KR20170079659A

KR20170079659A - Alternator for Vehicle

Info

Publication number: KR20170079659A
Application number: KR1020150190458A
Authority: KR
Inventors: 김병길; 이우성; 진진
Original assignee: 이래오토모티브시스템 주식회사
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2017-07-10

Abstract

The present invention relates to a vehicle alternator, and more particularly, to a vehicle alternator in which a slip ring of a disc and a ring is applied in place of a rotor slip ring arranged axially on the outer periphery of a conventional rotor end .
According to an embodiment of the present invention, there is provided a vehicular alternator that uniformly adjusts an induced voltage in association with a commutator, the automotive alternator including: a first slip ring disposed on a plane perpendicular to a rotation axis of the rotor at one end of the rotor, A second slip ring disposed at an end of the rotor at an outer side of the first slip ring and formed in a ring shape so as to have a concentric circle with the first slip ring; A slip ring assembly including an insulating portion disposed between the first slip ring and the second slip ring so as to be spaced apart from the slip ring assembly; A regulator provided for adjusting a voltage; And a brush provided to interconnect the slip ring assembly and the regulator.

Description

[0001] Alternator for Vehicle [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automotive alternator, and more particularly, to a vehicle alternator in which a slip ring having a disk and a ring shape is applied instead of a rotor slip ring arranged axially on the outer periphery of a conventional cylindrical rotor end Invention.

2. Description of the Related Art In general, a vehicle is equipped with various electric and electronic devices that are operated by electric power supplied from a generator and a battery, and a charging device is provided with a generator as a center for stable supply of electric power to be supplied to the electric and electronic devices. Although a direct current generator and an alternator are used as generators, an alternator that maintains stability at low speed and high speed is widely used.

As the automotive alternator, a three-phase alternator generally called an alternator is used in order to increase the generated voltage at low speed and to exhibit stable performance at high speed. The three-phase alternator is connected to the crankshaft of an automobile engine, receives power during engine rotation, performs power generation, and charges the battery.

1 is a cross-sectional view schematically showing a general automotive alternator.

As shown in FIG. 1, the automotive alternator includes a rotor assembly 110 rotatably disposed in the center of the housing 100 to generate a magnetomotive force, A stator assembly 130 for generating an induced electromotive force by a generated magnetostriction and disposed around the inner circumferential surface of the housing 100 to surround the rotor assembly 110, A regulator 140 for regulating the intensity of the magnetic field, a rectifier 150 for rectifying the generated alternating current to a direct current, and a motor for receiving power from the engine. The rectifier 140 is connected to the crankshaft of the engine through a belt A pulley 160 and the like.

Specifically, the rotor assembly is formed into a cylindrical shape, and comprises two claw poles and a field winding (coil) interposed therebetween. The rotor assembly generates the rotating magnetic field needed to move the alternator. The stator assembly is formed of a plurality of windings surrounding the rotor or a plurality of iron plates laminated with a thin steel plate to induce an alternating current. The relative speed of the rotor and the stator is generated by rotating in synchronism with the rotating magnetic field. The rectifier assembly includes a rectifier diode or a MOSFET to rectify the three-phase alternating current to direct current.

The regulator cooperates with the rectifier assembly to serve as a voltage regulator that uniformly adjusts the generator voltage irrespective of the load and rotational speed of the generator. The main purpose of the voltage adjustment is to prevent malfunction of the electric device due to voltage pulsation and to protect various electric parts from overload. The regulator is housed in the generator housing and is compactly assembled. Depending on the mounting type, the brush holder may be integrated with or connected to the brush holder.

2 is a view showing the internal structure of the brush assembly 120 according to the related art.

Specifically, the brush 123 of the prior art is located inside the brush holder 121 and has a stick shape and one end thereof is always kept in contact with the slip-ring 220 of the rotor assembly, The other end of the brush 123 is connected to a support member for supporting the brush 123 and an inner spring 124 for providing a resilient force toward the rotor assembly, .

