JP2009261056A - Rotor for vehicle alternator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for vehicle alternator which improves the yield, reduce the processing cost, and improve the fixing force of a pole core. <P>SOLUTION: The rotor 2 includes pole cores 22 and 23, which are provided with through-holes, collars 35 and 36, which are arranged while contacting with the axial end faces of the pole cores 22 and 23, and a rotating shaft 24, which includes a plurality of grooves 37 and 38 formed in a direction orthogonal to the axial direction. The collars 35 and 36 and the plurality of grooves 37 and 38 are counterposed to each other, and also the collars 35 and 36 and the plurality of grooves 37 and 38 are coupled with each other by pressing and transforming the collars 35 and 36 from their peripheries. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor of a vehicle AC generator mounted on a passenger car, a truck, or the like.

  The rotor of the vehicle alternator is provided with a cylindrical stepped portion having an outer diameter larger than the inner diameter of the pole core while preventing the movement of the pole core in the rotating direction by providing an axial groove on the outer periphery of the rotating shaft. By providing the rotary shaft, movement in the axial direction is prevented (for example, see Patent Document 1).

As another method, a plurality of grooves in the direction orthogonal to the axial direction are provided at both ends of the axial groove of the rotating shaft, and the surface of the pole core on the side where the cooling fan is fixed is caulked in the axial direction, and the vicinity of the inner diameter of the pole core is partially It is also known to prevent the pole core from moving in the axial direction by deforming it into a plurality of grooves (see, for example, Patent Document 2).
Japanese Patent Laying-Open No. 2007-215294 (FIG. 1) JP 2008-54428 A (FIG. 1)

  By the way, in the rotor disclosed in Patent Document 1, it is necessary to provide a stepped portion on the rotating shaft. Therefore, in order to manufacture the rotating shaft, a material having a large outer diameter is used or a stepped portion is provided. Processing was necessary, and there were problems such as poor material yield or high processing costs.

  Further, in the rotor disclosed in Patent Document 2, the axial movement of the pole core is prevented by applying an axial load to the end face of the pole core and biting into a groove in a direction perpendicular to the rotational axis. The deformation of the meat in the vicinity of the end face of the pole core has a problem that the portion far from the end face becomes smaller, so that it is difficult for the meat to bite into the groove far from the end face of the pole core, and the fixing force in the axial direction of the pole core is reduced.

  The present invention has been created in view of the above points, and an object of the present invention is to provide a vehicular AC generator rotor capable of improving yield, reducing processing costs, and improving pole core fixing force. There is.

  In order to solve the above-described problems, a rotor of a vehicle AC generator according to the present invention includes a pole core provided with a through hole, an annular member disposed in contact with an axial end surface of the pole core, and an axial direction. A rotating shaft having a plurality of grooves formed in a direction orthogonal to the annular member, the annular member and the plurality of grooves are arranged to face each other, and the annular member is annularly pressed by being deformed by pressing from the outer peripheral portion. The member and the plurality of grooves are combined. By pressing and deforming the annular member from the outer peripheral portion, the inner circumferential side meat of the annular member can be uniformly bitten into a plurality of grooves, and these can be combined, so that the fixing force of the pole core can be improved. it can. In addition, since there is no need to provide a stepped portion on the rotating shaft, there is no need to use a material having a large outer diameter or processing to provide the stepped portion, and it is possible to improve the material yield and reduce the processing cost. .

  Further, the annular member described above is provided with two pieces corresponding to each of both end surfaces of the pole core in the axial direction, and the plurality of grooves provided on the rotating shaft are at least corresponding to each of the two annular members. It is desirable to have two sets. Accordingly, it is possible to reliably prevent the axial movement while the pole core is sandwiched from both sides along the axial direction.

  Moreover, it is desirable that the rotating shaft described above has a plurality of axial grooves at positions corresponding to the through holes of the pole core. Thereby, it is possible to reliably prevent the pole core from moving in the rotational direction in addition to the axial direction.

  Moreover, it is desirable that at least one of the two annular members described above is integrally formed with the pole core. Thereby, the further cost reduction by reduction of a number of parts is attained.

  Hereinafter, an AC generator for a vehicle according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall structure of an automotive alternator according to an 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, a rectifier 7, a voltage regulator 8, It includes a pulley 9 and the like.

