Oil-cooled motor, power assembly and electric vehicle

Abstract

This application provides an oil-cooled motor, a powertrain, and an electric vehicle. The housing of the oil-cooled motor is used to house and fix the stator of the oil-cooled motor. The stator includes a first iron core and a second iron core arranged adjacent to each other along the axial direction of the oil-cooled motor. The interval between two adjacent second grooves in the second iron core is equal to the interval between two first grooves located on both sides of the three adjacent first grooves in the first iron core. The middle first groove of the three first grooves is used to embed a limiting member, which is used to limit the displacement between the first iron core and the housing. A third groove on the inner wall of the housing is used to connect the liquid inlet channel of the housing to receive coolant. The iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle first groove of the three first grooves, so that the coolant will not leak from the middle first groove of the three first grooves, allowing the coolant to be used entirely for cooling the stator, which is beneficial to improving the cooling effect of the stator.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to an oil-cooled motor, powertrain, and electric vehicle. Background Technology

[0002] With the development of electric vehicles, the demand for high-speed, high-density, lightweight, and miniaturized motors in their powertrains is increasing, bringing significant challenges to heat dissipation. Overheating of the motor can lead to insulation failure and demagnetization of the permanent magnets embedded in the rotor, resulting in the powertrain malfunctioning and affecting driving safety. Therefore, it is necessary to address the stator heat dissipation problem by circulating oil through the motor. However, to limit the circumferential displacement between the stator and the housing, a limiting component needs to be inserted on the outer surface of the stator to engage with the housing. Due to structural, manufacturing, and assembly tolerances, when oil is circulated through the outer surface of the stator core, the oil leaks from the gap between the limiting component and the housing / stator core, reducing the amount of oil delivered to other parts of the stator for cooling. This results in less oil effectively participating in stator cooling, leading to poor motor heat dissipation. Utility Model Content

[0003] This application provides an oil-cooled motor, powertrain, and electric vehicle to prevent coolant in the third groove of the housing from leaking from the gap between the limiting member and the stator and the housing, thereby improving the cooling efficiency of the stator.

[0004] In a first aspect, this application provides an oil-cooled motor. The housing of the oil-cooled motor is used to accommodate and fix the stator of the oil-cooled motor. The stator includes a first iron core and a second iron core, which are arranged adjacent to each other along the axial direction of the oil-cooled motor. The outer circumferential surface of the first iron core includes three first grooves, which are arranged adjacent to each other along the circumferential direction of the stator. Each first groove connects to the end face of the first iron core facing the second iron core. The middle first groove is used to embed a limiting member to restrict the displacement between the first iron core and the housing. The outer circumferential surface of the second iron core includes two second grooves, which are arranged adjacent to each other along the circumferential direction of the stator. Each second groove connects to the end face of the second iron core facing the first iron core. The distance between the two second grooves along the circumferential direction of the stator is equal to the distance between the two outermost first grooves. The inner wall of the housing includes a third groove, which connects to the liquid inlet channel of the housing to receive coolant. The size of the third groove along the circumferential direction of the stator is larger than the distance between the two second grooves. The iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle first groove.

[0005] In this embodiment, three first grooves are arranged adjacent to each other along the circumference of the stator. Each first groove is connected to the end face of the first iron core facing the second iron core. The first groove in the middle of the three first grooves is used to embed a limiting member. The limiting member is used to limit the displacement between the first iron core and the shell, so that the first groove of the first iron core, which was originally used to receive coolant, can be used to accommodate the limiting member directly without the need to open an additional receiving groove for the limiting member, making the structure simpler.

[0006] In this embodiment, each second groove connects to the end face of the second iron core facing the first iron core. The interval between two second grooves along the circumference of the stator is equal to the interval between the two first grooves located on both sides of the three first grooves. This allows the iron core portion between the two second grooves to block the first groove located in the middle of the three first grooves, thereby preventing the coolant in the third groove from flowing into the first groove located in the middle of the three first grooves and preventing the coolant from leaking from the gap between the limiting member and the first groove located in the middle of the three first grooves. This allows more coolant to cool the stator and improve the cooling effect of the stator.

[0007] In this embodiment, the inner wall of the housing includes a third groove for connecting to the liquid inlet channel of the housing to receive coolant. The size of the third groove along the circumference of the stator is larger than the interval between the two second grooves, so that the iron core portion between the two second grooves will not completely block the third groove. This allows the coolant input through the liquid inlet channel of the housing to flow into the two second grooves along the circumference of the stator. The interval between the two second grooves along the circumference of the stator is equal to the interval between the two first grooves located on both sides of the three first grooves. Each first groove connects to the end face of the first iron core facing the second iron core, and each second groove connects to the end face of the second iron core facing the first iron core. This allows the coolant in the two second grooves to be input along the axial direction of the oil-cooled motor into the two first grooves located on both sides of the three first grooves to cool and reduce the temperature of the first iron core.

[0008] In this embodiment, the iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle first groove of the three first grooves. The middle first groove of the three first grooves is used to embed a limiting member, thereby preventing the coolant in the third groove from flowing into the gap between the middle first groove of the three first grooves and the limiting member and causing leakage. This allows more coolant to be used to cool the stator, which is beneficial to improving the cooling effect of the stator.

[0009] In this embodiment, along the circumference of the stator, the interval length between two adjacent second grooves of the second iron core is equal to the interval length between two first grooves located on both sides of the three adjacent first grooves of the first iron core. This allows the iron core portion between the two second grooves in the second iron core to seal the middle first groove among the three first grooves in the first iron core that accommodate the limiting member. The iron core portion between the two second grooves, in conjunction with the inner wall of the housing, prevents coolant from flowing from the third groove into the middle first groove among the three first grooves used to embed the limiting member. This prevents coolant from leaking from the gap between the limiting member and the middle first groove among the three first grooves, allowing more coolant to be used to cool the stator, which is beneficial for improving the cooling effect of the stator.

[0010] In one embodiment, the third groove is disposed around the inner wall of the housing along the circumference of the stator, so that the outer peripheral surface of the second iron core can be cooled by the coolant from the liquid inlet channel of the housing. Furthermore, the coolant can flow from the outer peripheral surface of the second iron core along the axial direction of the oil-cooled motor to the outer peripheral surface of the first iron core, thereby cooling the first iron core.

[0011] In one embodiment, along the circumference of the stator, the length of the core portion between the two second grooves is greater than the width of the middle first groove among the three first grooves.

[0012] In this embodiment, along the circumference of the stator, the length of the core portion between the two second grooves is greater than the groove width of the middle first groove among the three first grooves. The larger length of the core portion between the two second grooves allows the core portion between the two second grooves to better seal the middle first groove among the three first grooves that accommodate the limiting member along the circumference of the stator, preventing coolant from flowing from the third groove into the middle first groove among the three first grooves. This prevents coolant from leaking from the gap between the limiting member and the middle first groove among the three first grooves, allowing more coolant to cool the stator and improving the cooling effect of the coolant on the stator.

[0013] In one embodiment, along the radial direction of the stator, the length of the core portion between the two second grooves is greater than the groove depth of the middle first groove among the three first grooves.

[0014] In this embodiment, along the radial direction of the stator, the length of the core portion between the two second grooves is greater than the groove depth of the middle first groove among the three first grooves. The larger length of the core portion between the two second grooves allows it to seal the middle first groove among the three first grooves containing the limiting member along the radial direction of the stator. It also allows the core portion between the two second grooves to better seal the middle first groove among the three first grooves, preventing coolant from flowing from the third groove into the middle first groove among the three first grooves. This prevents coolant from leaking from the gap between the limiting member and the middle first groove among the three first grooves, allowing more coolant to cool the stator and improving the cooling effect of the coolant on the stator.

[0015] In one embodiment, one of the two second grooves connects to one of the two first grooves located on either side of the three first grooves, and the other of the two second grooves connects to the other of the two first grooves located on either side of the three first grooves. Along the circumferential direction of the stator, at least one of the two first grooves located on either side and the other has a groove width greater than the groove width of the first groove located in the middle of the three first grooves.

[0016] In this embodiment, one of the two second grooves connects to one of the two first grooves located on either side of the three first grooves, allowing one of the two second grooves to supply coolant to one of the two first grooves located on either side of the three first grooves. The other of the two second grooves connects to the other of the two first grooves located on either side of the three first grooves, allowing the other of the two second grooves to supply coolant to the other of the two first grooves located on either side of the three first grooves. This allows the coolant to flow along the axial direction of the oil-cooled motor from the second core to the first core on the outer surface of the stator, dissipating heat from the stator.