2, the brush 123 is installed to be able to move forward and backward in parallel with the longitudinal direction of the brush holder 121, and is guided by the inner wall of the brush holder 121 and is orthogonal to the axial direction of the rotor rotation shaft 210. [ .

Since the brush 123 always contacts and circulates with the rotor slip ring rotating at a high speed, a considerable friction is generated on the surface of the brush 123. A brush 123 having a considerable length to withstand such a large frictional force, do.

During the operation of the alternator, wear between the slip ring and the brush will be worn more frequently in either brush due to the temperature difference. 1 and 2 together, the rotor fan and the brush on the far side are disadvantageous to the air circulation due to the cover on the back side and the brush near the rotor fan is advantageous for air circulation. However, according to the related art, there is no proper method for compensating the abrasion phenomenon due to a temperature difference, as well as forming the rotor and the brushes orthogonal to each other. In addition, a brush having a sufficiently long length is provided and then pressed by a spring Method, and the brush is worn down by a certain length, and the whole brush assembly is replaced.

In addition, the brush 123, which is naturally generated by abrasion of the brush 123 during operation of the alternator, penetrates deeply toward the inner wall of the brush holder 121, causing a brush jam phenomenon. Such a conventional construction necessarily requires frequent cleaning of the brush assembly, which adversely affects the service life of the parts. If the degree is too great, the brush can not be operated, and the current can not be transmitted from the brush to the rotor assembly, which can be a fatal factor that hinders the generation of the alternator.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the drawbacks of the prior art in order to enhance the abrasion resistance of brushes by ultimately changing the shape of the rotor slip ring and the shape of the brush assembly.

According to an embodiment of the present invention, there is provided a vehicular alternator that uniformly adjusts an induced voltage in association with a commutator, the automotive alternator including: a first slip ring disposed on a plane perpendicular to a rotation axis of the rotor at one end of the rotor, A second slip ring disposed at an end of the rotor at an outer side of the first slip ring and formed in a ring shape so as to have a concentric circle with the first slip ring; A slip ring assembly including an insulating portion disposed between the first slip ring and the second slip ring so as to be spaced apart from the slip ring assembly; A regulator provided for adjusting a voltage; And a brush provided to interconnect the slip ring assembly and the regulator.

According to an embodiment of the present invention, the brush includes a first brush contacting the first slip ring and a second brush contacting the second slip ring. The first brush and the second brush are connected to the rotation axis of the rotor, And extend in parallel directions to contact the first slip ring and the second slip ring.

According to an embodiment, the first brush may be formed to have a shorter length than the second brush.

According to one embodiment, the regulator includes a lower plate of a regulator adjacent to the inner housing of the alternator and an upper plate located on the opposite side of the lower plate, and a circuit element for voltage adjustment may be fixedly installed on the inner wall of the upper plate .

According to an embodiment, the regulator may include a plurality of radiating fins protruded to dissipate heat generated from the circuit elements to the outside.

Here, the radiating fin may be disposed on the upper plate or the lower plate.

The AC generator according to an embodiment of the present invention may be configured such that the shape of the slip ring is changed to a disk having a concentric circle and a slip ring having a ring shape instead of the slip ring arranged axially parallel to the outer periphery of a conventional rotor end, And ultimately, the durability of the rotor and the brush assembly is improved.

In addition, in the present invention, the two rotor brushes are constructed so that the temperature difference between them is not large, and the effect of compensating the difference in wear performance, which has occurred in the prior art, from the structural aspect can be obtained.

Further, by improving the wear performance, it is possible to reduce the length of the extension of the brush, thereby making it possible to reduce the size of the brush assembly.

Furthermore, the conventional brush can be disposed in parallel with the rotor axis direction, which is different from the conventional brushes arranged in the direction perpendicular to the rotor axis direction, thereby providing an advantage of securing a free space inside the AC generator housing.

