JPH07303342A - Power generator - Google Patents

Abstract

PURPOSE:To provide an alternator fitting device which can reduce the deformation of and noise from a housing and stator which occur when an alternator is fixed to an engine with bolts and, at the same time, can prevent the deterioration of the durability of the alternator and the rise of the manufacturing cost. CONSTITUTION:An annular spacer 63 having a thickness matching to the clearance required for fitting an alternator 2 to an engine-side bracket 49 and engine- side adjusting bar 52 is put between the fitting surface of the bar 52 and the surface of the alternator 2 to which an adjusting bar-side stay 55 is fitted and fixed by tightening bolts 62 on the adjust bar 52 side. Therefore, the clearance is absorbed by the spacer 63 and the deformation of the housing 5 and stator 4 of the alternator 2 can be prevented. In addition, magnetic sounds can be prevented from increasing from the case where only the alternator 2 is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator such as an AC generator or a DC generator which receives rotary power from a drive source to generate electric power, and is used as an alternator for charging a battery mounted on a vehicle, for example. Related to a vehicle alternator.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for quieter vehicles, and the demand for noise reduction of vehicle parts has become remarkable. Particularly, in the AC generator for vehicles, there is an urgent need to reduce the magnetic noise generated in the power generation function as one of the factors that generate noise. Note that the magnetic sound is unique when a load current flows through the armature winding, and the Lorentz force acts as an exciting force between the rotor and the stator based on the magnetic flux change in the air gap due to the armature reaction. It is known that this is caused by the vibration of the stator, the frame, etc.

Therefore, conventionally, the surface of the claw-shaped magnetic pole portion of the Lundell-type rotor has been optimized, or the air gap between the rotor and the stator has been increased, for example. A technique for reducing abrupt magnetic flux between a stator and a stator to reduce an exciting force, and as a result, a magnetic sound (for example, Japanese Patent Publication No. 61-11066 and Japanese Patent Publication No. 6-6).
3-49467, JP-A-5-56615, etc.) are well known.

[0004]

As in the prior art, no matter how the magnetic sound level of the generator body is improved, it is integrated with the housing of the generator body when the generator body is attached to the engine. There is a clearance between the molded bracket side stay end surface and the engine side bracket end surface, or between the adjust bar side stay end surface and the engine side adjust bar end surface that are integrally molded on the frame of the generator body. Since it is forcibly tightened and fixed with bolts etc. as it is, distortion occurs in the generator body.

In particular, the frame of the generator main body is distorted and deformed, and even the stator and other parts fixed by the frame are also deformed to deteriorate the durability of the vehicle alternator. There was a point. Further, due to the deformation of the stator, the circularity of the inner circumference of the stator core changes, the air gap between the rotor and the stator changes, and the magnetostriction is amplified. There was a problem that the magnetic sound became very loud compared to the time and was heard as an annoying abnormal sound (noise) in the low speed range where the engine speed was relatively low.

Here, FIG. 7 shows the clearance L (= L2
8 is a comparison diagram of the magnetic sound level of the vehicle alternator in the actual vehicle when -L1) is 0 mm and 1.5 mm.
It is a comparison diagram of the magnetic sound level with respect to the clearance L (= L2-L1) in the actual vehicle. In addition, L1 is a mounting dimension of the bracket side stay of the generator main body (alternator) as shown in FIG. Further, L2 is the mounting dimension of the engine side bracket as shown in FIG. As can be seen from the comparison diagram of FIG. 7, it can be seen that there is a large difference of about 10 dB in the low speed range where noise is most likely to be heard.
Further, as can be confirmed from the comparison diagram of FIG. 8, as the clearance L increases, the magnetic sound level deteriorates and becomes annoying.

Here, conventionally, as shown in FIG.
The alternator main body (generator main body) 100 in which the annular elastic members 114 to 116 are assembled and fixed in advance to the bracket side stays 111 and 112 and the adjust bar side stay 113, the bolts 101 and 102, and the nut 10.
There has been a technique in which fastening tools such as 3, 104 and washers 105 to 107 are used to fasten and attach to the engine side bracket 201 and the engine side adjust bar 202.

In this conventional technique, the vibration of the engine is absorbed by the elastic members 114 to 116, so that there is an advantage that it is difficult to transmit it to the alternator main body 100, but as described above, the mounting dimension L2 of the engine side bracket 201 is set. When assembled, all the elastic members 114 to 116 are tilted and distorted.

As a result, the engine side bracket 201
Since the alternator main body 100 is attached to be inclined, the tension of the belt for transmitting the rotational power of the engine is largely applied to a part thereof, the groove portion of the V-ribbed pulley 117 is worn, and the bearings 118, 1
There is a problem that the shaft 120 rattles with respect to 19 and the life of the bearings 118 and 119 is shortened.

Further, the mounting structure of the alternator main body 100 shown in FIG. 9 is very complicated, and there is also a dimensional error in assembling and fixing the elastic members 114 to 116 to the bracket side stays 111 and 112 and the adjust bar side stay 113 of the alternator main body 100. There is also a problem that the product is large and more easily tilted, and the assembly man-hours are increased, resulting in a large increase in product cost.

