Brushless motor convenient to assemble

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a brushless motor convenient to assemble. A brushless motor convenient to assemble comprises a machine shell and a rear end cover, one end of the machine shell is open, and the inner wall of the machine shell is provided with at least one positioning protrusion matched with a groove in the outer wall of a stator assembly; a first assembling groove and a second assembling groove which are different in size are formed in the end, corresponding to the open end, of the wall body of the machine shell, and the connecting line of the midpoint of the first assembling groove and the midpoint of the second assembling groove passes through the center of the machine shell. A first assembling block and a second assembling block which are in one-to-one correspondence with the first assembling groove and the second assembling groove are arranged on the circumferential outer edge of the rear end cover, the rear end cover is further provided with a leading-out wire groove with a lateral opening, and the included angle between the leading-out wire groove and the first assembling block and the included angle between the leading-out wire groove and the second assembling block are 90 degrees. The utility model has the advantages that the installation precision of installation personnel can be improved while the motor is ensured to be installed simply and conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a brushless motor which is convenient for assembly. Background Art

[0002] A Chinese patent with the application number 201520914689.9 discloses a brushless motor which is easy to assemble, including a machine shell and an end cover assembly. The end cover assembly includes a front cover installed at the front end of the machine shell and a rear cover installed at the rear end of the machine shell. A cavity is formed between the machine shell and the end cover assembly. However, the machine shell, end cover, bearing, rotor and stator assembly of the motor are usually installed manually. For example, the installation accuracy of the bearing or stator assembly is limited by the proficiency and quantity of manual assembly. When installed by different installers, there will be errors in the positioning accuracy to a certain extent. If the error is large, it will affect the subsequent assembly accuracy and the performance of the whole motor.

[0003] When the brushless motor of the above solution is installed, although the installation is relatively simple, the accuracy after installation cannot be guaranteed. For example, the stator winding group of the brushless motor includes lead wires. When the stator winding group of the above solution is installed, it is difficult to ensure the circumferential position of the stator winding group in the machine shell. As a result, after the end cover and the machine shell are installed and fixed, it may occur that the lead wires are far from the lead wire grooves on the end cover, and the installer needs to reinstall them, which is rather troublesome. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a brushless motor which is convenient for assembly and can improve the installation accuracy of installers while ensuring the simplicity of motor installation.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A brushless motor which is convenient for assembly, including a machine shell and a rear end cover. One end of the machine shell is open. At least one positioning protrusion which is matched with the groove on the outer wall of the stator assembly is arranged on the inner wall of the machine shell. At the end of the wall body of the machine shell corresponding to the open end, a first assembly groove and a second assembly groove with different sizes are arranged. The connection line of the midpoints of the first assembly groove and the second assembly groove passes through the center of the machine shell. At the circumferential outer edge of the rear end cover, a first assembly block and a second assembly block which respectively correspond to the first assembly groove and the second assembly groove one by one are arranged. The rear end cover is also provided with a lead wire groove with a lateral opening, and the lead wire groove is arranged at an angle of 90° with the first assembly block and the second assembly block.

[0006] During the installation process, the installer places the entire housing vertically with the front cover facing down, inserts the rotor assembly into the housing, and then rotates the housing by an angle in the circumferential direction to determine the specific positions of the first and second fitting grooves of the housing, so that the installer can generally figure out the specific position of the lead wire. Then, the installer rotates the stator assembly to an angular position such that the lead wire forms a 90° angle with the first and second fitting grooves, and then places the stator assembly into the housing so that the grooves on the stator assembly cooperate with the positioning protrusions to limit the circumferential position of the stator assembly. At this time, the stator assembly cannot rotate in the circumferential direction. Then, the installer installs the rear cover at the opening of the housing so that the first fitting block cooperates with the first fitting groove and the second fitting block cooperates with the second fitting groove to complete the installation of the brushless motor.

[0007] Among them, during installation, the installer can place the larger first or second fitting groove in the left-right direction, so that the installer can clearly know the approximate position of the lead wire groove after the rear cover is installed. Thus, when the installer installs the stator assembly, the lead wire is set at a 90° angle with the first and second fitting grooves or placed at a position centered in the circumferential direction between the first and second fitting grooves.

