KR20000016744U - Rear bearing fixed apparatus of alternator - Google Patents

Abstract

The present invention relates to a rear bearing fixing device of an automotive alternator, the purpose of which is to bolt the rear bearing to the bearing housing of the rear bracket to prevent its flow.

The rear bearing 36 of the alternator for a vehicle according to the present invention is fitted into a bearing housing 111 formed on the center of the rear bracket 11 to be rotatably supporting an end of the rotating shaft 32, and has a radius in the bearing housing 111. A bolt hole 114 penetrating in the direction is formed. Then, by tightening the bolts 115 to the bolt hole 114 so that the front end portion is pressed against the outer ring of the rear bearing 36, the rear bearing 36 remains firmly fixed without flowing.

Therefore, since the rear bearing 36 is fixed in the bearing housing 111 through a simple bolt 115 tightening operation, the production cost is higher than that of the conventional O-ring or bearing cover made of expensive resin. Is significantly reduced, as well as the assembly workability is improved.

Description

Rear bearing fixed apparatus of alternator for vehicle

The present invention relates to a rear bearing of an automotive alternator, and more particularly, to a rear bearing fixing device installed on the center of the rear bracket to support the end of the rotating 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 AC 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 surrounds them. It is composed of front and rear to form an exterior body and has a pair of exhaust vents through which air is sucked and exhausted. A rotor made of a pair of polcoa is built in, and the stator is installed in the inner circumference of the front and rear brackets so as to surround the rotor while maintaining a constant interval. Winding.

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.

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.

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 converted to direct current through a rectifier and supplied to each part of the vehicle.

In order to improve the output characteristics of such an alternator, the rotor should rotate smoothly inside the stator. To this end, both front ends and rear bearings are provided at both ends of the rotating shaft to support the rotational movement of the rotating shaft.

As shown in the drawing, the rear bearing 3 made of a radial ball bearing is fitted into the bearing housing 2a formed on the center of the rear bracket 2, and is coupled to the center of the bearing housing 2a. The through hole 2b is perforated so that it can penetrate with ease. The inner diameter of the bearing housing 2a is slightly larger than the diameter of the rear bearing 3, so that a sliding tolerance occurs, so that the outer ring 3b of the rear bearing 3 is fitted into the bearing housing 2a and engaged.

That is, the rear bearing 3 is slidably coupled to the bearing housing 2a of the rear bracket 2 after the end of the rotation shaft 1 is inserted into the inner ring 3a. Accordingly, the outer ring 3b of the rear bearing 3 is fitted into the bearing housing 2a through sliding tolerances, and the inner ring 3a is press-fitted and fixed to the outer circumferential surface of the end of the rotation shaft 1 so that the outer ring 3b and inner ring ( The rotary shaft 1 is rotated by the rolling motion of the steel ball 3c provided between the 3a.

However, in such a coupling structure of the rear bearing 3, since the outer ring 3b of the rear bearing 3 is fitted into the bearing housing 2a simply by sliding tolerance, the inner circumferential surface of the bearing housing 2a and the outer ring ( A gap between 3b) is generated, which causes the outer ring 3b to slide inside the bearing housing 2a.

As a result, the rear bearing 3 flows in the center of the rear bracket 2, thereby lowering the bearing capacity of the rotating shaft 1 and causing damage due to friction between the outer ring 3b and the inner circumferential surface of the bearing housing 2a. This is the cause of the creep phenomenon that the deformation increases with time.

In order to solve this problem, the rear bearing 3 is provided by installing an O-ring (not shown) or a bearing cover (not shown) between the outer ring 3b of the rear bearing 3 and the inner circumferential surface of the bearing housing 2a. The outer ring (3b) of the creep phenomenon was prevented. However, such an O-ring or bearing cover is made of expensive resin having a resistance to high temperature, which causes a rise in manufacturing cost, and requires a separate assembly process, thereby degrading overall assembly workability.

