Stator oil duct structure of oil-cooled motor and motor thereof

Abstract

The utility model provides a stator oil duct structure of an oil cooling motor and a motor thereof, a stator assembly comprises a stator iron core formed by laminating stator punching sheets, and a shell is provided with an oil inlet; end cover assemblies are arranged at the two ends of the shell, and each end cover assembly is provided with an oil outlet. The stator punching sheet is provided with an oil inlet groove and an oil return groove, and the oil inlet groove and the oil return groove form an oil inlet staggered oil channel after being overlapped positively and negatively. Oil spraying ring assemblies with openings are arranged at the two ends of the stator assembly in a surrounding mode, and the oil spraying ring assemblies and the shell form a closed oil channel. The bottom of the stator core is provided with an oil return channel. Cooling oil passing through the oil inlet cools the stator and then leads to the oil outlet to an outer circulation oil channel of the motor from the oil return channel through the opening of the oil spraying ring assembly. According to the utility model, the cooling oil duct and the oil return duct are arranged on the stator core, so that a special oil return duct on a traditional casing is omitted, and the envelope size of the motor is reduced; in addition, only one type of stator punching sheet is provided, thereby facilitating material management and control.

Description

Technical Field

[0001] The utility model relates to the technical field of motor cooling, in particular to a stator oil channel structure of an oil-cooled motor and the motor. Background Art

[0002] Traditional water-cooled motors remove heat from the motor as cooling water flows through a water jacket located outside the motor housing. Heat generated within the motor is first transferred to the motor housing or the surface of the water channel, where it then exchanges heat with the cooling water. However, this cooling method suffers from the drawback that the coolant cannot directly cool heat sources such as the stator core, windings, rotor, and permanent magnets.

[0003] In order to solve the above technical problems, the current technical solution is to use an oil-cooled structure motor, whose cooling oil directly contacts the heat-generating components, which can effectively solve the heating problems of the iron core, winding and rotor, and is a new direction for the development of passenger car motor cooling methods.

[0004] The current main technical route is to set up a straight oil channel on the surface of the core, and then spray the oil to the end of the stator winding after cooling the stator core. For example, the Chinese invention patent with application number CN117833508A discloses a stator radial staggered oil circuit cooling motor, which includes a housing assembly, an end cover assembly, a stator assembly and a rotor assembly; the housing assembly and the end cover assembly cooperate with each other to form a cavity, and the stator assembly and the rotor assembly are installed inside the cavity, and the cavity is divided into a first cavity and a second cavity; the stator assembly includes multiple sections of stacked punching segments, and each punching segment has cooling channels distributed in the circumferential direction. The cooling channels of adjacent punching segments are interconnected and radially staggered, ultimately forming a stator radial staggered oil circuit; the radial staggered oil circuit connects the first cavity and the second cavity. However, due to the small flow resistance of the cooling oil in this solution, the heat removal effect is not ideal.

[0005] Furthermore, a further improved cooling solution is to set circumferentially staggered oil channels on the stator surface. For example, the Chinese invention patent with application number CN117833507A discloses a stator circumferentially staggered oil channel cooling motor, including a housing assembly, an end cover assembly, a stator assembly and a rotor assembly; the housing assembly and the end cover assembly cooperate with each other to form a cavity, the stator assembly and the rotor assembly are installed inside the cavity, and the cavity is divided into a first cavity and a second cavity; the stator assembly includes multiple sections of stacked punching segments, and cooling channels are distributed circumferentially on the punching segments. The cooling channels of adjacent punching segments are interconnected and circumferentially staggered, ultimately forming a staggered oil channel; the staggered oil channel connects the first cavity and the second cavity. Although the cooling effect achieved by this solution has been improved to a certain extent, it is necessary to set an oil return channel on the shell, which makes the shell structure complex and the outer envelope size larger.

[0006] It can be seen that the existing oil-cooled motor still has the following defects:

[0007] On the one hand, the motor housing needs to be equipped with a dedicated oil return channel, which occupies the outer envelope size of the motor.

[0008] On the other hand, the motor stator oil passages are straight-through, resulting in poor cooling effect; if the motor stator oil passages are staggered, multiple stator punching sheets are required, which is inconvenient for material control. Utility Model Content

[0009] The technical problem to be solved by the utility model is how to reduce the outer envelope size of the motor and improve the cooling effect in an oil-cooled motor.

