CN211296388U

CN211296388U - Hollow cup brushless motor

Info

Publication number: CN211296388U
Application number: CN202020115960.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-08-18
Anticipated expiration: 2030-01-19

Abstract

The utility model discloses a coreless brushless motor, which comprises a casing, a stator assembly and a rotor assembly coaxially sleeved in the casing, wherein the casing comprises a hollow casing and an end cover arranged at the opening end of the casing, the end cover comprises an insertion part which can be matched and inserted with the casing, and the insertion part is fixed in the casing through a limiting assembly; the limiting assembly comprises a groove circumferentially arranged on the inner wall of the shell and at least one guide groove axially arranged on the inner wall of the shell, and the guide groove is communicated with the open end of the shell and the groove; the end cover also comprises at least one boss which is arranged on the plug part and can slide in the guide groove and the groove, and the boss and the groove are matched to axially limit the relative position of the end cover and the shell; the limiting assembly further comprises at least one riveting groove arranged on the inserting part and used for riveting the shell and the end cover, the shell and the end cover are connected in the riveting groove in a riveting mode, and the relative position of the shell and the end cover is limited in the circumferential direction. The hollow cup brushless motor is simple in fixing structure and good in repeatability, production cost can be reduced, and production efficiency is improved.

Description

Hollow cup brushless motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a coreless brushless motor.

Background

The hollow cup brushless motor belongs to the DC, permanent magnet, micro-special brushless motor. The energy-saving motor has the outstanding energy-saving characteristic, the sensitive and convenient control characteristic and the stable running characteristic, and represents the development direction of the motor as a high-efficiency energy conversion device. Because of the structure, the fixing scheme of the motor end cover (including the front end cover, the rear end cover and the like) and the shell usually adopts thread fixing, C-shaped elastic pin fixing, glue fixing and the like, so that the time and the labor are wasted, and the requirement of mass production cannot be met.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's defect, a coreless brushless motor is provided.

The utility model provides a technical scheme that its technical problem adopted is:

a coreless brushless motor comprises a shell, a stator assembly and a rotor assembly, wherein the stator assembly and the rotor assembly are coaxially sleeved in the shell, the shell comprises a shell with a hollow interior and an end cover arranged at the opening end of the shell, the end cover comprises an insertion part which can be matched and inserted with the shell, and the insertion part is fixed in the shell through a limiting assembly;

the limiting assembly comprises a groove circumferentially arranged on the inner wall of the shell and at least one guide groove axially arranged on the inner wall of the shell, and the guide groove is communicated with the open end of the shell and the groove; the end cover further comprises at least one boss which is arranged on the inserting part and can slide in the guide groove and the groove, and the boss and the groove are matched to axially limit the relative position of the end cover and the shell;

the limiting assembly further comprises at least one riveting groove which is formed in the inserting portion and used for riveting the shell and the end cover, and the shell and the end cover are connected in the riveting groove in a riveting mode so as to circumferentially limit the relative position of the shell and the end cover.

Preferably, the number of the bosses is the same as the number of the guide grooves.

Preferably, the housing and the end cover are riveted and fixed through a riveting device, the limiting assembly further comprises at least one riveting part which is arranged on the housing and is matched and riveted with the riveting groove, the riveting part is riveted by the riveting device, and the riveting part is in close fit connection with the riveting groove.

Preferably, the riveting grooves and the riveting portions are the same in number, and the riveting grooves and the riveting portions are respectively and uniformly distributed on the side wall of the end cover and the side wall of the shell along the circumferential direction.

Preferably, the riveting groove further comprises a riveting bottom surface which is arranged on the inserting part and is vertical to the riveting groove, and the riveting part is tightly fitted with the riveting bottom surface.

Preferably, the groove is a circumferential groove or an arc-shaped groove along the inner wall of the shell.

Preferably, the stator assembly includes a core and a wire cup coaxially disposed with the housing, wherein the core is disposed between the housing and the wire cup.

Preferably, the rotor subassembly include the center pin and with center pin fixed connection's magnet steel, the magnet steel both ends are equipped with the balancing piece, copper sheathing, other pot head are established to center pin pot head, the spring is established to the other pot head, the copper sheathing with the spring is located two respectively the balancing piece deviates from one side of magnet steel.