The present invention includes at least two first and second
It is an object of the present invention to provide a generator capable of reducing the deformation and noise of the generator main body by mounting it on the support means and preventing the durability of the generator main body from decreasing and the product cost from increasing.

[0012]

According to a first aspect of the present invention, there is provided a rotor which rotates integrally with a rotary shaft, a stator arranged to face the outer periphery of the rotor, and a holding and fixing means for holding the stator. Holding part, and at least two first and second supported parts that are provided radially outward from the holding part and that are provided with a first mounting dimension parallel to the axial direction of the rotating shaft. A main body of a generator that receives rotational power to generate electric power, and is provided with a second mounting dimension parallel to the axial direction of the rotating shaft with an axial length different from the first mounting dimension, Further, at least two first and second supporting means provided to face the first and second supported portions in a direction parallel to the axial direction of the rotation shaft, and at least the second supporting means. It is provided between a supporting means and the second supported portion, and the first mounting dimension and the second mounting dimension are provided. Absorbing means having substantially the same thickness as the dimension difference from the attached dimensions, first fixing means for fixing the first supported portion to the first supporting means, the second supporting means, and the second The technical means including the second fixing means for fastening and fixing the second supported portion to the second supporting means in a state where the absorbing means is sandwiched between the second supported portion and the supported portion.

According to a second aspect of the present invention, in the generator according to the first aspect, the second fixing means inserts a bolt hole formed in the second supporting means, and the generator is A fastening tool such as a bolt that is screwed into a screw hole formed in the second supported portion of the main body, wherein the absorbing means is made of an iron-based material or an elastic material, and the insertion hole into which the fastening tool can be inserted. The technical means of being a spacer having is adopted. According to a third aspect of the invention, in the power generator according to the second aspect, the elastic material is technical means made of a hard spring material or a hard rubber material. Claim 4
The invention according to claim 1 is the generator according to claim 1 or 2, wherein the absorbing means is a surface of the second supported portion of the generator body facing the second supporting means, or The technical means integrally provided on the surface of the second support means facing the second supported portion of the generator body is adopted.

According to a fifth aspect of the present invention, a rotor that rotates integrally with a rotary shaft, a stator that is arranged so as to face the outer circumference of the rotor, a holding portion that holds and holds the stator, and the holding portion. At least two first and second supported portions, which extend radially outward from the portion and are separated by a first mounting dimension parallel to the axial direction of the rotating shaft, and at least one of these. A generator main body that has an insertion hole provided in the second supported portion and that receives rotational power to generate power, and is parallel to the axial direction of the rotating shaft with an axial length different from the first mounting dimension. At least two first mounting portions provided with a second mounting dimension separated from each other and facing the first and second supported portions in a direction parallel to the axial direction of the rotating shaft, The second support means is movably fitted to the second support means to be movable in the insertion hole. The first supporting means to the first supporting means and the absorbing means having a through hole parallel to the axial direction of the rotating shaft and having one side abutting the second supporting means. The first fixing means for fixing, one locking portion for locking the second supporting means, and the other locking portion for locking the other side of the absorbing means are provided, and the absorbing means is penetrated. A technical means including a second fixing means for fastening and fixing the absorbing means to the second supporting means in a state of penetrating the hole is adopted.

[0015]

According to the first aspect of the invention, the first fixing means fixes the first supported portion of the generator body to the first supporting means, and the second supporting means and the generator. With the absorbing means sandwiched between the second supported portion of the main body,
The second support means clamps and fixes the second supported portion of the generator body to the second support means. As a result, the first mounting dimension of the generator main body and the second mounting of the first and second supporting means are
Since the dimensional difference from the mounting size is absorbed by the presence of the absorbing means, there is no gap between the second supporting means and the second supported portion. Therefore, by the second fixing means, the second
Even if the second supported portion is tightened and fixed to the supporting means, the holding portion of the generator body is not distorted, and the deformation of the stator and other parts held and fixed by the holding portion is suppressed.

According to the fifth aspect of the invention, by fixing the first supported portion of the generator body to the first supporting means by the first fixing means, the generator body is Axial positioning is performed. Further, the absorbing means is fitted into the insertion hole of at least the second supported portion of the generator body, and the second supporting means is secured by the one locking portion of the second fixing means which penetrates the through hole of the absorbing means. In the state of being locked and the other side of the absorbing means being locked by the other locking portion of the second fixing means, the second supporting means supports the second supported member of the generator main body by the second supporting means. The generator main body is positioned in the rotational direction of the rotating shaft by tightening and fixing the parts. Therefore, even when the second supported portion is fastened and fixed to the second supporting means by the second fixing means, the first mounting dimension of the generator main body and the second mounting of the first and second supporting means are fixed. Since the generator main body can be fixed to the first and second supporting means in a state in which the size difference from the size is maintained, the holding portion of the generator main body is not distorted, and is fixedly held by the holding portion. Deformation of the child and other parts is suppressed.

[0017]

Next, a description will be given based on a plurality of embodiments in which the AC generator of the present invention is applied to an alternator as an AC generator for vehicles such as automobiles.

