JPH0823660A - Alternator for vehicle - Google Patents

Abstract

PURPOSE:To reduce the magnetic noise without increasing the mass or size of an alternator for a vehicle. CONSTITUTION:Projecting sections 203 and 204 are respectively provided to the connecting sections of a stator core 3 with a front bracket 1 and rear bracket 2 so that the brackets 1 and 2 can be brought into contact with the core 3 in nearly line-contacting states. Although the brackets 1 and 2 are deformed by the axial tension of bolts used for assembling generator, etc., and a bending force is applied to the core 3, the bending force is not transmitted to the core 3 from the brackets 1 and 2, because the brackets 1 and 3 are brought into contact through the projecting sections 203 and 204. Therefore, magnetic noise can be reduced, since the deformation of the core 3 can be suppressed and a uniform clearance can be secured between the stator core 3 and the pole body of a rotor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator mounted on a vehicle such as an automobile, and particularly reduces vibration noise due to magnetic excitation force generated by deformation of a stator and a bracket of the generator. The present invention relates to an alternator for vehicles.

[0002]

2. Description of the Related Art An alternator for a vehicle is constructed by rotating a rotor magnetic pole core, which is excited by an exciting coil supplied with power from a storage battery, in a cylindrical stator core by a driving force of an engine. , A mechanism for generating an induced electromotive force in the stator coil provided in the stator core.

The structure of the stator core and the bracket of the vehicle alternator is disclosed in JP-A-4-351442.

In the vehicle alternator described in the above publication, the stator is arranged so as to be sandwiched between the front bracket and the rear bracket, and bolts are provided in a plurality of bolt screw holes provided on the outer circumferences of the both brackets. It was supported by passing it through and tightening both brackets.
At this time, the stator is deformed due to the concentration of stress due to the tightening of the bolt, which causes a change in the magnetic attraction force generated between the stator and the rotor. The change in the magnetic attractive force acts as a vibrating force on the stator and the rotor, which induces vibration of each part and causes magnetic noise.
Therefore, magnetic noise can be reduced by suppressing the deformation of the stator.

In Japanese Unexamined Patent Publication No. 4-351442, the above-mentioned point is pointed out, and a clearance (a gap) for preventing the bracket from coming into contact with the stator is provided at the contact portion of the both brackets with the stator near the bolt through holes, and the bolt is tightened. At times, stress is prevented from concentrating on the contact portion between the bracket and the stator, so that the deformation of the stator is suppressed and the magnetic noise is reduced.

In addition to the technique disclosed in Japanese Unexamined Patent Publication No. 4-351442, conventionally, by increasing the number of through bolts, the force applied to the stator core is dispersed or equalized, or the stator core or By adding reinforcing ribs to the bracket to increase rigidity and suppress deformation of the stator core, the air gap between the stator core and rotor core is made uniform, and the magnetic excitation force acting on the stator core is reduced. By doing so, measures have been taken to reduce magnetic noise.

[0007]

The vehicle alternator is being reduced in size and weight. To this end,
It is effective to reduce the thickness of the bracket and the stator core and reduce the reinforcing ribs. In this case, the rigidity of the bracket and the stator core will decrease. Further, it is necessary to reduce the number of the through bolts as much as possible, but in this case, the uneven distribution of the stress due to the axial force of the through bolt becomes significant in the bracket.

The above-described decrease in rigidity and uneven distribution of stress due to the axial force of the through bolts together increase the deformation of the bracket and make it a wide range.

In such a situation, as described in the above-mentioned publication, by providing a clearance in the vicinity of the bolt through hole of the bracket, deformation of the stator core is suppressed, and thereby magnetic noise is reduced. That effect is not being sufficiently obtained.

Further, the deformation of the bracket causes a large bending force to be generated at the connecting portion with the stator core, and this bending force is transmitted to the stator core at the connecting portion to deform the stator core. There is. Therefore, it is effective to suppress the deformation of the stator core and reduce the magnetic noise by making the bending force difficult to be transmitted to the stator core.

An object of the present invention is to provide a vehicle for a vehicle in which a bending force, which is generated when the bracket is deformed over a wide range with respect to the stator core, is difficult to be transmitted to the stator core at a contact portion between the bracket and the stator core. The use of an AC generator is intended to suppress deformation of the stator core and reduce magnetic noise.

[0012]

In order to achieve the above object, a vehicular AC generator of the present invention is a rotor rotated by an engine of a vehicle, and a tubular shape arranged so as to surround the rotor. And a front bracket and a rear bracket arranged so as to sandwich the stator from both end surface sides of the stator, and the stator is fitted to the bracket, In a vehicle alternator having a connecting surface between a stator and the bracket, one of the connecting surfaces facing the stator and the bracket has a width narrower than the width of the connecting surface. Is provided, and the stator and the bracket are brought into contact with each other at the convex portion.

