KR20000016743U - Alternator for car - Google Patents

Abstract

The present invention relates to an automotive alternator, the object of which is to improve the pulley coupled to the rotary shaft end to reduce the manufacturing cost and facilitate its assembly work.

In the vehicle alternator according to the present invention, a front bearing 35 supporting the end of the rotation shaft 32 is seated on the center of the front bracket 10 in which the through hole 102 is formed, and passes through the through hole 102 to the outside. A pulley 34 is coupled to an end of the extended rotation shaft 32, and a socket-shaped coupling portion 341 having a female threaded line 342 is integrally formed on the center of the pulley 34.

Therefore, by additionally coupling the pulley 34 to the front end of the rotary shaft 32 through the coupling portion 341 without the need for a separate nut, the manufacturing cost is reduced due to the reduction of the number of parts, there is an advantage that the assembly process is simplified.

Description

Alternator for Cars

The present invention relates to an automotive alternator, and more particularly, to a fixing structure of a pulley that rotates integrally with the rotary shaft by receiving the engine power via a belt at the tip of the rotary shaft.

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 an electric functional part installed outside the rear bracket and the end cover surrounds it. It is composed of front and rear to form an exterior body and has a pair of front and rear brackets having an exhaust port through which air is sucked and exhausted. There is a rotor made of a pair of polcoa inside, 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 front bracket center to the outside is equipped with a pulley connected through the engine and the belt, and the other end of the rotating shaft extending outside 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 bracket and the rear bracket so as to maintain a constant distance from the rotor, in which coils are wound so as to generate an 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, which is an electrical component of the generator, into a 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.

In the alternator configured as described above, the pulley is rotated together with the engine driving so that the rotating shaft and the rotor are integrally interlocked, so that a magnetic force is formed in the rotor field coil supplied with the field current through the brush. Induced electromotive force, or output current, is supplied to each part of the vehicle via the generated rectifier.

Therefore, the alternator receives the engine power through the pulley coupled to the end of the rotating shaft through the nut, and the output current is generated by the rotor rotating at high speed. The coupling structure of the pulley is shown in FIG. 1.

As shown therein, the rotating shaft 2 is rotatably supported by the front bearing 4 and the tip thereof is exposed to the outside through the center of the front bracket 1. And a pulley (3) is fastened to the tip of the rotary shaft (2) through a hexagon nut (5), which is connected to the engine drive shaft (not shown) via a belt (not shown). In addition, a washer 7 is provided below the hexagon nut 5 to prevent the hexagon nut 5 from loosening.

That is, when the pulley 3 is inserted into the end of the rotating shaft 2 and the washer 7 and the hexagon nut 5 are tightened to the male screw machined on the end of the rotating shaft 2, the washer 7 is removed by the washer 7. 5) is prevented from loosening and the pulley 3 remains firmly coupled. Reference numeral 6 is a ring-shaped spacer installed on the outer circumferential surface of the rotating shaft 2 between the pulley 3 and the front bearing 4 to space them apart, and the pulley 3 and the front bearing 4 are in direct contact with each other. While preventing the pulley (3) and the front bearing (4) is supported to be firmly fastened to the end of the rotation shaft (2).

However, such a conventional alternator has a problem in that the manufacturing cost increases due to the large number of parts of the transmission medium that delivers engine power. That is, separate components such as washers 7 and hexagon nuts 5 are added to fix the pulley 3 to the end of the rotation shaft 2, thereby increasing manufacturing cost and lowering assembly workability.

The present invention is to solve this problem, the object of the present invention is to form a coupling part in which the female thread line is processed in the center of the pulley and directly coupled to the end of the rotating shaft without additional parts, thereby reducing the number of assembly parts to reduce the manufacturing cost It is to provide a vehicle alternator for reducing and improving assembly workability.

1 is a cross-sectional view schematically showing a pulley coupling structure of the rotation shaft end of the conventional alternator.

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

Figure 3 is an exploded perspective view showing the pulley and the rotating shaft end according to the present invention.

