Motor lower casing and motor

Abstract

The utility model discloses a motor lower casing including a lower casing, an elastic washer, a lower cover and a shaft sleeve, the center of the bottom wall of the lower casing is provided with a circular through hole, the elastic washer is fixed at the bottom of the lower casing, the inner side of the elastic washer is provided with a plurality of elastic sheets, the plurality of elastic sheets are located right below the circular through hole, the inner side of each elastic sheet is a free end, and the end face of each elastic sheet is an arc surface. The arc surfaces of the elastic pieces form a mounting hole matched with the shaft sleeve in shape, the shaft sleeve is clamped into the mounting hole, and a blind hole position used for abutting against the end face of a motor rotating shaft is formed in the center of the top of the shaft sleeve. By arranging the shaft sleeve, the motor shaft end and the top surface of the blind hole of the shaft sleeve can fully press and rotate, the up-and-down movement of the motor rotating shaft is reduced, meanwhile, by arranging the elastic pieces, the motor rotating shaft can be buffered when moving up and down, the friction force of the motor rotating shaft during rotation is greatly reduced, and the service life of the motor rotating shaft is prolonged. Therefore, the improved motor has the advantages of low noise, small running current, less heat and small vibration.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a lower housing of a motor and a motor. Background Technology

[0002] Existing motor structures such as Figure 1 As shown, the motor shaft 101 is mounted on bearings 102 on both sides. Since the motor rotor rotates under the drive of the electromagnetic field of the coil, it is impossible for the motor rotor to rotate absolutely coaxially with the stator during operation. Therefore, eccentricity occurs, resulting in uneven magnetic gap vibration. This leads to an increase in the friction between the motor shaft 101 and the bearings 102. At the same time, since the motor shaft 101 itself does not have an axial limiting structure, it is also easy for axial runout to occur during operation. The coexistence of radial runout and axial runout causes the motor to easily experience problems such as high noise, high current, high heat generation, and high vibration during operation. Utility Model Content

[0003] In view of the technical problems existing in the background art, the purpose of this utility model is to provide a lower housing of a motor and a motor, which solves the technical problems of "existing motors having high operating noise, high current, high heat generation and high vibration" mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A motor lower housing includes a lower housing, an elastic washer, a lower cover, and a bushing. A circular through hole is formed at the center of the bottom wall of the lower housing. The elastic washer is fixed to the bottom of the lower housing. The inner side of the elastic washer has several spring tabs that can extend and retract axially, located directly below the circular through hole. The inner side of each spring tab is a free end with an arcuate end face. The arcuate surfaces of the spring tabs form a mounting hole that matches the shape of the bushing. The bushing is inserted into the mounting hole. A blind hole is formed at the center of the top of the bushing to abut against the end face of the motor shaft. The lower cover is fixed to the bottom of the elastic washer.

[0006] Furthermore, a buffer cavity is provided at the top center of the lower cover to allow the spring and bushing to move axially, and a through hole is provided at the bottom center of the lower cover for the bushing to pass through.

[0007] Furthermore, the bushing includes a stepped portion and a connecting portion, the connecting portion passing through the mounting hole from top to bottom and inserted into the through hole, and the bottom wall of the stepped portion abutting against a plurality of spring pieces.

[0008] Preferably, to improve the service life of the bushing and further reduce the friction between the motor shaft and the bushing, the bushing is made of self-lubricating POM plastic. Besides self-lubricating POM plastic, any wear-resistant material can also be used for the bushing.

[0009] Furthermore, the lower shell is a cylindrical structure with a bottom wall and tubular side walls.

[0010] Preferably, a plurality of pole claws are fixedly provided on the top of the bottom wall along the edge of the circular through hole.

[0011] Preferably, a convex notch is provided at the upper edge of the tubular sidewall.

[0012] Preferably, the shape of the spring is fan-shaped or irregular.

[0013] Preferably, in order to form a point contact with the arc-shaped end face of the motor shaft, the bottom surface of the blind hole is a plane.

[0014] This utility model also discloses a motor, including a housing, a motor shaft installed inside the housing and extending outward at one end, and a motor rotor arranged around the motor shaft. The housing includes an upper motor housing and a lower motor housing connected to each other, and the lower motor housing is the aforementioned lower motor housing.

[0015] The present invention has the following beneficial effects: by setting a bushing, the motor shaft end and the top surface of the blind hole of the bushing can be fully pressed and rotated, reducing the vertical movement of the motor shaft. At the same time, by setting several spring pieces, the vertical movement of the motor shaft can be buffered, greatly reducing the friction force when the motor shaft rotates. This makes the improved motor have the advantages of low noise, low operating current, low heat generation and low vibration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of an existing motor;

[0017] Figure 2 This is a three-dimensional structural diagram of the lower housing of the motor;

[0018] Figure 3 This is a three-dimensional structural diagram of the lower housing of the motor from another angle.

[0019] Figure 4 This is a top view of the lower housing of the motor;

[0020] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0021] Figure 6 This is a schematic diagram of the three-dimensional structure of an elastic washer;

[0022] Figure 7 This is a schematic diagram of the internal structure of the motor;

[0023] Figure 8 for Figure 7 A magnified view of part A in the diagram.