[Structure of First Embodiment] FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a view showing an alternator mounting device, and FIG. 2 shows a single structure of the alternator. It is the figure shown. This alternator mounting device 1 is
A generator mounting device for mounting the alternator 2 on a vehicle body or a supporting means such as an engine E for traveling, which is installed in an engine room (not shown) of the vehicle.

The alternator 2 is the generator main body of the present invention, and comprises a rotor 3, a stator 4 and a housing 5. The rotor 3 is a part that acts as a field,
It rotates integrally with the shaft 6. The rotor 3 includes a Landel type pole core (field iron core) 7, a field winding (field coil) 9, two slip rings 10, and the like. A V-ribbed pulley 11 for transmitting the rotational power of the engine E to the shaft 6 is attached to one end of the shaft 6. The V-ribbed pulley 11 is connected to a pulley (not shown) mounted on the output shaft of the engine E via a connecting means (not shown) such as a belt.

A field winding 9 is wound in the center of the pole core 7, and when an exciting current flows through the field winding 9, the claw-shaped magnetic pole portion 12 is formed.
Are all N poles, and the claw-shaped magnetic pole portions 13 are all S poles.
Further, cooling fans 14 and 15 for sucking cooling air into the housing 5 are integrally attached to the respective end surfaces of the claw-shaped magnetic pole portions 12 and 13. Two slip rings 10
Is attached to the outer periphery of the other end of the shaft 6,
The outer circumference of each of the brushes 16 is in sliding contact with the brush 16.

The stator 4 is provided with an armature core 17 arranged on the outer periphery of the pole core 7 so as to face it, and this armature core 17.
It is composed of a three-phase armature winding 18 wound around the. The armature core 17 is formed by laminating a plurality of thin plates made of magnetic material, and is press-fitted into the inner periphery of the housing 5 to be integrated. Further, the armature iron core 17 is configured such that the magnetic fluxes emitted from the claw-shaped magnetic pole portions 12 and 13 of the pole core 7 have three-phase armature windings 18.
To form a magnetic flux path that is designed to effectively intersect with.
A large number of slots (not shown) are formed at equal intervals on the inner peripheral side of the armature core 17. The three-phase armature windings 18 are connected by Y connection or Δ connection, and a three-phase AC output is induced as the rotor 3 rotates.

The housing 5 is the holding portion of the present invention and is composed of a drive frame 21, a rear frame 22 and a rear cover 23. The drive frame 21 and the rear frame 22 hold and fix the rotor 3 and the stator 4, and at the same time, are attached to the engine E.

Further, the drive frame 21 and the rear frame 22 are directly joined by fastening tools such as a plurality of stud bolts 24 and a plurality of nuts 25. The drive frame 21 and the rear frame 22 are provided with a large number of holes 26, 27 for venting cooling air sucked by the rotation of the cooling fans 14, 15. The shaft 6 is rotatably supported on the inner circumferences of the drive frame 21 and the rear frame 22 via bearings 28 and 29.

Further, the rear frame 22 and the rear cover 23
A brush 16, a rectifying device 31, an output terminal (not shown), and the like are attached between and. The rectifying device 3 is provided between the rear frame 22 and the rear cover 23.
1, the brush holder 32, the IC regulator 33, etc. are assembled by means of screws or the like. The rectifier 31 is
It is a collection of a plurality of diodes (not shown) and converts (rectifies) an alternating current into a direct current. The rectifying device 31 is electrically connected to an electric load and a battery (neither shown) mounted on the vehicle.

The brush holder 32 houses and holds the brush 16. The IC regulator 33 turns on and off a switching element (not shown) such as a transistor placed between the field winding 9 and ground (not shown) to turn on an exciting current flowing through the field winding 9. The output voltage of the alternator 2 is controlled to be constant.

Next, the structure of the alternator mounting device 1 will be described.
This will be described in detail with reference to FIGS. 1 to 3. Here, FIG. 3 is a view showing the alternator mounting portion 40 of the engine E. The engine E also serves as a drive source for rotationally driving the alternator 2 and an alternator mounting portion 40 for mounting the alternator 2 on a vehicle such as an automobile. The alternator mounting portion 40 is a generator mounting means and is composed of a lower support member 41 and an upper support member 42 for supporting and fixing the alternator 2, which are bolts 4
It is fastened and fixed to the body of the engine E by fastening tools such as 3, 44 and washers 45, 46.

The lower support member 41 has a projecting portion 47 projecting laterally from the body of the engine E, and the projecting portion 4
7, an engine-side bracket 48 extending upward from the front-side upper end portion along the outer wall surface of the body, and an engine-side bracket extending from the rear-side upper end portion of the protruding portion 47 in the same direction as the engine-side bracket 48. 49 is integrally molded.

The engine side bracket 48 has a circular insertion hole 48a. The insertion hole 48a is formed in a direction parallel to the axial direction of the shaft 6 and penetrates the outer surface and the mounting surface of the engine side bracket 48. Also,
A cylindrical slide bush 50 is fitted into the insertion hole 48a so as to be movable in the direction of the center line of the insertion hole 48a. The slide bush 50 is a bracket side bolt 6
1, a circular bolt hole 50a through which 1 can be inserted is formed.

