KR200304178Y1 - Automotive AC Generators_ - Google Patents

Abstract

The present invention relates to an automotive alternator, the purpose of which is to improve the coupling structure of the slip ring fixing member fixed to a pair of slip ring and the rotary shaft end to prevent short phenomenon and to facilitate the processing of the rotary shaft.

In the automotive alternator according to the present invention, a stepped shaft 322 having a chamfer 323 symmetrically formed at an end of the rotating shaft 32 is formed to protrude in an axial direction, and a pair of slip rings 50 and 60 are provided on the outer circumferential surface thereof. A coupling hole 411 having the same shape is drilled in the axial direction so that the stepped shaft 322 having the chamfer 323 formed in the slip ring fixing member 40 is fitted. Therefore, the slip ring fixing member 40 is firmly coupled to the end of the rotating shaft 32 through the stepped shaft 322 and the coupling hole 411. When the inner circumferential surface of the coupling hole 411 is plastically deformed, the slip ring ( The space where the 50 and 60 and the lead wires 70 and 71 are wired is secured due to the formation of the chamfer 323, thereby preventing the short. Accordingly, the reliability of the overall alternator is improved, and by simply forming the chamfer 323, the processing of the rotating shaft 32 can be simplified as compared with the related art, thereby reducing the manufacturing cost thereof.

Description

Automotive Alternator

The present invention relates to an automotive alternator, and more particularly, to a fixing structure of a slip ring fixing member provided with a slip ring to be coupled to the rotary shaft end to continuously friction with the tip of the brush.

In general, vehicle alternators are used in various forms to induce voltage while rotating by the power of the engine, and among them, there are alternating current generators of the rear bracket type and the end cover type.

The end cover type alternator has electric functional parts installed on the outside of the rear bracket, and the end cover is wrapped around them. It is composed of front and rear to form an exterior body and has a pair of front and rear brackets with an exhaust port through which air is sucked and exhausted. A rotor made of a pair of polcoa is built in, and the stator is provided to surround the rotor.

The rotor is wound with field coils, and a rotating shaft penetrates the center portion in the axial direction. One end of the rotating shaft extending through the center of the front bracket to the outside is equipped with a pulley (pully) connected via the engine and the belt, and the other end of the rotating shaft extending to the outside of the rear bracket supplies current to the field coil The tip of the brush to keep in contact with.

The stator is installed in the inner circumference of the front and rear brackets so as to maintain a constant distance from the rotor, in which coils are wound so as to generate electromotive force by interacting with the rotation of the rotor.

In addition, around the other end of the rotating shaft extending outside the rear bracket, a rectifier for converting alternating current (AC) into direct current, a voltage regulator for controlling the field current flowing through the field coil and the output of the generator, and a brush holder with a brush The back cover is provided, and the end cover is coupled to surround them.

The alternator configured as described above rotates a pulley along with driving an engine to rotate a rotating shaft and a rotor. Therefore, the magnetomotive force is generated in the field coil of the rotor supplied with the field current through the brush, thereby generating the induced electromotive force, that is, the output current in the coil wound on the stator. The output current is then fed to each part of the vehicle via a rectifier and a voltage regulator that regulates the voltage.

In order to improve the output characteristics of the alternator, a constant field current must be supplied to the field coil of the rotor through a brush, which is made through a slip structure provided at the other end of the rotating shaft 1 as shown in FIG. 1. .

As shown therein, slip rings 5 and 6 are provided at the end of the rotating shaft 1 so that the tip of the brush (not shown) is continuously rubbed to supply the field current to the field coil (not shown).

