Rotating shaft with cooling oil path structure, rotor and motor

Abstract

The utility model relates to the technical field of oil cooling motors, in particular to a rotating shaft with a cooling oil path structure, a rotor and a motor, the radial surface of the rotating shaft is provided with an oil inlet hole, the rotating shaft is also provided with an oil outlet hole, and an axial flow channel communicated with the oil inlet hole and the oil outlet hole is formed in the rotating shaft; cooling oil can enter the axial flow channel from the oil inlet hole and is thrown out from the oil outlet hole under the action of centrifugal force. According to the rotating shaft with the cooling oil path structure, the rotor and the motor provided by the utility model, the oil inlet hole is formed in the radial surface of the rotating shaft, and compared with the prior art, the length of the whole oil path is shortened, the flow resistance is reduced, the structure is simplified, and the axial length of the motor is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil cooling motor technical field, concretely relates to a rotating shaft, a rotor and a motor with cooling oil circuit structure. BACKGROUND

[0002] With the promotion of motor to high efficiency, high power density target, the temperature rise challenge of motor gradually aggravates, and the effect of improving motor cooling system becomes the key to improve motor power density. Oil cooling motor is a kind of motor that uses cooling oil as cooling medium to reduce operating temperature. Compared with traditional air-cooled motor, oil cooling motor has good heat dissipation effect, low noise and low failure rate, and shows unique advantages, and is widely used in many fields.

[0003] At present, part of oil cooling motor adopts rotor cooling, that is, cooling oil enters from the end face of the rotating shaft, and then is thrown out to the stator winding through centrifugal force, so as to cool the stator winding and the rotor. However, in the existing cooling oil circuit structure, the cooling oil enters from the axial end face of the rotating shaft, and an oil inlet structure needs to be designed on the axial end face of the rotating shaft. Moreover, the cooling oil enters the motor end cover from the motor shell, and then enters the oil inlet cover, and then flows into the rotating shaft of the motor. The long oil channel increases the flow resistance. Moreover, the structure is complex, which also increases the axial length of the motor. UTILITY MODEL CONTENT

[0004] The utility model discloses a rotating shaft, a rotor and a motor with cooling oil circuit structure to solve the technical problem of long oil channel, large flow resistance, complex structure and increased axial length of motor in the prior art. An oil inlet hole is formed in the radial surface of the rotating shaft, the overall oil channel length is shortened, the flow resistance is reduced, the structure is simplified, and the axial length of the motor is also reduced.

[0005] The technical scheme of the utility model comprises the following:

[0006] A rotating shaft with a cooling oil circuit structure, an oil inlet hole is formed in the radial surface of the rotating shaft, an oil outlet hole is further formed on the rotating shaft, and an axial flow channel is formed in the rotating shaft to communicate the oil inlet hole and the oil outlet hole. Cooling oil can enter the axial flow channel from the oil inlet hole and be thrown out from the oil outlet hole under the action of centrifugal force.

[0007] Further, at least one group of oil inlet holes is arranged on the rotating shaft, and the number of each group of oil inlet holes is one or more. When the number of each group of oil inlet holes is more than one, the plurality of oil inlet holes are arranged in a circumferential interval.

[0008] Further, the oil outlet hole is formed in the radial surface of the rotating shaft, and at least one group of oil outlet holes is arranged on the rotating shaft, and the number of each group of oil outlet holes is one or more. When the number of each group of oil outlet holes is more than one, the plurality of oil outlet holes are arranged in a circumferential interval.

[0009] Further, the rotating shaft comprises a first side shaft and a second side shaft, the first side shaft has a first opening facing the second side shaft, the second side shaft has a second opening facing the first side shaft, and the first side shaft and the second side shaft are coaxially connected.

[0010] Further, the oil inlet holes are arranged on the first side shaft, the oil outlet holes are arranged in two groups, the rotating shaft further comprises an oil distribution shaft, a first end of the oil distribution shaft is communicated with the first opening on the first side shaft, a second end of the oil distribution shaft extends into the second side shaft, the second end of the oil distribution shaft is provided with an oil distribution hole in a radial direction, and the oil distribution hole is located at a middle position between the two groups of oil outlet holes.

[0011] In another aspect of the utility model, a rotor is provided, comprising the rotating shaft as any one of the above.

