JP7294234B2 - cooling structure - Google Patents

Description

The present invention relates to a cooling structure for cooling heat generating parts of various devices.

Some cooling structures are configured as follows. That is, the cooling structure has a heat-generating part having a heat-generating body, a heat-dissipating part whose temperature is lower than that of the heat-generating part, and a heat conductor interposed between the heat-generating part and the heat-radiating part. The heat transfer body has a frame and a plurality of fins projecting from the frame in a cantilever manner and standing obliquely with respect to the frame. The frame is in contact with the heat radiating section, and the tip of each fin is in contact with the heat generating section. Therefore, the heat transfer body transfers heat generated in the heat generating portion to the heat dissipating portion through the fins and the frame. As a document showing such a technique, there is the following Patent Document 1.

JP-A-10-260230

In the cooling structure described above, it is preferable to shorten the fins in the projecting direction in order to improve the heat transfer performance of the heat transfer body. By shortening the fins in the projecting direction, the heat transfer distance can be shortened. Furthermore, by shortening the fins in the protruding direction, the number of fins can be increased, and the total contact area between the heat generating portion and all the fins can be increased.

On the other hand, the size of the gap between the heat generating part and the heat radiating part varies due to differences in standards and due to dimensional accuracy. ) is required. When trying to secure the interference with low repulsion, it is preferable to lengthen the fin in the projecting direction. This is because the longer the fins are lengthened in the projecting direction, the smaller the spring constant of the fins, so that the interference of the heat transfer body can be ensured with low repulsion.

Thus, in the above structure, when trying to improve the heat transfer performance, it is preferable to shorten the fins in the projecting direction. Preferably, the fins are lengthened in the protruding direction. Therefore, in the above configuration, if the heat transfer performance is given priority, securing the interference for low repulsion is sacrificed, and if priority is given to securing the interference for low repulsion, the heat transfer performance is sacrificed.

The present invention has been made in view of the above circumstances, and a main object of the present invention is to make it possible to achieve both securing of interference with low resilience and improvement of heat transfer performance.

A cooling structure of the present invention includes a heat generating section having a heat generating body, a heat radiating section whose temperature is lower than that of the heat generating section, and a heat conductor interposed between the heat generating section and the heat radiating section. The heat conductor is provided with a plurality of fins. Hereinafter, the widest surface of the fin is defined as the fin surface, and the size direction of the distance is defined as the distance direction. The fin surfaces are inclined with respect to a virtual plane orthogonal to the spacing direction.

In the following description, a vertical direction is defined as a direction extending along the fin surface toward the spacing direction side, and a horizontal direction is defined as a direction crossing the vertical direction along the fin surface. is the direction around the horizontal axis.

The heat transfer body has a spring portion that supports both ends of each of the fins in the horizontal direction. The fins are urged in the direction around the horizontal axis by the elastic force of the spring portion. As a result, the first end portion of the fin as one end portion in the vertical direction is pressed against the heat generating portion, and the second end portion of the fin as the other end portion in the vertical direction is pressed against the heat radiating portion. ing.

According to the invention, both lateral ends of each fin are supported by spring portions. Due to the elastic force of the spring portion, both ends of the fin in the vertical direction are pressed against the heat generating portion and the heat radiating portion. The elastic force can be suppressed by thinning or lengthening the spring portion regardless of the configuration of the fins, such as the length of the fins in the vertical direction. Further, by suppressing the elastic force of the spring portion, it is possible to secure the interference of the heat transfer body with low repulsion.

Therefore, by suppressing the elastic force of the spring portion, it is possible to make the fins advantageous for heat transfer, such as by shortening the fins in the vertical direction, while securing the interference of the heat transfer body with low repulsion. . Therefore, according to the present invention, it is possible to achieve both securing of interference with low repulsion and improvement of heat transfer performance.

Side cross-sectional view of the cooling structure of the first embodiment viewed in the lateral direction FIG. 2 is a perspective view showing a heat transfer body of the cooling structure of FIG. 1; Perspective view showing the manufacturing procedure of the heat transfer body Side view showing different angles of heat transfer fins Side view of the fins and their surroundings viewed laterally Side sectional drawing which looked at the cooling structure of 2nd Embodiment in the horizontal direction Side sectional drawing which looked at the cooling structure of 3rd Embodiment in the horizontal direction The perspective view which shows the heat-transfer body of 4th Embodiment. Front cross-sectional view of the cooling structure seen in the fin arrangement direction The perspective view which shows the heat-transfer body of 5th Embodiment. A plan view showing the manufacturing stage of the heat transfer body of FIG. The perspective view which shows the heat-transfer body of 6th Embodiment. A plan view showing the manufacturing stage of the heat transfer body of FIG.

Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments, and can be modified as appropriate without departing from the gist of the invention.

