Cooling system of oil cooling driving motor

Abstract

The utility model relates to the technical field of vehicle motors, in particular to a cooling system of an oil-cooled driving motor, which is mainly characterized in that a plurality of axial oil passages of a shell extending along the axial direction are arranged on the inner circular surface of the shell; each oil injection ring is provided with an annular oil injection channel, an oil injection hole, a plurality of connecting oil channels and a butt joint oil channel, the connecting oil channels sequentially correspond to and are communicated with two adjacent shell axial oil channels, the butt joint oil channel is provided with an oil injection ring oil inlet communicated with the oil injection channel, and the connecting oil channels on the two oil injection rings are alternately distributed in the circumferential direction. The first shell axial oil duct to the penultimate shell axial oil duct which are sequentially arranged in the circumferential direction are sequentially connected in series in an S shape to form an S-shaped oil way, the penultimate shell axial oil duct to the last shell axial oil duct are communicated through the shell circumferential oil duct, and the two ends of the last shell axial oil duct are each communicated with a butt joint oil duct. And the first shell axial oil duct is communicated with a shell oil inlet formed in the shell. And the stator iron core and the stator winding end part radiating and cooling effects can be considered at the same time.

Description

Technical Field

[0001] This utility model relates to the field of automotive motor technology, and in particular to an oil-cooled drive motor cooling system. Background Technology

[0002] The drive motor is the power source of the core drive unit in an electric vehicle. A key indicator of whether a drive motor system meets design and operational requirements is whether the temperature rise of each component does not exceed the temperature rise limit during testing and actual operation. Temperature rise restricts the power density of the drive motor system, making effective thermal management crucial. Compared to water-cooled motor cooling systems, oil-cooled drive motor systems offer superior cooling performance because the cooling oil can directly contact the windings and other heat-generating components. This effectively increases the motor's power density and leads to its increasingly widespread application in electric drive systems.

[0003] With the increasing application of oil-cooled drive motors, how to enhance their cooling effect to further improve the power density of the motor has become an urgent problem to be solved. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is to provide an oil-cooled drive motor cooling system that can simultaneously take into account the heat dissipation and cooling effect of the stator core and the stator winding ends.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model provides an oil-cooled drive motor cooling system, including a housing and a stator assembly disposed within the housing. The stator assembly includes a stator core and a stator winding wound in the slots of the stator core. The outer circumferential surface of the stator core contacts the inner circumferential surface of the housing. The left and right ends of the stator winding are respectively located on the left and right ends of the stator core. Oil injection rings are respectively provided on the inner circumferential surface of the housing at the left and right ends corresponding to the left and right ends of the stator winding. Between the two oil injection rings are multiple axial oil channels extending axially and arranged sequentially and circumferentially. The oil injection rings are provided with annular oil injection channels, oil injection holes communicating with the oil injection channels, and multiple oil channels arranged sequentially and circumferentially. The system comprises multiple connecting oil passages and one docking oil passage. The docking oil passage is equipped with an injection ring inlet that communicates with the injection oil passage. The multiple connecting oil passages correspond to and connect with two adjacent housing axial oil passages in sequence. The multiple connecting oil passages on the two injection rings are alternately distributed in the circumferential direction, so that the first to the second to last housing axial oil passages arranged in the circumferential direction are connected in an S-shape to form an S-shaped oil circuit. The second to the last housing axial oil passages are connected to each other through a housing circumferential oil passage provided on the inner circular surface of the housing. The two ends of the last housing axial oil passage are respectively connected to a docking oil passage. The first housing axial oil passage is connected to the housing inlet provided on the housing.

[0007] Preferably, an oil return channel is provided on the outer circumference of the housing, and the cooling oil sprayed from the oil injection holes on the two oil injection rings sprays onto the left and right ends of the stator winding and then flows back into the oil return channel.

[0008] Preferably, it also includes an end cap, which is located at one end of the housing and has an oil return hole that is connected to the oil return channel.

[0009] Preferably, the oil injection ring is made of oil-compatible plastic, thermoplastic, or thermosetting material.

[0010] Preferably, the fuel injection ring is fixed to the inner circular surface of the housing by press fitting.

