JPS62213531A - Ac generator for vehicle - Google Patents

Abstract

PURPOSE:To effectively cool an AC generator by cooling a stator coil and a stator core by feeding coolant, and cooling a rectifier and a voltage regulator through a cooling cover. CONSTITUTION:Both ends of a stator coil 11 are surrounded by a metal enclosure 24 through an insulation resin filler 25. Coolant is fed to circumferential passages 32a, 32b formed between the inner walls of the front and rear brackets 26, 30 and the back surface of the enclosure 24. Recesses 26a, 30e for feeding coolant to the vicinity of the mount of front and rear side bearings 14, 15 are formed on the bracket 30. Coolant is partly branched to a branch passage 32c formed between the bracket 30 and a cooling cover 33 mounted on the bracket, and rectifier 16 and a voltage regulator 17 are mounted on the outer end of the cover 33.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicular alternator driven by an engine of a vehicle such as an automobile, and particularly relates to improved cooling.

[Conventional technology]

A conventional vehicular alternator has a cross-sectional view shown in FIG. Reference numeral 1 denotes a rotating shaft to which a pulley 2 is fixed. 8 is a rotor fixed to the rotating shaft 1, and is configured as follows. The number is the rotor core, 5 is one of the magnetic pole cores,
A plurality of magnetic pole claw portions 5a are provided at intervals in the circumferential direction. 6 is a non-magnetic support ring fixed to the inner periphery of the magnetic pole claw part 5a, 7 is the other magnetic pole iron core fixed to this support ring 6, and the plurality of magnetic pole claw parts 7a are spaced apart from each other in the circumferential direction. , and the magnetic pole claw portions 5a are alternately protruded.

Reference numeral 8 denotes a fixed excitation side iron core disposed with a full near gap between the rotor iron core 4 and the other magnetic pole iron core 7, and 9 denotes this iron core 8.
The excitation coil held at VC, 10, is a stator core, and the stator coil 11t is held in the slot. 12 supports the rotating shaft l via a bearing 14, and also supports the stator core 10.
The front bracket connects and supports the cooling air outlet hole 12-
5 are provided. Reference numeral 18 denotes a rear bracket that connects and supports the stator core 1O, which supports the rotating shaft 1 via a bearing 15i, securely supports the core 8, and is provided with an inlet hole 113a for cooling air. 16 is a rectifier that converts the alternating current power generated by the stator coil 11 into direct current power; 17 is a voltage regulator that detects the generator voltage, controls excitation and flow, and adjusts the terminal voltage to a predetermined value; and 18 is fixed to the rotating shaft l. I am a fan.

In the conventional device described above, the rotating shaft l is rotated by the rotation of the engine of the vehicle via the belt. As a result, the AC voltage induced in the stator coil 11 is adjusted to a predetermined value by the voltage regulator 17, and the rectified DC power is supplied to the exciting coil 9 and supplied to a load such as a storage battery.

On the other hand, cooling air is sucked in from the inlet hole 18a of the rear bracket 13 by the rotation of the fan 18, cools the inside of the machine, is drawn out from the outlet hole 12a of the front platen 12, and is discharged by the fan 18. [Problems] In the conventional vehicle alternator as described above, the fan 18
The cooling effect is insufficient, the fan 18 is large and noisy, and there are problems in that the insulation deteriorates due to the ventilation of outside air.

Furthermore, in the case of an increase in output, 77 in.
8 became even larger, leading to problems such as increased windage loss and increased noise.

This invention was made to solve these problems, and it is an AC power generator for vehicles that uses a highly effective cooling means without relying on ventilation cooling by a fan, is smaller and lighter, and eliminates the loss and noise caused by the fan. The purpose is to take advantage of the opportunity.

[Means for solving problems]

In the vehicle alternator according to this invention, the stator coil end g is enclosed in a metal enclosure via a fully insulated filling, and the circumferential distance is between the back of the enclosure and the inner wall of the front and rear plackets. A complete flow path is formed in the direction to allow the cooling liquid to flow,
Are there recesses in the front and rear brackets that allow coolant to flow near the front and rear bearings? In addition, a cooling cover is attached to the outer end of the rear bracket, a branch flow passage is formed between the two, a rectifier and a voltage regulator are attached to the outer end surface of this cooling cover, and the cooling liquid is branched to the branch flow passage. It was made available for distribution.

[Effect]

In this invention, the stator coil and stator core are effectively cooled by the circulation of the cooling liquid, and the crab flow device and voltage regulator are cooled through the cooling cover, and the insides of the recesses formed in the front and rear brackets are cooled. Each bearing is cooled by the circulating coolant, and the excitation coil is cooled via the flowing in-machine air or the excitation side iron core.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a vehicle alternator according to the present invention, and FIG. 2 is a partially cutaway front view of FIG. 1. 7a, 9-11,
14 to 17 are the same as those of the conventional device. 2) is a rotor in which a plurality of magnetic pole claws 22a are spaced apart from each other in the circumferential direction on one magnetic pole iron core 22 fixed to the rotating shaft l;
The magnetic pole claw portions 7a are arranged alternately.

