Motor end cover and motor thereof
By designing multiple limit grooves and grooves on the bearing chamber interior wall of the motor end cover, and combining the annular flange of the insulator formed by injection molding or glue to form the insulator with the bearing chamber interior wall, the poor connection between the insulator sleeve and the end cover is solved. The problem is that the blocking effect of shaft current is improved and maintenance costs are reduced.
Patent Information
- Application Number
- CN202420908353.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-29
AI Technical Summary
In the prior art, the connection structure between the insulating sleeve and the motor end cover leads to poor fit between the insulating sleeve and the bearing chamber interior wall, affecting the blocking effect of shaft current and increasing maintenance costs.
The bearing chamber interior walls of multiple axial limit grooves and radial limit grooves are designed, combining annular projections and grooves. The insulator is closely combined with the bearing chamber interior wall through injection molding or glue filling, and the annular flange of the insulator is embedded. In the ring groove of the bearing chamber, the outer axial convex ribs are embedded in the axial limiting groove of the bearing chamber, and the outer radial convex ribs are embedded in the radial limiting groove to form a tight connection.
Ensure the tight fit between the insulator and the motor end cover, improve the blocking effect of shaft current and reduce maintenance and manufacturing costs.
Smart Images
Figure CN222282934U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a motor end cover and a motor thereof. Background Art
[0002] In medium and large DC motors and variable frequency motors, shaft currents are easily generated between the motor end caps, bearings, and rotating shafts. As the motor power and speed increase, the shaft currents also increase, which can seriously affect the service life of the bearings and motors, pose safety hazards during use, and reduce the reliability of the motor. In the prior art, insulating bearings are usually used to cut off the loop that forms the shaft current, but insulating bearings are expensive, and the bearings themselves are prone to wear and tear. They need to be replaced frequently during use, which increases manufacturing and maintenance costs.
[0003] The utility model patent with announcement number CN203883594U discloses "a motor end cover and a plastic-sealed motor using the same". In this patent, an insulating sleeve is nested in the bearing chamber of the end cover, and the insulating sleeve is used to block the path of the shaft current. Compared with the solution using insulating bearings, its manufacturing cost is greatly reduced. In this patent, a plurality of through holes are opened around the bearing chamber of the end cover, and an annular flange is set on the edge of the insulating sleeve. A plurality of convex columns are formed on the annular flange. The insulating sleeve is embedded in the through hole of the end cover through the convex columns to realize the assembly of the two. In this patent, the connection point between the insulating sleeve and the end cover is set outside the bearing chamber, which will result in poor fit between the insulating sleeve and the inner wall of the bearing chamber. Utility Model Content
[0004] The utility model further optimizes the connection structure between the insulating sleeve and the end cover in the prior art, ensures that the insulating sleeve can fit tightly with the inner wall of the bearing chamber of the end cover and is not easily separated, so that the insulating sleeve and the end cover are combined into one.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A motor end cover comprises a bearing chamber arranged on one side of the inner wall of the end cover and an insulator arranged inside the bearing chamber; a plurality of axial limit grooves are formed at intervals on the inner wall of the bearing chamber, an annular radial limit groove is also formed on the inner wall of the bearing chamber, an annular protrusion is formed on the bottom surface of the bearing chamber, a concave annular groove is formed on the bottom surface of the outer ring of the protrusion, and the axial limit groove is respectively connected with the radial limit groove and the annular groove; the insulator comprises an annular body, a plurality of spaced outer axial ribs and annular outer radial ribs are respectively formed on the outer wall of the annular body, and the edge of the annular body facing the side of the bottom surface of the bearing chamber extends toward the axis to form an annular flange of the insulator; the annular flange of the insulator is embedded in the annular groove of the bearing chamber, the outer axial rib of the insulator is embedded in the axial limit groove of the bearing chamber, and the outer radial rib of the insulator is embedded in the radial limit groove of the bearing chamber.
[0007] Furthermore, at least two radial limit grooves are provided on the inner wall of the bearing chamber, one of which is close to the open end of the bearing chamber, and the other is close to the bottom surface of the bearing chamber and connected with the annular groove; the number and position of the outer radial ribs on the insulator correspond to the radial limit grooves in the bearing chamber.
[0008] Furthermore, a glue injection hole is provided on the motor end cover, and the glue injection hole is communicated with the inner cavity of the bearing chamber.
[0009] Furthermore, the motor end cover also includes a bearing steel sleeve arranged inside the bearing chamber, and the insulator is clamped between the inner wall of the bearing chamber and the outer wall of the bearing steel sleeve. The insulator is formed by injection molding or glue pouring to connect the bearing steel sleeve and the bearing chamber as a whole.
