High-efficiency oil-cooled motor

Abstract

A high-efficiency oil-cooled motor is disclosed, which includes a housing (1), a front cover (2), a rear cover (3), a stator (4), a rotating shaft (5), and a rotor core (6). The rotating shaft (5) is provided with an axial oil passage (52) and an intermediate radial oil passage (53). The rotor core (6) is provided with a rotor oil passage (61). The front cover (2) is provided with a cooling oil inlet B (21) that communicates with the axial oil passage (52). A water passage (15) is provided in a spiral along the circumference within the side wall of the housing (1). A heat management water supply is provided in the side wall of the housing (1). The cooling oil pipe has a water passage inlet and a water passage outlet connected to the pump, a cooling oil pipe drilled in the water passage (15), a cooling oil inlet A (11) provided in the side wall of the housing (1), and a ring groove oil passage (41) provided in the outer wall of the stator (4), with the cooling oil inlet A (11) passing through the housing (1) between two adjacent water passages (15) and communicating with the ring groove oil passage (41), one end of the cooling oil pipe inserted into the rear cover (3) and communicating with the inside of the housing (1), and the other end of the cooling oil pipe communicating with the cooling oil inlet A (11) and the cooling oil inlet B (21). The rational oil passage distribution design significantly improves the cooling effect of the rotor and stator (4) and enhances the performance of the entire motor.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on October 24, 2022, bearing application number 202211301319.9 and entitled "High-efficiency oil-cooled motor," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of electric vehicle motors, and more particularly to high-efficiency oil-cooled motors. [Background technology]

[0003] Due to the requirements for overall vehicle quality and space, the requirements for power density (torque density) of vehicle drive motors for new energy vehicles are very high, and the increase in speed of vehicle motors has become an inevitable trend recognized by related manufacturers. Interior permanent magnet synchronous motors have become the type of motor of choice for vehicle traction due to their wide rotational speed range and high power density.

[0004] The vehicle drive motor has a high rotational speed requirement, and the maximum rotational speed can generally reach several tens of thousands of revolutions per minute. When the motor operates, various losses that occur are converted into heat, causing each component of the motor to heat up and become hot. The limit of this temperature rise directly affects the service life of the motor, and the harmonic magnetic fields of the stator armature and the rotor magnet steel both generate large eddy current losses in the magnet steel, causing the temperature of the magnet steel to rise. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the above technical problems, an object of the present invention is to provide a highly efficient oil-cooled motor that can cool the rotor more sufficiently. [Means for solving the problem]

[0006] In order to achieve the above object of the invention, the present invention adopts the following technical solutions: That is, the present invention is a high-efficiency oil-cooled motor including a housing, a front cover and a rear cover fixed to both ends of the housing, respectively, a stator provided within the housing, a rotating shaft rotatably disposed at both ends on the front cover and the rear cover via bearings, respectively, and a rotor core provided on the rotating shaft, wherein the rotating shaft is provided with an axial oil passage penetrating the rotating shaft, the rotating shaft is provided with a plurality of intermediate radial oil passages, and the plurality of intermediate radial oil passages communicate with the axial oil passage, the rotor core is provided with a plurality of rotor oil passages extending from the center of the rotor core to both ends and outward, and the rotor oil passages communicate with corresponding intermediate radial oil passages, a cooling oil inlet B is provided in the housing, and the cooling oil inlet B is connected to the axial oil passage; a water passage arranged spirally around the circumference is provided in the side wall of the housing; a water passage inlet and a water passage outlet connected to a thermal management water pump are provided in the side wall of the housing; a cooling oil pipe is drilled in the water passage; a cooling oil inlet A is provided in the side wall of the housing; a ring groove oil passage is provided in the outer wall of the stator; the cooling oil inlet A passes through the housing between two adjacent water passages and communicates with the ring groove oil passage; one end of the cooling oil pipe is inserted into the rear cover and communicates with the inside of the housing; and the other end of the cooling oil pipe is connected to cooling oil inlet A and cooling oil inlet B.

[0007] It is preferable that the number of the intermediate radial oil passages is four, and that the passages are arranged so as to intersect in a cross shape.

[0008] Furthermore, it is preferable that an oil seal is provided between the end of the rotating shaft and the front cover, and that an end radial oil passage is provided at one end of the rotating shaft, and that the end radial oil passage is located between the oil seal and the bearing.

[0009] It is preferable that an arc-surfaced annular groove is provided around the inside of each of the front and rear covers, and the outer end of the rotor oil passage faces the arc-surfaced annular groove.

[0010] It is preferable that a plurality of the ring groove oil passages are arranged in parallel at intervals, and that an axial communication oil passage communicating with the plurality of ring groove oil passages is provided in the outer wall of the stator.