[0011] Preferably, it further includes a rotor assembly disposed inside the stator assembly. The rotor assembly includes a rotor shaft with a hollow inner hole, a rotor core sleeved on the rotor shaft and inside the stator core, and a balance plate sleeved on the rotor shaft and located at both ends of the rotor core. An annular oil passage is provided on the inner periphery of the side of the balance plate facing the rotor core. An oil outlet hole is provided on the rotor shaft at the location of the balance plate, which connects the inner hole and the annular oil passage. The balance plate is provided with multiple radial oil holes and multiple axial oil holes that communicate with the annular oil passage.

[0012] Preferably, the balance plate includes an aluminum substrate plate and an inlaid steel sleeve disposed in the inner ring of the aluminum substrate plate, and the annular oil channel, radial oil hole and axial oil hole are all disposed in the inlaid steel sleeve.

[0013] Preferably, the inlaid steel sleeve is embedded in the aluminum substrate plate.

[0014] Compared with the prior art, this utility model has significant progress:

[0015] This utility model discloses an oil-cooled drive motor cooling system. An axial S-shaped series oil circuit is formed by the outer circular surface of the stator core, the axial oil passage on the inner circular surface of the housing, and oil spray rings on both sides. This circuit cools the stator core. The end of the S-shaped series oil circuit connects to the oil spray passages on the left and right oil spray rings via a circumferential oil passage on the housing, the last axial oil passage, and connecting oil passages on the left and right oil spray rings. Oil is then sprayed from the spray holes on the left and right oil spray rings onto the left and right ends of the stator windings, achieving spray cooling of the stator winding ends. Therefore, it simultaneously cools both the stator core and the stator winding ends, effectively reducing the stator assembly's heating temperature, improving the uniformity of temperature distribution, enhancing the cooling effect, and thus increasing the motor's power density. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the oil-cooled drive motor cooling system according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the housing structure in the oil-cooled drive motor cooling system of this utility model embodiment.

[0018] Figure 3 This is a schematic diagram of the end cover structure in the oil-cooled drive motor cooling system of this utility model embodiment.

[0019] Figure 4 This is a schematic diagram of the left-side oil injection ring in the oil-cooled drive motor cooling system of this utility model embodiment.

[0020] Figure 5 This is a schematic diagram of the right-side oil injection ring in the oil-cooled drive motor cooling system of this utility model embodiment.

[0021] Figure 6 This is a half-sectional view of the right-side oil injection ring in the oil-cooled drive motor cooling system of this utility model embodiment.

[0022] Figure 7 This is a schematic diagram of the stator and rotor oil circuits of the oil-cooled drive motor cooling system according to an embodiment of this utility model.

[0023] Figure 8 This is a schematic diagram of the stator oil circuit of the oil-cooled drive motor cooling system according to an embodiment of this utility model.

[0024] Figure 9 This is a half-sectional schematic diagram of the rotor assembly in the oil-cooled drive motor cooling system of this utility model embodiment.

[0025] Figure 10 This is a half-sectional schematic diagram of the balance plate in the oil-cooled drive motor cooling system of this utility model embodiment.

[0026] Figure 11 This is a schematic diagram of the rotor oil circuit of the oil-cooled drive motor cooling system according to an embodiment of the present invention.

[0027] The reference numerals in the attached figures are explained as follows:

[0028] 1. Shell

[0029] 11. Axial oil passages in the casing

[0030] 12. Circumferential oil passages in the casing

[0031] 13. Oil inlet of the casing

[0032] 14 Return oil channel

[0033] 2. Stator Assembly

[0034] 3, 3a, 3b Injection rings

[0035] 31, 31a, 31b fuel injection channels

[0036] 32, 32a, 32b fuel injection holes

[0037] 33, 33a, 33b connect oil passages

[0038] 34, 34a, 34b are connected to the oil passages.

[0039] 35, 35a, 35b fuel injection ring inlet

[0040] 4 End Caps

[0041] 41 Oil return hole

[0042] 5 Rotor Assembly

[0043] 51 Rotor Shaft

[0044] 510 inner hole

[0045] 511 Oil outlet hole

[0046] 52 Rotor core

[0047] 53 Balance Board

[0048] 531 aluminum base plate

[0049] 532 Inlaid steel sleeve

[0050] 54 Annular oil passage

[0051] 55 Radial oil hole

[0052] 56 Axial oil hole

[0053] 6 bearings Detailed Implementation

[0054] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0055] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0058] like Figures 1 to 11 The image shows an embodiment of the oil-cooled drive motor cooling system provided by this utility model.

