CN112886751A - Low-noise permanent magnet direct current motor - Google Patents
Low-noise permanent magnet direct current motor Download PDFInfo
- Publication number
- CN112886751A CN112886751A CN202110061039.4A CN202110061039A CN112886751A CN 112886751 A CN112886751 A CN 112886751A CN 202110061039 A CN202110061039 A CN 202110061039A CN 112886751 A CN112886751 A CN 112886751A
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- arc
- rotor
- permanent magnet
- carbon brush
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/14—Means for supporting or protecting brushes or brush holders
- H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/15—Mounting arrangements for bearing-shields or end plates
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
Abstract
The invention discloses a low-noise permanent magnet direct current motor, which solves the technical problem that the permanent magnet direct current motor in the prior art has larger noise when working, and comprises a shell and a rotating shaft, wherein one end of the rotating shaft extends out of the shell, a commutator fixed on the rotating shaft and a carbon brush contacted with the commutator to transmit current are arranged in the shell, the inner side surface of the carbon brush comprises an axial cambered surface and a connecting inclined surface which are axially connected, one end of the connecting inclined surface is connected with the axial cambered surface, the other end of the connecting inclined surface inclines towards the outer side direction of the shell and is connected with the end surface of the carbon brush, and the axial cambered surface is in surface-to-surface contact with the outer peripheral surface.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of permanent magnet direct current motors, in particular to a low-noise permanent magnet direct current motor.
[ background of the invention ]
The traditional permanent magnet direct current motor is applied to the push rod or the upright post structure and has the problem of high noise. Along with the improvement of living standard, the consumer requires higher and higher to the motor noise, and the noise level of current motor can't satisfy customer's demand. The motor noise is generated due to mechanical noise, electromagnetic noise, aerodynamic noise, and the like. The motor inside push rod or stand does not all take the fan, so aerodynamic's noise is very low, and the main noise source is mechanical noise and electromagnetic noise, need research and develop a low noise permanent magnetism direct current motor for this reason to promote user's use and experience.
[ summary of the invention ]
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a low-noise permanent magnet direct current motor, and the noise generated by friction can be effectively reduced by reducing the contact area between a carbon brush and a commutator, so that the noise of the motor is effectively reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a low noise permanent magnetism direct current motor, includes that casing and one end stretch out the outer pivot of casing, be equipped with in the casing and fix in the epaxial commutator with the commutator contact is with the carbon brush of transfer current, the medial surface of carbon brush includes axial connection's axial cambered surface and connection inclined plane, the one end of connecting the inclined plane with axial cambered surface connection, the other end is towards casing outside direction slope and is connected with the terminal surface of carbon brush, the axial cambered surface with the outer peripheral face of commutator forms the face-to-face contact.
Further, the vertical height of the axial cambered surface is H, the axial height of the carbon brush is H1, and H/H1 is more than or equal to 0.05 and less than or equal to 0.2. Furthermore, a lubricating oil layer is arranged on the surface of the carbon brush.
Further, the casing includes the casing, and is used for sealing front end housing and the rear end cap at both ends around the casing, the one end of pivot is run through front end housing stretches out outside the casing, the other end of pivot with be equipped with the bearing between the rear end cap, it has lubricating grease to fill between pivot and the bearing.
Further, be equipped with in the casing and fix epaxial rotor and symmetry cover are established two magnet steel in the rotor outside, the magnet steel includes first segmental arc and locates the second segmental arc at first segmental arc both ends, the thickness of second segmental arc is less than the thickness of first segmental arc.
Furthermore, the center of the second arc-shaped section is deviated from the center of the first arc-shaped section.
Furthermore, the rotor comprises a rotor chip and a rotor winding, a plurality of rotor chutes for embedding the rotor winding are arranged on the rotor chip at intervals in the circumferential direction, and the rotor chutes are inclined by half of the rotor slot pitch.
