JPH05137295A - Cooling structure of ac generator for vehicle - Google Patents

Abstract

PURPOSE:To efficiently cool by allowing a partition protruding stripe opposed to a peripheral edge of a disclike partition plate having a vent hole to be fixed to a shaft between two rotors through a spacer via a small air gap to protrude from the inner periphery of a center bracket. CONSTITUTION:Rotors 2, 2a are fixed to a rotary shaft 1 through spacers 8a, 8b. A disclike partition plate 13 having a plurality of vent holes 14 is fixed to the shaft 1 through spacers 8a, 8b. A partition protruding stripe 16 opposed to the peripheral edge of the plate 13 through a small air gap protrudes from the inner periphery of a center bracket 15. A centrifugal fan 9a is rotated by the shaft 1, the atmosphere from a suction hole 15b of the bracket 15 flows along the stripe 16 and the plate 13 and is discharged at 15a through the holes 14. The atmosphere from a suction hole 10b is fed between an armature core 6 and a revolving field pole 3, discharged at 15a through the holes 14 of the plate 13, and the air from the hole 11b is discharged at 15a between the armature core 6a and the revolving field pole 3a. Thus, it is efficiently cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC generator mounted on a vehicle for charging a storage battery, and more particularly to a cooling structure thereof.

[0002]

2. Description of the Related Art FIG. 6 shows, for example, Japanese Patent Laid-Open No. 58-13696.
FIG. 1 is a cross-sectional view of a conventional vehicle alternator shown in Japanese Patent Publication No. 3), in which 1 is a rotating shaft, 2 and 2a.
Are first and second rotors fixed around the rotating shaft 1, 3 and 3a are rotating field poles, 4 and 4a are rotating field windings,
5, 5a are first and second stators, 6, 6a are armature iron cores, 7 and 7a are armature windings, and the first rotor 2, the first stator 3 and the second stator The rotor 2a and the second stator 3a constitute separate generators in the same mother body, and each of them supplies the same voltage output or two systems of different voltage. Is configured. 8 is a spacer inserted between the first and second rotors 2 and 2a, and 9 is a first spacer fixed to the first rotor 2.
Centrifugal fans, 9a and 9b are second and third centrifugal fans fixed to the second rotor 2a, 10 is a front bracket, 10a is an exhaust hole, 10b is an intake hole, 11 is a rear bracket, and 11a is an exhaust. A hole, 11b is an intake hole, 12 is a center bracket, and 12a is an exhaust hole. The arrow a,
b and c show the flow of cooling air.

The conventional vehicle alternator is constructed as described above, and when an exciting current is passed through the field windings 5 and 5a, magnetic flux is generated in the rotating field poles 3 and 3a and the armature cores 6 and 6a. The magnetic flux passes through the rotary shaft 1 and a rotary motion is applied to the rotary shaft 1 by a vehicle engine (not shown) to generate a rotating magnetic field, which generates a voltage in the armature windings 7 and 7a for output. The convection a from the intake hole 10b to the exhaust hole 10a is generated by the centrifugal fan 9 and the convection c from the intake holes 10b, 11b to the exhaust hole 12a is generated by the centrifugal fan 9a.
Further, the centrifugal fan 9b allows the intake hole 11b to be exhausted through the exhaust hole 11b.
A convection b to a is generated, and the inside of the machine is forcibly cooled by these convections.

[0004]

As described above, in the conventional vehicle alternator, the air flow between the first and second rotors 2 and 2a is given by the convection c generated by the rotation of the centrifugal fan 9a. Has been. By the way, since the air flow from the centrifugal fan flows from the inner peripheral direction to the outer peripheral direction of the fan, in the case of the centrifugal fan 9a, air acts so as to flow from the spacer 8 direction to the center bracket 12 direction. However, in the centrifugal fan 9a sandwiched between the first and second rotors 2 and 2a, there is no inflow passage of air in the inner peripheral direction of the fan, and only the air around the fan is agitated, and the There was a problem that only convection was obtained and the cooling efficiency was extremely low.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a vehicle alternator capable of achieving efficient cooling with a simple structure.

[0006]

In a vehicle alternator according to the present invention, a disc-shaped partition plate having a ventilation hole is sandwiched between shafts of a first rotor and a second rotor via a spacer. A partition ridge that holds and faces the peripheral edge of the partition plate through a minute gap is provided on the inner peripheral surface of the center bracket.

Further, the second centrifugal fan of the second rotor is removed, and the folding fan is formed on the disk-shaped partition plate.

Further, an annular plate is attached to the tip of the bent portion of the second centrifugal fan provided on the second rotor, and the peripheral edge of the annular plate is closely opposed to the partition ridge provided on the inner peripheral surface of the center bracket.

[0009]

According to the present invention, the cooling air sucked between the first and second rotors reaches the inside between the two rotors, and the airflow is maintained at a constant flow velocity and smoothly exhausted. Thus, the rotating field pole and the rotating field winding are efficiently cooled.

[0010]

1 to 5 show an embodiment of the present invention. In these drawings, 1 to 12 are exactly the same as the conventional ones.

Embodiment 1. In FIG. 1, reference numerals 8a and 8b denote first and second spacers, 13 inserted between the first and second rotors 2 and 2a, respectively. A disk-shaped partition plate that is fixed and has a plurality of ventilation holes 14 arranged all around the circumference.
An annular partition ridge 1 facing the peripheral edge of 3 through a minute gap
6 is a center bracket having a protrusion.

