A motor shaft

Abstract

The present invention discloses a motor shaft. A hollow structure is provided axially at at least one end of the motor shaft. A coolant pumping mechanism with spiral grooves is provided at a position close to the shaft end of the hollow structure, so that the coolant can enter the hollow structure by relying on the attraction generated by the rotation of the motor shaft. The spiral grooves are provided on the inner surface of an annular member, and the annular member is fixedly assembled on the hollow structure, or the spiral grooves are directly provided on the inner surface of the hollow structure. A plurality of groups of coolant channels are provided radially on the motor shaft, and the coolant channels are communicated with the hollow structure. When the motor shaft rotates, the oil in the hollow structure is thrown out through the coolant channels for cooling the internal components of the motor housing. In the present invention, by providing the hollow structure and the coolant pumping mechanism, a structure similar to a pump is formed. When the motor shaft rotates, the coolant can be sucked into the hollow structure and then thrown out through the coolant channels, realizing the cooling and lubrication of the internal components of the motor housing and improving the heat dissipation capacity of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor manufacturing, and particularly relates to a motor shaft. Background Art

[0002] With the development of the automotive manufacturing industry, the continuous performance of new energy vehicle motors has become an important technical indicator for the quality of modern vehicle manufacturing. The continuous performance of motors is mainly related to the loss heat generation of the motors themselves and the cooling and heat dissipation capabilities, and the loss heat generation of the motors themselves is related to the hardware design of the motors. How to optimize the design of the cooling structure can effectively improve the heat dissipation capacity of the motors, thereby improving the continuous performance of the motors and even the vehicles, which is the direction of efforts of major vehicle manufacturing enterprises and parts enterprises in the international automotive industry.

[0003] The main factors affecting the continuous power and continuous performance of motors include electromagnetic design and structural design, such as copper loss, iron loss, and mechanical loss, etc. For new energy vehicle motors, the key to improving the continuous performance lies in how to reduce various losses or improve the heat dissipation capacity. Since various losses are restricted by the required target performance, the space for reducing losses from the hardware itself is limited, so the optimization of the cooling structure becomes a solution with high efficiency and low cost. Summary of the Invention

[0004] In view of the above problems, the present invention discloses a motor shaft to overcome or at least partially solve the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a motor shaft, and a hollow structure is provided axially at at least one end of the motor shaft. A coolant pumping mechanism with spiral grooves is provided at a position close to the end of the hollow structure, so that the coolant can enter the hollow structure by relying on the attraction generated by the rotation of the motor shaft.

[0007] The spiral grooves are provided on the inner surface of an annular member, and the annular member is fixedly assembled on the hollow structure, or the spiral grooves are directly provided on the inner surface of the hollow structure.

[0008] A plurality of groups of coolant channels are provided radially on the motor shaft, and the coolant channels are communicated with the hollow structure. When the motor shaft rotates, the oil in the hollow structure is thrown out through the coolant channels for cooling the internal components of the motor housing.

[0009] Further, the coolant pumping mechanism further includes a core shaft, the core shaft is arranged inside the spiral grooves, and the spiral grooves and the core shaft can rotate relative to each other.

[0010] Further, the mandrel is fixedly connected or integrally provided with a hollow tube disposed at the end, the hollow tube is externally communicated with the motor shaft, and a plurality of radial holes are formed in the tube wall of the hollow tube at a position close to the spiral groove.

[0011] Further, the hollow tube is a horn tube, the mandrel is fixedly disposed inside the horn tube on the side away from the end, and the mandrel extends toward the horn mouth of the horn tube at the radial hole, so as to increase the attraction force of the coolant pumping mechanism.

[0012] Further, the hollow tube is joined to an external coolant tube, or the hollow tube extends out of the motor shaft to receive the coolant inside the motor housing.

[0013] Further, the hollow tube is fixed to the motor housing assembly.

[0014] Further, the clearance distance between the mandrel and the spiral groove in the radial direction is adjustable.

[0015] Further, the coolant pumping mechanism is disposed at one end or both ends of the motor shaft, and the coolant pumping mechanisms at both ends are the same or different.

