JPH05137290A - Ac generator for vehicle - Google Patents

Abstract

PURPOSE:To reduce a deformation of a stator core and to decrease electromagnetic sound by elastically supporting the core by front and rear brackets through an elastic pressing member in an axial direction, supporting by engaging in a radial direction, and clamping both the brackets with clamping bolts. CONSTITUTION:A stator 1 having a stator core 2 and a stator coil 3 is integrated by inserting a plurality of clamping bolts 14 between a front brackets 32 and a rear bracket 33 opposed to each other. An elastic pressing member 34 made of a spring member is inserted between the stepped part of the outer periphery of the core 2 at the end side and the stepped parts of the inner peripheries of the corresponding brackets 32, 33 at the end side, and the core 2 is elastically supported in the axial direction. The outer periphery of the stepped part of the core 2 is engaged with the bores of the brackets 32, 33 at the end side and radially supported. Thus, even if the bolts 14 are clamped, an irregularity in the air gaps due to the deformation of the core is prevented, and noise due to electromagnetic sound can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alternator of a salient pole rotary type rotor having a bracket support, and more particularly to a means for supporting a stator core by a bracket.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are a longitudinal sectional view and a front view of a conventional vehicle alternator. In the figure, 1 is a stator, which comprises a stator core 2 and a stator coil 3. 4 is a rotor, which is configured as follows. Reference numerals 5 and 6 are magnetic pole cores of opposite polarities, and both magnetic pole tooth portions 5a and 6a are alternately projected in the circumferential direction. 7 is an exciting coil held between both magnetic pole cores, 8 is a rotary shaft to which the magnetic pole cores 5 and 6 are fixed, 9 is a pair of slip rings fixed to the rotary shaft 8 via an insulating sleeve, and 10 and 11 are The fan is fixed to the magnetic pole cores 5 and 6.

Next, 12 and 13 are front brackets and rear brackets, which connect the stator core 2 with tightening bolts 14. Due to ventilation, the front bracket 12 has a plurality of intake holes 12a at its end and a plurality of exhaust holes 12b at its outer periphery.
And are provided. Further, the rear bracket 13 is provided with a plurality of intake holes 13a at the end and a plurality of exhaust holes 13b at the outer peripheral part for ventilation. The rotating shaft 8 is a bearing 15
And 16 through front bracket 12 and rear bracket 1
It is supported by 3. Reference numeral 17 denotes a pulley fixed to the rotary shaft 8, and the rotation of the engine is transmitted via a belt to rotate the rotor 4.

A rectifier 18 rectifies the AC voltage induced in the stator coil 3 into a DC voltage and outputs the DC voltage, and a voltage adjuster 19 detects the rectifier output voltage and controls the exciting current to adjust the terminal voltage to a predetermined value. It is a vessel. 20 is a brush holder,
The held brush 21 is pressed against the slip ring 9 to pass an exciting current.

In the above AC generator, when the rotor 4 is rotated, an AC voltage is induced in the stator coil 3 to supply electric power and generate heat. The stator 1 part and the rotor 4 part are cooled by the ventilation generated by the rotation of the fans 10 and 11.

[0006]

In the conventional vehicle alternator as described above, the both ends of the outer circumference of the stator core 2 are tightened with the tightening bolts 14 by the front bracket 12 and the rear bracket 13. Thus, they are coupled and supported by the pressing in the axial direction and the fitting in the radial direction. The stator core 2 is deformed by pressing the bolts 14 in four axial directions,
There is a problem that the air gap becomes non-uniform and the noise due to electromagnetic noise increases.

The present invention has been made in order to solve such a problem, and provides a vehicle AC generator in which electromagnetic noise is reduced by pressing and supporting the stator core with both brackets so as to reduce deformation. The purpose is to get.

[0008]

In a vehicle AC generator according to the present invention, a front bracket and a rear bracket are aligned at their corresponding end faces and tightened with tightening bolts, and a stepped portion on both ends of the outer circumference of the stator core. Among them, an elastic pressing member is interposed in the axial direction between the stepped portion on at least one side and the stepped portions on the inner circumferences of the end faces of both brackets to elastically support the stator core in the axial direction, and The stator core is supported in the radial direction by fitting by the inner circumferential portion on the end side of the bracket.

[0009]

In the present invention, the stator core is elastically supported by both brackets in the axial direction through the elastic pressing member,
Since they are supported by fitting in the radial direction, the deformation of the stator core due to the tightening of the tightening bolts is reduced, uneven air gaps are eliminated, and electromagnetic noise is reduced.

[0010]

EXAMPLES Example 1. FIG. 1 is a vertical cross-sectional view of an automotive alternator according to the present invention.
a and 6a are the same as those in FIG. Reference numerals 32 and 33 denote a front bracket and a rear bracket, respectively, and end portions facing each other are fitted together at a position where the tightening bolt 14 is provided (see FIG. 4).
An elastic pressing member formed of a spring member is provided between the stepped portion on the outer circumferential surface end side of the stator core 2 and the corresponding stepped portion on the inner circumferential end side of the front bracket 32 and the rear bracket 33. 34 is inserted and the stator core 2 is elastically pressed and supported in the axial direction.
Further, the outer diameter portions of the stepped portions of the stator core 2 are fitted in the inner diameter portions of the brackets 32 and 33 on the end side to support them in the radial direction. The front bracket 32 is provided with an intake hole 32a and an exhaust hole 32b, and the rear bracket 33 is provided with an intake hole 3a.
3a and an exhaust hole 33b are provided.

An example of the elastic pressing member 34 is shown in FIG. The elastic pressing member 34 is formed of a corrugated spring plate and elastically presses the stator core 2 in the axial direction to support it. The elastic pressing member 34 is not limited to the corrugated spring plate, and may be, for example, a stack of disc springs or a spiral spring.

As described above, the brackets 32 and 33 are directly connected by the tightening bolts 14, but the stator core 2 is elastically pressed and supported in the axial direction by the elastic pressing member 34, and thus the deformation thereof is small. The air gap is less uneven. Therefore, the electromagnetic noise is reduced.

Embodiment 2. In the first embodiment, the stator core 2 is axially supported from both sides via the pair of elastic pressing members 34, but one side is directly received by the bracket and the other side is supported via the elastic pressing members. May be.

[0014]

As described above, according to the present invention,
Since the stator core is elastically pressed and supported by the rear bracket through the elastic pressing member in the axial direction, the stator core is less deformed and the noise due to electromagnetic noise is reduced.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the elastic pressing member of FIG.

FIG. 3 is a vertical cross-sectional view of a conventional vehicle alternator.

4 is a front view of the AC generator of FIG.

[Explanation of symbols]

 1 Stator 2 Stator core 3 Stator coil 14 Tightening bolt 32 Front bracket 33 Rear bracket 34 Elastic pressing member

Claims (1)

[Claims] 1. A vehicular alternator in which a stator core having a stator coil attached thereto is supported by a pair of brackets on both sides with a plurality of tightening bolts. Of the stepped portions on both ends of the outer circumference of the stator core, at least one stepped portion is elastically pressed against the stepped portion of the inner circumferential portion on the end side of the bracket. Through the member, while supporting elastically in the axial direction,
An alternating current generator for a vehicle, characterized in that an outer circumferential end portion side of the magnetic pole stator core is fitted into an inner circumferential portion portion on the end portion side of the bracket and supported in a radial direction.