Furthermore, the rotor core piece comprises a yoke fixed on the rotating shaft and T-shaped teeth arranged on the outer side of the yoke at uniform intervals in the circumferential direction, the T-shaped teeth are arranged in a manner of inclining towards the same direction along the axial direction of the yoke, and the rotor inclined groove is formed between every two adjacent T-shaped teeth.
Furthermore, the T-shaped tooth comprises a tooth root section and a tooth crown section, wherein the tooth root section extends along the radial direction of the yoke part, the tooth crown section is concentrically arranged with the yoke part, the tooth root section is arranged between the yoke part and the tooth crown section, and the outer side surface of the tooth crown section is provided with an axially through groove; or the thicknesses of the two circumferential ends of the tooth crown section are smaller than the thickness of the middle part of the tooth crown section.
Further, the T-shaped tooth includes the edge radial extension's of yoke portion tooth root section and with the concentric crown section that sets up of yoke portion, the tooth root section is located yoke portion with between the crown section, the lateral surface of crown section include with the concentric arcwall face that sets up of yoke portion with locate the side cut inclined plane at arcwall face both ends, be equipped with the recess that the axial link up on the arcwall face.
The invention has the beneficial effects that:
compared with the prior art that the whole inner side surface of the carbon brush is in surface-to-surface contact with the outer peripheral surface of the commutator, the inner side surface of the carbon brush only has the axial cambered surface to be in contact with the outer peripheral surface of the commutator, so that the contact area of the carbon brush and the commutator is greatly reduced, the friction noise is reduced, the friction noise belongs to mechanical noise, the noise of a motor is reduced, the use experience of a user is improved, and in addition, the stable transmission current of the carbon brush is also ensured; and secondly, the inner side surface of the carbon brush is formed by connecting the axial cambered surface and the connecting inclined surface, so that the structure is simpler, the processing and forming of the inner side surface of the carbon brush are facilitated, and the processing and manufacturing cost is reduced.
The vertical height of the axial cambered surface is H, the axial height of the carbon brush is H1, and H/H1 is more than or equal to 0.05 and less than or equal to 0.2. By the design, the carbon brush can stably transmit current, the contact area of the carbon brush and the commutator can be effectively reduced, and friction noise is effectively reduced.
And a lubricating oil layer is arranged on the surface of the carbon brush. By the design, the friction coefficient of the carbon brush and the commutator is effectively reduced, and further the friction noise is further reduced.
The casing includes the casing and is used for front end housing and the rear end cap at both ends around the closed casing, and outside the front end housing was run through to the one end of pivot stretched out the casing, was equipped with the bearing between the other end of pivot and the rear end cap, and it has lubricating grease to fill between pivot and the bearing. By the design, the friction coefficient between the rotating shaft and the bearing can be effectively reduced, and further the friction noise is further reduced.
The shell is internally provided with a rotor fixed on the rotating shaft and two magnetic steels symmetrically sleeved outside the rotor, each magnetic steel comprises a first arc-shaped section and second arc-shaped sections arranged at two ends of the first arc-shaped section, and the thickness of each second arc-shaped section is smaller than that of the corresponding first arc-shaped section. By the design, the waveform of the air gap flux density of the motor can be effectively improved by changing the shape of the magnetic steel, so that the air gap flux density is close to sinusoidal distribution, the space harmonic of the air gap flux density is effectively weakened, the electromagnetic torque fluctuation is reduced, and the electromagnetic noise generated by the motor is reduced.
The circle center of the second arc-shaped section deviates from the circle center of the first arc-shaped section. By the design, the air gap flux density can be further close to the sinusoidal distribution, so that the electromagnetic torque fluctuation is further reduced, and the electromagnetic noise generated by the motor is reduced.