[0016] Further, the coolant passage can be inclined or perpendicular to the axis of the motor shaft as required, for cooling or lubricating any one or several of the motor bearings, stator windings or rotors.

[0017] Further, each group of coolant passages includes a plurality of passages, which are evenly distributed on the motor shaft; and / or,

[0018] An annular groove is provided near the shaft end on the outer side of the spiral groove, and the coolant enters the spiral groove through the annular groove.

[0019] The advantages and beneficial effects of the present invention are:

[0020] In the present invention, by providing a hollow structure inside the motor shaft and arranging a coolant pumping mechanism inside the hollow structure to form a structure similar to a pump, when the motor shaft rotates, the coolant can enter the hollow structure by relying on the attraction force generated by the rotation of the motor shaft, and then be thrown out through the coolant passage, so as to realize the cooling and lubrication of the internal components of the motor housing, effectively improving the heat dissipation capacity of the motor and enhancing the continuous performance of the motor; and the motor shaft structure of the present invention is simple and easy to manufacture. Description of the Drawings

[0021] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Also, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0022] Figure 1 is an axial sectional view of a motor shaft in one embodiment of the present invention;

[0023] Figure 2 is an axial sectional view of a motor shaft in one embodiment of the present invention;

[0024] Figure 3 is an axial sectional view of a motor shaft in one embodiment of the present invention;

[0025] Figure 4 is a positional structure diagram of a coolant pumping mechanism in one embodiment of the present invention;

[0026] Figure 5 is an axial sectional view of a motor shaft assembled with a rotor in one embodiment of the present invention.

[0027] In the figure: 1, hollow structure; 2, spiral groove; 3, annular member; 4, coolant passage; 5, mandrel; 6, hollow tube; 7, annular groove. Specific Embodiments

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0029] The following will describe in detail the technical solutions provided by each embodiment of the present invention with reference to the drawings.

[0030] One embodiment of the present invention discloses a motor shaft, as Figures 1-3As shown, a hollow structure 1 is provided axially at at least one end of the motor shaft. When the hollow structure 1 is provided axially at one end and the other end is a solid structure or a closed structure, when hollow structures 1 are provided at both ends of the shaft, the hollow structure 1 axially penetrates the entire motor shaft. The hollow structure 1 is provided with a coolant pumping mechanism with spiral grooves 2 at a position close to the end. The coolant pumping mechanism is similar to the structure of a water pump. When the motor shaft rotates, the coolant pumping mechanism enables the coolant to enter the hollow structure 1 by relying on the attraction generated by the rotation of the motor shaft; when hollow structures 1 are provided at both ends of the shaft, the coolant pumping mechanism can be respectively provided in the hollow structures 1 at both ends of the motor shaft or only provided in the hollow structure 1 at one end of the motor shaft.

[0031] The spiral grooves 2 are provided on the inner surface of an annular member 3. The annular member 3 is fixedly assembled on the hollow structure 1. The spiral grooves 2 are machined on the annular member 3 and then the annular member 3 is assembled into the hollow structure 1, or the spiral grooves 2 are directly provided on the inner surface of the hollow structure 1. When machining the motor shaft, the spiral grooves 2 are directly machined on the inner surface of the hollow structure 1; the length of the spiral grooves 2 can be designed as required.

[0032] A number of groups of coolant channels 4 are provided radially on the motor shaft. The coolant channels 4 communicate with the hollow structure 1. When the motor shaft rotates, the oil in the hollow structure 1 is thrown out through the coolant channels 4 for cooling and lubricating the internal components of the motor housing.

[0033] In summary, in this embodiment, by providing a hollow structure 1 in the motor shaft and a coolant pumping mechanism in the hollow structure 1 to form a structure similar to a pump, when the motor shaft rotates, the coolant can enter the hollow structure 1 by relying on the attraction generated by the rotation of the motor shaft, and then be thrown out through the coolant channels 4, realizing the cooling and lubrication of the internal components of the motor housing, effectively improving the heat dissipation capacity of the motor and enhancing the continuous performance of the motor; and the motor shaft structure of the present invention is simple and easy to manufacture.