[0008] In this solution, by setting the first and second fitting grooves with different sizes on the rear cover, and the connection line of the first and second fitting grooves passes through the center of the housing, and at the same time the lead wire groove forms a 90° angle with the first and second fitting blocks, it enables the installer to clearly judge the position where the lead wire of the stator assembly should be placed during installation. At the same time, the positioning part is used to assist the installer in installing the stator assembly again, so as to ensure the accuracy requirements during the installation of the stator assembly, ensure that the lead wire has a unique outgoing direction, and improve the installation accuracy of the installer while making the motor installation simple.

[0009] Preferably, the first and second fitting grooves penetrate the wall of the housing in the radial direction, and the length of the first fitting groove is greater than the length of the second fitting groove.

[0010] The first and second fitting grooves penetrate the side wall of the housing in the radial direction, which is convenient for processing and can increase the contact area when the first and second fitting blocks cooperate.

[0011] Preferably, a circular protrusion is provided on the end face at the opening of the housing to form a rabbet structure; when the rear cover is fitted with the housing, the rear cover is supported on the end face of the rabbet structure, and the circumferential outer wall of the rear cover is in contact and cooperation with the circumferential inner wall of the circular protrusion.

[0012] The circumferential outer wall of the rear cover is in contact with the circumferential inner wall of the circular protrusion, and the rear cover can be in contact with the end face of the rabbet, which is convenient for the assembly of the rear cover.

[0013] Preferably, the other end of the casing is provided with a front end cover integrally formed with the casing, and the inner wall of the casing near the front end cover side is provided with a plurality of annularly and evenly spaced limiting protrusions.

[0014] By providing the limiting protrusions, the axial position of the stator assembly can be limited.

[0015] Preferably, the limiting protrusions extend in the circumferential direction, the positioning protrusions extend in the axial direction, and both the limiting protrusions and the positioning protrusions are integrally formed with the casing.

[0016] The limiting protrusions extending in the circumferential direction increase the contact area between the stator assembly and the limiting protrusions, and the positioning protrusions extending in the axial direction increase the positioning effect of the stator assembly in the circumferential direction.

[0017] Preferably, the front end cover is provided with a first bearing chamber extending axially outward, the front end cover is further provided with a plurality of positioning posts extending axially inward, the positioning posts are provided with threaded holes opening axially inward, the front end cover is equipped with a bearing fixing plate for restricting the bearing in the first bearing chamber, and the bearing fixing plate is provided with fixing holes corresponding to the positioning posts one by one.

[0018] The bearing on the rotor assembly needs to be installed in the first bearing chamber. Usually, the installation methods between the bearing and the first bearing chamber are tight fitting and press fitting, loose fitting and gluing, riveting and fixing, etc. Whether the assembly is reliable depends on factors such as the dimensional design accuracy of the bearing chamber, the selection and dosage of glue, and the actual operation of the assembly personnel being correct and standard also has a certain impact; in this solution, the bearing is restricted in the first bearing chamber by the bearing fixing plate, thereby reducing the errors caused by whether the actual operation of the assembly personnel is correct and standard. And it can also improve the assembly reliability of the bearing and further reduce the axial displacement of the bearing.

[0019] Preferably, the plurality of positioning posts are annularly and evenly spaced, and the bearing fixing plate is provided with a groove adapted to the bearing.

[0020] Providing the groove can better adapt to the bearing.

[0021] Preferably, the rear end cover is provided with a second bearing chamber, and the openings of both the first bearing chamber and the second bearing chamber are rounded.

[0022] The rounded transition can facilitate the cooperation between the first bearing chamber and the second bearing chamber during assembly.

[0023] The utility model has the advantages of ensuring the simplicity of motor installation while improving the installation accuracy of installers. Description of the Drawings

[0024] Figure 1It is a schematic structural diagram of the housing.

[0025] Figure 2 It is a side view of the housing.

[0026] Figure 3 It is a schematic structural diagram of the opening of the housing.

[0027] Figure 4 It is a schematic structural diagram of the bearing fixing plate.

[0028] Figure 5 It is a schematic structural diagram of the rear end cover.

