JP2009238988A - Heat sink fixing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink fixing member capable of easily fitting a finned heat receiving block without fail even when variations are present in manufacturing. <P>SOLUTION: The heat sink fixing member includes an fitting hole of a predetermined form with which an end of the heat receiving block is fit, an enlarged-diameter sucking portion which is provided to a peripheral portion of the fitting hole to elastically enlarge the fitting hole at fitting, and a mounting portion for mounting on a substrate, etc. In the enlarged-diameter sucking portion, part of an outer peripheral portion of the almost circular fitting hole contains an arcuate notch portion formed while enlarged toward the outside. The enlarged-diameter sucking portion may contain a slit, formed toward outside, at a part of the outer peripheral portion of the almost circular fitting hole. The enlarged-diameter sucking portion may contain a plurality of concentric arcuate slit portions on the outside of the almost circular fitting hole. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat sink fixing member for fixing a heat receiving block provided with a radiation fin to a substrate or the like, and more particularly to a heat sink fixing member that is fixed by fitting without being joined by soldering or the like.

  Electronic components such as semiconductor elements mounted on personal computer CPUs, laser light-emitting diodes, power transistors, and other electrical and electronic devices have higher element density, higher heat generated by the elements, and effective cooling. If not applied, the elements and the like are destroyed by heat. For this reason, various methods for cooling electric / electronic elements that require cooling (hereinafter referred to as “elements to be cooled”) are applied. For example, a method of directly cooling a cooled element by attaching a cooling body such as a heat sink to the cooled element is typically known.

  As a cooling body to be attached to the element to be cooled, for example, heat radiation fins are formed on a heat receiving block made of a material having excellent heat conductivity such as a copper material or an aluminum material, and air cooled by a fan or the like. These heat receiving blocks are fixed to a substrate or the like using a fixing member.

FIG. 10 is a diagram for explaining a conventional heat sink fixing member 101. As shown in FIG. 10, the end portion of the heat receiving block 102 manufactured by extrusion molding is press-fitted into the hole 103 of the fixing member 101 manufactured by press molding such as punching, and the peripheral portion is soldered after press-fitting. It was joined by attaching. The heat receiving block 102 has a plurality of thin heat radiating fins attached to the side or upper end thereof. Usually, according to experiments, for example, when a heat receiving block having a diameter of 40 mm is about 0.1 mm larger than the size of the hole having a diameter of 40 mm, the heat receiving block is appropriately fitted. The fixing member is provided with an attachment portion 104 for attachment to a substrate or the like.
JP 2007-273868 A

  As described above, since the heat receiving block is formed by extrusion molding, a manufacturing error is large (for example, ± 0.3 mm in the case of φ40 mm). On the other hand, the fixing member is formed by press molding. Small (for example, ± 0.05 mm for φ40 mm). If an end of such a heat receiving block is to be press-fitted into the hole of the fixing member, even if it is manufactured based on the design value, it may not be able to fit properly due to manufacturing variations.

  Accordingly, an object of the present invention is to provide a heat sink fixing member capable of easily and surely fitting a heat receiving block with fins even if there is a manufacturing variation.

  The inventor has intensively studied to solve the above-described conventional problems. As a result, if a diameter-enlarged absorption part that elastically expands the fitting hole part at the time of fitting is provided around the fitting hole part of the fixing member, even if there is a manufacturing variation, the fitting hole part It has been found that it can be easily and reliably fitted since the elastically expands.

Further, the diameter-absorbing absorption part is formed by a part of the outer periphery of the substantially circular fitting hole part being expanded outward, and a part of the outer periphery of the fitting hole part 3 outside. A plurality of concentric arcuate slits formed on the outside of the fitting hole, an annular protrusion formed by drawing on the outer periphery of the fitting hole 3, or It has been found that these combinations can be easily formed. The present invention has been made based on the research results described above.