[0034] In one embodiment, as Figure 4 shown, the coolant pumping mechanism further includes a core shaft 5. The core shaft 5 is arranged inside the spiral grooves 2, at the inner diameter of the spiral grooves 2. When the motor shaft rotates, the spiral grooves 2 and the core shaft 5 can rotate relative to each other. The spiral grooves 2 and the core shaft 5 form a structure similar to a pump. When they rotate relative to each other, liquid can be pumped from one end to the other end, that is, the oil is pumped into the hollow structure 1, so that more oil enters the hollow structure 1, and at the same time, the pressure of the oil in the hollow structure 1 is increased, causing the oil to be ejected from the coolant channels 4.

[0035] In one embodiment, the mandrel 5 is fixedly connected or integrally provided with a hollow tube 6 disposed at the end. The hollow tube 6 is externally communicated with the motor shaft. The hollow tube 6 is in clearance fit with the hollow structure 1. From Figures 1-3 It can be seen that one end of the hollow tube 6 is fixedly connected to the mandrel 5, and the other end is externally communicated with the motor shaft. A plurality of radial holes are formed in the tube wall of the hollow tube 6 at a position close to the spiral groove 2. The oil in the hollow tube 6 enters the spiral groove 2 through the radial holes.

[0036] In a preferred embodiment, as Figure 1 shown, the hollow tube 6 is a horn-shaped tube. The setting of the horn-shaped tube facilitates the collection of oil, so that more oil enters the hollow structure 1. The mandrel 5 is fixedly disposed inside the horn-shaped tube on the side away from the end. From Figure 4 it can be seen that the mandrel 5 extends towards the horn mouth of the horn-shaped tube at the radial hole, so as to increase the attraction of the coolant pumping mechanism.

[0037] In one embodiment, the hollow tube 6 can be joined with an external coolant tube, and the coolant in the coolant tube directly enters the hollow tube 6; the hollow tube 6 can also extend out of the motor shaft to receive the coolant inside the motor housing. The coolant inside the motor housing can enter the hollow tube 6 by means of splash, spraying or other means. Due to the clearance fit between the hollow tube 6 and the motor shaft, the coolant inside the motor housing can also be directly sucked into the hollow structure 1 inside the motor shaft through this gap.

[0038] In one embodiment, the hollow tube 6 is fixed to the motor housing assembly. This design can make the hollow tube 6 relatively stationary when the motor shaft rotates. Since the hollow tube 6 is fixedly connected to the mandrel 5, the mandrel 5 can be kept stationary when the motor shaft rotates, realizing the relative movement between the mandrel 5 and the spiral groove 2.

[0039] In one embodiment, the clearance distance between the mandrel 5 and the spiral groove 2 in the radial direction is adjustable. The diameters of the mandrel 5 and the spiral groove 2 can be adjusted according to needs, and thus the adjustment of the radial distance between the mandrel 5 and the spiral groove 2 can be realized.

[0040] In one embodiment, as Figures 1-3 shown, when hollow structures 1 are provided at both ends of the motor shaft, the coolant pumping mechanism is provided at one end or both ends of the motor shaft, which can be set according to needs, and the coolant pumping mechanisms at both ends are the same or different. The cooling pumping mechanisms at both ends can be different in size, position or shape.

[0041] In one embodiment, as Figure 5As shown, the coolant channel 4 can be inclined or perpendicular to the axis of the motor shaft as required, and is used to cool or lubricate any one or several of the motor bearings, stator windings or rotors. When cooling and lubricating the motor bearings, the coolant channel 4 is arranged at the bearing position. When the motor shaft rotates, the oil is thrown onto the motor bearings through the coolant channel 4 here; when cooling the stator windings, the coolant channel 4 is arranged at the stator winding position. When the motor shaft rotates, the oil is thrown onto the stator windings through the coolant channel 4 here; when cooling the rotor, the coolant channel 4 is arranged at both ends of the rotor and is inclined towards the rotor. When the motor shaft rotates, the oil is thrown onto the rotor through the coolant channel 4 here.

