CN215498545U - Mute brushless direct current motor - Google Patents

Abstract

The utility model discloses a mute brushless direct current motor which comprises an outer rotor, a stator and a metal bearing assembly, wherein a rotor shaft core is installed in the outer rotor, the stator is installed in the outer rotor in a manner of rotating around the rotor shaft core through the metal bearing assembly, the metal bearing assembly comprises a metal bearing seat and a bearing installed in the metal bearing seat, the stator is installed on the outer side wall of the metal bearing seat, the bearing is installed in the metal bearing seat and surrounds the rotor shaft core, a bearing buffer ring is arranged between the metal bearing seat and the bearing, the bearing buffer ring comprises an annular strip-shaped body, and the inner side and the outer side of the bearing buffer ring respectively abut against the metal bearing seat and the bearing. Compared with the prior art, set up the bearing buffer ring in the metal bearing subassembly between stator and rotor shaft core for the rotation of rotor is steady, and it is little to prevent vibration and noise, prevents to lose bearing inner wall, long service life.

Description

Mute brushless direct current motor

Technical Field

The utility model relates to a motor product, in particular to a mute brushless direct current motor.

Background

The existing direct current brushless motor generally comprises a rotor, a stator, a circuit board, a bearing sleeve and a bearing arranged in the bearing sleeve, wherein a rotor shaft core is arranged in the middle of the rotor, the bearing is arranged on the rotor shaft core, the stator is arranged on the bearing sleeve of the bearing and is positioned outside the bearing sleeve, and a magnetic ring of the rotor is positioned outside the stator.

The bearing seat of the small direct current brushless motor is usually an aluminum alloy or zinc alloy die casting, and does not need to be precisely machined, more importantly, two bearings are simultaneously arranged on the bearing seat, theoretically: the actually measured circle centers of the two bearing chambers on the bearing seat are difficult to be concentric, the included angle between the connecting line of the two circle centers and the theoretical central axis of the two bearing chambers is greatly influenced by the distance between the two bearing chambers, the larger the distance is, the smaller the included angle is, the closer the distance is, the larger the included angle is, and the distance between the two bearing chambers of the bearing seat is usually smaller and generally less than 20mm, so that the dislocation angle of the two bearing chambers is very large, namely when a bearing and a shaft are installed, the concentricity of the bearing and the shaft is very poor, if the dislocation angle is larger than the angle clearance range of the bearing, the relative stress of the shaft and the bearing damages the inner wall of the bearing, the noise and the service life are shortened, and the radial clearance and the angle clearance of the compact micro deep groove ball bearing used by the micro motor are very small.

Therefore, a brushless dc motor capable of solving the above problems is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mute brushless direct current motor, wherein a bearing buffer ring with a buffer bulge is arranged in a metal bearing assembly between a stator and a rotor shaft core, so that the structure between a bearing and a rotor in the metal bearing assembly is stable, and the rotation is stable.

In order to achieve the purpose, the utility model discloses a mute brushless direct current motor which comprises an outer rotor, a stator and a metal bearing assembly, wherein a rotor shaft core is installed in the outer rotor, the stator is installed in the outer rotor in a manner of rotating around the rotor shaft core through the metal bearing assembly, the metal bearing assembly comprises a metal bearing seat and a bearing installed in the metal bearing seat, the stator is installed on the outer side wall of the metal bearing seat, the bearing is installed in the metal bearing seat and surrounds the rotor shaft core, a bearing buffer ring is arranged between the metal bearing seat and the bearing, the bearing buffer ring comprises an annular belt-shaped body, and the inner side and the outer side of the bearing buffer ring respectively abut against the metal bearing seat and the bearing.

Compared with the prior art, the utility model has the advantages that the bearing buffer ring is arranged in the metal bearing assembly between the stator and the rotor shaft core, and the bearing buffer ring can arrange a buffer zone between the metal bearing seat and the bearing, so that the relative position between the metal bearing seat and the bearing is more compact and stable, the stator arranged on the metal bearing seat is effectively prevented from generating inclined vibration in the rotation process of the rotor shaft core, the core element structure of the whole mute brushless direct current motor is stable, the rotation of the rotor is stable, the vibration is prevented, the noise is low, the impact with the inner side wall of the bearing is reduced when the rotor rotates, and the service life is prolonged.

