Oil-cooled motor using oil-lubricated bearings

Abstract

The present invention relates to an oil-cooled motor using oil-lubricated bearings, comprising a housing, a stator and a rotor, an oil seal is further provided between the rotating shaft and the housing, a cavity is formed between the oil seal and the bearing, a top oil collecting box is provided on the side wall of the housing, a winding end cooling oil channel connected to the top oil collecting box is further provided in the housing, a stator cooling oil channel is further provided on the side wall of the stator, and the stator cooling oil channel is connected to the top oil collecting box, a lubricating oil channel connecting the top oil collecting box and the cavity is further provided in the housing, an oil guide baffle plate A and an oil guide baffle plate B extending toward the two end faces of the rotor core are further provided at both ends of the housing, an axially penetrating rotor oil throwing hole is further provided on the rotor core, one end of the rotor oil throwing hole is provided in the oil guide baffle plate A, and the other end is provided outside the oil guide baffle plate B. The present invention can cool all parts in the motor; at the same time, it can improve the working state of the bearing, reduce the risk of oil film rupture, and extend the service life of the bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors for electric vehicles, and more particularly to an oil-cooled motor using an oil-lubricated bearing. Background Art

[0002] New energy drive motors are currently tending towards high torque power output, high speed, and compact structure. When the motor is running at high speed, the increase in internal heat will seriously affect the electromagnetic performance and service life of the motor. At present, the commonly used motor cooling forms on the market are air cooling, water cooling, and oil cooling. With the development of permanent magnet synchronous motors and the increase in power density, oil cooling has become a common choice for motor cooling. At the same time, the lubrication of bearings also requires cooling oil. In the prior art, in order to lubricate the bearings of oil-cooled motors, oil holes are usually opened axially on the surface of the rotor shaft. The lubrication effect of this lubrication structure is limited by the speed of the rotor. The existing oil-cooled motor bearing lubrication structure is difficult to achieve stable and reliable bearing lubrication, resulting in insufficient bearing lubrication, affecting the service life of the bearing and causing safety hazards. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an oil-cooled motor using oil-lubricated bearings, which is easy to process as a whole, has good cooling effect and a longer service life of the bearings.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] An oil-cooled motor using oil-lubricated bearings comprises a casing, a stator and a rotor, the rotor comprising a rotor core and a rotating shaft, the two ends of the rotating shaft being rotatably arranged on the casing respectively through bearings, an oil seal being arranged between the rotating shaft and the casing, a cavity being formed between the oil seal and the bearing, a top oil collecting box being arranged on the side wall of the casing, a winding end cooling oil passage being connected to the top oil collecting box being arranged in the casing, a stator cooling oil passage being arranged on the side wall of the stator, and the stator cooling oil passage being connected to the top oil collecting box, a lubricating oil passage connecting the top oil collecting box and the cavity being arranged in the casing, an oil guide baffle plate A and an oil guide baffle plate B extending toward the two end surfaces of the rotor core being arranged at the two ends of the casing respectively, an axially penetrating rotor oil throwing hole being arranged on the rotor core, one end of the rotor oil throwing hole being arranged in the oil guide baffle plate A, and the other end being arranged outside the oil guide baffle plate B.

[0006] As a preferred solution: the rotor has multiple oil-swing holes, including an oil inlet hole close to the outer wall of the rotor and an oil outlet hole close to the center of the rotor.

[0007] As a preferred solution: the two ends of the casing are respectively a front cover and a rear cover, the oil guide baffle plate A and the oil guide baffle plate B are respectively arranged on the inner sides of the front cover and the rear cover, and the oil guide baffle plate A and the oil guide baffle plate B separate the oil inlet hole and the oil outlet hole.

[0008] As a preferred solution: there are four oil inlet holes and four oil outlet holes, which are evenly spaced on the rotor core.

[0009] As a preferred solution: the lubricating oil passage is an oil passage A that runs through the connection between the end surface of the front end cover and the oil guide baffle plate A; and an oil passage B that runs through the connection between the end surface of the rear end cover and the oil guide baffle plate B.

[0010] As a preferred solution: the oil guide baffle plate A and the oil guide baffle plate B are both in the shape of a hollow truncated cone.

[0011] As a preferred solution: the stator cooling oil channel is a groove surrounding the outer side wall of the stator, and a plurality of stator cooling oil channels are arranged in parallel at intervals.

[0012] As a preferred solution: the winding end cooling oil channel includes arc-shaped distribution oil channels arranged at both ends in the casing and along the circumference of the casing, and the arc-shaped distribution oil channel is connected to a plurality of radial oil injection channels extending toward the rotating shaft at equal intervals.

[0013] As a preferred solution: baffles are further provided at both ends of the rotor core, and the rotor oil-swinging hole passes through the baffles.

