Micro motor end cover and micro motor

Abstract

The utility model discloses a miniature motor end cap and miniature motor, the miniature motor end cap comprises an end cap body, an end cap cover plate and a motor bearing, the end cap body is coaxially provided with a cover plate mounting groove and a bearing mounting hole in sequence from front to back, the motor bearing is arranged in the bearing mounting hole, and the end cap cover plate is arranged in the bearing mounting hole. The end cover piece is fixedly installed in the cover piece installation groove, a first buffering pad is arranged between the end cover piece and the motor bearing, the two sides of the first buffering pad are in close contact with the end cover piece and the outer ring of the motor bearing respectively, and a second buffering pad is coaxially arranged on the outer ring of the motor bearing. And the inner ring and the outer ring of the second buffer pad are respectively in close contact with the outer ring of the motor bearing and the inner wall of the end cover body. By combining the structural advantages of the conventional front end cover of the micro motor, the rotor assembly can be assembled from the front end cover, the motor assembly process is simplified, the vibration of the motor can be reduced, and the service life of the motor can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of micro motors, in particular to a micro motor end cover and a micro motor. Background Art

[0002] Motors are widely used in various electrical equipment. They are devices that convert electrical energy into mechanical energy, drive mechanical parts to complete corresponding actions, so that related mechanical equipment can operate normally. Therefore, motors are very important in the fields of machinery, electronics, mining, aviation, transportation, metallurgy, etc. Micro motors are a special type of motor with a very small size. They are widely used in various fields such as industrial automatic control, office automation, small electromechanical products, and children's toys. Like conventional motors, the rotor output shaft of micro motors also needs to be connected to and drive external loads, and the rotor output shaft needs to pass through the center hole of the motor end cover.

[0003] The current micro motor front end cover design generally has the following two structures:

[0004] 1. With spring structure, such as Figure 5 As shown, during assembly, the motor components except the rotor assembly can be assembled first, and then the rotor assembly can be installed as a whole to reduce the complexity of assembly. However, during operation, the micro motor will inevitably produce radial and axial vibrations, and the vibration will produce noise, affecting people's health and reducing the service life of the motor itself. The axial left end of the motor bearing of this structure directly contacts the retaining spring, and the right end directly contacts the annular baffle integrated with the motor end cover. There is no buffer component in the overall axial direction, which aggravates the vibration of the motor and shortens its service life.

[0005] 2. Structure without retaining spring, such as Figure 6 As shown, the axial left end is an annular retaining ring integrated with the motor end cover, and the right end is a free end. The left end has an O-ring and other components with a buffering effect arranged between the annular retaining ring and the motor bearing, and the right end has an axial limiter with a buffering effect when it is assembled with other motor components as a whole, thereby reducing motor vibration and extending its life. However, due to the obstruction of the annular retaining ring, the rotor assembly cannot be assembled from the front end cover, and the overall assembly is more complicated.

[0006] Therefore, it is necessary to improve the structure of the existing motor end cover. Utility Model Content

[0007] The purpose of the utility model is to propose a micro motor end cover and a micro motor in view of the deficiencies of the prior art, which, combined with the structural advantages of the existing micro motor front end cover, can not only realize the assembly of the rotor assembly from the front end cover, simplifying the motor assembly process, but also can reduce the motor vibration and extend the life of the motor.

[0008] The technical solution to achieve the purpose of this utility model is:

[0009] A micro motor end cover comprises an end cover body, an end cover cover plate and a motor bearing, wherein the end cover body is coaxially provided with a cover plate mounting groove and a bearing mounting hole in sequence from front to back, the motor bearing is arranged in the bearing mounting hole, the end cover cover plate is fixedly installed in the cover plate mounting groove and a first buffer pad is arranged between the motor bearing, the two sides of the first buffer pad are respectively in close contact with the end cover cover plate and the outer ring of the motor bearing, a second buffer pad is coaxially provided on the outer ring of the motor bearing, and the inner ring and outer ring of the second buffer pad are respectively in close contact with the outer ring of the motor bearing and the inner wall of the end cover body.

[0010] Furthermore, a first annular groove is provided on a side of the end cover plate close to the motor bearing, and the first buffer pad is an O-ring and is half-embedded in the first annular groove.

[0011] Furthermore, the outer ring of the first annular groove is provided with an annular stopper which is integrally formed with the end cover plate and extends toward the motor bearing direction, and the annular stopper abuts against the bottom of the cover plate installation groove.

[0012] Furthermore, at least two second buffer pads are provided and arranged in parallel.

[0013] Furthermore, the inner wall of the end cover body is provided with second annular grooves located in the bearing mounting hole and the number of the second annular grooves is the same as that of the second buffer pads. The second buffer pads are O-rings and are half-embedded in the corresponding second annular grooves.

[0014] Furthermore, the outer ring of the end cover cover plate and the inner ring of the end cover body on a side away from the motor bearing are provided with oppositely arranged welding chamfers, and the end cover cover plate and the end cover body are clearance-fitted and fixedly connected by welding through two welding chamfers.