[0059] See Figure 1 The oil-cooled drive motor cooling system of this embodiment includes a housing 1 and a stator assembly 2 disposed in the housing 1. The stator assembly 2 includes a stator core and a stator winding wound in the slots of the stator core. The outer circular surface of the stator core is in contact with the inner circular surface of the housing 1. The left and right ends of the stator winding are located on the left and right ends of the stator core, respectively. On the inner circular surface of the housing 1, oil spray rings 3 are respectively provided at the left and right ends corresponding to the left and right ends of the stator winding, namely the left oil spray ring 3a and the right oil spray ring 3b.

[0060] The oil-cooled drive motor cooling system of this embodiment also includes an end cover 4, which is located at one end of the housing 1. The end cover 4 is connected to the housing 1 to form a motor housing assembly.

[0061] The oil-cooled drive motor cooling system of this embodiment also includes a rotor assembly 5 located inside the stator assembly 2. The rotor assembly 5 includes a rotor shaft 51, a rotor core 52 sleeved on the rotor shaft 51 and inside the stator core, and a balance plate 53 sleeved on the rotor shaft 51 and located at both ends of the rotor core 52. The left and right ends of the rotor shaft 51 are rotatably supported on the end cover 4 and the housing 1 by bearings 6, respectively.

[0062] See Figure 2The inner circular surface of the housing 1 is provided with multiple housing axial oil passages 11 and one housing circumferential oil passage 12. The multiple housing axial oil passages 11 are located between two oil injection rings 3 on the inner circular surface of the housing 1. The multiple housing axial oil passages 11 extend along the axial direction of the housing 1. The multiple housing axial oil passages 11 are arranged sequentially from the first housing axial oil passage 11 to the last housing axial oil passage 11 along the circumference of the housing 1. The housing circumferential oil passage 12 is provided between the second to last housing axial oil passage 11 and the last housing axial oil passage 11. The housing circumferential oil passage 12 extends along the circumference of the housing 1. The second to last housing axial oil passages 11 are connected by the housing circumferential oil passage 12. The first housing axial oil passage 11 is connected to the housing oil inlet 13 provided on the housing 1. In addition, the outer circular surface of the housing 1 is provided with an oil return channel 14.

[0063] See Figure 3 The end cap 4 is provided with an oil return hole 41, which is connected to the oil return channel 14 on the housing 1.

[0064] See Figures 4 to 8 The injection ring 3 is provided with an annular injection channel 31, an injection hole 32 connected to the injection channel 31, a plurality of connecting channels 33 arranged sequentially along the circumference, and a docking channel 34. The docking channel 34 is provided with an injection ring inlet 35 connected to the injection channel 31. The plurality of connecting channels 33 on each injection ring 3 correspond to and connect to two adjacent housing axial channels 11 in sequence. The plurality of connecting channels 33 on the two injection rings 3 are alternately distributed in the circumference, so that the first to the second to last housing axial channels 11 arranged in the circumference are connected in an S-shape to form an S-shaped oil circuit. The two ends of the last housing axial channel 11 are respectively connected to a docking channel 34.

[0065] Specifically, see Figure 4 The inner circular surface of the left injection ring 3a, near the center of the housing 1, has multiple left-side connecting oil passages 33a and a left-side docking oil passage 34a arranged circumferentially at intervals. The multiple left-side connecting oil passages 33a correspond to and connect to the left ends of two adjacent housing axial oil passages 11 at the left end of the housing 1. The left-side docking oil passage 34a connects to the left end of the last housing axial oil passage 11. The left injection ring 3a also has a left-side injection oil passage 31a. The left-side docking oil passage 34a has a left-side injection ring inlet 35a, which connects to the left-side injection oil passage 31a. The left-side injection oil passage 31a has multiple left-side injection holes 32a.

[0066] See Figure 5 and Figure 6The outer circumference of the right-side fuel injection ring 3b, near the center of the housing 1, is provided with multiple right-side connecting oil passages 33b and a right-side docking oil passage 34b arranged circumferentially at intervals. The multiple right-side connecting oil passages 33b correspond to and connect to the right ends of two adjacent housing axial oil passages 11 at the right end of the housing 1. The right-side docking oil passage 34b is connected to the right end of the last housing axial oil passage 11. The right-side fuel injection ring 3b is also provided with a right-side fuel injection passage 31b. The right-side docking oil passage 34b is provided with a right-side fuel injection ring inlet 35b, which is connected to the right-side fuel injection passage 31b. The right-side fuel injection passage 31b is provided with multiple right-side fuel injection holes 32b.