Further, in order to achieve the above object, the vehicle alternator of the present invention comprises a rotor rotated by an engine of the vehicle, and a cylindrical stator arranged so as to surround the rotor. , A front bracket and a rear bracket that are arranged so as to sandwich the stator from both end surface sides of the stator, and the bracket has a connection surface (hereinafter, an end portion) with the stator on an end surface thereof. Connection surface) and a connection surface with the stator (hereinafter referred to as an inner peripheral connection surface) on an inner peripheral surface connected to the end connection surface, and the stator is formed with a step from the end surface. And a connection surface in contact with the end connection surface (hereinafter referred to as a step connection surface) and a connection surface in contact with the inner peripheral connection surface on an outer side surface connected to the step connection surface (hereinafter referred to as a side surface connection surface). ) And an alternator for vehicles equipped with In each of the connecting surfaces formed on the bracket and the bracket, a protruding portion having a width narrower than the width of the connecting surface is provided on one of the opposing connecting surfaces, and the stator is formed by the protruding portion. The bracket is brought into contact with the bracket.

Further, in order to achieve the above object, as another configuration, a rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and a stator of the stator. From both end surface sides, a front bracket and a rear bracket that are arranged so as to sandwich the stator are provided, and the bracket has a connection surface with the stator (hereinafter,
End connecting surface) and a connecting surface with the stator on an inner peripheral surface connected to the end connecting surface (hereinafter referred to as an inner connecting surface).
The stator is formed with a step with respect to the end surface of the stator, and has a connection surface in contact with the end connection surface (hereinafter referred to as a step connection surface) and an outer side surface connected to the step connection surface, A vehicular AC generator having a connection surface in contact with the inner peripheral connection surface (hereinafter referred to as a side surface connection surface), a connection portion including the end connection surface and the step connection surface, and the inner periphery. Of any one of the connecting portions consisting of the connecting surface and the side surface connecting surface, on any one of the connecting surfaces of the facing surface of the stator and the bracket,
Form a convex portion with a width narrower than the width of the connecting surface,
In the other connecting portion in which the convex portion is not formed, a concave portion is formed on any one of the connecting surfaces of the stator and the bracket facing each other, and the stator is formed by the convex portion. And the bracket are in contact with each other.

Further, in order to achieve the above object, as another structure, a rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and a stator of the stator. From both end surface sides, a front bracket and a rear bracket that are arranged so as to sandwich the stator are provided, and the bracket has a connection surface with the stator (hereinafter,
End connecting surface) and a connecting surface with the stator on an inner peripheral surface connected to the end connecting surface (hereinafter referred to as an inner connecting surface).
The stator is formed with a step with respect to the end surface of the stator, and has a connection surface in contact with the end connection surface (hereinafter referred to as a step connection surface) and an outer side surface connected to the step connection surface, In a vehicle alternator having a connection surface (hereinafter referred to as a side surface connection surface) in contact with the inner peripheral connection surface, an annular member having a convex portion is formed separately from the stator or the bracket. , An annular member having the convex portion, by configuring the connecting surface of any one of the stator or the bracket, to form a convex portion on the connection surface, via the convex portion, The stator and the bracket are connected.

Further, in order to achieve the above object, as another structure, a rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and a stator of the stator. From both end surface sides, a front bracket and a rear bracket that are arranged so as to sandwich the stator are provided, and the bracket has a connection surface with the stator (hereinafter,
End connecting surface) and a connecting surface with the stator on an inner peripheral surface connected to the end connecting surface (hereinafter referred to as an inner connecting surface).
The stator is formed with a step with respect to the end surface of the stator, and has a connection surface in contact with the end connection surface (hereinafter referred to as a step connection surface) and an outer side surface connected to the step connection surface, In a vehicular alternator having a connection surface in contact with the inner peripheral connection surface (hereinafter referred to as a side surface connection surface), a part or the whole of each connection surface of the bracket is attached to each connection surface of the stator. On the other hand, it is an inclined one.

Further, in order to achieve the above object, as another structure, a rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and a stator of the stator. From both end surface sides, a front bracket and a rear bracket that are arranged so as to sandwich the stator are provided, and the bracket has a connection surface with the stator (hereinafter,
End connecting surface) and a connecting surface with the stator on an inner peripheral surface connected to the end connecting surface (hereinafter referred to as an inner connecting surface).
The stator is formed with a step with respect to the end surface of the stator, and has a connection surface in contact with the end connection surface (hereinafter referred to as a step connection surface) and an outer side surface connected to the step connection surface, In a vehicular alternator having a connection surface in contact with the inner peripheral connection surface (hereinafter referred to as a side surface connection surface), a part or the whole of each connection surface of the bracket and an outer periphery in the vicinity of the end connection surface. And a surface inclined with respect to each connection surface of the stator.

[0018]

The convex shaped portion formed on one of the facing connecting surfaces of the stator and the bracket is formed to have a width narrower than the width of the connecting surface on which the convex shaped portion is formed. The stator and the brackets are brought into contact with each other in a state close to line contact. As a result, the bending force applied to the stator due to the deformation of the bracket is not transmitted to the stator.

The stator of any one of the connecting portion including the end connecting surface and the step connecting surface and the connecting portion including the inner peripheral connecting surface and the side connecting surface. The convex portion formed on one of the connecting surfaces of the connecting surface facing the bracket and the bracket is formed to have a width narrower than the width of the connecting surface on which the convex portion is formed. And the brackets are brought into contact with each other in a state close to line contact. Accordingly, the bending force generated by the deformation of the bracket with respect to the stator is not transmitted to the stator at the connection portion in which the convex portion is formed.