The rotor comprises a rotor chip and a rotor winding, a plurality of rotor chutes for embedding the rotor winding are arranged on the rotor chip at intervals in the circumferential direction, and the rotor chutes are inclined by half of the rotor slot pitch. By the design, the cogging torque of the motor can be reduced, so that the additional torque is weakened, and the effect of reducing the electromagnetic noise of the motor is achieved.
The T-shaped teeth comprise tooth root sections extending along the radial direction of the yoke part and tooth crown sections arranged concentrically with the yoke part, the tooth root sections are arranged between the yoke part and the tooth crown sections, and the outer side surfaces of the tooth crown sections are provided with axially-through grooves; or the thicknesses of the two circumferential ends of the tooth crown section are smaller than the thickness of the middle part of the tooth crown section. So design, can effectively reduce the weight and the inertia of rotor to this ripple torque that reduces the motor makes its even running, and then reduces the electromagnetic noise of motor.
The T-shaped tooth comprises a tooth root section extending along the radial direction of the yoke part and a tooth crown section arranged concentrically with the yoke part, the tooth root section is arranged between the yoke part and the tooth crown section, the outer side face of the tooth crown section comprises an arc-shaped face arranged concentrically with the yoke part and side-cutting inclined planes arranged at two ends of the arc-shaped face, and grooves which are axially communicated are formed in the arc-shaped face. By the design, the weight and the moment of inertia of the rotor can be further reduced, so that the ripple torque of the motor is further reduced, and the motor can run more stably.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention is further described below with reference to the accompanying drawings:
fig. 1 is an exploded view of a portion of a permanent magnet dc motor in accordance with a preferred embodiment of the present invention;
fig. 2 is a cross-sectional view of a permanent magnet dc motor in a preferred embodiment of the present invention;
FIG. 3 is a schematic view of the carbon brush and the commutator in accordance with the preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of the magnetic steel and the housing in the preferred embodiment of the present invention;
FIG. 5 is a schematic view of a commutator mounted on a rotating shaft according to a preferred embodiment of the present invention;
FIG. 6 is a top view of a commutator in a preferred embodiment of the invention;
fig. 7 is a schematic structural diagram of a commutator segment in the preferred embodiment of the invention.
[ detailed description ] embodiments
The invention provides a low-noise permanent magnet direct current motor which comprises a shell and a rotating shaft, wherein one end of the rotating shaft extends out of the shell, a commutator fixed on the rotating shaft and a carbon brush which is contacted with the commutator to transmit current are arranged in the shell, the inner side surface of the carbon brush comprises an axial arc surface and a connecting inclined surface which are axially connected, one end of the connecting inclined surface is connected with the axial arc surface, the other end of the connecting inclined surface inclines towards the outer side direction of the shell and is connected with the end surface of the carbon brush, and the axial arc surface is in surface-to-surface contact with the outer peripheral surface of the commutator.
Compared with the prior art that the whole inner side surface of the carbon brush is in surface-to-surface contact with the outer peripheral surface of the commutator, the inner side surface of the carbon brush only has the axial cambered surface to be in contact with the outer peripheral surface of the commutator, so that the contact area of the carbon brush and the commutator is greatly reduced, the friction noise is reduced, the friction noise belongs to mechanical noise, the noise of a motor is reduced, the use experience of a user is improved, and in addition, the stable transmission current of the carbon brush is also ensured; and secondly, the inner side surface of the carbon brush is formed by connecting the axial cambered surface and the connecting inclined surface, so that the structure is simpler, the processing and forming of the inner side surface of the carbon brush are facilitated, and the processing and manufacturing cost is reduced.