[0017] In this embodiment, the middle groove of the three first grooves used to accommodate the limiting member is blocked, preventing coolant from flowing through it and affecting the heat dissipation of the first core. Along the circumference of the stator, the width of at least one of the two side grooves is greater than the width of the middle groove. This larger width allows the two side grooves to receive more coolant and increases the heat dissipation area between the coolant and the side grooves, indirectly enhancing the heat dissipation of the stator near the middle groove. This ensures effective cooling of the stator while preventing coolant leakage from the gap between the middle groove and the limiting member.

[0018] In one embodiment, one of the two second grooves connects to one of the two first grooves located on either side of the three first grooves, and the other of the two second grooves connects to the other of the two first grooves located on either side of the three first grooves. Specifically, along the radial direction of the stator, at least one of the two first grooves located on either side and the other has a groove depth greater than the groove depth of the first groove located in the middle of the three first grooves.

[0019] In this embodiment, one of the two second grooves connects to one of the two first grooves located on either side of the three first grooves, allowing one of the two second grooves to supply coolant to one of the two first grooves located on either side of the three first grooves. The other of the two second grooves connects to the other of the two first grooves located on either side of the three first grooves, allowing the other of the two second grooves to supply coolant to the other of the two first grooves located on either side of the three first grooves. This allows the coolant to flow axially from the second core to the first core of the oil-cooled motor, dissipating heat from the stator.

[0020] In this embodiment, the middle first groove of the three first grooves used to accommodate the limiting member is blocked by the iron core portion between the two second grooves, preventing coolant from flowing through the middle first groove and affecting the heat dissipation effect of the first iron core. Along the radial direction of the stator, the groove depth of at least one of the two side first grooves is greater than the groove depth of the middle first groove. This larger groove depth allows the two side first grooves to receive more coolant and increases the heat dissipation area between the coolant and the side first grooves, indirectly enhancing the heat dissipation effect of the portion of the first iron core near the middle first groove. This ensures the stator's cooling effect while preventing coolant leakage from the gap between the middle first groove and the limiting member.

[0021] In one embodiment, one of the two second grooves connects to one of the two first grooves located on either side of the three first grooves. One of the two first grooves located on either side of the three first grooves includes at least two first sub-grooves, which are arranged adjacently along the circumference of the stator. The distance between two adjacent first sub-grooves along the circumference of the stator is less than the distance between the middle first groove and one of the two first grooves located on either side of the three first grooves, and the width of each first sub-grooves is less than the width of the middle first groove among the three first grooves.

[0022] In this embodiment of the application, one of the two second grooves is connected to one of the two first grooves located on both sides of the three first grooves. One of the two first grooves located on both sides of the three first grooves includes at least two first sub-grooves, such that one of the two second grooves can deliver coolant to at least two first sub-grooves.

[0023] In this embodiment, along the circumferential direction of the stator, the distance between two adjacent first sub-grooves is less than the distance between the middle first groove and one of the two side first grooves among the three first grooves. The groove width of each first sub-grooves is less than the groove width of the middle first groove among the three first grooves. This makes at least two first sub-grooves arranged compactly. Without widening the groove width of one of the two side first grooves among the three first grooves, the heat dissipation area of ​​the coolant and one of the two side first grooves among the three first grooves can be increased, thereby improving the cooling effect of the first core and thus improving the cooling effect of the stator.

[0024] In one embodiment, one of the two second grooves connects to one of the two first grooves located on both sides of the three first grooves. Along the circumferential direction of the stator, the width of one of the two second grooves is greater than the width of one of the two first grooves located on both sides of the three first grooves.

[0025] In this embodiment of the application, one of the two second grooves is connected to one of the two first grooves located on both sides of the three first grooves, so that one of the two second grooves can deliver coolant to one of the two first grooves located on both sides of the three first grooves.

[0026] In this embodiment, along the circumferential direction of the stator, the width of one of the two second grooves is greater than the width of one of the two first grooves located on either side of the three first grooves. The larger width of one of the two second grooves allows it to receive more coolant from the third groove and also allows it to deliver more coolant to one of the two first grooves located on either side of the three first grooves. The smaller width of one of the two first grooves located on either side of the three first grooves allows the coolant to flow at a faster speed when it delivers more coolant, thus accelerating the cooling efficiency of the first core and enhancing the stator's cooling effect.

[0027] In one embodiment, one of the two second grooves connects to one of the two first grooves located on both sides of the three first grooves, and the outer peripheral surface of the second core includes another second groove, which is arranged adjacent to one of the two second grooves along the circumferential direction of the stator. The other second groove connects to one of the two first grooves located on both sides of the three first grooves.

[0028] In this embodiment of the application, one of the two second grooves is connected to one of the two first grooves located on both sides of the three first grooves, so that one of the two second grooves can deliver coolant to one of the two first grooves located on both sides of the three first grooves.

[0029] In this embodiment, the middle first groove of the three first grooves used to accommodate the limiting member is blocked by the iron core portion between the two second grooves, so that the coolant does not flow through the middle first groove of the three first grooves, and the heat dissipation effect of the first iron core is affected. The other second groove is arranged adjacent to one of the two second grooves along the circumference of the stator, so that the other second groove connects to one of the two first grooves on both sides of the three first grooves. This allows one of the two second grooves and the other second groove adjacent to it to deliver coolant to one of the two first grooves on both sides of the three first grooves, so that one of the two first grooves on both sides of the three first grooves can receive more coolant, which is beneficial to improving the cooling efficiency of the coolant on the first iron core, thereby enhancing the cooling effect of the stator.

[0030] In one embodiment, along the radial direction of the stator, the core portion between the two second grooves is arranged opposite to the third groove. The core portion between the two second grooves is used to embed into a portion of the third groove to prevent coolant from flowing from the third groove into the middle of the three first grooves. A portion of the third groove is arranged adjacent to the limiting member along the axial direction of the stator.

[0031] In this embodiment of the application, along the radial direction of the stator, the core portion between the two second grooves is arranged opposite to the third groove, such that the core portion between the two second grooves can be embedded in a portion of the third groove, thereby isolating the third groove from the first groove located in the middle of the three first grooves.

[0032] In this embodiment, the core portion between the two second grooves is embedded in a portion of the third groove to prevent coolant from flowing from the third groove into the middle first groove among the three first grooves. This allows the core portion between the two second grooves to be interference-fitted with the groove wall of the middle third groove. The middle third groove and the limiting member are arranged adjacent to each other along the axial direction of the stator to prevent coolant in the third groove from flowing into the middle first groove among the three first grooves that accommodate the limiting member. This prevents coolant from leaking from the gap between the middle first groove and the limiting member, allowing more coolant to be used to cool the stator and improve the cooling effect of the stator.

[0033] In one embodiment, the core portion between the two second grooves serves to cooperate with a portion of the inner wall of the housing between the third groove and the middle first groove of the three first grooves to prevent coolant from flowing from the third groove into the middle first groove of the three first grooves.

[0034] In this embodiment, the iron core portion between the two second grooves is used to cooperate with a portion of the inner wall of the housing between the third groove and the middle first groove among the three first grooves to prevent coolant from flowing from the third groove into the middle first groove among the three first grooves. This allows the iron core portion between the two second grooves to abut against and press against a portion of the inner wall of the housing along the radial direction of the stator. As a result, the third groove and the middle first groove among the three first grooves are isolated by the iron core portion between the two second grooves, thereby preventing coolant in the third groove from flowing into the middle first groove among the three first grooves. This also prevents coolant from leaking from the gap between the middle first groove and the limiting member, allowing more coolant to be used to cool the stator and improve the cooling effect of the stator.

[0035] In one embodiment, along the radial direction of the stator, the depth of a portion of the third groove into which the core portion between the two second grooves is embedded is less than the depth of another portion of the third groove, excluding the portion of the third groove. Along the axial direction of the stator, the width of the portion of the third groove is greater than the axial width of the core portion between the two second grooves.

[0036] In this embodiment, the core portion between the two second grooves is embedded in a portion of the third groove. The depth of the portion of the third groove into which the core portion between the two second grooves is embedded is less than the depth of the other portion of the third grooves. The smaller depth of the portion of the third groove allows less coolant to flow through the gap between the core portion between the two second grooves and the portion of the third groove. It can even allow the core portion between the two second grooves to abut against the bottom of the portion of the third groove, preventing coolant from flowing through the gap between the core portion between the two second grooves and the portion of the third groove. This is more conducive to better sealing of the middle first groove among the three first grooves containing the limiting member by the core portion between the two second grooves, preventing coolant from flowing from the third groove into the middle first groove among the three first grooves, and thus preventing coolant leakage from the gap between the middle first groove and the limiting member. This allows more coolant to be used for cooling the stator, which is beneficial to improving the cooling effect of the stator. The third groove, except for one part, has a deeper groove, which allows the third groove to have a larger volume to accommodate the coolant entering through the liquid inlet channel of the housing, thereby improving the cooling effect of the stator.

