JPH08205496A - Rotor of ac generator for vehicle - Google Patents

Abstract

PURPOSE: To insulate a terminal wire of a field coil from a pole core and a centrifugal fan for cooling and eliminate an insulation tube by integrally forming a cylindrical portion to the area where a projection for finishing the terminal wire of a field coil of the external circumference of a bobbin is formed. CONSTITUTION: A terminal wire 10a of a field coil 10 is finished to a projection 11a formed at the external circumference of a bobbin 11 located between pawl- type poles of a pole core 9 and thereafter it is inserted into a cylindrical portion 11b integrally formed in the side of a slip ring 12 of the bobbin 11. The terminal wire 10a of field coil inserted into the cylindrical portion 11b of bobbin is fallen toward the internal diameter side from the area between the pawl-type poles of the pole core 9 and a terminal portion of the cylindrical part of bobbin is held between the projection 12a provided at the rear surface of the pole core 9 of the slip ring 12 and the pole core 9. Thereby, assembling of rotor can be automated easily and productivity can also be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a vehicle alternator.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Laid-Open No. 60-73367, a rotor of a conventional vehicle alternator has a field coil terminal wire sandwiched between a pair of pole cores fixed to a shaft. After entwining it with the protrusion that is integrally molded on the outer periphery of the resin bobbin that insulates the pole core and the field coil, insert the insulating tube into the terminal wire, fold it over the pole core, and then cool it down on the pole core. It is sandwiched between the pole core and the pole core, and is connected to the lead wire of the slip ring fixed to one end of the shaft.

[0003]

According to the prior art, the field coil terminal wire of the rotor of the vehicle alternator is electrically insulated from the pole core and the cooling centrifugal fan by the field coil terminal wire. Is inserted into the insulating tube. Usually, the outer diameter of the terminal wire of the field coil is 0.5 to 1.0.
Since the insulating tube has an inner diameter of 1.0 mm and an inner diameter of 1.0 to 1.2 mm, it is very difficult to insert the insulating tube, which is a factor that hinders automation of assembly.

An object of the present invention is to provide a terminal wire insulation structure for a rotor of an automotive alternator which has good productivity.

[0005]

The above-mentioned object is to integrally form a cylindrical shape on a bobbin of an automotive alternator at the same portion as the terminal wire entanglement protrusion of the field coil on the outer periphery of the bobbin. Achieved by

[0006]

According to the present invention, the field coil terminal wire having a small wire diameter is not inserted into the insulating tube having a small inner diameter,
Since the terminal wire of the field coil can be insulated from the pole core and the cooling centrifugal fan, and the insulating tube can be eliminated, the productivity can be improved and the cost can be reduced.

[0007]

Embodiments of the present invention will be described below.

FIG. 1 shows a cross-sectional shape of an automotive alternator to which the present invention is applied. A pair of bowl-shaped end frames 1 and 2 forming a housing of the AC generator sandwich a stator core 4 having a stator coil 3 at an opening and are fixed to each other by a plurality of bolts 5 not shown. Cylindrical bearing boxes projecting toward the inside of the generator are formed in the center of the side surfaces of both end frames 1 and 2, bearings 6 and 7 are attached respectively, and a pair of pole cores 8 and 9 having a plurality of claw-shaped magnetic poles. Field coil 1 sandwiched between
0, a resin bobbin 11 for insulating the pole cores 8 and 9 from the field coil 10, and a rotor 13 having a slip ring 12 electrically connected to the field coil 10. Are rotatably supported by bearings 6 and 7. On both end faces of the rotor 13,
The front side cooling centrifugal fan 15 and the rear side cooling centrifugal fan 16 are fixed. Inside the rear-side end frame 2, the brush holder 17, the rectifying device 18, the regulator 19, and the fan guide 20 are installed.
It is fixed by 1. The pulley 22 is fastened and fixed by a nut 23 to one end of the shaft 14 outside the end frame 1 and the bearing 6.

2 to 4 show details of the insulation structure of the field coil terminal wire of the rotor of the vehicle alternator according to the present invention. The terminal wire 10 a of the field coil 10 is connected to the pole core 9
After being entangled with the protrusion 11a formed on the outer circumference of the bobbin 11 located between the claw-shaped magnetic poles of the claw-shaped magnetic poles, the bobbin 11 is inserted into the cylindrical portion 11b integrally formed on the slip ring 12 side. The cylindrical portion 11b of the bobbin is provided with a slit for inserting the field coil terminal wire 10a over the entire area.
Here, the wire diameter of the field coil terminal wire 10a is D1, the inner diameter of the cylindrical portion 11b of the bobbin is D2, and the minimum width of the slit provided in the cylindrical portion 11b of the bobbin is H. In this embodiment,
As D1> H and D1 <D2, the field coil terminal wire 10a
The insertion into the bobbin cylindrical portion 11b is made into a snap fit to prevent the field coil terminal wire 10a after insertion from coming off. The field coil terminal wire 10a inserted into the cylindrical portion 11b of the bobbin is tilted toward the inner diameter side from between the claw-shaped magnetic poles of the pole core 9, and the terminal portion of the cylindrical portion of the bobbin is located on the pole core 9 side of the slip ring 12. Protrusion 1 on the back
It is sandwiched between 2a and the pole core 9. At the end of the cylindrical part of the bobbin, there is a protrusion that protrudes more than the tunnel part of the cooling centrifugal fan inside the inner diameter of the tunnel part provided in the cooling centrifugal fan to prevent it from popping out by centrifugal force. It has a structure that The base of the cylindrical portion 11b of the bobbin has a thin flat plate shape, and has a structure that can be easily collapsed. In addition, the field coil terminal wire 10a is connected to the bobbin cylindrical portion 1
The clearance when inserted in 1b is d1, the cooling centrifugal fan 16
When the distance between the pole core 9 and the cooling centrifugal fan 16 before the fixing of the pole core 9 to the pole core 9 is d2, d2> d
By setting the value to 1, when the cooling centrifugal fan 16 is fixed to the pole core 9, d1 is always 0, and the field coil terminal wire 10a is located between the pole core 9 and the tunnel portion 16a provided in the cooling centrifugal fan 15. Then, the bobbin cylindrical portion 11
It is sandwiched in the state of being wrapped in b. The terminal wire entanglement protrusion portion on the outer peripheral portion of the bobbin and the terminal wire insertion cylinder portion are installed offset to the left and right, and the slit provided in the cylinder portion is the terminal wire entanglement protrusion portion. It is installed on the opposite side and has a structure that prevents the terminal wire from being entangled during the insertion process.

