A good-riveting-resistant and heat-dissipating brushless motor structure

Abstract

The utility model discloses a kind of brushless motor structures of good riveting pressure resistance and heat dissipation, it includes mandrel, rotor assembly, stator assembly, motor shell, rotor assembly, stator assembly are respectively located inside the motor shell, the front end of mandrel is riveted and installed worm outside motor shell and stretches out;Motor shell rear end portion is equipped with bearing seat, bearing seat is provided with support column, stator assembly is tightly packed in the periphery of support column;Rotor assembly includes magnetic ring, rotor inner shell, the inner shell connecting portion of rotor inner shell is fastened riveting with mandrel;Bearing seat is provided with through hole, mandrel rear end portion is inserted into through hole;The front end of mandrel is rotatably connected with motor shell by first bearing, mandrel rear end portion is rotatably connected with support column by second bearing, mandrel is tightly packed with graphite gasket group between the inner shell connecting portion of rotor inner shell and first bearing. By the above structure design, the utility model has the advantages of novel design, good structural stability and good heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and in particular to a brushless motor structure with good heat dissipation and resistance to riveting. Background Technology

[0002] A brushless DC motor consists of a motor body and a driver, and is a typical mechatronic product. Because a brushless DC motor operates in a self-controlled manner, it does not require an additional starting winding on the rotor like a synchronous motor that starts under heavy load with frequency conversion speed regulation, nor does it experience oscillation or loss of synchronism when the load changes abruptly.

[0003] Among them, the Chinese utility model patent with patent number ZL202021001023.1 and patent name: a brushless DC motor driven gear and worm gear parking device, in essence discloses a brushless motor. Specifically, the brushless motor disclosed in the above-mentioned brushless DC motor driven gear and worm gear parking device includes a motor body, a rotor permanent magnet, a stator core, and a worm shaft. The lower part of the worm shaft is placed in the motor body, and the lower end of the worm shaft is engaged with the groove of the motor body through a sliding bearing. A gasket is provided in the groove at the lower end of the worm shaft.

[0004] For the aforementioned brushless motors, specifically the case where the worm gear is riveted to the motor shaft, during the riveting process, the motor body is clamped and fixed using a riveting fixture. The force applied during riveting directly acts on the gasket and the end cap of the motor body. If the riveting force is too great, it can cause indentations to be pressed into the gasket and the end cap of the motor body. When the motor is energized, the contact between the shaft end and the gasket changes from point contact to spherical wrapping contact. This results in high frictional resistance, loud motor noise, uneven rotation, and shaft overheating due to friction, ultimately affecting the stability and reliability of the motor. Furthermore, the motor body's internal structure is not connected to the outside environment, leading to poor heat dissipation. Utility Model Content

[0005] The purpose of this invention is to provide a brushless motor structure with good heat dissipation and resistance to riveting in order to address the shortcomings of the existing technology. This brushless motor structure with good heat dissipation and resistance to riveting is novel in design, has good structural stability, and has a good heat dissipation effect.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0007] A brushless motor structure with good heat dissipation and resistance to riveting includes a spindle, a rotor assembly, a stator assembly, and a motor housing. The rotor assembly and the stator assembly are located inside the motor housing. The spindle is connected to the rotor assembly. The front end of the spindle extends to the outside of the motor housing, and a worm gear is riveted to the front end of the spindle.

[0008] The stator assembly includes a stator core and a coil winding wrapped around the stator core, and the rotor assembly includes a magnetic ring surrounding the periphery of the stator assembly;

[0009] The rear end of the motor housing is equipped with a bearing seat, and the bearing seat is provided with a support column that protrudes forward and extends into the motor housing. The support column and the bearing seat are an integral structure, and the stator core of the stator assembly is fitted and fastened to the periphery of the support column.

[0010] The rotor assembly also includes a rotor inner shell located inside the motor housing, a magnetic ring being fastened to the rotor inner shell, and an inner shell connecting part being fastened and riveted to the spindle.

