Brush-type motor

Abstract

A brush-type motor, according to the present invention, comprises: a stator; a rotor; a brush making contact with the rotor; and a brush hold for securing the brush, wherein the brush hold is formed in a pocket shape into which the brush is inserted, a guide slot is formed in a side surface of the brush, and a guide means is provided to the brush hold. The guide means includes a guide rail which is provided in one side surface of the brush hold and is formed so as to be projected toward the inside of the brush hold so as to be fitted into the guide slot. The guide rail is formed by inwardly bending any one front end among two front ends which are formed by bisecting the one surface of the brush hold in the length direction. The guide means includes a guide wire which is mounted in one side surface of the brush hold and protrudes toward the inside of the brush hold. The guide slot is formed so as to extend in the length direction of the brush and is formed in each of side surfaces of the brush which face each other, and the guide means includes leaf springs which are mounted in the brush hold so as to be fitted into the respective guide slots. The guide means includes torsion springs which are mounted in the brush hold so as to be fitted into the respective guide slots.

Description

brush-type motor

[0001] The present invention relates to a brush-type motor, and more specifically, to a brush-type motor that reduces noise generated by the brush colliding with a brush holder by suppressing the phenomenon of the brush shaking due to vibration in a structure where the commutator and the brush come into contact.

[0002]

[0003] As shown in FIG. 1, the brush-type motor comprises a stator (2), a rotor (3), a commutator (4) attached to the surface of the rotor (3), and a brush (5) in contact with the commutator (4) to supply power.

[0004] The brush (5) is inserted into a pocket-shaped brush holder (6), and the inside of the brush holder (6) is equipped with a spring (7) that presses the brush (5) outward.

[0005] The commutator (4) is a cylindrical contact divided by the number of turns so that current can flow through each winding of the rotor (3) to become an electromagnet, and in the case of 2 poles (number of permanent magnet poles of the stator) and 10 slots (number of turns of the rotor), the commutator (4) is also divided into 10.

[0006] Meanwhile, in automobiles, brush-type motors are applied to convenience features such as adjustable seats, wipers, automatic windows, and automatic footrests. These convenience features are mainly installed inside the vehicle or on the floor, and this configuration can be seen as having sensitive positioning conditions where noise generated during the operation of the convenience features can be transmitted directly to the user.

[0007] Therefore, brush-type motors applied to these convenience features require particularly excellent quality in terms of noise.

[0008] However, according to the brush-type motor, vibration occurs in the brush (5) due to contact between the commutator (4) and the brush (5) for supplying current to the winding of the rotor (3), and noise is generated as the brush (5) shakes due to the vibration and collides with the brush holder (6).

[0009] There is a problem in that the noise generated by the collision between the brush (5) and the brush holder (6) spreads outward through the PCB and housing components, causing inconvenience during use.

[0010]

[0011] The present invention is intended to provide a brush-type motor in which noise generated by contact between the commutator and the brush is reduced.

[0012]

[0013] A brush-type motor according to the present invention comprises a stator, a rotor, a brush for supplying current by contacting the rotor, and a brush holder for fixing the brush. The brush holder is formed in a pocket shape into which the brush is inserted, a guide slot is formed on the side of the brush, and a guide means is provided in the brush holder to be fitted into the guide slot of the brush.

[0014] The guide slot is formed on one side of the brush in a shape that extends along the longitudinal direction of the brush, and the guide means is provided on one side of the brush holder and consists of a guide rail that is fitted into the guide slot in a shape that protrudes inwardly into the brush holder.

[0015] The above guide rail is formed by bending one of the two leading ends, formed by dividing one side of the brush holder in the longitudinal direction, inward.

[0016] The above guide means consists of a guide wire mounted on one side of the brush hold and protruding into the brush hold.

[0017] The guide slots are formed on opposite sides of the brush in a shape that extends along the longitudinal direction of the brush, and the guide means consists of a plate spring mounted on the brush holder and fitted into the guide slots.

[0018] The above guide means consists of a torsion spring mounted in the brush holder and fitted into the guide slot.

