Motor shaft and motor

Abstract

The utility model discloses a motor shaft, which comprises a first shaft provided with a hollow channel, the hollow channel comprises a first channel and a second channel, one axial end of the first channel is provided with a first opening, and the other axial end of the first channel is connected with the second channel; the second shaft comprises a first part and a second part, a groove is formed in the outer surface of the first part, an oil throwing hole communicated with the groove is formed in the second part, and the oil throwing hole is right opposite to the bearing; the first part is embedded in the first channel through the first opening, and the second part is located outside the first opening, so that the groove and the inner wall of the first channel form an oil throwing channel communicated with the oil throwing hole. According to the utility model, the influence on the motor performance can be avoided, and the weight and the cost are reduced. The utility model also provides a motor.

Description

Technical Field

[0001] The utility model relates to the field of motors, and particularly to a motor shaft and a motor. Background Art

[0002] At present, in order to meet the market requirements for power density and system speed of the new energy three-electricity system (including three parts: battery, motor and electronic control), its cooling system has been changed from water cooling to oil cooling. The reducer and the motor share the cooling oil. Under such a premise, the bearing connecting the motor and the motor shaft has been changed from a closed bearing to an open bearing, so additional lubrication is required for the bearing.

[0003] In order to lubricate the bearing, the currently commonly used method is mainly to adopt a one-piece forged motor shaft, that is, an integrally formed motor shaft, and an inclined hole facing the bearing is opened on the motor shaft, so that the cooling oil flows to the bearing through the inclined hole. However, due to one-piece forging, the overall weight of the motor shaft is relatively large. When assembled on the motor, it will affect the speed and performance of the motor. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the current one-piece motor shaft affects the performance of the motor. The utility model provides a motor shaft and a motor, which can avoid affecting the performance of the motor, and at the same time reduce the weight and cost.

[0005] To solve the above technical problems, an embodiment of the utility model discloses a motor shaft, including:

[0006] A first shaft, the first shaft is provided with a hollow channel, the hollow channel includes a first channel and a second channel, one axial end of the first channel has a first opening, and the other axial end of the first channel is connected to the second channel;

[0007] A second shaft, the second shaft includes a first part and a second part, a groove is opened on the outer surface of the first part, and an oil throwing hole communicating with the groove is opened on the second part, and the oil throwing hole is arranged facing the bearing;

[0008] The first part is embedded in the first channel through the first opening, and the second part is located outside the first opening, so that the groove and the inner wall of the first channel form an oil throwing channel communicating with the oil throwing hole.

[0009] With the above technical solution, the first channel is connected to the second channel, the oil slinging hole is communicated with the groove, the groove and the inner wall of the first channel form an oil slinging channel communicated with the oil slinging hole, and the oil slinging hole is disposed opposite to the bearing. With such a design, when a cooling medium (such as cooling oil) is introduced into the hollow channel, the cooling medium (such as cooling oil) can flow from the second channel to the oil slinging channel, then from the oil slinging channel to the oil slinging hole, and finally from the oil slinging hole to the bearing to lubricate it.

[0010] Compared with the conventional one-piece forged motor shaft, the motor shaft of the present embodiment is composed of two sections, namely a first shaft and a second shaft, which has a lower cost and a lighter weight. That is, while meeting the requirements of cost reduction and weight reduction, the lubrication of the bearing is achieved, and the influence on the performance of the motor is also avoided.

[0011] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor shaft. In the radial direction, the projection of the oil slinging hole includes a first wall and a second wall. The first wall is closer to the outer surface of the second part than the second wall. The distance from the first wall to the central axis of the first shaft is a first distance, and the distance from the inner wall of the first channel to the central axis of the first shaft is a second distance. The first distance is greater than the second distance.

[0012] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor shaft. The second wall is flush with or higher than the bottom wall of the groove.

[0013] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor shaft. The part of the first part where the groove is not opened is in interference fit with the first shaft.

[0014] With the above technical solution, the part of the first part where the groove is not opened is in interference fit with the first shaft, so that the first shaft and the second shaft can be stably connected.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor shaft. The groove includes a plurality of grooves arranged at intervals along the circumference of the first part, and the oil slinging hole includes a plurality of oil slinging holes corresponding to the plurality of grooves one by one.

