Knurled shaft, rotor assembly, motor and vehicle
By adopting a knurled shaft with a helical single-groove structure in the rotor assembly, the problem of knurling cutting the iron core is solved, achieving iron core protection and cost reduction, and improving production efficiency and friction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-20
AI Technical Summary
In the prior art, the knurling on the knurled shaft in the rotor assembly can easily cut the iron core, causing damage to the iron core. At the same time, the processing tools have high customization requirements and high costs.
The knurled shaft, which adopts a spiral single-groove structure, is manufactured using a knurling wheel to avoid sharp points and breaks, increase friction, reduce the need for custom machining tools, and lower costs.
This avoids damage to the iron core, increases friction, reduces production costs and consumables, and improves production efficiency and dimensional consistency.
Smart Images
Figure CN224021513U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to the technical field of knurled shafts, and particularly relates to a knurled shaft, a rotor assembly, a motor and a vehicle. BACKGROUND
[0002] The knurls on the knurled shaft in the rotor assembly of the related art are generally net-shaped knurls, and the net-shaped knurls have sharp points which can cut the iron core when cooperating with the iron core, and thus the iron core is easily damaged. CONTENT OF THE UTILITY MODEL
[0003] The present disclosure aims to provide a knurled shaft, a rotor assembly, a motor and a vehicle to solve the problems in the related art.
[0004] In order to achieve the above-mentioned purpose, one aspect of the present disclosure provides a knurled shaft applied to an iron core of a rotor assembly, comprising:
[0005] a shaft body,
[0006] wherein at least part of the outer circumferential surface of the shaft body is formed with knurls, the knurls comprise a single groove, the shape of the single groove is set as a spiral type, and the single groove extends from one end to the other end of the shaft body in the axial direction.
[0007] Optionally, the single groove comprises a plurality of sub-grooves, the plurality of sub-grooves are arranged around the axis of the shaft body, and the plurality of sub-grooves are connected end to end to form the single groove.
[0008] Optionally, the extension direction of each sub-groove is set as a first direction, the first direction is set at a first angle with the axial direction of the shaft body, and the first angle is an acute angle, so that each sub-groove is arranged obliquely.
[0009] Optionally, in the axial direction of the shaft body, the spacing between adjacent two circles of the sub-grooves is set as 2mm-10mm, and the first angle is set as 20°-60°.
[0010] Optionally, the first angle and the spacing between adjacent two circles of the sub-grooves are in an inverse relationship.
[0011] Optionally, the number of the single grooves is a plurality, the plurality of single grooves are arranged at intervals in the axial direction of the shaft body, and the plurality of single grooves are not connected to each other.
[0012] Optionally, in the axial direction of the shaft body, the spacing between adjacent two single grooves is set as 0.3mm-1mm, and the modulus of the knurls is 0.2mm-0.4mm.
[0013] Optionally, the groove width of each single groove is set as 0.1-0.4 times the spacing between adjacent two single grooves.
[0014] Optionally, the outer circumferential surface of the shaft body between two adjacent single grooves is provided with a rough surface, and the roughness of the rough surface is 6.3 or 3.2.
[0015] The second aspect of the present disclosure also provides a rotor assembly comprising a core and the knurled shaft as described above, wherein the core is sleeved on the knurled shaft and coaxially arranged.
[0016] The core is provided with a connecting hole, and the hole wall of the connecting hole is connected with the knurls of the knurled shaft.
[0017] The third aspect of the present disclosure also provides an electric machine comprising the rotor assembly as described above.
[0018] The fourth aspect of the present disclosure also provides a vehicle comprising the electric machine as described above.
[0019] The technical scheme described above, by arranging the spiral knurls of the single groove, the spiral knurls are a whole coherent groove structure without breakpoints and sharp points, and when cooperating with the core, the knurls will not cut the core, so as to avoid damaging the core, and at the same time, the friction force can be increased and the interference between the knurled shaft and the core can be reduced. In addition, the knurled shaft provided with the spiral knurls of the single groove does not need to be manufactured by using a thread rolling plate, but can be manufactured by using a knurling wheel, so that it is not necessary to customize the thread rolling plate to meet the processing and manufacturing of knurled shafts of different sizes, and the customization demand can be reduced, the production cost can be reduced, and the production efficiency can be improved. Moreover, the single groove is designed in a spiral type, compared with straight knurls, when processing and manufacturing, the excessive axial resistance between the knurling wheel and the knurled shaft can be avoided, so as to reduce the wear of the knurling wheel and reduce the consumption of materials, thereby saving costs and ensuring the size consistency of the formed single groove.