1 is a sectional view schematically showing a general automotive alternator;
2 is a view showing an internal configuration of a brush assembly according to the prior art;
Figure 3 schematically illustrates the construction of a brush assembly and a rotor assembly in accordance with the prior art;
4 is a conceptual view of a rotor assembly according to an embodiment of the present invention;
FIG. 5 is a schematic view illustrating the configuration of a regulator, a brush assembly, and a rotor assembly according to an embodiment of the present invention. FIG.
6 is a front view of a regulator, brush assembly according to an embodiment of the present invention;
7 is a cross-sectional view schematically showing a vehicle alternator according to an embodiment of the present invention.
FIG. 8 is an enlarged cross-sectional view enlarging a configuration of a rotor assembly and a brush assembly of a vehicular alternator according to an embodiment of the present invention; FIG.
9 is a cross-sectional view schematically showing a vehicle alternator according to another embodiment of the present invention.

Hereinafter, a vehicle AC generator according to the present invention will be described in detail with reference to the accompanying drawings.

The embodiments described below are provided so that those skilled in the art can easily understand the technical idea of the present invention, and thus the present invention is not limited thereto. In addition, the matters described in the attached drawings may be different from those actually implemented by the schematic drawings to easily describe the embodiments of the present invention.

It is to be understood that when an element is referred to as being connected or connected to another element, it may be directly connected or connected to the other element, but it is to be understood that there may be other elements in between.

The term "connection" as used herein includes both direct and indirect connections of one member and another member, and includes all physical connections and electrical connections such as bonding, attachment, fastening, bonding, and coupling.

Also, the expressions such as 'first, second', etc. are used only to distinguish a plurality of configurations, and do not limit the order or other features between configurations.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The word "comprise" or "having" is used herein to mean that a feature, a number, a step, an operation, an element, an accessory, or a combination thereof is included in the description, Steps, operations, elements, accessories, or combinations thereof, may be added.

First, a rotor assembly (rotor assembly) will be described with reference to FIGS. 3 to 4 for better understanding of the present invention.

3 is a conceptual diagram of a brush and a rotor assembly according to the prior art. 4 is a conceptual view of a rotor assembly according to an embodiment of the present invention.

3 and 4, the rotor assemblies 120 and 200 include a rotary shaft 210, a bobbin 230 which is parallel to the rotary shaft 210 and in which the field coil 200 is wound, And a pair of wing plates protruding radially from both ends of the wing plate 230. A pair of rotor magnetic pole pieces 250 coupled to both sides of the rotating shaft 210 so as to surround the bobbin 230 and having a plurality of flaws extending axially toward each other, And a pair of rotor fans 260 installed on both sides of the rotating shaft 210 so as to be adjacent to the rotor 250. Here, the wings of the wing plate and the claws of the magnetic pole pieces 250 are provided in the same number, so that the claws provided on the magnetic pole pieces 250 during assembly are disposed one-to-one with the wings provided on the wing plate The field coil 230 and the magnetic pole piece 250 are electrically insulated from each other by a spool formed of an insulating material. One end of the field coil is wound around the spool and connected to the lead coil 270. The leading end of the lead coil 270 is connected to the rotor slip rings 220 and 300 to be energized. This overall configuration can be borrowed in one embodiment of the present invention.

The conventional brush 123 shown in FIG. 3 is formed so as to face the slip rings 220 and 330 in the lateral direction of one end of the rotor and is generally orthogonal to the slip rings 220 and 330, Ring assembly 300 and the following brush configuration.

Hereinafter, a vehicle alternator according to an embodiment of the present invention will be described with reference to FIG. 4 and FIGS. 5 to 8. FIG.

FIG. 5 is a schematic view illustrating a configuration of a regulator, a brush assembly, and a rotor assembly according to an embodiment of the present invention. Referring to FIG. 6 is a front view illustrating a regulator and a brush assembly according to an embodiment of the present invention. 7 is a cross-sectional view schematically showing a vehicle alternator according to an embodiment of the present invention. 8 is an enlarged cross-sectional view of an enlarged configuration of a rotor assembly and a brush assembly of an automotive alternator according to an embodiment of the present invention.

