JPH05308751A - Vehicle alternator - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the cooling function of a tandem rotor type vehicle alternator, aiming at downsizing and high output. [Structure] The magnetic pole rotor R is connected in series in the axial direction of the shaft 1.
1 and R2 are arranged, and the corresponding cores 19 and 21 with the first and second stator coils 20 and 22 are arranged on the brackets 3 and 4, respectively. Fan blades 25 and 26 are arranged on the back surfaces of the pole cores 7 and 13 of the rotors R1 and R2, and a centrifugal fan 17 that also serves as a spacer is arranged between the rotors R1 and R2 so as to rotate integrally with the shaft 1. The rotor R1 is formed with a ventilation hole 31 having an opening at one end facing the fan 17 and penetrating in the axial direction. Ventilation windows 27, 28, 29, 30, at the end and the middle of the bracket so that the ventilation passages A, B, C are formed by the rotation of the fans 17 and 25, 26.
32 is provided. The slip ring 18 is provided outside the bracket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator.

[0002]

2. Description of the Related Art In recent years, an AC generator for a vehicle has been disclosed in, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent No. 157251, an AC generator provided with a tandem rotor has been proposed.

In this type of generator, the first shaft and the second magnetic pole rotor are arranged in series in the axial direction on the same shaft in order to supply alternating current electric power of one axis and two systems, and correspondingly, on the bracket side. The configuration is such that the first and second cores with the stator coil are arranged.

Further, a fan blade is arranged on the back surface of the pole core of each magnetic pole rotor, and a ventilation window is formed near the stator coil on the bracket end surface and the bracket peripheral surface to cool the stator coil and the like of the generator.

[0005]

The higher the cooling function of the generator, the smaller the size and the higher the output can be realized. By the way, the cooling means for providing the fan blades on the magnetic pole rotor like the former is low in cost, but in the case of the tandem rotor type, the outside air introduced from the bracket end surface is the middle portion of the bracket, that is, the first and the second. Between the rotors and the first and second
Since it is difficult to reach between the stator coils of, even if a fan blade (mixed flow fan) is installed on the back side of the pole core facing this intermediate part, the air permeability will be low at this position and the cooling performance of the stator coil and magnetic pole rotor will deteriorate. However, there were still points to be improved in order to achieve compactness and high output.

The present invention has been made in view of the above points, and an object of the first invention is to enhance the cooling function of a tandem rotor type generator of this type to promote miniaturization and high output.

A second object of the present invention is to reduce the size of a vehicle AC generator widely regardless of the presence or absence of a tandem AC generator.

[0008]

In order to achieve the above object, the present invention basically proposes the following problem solving means. In order to facilitate understanding of the contents, the reference numerals used in the embodiment of FIG. 1 will be cited and described for convenience.

That is, the first means for solving the problems is the first and second magnetic pole rotors R1 and R2 arranged in series in the axial direction of the same shaft 1 and the corresponding first and second stators. In a tandem rotor type vehicle alternator including cores 19 and 21 with coils 20 and 22, each pole core pair (7.8), (12.13) in the first and second magnetic pole rotors R1 and R2. ), Fan blades 25 and 26 are arranged on the back surfaces of the pole cores 7 and 13 on the sides facing the brackets 3 and 4, respectively, and
A centrifugal fan 17 is provided between the first and second magnetic pole rotors R1 and R2.
Is arranged so as to be rotatable integrally with the shaft 1, and a ventilation hole 31 is formed through at least one of the first and second magnetic pole rotors R1 and R2 in the axial direction. Has ventilation windows 27, 2 on both end surfaces of the bracket.
9, the position of one of the bracket circumferential surfaces closer to the first stator coil 20 is closer to one of the bracket 3 end surfaces, and the position of the other bracket 4 closer to the second stator coil 22 is closer to the second stator coil 22. A ventilation window 32 is formed at a position near the middle of the second stator coils 20 and 22.

