JPH09237859A - Heat sink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen a heat sink in manufacturing cost dispensing with a brazing operation and to eliminate problems attendant on a brazing operation by a method wherein a material and its counterpart are pressed against each other by a press or the like to mechanically join heat sink components together forcibly fitting protrusions into corresponding recesses. SOLUTION: Heat sink components 2 which are laminated to form a heat sink are each composed of a fin 5 and a board component 6. Fitting recesses 7 are provided to the right side of the board component 6, and fitting protrusions 8 are provided to the left side of the board component 6. A protrudent stripe 13 protruding longitudinally is provided to each of the upper and lower side of the fitting recess 7, and a recessed stripe 14 which is engaged with the protrudent stripe 13 so as to prevent the fitting protrusion 8 from being disengaged from the fitting recess 7 is provided to the upper and lower side of the fitting protrusion 8 respectively. The fitting protrusion 8 is forcibly fitted into the fitting recess 7, whereby the heat sink components 2 are jointed together to form a heat sink 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink (radiator) used for cooling transistors and the like, and more particularly to a laminated heat sink of a shape member manufactured by laminating and extruding aluminum extruded shape members. Regarding

[0002] In this specification, "aluminum" includes aluminum alloy.

[0003]

2. Description of the Related Art A fin assembly and a substrate for mounting a heating element connected to the lower end of a fin assembly are formed by laminating and joining a heat sink structure made of an extruded aluminum material, which is composed of a fin portion and a substrate forming portion connected to the lower end thereof. Although the heat sink in which the heat sink is formed is conventionally known, the conventional heat sink of this type has been manufactured by brazing the substrate constituent parts of the adjacent heat sink constituents (actual fairness 5- 47473 and JP-A-6-216551).

[0004]

The above conventional heat sink has a problem that the manufacturing cost is high due to the joining by brazing, and the brazing material inserted into the notch flows downward during brazing. , The problem that unevenness occurs on the bottom surface of the substrate to which the heating element is attached and it is necessary to cut and flatten after brazing, and when the heating element is attached to the bottom surface of the substrate, the heating element becomes a brazing material. There is also a problem that the thermal conductivity decreases due to direct contact.

An object of the present invention is to provide a heat sink which reduces manufacturing costs and solves various problems caused by brazing.

[0006]

In the heat sink according to the present invention, a fin assembly is formed by laminating left and right heat sink constituents made of aluminum extruded profile, which are composed of a fin portion and a substrate constituting portion connected to the lower end of the fin portion, and joining them together. In a heat sink in which a body and a heating element mounting substrate connected to the lower end of the body are formed, a joining fitting concave portion is provided on either one of the facing surfaces of the adjacent substrate constituent parts.
On the other side, at least one joining fitting convex portion that is forcibly fitted into this is provided, and on the upper and lower side surfaces of either one of the fitting concave portion and the fitting convex portion,
At least one ridge extending in the front-rear direction is provided on each of the upper and lower surfaces on the other side of the ridge to prevent the fitting protrusion from coming out of the fitting recess. It is a feature.

One of the facing surfaces of the fin portion is provided with a joining fitting concave portion, and the other is provided with at least one joining fitting convex portion that is forcibly fitted therein. The convex ridges extending in the front and back are formed on the upper and lower side surfaces of one of the fitting concave portion and the fitting convex portion, and are engaged with the upper and lower side surfaces of the other side to fit the fitting convex portion. It is preferable that at least one recessed line is provided to prevent escape from the fitting recess. That is, it is preferable that, for example, the upper end portion of the fin portion has a configuration similar to that of the substrate forming portion.

The fitting convex portion and the fitting concave portion are dimensioned such that the fitting convex portion can be forcibly fitted into the fitting concave portion by a press or the like, and the fitting convex portion is fitted by using a press or the like. By forcibly fitting in the concave portion, the convex stripes and the concave stripes are fitted to each other to prevent the slip-out. At least one convex line and one concave line may be provided, but it is preferable that a plurality of them be provided in a sawtooth shape.