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Referring to fig. 1 to 3, the low-noise permanent magnet dc motor according to the preferred embodiment includes a housing 100 and a rotating shaft 200 having one end extending out of the housing 100, a commutator 300 fixed on the rotating shaft 200 and a carbon brush 400 contacting with the commutator 300 to transmit current are disposed in the housing 100, the carbon brush 400 is fixed in the housing 100 through a bracket, an inner side surface of the carbon brush 400 includes an axial arc surface 410 and a connection inclined surface 420, the connection inclined surface 420 is an inclined plane or an inclined arc surface, the axial arc surface 410 is matched with an outer circumferential surface of the commutator 300, an upper end of the axial arc surface 410 is flush with an upper end surface of the carbon brush, an upper end of the connection inclined surface 420 is connected with a lower end of the axial arc surface 410, a lower end of the connection inclined surface 420 is inclined toward an outer side of the housing and connected with a lower end surface of the carbon brush, that is, the inner side surface of the carbon brush is formed by connecting the.
Compared with the prior art that the whole inner side surface of the carbon brush is in surface-to-surface contact with the outer peripheral surface of the commutator, only the axial arc surface 410 of the inner side surface of the carbon brush is in contact with the outer peripheral surface of the commutator 300 in the embodiment, so that the contact area between the carbon brush 400 and the commutator 300 is greatly reduced, the friction noise is reduced, the friction noise belongs to mechanical noise, the noise of the motor is reduced, the use experience of a user is improved, and in addition, the stable transmission current of the carbon brush 400 is also ensured; secondly, the structure of the inner side surface of the carbon brush in the embodiment is simple, the processing and forming of the inner side surface of the carbon brush are facilitated, and the processing and manufacturing cost is reduced.
Preferably, in this embodiment, the vertical height of the axial arc surface 410 is H, the axial height of the carbon brush is H1, H/H1 is greater than or equal to 0.05 and less than or equal to 0.2, and when H/H1 is less than 0.5, the contact area between the carbon brush 400 and the commutator 300 is too small, which affects the current transmission effect; when the H/H1 is greater than 0.2, the contact area of the carbon brush 400 and the commutator 300 is too large, which causes too large mechanical noise, and therefore, in this embodiment, the H/H1 is preferably 0.1, so that the design can ensure that the carbon brush 400 can stably transmit current, and can effectively reduce the contact area of the carbon brush 400 and the commutator 300, thereby effectively reducing friction noise. Of course, H/H1 may also be, but is not limited to, 0.05, 0.08, 0.12, 0.15, 0.18, 0.2, etc. alternatively.
It will be appreciated that in other embodiments of the invention, the axial arc is provided at the bottom of the connecting ramp; or the inner side surface of the carbon brush comprises an axial arc surface and two connecting inclined surfaces which are axially connected, the axial arc surface is connected between one ends of the two connecting inclined surfaces, and the other ends of the two connecting inclined surfaces incline towards the outer side direction of the shell and are respectively connected with the end surfaces of the carbon brush.
In order to further reduce the friction noise between the carbon brush 400 and the commutator 300, a lubricating oil layer is arranged on the surface of the carbon brush in this embodiment, so that the friction coefficient between the carbon brush 400 and the commutator 300 is effectively reduced, and the friction noise is further reduced.
The housing 100 in this embodiment includes a casing 110, and a front end cover 120 and a rear end cover 130 for closing front and rear ends of the casing 110, wherein one end of the rotating shaft 200 penetrates through the front end cover 120 and extends out of the housing 100, a bearing 140 is disposed between the other end of the rotating shaft 200 and the rear end cover 130, and lubricating grease is filled between the rotating shaft 200 and the bearing 140. By the design, the friction coefficient between the rotating shaft 200 and the bearing 140 can be effectively reduced, and further the friction noise is further reduced.
In addition, as shown in fig. 4, in this embodiment, the casing 100 is further provided with a rotor 500 fixed on the rotating shaft 200 and two magnetic steels 600 symmetrically sleeved outside the rotor 500, the magnetic steel 600 is arc-shaped and includes a first arc-shaped section 610 and second arc-shaped sections 620 arranged at two ends of the first arc-shaped section 610, and the thickness of the second arc-shaped section 620 is smaller than that of the first arc-shaped section 610. By the design, the waveform of the air gap flux density of the motor can be effectively improved by changing the shape of the magnetic steel 600, so that the air gap flux density is close to sinusoidal distribution, the space harmonic of the air gap flux density is effectively weakened, the electromagnetic torque fluctuation is reduced, and the electromagnetic noise generated by the motor is reduced.