  According to a first aspect of the heat sink fixing member of the present invention, the heat sink fixing member includes a fitting hole portion having a predetermined shape to which an end portion of the heat receiving block is fitted, and a peripheral portion of the fitting hole portion. The heat sink fixing member includes a diameter-enlarged absorption portion that elastically expands the fitting hole portion and an attachment portion for attachment to a substrate or the like.

  According to a second aspect of the heat sink fixing member of the present invention, the diameter-absorbing absorbing portion includes an arc-shaped notch formed by expanding a part of an outer peripheral portion of the substantially circular fitting hole portion to the outside. A heat sink fixing member provided.

  According to a third aspect of the heat sink fixing member of the present invention, the diameter expansion absorbing portion includes a slit formed toward the outside in a part of the outer peripheral portion of the circular fitting hole portion. It is a fixing member.

  A fourth aspect of the heat sink fixing member according to the present invention is the heat sink fixing member, wherein the diameter expansion absorbing portion includes a plurality of concentric arc-shaped slit portions outside the circular fitting hole portion. It is.

  A fifth aspect of the heat sink fixing member according to the present invention is a heat sink fixing member in which a connecting portion communicating between the adjacent arc-shaped slit portions is parallel to a line toward the center of the circle.

  A sixth aspect of the heat sink fixing member according to the present invention is a heat sink fixing member in which a connecting portion that communicates between the adjacent arc-shaped slit portions is obliquely crossed with a line toward the center of the circle.

  A seventh aspect of the heat sink fixing member according to the present invention is a heat sink fixing member further comprising a concentric drawing portion having a spring function, which is provided outside the circular fitting hole. .

  An eighth aspect of the heat sink fixing member according to the present invention is a heat sink fixing member in which the drawing is made of an annular groove formed in a convex shape on the substrate side.

  A ninth aspect of the heat sink fixing member of the present invention is a heat sink fixing member in which the arcuate slit portion is formed in communication with the slit.

  According to a tenth aspect of the heat sink fixing member of the present invention, the heat sink fixing member further includes an arcuate cutout portion formed on the outer side between the adjacent slits.

An eleventh aspect of the heat sink fixing member according to the present invention is the heat sink fixing member, wherein the enlarged diameter absorbing portion has a flange structure formed on an outer peripheral portion of the fitting hole portion.

  A twelfth aspect of the heat sink fixing member according to the present invention is a heat sink fixing member in which the heat receiving block is formed by extrusion molding and the heat sink fixing member is formed by press molding.

According to the heat sink fixing member of the present invention, the enlarged diameter absorbing portion that elastically expands the fitting hole portion at the time of fitting is provided in the peripheral portion of the fitting hole portion having a predetermined shape to which the end portion of the heat receiving block is fitted. Since it is provided, the enlarged-diameter absorbing portion provides a spring structure, and even if there is a variation in the size of the end portion of the heat receiving block and the size of the heat sink fixing member, it can be easily and reliably fitted.

In the above-described enlarged diameter absorption part, a part of the outer peripheral part of the substantially circular fitting hole part is formed on the outer side of the arcuate cutout part formed by expanding the outer part of the fitting hole part 3 and the outer part. A plurality of concentric arcuate slits formed on the outside of the fitting hole, an annular protrusion formed by drawing on the outer periphery of the fitting hole 3, or Since it is formed by a combination of these, it is possible to easily form the enlarged diameter absorbing portion.

  Hereinafter, various aspects of the heat sink fixing member of the present invention will be described in detail with reference to the drawings.

  According to one aspect of the heat sink fixing member of the present invention, a fitting hole having a predetermined shape into which an end of the heat receiving block is fitted, and a fitting hole provided at the periphery of the fitting hole, This is a heat sink fixing member provided with a diameter-enlarged absorption part that expands the part elastically and an attachment part for attachment to a substrate or the like.