[0010]

According to the present invention, by inserting the terminal wire of the field coil of the rotor of the vehicle alternator into the cylindrical portion integrally formed on the outer peripheral portion of the bobbin, the field coil terminal wire is inserted. Since it is possible to electrically insulate the pole core and the centrifugal fan for cooling without using an insulating tube, it is possible to easily automate the assembly of the rotor and improve the productivity. it can. Further, since the field coil terminal wire can be reliably fixed on the pole core, the step of joining the pole coil to the pole core with varnish or the like can be omitted, and the centrifugal force resistance performance can be improved. Furthermore, since the insulating tube can be eliminated, the cost can be reduced by reducing the number of parts.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an automotive alternator of the present invention.

FIG. 2 is a partial cross-sectional view of a field coil terminal wire portion of the vehicle alternator of the present invention.

FIG. 3 is a sectional view of a cooling fan tunnel portion of the vehicle AC generator of the present invention.

FIG. 4 is a side view of the bobbin outer periphery of the vehicle AC generator of the present invention.

FIG. 5 is a perspective view of a cylindrical portion on the outer circumference of the bobbin of the vehicle alternator of the present invention.

[Explanation of symbols]

8, 9 ... Pole core, 10 ... Field coil, 10a ... Field coil end wire, 11 ... Bobbin, 11a ... Bobbin end wire entanglement protrusion, 11b ... Bobbin outer peripheral cylindrical portion, 12 ... Slip ring, 12a ... Slip ring Back projection, 12b ...
Slip ring lead wire, 14 ... Shaft, 16 ... Centrifugal fan for cooling.

Claims (8)

[Claims] 1. A shaft rotatably supported, a pair of pole cores having a plurality of claw-shaped magnetic poles fixed to the shaft, a field coil sandwiched between the pair of pole cores, the pole core and the field. A resin bobbin for insulating a magnetic coil, a slip ring electrically connected to the field coil and fixed to one end of the shaft, and a cooling centrifugal fan mechanically fixed on the pole core. In the rotor of the vehicle alternator described above, between the claw-shaped magnetic poles of the pole core, the end wires of the winding start and end of the field coil are connected to the projections for wrapping the end wires on the outer peripheral portion of the bobbin. It is inserted into a cylindrical part integrally formed with the same part as the above part, is laid down on the pole core, and is electrically connected to the lead wire of the slip ring. The rotor of the machine. 2. The rotor for an automotive alternator according to claim 1, wherein a base of a cylindrical portion integrally formed with the outer peripheral portion of the bobbin has a thin flat plate shape. 3. The cylinder according to claim 1, wherein a tip of the cylindrical portion integrally formed with the outer peripheral portion of the bobbin has a flat plate shape, and when the cylindrical portion of the bobbin is laid down on the pole core, A rotor for an alternator for a vehicle, wherein a flat plate portion at a tip of the portion is sandwiched between the slip ring and the pole core. 4. The vehicle alternator according to claim 1, wherein a slit for inserting a terminal wire of the field coil is provided in the entire area of the cylindrical portion integrally formed on the outer peripheral portion of the bobbin. Rotor. 5. The vehicle alternator according to claim 4, wherein the minimum width of the slit provided in the cylindrical portion integrally formed on the outer peripheral portion of the bobbin is smaller than the wire diameter of the terminal wire of the field coil. Rotor. 6. A cylindrical portion integrally formed on an outer peripheral portion of the bobbin and a terminal wire entanglement projection portion of the field coil on the outer peripheral portion of the bobbin are offset left and right according to claim 4, A rotor for an alternator for a vehicle, wherein an opening of a slit provided in a cylindrical portion on the outer circumference of the bobbin is provided on the opposite side of the outer wire of the bobbin from the terminal wire entanglement projection. 7. The method according to claim 1, wherein a tunnel shape is provided on a contact surface of the cooling centrifugal fan mechanically fixed on the pole core with the pole core, and a terminal wire of the field coil is connected to the bobbin. A tunnel-shaped portion that is inserted into a cylindrical portion that is integrally formed on the outer peripheral portion and that is provided on a contact surface of the cooling centrifugal fan with the pole core, and a rotor of a vehicle AC generator that is sandwiched by the pole core. 8. The cooling centrifugal fan mechanically fixed on the pole core at a tip end of a cylindrical portion integrally formed on an outer peripheral portion of the bobbin, the contact surface being in contact with the pole core. A rotor for an alternator for a vehicle, wherein a protrusion protruding toward the cooling fan is provided inside the inner diameter of the tunnel-shaped portion.