The present invention is to solve this problem, an object of the present invention is the outer ring of the rear bearing rotatably supporting the end of the rotating shaft is coupled to the bearing housing formed in the center of the rear bracket, the bolt housing in the radial direction to the bearing housing It is to provide a rear bearing fixing device for an automotive alternator to form a and secure the bolt to it, the outer ring of the rear bearing firmly fixed without flowing inside the bearing housing.

1 is a schematic view showing a coupling structure of a conventional rear bearing.

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

Figure 3 is an exploded perspective view showing an extract of the fixed structure of the rear bearing according to the present invention.

Figure 4 is a cross-sectional view taken to extract the rear bearing fixed state according to the present invention.

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

11..Rear bracket 111.Bearing housing 112.Through hole

113..inner side 114.bolt ball 115.bolt

32. Rotating shaft 36. Rear bearing 361. Outer ring

362.Inner ring

The present invention for achieving the object, the front bracket and the rear bracket forming the exterior, the rotor is installed rotatably in the front, the rear bracket, the axial direction in the rotor center so that the rotor is rotated by the vehicle engine drive It is installed in the center of the rear bracket so as to rotatably support the rotating shaft which is press-fitted and the end of the rotating shaft, and the rear bearing which is press-fitted and fixed through the inner ring to the end of the rotating shaft, In the automotive alternator with a bearing housing formed in the center,

Bearing housings are provided with bolted holes and bolted holes that communicate with the inner circumferential surface of the rear bearing outer ring, and bolts whose end portions are squeezed to the outer ring of the rear bearing so that the outer ring of the rear bearing is fixed without flowing inside the bearing housing. It is characterized by.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings. Figure 2 is a cross-sectional view showing the overall structure of the vehicle alternator according to the present invention, Figures 3 and 4 are a perspective view and a cross-sectional view showing an extract of the fixed structure of the rear bearing 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 in which an exhaust port is formed, forming an outer body, and the rear. Electrical components are attached to the outside of the bracket 11. The front bracket 10 and the rear bracket 11 are bound to face each other 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 from the center thereof.

At the end of the rotating shaft 32 extending outward through the center of the front bracket 10, a pulley 34 connected to an engine driving shaft (not shown) of the vehicle via a belt (not shown) is provided with a nut 37. Are combined through.

At the end of the rotation shaft 32 extending through the rear bracket 11 to the outside, a pair of slip rings 40 and lead wires 41 are always provided with the tip of the brush 51 slip-frictiond, and around the generator The rectifier 70 for converting alternating current, which is an electrical functional part, to a direct current, a brush holder 50 with a built-in brush 51, and an output voltage through field current control supplied to the field coil 33 through the brush 51. And a voltage adjusting device 60 for maintaining the constant value, and the end cover 12 surrounds them.

On the other hand, the rotary shaft 32 which is integrally rotated by the engine drive is supported by both ends of the radial ball bearing (radial ball bearing) so that the rotational movement is smooth, this is the rotary shaft 32 in the center of the front bracket 10 The front bearing 35 supporting one end and the rear bearing 36 supporting the other end of the rotating shaft 32 at the center of the rear bracket 11 are distinguished.

The front bearing 35 has a cylindrical spacer 38 between its side end and the pulley 34. Accordingly, the tightening force of the nut 37 is transmitted to the front bearing 35 through the spacer 38 to maintain the front bearing 35 firmly fixed at the center of the front bracket 10.

And the rear bearing 36 in the center of the rear bracket 11 is firmly fixed without flowing using the bolt 115, the detailed structure thereof is as follows.

First, the rear bearing 36 is composed of a ring-shaped outer ring (361) and inner ring (362), a plurality of steel balls (363), such as rolling movement between them and prevented from being separated by the retainer (364), the inner ring ( 362) it is press-fitted to the outer circumferential surface of the other end of the rotating shaft 32 through the center.

