JP2016082613A - Rectifier of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rectifier of a rotary electric machine in which a press-fitting structure (press-fitting means 300) of a rectifier cell 70 into a radiation fin (cooling plate) 72 is changed so that performance is improved, and miniaturization and cost reduction is attained while a press-fitting method is used as the fixing means of the rectifier cell 70.SOLUTION: Press-fitting means 300 that is interposed between a rectifier cell 70, 71 and mounting hole 200 of a radiation fin 72, 73 comprises: a metal insert member 310 which forms a press-fitting part P; and a release groove 320 which forms a non-press-fitting part Q. Therefore, area of the press-fitting part P can be adjusted by the non-press-fitting part Q, and press-fitting load applying to the rectifier cell 70 can be adjusted by use of deformation of the insert member 310. The insert member 310 can facilitate radiation of the rectifier cell 70. Miniaturization and cost reduction can be attained because only the insert member 310 is added.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine rectifier, and more particularly to a rotating electrical machine rectifier suitable for application to an AC generator (alternator) mounted on a vehicle such as a passenger car or a truck.

[Conventional technology]
In recent years, in the vehicle, various equipment around the engine has been increased from the viewpoint of high performance such as improvement of comfort and safety, and the engine room has been further narrowed from the viewpoint of securing a living space in the vehicle interior. There is a tendency.
For this reason, various devices mounted on the vehicle and in the engine room, particularly the AC generator, are in a very severe environment. In other words, the AC generator itself generates heat, so it needs to be cooled, but it is exposed to high ambient temperatures, and the generator itself is also downsized due to the mounting space. The increase in the power generation capacity of generators is required due to an increase in various electric loads for improving comfort and safety. Therefore, the AC generator has increased heat generation and tends to be large and costly.

  Therefore, in the AC generator, strict improvement studies have been repeated for all the components in order to suppress heat generation and reduce the size and cost. Above all, the focus is on improving rectifiers that have rectifying elements (hereinafter also referred to as diodes), which are heat-generating components, and that occupy a large space, and have high performance (for example, cooling performance) while being small and low cost. ) Is desired.

In response to such demands, various proposals have been made so far, and rectifiers with various structures have been put to practical use.
For example, as means for improving performance such as essential cooling performance, measures have been sought from the viewpoint of increasing the cooling efficiency of a cooling plate (hereinafter also referred to as a heat radiation fin) in which a plurality of diodes are juxtaposed. As a typical example, a rectifier as in Patent Document 1 is known. This rectifier is basically configured to improve the cooling performance by expanding the surface area (heat dissipating area) by changing the heat dissipating fin from a simple flat plate shape to a complicated shape with a plurality of sub fins protruding on the surface. It is what.

  Also, the means for mounting the diode to the heat radiating fin has been reviewed with a focus on performance and cost such as reliability and durability. The most significant change is that a so-called soldering method that has been widely used so far, that is, a fixing method in which a diode is soldered to a heat radiating fin is deceived. This soldering method requires plating for soldering in relation to the material of the radiating fin, which is troublesome and costly, and it is regarded as a problem that a problem that the diode is easily detached due to thermal fatigue of the solder, etc. As a fixing method that can solve such problems, a so-called press-fitting method has been developed in which a diode is press-fitted and fixed in a mounting hole provided in a heat radiating fin, and this press-fitting method is now used in most rectifiers (for example, patents). References 2 and 3).

[Problems of the prior art]
However, these measures still have the following problems, and further improvements are required.
For example, the measure to improve the former radiating fin requires complicated post-processing such as advanced die-casting technology or cutting to manufacture the radiating fin itself because the radiating fin itself has a complicated and large shape having sub fins. Eventually, the rectifying device is not miniaturized and the manufacturing cost is inevitably high.

  In addition, in the latter press-fitting method, there is a degree of freedom in the method of manufacturing the radiating fin, but when a diode is press-fitted into the radiating fin, the accuracy problem of press-fitting tightening, and the radiating fin processed by plastic processing such as press Since the hardness of the press-fitted portion (mounting hole portion) of the diode is increased, it is difficult to sufficiently reduce the stress of the semiconductor pellet even when the disk is formed of a material harder than the heat radiating fin as in Patent Document 2. There are cases.

  However, in the press-fitting method, as in Patent Document 3, the heat dissipating fins are made of die-cast, and uneven portions are provided in the circumferential direction so as to form a plurality of grooves along the press-fitting direction of the diodes on the inner peripheral surface of the mounting hole. Although a proposal has been made, it is still difficult to reduce the stress of the semiconductor pellet due to the press-fitting load, although the accuracy problem of press-fitting allowance is alleviated.

Therefore, in order to improve the structure of the diode itself to withstand the press-fitting load, the thickness of the disk is increased, or the center of the bottom of the disk is raised to separate the position where the heat-sink is pressed into the mounting position of the semiconductor pellet. However, all of these improvement measures increase the radial length or axial length of the disk and increase the size of the diode itself. For this reason, diodes such as a three-phase AC generator are often used for vehicles. There is a problem that the rectifier that uses as many as six cannot be adopted.

JP 2004-112860 A JP 2002-1119029 A JP 2013-39023 A

  As described above in detail, in this type of rectifier, further improvement in performance, size reduction, and cost reduction are the current problems of those skilled in the art.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to fix the rectifying element by changing the press-fitting structure of the rectifying element (diode) to the cooling plate (radiating fin). An object of the present invention is to provide a rectifier for a rotating electrical machine that can achieve further performance improvement and reduction in size and cost while maintaining a press-fitting method as a means.

[Means of Claim 1]
The invention (rectifying device) according to claim 1 is provided with a rectifying element having a metal cup-shaped disk and a semiconductor pellet sealed in the disk, and is provided penetrating in the plate thickness direction, and attaches the rectifying element. And a metal cooling plate having a plurality of mounting holes, and the rectifying elements are individually fitted into the mounting holes by press-fitting means, so that the plurality of rectifying elements are juxtaposed on one cooling plate. It has a basic configuration.

In particular, in the present invention, a device is required for the press-fitting means for fitting the rectifying element into the mounting hole.
The press-fitting means has a press-fitting region such as a press-fitting part P and a non-fitting part Q, and is a metal insert that is interposed between the rectifying element and the mounting hole as a component and forms the press-fitting part P. A member and a relief groove that forms the non-press-fit portion Q are provided.
The insert member forming the central part has a cylindrical shape, and the inner peripheral surface of the insert member is pressed against the outer peripheral surface of the disk, and the outer peripheral surface of the insert member is pressed against the inner peripheral surface of the mounting hole. The rectifying element is press-fitted and fixed in the mounting hole of the cooling plate.
Also, in the three members of the rectifying element, the mounting hole of the cooling plate, and the insert member, one side in the axial direction is referred to as one end side, and the opposite side is referred to as the other end side. When the peripheral surfaces facing each other are called opposing surfaces M,
Of the three members, at least one of the two members is provided with a relief groove that forms a non-press-fit portion P between the opposing surfaces M and M.

According to the above configuration, the press-fitting region of the press-fitting means is divided into the press-fitting part P and the non-fitting part Q, and the axial length of the insert member that forms the press-fitting part P and the relief groove that forms the non-fitting part Q Thus, the area occupied by the press-fitting portion P (substantially press-fitted area) can be adjusted, so that the press-fitting load applied to the rectifying element can be adjusted.
Further, it is possible to reduce the press-fit load applied to the rectifying element by utilizing the deformation (plastic deformation) of the insert member.
Furthermore, since the insert member surrounds the periphery of the rectifying element and can be positively exposed to cooling air, the insert member can be used as a heat dissipation promoting member.

