Oil-cooled rotor core and motor

Abstract

The oil-cooled rotor core comprises a rotating shaft and a plurality of laminations, the motor further comprises an oil duct, the plurality of laminations are laminated along the height direction to form the rotor core, the rotor core takes the rotating shaft as an axis and is sleeved with the rotating shaft, the laminations comprise a second lamination and at least two groups of first laminations, the first laminations are located at two ends of the rotating shaft, and the second lamination is located at two ends of the rotating shaft. The second laminations are located in the middle of the rotating shaft, the inner diameter of the second laminations is larger than that of the first laminations, the second laminations are in clearance fit with the rotating shaft, and oil channels are formed between the multiple second laminations and the rotating shaft. In the process of laminating the laminations into the rotor core, the first lamination in interference fit with the rotating shaft is laminated at the two ends of the rotor core, the inner diameter of the second lamination is directly enlarged to serve as an oil duct, and the second lamination is laminated at the middle section of the rotor core and is not in contact with the rotating shaft. The structural design can reduce the weight of the rotor iron core, reduce the oil flow resistance, increase the contact area of oil and the rotor iron core, and improve the cooling efficiency of the rotor iron core.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to an oil-cooled rotor core and a motor. Background Art

[0002] The rotor core will generate a lot of heat when rotating at high speed. Due to the large heat capacity of oil, the oil cooling system can effectively take away this heat. Therefore, it is often used to cool the motor rotor to reduce the temperature of the rotor core, prevent overheating damage, keep the rotor core within a suitable operating temperature range, and improve the efficiency and performance of the motor.

[0003] Cooling oil is transported to the rotor through the motor shaft passing through the rotor. A plurality of oil outlet holes are arranged in the motor shaft. In the prior art, in order to increase the oil output, the oil pressure is usually increased. However, excessive pressure may cause leakage of the oil pipe or the seal, thereby increasing maintenance costs and the risk of damage.

[0004] In view of this, it is necessary to develop an oil-cooled rotor core and a motor to solve the above problems. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to realize an oil-cooled rotor core and a motor which reduce the oil flow resistance and the core weight.

[0006] The purpose of the utility model is achieved by the following technical solutions:

[0007] A motor comprises a rotating shaft and a plurality of laminations, the motor further comprising an oil passage, the plurality of laminations being stacked in a height direction to form a rotor core, the rotor core being centered on the rotating shaft and being sleeved with the rotating shaft, the laminations comprising a second lamination and at least two groups of first laminations, the first laminations being located at both ends of the rotating shaft, the second laminations being located in the middle of the rotating shaft, the inner diameter of the second laminations being greater than the inner diameter of the first laminations, the second laminations being loosely fitted with the rotating shaft, and the oil passage being formed between the plurality of second laminations and the rotating shaft.

[0008] Preferably, the first laminations are provided with first oil holes, the first oil holes are arranged at intervals around the rotating shaft in the circumferential direction, and the first oil holes are communicated with the oil passage.

[0009] Preferably, an oil outlet hole is provided in the middle of the rotating shaft, and the height of the oil outlet hole is within the height range of the oil passage.

[0010] Preferably, the first stack is partially interference fit with the shaft.

[0011] Preferably, the first stack is further provided with a second oil hole, the second oil hole is formed by the inner diameter of the first stack and the shaft gap, and the second oil hole is communicated with the oil passage.

[0012] Preferably, a cross-sectional dimension of the first oil hole is greater than a cross-sectional dimension of the second oil hole.

[0013] Preferably, the rotating shaft comprises a hollow section, a flow channel is provided on the inner wall of the rotating shaft, and the hollow section is communicated with the oil channel through the flow channel.

[0014] Preferably, the first stack further includes a protrusion, the protrusion is located on the inner diameter of the first stack, and a plurality of the protrusions are stacked to form a limiting strip.

[0015] Preferably, the rotating shaft is provided with a limiting groove, and the limiting strip is inserted into the limiting groove to achieve the limiting of the plurality of first stacked sheets.

