JP3458536B2 - Rectifier for automotive alternator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectifier attached to an automotive alternator.

[0002]

2. Description of the Related Art In an alternator for a vehicle, a rectifier composed of an assembly of a plurality of diodes is attached in order to reduce the size and weight of the entire generator. As shown in FIG. 10, this rectifying device includes a pair of arc-shaped radiating fins 11,
Diodes forming a rectifying circuit are held in contact with the back sides of the diode portions 15 and 16 of 12, respectively, and these heat radiation fins 11 and 12 are laminated at intervals by an intermediate insulator 17 as shown in FIG. , With the pipe rivet 14 which is a fastening member for both the laminated members,
The radiating fin 12 side is brought into contact with the frame 18 of the AC generator by the terminal block 13, and is fixed to the frame 18 by bolts 19 and nuts 20 penetrating the pipe rivet 14.

Further, in the rectifier, preventing the temperature rise of the diode leads to the extension of its life. Therefore, in order to secure the heat radiation of the diode and suppress the temperature rise of the diode under a limited size, Conventionally, each radiation fin 11, 12
In, the interval between the adjacent diode portions 15 and 16 is set to be large. As a result, the position of the diode portion 15 in the heat radiation fin 11 is such that, in the heat radiation fin 11 having an arc shape, the pipe rivet 1 for connecting the respective heat radiation fins 11 and 12 and fixing them to the frame 18 of the AC generator.
It is located on the outer diameter side of the line segments X and Y connecting the four.

Therefore, a rubber bush 21 for cushioning vibration is provided between the rectifying device and the frame 18, or the fin portion 12 of the heat radiation fin 11 is fixed near the diode portion 15 by a fixing screw 22 via a spacer 23. By using the structure in which the diode is fixed by screwing, the diode portion 15 is less susceptible to the vibration of the vehicle. In addition, each radiation fin 1
1 and 12 also function as conductors of each line in the rectifying circuit, and the pipe rivet 14 secures electrical continuity between the frame 18 and the radiation fin 11 to which the negative side diode of the rectifying circuit is joined.

[0005]

As described above, in the conventional rectifying device, the parts such as the rubber bush, the screw, the spacer, etc. are used in order to avoid the influence of the vibration from the vehicle. This caused an increase in points and an increase in assembly costs. Furthermore, in order to ensure reliable conduction between the radiation fin to which the negative diode is joined by the pipe rivet and the grounding circuit, it is necessary to manage the pipe rivet with a highly precise and narrowed shape, which reduces equipment and management costs. Was inviting an increase. An object of the present invention is to provide a rectifying device for an automotive alternator which is inexpensive and has a long life, which has a highly reliable ground circuit with excellent vibration resistance.

[0006]

Means for Solving the Problems] (claim 1) and a plurality of diodes forming a full-wave rectifier circuit exchanges generator, the cathode of the positive electrode side diodes of the full wave rectifier circuit contacts of the plurality of diodes The held positive side heat radiation fin, the negative side heat radiation fin to which the negative electrode side anode of the full-wave rectification circuit among the plurality of diodes is held in contact, and the negative side heat radiation fin are arranged along the negative side heat radiation fin. A rectifying device comprising an assembly including a plurality of laminated connecting members that laminate and connect the side heat radiating fins and the negative electrode side heat radiating fins in an insulating state, wherein the assembly is the position of the plurality of laminated connecting members. In a rectifier for a vehicle AC generator fixed to a frame of the AC generator, the negative electrode side
The above-mentioned laminated connecting member in which the junction portion on the anode side of the diode is adjacent
Is located on the centrifugal side of a line segment connecting the negative electrode side heat radiation fin and the frame on the centrifugal side of the line segment connecting the plurality of laminated connecting members. The technical means is to provide a fixing structure portion for directly fixing the frame and the frame.

(Claim 2) In addition to the structure of claim 1, the fixing structure is provided on the frame.
The projecting boss that protrudes to the position where it contacts the building part
Is provided, and the tip surface of the protruding boss is exposed on the negative electrode side.
Technology that it is directly fixed to the fixing structure of the heat fin
As a means. (Claim 3) In addition to the structure of claim 1 or 2, the center position of the negative electrode side diode, which is held in contact with the negative electrode side heat radiation fin, is closer to the centrifugal side than the line segment connecting the plurality of laminated connecting members. Positioning is the technical means. (Claim 4) In addition to the structure according to any one of claims 1 to 3, the positive electrode side heat radiation fins and the negative electrode side heat radiation fins are laminated in a rotational axis direction of the AC generator. And (Claim 5) In addition to the structure according to any one of claims 1 to 4 , the technical means is that a space is provided between the positive electrode side heat radiation fin and the negative electrode side heat radiation fin to stack them. (Claim 6) In addition to the structure according to any one of claims 1 to 5 , a technical means is that the fixing in the fixing structure portion is any one of bolts, knurls, rivets, and welding. (Claim 7) In addition to the structure according to any one of claims 1 to 6, it is a technical means that the heat radiation fin on the negative electrode side has a substantially arc shape.

