Motor shell structure for improving fretting wear of bearing

Abstract

The utility model relates to the field of air conditioner motors, and particularly discloses a motor shell structure for improving bearing fretting wear, which is characterized by comprising a shell, bearing mounting parts for mounting bearings are arranged at two ends of the shell, and rubber ring mounting parts corresponding to the bearing mounting parts are arranged on the outer wall of the shell. The rubber ring installation part and the bearing installation part are arranged in a radial clearance mode, and the rubber ring installation part is made of metal materials. The radial clearance is formed between the rubber ring mounting part and the bearing mounting part, and finally, the radial clearance is formed between the rubber ring and the bearing, so that vibration transmitted to the bearing on the rubber ring is reduced, and the wear of the bearing is finally improved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of air conditioner motors, in particular to a motor shell structure for improving bearing fretting wear. BACKGROUND

[0002] In an air conditioner, the bearings of the permanent magnet motor used by the fan in the fan coil are prone to fretting wear and noise. The specific reason is that the bearings are placed in the bearing chamber, the bearing chamber directly contacts the rubber ring, the rubber ring is placed on the mounting bracket, and vibration of the mounting bracket is directly transmitted to the bearings through the rubber ring and the bearing chamber, thereby causing the bearings to be damaged by stress. CONTENT OF THE UTILITY MODEL

[0003] In order to improve the wear problem, the application provides a motor shell structure for improving bearing fretting wear.

[0004] The motor shell structure for improving bearing fretting wear provided by the application is characterized in that the motor shell structure comprises a shell, both ends of the shell are provided with bearing mounting portions for mounting bearings, the outer wall of the shell is provided with rubber ring mounting portions corresponding to the bearing mounting portions, the rubber ring mounting portions are arranged in a radial gap with the bearing mounting portions, and the rubber ring mounting portions are made of metal.

[0005] Optionally, at least one end of the shell is provided with an opening, an end cover is mounted at the opening, a metal sleeve is arranged on the end cover, the bearing mounting portion is arranged on the end cover, and the rubber ring mounting portion is arranged on the metal sleeve.

[0006] Optionally, at least one of the bearing mounting portions is integrally formed in the shell.

[0007] Optionally, the axial portions of the rubber ring mounting portion and the bearing mounting portion are arranged in coincidence, and the axial coincidence ratio of the rubber ring mounting portion and the bearing mounting portion is not less than 60% of the axial length of the rubber ring mounting portion.

[0008] Optionally, the shell and the end cover form an internal space, the metal sleeve comprises a first connecting portion on one side of the end cover and a second connecting portion on the other side of the end cover, the first connecting portion and the second connecting portion are integrally formed through a connecting column, a connecting hole is formed in the end cover, and the connecting column passes through the connecting hole.

[0009] Optionally, the first connecting portion is located in the internal space, and the rubber ring mounting portion is located on the second connecting portion.

[0010] Optionally, one side of the first connecting portion close to the internal space is concave to form a groove structure, and the other side of the first connecting portion corresponds to the groove to form a convex structure.

[0011] Optionally, the shell forms an annular step at the opening, and the end cover is provided with an annular clamping groove clamped into the annular step.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] 1. By setting the radial gap between the rubber ring mounting portion and the bearing mounting portion, the rubber ring and the bearing are finally set with radial gap, thus reducing the vibration transmission from the rubber ring to the bearing, thereby finally improving the bearing wear.

[0014] 2. By controlling the axial coincidence of the rubber ring mounting portion and the bearing mounting portion, the overall axial length of the motor is reduced, which is beneficial to the miniaturization of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0016] Figure 2 is a schematic diagram of the half-section structure of the metal sleeve;

[0017] Figure 3 is a schematic diagram of one side of the end cover;

[0018] Figure 4 is a schematic diagram of the other side of the end cover.

[0019] Reference signs: 1, housing; 2, bearing mounting portion; 3, rubber ring mounting portion; 4, opening; 5, end cover; 6, metal sleeve; 7, internal space; 8, first connecting portion; 9, second connecting portion; 10, connecting column; 11, connecting hole; 12, first cavity; 13, second cavity; 14, step surface; 15, groove structure; 16, protrusion structure; 17, mounting bracket; 18, bending portion; 19, annular step; 20, annular clamping groove; 21, extension portion; 22, motor rotating shaft. DETAILED DESCRIPTION

[0020] The following will be described in detail below in combination with the accompanying Figures 1-4 The present application will be further described in detail.

[0021] The embodiment of the present application discloses a motor housing structure for improving the micro-motion wear of bearings.

[0022] A motor housing structure for improving the micro-motion wear of bearings, comprising a housing 1, which is generally cylindrical in structure. The housing 1 has a bearing mounting portion 2 for mounting bearings at both ends, and the housing 1 has a rubber ring mounting portion 3 corresponding to the bearing mounting portion 2 on the outer wall, and the rubber ring mounting portion 3 is set with radial gap from the bearing mounting portion 2.