[0010] In order to solve the above technical problems, the utility model provides a stator oil channel structure of an oil-cooled motor, the motor comprising a housing and a stator assembly built into the housing, the stator assembly comprising a stator core formed by stacking stator punching sheets,

[0011] The housing is provided with an oil inlet; both ends of the housing are provided with end cover assemblies, and the end cover assemblies are provided with an oil outlet;

[0012] The stator punching is provided with an oil inlet groove and an oil return groove, and the oil inlet groove and the oil return groove are overlapped in both directions to form an oil inlet staggered oil channel;

[0013] An oil sprinkler ring assembly with an opening is provided around the two ends of the stator assembly, and the oil sprinkler ring assembly and the housing form a closed oil channel; an oil return channel is provided at the bottom of the stator core; after cooling the stator through the cooling oil of the oil inlet, the cooling oil can pass through the opening of the oil sprinkler ring assembly from the oil return channel to the oil outlet to the external circulation oil channel of the motor.

[0014] Preferably, the stator assembly and the housing are interference fit.

[0015] Furthermore, the oil inlet groove is designed to be asymmetrical with respect to the radial direction of the stator punching sheet; and the oil return groove is designed to be symmetrical with respect to the radial direction of the stator punching sheet.

[0016] Furthermore, the oil return passage is arranged away from the oil inlet, and the oil return passage is designed to be symmetrical with respect to the radial direction of the stator punching sheet.

[0017] Furthermore, the oil sprinkler ring assembly includes a front oil sprinkler ring and a rear oil sprinkler ring, wherein the front oil sprinkler ring and the rear oil sprinkler ring are respectively fixed to the two ends of the stator assembly.

[0018] Furthermore, a front oil sprinkler ring opening and a rear oil sprinkler ring opening are respectively provided at corresponding positions of the front oil sprinkler ring and the rear oil sprinkler ring, and the front oil sprinkler ring opening and the rear oil sprinkler ring opening are arranged away from the oil inlet.

[0019] Furthermore, the front oil sprinkler ring and the rear oil sprinkler ring are respectively evenly provided with front oil sprinkler ring oil leakage holes and rear oil sprinkler ring oil leakage holes in the circumference, and the cooling oil at the oil inlet can be discharged to the oil outlet through the front oil sprinkler ring oil leakage holes, the rear oil sprinkler ring oil leakage holes and the front oil sprinkler ring opening and the rear oil sprinkler ring opening respectively.

[0020] Furthermore, the end cover assembly includes a front end cover and a rear end cover respectively; wherein, the front end cover contacts the front oil sprinkler ring, and the rear end cover contacts the rear oil sprinkler ring; wherein, the oil outlet is horizontally arranged on the same side of the rear end cover and the rear oil sprinkler ring opening.

[0021] Preferably, the end cover assembly and the shell are a separate structure or an integrated structure.

[0022] A motor comprises the stator oil channel structure of the oil-cooled motor.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The cooling oil channel and the oil return channel of the utility model are both arranged on the stator core, which simplifies the processing requirements of the casing; at the same time, the dedicated oil return channel on the traditional casing is eliminated, reducing the envelope size of the motor; in addition, there is only one type of stator punching sheet, which facilitates material control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 An exploded view of the overall structure disclosed in an embodiment of the present utility model;

[0026] Figure 2 A cross-sectional view of the oil passage disclosed in an embodiment of the present utility model;

[0027] Figure 3 A schematic structural diagram of a stator assembly disclosed in an embodiment of the present utility model;

[0028] Figure 4 This is a schematic structural diagram of the stator core disclosed in an embodiment of the present utility model;

[0029] Figure 5 This is a schematic structural diagram of the stator punching sheet disclosed in an embodiment of the present utility model.

[0030] In the picture:

[0031] 100, housing;

[0032] 101, oil inlet;

[0033] 110, front cover; 120, rear cover; 121, oil outlet;

[0034] 200, stator assembly;

[0035] 201, oil inlet tank; 202, oil return tank; 203, oil return channel;

[0036] 210, front oil spray ring; 211, front oil spray ring opening; 212, front oil spray ring oil leakage hole;

[0037] 220. Rear oil spray ring; 221. Rear oil spray ring opening; 222. Rear oil spray ring oil leakage hole. DETAILED DESCRIPTION

[0038] In order to make the technical solution and technical effect of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments.

