CN219718015U - Brush motor - Google Patents

Abstract

The utility model discloses a brush motor, which comprises a motor body, a connector, an end cover fixed at one axial end of the motor body and a circuit board arranged at one end of the end cover far away from the motor body, wherein the end cover is provided with a plurality of grooves; the connector comprises a shell and a plurality of connecting terminals, wherein the connecting terminals are electrically connected with the circuit board, and the end cover and the shell of the connector are fixed with the connecting terminals in an integrated forming mode. The end cover and the shell of the connector are integrally formed and are fixed with the connecting terminal in the forming process, so that the end cover, the shell and the connecting terminal are integrally formed, the assembling process is omitted when the connecting strength is ensured, and the production efficiency of the brush motor is greatly improved. And the problem that the connecting terminal influences the assembly of the end cover and the shell is not considered, the connecting terminal can be directly electrically connected with the circuit board, the use quantity of motor components is reduced, and therefore the production cost of the brush motor is reduced.

Description

Brush motor

Technical Field

The utility model relates to the technical field of motors, in particular to a brush motor.

Background

A brush motor generally includes a stator, a rotor that rotates relative to the stator, and an end cap for mounting components such as brushes. The end cover is assembled with the male end (or female end) of a connector, and the male end (or female end) and the corresponding female end (or male end) are spliced together, so that the effect of conducting power supply can be realized.

The existing motor, after the end cover and the connector are independently formed, the end cover and the connector are fixedly assembled together through connecting pieces or glue, so that the assembly operation is complex, and the production efficiency of the motor is seriously affected. In order to avoid the assembly of the end cover and the connector, components such as a wiring terminal are usually arranged on the end cover and the connector, and after the end cover and the connector are assembled together, the connecting terminals of the end cover and the connector are mutually matched, such as plug-in matching, so that the conducting effect is realized, but the number of components used by the motor is increased, and the production cost of the motor is increased.

Disclosure of Invention

In view of the above, the present utility model aims to provide an improved brushed motor to solve the above-mentioned problems.

The utility model provides a brush motor, which comprises a motor body, a connector, an end cover fixed at one axial end of the motor body and a circuit board arranged at one end of the end cover far away from the motor body, wherein the end cover is provided with a plurality of grooves;

the connector comprises a shell and a plurality of connecting terminals, wherein the connecting terminals are electrically connected with the circuit board, and the end cover and the shell of the connector are fixed with the connecting terminals in an integrated forming mode.

In some embodiments, the end cover is provided with a containing cavity towards one side of the motor body, at least one pair of electric brush assemblies are arranged in the containing cavity, the electric brush assemblies are electrically connected with the circuit board, the brushed motor further comprises a rotating shaft and a commutator fixed on the rotating shaft, and the commutator is contained in the containing cavity and is in sliding contact with the electric brush assemblies.

In some embodiments, the end cap includes a bottom wall and a side wall extending from the bottom wall in an axial direction of the brushed motor, the bottom wall and the side wall collectively enclosing the receiving cavity; the connection terminal is not exposed to the receiving cavity.

In some embodiments, the end cover is provided with a first through hole, the circuit board is provided with a second through hole coaxial with the first through hole, and one end of the rotating shaft sequentially penetrates through the first through hole and the second through hole and then extends out of the circuit board.

In some embodiments, the connection terminal is L-shaped and includes a transverse portion and a longitudinal portion, the longitudinal portion is parallel to the rotating shaft, the transverse portion is perpendicular to the rotating shaft, the end of the longitudinal portion extends from the end cover and is electrically connected with the circuit board, and the end of the transverse portion extends into an inner space surrounded by the housing of the connector.

In some embodiments, the longitudinal portion of the connection terminal is buried within the sidewall.

In some embodiments, the end cap is square, the number of the side walls is 4, namely a first side wall, a second side wall, a third side wall and a fourth side wall, the housing of the connector extends transversely from the first side wall, the fourth side wall is parallel to the first side wall, and the second side wall and the third side wall are respectively connected between the first side wall and the fourth side wall.

In some embodiments, the motor body includes a housing having one end inserted into the recess and at least a portion of an outer surface of the housing being flush with a corresponding outer surface of the end cap.