[0020] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0021] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and together with the specific embodiments below, serve to explain the present disclosure, but do not constitute a limitation on the present disclosure. In the drawings:
[0022] Figure 1 is a structure schematic view of a knurled shaft according to an embodiment of the present disclosure.
[0023] Figure 2 is a structure schematic view of a knurled shaft according to another embodiment of the present disclosure. Figure 1 is an enlarged schematic view of position A in FIG. 6.
[0024] Figure 3 is a structure schematic view of a knurled shaft according to another embodiment of the present disclosure.
[0025] Figure 4 is a schematic diagram of processing of a knurled shaft according to an embodiment of the present disclosure.
[0026] Figure 5 is a schematic diagram of a rotor assembly according to an embodiment of the present disclosure.
[0027] Explanation of Reference Signs
[0028] 1, shaft body;
[0029] 2, knurl;
[0030] 3, single groove, 31, sub-groove, 32, first angle;
[0031] 4, rough surface;
[0032] 41, knurl wheel, 42, helical tooth, 43, base, 44, fixed shaft, 45, accommodating groove;
[0033] 5, iron core. DETAILED DESCRIPTION
[0034] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.
[0035] In the present disclosure, "inner, outer" refers to the inner and outer of the relevant parts, unless otherwise stated. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0036] In the description of the present disclosure, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.
[0037] The knurls on the knurled shaft in the related art generally include straight knurls or mesh knurls, wherein the mesh knurls will have sharp points, which will cut the iron core when cooperating with the iron core, and easily cause damage to the iron core.
[0038] At present, some straight thread knurls are used in cooperation with the iron core to increase the friction and reduce the interference between the knurl shaft and the iron core. However, straight thread knurling requires special processing tools, which need to be custom produced. For different needs, more processing tools need to be manufactured, resulting in high cost. Special processing tools such as a thread rolling plate are used to complete straight thread knurling. The thread rolling plate has relative motion, and the knurl shaft rotates relative to the axis. This method is mainly used for mass production processing. The size of the thread rolling plate needs to be completely matched with the diameter of the knurl shaft, resulting in the need for a set of special thread rolling plate for knurl shafts of different knurl lengths, so that thread rolling plates of different lengths need to be customized according to the knurl length, resulting in high cost.
[0039] To this end, as shown in Figures 1-5 An aspect of the present disclosure provides a knurl shaft applied to an iron core 5 of a rotor assembly, comprising a shaft body 1.
[0040] Wherein at least part of the outer circumferential surface of the shaft body 1 is formed with a knurl 2, the knurl 2 comprises a single groove 3, the shape of the single groove 3 is set as a spiral type, and the single groove 3 extends from one end of the shaft body 1 in the axis direction to the other end.
[0041] Wherein the single groove 3 refers to a groove structure that penetrates from one end of the shaft body 1 in the axis direction to the other end of the shaft body 1 in the axis direction. The spiral type refers to the continuous rotation of the shaft body 1 from one end in the axis direction to the other end in the axis direction.
[0042] In the above technical solution, the spiral type knurl 2 with the single groove 3 is a whole coherent groove structure, without breakpoints and sharp points. When cooperating with the iron core 5, the iron core 5 will not be cut, and the iron core 5 will not be damaged. At the same time, the friction can be increased, and the interference between the knurl shaft and the iron core 5 can be reduced. In addition, the spiral type knurl 2 with the single groove 3 of the present knurl shaft does not need to use a thread rolling plate for manufacturing, but can be manufactured by a knurl wheel 41. Therefore, it is not necessary to customize the thread rolling plate to meet the processing and manufacturing of knurl shafts of different sizes, which can reduce the demand for customization, reduce production cost, improve production efficiency, and ensure the size consistency of the single groove 3.