The direction in which the fitting convex portion is forcibly fitted into the fitting concave portion by a press or the like is the left-right direction. To force the fitting convex portion into the fitting concave portion, The front-back direction, that is, one heat sink structure may be slid with respect to the other heat sink structure.

It is preferable that the depth of the fitting recess for joining is larger than the height of the fitting protrusion for joining, and the difference is 0.3 mm or less.

Further, it is preferable that the upper and lower widths of the joining fitting concave portion are larger than the upper and lower widths of the joining fitting convex portion, and the difference between them is 0.2 mm or less.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In this specification, upper, lower, left, and right mean the upper, lower, left, and right of each figure, and
The front side of the page is the front and the back side is the rear.

FIG. 1 shows a heat sink (1) according to the present invention.
In the first embodiment, the heat sink (1) is formed by stacking the heat sink constituents (2) made of extruded aluminum profiles in layers.

As shown in FIG. 2, the heat sink structure (2) has a fin portion (5) composed of two plate-like fins (5a) provided at a predetermined interval and a fin portion (5). It is composed of a board constituting part (6) for connecting the lower ends of the plate-shaped fins (5a).

The fin portion (5) has two plate-like fins (5a).
An upper reinforcing portion (9) connecting the upper ends of the two and two intermediate reinforcing portions (10) connecting the intermediate portions of the two plate fins (5a) are provided. On the right side surface of the upper reinforcing part (9), there is provided a positioning mating recess (11) having a rectangular cross section extending in the front-rear direction.
On the left side of the upper reinforcement (9), this positioning mating recess
Positioning mating protrusion with square cross section that fits into (11) (12)
Is provided.

On the right side surface of the board constituting portion (6), there are provided two fitting recesses for joining (7) having a rectangular cross-section in the front and rear direction, which are vertically arranged at predetermined intervals, and the left side of the board constituting portion (6). The surface is provided with two fitting protrusions (8) having a rectangular cross section for being fitted into the fitting recesses (7).

As shown in the enlarged view of FIG. 5, the upper surface of the fitting recess for joining (7) is provided with three ridges (13) in a serrated shape extending in the front and rear of the obverse-angled isosceles triangle in cross section. Also, on the lower surface of the same, there is a ridge (1
3) is provided in the shape of three saw teeth. In addition, on both upper and lower surfaces of the fitting protrusion for joining (8), a concave strip with the same cross section as the convex strip (13) is provided.
Three (14) are provided in a sawtooth shape.

The upper and lower widths T of the fitting protrusion for joining (8) are
It is slightly smaller than the upper and lower width W of the fitting recess for joining (7) not including (13), and the upper and lower ridges of the fitting recess for joining (7).
It is made larger than the distance between (13). Therefore,
The fitting protrusion (8) cannot be manually fitted into the fitting recess (7), but if a press etc. is used, the fitting protrusion (8) will not fit into the fitting recess (7).
It can be forced into (7). This allows the ridges (13) of the mating recess (7) and the ridges (14) of the mating ridge (8).
It fits snugly in the box and prevents it from coming off. Further, the depth D of the fitting recess for joining (7) is
It is slightly larger than the height H of (8). This prevents a gap from being formed between the upper and lower ends of the adjacent board constituting portions (6) when the fitting concave portion (7) and the fitting convex portion (8) are fitted together.

Regarding the positioning fitting concave portion (11) and the positioning fitting convex portion (12) provided in the upper reinforcing portion (9) of the fin portion (5), the positioning fitting concave portion (11) is The positioning fitting convex portion (12) is loosely fitted.

The board constituting portion (6), the upper reinforcing portion (9) and the respective intermediate reinforcing portions (10) are slightly projected to the left and right of the two plate-like fins (5a), and the heat sink constituting body (6) When 2) are stacked in layers, these board components (6)
The upper reinforcing portion (9) and the intermediate reinforcing portions (10) are abutted against each other, so that a predetermined gap is formed between the adjacent plate-shaped fins (5a).