[0024] Explanation of main component symbols: 101, motor shaft; 102, bearing; 103, housing; 104, motor rotor; 1, lower housing; 10, circular through hole; 111, bottom wall; 112, tubular side wall; 113, pole claw; 114, U-shaped notch; 2, elastic washer; 20, spring; 200, mounting hole; 3, lower cover; 30, buffer cavity; 300, through hole; 4, bushing; 40, blind hole; 41, stepped part; 42, connecting part. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 2-6 As shown, this utility model discloses a lower motor housing, including a lower housing 1, an elastic washer 2, a lower cover 3, and a bushing 4. A circular through hole 10 is provided at the center of the bottom wall of the lower housing 1. The elastic washer 2 is fixed to the bottom of the lower housing 1. The inner side of the elastic washer 2 is provided with several spring pieces 20 that can extend and retract axially. The spring pieces 20 are located directly below the circular through hole 10. The inner side of the spring pieces 20 is a free end with an arc surface. The arc surface of the spring pieces 20 forms a mounting hole 200 that matches the shape of the bushing 4. The bushing 4 is inserted into the mounting hole 200. A blind hole 40 for pressing against the end face of the motor shaft is provided at the center of the top of the bushing 4. The lower cover 3 is fixed to the bottom of the elastic washer 2.

[0027] The lower cover 3 is fixed to the bottom of the elastic washer 2. A buffer cavity 30 is provided at the top center of the lower cover 3, which allows the spring piece 20 and the bushing 4 to move axially. A through hole 300 is provided at the bottom center of the lower cover 3, which allows the bushing 4 to pass through.

[0028] The bushing 4 includes a stepped portion 41 and a connecting portion 42. The cross-sectional dimension of the stepped portion 41 is larger than that of the connecting portion 42. The connecting portion 42 passes through the mounting hole 200 from top to bottom and is inserted into the through hole 300. The bottom wall of the stepped portion 41 abuts against a plurality of spring pieces 20. Preferably, the bushing 4 is made of self-lubricating POM plastic.

[0029] The lower housing 1 is a cylindrical structure with a bottom wall 111 and tubular sidewalls 112. Preferably, a plurality of pole claws 113 are fixedly provided on the top of the bottom wall 111 along the edge of the circular through hole 10. Preferably, a U-shaped notch 114 is provided at the upper edge of the tubular sidewall 112.

[0030] Preferably, the spring 20 is fan-shaped or irregularly shaped.

[0031] Preferably, the bottom surface of the blind hole 40 is a plane.

[0032] like Figure 7 , Figure 8 As shown, this utility model also discloses a motor, including a housing 103, a motor shaft 101 installed inside the housing 103 and extending outward at one end, and a motor rotor 104 arranged around the motor shaft 101. The housing 103 includes an upper motor housing and a lower motor housing connected to each other, and the lower motor housing is the aforementioned lower motor housing. The lower end face of the motor shaft 101 is an arc-shaped end face, and the arc-shaped end face makes point contact with the bottom surface of the blind hole 40.

[0033] This invention, by setting a bushing 4, allows the end face of the motor shaft 101 to be fully pressed and rotated against the top surface of the blind hole 40 of the bushing 4, reducing the vertical movement of the motor shaft 101. At the same time, by setting several spring pieces 20, the vertical movement of the motor shaft 101 can be buffered, greatly reducing the friction force when the motor shaft 101 rotates. This results in an improved motor with advantages such as low noise, low operating current, low heat generation, and low vibration.

[0034] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims are within the scope of protection of the present invention.

Claims

1. A motor lower case characterized by comprising: The motor lower casing comprises a lower shell, an elastic washer, a lower cover and a shaft sleeve. A circular through hole is formed in the center of the bottom wall of the lower shell. The elastic washer is fixed to the bottom of the lower shell. The inner side of the elastic washer is provided with a plurality of elastic sheets which can axially extend and contract. The plurality of elastic sheets are located directly below the circular through hole. The inner side of the elastic sheet is a free end and the end face is a circular arc surface. The circular arc surfaces of the plurality of elastic sheets form a mounting hole which is matched with the shape of the shaft sleeve. The shaft sleeve is clamped into the mounting hole. A blind hole is formed in the center of the top of the shaft sleeve for abutting against the end face of the motor rotating shaft. The lower cover is fixed to the bottom of the elastic washer.

2. A motor lower housing as claimed in claim 1, characterized in that: A buffer cavity is formed in the center of the top of the lower cover for the axial movement of the elastic sheet and the shaft sleeve. A through hole is formed in the center of the bottom of the lower cover for the shaft sleeve to pass through.

3. A motor lower housing as claimed in claim 2, characterized in that: The shaft sleeve comprises a step portion and a connecting portion. The connecting portion passes through the mounting hole from top to bottom and is inserted into the through hole. The bottom wall of the step portion abuts against the plurality of elastic sheets.

4. A motor lower housing as claimed in claim 3, characterized in that: The material of the shaft sleeve is self-lubricating POM plastic.

5. A motor lower housing as claimed in claim 1, characterized in that: The lower shell is a cylindrical structure with a bottom wall and a tubular side wall.

6. A motor lower housing as claimed in claim 5, characterised in that: A plurality of polar claws are fixed to the top of the bottom wall along the edge of the circular through hole.

7. A motor lower housing as claimed in claim 5, characterized in that: A convex letter-shaped notch is formed in the upper end edge of the tubular side wall.

8. A motor lower housing as claimed in claim 1, characterized in that: The shape of the elastic sheet is a sector or a special shape.

9. A motor lower housing as claimed in claim 1, characterized in that: The bottom surface of the blind hole is a flat surface.

10. A motor comprising a housing, a motor shaft mounted within said housing and extending outwardly at one end, and a motor rotor disposed about said motor shaft, the housing comprising a motor upper housing and a motor lower housing connected to one another, characterized by: The motor lower casing is any one of claims 1-9.

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