The engine side bracket 49 is the first supporting means of the present invention and has a screw hole 49a into which the bracket side bolt 61 is screwed. This screw hole 49a
Are formed in a direction parallel to the axial direction of the shaft 6 and penetrate the outer surface and the mounting surface of the engine side bracket 49.

The upper support member 42 hangs downward along the outer wall surface of the body from the protruding portion 51 protruding laterally from the body of the engine E and the lower end portion on the front side of the protruding portion 51. The engine side adjust bar 52 is integrally molded. The engine side adjusting bar 52 is the second supporting means of the present invention, and is separated from the mounting surface of the engine side bracket 49 by a second mounting dimension L2 (see FIG. 3) parallel to the axial direction of the shaft 6. Is provided.

Further, the adjusting bar 52 on the engine side
In order to adjust the belt tension or the like for transmitting the rotational power of the engine E to the alternator 2, an arc-shaped elongated hole 52a that allows the alternator 2 to rotate with the bracket side bolt 61 as a fulcrum is formed. ing.
The adjustment bar side bolt 62 can be inserted into the elongated hole 52a and is formed in a direction parallel to the axial direction of the shaft 6. The long hole 52a penetrates the outer surface and the mounting surface of the engine side adjustment bar 52.

The drive frame 21 of the alternator 2 is integrally formed with a bracket-side stay 53 which is attached so as to face the mounting surface of the engine-side bracket 48, which is fixed by a fastener such as a bolt or welded by brazing. It is joined by means. The bracket-side stay 53 extends from the outer peripheral surface of the drive frame 21 outward in the radial direction of the shaft 6 (downward in the drawing), and has a circular bolt hole 53a through which the bracket-side bolt 61 can be inserted. .

A bracket side stay 54, which is attached to the mounting surface of the engine side bracket 49 so as to face the mounting surface of the engine side bracket 49, is integrally formed with the rear frame 22 and is fixed by a fastening tool such as a bolt, or joined by welding means such as brazing. Has been done. The bracket-side stay 54 is the first supported portion of the present invention, extends from the outer peripheral surface of the rear frame 22 in the same direction as the bracket-side stay 53, and has a circular shape through which the bracket-side bolt 61 can be inserted. Bolt holes 54a are formed.

These bolt holes 53a and 54a are formed in a direction parallel to the axial direction of the shaft 6 and on the same axis. Further, the bolt holes 53a and 54a are provided on the mounting surface of the engine side bracket 48 and the mounting surface of the bracket side stay 53 and the mounting surface of the engine side bracket 49 which are fastened and fixed by the bracket side bolt 61 via the slide bush 50. The bracket-side stay 54, which is directly tightened and fixed by the side bolt 61, penetrates the surface to which the bracket-side stay 54 is attached.

Further, the drive frame 21 of the alternator 2 is integrally formed with an adjust bar side stay 55 which is mounted so as to face the mounting surface of the engine side adjust bar 52, and is tightened and fixed by a tightening tool such as a bolt or brazed. Are joined by welding means. The adjust bar side stay 55 is the second supported portion of the present invention, and extends from the outer peripheral surface of the drive frame 21 toward the radially outer side (upward in the drawing) of the shaft 6. The attached surface of the adjust bar side stay 55 of the alternator 2 is parallel to the attached surface of the bracket side stay 54 in the axial direction of the shaft 6 and is in the same direction as the second attachment dimension L2. Mounting dimension L1 (see Figure 2)
Are separated from each other.

Further, the adjust bar side stay 55 is
A circular screw hole 55a through which the adjust bar side bolt 62 can be inserted is formed. The screw hole 55a is in a direction parallel to the axial direction of the shaft 6, that is, the bolt hole 53a,
It is formed in a direction parallel to 54a. Also, screw holes 5
5a penetrates the attached surface and the inner side surface of the adjust bar side stay 55 which is tightened and fixed by the adjust bar side bolt 62 via the spacer 63 to the mounting surface of the engine side adjust bar 52.

The bracket side bolt 61 is the first bolt of the present invention.
A hexagonal head portion 61a as a locking portion that locks the slide bush 50 via a circular plate-shaped washer 64, a rod-shaped shaft portion 61b extended from the head portion 61a, And a threaded portion 61c formed on the tip end side or substantially the whole of the shaft portion 61b.

The shaft portion 61 of the bracket side bolt 61
b penetrates the bolt hole 50a of the slide bush 50, the bolt hole 53a of the bracket side stay 53, and the bolt hole 54a of the bracket side stay 54. The screw portion 61 c of the bracket side bolt 61 is screwed into the screw hole 49 a of the engine side bracket 49. Further, in this example, the tightening tool is composed of the bracket side bolt 61 and the washer 64.

The adjust bar side bolt 62 is the second fixing means of the present invention, and is a hexagonal part as a locking portion for locking the outer side surface of the engine side adjust bar 52 via the washer 65 having an annular plate shape. -Shaped head portion 62a, rod-shaped shaft portion 62b extended from this head portion 62a, and this shaft portion 62b
Has a threaded portion 62c formed on the front end side or substantially the whole thereof.