Preferably, the bearing includes along the rotor shaft core install in last bearing and lower bearing in the metal bearing frame, the metal bearing frame includes around the rotor shaft core and follows rotor shaft core from lower cavity and the last cavity that upwards forms, lower cavity is located the outer rotor is inboard, it is located the outer rotor upside to go up the cavity, the stator install in on the lateral wall of cavity down, go up the bearing install in go up the inside wall of cavity with between the rotor shaft core, the conflict of bearing cushion collar install in go up between the inside wall of cavity and the lateral wall of upper bearing, lower bearing install in the inside wall of cavity down with between the rotor shaft core. The bearing buffer ring is arranged in the upper cavity on the outer upper side of the stator and the rotor instead of the cavity of the bearing seat in the rotor, so that the buffer force of the bearing buffer ring is prevented from influencing the stator, the bearing buffer ring is far away from the lower end part of the rotor shaft core, the rotor shaft core rotates stably under the stability of two points with far distances between the lower end part and the bearing buffer ring, and the inclination is prevented from being cheap. The bearing buffer ring effectively reduces the distance between the upper bearing and the rotor shaft core, so that the concentricity of the bearing buffer ring is better, the dislocation angle between the upper bearing and the lower bearing is reduced, the inner wall of the upper bearing cannot be damaged due to stress when the rotor rotates, the service life is long, and the cost is low.

Specifically, the lower chamber is divided into an installation chamber and a separation chamber for separating the installation chamber from the upper chamber from the lower chamber, and the lower bearing is installed in the installation chamber. The spacing chamber enlarges the distance between the upper bearing and the lower bearing, reduces the dislocation angle between the upper bearing and the lower bearing and further enables the rotor to rotate stably relative to the bearing.

Specifically, the diameter of the upper chamber is longer than that of the lower chamber, so that a first mounting step is formed between the lower chamber and the outer side wall of the upper chamber, and a circuit board is sleeved on the outer side wall of the lower chamber and mounted at the first mounting step. The circuit board supplies power for a stator winding of the direct current motor core.

Specifically, a second mounting step is further formed between the inner side walls of the lower chamber and the upper chamber, and a gasket is arranged between the lower ends of the upper bearing and the bearing buffer ring and the second mounting step, so that the upper bearing and the bearing buffer ring are stably mounted.

Preferably, the inner surface of the belt-shaped body is convexly provided with a plurality of buffer bulges which are abutted against the bearing along the circumferential direction of the inner surface and/or the belt-shaped body is formed by injection molding of a flexible material. The internal surface of bearing buffering circle is provided with a plurality of elastic buffering archs that have along circumference, and this buffering arch supports the bearing from a plurality of directions for the contact between metal bearing frame and the bearing is more stable.

Preferably, the plurality of buffer protrusions are block-shaped or dot-shaped and are arranged in at least two rows along the axial direction of the belt-shaped body, and each row of the buffer protrusions is provided with a plurality of buffer protrusions which are distributed in the circumferential direction of the belt-shaped body. The buffer bulges are arranged into a plurality of rows along the axial direction, so that the area of the buffer bulges is small, the provided elasticity is large, the contact stability between the metal bearing seat and the bearing is ensured, the bearing and the metal bearing seat adopt dispersive contact along the axial direction, the elasticity is balanced, and the reliability between the bearing and the metal bearing seat is relieved. Moreover, the multirow elastic bulge that sets up along the axial still makes bearing and metal bearing frame independently variable along its axial elasticity dispersion for the contact between bearing and the metal bearing frame along its axial is more stable balanced, and especially is better to the bearing frame effect that has certain draft.

Preferably, the banded body is metal body, the buffering arch by metal body punching press forms, metal body is bent into cyclic annular by the strap and forms, simple structure, easily processing.