[0008]

[ Operation ] When the anode side junction of the anode side diode is adjacent
It is located on the centrifugal side from the line connecting the layer connecting members, and
The heat dissipation on the negative electrode side is ensured by ensuring the conduction between the negative heat radiation fin and the frame on the centrifugal side of the line connecting the multiple laminated connecting members.
A fixing structure for directly fixing the fin and the frame is provided. Therefore, in the negative radiation fin having the negative diode held in contact therewith, the negative radiation fin is held and fixed at three points, that is, both ends of the line segment connecting the plurality of laminated connecting members and the centrifugal structure. It is possible to stabilize the diode which is disposed between the laminated connecting members on the negative-side heat radiation fin and which is joined and held. For this reason, even if the vibration of the vehicle is transmitted to the negative radiation fin, the vibration is less likely to expand at the negative radiation fin on the centrifugal side of the line segment connecting the plurality of laminated connecting members, and the vibration can be reduced. The durability is improved. Further, since the conduction between the negative-side heat radiation fins and the frame of the AC generator is ensured, it is not necessary to form another negative-side circuit (ground circuit) for securing conduction. Therefore, unlike the conventional case, it is not necessary to perform highly accurate shape management and component management of the laminated connecting member, unlike the case where the conduction between the negative-side heat radiation fins and the frame is secured by the laminated connecting member.

[0009]

[Advantages of the Invention] The anode side junction of the anode side diode is adjacent
It is located on the centrifugal side of the line segment that connects the matching laminated connecting members.
In addition, the negative radiation fin is electrically and mechanically directly fixed to the frame on the centrifugal side of the line connecting the laminated connecting members, so that the vibration resistance of the negative radiation fin is improved. Therefore, in order to improve the heat dissipation effect in the negative-side heat dissipation fin, the cooling performance of the negative-side heat dissipation fin is improved even if the interval between the diode junctions is appropriately widened, and the fixed structure heats the negative-side heat dissipation of the negative-side circuit. It is possible to secure conduction between the fin and the frame. Therefore, the equipment cost and management cost can be suppressed,
It can be an inexpensive rectifier.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on the embodiments shown in the drawings. FIG. 1 is a circuit diagram of a rectifying device 100 that is an embodiment of the present invention. The rectifying device 100 is connected to a stator coil 201 of a three-phase AC generator 200,
A bridge rectifier circuit 110 for full-wave rectifying the output of 01 is formed. The bridge rectifier circuit 110 is configured by connecting a negative side diode 111 and a positive side diode 112, each of which is composed of four diodes.
Ground wire (negative electrode wire) 113 and power output wire (positive electrode wire) 1
14 is connected to the regulator 300. Note that 202
Is a field coil of the AC generator 200.

FIG. 2 shows the outer appearance of the rectifying device 100. Figure 2
In the figure, 1 is the ground wire 113 of the bridge rectifier circuit 110.
2 is a positive-side heat radiation fin which is a part of the power supply output line 114 of the bridge rectifier circuit 110.

Each of the negative electrode side heat radiation fin 1 and the positive electrode side heat radiation fin 2 has a substantially arcuate shape, and the negative electrode side diode joint portion 5 or the positive electrode side diode joint portion 6 is formed along the arcuate shape. There is. Each of the diode junctions 5 and 6 is formed with a circular bulge from the back side in the figure toward the front side in FIG. 2, and the bridge rectifier circuit 110 is provided on the back side in the figure of the negative side diode junction section 5.
The anode (anode) of the negative electrode side diode 111 on the side of the ground wire 113 is joined, and the positive electrode side diode junction 6
On the back side of the drawing, the cathode (cathode) of the positive-side diode 112 on the power output line 114 side of the bridge rectifier circuit 110.
Are joined.

Reference numeral 4 denotes a pipe rivet which is a laminated co-fastening member for connecting the negative electrode side heat radiation fin 1 and the positive electrode side heat radiation fin 2, and has a fixing hole at the center. Pipe rivet 4
As shown in FIG. 3, the connection between the negative electrode side heat radiation fin 1 and the positive electrode side heat radiation fin 2 is performed by penetrating the cylindrical portion 3a of the terminal block 3 made of resin mold into the fixing hole formed in the positive electrode side heat radiation fin 2. After fitting the intermediate insulator 7 as a spacer between the negative electrode side heat radiation fin 1 and the positive electrode side heat radiation fin 2 on the outer side of the cylindrical portion 3a, the fixing hole formed in the cylindrical portion 3a and the negative electrode side heat radiation fin 1 After the pipe rivet 4 is penetrated inside, the ends of the pipe rivet 4 are plastically deformed by squeezing to connect the radiating fins 1 and 2.