[0016] With the above technical solution, by providing a plurality of oil slinging holes and grooves, the bearing can be lubricated comprehensively, and its service life can be extended.

[0017] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a motor shaft. The radius of the second part abuts against one end of the first opening away from the second channel along the axial direction.

[0018] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor shaft. Along the radial direction and from the inside to the outside, the outer wall of the second part is not higher than the outer wall of the first channel.

[0019] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor shaft. The second shaft further includes a third part. The first part, the second part, and the third part are connected in sequence. The radius of the second part is greater than the radius of the third part, and the bearing is arranged on the third part.

[0020] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor shaft. The radius of the first channel is greater than the radius of the second channel.

[0021] Adopting the above technical solution, the radius of the first channel is greater than the radius of the second channel. That is to say, the wall thickness of the first channel is less than the wall thickness of the second channel. Along the radial direction and from the inside to the outside, the first wall of the oil slinger hole is higher than the inner wall of the first channel. That is, the inner wall of the second channel, the inner wall of the first channel, and the first wall of the oil slinger hole expand outward in a stepped manner. That is, when the cooling oil flows from the second channel to the oil slinger channel and then to the oil slinger hole, the cooling oil continuously flows in the direction of expanding radially and continuously outward.

[0022] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor shaft. One end of the second channel away from the first channel is used for liquid inlet.

[0023] Adopting the above technical solution, the cooling medium (such as cooling oil) can flow from the second channel to the oil slinger channel, then from the oil slinger channel to the oil slinger hole, and finally flow to the bearing to lubricate it.

[0024] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses a motor, including a motor housing and the motor shaft as described in any one of the above embodiments. The motor shaft is connected to the motor housing through the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Showing a cross-sectional view of a motor shaft of one-piece forging in the prior art;

[0026] Figure 2 Showing a cross-sectional view of a motor shaft of two-piece forging in the prior art;

[0027] Figure 3 Showing a perspective view of the motor shaft provided by the embodiment of the present utility model;

[0028] Figure 4 Showing a cross-sectional view of the motor shaft provided by the embodiment of the present utility model;

[0029] Figure 4a An enlarged view showing the oil slinging channel provided by the embodiment of the present utility model;

[0030] Figure 5 A perspective view showing the first shaft provided by the embodiment of the present utility model;

[0031] Figure 6 A sectional view showing the first shaft provided by the embodiment of the present utility model;

[0032] Figure 7 A perspective view showing the second shaft provided by the embodiment of the present utility model;

[0033] Figure 8 A sectional view showing the second shaft provided by the embodiment of the present utility model.

[0034] Reference numerals: Among them, 1, motor shaft; 2, cooling medium channel; 3, inclined hole; 4, bearing; 10, first shaft; 100, hollow channel; 101, first channel; 102, second channel; 103, first opening; 104, first section; 1040, inclined groove; 105, second section; 106, third section; 107, fourth section; 1070, oil supply hole; 108, annular cover; 1080, positioning hole; 20, second shaft; 200, first part; 201, second part; 202, groove; 203, oil slinging hole; 2031, first wall; 2032, second wall; 204, oil slinging channel; 205, third part; 206, fourth part. Detailed implementation manners

[0035] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model will be introduced in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details will be included in the following description. The present utility model can also be implemented without these details. In addition, in order to avoid confusing or obscuring the key points of the present utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other.

[0036] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0038] The terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "connected to" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0040] To make the purpose, technical solutions and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below with reference to the drawings.

[0041] Referring to Figure 1 , currently, the motor shaft 1 is usually forged in one piece, with a cooling medium channel 2 opened inside. An inclined hole 3 is opened on the outer surface of the motor shaft 1 near the bearing 4. The inclined hole 3 is aligned with the bearing 4. The cooling medium (such as cooling oil) flows from the cooling medium channel 2 through the inclined hole 3 and finally flows to the bearing 4 to lubricate the bearing 4. The size of the cooling medium channel 2 of the entire motor shaft 1 is the same, which results in a relatively large weight of the entire motor shaft 1, more materials are used, and the cost increases accordingly. At the same time, after being installed on the motor, due to the large weight, it will affect the rotation speed and performance of the motor.