The shaft portion 62b of the adjusting bar side bolt 62 is provided with the elongated hole 52 of the engine side adjusting bar 52.
a, through the bolt hole 63a of the spacer 63. Further, the screw portion 62c of the adjust bar side bolt 62 is screwed into the screw hole 55a of the adjust bar side stay 55.
In this example, the tightening tool is composed of the adjust bar side bolt 62 and the washer 65.

The spacer 63 is the absorbing means of the present invention, and is made of an iron material (for example, a washer) or an elastic material (for example, hard rubber, a wave washer) or the like, and the first mounting dimension L1 of the alternator 2 is provided. And the second mounting dimension L2 of the engine E (= clearance)
It is an annular plate-shaped annular body having a thickness corresponding to L (for example, 0.5 mm to 10 mm). The shape of the spacer 63 is not limited to this embodiment, but may be an arc shape,
You can freely change the design such as elliptical shape, oval shape, polygonal shape.

A circular bolt hole 6 into which the adjusting bar side bolt 62 can be inserted is formed inside the spacer 63.
3a is formed. The spacer 63 is clamped between the mounting surface of the engine side adjusting bar 52 and the mounting surface of the adjusting bar side stay 55 by tightening the engine side adjusting bar 52 and the adjusting bar side stay 55 with the adjusting bar side bolt 62. Thus, it functions as a clearance absorbing material that absorbs a gap (clearance) between the mounting surface of the engine side adjust bar 52 and the mounted surface of the adjust bar side stay 55.

[Mounting Method of First Embodiment] Next, a mounting method of the alternator 2 of this embodiment will be briefly described with reference to FIGS. 1 to 3. When mounting the alternator 2 on the alternator mounting portion 40 of the engine E, first, the bracket side stay 53 and the bracket side stay 54 of the alternator 2 are inserted between the slide bush 50 and the engine side bracket 49.

Then, the slide bush 50, the bracket side stay 53, the bracket side stay 54, and the engine side bracket 49 are tightened with the bracket side bolts 61 via the washers 64, whereby the alternator 2
The mounted surface of the bracket-side stay 53 is fixed to the mounting surface of the engine-side bracket 49 without a clearance.

Next, the belt is provided with a pulley (not shown) of the output shaft of the engine E and the V-ribbed pulley 11 of the alternator 2.
And the adjustment bar side stay 55 of the alternator 2 at the position where a predetermined tension is applied to the belt by using the elongated hole 52a of the engine side adjustment bar 52.
The surface to be attached of is opposed to.

At this time, in order to facilitate the mounting of the engine E to the alternator mounting portion 40, the clearance L (= L2) is larger in the second mounting dimension L2 of the engine E than in the first mounting dimension L1 of the alternator 2. -L1). That is, the dimensional difference between the first mounting dimension L1 and the second mounting dimension L2 is L2-L1> 0, and between the mounting surface of the engine side adjusting bar 52 and the mounted surface of the adjusting bar side stay 55. Clearance L
If the adjust bar side bolt 62 is forcibly tightened while the (gap) is generated, the drive frame 21 and the rear frame 22 of the alternator 2 are distorted and deformed.

In view of this, in this embodiment, the clearance L is taken into consideration in advance, and the drive frame 21 is tightened and fixed.
In order to substantially suppress the deformation of the rear frame 22 and the rear frame 22, a spacer 63 having substantially the same thickness as the clearance L is sandwiched between the mounting surface of the engine side adjusting bar 52 and the mounting surface of the adjusting bar side stay 55. , They faced each other.

Then, the engine side adjust bar 52 and the adjust bar side stay 55 are tightened with the adjust bar side bolt 62 via the washer 65, so that the surface to which the adjust bar side stay 55 of the alternator 2 is attached via the spacer 63. It is fixed to the mounting surface of the engine side adjust bar 52.

As a result, the alternator 2 is tightened and fixed to the mounting surface of the engine side bracket 49 of the lower support member 41 on the lower side in the drawing by the bracket side bolts 61, and the engine side adjust bar 52 of the upper support member 42 on the upper side in the drawing. The shaft 6 is positioned in the axial direction and the shaft 6 is positioned in the rotational direction by tightening and fixing the adjustment bar side bolt 62 to the mounting surface of the shaft 6.
Therefore, the alternator 2 can be attached to the alternator attaching portion 40 of the engine E without increasing the assembling work.

[Operation of First Embodiment] Next, the operation of the alternator 2 of this embodiment will be briefly described with reference to FIGS. 1 to 3. The rotational power of the engine E is V via the belt.
When transmitted to the ribbed pulley 11, the shaft 6 rotates to rotate the rotor 3. Then, a voltage is applied to the field winding 9 from the battery and an exciting current flows through the field winding 9, whereby the claw-shaped magnetic pole portions 12, 13 of the pole core 7 are formed.
Is excited. As a result, all the claw-shaped magnetic pole portions 12 become the N pole and all the claw-shaped magnetic pole portions 13 become the S pole.

Then, a rotating magnetic field is generated in the armature core 17 of the stator 4 which rotates relative to the rotor 3, and an alternating current is induced in the three-phase armature winding 18. This three-phase alternating current is converted into a direct current by the rectifying device 31, charges the battery, and supplies electric power to the electric load of the vehicle.