[0037] In this embodiment of the application, along the axial direction of the stator, the width of a portion of the third groove is greater than the axial width of the iron core portion between the two second grooves. The width of the portion of the third groove with a smaller groove depth is widened to allow the coolant to flow around the iron core portion between the two second grooves in the circumferential direction of the stator, thus ensuring the flow of the coolant in the third groove and thereby ensuring the cooling effect of the coolant on the stator.

[0038] In one embodiment, a portion of the third groove near the groove wall of the limiting member includes a protrusion. This protrusion protrudes radially towards the stator and is radially opposite to the middle of the three first grooves. The protrusion serves to engage with the core portion between the two second grooves to prevent coolant from flowing from the third groove into the middle of the three first grooves. Circumferentially, the length of the protrusion is less than the groove width of the middle of the three first grooves. Radially, the length of the protrusion is less than the groove depth of the middle of the three first grooves.

[0039] In this embodiment, the core portion between the two second grooves is used to block the first groove located in the middle of the three first grooves. A portion of the third groove near the groove wall of the limiting member includes a protrusion. The protrusion along the radial direction of the stator faces the stator protrusion. The protrusion is opposite to the first groove located in the middle of the three first grooves along the radial direction of the stator. This makes it easier for the core portion between the two second grooves to cooperate with the protrusion of the third groove to prevent coolant from flowing from the third groove into the first groove located in the middle of the three first grooves.

[0040] In this embodiment, the protrusion is radially opposite to the middle of the three first grooves, so that the protrusion can play a positioning role during the assembly of the stator and the housing.

[0041] In this embodiment, along the circumference of the stator, the length of the protrusion is less than the width of the middle first groove among the three first grooves. The length of the protrusion along the circumference of the stator is small, so that during the process of assembling the stator into the housing, a portion of the protrusion of the third groove can pass through the middle first groove among the three first grooves, and the protrusion will not hinder the assembly process of the stator.

[0042] In this embodiment of the application, along the radial direction of the stator, the length of the protrusion is less than the groove depth of the middle first groove among the three first grooves. The length of the protrusion along the radial direction of the stator is small, so that during the process of assembling the stator into the housing, it is only necessary to align the middle first groove among the three first grooves with the protrusion along the axial direction of the stator. The protrusion can pass through the middle first groove among the three first grooves, so that the protrusion will not affect the assembly of the stator.

[0043] In one embodiment, the stator further includes a third core. The third core, the second core, and the first core are arranged adjacent to each other along the axial direction of the oil-cooled motor. The outer circumferential surface of the third core includes three fourth grooves, which are arranged adjacent to each other along the circumferential direction of the stator. Each fourth groove connects to the end face of the third core facing the second core. The middle fourth groove is used to embed another limiting member, which limits the displacement between the third core and the housing. Each second groove connects to the end face of the second core facing the third core. The circumferential distance between two second grooves is equal to the distance between the two fourth grooves on either side of the three fourth grooves. The core portion between two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle fourth groove.

[0044] In this embodiment, the outer peripheral surface of the third iron core includes three fourth grooves. The three fourth grooves are arranged adjacent to each other along the circumference of the stator. Each fourth groove is connected to the end face of the third iron core facing the second iron core. The fourth groove in the middle of the three fourth grooves is used to embed another limiting member, so that the first iron core and the third iron core are respectively embedded in the limiting member and the other limiting member, so that the stator and the housing are circumferentially limited by the two limiting members, thereby making the circumferential limitation between the housing and the stator more reliable.

[0045] In this embodiment, the interval between the two second grooves along the circumference of the stator is equal to the interval between the two fourth grooves located on both sides of the three fourth grooves. The iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the fourth groove located in the middle of the three fourth grooves, and to prevent coolant in the third groove from flowing to the fourth groove located in the middle of the three fourth grooves. This prevents coolant from leaking from the gap between another limiting member and the fourth groove located in the middle of the three fourth grooves, thereby allowing more coolant to cool the stator and improve the cooling effect of the stator.

[0046] In this embodiment, the iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle fourth groove among the three fourth grooves. The iron core portion between the two second grooves is also used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle first groove among the three first grooves. This allows the iron core portion between the two second grooves of the second iron core to simultaneously block the middle first groove among the three first grooves of the first iron core that accommodates the limiting member and the middle fourth groove among the three fourth grooves of the second iron core that accommodates another limiting member, making the stator structure simpler.

[0047] In one embodiment, the third core has the same structure as the second core. This reduces the number of core types, thereby reducing the types of laminations that make up the core, simplifying the stator structure, and lowering production costs.

[0048] In one embodiment, along the axial direction of the oil-cooled motor, the length of the core portion between the two second grooves is greater than or equal to the width of the third groove, which is opposite to the third groove along the radial direction of the stator. This allows the core portion between the two second grooves of the second core to simultaneously seal the middle first groove of the three first grooves in the first core that accommodates the limiting member and the middle fourth groove of the three fourth grooves in the second core that accommodates another limiting member, thus simplifying the stator structure.

[0049] In one embodiment, the inner wall of the housing further includes a fifth groove, which is arranged adjacent to and spaced apart from the third groove along the axial direction of the stator. The opening of the fifth groove is radially opposite to the opening of the middle of the three first grooves. The fifth groove is used to embed a limiting member. The core portion between the two second grooves of the first core is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the fifth groove.

[0050] In this embodiment, the fifth groove and the third groove are arranged adjacent to each other along the axial direction of the stator. The opening of the fifth groove is opposite to the opening of the middle first groove among the three first grooves along the radial direction of the stator. The fifth groove is used to embed the limiting member so that the limiting member is accommodated in the fifth groove of the housing and the middle first groove among the three first grooves of the first iron core, which can make the limiting member have a better limiting effect on the first iron core and the housing.

[0051] In this embodiment, the core portion between the two second grooves of the first core is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the fifth groove, thereby preventing coolant from leaking from the gap between the limiting member and the fifth groove. This is beneficial for more coolant to cool the stator and improve the cooling effect of the stator.

[0052] In one embodiment, the first, second, and third iron cores have the same structure. Along the axial direction of the oil-cooled motor, the first, second, and third iron cores are rotated and stacked. It is only necessary to ensure that the iron core portion between the two second grooves of the second iron core cooperates with the inner wall of the housing, so that the iron core portion between the two second grooves can block the middle first groove of the three first grooves in the first iron core that accommodates the limiting member, and the middle fourth groove of the three fourth grooves in the third iron core that accommodates another limiting member.

[0053] Secondly, this application provides a powertrain, which includes a reducer and an oil-cooled motor as described in the first aspect, wherein the motor shaft of the oil-cooled motor is driven to the input shaft of the reducer.

[0054] In the oil-cooled motor of this embodiment, the spacing between two adjacent second grooves of the second iron core along the circumferential direction of the stator is equal to the spacing between two first grooves located on both sides of the three adjacent first grooves of the first iron core. This allows the iron core portion between the two second grooves in the second iron core to seal the middle first groove of the three first grooves in the first iron core that accommodates the limiting member. The iron core portion between the two second grooves, in conjunction with the inner wall of the housing, prevents coolant from flowing from the third groove into the middle first groove of the three first grooves used to embed the limiting member. This prevents coolant from leaking from the gap between the limiting member and the middle first groove of the three first grooves, allowing more coolant to be used to cool the stator, which is beneficial for improving the cooling effect of the stator, thereby improving the cooling effect of the motor and ultimately improving the performance of the powertrain.

[0055] Thirdly, this application provides an electric vehicle, which includes a frame and a powertrain as described in the second aspect, the powertrain being used to receive electrical energy provided by a power battery to drive the wheels.