  That is, the heat sink fixing member includes a leg portion having an attachment portion attached to a substrate or the like, and a main body having a fitting hole portion into which an end portion of the heat receiving block is fitted. The heat receiving block consists of metal blocks of various shapes such as cylindrical shape and polygonal column shape (the cross-sectional shape is round, ellipse, square, rhombus, etc.), and it is usually horizontally or vertically on the side of the heat receiving block. A plurality of thin plate-like heat radiation fins are attached. The heat sink fixing member is made of a metal having excellent thermal conductivity, such as copper or aluminum, by press molding such as punching. More preferably, when priority is given to mechanical properties, the steel material can be manufactured by press molding. Usually, an error in manufacturing a fitting hole of φ40 mm is about ± 0.05 mm.

  FIG. 1 is a view for explaining a main body of one embodiment of a heat sink fixing member of the present invention. As shown in FIG. 1, the main body 2 of the heat sink fixing member is provided with a fitting hole portion 3, and the fitting hole portion is elastically enlarged at the peripheral portion 4 of the fitting hole portion 3 during fitting. An enlarged diameter absorbing portion 5 is provided.

  In the aspect shown in FIG. 1, the diameter-enlarged absorption portion is formed by an arc-shaped cutout portion 15 that is formed such that a part of the outer peripheral portion 4 of the generally circular fitting hole portion 3 is expanded outward. When the end of the generally cylindrical heat receiving block is press-fitted into the fitting hole 3, the outer peripheral portion 4 of the fitting hole 3 between the two adjacent arcuate cutouts 15 is elastically deformed to have an outer diameter. Expands. As a result, even if there are variations in the dimensions of the end portions of the heat receiving block and the dimensions of the heat sink fixing member, they can be easily and reliably fitted.

  In this way, only by providing the arcuate cutout portion 15 that is formed to expand outward on a part of the fitting hole part 3, for example, a part on the diagonal line of the outer peripheral part, A diameter-enlarged absorption part that elastically expands the diameter is obtained. Instead of the arcuate notch 15 formed to expand outward, a slit formed outward may be formed in a part of the outer periphery of the generally circular fitting hole 3.

  Also in this case, when the end of the generally cylindrical heat receiving block is press-fitted into the fitting hole 3, the outer peripheral part 4 of the fitting hole 3 between two adjacent slits exhibits elasticity. The outer diameter of the fitting hole 3 is enlarged. As a result, even if there are variations in the dimensions of the end portions of the heat receiving block and the dimensions of the heat sink fixing member, they can be easily and reliably fitted.

FIG. 2 is a diagram illustrating a main body according to another embodiment of the heat sink fixing member of the present invention. As shown in FIG. 2, the main body 2 of the heat sink fixing member is provided with a fitting hole 3, and the fitting hole is elastically expanded in the peripheral part 4 of the fitting hole 3 at the time of fitting. An enlarged diameter absorbing portion 5 is provided. In this embodiment, the diameter expansion absorbing portion 5 includes a plurality of concentric arcuate slit portions 6 outside the generally circular fitting hole portion. That is, a connecting portion 7 is provided to connect between the adjacent arc-shaped slit portions 6 of the plurality of arc-shaped slit portions 6 formed outside the fitting hole portion, and both end portions 16 of the connecting portion 7 are It is generally parallel to the line toward the center of the circle.

  In this way, by providing a plurality of arc-shaped slit portions outside the fitting hole portion and providing a connecting portion that connects adjacent arc-shaped slit portions, the gap between the arc-shaped slit portion 6 and the fitting hole portion 3 is provided. The formed outer peripheral portion of the fitting hole portion 3 is supported by the connecting portion to exhibit a spring function, and the outer diameter of the fitting hole portion 3 is enlarged. As a result, even if there are variations in the dimensions of the end portions of the heat receiving block and the dimensions of the heat sink fixing member, they can be easily and reliably fitted.