[0016] An oil-cooled rotor core includes a plurality of laminations, which are stacked in a height direction to form a rotor core. The laminations include a second lamination and at least two groups of first laminations. The second lamination is located between the first laminations, and the inner diameter of the second lamination is greater than the inner diameter of the first lamination.

[0017] Compared with the prior art, the oil-cooled rotor core and motor of the utility model have the following advantages:

[0018] The present application discloses an oil-cooled rotor core and a motor. The rotor core is formed by stacking a plurality of laminations in a height direction. The rotor core takes a rotating shaft as an axis and is sleeved with the rotating shaft. The inner diameter of the second lamination is greater than the inner diameter of the first lamination. The second lamination and the rotating shaft are clearance-matched. An oil passage is formed between the plurality of second laminations and the rotating shaft. Such a structural design can reduce the weight of the rotor core, reduce the oil flow resistance, and increase the contact area between the oil and the rotor core, thereby improving the cooling efficiency of the rotor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the motor of this application;

[0020] Figure 2 This is a schematic diagram of the structure of the motor of the present application from another perspective;

[0021] Figure 3 This is a partial structural schematic diagram of the motor of the present application without the first lamination;

[0022] Figure 4 This is a partial structural schematic diagram of the motor of the present application without the first lamination and the second lamination;

[0023] Figure 5 This is a cross-sectional view of the motor of this application.

[0024] In the figure: 100, rotor core; 101, first lamination; 1011, limit strip; 102, second lamination; 200, rotating shaft; 201, limit groove; 202, oil outlet hole; 203, flow channel; 300, oil channel; 301, first oil hole; 302, second oil hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] Figure 1 to Figure 5 The utility model discloses an oil-cooled rotor core and a motor, wherein the motor comprises a rotor core 100, a rotating shaft 200 and an oil passage 300. The rotor core 100 is centered on the rotating shaft 200 and is sleeved with the rotating shaft 200. The rotor core 100 is formed by stacking a plurality of laminations in a height direction.

[0029] The rotor core 100 includes a first lamination 101 and a second lamination 102 . The first lamination 101 is located at two ends of the rotating shaft 200 , and the second lamination 102 is located in the middle of the rotating shaft 200 .

[0030] Specifically, the number of the first stack 101 is multiple. In the embodiment of the present application, the number of the first stack 101 is two.

[0031] Specifically, the inner diameter of the second laminate 102 is greater than the inner diameter of the first laminate 101 .

[0032] The first laminate 101 includes a protruding piece, which is located on the inner diameter of the first laminate 101. A plurality of protruding pieces are stacked to form a limiting strip 1011 for positioning.

[0033] The rotating shaft 200 is provided with a limiting groove 201, and the first laminate 101 and the rotating shaft 200 are limited by the limiting strip 1011 and the limiting groove 201. In some other embodiments, a clamping groove is provided on the outer wall of the first laminate 101, and the limiting of the laminate is achieved by welding.

[0034] Specifically, the first laminate 101 and the rotating shaft 200 are partially interference fit.

[0035] Specifically, the second laminate 102 and the rotating shaft 200 are clearance-matched.

[0036] An oil outlet hole 202 is provided in the middle of the rotating shaft 200. The interior of the rotating shaft 200 is hollow. A flow channel 203 is provided on the inner wall of the rotating shaft 200. The height of the oil outlet hole 202 is located within the height range of the oil channel 300. The oil channel 300 is connected to the oil outlet hole 202 through the flow channel 203, thereby forming a closed passage, which can increase the flow rate under supercharging conditions and improve the cooling efficiency.

[0037] The oil passage 300 is communicated with a first oil hole 301 and a second oil hole 302 respectively. The first oil hole 301 is located on the first laminate 101 , and the second oil hole 302 is formed by a gap between the inner diameter of the first laminate 101 and the rotating shaft 200 .

[0038] Specifically, the oil passage 300 surrounds the rotating shaft 200 in a circumferential direction.