[First embodiment]
First, the gist of this embodiment will be described. As shown in FIG. 1, the cooling structure 91 is interposed between the heat generating portion 20 having the heat generating body 25, the heat radiating portion 40 having a lower temperature than the heat generating portion 20, and the gap g between the heat generating portion 20 and the heat radiating portion 40. and a heat transfer body 30 having a

In the following, according to the drawings, the direction of the size of the gap g is referred to as the "vertical direction Z", the predetermined direction orthogonal to the vertical direction Z is referred to as the "front-rear direction Y", and the direction orthogonal to both the vertical direction Z and the front-rear direction Y. is "horizontal direction X". In the vertical direction Z, the side of the heating unit 20 is defined as "upper", and the side of the heat radiating unit 40 is defined as "lower". One of the longitudinal directions Y is defined as "front" and the other is defined as "rear". One of the horizontal directions X is defined as "left" and the other is defined as "right".

However, the cooling structure 91 may be installed with the top facing down, installed with the vertical direction Z described below horizontal, or installed with the front facing backward. It can be installed in any direction, such as installation with the direction Y set to the left and right, or installation with the left referred to below as the right.

As shown in FIG. 2, the heat transfer body 30 has a plurality of fins 36, a plurality of spring portions 35, and a frame 31. As shown in FIG. Each fin 36 has a rectangular plate shape and is arranged side by side in the front-rear direction Y. As shown in FIG. A plurality of spring portions 35 are arranged on both sides of each fin 36 in the lateral direction X, and each spring portion 35 moves the end portion of the fin 36 adjacent thereto in the lateral direction X to the lateral direction X of itself. supported at one end. Each frame 31 has a rectangular plate frame shape that is wide in the lateral direction X and the front-rear direction Y, and is arranged around fins 36 and spring portions 35 arranged in the front-rear direction Y. As shown in FIG. The frame 31 supports each fin 36 via the spring portion 35 by supporting the end portion of each spring portion 35 in the lateral direction X opposite to the fin 36 side.

Positioning holes 32 passing through the frame 31 in the vertical direction Z are formed at two diagonal corners of at least one of the four corners of the frame 31 when viewed in the vertical direction Z. As shown in FIG. The heat transfer body 30 is positioned in the horizontal direction X and the front-rear direction Y by inserting predetermined inserting bodies such as screws and pins into the positioning holes 32 at the two corners.

Hereinafter, the widest surfaces of the frame 31, that is, the upper and lower surfaces are referred to as "frame surfaces 31s", and the widest surfaces of the fins 36 are referred to as "fin surfaces 36s". Also, hereinafter, the direction of rotation about the horizontal direction X is referred to as the "horizontal axis direction R". The fin surface 36s is inclined in the direction R around the horizontal axis with respect to the frame surface 31s. Hereinafter, the direction orthogonal to the horizontal direction X along the fin surface 36s, that is, the direction along the fin surface 36s in the vertical direction Z side and diagonally with respect to the vertical direction Z will be referred to as the “vertical direction Zy”. .

Each fin 36 is longer in the lateral direction X than in the longitudinal direction Zy. The spring portion 35 has a rod-like shape whose longitudinal direction is the horizontal direction X. The cross-sectional area of the spring portion 35 when viewed in the horizontal direction X is larger than the cross-sectional area of the fin 36 when viewed in the horizontal direction X. small.

Hereinafter, a state in which no external force is applied to the heat transfer body 30 is referred to as a "natural state." The stress generated in the spring portion 35 when one end of the spring portion 35 in the horizontal direction X is twisted with respect to the other end in the direction R around the horizontal axis from the natural state by a predetermined angle is is less than the stress generated in the fins 36 when one end of a length section equal to the length of the horizontal direction X of is twisted at the predetermined angle in the direction R around the horizontal axis with respect to the other end of the length section. The elastic force of the spring portion 35 urges the fin 36 in the direction R around the horizontal axis.

As a result, as shown in FIG. 5, the first end 361 of the fin 36 as one end in the vertical direction Zy is pressed against the heat generating portion 20, and the second end of the fin 36 as the other end in the vertical direction Zy is pushed. The portion 365 is pressed against the heat radiating portion 40 .

A first end portion 361 of the fin 36 is formed with a first inclined surface 362 oblique to a virtual plane perpendicular to the vertical direction Zy. The first inclined surface 362 is in parallel contact with the lower surface of the heat generating portion 20 . A second inclined surface 366 is formed on the second end portion 365 of the fin 36 so as to be inclined with respect to a virtual plane perpendicular to the longitudinal direction Zy. The second inclined surface 366 is in parallel contact with the upper surface of the heat radiating section 40 . Then, as shown in FIG. 1 , grease G is filled between the fins 36 at the distance g between the heat generating portion 20 and the heat radiating portion 40 .

Next, the details of the present embodiment will be described by supplementing the essential configuration of the present embodiment described above.