[0042] Therefore, referring to Figure 2 and combining with Figure 1 , some motor shafts 1 are forged in two sections, including a first shaft 10 and a second shaft 20. The first shaft 10 surrounds the second shaft 20 and is in interference fit with the second shaft 20 to connect the first shaft 10 and the second shaft 20. The first shaft 10 is provided with a cooling medium channel 2. An inclined hole 3 is opened on the outer surface of the second shaft 20 near the bearing 4. When the motor shaft 1 is working, due to the action of centrifugal force, most of the cooling medium (such as cooling oil) is trapped at the joint of the first shaft 10 and the second shaft 20 and cannot reach the bearing 4, resulting in poor lubrication effect.

[0043] To solve the above problems, an embodiment of the present application provides a motor shaft 1. By providing an oil slinging channel, when the motor shaft 1 rotates, under the action of centrifugal force, a cooling medium (such as cooling oil) can flow through the oil slinging channel to the bearing 4 for lubrication.

[0044] An embodiment of the present application provides a motor (not shown in the figure), including a motor housing and a motor shaft 1. The motor shaft is connected to the motor housing through a bearing 4, and the motor shaft 1 passes through the motor housing. It should be noted that the motor shaft in the embodiment of the present application can also be used in other devices that require a rotating shaft, such as a speed reducer, a differential, etc.

[0045] Exemplarily, referring to Figures 3 to 6 , the above-mentioned motor shaft 1 includes: a first shaft 10 and a second shaft 20. The first shaft 10 is provided with a hollow channel 100. The hollow channel 100 includes a first channel 101 and a second channel 102. One axial end of the first channel 101 has a first opening 103, and the other axial end (i.e., the Figure 6 X direction shown) of the first channel 101 is connected to the second channel 102.

[0046] Exemplarily, referring to Figures 4 to 8 , the second shaft 20 includes a first part 200 and a second part 201. A groove 202 is formed on the outer surface of the first part 200. The groove 202 axially (i.e., the Figure 7 X direction shown) penetrates the first part 200. An oil slinging hole 203 communicating with the groove 202 is formed in the second part 201. The oil slinging hole 203 axially penetrates the second part 201, and the oil slinging hole 203 is disposed opposite to the bearing 4 (refer to Figure 1 ); the first part 200 is embedded in the first opening 103 so that the groove 202 and the inner wall of the first channel 101 form an oil slinging channel 204 communicating with the oil slinging hole 203.

[0047] Exemplarily, the first channel 101 is connected to the second channel 102, the oil slinging hole 203 is connected to the groove 202, the groove 202 and the inner wall of the first channel 101 form an oil slinging channel 204 communicating with the oil slinging hole 203, the oil slinging hole 203 is disposed opposite to the bearing, and the oil slinging channel 204 is parallel to the oil slinging hole 203. When a cooling medium (such as cooling oil) is introduced into the hollow channel 100, the cooling medium (such as cooling oil) can flow from the second channel 102 to the oil slinging channel 204, then flow from the oil slinging channel 204 into the oil slinging hole 203, and then flow to the bearing for lubrication.

[0048] Compared with the conventional one-piece forged motor shaft, the motor shaft in the embodiment of the present application is composed of two sections, namely the first shaft 10 and the second shaft 20. It has lower cost and lighter weight, that is, while meeting the requirements of reducing cost and weight, it realizes the lubrication of the bearing.

[0049] Exemplarily, the radius of the first channel 101 (i.e., Figure 6 R1 shown) is greater than the radius of the second channel 102 (i.e., Figure 6 R2 shown), and in the radial and outward direction (i.e., Figure 4 direction a shown), a part of the oil slinging hole 203 is higher than the inner wall of the first channel 101.

[0050] Combined with Figure 4a , when the motor operates to drive the motor shaft to rotate, under the action of centrifugal force, the cooling medium (such as cooling oil) continuously flows in the radial and outward expanding direction (i.e., Figure 4a from A to B shown), and the radius of the first channel 101 (i.e., Figure 6 R1 shown) is greater than the radius of the second channel 102 (i.e., Figure 6 R2 shown), that is to say, the wall thickness of the first channel 101 (i.e., Figure 6 h1 shown) is less than the wall thickness of the second channel 102 (i.e., Figure 6 h2 shown).

