KR102101713B1 - Brush fixing device for motor - Google Patents

Abstract

The present invention relates to a brush fixing device for a motor which can increase motor quality. The brush fixing device for a motor comprises: a brush card housing (40) having an installation space (45) therein; a brush holder (52) installed in the brush card housing (40) and having a moving space (54) therein; a brush (56) movably inserted into the moving space (54) of the brush holder (52) and having a protruding part in contact with a commutator; a spring (S) installed in the moving space (54) to elastically support the brush (56) in a commutator direction; and a spring support unit (55) having a part of the brush holder (52) formed to be bent so that one opening unit of the moving space (54) is blocked and supporting the rear of the spring (S) to align a direction of the spring (S).

Description

Brush fixing device for motor

The present invention relates to a motor, and more particularly, to a brush fixing device for fixing a brush in contact with a commutator to a brush holder installed on a brush card assembly of a motor.

The motor converts electrical energy into mechanical energy, and its components can be roughly divided into a rotor (rotor) and a stator (stator). The stator is fixed, and the rotor rotates relative to the stator, where the rotor is configured to electromagnetically interact with the stator. As a result, the motor rotates by a force acting between the magnetic field generated by the stator and the rotor and the current flowing through the coil.

In general, the motor can be divided into a brush (Brush) motor and a brushless motor (BLDC motor). Among them, brush motors are widely used in general use and are used in various industrial environments because they are relatively inexpensive compared to brushless motors.

In the brush type permanent magnet motor, the brush card assembly transmits external power to the coil surrounding the internal rotor. To this end, the brush card assembly is provided with a terminal for receiving external power, a choke coil, a brush holder, and a brush. Here, the brush is in contact with a commutator installed on a drive shaft of a motor, and is elastically supported by a spring so as to be in close contact with the commutator.

However, the spring located in the brush holder does not push the center of the brush, there is a problem that the brush is twisted up / down or left / right. This is because the spring itself is not accurately fixed in the brush holder and can be moved to some extent. As such, when the brush is distorted, an abnormal current waveform occurs and performance is changed in each direction, thereby deteriorating the quality of the motor.

In addition, since the spring and the brush must be assembled in a small-sized brush holder, and in particular, the spring needs to have an accurate position in the brush holder, so there is a problem of poor assembly.

In addition, in the conventional brush holder, the inner space is open on both sides, so that the spring and the brush can be separated from the brush holder before the brush card assembly is completely assembled to the motor. In order to prevent this, a separate temporary fixing structure may be provided, but in this case, the number of parts increases or the structure becomes complicated.

Republic of Korea Registered Patent 10-0909104 Republic of Korea Patent Registration 10-1535625

The present invention is to solve the problems of the prior art as described above, the object of the present invention is to integrally support the spring supporting the brush holder to elastically support the brush in the correct direction.

Another object of the present invention is to ensure that the spring and brush are easily inserted inside the brush holder, and that the inserted spring and brush are not separated in opposite directions.

According to a feature of the present invention for achieving the above object, the present invention is a brush card housing having an installation space therein, a brush holder installed in the brush card housing and having a moving space therein, and the brush holder A brush that is movably inserted into the moving space of the protruding part and contacts the commutator, a spring installed in the moving space to elastically support the brush in the commutator direction, and the brush holder to block one opening of the moving space A part of the bend is formed and includes a spring support part that supports the rear of the spring and aligns the direction of the spring, and the brush holder includes a holder body in which a moving space is opened on both sides, and a brush extending from the holder body A fixing arm for fixing a holder to the brush card housing, and the holder body A bending part that is bent at one side and blocks one side of the moving space, and includes a spring support part supporting the rear central portion of the spring, and the spring support part is bent at the holder body to at least partially block one opening of the moving space, and the bending part It is bent in the direction of the moving space again from the part and protrudes in the spring direction and includes a protruding support end supporting the center of the spring, the spring support has an elongated cross-section, and the protruding support end comprises Supports across the left and right or up and down.

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The brush fixing device of the motor according to the present invention as described above has the following effects.

The brush holder of the present invention has a spring support part to support the spring in the forward direction. Therefore, since the spring maintains the correct direction toward the brush, the brush may not be twisted or tilted, and there is an effect of improving the quality of the motor by preventing the performance from being changed for each abnormal current waveform or direction.

In addition, since the spring support portion of the brush holder is not a separate object but is made by bending a part of the brush holder, the spring and the brush can be effectively aligned without separate parts.