[0039] The utility model aims to provide a stator oil channel structure of an oil-cooled motor, realizing a motor oil cooling structure which can reduce the outer envelope size of the motor and reduce the types of stator punching sheets.

[0040] refer to Figure 1 The motor includes a housing 100 and a stator assembly 200 built into the housing 100. Preferably, the stator assembly 200 is interference fit with the housing 100. The stator assembly 200 includes a stator core formed by stacking stator punching sheets.

[0041] The top of the housing 100 is vertically provided with an oil inlet 101. The two ends of the housing 100 are provided with end cover assemblies supporting the housing 100. The bottom of the end cover assembly is horizontally provided with an oil outlet 121, which is connected to the external circulation oil channel of the motor.

[0042] Preferably, the end cover assembly and the housing 100 are a separate structure or an integrated structure.

[0043] The stator punching is provided with an oil inlet groove 201 and an oil return groove 202, which are overlapped to form an oil inlet staggered oil channel; an oil return channel 203 is provided at the bottom of the stator core. The oil return channel 203 is arranged away from the oil inlet 101.

[0044] For further explanation, see Figure 5 The oil inlet groove 201 is asymmetrically designed with respect to the radial direction of the stator punching sheet; the oil return groove 202 is symmetrically designed with respect to the radial direction of the stator punching sheet; and the oil return oil channel 203 is symmetrically designed with respect to the radial direction of the stator punching sheet.

[0045] In this embodiment, there is only one type of stator punching sheet, which facilitates material control; at the same time, the cooling oil channel and the oil return channel are both provided on the stator core, which simplifies the processing requirements for the housing 100.

[0046] For further explanation, see references 3-4. Opened oil drencher rings surround both ends of the stator assembly 200, forming a closed oil passage with the housing 100. Cooling oil flowing through the oil inlet 101 cools the stator before flowing through the openings in the oil drencher rings, from the return oil passage 203 to the oil outlet 121, and finally to the motor's external oil circulation passage.

[0047] To further explain, the oil sprinkler ring assembly includes a front oil sprinkler ring 210 and a rear oil sprinkler ring 220 , wherein the front oil sprinkler ring 210 and the rear oil sprinkler ring 220 are respectively engaged and fixed on the two ends of the stator assembly 200 .

[0048] To explain further, a front oil sprinkler ring opening 211 and a rear oil sprinkler ring opening 221 are respectively provided at corresponding positions of the front oil sprinkler ring 210 and the rear oil sprinkler ring 220 . The front oil sprinkler ring opening 211 and the rear oil sprinkler ring opening 221 are provided away from the oil inlet 101 .

[0049] To explain further, the front oil sprinkler ring 210 and the rear oil sprinkler ring 220 are also evenly provided with front oil sprinkler ring oil leakage holes 212 and rear oil sprinkler ring oil leakage holes 222 respectively in the circumferential direction. The cooling oil at the oil inlet 101 can be discharged to the oil outlet 121 through the oil inlet staggered oil channel, the front oil sprinkler ring oil leakage holes 212, the rear oil sprinkler ring oil leakage holes 222 and the front oil sprinkler ring opening 211 and the rear oil sprinkler ring opening 221 respectively.

[0050] To further explain, the end cover assembly includes a front cover 110 and a rear cover 120. The front cover 110 contacts the front oil spray ring 210, and the rear cover 120 contacts the rear oil spray ring 220. The rear cover 120 and the rear oil spray ring opening 221 are both horizontally provided with an oil outlet 121.

[0051] When working, refer to Figure 2 The cooling oil enters the stator assembly 200 from the oil inlet 101 at the top of the housing 100, cools the stator core through the stator core circumferentially arranged oil inlet staggered oil channels, and cools the stator core end windings through the front oil drip ring oil leakage holes 212 and the rear oil drip ring oil leakage holes 222; the cooling oil after cooling the stator core flows through the front oil drip ring opening 211, the return oil channel 203 and the rear oil drip ring opening 221 to the oil outlet 121 at the bottom of the housing 100, and leads to the external circulation oil channel of the motor.