In some embodiments, the connection parts of the fourth side wall, the second side wall and the third side wall are respectively provided with a mounting part, and one end of the brush assembly is fixed to one mounting part.

In some embodiments, a hall magnetic ring is fixedly sleeved on the rotating shaft, and the hall magnetic ring is positioned on one side of the circuit board away from the end cover and is spaced from the circuit board; or (b)

The other end of the rotating shaft extends out of one end, far away from the end cover, of the motor body, and the other end of the rotating shaft is sleeved with a worm wheel and used for being connected with a reduction gear box.

According to the brush motor provided by the utility model, the end cover and the shell of the connector are integrally formed and are fixed with the connecting terminal in the forming process, so that the end cover, the shell and the connecting terminal are formed into a whole, the connecting strength is ensured, meanwhile, the assembling process is omitted, and the production efficiency of the brush motor is greatly improved.

The accommodating cavity for installing the electric brush is formed in one side of the end cover, which faces the motor body, the circuit board is arranged on one side of the end cover, which is far away from the motor body, and the connecting terminal penetrates through the end cover and is embedded in the end cover and is not exposed in the accommodating cavity, so that the connecting terminal and the circuit board can be effectively protected from electric sparks and dust generated during the operation of the electric brush, the problem that the connecting terminal affects the assembly of the end cover and the shell is not considered, the connecting terminal can be directly electrically connected with the circuit board, the using quantity of motor components is reduced, and the production cost of the brush motor is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a brush motor according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of the brushed motor illustrated in FIG. 1;

FIG. 3 is an exploded schematic view of the brushed motor illustrated in FIG. 1;

FIG. 4 is a schematic view of the brushed motor of FIG. 1 with the motor body removed;

fig. 5 is a schematic view of the brushed motor of fig. 4 from another perspective with the motor body removed.

In the figure: 10. a brush motor; 12. a motor body; 14. a connector; 16. an end cap; 18. a circuit board; 20. a housing; 24. a stator; 26. an iron core assembly; 28. a rotating shaft; 30. a bearing; 32. a recess; 34. a side portion; 36. a corner; 38. a first through hole; 40. a second through hole; 41. a Hall magnetic ring; 42. a worm wheel; 44. a housing chamber; 46. a brush assembly; 48. a commutator; 50. a bottom wall; 54. a first sidewall; 56. a second sidewall; 58. a third sidewall; 60. a fourth sidewall; 62. a mounting part; 64. a housing; 66. a connection terminal; 68. a longitudinal portion; 70. a transverse portion.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.

It should be noted that, in the embodiments of the present utility model, all directional indicators (such as up, down, left, right, front, back, inner, outer, top, bottom … …) are merely used to explain the relative positional relationship between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators correspondingly change.

It will also be understood that when an element is referred to as being "fixed" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Referring to fig. 1 to 3, a brush motor 10 according to an embodiment of the present utility model includes a motor body 12, a connector 14, an end cover 16, and a circuit board 18, wherein the end cover 16 is fixed to an axial end of the motor body 12, the circuit board 18 is mounted at an end of the end cover 16 far away from the motor body 12 and electrically connected to the motor body 12, and the connector 14 is fixed to the end cover 16 and electrically connected to the circuit board 18, so that the connector 14 is electrically connected to the motor body 12. Specifically, the connector 14 includes a housing 64 and a plurality of connection terminals 66, and the end cover 16 and the housing 64 of the connector 14 are integrally formed and fixed with the connection terminals 66 in the forming process, so that the end cover 14, the connector housing 64 and the connection terminals 66 are formed into a whole, the assembly process is omitted while the connection strength is ensured, and the production efficiency of the brush motor is greatly improved. The circuit board 18 is arranged on the outer side of the end cover 16, so that the fixing operation and the electric connection operation are convenient, and meanwhile, the circuit board 18 is far away from the accommodating cavity 44 of the end cover 16 for installing the electric brush, so that the connecting terminal 66 and the circuit board 18 can be effectively protected from electric sparks and dust generated during the operation of the electric brush; in addition, the circuit board 18 is arranged on the outer side of the end cover 16, which is favorable for heat dissipation of the circuit board 18 and avoids influence on normal operation and service life of the circuit board 18 due to overhigh temperature. Specifically, the circuit board 18 is attached to the side of the end cover 16 remote from the motor body 12.