In addition, in the present invention, since the spring support blocks one of the openings of the brush holder, it is possible to prevent the spring and the brush from being pulled backwards from the brush holder before being fully assembled with the motor. Therefore, there is an effect that the assembling property of the brush card assembly is improved.

1 is a perspective view showing a state of a motor to which an embodiment of the brush fixing device according to the present invention is applied.
Figure 2 is a perspective view showing an embodiment of a brush fixing device of a motor according to the present invention.
3 is a perspective view of the embodiment of FIG. 2 as viewed from below.
Figure 4 is a perspective view showing an embodiment of a brush module constituting one embodiment of Figure 2;
5 is a perspective view showing an exploded part of components constituting one embodiment of FIG. 4.
Figure 6 is a perspective view showing another embodiment of the brush module constituting the brush fixing device of the motor according to the present invention.
7 is a perspective view showing an exploded part of components constituting another embodiment of FIG. 6.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the embodiments of the present invention, when it is determined that detailed descriptions of related well-known structures or functions interfere with the understanding of the embodiments of the present invention, detailed descriptions thereof will be omitted.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), and the like can be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to the other component, but another component between each component It should be understood that may be "connected", "coupled" or "connected".

The brush card assembly 30 of the motor of the present invention can be used for various motors, and these motors can be used for various purposes and functions. For example, the present invention can be applied to electronic parking brake actuators of automobiles or various other actuators. In the following, an automobile actuator will be described as an example.

Referring to Figure 1, the actuator is the main housing 20 and the cover 80 are combined to form the entire external skeleton. When the main housing 20 and the cover 80 are combined, a shielded installation space is created in the interior, and a plurality of parts are built in the installation space to operate the actuator. When the main housing 20 and the cover 80 are assembled, only a part of the final output shaft of the connector 23 and the output unit 25 is exposed, and the rest is not exposed inside the installation space. A mating connector (not shown) is inserted into the coupling space of the connector 23.

The cover 80 is assembled to the upper side of the main housing 20, and the motor cover 10 is coupled to the motor installation part 21 side. The motor cover 10 wraps the exterior of the motor so that the motor is not exposed to the outside. The motor cover 10 is formed of a skeleton by a substantially cylindrical cover body 11, and there is a motor installation space therein. Reference numeral 22 is an installation bracket.

A brush card assembly 30 is located above the motor installation space. The brush card assembly 30 serves to receive power and signals from the outside and transmit them to the inside of the actuator. External power and signals come in through the connector 23. Although not shown, the brush card assembly 30 is connected to the commutator of the motor to supply power to the commutator, and the commutator transmits it to the coil to rotate the rotor.

The structure of the brush card assembly 30 is well illustrated in FIG. 2. The skeleton of the brush card assembly 30 is made by the brush card housing 40. The brush card housing 40 is substantially circular, and is coupled to the top of the motor. When the brush card assembly 30 and the motor are assembled, the commutator of the motor faces the brush 56 of the brush card assembly 30 to be described below. When the brush card assembly 30 and the motor are assembled, parts of the brush card assembly 30 may not be separated by being pressed by a brush guide (not shown) of the motor. The important thing is that the brush 56 is elastically supported in the correct direction towards the commutator. The structure for this will be described below.

Inside the brush card housing 40, there is an installation space 45 which is an empty space, and in the center of the installation space 45, there is a center hole 41 'into which a drive shaft of the motor is fitted. The center hole 41 'is installed in the bearing 42. A plurality of parts are installed in the installation space 45. In this embodiment, a total of two brush modules 50 are installed in the installation space 45. Here, the brush module 50 includes a brush holder 52, a brush 56, and a spring S. For reference, the brush module 50 may be four or more.

A controller board 42 is installed in the installation space 45, and a pair of terminals T1 and T2 are connected to the controller board 42. The terminals T1 and T2 are located inside the connector (not shown), and are electrically connected to the female terminal of the mating connector. The control panel 42 may be omitted or may be installed at a different location from FIG. 2.

A partition fence 46 is provided at the bottom of the installation space 45. The compartment fence 46 is to fix the brush module 50, protrudes from the bottom of the installation space 45, is composed of a pair, the brush module 50 is installed therebetween. In this embodiment, the partition fence 46 has two pairs to correspond to the number of brush modules 50.

A brush module 50 is installed between the partition fences 46 of the installation space 45. Looking at the brush module 50, the brush module 50 includes a brush holder 52, a brush 56 and a spring (S). The brush holder 52 is made integrally with the brush card housing 40. Since the brush holder 52 is not separate from the brush card housing 40, a separate assembly process for assembling the brush holder 52 to the brush card housing 40 is not required. The brush holder 52 fixes the brush 56, but has a moving space 54 so that the brush 56 can move therein. The moving space 54 is opened in the moving direction so that the brush 56 can enter and exit, and the opened direction faces the commutator.