As a second means for solving the problem, in a vehicle AC generator equipped with a magnetic pole rotor, a stator, etc., a slip ring 18 for supplying an exciting current to a field coil of the magnetic pole rotor is provided outside the bracket 4. Is mounted on one end of the shaft 1 of the magnetic pole rotor, and the vicinity of the slip ring 18 of the shaft 1 is supported by the bearing 6 provided on the bracket 4, and the outer diameter of the supported portion of the shaft 1 is the same as the inner diameter of the bearing 6. The collar 34 is press-fitted, and the lead wire 3 of the field coil is inserted into the thickness of the collar 34.
7 is inserted in the axial direction, and one end of the lead wire 37 is connected to the slip ring 18.

[0011]

Operation of the first problem solving means: When the magnetic pole rotors R1 and R2 and the centrifugal fan 17 rotate integrally with the shaft 1, the ventilation passage A is formed by the centrifugal fan effect of the fan blade 25 provided on the back surface of the pole core 7. The outside air that is taken in and introduced from the ventilation window 27 passes through the first stator coil 20 and is discharged from the ventilation window 28 to the outside of the machine.
Due to the centrifugal fan action of the fan blades 26 provided on the back surface of the air duct 3, the ventilation passage B is formed, and the outside air introduced from the ventilation window 29 passes through the first stator coil 22 and the ventilation window 30.
Is discharged from the machine to the outside of the machine, the ventilation passage C is formed by the centrifugal fan action of the centrifugal fan 17 and the cooperation with the ventilation hole 31, and a part of the outside air introduced from the ventilation window 27 is in the rotor (the ventilation hole 31). Through the centrifugal fan 17
A ventilation window 32 is provided between the second stator coils 20 and 22.
Discharged from.

In the above operation, particularly in the present invention, the ventilation passage C is formed also in the middle of the first and second rotors R1 and R2 and the stator coils 20 and 22 where it is difficult to form a smooth ventilation passage in the related art. Since the outside air is smoothly introduced with the stator coils 20, 22 and the cores 19, 2
Since the whole 1 is cooled to every corner, the generator cooling function is greatly improved.

Operation of the second means for solving the problem: By placing the slip ring 18 on the outside of the bracket, the axial length of the bracket can be shortened and the size can be reduced. Since the rotor and the collar can be integrally attached to the shaft, the lead wire 37 of the field rotor and the slip ring 18 can be connected after the bracket is assembled.

[0014]

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

FIG. 1 shows a vehicle 2 according to an embodiment of the present invention.
FIG. 2 is a side view of a first magnetic pole rotor used in the above embodiment, FIG. 3A is a front view of a spacer / centrifugal fan used in the above embodiment, and FIG. 4) is a sectional view taken along the line TT, and FIG. 4 is a detailed explanatory view of the slip ring mounting structure of the above embodiment.

In FIG. 1, the shaft 1 is a bracket 3
And the bracket 4, and is supported by bearings 5 and 6 attached to these brackets.

A stator core 19 with a first stator coil 20 is fixed between the brackets 3 and 4, and a stator core 21 with a second stator coil 22 is fixedly arranged on the inner circumference of the bracket 4. These first and second cores with a stator coil are arranged in different stages, and the stator coils 20 and 22 are arranged so as to partially overlap with each other, so that space is rationalized.

The shaft 1 has a tandem rotor R1,
R2 is the first stator core 19 and the second stator core 2
Corresponding to No. 1, they are arranged inside these cores while maintaining a minute gap. The rotors R1 and R2 of the present embodiment adopt a Randle pole type magnetic pole system. Among them, the first rotor R1 has a pair of pole cores 7 and 8 and a magnet piece 9 between them, and a bobbin 10 on this piece 9. It is composed of a field coil 11 fitted through. The second rotor R2 is composed of a pair of pole cores 12 and 13, a magnet piece 14 between them, and a field coil 16 fitted to the piece 14 via a bobbin 15.

When an exciting current (DC current) is supplied to the field coils 16 and 11 via the brush 23 and the slip ring 18, the pole cores 7, 8 and 12, 13 are alternately arranged in the circumferential direction N, N. Form a south pole.