[0056] The powertrain in this embodiment includes an oil-cooled motor. By making the interval length between two adjacent second grooves of the second iron core of the oil-cooled motor equal to the interval length between two first grooves on both sides of the three adjacent first grooves of the first iron core along the circumference of the stator, the iron core portion between the two second grooves in the second iron core can seal the middle first groove of the three first grooves in the first iron core that accommodates the limiting member. The iron core portion between the two second grooves, in conjunction with the inner wall of the housing, prevents coolant from flowing from the third groove into the middle first groove of the three first grooves used to embed the limiting member. This prevents coolant from leaking from the gap between the limiting member and the middle first groove of the three first grooves, allowing more coolant to be used to cool the stator, which is beneficial to improving the cooling effect of the stator, the cooling effect of the motor and the powertrain, and thus improving the performance of the electric vehicle. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0058] Figure 1 This is a schematic diagram of an electric vehicle provided in an embodiment of this application;

[0059] Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application;

[0060] Figure 3 This is a schematic diagram of an oil-cooled motor provided in an embodiment of this application;

[0061] Figure 4 This is an exploded view of an oil-cooled motor provided in an embodiment of this application;

[0062] Figure 5 This is a schematic diagram of a stator provided in an embodiment of this application;

[0063] Figure 6 yes Figure 5 An exploded view of the stator in a machine;

[0064] Figure 7 yes Figure 5 A magnified view of a portion of the M1 section of the middle stator;

[0065] Figure 8 This is a cross-sectional view of an oil-cooled motor provided in an embodiment of this application;

[0066] Figure 9 yes Figure 8 A partial enlarged view of the M2 section of the oil-cooled motor in the image;

[0067] Figure 10 This is a schematic diagram of a first iron core provided in an embodiment of this application;

[0068] Figure 11 This is a schematic diagram of a second iron core provided in an embodiment of this application;

[0069] Figure 12 This is another schematic diagram of the first iron core provided in the embodiments of this application;

[0070] Figure 13 This is another schematic diagram of the first iron core provided in the embodiments of this application;

[0071] Figure 14 This is another schematic diagram of the stator provided in the embodiments of this application;

[0072] Figure 15 This is another schematic diagram of the stator provided in the embodiments of this application;

[0073] Figure 16 This is another cross-sectional view of the oil-cooled motor provided in the embodiments of this application;

[0074] Figure 17 This is a schematic diagram of a housing provided in an embodiment of this application;

[0075] Figure 18 This is another cross-sectional view of the oil-cooled motor provided in the embodiments of this application;

[0076] Figure 19This is another schematic diagram of the stator provided in the embodiments of this application. Detailed Implementation

[0077] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0078] This application provides a housing for an oil-cooled motor to accommodate and fix the stator of the oil-cooled motor. The stator includes a first iron core and a second iron core, which are arranged adjacent to each other along the axial direction of the oil-cooled motor. The outer circumferential surface of the first iron core includes three first grooves, which are arranged adjacent to each other along the circumferential direction of the stator. Each first groove connects to the end face of the first iron core facing the second iron core. The middle first groove is used to embed a limiting member to restrict the displacement between the first iron core and the housing. The outer circumferential surface of the second iron core includes two second grooves, which are arranged adjacent to each other along the circumferential direction of the stator. Each second groove connects to the end face of the second iron core facing the first iron core. The distance between the two second grooves along the circumferential direction of the stator is equal to the distance between the two outermost first grooves. The inner wall of the housing includes a third groove, which connects to the liquid inlet channel of the housing to receive coolant. The size of the third groove along the circumferential direction of the stator is larger than the distance between the two second grooves. The iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle first groove.

[0079] By making the interval length between two adjacent second grooves of the second iron core equal to the interval length between two first grooves on both sides of the three adjacent first grooves of the first iron core along the circumference of the stator, the iron core portion between the two second grooves in the second iron core can block the middle first groove of the three first grooves that accommodate the limiting member. The iron core portion between the two second grooves, in conjunction with the inner wall of the housing, prevents coolant from flowing from the third groove into the middle first groove of the three first grooves used to embed the limiting member. This prevents coolant from leaking from the gap between the limiting member and the middle first groove of the three first grooves, allowing all the coolant to be used to cool the stator, which is beneficial to improving the cooling effect of the stator.

[0080] The oil-cooled motor provided in this application embodiment is applied to the powertrain, which is then applied to an electric vehicle to improve the overall performance of the electric vehicle.

[0081] Figure 1 This is a schematic diagram of an electric vehicle 1 provided in an embodiment of this application.

[0082] In one embodiment, the electric vehicle 1 includes a frame 10, a powertrain 20, a power battery 30, and wheels 40. Wherein, as... Figure 1As shown, the powertrain 20 and the power battery 30 are fixed to the frame 10. The powertrain 20 receives power from the power battery 30 and drives the wheels 40. In this embodiment, the electric vehicle 1 refers to a wheeled device driven or towed by a power unit.

[0083] Figure 2 This is a schematic diagram of a powertrain 20 provided in an embodiment of this application. Figure 3 This is a schematic diagram of an oil-cooled motor 21 provided in an embodiment of this application.

[0084] In one embodiment, such as Figure 2 and Figure 3 As shown, the powertrain 20 includes a motor 21 and a reducer 22. The motor 21 includes a housing 100, a motor shaft (not shown), a stator 200, and a rotor (not shown). The housing 100 is used to house and fix the stator 200. The rotor is fixedly sleeved on the motor shaft. After receiving AC power, the stator 200 drives the rotor to rotate, thereby driving the motor shaft to rotate. The reducer 22 includes a gear assembly (not shown), an input shaft (not shown), and an output shaft (not shown). The input shaft receives the power transmitted from the motor shaft of the motor 21 and transmits the power to the output shaft through the gear assembly. The output shaft is driven by the half-shaft of the wheel 40 to drive the wheel 40 to rotate. In this embodiment, the stator 200 is cooled by coolant supplied through the housing 100 to prevent the motor 21 from malfunctioning due to overheating. In this embodiment, the motor 21 can also be referred to as an oil-cooled motor 21.

[0085] In one embodiment, the powertrain 20 further includes a motor controller 23, such as Figure 1 and Figure 2 As shown, the motor controller 23 is used to receive the DC power supplied by the power battery 30 and convert the DC power into AC power to drive the motor 21 to run.

[0086] During operation, the motor generates a large amount of heat, requiring the flow of oil through the stator for cooling. To limit the circumferential displacement between the stator and the housing, a limiting component needs to be inserted on the outer surface of the stator. Due to structural, process, and assembly tolerances, when oil is supplied to the outer surface of the stator core, the oil leaks from the gap between the limiting component and the contact surface between the housing and the stator core. This reduces the amount of oil delivered to other parts for cooling, resulting in less oil effectively participating in stator cooling and thus poor motor heat dissipation.

[0087] In this embodiment, the core portion between the two second grooves in the second core can be used to seal the middle first groove among the three first grooves in the first core that accommodates the limiting member. The core portion between the two second grooves, in conjunction with the inner wall of the housing, prevents coolant from flowing from the third groove into the middle first groove among the three first grooves used to embed the limiting member. This prevents coolant from leaking from the gap between the limiting member and the middle first groove among the three first grooves, allowing more coolant to be used to cool the stator, which is beneficial to improving the cooling effect of the stator.

[0088] The oil-cooled motor 21 provided in the embodiments of this application will be described in detail below.

[0089] Figure 4 This is an exploded view of the oil-cooled motor 21 provided in an embodiment of this application. Figure 5 This is a schematic diagram of a stator 200 provided in an embodiment of this application. Figure 6 yes Figure 5 An exploded view of stator 200 in the middle. Figure 7 yes Figure 5 A magnified view of a portion of the M1 section of the middle stator 200. Figure 8 This is a cross-sectional view of the oil-cooled motor 21 provided in an embodiment of this application. Figure 9 yes Figure 8 A partial enlarged view of the M2 section of the oil-cooled motor 21.

[0090] In one embodiment, such as Figure 3 and Figure 4 As shown, the housing 100 of the oil-cooled motor 21 is used to accommodate and fix the stator 200 of the oil-cooled motor 21. The stator 200 includes a first iron core 210 and a second iron core 220, which are arranged adjacent to each other along the axial direction O of the oil-cooled motor 21. Wherein, as Figures 5 to 7 As shown, the outer peripheral surface 211 of the first iron core 210 includes three first grooves 212. The three first grooves 212 are arranged adjacently along the circumferential direction C of the stator 200. Each first groove 212 connects to the end face 213 of the first iron core 210 facing the second iron core 220. The first groove 212a located in the middle of the three first grooves 212 is used to embed the limiting member 300a, such as... Figure 8 and Figure 9 As shown, the limiting member 300a is used to limit the displacement between the first iron core 210 and the housing 100. Figures 5 to 7As shown, the outer peripheral surface 221 of the second iron core 220 includes two second grooves 222. The two second grooves 222 are arranged adjacently along the circumferential direction C of the stator 200. Each second groove 222 connects to the end face 223 of the second iron core 220 facing the first iron core 210. The interval between the two second grooves 222 along the circumferential direction C of the stator 200 is equal to the interval between the two first grooves 212b located on both sides of the three first grooves 212. Figure 4 , Figure 8 and Figure 9 As shown, the inner wall 110 of the housing 100 includes a third groove 120, which is used to connect to the liquid inlet channel 130 of the housing 100 to receive coolant. The dimension of the third groove 120 along the circumferential direction C of the stator 200 is larger than the interval between the two second grooves 222. Figure 7 and Figure 9 As shown, the core portion 224 between the two second grooves 222 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a among the three first grooves 212.

[0091] In the embodiments of this application, such as Figure 6 As shown, three first grooves 212 are arranged adjacently along the circumferential direction C of the stator 200. Each first groove 212 is connected to the end face 213 of the first iron core 210 facing the second iron core 220. The first groove 212a located in the middle of the three first grooves 212 is used to embed the limiting member 300a. The limiting member 300a is used to limit the displacement between the first iron core 210 and the housing 100, so that the first groove of the first iron core 210, which was originally used to receive coolant, can be directly used to accommodate the limiting member 300a without the need to open an additional receiving groove for the limiting member 300a, making the structure simpler.