  FIG. 3 is a diagram illustrating a main body according to another embodiment of the heat sink fixing member of the present invention. As shown in FIG. 3, the main body 2 of the heat sink fixing member is provided with a fitting hole portion 3, and the fitting hole portion is elastically expanded in the peripheral portion 4 of the fitting hole portion 3 during fitting. An enlarged diameter absorbing portion 5 is provided. In this embodiment, as described with reference to FIG. 2, the diameter expansion absorbing portion 5 includes a plurality of concentric arc-shaped slit portions 6 outside the generally circular fitting hole portion.

  In this embodiment, the number of connecting portions 7 that connect the arc-shaped slit portions is different. The size (ie, width) of the outer peripheral portion of the fitting hole portion 3 formed between the arc-shaped slit portion 6 and the fitting hole portion 3 and the number of connecting portions that connect the arc-shaped slit portion are appropriately determined. By adjusting, the elasticity of the heat sink fixing member can be increased.

  FIG. 4 is a view for explaining a main body according to another embodiment of the heat sink fixing member of the present invention. As shown in FIG. 4, the main body 2 of the heat sink fixing member is provided with a fitting hole portion 3, and the fitting hole portion is elastically expanded in the peripheral portion 4 of the fitting hole portion 3 during fitting. An enlarged diameter absorbing portion 5 is provided. In this aspect, as described with reference to FIGS. 2 and 3, the diameter expansion absorbing portion 5 includes a plurality of concentric arc-shaped slit portions 6 outside the generally circular fitting hole portion. In this aspect, the shape of the connection part which connects an arc-shaped slit part differs.

  That is, the line along the both sides of the connecting portion 7 that communicates between the adjacent arc-shaped slit portions 6 crosses the line toward the center of the circle. The size (that is, the width) of the outer periphery of the fitting hole 3 formed between the arc-shaped slit 6 and the fitting hole 3, and the number of connecting parts that connect the arc-shaped slit, The elasticity of the heat sink fixing member can be increased by adjusting the shape of the connecting portion.

  FIG. 5 is a perspective view for explaining another embodiment of the heat sink fixing member of the present invention. As shown in FIG. 5, the heat sink fixing member 1 is provided in a fitting hole portion 3 having a predetermined shape to which an end portion of the heat receiving block is fitted, and a peripheral portion of the fitting hole portion 3, and when fitted. A diameter-enlarged absorption portion 5 that elastically expands the fitting hole portion 3 and an attachment portion 9 for attachment to a substrate or the like are provided. That is, the heat sink fixing member 1 includes a leg portion 8 having an attachment portion 9 attached to a substrate (not shown) and a body 2 having a fitting hole portion 3 into which an end portion of the heat receiving block is fitted. It is made up of.

  In this embodiment, the diameter-absorbing absorption portion 5 that elastically expands the fitting hole portion 3 at the time of fitting is fitted with an annular protrusion 11 provided on the outer peripheral portion of the fitting hole portion 3 and a substantially circular fitting. It consists of the combination with the slit 10 formed in a part of the outer peripheral part of the hole 3 toward the outside. That is, a concentric drawing portion 11 having a spring function and provided on the outside of the substantially circular fitting hole portion 3 is provided. The drawing portion 11 is composed of the annular protrusion described above.

  FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5 for explaining the drawing portion. As shown in FIG. 6, the drawing portion 11 is applied to the peripheral portion 4 of the substantially circular fitting hole portion 3. The drawing unit 11 is formed of, for example, an annular projection that protrudes toward the opposite side of the substrate. The annular convex portion is formed of a concentric circle with the substantially circular fitting hole portion 3.

  When the end portion of the heat receiving block is press-fitted into the fitting hole 3 from above in FIG. 6 by the drawing portion 11 formed in this way, the peripheral portion 4 of the generally circular fitting hole 3 is pushed downward. At this time, the annular groove portion of the drawn portion 11 located between the adjacent slits 10 has elasticity, absorbs deformation, and functions as a spring.

