MXPA99001069A - Alternate current generator for motor vehicles - Google Patents

Abstract

An alternating current generator for a motor vehicle is provided which comprises a wind intersection plate made of insulating material having a guiding section for guiding conductor wires of a stator coil and placed on a circuit board of a rectifier. , and an insulating wall positioned to extend from an outer circumferential edge portion of the wind intersecting plate along an inner wall of the rear bracket to the coil end of a stator coil, a window section is constructed in a position of the insulating wall which is in opposite relation to an outlet opening of the rear bracket, a section to prevent the weld dropping, to prevent the weld drop in the weld between the conductive wire and a conductive terminal, which is formed integrally with the circuit board

Description

ALTERNATE CURRENT GENERATOR FOR MOTOR VEHICLES BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an alternating current generator for a motor vehicle, equipped with a lundell type rotor that is to be attached to a motor of the motor vehicle.

Description of the related art Fig. 5 is a cross-sectional view showing an anterior motor vehicle AC generator, Fig. 6 is an exploded perspective view showing a rectifier to be applied to the previous motor vehicle AC generator. , and Figure 7 is a useful illustration for describing an adjustment state of a stator and the rectifier in the above motor vehicle AC generator. In Figure 5, the above motor vehicle AC generator is constructed such that a lundell-type rotor 7 is rotatably positioned through a shaft 6 within a cover comprising a front bracket 1 and a rear bracket 2. and a stator 13 is fixedly secured to both brackets to cover an outer circumferential side of the rotor 7. The front bracket 1 and the rear bracket 2 are formed in a bowl-like configuration by cast aluminum or the like, with pluralities of openings the, 2a of inlets constructed on their axial directional surfaces while pluralities of outlet openings lb, 2b are constructed in their outer circumferential edge sections along their circumferential directions. The shaft 6 is rotatably connected through the bearings 3, 4 retained by the front bracket 1 and the rear bracket 2. A pulley 5 is fixedly fixed on an end portion of this shaft 6, whereby it transmits a rotational torque of a motor through a band (not shown) to the shaft 6. The rotor 7 is constituted by a coil 8 of rotor to generate a magnetic flux in response to an electric current and a pair of field cores 9, 10 provided to cover the rotor coil 8 to be magnetic poles by the magnetic flux generated by the rotor coil 8. In addition, the fans 11, 12 are fixedly secured to the end portions of the field cores 9, 10 in their axial directions. The stator 13 is constituted by a stator core 14 and a stator coil 15 in which a conductive wire is wound around the stator core 14 to generate an alternating current due to the alternating magnetic flux of the rotor 7 with the rotation of the rotor 7. Furthermore, the lead wires 17, protected respectively by insulating tubes 16, are directed from the coil 15 of the stator. A rectifier 18 is fixedly positioned within the rear bracket 2 and is electrically placed through the lead wires 17 of the stator coil 15 to rectify an alternating current generated in the stator 13, at direct current. This rectifier 18 is composed, as shown in FIG. 6, of a positive heat sink 21 on which positive diodes 20 are mounted, a negative heat sink 23 on which negative diodes 22 and a circuit board 24 are mounted. in which a connection conductor with an insulating resin is molded by insertion. In addition, guiding portions 25a are formed integrally to guide the wires 17 with an insulating resin constituting the wind intersecting plate 25 of the rectifier 18 constituting the flat sections. In addition, the positive heat sink 21, the negative heat sink 23, the circuit board 24 and the wind intersection plate 25 are stacked together in a state to be guided by the guide portions 21a, 23a, 24b and 25b, with a bolt 26 that is inserted into the holes of the guide portions 2la, 23a, 24b and 25b for integral assembly.