  Therefore, according to the present invention, it is possible to improve the cooling performance of the rectifier element without increasing the size of the rectifier element, while maintaining the press-fitting method as the fixing means, so that the high performance, small size and low cost can be achieved. It is possible to provide a straightening device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows typically the whole structure of the alternating current generator for vehicles which is a typical example of the rotary electric machine incorporating the rectifier which applies this invention (Example). BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged vertical cross-sectional view of a main part and the same structural part (Example 1). It is an enlarged vertical sectional view for demonstrating the example about the assembly method of the main components in said embodiment (Example 1). It provides for description of two other concrete embodiment of this invention apparatus, (a), (b) is an expanded longitudinal cross-sectional view of the principal part (Example 2, 3). FIG. 2 is an enlarged vertical cross-sectional view of a main part (Examples 4 and 5) for explaining two other specific embodiments of the apparatus of the present invention. FIG. 10 is an enlarged vertical cross-sectional view of a main part showing two forms on the rectifying element side in order to explain another specific embodiment of the device of the present invention (Example 6). It provides for description of two other concrete embodiment of this invention apparatus, (a), (b) is an expanded longitudinal cross-sectional view of the principal part (Examples 7 and 8). It is a perspective view with which it uses for description of other embodiment of the main components (insert member) in this invention apparatus (Example 9).

  Hereinafter, the best mode for carrying out the present invention will be described in detail according to embodiments shown in the drawings.

The present embodiment represents a rectifier used in an automotive alternator (alternator) as a representative example of application of the present invention. In the following description, first, the overall configuration of an automotive alternator with a built-in rectifier is outlined, then the features of each embodiment of the rectifier to which the present invention is applied are sequentially described, and finally the features of the present invention. Summarize the effects of each point.
In the embodiments shown in the drawings, the same or equivalent parts are denoted by the same reference numerals, and redundant description is omitted.

[Overall configuration of AC generator]
First, an overall configuration of an automotive alternator equipped with a rectifier to which the present invention is applied will be outlined based on FIG.
An AC generator 1 shown in the present embodiment is a general-purpose Landel generator, which includes a stator S having an armature winding 2, a rotor R having a field winding 3, and a field winding. 3, a brush device 4 for supplying a field current to 3, a pair of frames 5, 6 that form an outline of the AC generator 1 together with a cover to be described later, a rectifier 7 that rectifies an AC voltage induced in the armature winding 2, And it is mainly comprised from the cover 8 etc. which cover this rectifier 7, brush apparatus 4, etc.

  The stator S is composed of an annular armature core 9 having slots (not shown) formed on the inner periphery thereof, and, for example, a three-phase armature winding 2 wound around the armature core 9. As the rotor R rotates, for example, a three-phase AC voltage is generated in the armature winding 2.

The rotor R has a pair of claw-type field cores 11 fixed to the rotary shaft 10 by press-fitting or the like, and a field winding 3 wound around the field core 11.
The rotary shaft 10 has a pulley 12 fixed to an end on one end side (the left side in the drawing), and is driven to rotate by an engine (not shown) through the pulley 12. A pair of slip rings 13a, 13b is attached to the end of the other end side (right side in the figure) of the rotating shaft 10, and both ends of the field winding 3 are electrically connected to the slip rings 13a, 13b.
A brush device 4 having a pair of brushes 4a and 4b is disposed on the outer periphery of the pair of slip rings 13a and 13b. The brush device 4 is supplied with power from a power source (vehicle battery) (not shown) outside the generator 1. In response to the rotation of the rotating shaft 10, the brushes 4a and 4b supply a field current to the field winding 3 while slidingly contacting the slip rings 13a and 13b.
Cooling fans 14 and 15 that rotate integrally with the rotor R and generate cooling air are fixed to both end surfaces in the axial direction of the field iron core 11 by welding or the like.

The pair of frames 5 and 6 includes a front frame 5 disposed on one axial end side of the stator S and the rotor R, and a rear frame 6 disposed on the other axial end side of the stator S and the rotor R. The armature core 9 is sandwiched from both sides in the axial direction by the both frames 5 and 6, and the rotating shaft 10 is rotatably supported through a pair of bearings 16 and 17.
The pair of frames 5 and 6 incorporates outside air (cooling air) inside the frames 5 and 6, and cools and heats the heat-generating components such as the armature winding 2. Windows 51 and 61 for discharging to the outside of 6 are appropriately provided.

The rectifier 7 is for full-wave rectification of the AC voltage, which is the output voltage of the armature winding 2, to obtain DC output power, and a plurality of (armature winding 2) forming a full-wave rectifier circuit. For example, in the case of three-phase, three pairs, a total of six) rectifier elements (diodes) 70, 71, a pair of heat radiation fins (cooling plates) 72, 73 to which these rectifier elements 70, 71 are attached, It comprises a wiring member 74 and the like for performing necessary connection between the rectifying elements 70 and 71.
The rectifying elements 70 and 71 to be paired are classified into a positive rectifying element 70 connected to a positive electrode of an in-vehicle battery (not shown) and a negative rectifying element 71 connected to the ground.
The pair of heat radiation fins 72 and 73 are formed of a metal plate, and the positive side heat radiation fin 72 to which the positive side rectifying element 70 is attached and fixed, and the negative side heat radiation fin to which the negative side rectifying element 71 is attached and fixed. 73.

The cover 8 is, for example, a resin-molded product having insulation and has a substantially bowl shape. The cover 8 covers each component (brush device 4, rectifying device 7, etc.) arranged outside the rear frame 6 and is not shown in the figure. It is fixed to the rear frame 6 together with the rectifier 7 by fixing means such as. Accordingly, the cover 8 also forms an outer shell of the AC generator 1.
The cover 8 is appropriately formed with ventilation openings 81 and 82 for introducing cooling air to the inside of the cover 8.

  Although the rectifier 7 is built in the AC generator 1 as described above, the mounting structure of the rectifier 7 described in the present embodiment is merely an example, and is not limited thereto. Needless to say. The details of the structure of the rectifier 7 according to the gist of the present invention will be described later.

By the way, in the AC generator 1 having the above-described structure, when the rotor R rotates when driven by the engine, an AC voltage is generated in the armature winding 2 of the stator S, and a DC output is output via the rectifier 7. It is taken out as electric power. And since the rectifier 7 affects the rectifying performance when the rectifying elements 70 and 71 that generate heat during the rectifying action become too hot, it is important to cool them together with the heat generating components such as the armature winding 2. For this reason, along with the rotation of the rotor R, cooling air is taken into the AC generator 1 from the outside by the cooling fans 14 and 15. Accordingly, cooling air is also introduced into the inside of the cover 8 mainly by the cooling fan 15 on the rear frame 6 side through the ventilation openings 81 and 82 of the cover 8. As the cooling air flows around the rectifier 7, the rectifier 7 is cooled.
Thus, since the rectifier 7 has a large occupied space in the AC generator 1 and is a heat-generating component, it is expected to exhibit small size and high performance.

