JPH0578259B2 - - Google Patents

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 structure as shown in a sectional view in FIG. Reference numeral 1 denotes a rotating shaft to which a pulley 2 is fixed. 3 is a rotor fixed to the rotating shaft 1, and is configured as follows. 4 is a rotor core, 5 is one magnetic pole core, and has a plurality of magnetic pole claws 5a.
are spaced apart in the circumferential direction. 6
7 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; a plurality of magnetic pole claw parts 7a are spaced apart from each other in the circumferential direction; The magnetic pole claw portions 5a are arranged alternately.

Reference numeral 8 denotes a fixed excitation side iron core disposed on the rotor iron core 4 and the other magnetic pole iron core 7 via an air gap;
1 is an excitation coil held by this iron core 8, and 10 is a stator iron core, which holds a stator coil 11 in a slot. Reference numeral 12 denotes a front bracket that supports the rotary shaft 1 via a bearing 14 and also connects and supports the stator core 10, and is provided with an outlet hole 12a for cooling air. A rear bracket 13 connects and supports the stator core 10, supports the rotary shaft 1 via a bearing 15, securely supports the core 8, and is provided with an inlet hole 13a for cooling air. 16 is a rectifier that converts the AC power generated by the stator coil 11 into DC power; 17 is a voltage regulator that detects the generator voltage, controls the excitation current, and adjusts the terminal voltage to a predetermined value; 18
is a fan fixed to the rotating shaft 1.

In the conventional device described above, the rotating shaft 1 is rotated via the belt by the rotation of the vehicle engine. 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, due to the rotation of the fan 18, the rear bracket 1
Cooling air is sucked in through the inlet hole 13a of the front bracket 12, cools the inside of the machine, is drawn out through the outlet hole 12a of the front bracket 12, and is discharged by the fan 18.

[Problem that the invention seeks to solve]

In the conventional vehicle DC generator as described above, cooling is performed by circulating cooling air through the fan 18, and the cooling effect is not sufficient, the fan 18 is large and noisy, and insulation deteriorates due to outside air ventilation. There was a problem.

Furthermore, when the output is increased, the fan 18 becomes larger due to the increase in the amount of cooling air, leading to an increase in windage loss and a problem in that noise also increases.

This invention was made to solve these problems, and uses a highly effective cooling means without using a large diameter fan for ventilation cooling.
The purpose of this invention is to obtain a vehicle alternator that is smaller and lighter and eliminates loss and noise caused by a fan.

[Means for solving problems]

In the vehicle alternator according to the present invention, the ends of the stator coils are surrounded by a synthetic resin enclosure, and the cooling liquid is circulated in the circumferential direction between the back of the enclosure and the inner walls of the front and rear brackets. At the same time, a cooling cover is attached to the outer end of the rear bracket to form a branch flow passage 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 distributed by branching into the branch flow passage. It was designed to do so.

[Effect]

In this invention, the stator coil and stator core are effectively cooled by the flow of cooling fluid, the rectifier and voltage regulator are cooled through the cooling cover, and the bearing is cooled by the cooled front and rear brackets. , the excitation coil is cooled via the flowing cabin air or the excitation side iron core.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a vehicle alternator according to the present invention, and FIG. 2 is a partially cutaway front view of FIG. 7
a, 9 to 11, and 14 to 17 are the same as those in the conventional device. 21 is a rotor, and one excitation core 22 fixed to the rotating shaft 1 has a plurality of magnetic pole claws 2.
2a are spaced apart from each other in the circumferential direction, and extend alternately with the magnetic pole claws 7a.

Reference numeral 23 denotes a fixed excitation side iron core that is disposed on one and the other magnetic pole iron cores 22 and 7 via an air gap, and holds the excitation coil 9. Reference numeral 24 denotes a pair of synthetic resin enclosures on both sides that liquid-tightly surround both coil ends of the stator coil 11, and are molded and sealed with an insulating synthetic resin material. Note that heat dissipation fins may be provided in the circumferential direction on the back surface of this enclosure.

Next, 26 is a front bracket that supports the stator core 10, and the cylindrical protrusion 24a at the end of the enclosure 24 is fitted into the annular groove 26a, and the bracket is liquid-tightly sealed with a gasket 27 made of viscous silicone or the like. A cooling liquid flow path 32a is formed in the circumferential direction between the inner wall and the back surface of the enclosure 24. The front bracket 26 is provided with an inflow pipe 28 and an outflow pipe 29 for cooling fluid, and an enclosure 2 is provided in both directions.
A partition portion 26b is provided between the rear surface of the device and the rear surface of the device. 35 is a tube connected to the inflow pipe 28 from the outgoing side of the coolant circulation system of the vehicle engine, and 36 is a tube connected to the outflow pipe 29 and returned to the return side of the coolant circulation system. 30 is front bracket 26
After being fluid-tightly connected to the bracket through an O-ring 31, the cylindrical protrusion 24a of the enclosure 24 is fitted into the annular groove 30a, and the bracket is fluid-tightly sealed by a viscous gasket 27. The rear bracket 30 fixes the excitation side iron core 23, supports the bearing 15, and has a cooling liquid branch hole 30c and a return hole 30.
d is provided. A radial coolant flow passage 32b is formed between the inner wall of the rear bracket 30 and the back surface of the rear enclosure 24.