Incidentally, an insulating ring 27 is interposed between the guide portions 21a and 23a, so that it insures the insulation between the positive heat sink 21 and the negative heat sink 23. In addition, the conductive terminals 20a of the positive diodes 20, the conductive terminals 22a of the negative diodes 22 and the conductive terminals 24a of the circuit board 24 are located one above the other. The rectifier 18 and the wind intersection plate 25, constructed in this manner, are fixedly fixed to the rear bracket 2 by means of fixing bolts 28 inserted in the holes of the guide portions 21a, 23a, 24b and 25b. In addition, the members 29 that prevent the eolder dropping made of insulating paper are placed on the circuit board 24 so that the conductor terminals 20a, 22a and 24a are placed in the holes 29a thereof, and as shown in FIG. 7, the lead wires 17 of the stator coil 15 are guided by the guide portions 25a to be directed to a connection section with the rectifier 18 and are welded to the stacked conductive terminals 20a, 22a and 24a, thereby ensuring a electrical connection between the stator coil 15 and the rectifier 18. In the above motor vehicle AC generator constructed in this way, a current is fed from a battery (not shown) to the rotor coil 8, so that the generates a magnetic flux Due to this magnetic flux, the pole-like magnetic pole portions of a field core 9 are magnetized to N polarities, while the hook-like magnetic pole portions of the other field core are magnetized to S-polarized. , the rotational torque of the motor is transferred through the belt and the pulley 5 to the shaft 6, which causes the rotor 7 to rotate. Therefore, a rotational magnetic field is provided to the stator coil 15 so that an electromotive force takes place in the coil 15 of the stator. This electromotive force of alternating current passes through the rectifier 18 to be rectified in direct current, its value is regulated by a voltage regulator (not shown) and the battery is charged. Further, on the front side, the fan 11 rotates so that cooling air is sucked from the openings of the inlet of the front bracket 1 to cool the bearing 3, the field core 9, the rotor coil 8, the core 14 of the stator and the stator coil 15, and then discharged through the outlet openings lb towards the outside. While on the back side, due to the rotation of the fan 12, the cooling air is sucked from the inlet openings 2a of the rear bracket 2 to cool the bearing 4, the rectifier 18, the field core 10, the coil 8 of the rotor, the stator core 14 and the stator coil 15, and then discharged through the outlet openings 2b to the outside. In prior motor vehicle AC generators constructed in this way, although the insulating tubes 16 5 are placed on the conductor wires 17 of the stator coil 15 for the protection of the conductor wires 17 in isolation from a side wall of the rear bracket 2, the specificity of this configuration makes it difficult to perform the mechanization of the wire insertion work 17 conductors inside the insulating tubes 16, in addition to the insulating tubes 16 remaining outside the assembly. As an example of an opposite measurement, up to now a conventional apparatus has been proposed in which an insulating wall with the intersection plate 25 is integrally provided. of wind to maintain the insulation of the conductor wires 17 of a side wall of the rear bracket 2, which allows the insulating tubes 16 to be omitted. However, in this conventional apparatus, some outlet openings 2b made in the rear bracket 2 are covered with the wall insulating so that the cooling air taken through the inlet openings 2a can not be discharged in a regular manner, which generates a problem of decreased cooling efficiency. In addition, since the members 29 that avoid drops of The welding is placed between the wires 17 and the circuit board 24 to prevent the fall due to vibrations or the like in a state where the conductor terminals 20a, 22a and 24a penetrate the holes 29a, there is a problem in that the facilitation the assembly becomes extremely serious. Further, since the members 29 that prevent the weld drop protrude inwardly in the radial directions of the circuit board 24 for the purpose of improving the assembly work efficiency, they become larger than necessary and therefore block the cooling air flow and therefore lead to a decreased efficiency in cooling.

