KR20090109049A - Rotor of an ac generator for a vehicle - Google Patents

Abstract

PURPOSE: A rotor of an ac generator for a vehicle is provided to reduce manufacturing costs by reducing the number of component. CONSTITUTION: A rotor of an ac generator for a vehicle is composed of pole cores(22,23), an annular member, and a rotation shaft(24). The annular member is arranged on the side of the pole core while being contacted with an axial section of the pole core. The rotation shaft has a plurality of grooves(37,38,39,40) which are vertical to it, and the annular member and the plural grooves are face with each other.

Description

ROTOR OF AN AC GENERATOR FOR A VEHICLE}

The present invention relates to a rotor of an alternator for a vehicle mounted on a passenger car or a truck.

The rotor of the vehicle alternator prevents movement of the pole core in the rotational direction by providing an axial groove on the outer circumference of the rotating shaft, and installs a cylindrical end portion having an outer diameter larger than the inner diameter of the pole core on the rotating shaft so that It prevents movement. (For example, refer patent document 1).

As another method, a plurality of grooves are formed at both ends of the axial grooves of the rotating shaft in a direction orthogonal to the axial direction, and the surface on the cooling fan fixing side of the pole core is axially caulked to partially surround the full core inner diameter. Means for preventing axial movement of the full core are also known by deforming and feeding into a plurality of grooves. (See Patent Document 2, for example.)

(Patent Document 1) Japanese Unexamined Patent Publication No. 2007-215294 (Fig. 1)

       (Patent Document 2) Japanese Unexamined Patent Publication No. 2008-54428 (Fig. 1)

However, since the rotor disclosed in Patent Literature 1 needs to provide an end portion in the rotational shaft, in order to manufacture the rotor, a material having a large outer diameter or a process for installing the end portion is required, so that the yield of the material is increased. There are problems such as bad or high processing cost.

In addition, the rotor described in Patent Literature 2 prevents the axial movement of the pole core by applying an axial load to the pole core end face so that the thickness is fed into the groove in the direction orthogonal to the rotation axis. Since the deformation becomes smaller from the cross section, the thickness becomes difficult to feed into the groove on the far side from the pole core cross section, and there is a problem that the fixing force in the axial direction of the pole core is lowered.

The present invention has been made in view of this, and an object of the present invention is to provide a rotor of an automotive alternator capable of improving yield, reducing processing cost, and improving fixing force of a pole core.

In order to solve the above problems, the rotor of the automotive alternator of the present invention is a pole core with a through hole, an annular member disposed in contact with the axial end surface of the pole core and a plurality of grooves formed in a direction perpendicular to the axial direction. It includes a rotating shaft having a plurality of grooves, and the annular member and the plurality of grooves are disposed to face each other, and the annular member and the plurality of grooves are engaged by pressing and deforming the annular member from the outer peripheral portion. By pressing and deforming the annular member from the outer circumferential portion, the thickness of the inner circumferential side of the annular member can be fed uniformly into the plurality of grooves so that these can be combined, so that the fixing force of the pole core can be improved. In addition, since there is no need to provide the end forming portion on the rotating shaft, it is not necessary to use a material having a large outer diameter or to process the forming of the end forming portion, thereby improving the yield of the material and reducing the processing cost.

The annular member of the present invention is provided with two corresponding to both axial end faces of the pole core, and the plurality of grooves formed on the rotating shaft are preferably provided with at least two pairs corresponding to the two annular members, respectively. As a result, the pole core can be reliably prevented from moving in the axial direction while being fitted from both sides along the axial direction.

In addition, the rotation shaft preferably has a plurality of grooves in the axial direction at a position corresponding to the through hole of the pole core. As a result, the pole core can be reliably prevented in the rotational direction in addition to the axial direction.

Further, at least one side of the two annular members is preferably formed integrally with the pole core. This enables a new cost down by reducing the number of parts.

EMBODIMENT OF THE INVENTION Hereinafter, the automotive alternator of one Embodiment to which this invention is applied is demonstrated in detail with reference to drawings. 1 is a cross-sectional view showing the entire structure of a vehicular alternator of one embodiment. As shown in Fig. 1, the vehicle alternator 1 of the present embodiment includes a rotor 2, a stator 3, a front side frame 4, a rear side frame 5, a brush device 6, and a stop value. (7), the voltage regulator 8, the pulley 9, etc. are comprised.