[0092] In this embodiment, each second groove 222 connects to the end face 223 of the second core 220 facing the first core 210. The interval between two second grooves 222 along the circumferential direction C of the stator 200 is equal to the interval between the two first grooves 212b located on both sides of the three first grooves 212. This allows the core portion 224 between the two second grooves 222 to block the first groove 212a located in the middle of the three first grooves 212, thereby preventing the coolant in the third groove 120 from flowing into the first groove 212a located in the middle of the three first grooves 212 and preventing the coolant from leaking from the gap between the limiting member 300a and the first groove 212a located in the middle of the three first grooves 212. This allows more coolant to cool the stator 200 and improve the cooling effect of the stator 200.

[0093] In this embodiment, the inner wall 110 of the housing 100 includes a third groove 120. The third groove 120 is used to connect the liquid inlet channel 130 of the housing 100 to receive coolant. The size of the third groove 120 along the circumferential direction C of the stator 200 is larger than the interval between the two second grooves 222, so that the iron core portion 224 between the two second grooves 222 will not completely block the third groove 120. This allows the coolant input into the liquid inlet channel 130 of the housing 100 to flow along the circumferential direction C of the stator 200 into the two second grooves 222. The circumferential distance between the two second grooves 222 of the sub-200 is equal to the distance between the two first grooves 212b located on both sides of the three first grooves 212. Each first groove 212 is connected to the end face 213 of the first iron core 210 facing the second iron core 220, and each second groove 222 is connected to the end face 223 of the second iron core 220 facing the first iron core 210. This allows the coolant in the two second grooves 222 to be input into the two first grooves 212b located on both sides of the three first grooves 212 along the axial direction O of the oil-cooled motor 21, thereby cooling the first iron core 210.

[0094] In this embodiment, the core portion 224 between the two second grooves 222 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a of the three first grooves 212. The middle first groove 212a of the three first grooves 212 is used to embed the limiting member 300a, thereby preventing the coolant in the third groove 120 from leaking into the gap between the middle first groove 212a of the three first grooves 212 and the limiting member 300a. This allows more coolant to be used to cool the stator 200, which is beneficial to improving the cooling effect of the stator 200.

[0095] In the embodiments of this application, such as Figure 7 As shown, along the circumferential direction C of the stator 200, the interval length between two adjacent second grooves 222 of the second core 220 is equal to the interval length between two first grooves 212b located on both sides of the three adjacent first grooves 212 of the first core 210. This allows the core portion 224 between the two second grooves 222 in the second core 220 to block the middle first groove 212a of the three first grooves 212 in the first core 210 that accommodates the limiting member 300a. The core portion 224 between the two second grooves 222, in conjunction with the inner wall 110 of the housing 100, prevents coolant from flowing from the third groove 120 into the middle first groove 212a of the three first grooves 212 used to embed the limiting member 300a. This prevents coolant from leaking from the gap between the limiting member 300a and the middle first groove 212a of the three first grooves 212, allowing more coolant to be used to cool the stator 200, which is beneficial to improving the cooling effect of the stator 200.

[0096] In one embodiment, such as Figure 4 As shown, the third groove 120 is arranged around the inner wall 110 of the housing 100 along the circumferential direction C of the stator 200, so that the outer peripheral surface 221 of the second iron core 220 can be cooled by the coolant from the liquid inlet channel 130 of the housing 100. Furthermore, the coolant can flow from the outer peripheral surface 221 of the second iron core 220 along the axial direction O of the oil-cooled motor 21 to the outer peripheral surface 211 of the first iron core 210, thereby cooling the first iron core 210.

[0097] In one embodiment, such as Figure 7 and Figure 8 As shown, along the circumferential direction C of the stator 200, the length of the core portion 224 between the two second grooves 222 is greater than the groove width of the middle first groove 212a among the three first grooves 212.

[0098] In this embodiment, along the circumferential direction C of the stator 200, the length of the core portion 224 between the two second grooves 222 is denoted as L1, and the groove width of the middle first groove 212a among the three first grooves 212 is denoted as L2. Since L1 > L2, the larger L1 allows the core portion 224 between the two second grooves 222 to better seal the middle first groove 212a among the three first grooves 212 that accommodates the limiting member 300a. This prevents coolant from flowing from the third groove 120 into the middle first groove 212a among the three first grooves 212, thereby preventing coolant leakage from the gap between the limiting member 300a and the middle first groove 212a among the three first grooves 212. This allows more coolant to cool the stator 200, improving the cooling effect of the coolant on the stator 200.

[0099] Figure 10 This is a schematic diagram of the first iron core 210 provided in an embodiment of this application. Figure 11 This is a schematic diagram of a second iron core 220 provided in an embodiment of this application.

[0100] In one embodiment, such as Figure 7 As shown, along the radial direction R of the stator 200, the length of the core portion 224 between the two second grooves 222 is greater than the groove depth of the middle first groove 212a among the three first grooves 212.

[0101] In the embodiments of this application, such as Figure 7 , Figures 9 to 11As shown, along the radial direction R of the stator 200, the length of the core portion 224 between the two second grooves 222 is greater than the groove depth of the middle first groove 212a among the three first grooves 212. The larger length of the core portion 224 between the two second grooves 222 allows the core portion 224 between the two second grooves 222 to seal the middle first groove 212a among the three first grooves 212 that accommodates the limiting member 300a along the radial direction R of the stator 200. It also allows the core portion 224 between the two second grooves 222 to better seal the middle first groove 212a among the three first grooves 212, preventing coolant from flowing from the third groove 120 into the middle first groove 212a among the three first grooves 212. This prevents coolant from leaking from the gap between the limiting member 300a and the middle first groove 212a among the three first grooves 212, allowing more coolant to cool the stator 200 and improving the cooling effect of the coolant on the stator 200.

[0102] In one embodiment, such as Figure 7 , Figure 10 and Figure 11 As shown, one of the two second grooves 222, 222a, connects to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c; the other of the two second grooves 222, 222b, connects to the other of the two first grooves 212b located on both sides of the three first grooves 212, 212d. Wherein, as... Figure 10 As shown, along the circumferential direction C of the stator 200, the groove width of at least one of the two first grooves 212b located on both sides, 212c and the other 212d, is greater than the groove width of the first groove 212a located in the middle of the three first grooves 212.

[0103] In this embodiment, one of the two second grooves 222, 222a, connects to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c, so that one of the two second grooves 222, 222a, can deliver coolant to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c. The other of the two second grooves 222, 222b, connects to the other of the two first grooves 212b located on both sides of the three first grooves 212, 212d, so that the other of the two second grooves 222, 222b, can deliver coolant to the other of the two first grooves 212b located on both sides of the three first grooves 212, 212d. This allows coolant to flow along the axial direction O of the oil-cooled motor 21 on the outer surface of the stator 200 from the second iron core 220 to the first iron core 210, dissipating heat from the stator 200.

[0104] In the embodiments of this application, such as Figure 7 , Figures 9 to 11 As shown, the middle groove 212a of the three first grooves 212 used to accommodate the limiting member 300a is blocked, so that the coolant does not flow through the middle groove 212a of the three first grooves 212, and the heat dissipation effect of the first iron core 210 is affected. Along the circumferential direction C of the stator 200, the width of at least one of the two side first grooves 212b (212c and 212d) is greater than the width of the middle first groove 212a. The larger width of at least one of the two side first grooves 212b (212c and 212d) allows the two side first grooves 212b to receive more coolant and increases the heat dissipation area between the coolant and the two side first grooves 212b. This indirectly enhances the heat dissipation effect of the stator 200 near the middle first groove 212a, ensuring the cooling effect of the stator 200 while preventing coolant leakage from the gap between the middle first groove 212a and the limiting member 300a.

[0105] Figure 12 This is another schematic diagram of the first iron core 210 provided in the embodiments of this application.

[0106] In one embodiment, such as Figure 7 , Figure 11 and Figure 12 As shown, one of the two second grooves 222, 222a, connects to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c; the other of the two second grooves 222, 222b, connects to the other of the two first grooves 212b located on both sides of the three first grooves 212, 212d. Wherein, as... Figure 12 As shown, along the radial direction R of the stator 200, the groove depth of at least one of the two first grooves 212b located on both sides, 212c and the other 212d, is greater than the groove depth of the first groove 212a located in the middle of the three first grooves 212.