To this end, a stepped shaft 2 having a reduced diameter is provided at the end of the rotating shaft 1, and a knurling portion 2a is provided on the outer circumferential surface of the tip of the stepped shaft 2 in the axial direction. And the slip ring fixing member 3, which is injection molded in plastic material, is inserted into the distal end of the stepped shaft 2 so that the F-polar slip ring 5 and the L-polar slip ring 6 are provided on the outer peripheral surface of the distal end. do. In the center of the slip ring fixing member 3, the coupling hole 4 with the inner circumferential surface knurled 4a is also drilled in the axial direction. At this time, knurling the stepped shaft 2 and the coupling hole 4 is to prevent the slip ring fixing member 3 from sliding in the rotation radius direction.

The F-polar slip ring 5 and the L-polar slip ring 6 are electrically connected to the lead wires of the field coils (not shown), respectively, through the lead wires 7 and 8, thereby forming a closed circuit. That is, the lead wires 7 and 8 are built into the slip ring fixing member 3 so that one end thereof is electrically connected to the slip rings 5 and 6, and the other end thereof is extended out to the outside and the field coil ( Not shown) is connected through the lead wire and the soldering means.

Accordingly, the first lead wire 7 connected to the F polar sling lip 5 is inserted into the slip ring fixing member 3 in the axial direction, and the second lead wire connected to the L polar slip ring 6 is inserted therein. (8) is also inserted symmetrically with the first lead wire (7). This symmetrical configuration is because the thickness of the slip ring fixing member 3 is thin.

The slip ring fixing member 3 configured as described above is inserted into the stepped shaft 2 of the rotary shaft 1, and the ends of the lead wires 7 and 8 are connected to the field coil lead wires through soldering. Therefore, the tip of the brush (not shown) is continuously frictionally contacted with the F-polar slip ring 5 and the L-polar slip ring 6 when the AC generator is driven to form a closed circuit. At this time, the slip ring fixing member 3 is fitted to the stepped shaft 2 of the rotary shaft 1 through the coupling hole 4, respectively, on the inner peripheral surface of the coupling hole 4 and the outer peripheral surface of the stepped shaft 2, respectively. The knurling process is carried out so that the slip ring fixing member 3 is firmly fixed to the stepped shaft 2 so that slippage does not occur during operation.

However, in the conventional slip ring fixing member 3, the lead wires 7 and 8 are symmetrically installed in the axial direction, and if the thickness thereof is not sufficiently secured, a short phenomenon may occur when the rotary shaft 1 is forcibly fitted. There is.

That is, the first lead wire line 7 installed in the slip ring fixing member 3 is connected to the L-polar slip ring to connect the F-polar slip ring 5 located at the outer side and the field coil lead wire. (6) It extends in the axial direction past the lower part. At this time, the first lead wire 7 must be electrically insulated from the L polar slip ring 6 and the rotating shaft 1 while passing between the L polar slip ring 6 and the inner circumferential surface of the slip ring fixing member 3.

However, the conventional alternator cannot sufficiently secure the thickness, i.e., the radial thickness "G", between the cylindrical inner surface of the L-polar slip ring 6 and the inner circumferential surface of the coupling hole 4 of the slip ring fixing member 3. That is, the gap “G1” between the L-polar slip ring 6 and the first lead wire 7 is not sufficiently secured, and the first lead wire 7 may be caused by the injection pressure during injection molding of the slip ring fixing member 3. Is shortened to the L-polar slip ring (6). In addition, the gap “G2” between the inner surfaces of the slip ring fixing member 1 constituting the first lead wire 7 and the coupling hole 4 is not sufficiently secured, thereby causing the slip ring fixing member 3 to rotate. The inner circumferential surface of the coupling hole 4 is plastically deformed by the tip of the stepped shaft 2 of the rotation shaft 1 formed larger than the inner diameter of the coupling hole 4 when press-fitted into the first hole 7, and the rotation shaft 1 is shorted. By doing so, there is a problem that product reliability is inferior.

In addition, the step circumference 2 of the rotary shaft 1 to which the slip ring fixing member 3 is coupled is required to add a knurling process 2a to the outer circumferential surface through a separate tool, thereby increasing the number of working hours and increasing the processing time. There is a costly problem.