The rotor 2 is rotated by a pair of pole cores 22 and 23 as magnetic field cores having a plurality of claws, respectively, of the field coil 21 wound around the insulated copper wire in a cylindrical or concentric manner. It has a structure inserted from both sides through 24. Further, a cooling fan 25 for discharging the cooling wind sucked from the front side in the axial direction and the radial direction is attached to and fixed to the end surface of the pole core 22 on the front side (the pulley 9 side) by welding or the like. Similarly, a cooling fan 26 for discharging the cooling wind sucked from the rear side in the radial direction is attached to the end face of the pole core 23 on the rear side by welding or the like. The detailed structure of the rotor 2, in particular the fixing structure of the pole cores 22 and 23, will be described later.

The stator 3 includes a stator core 31, a three-phase stator coil 32, and an insulator 33 as an insulating member for electrically insulating between the stator core 31 and the stator windings 32.

The stop value 7 is for rectifying the three-phase alternating current, which is the output voltage of the three-phase stator coil 32 of the stator 3, to obtain a DC output, and the + pole side heat sink and-pole side heat sink are fixed at predetermined intervals, respectively. It is configured to include a plurality of rectifier elements that can be mounted on the heat sink by soldering or the like.

The front frame 4 and the rear frame 5 accommodate the rotor 2 and the stator 3, and at the same time the rotor 2 is supported rotatable about the rotation axis 24, The stator 3 arranged at predetermined intervals is fixed to the outer side of the pole cores 22 and 23 of the rotor 2. The stator 3 is fixed by tightly tightening the bolts 34 to four support parts 420 installed at equal intervals along the rotational direction of the rotor 2.

The voltage regulator 8 is for adjusting the output voltage of the vehicular alternator 1 by controlling the excitation current flowing through the field coil 21, and keeps the output voltage which is changed in accordance with the electric load and the amount of power generation substantially constant. The pulley 9 is for transmitting the rotation of the engine (not shown) to the rotor 2 in the on-vehicle alternator 1 and the nut 91 at one end of the rotating shaft 24 (opposite to the slip ring or the like). Tighten by In addition, the rear cover 10 for protecting them is attached and fixed to cover the brush device 6, the stop 7, and the voltage regulator 8.

Next, the fixing structure of the pole cores 22 and 23 of the rotor 2 is demonstrated. 2 is a cross-sectional view of the rotor 2, and the structure of the upper half with respect to the central axis of the rotating shaft 24 is shown. As shown in Fig. 2, through-holes are formed in the center of the pole cores 22 and 23. The pole cores 22 and 23 are provided in pairs such that the two are paired so that the claw stimuli are adjacent to each other in the rotational direction. The collars 35 and 36 are annular members formed of a metallic material, which are in contact with the axial cross-sections (sides on which the cooling fans 25 or 26 are fixed) of the pole cores 22 and 23 during assembly. Are placed in a state.

The rotating shaft 24 includes two pairs of grooves 37 and 38 formed in a direction orthogonal to the axial direction, and a plurality of grooves formed between two pairs of grooves 37 and 38 in an axial parallel direction. 39 and 40 and slip rings 41 and 42 formed near the ends. In the example shown in Fig. 2, two pairs of grooves 39 and 40 are provided at positions corresponding to the through-holes of the pole cores 22 and 23. It is also preferable to disperse | distribute and form three or more pairs of some groove | channel.

In the assembled state of the rotor 2, one side of the collar 35 and a plurality of pairs of grooves 37 on one side are disposed to face each other, and the collar 36 on the other side and the plurality of grooves on the other side ( 38) are arranged oppositely. By pressing the collars 35 and 36 after their assembly from the outside and deforming by caulking, the thickness of the inner circumferential side of the pressing positions of the collars 35 and 36 is taken into the valleys of the plurality of grooves 37 and 38. Thus, the collars 35 and 36 and the plurality of grooves 37 and 38 are engaged. By doing in this way, since the axial position of the collars 35 and 36 is fixed, the axial movement of the pair of pole cores 22 and 23 fitted to them can be prevented.

Moreover, when looking at the site | part in which the some groove | channel 39 and 40 was formed in the rotation direction, it becomes a concavo-convex shape including the recessed part formed from each groove | channel and the convex part between them, The outer diameter of the said convex part is a pole core 22, It is set larger than the inner diameter of the through-hole formed in the center of 23). Accordingly, when the rotary shaft 24 is press-fitted into the through hole in the center of the pole cores 22 and 23, the thickness of the inner circumferential surface of the plurality of grooves 39 and 40 and the corresponding pole cores 22 and 23 is determined by the plurality of these. It can be made to fit in the grooves 39 and 40, and the movement of the pair of pole cores 22 and 23 in the rotational direction can be prevented.