[0012] Further, the rotor comprises a dynamic balance plate, the dynamic balance plate is provided with an oil throwing hole, one end of the oil throwing hole is communicated with the oil outlet hole, and the other end of the oil throwing hole faces a stator winding of a stator matched with the rotor.

[0013] In another aspect of the utility model, a rotor is provided, comprising the rotating shaft as any one of the above.

[0014] Further, the motor further comprises a shell and a stator, the shell is provided with an oil inlet flow channel, one end of the oil inlet flow channel is formed into an oil inlet port, the other end of the oil inlet flow channel is matched with a radial rotating surface of the rotating shaft provided with the oil inlet hole in a gap mode, cooling oil enters the oil inlet flow channel from the oil inlet port, enters an axial flow channel in the rotating shaft from the oil inlet hole on the rotating shaft, and is directly or indirectly thrown to the stator winding of the stator under the action of centrifugal force from the oil outlet hole.

[0015] Further, the gap matching part between the shell and the rotating shaft is sealed on the outer side in the axial direction.

[0016] After the above technical scheme is adopted, compared with the prior art, the rotating shaft, the rotor and the motor with the cooling oil channel structure provided by the utility model have the following beneficial effects: the oil inlet hole is arranged on the radial surface of the rotating shaft, and the cooling oil can directly enter from the radial surface of the rotating shaft, compared with the prior art, the overall oil channel length is shortened, the flow resistance is reduced, the structure is simpler, and the cooling oil does not need to enter the rotating shaft from the oil inlet cover and the axial end face of the motor, and the axial length of the motor is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A cross-sectional view of a motor provided by the utility model embodiment one

[0018] Figure 2 A cross-sectional view of a motor is provided for the second embodiment of the present application.

[0019] Wherein,

[0020] Shaft 1, oil inlet hole 11, oil outlet hole 12, axial flow channel 13, first side shaft 14, second side shaft 15, oil distribution shaft 16, oil distribution hole 161; dynamic balance plate 21, oil throwing hole 211; stator winding 31; front end cover 41, middle casing 42, rear end cover 43, oil inlet 44, oil inlet flow channel 45; bearing 51, oil seal 52. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0023] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0024] In addition, it should be noted that the use of the terms "first", "second" and the like to limit parts only facilitates the differentiation of the corresponding parts, and the above terms have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0025] Embodiment one:

[0026] As Figure 1 shown, the embodiment provides a rotating shaft 1 of an oil-cooled motor, which has a cooling oil path structure and can realize cooling of a motor rotor and a stator winding 31. Specifically, the rotating shaft 1 has an oil inlet hole 11 formed on a radial surface thereof near one end thereof, oil outlet holes 12 formed on the radial surface thereof near a middle position thereof, and an axial flow channel 13 formed in the rotating shaft 1. An outer end of the oil inlet hole 11 is in communication with the outside of the rotating shaft 1 for oil inlet, and an inner end of the oil inlet hole 11 is in communication with the axial flow channel 13. Inner ends of the oil outlet holes 12 are in communication with the axial flow channel 13, and outer ends of the oil outlet holes 12 are in communication with the outside of the rotating shaft 1 for oil outlet, thereby forming the cooling oil path structure.

[0027] When the motor needs to be cooled, cooling oil can enter the axial flow channel 13 from the outer end of the oil inlet hole 11 and be thrown out of the oil outlet holes 12 under the action of centrifugal force, and can be thrown to components in the motor that need to be cooled, such as the stator winding 31.

[0028] Thus, the rotating shaft 1 with the cooling structure provided by the embodiment has the oil inlet hole 11 formed on the radial surface of the rotating shaft 1, and cooling oil can directly enter from the radial surface of the rotating shaft 1. Compared with the prior art, the overall oil path length is shortened, the flow resistance is reduced, the structure is simpler, and the cooling oil does not need to enter the rotating shaft 1 from the oil inlet cover of the motor and the axial end surface, thereby reducing the axial length of the motor.