[0043] Optionally, in one embodiment of the present disclosure, the single groove 3 comprises a plurality of sub-grooves 31, the plurality of sub-grooves 31 are arranged around the axis of the shaft body 1, and the plurality of sub-grooves 31 are connected end to end to form a single groove 3. By such arrangement, it is beneficial for processing and manufacturing. It can be understood that during the manufacturing and processing of the knurling 2, a plurality of sub-grooves 31 can be opened at the same time. After the plurality of sub-grooves 31 are opened, the subsequent sub-grooves 31 can be in communication with the previously opened sub-grooves 31. The sub-grooves 31 are in spiral communication, thereby forming a whole coherent single groove 3 without breakpoints, which can avoid the existence of breakpoints between the plurality of sub-grooves 31 to form an exposed structure, and avoid the cutting effect on the iron core 5.
[0044] Optionally, in one embodiment of the present disclosure, the extension direction of each sub-groove 31 is arranged as a first direction, the first direction is arranged at a first angle 32 with the axis direction of the shaft body 1, and the first angle 32 is an acute angle, so that each sub-groove 31 is arranged obliquely. By such arrangement, each sub-groove 31 is in an inclined state, and the single groove 3 formed thereby can be a whole spiral structure.
[0045] Wherein, when the knurling wheel 41 knurls the knurling shaft 2, the processed sub-groove 31 is inclined, which can reduce the axial resistance of the knurling shaft to the knurling wheel 41, reduce the damage of the knurling wheel 41, shorten the production cycle, and improve the production efficiency. It should be noted that the first angle 32 can be arranged as needed, which is not limited here, and the spacing between the adjacent two sub-grooves 31 is consistent with the spacing of the teeth on the knurling wheel 41.
[0046] Optionally, in one embodiment of the present disclosure, the spacing H between the adjacent two sub-grooves 31 in the axis direction of the shaft body 1 is arranged as 2mm-10mm, and the first angle 32 is arranged as 20°-60°.
[0047] Wherein, the first angle 32 and the spacing between the adjacent two sub-grooves 31 are in an inverse relationship, that is, the first angle 32 is small, the spacing between the adjacent two sub-grooves 31 is large, the first angle 32 is large, and the spacing between the adjacent two sub-grooves 31 is small. By such arrangement, the adjacent two sub-grooves 31 will not be too close, which can avoid the occurrence of disorder pattern of the knurling 2, and at the same time can avoid the spiral single groove 3 being too far away to affect the friction force generated by the cooperation with the iron core 5.
[0048] It can be understood that the distance between the two adjacent sub-grooves 31 is set smaller, the two adjacent sub-grooves 31 are closer, the inclination of the sub-groove 31 is smaller, that is, the first angle 32 is larger, the distance between the two adjacent sub-grooves 31 is set larger, the two adjacent sub-grooves 31 are farther apart, the inclination of the sub-groove 31 is larger, that is, the first angle 32 is smaller, but the plurality of sub-grooves 31 are connected end to end to form a single groove 3. It should be noted that the distance between the two adjacent sub-grooves 31 can be set as needed, and the specific value is not limited here.
[0049] Optionally, in an embodiment of the present disclosure, the number of single grooves 3 is a plurality, and the plurality of single grooves 3 are arranged at intervals in the axial direction of the shaft body 1, and the plurality of single grooves 3 are not communicated with each other. Among them, the cross-shaped spiral line is used to form the reticle groove, and the spiral line can be set as left-handed and right-handed, and when crossing each other, a sharp point is formed at the intersection, and a plurality of spiral lines cross each other continuously to form a reticle structure. In the embodiment of the knurling, the plurality of single grooves 3 are not communicated with each other and are not crossed, but are arranged at intervals in one direction, and there is no intersection, which is not a grid structure, so there is no sharp point, so as not to cause damage to the iron core.
[0050] In addition, the plurality of single grooves 3 can improve the density of the knurling 2, thereby improving the friction force generated by cooperating with the iron core 5.