In addition, a bearing housing 111 having the same shape as the outer ring 361 is formed at the center of the rear bracket 11 so that the rear bearing 36 is fitted and coupled thereto, and a slip ring 40 is formed at the center of the bearing housing 111. The through hole 112 is formed so that the other end of the provided rotating shaft 32 penetrates to the outside. The bearing housing 111 is formed to surround the outer ring 361 of the rear bearing 36, and its inner diameter D is configured to be slightly larger than the outer diameter D1 of the outer ring 361 of the rear bearing 36 to constitute a rear bearing. It is desirable to have sliding tolerances so that 36 fits loosely and engages.

In addition, the bearing housing 111 of the rear bracket 11 communicates with the inner circumferential surface 113, and bolt holes 114 having a female thread line are drilled to be spaced apart at regular intervals in a radial direction so that the bolts 115 are tightened. The bolt 115 is tightened through the bolt hole 114 so that the front end portion is compressed with the outer ring 361 of the rear bearing 36, so that the rear bearing 36 is firmly fixed without being flown.

That is, the rear bearing 36 is coupled to the other end of the rotary shaft 32 through the inner ring 362, and then exposed to the outside of the rear bracket 11 through the through hole 112, the outer ring 361 of the rear bearing 36 ) Is fitted to the bearing housing 111 formed in the center of the rear bracket 11 by sliding tolerance.

When the bolts 115 are tightened to the respective bolt holes 114 in this state, the tip of the bolt 115 is radially applied to the outer ring 361 opposite the inner circumferential surface 113 of the bearing housing 36, The outer ring 361 of the rear bearing 36 is firmly fixed inside the bearing housing 111.

Therefore, by tightening the general bolt 115 to the bearing housing 111 to prevent the flow and creep phenomenon of the rear bearing 36, the manufacturing cost is significantly reduced compared to the conventional O-ring or bearing cover, as well as assembly work Sex 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 a belt (not shown), and at the same time, the brush (at the other end of the rotating shaft 32) The tip end portion of 51) continuously rubs 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 is smoothly operated because both ends of the rotating shaft 32 are rotatably supported by the front bearing 35 and the rear bearing 36, and are connected to the bearing housing 111 of the rear bracket 11. The combined rear bearing 36 is firmly installed without flowing through the bolt 115 as described above to prevent the creep phenomenon. In addition, since the bolt 115 is commonly used, manufacturing cost is reduced and assembly workability is improved as compared to the O-ring or the bearing cover used for creep prevention of the rear bearing outer ring.

As described in detail above, the rear bearing of the automotive alternator according to the present invention is inserted into a bearing housing formed on the center of the rear bracket to be coupled to rotatably support the end of the rotating shaft, and a bolt hole penetrating radially in the bearing housing is formed. have. Then, by tightening the bolt in the bolt hole so that the front end portion is compressed to the outer ring of the rear bearing, the rear bearing remains firmly fixed without flowing.

Therefore, as the rear bearing is fixed inside the bearing housing through a simple bolt tightening operation, manufacturing costs are significantly reduced compared to conventional O-rings or bearing covers made of expensive resins. Sex also has an advantage.

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 and 11, and the rotor 30 is connected to the vehicle engine drive. It is installed in the center of the rear bracket 11 to rotatably support the end of the rotary shaft 32, the rotary shaft 32 is axially press-fitted to the center of the rotor 30 to be rotated by the power, A bearing formed at the center of the rear bracket 11 so that the rear bearing 36 press-fitted and fixed to the end of the rotating shaft 32 through the inner ring 362 and the outer ring 361 of the rear bearing 36 are fitted in a relaxed manner. In the automotive alternator having a housing 111, The bearing housing 111 is coupled to the bolt hole 114 and the bolt hole 114 which are perforated to communicate with the inner circumferential surface 113 facing the outer ring 361 of the rear bearing 36 and the rear bearing 36. The vehicle alternator is provided with a bolt 115, the front end of which is pressed against the outer ring 361 of the rear bearing 36 so that the outer ring 361 of the rear bearing 36 is fixed without being flowed in the bearing housing 111. Rear bearing retainer.