  FIG. 7 is a perspective view for explaining another aspect of the heat sink fixing member of the present invention. As shown in FIG. 7, the heat sink fixing member 1 is provided at a fitting hole portion 3 having a predetermined shape to which an end portion of the heat receiving block is fitted, and a peripheral portion of the fitting hole portion 3. A diameter-enlarged absorption portion 5 that elastically expands the fitting hole portion 3 and an attachment portion 9 for attachment to a substrate or the like are provided. That is, the heat sink fixing member 1 includes a leg portion 8 having an attachment portion 9 attached to a substrate (not shown) and a body 2 having a fitting hole portion 3 into which an end portion of the heat receiving block is fitted. It is made up of.

  In this aspect, the diameter expansion absorbing portion 5 that elastically expands the fitting hole 3 at the time of fitting is a plurality of concentric arc-shaped slits formed on the outer periphery of the substantially circular fitting hole 3. A portion 10, a part of the outer periphery of the generally circular fitting hole 3, a slit 10 formed toward the outside, and a part of the outer peripheral part 4 of the substantially circular fitting hole 3 outward. It consists of a combination with an arcuate cutout 5 formed in an enlarged manner.

  That is, the arc-shaped slit 6 and the fitting hole 3 are connected to the substantially central portion of the plurality of concentric arc-shaped slits 6 formed on the outer periphery of the substantially circular fitting hole 3. Is provided with a slit 10. Thus, a spring structure is provided by the combination of the arc-shaped slit portion 6 and the slit 10 formed in the main body 2.

  FIG. 8 is a plan view for explaining the details of the main body of the heat sink fixing member shown in FIG. As described above, the main body 2 of the heat sink fixing member is provided with the fitting hole portion 3, and the diameter of the fitting hole portion 3 is expanded to elastically expand the fitting hole portion when fitted to the peripheral portion 4 of the fitting hole portion 3. Absorber 5 is provided. Further, a part of the outer peripheral portion 4 of the substantially circular fitting hole 3 is formed to expand outwardly between the slits 10 formed outward on the outer peripheral portion of the substantially circular fitting hole 3. A circular arc-shaped notch 15 is formed.

  That is, the end portion of the heat receiving block press-fitted into the fitting hole portion 3 by the arcuate cutout portion 15 formed by expanding a part of the outer peripheral portion 4 of the fitting hole portion 3 to the outside, and the fitting hole There is a space between the part 3 and the end of the heat receiving block can be easily pressed into the fitting hole 3. Furthermore, when the circular arc-shaped notch 15 presses a cylindrical heat receiving block having a large diameter into the fitting hole 3, the heat receiving block pushes the portion indicated by a circle in FIG. It has a function to absorb deformation. On the other hand, as described above, the spring structure is provided by the combination of the arc-shaped slit portion 6 and the slit 10 formed in the main body 2.

  FIG. 9 is a cross-sectional view for explaining the shape of the end of the heat receiving block that is press-fitted into the fitting hole 3 formed in the main body 2 of the heat sink fixing member 1. As shown in FIGS. 9A and 9B, a tapered portion is provided at the end of the heat receiving block. FIG. 9A shows an example in which a curved tapered portion is provided. FIG. 9B shows an example in which a linear taper portion is provided. In any case, the end of the heat receiving block can be easily pressed into the fitting hole 3 formed in the main body 2 of the heat sink fixing member 1.

  In each aspect described above, if burring is performed on the peripheral portion of the fitting hole 3, the burring portion expands when the end of the heat receiving block is press-fitted, and the fitting hole of the fixing member 3 is easily enlarged. That is, the R portion (curved portion) of the portion subjected to the burring process absorbs the increase in diameter. Furthermore, when the slit formed toward the outside as described with reference to FIG. 5 is formed in the burring portion formed in this way and the peripheral portion thereof, the portion divided by the slit is easily spread, Expansion of the fitting hole 3 is further facilitated. Further, when the T-shaped slit (slits 10 and 6 are integrally formed) as described with reference to FIG. 7 is provided in the burring portion formed in this way, a spring structure Is added.

