Oil ring type stator cooling structure

Abstract

The utility model discloses an oil ring type stator cooling structure, which is characterized in that axial oil grooves penetrating through the two ends of an iron core are distributed at intervals along the circumferential direction of the iron core, the outer surface of a shell is provided with oil inlet holes communicated with the axial oil grooves, and the oil ring type stator cooling structure further comprises oil rings which are respectively arranged at the two ends of the iron core and surround the exposed end parts of a winding, the inner end portion is located at the inner end of the circular ring, the outer end portion is located at the outer end of the circular ring and protrudes out of the outer surface of the circular ring, the end face of the inner end portion is connected to the area, located on the inner side of the axial oil groove, of the end face of the iron core in a sealed mode, and the circumferential outer surface of the outer end portion is connected with the inner surface of the shell in a sealed mode. And oil outlets facing the exposed end part of the winding are distributed on the circular ring. The oil ring type stator cooling structure is simple in oil path structure and simple and convenient to assemble, and has the advantage of saving manufacturing cost.

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. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an oil ring type stator cooling structure with 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 ring type stator cooling structure is disclosed. The stator includes a housing, an iron core installed inside the housing, and windings distributed circumferentially in stator slots of the iron core. The windings have exposed ends protruding from the iron core. The structure is characterized in that: axial oil grooves penetrating both ends of the iron core are distributed circumferentially at intervals; oil inlet holes communicating with each of the axial oil grooves are opened on the outer surface of the housing; and oil rings are also included, respectively disposed at both ends of the iron core and surrounding the exposed ends. The oil rings consist of a circular ring, an inner end located at the inner end of the circular ring, and an outer end located at the outer end of the circular ring and protruding from the outer surface of the circular ring. The end face of the inner end is sealed and connected to the area of ​​the end face of the iron core located inside the axial oil grooves; the circumferential outer surface of the outer end is sealed and connected to the inner surface of the housing; and oil outlets are distributed on the circular ring facing the exposed ends of the windings.

[0008] In one embodiment of this utility model, the outer circumferential surface of the outer end is welded to the inner surface of the outer shell, and a sealing ring groove is provided on the end face of the inner end, and a sealing ring that seals with the end face of the iron core is installed in the sealing ring groove.

[0009] In another embodiment of this utility model, the inner end is welded to the end face of the iron core, and a sealing ring groove is provided on the outer circumferential surface of the outer end, and a sealing ring that seals with the inner surface of the outer shell is installed in the sealing ring groove.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] In this invention, the outer end of the oil ring located in the second segment is positioned and stopped by the first step at the junction of the first segment and the second segment, and the outer end of the oil ring located in the fourth segment is positioned and stopped by the annular support plate of the split end cap extending into the fourth segment.

[0014] In this invention, 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.

[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 Example 1;

[0018] Figure 2 This is a schematic diagram of the iron core structure;

[0019] Figure 3 This is a schematic diagram of the left oil ring structure;

[0020] Figure 4 This is a schematic diagram of the right oil ring structure;

[0021] Figure 5 This is a schematic diagram of the structure of Example 2;

[0022] Figure 6 for Figure 5 Enlarged view of point A in the middle. Detailed Implementation

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment provides an oil ring type stator cooling structure.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] It also includes a plastic oil ring, which in this embodiment is combined with Figure 3 and Figure 4The oil ring is 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. In this embodiment, the right oil ring 220 is slightly longer than the left oil ring 210, but they have the same structure, both including a ring 201, and integrally connected to the inner end 202 at the inner end and the outer end 203 at the outer end of the ring 201. The outer end 203 has an annular convex surface 205 that radially protrudes from the outer surface of the ring 201 and is welded to the inner surface of the outer shell 110. The inner end 202 is offset radially toward the inside of the ring 201, offset to the inner side of the circumferential oil groove 121. Its end face has a sealing ring groove, and a sealing ring 204 is provided in the sealing ring groove to seal with the end face of the iron core 120, thereby making the oil ring, the inner surface of the outer shell 100 and the end face of the iron core 120 form annular oil cavities located at both ends of the iron core 120. Oil outlet holes 206 are evenly distributed along the circumference of the ring 201, facing the exposed end 131 of the winding 130. The left oil ring 210 has one ring of oil outlet holes 206, and the right oil ring 220 has two rings of oil outlet holes 206.

[0029] In this embodiment, the left oil ring 210 is installed in the second section 312, with its outer end face 203 positioned on the first step 315, and its annular convex surface 205 welded to the inner surface of the second section 312. The iron core 120 is interference-fitted into the third section 313, with its left end face positioned on the second step 316. The right oil ring 220 is installed in the fourth section 314, with its annular convex surface 205 welded to the inner surface of the fourth section. The outer end face is pressed and positioned by the annular support plate 331, which extends into the fourth section 314 by the split end cap 330.