A fixed excitation core 28 is disposed between the one and the other magnetic pole cores 22 and 7 with an air gap therebetween, and holds the excitation coil 9. 24 is a surface coil *1 of the stator coil 11
The enclosing body (1) consists of 11 pairs of enclosures made of a metal material such as aluminum with good thermal conductivity, and an insulating filler 25 made of synthetic resin or the like is filled between the ends of the coils and the stator core 10 is liquid-tight. The stator coil 11 is fixed to the stator coil 11 and protects the stator coil 11 in a liquid-tight manner. A plurality of circumferential radiation fins 241) are provided on the back surface of the enclosure 24. or,
A front side portion 114o of the enclosure 24 extends from the end of the coil toward the rotation axis I, and the end portion 1a is fitted in an annular groove 14a provided in the bearing 14.

27 is an enclosure 2 inside the annular tIA 14a of the bearing 14.
A gas get that liquid-tightly seals the end portion 24a of 4, and is made of a viscous silicon-based material. Reference numeral 26 denotes a front bracket that fully supports the stator core 10. A cooling fluid flow path 82a is formed in the circumferential direction between the inner wall, the back surface of the enclosure 24, and the front side 240. A liquid inflow pipe 28 and an outflow pipe 29 are provided, and a partition gab is provided between them and the back surface of the enclosure 24 in the open position. 85 is a tube connected to the inflow pipe 28 from the outgoing side of the coolant circulation system of the vehicle engine, and 86 is a tube connected to the outflow pipe 29 and returned to the return side of the coolant circulation system. Reference numeral 30 designates a rear bracket that is liquid-tightly connected to the front bracket 26 via a screw 81, and is fitted into the annular groove 30a with the cylindrical protrusions 24a and 24f of the enclosure 24, and is sealed liquid-tightly with a viscous gasket 27. ing.

The rear platen 30 fixes the excitation side iron core 23 and supports the bearing 15, and is provided with a cooling liquid branch hole 30c and a return hole aOa. back platen) 30
A coolant flow passage 32)) is formed in the radial direction between the inner wall of the cooling liquid and the back surface of the rear enclosure 24, and a partition portion 8013 is provided to partition the inflow side and the outflow side. 8oe
is an annular recess formed near the outer periphery of the rear bearing 15 mounting portion in 3G (rear platen), and communicates with the flow passage agb.

Reference numeral 33 denotes a cooling cover made of a metal material with good thermal conductivity and attached to the outer end of the rear bracket 30 in a liquid-tight manner, with a branch flow path Ha for the coolant formed between the two, and cooling from the branch hole 80C. The liquid is circulated and returned to the middle of the flow path agb from the return hole aod force. A plurality of radiation fins 38a are provided on the inner surface of the cooling cover 38 in the direction of flow of the cooling liquid. A strainer 16 is fixed to the outer end surface of the cooling cover 88 via a heat sink 1lla, and a pressure A strainer 17 is fixed via a heat sink 17t)'i. 34 is a protective cover housed in the rear bracket 30.

The cooling effect of the device of the above embodiment is as follows. A portion of the low-temperature coolant of the vehicle's engine is flowed out and flows into the inlet pipe 28 into the flow path 1N! a, 82b f Flows as shown by the arrow, stator core 10. The stator coil 11 is cooled and its temperature rises, and the stator coil 11 is discharged from the outflow pipe 29 and returned to the return side of the coolant circulation system of the engine.

Further, a part of the cooling liquid that has flowed into the flow passage 82b from the inflow pipe 28 flows through the branch flow passage 82c from the branch hole aob as shown by the arrow, and cools the rectifier 16 and voltage regulator 17 via the cooling cover 88. , and returned to the middle of the flow path 82b.

In addition, the front bearing 14 (front platen) 2B is effectively directly cooled by the cooling fluid through the annular recess 26a-f.
is endothermically cooled, and the rear placket 3o has an annular recess 30eQ.
The rear bearing 15 is endothermically cooled through the excitation side iron core 28, and the excitation coil 9 is endothermically cooled through the excitation side iron core 28.

The enclosure body 24 is provided with radiation fins 241), and the cooling cover 38 is provided with radiation fins 88a, thereby increasing heat exchange and further improving the cooling effect.

In this way, the stator coil 11. which generates a large amount of heat. Rectifier 16
．． The voltage regulator 17 and the excitation coil 9 are effectively cooled and the temperature rise is significantly suppressed, and the fan is not made of metal.
That ventilation noise can be eliminated.