Upper reinforcement section (9) and each intermediate reinforcement section (10)
Suppresses the deformation of the plate fins (5a) and
It has a function of holding a) so that they are parallel to each other, so that the height of the plate fin (5a) can be increased.

Specific examples of the dimensions of the fitting recess for joining (7) and the fitting protrusion for joining (8) are as follows.
(7) has a top and bottom width W of 3.7 mm that does not include the ridges (13),
Depth D is 4.1 mm, and the ridge (13) has a width of 0.9 m.
The height is 0.3 mm and the height is 0.3 mm. The distance between the upper ridge (13) and the lower ridge (13) is 3.1 mm. The fitting protrusion (8) for joining has an upper and lower width T of 3.5 mm and a height H of 3.8 m.
and the groove (14) has a width of 0.9 mm and a depth of 0.3 m.
m, and the distance between the upper surface recessed ridge (14) and the lower surface recessed ridge (14) is 2.9 mm. Also, the positioning mating recess (11)
Has an opening width of 1.7 mm, and the positioning fitting convex portion (12) has a width of 1.5 mm.

Joining concave portion (7) and joining convex portion
As a result of various tests, the dimension of (8) is preferably set to the following value. That is, 0 <depth of fitting recess (7) D-height of fitting projection (8) H ≤ 0.3 mm (1) 0 <vertical width W of fitting recess (7) -fitting projection The vertical width T ≦ 0.2 mm of the part (8) (2) The condition (1) is that when the fitting concave part (7) and the fitting convex part (8) are fitted together, the adjacent board constituent parts (6) Prevents the formation of gaps between the upper and lower ends of the
This is a condition for preventing a large gap from being generated between the bottom surface of (7) and the top surface of the fitting convex portion (8) and collecting the cutting oil there.

The condition (2) is that the fitting concave portion (7) and the fitting convex portion are
(8) It is easy to fit the board component (6) to prevent the vertical height of the board component (6) from widening and the plate fins (5a) from being deformed, and at the same time This is a condition for preventing the heat conduction performance from decreasing.

The heat sink (1) is manufactured as follows.

First, the heat sink structure is made of A6063 material.
Extruded profiles are manufactured according to the shape of (2). By cutting this extruded shape into the required length, the required number of heat sink components (2) having the required length can be obtained. These heat sink structures (2) are stacked in layers and the positioning mating recess (11) and the positioning mating protrusion (12) are fitted between the upper reinforcing parts (9) of the fins (5). At the same time, the joining fitting convex portions (8) are fitted to the joining fitting concave portions (7) between the board components (6). Dimensionally, the joining mating protrusion (8) is not completely inserted into the joining mating recess (7), so pressing it with a press forces the joining mating protrusion (8). Fit into the mating recess (7). As a result, in addition to the frictional force between the upper and lower side surfaces of the fitting mating concave portion (7) and the mating fitting convex portion (8), the convex strip (13) and the concave strip (14) are engaged. By combining, the removal prevention is achieved. Thus,
A fin assembly (3) in which a plurality of plate-shaped fins (5a) are arranged side by side, and a lower end surface that is continuous with the lower end of the fin assembly (3)
A heat sink (1) comprising a substrate (4) on which a heating element is attached to (4a) is obtained.

In the above, the direction of pressing by the press is the left-right direction, but this is the front-back direction, that is, the length direction of the heat sink structure (2), and one heat sink structure (2) is the other heat sink structure. Slide the fitting mating protrusion (8) onto the fitting (2) to fit the fitting mating recess.
You may force it to fit in (7).

The height of the heat sink structure (2) is 100
~ 180 mm, width is about 10 mm, depth is 1
It is set to about 00 to 300 mm. Then, for example, 50 heat sink structures (2) are used to form a heat sink (1) having a width of 500 mm. When the pressing direction is the left-right direction, 50 steps are pressed at once. To manufacture a heat sink with a width of 500 mm,
Although it is possible to integrally extrude the whole, if the width of extrusion becomes wide, the cost of the extrusion die becomes very high. In contrast, each heat sink structure
Since the width of (2) is narrow, the cost of the extrusion die can be reduced, and the manufacturing cost of the heat sink (1) can be reduced.