On the other hand, in the other connecting portion in which the convex portion is not formed, the concave portion formed on any one of the connecting surfaces of the stator and the bracket facing each other has a concave shape. The bending force generated in the stator by the deformation generated in the both brackets is not transmitted to the stator at the connection portion where the portion is formed.

An annular member having a convex portion formed separately from the stator or the bracket is attached to a connecting surface of the stator or the bracket, and has a convex portion formed on the connecting surface. Works the same way.

A surface formed on a part or the whole of each connection surface of the bracket and inclined with respect to each connection surface of the stator has a surface at the connection portion between the stator and the bracket.
Make up the corners. Further, on the outer peripheral surface in the vicinity of the end connection surface of the bracket, a surface inclined with respect to each connection surface of the stator, together with an inclined surface formed on a part or the whole of each connection surface of the bracket, A corner portion is formed at a connecting portion between the stator and the bracket. The corner portion realizes a contact state close to a line contact between the stator and the bracket, and the bending force generated in the bracket with respect to the stator is not transmitted to the stator.

As described above, since the bending force is not transmitted from the both brackets to the stator, the deformation of the stator is suppressed to be small, and the gap (air gap) between the stator and the rotor is kept uniform. Because of the sagging, the magnetic excitation force acting on the stator is reduced, and the magnetic noise is reduced.

Further, as described above, the convex portion, the concave portion, and the corner portion make the contact between the stator and the bracket close to the line contact, but the line contact portion causes the stator generated in the bracket. Does not transmit bending force to the stator. Therefore, it is possible to prevent the stator from being deformed by the bending force generated in a wide range of the bracket and generating the magnetic noise.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing the embodiments of the present invention, the structure of a conventional vehicle alternator will be described in detail with reference to FIGS.

The structure of the vehicle alternator is shown in FIG.
◆ Vehicle AC generator has a front bracket 1 and a rear bracket 2, and a stator core 3 supported by being sandwiched between both brackets 1 and 2, and both brackets 1 and 4 are about four. The brackets 1 and 2 and the stator core 3 are fixed by fixing with the through bolt 1801. The stator core 3 has a cylindrical shape having a central axis parallel to the X axis indicated in FIG.

Inside the cylindrical stator core 3, a rotor magnetic pole core 1802 is provided. Rotor magnetic pole iron core 1
An exciting coil (not shown) for excitation is wound around 802, and an exciting current is supplied from a storage battery (not shown). The rotor magnetic pole core 1802 is fixed to the pulley 1803, and the rear bearing 1804 and the front bearing 180
It is supported by 5 so as to be rotatable around the X axis. The driving force from the engine or the like is transmitted to the pulley 1803 via a belt (not shown), and the rotor magnetic pole core 180
When 2 rotates, an AC voltage is induced in the stator coil 1806 provided in the stator core 3.

At this time, due to the interaction between the exciting magnetomotive force of the exciting coil and the magnetomotive force of the stator coil 1806 due to the armature reaction, a magnetic exciting force acts on the stator core 3 and the annular ring of the stator core 3 is operated. Vibration is excited and noise (hereinafter referred to as magnetic noise) is generated. At this time, if the gap between the rotor magnetic pole core 1802 and the stator core 3 called the air gap is non-uniform, the magnetic excitation force increases and the magnetic noise increases.

The following three factors can be cited as factors for making the air gap non-uniform.

First, there is an axial force due to the tightening of the through bolt 1801. Normally, about four through bolts 1801 are provided around the bracket, but the axial force thereof causes elastic deformation of the front bracket 1 and the rear bracket 2. The deformation is transmitted to the stator core 3 via the connecting portions 1807 and 1808 between the brackets 1 and 2 and the stator core 3, and the stator core 3 elastically deforms,
Air gap is uneven.

Second, there is an axial force of a mounting bolt (not shown). When mounting the vehicle alternator on an engine block or the like, the engine block or the like is sandwiched between the front mounting leg 4 and the rear mounting leg 6, and mounting bolts are passed through the front mounting hole 5 and the rear mounting hole 7 and tightened. At this time, the axial force of the mounting bolt causes the front bracket 1 and the rear bracket 2 to elastically deform, and the air gap becomes non-uniform for the same reason as described in the first factor.

Thirdly, the tension of the driving belt can be mentioned. The driving belt is stretched around the pulley 1803 with a predetermined tension. The tension causes elastic deformation of the front bracket 1, the rear bracket 2, and the stator core 3 to make the air gap non-uniform. .

FIG. 19 is a sectional view of a connecting portion between the brackets 1 and 2 of the conventional vehicle alternator and the stator core 3.
The details of the connection portions 1807 and 1808 of FIG. 18 are shown.

As described above, when both the brackets 1 and 2 are elastically deformed, the connecting surfaces 1901 and 1902 of the connecting portion 1807 and the connecting portion 1 extending over the entire outer peripheral portion of the stator core 3.
The bending force is directly transmitted to the stator core 3 via the connecting surfaces 1903 and 1904 of 808, and the stator core 3 is greatly deformed.