BRIEF DESCRIPTION OF THE INVENTION Accordingly, the present invention has been developed with the aim of eliminating the problems mentioned above, and it is an object of this invention to provide an alternating current generator for a motor vehicle which is capable of ensuring an appropriate flow of cooling air. to suppress the decline in cooling efficiency and to improve assembly ease in a manner that an insulating wall is integrally provided with a wind intersecting plate running along the interior wall of a rear bracket, a window section and the insulating wall to conform to an outlet opening and a member is placed to prevent welding integrally on a circuit board. In order to obtain the above objective, according to one aspect of the invention, there is provided an alternating current generator for a motor vehicle comprising a rectifier placed inside a rear bracket, the wind intersection plate made of material insulator having a guide section for guiding conductive wires of a stator coil and which are placed on a rectifier circuit board and an insulating wall positioned to extend from an outer circumferential edge portion of the wind intersecting plate to the length of the inner wall of the rear bracket to a coil end of the stator coil, with a lead wire passing through the guide section to be welded to the conductive terminals of the rectifier, wherein the window section is builds in a position of the insulating wall which is in opposite relation to an exit opening of the rear bracket, a section which imitates the weld drop to prevent weld dropping in the weld between the conductive wire and the conducting terminal that is formed integrally with the circuit board.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an alternating current generator for a motor vehicle according to a first embodiment of the present invention; Figure 2 is an exploded perspective view showing a rectifier for use in the motor vehicle AC generator according to the first embodiment of this invention, - Figure 3 is a useful illustration for explaining an adjustment state of a stator and a rectifier in the motor vehicle AC generator, according to the first embodiment of this invention; Figure 4 is a useful illustration for explaining an adjustment state of a stator and rectifier in the motor vehicle AC generator, according to a second embodiment of this invention, - Figure 5 is a cross-sectional view shows an anterior alternating current generator, for a motor vehicle, - figure 6 is an exploded perspective view showing a rectifier to be applied to the previous motor vehicle AC generator, - and figure 7 is an illustration to describe a setting adjustment of a stator and a rectifier in the above motor vehicle AC generator.

DETAILED DESCRIPTION OF THE INVENTION The embodiments of the present invention will now be described with reference to the drawings.

First mode Fig. 1 is a cross-sectional view showing an alternating current generator for a motor vehicle according to a first embodiment of the present invention, Fig. 2 is an exploded perspective view showing a rectifier for use in the generator AC motor vehicle, in accordance with the first embodiment of this invention, and FIG. 3 is a useful illustration for explaining an adjustment state of an eetator and a rectifier in the AC generator of the motor vehicle, according to the first embodiment of this invention. In Figures 1 to 3, the rectifier 30 is constituted by a positive heat sink 21 on which the positive diodes 20 are mounted, and a negative heat sink 23 on which the negative diodes 22 are mounted, and a board 31 of circuit in which a connection conductor is molded by insertion, with an insulating resin. The portions 32 for preventing the weld drop are formed integrally with that circuit board 31. In addition, guide portions 33a for guiding leads 17 are integrally manufactured with a wind intersection plate 33 made of implant resin, of rectifier 30 which constitutes a planar section. In addition, an insulating wall 34 made of insulating resin is formed integrally with the wind intersecting plate 33 to extend from an outer circumferential end portion of a flat section of the wind intersecting plate 33 along an inner wall of a rear bracket 2 to a coil end of a stator coil 15. Additionally, each of the window portions 34a has a rectangular configuration equivalent to that of the outlet openings 2b which are fabricated at positions in the insulating wall 34 which are in an openable relationship to the outlet openings 2b. In addition, the positive heat sink 21, the negative heat sink 23, the circuit board 31 and the wind intersection plate 33 are stacked together in a state that is guided by the guide portions 21a, 23a, 24b and 33b and a bolt 26 is inserted into the holes of the guide portions 21a, 23a, 24b and 33b under pressure, whereby an integral assembly is produced. In addition, the conductive terminals 20a of the positive diodes 20 and the conductive terminals 22a of the negative diodes 22 are inserted into the holes 32a of the portion 32 to prevent weld dropping and are stacked on the conductive terminals 31a of the circuit board 31 . Incidentally, the other construction is similar to that of the motor vehicle AC generator shown in Figs. 5 to 7. The rectifier 30 and the wind intersection plate 33 constructed in this manner are fixedly tightened through a bolt 28. of fixing inserted in the holes of the guide portions 21a, 23a, 24b and 33b. In addition, the lead wires 17 of the stator coil 15 are guided by the guide portions 33a to be directed to a connection section with the rectifier 30 and welded to the stacked conductive terminals 20a, 22a and 31a, thereby ensuring a electrical connection between the stator coil 15 and the rectifier 30. Additionally, the insulating wall 34 is positioned to extend from an outer circumferential end portion of the flat or uniform section of the wind intersection plate 33 along the wall interior of the bracket 2 rear to the coil end of the stator coil 15. In addition, the window portions 34a are in opposite relation to the exit openings 2b of the rear bracket 2. According to the first embodiment, since the insulating wall 34 is positioned to extend from an outer circumferential end portion of the flat section of the wind intersection plate 33 along the inner wall of the bracket 2 back to the end coil winding 15 stator, the wires 17 of the stator coil 15 are electrically isolated from the rear bracket 2 by means of the insulating wall 34, with the result that the insulating tubes 16 which have been required for this, can be omitted. Accordingly, it is possible to eliminate the insertion work of the wires 17 in the insulating tubes 16 and the detachment of the insulating tubes 16 in the assembly, which reduces the number of parts and improves the ease of assembly. Further, since the window portions 34a are in opposite relation to the outlet openings 2b, of the rear bracket 2, the cooling air is sucked from the inlet openings of the rear bracket 2 and can be discharged regularly through of the outlet openings 2b, whereby the decrease in cooling efficiency and resulting from the installation of the insulating wall 34 is suppressed. In addition, since the portions 32 that prevent weld dropping are integrally formed by the circuit board 31, it is possible to eliminate the need for installation of the members 29 that prevent weld dropping which reduces the number of parts and improves the ease of assembly and cooling efficiency.

