KR20010096222A - Alternator for vehicle - Google Patents

Abstract

PURPOSE: A motor vehicle AC generator having explosion proof structure is provided to prevent deterioration of operation reliability of AC generator by easily discharging foreign substances generated due to contact of the brush with slip ring. CONSTITUTION: An AC generator comprises a stator assembly having a stator core and a stator coil; a rotor shaft(20) arranged to receive power transmitted from the stator assembly; a spool bobbin coupled to the intermediate portion of the rotor shaft and connected with a slip ring(22); a core coupled to the rotor shaft inside of the spool bobbin; a rotor assembly arranged outside of the core, and which has a driver end segment and a slip ring segment which are press fit so as to accommodate the spool bobbin; a brush holder(35) arranged outside of the slip ring, and which has a brush(31) for applying power from a battery to a rotor coil through the slip ring so as to magnetize the driver end segment and slip ring segment; and a cap(44) located in a groove(43) formed at the inner surface of a rear cover(42) so as to close the brush holder. The brush holder has a foreign substance outlet path(50) formed inside of the brush holder so as to discharge foreign substances generated by the abrasion of the brush, and the cap closing the brush holder has an external air inlet path(60) which allows foreign substances to be easily discharged.

Description

Automotive alternator with explosion-proof structure {Alternator for vehicle}

The present invention relates to an automotive alternator having an explosion-proof structure, and more particularly, such as carbon generated by brush wear by improving a brush holder and related parts fixing a brush connected to a slip ring mounted at an end of a rotor shaft. The present invention relates to the provision of an improved alternator for improving the discharge of foreign matter.

The automotive alternator is one of the engine electronics, which is connected to the engine and the belt to charge the consumed battery power and to supply the current required for operation with other electronics.

The automotive alternator is largely composed of a stator assembly press-fitted between a driver and a slip ring end frame and a rotor assembly supported by a rotor shaft inside thereof.

Outside the slip ring of the rotor assembly is a configuration that is provided with a voltage regulator and the like to rectify the generated alternating current into a direct current to the battery to charge and maintain the generated voltage in a constant state.

In the alternator as described above, the brush holder is connected to the slip ring mounted at the end of the rotor shaft to supply the battery power so that the current through the slip ring is applied to the rotor coil and magnetic lines are generated in the segment located outside the rotor coil. In the stator coil, three-phase exchange is induced to allow power generation.

Conventionally, a brush holder for fixing the brush electrically connected to the slip ring and the protection of the slip ring mounted on the end of the rotor shaft is provided.

The brush holder of the prior art is fixed with the slip ring received between the inner side and the rear cover of the slip ring end frame via the bearing to maintain the rotor shaft.

The inner side of the brush holder is sealed through an O-ring for airtightness in the receiving jaw formed in the slip ring end frame, and the outer side is closed by a cap tightly fixed to the receiving groove formed in the inner side of the rear cover.

The brush holder of the prior art as described above is blocked by the inflow of moisture or foreign matter in the direction of the slip ring mounted on the end of the rotor shaft, the flammable material is introduced into the brush holder and the flame caused by the spark generated by the connection between the brush and the slip ring This has a point that is prevented from leaking to the outside.

However, since the brush holder is in a completely closed state, the brush is in contact with the slip ring, and thus foreign substances such as brush carbon generated by the wear of the brush cannot be discharged to the outside.

As described above, when foreign matters such as brush carbon cannot be discharged to the outside, accumulated foreign matter penetrates into each part such as bearings or between bearings and rotor shafts, and thus it is impossible to maintain smooth operability. It is the cause of harm.

In the present invention, to solve the problems as described above, the foreign matter caused by the contact of the brush and the slip ring is easily discharged to the outside of the brush holder while preventing the foreign matter from entering the outside to exclude the risk of explosion-proof foreign matter It aims to prevent the deterioration of operability and quality by AC generator.

1 is an overall cross-sectional view of an alternator to which the technique of the present invention is applied.

2 is a cross-sectional view taken a portion A of FIG.

FIG. 3 is a front view of a partially fractured cross section seen in the direction B of FIG. 2; FIG.

Figure 4 is a bottom view of the brooch holder mounted to the alternator to which the technique of the present invention is applied.

* Description of the symbols used in the main parts of the drawings *

10; Alternator

15; Stator Assembly

30; Rotor Assembly

35; Brush holder

50; Foreign substance discharge passage

51,52; Guiding Block

55; Air outlet

60; Air inlet passage

61; Inlet hole

62; Suction hole

65; Air passage

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the preferred embodiment of the present invention for achieving the above object.

