled. In addition, during the centrifugal process of the cooling oil in the guide channel 81 , part of the cooling oil will enter between the rotor 42 and the stator 41 , bringing a certain lubrication effect to the rotor 42 .

[0026] In one embodiment, the motor housing 10 includes a housing inner wall 12, a housing outer wall 11, and an end wall 14 connected between the housing inner wall and the housing outer wall, and the housing inner wall 12, the housing outer wall 11, and the housing end wall 14 define a cooling water channel 13. A connecting hole (not shown) is provided on the end wall 14 near one end of the guide channel 81, and the connecting hole enables the cooling water channel 13 to communicate with the guide channel 81.

[0027] An oil leakage channel 301 is defined between the housing inner wall 12 and the stator protection cover 30. The oil leakage channel 301 surrounds the outer periphery of the stator protection cover 30 and is spaced apart from the cooling water channel 13. The oil leakage channel 301 is connected to the upper guide hole 31, the lower oil leakage hole 32 and the oil drain hole 82. The oil leakage channel 301 is connected between the lower oil leakage hole 32 and the oil drain hole 82. The fuel injection pump 20 is mounted on the housing inner wall 12 and is located in the space of the oil leakage channel 301.

[0028] See also Figure 3 , Figure 3 The figure is a front view of the end cover 80 facing the axial end faces of the stator 41 and the rotor 42. The surface of the end cover 80 facing the axial end faces of the stator 41 and the rotor 42 is provided with an oil retaining groove 83 with an opening in the direction against gravity, wherein the direction against gravity is the vertically upward direction in the figure. The end cover 80 is assembled to the motor housing 10, and the oil retaining groove 83 and the axial end faces of the stator 41 and the rotor 42 jointly define a guide channel 81, and the cooling oil flows along the guide channel 81 under the action of centrifugal force. The specific oil retaining groove 83 includes a semicircular protrusion 831 and two ribs 832 connected to the semicircular protrusion 831, and the semicircular protrusion 831 contacts the two ribs 832 and the axial end faces of the stator 41 and the rotor 42 and jointly defines a guide channel 81 with an opening upward, which guides the cooling oil into the cooling water channel 13.

[0029] In one embodiment, the motor cooling system 100 is provided with a drive motor 60, which is connected to an oil pipe 70. The drive motor 60 can provide power to draw cooling oil from an external cooling device 90 into the oil pipe 70 and transport it to the end cover 80 through the oil pipe 70.

[0030] In one embodiment, the motor cooling system 100 further includes a bearing 510 and a bearing seat (not shown). Figure 2 The drawing of the middle bearing is a schematic drawing. The bearing 510 is sleeved at both ends of the hollow shaft 50, the bearing 510 is assembled on the bearing seat, the bearing seat is assembled on the motor housing 10, the bearing seat is a hollow bearing seat, the center of the bearing seat is hollow and connected to the oil pipeline 70, and the cooling oil can flow out from the hollow part of the bearing seat and enter the guide channel 81.

[0031] See also Figure 1 The cooling device 90 includes an oil outlet 91 and an oil return port 92. The oil outlet 91 is connected to the oil delivery pipe 70, and the oil return port 92 is connected to the oil drain hole 82. In this way, the cooling oil can flow out from the oil outlet 91 through the oil delivery pipe 70, the guide channel 81, the cooling water channel 13, the upper guide hole 31 on the stator protection sleeve 30, and the oil drain hole 82 on the end cover 80, and return to the oil return port 92 of the cooling device 90, and enter the cooling device 90 again. The cooling oil with heat can be used again after being cooled in the cooling device 90, thereby realizing the recycling of the cooling oil.

[0032] Furthermore, heat dissipation threads (not shown) are provided on the outer wall of the motor housing 10 , and the heat dissipation threads allow the motor housing 10 to further dissipate heat.

[0033] The present invention further provides a motor, which includes any one of the motor cooling systems 100 described above.