An embodiment of the present invention will be described below with reference to FIGS.
This will be described using 7. First Embodiment FIG. 1 shows the first embodiment of the present invention.
It will be described with reference to FIGS. 1 is a perspective view showing an embodiment of a vehicle AC generator of the present invention before the front bracket 1, the rear bracket 2, and the stator core 3 are connected.
FIG. 2 is a sectional view taken along the line II-II in FIG. 1 in a state where both the brackets 1 and 2 and the stator core 3 are connected. FIG. 3 is a view showing only a cross section of the front bracket 1 of FIG. FIG. 4 is a view showing only a cross section of the rear bracket 2 of FIG.

As shown in FIG. 1, a cylindrical stator core 3
Is connected to the front bracket 1 and the rear bracket 2 on both bottom sides thereof, respectively. Further, in order to fix the vehicle alternator to an engine block or the like, the front bracket 1 is provided with a front mounting leg 4 and a front mounting hole 5 in the front mounting leg 4, and the rear bracket 2 is rear mounted. A leg 6 and a rear mounting hole 7 are provided in the rear mounting leg 6.

The connecting surface of the connecting portion is formed of a bidirectional surface in which the stator core 3 and the brackets 1 or 2 face each other. That is, as shown in FIG. 2, a connecting surface (inner peripheral connecting surface) 8 formed on the inner peripheral surface connected to the end surface of the front bracket 1 and a connecting surface (end connecting surface) 9 formed on the end surface. Is a connection surface (side surface connection surface) 8 ′ formed on the outer side surface connected to the end surface of the stator core 3 and a connection surface formed by forming a step with the end surface of the stator core 3 (step portion connection). Face) 9 '. The connecting surface (inner peripheral connecting surface) 10 formed on the inner peripheral surface connected to the end surface of the rear bracket 2 and the connecting surface (end connecting surface) 11 formed on the end surface are respectively the stator core 3 Connection surface (side surface connection surface) 10 'formed on the outer side surface connected to the end surface of the
And a connecting surface (stepped portion connecting surface) 11 ′ formed by forming a step with the end surface of the stator core 3.

Further, as shown in FIGS. 2 to 4, the connecting surfaces 8, 9, 10 and 11 of the brackets 1 and 2 with the stator core 3 are respectively connected to the respective surfaces 8, 9, 10, 11 as shown in FIG. Width W1,
Convex shaped portion 201 having a width narrower than W2, W3 and W4
To 204 are formed. The convex portions 201 to 204 are
As shown in FIGS. 3 and 4, w1, w2, w
It has a width of 3, w4. Therefore, the two brackets 1 and 2 and the stator core 3 have the convex portions 201 to 2
At 04, they are in contact with each other in a state close to line contact.

In this embodiment, the convex portions 201 to 204 are formed in an annular shape on the circumference around the center of rotation of the rotor magnetic pole core (not shown).

The front bracket 1 and the rear bracket 2 are fastened in the direction to draw each other by through bolts (not shown in FIG. 1) as described in the prior art (FIG. 18). At this time, as shown by the arrow 101 in FIG. 1, both brackets 1 and 2 receive the axial force of the through bolt. The axial force 101 acts on the portion where the through bolt is provided, but a part thereof is shown in FIG.

Further, as described above, when the vehicle alternator is mounted on the engine block or the like, the engine block or the like is sandwiched between the front mounting leg 4 and the rear mounting leg 6, and the front mounting hole 5 and the rear mounting hole are mounted. Pass a mounting bolt (not shown) through hole 7,
tighten. At this time, the axial force of the mounting bolt acts as shown by the arrow 102 in FIG.

According to this embodiment, the contact between the brackets 1 and 2 and the stator core 3 is such that the convex portions 201 to 20 are in contact with each other.
4, the brackets 1 and 2 are deformed by the axial forces 101 and 102 due to the state close to the line contact, and even if a bending force is generated on the stator core 3, it is transmitted to the stator core 3. Is suppressed. Therefore, since the deformation of the stator core 3 is suppressed and the air gap is kept uniform,
It is possible to obtain a vehicle alternator with low magnetic noise.

Furthermore, since the stator core 3 is less likely to be deformed by using such a connecting portion, the air gap can be kept uniform even if the number of through bolts and reinforcing ribs is reduced, so that it can be used for vehicles. The weight of the AC generator can be reduced.

The front bracket 1 and the rear bracket 2 are usually formed as aluminum castings. In this case, since the outlines of the convex portions 201 to 204 can be provided at the time of casting, only the portion that directly contacts the stator core 3 may be finished by cutting or grinding. Since the cutting or grinding is the same as the processing performed on the conventional connecting surface, it does not complicate the processing step and does not increase the cost required for the processing.

The convex portions 201 to 204 may be provided on any one of the connecting surfaces facing each other at each connecting portion between the brackets 1 and 2 and the stator core 3.

Further, in this embodiment, the case where there are four through bolts is shown, but the places and the number of through bolts and mounting bolts are not limited to those shown in FIG.

The second embodiment will be described with reference to FIG.
FIG. 5 is a perspective view showing a connection surface of the rear bracket 2 with the stator core 3 according to another embodiment of the present invention. In this embodiment, the front bracket 1 and the rear bracket 2 have exactly the same structure at the connecting portion with the stator core 3. Therefore, in FIG. 5, only the connecting portion of the rear bracket 2 is shown,
Hereinafter, the connecting portion of the rear bracket 2 will be described.