[0011] Furthermore, a cooling oil outlet is provided in the rear cover so as to be close to the outer edge of the rear cover, and the cooling oil pipe includes a cooling oil pipe A segment and a cooling oil pipe B segment. It is preferable that one end of the cooling oil pipe A segment is connected to the cooling oil outlet and the other end is connected to the oil pump, and that the cooling oil pipe B segment is drilled into the water channel, with both ends thereof coming out from the water channel inlet and water channel outlet, respectively, and one end thereof being connected to the oil pump.

[0012] Furthermore, it is preferable that the cooling oil pipe includes a cooling oil pipe C segment, a cooling oil pipe D segment, and a three-way pipe, and that the cooling oil pipe B segment, cooling oil pipe C segment, and cooling oil pipe D segment are connected via the three-way pipe, and that the cooling oil pipe C segment and cooling oil pipe D segment are connected to cooling oil inlet A and cooling oil inlet B, respectively.

[0013] Furthermore, it is preferable that the water channel inlet and water channel outlet are located at the upper and lower parts of the housing outer wall, respectively, and that the water channel inlet communicates with the upper end port of the water channel, and the water channel outlet communicates with the lower end port of the water channel. [Effects of the Invention]

[0014] The beneficial effects of the present invention over the prior art are as follows: In other words, in the present invention, a penetrating oil passage is provided in the rotating shaft, and cooling oil is allocated to flow through each part of the rotor core through multiple radial oil passages, so that the entire rotor core can be cooled and the magnetic steel provided in the rotor core can be indirectly cooled. In addition, a water passage is provided on the outer wall of the housing of the present invention, which cools the cooling oil pipe and improves cooling efficiency, and a cooling oil passage is further provided on the outer wall of the stator of the present invention, which allows the stator to be cooled more quickly. Furthermore, the rational oil passage distribution design of the present invention greatly improves the cooling effect of the rotor and stator, thereby improving the overall performance of the motor. [Brief explanation of the drawings]

[0015] The drawings in the specification, which form a part of this invention, provide an understanding of the invention, and the examples of the invention and the description thereof are intended to be illustrative rather than limiting of the invention.

[0016] [Figure 1] FIG. 1 is an overall view of the present invention from one angle. [Figure 2] FIG. 10 is an overall view of the present invention from another angle. [Figure 3] FIG. 2 is an axial cross-sectional view of the present invention. [Figure 4] FIG. 2 is a radial cross-sectional view of the present invention. [Figure 5] FIG. 2 is a structural diagram of a stator side wall of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The following description will now be used to further explain the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0018] The terms used herein do not limit the embodiments according to the present invention, but are merely used to describe specific embodiments. Unless otherwise clearly indicated in the specification, the singular forms used herein are intended to include the plural forms as well, and when used herein the terms "comprises" and / or "comprises" indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0019] Furthermore, in the description of the present invention, the orientations or positional relationships indicated by terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," "counterclockwise," etc. are orientations or positional relationships according to the drawings, and do not indicate or imply that the indicated devices or elements must have a specific orientation, be constructed in a specific orientation, or be operated in a specific orientation; they are merely intended to conveniently describe the present invention and simplify the description, and do not limit the present invention.

[0020] Furthermore, the terms "first," "second," etc., do not indicate or imply relative importance or the number of technical features indicated, but are merely descriptive. Thus, any feature qualified with "first" or "second" explicitly or implicitly includes one or more of those features. In the description of the present invention, unless otherwise limited, "plurality" means two or more than two.

[0021] In the present invention, unless otherwise expressly specified or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may mean, for example, a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or even internal communication between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0022] In the present invention, unless otherwise expressly specified or limited, a first feature being located "above" or "below" a second feature may include a case where the first feature and the second feature are in direct contact with each other, or a case where the first feature and the second feature are not in direct contact with each other but are in contact with each other through another feature therebetween. Additionally, a first feature being located "above," "above," and "on top of" a second feature includes the first feature being located directly above and diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. A first feature being located "below," "beneath," and "underside" of a second feature includes the first feature being located directly below and diagonally below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0023] The present invention will be further described below in conjunction with the drawings and examples: The high-efficiency oil-cooled motor of Figures 1 to 3 includes a housing 1, a front cover 2 and a rear cover 3 fixed to both ends of the housing 1, a stator 4 provided within the housing 1, a rotating shaft 5 whose both ends are rotatably arranged on the front cover 2 and the rear cover 3 via bearings, and a rotor core 6 provided on the rotating shaft 5. The rotary shaft 5 is provided with an axial oil passage 52 penetrating the rotary shaft 5, and the rotary shaft 5 is provided with a plurality of intermediate radial oil passages 53. Furthermore, the plurality of intermediate radial oil passages 53 communicate with the axial oil passage 52, and the number of the intermediate radial oil passages 53 is four, and they are arranged so as to intersect in a cross shape. The rotor core 6 is provided with a plurality of rotor oil passages 61 extending from the center of the rotor core 6 to both ends and outward. The rotor oil passage 61 communicates with the corresponding intermediate radial oil passage 53 , and the front cover 2 is provided with a cooling oil inlet B 21 , which communicates with the axial oil passage 52 .