[Example 1]
[Basic Configuration of Rectifier 7 and Features of Embodiment 1]
The basic configuration of the rectifying device 7 according to the present invention, the detailed structure of the rectifying elements 70 and 71 and the cooling fins 72 and 73 themselves that are the central functional parts, the attachment of the rectifying elements 70 and 71 and the cooling fins 72 and 73 One embodiment of the fixing structure will be described as Example 1 with reference to FIGS. 2 and 3.

Here, as described above, the rectifying device 7 radiates a plurality of (three by three) positive-side and negative-side rectifying elements 70 and 71 necessary for the full-wave rectifying action, and one positive-side and negative-side heat dissipation. The basic structure includes fins 72 and 73. When the rectifying elements 70 and 71 are attached to the radiation fins 72 and 73, substantially the same attachment structure is adopted on both the positive electrode side and the negative electrode side.
Therefore, in the following description of each embodiment and each modification, the positive side rectifying element 70 and the radiating fins 72 on the one side are represented by the negative side rectifying element 71 and the radiating fins 73 on the other side. The individual explanation will be omitted.
In FIG. 2, the two drawings (a) and (b) are duplicated for convenience of detailed explanation of the structure of the main part, and show the same structure to the last.

2A and 3, the rectifying element 70 and the heat radiating fin 72 have the following basic configuration.
The rectifying element 70 is a general one that is widely used, and includes a disk 100, a semiconductor pellet 110, and leads 120. The disk 100 is made of a metal such as copper and has a cup shape in which a concave portion 101 that opens to the upper end side is formed. A semiconductor pellet 110 is soldered to the inner bottom surface of the recess 101. Leads 120 are soldered to the top of the semiconductor pellet 110. The recess 101 of the disk 100 is loaded with a protective layer 130 made of silicon rubber or resin so as to cover the entire semiconductor pellet 110, and the semiconductor pellet 110 is sealed in the disk 100.

The radiating fins 72 are formed of a metal plate such as an aluminum plate, for example.
The radiating fin 72 is provided with a plurality (three) of attachment holes 200 penetrating in the thickness direction and corresponding to the number of rectifying elements 70 provided. Then, the plurality of rectifying elements 70 are juxtaposed on the single radiation fin 72 by individually fitting the plurality of rectifying elements 70 into the mounting holes 200 by the press-fitting means 300.
The so-called press-fitting method in which the rectifying element 70 is attached to the radiating fins 72 by press-fitting can reduce the man-hours and costs and improve the quality performance compared to the case of attaching by soldering. As an indispensable means.

The feature of the present invention is that the press-fitting means 300 is devised, and will be described in detail with reference to FIG.
The press-fitting means 300 has a press-fitting part P and a non-fitting part Q as a press-fitting region, and is interposed between the rectifying element 70 and the mounting hole 200 of the radiating fin 72 as a constituent element. A metal insert member 310 that forms P is provided, and an escape groove 320 that forms a non-press-fit portion Q is provided.

The insert member 310 has a cylindrical shape produced by cutting a metal pipe such as a copper pipe. The inner peripheral surface 311 of the insert member 310 is in pressure contact with the outer peripheral surface 102 of the disk 100 of the rectifying element 70, and the outer peripheral surface 312 of the insert member 310 is in press contact with the inner peripheral surface 201 of the mounting hole 200 of the radiating fin 72. Thus, the rectifying element 70 is press-fitted and fixed in the mounting hole 200 of the heat radiating fin 72.
In this embodiment, the outer peripheral surfaces 311 and 312 of the insert member 310 are in pressure contact with the outer peripheral surface 102 of the disk 100 and the inner peripheral surface 201 of the mounting hole 200 over the entire axial direction. The whole forms a press-fitting member and forms a press-fitting portion P.

And in the three members of the rectifying element 70, the mounting hole 200 of the radiating fin 72, and the insert member 310, one side in the axial direction is one end side (the upper end side in the figure), and the other side is the other end side (the lower end side in the figure). When the peripheral surface where two or three of these three members (70, 200, 310) face each other in the radial direction is called an opposing surface M,
Of the three members (70, 200, 310), at least one of the two members (two members) is provided with an annular relief groove 320 that forms a non-press-fit portion Q between the opposing surfaces M, M. .
In the present embodiment, in the two members of the rectifying element 70 and the mounting hole 200 of the radiating fin 72, the outer peripheral surface 102 of the disk 100 of the rectifying element 70, which is located on one end side (the upper end side in the figure), and the heat dissipation. An inner peripheral surface 201 (especially a conical surface 202 described later) of the mounting hole 200 of the fin 72 forms opposing surfaces M and M, and an escape groove 320 is provided between the opposing surfaces M and M.

  The escape groove 320 is recessed inward in the axial direction from the end surfaces 250 of the heat radiation fins 72 and 73 and is formed in the recessed portion. As a whole, the escape groove 320 has a circular truncated conical groove. And is constituted by a cylindrical portion 321 and a conical portion 322. The cylindrical portion 321 is formed by making the axial length of the insert member 310 shorter than the axial length of the disc 100 and the mounting hole 200. Further, the conical portion 322 is provided by forming a conical hole 202 whose diameter is enlarged on one end side (the upper end side in the drawing) of the inner peripheral surface 201 of the mounting hole 200.

  In contrast, the insert member 310 is disposed on the bottom side of the disk 100 of the rectifying element 70, and the axial length thereof is selected to be approximately the same as the bottom side plate thickness of the disk 100. Therefore, the insert member 310 forms a press-fit portion P only on the bottom side of the disk 100 with respect to the rectifying element 70. In other words, only the portion that is the solid portion of the disk 100 corresponds to the press-fit portion P, and conversely, the hollow portion (non-solid portion) of the disk 100 is between the radiating fins 72. There is a gap (relief groove 320) in the non-press-fit portion Q.

Here, an example of an assembling method of the rectifying element 70 and the radiation fin 72 in the rectifying device 7 having the above-described configuration will be introduced.
First, the dimensional tolerance relationship of the three members of the rectifying element 70, the mounting hole 200 of the radiating fin 72, and the insert member 310, for example, the inner diameter and outer diameter of the insert member 310 are the same as the outer diameter of the rectifying element 70 (disk 100). It is set in advance so as to be “tight fit” with respect to the inner diameter of the mounting hole 200 (inner peripheral surface 201) of the radiating fin 72. Then, as shown in FIG. 3, after the insert member 310 is fitted (press-fit) to the outer peripheral surface 102 of the rectifying element 70, the insert member 310 is inserted into the mounting hole 200 of the radiating fin 72 on the opposite side of the conical surface 202 (lower end in the figure). Fit from the side). Thus, the plurality of rectifying elements 70 can be individually attached to the single heat radiation fin 72 by the press-fitting means 300.

[Effect of Example 1]
According to the rectifier 7 having the above-described configuration, the following operational effects can be obtained.
(1) Since the press-fitting means 300 includes a metal insert member 310 interposed between the rectifying element 70 and the mounting hole 200 of the radiating fin 72, the press-fitting load of the rectifying element 70 is adjusted by the insert member 310. can do. That is, since the insert member 310 is small in volume, it is easy to be plastically deformed, and if the material is selected to be lower in hardness than the material of the disk 100 and the heat radiating fins 72, the insert member 310 can be further plastically deformed. The press-fitting load applied to the rectifying element 70 can be reduced.