In this embodiment, the rear bracket 2 and the stator core 3 are provided on the connection surface 11 of the rear bracket 2 with the stator core 3.
A plurality of arc-shaped convex portions 501 to 505 are formed around the center of rotation of a rotor magnetic pole core (not shown) for making line contact with (not shown). Connection surface 10
Also, although a convex portion similar to the convex portions 501 to 505 is formed, only 506 to 508 are illustrated in FIG. In the following description, the convex portion 506
Reference numerals 508 to 508 include a convex portion (not shown).

The convex portions 501 to 505 and 506
Reference numerals 508 to 508 denote the rear brackets 2 as in the first embodiment.
Alternatively, it may be formed on either one of the facing connecting surfaces of the stator core 3.

The convex portions 501 to 505 and 506
Through 508 are formed so as to avoid a portion where axial force concentrates, such as a through bolt (not shown) and a mounting bolt (not shown). Then, the convex portions 501 to 50
5 and 506 to 508 make the contact between the rear bracket 2 and the stator core 3 close to the line contact, and the rear bracket 2 to the stator core 3 as in the case of the convex portions 201 to 204 in the first embodiment. Suppresses the transmission of bending force to.

As described above, the convex portions similar to the convex portions 501 to 505 and 506 to 508 are formed at the connecting portion between the front bracket 1 and the stator core 3.

Further, both brackets 1 and 2 and stator core 3
In the connection portion with and, one of the connection portions is formed with an annular convex portion as shown in the first embodiment, and the other connection portion is formed with a discontinuous circle like this embodiment. You may form an arc-shaped convex-shaped part.

Further, a convex portion as in this embodiment is formed on any of the connecting surfaces 8, 8 ', 10, 10', and any of the connecting surfaces 9, 9 ', 11, 11' is You may form the annular convex-shaped part as shown in 1st Example.

According to this embodiment, since the portions of the brackets 1 and 2 where the stress due to the axial force of the bolts concentrates do not contact the stator core 3, the transmission of the stress to the stator core 3 is further improved. Can be suppressed. Therefore, the stator core 3 is prevented from being deformed, the air gap is kept uniform, and an AC generator for a vehicle with low magnetic noise can be obtained.

As in the first embodiment, the convex portion 5
The outlines of 01 to 505 and 506 to 508 may be formed at the time of casting, and only the portion that directly contacts the stator core 3 may be cut or ground.

A third embodiment will be described with reference to FIGS. 6 and 7. 6 is a sectional view similar to FIG. 2, showing another embodiment of the present invention. FIG. 7 shows the embodiment of FIG.
FIG. 7 is a sectional view similar to FIG. 6, showing an embodiment in which a part of the configuration is changed.

The embodiment of FIG. 6 is the same as the first embodiment.
The convex portions 601 to 604 similar to the convex portions 201 to 204 formed on the connecting surfaces 8 to 11 of the front bracket 1 and the rear bracket 2 are formed on the connecting surfaces 8'to 11 'of the stator core 3, respectively. It was done.

Similar effects can be obtained even if the convex portions are provided on the connecting surfaces 8'to 11 'of the stator core 3 as in the present embodiment.

Further, as shown in FIG. 7, in the embodiment of FIG. 6, when an excessive stress acts on the convex shaped portions 601 and 603, as shown in 701 to 704, one connecting surface is projected. A plurality of shaped portions may be formed. Thereby, it is possible to prevent excessive stress from being applied to the convex portion.

In FIG. 7, the connecting surfaces 8 ', 10' have a plurality of convex portions, but the connecting surfaces 9 ', 11' may have a plurality of convex portions, or both of them have a plurality of convex portions. You may The same applies when the convex portion is provided on the bracket side.

A fourth embodiment will be described with reference to FIG.
◆ FIG. 8 shows a stator core 3 according to another embodiment of the present invention,
It is the figure seen from the direction where front bracket 1 or back bracket 2 is connected.

This embodiment is the third embodiment shown in FIG. 6 or 7.
In the embodiment, the convex portions 601 to 604 or 7
01 to 704 are formed intermittently, that is, a plurality of arc-shaped convex portions 801 to 810 and the like. The convex portions 801 to 810 and the like have cross marks 811 to 814.
The portion where the stress due to the axial force of the through bolt shown in (1) and the portion where the stress due to the axial force of the mounting bolt shown with X are concentrated are formed so as to be avoided.

As a result, the convex portions 801 to 810 are formed.
In addition to the effect of suppressing the transmission of bending force such as the above, an effect of suppressing the transmission of the stress from the brackets 1 and 2 to the stator core 3 is obtained in the portion where the stress due to the axial force of each bolt is particularly concentrated. To be

The positions and the number of the through bolts, the positions of the mounting bolts, etc. are not limited to those shown in FIG. 4, and the same concept can be applied even if the positions and the numbers of the bolts are different.

The fifth embodiment will be described with reference to FIG.
FIG. 9 is a sectional view similar to FIG. 2, showing another embodiment of the present invention. ◆ On the connecting surfaces 9'and 11 'of the stator core 3,
Annular convex portions 901 and 902 are formed on the circumference around the center of rotation of the rotor magnetic pole core (not shown). Furthermore, on the connecting surfaces 9 ', 11' side of the connecting surfaces 8 ', 10' of the stator core 3, an annular concave portion is formed on the circumference around the center of rotation of the rotor magnetic pole core (not shown). Shape part 90
3, 904 are formed.