First, when explaining the brush module 50 shown in FIGS. 4 and 5 as an example of the brush module 50, the skeleton of the brush module 50 is made by a holder body. The holder body is approximately six-sided, and there is a moving space 54 therein. The moving space 54 is opened in the front-rear direction, and the rear is at least partially blocked by a spring support 55 to be described below.

A fixed arm 52 'protrudes downward from the brush holder 52, and the fixed arm 52' extends from the brush holder 52 to fix the brush holder 52 to the brush card housing 40. To make. Referring to FIG. 3, the fixed arm 52 ′ is bent under the brush card housing 40 and the brush holder 52 is assembled to the brush card housing 40.

A moving channel 53 is opened above the holder body, and the moving channel 53 is connected to the moving space 54. The moving channel 53 extends in the same direction as the moving space 54 so that the lead wire 56a, which will be described below, can pass there. The moving channel 53 prevents the lead wire 56a from falling out in the opposite direction because its entrance is made narrow.

The holder body has a spring support (55). The spring support 55 is bent at one side of the holder body to block one side of the moving space 54. The spring support portion 55 supports the rear central portion of the spring S through this shape. The spring (S) in which the central portion is supported is not twisted in any one direction, and can be accurately installed in the longitudinal direction of the moving space (54), that is, in the direction of the brush (56).

The spring support portion 55 is composed of a bent portion 55a and a protruding support end 55b, wherein the bent portion 55a is bent at the holder body to at least partially block one opening of the moving space 54. Referring to FIG. 4, the bent portion 55a does not completely block the rear of the moving space 54, but is at least lower than the middle. Therefore, it is possible to sufficiently prevent the spring S from falling backwards.

At the end of the bent portion 55a, there is a protruding support end 55b. The protruding support end 55b is bent again in the direction of the moving space 54 in the bent portion 55a, and eventually protrudes in the spring S direction. The protruding support end (55b) supports the center of the spring (S). The protruding support end (55b) supports the rear of the spring (S) to align the direction of the spring (S).

In this embodiment, the spring support 55 has an elongated cross section. More specifically, the protruding support end (55b) is to support across the rear center of the spring (S) in the left and right direction. Therefore, the spring S can be supported in a sufficiently large area. Meanwhile, the protruding support end 55b may be made smaller than the inner diameter of the spring S and may be inserted into the spring S.

A spring S is inserted into the moving space 54, and a brush 56 is positioned in front of it. Therefore, the brush 56 is elastically supported by the spring S. The brush 56 is movably inserted into the moving space 54 of the brush holder 52, and the protruding portion contacts the commutator to apply power. The brush 56 may be moved in and out of the moving space 54, the rear is supported by the spring (S) and can be in close contact with the commutator. Can be maintained.

The lead wire 56a is located above the brush 56. The lead wire 56a conducts current, and the lead wire 56a electrically connects the brush 56 and the choke coil 51 to each other, one end of which is the choke at the other end of the brush 56 Each coil is electrically connected. Since the lead wire 56a is connected to the choke coil, power is supplied in the order of the coils wound to the terminals T1, T2-choke coil 51-brush 56-commutator-core, and the motor is rotated. You can. The lead wire 56a may be a pigtail. Reference numeral 51a denotes a portion connecting the choke coil 51 and the lead wire 56a of the brush 56.

The brush 56 is elastically supported by a spring (S). The spring (S) is fixed to the brush holder 52 and its surroundings to elastically support the spring (S), for this purpose it is located at the rear of the brush (56). In this embodiment, the spring (S) is a cylindrical coil spring (S), it is disposed on the innermost of the moving space (54). When the brush 56 is inserted into the moving space 54, the spring S is compressed and then released while pushing the brush 56 outward.

Next, the embodiments illustrated in FIGS. 6 and 7 will be described. For reference, the same structure as in the previous embodiment will be omitted and only the differences will be described. The same parts as in the previous embodiment are denoted by reference numeral 100. As shown in Figure 6, the holder body has a spring support 155. The spring support portion 155 is bent at one side of the holder body to block one side of the moving space 154. The spring support portion 155 supports the rear central portion of the spring S through this shape. The spring S in which the central portion is supported is not twisted in any one direction, and can be accurately installed in the longitudinal direction of the moving space 154, that is, in the direction of the brush 156.