The present invention is to solve this problem, the object of the present invention is to provide a stepped shaft formed in the chamfered portion at the end of the rotating shaft in the axial direction and the coupling hole having the same shape such that the stepped shaft is fitted to the slip ring fixing member. By providing a chamfered portion, the wiring space of the lead wire is sufficiently secured to improve overall product reliability and to facilitate the processing to provide a vehicle alternator that reduces manufacturing costs.

1 is an exploded cross-sectional view showing a coupling structure of a conventional slip ring fixing member and a rotating shaft.

Figure 2 is a cross-sectional view showing the overall structure of the vehicle alternator according to the present invention.

Figure 3 is a cross-sectional view taken to extract the coupling structure of the slip ring fixing member and the rotary shaft end according to the present invention.

Figure 4 is a perspective view of the slip ring fixing member coupled to the rotary shaft end in accordance with the present invention.

* Description of the symbols for the main parts of the drawings *

30. Rotor 32. Rotating shaft 321. Seating groove

322. Stepped shaft 323. First chamfer 40. Slip ring fixing member

41..Gojeong 411..Joining hole 412..2nd chamfer

42.Bridge part 43.Flange part 50,60.Slip ring

70,71.Leadwire

The present invention for achieving this purpose, the front bracket and the rear bracket forming the appearance, the inside of the front and rear brackets are rotatably installed and the rotor coil wound around the coil, the vehicle is pressed in the axial direction in the center of the rotor The rod-shaped fixing part is installed at the end of the rotating shaft to rotate the rotor by the engine driving and the F-polar slip ring, L-polar slip ring, and F, L-polar slip ring, respectively, on which the brush tip is rubbed. Slip ring fixing member, stepped shaft formed in the axial direction so as to be reduced in diameter at the end of the rotary shaft to be coupled to the center of the fixing portion of the slip ring fixing member, stepped shaft is forcibly fitted in the axial direction to secure the slip ring fixing member When the slip ring fixing member is coupled through the formed coupling hole, the coupling hole and the stepped shaft, the slip phenomenon in the direction of rotation of the rotating shaft is prevented. In the vehicle AC generator with a rib preventing member,

The slip preventing member has a flat surface on the inner circumferential surface of the coupling hole to prevent the slip ring fixing member from sliding in the rotational direction by preventing the slip ring fixing member from slipping in the rotational direction by the first chamfer provided in the longitudinal direction symmetrically on the outer circumferential surface of the stepped shaft. It characterized in that it comprises a second chamfer formed symmetrically.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. 2 is a cross-sectional view showing the overall structure of the vehicle alternator according to the present invention. Figure 3 is an enlarged cross-sectional view showing a coupling structure of the slip ring fixing member and the rotating shaft according to the present invention, Figure 4 is an exploded perspective view of the slip ring fixing member and the rotating shaft according to the present invention.

Alternator for a vehicle according to the present invention, as shown in these, the stator 20 and the rotor 30 are installed in the front bracket 10 and the rear bracket 11 formed with an exhaust body and formed with exhaust ports, Electrical components are attached to the outside of the bracket 11. The front bracket 10 and the rear bracket 11 are installed to face each other and are bound by bolts to surround the stator 20 and the rotor 30.

The rotor 30 is composed of a pair of pole cores 31 in which the field coil 33 is wound, and the rotation shaft 32 is pressed in the axial direction at the center thereof. Both ends of the rotating shaft 32 are supported by the bearing to facilitate the rotational movement. For this purpose, a front bearing 35 supporting one end of the rotating shaft 32 is provided at the center of the front bracket 10 and the rear bracket ( The rear bearing 36 which supports the other end of the rotating shaft 32 is comprised in the center of 11). And one end of the rotating shaft 32 extending to the outside of the front bracket 10 is provided with a pulley (PULLY, 34), it is connected to the engine drive shaft (not shown) via a belt (not shown).