As in this embodiment, the convex portions 901 and 90
Even by providing 2 and the concave portions 903 and 904 in combination, it is possible to suppress the bending force generated in the brackets 1 and 2 to the stator core 3 from being transmitted to the stator core 3. Depending on the case, such a concave portion may be provided only in a portion where the axial force of the through bolt or the mounting bolt is concentrated, instead of the annular shape.

A sixth embodiment will be described with reference to FIGS. 10 to 14. ◆ FIG. 10 shows another embodiment of the present invention.
FIG. 6 is a perspective view of an annular member having a convex portion that is used by being fitted to the connection surface of the stator core 3. FIG. 11 is a sectional view when the brackets 1 and 2, the stator core 3, and the annular member 12 having a convex shape are respectively connected in the XI cross section of FIG. FIG. 12 is a perspective view of the annular member of FIG. 10 in which a notch portion is formed in the convex portion according to the present embodiment. 13 is a sectional view taken along the line XIII-XIII in FIG. FIG. 14 is a sectional view taken along line XIII-XIII in FIG.
It is sectional drawing when both brackets 1 and 2, the stator core 3, and the annular member 12 which has a convex-shaped part are each connected.

As shown in FIG. 10, the annular member 12 is formed with convex portions 1001 and 1002. As shown in FIG. 11, the annular member 12 has surfaces 1103 and 110
4 is the connecting surface 8'or 10 'of the stator core 3, respectively.
Is connected to the stator core 3 so as to come into contact with the connection surface 9'or 11 '. Furthermore, the connecting surface 8 or 10 of the front bracket 1 or the rear bracket 2 and the connecting surface 9 or 1
The brackets 1 and 2 and the annular member 12 are connected so that 1 contacts the convex portions 1001 and 1002, respectively.

Since the stator core 3 contacts both the brackets 1 and 2 through the convex portion of the annular member 12 fitted to the connecting surface, the stator core 3 and the brackets 1 and 2 are not in contact with each other. , It becomes a state close to line contact. Therefore, the transmission of the bending force from the brackets 1 and 2 to the stator core 3 can be suppressed.

Further, as shown in FIG. 12, notches 1101 to 11 are formed in the convex portions 1001 and 1002 of FIG.
08 and the like may be provided. At this time, the notch 1201,
XIII-XIII cross section in the portion where 1206 is formed is
It is as shown in FIG.

The cutouts 1201 to 1208 are formed so as to avoid a portion where stress due to the axial force of the through bolt or the mounting bolt is concentrated. Therefore, the positions and the numbers of the notch portions differ depending on the positions and the numbers of the through bolts and the mounting bolts.

In the XIII-XIII arrow cross section, as shown in FIG. 14, since the brackets 1 and 2 and the stator core 3 are not in contact with each other, the brackets 1 and 2 are not connected to the stator core 3. The transmission of stress can be suppressed.

According to this embodiment, the convex portion is not formed on both the brackets 1 and 2 and the stator core 3 but is formed as a separate member, so that the formation can be performed more easily.

The seventh embodiment will be described with reference to FIGS. ◆ FIG. 15 shows another embodiment of the present invention,
FIG. 3 is a sectional view similar to FIG. 2. FIG. 16 shows the front bracket 1
FIG. 3 is a view of the rear bracket 2 seen from the direction in which the stator core 3 is connected. FIG. 17 is a sectional view taken along line XVII-XVII of FIG.

In this embodiment, as shown in FIG. 15, a portion of the front bracket 1 connected to the stator core 3 has a surface 1501 inclined with respect to the connecting surfaces 8'and 9'of the stator core 3.
To 1503 are formed to form corners 1504 and 1505. Similarly, in the portion of the rear bracket 2 that is connected to the stator core 3, surfaces 1506 to 1508 that are inclined with respect to the connection surfaces 10 ′ and 11 ′ of the stator core 3 are formed, and the corner portion 1
509 and 1510.

Corners 1504, 1505, 1509, 15
10 creates a good line contact state between the brackets 1 and 2 and the stator core 3, and can suppress the transmission of bending force from the brackets 1 and 2 to the stator core 3.

Further, as shown in FIG. 16, notches 1601 to 1605 are formed in the portion where the stress due to the axial force of the through bolt or the mounting bolt is concentrated, if necessary. FIG. 17 shows a cross section taken along the arrow XVII-XVII in the cutout portion. The notch portions 1601 to 1605 are portions where the stress is concentrated and suppress the transmission of the stress from the brackets 1 and 2 to the stator core 3.

Further, the positions and the number of notches differ depending on the positions and the numbers of through bolts and mounting bolts.
It is not limited to those shown in FIG.

Since both brackets 1 and 2 are usually cast aluminum, such a relatively complicated shape can be easily produced. That is, at the casting stage, the shapes of both brackets 1 and 2 as shown in FIG.
Finishing may be performed by cutting or grinding 4,1505,1509,1510. By taking such a processing procedure, it is possible to create a line contact state between the brackets 1 and 2 and the stator core 3 without increasing the number of cutting or grinding processes.

