KR200170966Y1 - Alternator - Google Patents

Abstract

The present invention reforms the disclosed automotive alternator.

In the related art, vibrations are generated between the bearing and the retainer during the high speed rotation of the rotor shaft, so that the retainer fixing screw is loosened.

In the present invention, a rubber anti-vibration pad is provided between the bearing and the retainer to absorb the vibration of the bearing due to the rotation of the rotor shaft, thereby preventing the retainer fixing screw from loosening, thereby making the bearing support stable.

Description

Automotive Alternator

1 is a cross-sectional view showing an example of a general automotive alternator.

Figure 2 is an exploded perspective view showing the main parts extract showing the alternator according to the present invention.

3 is a cross-sectional view of the coupled state.

* Explanation of symbols for main parts of the drawings

EF: end frame RS: rotor shaft

P: pulley B: bearing

T: Retainer A: Dustproof Pad

S: Stator

The present invention relates to an automobile, and more particularly to an alternator used to supply power to various electrical devices.

An automobile is a device that drives itself on land by an engine driven by gasoline, diesel, or gas. Such automobiles are equipped with electric devices such as various steering devices, engines such as engine starters and ignition devices, and various lamps for night lighting. Accordingly, the vehicle is provided with a battery and a generator as a power source for supplying electricity to these electric devices. The battery is used to start the engine by charged electricity and the generator is driven by the engine to generate electricity. The battery is charged at the same time that the device is supplied with electricity, so the generator is an indispensable element in the car.

Such a generator is divided into a DC generator and an AC generator according to the waveform of the generated current, and an AC generator is generally used.

1 shows an example of such an automotive alternator. When the ignition switch of the engine is inserted, an exciting current of a battery (not shown) flows through a slip ring (SR) to a rotor coil (RC) to generate magnetic lines in the rotor (R). Subsequently, when the engine is started, the pulley P connected to the belt (not shown) is rotated by driving the engine, thereby rotating the rotor shaft RS. Accordingly, when the rotor R is rotated, the rotor R and the stator ( Due to the interaction of the stator: S, a power generation action occurs in the stator coil SC to generate an alternating current. The alternating current generated in this way is rectified to a direct current by a diode (D), and then supplied to each electric device and charged to the battery at the same time.

In this way, since the alternator is generated by the driving of the engine, the rotor shaft RS must rotate exactly in response to the rotational speed of the engine for the generation efficiency.

To this end, a bearing B is installed in the mounting groove G of the end frame EF so that the rotor shaft RS can be rotated smoothly, and the bearing B includes a plurality of screws ( It is fixed to the end frame EF by the retainer T which is fixed to the end frame EF by screw: W. The remaining symbol F is a fan for cooling the generator, and PR is a snap ring (PR) for supporting the rotor shaft RS to the end frame EF.

However, in the conventional AC generator, not only the bearing B is supported on the end frame EF by the contact of the retainer T, but the retainer T is fixed to the end frame EF by the plurality of screws W. Therefore, when the rotor shaft RS rotates at a high speed, vibration generated in the bearing B is transmitted to the retainer T and the screw W, so that the fixing state of the screw W is loosened. As a result, the support of the bearing B to the end frame EF becomes unstable, and the rotation of the rotor shaft RS becomes unstable, resulting in an unstable current, thereby preventing the stability and reliability of the AC generator.

It is an object of the present invention to provide a vehicular alternator which can effectively prevent vibration of a bearing and a retainer and a screw fixing the same to an end frame when the rotor shaft is rotated in view of the above-described conventional problems.

In order to achieve the above object, the automotive alternator according to the present invention includes a rotor fixed to an end frame, a rotor shaft driven by a stator and an engine supported by the end frame, and mounted on the end frame to prevent rotation of the rotor shaft. In a vehicular alternator having a guiding bearing and a retainer fixed to the end frame by a plurality of screws to support the bearing to the end frame, a ring-shaped anti-vibration pad is provided between the bearing and the retainer. It is done.

According to one preferred feature of the present invention, the dustproof pad is made of a rubber material.

Accordingly, the present invention, since the vibration of the bearing due to the high speed rotation of the rotor shaft is effectively absorbed and can not be transmitted to the retainer and the screw fixing it, the bearing support state is very stable, thereby improving the stability and reliability of the alternator. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, the alternator according to the present invention is rotatably supported on the end frame (EF) of the rotor shaft (RS) holding the rotor (R) is prevented from being separated by the snap ring (PR) Is supported. Around the rotor R, a stator S for generating alternating current and transmitting power to a diode (D in FIG. 1) is fixed to the end frame EF. A pulley P connected to the belt by an engine (not shown) is fixed to one end of the rotor shaft RS protruding to the outside of the end frame EF, between the pulley P and the end frame EF. The rotor shaft RS is installed with a fan for cooling the generator.

On the other hand, the mounting groove (G) formed on one side of the end frame (EF) is provided with a bearing (B) for supporting the rotor shaft (RS) to rotate smoothly, the bearing (B) is a plurality of screws (W) It is fixed to the end frame EF by the retainer T fixed to the end frame EF by this.

According to a feature of the present invention, the bearing (B) is interposed between the retainer (T) of the ring-shaped anti-vibration pad (A) for absorbing the vibration of the retainer (T) and the screw (W) for fixing it. The anti-vibration pad (A) may be configured in various ways, preferably, a rubber material having an appropriate thickness. In the antivibration pad A, a slot Sa is formed in the center portion so that the rotor shaft RS can pass therethrough, and a plurality of support holes through which a plurality of screws W penetrate around the slot Sa, respectively. Ha is formed to correspond to the retaining holes T and the support holes Ht Hf of the end frame EF.

Vehicle alternator according to the present invention having such a structural feature is provided with a vibration pad (A) between the bearing (B) and the retainer (T), even if the rotor shaft (RS) at high speed by the engine bearing (B) The vibration between the retainer and the retainer T is not generated at all, so that the bearing B can be stably supported. That is, since the bearing (B) is conventionally supported on the end frame (EF) by contact with the retainer (T) and the retainer (T) is fixed to the end frame (Ef) by a plurality of screws (W), the rotor shaft (RS). When rotating at this high speed, the vibration of the bearing (B) is transmitted to the retainer (T) and the screw (W) to loosen the fixed state of the screw (W), the present invention is a dustproof pad of rubber material interposed therebetween (A) By virtue of the vibration of the bearing B due to the rotation of the rotor shaft RS, the transmission to the retainer T is reliably blocked. Accordingly, since the screw W can firmly maintain the fixed state of the retainer T with respect to the end frame EF, stable support of the bearing B becomes possible. Therefore, the rotation of the rotor shaft RS is stabilized, and the generated current to the stator S is also very stable.

As such, according to the present invention, since the vibration of the bearing due to the rotation of the rotor shaft can be effectively absorbed, the support state of the bearing relative to the end frame becomes very stable. Accordingly, the present invention has the effect of improving the stability and reliability of the vehicle alternator.

Claims (2)

A rotor fixed to an end frame, a rotor shaft driven by a stator and an engine supported by the end frame, a bearing attached to the end frame to guide rotation of the rotor shaft, and fixed to the end frame with a plurality of screws. An on-vehicle alternator having a retainer for supporting the bearing on an end frame, wherein the anti-vibration pad (A) is provided between the bearing (B) and the retainer (T). The vehicle alternator according to claim 1, wherein the dustproof pad (A) is made of a rubber material.