[0015] Furthermore, the outer ring of the end cover cover plate is provided with a third annular groove which is recessed inwards, and the third annular groove is filled with glue which is in contact with the end cover body.

[0016] Furthermore, a metal circular thin wall extending outward is provided on an outer peripheral surface of one side of the end cover body away from the end cover cover plate.

[0017] A micro motor comprises the micro motor end cover as described above.

[0018] By adopting the above technical solution, the utility model has the following beneficial effects:

[0019] (1) The utility model limits the axial position of the motor bearing by means of an end cover plate that is designed as a separate structure from the end cover body, and combines the structural characteristics of the existing retaining spring structure and the micro motor end cover without the retaining spring structure. It can not only realize the assembly of the rotor assembly from the front end cover before fixing the end cover plate, thereby simplifying the motor assembly process, but also place the first buffer pad to realize axial buffering, and realize radial buffering through the second buffer pad, thereby reducing the vibration of the motor and extending the life of the motor.

[0020] (2) The utility model provides a first annular groove for placing the first buffer pad, which is convenient for installation and at the same time limits the first buffer pad to a certain extent to avoid skewing and affecting the buffering effect.

[0021] (3) The utility model sets an annular stop as a limit for the axial installation of the end cover cover plate, thereby ensuring that the axial installation depth of the end cover cover plate of each motor end cover is the same, and the overall appearance is more beautiful. At the same time, the first annular groove has sufficient space to avoid the outer ring of the first buffer pad and the end cover body from being squeezed and damaged.

[0022] (4) The utility model has at least two second buffer pads for radial buffering, so as to avoid hard contact between the outer ring and the end cover body caused by slight axial deflection after the motor bearing is installed, thereby further improving the buffering effect.

[0023] (5) The utility model provides a second annular groove for placing the second buffer pad, which is convenient for installation. At the same time, a certain position is limited for the second buffer pad to avoid crooked installation affecting the buffering effect.

[0024] (6) The utility model realizes the fixed connection between the end cover cover plate and the end cover body by welding chamfer welding, which not only ensures the connection strength but also has a smooth surface and beautiful appearance.

[0025] (7) The utility model is pre-set with a third annular groove for applying glue, which ensures that there is a sufficient amount of glue to pre-fix the front end cover plate and the end cover body for welding, facilitating subsequent welding operations.

[0026] (8) The end cover body of the utility model is provided with an integrally formed metal circular thin wall, which serves as the housing of the motor and has a higher concentricity than the traditional assembled structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the content of the utility model easier to understand, the utility model is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 It is a structural schematic diagram of Example 1;

[0029] Figure 2 This is a schematic diagram of the structure of the end cover body of Example 1;

[0030] Figure 3 This is a schematic diagram of the end cover structure of Example 1;

[0031] Figure 4 It is a structural schematic diagram of Example 2;

[0032] Figure 5 It is a schematic diagram of the structure of an existing motor end cover with a retaining spring structure;

[0033] Figure 6 It is a schematic diagram of the existing motor end cover structure without a retaining spring structure.

[0034] The reference numerals in the accompanying drawings are:

[0035] End cover body 1, cover plate mounting groove 1-1, bearing mounting hole 1-2, second annular groove 1-3, metal circular thin wall 1-4, end cover cover plate 2, first annular groove 2-1, annular stop 2-2, third annular groove 2-3, motor bearing 3, first buffer pad 4, second buffer pad 5, welding chamfer 6. DETAILED DESCRIPTION

[0036] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] (Example 1)

[0038] The micro motor of this embodiment includes Figures 1 to 3 The micro motor end cover shown includes an end cover body 1, an end cover cover plate 2 and a motor bearing 3, wherein the end cover body 1 is coaxially provided with a cover plate installation groove 1-1 and a bearing installation hole 1-2 from front to back, the motor bearing 3 is arranged in the bearing installation hole 1-2, the end cover cover plate 2 is fixedly installed in the cover plate installation groove 1-1 and a first buffer pad 4 is arranged between the motor bearing 3, the axial position of the motor bearing 3 is limited by the end cover cover plate 2 with a split structure design with the end cover body 1, and the rotor assembly is assembled from the front end cover before the end cover cover plate 2 is fixed, simplifying the motor assembly process. The two sides of the first buffer pad 4 are in close contact with the end cover cover plate 2 and the outer ring of the motor bearing 3 respectively, so as to realize axial buffering. The outer ring of the motor bearing 3 is coaxially provided with a second buffer pad 5, and the inner ring and outer ring of the second buffer pad 5 are in close contact with the outer ring of the motor bearing 3 and the inner wall of the end cover body 1 respectively, so as to realize radial buffering, thereby reducing the vibration of the motor and extending the life of the motor.