Second modality In the second embodiment, as shown in Figure 4, guide portions 34b are formed to guide the wires 17, on the insulating wall 34. The exterior construction is designed to be identical to that of the first embodiment described above. According to the second embodiment, since the guiding portions 34b for guiding the wires 17 are formed on the insulating wall 34, it is possible to guide the lead wires 17 more easily and accurately to the connection section, and therefore to improve additionally the efficiency of assembly work. Furthermore, although in each of the embodiments described in the above window portions 34a are formed within a rectangular configuration, the shape of the window portion 34a is not limited to a rectangle, but it is also acceptable to assume an elongated ellipse. , an inverted triangle or similar. In accordance with this invention, there is provided an alternating current generator for a motor vehicle comprising a rectifier fitted within a traverse bracket, a wind intersection plate made of insulating material having a guiding section for guiding conductor wires. a stator coil and placed on a circuit board of the rectifier, and an insulating wall positioned to extend from an outer circumferential edge portion of the wind intersecting plate along an inner wall of the rear bracket to an end of coil of the stator coil, wherein the conductor wire passes through the guide section to be welded to the conductor terminals of the rectifier, where a window section is constructed in a position of the insulating wall which is in opposite relation to an exit opening of the rear bracket and a section to avoid the weld drop, to avoid the Solder drop in the solder between the conductive wire and the conductive terminal that is formed integrally with the circuit board. Therefore, it is possible to provide an alternating current generator for a motor vehicle which is capable of removing the insulating tubes and limbs to prevent weld dropping which had now been necessary, and to suppress the flow deterioration of the cooling air caused by the installation of the air wall and therefore to improve the efficiency of assembly work and cooling efficiency.

Claims (1)

1. An AC generator for a motor vehicle, characterized in that it comprises-. a rectifier placed inside a rear bracket, - a wind intersection plate made of insulating material having a guiding section for guiding conductor wires of a stator coil and placed on a rectifier circuit board, - and an insulating wall positioned to extend from an outer circumferential edge portion of the wind intersecting plate along the inner wall of the rear bracket to a coil end of the stator coil, the conductive wire passes through the guide section to be welded to the conductive terminals of the rectifier, wherein a window section is constructed in a position of the insulating wall which is in opposite relation to the outlet opening of the rear bracket and a section to prevent weld dropping, to avoid weld dropping in the weld between the conductive wire and the conducting terminal, which is integrally formed on the board of circuit.