JPH05268752A - Ac generator for vehicle - Google Patents

Abstract

PURPOSE:To enhance withstandingness against high speed rotation by mounting a second rotor and a second stator on the shaft of a first generating section, comprising a combination of first rotor and stator, projecting from the rear end of bearing on the opposite side to a pulley. CONSTITUTION:A first rotor 3 is secured to a shaft 2 between a first bearing 5 and a second bearing 6 and a first stator 4 is arranged on the outer periphery thereof thus constituting a first generating section. The shaft 2 is projected oppositely to the first rotor 3 of the second bearing 6 and a second rotor 9 is secured to the projected part and then a second stator 10, generating an AC voltage different from that of the first stator 4, is arranged on the outer peripheral side through a small air gap thus constituting a second generating section. According to the constitution, a bearing span identical to that of a single system power supply generator is provided and vibration of shaft of an AC generator for vehicle, to which power can be fed from two power supplies, can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator mounted on a vehicle and driven by an internal combustion engine for supplying alternating current power to two electric systems to a plurality of electric devices requiring two voltages. Regarding the machine.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 1-157251 is known as a generator that supplies power from two systems by one generator. This kind of generator requires two types of rotors that obtain different power sources on the same shaft between a pair of bearings, and two types of stators with the same outer diameter, and the field coil of each rotor must have a current. In order to supply the above, 3 pairs of brushes and slip rings were required even if they shared the ground. Further, a center bracket is interposed between each stator.

Regarding cooling, since the rotors are arranged on the same axis, ventilation resistance between the rotors becomes large, and the field coils cannot be cooled effectively.

As for the high rotation resistance, the bearing span is large, so that the runout of the shaft is large, and the coaxiality of each stator is not accurate as described above, so that the structure has a low limit for high speed rotation.

In addition, the rotor is provided between the pair of bearings.
Being fixed on a long shaft and having a stator of the same diameter between a pair of bearings are difficult to assemble and disassemble and work efficiency is low, which causes high cost. ..

[0006]

In the structure of the prior art described above, since the center bracket is interposed between the two types of stators, the coaxiality is deteriorated and the shaft core is easily tilted, which causes noise to increase. Regarding cooling, since the rotors are arranged on the same axis, the ventilation resistance between the rotors becomes large, and the field coils cannot be cooled effectively.

A first object of the present invention is to make the bearing span the same as that of a power supply generator of one system to suppress shaft runout, reduce noise, and improve high rotation resistance. The purpose of the present invention is to provide a vehicle AC generator capable of supplying the power supply of

A second object of the present invention is to improve the ease of disassembling and assembling the second alternator by mounting the second alternator on the outside of the first alternator in the vehicle alternator.

A third object of the present invention is to prevent the propagation of sound and reduce noise by covering the coil portion of the second stator of the second power generation portion with resin in the vehicle alternator. That is.

A fourth object of the present invention is to fix the fan to the side surface of the second rotor of the second power generating section in the vehicle alternator, and also to fix the third power generating section of the second power generating section.
The cooling is improved by forming fins on the outer peripheral portion of the housing.

A fifth object of the present invention is to eliminate a slip ring and a brush for flowing a field current by using a permanent magnet in the magnetic field generating section of the second power generating section in the vehicle alternator. is there.

[0012]

The first object is to fix the first rotor on the shaft between a pair of bearings,
A first stator is arranged on the outer circumference of the first stator. Further, it is achieved by projecting the end of the shaft on the side opposite to the pulley from the bearing, fixing the second rotor to the projecting portion, and disposing the second stator on the outer periphery thereof.

The second object is achieved by mechanically fixing one side surface of the third housing to a spigot portion provided on an end surface of the second housing on the side opposite to the pulley with a plurality of bolts. To be done.

The above-mentioned third object is achieved by covering the coil portion of the second stator of the second power generation portion with a resin having the effect of preventing vibration and propagating sound.

The fourth object is to fix the fan to the side surface of the second rotor of the second power generation section, and to form fins on the outer peripheral portion of the third housing of the second power generation section. It is achieved by

The above fifth object is achieved by using a permanent magnet for the magnetic field generating section of the second power generating section.

[0017]

Operation: The first combination of the first rotor and the stator
By providing the second rotor and the second stator on the outer periphery of the second rotor on the same shaft of the power generation unit and on the shaft protruding to the rear end of the bearing on the side opposite to the pulley,
The second power generation unit including the second rotor and the stator includes the first
It can be easily attached and detached from the power generation part. As an attachment / detachment method, for the second rotor, a screw is cut on the end portion of the shaft protruding portion, and the second rotor is set on the shaft protruding portion and then fixed with a nut. As for the second stator, the second stator is fixed inside the housing, and the housing is fixed to the housing supporting the first power generation unit with screws or the like.