At the time of manufacturing the above heat sink (1),
Since the joining is done mechanically, various problems due to brazing, for example, melted brazing material flows downward, and unevenness is formed on the lower end surface (6a) of the substrate component (6) of each heat sink component (2). Does not occur, and the heat generating element does not directly contact the brazing material to lower the thermal conductivity.

Although not shown, the height is 200 mm.
When manufacturing a large heat sink that exceeds the heat sink, use a heat sink structure (2) whose height is 1/2 of the heat sink height (2) as shown in Fig. 1.
Two pieces of the heat sink (1) may be stacked upside down on top of each other, and the upper reinforcing portions (9) of the two heat sinks (1) may be joined by argon welding. By doing this, the fin (5a) height of the heat sink structure (2)
It is not necessary to manufacture a die for extrusion, and a large heat sink can be manufactured at low cost.

The heat sink (1) is usually formed by a heat sink structure (2) having the same size so as to have a rectangular shape when viewed from a plane, but the cutting length when cutting the extruded profile is changed to be different. It is possible to easily obtain various shapes such as U-shape, T-shape, L-shape, etc. when viewed from a plane by manufacturing the heat sink structure (2) having the depth dimension and combining these variously. It is possible to cope with a heating element having the shape of. In particular, for large AC-DC inverters with over 100-1000 amperes,
There is a tendency for multiple heating elements to be used, and even in such a case, it is easy to make a substrate area suitable for the size and wattage of the heating element, and a heat-sink shape that is economically efficient can be obtained with the same extruded shape. The material can be used and chosen arbitrarily.

FIG. 3 shows a second embodiment of the heat sink structure (22).

The heat sink structure (22) shown in the figure is a substrate structure part that connects the fin portion (25) consisting of three plate-like fins (25a) and the lower ends of the three plate-like fins (25a). It consists of (26).

The fin portion (25) has three plate-like fins (25
The upper reinforcing part (29) connecting the upper end of (a) and the two intermediate reinforcing parts (30) connecting the intermediate parts of the three plate fins (25a).
Are provided.

The structures of the upper reinforcing part (29) and the substrate forming part (26) are the same as in the first embodiment. That is,
The right side surface of the upper reinforcing portion (29) is provided with a positioning mating concave portion (31) having a rectangular cross section extending in the front-rear direction, and the left side surface of the upper reinforcing portion (29) is provided with the mating concave portion (31). A positioning fitting convex portion (32) that is loosely fitted is provided. Then, on the right side surface of the board constituting portion (26), two fitting recesses for joining (27) having a rectangular cross section extending in the front and rear direction are provided vertically with a predetermined interval, and the left side surface of the board constituting portion (26) is provided. The two fitting protrusions (2) having a rectangular cross section and fitted in the fitting recesses (27).
8) is provided. Further, three protrusions (33) extending in the front and back of the obtuse isosceles triangle in cross section are provided on each of the upper and lower sides of the fitting recess for joining (3) in a saw-tooth shape. On each of the upper and lower side surfaces of the portion (28), three recessed ridges (34) having the same cross section as the ridged ridges (33) are provided in a sawtooth shape. The upper and lower widths of the fitting protrusion for joining (28) are slightly smaller than the upper and lower widths of the fitting recess for joining (27) not including the protrusions (33), and the fitting recess for joining (27) It is larger than the distance between the upper and lower ridges (33). Therefore, fit the fitting protrusion (28)
Although it cannot be fitted into (27) by hand, the fitting protrusion (28) can be forcibly fitted into the fitting recess (27) by using a press or the like. ) Convex stripes (33)
The recessed ridge (34) of the fitting convex portion (28) is tightly fitted to each other, so that the retainer is prevented.

FIG. 4 shows a third embodiment of the heat sink structure (42).

The heat sink structure (42) shown in the figure is a substrate structure part that connects the fin portion (45) consisting of two plate-like fins (45a) and the lower ends of the two plate-like fins (45a). It consists of (46).