[0067] Therefore, see Figure 7 and Figure 8 The stator oil circuit, formed by the outer surface of the stator core, the inner surface of the housing 1, the left oil injection ring 3a, and the right oil injection ring 3b, is as follows: Cooling oil enters the first housing axial oil passage 11 from the housing oil inlet 13 on the housing 1, and then flows sequentially through the first right-side connecting oil passage 33b of the right oil injection ring 3b, the second housing axial oil passage 11, the first left-side connecting oil passage 33a of the left oil injection ring 3a, the third housing axial oil passage 11, the second right-side connecting oil passage 33b of the right oil injection ring 3b, ..., until the penultimate housing axial oil passage 11, thus forming an S-shaped oil circuit; flowing into the penultimate... Cooling oil in the axial oil passages 11 of the housing flows into the last axial oil passage 11 of the housing through the circumferential oil passages 12 of the housing, and flows from the left and right ends of the last axial oil passage 11 into the left docking oil passage 34a and the right docking oil passage 34b, respectively. Cooling oil flowing into the left docking oil passage 34a enters the right injection oil passage 31b from the left oil injection ring inlet 35a, and is sprayed onto the left end of the stator winding from the right oil injection hole 32b. Cooling oil flowing into the right docking oil passage 34b enters the right injection oil passage 31b from the right oil injection ring inlet 35b, and is sprayed onto the right end of the stator winding from the right oil injection hole 32b. Cooling oil sprayed from the injection holes 32 on the two oil injection rings 3 sprays onto the left and right ends of the stator winding and then flows back into the return oil passage 14 on the housing 1.

[0068] The oil-cooled drive motor cooling system of this embodiment consists of an axial S-shaped series oil circuit formed by the outer circular surface of the stator core, the axial oil passage 11 on the inner circular surface of the housing 1, and the oil spray rings 3 on both sides. This circuit can cool and dissipate heat from the stator core. The end of the S-shaped series oil circuit is connected to the oil spray passages 31 on the left and right sides of the oil spray rings 3 through a circumferential oil passage 12, the last axial oil passage 11, and the connecting oil passages 34 on the left and right sides of the oil spray rings 3. Oil can then be sprayed from the spray holes 32 on the left and right sides of the oil spray rings 3 onto the left and right ends of the stator winding, achieving spray cooling and heat dissipation at the ends of the stator winding. Therefore, it can simultaneously address the heat dissipation and cooling of both the stator core and the ends of the stator winding, effectively reducing the heating temperature of the stator assembly 2, improving the uniformity of the temperature distribution of the stator assembly 2, enhancing the cooling effect, and thus increasing the power density of the motor.

[0069] In this embodiment, preferably, the oil injection ring 3 is made of oil-compatible plastic, thermoplastic, or thermosetting material. The oil injection ring 3 is preferably fixed to the inner circular surface of the housing 1 by press fitting.

[0070] See Figure 9 and Figure 10 In this embodiment, preferably, in the rotor assembly 5, the rotor shaft 51 has a hollow interior forming an inner hole 510. Both balance plates 53 have annular oil channels 54 on their inner periphery facing the rotor core 52. The rotor shaft 51 has an oil outlet 511 at the location of the balance plate 53, connecting the inner hole 510 and the annular oil channel 54. The balance plate 53 has multiple radial oil holes 55 and multiple axial oil holes 56 connected to the annular oil channel 54. Preferably, the balance plate 53 includes an aluminum substrate 531 and an inlaid steel sleeve 532 located within the inner ring of the aluminum substrate 531. The annular oil channel 54, radial oil holes 55, and axial oil holes 56 are all located within the inlaid steel sleeve 532. The inlaid steel sleeve 532 is preferably embedded within the aluminum substrate 531 and can be formed by casting.