Each radiating fin 1 by the pipe rivet 4
The laminated connection portion 2 has arcuate end portions 4a and 4c and an intermediate portion 4b along the arcuate shape of the heat radiation fins 1 and 2.
Are provided at three positions, but in the negative electrode side heat dissipation fin 1, between the adjacent laminated connection parts 4a-4b, 4c-4b.
With respect to the line segments X and Y respectively connecting the two, the negative electrode side diode junction portion 5 is located on the outer diameter side (centrifugal side) of the arc shape that is easily affected by external vibration. For this reason,
In the negative-side heat radiation fin 1, an extension portion 1a is formed on the outer diameter side from the position of the pipe rivet 4 in the intermediate portion 4b.
In a, a line segment L connecting each of the both end portions 4a, 4c,
The frame 21 of the alternator 200 is placed at a position such that each negative diode junction 5 is located on M (indicated by a broken line).
The fixing hole 1b for fixing to 0 is formed.

In FIG. 2, 230 is a brush for energizing the field coil by coming into contact with a sweep ring provided around the shaft of the rotor of the AC generator 200.

As shown in FIG. 3, the rectifying device 100 having the above-described structure utilizes the fixing holes of the pipe rivet 4 and the terminal block 3 so that the side of the positive radiating fin 2 faces the frame 210 of the AC generator 200. And is fixed to the frame 210 at the end of the rotating shaft of the generator 200 by the fixing bolt 220 and the fixing nut 221. In FIG. 3, 9 is a rear cover and 10 is a stator coil 201.
The stator terminal 10a connected to the end of the is a mounting screw.

Further, as shown in FIG. 4, the frame 210 is projected from the frame 210 to a position corresponding to the hole 1b of the extended portion 1a of the negative electrode side heat radiation fin 1 to a position where the negative electrode side heat radiation fin 1 is contacted. The protruding boss 211 is formed so that the tip end surface of the protruding boss 211 is fixed so as to be electrically connected to the extending portion 1 a of the negative-side heat radiation fin 1. As a result, the ground wire 113 of the rectifier 100 and the ground circuit of the AC generator 200 can be surely brought into conduction, and heat can be conducted from the negative radiation fin 1 to the frame 210 of the AC generator 200. Therefore, the heat dissipation of the negative-side heat dissipation fin 1 is promoted, and the cooling effect is increased.

In the first embodiment of FIG. 4, a female screw is formed at the center of the protruding boss 211, and the negative radiation fin 1 is mounted on the protruding boss 211 by a bolt 212 penetrating the hole 1b of the extending portion 1a. It is fixed by tightening to.

FIG. 5 shows the radiation fin 1 on the negative electrode side and the protruding boss 21.
2 shows a second embodiment relating to the fixing with 1. In the second embodiment, a through hole is formed in the protruding boss 211, the rivet 213 is passed through the hole 1b of the extending portion 1a and the through hole of the protruding boss 211, and the rivet 213 is formed on the protruding boss 211 side. Tighten and fix the tip of. Also in this case, since the negative-electrode side heat radiation fin 1 and the protruding boss 211 are brought into direct contact with each other, it is possible to surely conduct electricity and to secure the cooling effect.

FIG. 6 shows the radiation fin 1 on the negative electrode side and the protruding boss 21.
3 shows a third embodiment relating to the fixing with 1. In the third embodiment, a knurled eye 214 is formed at the tip of the protruding boss 211, and the knurled eye 214 portion of the protruding boss 211 is press-fitted and fixed in the hole 1b of the extending portion 1a of the negative electrode side heat radiation fin 1. Also in this case, the negative radiation fin 1 and the protruding boss 211
Since they are in direct contact with each other, they can be surely conducted and a cooling effect can be secured.

FIG. 7 shows the radiation fin 1 on the negative electrode side and the protruding boss 21.
4 shows a fourth embodiment relating to the fixing with 1. In the fourth embodiment, no holes are formed in the extending portion 1a and the protruding boss 211, and the distal end surface of the protruding boss 211 and the extending portion 1a are welded portions 215. Also in this case, since the negative-electrode side heat radiation fin 1 and the protruding boss 211 are brought into direct contact with each other, it is possible to surely conduct electricity and to secure the cooling effect.

As a fifth embodiment, as shown in FIGS. 8 and 9, the heat radiation fins other than the laminated fixing portion may not be laminated in the rotational axis direction.