[0107] In this embodiment, one of the two second grooves 222, 222a, connects to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c, so that one of the two second grooves 222, 222a, can deliver coolant to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c. The other of the two second grooves 222, 222b, connects to the other of the two first grooves 212b located on both sides of the three first grooves 212, 212d, so that the other of the two second grooves 222, 222b, can deliver coolant to the other of the two first grooves 212b located on both sides of the three first grooves 212, 212d. This allows the coolant to flow along the axial direction O of the oil-cooled motor 21 from the second core 220 to the first core 210, dissipating heat from the stator 200.

[0108] In the embodiments of this application, such as Figure 7 , Figure 9 , Figure 11 and Figure 12 As shown, the middle first groove 212a of the three first grooves 212 used to accommodate the limiting member 300a is blocked by the iron core portion 224 between the two second grooves 222, so that the coolant does not flow through the middle first groove 212a of the three first grooves 212, and the heat dissipation effect of the first iron core 210 is affected. Along the radial direction R of the stator 200, the groove depth of at least one of the two side grooves 212b (212c and 212d) is greater than the groove depth of the middle groove 212a. The larger groove depth of at least one of the two side grooves 212b (212c and 212d) allows the two side grooves 212b to receive more coolant and increases the heat dissipation area between the coolant and the two side grooves 212b. This indirectly enhances the heat dissipation effect of the portion of the first core 210 near the middle groove 212a. While preventing coolant leakage from the gap between the middle groove 212a and the limiting member 300a, the cooling effect of the stator 200 is ensured.

[0109] Figure 13 This is another schematic diagram of the first iron core 210 provided in the embodiments of this application.

[0110] In one embodiment, such as Figure 7 , Figure 11 and Figure 13As shown, one of the two second grooves 222, 222a, connects to one of the two first grooves 212b located on both sides of the three first grooves 212. One of the two first grooves 212b located on both sides of the three first grooves 212, 212c, includes at least two first sub-grooves 2121. These at least two first sub-grooves 2121 are arranged adjacent to each other along the circumferential direction C of the stator 200. Along the circumferential direction C of the stator 200, the distance between two adjacent first sub-grooves 2121 is less than the distance between the middle first groove 212a and one of the two first grooves 212b located on both sides of the three first grooves 212. The width of each first sub-grooves 2121 is less than the width of the middle first groove 212a among the three first grooves 212.

[0111] In this embodiment of the application, one of the two second grooves 222, 222a, is connected to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c, which includes at least two first sub-grooves 2121, such that one of the two second grooves 222, 222a, can deliver coolant to at least two first sub-grooves 2121.

[0112] In the embodiments of this application, such as Figure 7 , Figure 9 , Figure 11 and Figure 13 As shown, along the circumferential direction C of the stator 200, the distance between two adjacent first sub-grooves 2121 is less than the distance between the middle first groove 212a and one of the two side first grooves 212b 212c among the three first grooves 212. The groove width of each first sub-grooves 2121 is less than the groove width of the middle first groove 212a among the three first grooves 212. This makes at least two first sub-grooves 2121 arranged compactly. Without widening the groove width of one of the two side first grooves 212b 212c among the three first grooves 212, the heat dissipation area of ​​the coolant and one of the side first grooves 212b 212c among the three first grooves 212 can be increased, which is beneficial to improving the cooling effect of the first core 210, and thus improving the cooling effect of the stator 200.

[0113] Figure 14 This is another schematic diagram of the stator 200 provided in the embodiments of this application.

[0114] In one embodiment, such as Figure 14As shown, one of the two second grooves 222, 222a, connects to one of the two first grooves 212b located on both sides of the three first grooves 212. Along the circumferential direction C of the stator 200, the groove width of one of the two second grooves 222a is greater than the groove width of one of the two first grooves 212b located on both sides of the three first grooves 212.

[0115] In this embodiment of the application, one of the two second grooves 222a is connected to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c, so that one of the two second grooves 222a can deliver coolant to one of the two first grooves 212b located on both sides of the three first grooves 212.

[0116] In the embodiments of this application, such as Figure 9 and Figure 14 As shown, along the circumferential direction C of the stator 200, the groove width of one of the two second grooves 222a is denoted as L3, and the groove width of one of the two first grooves 212b located on both sides of the three first grooves 212 is denoted as L4. L3 > L4, and L3 is larger, which allows one of the two second grooves 222a to receive more coolant from the third groove 120, and also allows one of the two second grooves 222a to deliver more coolant to one of the two first grooves 212b located on both sides of the three first grooves 212. L4 is smaller, which allows the coolant to flow faster in one of the two first grooves 212b located on both sides of the three first grooves 212 when one of the two second grooves 222a delivers more coolant to one of the two first grooves 212b located on both sides of the three first grooves 212. This is beneficial to accelerating the cooling efficiency of the coolant on the first iron core 210, thereby enhancing the cooling effect of the stator 200.

[0117] Figure 15 This is another schematic diagram of the stator 200 provided in the embodiments of this application.

[0118] In one embodiment, such as Figure 15 As shown, one of the two second grooves 222, 222a, connects to one of the two first grooves 212b located on both sides of the three first grooves 212. The outer peripheral surface 221 of the second core 220 includes another second groove 225, which is arranged adjacent to one of the two second grooves 222a along the circumferential direction C of the stator 200. The other second groove 225 connects to one of the two first grooves 212b located on both sides of the three first grooves 212.

[0119] In this embodiment of the application, one of the two second grooves 222a is connected to one of the two first grooves 212b located on both sides of the three first grooves 212, 212c, so that one of the two second grooves 222a can deliver coolant to one of the two first grooves 212b located on both sides of the three first grooves 212.

[0120] In this embodiment, the middle first groove 212a of the three first grooves 212 used to accommodate the limiting member 300a is blocked by the core portion 224 between the two second grooves 222, preventing coolant from flowing through the middle first groove 212a and affecting the heat dissipation of the first core 210. Another second groove 225 is arranged adjacent to one of the two second grooves 222a along the circumferential direction C of the stator 200, connecting to one of the two first grooves 212b located on either side of the three first grooves 212 (212c). This allows one of the two second grooves 222a and its adjacent second groove 225 to supply coolant to one of the two first grooves 212b located on either side of the three first grooves 212. This allows one of the two first grooves 212b located on either side of the three first grooves 212 (212c) to receive more coolant, improving the cooling efficiency of the coolant on the first core 210 and thus enhancing the cooling effect of the stator 200.

[0121] In one embodiment, such as Figure 9 As shown, along the radial direction R of the stator 200, the core portion 224 between the two second grooves 222 is arranged opposite to the third groove 120. The core portion 224 between the two second grooves 222 is embedded in a portion of the third groove 121 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a among the three first grooves 212. A portion of the third groove 121 and the limiting member 300a are arranged adjacent to each other along the axial direction O of the stator 200.

[0122] In the embodiments of this application, such as Figure 7 and Figure 9 As shown, along the radial direction R of the stator 200, the core portion 224 between the two second grooves 222 is arranged opposite to the third groove 120, such that the core portion 224 between the two second grooves 222 can be embedded in a portion of the third groove 121, thereby isolating the third groove 120 from the first groove 212a located in the middle of the three first grooves 212.

[0123] In this embodiment, the core portion 224 between the two second grooves 222 is embedded in a portion of the third groove 121 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a of the three first grooves 212. This allows the core portion 224 between the two second grooves 222 to be interference-fitted with the groove wall of the middle third groove 121. The middle third groove 121 and the limiting member 300a are arranged adjacent to each other along the axial direction O of the stator 200, so that the coolant in the third groove 120 does not flow into the middle first groove 212a of the three first grooves 212 that accommodates the limiting member 300a. This prevents coolant from leaking from the gap between the middle first groove 212a and the limiting member 300a, thereby allowing more coolant to be used to cool the stator 200 and improving the cooling effect of the stator 200.

[0124] Figure 16 This is another cross-sectional view of the oil-cooled motor 21 provided in the embodiments of this application.

[0125] In one embodiment, such as Figure 15 and Figure 16 As shown, the core portion 224 between the two second grooves 222 is used to cooperate with a portion of the inner wall 111 of the housing 100 between the third groove 120 and the middle first groove 212a of the three first grooves 212 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a of the three first grooves 212.

[0126] In this embodiment, the core portion 224 between the two second grooves 222 is used to cooperate with a portion of the inner wall 111 of the housing 100 between the third groove 120 and the middle first groove 212a among the three first grooves 212 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a among the three first grooves 212. This allows the core portion 224 between the two second grooves 222 to abut and press against the portion of the inner wall 111 of the housing 100 along the radial direction R of the stator 200, thereby enabling the third... The groove 120 is isolated from the middle first groove 212a among the three first grooves 212 by the iron core portion 224 between the two second grooves 222, thereby preventing the coolant in the third groove 120 from flowing into the middle first groove 212a among the three first grooves 212. This also prevents the coolant from leaking from the gap between the middle first groove 212a and the limiting member 300a, allowing more coolant to be used to cool the stator 200, which is beneficial to improving the cooling effect of the stator 200.