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.A branch flow path 32c for the cooling liquid is formed between the two, and cooling is carried out from the branch hole 30c. distribute the liquid,
Return it to the middle of the flow path 32b from the return hole 30d. A plurality of radiation fins 33a are provided on the inner surface of the cooling cover 33 in the direction of flow of the cooling liquid. A rectifier 16 is fixed to the outer end surface of the cooling cover 33 via a heat sink 16a, and a voltage regulator 17 is fixed via a heat sink 17b. 34 is a protective cover attached to the rear bracket 30.

The cooling effect of the device of the above embodiment is as follows. A part of the low-temperature coolant of the engine of the vehicle is flowed and flows into the flow passages 32a and 3 through the inflow pipe 28.
2b as shown by the arrow, cools the stator core 10 and stator coil 11 and raises the temperature, and the outflow pipe 2
9 and returned to the return side of the engine's coolant circulation path.

Further, a part of the cooling liquid that has flowed into the flow passage 32b from the inflow pipe 28 is transferred from the branch hole 30b to the branch flow passage 32b.
2c as shown by the arrow, cools the rectifier 16 and voltage regulator 17 via the cooling cover 33, and returns to the middle of the flow path 32b.

Furthermore, the front bracket 26, which is effectively directly cooled by the cooling fluid, endothermically cools the bearing 14, and the rear bracket 30 endothermically cools the bearing 15.
The excitation coil 9 is endothermically cooled via the excitation side iron core 23.

In this way, the stator coil 11, rectifier 16, voltage regulator 17, and excitation coil 9, which generate a large amount of heat, are effectively cooled, temperature rise is significantly suppressed, and a fan is not required, eliminating ventilation noise. be able to.

The front and rear brackets 26 and 30 are directly cooled by the cooling liquid, and heat is exchanged effectively with the internal air. Therefore, the excitation coil 9 is efficiently radiated with heat due to the flow of internal air caused by the rotation of the rotor 21. I can do it.

In addition, in the above embodiment, a portion of the coolant was flowed from the coolant circulation system of the engine and distributed to the generator.
The present invention is not limited to this, and 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 synthetic resin enclosure, and the circumferential flow path is formed between the inner walls of the front and rear brackets and the back surface of the enclosure. A portion of the coolant is distributed through a branch flow path formed between the rear bracket and a cooling cover attached to the rear bracket, and a rectifier and a voltage regulator are installed on the outer end surface of the cooling cover. Since it is installed, the heat generating part can be effectively cooled, making it smaller and lighter, eliminating noise and wind damage caused by ventilation, and since it is completely closed, there is no need to worry about insulation deterioration due to outside air, harmful gases, salt damage, etc. damage caused by this is prevented.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal 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, and FIG. 3 is a conventional vehicle alternator. FIG. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 7... Magnetic pole core, 9... Excitation coil, 10... Stator core, 11... Stator coil, 14, 15... Bearing, 16... Rectifier, 17
... Voltage regulator, 21 ... Rotor, 22 ... Magnetic pole core, 24 ... Synthetic resin enclosure, 24b ... Heat radiation fin, 26 ... Front bracket, 26a ... Annular groove, 30 ... Rear bracket, 30b... annular groove,
32a, 32b...flow passage, 32c...branch flow passage, 33...cooling cover, 33a...radiation fin, and the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A rotor magnetic pole core that is fixed to a rotating shaft rotated by a vehicle engine and excited by an excitation coil, a stator core that surrounds this magnetic pole core and has a stator coil attached to it, and this fixed In a vehicle alternator comprising a front bracket and a rear bracket that support the child core and the rotating shaft via bearings, a rectifier and a voltage regulator, both coil ends of the stator coil are connected to each other. A pair of synthetic resin enclosures on both sides are liquid-tightly surrounded by an insulating filler, the inner part is liquid-tightly connected to the outer end of one of the enclosures, and a circumference is formed between the back surface and the inner wall of this enclosure. a front bracket having a flow path for cooling fluid in the direction; the inner part thereof is liquid-tightly coupled to the outer end of the other enclosure, and the cooling liquid is disposed in the circumferential direction between the back surface and the inner wall of the enclosure; a rear bracket having a flow passage formed therein;
A vehicular alternator equipped with a cooling cover having the rectifier and voltage regulator fixed to its 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 heat 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 a heat dissipation fin is provided on the branch flow passage side of the cooling cover.