[0052] This embodiment eliminates the dedicated oil return passage on the traditional housing 100, and arranges the oil inlet staggered oil passage and the oil return passage 203 in the circumference of the stator core, thereby reducing the envelope size of the motor; at the same time, there is only one type of stator punching sheet, which reduces the types of stator punching sheets and facilitates material control.

[0053] It should be noted that the motor containing the stator oil channel structure provided in this embodiment also falls within the scope of protection of the present utility model.

[0054] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stator oil channel structure for an oil-cooled motor, the motor comprising a housing (100) and a stator assembly (200) built into the housing (100), the stator assembly (200) comprising a stator core formed by stacking stator punching sheets, characterized in that: The housing (100) is provided with an oil inlet (101); both ends of the housing (100) are provided with end cover assemblies, and the end cover assemblies are provided with an oil outlet (121); The stator punching sheet is provided with an oil inlet groove (201) and an oil return groove (202), and the oil inlet groove (201) and the oil return groove (202) are overlapped in both positive and negative directions to form an oil inlet staggered oil channel; An oil-sprinkling ring assembly with an opening is provided around the two ends of the stator assembly (200), and the oil-sprinkling ring assembly and the housing (100) form a closed oil passage; an oil return passage (203) is provided at the bottom of the stator core; after cooling the stator through the cooling oil inlet (101), the cooling oil can pass through the opening of the oil-sprinkling ring assembly from the oil return passage (203) to the oil outlet (121) to the external circulation oil passage of the motor.

2. The stator oil channel structure of the oil-cooled motor according to claim 1, characterized in that: The stator assembly (200) and the housing (100) are interference fit.

3. The stator oil passage structure of the oil-cooled motor according to claim 1, characterized in that: The oil inlet groove (201) is designed asymmetrically with respect to the radial direction of the stator punching sheet; and the oil return groove (202) is designed symmetrically with respect to the radial direction of the stator punching sheet.

4. The stator oil passage structure of the oil-cooled motor according to claim 1, characterized in that: The oil return passage (203) is arranged away from the oil inlet (101), and the oil return passage (203) is designed to be symmetrical with respect to the radial direction of the stator punching sheet.

5. The stator oil passage structure of the oil-cooled motor according to claim 1, characterized in that: The oil spray ring assembly comprises a front oil spray ring (210) and a rear oil spray ring (220), wherein the front oil spray ring (210) and the rear oil spray ring (220) are respectively engaged and fixed on the two ends of the stator assembly (200).

6. The stator oil passage structure of the oil-cooled motor according to claim 5, characterized in that: A front oil sprinkle ring opening (211) and a rear oil sprinkle ring opening (221) are respectively provided at corresponding positions of the front oil sprinkle ring (210) and the rear oil sprinkle ring (220), and the front oil sprinkle ring opening (211) and the rear oil sprinkle ring opening (221) are arranged away from the oil inlet (101).

7. The stator oil passage structure of the oil-cooled motor according to claim 6, characterized in that: The front oil spray ring (210) and the rear oil spray ring (220) are also evenly provided with front oil spray ring oil leakage holes (212) and rear oil spray ring oil leakage holes (222) in the circumferential direction, respectively. The cooling oil of the oil inlet (101) can be discharged to the oil outlet (121) through the front oil spray ring oil leakage holes (212), the rear oil spray ring oil leakage holes (222) and the front oil spray ring opening (211) and the rear oil spray ring opening (221).

8. The stator oil passage structure of the oil-cooled motor according to claim 6, characterized in that: The end cover assembly comprises a front end cover (110) and a rear end cover (120), wherein the front end cover (110) contacts the front oil spray ring (210), and the rear end cover (120) contacts the rear oil spray ring (220); wherein the oil outlet (121) is horizontally arranged on the same side of the rear end cover (120) and the rear oil spray ring opening (221).

9. The stator oil passage structure of the oil-cooled motor according to claim 1, characterized in that: The end cover assembly and the housing (100) are of a separate structure or an integrated structure.

10. A motor, characterized in that: The motor includes the stator oil channel structure of the oil-cooled motor according to any one of claims 1 to 9.

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