1 is an overall cross-sectional view of an alternator to which the technique of the present invention is applied, FIG. 2 is a cross-sectional view taken from a portion A of FIG. 1, FIG. It demonstrates together as a bottom view of the broth holder mounted to the alternator to which the technique of this invention was applied.

In the automotive alternator 10, as illustrated in FIG. 1, a stator assembly 15 including a stator core 13 and a stator coil 14 is press-fitted between a driver and slip ring end frames 11 and 12. do.

The rotor shaft 20 which is supported by the bearing 16 fixed to the driver and the slip ring end frames 11 and 12 in the inner side of the stator assembly 15 and has a pulley 18 so as to receive power at the front end thereof. ) Is installed in the transverse direction.

In the middle of the rotor shaft 20 is coupled to the spool bobbin 23 wound around the rotor coil 21 and connected to the slip ring 22 press-fitted to the rear of the rotor shaft 20.

The core 24 is coupled to the rotor shaft 20 in the inner side of the spool bobbin 23, and the driver end segment 25 and the slip ring end segment 26 are press-fitted to the outside of the core 24 to spool the bobbin. The rotor assembly 30 of the structure which accommodates 23 is provided.

Outside the slip ring 22 of the rotor assembly 30, the battery power is applied to the rotor coil 21 through the slip ring 22 to incorporate a brush 31 for magnetizing each segment 25 and 26. The brush holder 35 is connected.

Outside of the brush holder 35 as a means for rectifying the voltage regulator 33 and the alternating AC regulated by direct current to maintain a constant voltage generated in the rotor and stator assembly (20, 15) A rectifier 34 is formed which includes a heat sink, a diode, a terminal, and the like.

The inner side of the brush holder 35 is coupled to the settled surface 40 formed on the slip ring end frame 12 via a rubber-based airtight material 41 as a means for airtightness, and an outer side of the brush holder 35. The cap 44 is placed in the settling groove 43 formed inside the 42 is finished.

In the operation of the alternator 10 as described above, when the engine starts, the rotor shaft 20 rotates the power of the engine, and at the same time, the battery power is supplied through the brush 31 connected to the slip ring 22. A current is applied to the rotor coil 21 to generate magnetic lines of force in the segments 25 and 26 located outside the rotor coil 21.

At this time, since the rotor shaft 20 rotates, three-phase alternating current is induced in the stator coil 14 and applied to the diode of the rectifier 34. The diode, which is applied to the three-phase alternating current, is full-wave rectified to be higher than the voltage of the battery. It charges the full-wave rectified current and supplies current to other electronics.

When the voltage exceeds the prescribed value during the power generation process, the voltage regulator 33 operates to maintain a constant voltage state, and the engine is stopped to prevent the current from the battery to the generator to flow back by the diode. It is the operation that is done.

In the present invention, while receiving the slip ring 22 mounted on the end of the rotor shaft 20, the brush holder 35 for fixing the brush 31 which is electrically connected to the slip ring 22 and the related parts to improve the brush (31) It is characterized in that it is possible to easily block the inflow of foreign substances while easily discharging the foreign substances generated by the wear of the outside.

To this end, in the present invention, the foreign matter discharge passage 50 is formed on one side of the brush holder 35 so as to discharge the foreign matter generated by the wear of the brush 31, and the cap 44 provides the ease of the foreign matter discharge. It is configured to have an air inlet passage 60 for the external air inlet to.

The foreign substance discharge passage 50 is formed by protruding a plurality of guiding blocks 52 on the bottom surface of the passage 51 formed integrally with the brush holder 35 to be discharged together with the air introduced therein. .

The guiding block 52 is preferably formed in a zigzag type to block the outflow of the flame to the outside when explosion-proof.

Cooling fan 56 fixed to the rotor shaft 20 by forming an air outlet 55 on the slip ring end frame 12 connected to the end of the discharge passage 53 formed by the guiding block 52. To enable rapid discharge.

The air inflow passage 60 forms an inlet hole 61 in the rear cover 42 to introduce external air, and introduces the air introduced into the inlet hole 61 into the brush holder 35. In order to form a suction hole 62 in the cap 44 of the brush holder 35.

In the settling groove 43 of the rear cover 42, an air flow passage 65 is further formed to smoothly flow the air between the inlet hole 61 and the suction hole 62.

The present invention configured as described above;

When the engine is started, the rotor shaft 20 rotates the engine's power, and at the same time, the power of the battery is applied to the rotor coil 21 through the brush 31 connected to the slip ring 22 and the rotor is rotated. Magnetic lines of force are generated in the segments 25 and 26 located outside the coil 21.