[0024] An arc-surface annular groove 32 is formed around the circumference on the inner side of the front cover 2 and the rear cover 3 , and the outer end of the rotor oil passage 61 faces the arc-surface annular groove 32 . The cooling oil splashed from the rotor oil passage 61 is guided by the arc-surface annular groove 32 and splashed onto the ends of the windings, thereby providing a certain level of cooling effect to the ends of the windings as well.

[0025] Furthermore, as shown in Figure 3, a water channel 15 is provided in the side wall of the housing 1 and is arranged spirally around the circumference, and a water channel inlet and a water channel outlet connected to a thermal management water pump are provided in the side wall of the housing 1, and a cooling oil pipe is drilled in the water channel 15. As shown in FIGS. 4 and 5, a cooling oil inlet A11 is provided in the side wall of the housing 1, and a ring groove oil passage 41 is provided in the outer wall of the stator 4. The cooling oil inlet A11 passes through the housing 1 between two adjacent water passages 15 and then communicates with the ring groove oil passage 41, one end of the cooling oil pipe is inserted into the rear cover 3 and then communicates with the inside of the housing 1, and the other end of the cooling oil pipe communicates with the cooling oil inlet A11 and the cooling oil inlet B21.

[0026] The specific arrangement structure of the cooling oil pipe is as follows: the rear cover 3 is further provided with a cooling oil outlet 31 close to the outer edge of the rear cover 3, and the cooling oil pipe includes a cooling oil pipe A segment 101 and a cooling oil pipe B segment 102. One end of the cooling oil pipe A segment 101 is connected to the cooling oil outlet 31 and the other end is connected to the oil pump 100, and the cooling oil pipe B segment 102 is drilled into the water passage 15, with both ends coming out from the water passage inlet and water passage outlet, respectively, and one end of the cooling oil pipe B segment 102 being connected to the oil pump 100.

[0027] The cooling oil pipe further includes a cooling oil pipe C segment 103 , a cooling oil pipe D segment 104 and a three-way pipe 105 . The cooling oil pipe B segment 102, cooling oil pipe C segment 103, and cooling oil pipe D segment 104 are connected via a three-way pipe 105, and the cooling oil pipe C segment 103 and the cooling oil pipe D segment 104 are connected to the cooling oil inlet A11 and the cooling oil inlet B21, respectively.

[0028] By the action of the oil pump 100, the cooling oil discharged from the motor re-enters the water passage 11 in the side wall of the housing 1, where it is subjected to accelerated cooling before entering the rotating shaft 5 and the stator 4. The stator 4 has multiple ring groove oil passages 41 arranged in parallel at intervals, and as shown in Figure 5, the outer wall of the stator 4 is provided with an axial communication oil passage 42 that communicates with the multiple ring groove oil passages 41. Here, the oil passages sufficiently cool the stator 4 and indirectly cool the windings in the stator 4, thereby improving the heat dissipation capacity of the motor.

[0029] The water channel inlet and water channel outlet are located at the upper and lower parts of the housing outer wall, respectively. The water channel inlet communicates with the upper end of the water channel 15, and the water channel outlet communicates with the lower end of the water channel 15. With the above structure, the water flows from top to bottom along the water channel 15, and the cooling oil flows from bottom to top due to the action of the oil pump 100. By arranging them opposite to each other, the water flow can more quickly remove heat from the oil pipe, improving cooling efficiency. In other embodiments, the cooling oil pipe and the water channel 15 may be arranged in the same direction.

[0030] An oil seal 7 is further provided between the end of the rotating shaft 5 and the front cover 2, and an end radial oil passage 51 is further provided at one end of the rotating shaft 5, and the end radial oil passage 51 is located between the oil seal 7 and the bearing. By arranging the oil seal 7, it is possible to ensure that the cooling oil does not easily leak even when the motor rotor rotates at high speed, and by arranging the radial oil passages 51, the cooling oil flows through the bearing and exerts a lubricating effect on the bearing, and there are four end radial oil passages 51, which are arranged to intersect in a cross shape. The end radial oil passages 51, the intermediate radial oil passages 53 and the rotor oil passages 61 are arranged evenly and symmetrically, and do not affect the dynamic balance of the rotor.