[0029] As Figure 1 shown, the embodiment provides a rotating shaft 1 of an oil-cooled motor, which has a cooling oil path structure and can realize cooling of a motor rotor and a stator winding 31. Specifically, the rotating shaft 1 has an oil inlet hole 11 formed on a radial surface thereof near one end thereof, oil outlet holes 12 formed on the radial surface thereof near a middle position thereof, and an axial flow channel 13 formed in the rotating shaft 1. An outer end of the oil inlet hole 11 is in communication with the outside of the rotating shaft 1 for oil inlet, and an inner end of the oil inlet hole 11 is in communication with the axial flow channel 13. Inner ends of the oil outlet holes 12 are in communication with the axial flow channel 13, and outer ends of the oil outlet holes 12 are in communication with the outside of the rotating shaft 1 for oil outlet, thereby forming the cooling oil path structure.

[0030] Further, the embodiment is provided with two groups of oil outlet holes 12 on the rotating shaft 1, which are arranged on the front and back sides near the middle part of the rotating shaft 1 and preferably on the radial surface of the rotating shaft 1 to directly throw the cooling oil to the stator windings 31 at the two ends of the stator. The number of each group of oil outlet holes 12 can be set as required, for example, one or more, and when the number of each group of oil outlet holes 12 is more than one, the multiple oil outlet holes 12 are arranged in the circumferential direction and preferably uniformly spaced.

[0031] The rotating shaft 1 of the embodiment includes a first side shaft 14 and a second side shaft 15. The first side shaft 14 has a first opening, and the second side shaft 15 has a second opening. The first side shaft 14 and the second side shaft 15 are coaxially connected by threaded connection, welding or interference press fitting, etc. During the installation and connection, the first opening of the first side shaft 14 faces the second side shaft 15, and the second opening of the second side shaft 15 faces the first side shaft 14. Since the oil inlet hole 11 and the oil outlet hole 12 are arranged on the radial surface of the rotating shaft 1, and the axial end surface is closed, the rotating shaft 1 is designed as a split type, which facilitates the machining of the first side shaft 14 and the second side shaft 15 to form the axial flow channel 13.

[0032] Further, the embodiment is provided with two groups of oil outlet holes 12 on the rotating shaft 1, which are arranged on the front and back sides near the middle part of the rotating shaft 1 and preferably on the radial surface of the rotating shaft 1 to directly throw the cooling oil to the stator windings 31 at the two ends of the stator. The number of each group of oil outlet holes 12 can be set as required, for example, one or more, and when the number of each group of oil outlet holes 12 is more than one, the multiple oil outlet holes 12 are arranged in the circumferential direction and preferably uniformly spaced.

[0033] Further, the rotating shaft 1 also includes a oil distribution shaft 16. The first end of the oil distribution shaft 16 is connected to the first side shaft 14 by threaded connection, etc., and the opening of the first end of the oil distribution shaft 16 is in communication with the first opening of the first side shaft 14. The second end of the oil distribution shaft 16 extends into the second side shaft 15, and a oil distribution hole 161 is arranged on the second end of the oil distribution shaft 16 in the radial direction. The oil distribution hole 161 is located at the middle position between the two groups of oil outlet holes 12. The number of oil distribution holes 161 can be set as required, for example, one or more, and when the number of oil distribution holes 161 is more than one, the multiple oil distribution holes 161 are arranged in the circumferential direction and preferably uniformly spaced.

[0034] Therefore, the embodiment sets the oil distribution shaft 16, so that the cooling oil can flow to the middle position of the two groups of oil outlet holes 12 in the oil distribution shaft 16, and then be thrown out to the inner wall of the second side shaft 15 from the oil distribution hole 161 under the centrifugal force generated by the rotation of the rotating shaft 1, and then continue to move to the front and rear groups of oil outlet holes 12 along the inner wall of the second side shaft 15 under the centrifugal force, so that the cooling oil distributed at the two groups of oil outlet holes 12 is more uniform, the heat dissipation of the stator winding 31 at both ends of the stator is more uniform, and the overall heat dissipation effect is improved.

[0035] In addition, the embodiment also provides a rotor, which comprises the rotating shaft 1 as described above, and further comprises a rotor core, a dynamic balance plate and the like to cooperate with the stator to realize rotation.

[0036] In addition, the embodiment also provides a motor, which comprises the rotor as described above. The motor further comprises a stator, which comprises a stator core and a stator winding 31, and is correspondingly arranged on the radial outer side of the rotor.