A spacer 17 with a fan blade 17a is interposed in the shaft 1 at an intermediate position between the rotors R1 and R2 so as to rotate integrally with the shaft 1. The spacer 17 serves as an element (centrifugal fan) for accurately maintaining the distance between the first and second rotors R1 and R2 and forming an air passage C described later.

One end of the shaft 1 projects from the bracket 3 and a pulley 2 is fixedly attached thereto. The pulley 2 is connected to a crankshaft of the engine through a V belt (not shown), and the power of the engine is transmitted to the shaft 1. Is done. As the rotors R1 and R2 rotate in synchronization with the rotation of the shaft 1, the stator coils 20,
Different three-phase AC powers are induced in each 22.

A slip ring 18 is arranged at the other end of the shaft 1 protruding from the bracket 4 side. Reference numeral 23 is a brush holder, and 24 is a full-wave rectifier diode. The induced three-phase alternating current is converted into direct current by the full-wave rectifying diode 24 and supplied to the external addition.

FIG. 6 shows an electrical connection diagram. In FIG.
The Zener diode is used as the full-wave rectifier diode 24 in order to limit the voltage of the dump surge so that a high voltage is not applied to the outside. The capacitors C1 and C2 prevent radio noise and the like from being emitted to the outside, and are housed within the chain double-dashed line in FIG.

The terminals indicated by single circles in the constant voltage adjusting circuit 40 indicate the current collecting rings of the slip ring 18,
The exciting currents of the field coils 16 and 11 are controlled to adjust the output voltage to be constant.

Here, the generator cooling structure will be described.

In the first and second rotors R1 and R2, fan blades 25, which function as centrifugal fans, are provided on the back surfaces of the pole cores 7 and 13 near the end surfaces of the brackets 3 and 4, respectively.
26 is provided. Further, as described above, the centrifugal fan 17 exists between the first and second rotors R1 and R2.

The first rotor R1 is provided with a plurality of vent holes 31 penetrating the pole cores 7, 8 and the magnet piece 9 in the axial direction at intervals in the circumferential direction.
Is arranged so that its one end opening faces the centrifugal fan 17.

On the other hand, the brackets 3 and 4 are provided with ventilation windows 27 and 29 on both end faces of the brackets, and the first of the bracket circumferential faces is closer to one end face of the bracket 3.
A position close to the stator coil 20 and a position close to the second stator coil 22 near the other end face of the bracket 4.
A ventilation window 32 is formed at a position close to the middle of the first and second stator coils 20 and 22.

With this structure, the ventilation passages A, B, and C are formed as described in the section of the operation of the invention, and it is difficult to form a smooth ventilation passage in the related art. Rotor R1, R2 intermediate and stator coil 2
Since the outside air is smoothly introduced into the middle of 0 and 22, the entire stator coils 20 and 22 and the cores 19 and 21 are cooled to every corner, and the rotor is also effectively cooled. As a result, the cooling function of the generator is greatly improved, which promotes miniaturization and higher output of the generator.

Next, details of the slip ring portion will be described with reference to FIGS.

One end of the shaft 1 on the slip ring mounting side has a diameter slightly smaller than that of the remaining shaft portion, and this small diameter portion extends to a shaft supported portion supported by the bearing 6 and is external to this supported portion. The collar 34 having the same diameter as the inner diameter of the bearing 6 is press-fitted. In this embodiment, the collar 34 is formed of a metal hollow cylinder, and a plurality of (three in this case) lead wire insertion holes 34a are formed in the thickness thereof.
And the field coils 16 and 11 are inserted in the insertion holes 34a.
Each lead wire 37 (here, there is a total of three wires because one of + and − serves as a common terminal) is covered with an insulating tube 38 and is passed therethrough.

Further, an insulating cylinder (color) 18 'with a slip ring 18 is press-fitted into one end of the shaft 1. The collar 18 'and the collar 34 are arranged close to each other, and the lead wire 37 is soldered 40 to the corresponding slip ring side conductor 39 outside the bracket 4, respectively.
The field coils 11 and 16 and the slip ring 18 are electrically connected.