[0014] As a preferred solution: one end of the casing is further provided with a cooling oil outlet communicating with the inside and outside of the casing, and a bottom oil collecting tank is further provided inside the casing.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention arranges a top oil collecting box outside the casing, and arranges a plurality of pipelines inside the casing to guide the cooling oil to the winding end, the stator core, the bearing and the rotor respectively, so that each part can be cooled; at the same time, after the cooling oil flows through the bearing, it can also lubricate the bearing oil, improve the working condition of the bearing, reduce the risk of oil film rupture of the bearing, and extend the service life of the bearing; at the same time, an oil throwing hole is also arranged in the rotor, which can further cool the rotor, and through the restriction of the oil guide baffle plate A and the oil guide baffle plate B at both ends, the oil throwing range of the rotor can be reduced, the collision between the cooling oil and the stator is reduced as much as possible, and the emulsification risk is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0018] Figure 1 It is a schematic diagram of the axial cross-sectional structure of the motor of the present invention;

[0019] Figure 2 The structural diagram of the rear end cover of the present invention is

[0020] Figure 3 It is a schematic structural diagram of the rotor core of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the front end cover of the present invention;

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the casing of the present invention;

[0023] Figure 6 It is a schematic diagram of the radial cross-sectional structure of the motor end of the present invention;

[0024] Figure 7 It is a schematic diagram of the radial cross-sectional structure of the middle part of the motor of the present invention.

[0025] The accompanying drawings are marked as follows: 1. casing; 2. stator; 11. stator cooling oil channel; 12. rotor oil-slinging hole; 3. rotor core; 31. baffle; 32. oil inlet hole; 33. oil outlet hole; 4. rotating shaft; 5. front end cover; 6. rear end cover; 51. oil guide baffle plate A; 52. oil channel A; 61. oil guide baffle plate B; 62. oil channel B; 7. bearing; 8. oil seal; 9. top oil collecting box; 10. winding end cooling oil channel; 13. cooling oil outlet; 14. arc-shaped distribution oil channel; 15. radial oil injection channel; 16. bottom oil collecting tank. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] In addition, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0033] like Figure 1 and Figure 2The oil-cooled motor with oil-lubricated bearings shown in the figure comprises a housing 1, a stator 2 and a rotor, wherein the rotor comprises a rotor core 3 and a shaft 4, wherein both ends of the shaft 4 are rotatably arranged on the housing 1 through bearings 7, and an oil seal 8 is arranged between the shaft 4 and the housing 1, wherein a cavity is formed between the oil seal 8 and the bearing 7, a top oil collecting box 9 is arranged on the side wall of the housing 1, and a winding end cooling oil channel 10 connected to the top oil collecting box 9 is arranged in the housing 1, and a A stator cooling oil channel 11 is provided, and the stator cooling oil channel is communicated with the top oil collecting box 9. A lubricating oil channel connecting the top oil collecting box 9 and the cavity is also provided in the casing 1. An oil guide baffle plate A51 and an oil guide baffle plate B61 extending toward the two end surfaces of the rotor core 3 are respectively provided at both ends of the casing 1. An axially penetrating rotor oil-swinging hole 12 is also provided on the rotor core 3. One end of the rotor oil-swinging hole 12 is arranged in the oil guide baffle plate A51, and the other end is arranged outside the oil guide baffle plate B61.

[0034] The top oil collecting box design in this embodiment makes it possible for the cooling oil to circulate in the motor without pressurizing the cooling oil, by utilizing gravity flow. At the same time, the cooling oil flows through the bearings to lubricate the bearing oil, improve the bearing working condition, and reduce the risk of oil film rupture in the bearings.

[0035] like Figure 3 and Figure 6 As shown, the rotor oil-slinging holes 12 are multiple, including an oil inlet hole 32 near the outer wall of the rotor and an oil outlet hole 33 near the center of the rotor. Baffles 31 are also provided at both ends of the rotor core 3, and the rotor oil-slinging holes 12 penetrate the baffles 31.

[0036] like Figure 2 , Figure 4 and Figure 7 As shown, the two ends of the housing 1 are respectively a front cover 5 and a rear cover 6, the oil guide baffle plate A51 and the oil guide baffle plate B61 are respectively arranged on the inner side of the front cover 5 and the rear cover 6, and the oil guide baffle plate A51 and the oil guide baffle plate B61 separate the oil inlet hole 32 and the oil outlet hole 33. Preferably, there are 4 oil inlet holes 32 and 4 oil outlet holes 33, and they are evenly spaced and arranged on the rotor core 3, so that the arrangement is more conducive to the dynamic balance of the rotor.

[0037] The lubricating oil passage is an oil passage A52 that runs through the connection between the end surface of the front end cover 5 and the oil guide baffle plate A51, and an oil passage B62 that runs through the connection between the end surface of the rear end cover 6 and the oil guide baffle plate B61. The oil guide baffle plate A51 and the oil guide baffle plate B61 are both hollow truncated cones.