Figure 4 is an enlarged cross-sectional view of the A portion shown in Figure 2, showing a coupling structure of the pulley according to the present invention.

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

10 .. Front bracket 101. Seat 102. Through-hole

103. Inward flange portion 32. Rotating shaft 34. Pulley

341. Coupling part 342. Female thread 343. Chamfering part

35..Front Bearing

The present invention for achieving the object, the front bracket and the rear bracket forming the exterior, the rotor is installed rotatably inside the front, the rear bracket, the axial indentation in the center of the rotor and the male thread on the end peripheral surface Machined rotating shaft, through hole drilled in the center of the front bracket so that the end of the rotating shaft extends to the outside, and is coupled to the end of the rotating shaft extending outward through the through hole, and has a pulley that rotates integrally with the rotating shaft by receiving power In the automotive alternator,

The pulley is characterized in that it comprises a socket-shaped coupling portion, the female thread line is processed on the inner peripheral surface to be engaged with the rotary shaft end in the center, the chamfered on the outer peripheral surface of the coupling portion to tighten the coupling portion through the tightening tool.

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. And Figure 3 is a perspective view of the rotary shaft end and the pulley according to the present invention, Figure 4 is a cross-sectional view of the main portion showing a coupling state of the pulley.

Alternator for a vehicle according to the present invention, as shown in these, the stator 20 and the rotor inside the front bracket (10, front bracket) and the rear bracket (11, rear bracket) forming a plurality of exhaust holes formed 30 is provided, and electrical components are mounted on the outside of the rear bracket 11. The front bracket 10 and the rear bracket 11 are installed to face each other and are bound by a bolt extending to a predetermined length to surround the stator 20 and the rotor 30.

The stator 20 is firmly fixed to the inner circumference 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.

The rotor 30 is composed of a pair of pole cores 31 in which the field coil 33 is wound, and the rotating shaft 32 is press-fitted in the axial direction at the center thereof. Both ends of the rotating shaft 32 are supported by the bearings 34 and 35 to facilitate the rotational movement. The front bearing 35 is mounted at the center of the front bracket 10 to support one end of the rotating shaft 32. It is distinguished by a rear bearing 36 seated at the center of the rear bracket 11 and supporting the other end of the rotation shaft 32.

At the end of the rotating shaft 32 extending outside the rear bracket 11, a pair of slip rings 40 are provided so that the tip of the brush 51 always slips friction, and the alternating current, which is an electrical functional component of the generator, is connected to a direct current. Rectifier 70 for converting, brush holder 50 with a built-in brush 51, voltage regulator 60 for controlling the field current supplied to the field coil 33 and the output voltage of the generator through the brush 51 Etc., and the end cover 12 surrounds them.

In addition, a pulley 34 connected to an engine driving shaft (not shown) of the vehicle is coupled to an end portion of the rotating shaft 32 extending outside the front bracket 10 through a belt (not shown). Between the 34 and the front bearing 35 is provided with a spacer (80, spacer 80) to secure them by spaced apart at regular intervals, the detailed coupling structure of the pulley 34 is as follows.

First, a seating portion 101 is molded in the center of the front bracket 10 so that the front bearing 35 is fitted and seated therein, and a through hole through which the end of the rotation shaft 32 penetrates freely through the center of the seating portion 101 ( 102 is perforated.

And the male threaded line 321 is machined on the outer circumferential surface of the front end of the rotating shaft 32 extending outside the front bracket 10 through the through hole 102, the female threaded line 342 in the center of the pulley 34 is coupled thereto ) Is formed integrally with the engaging portion 341.

The coupling part 341 provided at the center of the pulley 34 is provided in the shape of a socket, and the female thread line 342 is formed on the inner circumferential surface of the coupling part 341 so that the distal end portion and the coupling part 341 of the rotation shaft 32 are separated. Combined. In addition, the coupling portion 341 exposed to the outside has a chamfered portion 343 which is surface-processed to tighten it using a tightening tool and forms an outer circumferential portion of a regular hexagon.