As described above, in the vehicle alternator 1 of the present embodiment, the collars 35 and 36 are deformed by pressing the collars 35 and 36 from the outer peripheral portion so that the thickness of the inner circumferential side of the collars 35 and 36 is uniformly inserted into the plurality of grooves 37 and 38. Since these can be combined with each other, the fixing force in the axial direction of the pole cores 22 and 23 can be improved. In addition, since it is not necessary to provide the end forming portion on the rotating shaft 24, it is not necessary to use a material having a large outer diameter or to process the end forming portion so that the yield of the material and the processing cost can be reduced.

In addition, two collars 35 and 36 are provided corresponding to both axial end surfaces of the pole cores 22 and 23, respectively, and the plurality of grooves 37 and 38 provided on the rotating shaft 24 are provided with these two collars ( Since at least two pairs are provided corresponding to 35 and 36 respectively, the pole cores 22 and 23 are reliably prevented in the axial movement of the pole cores 22 and 23 in a state where the pole cores 22 and 23 are fitted from both sides along the axial direction. can do.

In addition, since the rotating shaft 24 has a plurality of grooves 39 and 40 axially parallel to a position corresponding to the through-holes of the pole cores 22 and 23, the rotation shaft 24 as well as the rotational direction as well as the axial direction is assured. Movement of the cores 22 and 23 can be prevented.

In addition, this invention is not limited to the said Example, A various deformation | transformation is possible within the range of the summary of this invention. In the above embodiment, the collars 35 and 36 are constituted by separate members from the pole cores 22 and 23. However, as shown in Fig. 3, the pole core 22A on one side and the collar 35A as a part thereof are integrally formed. The pole core 23A on the other side and the collar 36A as a part thereof can be integrally formed.

Conventionally, the pole core is manufactured by cold forging in consideration of mass production. For this reason, it is possible to add the integrated collar 35A and 36A as a part to pole cores 22A and 23A only by changing the shape of the mold used for cold forging. As a result, a new cost down can be achieved by reducing the number of parts.

In the above embodiment, two collars 35 and 36 and two pairs of grooves 37 and 38 are provided at both ends of the pole cores 22 and 23 in the axial direction, but the pulley 9 side has a nut ( 91 can prevent the movement of the pole cores 22 and 23 in the axial direction, so that the plurality of grooves 37 on the pulley 9 side can be omitted.

In the modified example shown in Fig. 3, both collars 35A and 36A are integrally formed with the pole cores 22A and 23A, but only one of the collars can be integrally formed with the pole core.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing the overall configuration of an automotive alternator of an embodiment;

2 is a cross-sectional view of the rotor.

3 is a cross-sectional view of the rotor incorporating a collar and a pole core.

* Description of the major symbols in the drawings *

1: vehicle alternator

2: rotor

3: stator

4: Front side frame

5: rear side frame

6: brush device

7: stop value

8: Voltage regulator

9: pulley

10: rear cover

21: field coil

22, 22A, 23, 23A: Pole Core

24: axis of rotation

25, 26: cooling fan

35, 35A, 36, 36A: color

37, 38, 39, 40: multiple homes

91: Nut

Claims (4)

A pole core having a through hole formed therein; An annular member disposed in contact with an axial cross section of the pole core; And A rotating shaft having a plurality of grooves formed in a direction orthogonal to the axial direction, The annular member and the plurality of grooves are disposed to face each other, and the annular member and the plurality of grooves are joined by pressing and deforming the annular member from an outer peripheral portion. Rotor of vehicle alternator. The method of claim 1, The annular member is provided with two corresponding to each of the axial end surface of the pole core, the plurality of grooves provided on the rotating shaft is provided with at least two pairs corresponding to each of the two annular member, characterized in that Rotor of vehicle alternator. The method according to claim 1 or 2, The rotating shaft is provided with a plurality of grooves in the axial direction at a position corresponding to the through hole of the pole core. Rotor of vehicle alternator. The method according to any one of claims 1 to 3, At least one side of the two annular member is characterized in that formed integrally with the pole core Rotor of vehicle alternator.

Images