As described above, by connecting both of the stator core and the bracket so that the convex portion or the corner portion formed on the connecting surface of the bracket comes into contact with the other connecting surface, it is very narrow. A contact state with a contact width (line contact state) is created. In such a contact state, even if the bracket is deformed by the axial force of the through bolts or mounting bolts and a bending force is generated on the stator core, the bending force is prevented from being transmitted from the bracket to the stator core. Has the effect of

A line contact state is created by the above-mentioned convex portion or corner portion, and furthermore, the contact portion between the stator core and the bracket where the stress due to the axial force of the through bolt or the mounting bolt is particularly concentrated is not in contact with them. It is also possible to suppress the deformation of the stator core by forming the concave portion and the cutout portion.

As described above, if the deformation of the stator core can be suppressed by devising the shape of the connecting portion between the stator core and the bracket, in order to increase the rigidity of the stator core and the bracket, the meat It is possible to reduce the size and weight without the need for a thick structure or additional ribs.

Furthermore, with any of the above constructions,
It is possible to use the same manufacturing process as the present. Further, since a complicated convex portion and an inclined surface may be roughly formed at the time of casting and the contact surface of the connection portion may be finished by cutting or grinding, the manufacturing cost is not increased.

[0084]

According to the present invention, the stator core and the bracket are in a contact state (line contact state) having a very narrow contact width due to the convex shape portion or the corner portion provided at their connecting portions. It is connected. As a result, even if the bracket is deformed by the axial force of the through bolts or the mounting bolts and a bending force is generated on the stator core, the bending force is not transmitted from the bracket to the stator core.

Therefore, since the deformation of the stator core is suppressed and the gap between the stator core and the rotor magnetic pole core, that is, the air gap is kept uniform, the magnetic excitation force acting on the stator core becomes small, Magnetic noise is reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a vehicle AC generator of the present invention.

FIG. 2 is a sectional view taken along the line II-II in a state where both brackets of FIG. 1 and a stator core are connected.

FIG. 3 is a view showing only a cross section of the front bracket shown in FIG. 2;

FIG. 4 is a view showing only a cross section of the rear bracket shown in FIG.

FIG. 5 is a perspective view showing another embodiment of the present invention with respect to the connecting surfaces of both brackets with the stator core.

FIG. 6 is a sectional view showing another embodiment of the connecting portion of the vehicle alternator of the invention.

7 is a cross-sectional view showing an example in which the configuration is further changed in the example of the connecting portion of the vehicle AC generator of FIG.

FIG. 8 is a diagram showing an embodiment of a connecting surface of the stator core of the vehicle alternator of the present invention with the bracket.

FIG. 9 is a cross-sectional view showing another embodiment of the connecting portion of the vehicle alternator of the present invention.

FIG. 10 is a perspective view of an annular member having a convex shape, which is used for the connecting portion of the vehicle AC generator of the present invention.

11 is a cross-sectional view showing a connecting portion of the vehicle alternator of the invention including the cross-sectional portion XI of FIG.

FIG. 12 is a perspective view of the convex member of FIG. 10 in which a convex notch is formed.

13 is a sectional view taken along the line XIII-XIII in FIG.

14 is a cross-sectional view showing a connecting portion of the vehicle AC generator of the present invention including a cross-sectional view taken along the line XIII-XIII of FIG.

FIG. 15 is a sectional view showing another embodiment of the connecting portion of the vehicle alternator of the invention.

FIG. 16 is a view of the connecting surface of the bracket of the present invention as seen from the direction in which the stator core is connected.

17 is a sectional view taken along the arrow XVII-XVII in FIG.

FIG. 18 is a diagram showing a configuration of a conventional vehicle AC generator.

FIG. 19 is a cross-sectional view showing a connecting portion between a bracket and a stator core of a conventional vehicle AC generator.

[Explanation of symbols]

1 ... Front bracket, 2 ... Rear bracket, 3 ... Stator core, 4 ... Front mounting leg, 5 ... Front mounting hole, 6 ... Rear mounting leg, 7 ...
Rear mounting holes, 8 to 11, 8'to 11 '... connecting surface, 12 ... annular member 12, W1 to W4, w1 to w4 ... connecting surface width, 2
01-204, 501-508, 601-604, 70
1-704, 801-810, 901, 902, 100
1, 1002 ... Convex portion, 811 to 814 ... Through bolt position, 815 ... Mounting bolt position, 903, 904 ... Recessed portion, 1201 to 1208, 1601 to 1605 ... Notch portion, 1501 to 1503, 1506 to 1508 ... Slopes, 1504, 0505, 1509, 1510 ... Corners.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Honda, 2520 Takaba, Katsuta-shi, Ibaraki Prefecture, Hitachi Automotive Systems Division (72) Inventor Susumu Terumoto 2520, Takaba, Katsuta-shi, Ibaraki Prefecture Co., Ltd. Hitachi, Ltd. Automotive Equipment Division

Claims (10)