[0010] Furthermore, the bearing steel sleeve includes an annular steel sleeve body, and a plurality of spaced axial grooves and annular radial grooves are respectively formed on the outer wall of the steel sleeve body, and the edge of the steel sleeve body facing the bottom surface of the bearing chamber extends toward the axis to form an annular flange of the steel sleeve; a plurality of spaced inner axial ribs and annular inner radial ribs are formed on the inner wall of the annular body of the insulator; the inner axial rib is embedded in the axial groove of the bearing steel sleeve, and the inner radial rib is embedded in the radial groove of the bearing steel sleeve, and the annular flange of the insulator covers the annular flange of the steel sleeve.
[0011] Furthermore, the glue injection holes include a first glue injection hole arranged at the annular groove on the bottom surface of the bearing chamber, and a second glue injection hole arranged at the open end surface of the bearing chamber, and the first glue injection hole and the second glue injection hole are both connected to the outer wall of the motor end cover; a steel sleeve notch is provided on the steel sleeve annular flange of the bearing steel sleeve, and the steel sleeve notch is connected to the first glue injection hole; a through hole is provided on the annular flange of the insulator, and the through hole is respectively connected to the steel sleeve notch and the first glue injection hole, and an insulator notch is provided on the end surface of the annular body away from the side of the annular flange of the insulator, and the insulator notch is connected to the second glue injection hole.
[0012] The utility model also discloses a motor, comprising the motor end cover and a bearing, wherein the bearing is located in the inner cavity of a bearing chamber, and an insulator is located between the inner wall of the bearing chamber and the outer wall of the bearing.
[0013] The motor end cover designed by the utility model forms an insulator inside the bearing chamber by injection molding or glue pouring, and uses the insulator to block the path of the shaft current. The connection structure design between the insulator and the motor end cover is more reasonable than the method mentioned in the above-mentioned prior art, which can ensure that the insulator fits tightly on the inner wall of the bearing chamber, and the two are not easy to separate, thereby effectively improving the blocking effect of the shaft current. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 Schematic diagram of the assembly structure of the motor end cover assembly in the embodiment;
[0015] Figure 2 for Figure 1 A cross-sectional view of
[0016] Figure 3 This is a schematic diagram of the front structure of the motor end cover;
[0017] Figure 4 This is a schematic diagram of the reverse structure of the motor end cover;
[0018] Figure 5 It is a cross-sectional view of the motor end cover;
[0019] Figure 6 It is a schematic diagram of the front structure of the insulator;
[0020] Figure 7 It is a schematic diagram of the reverse structure of the insulator;
[0021] Figure 8 This is a schematic diagram of the front structure of the bearing steel sleeve;
[0022] Fig. 9 It is a schematic diagram of the reverse structure of the bearing steel sleeve;
[0023] Fig.10 is a cross-sectional view of the motor;
[0024] Fig.11 for Fig.10 A partial enlarged view of the middle bearing.
[0025] Description of Figure Numbers:
[0026] 1. End cover; 11. Bearing chamber; 12. Axial limiting groove; 13. Radial limiting groove; 14. Ring groove; 15. Protrusion; 16. First glue injection hole; 17. Second glue injection hole; 18. Boss;
[0027] 2. insulator; 21. annular body; 22. outer axial rib; 23. outer radial rib; 24. inner axial rib; 25. inner radial rib; 26. insulator notch; 27. through hole; 28. insulator annular flange;
[0028] 3. Bearing steel sleeve; 31. Steel sleeve body; 32. Axial groove; 33. Radial groove; 34. Steel sleeve annular flange; 35. Steel sleeve notch;
[0029] 4. Bearings. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0031] This embodiment discloses a motor end cover and a motor using the same, such as Figure 1 and Figure 2As shown, the motor end cover assembly is formed by assembling the motor end cover 1, the insulator 2, and the bearing steel sleeve 3. The bearing steel sleeve 3 is sleeved on the outside of the bearing 4, and the insulator 2 covers the outer wall of the bearing steel sleeve 3. The outer wall of the insulator 2 fits tightly with the inner wall of the bearing chamber 11 of the motor end cover 1, and the flow path of the shaft current can be effectively blocked without using an insulating bearing. The insulator 2 can be a separate component, and then embedded in the bearing chamber 11, or it can be directly formed in the bearing chamber 11 by injection molding or glue pouring of insulating materials. The injection molding or glue pouring method has a better effect, and the insulator 1 can be connected to the inner wall of the bearing chamber 11 as a whole, which is more stable. The following takes the use of glue pouring to form the insulator 2 as an example, and describes the structure and assembly relationship of each component in detail in combination with the accompanying drawings.