[0071] Therefore, see Figure 11 The rotor oil circuit, consisting of rotor shaft 51 and two balance plates 53, is as follows: Cooling oil enters the inner hole 510 of rotor shaft 51, passes through the oil outlet 511 at the location of the two balance plates 53, and enters the annular oil passage 54 on the embedded steel sleeve 532 of the two balance plates 53. It is then ejected through multiple radial oil holes 55 and multiple axial oil holes 56 on the annular oil passage 54, achieving cooling and heat dissipation on the inner side of the stator winding. It can also be ejected through the axial oil holes 56 to the bearings 6 at both ends of rotor shaft 51 for cooling and heat dissipation. The rotor oil ejection is achieved through the cooperation of rotor shaft 51 and the embedded steel sleeve 532 of balance plates 53, which simultaneously takes into account the heat dissipation of rotor core 52, magnets, and bearings 6, effectively reducing the temperature of the magnets and ensuring the lubrication of the bearings 6.

[0072] The oil-cooled drive motor cooling system of this embodiment uses an axial S-shaped series oil circuit to achieve stator core cooling and heat dissipation and stator winding end spray cooling. At the same time, it also uses rotor oil circuit to throw oil, which can significantly reduce the motor temperature under load conditions and greatly improve the power density of the motor.

[0073] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A cooling system for an oil-cooled drive motor, characterized in that, The device includes a housing and a stator assembly disposed within the housing. The stator assembly includes a stator core and a stator winding wound in the slots of the stator core. The outer circumferential surface of the stator core contacts the inner circumferential surface of the housing. The left and right ends of the stator winding are respectively located on the left and right ends of the stator core. On the inner circumferential surface of the housing, oil injection rings are respectively provided at the left and right ends corresponding to the left and right ends of the stator winding. Between two oil injection rings, a plurality of housing axial oil channels extending axially and arranged sequentially and spaced apart circumferentially are provided. Each oil injection ring has an annular oil injection channel, an oil injection hole communicating with the oil injection channel, a plurality of connecting oil channels arranged sequentially and spaced apart circumferentially, and a... The connecting oil passage is provided with an injection ring inlet that communicates with the injection oil passage. Multiple connecting oil passages are sequentially corresponding to and connected to two adjacent housing axial oil passages. The multiple connecting oil passages on the two injection rings are alternately distributed in the circumferential direction, so that the first to the second to last housing axial oil passages arranged in the circumferential direction are sequentially connected in an S-shape to form an S-shaped oil path. The second to the last housing axial oil passages are connected to each other through a housing circumferential oil passage provided on the inner circular surface of the housing. The two ends of the last housing axial oil passage are respectively connected to a connecting oil passage. The first housing axial oil passage is connected to the housing inlet provided on the housing.

2. The oil-cooled drive motor cooling system according to claim 1, characterized in that, The outer circumference of the housing is provided with an oil return channel. The cooling oil sprayed from the oil injection holes on the two oil injection rings sprays onto the left and right ends of the stator winding and then flows back into the oil return channel.

3. The oil-cooled drive motor cooling system according to claim 2, characterized in that, It also includes an end cap, which is located at one end of the housing and has an oil return hole that is connected to the oil return channel.

4. The oil-cooled drive motor cooling system according to claim 1, characterized in that, The oil injection ring is made of oil-compatible plastic, thermoplastic, or thermosetting materials.

5. The oil-cooled drive motor cooling system according to claim 4, characterized in that, The oil injection ring is fixed to the inner circular surface of the housing by press fitting.

6. The oil-cooled drive motor cooling system according to claim 1, characterized in that, It also includes a rotor assembly disposed inside the stator assembly. The rotor assembly includes a rotor shaft with a hollow inner hole, a rotor core sleeved on the rotor shaft and inside the stator core, and a balance plate sleeved on the rotor shaft and located at both ends of the rotor core. The inner periphery of the balance plate facing the rotor core is provided with an annular oil passage. The rotor shaft is provided with an oil outlet hole at the location of the balance plate that connects the inner hole and the annular oil passage. The balance plate is provided with a plurality of radial oil holes and a plurality of axial oil holes that communicate with the annular oil passage.

7. The oil-cooled drive motor cooling system according to claim 6, characterized in that, The balance plate includes an aluminum substrate plate and an embedded steel sleeve located in the inner ring of the aluminum substrate plate. The annular oil channel, the radial oil hole and the axial oil hole are all located in the embedded steel sleeve.

8. The oil-cooled drive motor cooling system according to claim 7, characterized in that, The inlaid steel sleeve is embedded in the aluminum substrate plate.

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