A positioning device for motor assembly

Abstract

This utility model provides a positioning device for motor assembly, belonging to the field of motor assembly technology. It solves the problem of difficulty in controlling the fitting accuracy between the rotating shaft and the front cover of the motor during existing motor assembly processes, resulting in low assembly efficiency. This positioning device for motor assembly includes a rod and a hammer. The rod is elongated and has a sliding section and a positioning section at one end. The positioning section is hollow and cylindrical. It is used to insert into the connecting sleeve of the front cover of the motor and has an interference fit with the shaft hole of the connecting sleeve. The inner hole of the positioning section allows the rotating shaft to be inserted and has an interference fit with the rotating shaft. The hammer is slidably disposed on the sliding section, and both ends of the sliding section have abutment parts for abutting against the hammer. This utility model has a simple structure and ingenious design, enabling precise control of the fitting between the rotating shaft and the front cover, improving coaxiality. Furthermore, the hammer applies impact to the rod for loading and unloading, making it quick, convenient, and highly efficient.

Description

Technical Field

[0001] This utility model belongs to the field of motor assembly technology and relates to a positioning device for motor assembly. Background Technology

[0002] An electric motor is a commonly used power output device that converts electrical energy into mechanical energy. It is widely used in home appliances, agricultural equipment, industrial equipment, fitness equipment, automobiles, and other fields. An electric motor mainly consists of a rotor and a stator. By energizing the coils on the stator, a rotating magnetic field is generated, which acts on the rotor to create magnetoelectric torque.

[0003] The external rotor motor disclosed in Chinese patent application (application number: 202121950614.8) includes a housing, a front cover, a rear cover, and a shaft. The housing has a first mounting stop at its front end that mates with the front cover, and a second mounting stop at its rear end that mates with the rear cover. The inner wall of the housing is provided with a plurality of evenly spaced magnets. The front cover mates with the housing and abuts against the first mounting stop. At least part of the front cover is located inside the housing, and the portion of the front cover outside the housing has fan blades and ventilation slots. The rear cover mates with the housing and abuts against the second mounting stop. The rear cover has ventilation holes. The shaft has a stator that mates with the magnets, and the shaft passes through the front cover and the rear cover. The housing, front cover, rear cover, and magnets constitute the rotor. Because the rotor and stator rotate at high speed during operation, the precision requirements for the fit between the rotor and stator are high, especially the coaxiality between the stator shaft and the connecting bushing of the rotor's front cover. Therefore, the assembly process requires high skill from workers, heavily relies on their assembly experience, and is relatively inefficient due to the high difficulty of assembly. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a positioning device for motor assembly. The technical problem to be solved by this utility model is: how to improve the assembly accuracy and assembly efficiency between the motor shaft and the front cover connecting bushing.

[0005] The objective of this utility model can be achieved through the following technical solution: A positioning device for motor assembly, characterized in that it includes a rod and a hammer. The rod is in the shape of a long rod, and has a sliding section and a positioning section located at one end of the rod. The positioning section is in the shape of a hollow cylinder. The positioning section is used to insert into the connecting sleeve of the front cover of the motor and to have an interference fit with the shaft hole of the connecting sleeve. The inner hole of the positioning section is for the insertion of a rotating shaft and to have an interference fit with the rotating shaft. The hammer is slidably disposed on the sliding section, and both ends of the sliding section have abutting parts for abutting against the hammer.

[0006] This invention features a hollow positioning section at one end of the rod. During motor assembly, the positioning section is inserted into the gap between the connecting sleeve and the rotating shaft, ensuring an interference fit between the outer circumferential surface of the positioning section and the shaft hole of the front cover connecting sleeve, as well as an interference fit between the inner hole of the positioning section and the outer circumferential surface of the rotating shaft. This ensures that the connecting sleeve and the rotating shaft remain coaxial, guaranteeing assembly accuracy. Furthermore, because the positioning section has interference fits with both the rotating shaft and the front connecting sleeve, the insertion resistance is relatively high. The impact generated by the sliding hammer colliding with the abutment facilitates both insertion and withdrawal of the positioning section from the gap, thereby improving assembly efficiency.

[0007] In the aforementioned positioning device for motor assembly, the hammer body is cylindrical, and the hammer body has a guide hole along the axial direction that slides with the sliding section, making it easier for workers to hold and providing a better operating feel.

