Split type spline motor shaft
Through the integrated structure and welding structure of the split flower bond motor, combined with quality adjustment and carburizing treatment, the existing motor shaft processing and production efficiency are low, high accuracy, high cost and long production cycle, and realized efficient and efficient and long production cycle. Reliable torque transfer and reduce production costs.
Patent Information
- Application Number
- CN202421388545.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-06-18
AI Technical Summary
In the processing and production process, existing motor shafts have problems such as low efficiency, low accuracy, high cost and long production cycle. Especially in new energy vehicle motors, due to frequent torque impacts and insufficient strength of external spline shafts, they need to be high. Quality materials and forging processes to increase strength, but this increases production cycle and cost.
Adopt a split flower bond motor axis design, the motor shaft body and the flower key are separated, and the integrated structure of the welding of the electron beam is to increase the connection strength at the coordination of the seams and the proliferation. Improve processing efficiency, the motor axis body adopts quality adjustment treatment, and the ends of the flower bond adopt carburizing treatment to reduce costs and improve processing convenience.
The processing efficiency and accuracy of the motor shaft have been improved, the cost of heat treatment is reduced, the production cycle is shortened, the security and reliability of torque transmission is enhanced, and the cost of the flower keys shaft is reduced.
Smart Images
Figure CN222415619U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a split spline motor shaft and belongs to the technical field of motors. Background Art
[0002] Motors provide power sources for various industries. The power of motors is mainly output through motor shafts. The output of motor shaft power is mainly connected to other equipment by means of flat keys, tension sleeves, shrink-fit flanges, internal and external splines, etc. In order to ensure the stability and reliability of motor power output, permanent magnet motors for new energy vehicles usually use internal and external splines.
[0003] When the motor shaft adopts an internal spline shaft, since most of the internal spline shafts are blind holes, firstly, the diameter of the bottom hole of the internal spline is small, the hole is relatively deep, and the processing efficiency is low; secondly, the internal spline processing of the blind hole can only be carried out by the gear shaping process, which has low gear shaping efficiency and low spline precision; then the spline shaft needs to be carburized and straightened as a whole, the heat treatment cost is high, and the straightening efficiency is low; finally, the outer circle hardness of the spline shaft after carburization is high, the processing difficulty is high, the efficiency is low, and the tool wear is large.
[0004] However, when the operating conditions of new energy vehicle motors are complex and the torque impact is frequent and severe, since the diameter of the external spline motor shaft is smaller than the matching internal spline shaft, the strength of the external spline shaft is relatively weak. Therefore, such external spline motor shafts need to select high-quality materials and combine forging technology to improve the strength of the external spline shaft. The use of high-quality materials and forging technology greatly increases the production time and production cycle of the spline shaft, so new solutions need to be proposed to solve the above problems. Utility Model Content
[0005] The utility model aims to provide a split spline motor shaft in order to overcome the deficiencies of the prior art.
[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a split spline motor shaft, comprising a motor shaft body and a spline end, wherein the spline end is provided with a spline structure; the spline end is interference fit with the motor shaft body, and the spline end and the motor shaft body are made into an integrated structure through electron beam welding, and a weld is formed between the spline end and the motor shaft body; a keyway is opened on the motor shaft body, and a pin is provided at the connection between the spline end and the motor shaft body, and the pin is located at the bottom of the keyway.
[0007] Preferably, the spline structure on the spline end is an internal spline structure, the inner circumferential wall of the spline end is interference fit with the outer circumferential wall of the end of the motor shaft body, and they are formed into an integrated structure through electron beam welding.
[0008] Preferably, two pins are provided, one of which is driven into the weld between the spline end and the motor shaft body, and the other pin is driven into the interference fit between the spline end and the motor shaft body.
[0009] Preferably, the diameter of the pin is equal to the width of the keyway, and the maximum outer diameter of the spline end is greater than the maximum outer diameter of the motor shaft body.
[0010] Preferably, the spline structure on the spline end is an external spline structure, and the outer circumferential wall of the spline end is interference fit with the inner circumferential wall of the end of the motor shaft body, and is formed into an integrated structure by electron beam welding.