[0034] In addition, the present invention also protects an electric vehicle, on which any one of the above-mentioned motor cooling systems 100 is installed.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A motor cooling system, characterized in that: It includes a motor housing, a fuel injection pump, a stator cooling sleeve, a stator, a rotor, a hollow shaft, an oil delivery pipe and an end cover, wherein the hollow shaft is sleeved outside the oil delivery pipe, the rotor is sleeved outside the hollow shaft and is fixed to the hollow shaft and connected without rotational interference, the oil delivery pipe is located in the central hole of the hollow shaft and a gap is maintained between the hollow shaft and the oil delivery pipe, so that the rotation of the hollow shaft will not drive the rotation of the oil delivery pipe; the stator is sleeved outside the rotor and remains stationary relative to the motor housing, the stator cooling sleeve is sleeved on the outer periphery of the stator, the end cover is connected to the motor housing and is opposite to the axial end faces of the rotor and the stator; the end cover is provided with a guide channel with an opening in the direction opposite to gravity, and the oil delivery pipe is communicated with the guide channel; the motor housing is formed with a cooling water channel, and the guide channel is communicated with the cooling water channel; the fuel injection pump is installed on the motor housing, and the fuel injection pump includes an oil inlet end communicated with the cooling water channel and an oil injection end facing the stator cooling sleeve, The stator cooling sleeves located on both sides of the hollow shaft in the gravity direction are respectively provided with an upper guide hole and a lower oil leakage hole; the upper guide hole connects the oil injection end and the stator surface, and an oil discharge hole connected to the lower oil leakage hole is provided at one end of the end cover away from the guide channel; the motor cooling system brings cooling oil to the hollow shaft through an oil delivery pipe, the hollow shaft is interference-connected with the rotor, the cold oil delivery pipe takes away part of the heat of the rotor, the oil delivery pipe is connected with the guide channel, and when working, the cooling oil is discharged in the air Under the action of the centrifugal force of the spindle and the rotor and the oil pressure in the guide channel, the cooling oil enters the cooling water channel through the guide channel in the direction against gravity, and the oil injection pump sprays the cooling oil in the cooling water channel onto the stator cooling jacket, and the cooling oil will enter the upper guide hole of the stator cooling jacket. Under the action of gravity, the cooling oil will flow to the stator surface and out of the lower oil leakage hole, thereby cooling the stator. The cooling oil flowing out of the lower oil leakage hole gathers at the bottom of the motor housing and is then discharged through the oil drain hole on the end cover for recycling.

2. The motor cooling system according to claim 1, characterized in that: The motor housing includes an inner wall, an outer wall and an end wall connected between the inner wall and the outer wall of the housing at both axial ends. The inner wall, the outer wall and the end wall of the housing define the cooling water channel. The end wall near one end of the guide channel is provided with a connecting hole connecting the cooling water channel and the guide channel.

3. The motor cooling system according to claim 2, characterized in that: An oil leakage channel is defined between the inner wall of the housing and the stator cooling jacket. The oil leakage channel surrounds the outer circumference of the stator cooling jacket and is spaced apart from the cooling water channel. The oil leakage channel is communicated between the lower oil leakage hole and the oil drain hole.

4. The motor cooling system according to claim 1, characterized in that: An oil retaining groove with an opening in a direction counter to gravity is provided on the surface of the end cover facing the axial end faces of the stator and the rotor, and the oil retaining groove includes a semicircular annular protrusion and two ribs connected to the semicircular annular protrusion, and the semicircular protrusion and the two ribs are in contact with the axial end faces of the stator and the rotor and jointly define the guide channel.

5. The motor cooling system according to claim 1, characterized in that: The motor cooling system also includes a drive motor, which is connected to the oil pipeline and is used to supply cooling oil to the oil pipeline to provide power.

6. The motor cooling system according to claim 1, characterized in that: The motor cooling system also includes a bearing and a bearing seat. The bearing is sleeved at both ends of the hollow shaft, the bearing is assembled on the bearing seat, the bearing seat is assembled on the motor housing, and one end of the oil pipe close to the end cover is connected to the center of the bearing seat.

7. The motor cooling system according to claim 1, characterized in that: The motor cooling system further comprises a cooling device, wherein the cooling device comprises an oil outlet and an oil return port, wherein the oil outlet is connected to the oil delivery pipe, and the oil return port is connected to the oil drain hole.

8. The motor cooling system according to claim 1, characterized in that: The outer wall of the motor housing is also provided with heat dissipation threads.

9. A motor, characterized in that: The motor cooling system comprises the motor cooling system as described in any one of claims 1 to 8.

10. An electric vehicle, characterized in that: The motor cooling system comprises the motor cooling system as described in any one of claims 1 to 8.

Images