[0037] Further, the motor further comprises a housing, which comprises a front end cover 41, a middle housing 42 and a rear end cover 43, and the middle housing 42 and the rear end cover 43 are formed with an oil inlet flow channel 45, one end of the oil inlet flow channel 45 is formed as an oil inlet port 44, and the other end of the oil inlet flow channel 45 is in gap cooperation with the radial rotation surface of the rotating shaft 1 provided with the oil inlet hole 11, preferably small gap cooperation. Of course, in other embodiments, the oil inlet flow channel 45 can be arranged only on the rear end cover 43, and the oil inlet port 44 is also formed on the rear end cover 43.

[0038] When the motor needs to be cooled, the cooling oil enters from the oil inlet port 44 on the middle housing 42, flows through the oil inlet flow channel 45, and then enters the first side shaft 14 from the oil inlet hole 11 on the rotating shaft 1, is thrown out to the inner wall of the second side shaft 15 from the oil distribution hole 161 on the oil distribution shaft 16 under the centrifugal force, and then continues to flow along the inner wall of the second side shaft 15 towards the front and rear groups of oil outlet holes 12 under the centrifugal force, and finally is directly thrown out from the two groups of oil outlet holes 12 to the stator winding 31 at both ends of the stator.

[0039] Further, the embodiment seals the axial outer side of the gap fit between the housing and the rotating shaft 1. Optionally, the second side shaft 15 of the embodiment is configured as a spline side shaft for transmitting power with an external connection; the first side shaft 14 is configured as a rotating variable side shaft, and one end of the rotating variable side shaft extending out of the rear end cover 43 can be rotatably installed with a rotating variable rotor (not shown in the figure), and a corresponding rotating variable stator (not shown in the figure) is installed on the rear end cover 43, thereby sealing the axial outer side of the gap fit between the rotating shaft 1 and the housing. Since the housing and the rotating shaft 1 are gap fitted in the embodiment, most of the cooling oil enters the inside of the rotating shaft 1 from the oil inlet hole 11, and only a small amount of cooling oil leaks towards the inside of the motor at the gap fit. Of course, in other embodiments, the axial outer side of the gap fit can also be sealed by setting the central part of the rear end cover 43 as an integral closed type, installing a sealing cover plate, or setting a dynamic sealing structure, etc.

[0040] The motor housing is also provided with two bearings 51 connected with the first side shaft 14 and the second side shaft 15, and an oil seal 52 is also provided for sealing. In addition, the motor housing of the embodiment can also be provided with an oil outlet (not shown in the figure) at the bottom of the front end cover 41 and / or the rear end cover 43, for example, and the cooling oil entering the inside of the motor can return to the oil tank through the oil outlet, and then be pumped into the motor from the oil inlet 44 by the oil pump, thereby realizing the circulation of the cooling oil.

[0041] As can be seen from the above, the rotating shaft, the rotor and the motor provided by the embodiment have a cooling oil passage structure, and the oil inlet hole is formed on the radial surface of the rotating shaft, compared with the prior art, the overall oil passage length is shortened, the flow resistance is reduced, the structure is simplified, and the axial length of the motor is also reduced.

[0042] Embodiment Two:

[0043] Compared with Embodiment One, the main difference of the embodiment is the different positions of the cooling oil ejection.

[0044] In Embodiment One, as shown in Figure 1 two groups of oil outlet holes 12 are provided on the rotating shaft 1, and the cooling oil is directly ejected to the stator windings 31 at both ends of the stator from the oil outlet holes 12; the path from the oil outlet holes 12 to the stator windings 31 is relatively long, and the cooling oil may not be accurately ejected to the stator windings 31, thereby affecting the cooling effect.

[0045] In the embodiment, as shown in Figure 2As shown, the two groups of oil outlet holes 12 on the rotating shaft 1 are closer to each other than in the first embodiment, and a plurality of oil throwing holes 211 are arranged on the two dynamic balance plates 21 of the rotor, with the oil throwing holes 211 corresponding to the oil outlet holes 12 on the rotating shaft 1 one by one, one end of the oil throwing hole 211 being communicated with the oil outlet hole 12, and the other end being directed towards the stator winding 31. In this way, compared with the first embodiment, the path from the oil throwing hole 211 to the stator winding 31 is shortened, and the cooling oil can be more accurately thrown onto the stator winding 31, ensuring the cooling effect. In addition, the other end of the oil throwing hole 211 can be provided as an inclined passage according to the need, so that the cooling oil can be better aligned and thrown out of each stator winding 31.