[0039] Specifically, the first oil hole 301 is located outside the second oil hole 302 , and the cross-sectional size of the first oil hole 301 is greater than the cross-sectional size of the second oil hole 302 .

[0040] When the oil-cooled rotor core and motor of the present application are in use, cooling oil is input through the hollow section of the rotating shaft 200, flows out from the oil outlet hole 202 under the action of pressure, and enters the oil passage 300 through the flow channel 203. The cooling oil in the oil passage 300 moves toward the first oil hole 301 and the second oil hole 302 at the upper and lower ends of the rotating shaft 200 under the action of pressure, and is finally discharged from the first oil hole 301 and the second oil hole 302 to realize an internal circulation. The discharged cooling oil is collected by the device and re-input through the hollow section of the rotating shaft 200, thereby realizing recycling. The present application discloses an oil-cooled rotor core and a motor, wherein a rotor core 100 is formed by stacking a plurality of laminations in a height direction, wherein the rotor core 100 is centered on a rotating shaft 200 and is sleeved with the rotating shaft 200, wherein an inner diameter of a second lamination 102 is greater than an inner diameter of a first lamination 101, and a clearance is fitted between the second laminations 102 and the rotating shaft 200, and an oil passage 300 is formed between the plurality of second laminations 102 and the rotating shaft 200. Such a structural design can reduce the weight of the rotor core 100, reduce the oil flow resistance, and increase the contact area between the oil and the rotor core 100, thereby improving the cooling efficiency of the rotor core 100.

[0041] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, several modifications and improvements can be made, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the utility model, and all of them belong to the protection scope of the utility model.

Claims

1. A motor comprising a rotating shaft and a plurality of laminations, characterized in that: The motor also includes an oil passage, and a plurality of the laminations are stacked in a height direction to form a rotor core, the rotor core takes the rotating shaft as an axis and is sleeved with the rotating shaft, the laminations include a second lamination and at least two groups of first laminations, the first laminations are located at both ends of the rotating shaft, the second laminations are located in the middle of the rotating shaft, the inner diameter of the second laminations is larger than the inner diameter of the first laminations, the second laminations are gap-matched with the rotating shaft, and the oil passages are formed between the plurality of the second laminations and the rotating shaft.

2. The motor according to claim 1, characterized in that: The first lamination is provided with first oil holes, the first oil holes are arranged at intervals around the rotating shaft in the circumferential direction, and the first oil holes are communicated with the oil passage.

3. The motor according to claim 1, characterized in that: An oil outlet hole is arranged in the middle of the rotating shaft, and the height of the oil outlet hole is located within the height range of the oil passage.

4. The motor according to claim 1, characterized in that: The first stack is partially interference fit with the shaft.

5. The motor according to claim 2, characterized in that: The first stack is further provided with a second oil hole, which is formed by the inner diameter of the first stack and the shaft gap, and the second oil hole is communicated with the oil passage.

6. The motor according to claim 5, characterized in that: A cross-sectional dimension of the first oil hole is greater than a cross-sectional dimension of the second oil hole.

7. The motor according to claim 1, characterized in that: The rotating shaft comprises a hollow section, a flow channel is arranged on the inner wall of the rotating shaft, and the hollow section is communicated with the oil channel through the flow channel.

8. The motor according to claim 1, characterized in that: The first laminate further includes a protruding piece, and the protruding piece is located on the inner diameter of the first laminate. A plurality of the protruding pieces are stacked to form a limiting strip.

9. The motor according to claim 8, characterized in that: The rotating shaft is provided with a limiting groove, and the limiting strip is inserted into the limiting groove to realize the limiting of the first plurality of laminations.

10. An oil-cooled rotor core, characterized in that: It comprises a plurality of laminations which are stacked in height direction to form a rotor core. The laminations comprise a second lamination and at least two groups of first laminations. The second lamination is located in the middle of the first lamination. The inner diameter of the second lamination is greater than the inner diameter of the first lamination.

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