[0032] like Figure 3 , Figure 4 , Figure 5 As shown, the side of the motor end cover 1 facing the inside of the motor is the inner wall, and the middle of the inner wall of the motor end cover 1 forms a circular concave bearing chamber 11, and the middle of the bottom surface of the bearing chamber 11 forms a circular groove embedded in the end of the rotating shaft, and the surface around the circular groove forms a protrusion 15, and the bottom surface of the bearing chamber outside the protrusion 15 forms a concave annular groove 14. A plurality of axial limiting grooves 12 are arranged at a certain interval on the annular inner wall of the bearing chamber 11, and a first radial limiting groove 13 is arranged on the inner wall near the open end of the bearing chamber 11, and a second radial limiting groove (not numbered in the figure) is arranged on the inner wall near one end of the bottom surface of the bearing chamber. Each axial limiting groove 12 has one end extending to the open end of the bearing chamber 11, and the other end is connected with the second radial limiting groove, and two adjacent axial limiting grooves 12 are also connected by the two radial limiting grooves. In order to facilitate the formation of the insulator 2 on the inner wall of the bearing chamber 11 by pouring glue, a glue injection hole connected to the inner cavity of the bearing chamber 11 is also opened on the motor end cover 1 in this embodiment. There are two glue injection holes in total, the first glue injection hole 16 is located at the annular groove 14 on the bottom surface of the bearing chamber, and the second glue injection hole 17 is located at the open end surface of the bearing chamber 11. A circular boss 18 is formed in the middle of the outer wall of the motor end cover 1, and the first glue injection hole 16 runs all the way from the annular groove 14 to the side wall of the boss 18; the second glue injection hole 17 is opened from the open end of the bearing chamber 11 along the inside of the motor end cover 1 and runs all the way to the outer wall of the end cover next to the boss 18 of the motor end cover 1. The opening positions and channel paths of the above two glue injection holes are different, and the purpose is to facilitate the simultaneous pouring of insulating material into both sides of the bearing chamber 11 to better form the insulator 2.
[0033] The structure of the bearing steel sleeve 3 is as follows Figure 8 and Fig. 9As shown, the bearing steel sleeve 3 includes an annular steel sleeve body 31, and a plurality of axial grooves 32 are formed on the outer wall of the steel sleeve body 31 at a certain interval, and two annular radial grooves 33 are provided at intervals along the circumferential direction of the outer wall of the steel sleeve body 31. The two ends of each axial groove 32 extend to the two ends of the bearing steel sleeve 3, and the adjacent axial grooves 32 are connected by the radial grooves 33. The edge of the steel sleeve body 31 on the side facing the bottom surface of the bearing chamber extends inward to form a steel sleeve annular flange 34, and the width of the steel sleeve annular flange 34 is smaller than the width of the inner ring groove 14 of the bearing chamber 11. A steel sleeve notch 35 is provided on the steel sleeve annular flange 34, and when the bearing steel sleeve 3 is embedded in the bearing chamber 11 of the motor end cover 1, the steel sleeve notch 35 corresponds to and penetrates the first glue injection hole 16 on the motor end cover 1.
[0034] After the bearing steel sleeve 3 is installed in the bearing chamber 11 and the position is determined, a reserved gap is formed between the bearing steel sleeve 3 and the inner wall of the bearing chamber 11, and an insulator 2 is formed in the gap by pouring insulating material. During pouring, glue is poured from the first glue injection hole 16 and the second glue injection hole 17 to the gap between the bearing steel sleeve 3 and the inner wall of the bearing chamber 11, and the insulating material fills the gap between the two. After cooling and solidification, the insulator 2 is formed. The insulator 2, the bearing steel sleeve 3, and the motor end cover 1 are combined into one.
[0035] Based on the structural design of the bearing chamber 11 and the bearing steel sleeve 3 given above, the structure of the insulator 2 formed by the glue injection is as follows: Figure 6 and Figure 7 As shown, the insulator 2 includes an annular body 21, and a plurality of spaced outer axial ribs 22 and annular outer radial ribs 23 are formed on the outer wall of the annular body 21, and the edge of the annular body 21 on the side facing the bottom surface of the bearing chamber extends inward to form an insulator annular flange 28. A plurality of spaced inner axial ribs 24 and annular inner radial ribs 25 are formed on the inner wall of the annular body 21. A glue injection through hole 27 is formed on the insulator annular flange 28, and the through hole 27 is respectively connected with the steel sleeve notch 35 and the first glue injection hole 16, and an insulator notch 26 is formed on the end face of the annular body 21 away from the insulator annular flange 28, and the insulator notch 26 is connected with the second glue injection hole 17.