[0008] In the aforementioned positioning device for motor assembly, the sliding section has a shoulder at one end near the positioning section, and the shoulder forms one of the aforementioned abutment portions.

[0009] In the aforementioned positioning device for motor assembly, an annular limiting block is fixedly connected to one end of the sliding section away from the positioning section, and the limiting block forms another aforementioned abutment.

[0010] In the aforementioned positioning device for motor assembly, the limiting block is a rolling bearing. Replacing the limiting block with a rolling bearing facilitates material sourcing and allows the limiting block to rotate relative to the rod, making it easier for workers to adjust the angles of the rod and the motor when holding the limiting block, thus facilitating assembly.

[0011] In the aforementioned positioning device for motor assembly, a vent hole communicating with the inner cavity of the positioning section is provided on the side wall of the positioning section. The vent hole prevents the shaft from being difficult to insert due to excessive air pressure within the positioning section during assembly.

[0012] In the aforementioned positioning device for motor assembly, the rod body has an axially oriented vent hole that communicates with the inner cavity of the positioning section.

[0013] In the aforementioned positioning device for motor assembly, the front end of the positioning section has a chamfer. The chamfer makes the front end of the positioning section conical, facilitating insertion into the connecting bushing of the motor front cover.

[0014] In the aforementioned positioning device for motor assembly, the positioning section is detachably connected to the rod body, so that different models of positioning sections can be replaced according to different motors.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. In the assembly of the motor, the present invention inserts a cylindrical positioning section into the gap between the connecting bushing and the rotating shaft of the front end cover of the motor, and makes an interference fit with the connecting bushing and the rotating shaft respectively to ensure the coaxiality between the connecting bushing and the rotating shaft. After the assembly is completed, the positioning section is removed to make the fit between the motor rotor and the stator more precise.

[0017] 2. This utility model has a sliding hammer on the rod, which allows the positioning section to be inserted into the gap between the front cover of the motor and the shaft by striking the abutment part on the side close to the positioning section with the hammer, and the positioning section to be separated from the front cover of the motor and the shaft by striking the abutment part on the side away from the positioning section with the hammer. The loading and unloading operation is more convenient and faster, thereby improving the assembly efficiency of the motor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the present invention;

[0020] Figure 3 This is a structural diagram of the rod.

[0021] In the diagram, 1 is the rod; 2 is the hammer; 21 is the guide hole; 3 is the positioning section; 31 is the vent hole; 4 is the sliding section; 5 is the shoulder; and 6 is the limit block. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] Example 1

[0024] A positioning device for motor assembly, such as Figure 1 As shown, it includes a rod body 1 and a hammer body 2. The rod body 1 is long and narrow, and the front end of the rod body 1 has a hollow cylindrical positioning section 3. The positioning section 3 is used to insert into the gap between the connecting sleeve and the rotating shaft of the motor front end cover. The hammer body 2 is slidably disposed on the rod body 1 and located above the positioning section 3. By sliding the hammer body 2 up and down, it can form an axial impact on the rod body 1, which facilitates the insertion of the positioning section 3 into or out of the gap between the connecting sleeve and the rotating shaft.

[0025] Specifically, such as Figures 1-3As shown, in this embodiment, both the rod 1 and the hammer 2 are supported by high-quality steel with high hardness. The rod 1 is long and includes a positioning section 3 and a sliding section 4. The positioning section 3 is located at the front end of the rod 1 and is hollow cylindrical. The outer circumferential surface of the positioning section 3 is coaxial with the inner hole. The outer circumferential surface of the positioning section 3 is interference-fitted with the shaft hole of the motor front end cover connecting bushing. The inner hole of the positioning section 3 is for the insertion of the rotating shaft and forms an interference fit with the rotating shaft, so that after the positioning section 3 is inserted into the gap between the connecting bushing of the motor front end cover and the rotating shaft, the connecting bushing and the rotating shaft remain coaxial. Furthermore, in this embodiment, the side of the positioning section 3 also has a vent hole 31 communicating with the inner cavity of the positioning section 3, to prevent the internal air from being unable to escape when the rotating shaft is inserted into the positioning section 3, thus avoiding insertion difficulties. Furthermore, the front end of the positioning section 3 also has a chamfer to facilitate the insertion of the positioning section 3 into the connecting bushing.