Preferably, the band-shaped body is a metal body, and an opening axially penetrates through the metal body to enable the metal body to be in an open-loop structure. Simple structure, it is with low costs, can effectually prevent that the bearing from deviating the rotation axle center.

Preferably, the metal bearing seat is a zinc alloy bearing seat, and the bearing is an oil bearing or a rolling bearing.

Preferably, the upper end of the metal bearing seat protrudes outwards around the central axis thereof to form a plurality of groups of thread hole pieces, each group of thread hole pieces comprises an installation sheet and a first thread hole and a second thread hole which are arranged on the installation sheet in a penetrating manner, the three groups of thread hole pieces are arranged along the central axis of the metal bearing seat at equal angles, and the radial length of the first thread hole is not equal to the radial length of the second thread hole. The scheme enables the direct current motor to be provided with loads of different specifications.

Specifically, the diameter length of the first thread hole is 3mm, the diameter length of the second thread hole is 4mm, and a larger load can be installed in the 4mm second thread hole.

Specifically, three groups of thread hole pieces are axially and outwards extended from the upper end of the metal bearing seat around the center of the metal bearing seat. Of course, the thread hole member may be formed by four groups, five groups, etc.

Preferably, the outer rotor comprises an outer rotor shell of the motor and an outer rotor magnetic ring, the outer rotor shell of the motor comprises an end shell and an annular side wall forming a mounting cavity, the rotor shaft core is mounted on the end shell, the outer rotor magnetic ring is mounted in the annular side wall, and the stator is mounted in the outer rotor magnetic ring.

Drawings

Fig. 1 is a three-dimensional structural view of a mute brushless dc motor according to the present invention.

Fig. 2 is a side view of a quiet brushless dc motor according to the present invention.

Fig. 3 is a cross-sectional view of the quiet brushless dc motor of the present invention taken along the center line of the rotor shaft core.

Fig. 4 is a sectional view taken along line a-a of fig. 2.

Fig. 5 is a partially exploded perspective view of the mute brushless dc motor according to the present invention.

Fig. 6 is a fully exploded perspective view of the mute brushless dc motor of the present invention.

Fig. 7 is a partially enlarged view of fig. 4.

Fig. 8 is a schematic structural view of the bearing buffer ring of the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1 to 8, the utility model discloses a silent brushless dc motor 100, comprising an outer rotor 10, a stator 20 and a metal bearing assembly 30, wherein a rotor shaft core 11 is installed in the outer rotor 10; the stator 20 is rotatably mounted in the outer rotor 10 around the rotor shaft core 11 through a metal bearing assembly 30; the metal bearing assembly 30 comprises a metal bearing seat 31 and a bearing installed in the metal bearing seat 31, and a bearing buffer ring 33 is arranged between the metal bearing seat 31 and the bearing. The stator 20 is mounted on the outer side wall of the metal housing 31. The bearing buffer ring 33 comprises an annular metal body 331, and the inner side and the outer side of the bearing buffer ring 33 respectively abut against the metal bearing seat and the bearing.

Preferably, an opening 332 axially penetrates the metal body 331 so that the metal body 331 has an open-loop structure, which facilitates the adjustment of the axial center of the bearing buffer ring 33 to match the bearing and the metal bearing seat 31.

The metal bearing seat 31 is a zinc alloy bearing seat, and the bearing is an oil bearing or a rolling bearing.

Referring to fig. 3, the metal bearing housing 31 includes a lower chamber 301 and an upper chamber 302 formed around the rotor shaft core 11 from bottom to top, the lower chamber 301 is located inside the outer rotor 10, the upper chamber 302 is located on the upper side of the outer rotor 10, the stator 20 is mounted on the outer sidewall of the lower chamber 301, the bearing includes an upper bearing 32 and a lower bearing 34, the upper bearing 32 is mounted in the upper chamber 302, and the lower bearing 34 is mounted in the lower chamber 301 and between the inner sidewall of the lower chamber 301 and the rotor shaft core 11. Rotor shaft core 11 has a separation preventing member 111 fixed to the upper end of upper chamber 302 to prevent upper bearing 33 from separating from upper chamber 302.

