Oil cooling stator structure
By employing an axial oil groove and oil ring structure in the stator structure, combined with the interference fit between the aluminum shell and the plastic oil ring, the problems of complex oil circuits and cumbersome assembly in existing oil cooling technologies are solved, achieving the effect of simplifying oil circuit design and reducing costs.
Patent Information
- Application Number
- CN202423062560.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Existing oil cooling technology has a complex oil circuit structure, is cumbersome to assemble, has high manufacturing costs, and makes it difficult to achieve uniform cooling of the stator.
It adopts an axial oil groove and oil ring structure. The oil ring is composed of an inner ring, an outer ring and an annular connecting plate, which are welded to the end face of the iron core. Combined with the interference fit of the aluminum shell and the plastic oil ring, the oil circuit design is simplified.
This design simplifies the oil circuit structure, simplifies assembly, reduces manufacturing costs, and improves the cooling effect of the stator.
Smart Images
Figure CN223967707U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor technology, and relates to the stator of an electric motor, and more particularly to an oil ring type stator cooling structure. Background Technology
[0002] In recent years, the development of new energy vehicles has been rapid, and industry competition has become increasingly fierce. As the heart of new energy vehicles, the motor occupies a core position. In order to gain a competitive advantage, major manufacturers are committed to finding ways to improve the power density of motors.
[0003] The common methods to increase the power density of an electric motor are to increase its speed and improve cooling conditions. Increasing motor speed is often limited by factors such as bearings, oil seals, and the speed ratio of the matching reducer, making breakthroughs difficult. However, improving cooling conditions, especially using oil cooling to dissipate heat from the motor windings, is significantly effective in increasing the motor's power density.
[0004] However, existing oil cooling technology often employs complex oil circuit structures and is cumbersome and difficult to assemble in order to achieve uniform cooling of the stator, resulting in relatively high manufacturing costs. Summary of the Invention
[0005] The technical problem to be solved by this utility model is to provide an oil-cooled stator structure with a simple oil circuit structure, easy assembly and low manufacturing cost, so as to overcome the shortcomings of the existing technology.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] An oil-cooled stator structure is disclosed, the stator comprising a housing, an iron core installed within the housing, and windings distributed circumferentially in stator slots of the iron core, the windings having exposed ends protruding from the iron core. The stator is characterized by: axial oil grooves spaced circumferentially through both ends of the iron core; an oil inlet hole communicating with each of the axial oil grooves on the outer surface of the housing; and oil rings respectively disposed at both ends of the iron core and surrounding the exposed ends. Each oil ring is integrally formed by an inner ring, an outer ring, and an annular connecting plate connecting the outer end of the inner ring and the outer end of the outer ring. The inner ends of the inner ring and the outer ring are welded to the end faces of the iron core and are respectively located inside and outside the axial oil grooves. Oil outlet holes are distributed circumferentially on the inner ring facing the exposed ends.
[0008] In this invention, the annular connecting plate has an outer flange protruding from the outer surface of the outer ring, and the outer flange is engaged on the first step of the outer shell.
[0009] In this invention, the inner end of the outer ring has an outer ring end foot with a thickness greater than the thickness of the outer ring, and the inner end of the inner ring has an inner ring end foot with a thickness greater than the thickness of the inner ring. Using relatively thick outer and inner ring end feet increases the contact area with the iron core end face, thereby improving the welding strength.
[0010] In this invention, the inner end of the inner ring is connected to the inner ring end foot via an inwardly inclined annular plate. This causes the inner ring end foot to shift inward, allowing the cooling oil in the axial oil groove to flow more smoothly into the oil ring.
[0011] In this invention, the outer shell is an aluminum shell, the oil ring is a plastic oil ring, and the iron core is installed inside the outer shell by an interference fit.
[0012] In this utility model, the outer shell includes a main shell portion, an integral end cap integrally connected to one end of the main shell portion, and a separate end cap separately connected to the other end of the main shell portion.