[0038] The rotor core is provided with rotor oil-swinging holes 12, so that the cooling oil can enter directly from both ends of the rotor without passing through the rotating shaft, eliminating the processing of the hollow shaft and realizing rotor cooling at the same time. Combined with the restrictions of the oil guide baffle plate A51 and the oil guide baffle plate B61 on the front and rear end covers, the rotor oil-swinging range is reduced, less cooling oil collides with the stator, which helps to reduce the risk of emulsification.

[0039] The stator cooling oil channel 11 is a groove surrounding the outer wall of the stator, and multiple stator cooling oil channels 11 are arranged in parallel at intervals. Figure 5 As shown, the winding end cooling oil channel 10 includes arc-shaped distribution oil channels 14 arranged at both ends in the casing 1 and along the circumference of the casing 1 , and the arc-shaped distribution oil channel 14 is connected to a plurality of radial oil injection channels 15 extending toward the rotating shaft 4 at equal intervals.

[0040] One end of the housing 1 is also provided with a cooling oil outlet 13 communicating with the inside and outside of the housing 1, and the housing is also provided with a bottom oil collecting tank 16. Thanks to the cooling oil outlet position and the bottom oil collecting tank, part of the stator is immersed in oil, which can further improve the cooling effect.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0042] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An oil-cooled motor using oil-lubricated bearings, comprising a housing (1), a stator (2) and a rotor, the rotor comprising a rotor core (3) and a rotating shaft (4), both ends of the rotating shaft (4) being rotatably arranged on the housing (1) via bearings (7), and an oil seal (8) being arranged between the rotating shaft (4) and the housing (1), a cavity being formed between the oil seal (8) and the bearing (7), characterized in that: A top oil collecting box (9) is provided on the side wall of the casing (1), a winding end cooling oil passage (10) communicating with the top oil collecting box (9) is also provided in the casing (1), a stator cooling oil passage (11) is also provided on the side wall of the stator (2), and the stator cooling oil passage is communicated with the top oil collecting box (9), a lubricating oil passage connecting the top oil collecting box (9) and the cavity is also provided in the casing (1), an oil guide baffle plate A (51) and an oil guide baffle plate B (61) extending toward two end surfaces of the rotor core (3) are respectively provided at both ends of the casing (1), and a rotor oil throwing hole (12) penetrating axially is also provided on the rotor core (3), one end of the rotor oil throwing hole (12) is provided in the oil guide baffle plate A (51), and the other end is provided outside the oil guide baffle plate B (61); The rotor oil-slinging holes (12) are multiple, including an oil inlet hole (32) close to the outer wall of the rotor and an oil outlet hole (33) close to the center of the rotor; Baffles (31) are also provided at both ends of the rotor iron core (3), and the rotor oil-swinging hole (12) passes through the baffles (31).

2. The oil-cooled motor using oil-lubricated bearings according to claim 1, characterized in that: The two ends of the housing (1) are respectively a front cover (5) and a rear cover (6); the oil guide baffle plate A (51) and the oil guide baffle plate B (61) are respectively arranged on the inner sides of the front cover (5) and the rear cover (6); and the oil guide baffle plate A (51) and the oil guide baffle plate B (61) separate the oil inlet hole (32) and the oil outlet hole (33).

3. The oil-cooled motor using oil-lubricated bearings according to claim 1, characterized in that: There are four oil inlet holes (32) and four oil outlet holes (33), which are evenly spaced and arranged on the rotor core (3).

4. The oil-cooled motor using oil-lubricated bearings according to claim 1, characterized in that: The lubricating oil passage is an oil passage A (52) penetrating the connection between the end surface of the front end cover (5) and the oil guide baffle plate A (51); and an oil passage B (62) penetrating the connection between the end surface of the rear end cover (6) and the oil guide baffle plate B (61).

5. The oil-cooled motor using oil-lubricated bearings according to claim 1, characterized in that: The oil guide baffle plate A (51) and the oil guide baffle plate B (61) are both in the shape of a hollow truncated cone.

6. The oil-cooled motor using oil-lubricated bearings according to claim 1, characterized in that: The stator cooling oil channel (11) is a groove surrounding the outer wall of the stator, and a plurality of stator cooling oil channels (11) are arranged in parallel at intervals.

7. The oil-cooled motor using oil-lubricated bearings according to claim 1, characterized in that: The winding end cooling oil channel (10) comprises arc-shaped distribution oil channels (14) arranged at two ends in the casing (1) and arranged along the circumference of the casing (1), and the arc-shaped distribution oil channel (14) is connected to a plurality of radial oil injection channels (15) extending toward the rotating shaft (4) at equal intervals.

8. The oil-cooled motor using oil-lubricated bearings according to claim 1, characterized in that: One end of the casing (1) is also provided with a cooling oil outlet (13) communicating with the inside and outside of the casing (1), and a bottom oil collecting tank (16) is also provided inside the casing.

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