The spring support part 155 is composed of a bent part 155a and a support protrusion 155b, and the bent part 155a is bent at the holder body to at least partially block one opening of the moving space 154. Referring to FIG. 6, the bent portion 155a does not completely block the rear of the moving space 154, but is at least lower than the middle. Therefore, it is possible to sufficiently prevent the spring S from falling backwards.

There is a support protrusion 155b at the end of the bent portion 155a. The support protrusion 155b protrudes in the direction of the moving space 154 again from the bent portion 155a, and eventually protrudes in the spring S direction. The support protrusion 155b supports the center of the spring S. The support protrusion 155b supports the rear of the spring S to align the direction of the spring S.

In this embodiment, the spring support portion 155 has a shape in which a central portion of the bent portion 155a protrudes in the spring (S) direction. More specifically, the support protrusion 155b is embossed at the center of the bent portion 155a to make a circular protrusion. Therefore, the spring S can be supported in a sufficiently large area. Particularly, in the present embodiment, since the support protrusion 155b is disposed concentrically with the cylindrical spring S, at least a part of the support protrusion 155b may be inserted into the spring S. Through this, more accurate alignment of the spring S is possible.

Next, looking at the process of assembling the commutator module according to the present invention, the operator first inserts the spring (S) into the moving space 54 in the holder body of the commutator holder. The spring (S) is pushed into the moving space (54), there is a bent portion (55a) is not completely separated from the rear, it is disposed on the innermost of the moving space (54). Therefore, the operator does not need to take separate measures to prevent the spring S from falling out.

In this state, a commutator is inserted in front of the spring S. The commutator is inserted through the entrance of the moving space 54, and the connected lead wire 56a can move through the moving channel 53. If the commutator is in contact with the spring (S), and pushed further while overcoming the elastic force, the spring (S) is compressed and elastically supported.

At this time, the spring (S) is supported by the protruding support end (55b) of the bent portion (55a) is aligned in the correct direction. That is, the spring S is aligned in the commutator direction, but this alignment is possible because the protruding support end 55b pushes the central portion of the spring S. Therefore, since the spring S maintains the correct direction toward the brush 56, the brush 56 may not be distorted or tilted, and it is possible to prevent the performance of each abnormal waveform or direction from being changed.

In particular, the spring support portion 55 of the brush holder 52 is made of a part of the brush holder 52 that is not a separate object, so the operator does not assemble the separate parts, the spring S and the brush 56 Can be effectively aligned, even if the spring (S) is not inserted into the moving space 54 in the correct direction, the inserted spring (S) is aligned by the spring support 55 can be corrected in the correct direction work This becomes easy.

In this state, the brush card assembly 30 including the brush holder 52 may be assembled to the motor. In the present invention, the spring support 55 blocks one of the openings of the brush holder 52, so that it is completely assembled with the motor. It prevents the spring (S) and the brush (56) from falling out of the brush holder (52).

In the above, even if all the components constituting the embodiment according to the present invention are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, if it is within the scope of the present invention, all of the components may be selectively combined and operated. In addition, the terms "include", "consist" or "have" as described above mean that the corresponding component can be intrinsic, unless specifically stated to the contrary, excluding other components. It should not be interpreted as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted as being consistent with the contextual meaning of the related art, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

10: motor cover 20: main housing
30: brush card assembly 40: brush card housing
50: brush module 52: brush holder
55: spring support 55a: bent
55b: projecting support 56: brush
S: Spring

Claims (6)

Brush card housing with installation space inside,
A brush holder installed in the brush card housing and having a moving space therein,
A brush that is movably inserted into the moving space of the brush holder and the protruding part contacts the commutator,
A spring installed in the moving space to elastically support the brush in a commutator direction,
A part of the brush holder is made to be bent so as to obstruct one opening of the moving space and includes a spring support part that supports the rear of the spring and aligns the direction of the spring,
The brush holder
The holder body is opened inside the moving space on both sides,
A fixing arm extending from the holder body to secure a brush holder to the brush card housing;
It is bent at one side of the holder body to block one side of the moving space, and includes a spring support for supporting the central portion of the rear of the spring,
The spring support
A bent portion that is bent at the holder body and at least partially blocks one opening of the moving space,
The bent portion is bent again in the direction of the moving space and includes a protruding support end protruding in the spring direction and supporting the center of the spring
The spring support portion has an elongated cross section, and the protruding support end is a brush fixing device for a motor that supports across the rear center of the spring in the left or right or up and down direction.
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