The stator 20 is firmly fixed to the inner circumferences of the front and rear brackets 10 and 11 so as to maintain a constant distance from the rotor 30, and generates an induced electromotive force by interacting with the magnetic force generated from the rotor 30. The coil to make is wound.

In addition, a pair of slip rings 50 and 60 are provided at the other end of the rotating shaft 32 extending outside the rear bracket 11 so that the tip of the brush 80 is always slip frictiond. A rectifier 91 for converting phosphorous alternating current into a direct current, a brush holder 81 with a built-in brush 80, and a voltage for controlling the field current supplied to the field coil 33 and the output voltage of the generator through the brush 80. The adjusting device 90 and the like are provided and wrapped by the end cover 13.

On the other hand, in the field coil 33 wound on the rotor 30, the field current is input through the pair of slip rings 50 and 60 and the lead wires 70 and 71 in which the brush 80 frictionally moves. The detailed structure thereof is as follows.

First, a mounting groove 321 having a predetermined depth on the outer circumferential surface is machined in the longitudinal direction at the other end of the rotating shaft 32 extending outwardly of the rear bracket 11, and the diameter is reduced and the end is protruded in the axial direction. An axle 322 is configured. The seating groove 321 is formed to correspond to 180 degrees and is a portion in which the bridge portion 42 to be described later is seated, and the stepped shaft is fitted into the coupling hole 411 to be described later to fix the slip ring fixing member 40.

And the other end of the rotary shaft 32 is fixed to the F-polar slip ring 50 and L-polar slip ring 60, which is made through the slip ring fixing member 40 injection molded of plastic material. The slip ring fixing member 40 includes a flange portion 43 through which the other end portion of the fixing portion 41 and the rotating shaft 32 made of a rod shape are connected, and a bridge portion connecting the fixing portion 41 and the flange portion 43. It consists of 42.

The fixing portion 41 is inserted into the outer polar circumferential surface of the F-polar slip ring 50 (INSERT) and the L-polar slip ring 60 is also inserted and fixed to be spaced apart from the predetermined interval, the coupling hole in the axial direction in the center thereof ( 411 is punched through the stepped shaft 322 is fitted and coupled thereto. First and second lead wires 70 and 71 for electrically connecting the F and L polar slip rings 50 and 60 to the field coil are symmetrically wired inside the body of the fixing part 41. That is, when the slip ring fixing member 40 is formed by inserting the ends of the first and second lead wires 70 and 71 to the F polar slip ring 50 and the L polar slip ring 60, respectively, Fix it. The bridge portion 42 is formed to be symmetrically shaped in a square shape to connect the fixing portion 41 and the flange portion 43, and the first lead wire 70 and the second lead wire 71 are wired therein, respectively. .

And the flange portion 43 formed in the outward flange shape is coupled to the other end of the rotary shaft 32 as described above. To this end, a circular through hole 431 is formed at the center thereof, and the other ends of the first and second lead wires 70 and 71 are drawn outward and connected to the field coil 33 lead wire through soldering means. Each slip ring 50 and 60 and the field coil 33 are connected to form a closed circuit.

On the other hand, in the process of coupling the slip ring fixing member 40 to the end of the rotary shaft 32, as well as the short phenomenon of the first and second lead wires (70, 71), as well as the slip prevention member for preventing the slip phenomenon is There is provided, the detailed structure thereof is as follows.

First, a first chamfer 323 having a flat surface is machined on the outer circumferential surface of the stepped shaft 322 extending in the axial direction from the other end of the rotary shaft 32. At this time, the diameter of the stepped shaft 322 is made slightly larger than the inner diameter of the coupling hole 411, the first chamfer 323 is formed symmetrically 180 degrees in the longitudinal direction.