4 and 5, the automotive alternator according to an embodiment of the present invention is a vehicle alternator that uniformly adjusts an induced voltage in association with a commutator, The first slip ring 310 and the second slip ring 310 are located on the same plane and are formed in a disc shape. The first slip ring 310 and the second slip ring 310 are located on the outer side of the first slip ring 320, A second slip ring 320 formed between the first slip ring 310 and the second slip ring 320 so as to insulate the first slip ring 310 from the second slip ring 320, A slip ring assembly 300 including an insulating portion 330 disposed on the slip ring assembly 300; A regulator 140 provided for adjusting the voltage; And brushes 420 and 430 provided to interconnect the slip ring assembly 300 and the regulator 140. [

The brush includes a first brush 420 contacting the first slip ring 310 and a second brush 430 contacting the second slip ring 320. The first brush 420 and the second brush 420 contact the first slip ring 310 and the second slip ring 320, 2 brushes 430 may extend in a direction parallel to the rotation axis 210 of the rotor and may be formed to contact the first slip ring 310 and the second slip ring 320, respectively. That is, unlike the prior art, the brush and the slip ring assembly are not arranged in a generally orthogonal shape but are arranged in a side-by-side direction. It is preferable that the center axis of the first brush 420 coincides with the center of the disc of the first slip ring 310.

5 and 8, the brush assembly 400 and the regulator 140 will be described in more detail. The brush assembly 400 includes a brush housing 410 adjacent to the regulator 140, and a brush (not shown) 420 and 430 may be connected to the circuit elements 421 and 431 located on the substrate 440 while the other end thereof is in contact with the slip ring assembly 300 while partially inserting the brush housing 410 into the brush housing 410. Springs 422 and 432 may be positioned between the brushes 420 and 430 and the circuit elements 421 and 431 to provide a force such that the brushes 420 and 430 may contact the surface of the slip ring 300 . The regulator 140 may include a circuit element 144 for voltage regulation within the regulator housing 141 which is connected to the substrate 143 by a wire 145 to provide an external configuration of the regulator 140 It can be energized. Here, the substrates 143 and 440 may be a conventional PCB substrate or a conductive lead frame, and may be electrically connected to each other within the regulator 140 and the brush assembly 400.

As described above, the wear between the slip ring and the brush is worn away more quickly in the brush far from the rotor fan. In the brush according to the prior art, a proper method for compensating for the wear due to the temperature difference A brush having a sufficiently long length is provided and the brush is pressed by a spring located at the rear. When the brush is worn down by a certain length, the entire brush assembly is replaced.

The first slip ring 310 is formed in a circular plate shape concentric with the center of the rotary shaft. The second slip ring 320 is concentrically formed with the rotary shaft and the first slip ring 310, And has an inner diameter larger than the radius of the ring 310. [ The circumferential movement distance of the first slip ring 310 per one rotation cycle is very small as compared with the circumferential movement distance per one rotation cycle of the second slip ring 320. Therefore, the friction energy of the first brush 420 contacting the first slip ring 310 becomes smaller than the friction energy of the second brush 430 contacting the second slip ring 320.

As described above, the alternator of the present invention is configured such that the slip rings 310 and 320 have different shapes from those of the prior art, and the direction of the brushes 420 and 430, which contact the slip rings 310 and 320, do. The first brush 420 contacting the first slip ring 310 may be positioned farther away from the rotor fan 260 than the second brush and may be somewhat higher in temperature than the second brush 430, The friction between the brushes 420 and 430 is compensated for in terms of frictional force. Compared with the conventional brush assembly, the brush assembly 400 of the present invention can use the brushes 420 and 430 having a shorter length, thereby reducing the manufacturing cost. The length of the first brush 420 that rubs against the first slip ring 310 may be made shorter than the length of the second brush 430 that rubs against the second slip ring 320, But they may be formed to have different lengths.