Preferably, the coreless brushless motor further comprises a hall assembly and a bearing arranged in the casing, wherein the hall assembly is sleeved outside the central shaft and abuts against one end of the stator assembly.

Preferably, the end cover is including locating front end housing and the rear end cap at casing both ends, the bearing is two, respectively the butt in the front end housing with between the spring, and the rear end cap with between the copper sheathing, the front end housing with the rear end cap all is equipped with right the spacing step of bearing spacing.

The utility model discloses following beneficial effect has: the relative position of the shell and the end cover in the axial direction is limited by arranging the limiting assembly and matching the upper groove and the guide groove of the shell with the upper lug boss of the end cover; through riveting the riveting portion on the casing to the riveting groove of end cover to inject casing and end cover at the relative position of circumference, thereby fixed casing and end cover, this coreless brushless motor's fixed knot constructs simply, and good reproducibility can reduction in production cost, improves production efficiency.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the present invention showing the case and the end cap separated from each other;

FIG. 3 is a schematic view of the fixing state of the housing and the end cap of the present invention;

fig. 4 is a schematic structural view of the rotor assembly of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, a coreless brushless motor includes a casing 1, a stator assembly 2 coaxially sleeved in the casing 1, and a rotor assembly 3 coaxially sleeved in the stator assembly 2, wherein the casing 1 includes a housing 11 and an end cap 12 disposed at an opening end of the housing 11, in some embodiments, the housing 11 is a hollow cylindrical housing, two ends of the housing are open, the housing 11 may be a cylindrical housing, or may be a circular truncated cone or other cylindrical structure, and the housing 11 is a metal housing, preferably a stainless steel component; the end cap 12 is fittingly inserted into the housing 11 through the insertion portion 121 for sealing the open end of the housing 11, and in some embodiments, the end cap 12 is further provided with a through hole for receiving and fixing the rotor assembly 3. The housing 11 and the end cover 12 are limited from relative axial movement and circumferential movement by a limiting component 13.

As shown in fig. 2, the position limiting component 13 includes a groove 131 circumferentially disposed on the inner wall of the housing, at least one guide groove 132 axially disposed on the inner wall of the housing, and at least one boss 133 disposed on the insertion part 121, wherein the guide groove 132 is communicated with the open end of the housing 11 and the groove 131, and the boss 133 can slide in the guide groove 132 and the groove 131; in some embodiments, the grooves 131 are circumferential grooves along the inner wall of the housing, the number of the bosses 133 is less than or equal to the number of the guide grooves 132, and preferably, the number of the bosses 133 is equal to the number of the guide grooves 132; in other embodiments, the concave groove 131 is a plurality of arc grooves disposed on the inner wall of the housing, preferably a plurality of arc grooves are disposed on the same cross section of the housing 11, and the number of the guiding grooves 132 and the number of the bosses 133 correspond to the number of the arc grooves. The boss 133 enters the groove 131 through the guide groove 132 and slides within the groove 131 to fix the relative axial position of the end cap 12 and the housing 11. In some embodiments, the recess 131 may also serve as a glue reservoir for containing glue prior to packaging the end cap 12.