(2) Moreover, since the press-fitting means 300 has the press-fit portion P and the non-press-fit portion Q as the press-fit region and includes the relief groove 320 that forms the non-press-fit portion Q, the press-fit portion P is formed by the non-press-fit portion Q. The axial length of can be increased or decreased. Therefore, it is possible to adjust the press-fit load applied to the rectifying element 70 by adjusting the axial length of the press-fit part P.

(3) Since the metal insert member 310 is interposed between the rectifying element 70 and the mounting hole 200 of the radiating fin 72, the press-fit load can be adjusted by utilizing the difference in thermal expansion between them. it can. That is, when the rectifying element 70 is directly press-fitted into the radiating fins 72, a large press-fitting load (a tight tightening allowance) in anticipation that the press-fitting strength is loosened due to a difference in thermal expansion between the two when the heat is high (during use) There is a possibility that the internal stress increases and damages the rectifying element 70 due to the necessity of setting, but the set press-fitting load of the rectifying element 70 itself can be reduced by the insert member 310.
That is, since the disk 100 and the insert member 310 of the rectifying element 70 are both made of copper and have the same thermal expansion coefficient (for example, linear expansion coefficient), even if thermal expansion occurs, the press-fit load (press-fit strength) between them does not substantially change. On the other hand, the radiating fins 72 are made of aluminum and have a higher thermal expansion coefficient than copper, and the press-fitting load with the insert member 310 is reduced (the press-fitting strength is loosened) due to the thermal expansion due to the expansion of the insert member 310 at the time of thermal expansion. Complementation can be made by increasing the contact area and the frictional force, and accordingly, the tightening allowance between the rectifying element 70 and the insert member 310 at normal temperature (when assembled) can be set on the loose side.
In the above description, the attachment strength between the rectifying element 70 and the heat radiation fin 72 is represented by the press-fit load (or press-fit strength) at the time of assembling the rectifying element (at room temperature). Since it is during operation of the generator 1, the mounting strength after assembly of the rectifying element until high heat is generally referred to as a load, axial force, fastening force, frictional force, fastening strength, etc. Of course, the mounting strength is a general term.
The material of the insert member 310 is lower in thermal expansion coefficient than aluminum (236 W / mK), for example, oxygen-free copper (391 W / mK), copper phosphate (339 W / mK), zircon copper (C15150). 373 W / mK), etc., it goes without saying that it can be appropriately selected according to the required function and cost.

(4) Further, according to the present embodiment, the press-fitting portion (press-fit portion P) between the rectifying element 70 and the heat radiating fin 72 is inserted into the bottom side of the rectifying element 70 by the insert member 310, that is, only the solid portion side of the disk 100. Is set. Therefore, in the case of the conventional configuration in which the entire rectifying element 70 including the hollow portion of the disk 100 is press-fitted into the heat radiating fins 72 (see Patent Documents 2 and 3), the hollow portion (part other than the solid portion) of the disk 100 by press-fitting. However, in the structure of this embodiment, only the solid portion of the disk 100 itself having high rigidity is used as the press-fit portion P. Therefore, the disk 100 is not deformed, and the stress applied to the semiconductor pellet 110 or the solder for joining the semiconductor pellet 110 and the disk 100 can be greatly reduced.

(5) Further, the heat dissipation of the rectifying element 70 can be promoted by the insert member 310 that forms the press-fit portion P and the escape groove 320 that forms the non-press-fit portion Q.
First, it is possible to improve the cooling performance of the rectifier 7 by effectively utilizing the escape groove 320 that forms the non-press-fit portion Q. One end side (the upper end side in the figure) of the insert member 310 is recessed in the axial direction from the end face 250 of the cooling plate 72, and a relief groove 320 is formed in the recessed portion. That is, the relief groove 320 forms an annular recess surrounding the outer periphery of the disk 100 of the rectifying element 70. The annular recesses generate turbulent flow in the cooling air flowing along the end surfaces 250 of the radiating fins 72, so that cooling of the outer periphery of the disk 100 is promoted and the cooling effect of the rectifying element 70 can be improved.
○ Secondly, since a metal insert member 310 is interposed between the rectifying element 70 and the radiating fin 72, a metal having good thermal conductivity such as copper is used as the material of the insert member 310. The heat dissipation area can be increased by the amount of the outer peripheral area of the insert member 310 larger than the outer peripheral area of the disk 100 of the rectifying element 70, and the heat of the rectifying element 70 can be quickly transmitted to the cooling fins 72 and dissipated. .

(6) Further, when a method of press-fitting from the opposite side of the conical surface 202 to the mounting hole 200 of the radiating fin 72 as shown in FIG. Can be removed. That is, when the insert member 310 is press-fitted, even if the “press-fit residue” is generated by scraping the inner peripheral surface 201 of the mounting hole 200 of the radiating fin 72 or the outer peripheral surface 311 of the insert member 310, the “press-fit residue” is conical. It is possible to discharge well along the conical surface 202 by utilizing the diameter expansion by the surface 202, and it is possible to prevent staying in the escape groove 320.

(Example 2)
Next, Example 2 which is another embodiment of the present invention will be described with reference to FIG.
The press-fitting means 300 of the present embodiment is obtained by changing the insert member 310 and the escape groove 320 to the reverse arrangement as compared with the first embodiment, and the other configurations are the same as those of the first embodiment.

  In the press-fitting means 300 of this embodiment, the insert member 310 is disposed on the hollow portion side of the disk 100 with respect to the rectifying element 70, and the escape groove 320 is disposed on the bottom side of the disk 100 with respect to the rectifying element 70. ing.

And according to the press-fitting means 300 of a present Example, the following effects are obtained by having the said structure.
(7) The press-fitting means 300 is substantially the same as the first embodiment because the structure of the insert member 310 and the escape groove 320 forming the press-fit portion P and the non-press-fit portion Q is the same as that of the first embodiment. Action effects, in particular, {the above effects (1), (2), (3), (5)} can be obtained.
(8) Further, the bottom side (hollow part side) of the disk 100 forms the press-fit part P. This bottom part side (hollow part side) is separated from the mounting position of the semiconductor pellet 110. Even when a press-fit load is applied, it is possible to reduce the stress applied to the semiconductor pellet 110 or the solder for joining the semiconductor pellet 110 and the disk 100.

(9) Further, since the non-bottom side (hollow part side) of the disk 100 forming the press-fit part P is a low rigidity side, it is advantageous in terms of design. In other words, the opposite bottom side (hollow part side) of the disk 100 is easily deformed into an upper constricted shape (inverted conical shape) with the upper end opened, and the press fit dimension between the insert member 310 and the disk 100 is, for example, an interference fit direction. Even if an error occurs, the error can be absorbed by the deformation. Therefore, the dimensional tolerance between the insert member 310 and the disk 100 can be relaxed, and the degree of design freedom is increased accordingly.