[0039] Specifically, a first annular groove 2-1 is provided on the side of the end cover plate 2 close to the motor bearing, which is used to place the first buffer pad 4. The first buffer pad 4 is an O-ring and is half-embedded in the first annular groove 2-1 for easy installation. At the same time, the first annular groove 2-1 limits the first buffer pad 4 to a certain extent to avoid skewing and affecting the buffering effect. The outer ring of the first annular groove 2-1 is provided with an annular stopper 2-2 that is integrally formed with the end cover plate 2 and extends toward the motor bearing 3. The annular stopper 2-2 abuts against the bottom of the cover plate installation groove 1-1. The annular stopper 2-2 is used as a limit for the axial installation depth of the end cover plate 2 to ensure that the axial installation depth of the end cover plate 2 of each motor end cover is the same, and the overall appearance is more beautiful. At the same time, the first annular groove 2-1 has enough space to avoid the outer ring of the first buffer pad 4 and the end cover body 1 from being squeezed and damaged.

[0040] Two second buffer pads 5 are arranged in parallel to avoid slight axial skew after the motor bearing 3 is installed, which may cause the outer ring to contact the end cover body 1, thereby further improving the buffering effect. Specifically, the inner wall of the end cover body 1 is provided with second annular grooves 1-3 located in the bearing mounting hole 1-2 and the same number as the second buffer pads 5, for placing the second buffer pads 5. The second buffer pads 5 are also O-rings and are half-embedded in the corresponding second annular grooves 1-3, which are easy to install. At the same time, the second buffer pads 5 are limited to a certain extent to avoid the impact of skewed installation on the buffering effect.

[0041] The outer ring of the end cover cover plate 2 and the inner ring of the end cover body 1 are provided with oppositely arranged welding chamfers 6 on the side away from the motor bearing 3. The end cover cover plate 2 and the end cover body 1 are gap-fitted and welded and fixedly connected through two welding chamfers 6, which not only ensures the connection strength, but also has a smooth surface and beautiful appearance. In order to facilitate the welding operation, the outer ring of the end cover cover plate 2 is provided with a third annular groove 2-3 that is recessed inward, and the third annular groove 2-3 is filled with glue that contacts the end cover body 1, and pre-fixation is achieved by glue, thereby facilitating subsequent welding and fixing.

[0042] This embodiment limits the axial position of the motor bearing 3 by means of an end cover cover plate 2 which is designed as a split structure from the end cover body 1, and combines the structural characteristics of the existing retaining spring structure and the micro motor end cover without a retaining spring structure. It can not only realize the assembly of the rotor assembly from the front end cover before fixing the end cover cover plate 2, thereby simplifying the motor assembly process, but also place the first buffer pad 4 to realize axial buffering, and realize radial buffering through the second buffer pad 5, thereby reducing the vibration of the motor and extending the life of the motor.

[0043] (Example 2)

[0044] The structure of this embodiment is similar to that of embodiment 1. Figure 4As shown, the outer peripheral surface of the end cover body 1 away from the end cover cover plate 2 is provided with a metal circular thin wall 1-4 extending outward, and the integrally formed metal circular thin wall is used as the motor casing, which has higher concentricity compared with the traditional assembled structure.

[0045] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro motor end cover, characterized in that: It includes an end cover body, an end cover cover plate and a motor bearing. The end cover body is coaxially provided with a cover plate installation groove and a bearing installation hole from front to back. The motor bearing is arranged in the bearing installation hole. The end cover cover plate is fixedly installed in the cover plate installation groove and a first buffer pad is arranged between the motor bearing. The two sides of the first buffer pad are respectively in close contact with the end cover cover plate and the outer ring of the motor bearing. The outer ring of the motor bearing is coaxially provided with a second buffer pad. The inner ring and outer ring of the second buffer pad are respectively in close contact with the outer ring of the motor bearing and the inner wall of the end cover body.

2. A micro motor end cover according to claim 1, characterized in that: A first annular groove is provided on one side of the end cover plate close to the motor bearing, and the first buffer pad is an O-ring and is half-embedded in the first annular groove.

3. A micro motor end cover according to claim 2, characterized in that: The outer ring of the first annular groove is provided with an annular stopper which is integrally formed with the end cover plate and extends toward the motor bearing direction, and the annular stopper abuts against the bottom of the cover plate installation groove.

4. The micro motor end cover according to claim 1, characterized in that: At least two second buffer pads are provided and arranged in parallel.

5. A micro motor end cover according to claim 4, characterized in that: The inner wall of the end cover body is provided with second annular grooves located in the bearing mounting hole and the number of the second annular grooves is the same as that of the second buffer pads. The second buffer pads are O-rings and are half-embedded in the corresponding second annular grooves.

6. The micro motor end cover according to claim 1, characterized in that: The outer ring of the end cover plate and the inner ring of the end cover body are provided with oppositely arranged welding chamfers on a side away from the motor bearing. The end cover plate and the end cover body are clearance-matched and are fixedly connected by welding through two welding chamfers.

7. A micro motor end cover according to claim 6, characterized in that: The outer circle of the end cover cover plate is provided with a third annular groove which is recessed inwards, and the third annular groove is filled with glue which is in contact with the end cover body.

8. The micro motor end cover according to claim 1, characterized in that: The outer peripheral surface of one side of the end cover body away from the end cover cover plate is provided with a metal circular thin wall extending outwards.

9. A micro motor, characterized in that: It comprises the micro motor end cover as claimed in any one of claims 1 to 8.

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