As shown in fig. 2 and fig. 3, the limiting assembly 13 further includes at least one riveting groove 134 disposed on the inserting portion 121 and used for riveting the housing 11 and the end cover 12, and at least one riveting portion 135 disposed on the housing 11 and connected with the riveting groove 134 in a tight fit manner, the housing 11 and the end cover 12 are connected to the riveting groove 134 in a riveting manner through a riveting device (not shown), and the riveting portion 135 is riveted into the riveting groove 134 through the riveting device, so as to circumferentially limit the relative position of the housing 11 and the end cover 12. After the shell 11 and the end cover 12 are axially fixed by the groove 131 and the boss 133, the riveting device rivets the shell 11 opposite to the riveting groove 134 into the riveting groove 134, the shell 11 riveted to the riveting groove 134 is a riveting portion 135, and the riveting portion 135 is in tight fit connection with the riveting groove 134 to limit the relative position of the shell 11 and the end cover 12 along the circumferential direction. In some embodiments, the number of rivets 135 is the same as the number of rivet slots 134, i.e., one rivet 135 is riveted into each rivet slot 134. The number of rivet grooves 134 is preferably 2 or more, evenly distributed along the circumference of the end cap 12. In some embodiments, the rivet slot 134 includes a rivet bottom surface perpendicular to the extending direction of the rivet slot 134, which is disposed on the insertion portion 121 and is located in the housing 11 when the end cap 12 is assembled with the housing 11, and the rivet portion 134 is riveted into the rivet slot 134 and bent downward to form a tight-fit connection, so as to fix the circumferential relative position of the end cap 12 and the housing 11. In some embodiments, it is preferable that the rivet groove 134 has an arc or rectangular cross section, but other cross-sectional shapes are also possible, and the cross-sectional shape that can accommodate the rivet 135 can be considered to fall within the scope of the present invention. In some embodiments, the rivet 135 is pre-set on the housing 11, that is, after the housing 11 and the end cap 12 are axially fixed, the rivet groove 134 is aligned with the pre-set rivet 135, and the rivet 135 is riveted into the rivet groove 134 by a riveting device; in other embodiments, the rivet 135 is not pre-set, i.e., after the housing 11 and the end cap 12 are axially fixed, the portion of the housing 11 opposite to the rivet groove 134 is deformed or cut and riveted into the rivet groove 134 by a riveting device. The present invention is directed to a riveting portion 135 that can deform and insert the riveting groove 134 into the housing 11 through a riveting device, or can cut and insert the riveting groove 134 into the housing 11 through a riveting device.

In some embodiments, end cap 12 includes a flange having a diameter greater than or equal to the diameter of the outer wall of housing 11 in addition to plug portion 121 for closing the gap between housing 11 and end cap 12.

As shown in fig. 1, the stator assembly 2 includes a core 21 and a wire cup 22 coaxially disposed with the housing 11, wherein the core 21 is disposed between the housing 11 and the wire cup 22.

As shown in fig. 1 and 4, the rotor assembly 3 includes a central shaft 31 and a magnetic steel 32 fixedly connected to the central shaft 31, in some embodiments, the magnetic steel 32 is a hollow cylindrical neodymium-iron-boron magnetic component, balance blocks 33 are disposed at two ends of the magnetic steel 32, a copper sleeve 34 is sleeved on one end of the central shaft 31, a spring 35 is sleeved on the other end of the central shaft, and the copper sleeve 34 and the spring 35 are respectively disposed on one side of the two balance blocks 33 away from the magnetic steel 32. In some embodiments, the end of the central shaft 31 passes out of a through hole in the center of the end cap.

In some embodiments, the coreless brushless motor further includes a hall element 4 and a bearing 5 disposed in the casing 1, and the hall element 4 is sleeved outside the central shaft 31 and abuts against one end of the stator assembly 2. The end cap 12 includes a front end cap 12a and a rear end cap 12b disposed at two ends of the housing 11, in some embodiments, two bearings 5 are respectively abutted between the front end cap 12a and the spring 35, and between the rear end cap 12b and the copper sleeve 34, and the front end cap 12a and the rear end cap 12b are both provided with a limiting step 122 for limiting the bearing 5.

As an embodiment of the utility model, pack into stator module 2, rotor module 3 and hall subassembly 4 and bearing 5 back in casing 11 respectively, before encapsulation end cover 12, can select to add glue in the side of recess 131 and grafting portion 121, then aim at shells inner wall's guide way 132 with boss 133 on the end cover 12, make boss 133 slide to the recess 131 along guide way 132 in, grafting portion 121 gets into in the casing 11 thereupon, the flange on the open end butt end cover 12 of casing 11, the flange is used for the open end of shutoff casing 11, and avoid spilling over of glue to a certain extent. Rotating the end cover 12 to make the boss 133 dislocated with the guide groove 132, and making the boss 133 dislocated with the guide groove 132 and the riveting groove 134, thereby completing the axial fixation of the shell 11 and the end cover 12; and riveting part of the shell 11 in the riveting groove 134 by using a riveting device, wherein the shell 11 riveted in the riveting groove 134 is a riveting part 135, and the riveting part 135 is connected on the riveting bottom surface of the riveting groove 134 in a tight fit manner, so as to complete circumferential fixing of the shell 11 and the end cover 12. The central shaft 31 extends from the through hole in the center of the front end cover 12a for connecting with an external device.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A coreless brushless motor comprises a machine shell (1), and a stator assembly (2) and a rotor assembly (3) which are coaxially sleeved in the machine shell (1), and is characterized in that the machine shell (1) comprises a shell (11) with hollow interior and two open ends and an end cover (12) arranged at the open end of the shell (11), the end cover (12) comprises an insertion part (121) which can be matched and inserted with the shell (11), the insertion part (121) is in clearance connection with the shell (11) and is fixed in the shell (11) through a limiting assembly (13);