[0011] Preferably, two pins are provided, one of which is driven into the connecting end face between the spline end and the motor shaft body, and the other pin is driven into the interference fit between the spline end and the motor shaft body, and the length of the pin at the connecting end face is greater than the length of the pin at the interference fit.
[0012] Preferably, the diameter of the pin is equal to the width of the keyway, and the maximum outer diameter of the motor shaft body is greater than the maximum outer diameter of the spline end.
[0013] Preferably, the motor shaft body is subjected to a quenching and tempering treatment.
[0014] Preferably, the spline end is carburized.
[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:
[0016] 1. By setting the motor shaft and the spline end separately, and the motor shaft body is quenched and tempered, the heat treatment cost is low, the outer circle hardness of the shaft is low, which is convenient for processing. The spline end does not need to be straightened after carburizing, which improves the processing efficiency.
[0017] 2. By adding pins at the weld and interference fit between the spline end and the motor shaft body, the safety and reliability of the torque transmission of the motor shaft can be improved.
[0018] 3. By setting the spline end as a through hole, it is convenient to process the inner spline bottom hole. At the same time, the processing method of the through hole inner spline structure can be changed from traditional gear shaping to spline drawing by a broaching machine, which greatly improves the processing efficiency and accuracy.
[0019] 4. The spline end uses high-quality materials and forging technology to ensure the strength of the spline shaft. Since the amount of high-quality materials used is small, it is conducive to advance material preparation, reducing the cost of the spline shaft and shortening the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:
[0021] Attached Figure 1 This is a structural schematic diagram of Embodiment 1 of a split spline motor shaft according to the utility model;
[0022] Attached Figure 2 For attachment Figure 1 AA section view;
[0023] Attached Figure 3 This is a structural schematic diagram of Embodiment 2 of a split spline motor shaft according to the utility model;
[0024] Attached Figure 4 For attachment Figure 3 AA section view.
[0025] In the figure: 1. Motor shaft body; 2. Spline end; 3. Weld; 4. Keyway; 5. Pin; 6. Internal spline structure; 7. External spline structure. DETAILED DESCRIPTION
[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Figure 1-4 As shown, it includes a motor shaft body 1 and a spline end 2, and a spline structure is arranged on the spline end 2; the spline end 2 is interference fit with the motor shaft body 1, and the spline end 2 and the motor shaft body 1 are made into an integrated structure by electron beam welding, and a weld 3 is formed between the spline end 2 and the motor shaft body 1; a pin 5 is arranged at the connection between the spline end 2 and the motor shaft body 1, and the pin 5 is located at the bottom of the keyway 4.
[0027] Example 1
[0028] As attached Figure 1 , 2 As shown, the spline structure on the spline end 2 is an internal spline structure 6, and the inner circumferential wall of the spline end 2 is interference fit with the outer circumferential wall of the end of the motor shaft body 1. In this embodiment, the spline end 2 and the motor shaft body 1 are interference fit by shrink sleeve, and are integrated into a structure by electron beam welding, wherein the spline end 2 is carburized, and the spline end 2 does not need to be straightened after carburizing, and the motor shaft body 1 is quenched and tempered, the heat treatment cost is low, and the outer circle hardness of the shaft is low, so as to facilitate processing; the spline end 2 and the motor shaft body 1 are provided with a connection Pin 5, two pins 5 are provided, and the diameter of pin 5 is equal to the width of keyway 4 to ensure that pin 5 can be smoothly driven into keyway 4, one pin 5 is driven into the weld 3 between spline end 2 and motor shaft body 1, and the other pin 5 is driven into the interference fit between spline end 2 and motor shaft body 1. By adding pin 5 at the weld 3 and interference fit between spline end 2 and motor shaft body 1, the safety and reliability of torque transmission of motor shaft can be improved; the maximum outer diameter of spline end 2 is larger than the maximum outer diameter of motor shaft body 1.
[0029] In this embodiment, the spline end 2 is in the form of a through hole to facilitate the processing of the inner spline bottom hole. At the same time, the processing method of the through hole inner spline structure 6 can be changed from traditional gear shaping to spline drawing by a broaching machine, which greatly improves the processing efficiency and accuracy.