The motor body 12 comprises a shell 20, a rotor and a stator 24, wherein the rotor comprises an iron core assembly 26 and a rotating shaft 28 which is relatively fixed with the iron core assembly 26, one axial end of the shell 20 is fixedly connected with the end cover 16, the stator 24 is fixed in the shell 20, the iron core assembly 26 is arranged on the inner side of the stator 24 at intervals, and the rotating shaft 28 is rotationally connected with the shell 20. When the iron core assembly 26 rotates relative to the stator 24, the rotating shaft 28 is driven to rotate relative to the housing 20.

Preferably, bearings 30 are provided between the shaft 28 and the housing 20 and the end cap 16, respectively, and the shaft 28 is rotatably engaged with the housing 20 and the end cap 16 by the corresponding bearings 30. Bearings 30 reduce friction between shaft 28 and housing 20 and end cap 16, facilitate rotation of shaft 28, and reduce wear.

The end cap 16 is provided with a recess 32 on the outside of the axial end remote from the circuit board 18, an axial end of the housing 20 is inserted into the recess 32, and at least part of the outer surface of the housing 20 is flush with the corresponding outer surface of the end cap 16. The recess 32 is formed on the end cover 16, so that the end of the housing 20 is inserted into the recess 32, and at least part of the surface of the housing 20 is flush with part of the outer surface of the end cover 16, which is beneficial to improving the compactness of the whole structure and reducing the abrupt sense between the end cover 16 and the housing 20.

The specific shape of the casing 20 of the motor body 12 is not limited, in this embodiment, the cross-sectional shape of the casing 20 is square, and after the casing 20 is inserted into the recess 32 on the end cover 16, the casing 20 can be limited in the circumferential direction, so as to play a certain positioning effect on the motor body 12, and facilitate assembly.

Specifically, the housing 20 includes four side portions 34 and four corner portions 36 in the circumferential direction, the four side portions 34 being arranged in parallel at intervals of two, with a corner portion 36 between any adjacent two of the side portions 34. Each angle comprises two inclined walls forming a V-shape with an included angle between the two inclined walls greater than 90 °, the two inclined walls being fixed at their opposite ends, remote from each other, to two adjacent side portions 34, the stator 24 being fixed to the casing 20 at a corner 36. The V-shaped corner 36 is provided between the two side portions 34, which increases the contact area between the stator 24 and the housing 20 compared to a normal right angle, so as to perform fixing operation and improve fixing strength, and is advantageous in reducing production difficulty compared to an arc-shaped corner.

As shown in fig. 2, the end cover 16 is provided with a first through hole 38, the circuit board 18 is correspondingly provided with a second through hole 40, the first through hole 38 and the second through hole 40 are coaxially arranged and communicated, and one end of the rotating shaft 28 sequentially passes through the first through hole 38 and the second through hole 40 and extends out of the circuit board 18.

One end of the rotating shaft 28, which is positioned outside the circuit board 18, is fixedly sleeved with a Hall magnetic ring 41, and the Hall magnetic ring 41 is positioned on one side of the circuit board 18, which is far away from the end cover 16, and is spaced from the circuit board 18. The circuit board 18 or the end cover 16 can be provided with a hall sensor matched with the hall magnetic ring 41, and the hall sensor can detect the rotation condition of the rotating shaft 28, namely the rotation condition of the rotor by being matched with the hall magnetic ring 41.

The other end of the rotating shaft 28 extends out from one end of the motor body 12 away from the end cover 16, namely, one end of the rotating shaft 28 away from the end cover 16 penetrates through the shell 20 and extends out of the shell 20, a worm gear 42 is sleeved on the rotating shaft 28, and the worm gear 42 is located on one side of the shell 20 away from the end cover 16 and is used for being connected with a reduction gearbox.

As shown in fig. 3, a housing cavity 44 is disposed on a side of the end cover 16 facing the motor body 12, at least a pair of brush assemblies 46 are disposed in the housing cavity 44, the brush assemblies 46 are electrically connected with the circuit board 18, in this embodiment, the brush assemblies 46 include brush mounting arms and brushes (not shown) mounted on free ends of the brush mounting arms, the brush motor 10 further includes a commutator 48 fixed on the rotating shaft 28, and the commutator 48 is housed in the housing cavity 44 and is in sliding contact with the brushes. The commutator 48 is electrically connected to windings (not shown) of the core assembly 26 of the rotor, and the commutator 48 is in sliding contact with the brushes during rotation of the shaft 28, thereby powering the rotor windings of the motor body 12.