the limiting assembly (13) comprises a groove (131) circumferentially arranged on the inner wall of the shell and at least one guide groove (132) axially arranged on the inner wall of the shell, and the guide groove (132) is communicated with the open end of the shell (11) and the groove (131); the end cover further comprises at least one boss (133) which is arranged on the plug part (121) and can slide in the guide groove (132) and the groove (131), and the boss (133) and the groove (131) are matched to axially limit the relative position of the end cover (12) and the shell (11);

the limiting assembly (13) further comprises at least one riveting groove (134) which is formed in the inserting part (121) and used for riveting the shell (11) and the end cover (12), and the shell (11) and the end cover (12) are connected to the riveting groove (134) in a riveting mode so as to circumferentially limit the relative position of the shell (11) and the end cover (12).

2. The coreless brushless motor of claim 1, wherein the number of the bosses (133) is the same as the number of the guide grooves (132).

3. The coreless brushless motor of claim 1, wherein the housing (11) and the end cap (12) are riveted and fixed by a riveting device, the limiting assembly (13) further includes at least one riveting portion (135) which is arranged on the housing (11) and is matched and riveted with the riveting groove (134), the riveting portion (135) is riveted by the riveting device, and the riveting portion (135) is tightly matched and connected with the riveting groove (134).

4. The coreless brushless motor of claim 3, wherein the riveting grooves (134) and the riveting portions (135) are equal in number, and the riveting grooves (134) and the riveting portions (135) are circumferentially and uniformly distributed on the side wall of the end cover (12) and the side wall of the housing (11), respectively.

5. The coreless brushless motor of claim 4, wherein the rivet groove (134) further includes a rivet bottom surface provided on the insertion portion (121) and perpendicular to a direction of the rivet groove (134), and the rivet portion (135) is tightly fitted to the rivet bottom surface.

6. The coreless brushless motor of claim 1, wherein the recess (131) is a circumferential or arcuate slot along the inner wall of the housing.

7. The coreless brushless motor of claim 1, wherein the stator assembly (2) is coaxially sleeved within the housing (1) and includes a core (21) and a wire cup (22) coaxially disposed with the housing (11), wherein the core (21) is disposed between the housing (11) and the wire cup (22).

8. The coreless brushless motor of claim 7, wherein the rotor assembly (3) is coaxially sleeved in the stator assembly (2) and includes a central shaft (31) and a magnetic steel (32) fixedly connected to the central shaft (31), balancing blocks (33) are disposed at two ends of the magnetic steel (32), a copper sleeve (34) is sleeved at one end of the central shaft (31), a spring (35) is sleeved at the other end of the central shaft, and the copper sleeve (34) and the spring (35) are respectively disposed at one side of the two balancing blocks (33) departing from the magnetic steel (32).

9. The coreless brushless motor of claim 8, further comprising a hall element (4) and a bearing (5) disposed in the housing (1), wherein the hall element (4) is sleeved outside the central shaft (31) and abuts against one end of the stator assembly (2).

10. The coreless brushless motor of claim 9, wherein the end cap (12) includes a front end cap (12a) and a rear end cap (12b) disposed at two ends of the housing (11), the two bearings (5) are respectively abutted between the front end cap (12a) and the spring (35) and between the rear end cap (12b) and the copper sleeve (34), and the front end cap (12a) and the rear end cap (12b) are both provided with a limiting step (122) for limiting the bearing (5).