In such a slip ring structure, after the collar 34 is press-fitted into the shaft 1, the shaft is inserted into the bearing 6 of the bracket 4, and the brackets 3, 4 are inserted.
Collar 18 'with slip ring 18 after assembling each other
Is press-fitted to one end of the shaft to connect the slip ring 18 and the lead wire 37, which can simplify the assembly of the generator. Further, since the total length of the bracket (generator housing) can be shortened, the generator can be downsized.

[0034]

According to the present invention, in the first means for solving the problems, by improving the cooling performance of the generator at a low cost, it is possible to easily achieve high output and downsizing of the tandem rotor type vehicle alternator. Can be achieved. In the second problem solving means, the vehicle AC generator can be downsized and the assembling can be simplified.

[Brief description of drawings]

FIG. 1 is a vertical sectional view according to an embodiment of the present invention.

FIG. 2 is a side view of a first magnetic pole rotor used in the above embodiment.

FIG. 3 is a front view of a spacer / centrifugal fan used in the above embodiment and a sectional view taken along the line TT thereof.

FIG. 4 is a detailed explanatory view of a slip ring mounting structure of the above embodiment.

FIG. 5 is a cross-sectional view of a collar with a lead wire according to the above embodiment.

FIG. 6 is an electric circuit diagram of a generator used in the above embodiment.

[Explanation of symbols]

1 ... Shaft, 3, 4 ... Bracket, 5, 6 ... Bearing, 7, 8 ... Pole core pair, 11 ... Field coil, 12,
13 ... Pole core pair, 16 ... Field coil, 17 ... Spacer / centrifugal fan, 18 ... Slip ring, 19, 21 ...
1st, 2nd stator core, 20, 22 ... 1st, 2nd stator coils, 25, 26 ... Fan blades, 27,
28, 29, 30, 32 ... Ventilation window, 31 ... Vent hole, 37
... Lead wires, R1, R2 ... First and second magnetic pole rotors.

Claims (4)

[Claims] 1. A first magnetic pole rotor and a second magnetic pole rotor arranged in series in the axial direction of the same shaft, and first and second corresponding magnetic pole rotors.
A tandem rotor type vehicle alternator including a second core with a stator coil, wherein a fan is provided on each of the pole core pairs of the first and second magnetic pole rotors on the back side of the pole core on the side facing the bracket end surface. A blade is provided, and the first,
A centrifugal fan is disposed between the second magnetic pole rotors so as to rotate integrally with the shaft, and at least one of the first and second magnetic pole rotors has a vent hole penetratingly formed in the axial direction. In the bracket, ventilation windows are provided on both end surfaces of the bracket, and one of the bracket circumferential surfaces is closer to the first stator coil on one bracket end surface side and the other on the other bracket end surface side is the second stator side. A vehicular AC generator, characterized in that ventilation windows are formed at a position near the coil and a position near the middle of the first and second stator coils. 2. The centrifugal fan according to claim 1,
An alternator for a vehicle, which also functions as a spacer for maintaining a space between the first and second magnetic pole rotors. 3. The magnetic field of the first and second magnetic pole rotors according to claim 1 or 2, wherein the first and second stator coils are arranged in different steps so that a part thereof overlaps each other. A vehicular AC generator, wherein a slip ring for supplying an exciting current to the coil is arranged at one end of the shaft outside the bracket. 4. In a vehicle alternator including a magnetic pole rotor, a core with a stator coil, etc., a slip ring for supplying an exciting current to a field coil of the magnetic pole rotor is attached to one end of a shaft of the magnetic pole rotor outside the bracket. And, the vicinity of the slip ring of the shaft is supported by the bearing provided on the bracket, and the collar having the outer diameter equal to the inner diameter of the bearing is press-fitted into the supported portion of the shaft so that the thickness of the collar is increased. A vehicular AC generator, wherein a lead wire of the field coil is axially inserted, and one end of the lead wire is connected to the slip ring.