[0051] In the radial and outward direction (i.e., Figure 4 direction a shown), a part of the oil slinging hole 203 is higher than the inner wall of the first channel 101, that is, the inner wall of the second channel 102, the inner wall of the first channel 101, and a part of the oil slinging hole 203 are arranged in a stepped manner and expand outward. This design is the same as the movement trajectory of the cooling medium (such as cooling oil) under the action of centrifugal force (i.e., Figure 4a from A to B shown). In this way, it can be ensured that the cooling medium (such as cooling oil) can flow from the first channel 101 to the oil slinging channel 204, then to the oil slinging hole 203, and finally to the bearing to lubricate it, rather than being trapped at the connection of the first shaft 10 and the second shaft 20.

[0052] Exemplarily, referring to Figure 4 and Figure 4a and combined with Figure 6 and Figure 7 , the projection of the oil slinging hole 203 includes a first wall 2031 and a second wall 2032. A part of the oil slinging hole 203 includes the first wall 2031. The first wall 2031 is closer to the outer surface of the second part 201 than the second wall 2032. The distance from the first wall 2031 to the central axis L of the first shaft 10 is the first distance (i.e., Figure 4 L1 shown), the distance from the inner wall of the first channel 101 to the central axis L of the first shaft 10 is the second distance (i.e., Figure 4 L2 shown), and the distance from the inner wall of the second channel 102 to the central axis of the first shaft 10 is the third distance (i.e., Figure 4As shown in L3), the first distance is greater than the second distance which is greater than the third distance, and the second wall 2032 is flush with the bottom wall of the groove 202 or the second wall 2032 is higher than the bottom wall of the groove 202.

[0053] That is to say, taking the first plane as the cross-section, the first plane extends along the radial direction (i.e., Figure 4 the Y direction shown) and the axial direction (i.e., Figure 4 the X direction shown), the first plane intersects at two points that are farthest from the oil slinger hole 203 along the radial direction, and intersects with the bottom wall of the groove 202, so that the motor shaft projects an image as shown in Figure 4 shown.

[0054] Exemplarily, referring to Figure 7 and Figure 8 , the groove 202 includes a plurality of circumferentially spaced along the first part 200, and the oil slinger hole 203 includes a plurality of corresponding to the plurality of grooves 202 one by one. Setting the plurality of grooves 202 and oil slinger holes 203 can lubricate the bearing comprehensively and extend its service life. It should be noted that the embodiments of the present application do not limit the number of the oil slinger holes 203 and the grooves 202, as long as the numbers of the two correspond one by one. For example, the two shown in the embodiments of the present application, or it can also be one, three, four, five, etc.

[0055] Next, referring to Figure 5 and Figure 6 and combining with Figure 3 , the specific structure of the first shaft 10 will be introduced in detail.

[0056] Exemplarily, the first shaft 10 is integrally formed. The first shaft 10 includes a first section 104, a second section 105, a third section 106, and a fourth section 107 connected in sequence. The interiors of the first section 104, the second section 105, the third section 106, and the fourth section 107 are all hollowed out to form a hollow channel 100. The radius of the first section 104 is less than the radius of the second section 105 which is less than the radius of the third section 106 which is less than the radius of the fourth section 107.

[0057] The first section 104 is used to connect with an external device (such as a speed reducer). The outer surface of the first section 104 is provided with a plurality of inclined grooves 1040 for feeding oil to the external device. The inside of the first section 104 is for liquid inlet, for example, an inlet pipe is sleeved. An annular cover 108 is wound around the outer surface of the fourth section 107. Along the circumferential direction, two positioning holes 1080 are provided on the annular cover 108, and a plurality of oil feeding holes 1070 are provided on the outer surface of the fourth section 107.

[0058] It should be noted that the embodiments of the present application do not limit the number of the positioning holes 1080 and the oil feeding holes 1070, and can be selected according to needs, such as two, five, ten, etc.

[0059] Next, referring toFigure 7 and Figure 8 , a detailed introduction to the specific structure of the second shaft 20 will be given.