[0030] Example 2
[0031] As attached Figure 3 , 4 As shown, the spline structure on the spline end 2 is an external spline structure 7, the outer circumferential wall of the spline end 2 is interference fit with the inner circumferential wall of the end of the motor shaft body 1, and is formed into an integrated structure by electron beam welding, wherein the motor shaft body 1 is subjected to quenching and tempering treatment, the heat treatment cost is low, the outer circle hardness of the shaft is low, and it is easy to process, and the spline end 2 does not need to be straightened after carburizing treatment; two pins 5 are provided, and the diameter of the pin 5 is equal to the width of the keyway 4, one of the pins 5 is driven into the connecting end face of the spline end 2 and the motor shaft body 1, and the other pin 5 is driven into the interference fit between the spline end 2 and the motor shaft body 1, and the length of the pin 5 at the connecting end face is greater than the length of the pin 5 at the interference fit, thereby improving the safety and reliability of the torque transmission of the motor shaft; the maximum outer diameter of the motor shaft body 1 is greater than the maximum outer diameter of the spline end 2.
[0032] In this embodiment, the spline end 2 is made of high-quality materials and forging technology to ensure the strength of the spline shaft. Since the amount of high-quality materials is small, it is beneficial to prepare materials in advance, reduce the cost of the spline shaft, and shorten the production cycle.
[0033] The above are only specific application examples of the utility model and do not constitute any limitation to the protection scope of the utility model; any technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the utility model.
Claims
1. A split spline motor shaft, characterized in that: The invention comprises a motor shaft body (1) and a spline end (2), wherein the spline end (2) is provided with a spline structure; the spline end (2) and the motor shaft body (1) are interference fit, and the spline end (2) and the motor shaft body (1) are integrated into an integral structure by electron beam welding, and a weld (3) is formed between the spline end (2) and the motor shaft body (1); a keyway (4) is provided on the motor shaft body (1), and a pin (5) is provided at the connection between the spline end (2) and the motor shaft body (1), and the pin (5) is located at the bottom of the keyway (4).
2. A split spline motor shaft according to claim 1, characterized in that: The spline structure on the spline end (2) is an internal spline structure (6); the inner peripheral wall of the spline end (2) is interference-fitted with the outer peripheral wall of the end of the motor shaft body (1), and are formed into an integrated structure through electron beam welding.
3. A split spline motor shaft according to claim 2, characterized in that: Two pins (5) are provided, one of which is driven into the weld (3) between the spline end (2) and the motor shaft body (1), and the other pin is driven into the interference fit between the spline end (2) and the motor shaft body (1).
4. A split spline motor shaft according to claim 3, characterized in that: The diameter of the pin (5) is equal to the width of the keyway (4), and the maximum outer diameter of the spline end (2) is greater than the maximum outer diameter of the motor shaft body (1).
5. The split spline motor shaft according to claim 1, characterized in that: The spline structure on the spline end (2) is an external spline structure (7), the outer peripheral wall of the spline end (2) is interference-fitted with the inner peripheral wall of the end of the motor shaft body (1), and are formed into an integrated structure through electron beam welding.
6. A split spline motor shaft according to claim 5, characterized in that: Two pins (5) are provided, one of which is driven into the connection end face between the spline end (2) and the motor shaft body (1), and the other pin (5) is driven into the interference fit between the spline end (2) and the motor shaft body (1), and the length of the pin (5) at the connection end face is greater than the length of the pin (5) at the interference fit.
7. A split spline motor shaft according to claim 6, characterized in that: The diameter of the pin (5) is equal to the width of the keyway (4), and the maximum outer diameter of the motor shaft body (1) is greater than the maximum outer diameter of the spline end (2).
8. A split spline motor shaft according to any one of claims 1 to 7, characterized in that: The motor shaft body (1) is subjected to a quenching and tempering treatment.
9. A split spline motor shaft according to any one of claims 1 to 7, characterized in that: The spline end (2) is carburized.