[0046] The remaining parts can be performed with reference to the first embodiment, which will not be described here.

[0047] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art within the technical range disclosed by the present application, according to the technical scheme and the inventive concept of the present application, can make equivalent replacement or change, which should be covered within the protection scope of the present application.

Claims

1. A rotating shaft having a cooling oil passage structure, characterized by comprising: The radial surface of the rotating shaft (1) is provided with an oil inlet hole (11), and the rotating shaft (1) is further provided with an oil outlet hole (12), and the inside of the rotating shaft (1) is formed with an axial flow channel (13) communicating with the oil inlet hole (11) and the oil outlet hole (12); cooling oil can enter the axial flow channel (13) from the oil inlet hole (11) and be thrown out from the oil outlet hole (12) under the action of centrifugal force.

2. A pivot according to claim 1, characterised in that The rotating shaft (1) is provided with at least one group of oil inlet holes (11), and the number of each group of oil inlet holes (11) is one or more; when the number of each group of oil inlet holes (11) is more, the plurality of oil inlet holes (11) are arranged in a circumferential interval.

3. A pivot according to claim 2, characterised in that The radial surface of the rotating shaft (1) is provided with the oil outlet hole (12), and the rotating shaft (1) is provided with at least one group of oil outlet holes (12), and the number of each group of oil outlet holes (12) is one or more; when the number of each group of oil outlet holes (12) is more, the plurality of oil outlet holes (12) are arranged in a circumferential interval.

4. A pivot according to claim 1 or 3, characterised in that The rotating shaft (1) comprises a first side shaft (14) and a second side shaft (15), the first side shaft (14) has a first opening facing the second side shaft (15), the second side shaft (15) has a second opening facing the first side shaft (14), and the first side shaft (14) and the second side shaft (15) are coaxially connected.

5. A pivot according to claim 4, wherein The oil inlet hole (11) is a group, which is arranged on the first side shaft (14), and the oil outlet hole (12) is two groups; the rotating shaft (1) further comprises a oil distribution shaft (16), a first end of the oil distribution shaft (16) is communicated with the first opening on the first side shaft (14), a second end of the oil distribution shaft (16) extends into the second side shaft (15), a second end of the oil distribution shaft (16) is radially provided with an oil distribution hole (161), and the oil distribution hole (161) is located at a middle position of the two groups of oil outlet holes (12).

6. A rotor characterized by, The rotating shaft (1) comprises a first side shaft (14) and a second side shaft (15), the first side shaft (14) has a first opening facing the second side shaft (15), the second side shaft (15) has a second opening facing the first side shaft (14), and the first side shaft (14) and the second side shaft (15) are coaxially connected.

7. The rotor of claim 6, wherein The rotor comprises a dynamic balance plate (21), the dynamic balance plate (21) is provided with an oil throwing hole (211), one end of the oil throwing hole (211) is communicated with the oil outlet hole (12), and the other end of the oil throwing hole (211) faces a stator winding (31) of a stator matched with the rotor.

8. An electric machine characterized by The rotor comprises a dynamic balance plate (21), the dynamic balance plate (21) is provided with an oil throwing hole (211), one end of the oil throwing hole (211) is communicated with the oil outlet hole (12), and the other end of the oil throwing hole (211) faces a stator winding (31) of a stator matched with the rotor.

9. The electric machine of claim 8, wherein, The motor further comprises a housing and a stator, the housing is provided with an oil inlet flow channel (45), one end of the oil inlet flow channel (45) is formed as an oil inlet port (44), the other end of the oil inlet flow channel (45) is gap matched with a radial rotating surface of the rotating shaft (1) provided with the oil inlet hole (11); cooling oil enters the oil inlet flow channel (45) from the oil inlet port (44), enters the axial flow channel (13) in the rotating shaft (1) from the oil inlet hole (11) on the rotating shaft (1), and is directly or indirectly thrown to the stator winding (31) of the stator under the action of centrifugal force.

10. The electric machine of claim 9, wherein, The housing is gap matched with the rotating shaft (1) on the axial outside.

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