[Effects of the First Embodiment] As described above, when the alternator 2 is mounted on the alternator mounting portion 40 of the engine E, the spacer 63 is mounted on the adjusting bar side stay 55 of the alternator 2 and the engine side. The adjusting bar 52 is inserted and assembled between the mounting surface and the mounting surface. As a result, the clearance L is absorbed and deformation of the housing 5 such as the drive frame 21 and the rear frame 22 of the alternator 2 due to the tightening of the adjust bar side bolt 62 can be suppressed. As a result, it is possible to prevent deformation of the stator 4 that is press-fitted into the inner periphery of the housing 5 and integrated, so that the life of the alternator 2 can be extended.

Further, by preventing the stator 4 from being deformed, the circularity of the inner circumference of the armature core 17 does not change, and the rotor 3
Since the air gap between the outer circumference of the pole core 7 and the inner circumference of the armature core 17 of the stator 4 does not change, magnetic distortion does not occur, and a magnetic noise that is more offensive than when the alternator 2 is used alone is generated. There is no worry of increasing. As a result, even if the alternator 2 is attached to the engine E, the magnetostriction is not amplified, and the surface of the claw-shaped magnetic pole portions 12 and 13 of the pole core 7 is optimized and the air gap is enlarged. By reducing the magnetic sound level when the alternator 2 is used alone, it is possible to dramatically reduce annoying abnormal noise (noise) even in a low speed range where the engine speed is relatively low.

Further, even when the alternator 2 is attached to the alternator attaching portion 40 of the engine E by using the spacer 63, the alternator 2 is not attached to the engine side brackets 48, 49 and the adjusting side stay 52 in an inclined manner. . As a result, it is possible to prevent the tension of the belt for transmitting the rotational power of the engine from being unevenly applied, so that the groove portion of the V-ribbed pulley 11 is worn,
It is possible to prevent the durability of the alternator 2 from being deteriorated by shortening the life of the bearings 28 and 29 due to the rattling of the shaft 6 with respect to the bearings 28 and 29.

Further, for example, the above-mentioned various effects can be obtained only by adding the spacer 63 to the conventional alternator, so that the number of assembling steps for assembling the alternator 2 to the alternator mounting portion 40 of the engine E is increased. Therefore, it is possible to suppress an increase in the product cost of the alternator mounting device including the alternator 2 and the alternator mounting portion 40, particularly the alternator 2.

[Second Embodiment] FIG. 4 shows a second embodiment of the present invention and is a view showing the structure of an alternator main body. In this embodiment, the annular plate-shaped spacer 71 made of an iron-based material is attached to the surface to which the adjust bar side stay 55 formed on the drive frame 21 of the alternator 2 is attached by an adhesive method or brazing. Using various joining methods such as welding and welding, the engine E
Pre-bonded before mounting on. The spacer 71 is formed with a circular bolt hole 71a through which the adjusting bar side bolt 62 can be inserted.

[Third Embodiment] FIG. 5 shows the third embodiment of the present invention and is a view showing the structure of an alternator main body. In this embodiment, an annular plate-shaped spacer 72 made of an iron-based material or a resin material is bonded to an embedded portion 73 such as a recess formed on the mounting surface of the adjust bar side stay 55 of the alternator 2. It is buried before being attached to the engine E by using a bonding method such as an agent or a welding method such as brazing or welding.

The spacer 72 is formed with a circular bolt hole 72a through which the adjusting bar side bolt 62 can be inserted. Further, the embedded portion 7 is provided in the spacer 72.
An annular plate-shaped buried portion 72b that is embedded in the inner peripheral portion 3 and an annular plate-shaped absorbing portion 72c in which the engine-side adjust bar 52 protrudes from the embedded portion 73 are integrally formed.
The thickness of the absorbing portion 72c corresponds to a dimensional difference (= clearance) L between the first mounting dimension L1 of the alternator 2 and the second mounting dimension L2 of the engine E.

[Structure of Fourth Embodiment] FIG. 6 shows a fourth embodiment of the present invention and is a view showing an alternator mounting device. The lower support member 41 of this embodiment extends the engine-side bracket 74 upward from the upper end portion of the center of the protrusion 47 along the outer wall surface of the body of the engine E.

On the mounting surface on the front side (left side in the drawing) of the engine side bracket 74, the mounting surface of the bracket side stay 75 as the first supported portion formed on the drive frame 21 of the alternator 2 is the first mounting surface. It is directly tightened and fixed by a bracket side bolt 77 as a fixing means. Further, the mounting surface of the bracket side stay 76 formed on the rear frame 22 of the alternator 2 is fastened to the mounting surface of the engine side bracket 74 on the rear side (on the right side in the drawing) by the bracket side bolt 77 via the slide bush 78. It is fixed.

The engine side bracket 74, the bracket side stay 75 and the slide bush 78 are formed with bolt holes (not shown) through which the shaft portions (not shown) of the bracket side bolts 77 are inserted. Bracket side stay 7
A through hole (not shown) in which the slide bush 78 can be moved is formed in 6.