[0013] In this utility model, the main body shell is divided into a first section, a second section, a third section, and a fourth section with progressively increasing diameters from the integrated end cap to the split end cap. The iron core is installed in the third section, and the two oil rings are installed in the second section and the fourth section, respectively.
[0014] In this invention, the outer edge of the annular connecting plate of the oil ring in the second segment is positioned and stopped by a first step at the junction of the first and second segments. In this invention, the iron core has an annular oil groove at its axial midpoint, connecting the oil inlet hole and each of the axial oil grooves.
[0015] By adopting the above technical solution, the oil circuit structure of the oil ring stator cooling structure of this utility model is simple and easy to assemble, and has the advantage of saving manufacturing costs. Attached Figure Description
[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0017] Figure 1 This is a schematic diagram of the structure of the utility model;
[0018] Figure 2 for Figure 1 Enlarged diagram of point A in the middle. Detailed Implementation
[0019] like Figure 1 and Figure 2 As shown, this utility model provides an oil ring type stator cooling structure.
[0020] Among them, combined Figure 2 As shown, the stator 100 includes a housing 110, an iron core 120 installed inside the housing 100, and windings 130 distributed circumferentially in stator slots of the iron core 120. The windings 130 have exposed ends 131 protruding from both ends of the iron core 120. The iron core 120 has axial oil grooves 121 spaced circumferentially through both ends. An annular oil groove 122, connecting the various axial oil grooves 121, is provided at the axial midpoint of the iron core 120. An oil inlet hole 111, communicating with the annular oil groove 122, is provided on the outer surface of the housing 110.
[0021] In this embodiment, the outer casing 110 is an aluminum casing, including a main casing 310, an integral end cap 320 integrally connected to one end of the main casing 310, and a separate end cap 330 separately connected to the other end of the main casing 310 by bolts. The interior forms a space for mounting the iron core 120 and the winding 130. Both the integral end cap 320 and the separate end cap 330 have a central shaft hole 112 through which the rotor shaft passes.
[0022] The main body shell 310 is divided into a first section 311, a second section 312, a third section 313, and a fourth section 314 from the integral end cap 320 to the separate end cap 330. The diameters of the first section 311, the second section 312, the third section 313, and the fourth section 314 increase sequentially. A first step 315 is formed at the junction of the first section 311 and the second section 312, and a second step 316 is formed at the junction of the second section 312 and the second section 313.
[0023] The system also includes plastic oil rings. In this embodiment, the oil rings are divided into a left oil ring 210 located in the second segment 312 and a right oil ring 220 located in the fourth segment 314, both of which surround the exposed end 131 of the winding 130. In this embodiment, the right oil ring 220 is slightly longer than the left oil ring 210. When both have the same structure, they both include an inner ring 201, an outer ring 202, and an annular connecting plate 203 integrally connected between the outer ends of the inner ring 201 and the outer ends of the outer ring 202. The annular connecting plate 203 has an outer flange 204 protruding from the outer surface of the outer ring 202. The inner end of the outer ring 202 has a thickened outer ring end foot 205, and the inner end of the inner ring 201 is connected to a thickened inner ring end foot 207 via an annular inclined plate 206. The outer ring end 205 and the inner ring end 207 are respectively located on the outer and inner sides of the axial oil groove 121, and are both welded to the end face of the iron core 120, thus forming an annular oil cavity inside the oil ring. The inner ring 201 has oil outlets 208 evenly spaced circumferentially towards the exposed end 131 of the winding 130. The left oil ring 210 has one ring of oil outlet holes 208, and the right oil ring 220 has two rings of oil outlet holes 208.
[0024] In this embodiment, the left oil ring 210 is installed in the second section 312, and the outer flange 204 of its annular connecting plate 203 is positioned on the first step 315. The iron core 120 is interference-fitted in the third section 313, and its left end face is positioned on the second step 316. The right oil ring 220 is installed in the fourth section 314.
