JPH0468851B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle 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;
10 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. On the other hand, an initial excitation current is applied from the storage battery to the excitation coil 9 via the voltage regulator 17, and the excitation side core 8 is passed through two air gaps to the magnetic pole cores 5 and 7, and also to the stator core 10 via the gap. When the rotating shaft 1 rotates, the magnetic pole cores 5 and 7 alternately cross the stator coil 10, so that an alternating magnetic flux passes through the stator coil 11, and an alternating current voltage is applied to the stator coil 11. An outbreak occurs. The AC voltage induced in the stator coil 11 is adjusted to a predetermined value by a voltage regulator 17, and the rectified DC power is supplied to the excitation 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 the circulation of cooling air by 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, in the case of an increase in output, there is a problem in that the fan 18 becomes larger due to the increase in the amount of cooling air, resulting in an increase in windage loss and an increase in noise.

This invention was made in order to solve these problems, and it is an AC power generator for vehicles that uses a highly effective cooling means without using ventilation fans to reduce the size and weight, and eliminates the loss and noise caused by fans. The purpose is to take advantage of the opportunity.

[Means for Solving the Problems] In the vehicle alternator according to the present invention, the end of the stator coil is surrounded by an enclosure, and a circle is formed between the back of the enclosure and the inner walls of the front and rear brackets. A flow passage is formed in the circumferential direction to allow the cooling fluid to flow, and a cooling cover part integrally formed with the rear bracket is provided at the outer end of the rear bracket, and a branch flow passage is formed between them, and this cooling cover A rectifier and a voltage regulator are attached to the outer end surface of the section, and the cooling liquid is distributed through branched flow passages.

[Effect]

In this invention, the stator coil and stator core are effectively cooled by the circulation of the cooling liquid, the rectifier and voltage regulator are cooled through the cooling cover part, and the bearing is cooled by the cooled front and rear brackets. At the same time, the excitation coil is cooled through 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 magnetic pole iron 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 enclosures on both sides surrounding both coil ends of the stator coil 11, which are made of a metal material such as aluminum with good thermal conductivity, and are filled with an insulating filler 25 made of synthetic resin or the like between the coil ends. , are fixed to the stator core 10 in a liquid-tight manner, and protect the stator coil 11 in a liquid-tight manner. A plurality of heat radiation fins 24b are provided on the back surface of the enclosure 24 in the circumferential direction.

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 between the two.
A partition portion 26b is provided between the rear surface of the device and the rear surface of the device. Reference numeral 35 denotes a tube connected from the outgoing side of the coolant circulation system of the vehicle engine to the inflow gap 28, and 36 denotes 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 liquid-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 viscous gasket 27 seals the bracket liquid-tightly. 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 coolant flow path 32b is formed in the radial direction between the inner wall of the rear bracket 30 and the back surface of the rear enclosure 24, and a partition portion 30b is provided to partition the inflow side and the outflow side.

Reference numeral 33 denotes a cooling cover part integrally formed at the outer end of the rear bracket 30, between which a branch flow path 32c for the cooling liquid is formed, and a branch hole 30c.
The cooling liquid is circulated and returned to the middle of the flow path 32b from the return hole 30d. A plurality of heat radiation fins 33 are provided on the inner surface of the cooling lever portion 33 in the flow direction of the cooling liquid.
A is provided. A rectifier 16 is fixed to the outer end surface of the cooling cover section 33 via a heat sink 16a, and a voltage regulator 17 is fixed via a heat sink 17a. 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 30c to the branch flow passage 32b.
2c as shown by the arrow, cools the rectifier 16 and voltage regulator 17 via the cooling cover part 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.

Each enclosure 24 is provided with a heat radiation fin 24b, and the cooling cover portion 33 is provided with a heat radiation fin 33a, thereby increasing heat exchange and improving the cooling effect.

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 the ventilation noise. be able to.

FIG. 3 is a longitudinal sectional view showing another embodiment of the vehicular alternator according to the present invention. The rotor 41 has one and the other magnetic pole cores 42 fixed to the rotating shaft 1.
and 43, and an excitation coil 9 held by these, in which a plurality of magnetic pole claw parts 42a taken out from the magnetic pole iron core 42 and a plurality of magnetic pole claw parts 43a taken out from the magnetic pole iron core 43 are arranged alternately. be. Reference numeral 44 denotes a slip ring that energizes the excitation coil 9, and the current is collected by a brush device 45. A cooling cover section 46 is integrally formed on the rear bracket 30, and a branch flow passage 32c is formed therein.
6 is attached with a rectifier 16 and a voltage regulator 17. 47 is a protective cover.

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 41. I can do it.

In addition, in the above embodiment, part of the coolant was flowed from the coolant circulation system of the engine to circulate the generator.
The present invention is not limited to this, and a separate system of cooling liquid circulation means may be provided. Further, in the above example, the metal enclosure 24 is attached to the outer periphery of the insulating filler 25, but
The metal enclosure 24 is not required and the insulating filler 25
An enclosure may be constructed of a chisel to liquid-tightly cover the stator coil 11 and form a cooling fluid passage.

〔Effect of the invention〕

As described above, according to the present invention, both ends of the stator coil are surrounded by an enclosure, and cooling is carried out in the circumferential flow path formed between the inner walls of the front and rear brackets and the back surface of the enclosure. A part of the cooling liquid is branched and distributed through a branch flow path formed between the rear bracket and a cooling cover part integrally formed therewith, and a rectifier and voltage are installed on the outer end surface of this cooling cover part. Since the regulator is installed, the heat generating part is effectively cooled, making it possible to reduce the size and weight, eliminate the noise and wind damage caused by conventional ventilation, and eliminate the need for cooling with cooling air. There is no need to configure an inlet hole in the rear bracket or an outlet hole in the front bracket for air intake and exhaust, and it can be completely closed, reducing the risk of insulation deterioration due to outside air and damage from harmful gases and salt damage.
By forming the cooling cover integrally with the rear bracket, compared to the case where they are constructed separately, it is possible to use a specially shaped O-ring to make the branch flow passage liquid-tight, and to install the O-ring. Since there is no need to provide a groove, it is possible to provide a structure that is simple and easy to manufacture.

[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 another embodiment of the invention. A longitudinal cross-sectional view of an example vehicle alternator,
FIG. 4 is a longitudinal sectional view of a conventional vehicular alternator. 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 ... Enclosure, 24b ... Heat dissipation fin,
25...Insulating filler, 26...Front bracket,
26a... Annular groove, 30... Rear bracket, 30
a...Annular groove, 32a, 32b...Flow path, 32
c... Branch flow passage, 33... Cooling cover part, 33
a... Heat dissipation fin, 41... Rotor, 42, 43
. . . Magnetic pole iron core, 46 .

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 through bearings, a rectifier and a voltage regulator, both coil ends of the stator coil are connected to each other. A pair of liquid-tight enclosures on both sides, the inner part of which is liquid-tightly connected to the outer end of one of the enclosures, and a cooling liquid flow passage in the circumferential direction between the inner wall and the back surface of the enclosure. a front bracket having a front bracket formed thereon, and a rear bracket having an inner side liquid-tightly connected to an outer end of the other enclosure, and a cooling liquid flow path being formed in a circumferential direction between the inner wall and this enclosure. , and this is integrally formed at the outer end of the rear bracket, the cooling liquid is branched from the flow passage of the rear bracket into the branch flow passage formed between them, and the rectifier and voltage regulator are installed on the outer end surface. A vehicle alternator equipped with a cooling cover section that has a fixed cooling cover. 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 radiation fin is provided on the branch flow passage side of the cooling cover part.