[0060] Exemplarily, the second shaft 20 further includes a third part 205 and a fourth part 206. The above-mentioned first part 200, the above-mentioned second part 201, the third part 205 and the fourth part 206 are connected in sequence. The first part 200, the second part 201 and the third part 205 are hollow inside. The radius of the second part 201 is greater than the radius of the first part 200 which is greater than the radius of the third part 205 which is greater than the radius of the fourth part 206. The first part 200, the second part 201 and the third part 205 are hollow inside, which can reduce the weight of the second shaft 20.

[0061] Exemplarily, further in combination with Figure 5 and Figure 6 , the outer surface of the first part 200 without the groove 202 is in interference fit with the first shaft 10 so that the first shaft 10 and the second shaft 20 can be stably connected. The second part 201 abuts against one end of the first opening 103 away from the second channel 102 along the axial direction (i.e., the X direction shown in Figure 7 ). The bearing is connected to the third part 205, and the fourth part 206 is used to connect an external device.

[0062] Exemplarily, along the radial direction and from the inside to the outside, the outer wall of the second part 201 is not higher than the outer wall of the first channel 101.

[0063] Referring to Figures 3 to 8 , after the motor shaft is installed on the motor, when the motor starts to work, it will drive the motor shaft to rotate. The cooling medium (such as cooling oil) enters from the liquid inlet pipe, flows through the first section 104, the second section 105, the third section 106, and the second channel 102 of the first shaft 10. Under the action of centrifugal force, it then flows from the oil-slinging channel 204 to the oil-slinging holes 203, and finally flows to the bearing for lubrication. Due to the action of centrifugal force, the cooling medium (such as cooling oil) always flows along the radial direction and outward. The inner walls of the first channel 101, the inner wall of the second channel 102 and a part of the oil-slinging holes 203 set in a stepped manner and expanding outward in the present embodiment of the application just meet this rule, so that the cooling medium (such as cooling oil) can flow to the bearing for lubrication.

[0064] Although the present invention has been illustrated and described by referring to some preferred embodiments of the present invention, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A motor shaft, characterized in that: include: A first shaft, wherein the first shaft is provided with a hollow channel, the hollow channel comprises a first channel and a second channel, one axial end of the first channel has a first opening, and the other axial end of the first channel is connected to the second channel; A second shaft, the second shaft comprises a first part and a second part, the outer surface of the first part is provided with a groove, the second part is provided with an oil-slinging hole connected with the groove, and the oil-slinging hole is arranged opposite to the bearing; The first portion is embedded in the first channel via the first opening, and the second portion is located outside the first opening, so that the groove and the inner wall of the first channel form an oil-swinging channel connected to the oil-swinging hole.

2. The motor shaft according to claim 1, characterized in that: In the radial direction, the projection of the oil-slinging hole includes a first wall and a second wall, the first wall is closer to the outer surface of the second part than the second wall, the distance from the first wall to the central axis of the first shaft is a first distance, the distance from the inner wall of the first channel to the central axis of the first shaft is a second distance, and the first distance is greater than the second distance.

3. The motor shaft according to claim 2, characterized in that: The second wall is flush with or higher than the bottom wall of the groove.

4. The motor shaft according to claim 1, characterized in that: A portion of the first part where the groove is not formed is interference fit with the first shaft.

5. The motor shaft according to claim 1, characterized in that: The grooves include a plurality of grooves spaced apart from each other along the circumference of the first portion, and the oil-slinging holes include a plurality of holes corresponding to the plurality of grooves one by one.

6. The motor shaft according to claim 1, characterized in that: The radius of the second portion is greater than that of the first portion, and the second portion abuts against an end of the first opening away from the second channel along the axial direction.

7. The motor shaft according to claim 1, characterized in that: In the radial direction from inside to outside, the outer wall of the second portion is not higher than the outer wall of the first channel.

8. The motor shaft according to claim 1, characterized in that: The second shaft also includes a third part, the first part, the second part and the third part are connected in sequence, the radius of the second part is greater than the radius of the third part, and the bearing is arranged on the third part.

9. The motor shaft according to claim 1, characterized in that: The radius of the first channel is greater than the radius of the second channel.

10. The motor shaft according to claim 1, characterized in that: An end of the second channel away from the first channel is used for liquid inlet.

11. A motor, characterized in that: It comprises a motor housing and a motor shaft as described in any one of claims 1 to 10, wherein the motor shaft is connected to the motor housing through the bearing.

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