JPH06133509A - Rotating electric machine incorporating commutator - Google Patents

Abstract

PURPOSE:To provide an electric rotating machine incorporating a commutator which has high durability against repetitive vibration or thermal stress and equipped with a commutator assembly structure allowing reduction of the number of components or assembly manpowers. CONSTITUTION:A - side commutator device 5b is secured directly to the frame 12 so that - side cooling fins and accommodating space therefor are saved. A bush 53 is formed integrally at the peripheral part of a fixing hole for + side cooling fins 51 to which a + side commutator device is secured. The bush 53 spaces the frame 12 apart from the + side cooling fins 51 by a predetermined distance while spaces a resin cover 4 apart from the + side cooling fins 51 by a predetermined distance and entirely covers the inner peripheral surface of the fixing hole for the + side cooling fins 51. Consequently, the bush 53 ensures dielectric performance between the + side cooling fins 51 and the frame 12, positions the resin cover 4 with respect to the frame 12, and electrically insulates the + side cooling fins 51 from a clamping member (bolt) 55.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectifier for an automotive alternator. -The fin is integrated with the frame to cover it.
By using resin as the resin, the surface of the + fin requiring insulation can be reduced to one place, and the size can be reduced. AC generator for vehicles.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional three-phase AC generator for vehicles with a built-in rectifier. The three-phase full-wave rectifier is the rear frame 100.
And the component storage chamber S between the cover 101 and the cover 101. A pipe rivet 103 is fitted to a bolt 102 that is erected from the rear frame 100, and the pipe rivet 1
03, the bush 104, the + side cooling fin 105, the bush 106, and the − side cooling fin 107 are fitted in order, and then the bolt 102 is fitted with the mounting hole of the cover 101 and fastened with the nut 108. . +
A positive side rectifying element (not shown) is provided on the side cooling fin 105,
A − side rectifying element (not shown) is fixed to the − side cooling fin 107.

As a result, the positive side cooling fins 105 and the negative side cooling fins 107 are separated from each other and from the frame 100 and the bolts 102, and the cover 101 is fixed at a predetermined distance from the frame 100. The pipe rivet 101 also serves as the ground electrode of the-side cooling fin 107, and these bushes 104, 106 are also provided.
And each fin 105, 107 is caulked and fixed.

[0004]

However, in the above-described rectifier, the pipe rivet 103 is provided in each bush 10.
Since the fins 104 and 106 and the fins 105 and 107 are fixed by caulking, the bushes 104 and 106 may be thermally contracted and loosened due to repeated vibration and heat stress.

Further, the rectifier assembly structure described above requires a large number of parts, and the assembly requires fine manual work.
There was a problem that automation was not easy. The present invention has been made in view of the above problems, and has a rectifier built-in rotating electric machine having a rectifier assembly structure that is highly durable against repeated vibration and heat stress and that can reduce the number of parts and the number of assembly steps. Its purpose is to provide.

[0006]

A rotary electric machine with a built-in rectifier according to the present invention is a full-wave rectifier fixed to the outer end face of a frame by connecting a negative rectifier element and a positive rectifier element, and a fixed rectifier fixed to the frame. A resin cover surrounding the full-wave rectifier, wherein the-side rectifying element is a rectifier-equipped rotary electric machine in which the-side terminal is directly fixed to an outer end surface of the frame so that the-side terminal can conduct to the frame, A + side cooling fin that supports a side rectifying element and constitutes a + side terminal of the full-wave rectifier, a bush integrally formed with resin around a mounting hole of the + side cooling fin, and a mounting hole for the resin cover. And a metal fastening member that penetrates through the mounting hole of the + side cooling fin and fixes the resin cover and the + side cooling fin to the frame, and the resin bush is the flare. And the + side cooling fin are separated from each other at a predetermined interval, the resin cover and the + side cooling fin are separated from each other at a predetermined interval, and the inner peripheral surface of the mounting hole of the + side cooling fin is It is characterized by covering the entire surface.

In a preferred mode, the resin bush includes a sleeve made of metal which is inserted and fixed in the attachment hole of the + side cooling fin by the integral formation.

[0008]

In the present invention, the-side rectifying element is-
The side terminal is directly fixed to the outer end surface of the frame so as to be able to conduct to the frame, whereby the − side cooling fin and the accommodation space thereof are omitted. A resin bush is integrally formed around the mounting hole of the + side cooling fin to which the + side rectifying element is fixed, and the resin bush separates the frame and the + side cooling fin at a predetermined interval to form a resin cover. The + side cooling fins are separated from each other by a predetermined distance, and the entire inner peripheral surface of the mounting hole of the + side cooling fins is covered.