[0029] Figure 6 It is a schematic structural diagram of the stator assembly.

[0030] Figure 7 It is a schematic structural diagram of the rotor assembly.

[0031] Reference numerals in the drawings: 1. Housing; 11. Front end cover; 12. Positioning post; 13. First bearing chamber; 2. Positioning projection; 3. Limiting projection; 41. First assembly groove; 42. Second assembly groove; 43. End face of the rabbet; 5. Annular projection; 6. Bearing fixing plate; 61. Fixing hole; 62. Groove; 7. Rear end cover; 71. First assembly block; 72. Second assembly block; 73. Lead wire groove; 74. Recess; 75. Second bearing chamber; 8. Stator assembly; 81. Slot of the stator assembly; 82. Lead wire; 9. Rotor assembly; 91. First bearing; 92. Second bearing. Specific embodiments

[0032] The following further describes the present invention with reference to the drawings and specific embodiments.

[0033] As Figure 1 and Figure 2 shown, this embodiment discloses a brushless motor facilitating assembly, including a housing 1 and a rear end cover 7. One end of the housing 1 is provided with a front end cover 11 integrally provided with the housing 1, and the other end of the housing 1 is open. On the inner wall of the housing 1, there is a positioning projection 2 that cooperates with the slot 81 of the stator assembly; the positioning projection 2 extends along the axial direction and both axial ends of the positioning projection 2 are arc-shaped. On the inner wall of the housing 1 near the front end cover 11 side, there are two limiting projections 3 arranged at uniform intervals along the circumferential direction. The limiting projections 3 extend along the circumferential direction and are used to limit the axial position of the stator assembly 8. The front end cover 11 is provided with a first bearing chamber 13 extending axially outward, and the front end cover 11 is also provided with four positioning posts 12 extending axially inward. The four positioning posts 12 are arranged at uniform intervals along the circumferential direction, and the positioning posts 12 are provided with threaded holes opening axially inward. Among them, the positioning projection 2 and the limiting projection 3 are integrally provided with the housing 1, and the positioning projection 2 and the limiting projection 3 are made to protrude inwardly of the housing by deforming the side wall of the housing 1 by extrusion.

[0034] As Figure 1 and Figure 4 shown, the front end cover 11 is equipped with a bearing fixing plate 6 that confines the bearing within the first bearing chamber 13. The bearing fixing plate 6 is provided with fixing holes 61 corresponding one-to-one to the positioning posts 12, and the bearing fixing plate 6 is recessed in the axial direction to form a groove 62 that mates with the bearing.

[0035] As Figure 3 and Figure 5 shown, a circumferential raised ring 5 is provided on the end face at the opening of the housing 1 to form a rabbet structure; the opening of the housing 1 is also provided with a first assembly groove 41 and a second assembly groove 42 that radially penetrate the side wall of the housing 1 and the circumferential raised ring 5. The line connecting the midpoints of the first assembly groove 41 and the second assembly groove 42 passes through the center of the housing 1. The length of the first assembly groove 41 is greater than the length of the second assembly groove 42. Two first assembly blocks 71 and second assembly blocks 72 corresponding one-to-one to the first assembly groove 41 and the second assembly groove 42 are provided on the circumferential outer wall of the rear end cover 7. The length of the first assembly block 71 is greater than the length of the second assembly block 72. A lead wire groove 73 that laterally opens outward is further provided on the circumferential outer edge of the rear end cover 7. The lead wire groove 73 is disposed at a 90° angle to the first assembly block 71 and the second assembly block 72. When the rear end cover 7 is fitted with the housing 1, the circumferential outer wall of the rear end cover 7 is in contact and fit with the circumferential inner wall of the circumferential raised ring 5, and the rear end cover 7 is supported on the end face 43 of the rabbet. The rear end cover 7 is recessed in the axial direction to form a recess 74. The recess 74 strengthens the strength of the rear end cover 7, and an axial second bearing chamber 75 is provided in the recess 74 of the rear end cover. The openings of the first bearing chamber 13 and the second bearing chamber 75 are both fillet transitioned.