FIG. 3 is a longitudinal sectional view showing an embodiment of a pond for a vehicle alternator according to the present invention. The rotor 41 consists of one and the other magnetic pole cores 42 and 48 fixed to the rotating shaft l, and an excitation coil 9 held by these. A plurality of magnetic pole claw portions 48a extending from 48 are arranged alternately. 14
is a slip ring that energizes the excitation coil 9, and iλ current is collected by the brush device 45. A cooling cover 46 is liquid-tightly attached to the rear platter 80, forming a branch flow passage 82a, and a rectifier 16 and a voltage regulator 17 are attached to the cooling cover 47. 47 is a protective cover.

The front and rear platens) 26.80 are directly cooled by the cooling liquid, effectively exchanging heat with the internal air, and therefore the rotor 4
Due to the flow of internal air due to the rotation of one part, heat can be efficiently radiated from the excitation coil 9.

In addition, in the above embodiment, a portion of the coolant was flowed from the coolant circulation system of the engine to the generator, but the present invention is not limited to this.
A separate system of cooling liquid circulation means may be provided.

〔Effect of the invention〕

As described above, according to the present invention, both coil ends of the stator coil are surrounded by a metal concave body through an insulating resin optical fiber material, and a metal concave body is formed between the inner walls of the front and rear brackets and the back surface of the enclosure body. In addition, the front and rear brackets are each provided with recesses that allow the coolant to flow through the circumferential flow passages near the front and rear bearing mounting portions, and the rear bracket and the cooling cover attached thereto. A part of the cooling liquid is branched and distributed through the branch flow passage formed between the cooling covers, and a rectifier and a voltage regulator are attached to the outer end surface of this cooling cover, so the heat generating part is effectively cooled and the size and weight can be reduced. , the noise and damage caused by ventilation, which was the case in the past, are eliminated, and since it is completely closed,
This prevents deterioration of insulation due to outside air and damage caused by harmful gases and salt damage.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a vehicle alternator according to the present invention;
FIG. 2 is a partially cutaway front view of the device shown in FIG. 1 excluding the protective cover, FIG. 8 is a longitudinal cross-sectional view of a vehicle alternator showing another embodiment of the present invention, and FIG. FIG. 2 is a longitudinal cross-sectional view of a conventional vehicular alternator. 1--one rotating shaft, 7--magnetic pole iron core, 9□-excitation coil, 10-"-stator iron core, 11--one stator film, 1
4.15--1 bearing, 1B-11 crab flow device, -17---
Voltage regulator, 2)-m-rotor, 22-m-magnetic pole iron core,
24--1 enclosure body, 241) ---1 heat dissipation fin, 2
5---Insulating filler, 26---Front bracket, IJ
la---recess, R7---gas grip, aO--partial bracket, 30a--circular groove, 80e---recess, 32a, 31---flow passage, 32cm-one branch flow passage, 83- m-cooling cover, 133a--radiating fin, 41--rotor, 42, 48-m-magnetic pole iron core, 4
6 - Cooling cover Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (4)

[Claims] (1) A rotor magnetic pole core that is fixed to the rotating shaft rotated by the vehicle engine and excited by an excitation coil, a stator core that surrounds this pole core and has a stator coil attached to it, and supports this stator core. In addition, in a vehicle alternator equipped with a front bracket and a rear bracket that support the rotating shaft through front and rear bearings, a rectifier, and a voltage regulator, both coil ends of the stator coil are connected. A pair of metal enclosures on both sides are liquid-tightly enclosed through an insulating filler, the inner part of which is liquid-tightly connected to the outer end of one of the enclosures, and a circle is formed between the inner wall and the back of this enclosure. a front bracket having a concave portion in which a cooling fluid flow passage is formed in the circumferential direction and for allowing the cooling fluid to flow near the front bearing; A cooling fluid flow path is formed in the circumferential direction between the housing and the housing,
and a rear bracket with a concave portion for circulating cooling fluid near the rear bearing, and a rear bracket that is fluid-tightly attached to the outer end of the rear bracket, and a branch flow passage formed between the two from the flow passage of the rear bracket. A vehicular alternator comprising a cooling cover that branches and distributes a cooling liquid and has the rectifier and voltage regulator fixed to the outer end surface. (2) The vehicular alternator according to claim 1, wherein a part of the coolant is diverted from the coolant circulation system of the engine and distributed to the flow path. (3) The vehicular alternator according to claim 1 or 2, wherein a radiation fin is provided on the back surface of the enclosure. (4) The vehicular alternator according to any one of claims 1 to 3, wherein radiation fins are provided on the branch flow path side of the cooling cover.