(10) Further, in the case of the present embodiment, the following operational effects can be obtained in connection with the adoption of the assembling method shown in FIG.
First, “press-fit residue” does not remain on the radiation fin 72 side.
The insert member 310 is press-fitted into the attachment hole 200 of the cooling plate 72 to the end of one end side (the upper end side in the figure) located on the opposite side to the press-fitting direction. That is, the upper end surface of the insert member 310 is in a position that is substantially the same as the upper end surface 250 of the radiating fin 72. For this reason, even if the assembly method shown in FIG. 3 is adopted and the insert member 310 is press-fitted into the mounting hole 200 from the conical surface 202 side, the “press-fit residue” can be satisfactorily removed. That is, the “press-fit residue” is pushed out to the upper end surface 250 of the radiating fin 72 by the insert member 310 and scraped off at the edge of the end surface 250. Therefore, “press-fit residue” does not remain on the heat radiation fin 72 side.
Secondly, since the press-fitting direction of the insert member 310 is on the conical surface 202 side with respect to the mounting hole 200, the assembling work can be simplified.
That is, the press-fitting direction of the insert member 310 is on the conical surface 202 side with respect to the mounting hole 200, so that the insert member 310 can be press-fitted into the mounting hole 200 while the conical surface 202 is used as a guide. Therefore, the press-fitting work of the insert member 310 can be performed simply and accurately.

(Example 3)
Next, Example 3 which is another embodiment of the present invention will be described with reference to FIG.
The press-fitting means 300 of the present embodiment is a combination of the above-described first and second embodiments. As shown in FIG. 4 (b), the structure of the first embodiment is employed on the upper side in the figure, and the lower part in the figure. It is characterized by having a so-called laminated press-fit structure employing the structure of Example 2 on the side.

4B, in the press-fitting means 300, the insert member 310 that forms the press-fitting portion P is disposed in the central portion in the axial direction with respect to the mounting hole 200 of the radiating fin 72, and the axial front and rear (upper end) A frustoconical relief groove 320 that forms a non-press-fit portion Q is disposed on the side and the lower end side.
The lower end side of the press-fitting position of the insert member 310 is positioned below the upper surface side of the bottom of the disk 100 of the rectifying element 70. Therefore, the insert member 310 is arranged across the bottom side and the non-bottom side (hollow part side) of the disk 100 with respect to the rectifying element 70 to form a press-fit portion P.

According to the press-fitting means 300 of the present embodiment, the following operational effects can be obtained.
(11) Since the press-fitting region is configured in the order of the non-press-fitted part Q, the press-fitted part P, and the non-fitted part Q in the axial direction, and the press-fitted part P is located at the central part, the rectifying element 70 can be stably radiated. 72 can be attached and fixed. Moreover, the press-fitting direction of the rectifying element 70 can be freely selected.
(12) The insert member 310 has both end portions in the axial direction recessed from the end surfaces 250 of the heat radiation fins 72 and 73 in the axial direction, and a relief groove that forms a non-press-fit portion Q in the recessed portions. Since 320 is provided, the heat release of the rectifying element 70 can be further promoted by the both escape grooves 320.

(Examples 4 and 5)
Next, Examples 4 and 5 which are other embodiments of the present invention will be described with reference to FIGS. 5 (a) and 5 (b).
Both of these embodiments show configuration examples for more actively utilizing the insert member 310 that is a main component of the press-fitting means 300 as a cooling member (heat radiating member).

* Example 4
In FIG. 5A showing the fourth embodiment, the press-fitting means 300 includes a cylindrical insert member 310 having an axial length longer than the plate thickness of the radiating fin 72 and the axial length of the disk 100 of the rectifying element 70, and the radiating fin. 72 is provided on one end side (the upper end side in the drawing) of the 72 mounting holes 200, and a frustum-shaped escape groove 320 that forms a non-press-fit portion Q is provided.

The insert member 310 forms projecting portions 313 in which both end portions in the axial direction project outward in the axial direction from both end surfaces 250 of the radiating fins 72. The inner peripheral surface 311 of the insert member 310 is in pressure contact with the disk 100 of the rectifying element 70 over the entire outer peripheral surface 102.
On the other hand, the escape groove 320 is provided by forming the inner peripheral surface 201 on the conical surface 202 on one end side (the upper end side in the drawing) of the mounting hole 200 of the radiating fin 72. That is, the mounting hole 200 itself of the radiating fin 72 has substantially the same structure as that of the first embodiment, but when compared with the groove shape of the escape groove 320 of the first embodiment, the cylindrical portion 321 is the insert member 310. It has a shape equivalent to a state where it is buried and only the conical portion 322 is left.

  Therefore, in the present embodiment, the escape groove 320 is provided on the axial end of the outer peripheral surface 312 of the insert member 310 in the axial direction (upper end in the drawing) and the inner peripheral surface 201 (conical surface 202) of the mounting hole 200 of the radiating fin 72. It is provided between opposing surfaces M, M formed by one end side (the upper end side in the figure) in the direction. The outer peripheral surface 312 of the insert member 310 is divided into a press-fit portion P that is press-contacted with the inner peripheral surface 201 of the mounting hole 200 of the radiating fin 72 and a non-press-fit portion Q that is not press-fitted by the escape groove 320. Yes.

  According to the press-fitting means 300 of the present embodiment, the insert member 310 is in a press-fit state with the rectifying element 70, but there is a non-press-fit portion Q between the radiating fins 72. The press-fitting load of the element 70 can be adjusted (relaxed).

  In particular, according to the present embodiment, since the protruding portions 313 at both ends in the axial direction protrude from the both end surfaces 250 of the radiating fins 72 outward in the axial direction, the protruding portions 313 are a kind of radiating fins. Play a role. That is, since the protruding portion 313 is exposed to the cooling air flowing along the end surface 250 of the radiating fin 72, the protruding portion 313 functions as a radiating fin, and the protruding portion 313 can substantially expand the heat radiating area. Thus, heat dissipation of the rectifying element 70 from the insert member 310 can be promoted, and the cooling performance of the rectifying device 7 can be improved.

In the fourth embodiment, the escape groove 320 is disposed on the opposite side, that is, the escape groove 320 is disposed on the other end side in the axial direction with respect to the mounting hole 200 of the heat radiation fin 72 (as in the second embodiment). It may be provided on the lower end side in the figure.
Moreover, you may make it provide the protrusion part 313 of the insert member 310 only in one side of the one end side or the other end side of an axial direction.

* Example 5
In FIG. 5B showing the fifth embodiment, the press-fitting means 300 includes a cylindrical insert member 310 having a flange-shaped portion 314 on one end side in the axial direction (the upper end side in the drawing), and heat dissipation as in the second embodiment. An escape groove 320 provided on the lower end side (the lower end side in the figure) in the axial direction with respect to the mounting hole 200 of the fin 72 is provided.

  Therefore, in this embodiment, the escape groove 320 is formed on the other end side (the lower end side in the drawing) of the outer peripheral surface 312 of the insert member 310 and the inner peripheral surface 201 (conical surface 202) of the mounting hole 200 of the radiating fin 72. It is provided between opposing surfaces M, M formed by the other end side (the lower end side in the drawing) in the axial direction. The outer peripheral surface 312 of the insert member 310 is divided into a press-fit portion P that is press-contacted with the inner peripheral surface 201 of the mounting hole 200 of the radiating fin 72 and a non-press-fit portion Q that is not press-fitted by the escape groove 320. Yes.

The insert member 310 has an axial length substantially the same as the axial length of the mounting hole 200 of the radiating fin 72, and the end face of the radiating fin 72 is only on one end side (the upper end side in the figure) in the axial direction. A large-diameter bowl-shaped portion 314 that protrudes outward in the axial direction from 250 and extends in the outer diameter direction is formed. In addition, the back surface of the bowl-shaped portion 314 is in contact with the end surface 250 of the radiating fin 72.
Further, the other end side (the lower end side in the drawing) of the insert member 310 reaches a position in contact with the end face 250 of the radiating fin 72 and does not protrude from the end face 250 of the radiating fin 72.