The head 77a of the bracket side bolt 77 is
It functions as one locking portion that locks the outer surface of the bracket side stay 75 via the washer 79. Further, the tip end side of the shaft portion or substantially the entire threaded portion 77 c is screwed into the nut 80. Then, the nut 80 functions as the other locking portion that locks the rear end surface of the slide bush 78 via the washer 81.

On the mounting surface of the engine side adjust bar 52 of the upper side support member 42 of the engine E, the adjust bar side stay 82 as the second supported portion formed on the drive frame 21 of the alternator 2 is mounted. Surface is slide bush 84 by adjusting bar side bolt 83
It is fixed by tightening through. The adjust bar side stay 82 is formed with an insertion hole 82a through which the slide bush 84 can move. In addition, the slide bush 84
The absorbing means of the present invention is a cylindrical tubular body having bolt holes 84a as through-holes for inserting the shaft portions 83b of the adjusting bar side bolts 83 as the second fixing means.

Head portion 83a of the adjusting bar side bolt 83
Serves as one locking portion that locks the outer surface of the engine side adjustment bar 52 via the washer 85. Also,
Screw part 8 formed on the tip side or substantially the entire shaft part 83b
3c is screwed onto the nut 86. And nut 86
Serves as the other locking portion that locks the rear end surface of the slide bush 84 via the washer 87.

[Mounting Method of Fourth Embodiment] Next, a mounting method of the alternator 2 of this embodiment will be briefly described with reference to FIG. When mounting the alternator 2 on the alternator mounting portion 40 of the engine E, first, with the slide bush 78 fitted in the insertion hole of the bracket side stay 76, the brackets of the alternator 2 are attached to the mounting surfaces on both sides of the engine side bracket 74. The mounting surface of the side stay 75 and the mounting surface of the bracket side stay 76 are opposed to each other.

Then, the bracket side stay 75, the engine side bracket 74, the bracket side stay 76, and the slide bush 78 are tightened with the bracket side bolts 77 via the washers 79 and 81, whereby the bracket side stay 75 of the alternator 2 is attached. The surface is fixed to the front mounting surface of the engine side bracket 74 without any clearance.

Then, in the same manner as in the first embodiment, the belt is stretched between the pulley (not shown) of the output shaft of the engine E and the V-ribbed pulley 11 of the alternator 2 to lengthen the length of the engine side adjusting bar 52. By using the hole 52a, the alternator 2 is arranged at a position where a predetermined tension is applied to the belt. Then, with the slide bush 84 fitted in the insertion hole 82a, the mounting surface of the engine side adjust bar 52 and the mounted surface of the adjust bar side stay 82 of the alternator 2 are arranged to face each other.

Then, the engine side adjusting bar 52 and the slide bush 84 are tightened with the adjusting bar side bolts 83 via the washers 85 and 87, whereby the surface to which the adjusting bar side stay 55 of the alternator 2 is attached and the engine side adjusting bar 52. The mounting surface is fixed with the clearance L maintained. This allows
The alternator 2 is positioned in the axial direction of the shaft 6 by being tightened and fixed to the mounting surfaces on both sides of the engine side bracket 74 of the lower support member 41 on the lower side in the drawing by the bracket side bolts 77. Further, the shaft 6 is positioned in the rotational direction by being tightened and fixed to the mounting surface of the engine side adjust bar 52 of the upper side support member 42 on the upper side in the drawing with the adjust bar side bolt 83.

[Effects of the Fourth Embodiment] As described above, in the alternator 2 of this embodiment, the mounting surface of the adjust bar side stay 82 of the alternator 2 is the mounting surface of the engine side adjust bar 52 of the upper support member 42. On the other hand, the movement of the shaft 6 in the axial direction and the rotation direction is restricted while maintaining the clearance L.

As a result, in the housing 5 such as the drive frame 21 and the rear frame 22 of the alternator 2, since a large tightening force is not forcibly applied in the direction parallel to the axial direction of the shaft 6, the housing 5 is not distorted. The deformation of the housing 5 is suppressed. Thus, by preventing the stator 4 from being deformed, the inner circularity of the armature core 17 does not change, and the outer circumference of the pole core 7 of the rotor 3 and the inner circumference of the armature core 17 of the stator 4 are not changed. Since the air gap between them will not change, no magnetostriction will occur,
It can suppress annoying magnetic noise.

[Modification] In the second and third embodiments, the spacers 71, 72 are integrally provided in advance on the mounting surface of the adjust bar side stay 55 of the alternator 2, but the spacers 71, 72 are mounted. It may be integrally provided on the surface in advance.

In this embodiment, the present invention is applied to the alternator 2 as an AC generator for a vehicle, but the present invention is applied to other AC generators that are rotationally driven by a drive source such as an electric motor, an internal combustion engine, a water turbine, a wind turbine, etc. It may be applied to the machine. Further, the present invention may be used in a DC generator.

In this embodiment, the engine-side brackets 49 and 74 and the engine-side adjust bar 52, which are fastened and fixed to the engine E, are used as the first and second supporting means, but as the first and second supporting means. Alternator mounting means (generator mounting means) for drive sources other than the engine, vehicle body, etc.
May be used. In addition, the first and second supported portions and the first and second
Two or more second support means may be provided for each.