[0031] In the description of this specification, references to "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0032] The above describes embodiments of the present invention, but the above embodiments are merely illustrative, and changes, amendments, substitutions, and modifications can be made to the above embodiments within the scope of the present invention without departing from the scope of the present invention, and all of these fall within the scope of the present invention. [Explanation of symbols]

[0033] 1. Housing 11...Cooling oil inlet A 15 Waterway 2 Front cover 21...Cooling oil inlet B 3 Rear cover 31...Cooling oil outlet 32...Arc surface annular groove 4. Stator 40 Stator core 41 Ring groove oil passage 42 ...Axial communication oil path 43 Winding 5. Rotation axis 51...End radial oil passage 52 ...Axial oil path 53 ...Middle radial oil passage 6 Rotor core 61 Rotor oil passage 7 Oil seal 100 ···Oil pump 101 Cooling oil pipe A segment 102 Cooling oil pipe B segment 103 Cooling oil pipe C segment 104 Cooling oil pipe D segment 105...Three-way tube

Claims

1. A high-efficiency oil-cooled motor including a housing (1), a front cover (2) and a rear cover (3) fixed to both ends of the housing (1), a stator (4) provided within the housing (1), a rotating shaft (5) rotatably disposed at both ends on the front cover (2) and the rear cover (3) via bearings, and a rotor core (6) provided on the rotating shaft (5), The rotating shaft (5) is provided with an axial oil passage (52) penetrating the rotating shaft (5) and a plurality of intermediate radial oil passages (53), The plurality of intermediate radial oil passages (53) communicate with the axial oil passage (52), The rotor core (6) is provided with a plurality of rotor oil passages (61) extending from the center of the rotor core (6) to both ends and to the outside, The rotor oil passage (61) communicates with the corresponding intermediate radial oil passage (53), The front cover (2) is provided with a cooling oil inlet B (21), The cooling oil inlet B (21) communicates with the axial oil passage (52), A water channel (15) is provided in the side wall of the housing (1) and is arranged spirally along the circumference; The side wall of the housing (1) is provided with a water channel inlet and a water channel outlet connected to a thermal management water pump; A cooling oil pipe is drilled in the water channel (15), A cooling oil inlet A (11) is provided on the side wall of the housing (1), A ring groove oil passage (41) is provided on the outer wall of the stator (4), The cooling oil inlet A (11) passes through the housing (1) between two adjacent water passages (15) and communicates with the ring groove oil passage (41), One end of the cooling oil pipe is inserted into the rear cover (3) and communicates with the inside of the housing (1); The other end of the cooling oil pipe is connected to the cooling oil inlet A (11) and the cooling oil inlet B (21).

2. 2. The high-efficiency oil-cooled motor according to claim 1, wherein the number of the intermediate radial oil passages (53) is four, and the intermediate radial oil passages (53) are arranged so as to intersect in a cross shape.

3. An oil seal (7) is provided between the end of the rotary shaft (5) and the front cover (2), The end radial oil passage (51) is provided at one end of the rotating shaft (5), 2. The high-efficiency oil-cooled motor according to claim 1, wherein the end radial oil passage (51) is located between the oil seal (7) and the bearing.

4. An arc-shaped annular groove (32) is provided on the inside of the front cover (2) and the rear cover (3), 2. The high-efficiency oil-cooled motor according to claim 1, wherein an outer end of the rotor oil passage (61) faces the arc-surface annular groove (32).

5. The ring groove oil passages (41) are plural and arranged in parallel at intervals, 2. The oil-cooled motor according to claim 1, wherein an axially communicating oil passage (42) communicating with the plurality of ring groove oil passages (41) is provided in the outer wall of the stator (4).

6. The rear cover (3) is provided with a cooling oil outlet (31) close to the outer edge of the rear cover (3), The cooling oil pipe includes a cooling oil pipe A segment (101) and a cooling oil pipe B segment (102), One end of the cooling oil pipe A segment (101) is connected to the cooling oil outlet (31), and the other end is connected to the oil pump (100).

2. A high-efficiency oil-cooled motor according to claim 1, wherein the cooling oil pipe B segment (102) is drilled in the water channel (15), both ends of the cooling oil pipe B segment extend from the water channel inlet and the water channel outlet, respectively, and one end of the cooling oil pipe B segment is connected to the oil pump (100).

7. The cooling oil pipe further includes a cooling oil pipe C segment (103), a cooling oil pipe D segment (104), and a three-way pipe (105); The cooling oil pipe B segment (102), the cooling oil pipe C segment (103), and the cooling oil pipe D segment (104) are in communication with each other via the three-way pipe (105), 7. A high-efficiency oil-cooled motor according to claim 6, wherein the cooling oil pipe C segment (103) and the cooling oil pipe D segment (104) are connected to the cooling oil inlet A (11) and the cooling oil inlet B (21), respectively.

8. The water channel inlet and the water channel outlet are located at the upper and lower parts of the housing outer wall, respectively; The water channel inlet communicates with the upper end of the water channel (11); 2. The oil-cooled motor housing with integrated heat exchanger according to claim 1, wherein the water passage inlet is connected to a lower end port of the water passage (11).

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