  According to the present embodiment having the above-described configuration, the insert member 310 is in a press-fit state with the rectifying element 70 as in the fourth embodiment, but the non-press-fit portion Q is present between the radiating fins 72. The press-fitting load of the rectifying element 70 can be adjusted (relaxed) by the non-press-fitted portion Q.

  According to the present embodiment, the insert member 310 has the hook-shaped portion 314 that protrudes outward in the axial direction from the end surface 250 of the radiating fin 72 and extends in the outer diameter direction. It abuts against the end face 250 of the radiating fin 72. For this reason, the hook-shaped portion 314 serves as a kind of heat radiation fin that comes into contact with the cooling air flowing along the end surface 250 of the heat radiation fin 72. Thus, since the heat radiation area is substantially enlarged by the hook-shaped portion 314, the heat radiation of the rectifying element 70 from the insert member 310 can be promoted, and the cooling performance of the rectifying device 7 can be improved.

In addition, the insert member 310 includes the hook-shaped portion 314, so that the radiating fin 72 itself is distorted and deformed at the time of manufacturing the radiating fin 72 (for example, the distortion between the inner peripheral surface of the mounting hole 200 and the central axis, the fin surface, etc. Can be corrected.
In other words, the insert member 310 is enhanced in rigidity by the hook-shaped portion 314 and has an excellent function of maintaining a cylindrical shape. Therefore, the distortion between the inner peripheral surface of the mounting hole 200 and the central axis can be corrected (corrected) during press-fitting. it can. In addition, since the flange-shaped portion 314 is brought into pressure contact with the end face 250 of the heat radiating fin 72, it contributes to smoothing of the end face 250 of the heat radiating fin 72. Therefore, warping and undulation of the fin surface can be corrected.

As an example of the assembly method of the present embodiment, an insert member 310 having a hook-shaped portion 314 in advance is used, and after fitting (press-fitting) into the rectifying element 70, the whole is illustrated. It can be easily assembled by press-fitting from the upper end side.
In addition, since the other end side (the lower end side in the drawing) of the insert member 310 reaches a position in contact with the end face 250 of the radiating fin 72, the press-fit residue can be discharged well.

  By the way, it is of course possible to reversely arrange the press-fitting means 300, that is, to arrange the press-fitting part P and the non-fitting part Q as in the fourth embodiment. However, if the escape groove 320 is positioned below the flange-shaped portion 314 of the insert member 310, there is a concern that the escape groove 320 may block the heat dissipation path. Since there is no escape groove 320 below the flange portion 314 of the insert member 310, such a concern can be completely eliminated.

(Example 6)
Next, Example 6 which is another embodiment of the present invention will be described with reference to FIG.
The sixth embodiment shows an example in which the configuration (how to construct) the escape groove 320 of the press-fitting means 300 is completely different from those of the first to fifth embodiments. That is, in the first to fifth embodiments, the conical surface 202 is formed in the mounting hole 200 of the radiating fin 72 in order to provide the escape groove 320. However, in this embodiment, the outer peripheral surface 102 of the disk 100 of the rectifying element 70 is formed. An escape groove 320 is provided by forming a conical surface 103 on the surface.

Here, FIG. 6 shows different embodiments on the left and right with the lead 120 of the rectifying element 70 as the center, that is, two forms in which the positional relationship between the press-fit portion P and the non-press-fit portion Q is turned upside down. .
6, in the case of the embodiment shown on the left side, a conical surface 103 is formed on the upper end side of the outer peripheral surface 102 of the disc 100, and in the case of the embodiment shown on the right side, the outer peripheral surface 102 of the disc 100 is formed. By forming the conical surface 103 on the lower end side, the escape grooves 320 are respectively formed.

Therefore, in this embodiment, the opposing surface M of the escape groove 320 that forms the non-press-fit portion Q is held by the inner peripheral surface 311 of the insert member 310 and the outer peripheral surface 102 (conical surface 103) of the disc 100.
The insert member 310 has an axial length substantially the same as the axial length of the mounting hole 200 of the radiating fin 72, and one end side (upper end side in the figure) and the other end side (lower end side in the figure) of the axial direction. ) Are both in contact with the end face 250 of the radiating fin 72 and do not protrude from the end face 250 of the radiating fin 72.

(Examples 7 and 8)
Next, Examples 7 and 8 which are other embodiments of the present invention will be described with reference to FIGS. 7 (a) and 7 (b).
The seventh and eighth embodiments show examples in which the configuration (how to construct) the relief groove 320 of the press-fitting means 300 and the groove shape are completely different from those of the first to sixth embodiments.

In FIG. 7, each of Examples 7 and 8 is configured such that an annular escape groove 320 is formed by using only the insert member 310, in particular, the outer peripheral surfaces 311 and 312 thereof. The press-fitting means 300 has, as a press-fitting region, a press-fit portion P on one end side (the upper end side in the drawing) of the insert member 310 in the axial direction and a non-press-fit portion Q on the other end side (the lower end side in the drawing). .
As in the sixth embodiment, the insert member 310 has an axial length substantially the same as the axial length of the mounting hole 200 of the radiating fin 72 and reaches a position in contact with the end face 250 of the radiating fin 72. The fin 72 does not protrude from both end faces 250.

The features of each embodiment are as follows.
In Example 7 shown in FIG. 7A, a large-diameter hole surface 315 that expands the inner diameter is provided on the inner peripheral surface 311 of the insert member 310, and the large-diameter hole surface 315 and the outer peripheral surface of the disk 100 of the rectifying element 70 An annular relief groove 320 is formed between the first and second grooves 102.
In Example 8 shown in FIG. 7B, the outer peripheral surface 312 of the insert member 310 is provided with a small-diameter shaft surface 316 that reduces the outer diameter, and the small-diameter shaft surface 316 and the inner peripheral surface of the mounting hole 200 of the radiation fin 72 An annular relief groove 320 is formed between the groove 201 and the groove 201.
Therefore, in the embodiment 7 shown in FIG. 7A, the opposing surface M of the escape groove 320 forming the non-press-fit portion Q is carried by the inner peripheral surface 311 of the insert member 310 and the outer peripheral surface 102 of the disk 100. In Example 8 shown in FIG. 7B, the outer peripheral surface 312 of the insert member 310 and the inner peripheral surface 201 of the mounting hole 200 of the radiating fin 72 are in charge.

  In the seventh and eighth embodiments, the press-fitting means 300 can reversely arrange the press-fitting part P and the non-fitting part Q. That is, by providing the large diameter hole surface 315 and the small diameter shaft surface 316 on the outer peripheral surfaces 311 and 312 on one end side (the upper end side in the drawing) of the insert member 310, one end side (the upper end in the drawing direction) of the insert member 310 in the axial direction is provided. The non-press-fit portion Q may be formed on the side), and the press-fit portion P may be formed on the other end side (the lower end side in the drawing).

Example 9
Next, Example 9 which is another embodiment of the main components of the present invention will be described with reference to FIG.
This Example 9 shows another embodiment of the insert member 310.
In each of the above-described embodiments, the cylindrical insert member 310 produced by, for example, cutting a metal pipe is used. However, in this embodiment, a flat metal plate K is used as a material, and this is a cylinder. The insert member 310 is produced by rounding into a shape.