Thus, the resin bush secures the electrical insulation performance between the + side cooling fin and the frame, positions the resin cover with respect to the frame, and reliably electrically insulates the + side cooling fin from the bolt. Further, the + side cooling fin can be securely fixed only by sandwiching the bush between the resin cover and the frame without caulking with a pipe rivet as in the conventional case. That is, since it is not necessary to strongly crimp a partial area of each of these parts with pipe rivets in order to fix a large number of parts as in the conventional case, the bush is less likely to undergo heat contraction due to repeated vibration and heat stress. ,
The durability against rattling is improved.

Further, the number of parts and the number of assembling steps can be remarkably reduced, and the automation becomes extremely easy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A vehicle alternator according to an embodiment of the present invention will be described with reference to FIG. First, the basic configuration of this generator will be outlined. The frame 1 including the front frame 11 and the rear frame 12 is fastened with a plurality of fastening bolts 13,
The frame 1 rotatably supports a rotary shaft 2, a Lundell type field iron core 31 is fixed to the rotary shaft 2, and a field coil 32 is wound around the field iron core 31. An armature core 33 is fixed to the inner peripheral surface of the frame 1 so as to surround the field core 31, and an armature coil 34 is wound around the armature core 33.

A resin cover 4 is fixed so as to surround the rear end surface of the rear frame 12, and an electric component chamber S is formed between the rear frame 12 and the resin cover 4. In the electric component room S, a brush 8 and a regulator 9 for adjusting the exciting current are housed in addition to the rectifying device 5 for rectifying the generated voltage, which is the feature of this embodiment. When the engine drives the rotating shaft 2 through the pulley 21 and the brush 8 energizes the field coil 32 through the slip ring 81 to excite the field coil 32, the three-phase AC voltage generated in the armature coil 34 is generated in the rectifier 5. Three-phase full-wave rectified and output.

The characteristic part of this embodiment will be described below with reference to the sectional view shown in FIG. 1, the front view after removing the resin cover 4 shown in FIG. 2 and the exploded perspective view shown in FIG. The rectifying device 5 is a three-phase full-wave rectifying bridge, and is formed by connecting four + side rectifying elements 5a and four-side rectifying elements 5b shown in FIG. 2 in a bridge connection. The − side rectifying element 5b has a can-shaped + pole and a − terminal protruding from the center of the end face, and is press-fitted into a hole penetrating the rear frame 12. The + side rectifying element 5 a has a can-shaped − pole and a + terminal protruding from the end face center, and is fixed to the + side cooling fin 51. + Side cooling fin 51
Acts as a conductive path and heat sink.

Three through-holes in the + side cooling fin 51 (see FIG. 1)
52 are opened, and resin bushes 53 are individually formed in the vicinity of each through hole 52 by resin integral molding. Each resin bush 53 has a steel sleeve 54 integrally molded with the resin.
It penetrates through hole 52 of side cooling fin 51. Also,
The resin bush 53 includes a sleeve 54 and a + side cooling fin 51.
It is filled in the gap between and to electrically insulate the two.

On the other hand, a bolt 55 is press-fitted into the through-hole 18 for press-fitting the bolt formed in the rear frame 12, and the bolt 55 is integrally formed of the + side cooling fin 51, the resin bush 53 and the sleeve 54. The molded product is fitted. Further, a through hole for fastening is opened in the resin cover 4, the bolt 55 penetrates this through hole of the resin cover 4 after inserting the sleeve 54, and then the nut 56 is fastened to the bolt. Resin cover 4 and resin bush 53 (and sleeve 54 and + side cooling fin 5)
1) is fastened and fixed. As shown in FIG. 1, the rear end of the sleeve 54 is fitted into the through hole of the resin cover 4 but does not reach the nut 56. On the other hand, the front end of the sleeve 54 has a collar portion and has a rear frame. 12 is in contact with the rear end surface.

Therefore, by fastening the bolts 55 and the nuts 56, the front end surface of the resin bush 53 comes into contact with the rear frame 12 and the rear end surface thereof comes into contact with the resin cover 4, whereby the resin bush 53 becomes the + side cooling fin 51. A gap required for electrical insulation and good air cooling is secured between the rear frame 12 and the rear frame 12, and a gap required for good air cooling is secured between the + side cooling fin 51 and the resin cover 4. be able to. The cooling air required for air cooling is formed by the cooling fan 19, and the + side cooling fins 51 are provided with elongated ventilation holes 57 as shown in FIGS.