As described above, in the present invention, the negative-side heat radiation fins 1 on the outer diameter side of the line segments X and Y connecting the pipe rivets 4 connecting the radiation fins to each other and the frame 210 of the AC generator 200 are extended. Since the portion 1a and the projecting boss 211 are provided and fixed directly to each other, the vibration resistance of the negative radiation fin 1 is improved. Therefore, in the negative radiation fin 1, the vibration resistance of the negative radiation fin 1 can be secured even if the space between the negative diode portions 5 to which the negative diodes 5 are joined is appropriately widened in order to enhance the heat radiation effect. . Moreover, since the negative electrode side heat radiation fin 1 is directly connected to the frame 210, the cooling property of the negative electrode side heat radiation fin 1 is improved, and the conduction between the negative electrode side heat radiation fin 1 and the frame 210 can be secured. Therefore, the facility cost and the management cost can be suppressed, and the rectifying device 100 can be made inexpensive.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a bridge rectification circuit of a rectification device showing an embodiment of the present invention.

FIG. 2 is a plan view showing an appearance of a rectifying device showing an embodiment of the present invention.

3 is a cross-sectional view taken along the line OA in FIG.

FIG. 4 is a sectional view taken along line OB in FIG. 2 of the first embodiment.

FIG. 5 is a sectional view taken along line OB in FIG. 2 of the second embodiment.

FIG. 6 is a sectional view taken along line OB in FIG. 2 of the third embodiment.

FIG. 7 is a sectional view taken along line OB in FIG. 2 of the fourth embodiment.

FIG. 8 is a plan view showing the outer appearance of a rectifying device according to a fifth embodiment of the present invention.

9 is a cross-sectional view taken along the line DD in FIG.

FIG. 10 is a plan view showing an appearance of a conventional rectifying device.

11 is a sectional view taken along the line OC in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Negative electrode side heat radiation fin 1a Extension part (fixed structure part) 2 Positive electrode side heat radiation fin 4 Pipe rivet (a plurality of laminated connecting members) 5 Negative electrode side diode joint 100 Rectifier (rectifier of vehicle alternator, assembly) ) 110 bridge rectification circuit (full-wave rectification circuit) 111 negative side diode (plurality of diodes) 112 positive side diode (plurality of diodes) 200 AC generator 210 frame 211 protruding boss (fixed structure part) X, Y line segment (plurality) Line segment connecting the laminated connecting members of

Claims (7)

(57) [Claims] 1. A plurality of diodes forming a full-wave rectifier circuit of an AC generator; a positive-side radiating fin in which a cathode of a positive-side diode of the full-wave rectifier circuit among the plurality of diodes is in contact with and held; A negative-side heat radiation fin to which the positive electrode of the negative-side diode of the full-wave rectifier circuit is held in contact with a plurality of diodes, a positive-side heat radiation fin and a negative-side heat radiation fin that are arranged along the negative-side heat radiation fin. A rectifying device comprising an assembly including a plurality of laminated connecting members that are laminated and connected in an insulated state, wherein the assembly is fixed to a frame of the alternator at a position of the plurality of laminated connecting members. In the rectifier of the AC generator for a vehicle, the anode side junction of the negative side diode is adjacent to the product.
It is located on the centrifugal side from the line connecting the layer connecting members, and
On the centrifugal side of the line segment connecting the plurality of laminated connecting members,
A rectifying device for a vehicle AC generator, comprising: a fixing structure portion that secures conduction between the negative-side heat radiation fins and the frame and directly fixes the negative-side heat radiation fins and the frame. 2. The frame is connected to the fixed structure portion.
A protruding boss is formed that protrudes to the touch position.
The tip surface of the protruding boss is the heat radiation fin on the negative electrode side.
Contractor characterized by being directly fixed to the fixed structure part of
A rectifier for a vehicle AC generator according to claim 1. 3. A center position of said negative electrode side diodes contact held on the negative electrode side radiating fin according to claim 1 or claim, characterized in that located on the distal side of the line segment connecting the plurality of laminated connecting member Item 2. A rectifying device for a vehicle AC generator according to Item 2 . 4. A vehicle according to what Re one of claims 1 to 3, characterized in that said the positive electrode side radiating fin and the negative electrode side radiating fin are stacked in the rotation axis direction of the AC generator AC generator rectifier. Wherein said positive electrode side radiating fin and the negative electrode side radiating fin and automotive alternator according to what Re one of claims 1 to 4, characterized in that laminated by providing a gap between the Rectifier. Wherein fixed in the fixing structure section, bolts, knurled, rivets, the vehicle alternator according to what Re one of claims 1 to 5, characterized in that either the welding Rectifier. Wherein said negative electrode side radiating fin, automotive alternator rectifier according to what Re one of claims 1 to 6, characterized in that a substantially arc shape.