At this time, the female thread line 342 direction of the coupling portion 341 is preferably processed to receive the tightening force in the rotational direction when the pulley 34 rotates to prevent its loosening phenomenon.

Therefore, the spacer 80 is inserted into the distal end of the rotating shaft 32 exposed to the outside of the front bracket 10 through the through hole 102, and then a tightening tool such as a socket wrench is used to hold the pulley 34. When the coupling portion 341 is engaged with the rotary shaft 32, one end of the spacer 80 contacts the inner ring side end portion of the front bearing 35, and the other end thereof contacts the inner surface of the pulley 34. Then, when the pulley 34 is firmly tightened, both ends of the spacer 80 are compressed between the front bearing 35 and the pulley 34 to keep them at a predetermined interval, and the tightening force of the pulley 34 is the spacer 80. It extends to the front bearing 35 through. Further, if the pulley 34 is completely tightened and then slightly plastically deformed so as to compress the end of the coupling portion 341 which is engaged with the front end of the rotating shaft 32, the loosening phenomenon due to the rapid deceleration of the rotating shaft 32 is prevented. .

Accordingly, by coupling through the coupling portion 341 integrally formed on the pulley 34 without the need for a separate nut to couple the pulley 34 to the end of the rotating shaft 32, manufacturing cost is reduced due to the reduction of the number of parts Assembly workability is improved.

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 the engine driving shaft (not shown) and the belt (not shown), and at the same time, the rotating shaft 32 At the other end of the), the tip of the brush 51 is continuously rubbed against the outer circumferential surface of the slip ring 40. Accordingly, excitation current is generated by supplying an excitation current to the field coil 33 of the rotor 30 through the voltage adjusting device 60, 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 70 and supplied to each electric device of the vehicle.

The alternator receives power from an engine driving shaft (not shown) via a pulley 34 and performs a power generation function by rotating the rotor 30 at high speed. The pulley 34 is integrally provided at a central portion with a coupling part ( By engaging the front end portion of the rotary shaft 32 via 341, a separate nut or the like is not necessary. In addition, since the female thread line 342 of the coupling portion 341 is formed to receive a tightening effect when the rotating shaft 32 rotates, no loosening occurs during operation.

As a result, the pulley 34 is coupled to the rotary shaft 32 through the coupling portion 341, thereby reducing manufacturing cost due to the reduction of the number of parts and greatly improving the assembly workability.

As described above in detail, the vehicle alternator according to the present invention has a front bearing for supporting the end of the rotation shaft is seated on the center of the front bracket in which the through hole is formed, and pulley (pully) at the end of the rotation shaft extending through the through hole to the outside Is coupled to the inner circumferential surface on the center of the pulley is formed integrally with the socket-shaped coupling portion machined female thread. Therefore, by separately engaging the pulley to the front end of the rotary shaft through the coupling portion without the need for a separate nut, the manufacturing cost is reduced due to the reduction of the number of parts, there is an advantage that the assembly process is simplified.

Claims (1)

The front bracket 10 and the rear bracket 11 forming the exterior, the rotor 30 is rotatably installed inside the front and rear brackets (10, 11), the axial direction in the center of the rotor (30) And a through hole 102 drilled in the center of the front bracket 10 so that the end of the rotating shaft 32 extends to the outside, the screw shaft 321 is machined on the outer circumferential surface of the end portion. In the automotive alternator having a pulley (34) coupled to the end of the rotary shaft 32 extending to the outside through the ball 102 and receives power to rotate integrally with the rotary shaft 32, The pulley 34 is a socket-shaped coupling portion 341, the female threaded line 342 is processed on the inner peripheral surface so as to be engaged with the end of the rotation shaft 32 in the center portion, tightening the coupling portion 341 through the tightening tool Vehicle alternator having a surface chamfered portion (343) to the outer peripheral portion of the coupling portion 341 so as to be able to.