[0019]

[0020] According to the present invention, when the brush is in contact with the commutator provided on the surface of the rotor, even if vibration occurs as the brush passes through the gap of the commutator while the rotor rotates, the shaking of the brush is suppressed by each guide means fitted into the guide slot, thereby reducing noise caused by collision between the brush and the brush holder, which helps improve the usability of the automobile.

[0021] Fig. 1: Drawing showing the structure of a typical brush-type motor

[0022] FIG. 2: A drawing showing a mounting structure of a brush according to an embodiment of the present invention.

[0023] FIG. 3a: A diagram showing the combined configuration of a brush and a brush holder in one embodiment of the present invention (with guide rail applied)

[0024] FIG. 3b: A drawing showing the state in which a brush is inserted into a brush holder in one embodiment of the present invention (with guide rail applied)

[0025] FIG. 4a: A drawing showing the state in which a brush is inserted into a brush holder in one embodiment of the present invention (guide wire applied)

[0026] FIG. 4b: A drawing showing the state in which a brush is inserted into a brush holder in one embodiment of the present invention from a different angle (guide wire applied)

[0027] FIG. 5a: A diagram showing the process of inserting a brush into a brush holder in another embodiment of the present invention (with a leaf spring applied)

[0028] FIG. 5b: A drawing showing the state in which a brush is inserted into a brush holder in another embodiment of the present invention (with a leaf spring applied)

[0029] FIG. 6a: A diagram showing the process of inserting a brush into a brush holder in another embodiment of the present invention (torsion spring applied)

[0030] FIG. 6b: A drawing showing the state in which a brush is inserted into a brush holder in another embodiment of the present invention (torsion spring applied)

[0031]

[0032]

[0033] Hereinafter, specific details for implementing the present invention will be explained in detail with reference to FIGS. 2 through 6b.

[0034] A brush-type motor according to the present invention comprises, as shown in FIG. 2, a stator (2) and a rotor (3) (see FIG. 1), a brush (10) for supplying current by contacting the rotor (3), and a brush holder (20) for fixing the brush (10).

[0035] The brush holder (20) is formed in the shape of a pocket into which the brush (10) is inserted, and a guide slot (10a) is formed on the side of the brush (10), and the brush holder (20) is provided with a guide means that fits into the guide slot (10a) of the brush (10).

[0036] A spring (7) is provided to elastically press the brush (10) inserted into the brush holder (20) outward.

[0037] The guide slot (10a) is formed in a shape that extends along the length direction of the brush (10), where the length direction refers to the direction in which the brush (10) is inserted into the guide slot (10a).

[0038] Additionally, the arrangement structure of the guide slot (10a) can be varied; for example, only one may be formed on one side of the brush (10) (see FIG. 3a, 4b), or multiple guide slots may be formed, one on each of the two opposing sides of the brush (10) (see FIG. 5a, 6a).

[0039] According to one embodiment of the present invention, as shown in FIG. 3a and 3b, a guide slot (10a) is formed on one side of the brush (10), and the guide means may be formed of a guide rail (201) that is fitted into the guide slot (10a) in a form that protrudes inward from one side of the brush holder (20) to the inside of the brush holder (20).

[0040] Here, the guide rail (201) may be formed by bending one of the leading ends of both sides, formed by dividing one side of the brush holder (20) in the longitudinal direction, inward.

[0041] According to one embodiment of the present invention, during the process of inserting the brush (10) into the brush (10) holder, the guide rail (201) is fitted into the guide slot (10a).

[0042] Accordingly, when the brush (10) is in contact with the commutator (4) provided on the surface of the rotor (3), even if left-right vibration occurs as the brush (10) passes through the gap of the commutator (4) while the rotor (3) rotates, the shaking of the brush (10) is suppressed due to the structure in which the guide rail (201) is fitted into the guide slot (10a).

[0043] Therefore, noise resulting from the collision between the brush (10) and the brush holder (20) is not generated or is significantly reduced.

[0044] As shown in FIGS. 4a and 4b, the guide means may be composed of a guide wire (22) mounted on one side of the brush holder (20) and protruding into the brush holder (20). The guide wire (22) may be fixed by soldering both ends to a PCB substrate (P) outside the brush holder (20) to increase installation stability, and may be configured so that the middle portion protrudes into the brush holder (20).