In addition, a second chamfer 412 having a planar shape is also formed in the coupling hole 411 of the fixing part 41 to which the stepped shaft 322 is fitted and coupled when the slip ring fixing member 40 is coupled. The second chamfer 412 is provided in the longitudinal direction at the inner circumferential surface of the coupling hole 411 and is integrally formed when the slip ring fixing member 40 is molded. Accordingly, the first step chamfer 323 and the second chamfer 412 are in surface contact with the slip ring fixing member 40 when the stepped shaft 322 processed on the rotating shaft 32 is fitted into the coupling hole 411. Is prevented from slipping in the rotational direction, it is preferable that the second chamfering portion 412 is molded in a portion where the first lead wire 70 and the second lead wire 71 are wired. That is, the gap between the inner circumferential surface of the coupling hole 411 and the slip rings 50 and 60 is sufficiently secured due to the formation of the second chamfer 412, and the first lead wire (outside the second chamfer 412) is formed. When the 70 and the second lead wires 71 are embedded, even if the inner circumferential surface of the coupling hole 411 is slightly plastically deformed, the slip rings 50 and 60 and the lead wires 70 and 71 are not affected.

Therefore, when the other end of the rotary shaft 32 is inserted through the through hole 431 and the stepped shaft 322 is forcibly fitted into the coupling hole 411, the bridge portion 42 provided to face the mounting groove 321 is provided. It is seated, the first chamfering portion 323 and the second chamfering portion 412 are each in surface contact with the slip ring fixing member 40 is firmly fixed to the end of the rotary shaft (32).

The slip ring fixing member 40 is buried in the axial direction while the first lead wire 70 connected to the F polar slip ring 50 passes through the lower portion of the L polar slip ring 60. 40 when the second chamfered portion 412 is formed to ensure sufficient thickness so that the stepped shaft 322 does not affect the installation position of the L-polar slip ring 60, the first lead wire 70 Buried is possible to maintain a sufficient gap with the L-polar slip ring (60).

Accordingly, even when a part of the inner circumferential surface of the coupling hole 411 is plastically deformed in the process of forcibly coupling the stepped shaft 322 to the coupling hole 411, the L-polar slip ring 60, the first lead wire 70, and the rotation shaft 32 are formed. Is electrically insulated, and the second lead wire 71 also maintains a sufficient distance from the outer circumferential surface of the rotating shaft 32 so that a short phenomenon does not occur.

Next will be described the operation and effect of the vehicle alternator according to the present invention configured as described above.

First, when the vehicle engine is started, the rotating shaft 32 and the rotor 30 are rotated at high speed together with the pulley 34 connected through a belt (not shown), and at the same time, the brush (at the other end of the rotating shaft 32) The tip portion of 80 is continuously rubbed against the outer circumferential surfaces of the slip rings 50 and 60. Accordingly, an excitation current is generated by supplying an excitation current to the field coil 33 of the rotor 30 through the voltage adjusting device 90, and induced electromotive force is generated in the coil wound around the stator 20. This output current is converted into a direct current through the rectifier 91, and the voltage applied from the rectifier 91 is supplied to each electric device of the vehicle while being maintained at a prescribed value by the voltage adjusting device 90.

In the alternator having such a function, the slip rings 50 and 60 and the lead wires 70 and 71 for electrically connecting the brush 80 and the field coil 33 lead wires are shorted through the slip ring fixing member 40. Since it is installed to prevent generation, the excitation current is easily applied to the field coil 33 of the rotor 30, so that this function can be performed smoothly.

That is, the slip ring fixing member 40 does not slip on the other end of the rotation shaft 32 by using the stepped shaft 322 having the first chamfer 323 and the coupling hole 411 having the second chamfer 412. The first lead wire 70 connected to the F-polar slip ring 50 is buried so as to maintain a sufficient distance from the L-polar slip ring 60, thereby influencing the assembly of the slip ring fixing member 40. Do not receive.