Specifically, the internal surface and the surface of magnet steel in this embodiment are the arcwall face, and the both ends of surface are equipped with scarf 621, and wherein the part that scarf 621 corresponds forms second arc section 620, and the part that lies in between two scarf 621 then forms first arc section 610, so design, can effectively reduce magnet steel 600's the processing degree of difficulty.
Of course, it is understood that the inner surface and the outer surface of the second arc-shaped section are both concentric arc-shaped surfaces, the thickness of the second arc-shaped section is smaller than that of the first arc-shaped section, and the circle center of the second arc-shaped section is arranged to deviate from the circle center of the first arc-shaped section. By the design, the air gap flux density can be further close to the sinusoidal distribution, so that the electromagnetic torque fluctuation is further reduced, and the electromagnetic noise generated by the motor is reduced.
As shown in fig. 5 to 7, the rotor 500 of the present embodiment includes a rotor core and a rotor winding (not shown), the rotor core is provided with a plurality of rotor slots 510 at intervals in the circumferential direction for embedding the rotor winding, and the rotor slots 510 are inclined by half of the rotor slot pitch. By the design, the cogging torque of the motor can be reduced, so that the torque fluctuation of the motor is reduced, and the effect of reducing the electromagnetic noise of the motor is achieved.
Specifically, the rotor core piece in this embodiment is formed by axially stacking a plurality of segments 520, each segment 520 includes a yoke 521 fixed on the rotating shaft 200 and T-shaped teeth 522 circumferentially and uniformly spaced outside the yoke 521, and when the segments 520 are stacked, the T-shaped teeth 522 are inclined in the same direction along the axial direction of the yoke 521, so that the rotor skewed slot 510 is formed between two adjacent T-shaped teeth 522. T type tooth 522 includes along the radial tooth root section that extends of yoke 521 and the tooth crown section that sets up with yoke 521 is concentric, the tooth root section is located between yoke 521 and the tooth crown section, the lateral surface of tooth crown section includes the arcwall face that sets up with yoke 521 is concentric and locates the side cut inclined plane 5222 at arcwall face both ends, side cut inclined plane 5222 make the thickness at tooth crown section circumference both ends be less than the thickness at tooth crown section middle part, be equipped with the recess 5221 that the axial link up on the arcwall face, so design, can effectively reduce rotor 500's weight and inertia, with this ripple torque that reduces the motor, make its even running, and then reduce the electromagnetic noise of motor.
It will be appreciated that in other embodiments of the invention, the outer lateral surface of the crown segment is provided with at least one axially through groove; or the thicknesses of the two circumferential ends of the tooth crown section are smaller than the thickness of the middle part of the tooth crown section, so that the waveform of the air gap flux density of the motor is effectively improved, the air gap flux density is close to sinusoidal distribution, the space harmonic of the air gap flux density is effectively weakened, the ripple torque of the motor is reduced, and the electromagnetic noise generated by the motor is reduced.
In addition, the low-noise permanent magnet direct current motor in the embodiment can be used in a push rod or lifting upright post structure to improve the use experience of users.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. The utility model provides a low noise permanent magnetism direct current motor, includes that casing and one end stretch out the outer pivot of casing, be equipped with in the casing and fix epaxial commutator and with the commutator contact is with the carbon brush of transmission current, its characterized in that, the medial surface of carbon brush includes axial connection's axial cambered surface and connection inclined plane, the one end of connecting the inclined plane with axial cambered surface connection, the other end is towards casing outside direction slope and be connected with the terminal surface of carbon brush, the axial cambered surface with the outer peripheral face of commutator forms the face-to-face contact.