As described above, since the second power generating section is removable, the second stator having a stator core outer diameter different from the stator core outer diameter of the first stator can be removable according to the capacity of the second power generating section. is there.

By covering the entire second stator with resin, noise can be reduced while ensuring insulation of the second stator.

Regarding cooling, if a fan is fixed to the end surface of the core of the second rotor, the second power generation section can be cooled without impairing the cooling performance of the first power generation section. In addition, if a cooling fin extending in the radial direction is formed in the housing that covers the outer circumference of the stator, the second stator is inevitably and effectively cooled by the cooling air from the fan of the first power generation unit.

With respect to the field of the second rotor, by fixing the field coil to the housing end face of the first power generation section, a brush and a slip ring are not required for the second field coil. Further, if a permanent magnet is used instead of the field coil, the structure can be further simplified.

[0022]

Embodiments of the present invention will be described below with reference to FIGS.

In FIG. 1, an alternator pulley 1 driven by a belt to a crank pulley of an engine.
Are connected to the shaft 2. The first rotor 3 fixed to the shaft 2 is disposed on the outer peripheral side of the first rotor 3 for generating a rotating magnetic field with a minute gap, and is located on both sides of the first stator 4 and the first rotor 3 for generating AC power. A field coil, which is a magnetic field generating portion of the first rotor 3, is interposed between the first bearing 5 and the second bearing 6, which rotatably support the second rotor 6, and the first rotor 3 and the second bearing 6. A first housing 7 and a second housing 8 which have a slip ring and a brush for passing an electric current, have first and second bearings in the center thereof, and support the first stator 4. The portion is the first power generation unit, and the second
The housing 8 has a first AC output terminal for taking out an AC output generated from the first stator 4.

The shaft 2 of the first power generation part is projected to the side of the second bearing 6 opposite to the first rotor 3 of the first rotor 3, and the second rotor 9 for generating a rotating magnetic field is fixed to the projected part with a nut. , A portion formed of a third housing 11 that encloses the outer circumference of the second stator 10 such that the second stator 10 that generates an alternating voltage different from that of the first stator 4 is attached to the outer circumference side of the second stator 10 through a minute gap. , A second power generation unit, and has a second AC output terminal for taking out an AC output generated from the second stator 10 drawn out from the cooling air discharge window of the third housing 11.

By disposing the second power generating section for generating an alternating voltage different from that of the first power generating section on the side surface of the first power generating section on the side opposite to the pulley, the bearing span remains the first power generating section. Therefore, shaft runout can be reduced, noise is reduced, and high rotation resistance is improved. Further, the third housing 11 including the second stator 10 having a stator core outer diameter different from the stator core outer diameter of the first stator 4 according to the capacity of the second power generation unit is configured to be detachable, and replacement work is performed. Will be easier. Further, by sharing the slip ring and the brush of the first power generation unit also in the second power generation unit, the slip ring and the brush of the second power generation unit can be omitted.

FIG. 2 shows an exploded view of the mounting of the third housing 11 of the second power generation section.

The first power generation section and the second power generation section may be attached so that one side surface of the third housing 11 is fixed to the spigot section 12 on the side surface of the second housing 8 by a plurality of bolts. It becomes possible and the assembling work becomes easy.

Further, as shown in FIG. 3, by covering the stator coil portion of the second stator 10 with the resin 13, the insulation of the second stator 10 is ensured and the propagation of the sound is suppressed to reduce the noise. Can be measured.

Regarding the cooling, as shown in FIG.
The fan 14 is fixed to the end surface of the core of the rotor 9. By the rotation of the fan 14, the cooling air is sucked from the cooling air suction window on the end surface of the third housing 11 on the side opposite to the mounting side and the cooling air suction window on the side surface of the second housing 8 to which the third housing 11 is mounted. .. The sucked cooling air flows as shown by the arrow in FIG. 4, and is discharged from the cooling air discharge window provided in the third housing 11 to enable cooling of the second power generation unit. In addition, as shown in FIG. 5, by forming the cooling fins 15 extending in the radial direction in the third housing 11, a fan fixed to the fan of the first power generation section and the core end surface of the second rotor 9 is formed. The cooling wind from 14 effectively cools the second power generation section.

FIG. 6 shows a view seen from the S direction in FIG.

As shown in FIG. 7, the second field coil 16 of the field generator of the second rotor 9 is fixed to the end face of the second housing 8 of the first power generator. Further, the rotor poles forming the N and S poles of the second rotor 9 are fixed by a nonmagnetic ring. As a result, the second rotor 9 serves as an inductor, and the second field coil 16 does not need a brush or a slip ring. Furthermore, as shown in FIG.
If a permanent magnet 17 is used instead of the field coil 16,
Further, the structure can be simplified.