[0025] In this utility model, the oil-cooled stator structure allows cooling oil to enter the annular oil groove 122 of the iron core 120 through the oil inlet 111, and then flow along the oil grooves 121 along each axis to the oil rings at both ends of the iron core. Finally, the oil is sprayed through the oil outlet 208 onto the exposed end 131 of the winding 130 to carry away the heat on the winding, thereby achieving cooling of the winding 130.
[0026] The above is the oil-cooled stator structure of this embodiment. (Refer to...) Figure 1 The assembly steps are as follows:
[0027] 1. Apply welding catalyst 101 to both ends of the iron core 120 and allow it to dry. For example, in this embodiment, a silane coupling agent is selected as the welding catalyst.
[0028] 2. Heat the iron core of the heating element to 120-250°C, and install the left plastic oil ring 210 and the right plastic oil ring 220 at both ends of the iron core respectively. After cooling, the welding is completed. The left and right oil rings cover the axial oil groove 121.
[0029] 3. Finally, the iron core with oil ring is interference-fitted into the outer casing.
[0030] In this invention, the oil ring is directly welded to the end face of the iron core, and a sealing ring is not required between the oil ring and the iron core to achieve a seal between them.
[0031] As can be seen from the above detailed description, the oil circuit structure of the oil-cooled stator structure of this utility model is simple and easy to assemble, and has the advantage of saving manufacturing costs.
Claims
1. An oil-cooled stator structure, the stator comprising a housing, an iron core mounted within the housing, and windings distributed circumferentially through stator slots in the iron core, the windings having exposed ends protruding from the iron core, characterized in that: The iron core has axial oil grooves distributed at intervals along the circumferential direction, penetrating both ends of the iron core. The outer surface of the outer shell has oil inlet holes that connect to each of the axial oil grooves. It also includes oil rings respectively located at both ends of the iron core and surrounding the exposed ends. The oil rings have an inner ring and an outer ring. An annular connecting plate connecting the outer end of the inner ring and the outer end of the inner ring are integrally formed. The inner end of the inner ring and the inner end of the outer ring are both welded to the end face of the iron core and are located on the inner and outer sides of the axial oil grooves, respectively. The inner ring has oil outlet holes distributed circumferentially toward the exposed ends.
2. The oil-cooled stator structure according to claim 1, characterized in that, The annular connecting plate has an outer flange that protrudes from the outer surface of the outer ring.
3. The oil-cooled stator structure according to claim 2, characterized in that, The inner end of the outer ring has an outer ring end foot with a thickness greater than the thickness of the outer ring, and the inner end of the inner ring has an inner ring end foot with a thickness greater than the thickness of the inner ring.
4. The oil-cooled stator structure according to claim 3, characterized in that, The inner end of the inner ring is connected to the inner ring end foot by an inwardly inclined annular plate.
5. The oil-cooled stator structure according to claim 1, characterized in that, The outer casing is made of aluminum, the oil ring is made of plastic, and the iron core is installed inside the outer casing with an interference fit.
6. The oil-cooled stator structure according to claim 1, characterized in that, The outer shell includes a main shell portion, an integral end cap integrally connected to one end of the main shell portion, and a separate end cap separately connected to the other end of the main shell portion.
7. The oil-cooled stator structure according to claim 6, characterized in that, The main body shell is divided into four sections with increasing diameters from the integrated end cap to the split end cap: a first section, a second section, a third section, and a fourth section. The iron core is installed in the third section, and the two oil rings are installed in the second and fourth sections, respectively.
8. The oil-cooled stator structure according to claim 7, characterized in that, The outer edge of the annular connecting plate of the oil ring in the second segment is positioned and stopped by the first step at the junction of the first and second segments.
9. The oil-cooled stator structure according to claim 1, characterized in that, The iron core has an annular oil groove at the axial middle position that connects the oil inlet hole and each of the axial oil grooves.