In the vehicular AC generator configured as described above, when the rotary shaft 1 rotates, the centrifugal fan 9a mounted inside the second rotor 2a rotates, so that the intake hole 15b of the center bracket 15 is rotated. The outside air is sucked from the air, and its convection d ₁ flows in along the partition ridge 16 and the disk-shaped partition plate 13, flows through the ventilation hole 14, and is discharged from the exhaust hole 15a. Further, by the same rotation, the outside air sucked from the intake hole 10b passes between the armature core 6 and the rotating field magnetic pole 3, flows through the ventilation hole 14 of the disk-shaped partition plate 13, and exhausts through the exhaust hole 15a.
A convection d ₂ that flows toward the exhaust hole 15 a is generated, and a convection d ₃ that further flows in from the intake hole 11 b, passes between the armature core 6 a and the rotating field pole 3 a, and is discharged to the exhaust hole 15 a.

Embodiment 2. FIG. 2 shows another form of the disk-shaped partition plate 13, in which a plate piece is left in the ventilation hole 14,
Bend the fan 17 by bending the end in one direction.
Is formed. According to this embodiment, the installation of the centrifugal fan 9a shown in FIG. 1 is omitted. In other words, the structure is so simplified and the production is easy. The action of intake air convection in the machine is the same as in the above embodiment, and efficient cooling can be expected.

Example 3. FIG. 3 shows another form of the disk-shaped partition plate 13. That is, the disk-shaped partition plate 13
The fan 17a is bent in one direction along the outer periphery of the fan 17a to project from the fan 17a, and the effect as a centrifugal fan is added. As a result, the centrifugal fan 9a shown in FIG. 1 can be omitted, and the structure is simplified as in the embodiment shown in FIG. Further, the action of intake convection that occurs inside the machine is the same as in Example 1.2 above.

Example 4. 4 is a centrifugal fan 9a attached to the rotor 2a of the first embodiment shown in FIG. 1 and a fan 1 attached to the disc-shaped partition plate 13 of the second embodiment shown in FIG.
It is a combination of 7. These two fans 9
The combination of a and 17 can be expected to have the effect of increasing the speed of the wind and making the flow smoother.

Embodiment 5. FIG. 5 shows that the annular plate 18 is attached to the tip of the bent portion of the second centrifugal fan 9a provided inside the second rotor 2a, so that the flow of the sucked air is sent further inside. The convection effect of exhausting is obtained, and the cooling effect of the rotating field pole and the rotating field winding is increased.

[0017]

As described above, the present invention has the following advantages.
A partition plate having a ventilation hole is sandwiched and held on an axis between the second rotors, and a peripheral edge of the partition plate is closely opposed to a partition ridge provided on the inner circumference of the center bracket. The partition plate is provided with a folding fan, and the second centrifugal fan is removed. Further, an annular plate is attached to the tip of the bent portion of the second centrifugal fan, and the peripheral edge thereof is closely opposed to the partition ridge provided on the inner circumference of the center bracket. It is possible to maintain a constant wind speed, adjust the air velocity, and attract the air to the inside of the machine, so that efficient forced cooling can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing Embodiment 2 of the present invention.

FIG. 3 is a sectional view showing Embodiment 3 of the present invention.

FIG. 4 is a sectional view showing Embodiment 4 of the present invention.

FIG. 5 is a sectional view showing Embodiment 5 of the present invention.

FIG. 6 is a cross-sectional view showing a conventional vehicle AC generator.

[Explanation of symbols]

 1 rotating shaft 2 1st rotor 2a 2nd rotor 8a 1st spacer 8b 2nd spacer 9, 9a, 9b Centrifugal fan 13 Partition plate 14 Vent hole 15 Center bracket 16 Partition ridge 17, 17a Bent fan

Claims (3)

[Claims] 1. A first and a second rotor fixed around a rotating shaft of an alternator for a vehicle and provided with a centrifugal fan, and fitted around the shaft between the first and the second rotor. First, second
In addition to being equipped with a disk-shaped partition plate that is sandwiched between the spacers and provided with a plurality of ventilation holes, an annular partition ridge is provided on the inner peripheral surface of the center bracket. A cooling structure for a vehicle alternator, characterized in that plate edges are closely opposed to each other. 2. A first rotor with a centrifugal fan fixed around a rotating shaft of an alternator for a vehicle, a second rotor without a centrifugal fan inside, and the first and second rotors. An inner circumference of the center bracket is provided with a disk-shaped partition plate that is sandwiched and supported by first and second spacers that are fitted around an axis between them, and that has a plurality of ventilation holes and a folding fan. A cooling structure for an alternator for a vehicle, characterized in that an annular partition ridge is provided on a surface, and a peripheral edge of the partition plate is closely opposed to the partition ridge. 3. A first rotor, a second rotor fixed around a rotation shaft of an alternator for a vehicle, and a second centrifugal fan provided inside the second rotor, provided at a tip end of a bent portion of the second centrifugal fan. A cooling structure for an alternator for a vehicle, comprising: an annular plate; and a center bracket having an annular partition ridge on an inner peripheral surface thereof, wherein a peripheral edge of the annular plate is closely opposed to the partition ridge.