[0032]

According to the present invention, with respect to the first object, in the generator that obtains two different voltages, the second power generation section is
Since the bearing span is the same as that of the first power generation section by being attached to the outside of the power generation section, it is possible to reduce the generation of noise due to the runout of the shaft and to improve the high rotation resistance.

According to the present invention, for the second object, in the generator which obtains two different voltages, the capacity of the second power generation section is increased by mounting the second power generation section on the outside of the first power generation section. Accordingly, there is an effect that the second stator having a stator core outer diameter different from the stator core outer diameter of the first stator can be easily attached and detached, workability can be improved, and cost increase can be prevented.

According to the present invention, for the third object, in the generator for obtaining two different voltages, by covering the stator coil portion of the second stator of the second power generation portion with resin,
This has the effect of reducing noise while ensuring insulation of the second stator.

According to the present invention, for the fourth object, in the generator for obtaining two different voltages, by fixing the fan to the side surface of the second rotor of the second power generation section, Forming fins on the outer periphery of the third housing of the power generation section has the effect of improving cooling.

According to the present invention, for the fifth object, in a generator for obtaining two different voltages, a slip ring for flowing a field current by using a permanent magnet in the magnetic field generating section of the second power generating section. With no brush, the number of parts can be reduced and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of the structure of an automotive alternator showing an embodiment of the present invention.

FIG. 2 is an exploded view of the housing of the second power generator of the vehicle alternator showing the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of a structure in which a stator coil portion of a second power generator of a vehicle AC generator showing an embodiment of the present invention is covered with resin.

FIG. 4 is a cross-sectional view of a main part of a second power generation section of an automotive alternator showing another embodiment of the present invention.

FIG. 5 is a side view of the housing of the second power generator of the vehicle alternator showing the embodiment of the present invention.

FIG. 6 is a view on arrow S in FIG.

FIG. 7 is a cross-sectional view of a main part of a second power generation section of an automotive alternator showing a second embodiment of the present invention.

FIG. 8 is a cross-sectional view of a main part of a second power generation section of an automotive alternator showing a third embodiment of the present invention.

[Explanation of symbols]

1 ... Pulley, 2 ... Shaft, 3 ... First rotor, 4 ... First stator, 5 ... First bearing, 6 ... Second bearing, 7 ... First housing, 8 ... Second housing, 9 ... 2nd rotor, 10 ... 2nd stator, 11 ...
Third housing, 12 ... Inlay part, 13 ... Resin, 1
4 ... fan, 15 ... fin, 16 ... second field coil,
17 ... Permanent magnet.

Claims (10)

[Claims] 1. A first rotor fixed to a shaft for generating a rotating magnetic field, a first stator located on the outer peripheral side of the first rotor for generating an AC output, and both sides of the first rotor. A first bearing and a second bearing that are rotatably supported on the shaft,
A second bearing is enclosed in the center of the second bearing and the first bearing
A first housing and a second housing for supporting the stator of and the first bearing is located on the side opposite to the rotor,
In a vehicular AC generator having a driving force transmission means such as a pulley mechanically fixed to the tip of the shaft, the shaft is made to protrude toward the side opposite to the rotor of the first rotor through the second housing. A second rotor that generates a rotating magnetic field is mechanically fixed to the protruding portion, and a second stator that generates an AC voltage different from that of the first stator is arranged on the outer peripheral side of the rotor. A vehicle alternator. 2. A vehicle alternator according to claim 1, wherein the outer diameter of the first stator and the outer diameter of the second stator are different. 3. The vehicle alternator according to claim 1, wherein the second rotor is pressed and fixed to the shaft. 4. A third housing according to claim 1, further comprising a third housing that encloses an outer circumference of the second stator, wherein one side surface of the third housing is fixed to a side surface of the second housing. AC alternator for vehicles. 5. The vehicle alternator according to claim 1, wherein a spigot portion is provided on a side surface of the second housing. 6. The vehicle alternator according to claim 1, wherein at least a coil portion of the second stator is covered with resin. 7. The vehicle alternator according to claim 4, wherein a plurality of protrusions extending in an outer diameter direction are formed on an outer peripheral portion of the third housing. 8. The vehicle alternator according to claim 1, wherein a fan is fixed to at least one side surface of the second rotor. 9. The vehicle alternator according to claim 1, wherein a field coil for magnetizing the second rotor is fixed to a side surface of the second housing. 10. The vehicle alternator according to claim 1, wherein the rotating magnetic field of the second rotor is a permanent magnet.