2. The low-noise permanent magnet direct current motor according to claim 1, wherein the vertical height of the axial arc surface is H, the axial height of the carbon brush is H1, and H/H1 is 0.2.
3. A low noise permanent magnet dc motor according to claim 1, wherein a surface of the carbon brush is provided with a lubricating oil layer.
4. The low-noise permanent magnet direct current motor according to claim 1, wherein the housing includes a casing, and a front end cover and a rear end cover for closing front and rear ends of the casing, one end of the rotating shaft penetrates through the front end cover and extends out of the casing, a bearing is disposed between the other end of the rotating shaft and the rear end cover, and lubricating grease is filled between the rotating shaft and the bearing.
5. The low-noise permanent magnet direct current motor according to any one of claims 1 to 4, wherein a rotor fixed on the rotating shaft and two magnetic steels symmetrically sleeved outside the rotor are arranged in the housing, the magnetic steels include a first arc-shaped section and second arc-shaped sections arranged at two ends of the first arc-shaped section, and the thickness of the second arc-shaped section is smaller than that of the first arc-shaped section.
6. The low noise permanent magnet dc motor of claim 5, wherein the center of the second arc segment is offset from the center of the first arc segment.
7. A low noise permanent magnet DC motor according to any one of claims 1 to 4, wherein the rotor comprises a rotor core and a rotor winding, the rotor core is provided with a plurality of rotor chutes at intervals in the circumferential direction for embedding the rotor winding, and the rotor chutes are inclined by half of the rotor slot pitch.
8. The low-noise permanent magnet direct current motor according to claim 7, wherein the rotor core piece comprises a yoke fixed on the rotating shaft and T-shaped teeth circumferentially and uniformly spaced outside the yoke, the T-shaped teeth are inclined in the same direction along the axial direction of the yoke, and the rotor inclined slot is formed between two adjacent T-shaped teeth.
9. The low noise permanent magnet dc motor according to claim 8, wherein the T-shaped teeth include a tooth root section extending along the radial direction of the yoke portion and a tooth crown section concentrically arranged with the yoke portion, the tooth root section is arranged between the yoke portion and the tooth crown section, and an outer side surface of the tooth crown section is provided with an axially through groove; or the thicknesses of the two circumferential ends of the tooth crown section are smaller than the thickness of the middle part of the tooth crown section.
10. The low-noise permanent magnet direct current motor according to claim 8, wherein the T-shaped teeth include a tooth root section extending along a radial direction of the yoke portion and a tooth crown section arranged concentrically with the yoke portion, the tooth root section is arranged between the yoke portion and the tooth crown section, an outer side surface of the tooth crown section includes an arc-shaped surface arranged concentrically with the yoke portion and cut-edge inclined surfaces arranged at two ends of the arc-shaped surface, and the arc-shaped surface is provided with axially through grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110061039.4A CN112886751A (en) | 2021-01-18 | 2021-01-18 | Low-noise permanent magnet direct current motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110061039.4A CN112886751A (en) | 2021-01-18 | 2021-01-18 | Low-noise permanent magnet direct current motor |
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| Publication Number | Publication Date |
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| CN112886751A true CN112886751A (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110061039.4A Pending CN112886751A (en) | 2021-01-18 | 2021-01-18 | Low-noise permanent magnet direct current motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421665A (en) * | 2021-12-17 | 2022-04-29 | 浙江鸿音机电科技有限公司 | Power transmission assembly of inflator pump |
-
2021
- 2021-01-18 CN CN202110061039.4A patent/CN112886751A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421665A (en) * | 2021-12-17 | 2022-04-29 | 浙江鸿音机电科技有限公司 | Power transmission assembly of inflator pump |
| CN114421665B (en) * | 2021-12-17 | 2023-09-29 | 浙江鸿音机电科技有限公司 | Power transmission assembly of inflator pump |
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