[0011] The bearing housing has a vertical through hole that passes through the core of the support column. The rear end of the spindle extends into the through hole of the bearing housing. The front end of the spindle is rotatably connected to the motor housing through the first bearing, and the rear end of the spindle is rotatably connected to the support column of the bearing housing through the second bearing. The spindle is fitted with a graphite gasket assembly located between the inner shell connection part of the rotor inner shell and the first bearing. The graphite gasket assembly is composed of several graphite gaskets stacked together.

[0012] The portion of the mandrel extending into the through hole is provided with a shaft shoulder, and the inner wall of the through hole is provided with an inner wall shoulder. The second bearing is located between the shaft shoulder and the inner wall shoulder.

[0013] The first bearing and the second bearing are both oil-impregnated bearings, and an auxiliary graphite gasket fitted around the mandrel is provided between the second bearing and the shaft shoulder.

[0014] The first bearing is an oil-impregnated bearing, and the second bearing is a ball bearing.

[0015] The first bearing and the second bearing are both ball bearings.

[0016] The bearing housing is fastened with a PCB circuit board located inside the motor housing, and the coil windings of the stator assembly are electrically connected to the PCB circuit board.

[0017] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0018] 1. Because the through hole of the bearing housing is a through-hole structure, the rear end of the mandrel is exposed. During the process of riveting the worm gear to the front end of the mandrel, the riveting fixture can directly contact the rear end of the positioning mandrel without contacting other parts of the positioning motor, and can withstand greater riveting force. Compared with the prior art, this utility model does not have the problem of the shim pressing out a pit when riveting the worm gear, that is, it does not have the problems of high frictional resistance, high motor noise, poor rotation, and shaft heating caused by friction. The overall structure is more stable and reliable.

[0019] 2. Because the through hole connects the inside of the motor housing with the outside, this structural design can effectively improve the heat dissipation of the motor core.

[0020] 3. Therefore, the brushless motor structure of this utility model with good heat dissipation and resistance to riveting has the advantages of novel design, good structural stability and good heat dissipation effect. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0024] Figure 3 This is a cross-sectional schematic diagram of the first embodiment of the present invention.

[0025] Figure 4 This is a cross-sectional schematic diagram of the second embodiment of the present invention.

[0026] Figure 5 This is a cross-sectional schematic diagram of the third embodiment of the present invention.

[0027] exist Figures 1 to 5 This includes:

[0028] 1-Mandrel; 11-Shaft shoulder; 2-Rotor assembly; 21-Magnetic ring; 22-Rotor inner shell; 221-Inner shell connection; 3-Stator assembly; 31-Stator core; 32-Coil winding; 4-Motor housing; 5-Worm; 6-Bearing seat; 61-Support column; 62-Through hole; 63-Inner wall shoulder; 71-First bearing; 72-Second bearing; 81-Graphite gasket assembly; 82-Auxiliary graphite gasket; 9-PCB circuit board. Detailed Implementation

[0029] The present invention will now be described in conjunction with specific embodiments.

[0030] Example 1, as Figures 1 to 5 As shown, a brushless motor structure with good heat dissipation and rivet resistance includes a spindle 1, a rotor assembly 2, a stator assembly 3, and a motor housing 4. The rotor assembly 2 and the stator assembly 3 are located inside the motor housing 4. The spindle 1 is connected to the rotor assembly 2. The front end of the spindle 1 extends to the outside of the motor housing 4, and a worm gear 5 is riveted to the front end of the spindle 1.

[0031] Among them, such as Figures 3 to 5 As shown, the stator assembly 3 includes a stator core 31 and a coil winding 32 wrapped around the stator core 31, and the rotor assembly 2 includes a magnetic ring 21 surrounding the stator assembly 3.

[0032] Furthermore, such as Figures 2 to 5 As shown, a bearing seat 6 is installed at the rear end of the motor housing 4. The bearing seat 6 is provided with a support column 61 that protrudes forward and extends into the interior of the motor housing 4. The support column 61 and the bearing seat 6 are an integral structure. The stator core 31 of the stator assembly 3 is fitted and fastened to the periphery of the support column 61.