Therefore, the gap G1 ′ between the L-polar slip ring 60 and the first lead wire 70 is sufficiently secured, so that the first lead wire 70 is somewhat affected by the injection pressure during injection molding of the slip ring fixing member 40. Even if it is separated, the short phenomenon with the L-polar slip ring 60 does not occur, and mechanical and electrical interference between the first and second lead wires 70 and 71 and the rotating shaft 32 is prevented at the source. In addition, when the slip ring fixing member 40 is press-fitted to the other end of the rotary shaft 32, the coupling hole 411 is fired by the stepped shaft 322 of the rotary shaft 32 formed larger than the inner diameter of the coupling hole 411. Even if deformed, the first and second lead wires 70 and 71 and the rotation shaft 32 are not shorted.

As a result, a space for embedding the first and second lead wires 70 and 71 is formed larger than the conventional one due to the formation of the second chamfer 412 on the inner circumferential surface of the coupling hole 411. ) And the L polar slip ring 50 and the rotation shaft 32, and the electrical insulation between the rotation shaft 32 and the second lead wire 71 are maintained as they are, so that the plastic ring may be deformed when the slip ring fixing member 40 is fitted. Since these short phenomenon does not occur, the overall product reliability is improved.

In addition, after the step shaft 322 is processed to reduce the diameter at the other end of the rotating shaft 32, the first chamfering portion 323 is additionally processed on its outer circumferential surface, thereby firmly coupling the slip ring fixing member 40 to it. It is possible to process the rotating shaft 32 is easy, thereby reducing the manufacturing cost.

As described in detail above, the vehicle AC generator according to the present invention is formed so that the stepped shaft formed symmetrically in the chamfered portion at the end of the rotation shaft, the chamfered portion in the slip ring fixing member provided on the outer circumferential surface of the pair of slip rings A coupling hole having the same shape is drilled in the axial direction so that the formed stepped shaft is fitted. Therefore, the slip ring fixing member is firmly coupled to the end of the rotating shaft through the stepped shaft and the coupling hole. Even when the inner circumferential surface of the coupling hole is plastically deformed, the space in which the slip ring and the lead wire are wired is secured due to the chamfer formation. Its short circuit is prevented. As a result, the reliability of the overall alternator is improved, and by simply forming the chamfer, it is possible to simplify the rotating shaft processing as compared to the conventional art, and thus the manufacturing cost thereof is reduced.

Claims (1)

The front bracket (10) and the rear bracket (11) forming the exterior, the front and rear brackets (11, 12) are installed rotatably inside the rotor (30) coiled field coil (33), the rotor F, which is axially pressed into the center of the shaft 30 and is installed at the end of the rotary shaft 32 to rotate the rotor 30 by the vehicle engine drive, the end of the rotary shaft 32, F friction each of the tip of the brush (80) Slip ring fixing member provided with a rod-shaped fixing portion 41 in which the polar slip ring 50 and the L polar slip ring 60 and the F and L polar slip rings 50 and 60 are fixed to the outer circumferential surface of the distal end portion. Stepped shaft 322 protruding in the axial direction to reduce the diameter at the end of the rotary shaft 32 to be fitted and coupled to the center of the fixing portion 41 of the government member 40, the stepped shaft 322 is forcibly fitted Coupling hole 411 formed in the axial direction in the fixing portion 41 so that the slip ring fixing member 40 is fixed, the coupling In the automotive alternator having a slip preventing member that prevents slip in the rotational direction of the rotating shaft 32 when the slip ring fixing member 40 is coupled through the hole 411 and the stepped shaft 322. The slip preventing member may include a first chamfer 323 and a first chamfer 323 which are provided symmetrically in a longitudinal direction on an outer circumferential surface of the stepped shaft 322 to be in surface contact with the coupling hole 411. Vehicle slip generator comprising a second chamfer 412 symmetrically planar on the inner peripheral surface of the coupling hole (411) to prevent the slip ring fixing member (40) to slide in the rotational direction.