As shown in fig. 4, the end cover 16 includes a bottom wall 50 and a side wall extending from the bottom wall 50 in the axial direction of the brush motor 10, i.e., the axial direction of the rotating shaft 28, the bottom wall 50 and the side wall jointly enclose to form the accommodating cavity 44, the circuit board 18 is disposed on a side of the bottom wall 50 away from the side wall, the first through hole 38 is disposed through the bottom wall 50, and the recess 32 is disposed on an end of the side wall away from the bottom wall 50. The bottom wall 50 separates the circuit board 18 from the receiving cavity 44, thereby effectively protecting the circuit board 18 from sparks and dust generated during operation of the brush.

The specific shape of the end cap 16 is not limited, and in the present embodiment, the end cap 16 is square, and has four side walls, namely, a first side wall 54, a second side wall 56, a third side wall 58 and a fourth side wall 60, respectively, the first side wall 54 is spaced parallel to the fourth side wall 60, the second side wall 56 and the third side wall 58 are spaced parallel to each other and are respectively connected between the first side wall 54 and the fourth side wall 60, and the connector 14 is connected to the first side wall 54 and extends in a lateral direction, that is, in a radial direction of the brush motor 10.

The junction of the fourth side wall 60 with the second and third side walls 56, 58 is provided with a mounting portion 62 projecting inwardly, respectively, and the fixed ends of the brush mounting arms of the pair of brush assemblies 46 in the housing chamber 44 are fixed to the two mounting portions 62, respectively, i.e., one brush mounting arm is mounted on each mounting portion 62.

Referring to fig. 2 and 5, the connector 14 includes a housing 64 and a plurality of connection terminals 66, the connection terminals 66 are electrically connected to the circuit board 18, and the end cap 16 and the housing 64 of the connector 14 are fixed to the connection terminals 66 by integral molding. The end cover 16 and the housing 64 of the connector 14 are integrally formed and fixed with the connecting terminal 66 in the forming process, so that the housing 64, the connecting terminal 66 and the end cover 16 are integrally formed in an injection molding mode, the connecting strength is ensured, meanwhile, the assembling process is omitted, and the production efficiency of the brush motor 10 is greatly improved. And the connecting terminal 66 is automatically fixed with the end cover 16 and the shell 64 in the injection molding process, so that the problem that the assembly of the end cover 16 and the shell 64 is not influenced is not considered, the connecting terminal 66 of the connector 14 can be directly electrically connected with the circuit board 18 on the end cover 16, and the terminals for connecting the circuit board 18 and the connecting terminal 66 are not required to be additionally arranged in the end cover 16, so that the number of components of the brush motor 10 is reduced, and the production cost of the brush motor 10 is reduced.

The specific number of the connection terminals 66 is not limited, and may be appropriately arranged according to actual needs. In the present embodiment, the number of the connection terminals 66 is four, and the four connection terminals 66 are spaced apart from each other and are electrically connected to the circuit board 18.

In one embodiment, the connection terminals 66 are not exposed to the receiving cavities 44 of the end cap 16, i.e., the connection terminals 66 do not enter the receiving cavities 44 of the end cap 16, and the connection terminals 66 are spaced from the receiving cavities 44 and thus from components, such as brushes, within the receiving cavities 44 to prevent interference therewith and to protect the connection terminals 66 from sparks and dust generated during operation of the brushes.

The specific shape of the connection terminal 66 is not limited, and in the present embodiment, the connection terminal 66 is L-shaped, and includes a longitudinal portion 68 and a lateral portion 70 perpendicular to each other, the longitudinal portion 68 being parallel to the rotation shaft 28, i.e., extending in the axial direction of the rotation shaft 28, and the lateral portion 70 being perpendicular to the rotation shaft 28, i.e., extending in the radial direction of the rotation shaft 28. The end of the longitudinal portion 68, i.e., the end remote from the transverse portion 70, extends from the end cap 16 and is electrically connected to the circuit board 18, and the end of the transverse portion 70, i.e., the end remote from the longitudinal portion 68, extends into the interior space defined by the outside of the connector 14. The end cap 16 extends in the axial direction of the shaft 28, the circuit board 18 is located on one axial side of the end cap 16, and the housing 64 of the connector 14 extends from the end cap 16 in the radial direction of the shaft 28, and the extending directions of the end cap 16 and the housing 64 are just perpendicular, so that the connecting terminals 66 are arranged in an L-shape, the shapes of the end cap 16 and the housing 64 can be adapted, the longitudinal portions 68 thereof extend in the extending direction of the end cap 16 and are electrically connected to the circuit board 18, and the lateral portions 70 extend in the extending direction of the housing 64 and are used for the plug-fit with the other connectors 14.