Referring to FIG. 6 and FIG. 7 together, the brush assembly 400 of the present invention may be greatly deformed in shape of the brush housing, which is the largest difference apparent from the conventional brush assembly. The brush housing which is formed so as to have the longitudinal direction on the same plane as the imaginary plane in which the housing of the conventional regulator 140 is disposed has the longitudinal direction in the direction orthogonal to the virtual plane in which the housing of the regulator 140 is disposed, The space on the plane where the contrast regulator 140 housing is disposed can be saved. As a result, the size of the alternator itself can be further reduced to make it compact.

According to an embodiment of the present invention, the regulator 140 includes a lower plate adjacent to and facing the inner housing 101 of the alternator, and an upper plate located on the opposite side of the lower plate, And the circuit element 144 included in the regulator 140 may be fixedly disposed on the inner wall of the upper plate. In general, the conventional regulator arranges the circuit elements close to the rotor fan 260 so that the cooling effect of the rotor fan 260 can be obtained. However, in the present invention, as shown in FIGS. 7 and 9, a circuit element is positioned on the upper plate side of the regulator 140 and a plurality of radiating fins 142 are protruded on the outer side of the regulator 140, A sufficient heat dissipation effect can be exhibited by directing heat generated in the heat sink 144 to the heat dissipation fins 142 directly.

In addition, the radiating fin of the present invention may be installed on the upper plate side, but may be installed on the lower plate side for efficient space utilization.

In the alternator of the present invention as described above, the shape of the slip ring is changed to a disk having a concentric circle and a slip ring having a ring shape instead of the slip ring arranged axially parallel to the outer periphery of a conventional rotor end, And ultimately, the effect of improving the durability of the rotor and the brush assembly is exerted.

In addition, in the present invention, the two rotor brushes are constructed so that the temperature difference therebetween is not large, and the effect of compensating for the difference in wear performance, which has occurred in the prior art, can be obtained. In addition, it is also possible to compensate the fine temperature difference between the brushes in terms of arrangement and shape of the brushes unique to the present invention.

The present specification is not intended to limit the present invention by the specific terms given. While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Modifications, alterations, and modifications can be made.

The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and equivalents thereof are deemed to be included in the scope of the present invention. .

100: AC generator housing
101: AC generator inner housing
110, 200: Rotor assembly
120: Brush assembly
121: Brush holder
122: Brush head part
123: Brushes
124: spring
130: stator assembly
140: Regulator
150: rectifier
160: pulley
210:
220, 300: Rotor slip ring
230: Bobbin
240: Field coil
250: rotor excitation piece
260: Rotor fan
270: lead coil
280: Bearings
310: first slip ring
320: second slip ring
330:

Claims

An automotive alternator (1) for uniformly adjusting an induced voltage in association with a commutator,
A first slip ring located on a plane perpendicular to the rotation axis of the rotor at one end of the rotor and formed in a disk shape; a second slip ring located at an end of the rotor on the outer side of the first slip ring, A slip ring assembly including a first slip ring and a second slip ring disposed between the first slip ring and the second slip ring so as to insulate the first slip ring and the second slip ring;
A regulator provided for adjusting a voltage; And
And a brush provided to interconnect the slip ring assembly and the regulator.

The method according to claim 1,
Wherein the brush comprises:
A first brush in contact with the first slip ring and a second brush in contact with the second slip ring,
Wherein the first brush and the second brush each extend in a direction parallel to a rotation axis of the rotor to contact the first slip ring and the second slip ring.

The method according to claim 1,
Wherein the first brush is formed to have a shorter length than the second brush.

The method according to claim 1,
The regulator
A lower plate of the regulator adjacent to the inner housing of the alternator and an upper plate located on the opposite side of the lower plate,
And a circuit element for voltage adjustment is fixedly installed on an inner wall of the upper plate.

5. The method of claim 4,
Wherein the regulator includes a plurality of radiating fins protruded to dissipate heat generated from the circuit elements to the outside.

6. The method of claim 5,
And the radiating fins are disposed on the upper plate or the lower plate.