The fin portion (45) has two plate-like fins (45
The upper reinforcing part (49) connecting the upper end part of a) and the two intermediate reinforcing parts (50) connecting the intermediate parts of the two plate fins (45a).
Are provided.

Regarding the constitution of the board constituting portion (46), in the first embodiment, the joining fitting concave portion (27) and the joining fitting convex portion (2
8) is provided for each two, the difference is that the number is one each. That is, on the right side surface of the board constituting portion (46), there is provided one joining fitting concave portion (47) extending in the front and rear direction and having a rectangular cross section.
On the left side surface of (46), there is provided one joining fitting convex portion (48) having a rectangular cross section which is fitted into the joining fitting concave portion (47). Similar to the fitting mating concave portion (27) and the mating fitting convex portion (28) shown in FIG. 5, the cross section of the fitting mating concave portion (47) has obtuse isosceles triangles on both upper and lower sides. Convex ridges extending back and forth (53)
3 are provided in a sawtooth shape, and the fitting protrusions (4
On both the upper and lower sides of 8), the concave stripes (54) with the same cross section as the convex stripes (53)
Are provided in a sawtooth shape by three. The upper and lower widths of the joining fitting convex portion (48) are slightly smaller than the upper and lower widths of the joining fitting concave portion (47) not including the ridge (53), and the joining fitting concave portion ( It is made larger than the distance between the upper and lower ridges (53) of (47).

The structure of the upper reinforcing part (49) is the same as that of the above-mentioned board forming part (46). That is, the upper reinforcement (4
The right side of (9) is provided with a fitting recess (51) with a rectangular cross section extending in the front and back, and the left side of the upper reinforcing part (49) is fitted into this fitting recess (51). A fitting mating convex part (52) having a square cross section is formed.The convex part (52) having an obtuse isosceles triangular cross section is formed on both upper and lower surfaces of the mating fitting concave part (51). 55) are provided in a saw-tooth shape in threes, and on both upper and lower surfaces of the fitting protrusion for joining (52), there are three sawtooth-like recesses (56) having the same cross section as the protrusions (55). It is provided. The upper and lower widths of the joining fitting convex portion (52) are slightly smaller than the upper and lower widths of the joining fitting concave portion (51) which does not include the convex stripe (55), and the joining fitting concave portion ( It is larger than the distance between the upper and lower ridges (55) of 51).

Therefore, when the heat sink constituents (42) of the third embodiment are stacked, the fitting convex portions for joining are to be laminated.
(48) (52) cannot be manually fitted into the fitting mating recesses (47) (51), but if a press or the like is used, the mating protrusions (48) (52) will be fitted together. It can be forcibly fitted into the recesses (47) (51), and the protrusions (53) (55) of the fitting recesses (47) (51) and the fitting protrusions (48) (52) for joining The recessed ridges (54) and (56) are tightly fitted to each other to prevent the stopper from coming off. in this way,
In the heat sink structure (42) of the third embodiment, the fin portion
Since the upper reinforcing portion (49) of (45) is fitted to each other not for positioning but for joining, the heat sink structure (42)
Mechanical joining is performed at two places above and below, and stronger joining is performed. Moreover, in the first and second embodiments, the fitting recesses (7) and (27) and the fitting projections (8) and (28) of the board component parts (6) and (26) are forcibly fitted before being fitted. ) Is not completely fitted, only the fitting recesses (11) (31) and the fitting projections (12) (32) of the fins (5) (25) are completely fitted, When many heat sink structures (2) and (22) are laminated, the heat sink structure (42) of the third embodiment tends to have a fan shape as a whole. Fitting projections (48) (52) and fitting recesses (47) on both 46) and fin (45) sides
Since the (51) and the (51) are not completely fitted, the heat sink constituents (42) are stacked in a substantially parallel state,
The laminated heat sink structure (42) maintains the rectangular parallelepiped shape as a whole. Therefore, the stacking work and the fitting work thereafter can be easily performed.