Specifically, the longitudinal portion 68 of the connection terminal 66 is buried in the side wall of the end cap 16 such that the longitudinal portion 68 is spaced from the receiving cavity 44 of the end cap 16.

According to the brush motor, the end cover and the shell of the connector are integrally formed and fixed with the connecting terminal in the forming process, so that the end cover, the shell and the connecting terminal are formed into a whole, the connecting strength is ensured, meanwhile, the assembling process is omitted, and the production efficiency of the brush motor is greatly improved. And the problem that the connecting terminal influences the assembly of the end cover and the shell is not considered, the connecting terminal can be directly electrically connected with the circuit board, the use quantity of motor components is reduced, and therefore the production cost of the brush motor is reduced.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (10)

1. The brush motor is characterized by comprising a motor body, a connector, an end cover fixed at one axial end of the motor body and a circuit board arranged at one end of the end cover far away from the motor body;

the connector comprises a shell and a plurality of connecting terminals, wherein the connecting terminals are electrically connected with the circuit board, and the end cover and the shell of the connector are fixed with the connecting terminals in an integrated forming mode.

2. The brushed motor of claim 1, wherein the end cap has a housing cavity on a side facing the motor body, at least one pair of brush assemblies are disposed in the housing cavity, the brush assemblies are electrically connected to the circuit board, the brushed motor further comprises a rotating shaft and a commutator fixed to the rotating shaft, and the commutator is housed in the housing cavity and is in sliding contact with the brush assemblies.

3. The brushed motor of claim 2, wherein the end cap includes a bottom wall and a sidewall extending from the bottom wall in an axial direction of the brushed motor, the bottom wall and the sidewall collectively defining the receiving cavity; the connection terminal is not exposed to the receiving cavity.

4. The brush motor of claim 2, wherein the end cap is provided with a first through hole, the circuit board is provided with a second through hole coaxial with the first through hole, and one end of the rotating shaft sequentially passes through the first through hole and the second through hole and then extends out of the circuit board.

5. A brush motor according to claim 3, wherein the connection terminal is L-shaped and includes a transverse portion and a longitudinal portion, the longitudinal portion is parallel to the rotation shaft, the transverse portion is perpendicular to the rotation shaft, the end of the longitudinal portion extends from the end cap and is electrically connected to the circuit board, and the end of the transverse portion extends into an inner space surrounded by the housing of the connector.

6. The brush motor of claim 5 wherein said longitudinal portion of said connection terminal is embedded within said sidewall.

7. The brushed motor of claim 6 wherein said end caps are square, said side walls being 4, first, second, third and fourth side walls, respectively, said housing of said connector extending laterally from said first side wall, said fourth side wall being parallel to said first side wall, said second and third side walls being connected between said first and fourth side walls, respectively.

8. The brush motor of claim 7 wherein the outer side of the axial end of the end cap is provided with a recess, the motor body includes a housing, one end of the housing is inserted into the recess, and at least a portion of the outer surface of the housing is flush with the corresponding outer surface of the end cap.

9. The brush motor of claim 7, wherein the fourth side wall is connected to the second side wall and the third side wall by mounting portions, respectively, and one end of the brush assembly is fixed to one of the mounting portions.

10. The brush motor of claim 4, wherein a hall magnetic ring is fixedly sleeved on the rotating shaft, and the hall magnetic ring is positioned at one side of the circuit board away from the end cover and is spaced from the circuit board; or (b)

The other end of the rotating shaft extends out of one end, far away from the end cover, of the motor body, and the other end of the rotating shaft is sleeved with a worm wheel and used for being connected with a reduction gear box.