[0036] During the assembly of the brushless motor, the installer first places the housing 1 upright, places the first bearing 91 on the rotor assembly 9 in the first bearing chamber 13, and then aligns the fixing holes 61 of the bearing fixing plate 6 with the positioning posts 12 of the front end cover 11 one by one, and fixes the bearing fixing plate 6 and the front end cover 11 with screws, so that the first bearing 91 is restricted in the first bearing chamber 13. Then, the rotor shaft is inserted into the first bearing chamber 13, and with the aid of a tool for pressing the bearing, a tight fit between the rotor shaft and the first bearing 91 is achieved. The installer determines the position where the lead wire 82 of the stator assembly 8 should be placed according to the positions of the first assembly groove 41 and the second assembly groove 42, and places the stator assembly 8 into the housing 1, so that the lead wire 82 forms a 90° angle with the first assembly groove 41 and the second assembly groove 42. At the same time, the positioning protrusion 2 cooperates with the groove 81 of the stator assembly, and the limiting protrusion 3 limits the axial position of the stator assembly 8. Then, the operator covers the rear end cover 7 on the opening of the housing 1, so that the first assembly block 71 cooperates with the first assembly groove 41, the second assembly block 72 cooperates with the second assembly groove 42, and the second bearing 92 is located in the second bearing chamber 75. At the same time, the lead wire 82 passes through the lead wire groove 73, and the rear end cover 7 is riveted to the annular protrusion 5 by riveting.

Claims

1. A brushless motor that is easy to assemble, comprising a housing and a rear end cover, characterized in that: One end of the casing is open, and the inner wall of the casing is provided with at least one positioning protrusion that cooperates with the groove of the outer wall of the stator assembly; the wall of the casing corresponding to the end of the open end is provided with a first assembly groove and a second assembly groove of different sizes, and the line connecting the midpoint of the first assembly groove and the midpoint of the second assembly groove passes through the center of the casing; the circumferential outer edge of the rear end cover is provided with a first assembly block and a second assembly block corresponding to the first assembly groove and the second assembly groove respectively, and the rear end cover is also provided with a lead-out wire groove with a lateral opening, and the lead-out wire groove is arranged at a 90° angle with the first assembly block and the second assembly block.

2. The brushless motor that is easy to assemble according to claim 1, characterized in that: The first assembly groove and the second assembly groove penetrate the wall of the housing in a radial direction, and the length of the first assembly groove is greater than the length of the second assembly groove.

3. The brushless motor that is easy to assemble according to claim 1, characterized in that: A circle of annular protrusions is provided on the end face of the opening of the casing to form a stop structure; when the rear end cover is matched with the casing, the rear end cover is supported on the end face of the stop structure, and the circumferential outer wall of the rear end cover contacts and cooperates with the circumferential inner wall of the annular protrusion.

4. The brushless motor that is easy to assemble according to claim 1, 2 or 3, characterized in that: The other end of the housing is provided with a front end cover which is integrally arranged with the housing, and the inner wall of the housing close to the front end cover is provided with a plurality of annular limiting protrusions which are evenly spaced.

5. The brushless motor that is easy to assemble according to claim 4 is characterized in that: The limiting protrusion extends in the circumferential direction, the positioning protrusion extends in the axial direction, and the limiting protrusion and the positioning protrusion are both integrally arranged with the housing.

6. The brushless motor that is easy to assemble according to claim 4 is characterized in that: The front end cover is provided with a first bearing chamber extending axially outward, and the front end cover is also provided with a plurality of positioning columns extending axially inward, and the positioning columns are provided with threaded holes opening axially inward, and the front end cover is matched with a bearing fixing plate that restricts the bearing in the first bearing chamber, and the bearing fixing plate is provided with fixing holes corresponding one to one with the positioning columns.

7. The brushless motor that is easy to assemble according to claim 6, characterized in that: A plurality of the positioning columns are arranged in a ring-shaped manner with uniform intervals, and the bearing fixing plate is provided with a groove matched with the bearing.

8. The brushless motor that is easy to assemble according to claim 6, characterized in that: The rear end cover is provided with a second bearing chamber, and the openings of the first bearing chamber and the second bearing chamber are both rounded transitions.

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