  The rotor 2 is composed of a pair of pole cores 22 and 23 each having a field winding 21 in which an insulated copper wire is wound in a cylindrical and concentric manner as a field core having a plurality of claws. The structure is sandwiched from both sides through the rotating shaft 24. A cooling fan 25 for discharging the cooling air sucked from the front side in the axial direction and the radial direction is attached and fixed to the end face of the pole core 22 on the front side (pulley 9 side) by welding or the like. Similarly, a cooling fan 26 for discharging the cooling air sucked from the rear side in the radial direction is attached and fixed to the end face of the pole core 23 on the rear side by welding or the like. A detailed structure of the rotor 2, particularly a structure for fixing the pole cores 22 and 23 will be described later.

  The stator 3 includes a stator core 31, a three-phase stator winding 32, and an insulator 33 as an insulating member that electrically insulates between the stator core 31 and the stator winding 32.

  The rectifier 7 is for rectifying the three-phase alternating current that is the output voltage of the three-phase stator winding 32 of the stator 3 to obtain a direct current output, and is a positive-side heat radiating plate fixed at a predetermined interval. And a negative-side heat radiating plate and a plurality of rectifying elements attached to the respective heat radiating plates by soldering or the like.

  The front-side frame 4 and the rear-side frame 5 accommodate the rotor 2 and the stator 3 described above, and the rotor 2 is supported so as to be rotatable around the rotation shaft 24. The stator 3 is disposed outside the pole cores 22 and 23 via a predetermined gap. The stator 3 is fixed by tightening bolts 34 to four support portions 420 provided at equal intervals along the rotation direction of the rotor 2.

  The voltage regulator 8 is for adjusting the output voltage of the vehicular AC generator 1 by controlling the exciting current that flows through the field winding 21, and the output varies depending on the electric load and the power generation amount. Keep the voltage almost constant. The pulley 9 is for transmitting the rotation of the engine (not shown) to the rotor 2 in the vehicular AC generator 1, and a nut 91 is attached to one end (the side opposite to the slip ring) of the rotating shaft 24. Tightened and fixed. A rear cover 10 that protects the brush device 6, the rectifying device 7, and the voltage regulator 8 is attached.

  Next, the fixing structure of the pole cores 22 and 23 of the rotor 2 will be described. FIG. 2 is a cross-sectional view of the rotor 2 and shows an upper half structure with respect to the central axis of the rotating shaft 24. As shown in FIG. 2, the pole cores 22 and 23 are provided with a through hole in the center. These pole cores 22 and 23 are assembled so that two claw-shaped magnetic poles are adjacent to each other in the rotation direction. The collars 35 and 36 are annular members made of a metal material, and are arranged in contact with the respective axial end faces (the side on which the cooling fan 25 or 26 is fixed) of the pole cores 22 and 23 when assembled. The

  The rotation shaft 24 is formed between two sets of grooves 37 and 38 formed in a direction orthogonal to the axial direction and between the two sets of grooves 37 and 38 in a direction parallel to the axial direction. It has the some groove | channels 39 and 40 and the slip rings 41 and 42 formed in the edge part vicinity. In the example shown in FIG. 2, two sets of a plurality of grooves 39 and 40 are provided at positions corresponding to the through holes of the pole cores 22 and 23, but these are continuous to form a plurality of sets of grooves, May be further dispersed to form three or more sets of grooves.

  In the assembled state, the rotor 2 is arranged such that one collar 35 and a plurality of grooves 37 in one set face each other, and the other collar 36 and a plurality of grooves 38 in the other set face each other. Has been placed. After the assembly, the collars 35 and 36 are pressed from the outer peripheral portion and deformed by caulking so that the inner peripheral side meat of the pressing positions of the collars 35 and 36 is bitten into the valley portions of the plurality of grooves 37 and 38. Thus, the collars 35 and 36 and the plurality of grooves 37 and 38 are combined. In this way, since the axial positions of the collars 35 and 36 are fixed, the movement of the pair of pole cores 22 and 23 sandwiched between them can be prevented.