[0051] Among them, the plurality of single grooves 3 not communicated with each other means that each single groove 3 is a continuous structure extending from one end to the other end of the shaft body 1 in the axial direction, and there is no broken situation, so there is no disorder. Each single groove 3 includes a plurality of sub-grooves 31, and the plurality of sub-grooves 31 corresponding thereto are connected end to end to form a single groove 3.
[0052] Optionally, in an embodiment of the present disclosure, in the axial direction of the shaft body 1, the distance h between the two adjacent single grooves 3 is set to 0.3mm-1mm, and the modulus of the knurling 2 is 0.2mm-0.4mm. By setting in this way, the two adjacent single grooves 3 are closer, the friction force generated by cooperating with the iron core 5 is improved, and at the same time, the knurling 2 processed does not appear disorder.
[0053] Among them, the larger the modulus of the knurling 2, the larger the distance h between the two adjacent single grooves 3; on the contrary, the smaller the modulus of the knurling 2, the smaller the distance h between the two adjacent single grooves 3, the modulus of the knurling 2 is related to the gear of the knurling wheel 41 processed, and the modulus of the knurling 2 can be set according to the diameter of the shaft body 1 and the need, which is not limited here.
[0054] It is understandable that when the distance between two adjacent single grooves 3 is small, the density of knurling 2 is high; when the distance between two adjacent single grooves 3 is large, the density of knurling 2 is lower. It should be noted that the distance between two adjacent single grooves 3 can be set as needed, and its specific value is not limited here. For example, it can be set according to the structure of the iron core 5 that needs to be matched and the diameter of the shaft 1.
[0055] Optionally, in one embodiment of this disclosure, the width of each single groove 3 is set to 0.1-0.4 times the distance between two adjacent single grooves 3. The larger the multiple, the larger the width h of each single groove 3; conversely, the smaller the width of each single groove 3. The width of each single groove 3 is related to the teeth of the knurling wheel 41 being processed, and the width of each single groove 3 can be set according to the distance between two adjacent single grooves 3 and other requirements, without further limitations.
[0056] Optionally, in one embodiment of this disclosure, the outer peripheral surface of the shaft 1 located between two adjacent single grooves 3 is configured as a rough surface 4, with a roughness of 6.3 or 3.2. This configuration further enhances the friction between the knurled shaft and the iron core 5, thereby improving stability. It should be noted that the roughness of the rough surface 4 on the outer peripheral surface of the shaft 1 located between two adjacent single grooves 3, i.e., the surface without single grooves 3, can be set as needed, without further limitation here.
[0057] like Figure 4 As shown, optionally, in one embodiment of this disclosure, the knurling 2 is formed by friction processing using a knurling wheel 41. The knurling wheel 41 can be positioned on one side of the shaft 1. The shaft 1 is rotated about its axis, and the knurling wheel 41 and / or the shaft 1 are moved relative to each other along a first direction, so that the knurling wheel 41 processes the outer peripheral surface of the shaft 1. The first direction is parallel to the axis of the shaft 1. The friction between the knurling wheel 41 and the outer peripheral surface of the shaft 1 enables the processing of the outer peripheral surface of the shaft 1, thereby forming the knurling 2.
[0058] In this process, the knurling wheel 41 and / or the shaft 1 are moved relative to each other along a first direction. That is, the knurling wheel 41 can move while the shaft 1 remains stationary, or the shaft 1 can move while the knurling wheel 41 remains stationary. Thus, the knurling wheel 41 can machine different positions on the outer circumferential surface of the shaft 1 in the axial direction. Alternatively, both the knurling wheel 41 and the shaft 1 can move. It should be noted that when both the knurling wheel 41 and the shaft 1 move, there is relative motion between them, and the knurling wheel 41 can machine different positions on the outer circumferential surface of the shaft 1 in the axial direction.
[0059] In some examples, the knurling wheel 41 is a helical knurling wheel, that is, the knurling wheel 41 is provided with a helical tooth 42, the extension direction of the helical tooth 42 is arranged at a second angle with the axis of the knurling wheel 41, and the second angle is an acute angle. By arranging the helical tooth 42, it is more beneficial to generate the knurls 2 of the single groove 3 in the form of a spiral on the shaft body 1.