[0036] The motor end cover 1, the insulator 2, and the bearing steel sleeve 3 are assembled with each other to form a motor end cover assembly, the insulator annular flange 28 is embedded in the annular groove 14 of the bearing chamber 11, the outer axial rib 22 of the insulator 2 is embedded in the axial limiting groove 12 of the bearing chamber 11, the outer radial rib 23 of the insulator 2 is embedded in the radial limiting groove 13 of the bearing chamber 11, the inner axial rib 24 of the insulator 2 is embedded in the axial groove 32 of the bearing steel sleeve 3, and the inner radial rib 25 of the insulator 2 is embedded in the radial groove 33 of the bearing steel sleeve 3. The width of the insulator annular flange 28 is greater than the width of the steel sleeve annular flange 34, and can just cover the steel sleeve annular flange 34.
[0037] When the motor end cover assembly given above is installed on the motor, its structure is as follows Fig.10 and Fig.11 As shown, the attached drawings of this embodiment take the motor end cover assembly installed at the non-shaft extension end as an example. Since the motor end cover assembly is formed as an integral part by glue injection, the bearing 4 can be directly embedded in the inner cavity of the bearing steel sleeve 3, which is convenient for installation and can block the flow path of the shaft current at the non-shaft extension end.
[0038] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A motor end cover, comprising a bearing chamber arranged on one side of an inner wall of the end cover and an insulator arranged inside the bearing chamber, characterized in that: A plurality of axial limit grooves are formed on the inner wall of the bearing chamber at intervals, and an annular radial limit groove is also formed on the inner wall of the bearing chamber. An annular protrusion is formed on the bottom surface of the bearing chamber, and a concave annular groove is formed on the bottom surface of the outer ring of the protrusion. The axial limit groove is respectively connected with the radial limit groove and the annular groove; the insulator includes an annular body, and a plurality of spaced outer axial ribs and annular outer radial ribs are respectively formed on the outer wall of the annular body. The edge of the annular body facing the bottom surface of the bearing chamber extends toward the axial center side to form an annular flange of the insulator; the annular flange of the insulator is embedded in the annular groove of the bearing chamber, the outer axial rib of the insulator is embedded in the axial limit groove of the bearing chamber, and the outer radial rib of the insulator is embedded in the radial limit groove of the bearing chamber.
2. The motor end cover according to claim 1, characterized in that: There are at least two radial limit grooves on the inner wall of the bearing chamber, one of which is close to the open end of the bearing chamber, and the other is close to the bottom surface of the bearing chamber and connected with the annular groove; the number and position of the outer radial ribs on the insulator correspond to the radial limit grooves in the bearing chamber.
3. The motor end cover according to claim 1, characterized in that: The motor end cover is provided with a glue injection hole, which is communicated with the inner cavity of the bearing chamber.
4. The motor end cover according to claim 3, characterized in that: The motor end cover also includes a bearing steel sleeve arranged inside the bearing chamber, and an insulator is clamped between the inner wall of the bearing chamber and the outer wall of the bearing steel sleeve. The insulator is formed by injection molding or glue pouring to connect the bearing steel sleeve and the bearing chamber as a whole.
5. The motor end cover according to claim 4, characterized in that: The bearing steel sleeve comprises an annular steel sleeve body, on the outer wall of which a plurality of spaced axial grooves and annular radial grooves are respectively formed, and the edge of the steel sleeve body facing the bottom surface of the bearing chamber extends toward the axis to form an annular flange of the steel sleeve; on the inner wall of the annular body of the insulator, a plurality of spaced inner axial ribs and annular inner radial ribs are formed; the inner axial ribs are embedded in the axial grooves of the bearing steel sleeve, and the inner radial ribs are embedded in the radial grooves of the bearing steel sleeve, and the annular flange of the insulator covers the annular flange of the steel sleeve.
6. The motor end cover according to claim 4, characterized in that: The glue injection holes include a first glue injection hole arranged at the annular groove on the bottom surface of the bearing chamber, and a second glue injection hole arranged at the open end surface of the bearing chamber, and the first glue injection hole and the second glue injection hole are both connected to the outer wall of the motor end cover; a steel sleeve notch is provided on the steel sleeve annular flange of the bearing steel sleeve, and the steel sleeve notch is connected to the first glue injection hole; a through hole is provided on the annular flange of the insulator, and the through hole is respectively connected to the steel sleeve notch and the first glue injection hole, and an insulator notch is provided on the end surface of the annular body away from the side of the annular flange of the insulator, and the insulator notch is connected to the second glue injection hole.
7. A motor, characterized in that: It comprises a bearing and a motor end cover as claimed in any one of claims 1 to 6, wherein the bearing is located in an inner cavity of a bearing chamber, and an insulator is interposed between an inner wall of the bearing chamber and an outer wall of the bearing.