Further, as shown in FIG. 1, the resin bush 53 is formed so as to completely surround the periphery of the + side cooling fin 51 in the vicinity of the through hole 52. By doing so, the strength of the resin bush 53 is improved. Also, the rear frame 1
2 is raised to the rear side in the vicinity of the through hole 52 of the + side cooling fin 51 for supporting the bolt 55,
For that reason, electric leakage is likely to occur between the rear frame 12 and the + side cooling fin 51, but since the resin bush 53 completely surrounds the + side cooling fin 51 at this portion, the + side cooling fin 51 is formed. Are well electrically isolated from the rear frame 12.

The positive terminal of the negative rectifying element 5b is soldered to the positive terminal of the positive rectifying element 5a via a cable before assembly. Reference numeral 58 is a connection terminal for connecting the four stator coil leads 6 extending from the output end of the three-phase armature coil 34, and is resin-insulated from the rear frame 12 through the through hole in the rear end surface of the rear frame 12. While exposed. A pair of negative terminals of the negative rectifier 5b and positive terminals of the positive rectifier 5a are connected to the connection terminals 58, respectively. The DC output terminal 59 of the rectifier is caulked and fixed to the + side cooling fin 51.

Further, the plus side rectifying element 5 is connected by the resin bush 53.
It is also possible to shield the opening of the through hole for press-fitting a on the side of the rear frame 12, and a terminal having a hole is provided in this shielding portion of the resin bush 53, and the + side rectifying element 5a is provided in this terminal hole. + Terminal can be inserted and soldered. The cable extending from the terminal can be integrally molded with the terminal. This cable is connected to the minus side rectifying element 5b as shown in FIG.
, And the connection terminal 58. In this way, the connection becomes easy.

Further, each resin bush 53 can be integrally molded. Assembling of the rectifying device is as follows. First, the low-side rectifying element 5b is press-fitted into the frame 12, then the integrally molded product of the resin bush 53 is fixed with the bolt 55 and the nut 56, and then the lead of each rectifying element 5a, 5b. And the stator coil leads 6 are connected to complete the process.

Therefore, according to the rectifying device of this embodiment described above, the following effects can be obtained. Since the + side cooling fin 51 and the sleeve 54 are integrally molded by the resin bush 53 having the above-described shape, they are resistant to vibration and heat stress, and the + side cooling fin 51 can be well insulated and cooled. As described above, it is possible to realize a built-in rectifier having a reduced number of parts and excellent assemblability.

Further, the minus side rectifying element 5b is the rear frame 1
Since it is press-fitted in No. 2, it is not necessary to stack the + side cooling fin 51 and the − side cooling fin as in the conventional case, and it is possible to reduce the required space space and to cool the + side cooling fin 51 well. it can. Further, the work of connecting the ground side of the negative side rectifying element 5b and the connecting member can be omitted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vehicle AC generator according to an embodiment,

2 is a front view of the generator of FIG. 1 with a resin cover removed, as seen from the rear side;

3 is an assembled perspective view of the generator of FIG. 1,

FIG. 4 is an enlarged sectional view of a main part of a conventional vehicle AC generator,

[Explanation of symbols]

4 ... Resin cover, 5a ... + Rectifying element, 5b ...-
Side rectifying element, 12 ... Rear frame (frame), 51
… + Side heat radiation fin, 53… Resin bush, (bush), 55… Bolt (fastening member), 56… Nut (fastening member)

Claims (2)

[Claims] 1. A full-wave rectifier fixed to the outer end face of a frame by connecting a negative rectifier and a positive rectifier, and a resin cover fixed to the frame and surrounding the full-rectifier. The-side rectifying element is a rectifier-equipped rotary electric machine in which the-side terminal is directly fixed to the outer end surface of the frame so that the-side terminal can be conducted to the frame, and supports the + side rectifying element and + of the full-wave rectifier. A + side cooling fin that constitutes a side terminal, a bush integrally formed with resin around the mounting hole of the + side cooling fin, a mounting hole of the resin cover, and a mounting hole of the + side cooling fin. The resin cover and the +
A metal fastening member for fixing the side cooling fins to the frame, the resin bush separating the frame and the + side cooling fins at a predetermined interval, and the resin cover and the + side cooling fin. While separating the fins at a predetermined interval,
A rotating electric machine with a built-in rectifier, wherein the inner peripheral surface of the mounting hole of the + side cooling fin is entirely covered. 2. The rotary electric machine with a built-in rectifier according to claim 1, wherein the resin bush comprises a sleeve made of metal that penetrates and is fixed to the attachment hole of the + side cooling fin by the integral formation.