[0060] The knurling wheel 41 is rotationally connected to the base 43, and the knurling wheel 41 can rotate relative to the base 43, so that after the knurling wheel 41 cooperates with the shaft body 1, the helical tooth 42 can process the outer circumferential surface of the shaft body 1 under the action of friction to form the knurls 2. It can be understood that the outer circumferential wall of the knurling wheel 41 protrudes from the base 43, which is beneficial to contact with the shaft body 1, and can avoid interference of the base 43, so that the helical tooth 42 can be conveniently contacted with the shaft body 1. The base 43 is provided with a receiving groove 45, and the fixing shaft 44 is arranged in the receiving groove 45 and connected with the groove wall of the receiving groove 45, and the knurling wheel 41 is rotatably sleeved on the fixing shaft 44 and located in the receiving groove 45.
[0061] It can be understood that the second angle can be the same as the first angle 32, so that the outer circumferential wall of the knurling wheel 41 is in positive relation with the outer circumferential surface of the shaft body 1, so that the outer circumferential wall of the knurling wheel 41 is in full contact with the outer circumferential surface of the shaft body 1.
[0062] Optionally, in an embodiment of the present disclosure, the material of the shaft body 1 includes 40Cr, 20MnCr5 or 20CrMnTi.
[0063] The second aspect of the present disclosure also provides a rotor assembly, which comprises the knurled shaft and a core 5, and the core 5 is coaxially sleeved on the knurled shaft. The core 5 is provided with a connecting hole penetrating in the axial direction, and the knurled shaft is arranged in the connecting hole, and the hole wall of the connecting hole is connected with the knurls 2 of the knurled shaft.
[0064] The third aspect of the present disclosure also provides an electric machine, which comprises the rotor assembly.
[0065] The fourth aspect of the present disclosure also provides a vehicle, which comprises the electric machine.
[0066] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
[0067] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not describe various possible combinations again.
[0068] Furthermore, the various embodiments of the present disclosure can be arbitrarily combined with each other unless they contradict each other, and it should be understood that the same should be construed as being included in the disclosure of the present disclosure.
Claims
1. A knurled shaft, used in the core of a rotor assembly, characterized in that, include: Shaft body, The shaft body has at least a portion of its outer peripheral surface knurled, the knurling including a single groove, the single groove being spiral in shape, and the single groove extending from one end of the shaft body to the other end in the axial direction.
2. The knurled shaft according to claim 1, characterized in that, The single groove includes multiple sub-grooves, which are arranged around the axis of the shaft and connected end to end to form a single groove.
3. The knurled shaft according to claim 2, characterized in that, The extension direction of each of the sub-grooves is set as a first direction, which is set at a first angle to the axial direction of the shaft body. The first angle is an acute angle, so that each of the sub-grooves is inclined.
4. The knurled shaft according to claim 3, characterized in that, In the axial direction of the shaft, the spacing between two adjacent sub-grooves is set to 2mm-10mm, and the first angle is set to 20°-60°. The first angle is inversely related to the spacing between the two adjacent sub-grooves.
5. The knurled shaft according to claim 1, characterized in that, The number of single grooves is multiple, and the multiple single grooves are spaced apart in the axial direction of the shaft body. The multiple single grooves are not connected to each other; the distance between two adjacent single grooves is set to 0.3mm-1mm, and the knurling module is 0.2mm-0.4mm.
6. The knurled shaft according to claim 5, characterized in that, The width of each slot is set to 0.1-0.4 times the distance between two adjacent slots.
7. The knurled shaft according to claim 1, characterized in that, The outer circumferential surface of the shaft located between two adjacent single grooves is set as a rough surface, and the roughness of the rough surface is 6.3 or 3.
2.
8. A rotor assembly, characterized in that, Includes an iron core and a knurled shaft as described in any one of claims 1-7, wherein the iron core is sleeved on the knurled shaft and coaxially arranged; The iron core is provided with a connecting hole, and the wall of the connecting hole is connected to the knurling of the knurled shaft.
9. An electric motor, characterized in that, Includes the rotor assembly as described in claim 8.
10. A vehicle, characterized in that, Includes the motor as described in claim 9.