[0127] Figure 17 This is a schematic diagram of a housing 100 provided in an embodiment of this application.

[0128] In one embodiment, such as Figure 9 and Figure 17 As shown, along the radial direction R of the stator 200, the groove depth of a portion of the third groove 121 into which the core portion 224 between the two second grooves 222 is embedded is less than the groove depth of the other portion of the third groove 122 in the third groove 120, excluding the portion of the third groove 121. Along the axial direction O of the stator 200, the groove width of the portion of the third groove 121 is greater than the axial width of the core portion 224 between the two second grooves 222.

[0129] In the embodiments of this application, such as Figure 4 , Figure 9 and Figure 17 As shown, the core portion 224 between the two second grooves 222 is embedded in a portion of the third groove 121. The depth of the portion of the third groove 121 into which the core portion 224 between the two second grooves 222 is embedded is less than the depth of the other portion of the third groove 122 in the third groove 120 excluding the portion of the third groove 121. The smaller depth of the portion of the third groove 121 allows less coolant to flow through the gap between the core portion 224 between the two second grooves 222 and the portion of the third groove 121. It can even allow the core portion 224 between the two second grooves 222 to abut against the bottom of the portion of the third groove 121, preventing coolant from flowing through the two grooves. The core portion 224 between the second groove 222 and a portion of the third groove 121 is more conducive to better sealing of the middle first groove 212a among the three first grooves 212 that accommodates the limiting member 300a. This prevents coolant from flowing from the third groove 120 into the middle first groove 212a among the three first grooves 212, and prevents coolant leakage from the gap between the middle first groove 212a and the limiting member 300a. This allows more coolant to be used to cool the stator 200, which is beneficial to improving the cooling effect of the stator 200. The deeper groove of the third groove 122 (excluding a portion of the third groove 121) allows the third groove 122 to have a larger volume to accommodate the coolant input through the liquid inlet channel 130 of the housing 100, further improving the cooling effect of the stator 200.

[0130] In the embodiments of this application, such as Figure 9As shown, along the axial direction O of the stator 200, the width of a portion of the third groove 121 is greater than the axial width of the core portion 224 between the two second grooves 222. The width of the portion of the third groove 121 with a smaller groove depth is widened to allow the coolant to flow along the circumferential direction C of the stator 200 within the third groove 120, avoiding the core portion 224 between the two second grooves 222. This ensures the flow of coolant within the third groove 121 and thus guarantees the cooling effect of the coolant on the stator 200.

[0131] Figure 18 This is another cross-sectional view of the oil-cooled motor 21 provided in the embodiments of this application.

[0132] In one embodiment, such as Figure 18 As shown, a portion of the third groove 121 near the groove wall 121a of the limiting member 300a includes a protrusion 1211. The protrusion 1211 protrudes towards the stator 200 along the radial direction R of the stator 200. The protrusion 1211 is opposite to the middle first groove 212a of the three first grooves 212 along the radial direction R of the stator 200. The protrusion 1211 is used to cooperate with the core portion 224 between the two second grooves 222 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a of the three first grooves 212. Along the circumferential direction C of the stator 200, the length of the protrusion 1211 is less than the groove width of the middle first groove 212a of the three first grooves 212. Along the radial direction R of the stator 200, the length of the protrusion 1211 is less than the groove depth of the middle first groove 212a of the three first grooves 212.

[0133] In this embodiment, the core portion 224 between the two second grooves 222 is used to block the first groove 212a located in the middle of the three first grooves 212. A portion of the third groove 121 near the groove wall 121a of the limiting member 300a includes a protrusion 1211. The protrusion 1211 protrudes towards the stator 200 along the radial direction R of the stator 200. The protrusion 1211 is opposite to the first groove 212a located in the middle of the three first grooves 212 along the radial direction R of the stator 200. This makes it easier for the core portion 224 between the two second grooves 222 to cooperate with the protrusion 1211 of the third groove 120 to prevent coolant from flowing from the third groove 120 into the first groove 212a located in the middle of the three first grooves 212.

[0134] In this embodiment of the application, the protrusion 1211 is opposite to the middle first groove 212a of the three first grooves 212 along the radial R of the stator 200, so that the protrusion 1211 can play a positioning role in the assembly process of the stator 200 and the housing 100.

[0135] In this embodiment of the application, along the circumferential direction C of the stator 200, the length of the protrusion 1211 is less than the width of the first groove 212a located in the middle of the three first grooves 212. The length of the protrusion 1211 along the circumferential direction C of the stator 200 is small, so that during the process of assembling the stator 200 into the housing 100, a portion of the protrusion 1211 of the third groove 121 can pass through the first groove 212a located in the middle of the three first grooves 212, and the protrusion 1211 will not hinder the assembly process of the stator 200.

[0136] In this embodiment, along the radial direction R of the stator 200, the length of the protrusion 1211 is less than the groove depth of the middle first groove 212a among the three first grooves 212. The length of the protrusion 1211 along the radial direction R of the stator 200 is small, so that during the process of assembling the stator 200 into the housing 100, it is only necessary to align the middle first groove 212a among the three first grooves 212 with the protrusion 1211 along the axial direction O of the stator 200. The protrusion 1211 can pass through the middle first groove 212a among the three first grooves 212, so that the protrusion 1211 will not affect the assembly of the stator 200.

[0137] Figure 19 This is another schematic diagram of the stator 200 provided in the embodiments of this application.

[0138] In one embodiment, such as Figure 4 and Figure 19 As shown, the stator 200 also includes a third iron core 230. The third iron core 230, the second iron core 220 and the first iron core 210 are arranged adjacent to each other along the axial direction O of the oil-cooled motor 21. The outer peripheral surface 231 of the third iron core 230 includes three fourth grooves 232. The three fourth grooves 232 are arranged adjacent to each other along the circumferential direction C of the stator 200. Each fourth groove 232 connects to the end face of the third iron core 230 facing the second iron core 220. The fourth groove 232a located in the middle of the three fourth grooves 232 is used to embed another limiting member 300b. The other limiting member 300b is used to limit the displacement between the third iron core 230 and the housing 100. Each second groove 222 connects to the end face of the second iron core 220 facing the third iron core 230. The interval between two second grooves 222 along the circumferential direction C of the stator 200 is equal to the interval between the two fourth grooves 232b located on both sides of the three fourth grooves 232. The iron core portion 224 between the two second grooves 222 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the middle fourth groove 232a of the three fourth grooves 232.

[0139] In this embodiment, the outer peripheral surface 231 of the third core 230 includes three fourth grooves 232. The three fourth grooves 232 are arranged adjacently along the circumferential direction C of the stator 200. Each fourth groove 232 is connected to the end face of the third core 230 facing the second core 220. The fourth groove 232a located in the middle of the three fourth grooves 232 is used to embed another limiting member 300b, so that the first core 210 and the third core 230 are respectively embedded in the limiting member 300a and the other limiting member 300b, so that the stator 200 and the housing 100 are circumferentially limited by the two limiting members 300a and 300b, thereby making the circumferential limitation between the housing 100 and the stator 200 more reliable.

[0140] In this embodiment, the interval between the two second grooves 222 along the circumferential direction C of the stator 200 is equal to the interval between the two fourth grooves 232b located on both sides of the three fourth grooves 232. The core portion 224 between the two second grooves 222 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the fourth groove 232a located in the middle of the three fourth grooves 232, and to prevent coolant in the third groove 120 from flowing to the fourth groove 232a located in the middle of the three fourth grooves 232, thereby preventing coolant from leaking from the gap between another limiting member 300b and the fourth groove 232a located in the middle of the three fourth grooves 232. This allows more coolant to cool the stator 200 and improve the cooling effect of the stator 200.

[0141] In this embodiment, the core portion 224 between the two second grooves 222 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the middle fourth groove 232a of the three fourth grooves 232. The core portion 224 between the two second grooves 222 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the middle first groove 212a of the three first grooves 212. This allows the core portion 224 between the two second grooves 222 of the second core 220 to simultaneously block the middle first groove 212a of the three first grooves 212 of the first core 210 that accommodates the limiting member 300a and the middle fourth groove 232a of the three fourth grooves 232 of the second core 220 that accommodates another limiting member 300b, making the structure of the stator 200 simpler.

[0142] In one embodiment, the structure of the third core 230 is the same as that of the second core 220. This reduces the number of core types, thereby reducing the types of laminations that make up the cores, simplifying the structure of the stator 200, and lowering production costs.