In the above-described first to third embodiments, the plate-like fins (5a) (25a) (45) of each heat sink structure (2) (22) (42).
Although the number of sheets a) is two or three, the number of plate fins may be one or four or more. When the heat sink is composed of two or three heat sink components (2) (22) (42) of plate fins (5a) (25a) (45a), the heat sink consists of one heat sink component. The number of heat sink components (2), (22), and (42) is smaller than that of the heat sink component. And the manufacturing cost can be reduced.

Also, the engaging projections and recesses are not limited to the shapes shown in FIG.
Various shapes can be used. FIG. 6 shows a modification of the convex stripes and the concave stripes.

In FIG. 6, three concave ridges (74) each having an isosceles right triangle whose cross section has a hypotenuse to the left are formed on the upper surface of the fitting recess (67) of the board constituting portion (66). It is provided in a sawtooth shape, and on the lower surface thereof, three concave stripes (74) whose cross section is a right-angled isosceles triangle having an oblique side to the left are provided in a sawtooth shape. On both upper and lower surfaces of the fitting protrusion for joining (68),
Three convex stripes (73) each having a right-angled isosceles triangle whose cross section has a hypotenuse to the left are provided in a sawtooth shape.

The upper and lower widths of the joining fitting convex portion (68) including the convex strip (73) are slightly larger than the vertical width of the joining fitting concave portion (67) not including the concave strip (74). Has been done. Therefore,
The fitting protrusion (68) cannot be manually fitted into the fitting recess (67), but if a press or the like is used, the fitting protrusion (68) will not fit into the fitting recess.
Can be forced into (67). As a result, the ridge (74) of the mating recess (67) and the ridge (73) of the mating protrusion (68)
It fits snugly in the box and prevents it from coming off. This retaining is due to the engagement between the vertical surfaces of the concave line (74) and the convex line (73) and is extremely strong.

To give specific values, the fitting recess for joining (6
7) has a vertical width of 3.1 mm and a depth of 4.3 mm that does not include the recessed line (74), and the recessed line (74) has a width other than that provided at the opening edge. 1.2 mm and depth of 0.5 m
m, the groove (74) provided at the opening edge has a width of 0.7 mm and a depth of 0.3 mm, and the groove (74) on the upper surface and the groove on the lower surface
Distance between bottoms of (74) = upper and lower width of fitting recess (67) is 4.
1 mm. The joining fitting convex portion (68) has a vertical width of 3.9 mm including the convex strip (73) and a height of 4.0 mm.
(73) has a width of 1.2 mm and a height of 0.5 mm.

In the second to fourth embodiments, the fitting concave portions (27) (47) (51) (67) and the fitting convex portions (28).
Regarding the dimensions of (48), (52), and (68), as in the first embodiment, 0 <depth of fitting recesses (27), (47), (51), and (67) -fitting projection (28) ) (48) (52) (68) height ≦ 0.3mm… (1) 0 <Vertical width of fitting recesses (27) (47) (51) (67) -fitting projection (28) ( It is preferable that the vertical width of 48, 52, 68 is ≦ 0.2 mm (2).

[0048]

According to the heat sink of the present invention, the adjacent shape members are pressed by a press or the like,
The fitting convex part is forcibly fitted into the fitting concave part, and after fitting, the convex strip and the concave strip are engaged with each other to prevent disengagement, and the heat sink constituents are mechanically joined to each other. Therefore, the manufacturing cost required for joining by brazing can be reduced, and various problems caused by brazing can be solved.

One of the opposing surfaces of the fin portion is provided with a joining fitting concave portion, and the other is provided with at least one joining fitting convex portion forcibly fitted therein. The convex ridges extending in the front and back are formed on the upper and lower side surfaces of one of the fitting concave portion and the fitting convex portion, and are engaged with the upper and lower side surfaces of the other side to fit the fitting convex portion. In the case where at least one recessed line is provided to prevent the escape from the fitting recess, the fitting protrusion and the fitting recess are formed on both the board component side and the fin side during the stacking work during manufacturing. Since the heat sink components are not completely fitted to each other, the heat sink components are stacked in a substantially parallel state, and the stacked heat sink components are maintained in a rectangular parallelepiped shape as a whole, which is easy to manufacture.