  Further, when the portion where the plurality of grooves 39 and 40 are formed is viewed in the rotation direction, it has a concave and convex shape including a concave portion formed by each groove and a convex portion therebetween, but the outer diameter of this convex portion is the pole core 22, It is set larger than the inner diameter of the through hole provided at the center of the 23. As a result, when the rotary shaft 24 is press-fitted into the through hole at the center of the pole cores 22 and 23, the flesh of the inner peripheral surface of the pole cores 22 and 23 corresponding to the plurality of grooves 39 and 40 is inserted into the plurality of grooves 39 and 40. The pair of pole cores 22 and 23 can be prevented from moving in the rotational direction.

  Thus, in the vehicle alternator 1 of the present embodiment, the collars 35, 36 are pressed from the outer peripheral portion and deformed by caulking, whereby the inner peripheral side meat of the collars 35, 36 is formed into a plurality of grooves 37, 38 can be uniformly bitten and coupled to each other, so that the axial fixing force of the pole cores 22 and 23 can be improved. In addition, since there is no need to provide a stepped portion on the rotating shaft 24, it is not necessary to use a material having a large outer diameter or to provide a stepped portion, which can improve the material yield and reduce the processing cost. Become.

  Further, two collars 35 and 36 are provided corresponding to both end surfaces in the axial direction of the pole cores 22 and 23, and a plurality of grooves 37 and 38 provided on the rotating shaft 24 are provided for the two collars. Since there are at least two sets corresponding to each of 35 and 36, the axial movement of these pole cores 22 and 23 is reliably prevented with the pole cores 22 and 23 sandwiched from both sides along the axial direction. be able to.

  Further, since the rotary shaft 24 has a plurality of grooves 39 and 40 parallel to the axial direction at positions corresponding to the through holes of the pole cores 22 and 23, the pole core can be reliably secured not only in the axial direction but also in the rotational direction. The movement of 22 and 23 can be prevented.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the embodiment described above, the collars 35 and 36 are configured as separate members from the pole cores 22 and 23. However, as shown in FIG. 3, one pole core 22A and a collar 35A as a part thereof are integrally formed and the other The pole core 23A and the collar 36A as a part thereof may be integrally formed. Conventionally, the pole core has been manufactured by cold forging in consideration of mass production. For this reason, it is possible to add the integrated collars 35A and 36A as part of the pole cores 22A and 23A only by changing the shape of the die used for cold forging. Thereby, the further cost reduction by reduction of a number of parts is attained.

  In the above-described embodiment, the two collars 35 and 36 and the two sets of grooves 37 and 38 are provided at both ends in the axial direction of the pole cores 22 and 23, but the pulley 9 side is fastened and fixed by the nut 91. Thus, the movement of the pole cores 22 and 23 along the axial direction can be prevented, and the plurality of grooves 37 on the pulley 9 side may be omitted.

  Further, in the modification shown in FIG. 3, both the collars 35A and 36A are integrally formed with the pole cores 22A and 23A, but only one of the collars may be integrally formed with the pole core.

It is sectional drawing which shows the whole structure of the alternating current generator for vehicles of one Embodiment. It is sectional drawing of a rotor. It is sectional drawing of the rotor which integrated the collar and the pole core.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle alternator 2 Rotor 3 Stator 4 Front side frame 5 Rear side frame 6 Brush device 7 Rectifier 8 Voltage regulator 9 Pulley 10 Rear cover 21 Field winding 22, 22A, 23, 23A Pole core 24 Rotating shaft 25, 26 Cooling fan 35, 35A, 36, 36A Collar 37, 38, 39, 40 Multiple grooves 91 Nut

Claims (4)

A pole core with a through hole;
An annular member disposed in contact with the axial end surface of the pole core;
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 arranged to face each other, and the annular member and the plurality of grooves are joined by pressing and deforming the annular member from the outer peripheral portion. An AC generator rotor for vehicles. In claim 1,
The annular member is provided with two pieces corresponding to each of both end surfaces in the axial direction of the pole core,
The plurality of grooves provided on the rotating shaft are provided with at least two sets corresponding to each of the two annular members. In claim 1 or 2,
The rotating shaft has a plurality of axial grooves at a position corresponding to the through hole of the pole core. In any one of Claims 1-3,
At least one of the two annular members is integrally formed with the pole core.

Images