[0074]

According to the invention described in claims 1 and 5, even if the generator main body is fastened and fixed to the second support means by the second fixing means, the generator main body is axially arranged in the axial direction of the rotating shaft. Since a large tightening force is not forcibly applied, distortion does not occur in the generator body. In particular, since the holding portion connected to the first and second supported portions is not distorted, the holding portion for holding and fixing the stator is prevented from being deformed, and the stator and other parts can be prevented from being deformed. As a result, the change in the circularity of the inner circumference of the stator is reduced, and the change in the air gap between the outer circumference of the rotor and the inner circumference of the stator is reduced. You can Further, since the deformation of the generator body can be prevented, the durability of the generator body can be improved, and the effect of reducing the magnetic noise can be obtained only by providing the absorbing means, which can prevent an increase in the number of assembly steps. It is possible to prevent a significant increase in product cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing an alternator mounting device used in a first embodiment of the present invention.

FIG. 2 is a sectional view showing a unitary structure of the alternator of FIG.

3 is a front view showing an alternator mounting portion of the engine of FIG. 1. FIG.

FIG. 4 is a sectional view showing a unitary structure of an alternator used in a second embodiment of the present invention.

FIG. 5 is a sectional view showing a unitary structure of an alternator used in a third embodiment of the present invention.

FIG. 6 is a sectional view showing an alternator mounting device used in a fourth embodiment of the present invention.

FIG. 7 is a comparative diagram showing a relationship among a magnetic sound level, an alternator rotation speed, and an engine rotation speed.

FIG. 8 is a comparative diagram showing a relationship between a magnetic sound level and a clearance.

FIG. 9 is a sectional view showing an alternator mounting device as a conventional technique.

[Explanation of symbols]

E Engine 1 Alternator mounting device 2 Alternator (generator body) 3 Rotor 4 Stator 5 Housing (holding part) 6 Shaft (rotating shaft) 18 Armature winding 21 Drive frame 22 Rear frame 49 Engine side bracket (first Support means 52 Engine side adjust bar (second support means) 54 Bracket side stay (first supported portion) 55 Adjust bar side stay (second supported portion) 61 Bracket side bolt (first fixing means) , Tightening tool) 62 Adjust bar side bolt (second fixing means, tightening tool) 63 Spacer (absorbing means)

Claims (5)

[Claims] (A) A rotor that rotates integrally with a rotating shaft, a stator that is arranged so as to face the outer circumference of the rotor, a holding portion that holds and fixes the stator, and a diameter from the holding portion. The first direction extending outward in the direction parallel to the axial direction of the rotary shaft.
At least two firsts, which are spaced apart by the mounting dimension of
A generator main body having a second supported portion and receiving rotational power to generate electric power; and (b) a second main body having an axial length different from the first mounting dimension and parallel to the axial direction of the rotating shaft. Of the at least two first and second portions, which are provided to be separated from each other by the mounting dimension, and which face the first and second supported portions in a direction parallel to the axial direction of the rotating shaft. Support means, and (c) is provided at least between the second support means and the second supported portion, and has the first mounting dimension and the second
(D) first fixing means for fixing the first supported portion to the first supporting means, and (e) the second absorbing means. Second fixing means for clamping and fixing the second supported portion to the second supporting means with the absorbing means sandwiched between the supporting means and the second supported portion. Generator. 2. The generator according to claim 1, wherein the second fixing means inserts a bolt hole formed in the second supporting means, and the second supported member of the generator main body. It is a tightening tool such as a bolt screwed into a screw hole formed in the portion, wherein the absorbing means is a spacer formed of an iron-based material or an elastic material and having a through hole into which the tightening tool can be inserted. Characteristic generator. 3. The generator according to claim 2, wherein the elastic material is made of a hard spring material or a hard rubber material. 4. The generator according to claim 1 or 2, wherein the absorbing means is a surface of a second supported portion of the generator body facing the second supporting means, or the second supporting means. A generator integrally provided on a surface of the second supporting means facing the second supported portion of the generator body. 5. (a) A rotor that rotates integrally with a rotary shaft, a stator that is arranged so as to face the outer periphery of the rotor, a holding portion that holds and holds the stator, and a radial direction from the holding portion. At least two first and second supported parts that are extended outward and are provided with a first mounting dimension parallel to the axial direction of the rotating shaft, and at least a second supported part of them. A generator main body that has an insertion hole provided in the support portion and that receives rotational power to generate electric power; and (b) is parallel to the axial direction of the rotary shaft with an axial length different from the first mounting dimension. At least two first and second portions, which are provided with a second mounting dimension therebetween and are opposed to the first and second supported portions in a direction parallel to the axial direction of the rotation shaft. And (c) the second supported portion that is movably fitted in the insertion hole. An absorbing means that has a through hole that is through and one side abuts on the second supporting means and that is parallel to the axial direction of the rotating shaft; and (d) the first supported portion on the first supporting means. And (e) one locking portion for locking the second supporting means, and the other locking portion for locking the other side of the absorbing means. In a state where it penetrates through the through hole of the absorbing means, the second
A second fixing means for clamping and fixing the absorbing means to the supporting means of FIG.