At this time, since the rotor shaft 20 rotates, three-phase alternating current is induced in the stator coil 14 and applied to the diode of the rectifier 34. The diode, which is applied to the three-phase alternating current, is full-wave rectified to be higher than the voltage of the battery. It charges the full-wave rectified current and supplies current to other electronics.

When the voltage exceeds the prescribed value during the power generation process, the voltage regulator 33 operates to maintain a constant voltage state, and the engine is stopped to prevent the current from the battery to the generator to flow back by the diode. It is the operation that is done.

In this operation, the brush 31 is in electrical contact with the slip ring 22, so that the foreign matters such as brush carbon are generated while the brush 31 wears.

Then, outside air flows in through the inlet hole 61 formed in the rear cover 42 of the alternator 10, and the introduced air passes through the air flow passage 65 and the suction hole 62 of the cap 44. It is introduced into the brush holder 35 through the).

The introduced air discharges the foreign substances generated by the contact between the brush 31 and the slip ring 22 to the outside of the brush holder 35. The foreign substances together with the external air are formed on one side of the brush holder 35. It is discharged through the discharge passage (50).

It is discharged through the air outlet 55 formed in the slip ring end frame 12 via the discharge path 53 formed by the guiding block 52 formed in a zigzag type in the foreign substance discharge passage 50. .

In particular, the outer side of the air outlet 55 formed in the slip ring end frame 12 is fixed to the rotor shaft 20 in the state in which the cooling fan 56 is in close proximity and rotates due to the suction force of the cooling fan 56. Air is exhausted to the outside more quickly.

As the flame is discharged to the outside by the air introduced as described above, the flame is not completely escaped from the discharge path 53 formed in the zigzag type, and because it is metallic, it cools while facing the cold slip ring end frame 12. You will not have any problems.

The present invention as described above is to easily discharge the foreign substances generated by the contact of the brush and the slip ring to the outside of the brush holder to prevent foreign substances from entering the outside to exclude the risk of explosion-proof and to reduce the operability and quality of the alternator by the foreign substance. It can prevent such effects.

Claims (3)

A stator assembly 15 including a stator core 13 and a stator coil 14 between the driver and the slip ring end frames 11 and 12; A rotor shaft (20) installed with a pulley (18) at its tip to receive power in an inward transverse direction of the stator assembly (15); A spool bobbin (23) coupled to the slip ring (22) press-fitted to the rear of the rotor shaft (20) by winding the rotor coil (21) in the middle of the rotor shaft (20); A core 24 coupled to the rotor shaft 20 in the inner side of the spool bobbin 23; A rotor assembly 30 in which the driver end segment 25 and the slip ring end segment 26 are press-fitted outside the core 24 to accommodate the spool bobbin 23; Outside the slip ring 22 of the rotor assembly 30, the battery power is applied to the rotor coil 21 through the slip ring 22 to incorporate a brush 31 for magnetizing each segment 25 and 26. The brush holder 35 is connected; The inner side of the brush holder 35 is coupled to the settled surface 40 formed on the slip ring end frame 12 via a rubber-based airtight material 41 as a means for airtightness, and an outer side of the brush holder 35. In the automotive alternator 10 of the configuration is closed with a cap 44 placed in the settling groove 43 formed inside the 42; Forming a foreign substance discharge passage 50 on one side of the brush holder 35 to discharge foreign substances generated by the wear of the brush 31; The cap 44 of the brush holder 35 has an explosion-proof structure for the automotive alternator, characterized in that configured to have an air inlet passage 60 for the inlet of external air for providing ease of foreign matter discharge. The method of claim 1; The foreign substance discharge passage 50 may include a guiding block 52 formed in a zigzag type on a bottom surface of the passage 51 formed integrally with the brush holder 35; Automotive having an explosion-proof structure characterized in that it comprises an air outlet (55) formed on the slip ring end frame 12 which is in contact with the end of the discharge passage 53 formed by the guiding block 52 Alternator. The method of claim 1; The air inflow passage 60 includes an inlet hole 61 formed in the rear cover 42 to introduce external air; A suction hole (62) formed in the cap (44) of the brush holder (35) so that the air introduced into the inlet hole (61) flows into the brush holder (35); Explosion-proof structure, characterized in that the inner groove 43 of the rear cover 42 further comprises an air flow passage 65 to smoothly flow the air between the inlet hole 61 and the suction hole 62 Automotive alternator having a.