[0023] Specifically, the shell 1 has an opening 4 at least at one end, and an end cover 5 is installed at the opening 4. The end cover 5 is provided with a metal sleeve 6, which is generally made of iron and is not easy to deform and has high structural strength. The bearing mounting portion 2 is located on the end cover 5, and the rubber ring mounting portion 3 is located on the metal sleeve 6. In more detail, the shell 1 and the end cover 5 form an internal space 7. The metal sleeve 6 includes a first connecting portion 8 located on one side of the end cover 5 and a second connecting portion 9 located on the other side of the end cover 5. The first connecting portion 8 and the second connecting portion 9 are fixed together through a connecting column 10. In actual processing, the second connecting portion 9 and the connecting column 10 are integrally formed, and then the first connecting portion 8 and the connecting column 10 are welded. In fact, the second connecting portion 9 can be directly welded with the end cover 5 through the connecting column 5, and the first connecting portion 8 can be omitted. The end cover 5 is provided with a connecting hole 11, and the connecting column 10 passes through the connecting hole 11. When the end cover 5 is installed on the shell 1, the first connecting portion 8 is located in the internal space 7, and the second connecting portion 9 has a tubular structure with both ends through. The outer side wall of the second connecting portion 9 has a stepped structure with varying diameters. The inner cavity of the second connecting portion 9 has a first cavity 12 and a second cavity 13. The first cavity 12 is close to the internal space 7 and has a larger diameter than the second cavity 13. The two cavities form a step surface 14 at the junction. The rubber ring mounting portion 3 is located on the second connecting portion 9 and is located at the outermost side of the second connecting portion 9. The side of the first connecting portion 8 close to the internal space 7 is concave to form a groove structure 15, and the other side of the first connecting portion 8 corresponds to the groove to form a protruding structure 16. The end cover 5 has an outwardly protruding (away from the internal space 7) bearing mounting portion 2. The bearing mounting portion 2 is located in the second cavity 13 and is spaced apart from the second cavity 13. The end cover 5 further includes a bending portion 18 extending along the radial direction of the shell 1, and the bending portion 18 abuts against the step surface 14. The shell 1 forms an annular step 19 at the opening 4, and the end cover 5 forms an annular clamping groove 20 clamped into the annular step 19.

[0024] The end cover 5 and the shell 1 described above are generally made of aluminum, and the end cover 5 is integrally cast.

[0025] Another way is that at least one bearing mounting portion 2 is located in the shell 1 and is integrally formed with the shell 1. At this time, the rubber ring mounting portion 3 is also integrally formed with the shell 1, and the rubber ring mounting portion 3 is located on the outer side of the bearing mounting portion 2.

[0026] Since the motor body needs to be placed in the shell 1, in order to improve the assembly efficiency, only one end opening 4 is generally provided, and the other end is not provided with an opening 4. The bearing mounting portion 2 located in the shell 1 is integrally formed with the shell 1. Of course, both ends have openings 4, and end covers 5 are installed at both ends, and the bearing mounting portion 2 is located on the end cover 5. It is also feasible that the bearing mounting portion 2 of both ends is located in the shell 1 and is integrally formed with the shell 1.

[0027] The bearing mounting portion 2 has an extension portion 21 extending radially along the shell 1, and the bearing mounting portion 2 and the inner wall of the shell 1 have a radial gap through the extension portion 21.

[0028] The rubber ring mounting portion 3 is arranged in axial coincidence with the bearing mounting portion 2, and the axial coincidence ratio of the rubber ring mounting portion 3 and the bearing mounting portion 2 is not less than 60% of the axial length of the rubber ring mounting portion 3. For example, the axial length of the rubber ring mounting portion 3 is 30mm, and at least 18mm of the length is axially coincident with the bearing mounting portion 2. This mode is beneficial to reduce the axial length of the rubber ring mounting portion 3, thereby reducing the axial length of the whole motor. Since the space in the air conditioner is small, this design is particularly crucial for miniaturization of the air conditioner.

[0029] Working principle: in actual use, the internal space 7 is mounted with a motor body, the motor shaft 22 extends out of the through hole on the bearing mounting portion 2, the buffer rubber ring is mounted on the rubber ring mounting portion 3, and the mounting bracket 17 is fixed on the buffer rubber ring. The mounting bracket 17 is used for mounting the whole motor to the air conditioner fan coil.

[0030] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, and a specific orientation and operation. Therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, "a plurality of" means two or more.

[0031] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A motor housing structure for improving bearing fretting wear, characterized in that: The device includes a housing, both ends of which have bearing mounting portions for mounting bearings. The outer wall of the housing has a rubber ring mounting portion corresponding to the bearing mounting portion. The rubber ring mounting portion and the bearing mounting portion are radially spaced. The rubber ring mounting portion is made of metal.

2. The motor housing structure for improving bearing fretting wear according to claim 1, characterized in that: The housing has an opening at at least one end, an end cap is installed at the opening, a metal sleeve is provided on the end cap, the bearing mounting part is located on the end cap, and the rubber ring mounting part is located on the metal sleeve.

3. The motor housing structure for improving bearing fretting wear according to claim 1, characterized in that: At least one of the bearing mounting portions is located inside the housing and is integrally formed with the housing.

4. The motor housing structure for improving bearing fretting wear according to claim 1, characterized in that: The rubber ring mounting part and the bearing mounting part are arranged to overlap along the axial direction, and the axial overlap ratio of the rubber ring mounting part and the bearing mounting part is not less than 60% of the axial length of the rubber ring mounting part.

5. The motor housing structure for improving bearing fretting wear according to claim 2, characterized in that: The housing and the end cap form an internal space. The metal sleeve includes a first connecting part located on one side of the end cap and a second connecting part located on the other side of the end cap. The first connecting part and the second connecting part are integrally formed by a connecting post. A connecting hole is provided on the end cap, and the connecting post passes through the connecting hole.

6. The motor housing structure for improving bearing fretting wear according to claim 5, characterized in that: The first connecting part is located in the internal space, and the rubber ring mounting part is located on the second connecting part.

7. A motor housing structure for improving bearing fretting wear according to claim 5, characterized in that: The first connecting part has a recessed groove structure on one side near the internal space, and a protruding structure is formed on the other side of the first connecting part corresponding to the groove.

8. The motor housing structure for improving bearing fretting wear according to claim 2, characterized in that: The housing forms an annular step at the opening, and the end cap has an annular groove that engages with the annular step.

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