In the present embodiment, the upper bearing 32 is a rolling bearing, but the upper bearing 32 may be an oil bearing.

In the present embodiment, the lower bearing 34 is a rolling bearing, but the lower bearing 34 may be an oil bearing.

The upper bearing 32 and the lower bearing 34 may be the same type of bearing or different types of bearings, for example, the upper bearing 32 is a rolling bearing and the lower bearing 34 is an oil bearing.

Referring to fig. 3 and 6, the diameter of the upper chamber 302 is longer than that of the lower chamber 301, so that a first mounting step 303 is formed between the lower chamber 302 and the outer sidewall of the upper chamber 301, a circuit board 40 is sleeved on the outer sidewall of the lower chamber 301 and mounted at the step of the first mounting step 303, and fixed by a fixing block 41, referring to fig. 3, the fixing block 41 is provided with a threaded hole, and a screw passes through the threaded hole to fix the circuit board 40 on the metal bearing seat 31. The circuit board supplies power for a stator winding of the direct current motor core.

Referring to fig. 3 and 6, in particular, a second mounting step 304 is further formed between the inner side walls of the lower chamber 301 and the upper chamber 302, and gaskets 35 and 36 are arranged between the lower ends of the upper bearing 32 and the bearing buffer ring 33 and the second mounting step 304, so that the upper bearing 32 and the bearing buffer ring 33 are stably mounted. The washer 35 is a flat washer, and the washer 36 is a wavy elastic washer. A gasket 37 is provided between the lower bearing 34 and the sidewall of the upper end of the lower chamber 301.

Referring to fig. 1, a plurality of sets of thread hole pieces 311 protrude outward from the upper end of the metal bearing seat 31 in the axial direction of the center thereof, each set of thread hole piece 311 includes a mounting plate 312 and a first thread hole 313 and a second thread hole 314 penetrating the mounting plate 312, the three sets of thread hole pieces 311 are disposed at equal angles along the center axis of the metal bearing seat, and the length of the first thread hole 313 is not equal to the length of the second thread hole 314. The scheme enables the direct current motor to be provided with loads of different specifications. Specifically, the first thread hole 313 has a diameter length of 3mm, and the second thread hole 314 has a diameter length of 4 mm. Three sets of screw thread hole pieces 311 are protruded outwards from the upper end of the metal bearing seat 31 in the axial direction around the center thereof, and the number of the screw thread hole pieces 311 is not limited to three sets, and may be four sets, five sets, six sets, and the like.

Referring to fig. 3 and 6, the outer rotor 10 includes an outer rotor case 12 and an outer rotor magnetic ring 13, the outer rotor case 12 includes an end case 121 and an annular sidewall 122 forming a mounting cavity, the rotor shaft core 11 is mounted at the center of the end case 121, the outer rotor magnetic ring 13 is mounted in the annular sidewall 122, and the stator 20 is mounted in the outer rotor magnetic ring 13.

Referring to fig. 3, 7 and 8, preferably, the inner surface of the metal body 331 is protruded with a plurality of buffer protrusions 333 abutting against the upper bearing 32 along the circumferential direction thereof. Wherein, the other side of the buffer protrusion 333 is recessed from the outer sidewall of the metal body 331. According to the utility model, the bearing buffer ring 33 is arranged in the metal bearing assembly 30 between the stator 20 and the rotor shaft core 11, the inner surface of the bearing buffer ring 33 is circumferentially provided with a plurality of elastic buffer protrusions 333, and the buffer protrusions 333 prop against the outer side wall of the bearing 32 from multiple directions, so that the contact between the metal bearing seat 31 and the bearing 32 is more stable, the concentricity of the bearing 32 and the rotor shaft core 11 is better, and the rotation of the motor rotor is stable.