[0045] According to this, the shaking of the brush (10) is also suppressed by inserting the guide wire (22) into the guide slot (10a).

[0046]

[0047] According to another embodiment of the present invention, as shown in FIGS. 5a and 5b, the guide slot (10a) is formed on each of the opposing sides of the brush (10) in a form that extends along the longitudinal direction of the brush (10), and the guide means may be made of a plate spring (30) that is mounted on the brush holder (20) and fitted into each guide slot (10a).

[0048] The leaf spring (30) is in the form of a narrow, curved panel and is mounted such that both ends are fitted into the guide slot (10a), so that the middle part protrudes inward, and when the brush (10) is inserted into the brush holder (20), the protruding middle part of the leaf spring (30) is fitted into the guide slot (10a).

[0049] According to another embodiment of the present invention, the plate springs (30) on both sides are fitted into the guide slots (10a) of the brush (10) and elastically press the brush (10) in opposite directions, thereby strongly suppressing the shaking of the brush (10).

[0050]

[0051] According to another embodiment of the present invention, as shown in FIGS. 6a and 6b, the guide slot (10a) is formed on each of the opposing sides of the brush (10) in a form that extends along the longitudinal direction of the brush (10), and the guide means may be composed of a torsion spring (40) that is mounted on the brush holder (20) and fitted into each guide slot (10a).

[0052] The torsion spring (40) is mounted in such a way that its middle part forms a coil and both ends are fitted into the guide slot (10a), so that the middle part protrudes into the inside of the brush holder (20), and when the brush (10) is inserted into the brush holder (20), the protruding middle part of the torsion spring (40) is fitted into the guide slot (10a).

[0053] According to another embodiment of the present invention, the torsion springs (40) on both sides are fitted into the guide slot (10a) of the brush (10), thereby strongly suppressing the shaking of the brush (10).

[0054] Accordingly, according to the present invention, when the brush (10) is in contact with the commutator (4) provided on the surface of the rotor (3), even if vibration occurs as the brush (10) passes through the gap of the commutator (4) while the rotor (3) rotates, the shaking of the brush (10) is suppressed by each guide means fitted into the guide slot (10a), thereby reducing noise caused by collision between the brush (10) and the brush holder (20).

[0055]

[0056] The description of the embodiments of the present invention concludes above. The embodiments of the present invention described above should not be interpreted as limiting the technical scope of the present invention. It should be noted that various modifications can be made by those skilled in the art without departing from the essence of the present invention as claimed in the claims, and such modifications fall within the scope of the present invention.

Claims

1. A motor comprising a stator, a rotor, a brush for contacting the rotor to supply current, and a brush holder for fixing the brush, The brush holder is formed in the shape of a pocket into which the brush is inserted, and A guide slot is formed on the side of the brush, and The brush holder is provided with a guide means that fits into the guide slot of the brush. When the brush is in contact with the commutator provided on the surface of the rotor, even if vibration occurs as the brush passes through the gap of the commutator while the rotor rotates, the shaking of the brush is suppressed by the guide means fitted into the guide slot, thereby reducing noise caused by collision between the brush and the brush holder. A brush-type motor characterized by 2. In Paragraph 1, The above guide slot is formed on one side of the brush in a shape that extends along the longitudinal direction of the brush. A brush-type motor characterized by 3. In Clause 2, the guide means is A guide rail formed on one side of the brush holder and protruding inwardly into the brush holder, and fitted into the guide slot. A brush-type motor characterized by 4. In Clause 3, the guide rail is, One side of the brush holder is formed by dividing it into two parts along the longitudinal direction, and one of the two tips is bent inward. A brush-type motor characterized by 5. In Clause 2, the guide means is It consists of a guide wire mounted on one side of the brush holder and protruding inwardly into the brush holder. A brush-type motor characterized by 6. In Paragraph 1, The above guide slots are formed on opposite sides of the brush in a shape that extends along the longitudinal direction of the brush, and The above guide means is composed of a plate spring mounted on the brush holder and fitted into the guide slot. A brush-type motor characterized by 7. In claim 6, the guide means is A torsion spring mounted in the brush holder and fitted into the guide slot. A brush-type motor characterized by

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