[0042] In one embodiment, each group of coolant channels 4 includes multiple ones and is arranged on the motor shaft.

[0043] As Figure 4 As shown, an annular groove 7 is provided on the inner wall of the hollow structure 1 near the shaft end on the outer side of the spiral groove 2. The spiral groove 2 and the annular groove 7 are connected. The radial holes are arranged on the hollow tube 6 at the annular groove 7. The coolant in the hollow tube 6 enters the annular groove 7 through the radial holes, and then the coolant enters the spiral groove 2 through the annular groove 7.

[0044] In summary, the present invention discloses a motor shaft. A hollow structure is provided axially at at least one end of the motor shaft. A coolant pumping mechanism with spiral grooves is provided at a position near the shaft end of the hollow structure, so that the coolant can enter the hollow structure by relying on the attraction generated by the rotation of the motor shaft; the spiral grooves are arranged on the inner surface of the annular member, and the annular member is fixedly assembled on the hollow structure, or the spiral grooves are directly arranged on the inner surface of the hollow structure; several groups of coolant channels are provided radially on the motor shaft, and the coolant channels are communicated with the hollow structure. When the motor shaft rotates, the oil in the hollow structure is thrown out through the coolant channels for cooling the internal components of the motor housing. In the present invention, by providing the hollow structure and the coolant pumping mechanism to form a structure similar to a pump, when the motor shaft rotates, the coolant can be sucked into the hollow structure and then thrown out through the coolant channels, realizing the cooling and lubrication of the internal components of the motor housing and improving the heat dissipation capacity of the motor.

[0045] The above is only the embodiment of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, extension, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A motor shaft, characterized in that, a hollow structure is provided axially at at least one end of the motor shaft, and a coolant pumping mechanism with spiral grooves is provided at a position close to the end of the hollow structure, so that coolant can enter the hollow structure by the attraction generated by the rotation of the motor shaft; the spiral grooves are provided on the inner surface of an annular member, the annular member is fixedly assembled on the hollow structure, or the spiral grooves are directly provided on the inner surface of the hollow structure; a number of groups of coolant channels are provided radially on the motor shaft, the coolant channels are communicated with the hollow structure, and when the motor shaft rotates, the oil in the hollow structure is thrown out through the coolant channels for cooling the internal components of the motor housing; the coolant pumping mechanism further includes a core shaft, the core shaft is arranged inside the spiral grooves, and the spiral grooves and the core shaft can rotate relative to each other; the core shaft is fixedly connected or integrally provided with a hollow tube provided at the end, the hollow tube is communicated with the outside of the motor shaft, and a number of radial holes are provided on the tube wall of the hollow tube at a position close to the spiral grooves; the hollow tube is a flared tube, the core shaft is fixedly arranged inside the flared tube on the side away from the end, and the core shaft extends towards the flare opening of the flared tube at the radial holes for increasing the attraction of the coolant pumping mechanism.

2. The motor shaft according to claim 1, characterized in that, the hollow tube is joined to an external coolant tube, or the hollow tube extends out of the motor shaft for receiving the coolant inside the motor housing.

3. The motor shaft according to any one of claims 1-2, characterized in that, the hollow tube is fixed to the motor housing assembly.

4. The motor shaft according to any one of claims 1-2, characterized in that, the clearance distance between the core shaft and the spiral grooves in the radial direction is adjustable.

5. The motor shaft according to any one of claims 1-2, characterized in that, the coolant pumping mechanism is provided at one end or both ends of the motor shaft, and the coolant pumping mechanisms at both ends are the same or different.

6. The motor shaft according to any one of claims 1-2, characterized in that, the coolant channels can be inclined or perpendicular to the axis of the motor shaft as required for cooling or lubricating any one or several of the motor bearings, stator windings or rotors.

7. The motor shaft according to any one of claims 1-2, characterized in that, each group of coolant channels includes multiple ones and is evenly distributed on the motor shaft; and / or, an annular groove is provided near the shaft end outside the spiral grooves, and the coolant enters the spiral grooves through the annular groove.

Images