  According to the present invention, it is possible to provide a heat sink fixing member capable of easily and surely fitting the heat receiving block with fins even if there is a manufacturing variation.

FIG. 1 is a view for explaining a main body of one embodiment of a heat sink fixing member of the present invention. FIG. 2 is a diagram illustrating a main body according to another embodiment of the heat sink fixing member of the present invention. FIG. 3 is a diagram illustrating a main body according to another embodiment of the heat sink fixing member of the present invention. FIG. 4 is a view for explaining a main body according to another embodiment of the heat sink fixing member of the present invention. FIG. 5 is a perspective view for explaining another embodiment of the heat sink fixing member of the present invention. FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5 for explaining the drawing portion. FIG. 7 is a perspective view for explaining another aspect of the heat sink fixing member of the present invention. FIG. 8 is a plan view for explaining the details of the main body of the heat sink fixing member shown in FIG. FIG. 9 is a cross-sectional view for explaining the shape of the end of the heat receiving block that is press-fitted into the fitting hole 3 formed in the main body 2 of the heat sink fixing member 1. FIG. 10 is a diagram for explaining a conventional heat sink fixing member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat sink fixing member 2 Main body of heat sink fixing member 3 Fitting hole part 4 Outer peripheral part of fitting hole part 5 Arc-shaped notch part 6 Arc-shaped slit part 7 Connection part 8 Leg part 9 Attaching part 10 Slit 11 Drawing part DESCRIPTION OF SYMBOLS 12 Curved taper part of edge part of heat receiving block 13 Linear taper part of edge part of heat receiving block 15 Arc-shaped notch part 16 Both ends of connecting part 101 Conventional heat sink fixing member 102 Heat receiving block 103 Hole part 104 Attachment Part

Claims (12)

  A fitting hole portion having a predetermined shape to which an end portion of the heat receiving block is fitted, and a diameter-absorbing portion that is provided in a peripheral portion of the fitting hole portion and elastically expands the fitting hole portion when fitted. And a heat sink fixing member provided with an attachment portion for attachment to a substrate or the like.   2. The heat sink fixing member according to claim 1, wherein the enlarged-diameter absorbing portion includes a circular arc-shaped notch portion in which a part of an outer peripheral portion of the substantially circular fitting hole portion is expanded outward. .   3. The heat sink fixing member according to claim 1, wherein the diameter expansion absorbing portion includes a slit formed outwardly in a part of an outer peripheral portion of the substantially circular fitting hole portion.   2. The heat sink fixing member according to claim 1, wherein the enlarged diameter absorption portion includes a plurality of concentric arcuate slit portions outside the substantially circular fitting hole portion.   The heat sink fixing member according to claim 4, wherein the connecting portion that communicates between the adjacent arc-shaped slit portions is parallel to a line toward the center of the circle.   The heat sink fixing member according to claim 4, wherein a connecting portion that communicates between the adjacent arc-shaped slit portions obliquely intersects with a line toward the center of the circle.   The heat sink fixing member according to claim 3, further comprising a concentric drawing portion having a spring function, which is provided outside the circular fitting hole portion.   The heat sink fixing member according to claim 7, wherein the drawing process includes an annular groove formed in a convex shape on the substrate side.   The heat sink fixing member according to claim 4, wherein the arcuate slit portion is formed in communication with the slit.   The heat sink fixing member according to claim 9, further comprising an arcuate cutout portion that is formed to expand outward between the adjacent slits. 11. The heat sink fixing member according to claim 1, wherein the enlarged diameter absorbing portion has a flange structure formed on an outer peripheral portion of the fitting hole portion.   The heat sink fixing member according to any one of claims 1 to 10, wherein the heat receiving block is formed by extrusion molding, and the heat sink fixing member is formed by press molding.

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