[0143] In one embodiment, along the axial direction O of the oil-cooled motor 21, the length of the core portion 224 between the two second grooves 222 is greater than or equal to the groove width of the third groove 120 opposite to it along the radial direction R of the stator 200. This facilitates the simultaneous sealing of the middle first groove 212a of the three first grooves 212 of the first core 210 accommodating the limiting member 300a and the middle fourth groove 232a of the three fourth grooves 232 of the second core 220 accommodating another limiting member 300b by the core portion 224 between the two second grooves 222 of the second core 220, making the structure of the stator 200 simpler.

[0144] In one embodiment, such as Figure 4 and Figure 17 As shown, the inner wall 110 of the housing 100 also includes a fifth groove 140. The fifth groove 140 and the third groove 120 are arranged adjacent to each other along the axial direction O of the stator 200. The opening of the fifth groove 140 is opposite to the opening of the middle first groove 212a of the three first grooves 212 along the radial direction R of the stator 200. The fifth groove 140 is used to embed the limiting member 300a. The core portion 224 between the two second grooves 222 of the first core 210 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the fifth groove 140.

[0145] In this embodiment, the fifth groove 140 and the third groove 120 are arranged adjacent to each other along the axial direction O of the stator 200. The opening of the fifth groove 140 is opposite to the opening of the middle first groove 212a among the three first grooves 212 along the radial direction R of the stator 200. The fifth groove 140 is used to embed the limiting member 300a so that the limiting member 300a is accommodated in the fifth groove 140 of the housing 100 and the middle first groove 212a among the three first grooves 212 of the first iron core 210, which can make the limiting member 300a have a better limiting effect on the first iron core 210 and the housing 100.

[0146] In this embodiment, the core portion 224 between the two second grooves 222 of the first core 210 is used to cooperate with the inner wall 110 of the housing 100 to prevent coolant from flowing from the third groove 120 into the fifth groove 140, thereby preventing coolant from leaking from the gap between the limiting member 300a and the fifth groove 140. This is beneficial for more coolant to cool the stator 200 and improve the cooling effect of the stator 200.

[0147] In one embodiment, the first iron core 210, the second iron core 220, and the third iron core 230 have the same structure. Along the axial direction O of the oil-cooled motor 21, the first iron core 210, the second iron core 220, and the third iron core 230 are rotated and stacked. It is only necessary to ensure that the iron core portion between the two second grooves 222 of the second iron core 220 cooperates with the inner wall 110 of the housing 100, so that the iron core portion 224 between the two second grooves 222 can block the first groove 212a located in the middle of the three first grooves 212 in the first iron core 210 that accommodates the limiting member 300a, and the fourth groove 232a located in the middle of the three fourth grooves 232 in the third iron core 230 that accommodates another limiting member 300b.

[0148] The oil-cooled motor, powertrain, and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the embodiments above is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An oil-cooled motor, characterized in that, The housing of the oil-cooled motor is used to house and fix the stator of the oil-cooled motor. The stator includes a first iron core and a second iron core, which are arranged adjacent to each other along the axial direction of the oil-cooled motor. The outer peripheral surface of the first iron core includes three first grooves, which are arranged adjacent to each other along the circumference of the stator. Each first groove is connected to the end face of the first iron core facing the second iron core. The first groove in the middle of the three first grooves is used to embed a limiting member, which is used to limit the displacement between the first iron core and the housing. The outer peripheral surface of the second iron core includes two second grooves, which are arranged adjacent to each other along the circumference of the stator. Each second groove connects to the end face of the second iron core facing the first iron core. The interval between the two second grooves along the circumference of the stator is equal to the interval between the two first grooves located on both sides of the three first grooves. The inner wall of the housing includes a third groove for connecting the liquid inlet channel of the housing to receive coolant. The size of the third groove along the circumference of the stator is larger than the interval between the two second grooves. The iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the first groove located in the middle of the three first grooves.

2. The oil-cooled motor according to claim 1, characterized in that, Along the circumference of the stator, the length of the core portion between the two second grooves is greater than the width of the middle first groove among the three first grooves.

3. The oil-cooled motor according to any one of claims 1-2, characterized in that, Along the radial direction of the stator, the length of the core portion between the two second grooves is greater than the groove depth of the middle first groove among the three first grooves.

4. The oil-cooled motor according to any one of claims 1-3, characterized in that, One of the two second grooves connects to one of the two first grooves located on both sides of the three first grooves, and the other of the two second grooves connects to the other of the two first grooves located on both sides of the three first grooves, wherein: Along the circumference of the stator, the width of at least one of the two first grooves located on both sides of the three first grooves is greater than the width of the first groove located in the middle of the three first grooves.

5. The oil-cooled motor according to any one of claims 1-4, characterized in that, One of the two second grooves connects to one of the two first grooves located on both sides of the three first grooves, and the other of the two second grooves connects to the other of the two first grooves located on both sides of the three first grooves, wherein: Along the radial direction of the stator, the groove depth of at least one of the two first grooves located on both sides of the three first grooves is greater than the groove depth of the first groove located in the middle of the three first grooves.

6. The oil-cooled motor according to any one of claims 1-5, characterized in that, One of the two second grooves connects to one of the two first grooves located on both sides of the three first grooves. The one of the two first grooves located on both sides of the three first grooves includes at least two first sub-grooves, which are arranged adjacent to each other along the circumference of the stator. Along the circumference of the stator, the distance between two adjacent first sub-grooves is less than the distance between the middle first groove and one of the two first grooves on either side of the three first grooves, and the groove width of each first sub-grooves is less than the groove width of the middle first groove among the three first grooves.

7. The oil-cooled motor according to any one of claims 1-6, characterized in that, One of the two second grooves connects to one of the two first grooves located on both sides of the three first grooves, wherein: Along the circumference of the stator, the width of one of the two second grooves is greater than the width of one of the two first grooves located on both sides of the three first grooves.

8. The oil-cooled motor according to any one of claims 1-6, characterized in that, One of the two second grooves connects to one of the two first grooves located on both sides of the three first grooves. The outer peripheral surface of the second iron core includes another second groove, which is arranged adjacent to one of the two second grooves along the circumferential direction of the stator. The other second groove connects to one of the two first grooves located on either side of the three first grooves.

9. The oil-cooled motor according to any one of claims 1-8, characterized in that, Along the radial direction of the stator, the core portion between the two second grooves is arranged opposite to the third groove, wherein: The core portion between the two second grooves is used to embed into a portion of the third groove to prevent coolant from flowing from the third groove into the middle first groove among the three first grooves. The portion of the third groove is arranged adjacent to the limiting member along the axial direction of the stator.

10. The oil-cooled motor according to any one of claims 1-8, characterized in that, The core portion between the two second grooves serves to cooperate with a portion of the inner wall of the housing between the third groove and the middle first groove of the three first grooves to prevent coolant from flowing from the third groove into the middle first groove of the three first grooves.

11. The oil-cooled motor according to claim 9, characterized in that, Along the radial direction of the stator, the groove depth of the portion of the third groove into which the core portion is embedded between the two second grooves is less than the groove depth of the other portion of the third groove besides the portion of the third groove; Along the axial direction of the stator, the width of the third groove portion is greater than the axial width of the core portion between the two second grooves.

12. The oil-cooled motor according to claim 9 or 11, characterized in that, The third groove near the retaining member includes a protrusion along the radial direction of the stator. This protrusion faces the stator and is radially opposite to the middle of the three first grooves. The protrusion engages with the core portion between the two second grooves to prevent coolant from flowing from the third groove into the middle of the three first grooves. Along the circumference of the stator, the length of the protrusion is less than the width of the middle first groove among the three first grooves; Along the radial direction of the stator, the length of the protrusion is less than the groove depth of the middle of the three first grooves.

13. The oil-cooled motor according to any one of claims 9-12, characterized in that, The stator further includes a third iron core, which, along with the second and first iron cores, is arranged adjacent to each other along the axial direction of the oil-cooled motor. The outer circumferential surface of the third iron core includes three fourth grooves, which are arranged adjacent to each other along the circumferential direction of the stator. Each fourth groove communicates with the end face of the third iron core facing the second iron core. The middle fourth groove is used to embed another limiting member, which restricts the displacement between the third iron core and the housing. Each of the second grooves connects to the end face of the second iron core facing the third iron core. The interval between the two second grooves along the circumference of the stator is equal to the interval between the two fourth grooves located on both sides of the three fourth grooves. The iron core portion between the two second grooves is used to cooperate with the inner wall of the housing to prevent coolant from flowing from the third groove into the middle fourth groove of the three fourth grooves.

14. A powertrain, characterized in that, The powertrain includes a reducer and an oil-cooled motor as described in any one of claims 1-13, wherein the motor shaft of the oil-cooled motor is driven to the input shaft of the reducer.

15. An electric vehicle, characterized in that, The electric vehicle includes a frame and a powertrain as described in claim 14, the powertrain being configured to receive electrical energy supplied by a power battery to drive the wheels.

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