Referring to fig. 8, preferably, the buffer protrusions 333 are in a block shape or a dot shape and are arranged in at least two rows along the axial direction of the metal body 331, and each row of the buffer protrusions 33 has a plurality of buffer protrusions distributed over the circumferential direction of the metal body 331. Wherein each row of the buffer protrusions 33 is arranged at equal intervals. Of course, the buffer protrusions may also be strip-shaped and protrude on the inner surface of the metal body 331 in parallel with the axial direction of the metal body 331 or at an acute angle.

Referring to fig. 7 and 8, the buffer protrusion 333 is formed by deforming an outer surface of the metal body 331 to be inwardly recessed, and a plurality of grooves 24 are formed on the outer surface of the metal body 331 while the buffer protrusion 333 is formed on an inner surface of the metal body 331.

Specifically, the buffer protrusion 333 is stamped from the metal body 331.

Preferably, the metal body 331 is formed by bending a metal strip into a ring shape, and has a simple structure and is easy to process. The opening 332 is formed between the ends of the metal strip.

In this embodiment, the metal body 331 is made of stainless steel, but the annular body may be made of other elastic metal materials, such as spring steel, carbon steel, and so on.

The bearing buffer ring 33 may be in the form of a straight strip or a slightly curved metal strip before use, and when in use, two ends of the metal strip are recessed inwards and directly mounted in the bearing chamber 11, and the shape of the metal strip is set according to the hole wall of the bearing chamber 11, so as to form the annular bearing buffer ring 33.

Referring to fig. 6, in this embodiment, two rows of buffer protrusions 333 are disposed on the metal body 331 along the axial direction thereof, and the two rows of buffer protrusions 333 are aligned side by side so that the two rows of buffer protrusions 333 are opposite to each other. Of course, the two rows of the buffer protrusions on the metal body of the bearing buffer ring can also be arranged side by side in a staggered manner.

Referring to fig. 7 and 8, the bottom surface of the buffer protrusion 333 is a flat surface, and the side surface of the buffer protrusion 333 is an outwardly bent arc surface. Of course, the side surface of the buffer protrusion 333 may be a slope. The buffer protrusion 333 is in this embodiment in the form of a table with a small top and a large bottom.

In this embodiment, the heights of the two rows of the buffering protrusions 333 are equal. Of course, the heights of the two rows of buffer protrusions 333 may also be different, and the heights correspond to the draft angles of the inner walls of the upper chamber 302 of the metal bearing housing 31.

Referring to fig. 8, the lower end of the metal body 331 is bent and extended toward the center of the metal body 331 at a certain interval along the circumference thereof to form a plurality of press feet 334. When the upper bearing 32 is installed in the bearing buffer ring 33, the presser foot 334 can be pressed to prevent the bearing buffer ring 33 from moving along the axial direction along with the operation of the motor and even separating from the upper chamber 302 of the upper bearing 32 and the metal bearing seat 31, and a retainer ring is not required to be arranged. The plurality of press feet 334 are evenly distributed along the periphery of the metal body 331.

In this embodiment, the bearing buffer ring is an open ring, but the bearing buffer ring may also be a closed ring.

In this embodiment, the bearing buffer ring is made of metal, and in other embodiments, the bearing buffer ring may also be made of other materials with flexibility, so that the belt-shaped body of the bearing buffer ring has an elastic buffer function, for example, plastic, and at this time, the bearing buffer ring may not have a buffer protrusion, but only buffer by the elasticity of its own material, and two side surfaces of the belt-shaped body respectively abut against the outer side wall of the upper bearing 32 and the inner side wall of the upper chamber 302.

Referring to fig. 3, in order to increase the distance between the upper bearing 32 and the lower bearing 34 so that the rotor shaft core 11 operates more smoothly, the lower chamber 301 is divided into a mounting chamber and a partition chamber 3012 which partitions the mounting chamber and the upper chamber from bottom to top, and the lower bearing 34 is mounted in the mounting chamber 3011. The installation cavity 3011 and the spacing cavity 3012 are separated by a partition wall 3013 having a predetermined thickness, and the partition wall 3013 is provided with a through hole for the rotor shaft core 11 to pass through.