[0030] The above is the oil ring type stator cooling structure of this embodiment. (Refer to...) Figure 1 The assembly steps are as follows:

[0031] 1. Apply welding catalyst 101 to the inner surfaces of the first section 311 and the fourth section 314 of the outer casing 110 and allow it to dry. For example, the welding catalyst can be a silane coupling agent.

[0032] 2. Heat the outer casing to 110 to 250°C.

[0033] 3. The plastic left oil ring 210, the iron core 120 with winding 130, and the plastic right oil ring 220 are sequentially installed into the second section 312, the third section 313, and the fourth section 314 of the outer casing 110. After the outer casing 110 cools down, the annular convex surface 205 of the left oil ring 210 and the annular convex surface 205 of the right oil ring 220 are welded to the inner surface of the second section 312 and the inner surface of the fourth section 314, respectively, while the iron core 120 is interference-fitted into the third section 313.

[0034] Before assembly, the sealing ring 204 is installed on the inner end of the left oil ring 210 and the inner end of the right oil ring 220.

[0035] During the assembly process, heating the outer shell 110 increases its diameter, allowing the iron core 120 to be inserted into it. Simultaneously, it melts the surfaces of the left and right oil rings 210 and 220 that contact the outer shell, thus achieving welding – a dual benefit. Therefore, the oil ring-type stator cooling structure of this invention features a simple oil circuit structure, easy assembly, and cost-effective manufacturing advantages.

[0036] Example 2

[0037] like Figure 5 and Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that the inner ends 202 of the left oil ring 210 and the right oil ring 220 are welded to the end faces of both ends of the iron core 120. The annular convex surface 205 of the left oil ring 210 and the annular convex surface 205 of the right oil ring 220 each have a sealing ring groove, and a sealing ring 204 that is aligned with the inner surface of the outer shell 110 is provided in the sealing ring groove. Other structures are the same as in Embodiment 1.

[0038] In Example 2, the inner ends 202 of the left oil ring 210 and the right oil ring 220 are welded to the iron core 120, while the outer ends 203 are sealed to the outer shell 110 through a sealing ring.

[0039] Therefore, in Embodiment 2, not only is it necessary to heat the outer shell 100 to allow the iron core 120 to be installed, but the iron core 120 also needs to be heated to achieve welding with the inner end of the oil ring. Before heating the iron core 120, a welding catalyst 101 needs to be applied to the end face of the iron core 120. Compared with Embodiment 1, the assembly of this embodiment is slightly more complex, but overall it is still simpler than the prior art.

Claims

1. An oil ring type stator cooling structure, the stator including a housing, a core mounted in the housing, and a winding distributed in a circumferential direction in a stator slot of the core, the winding having an exposed end portion exposed from the core, characterized by: The iron core is spaced in the circumferential direction and has axial oil grooves penetrating both ends of the iron core, the outer surface of the shell is provided with oil inlet holes communicating with the axial oil grooves, and the oil ring is arranged at both ends of the iron core and surrounds the exposed end portion.

2. The oil ring type stator cooling structure according to claim 1, characterized by The circumferential outer surface of the outer end portion is welded to the inner surface of the shell, and the end surface of the inner end portion is provided with a sealing ring groove.

3. The oil ring type stator cooling structure according to claim 1, characterized by The circumferential outer surface of the outer end portion is welded to the inner surface of the shell, and the end surface of the inner end portion is provided with a sealing ring groove.

4. The oil ring type stator cooling structure according to claim 2 or 3, characterized by The outer shell is an aluminum shell, the oil ring is a plastic oil ring, and the iron core is installed in the shell by interference fit.

5. The oil ring type stator cooling structure according to claim 4, characterized by The shell includes a main shell part, a connected end cover integrally connected to one end of the main shell part, and a split end cover splitly connected to the other end of the main shell part.

6. The oil ring type stator cooling structure according to claim 5, characterized by The main shell part is sequentially divided into a first section, a second section, a third section and a fourth section with increasing diameters from the connected end cover to the split end cover, the iron core is installed in the third section, and two oil rings are installed in the second section and the fourth section, respectively.

7. The oil ring type stator cooling structure according to claim 6, characterized by The outer end portion of the oil ring located in the second section is positioned and stopped by the first step at the joint of the first section and the second section, and the outer end portion of the oil ring located in the fourth section is positioned and stopped by the annular support plate of the split end cover extending into the fourth section.

8. The oil ring type stator cooling structure according to claim 1, characterized by The iron core has an annular oil groove at the axial middle position, which communicates with the oil inlet holes and the axial oil grooves.

Images