According to the present embodiment, the insert member 310 has a C shape having a gap 317 on the mating surface, and the diameter of the insert member (310) can be changed by increasing or decreasing the circumferential length of the gap 317.
Therefore, the insert member 310 having an arbitrary diameter can be manufactured at a low cost. In addition, since the diameter can be enlarged or reduced by the size of the gap 317, the press-fitting load of the insert member 310 can be adjusted.

[Modification]
Although the present invention has been described in detail with respect to nine embodiments, various modifications can be made without departing from the spirit of the present invention, and modifications thereof will be exemplified.

(1) In Examples 1 to 3 shown in FIGS. 2 to 4, the entire shape of the escape groove 320 is formed in a circular truncated conical groove constituted by a cylindrical portion 321 and a conical portion 322. The conical portion 322 may be omitted and only the cylindrical portion 321 may be used.
(2) In Embodiments 4 to 6 shown in FIGS. 5 and 6, the conical surfaces 201 and 103 are provided on the radiating fin 72 or the disk 100 of the rectifying element 70 to form a truncated cone-shaped escape groove 320. Instead, by providing a large-diameter hole surface in the mounting hole 200 of the radiating fin 72 or by providing a small-diameter shaft surface on the outer peripheral surface 102 of the disk 100 of the rectifying element 70 as in Examples 7 and 8 shown in FIG. An annular relief groove 320 may be formed.
However, in the seventh and eighth embodiments, instead of the annular escape groove 320, a conical surface is provided on the outer peripheral surfaces 311 and 312 of the insert member 310, so that the truncated cone-shaped escape groove 320 is formed. May be.

(3) Moreover, in Example 1 shown in FIG. 2 and Example 2 shown in FIG. 4A, the lower end side (Example 1) or the upper end side (Example 2) of the insert member 310 is the end face of the radiation fin 72. The projecting portion 313 may be provided so as to project outward from 250, thereby improving the heat dissipation effect.

(4) In each of the above-described embodiments, different thermal expansion coefficients between the insert member 310 and the radiating fin 72 can be expected to have the following effect in addition to the effect (3) detailed in the first embodiment. . That is, due to the change in environment between normal temperature (when assembled) and high temperature (when used), due to the difference in thermal expansion between them, the press-fitting strength between the insert member 310 and the radiating fin 72 changes. By using the insert member 310 having a thermal expansion coefficient larger than that of the radiating fin 72, the fitting strength between the insert member 310 and the radiating fin 72 can be increased due to a difference in thermal expansion during use. Therefore, when the insert member 310 is press-fitted into the heat radiating fins 72, “stop fit” or “clearance fit” can be realized, and the assembling work becomes easy.

(5) Further, in each of the above embodiments, at least a part of the three members of the disk 100 of the rectifying element 70, the mounting hole 200 of the radiating fin 72, and the insert member 310 is plastically deformed with respect to the escape groove 200. By loading the caulking portion (not shown) formed in this manner, the retaining strength of the rectifying element 70 can be reinforced.

(6) In the above embodiment, the rectifying device 7 is disposed inside the cover 8, but may be disposed inside the frame 6.
(7) Moreover, although the above embodiment demonstrated the case where this invention was applied to the rectifier 7 of the alternating current generator (alternator) G for vehicles, it is not restricted to this, Various types incorporating a rectifier It can be applied to a rotating electric machine of the same type and the same effects can be achieved.

  The features and effects of the present invention that have been described in detail above will be summarized as follows according to each means described as a dependent claim in the scope of claims.

(Feature 1 = Means of claim 2)
In the rectifier 7 according to claim 1,
The insert member 310 is characterized in that a press-fit portion P is formed only on the bottom side of the disk 100 in the rectifying elements (diodes) 70 and 71 (see, for example, Embodiment 1).
According to the above means, since the solid part (bottom part) of the disk 100 has high rigidity, and only the region having this high rigidity is utilized as the press-fit part P, the disk 100 is not deformed, and the semiconductor pellet 110 or The stress applied to the solder for joining the semiconductor pellet 110 and the disk 100 can be greatly reduced.

(Feature point 2 = Means of claim 3)
Rectifier device (7) according to claim 1,
The insert member 310 is characterized in that the press-fitting portion P is formed only on the rectifying element 70, 71 on the opposite bottom side (hollow portion side) of the disk 100 (see, for example, Example 2).
According to the above means, the opposite bottom side (hollow part side) of the disk 100 forming the press-fit portion P is a low-rigid side, so that it is easily deformed, and the press-fitting dimension between the insert member 310 and the disk 100 is, for example, an interference fit direction. Even if an error occurs, the error can be absorbed by the deformation. Therefore, the dimensional tolerance between the insert member 310 and the disk 100 can be relaxed, and the degree of design freedom is increased accordingly.
Further, since the opposite bottom side (hollow part side) of the disk 100 is separated from the mounting position of the semiconductor pellet 110, even if a press-fitting load is applied, the semiconductor pellet 110 or the solder for joining the semiconductor pellet 110 and the disk 100 is given. It becomes possible to reduce stress.

(Feature point 3 = Means of claim 4)
In the rectifier 7 according to any one of claims 1 to 3,
At least one of the one end side or the other end side of the insert member 310 is positioned so as to be recessed inward in the axial direction from the end surfaces of the cooling plates (radiating fins) 72 and 73, and is not press-fitted into the recessed portion (recessed portion). An escape groove 320 for forming the portion Q is provided (see, for example, Examples 1 to 3).
According to the above configuration, since the turbulent flow is generated in the cooling air flowing along the end surface 250 of the radiating fin 72 by the concave portion, the cooling around the outer periphery of the disk 100 is promoted, and the cooling effect of the rectifying elements 70 and 71 is increased. Can be improved.

(Feature point 4 = Means of claim 5)
In the rectifier 7 according to claim 1,
The insert member 310 is characterized in that at least one of one end side or the other end side protrudes outward in the axial direction from the end surfaces 250 of the cooling plates 72 and 73 (see, for example, Example 4).
According to the above means, since the heat radiation area can be substantially enlarged by the protruding portion 313, the heat radiation of the rectifying element 70 from the insert member 310 can be promoted, and the cooling performance of the rectifying device 7 can be improved. .

(Feature point 5 = Means of claim 6)
In the rectifier 7 according to claim 1,
The insert member 310 has, on one end side, a hook-like portion 314 that protrudes outward in the axial direction from the end surfaces 250 of the cooling plates 72 and 73 and extends in the outer diameter direction. 73, which is in contact with the end face 250 (see, for example, Example 5).
According to the above means, since the heat radiation area can be substantially enlarged by the hook-shaped portion 314, heat radiation of the rectifying element 70 from the insert member 310 can be promoted, and the cooling performance of the rectifying device 7 can be improved. .
In addition, the insert member 310 includes the hook-shaped portion 314, so that the radiating fin 72 itself is distorted and deformed at the time of manufacturing the radiating fin 72 (for example, the distortion between the inner peripheral surface of the mounting hole 200 and the central axis, the fin surface, etc. Can be corrected.

(Feature point 6 = Means of claim 7)
In the rectifier 7 according to claim 1,
The escape groove 320 is provided on either the inner peripheral surface 311 or the outer peripheral surface 312 of the insert member 310 (see, for example, Examples 7 and 8).
According to the above means, both the press-fit portion P and the non-press-fit portion Q can be formed only with the insert member 310 as an additional part, and the configuration is simple.