Referring to fig. 6, in order to facilitate the installation of the stator 20, a plurality of fixing ribs 315 are axially disposed on the outer sidewall of the lower chamber 301, the fixing ribs 315 are bar-shaped and axially disposed along the rotor shaft core, a bar-shaped groove matched with the fixing ribs 315 is disposed on the inner sidewall of the stator 20, and when the stator 20 is installed on the outer sidewall of the lower chamber 301, the fixing ribs 315 are inserted into the bar-shaped groove in a matching manner.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims (10)

1. A mute brushless direct current motor is characterized in that: the outer rotor is internally provided with a rotor shaft core, the stator is rotatably arranged in the outer rotor by winding the rotor shaft core through the metal bearing assembly, the metal bearing assembly comprises a metal bearing seat and a bearing arranged in the metal bearing seat, the stator is arranged on the outer side wall of the metal bearing seat, the bearing is arranged in the metal bearing seat and surrounds the rotor shaft core, a bearing buffer ring is arranged between the metal bearing seat and the bearing, the bearing buffer ring comprises an annular strip-shaped body, and the inner side and the outer side of the bearing buffer ring respectively abut against the metal bearing seat and the bearing.

2. A silent brushless dc motor as claimed in claim 1, wherein: the bearing includes the edge the rotor shaft core install in last bearing and lower bearing in the metal bearing frame, the metal bearing frame includes around the rotor shaft core is followed rotor shaft core is from lower cavity and the last cavity that upwards forms down, lower cavity is located the external rotor is inboard, it is located to go up the cavity the external rotor upside, the stator install in on the lateral wall of cavity down, go up the bearing install in go up the inside wall of cavity with between the rotor shaft core, the conflict of bearing cushion collar install in go up between the inside wall of cavity and the lateral wall of upper bearing, lower bearing install in the inside wall of cavity down with between the rotor shaft core.

3. A silent brushless dc motor as claimed in claim 2, wherein: the lower cavity is divided into an installation cavity and a separation cavity for separating the installation cavity from the upper cavity from bottom to top, and the lower bearing is installed in the installation cavity.

4. A silent brushless dc motor as claimed in claim 2, wherein: the diameter length of the upper cavity is larger than that of the lower cavity, so that a first mounting step is formed between the lower cavity and the outer side wall of the upper cavity, and a circuit board is sleeved on the outer side wall of the lower cavity and mounted at the first mounting step.

5. A silent brushless dc motor as claimed in claim 1, wherein: the belt-shaped body is a metal body, and an opening axially penetrates through the metal body so that the metal body is of an open-loop structure.

6. A silent brushless dc motor as claimed in claim 1, wherein: the inner surface of the belt-shaped body is convexly provided with a plurality of buffer bulges which are abutted against the bearing along the circumferential direction of the inner surface and/or the belt-shaped body is formed by injection molding of a flexible material.

7. A silent brushless dc motor as claimed in claim 6, wherein: the belt-shaped body is a metal body, the buffering bulge is formed by punching the metal body, and the metal body is formed by bending a metal belt into a ring shape.

8. A silent brushless dc motor as claimed in claim 6, wherein: the buffer bulges are in block shape or dot shape and are arranged into at least two rows along the axial direction of the belt-shaped body, and each row of the buffer bulges is provided with a plurality of peripheral bulges which are fully distributed on the belt-shaped body.

9. A silent brushless dc motor as claimed in claim 1, wherein: the metal bearing seat is a zinc alloy bearing seat, and the bearing is an oil bearing or a rolling bearing.

10. A silent brushless dc motor as claimed in claim 1, wherein: the upper end of metal bearing frame has multiunit screw tooth hole spare around its central axis evagination, and every group screw tooth hole spare includes the installation piece and runs through to be located a first screw tooth hole and a second screw tooth hole on the installation piece, three groups the screw tooth hole spare is followed the center pin equiangular setting of metal bearing frame, just the path length in first screw tooth hole is not equal to the path length in second screw tooth hole.

Images