[Claims] 1. A rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and the stator sandwiched from both end surface sides of the stator. In a vehicle alternator, comprising: a front bracket and a rear bracket, wherein the stator is fitted to the bracket; and a connecting surface between the stator and the bracket. A convex portion having a width narrower than the width of the connecting surface is provided on either one of the connecting surfaces facing each other and the bracket, and the stator and the bracket contact each other at the convex portion. An alternator for vehicles, characterized in that 2. A rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and the stator sandwiched from both end surface sides of the stator. A front bracket and a rear bracket that are arranged on the bracket, wherein the bracket has a connection surface with the stator on an end surface thereof (hereinafter referred to as an end connection surface), and an inner peripheral surface connected to the end connection surface. A connecting surface with the stator (hereinafter referred to as an inner peripheral connecting surface), the stator is formed with a step with respect to the end surface thereof, and the connecting surface in contact with the end connecting surface (hereinafter, the step connecting surface) And a connecting surface (hereinafter referred to as a side surface connecting surface) in contact with the inner peripheral connecting surface on an outer side surface connected to the step connecting surface, the stator and the bracket. On each of the connection surfaces formed on and A vehicular vehicle, characterized in that a convex portion having a width narrower than the width of the connecting surface is formed on one of the connecting surfaces, and the stator and the bracket are brought into contact with each other at the convex portion. AC generator. 3. A rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and the stator sandwiched from both end surface sides of the stator. A front bracket and a rear bracket that are arranged on the bracket, wherein the bracket has a connection surface with the stator on an end surface thereof (hereinafter referred to as an end connection surface), and an inner peripheral surface connected to the end connection surface. A connecting surface with the stator (hereinafter referred to as an inner peripheral connecting surface), the stator is formed with a step with respect to the end surface thereof, and the connecting surface in contact with the end connecting surface (hereinafter, the step connecting surface) And a connecting surface (hereinafter, referred to as a side surface connecting surface) in contact with the inner peripheral connecting surface on an outer side surface connected to the step connecting surface, the end connecting surface and A connecting portion including the stepped portion connecting surface, and the inner peripheral connecting surface The width of the connecting surface of any one of the connecting portions including the side surface connecting surface is narrower than the width of the connecting surface of any one of the connecting surfaces facing the stator and the bracket. A convex portion having a width is formed, and a concave portion is formed on one of the connecting surfaces of the other connecting portion where the convex portion is not formed and which faces the stator and the bracket. The stator and the bracket are brought into contact with each other at the convex portion, and the vehicle alternator is characterized in that. 4. A rotor rotated by a vehicle engine, a cylindrical stator arranged so as to surround the rotor, and the stator sandwiched from both end surface sides of the stator. A front bracket and a rear bracket that are arranged on the bracket, wherein the bracket has a connection surface with the stator on an end surface thereof (hereinafter referred to as an end connection surface), and an inner peripheral surface connected to the end connection surface. A connecting surface with the stator (hereinafter referred to as an inner peripheral connecting surface), the stator is formed with a step with respect to the end surface thereof, and the connecting surface in contact with the end connecting surface (hereinafter, the step connecting surface) And a connecting surface (hereinafter referred to as a side surface connecting surface) in contact with the inner peripheral connecting surface on an outer side surface connected to the step portion connecting surface, the stator or the bracket. Separately, form an annular member with a convex shape. Then, by mounting the annular member having the convex portion on the connecting surface of any one of the stator or the bracket, a convex portion is formed on the connecting surface, and the convex portion is interposed. An alternator for a vehicle, wherein the stator and the bracket are connected. 5. The convex portion is provided on a circumference centered on a rotation center of the rotor.
The vehicle alternator according to any one of 2, 3, and 4. 6. The vehicle alternator according to claim 1, wherein the convex portion is provided discontinuously. 7. The protrusion according to claim 1, wherein the convex portion is discontinuously provided on a circumference around the center of rotation of the rotor. Vehicle alternator. 8. A rotor rotated by an engine of a vehicle, a tubular stator arranged so as to surround the rotor, and the stator sandwiched from both end surface sides of the stator. A front bracket and a rear bracket that are arranged on the bracket, wherein the bracket has a connection surface with the stator on an end surface thereof (hereinafter referred to as an end connection surface), and an inner peripheral surface connected to the end connection surface. A connecting surface with the stator (hereinafter referred to as an inner peripheral connecting surface), the stator is formed with a step with respect to the end surface thereof, and the connecting surface in contact with the end connecting surface (hereinafter, the step connecting surface) And a connecting surface contacting the inner peripheral connecting surface (hereinafter referred to as a side surface connecting surface) on an outer side surface connected to the step connecting surface (hereinafter, referred to as a side surface connecting surface). Part or all of the Te, alternator for a vehicle, characterized in that tilted. 9. A rotor rotated by an engine of a vehicle, a cylindrical stator arranged so as to surround the rotor, and the stator sandwiched from both end surface sides of the stator. A front bracket and a rear bracket that are arranged on the bracket, wherein the bracket has a connection surface with the stator on an end surface thereof (hereinafter referred to as an end connection surface), and an inner peripheral surface connected to the end connection surface. A connecting surface with the stator (hereinafter referred to as an inner peripheral connecting surface), the stator is formed with a step with respect to the end surface thereof, and the connecting surface in contact with the end connecting surface (hereinafter, the step connecting surface) And a connecting surface contacting the inner peripheral connecting surface (hereinafter referred to as a side surface connecting surface) on an outer side surface connected to the step connecting surface (hereinafter, referred to as a side surface connecting surface). A part or the whole of and the outer circumference near the end connection surface Preparative, automotive alternator, characterized in that is inclined with respect to each connection surface of the stator. 10. The vehicle alternator according to claim 8 or 9, wherein a cutout portion is formed in the inclined surface.