(Feature Point 7 = Means of Claim 8)
In the rectifier 7 according to any one of claims 1 to 7,
The insert member 310 is formed of a material having a higher thermal conductivity or a lower thermal expansion coefficient than the cooling plates 72 and 73 {see, for example, the first embodiment and the modified example (3)}. .
According to the above means, when the thermal conductivity is made higher than that of the former cooling plates 72 and 73, the heat radiation to the cooling plates 72 and 73 can be promoted and the cooling performance can be improved. When the coefficient of thermal expansion is lower than that of the latter cooling plates 72 and 73, the cooling plates 72 and 73 and the insert member 310 are assembled (at room temperature) and used (at high temperature). By skillfully utilizing the difference in thermal expansion, the set press-fitting load (press-fitting load at the time of assembly) of the rectifying element 70 itself to the insert member 310 can be reduced.

(Feature point 8 = Means of claim 9)
In the rectifier 7 according to any one of claims 1 to 8,
One end of the insert member 310 located on the side opposite to the press-fitting direction of the insert member 310 with respect to the mounting hole 200 of the cooling plates 72 and 73 is terminated at one end side located on the side opposite to the press-fitting direction of the mounting hole 200. (See, for example, Examples 2 and 6 to 8).
According to the above means, the “pressed residue” is pushed out to the end surfaces 250 of the cooling plates 72 and 73 by the insert member 310 and scraped off at the edges of the end surfaces 250, so that it does not remain on the cooling plates 72 and 73 side. .

(Feature point 9 = Means of claim 10)
In the rectifier 7 according to any one of claims 1 to 9,
The insert member 310 is formed in a circular shape from a flat plate and has a C-shape having a gap 317 on its mating surface, and the diameter of the insert member 310 is variable by increasing or decreasing the gap 317. (See, eg, Example 9).
According to the above means, the insert member 310 having an arbitrary diameter can be manufactured at low cost. In addition, since the diameter can be enlarged or reduced by the size of the gap 317, the press-fitting load of the insert member 310 can be adjusted.

(Feature point 10 = Means of claim 11)
In the rectifier 7 according to any one of claims 1 to 10,
A caulking portion is formed by plastically deforming at least a part of the three members of the disk 100 of the rectifying elements 70 and 71, the mounting holes 200 of the radiating fins 72 and 73, and the insert member 310, and the caulking portion is released as a groove. 320 is characterized in that it is loaded {320, for example, see modification (4)}.
According to the above means, the retaining strength of the rectifying elements 70 and 71 can be reinforced by the caulking portion.

DESCRIPTION OF SYMBOLS 1 ... Alternator, 7 ... Rectifier, 70, 71 ... Rectifier element (diode) (one of three members), 72, 73 ... Cooling plate (radiation fin), 100 ... Cup-shaped disk, 102 ... Outer peripheral surface, DESCRIPTION OF SYMBOLS 110 ... Semiconductor pellet, 120 ... Lead, 200 ... Mounting hole (one of three members), 300 ... Press-fitting means, 310 ... Insert member (one of three members), 311 ... Outer peripheral surface, 312 ... Inner peripheral surface, 320 ... Escape groove, M ... opposite surface, P ... press-fit part, Q ... non-press-fit part.

Claims (11)

A rectifying element (70, 71) having a metal cup-shaped disk (100) and a semiconductor pellet (110) sealed in the disk (100), and the rectifying element provided penetrating in the plate thickness direction. A metal cooling plate (72, 73) having a plurality of mounting holes (200) for mounting (70, 71), and the rectifying elements (70, 71) with respect to the mounting holes (200). A rectifying device (7) having a configuration in which a plurality of the rectifying elements (70, 71) are juxtaposed on a single cooling plate (72, 73) by being individually fitted by press-fitting means (300). ,
The press-fitting means (300) has a press-fitting part (P) and a non-fitting part (Q) as a press-fitting region, and is interposed between the rectifying element (70, 71) and the mounting hole (200). A metal insert member (310) that forms the press-fit portion (P), and a relief groove (320) that forms the non-press-fit portion (Q),
The insert member (310) has a cylindrical shape, and an inner peripheral surface (311) of the insert member (310) is in pressure contact with an outer peripheral surface (102) of the disc (100), and the insert member (310 ) Is in pressure contact with the inner peripheral surface (201) of the mounting hole (200), so that the rectifying element (70, 71) is connected to the mounting hole (200) of the cooling plate (72, 73). )
In the three members of the rectifying element (70, 71), the mounting hole (200) of the cooling plate (72, 73), and the insert member (310), one side in the axial direction is one end side and the other side is the other side. When called the other end side, the peripheral surface where the two or three of the three members (70 or 71, 200, 310) face each other in the radial direction is called an opposing surface (M),
Of the three members (70 or 71, 200, 310), the relief groove (320) that forms the non-press-fit portion (Q) between the opposing surfaces (M, M) on at least one end side of the two members. A rectifier (7) characterized in that it is provided. Rectifier device (7) according to claim 1,
The insert member (310) forms the press-fitting portion (P) only on the bottom side of the disk (100) in the rectifier element (70, 71). Rectifier device (7) according to claim 1,
The insert member (310) forms the press-fitting part (P) only on the opposite bottom side (hollow part side) of the disk (100) in the rectifying element (70, 71). Device (7). In the rectifier (7) according to any one of claims 1 to 3,
The insert member (310) is positioned such that at least one of the one end side or the other end side is recessed inward in the axial direction from the end face (250) of the cooling plate (72, 73), and the recessed portion. The rectifier (7) is characterized in that the relief groove (320) for forming the non-press-fit portion (Q) is provided in the rectifier (7). Rectifier device (7) according to claim 1,
The insert member (310) is characterized in that at least one of the one end side and the other end side protrudes outward in the axial direction from the end face (250) of the cooling plate (72, 73). 7). Rectifier device (7) according to claim 1,
The insert member (310) has a hook-like portion (314) that protrudes outward in the axial direction from the end face (250) of the cooling plate (72, 73) and extends in the outer diameter direction on the one end side. The rectifier (7) is characterized in that the hook-shaped portion (314) is in contact with the end face (250) of the cooling plate (72, 73). Rectifier device (7) according to claim 1,
The rectifier (7), wherein the relief groove (320) is provided on either the inner peripheral surface (311) or the outer peripheral surface (312) of the insert member (310). In the rectifier (7) according to any one of claims 1 to 7,
The rectifier (7), wherein the insert member (310) is made of a material having a higher thermal conductivity or a lower thermal expansion coefficient than the cooling plates (72, 73). In the rectifier (7) according to any one of claims 1 to 8,
One end side of the insert member (310) positioned on the opposite side of the insertion direction of the insert member (310) with respect to the mounting hole (200) of the cooling plate (72, 73) is the mounting hole (200). ) Is press-fitted to the end on one end side located on the opposite side to the press-fitting direction. In the rectifier (7) according to any one of claims 1 to 9,
The insert member (310) is formed from a flat plate rounded into a cylindrical shape, and has a C-shape having a gap (317) on the mating surface. The insert member (310) is increased or decreased by increasing or decreasing the gap (317). 310) The diameter of the rectifier (7) is variable. In the rectifier (7) according to any one of claims 1 to 10,
The rectifying device (7), wherein the escape groove (320) is loaded with a caulking portion formed by plastic deformation of a part of the three members (70 or 71, 200, 310).