[0033] Furthermore, such as Figures 3 to 5 As shown, the rotor assembly 2 also includes a rotor inner shell 22 located inside the motor housing 4. The magnetic ring 21 is fastened to the rotor inner shell 22. The rotor inner shell 22 is provided with an inner shell connecting part 221, which is fastened and riveted to the spindle 1.

[0034] In addition, such as Figures 2 to 5 As shown, the bearing housing 6 has a through hole that extends vertically through and passes through the core of the support column 61. The rear end of the spindle 1 extends into the through hole of the bearing housing 6. The front end of the spindle 1 is rotatably connected to the motor housing 4 through the first bearing 71, and the rear end of the spindle 1 is rotatably connected to the support column 61 of the bearing housing 6 through the second bearing 72. The spindle 1 is fitted with a graphite gasket assembly 81 located between the inner shell connection part 221 of the rotor inner shell 22 and the first bearing 71. The graphite gasket assembly 81 is composed of several graphite gaskets stacked together.

[0035] It needs to be explained that, such as Figures 3 to 5 As shown, the portion of the spindle 1 that extends into the through hole 62 is provided with a shaft shoulder 11, and the inner wall of the through hole 62 is provided with an inner wall shoulder 63. The second bearing 72 is located between the shaft shoulder 11 and the inner wall shoulder 63.

[0036] In this embodiment, the bearing housing 6 can be directly riveted to the rear end of the motor housing 4, so that the motor housing 4 and the bearing housing 6 form an integral structure. The spindle 1 is rotatably mounted on the above integral structure through the first bearing 71 and the second bearing 72. The shaft shoulder 11 cooperates with the inner wall shoulder 63 of the through hole 62 to achieve axial positioning of the second bearing 72.

[0037] For the graphite gasket group 81 in this embodiment, its function is: on the one hand, to limit the axial movement of the rotor assembly 2 and reduce the frictional resistance when the spindle 1 rotates.

[0038] It should be emphasized that, for the brushless motor structure with good riveting resistance and heat dissipation in this embodiment, since the through hole 62 of the bearing seat 6 is a through hole structure, the rear end of the spindle 1 is exposed. During the process of riveting and installing the worm 5 to the front end of the spindle 1, the riveting fixture can directly contact the rear end of the positioning spindle 1 without contacting other parts of the positioning motor, and can withstand greater riveting force. Compared with the prior art, the brushless motor structure with good riveting resistance and heat dissipation in this embodiment will not cause the problem of the shim being pressed into a pit when riveting the worm 5, that is, it will not cause problems such as high frictional resistance, high motor noise, poor rotation, and shaft heating caused by friction. The overall structure has better stability and reliability.

[0039] It should be further noted that, since the through hole 62 connects the interior of the motor housing 4 with the outside, this structural design can effectively improve the heat dissipation of the motor core.

[0040] In summary, the brushless motor structure of this embodiment with good heat dissipation and resistance to riveting, through the above structural design, has the advantages of novel design, good structural stability and good heat dissipation effect.

[0041] Example 2, as Figure 3 As shown, the difference between this embodiment 2 and embodiment 1 is that the first bearing 71 and the second bearing 72 are oil-impregnated bearings, and an auxiliary graphite gasket 82 fitted around the mandrel 1 is provided between the second bearing 72 and the shaft shoulder 11.

[0042] Among them, the auxiliary graphite gasket 82 can effectively reduce the friction between the spindle 1 and the second bearing 72.

[0043] Example 3, as Figure 4 As shown, the difference between this embodiment 3 and embodiment 2 is that the first bearing 71 is an oil-impregnated bearing and the second bearing 72 is a ball bearing.

[0044] By replacing the oil-impregnated bearing with a ball bearing in the second bearing 72, the following effects are achieved: quieter operation, better consistency, smoother and more stable rotation, less wobble and tilting, less frictional resistance, and lower drive current.

[0045] Example 4, as Figure 5 As shown, the difference between this embodiment four and embodiment three is that the first bearing 71 and the second bearing 72 are ball bearings.