If the depth of the fitting recess for joining is larger than the height of the fitting protrusion for joining and the difference is 0.3 mm or less, the fitting recess and the fitting protrusion are separated from each other. When they are fitted together, a gap is prevented from being generated between the upper and lower ends of the adjacent board components, and the cutting between the bottom surface of the fitting concave portion and the top surface of the fitting convex portion is performed during cutting. It is also possible to prevent the formation of a large gap in which oil accumulates.

Further, the vertical width of the joining fitting concave portion is larger than the upper and lower width of the joining fitting convex portion, and the difference between them is 0.
When the thickness is 2 mm or less, the fitting concave portion and the fitting convex portion are easily fitted to each other, and it is possible to prevent the upper and lower heights of the board constituting portion from expanding and the plate-like fin from being deformed accordingly. In addition, the heat conduction performance after fitting does not deteriorate.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a heat sink according to the present invention.

FIG. 2 is a front view showing one heat sink constituent body and a brazing filler metal constituting the heat sink of the first embodiment.

FIG. 3 is a front view showing a second embodiment of the heat sink structure.

FIG. 4 is a front view showing a third embodiment of the heat sink structure.

FIG. 5 is an enlarged front view showing an example of the configuration of the joint portion of the heat sink according to the present invention.

FIG. 6 is an enlarged front view showing another example of the configuration of the joint portion of the heat sink according to the present invention.

[Explanation of symbols]

 (1) Heat sink (2) (22) (42) Heat sink assembly (3) Fin assembly (4) Board (5) (25) (45) Fin section (6) (26) (46) Board section ( 7) (27) (47) (67) Mating concave part for joining (8) (28) (48) (68) Mating convex part for joining (13) (33) (53) (63) ) (34) (54) (64)

Claims (4)

[Claims] 1. An aluminum extruded heat sink structure (2) (22) comprising fin portions (5), (25) and (45) and substrate constituent portions (6), (26) and (46) connected to the lower ends thereof. When the fin assembly (3) and the heating element mounting substrate (4) connected to the lower end of the fin assembly (3) are formed by stacking and joining the (42), the adjacent substrate constituent parts ( 6) (26) (46) has mating recesses (7), (27), (47) and (67) on one of the facing surfaces, and the other on the other side, forcibly fitted. There are at least one mating projections (8) (28) (48) (68) for joining, and the fitting recesses (7) (27) (47) (67) and the fitting projections are provided. (8) (2
8) (48) (68) on one of the upper and lower sides of the other, the front and rear ridges (13) (33) (53) (73) on the other side of the upper and lower sides of the same The mating ridges (8) (28) (48) (68) prevent the ridges (1), (27) (47) (67) from coming out of the mating recesses (7) (27) (47) (67).
4) A heat sink characterized in that at least one of each of (34), (54) and (74) is provided. 2. A fitting fitting concave portion (51) on one of the facing surfaces of the fin portion (45) and a fitting fitting convex portion forcibly fitted on the other surface of the fin portion (45). At least one portion (52) is provided, and a convex strip (55) extending back and forth is provided on both upper and lower side surfaces of either the fitting concave portion (51) or the fitting convex portion (52). At least one recessed ridge (56) is provided on each of the upper and lower surfaces of the other side to prevent the fitting protrusion (52) from coming out of the fitting recess (51) by engaging with it. The heat sink according to claim 1, wherein: 3. The depth of the fitting recess for joining (7) (27) (47) (51) (67) is such that the fitting projection for joining (8) (28) (48) (52) (68). 3. The heat sink according to claim 1, wherein the heat sink is larger than the height of), and the difference is 0.3 mm or less. 4. The upper and lower widths of the fitting recesses (7) (27) (47) (51) (67) for joining are defined by the fitting projections (8) (28) (48) (52) ( The heat sink according to claim 1, 2 or 3, which is larger than the upper and lower width of 68) and has a difference of 0.2 mm or less.