[0026] In this embodiment, the sliding section 4 is located at the rear section of the rod 1 and occupies more than half of the rod 1 assembly. The hammer 2 is cylindrical and has a guide hole 21 along the axial direction that slides with the sliding section 4, so that the hammer 2 is fitted onto the sliding section 4 and can move up and down along the sliding section 4. The end of the sliding section 4 near the positioning section 3 is provided with a shoulder 5, and the end of the sliding section 4 away from the positioning section 3 is provided with a limiting block 6. The limiting block 6 is disc-shaped and is fixedly connected to the rod 1 as a whole. In this embodiment, the outer diameter of the shoulder 5 and the limiting block 6 are both larger than the diameter of the guide hole 21 of the hammer 2, so that the two ends of the sliding end form abutment parts that can abut and collide with the hammer 2, so as to form an axial impact on the rod 1.

[0027] The steps for using this utility model are as follows: First, the rotor and stator of the motor are initially assembled, so that the rotating shaft is inserted into the connecting sleeve of the front end cover of the motor, and the motor is kept in a vertical state with the front end cover at the top. Then, the rod 1 is kept in a vertical state and the positioning section 3 at the front end of the rod 1 is aligned with the gap between the connecting sleeve and the rotating shaft. By moving the hammer 2 up and down, the hammer 2 collides with the lower shoulder 5, so that the positioning section 3 is embedded in the gap, and the connecting sleeve and the rotating shaft are kept coaxial. After the assembly is completed, the hammer 2 collides with the upper limiting block 6, so that the positioning section 3 is dislodged from the gap between the connecting sleeve and the rotating shaft.

[0028] Example 2

[0029] This embodiment is basically the same as the technical solution of Embodiment 1. The difference is that in this embodiment, the limiting block 6 adopts a rolling bearing, which is fixed to the rod 1 through the inner ring of the rolling bearing, so that the worker can easily adjust the angle of the rod 1 and the motor when holding the rolling bearing, which is convenient for assembly.

[0030] Furthermore, in this embodiment, the vent 31 can also be arranged along the axial direction of the rod 1 and communicate with the inner cavity of the connecting end.

[0031] Furthermore, in this embodiment, the positioning segment 3 and the rod body 1 can be connected by a detachable connection such as a threaded connection or a pin connection, so that different models of connecting segments can be replaced according to different motors.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0033] Although this document uses terms such as rod 1, hammer 2, and limiting block 6 frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this information.

Claims

1. A positioning device for motor assembly, characterized in that, The device includes a rod (1) and a hammer (2). The rod (1) is long and has a sliding section (4) and a positioning section (3) at one end of the rod (1). The positioning section (3) is hollow and is used to insert the connecting sleeve of the front cover of the motor and to press against the shaft hole of the connecting sleeve. The inner hole of the positioning section (3) is for the insertion of the rotating shaft and to press against the rotating shaft. The hammer (2) is slidably disposed on the sliding section (4), and both ends of the sliding section (4) have abutting parts for abutting against the hammer (2).

2. The positioning device for motor assembly according to claim 1, characterized in that, The hammer body (2) is cylindrical, and the hammer body (2) has a guide hole (21) along the axial direction that slides with the sliding section (4).

3. The positioning device for motor assembly according to claim 1 or 2, characterized in that, The sliding section (4) has a shoulder (5) at one end near the positioning section (3), and the shoulder (5) forms one of the aforementioned abutments.

4. The positioning device for motor assembly according to claim 3, characterized in that, The sliding section (4) is fixedly connected to an annular limiting block (6) at one end away from the positioning section (3), and the limiting block (6) forms another of the aforementioned abutment parts.

5. The positioning device for motor assembly according to claim 4, characterized in that, The limiting block (6) is a rolling bearing.

6. The positioning device for motor assembly according to claim 1 or 2, characterized in that, The side wall of the positioning section (3) has a vent (31) that communicates with the inner cavity of the positioning section (3).

7. The positioning device for motor assembly according to claim 1 or 2, characterized in that, The rod (1) has an axially oriented vent (31) that communicates with the inner cavity of the positioning section (3).

8. The positioning device for motor assembly according to claim 1 or 2, characterized in that, The front end of the positioning segment (3) has a chamfer.

9. The positioning device for motor assembly according to claim 1 or 2, characterized in that, The positioning segment (3) is detachably connected to the rod (1).

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