[0046] By replacing the oil-impregnated bearing 71 with a ball bearing, and making both the first bearing 71 and the second bearing 72 ball bearings, the following effects are achieved: quieter operation, better consistency, smoother and more stable rotation, less wobbling and tilting, less frictional resistance, and lower drive current.

[0047] Example 5, as Figures 2 to 5 As shown, the difference between this fifth embodiment and the first embodiment is that: the bearing housing 6 is fastened with a PCB circuit board 9 located inside the motor housing 4, and the coil winding 32 of the stator assembly 3 is electrically connected to the PCB circuit board 9.

[0048] It needs to be explained that, such as Figure 2 As shown, the brushless motor structure with good heat dissipation and rivet resistance in this embodiment has a notch between the bearing seat 6 and the motor housing 4, which facilitates the extension of the connection line of the PCB circuit board 9.

[0049] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A brushless motor structure with good heat dissipation and rivet resistance, comprising a spindle (1), a rotor assembly (2), a stator assembly (3), and a motor housing (4), wherein the rotor assembly (2) and the stator assembly (3) are located inside the motor housing (4), the spindle (1) is connected to the rotor assembly (2), the front end of the spindle (1) extends to the outside of the motor housing (4), and a worm gear (5) is riveted to the front end of the spindle (1); The stator assembly (3) includes a stator core (31) and a coil winding (32) wrapped around the stator core (31), and the rotor assembly (2) includes a magnetic ring (21) surrounding the stator assembly (3). Its features are: The rear end of the motor housing (4) is equipped with a bearing seat (6), and the bearing seat (6) is provided with a support column (61) that protrudes forward and extends into the interior of the motor housing (4). The support column (61) and the bearing seat (6) are an integral structure, and the stator core (31) of the stator assembly (3) is fitted and fastened to the periphery of the support column (61). The rotor assembly (2) also includes a rotor inner shell (22) located inside the motor housing (4), a magnetic ring (21) is fastened to the rotor inner shell (22), the rotor inner shell (22) is provided with an inner shell connecting part (221), and the inner shell connecting part (221) is fastened and riveted to the spindle (1); The bearing housing (6) has a through hole (62) that runs vertically through and passes through the core of the support column (61). The rear end of the spindle (1) extends into the through hole (62) of the bearing housing (6). The front end of the spindle (1) is rotatably connected to the motor housing (4) through the first bearing (71). The rear end of the spindle (1) is rotatably connected to the support column (61) of the bearing housing (6) through the second bearing (72). The spindle (1) is fitted with a graphite gasket assembly (81) located between the inner shell connecting part (221) of the rotor inner shell (22) and the first bearing (71). The graphite gasket assembly (81) is composed of several graphite gaskets stacked together.

2. The brushless motor structure with good heat dissipation and resistance to riveting as described in claim 1, characterized in that: The portion of the spindle (1) that extends into the through hole (62) is provided with a shaft shoulder (11), and the inner wall of the through hole (62) is provided with an inner wall shoulder (63). The second bearing (72) is located between the shaft shoulder (11) and the inner wall shoulder (63).

3. The brushless motor structure with good heat dissipation and resistance to riveting as described in claim 2, characterized in that: The first bearing (71) and the second bearing (72) are respectively oil-impregnated bearings, and an auxiliary graphite gasket (82) fitted around the mandrel (1) is installed between the second bearing (72) and the shaft shoulder (11).

4. The brushless motor structure with good heat dissipation and resistance to riveting as described in claim 2, characterized in that: The first bearing (71) is an oil-impregnated bearing, and the second bearing (72) is a ball bearing.

5. The brushless motor structure with good heat dissipation and resistance to riveting as described in claim 2, characterized in that: The first bearing (71) and the second bearing (72) are ball bearings.

6. The brushless motor structure with good heat dissipation and resistance to riveting as described in claim 1, characterized in that: The bearing housing (6) is fastened with a PCB circuit board (9) located inside the motor housing (4), and the coil winding (32) of the stator assembly (3) is electrically connected to the PCB circuit board (9).

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