FIG. 1 is a side cross-sectional view of the cooling structure 91 viewed in the lateral direction X. FIG. The cooling structure 91 has a housing that accommodates the heat generating section 20 and the heat conductor 30 inside. The housing is composed of an upper cover 10 and the above-described heat radiating section 40 as a lower cover. The heating part 20 is composed of a substrate 22 and a heating element 25 mounted on the lower surface of the substrate 22 . A first end portion 361 of each fin 36 of the heat transfer body 30 is in contact with the lower surface of the heat generating body 25 . The heating element 25 is arbitrary, but examples thereof include a semiconductor such as gallium nitride. A coolant path 44 for flowing a coolant is provided in the heat radiating portion 40 . The coolant passage 44 may be, for example, a water passage through which cooling water flows, or a passage through which gas flows.

FIG. 2 is a perspective view showing the heat transfer body 30. FIG. The heat conductor 30 is a thermal interface material or the like, and is made of metal such as aluminum or copper in this embodiment. As described above, the heat transfer body 30 has the frame 31 , the plurality of spring portions 35 and the plurality of fins 36 , and the frame 31 is provided with the positioning holes 32 .

The fins 36 have the same shape, and the spring portions 35 have the same shape. Each spring portion 35 supports a substantially center portion in the longitudinal direction Zy of the end portion in the lateral direction X of the fin 36 . Although the spring portion 35 has a square prism shape in the drawing, it may have another shape such as a column shape. If the spring portion 35 has a quadrangular prism shape, there is an advantage that the spring portion 35 can be easily processed. On the other hand, if the spring portion 35 has a cylindrical shape, there is an advantage that the force is likely to be applied evenly around the center line of the spring portion 35 .

FIG. 3 is a perspective view showing the manufacturing procedure of the heat conductor 30. FIG. First, as shown in FIG. 3(a), a metal plate M as a material for the heat conductor 30 is prepared. Next, the metal plate M is punched out by a press or the like to form a prototype of the heat transfer body 30 shown in FIG. 3(b). The prototype of the heat transfer body 30 has a frame 31 , positioning holes 32 , spring portions 35 and fins 36 . In the prototype of this heat conductor 30, each fin surface 36s is parallel to the frame surface 31s. From this state, as shown in FIG. 3C, each spring portion 35 is twisted and bent so that each fin surface 36s is inclined with respect to the frame surface 31s, thereby completing the heat transfer body 30. .

4A to 4C are side views showing different angles of the fins 36 in the heat transfer body 30. FIG. The thickness T of the heat conductor 30 in the vertical direction Z can be adjusted by adjusting the angle of the fin surface 36s with respect to the frame surface 31s. Specifically, as shown in FIG. 4A, when the angle of the fin surface 36s with respect to the frame surface 31s is decreased, the thickness T of the heat transfer body 30 in the vertical direction Z is decreased. On the other hand, as shown in FIG. 4C, when the angle of the fin surface 36s with respect to the frame surface 31s is increased, the thickness T of the heat transfer body 30 in the vertical direction Z is increased. The thickness T of the heat conductor 30 in the vertical direction Z is set to be slightly larger than the gap g between the heat generating portion 20 and the heat radiating portion 40 in the natural state. When the heat transfer member 30 is interposed in the gap g between the heat generating portion 20 and the heat dissipating portion 40, the spring portion 35 bends (twists) in the direction R around the horizontal axis from the natural state. The thickness T of the heat transfer body 30 in the vertical direction Z becomes the same as the gap g.

FIG. 5(a) is a side view of the fins 36 and their surroundings in the lateral direction X of the present embodiment. As described above, the first inclined surface 362 and the second inclined surface 366 are formed at both ends 361 and 365 of the fin 36 in the longitudinal direction Zy. , contact the lower surface of the heat generating portion 20 and the upper surface of the heat radiating portion 40 in parallel. As a result, both ends 361 and 365 of the fin 36 are in surface contact with the lower surface of the heat generating section 20 and the upper surface of the heat radiating section 40 .

FIG. 5B is a side view of the heat transfer body 30 of the comparative example and its surroundings viewed in the horizontal direction X. FIG. In this comparative example, both end faces 363 and 367 of the fin 36 in the longitudinal direction Zy are parallel to a virtual plane perpendicular to the longitudinal direction Zy, and the end faces 363 and 367 are aligned with the lower surface of the heat generating portion 20 and the heat dissipating portion. 40 obliquely abuts on the upper surface thereof. Thereby, the ends of the end surfaces 363 and 367 are in line contact with the lower surface of the heat generating section 20 and the upper surface of the heat radiating section 40 . Compared with this comparative example, in the present embodiment shown in FIG. The contact area with the end portion 365 is increased.

Below, the effect related to the implementation of claim 1 as originally filed is defined as the first effect, the effect related to the implementation of claim 2 as originally filed is defined as the second effect, and so on. Effects related to implementation are referred to as third to fourteenth effects, respectively.

According to this embodiment, the following first effect is obtained. As shown in FIG. 2 , both ends of each fin 36 in the lateral direction X are supported by spring portions 35 . Both end portions 361 and 365 of the fin 36 in the vertical direction Zy are pressed against the heat generating portion 20 and the heat radiating portion 40 by the elastic force of the spring portion 35 . The elastic force can be suppressed by thinning or lengthening the spring portion 35 regardless of the configuration of the fins 36 such as the length of the fins 36 in the vertical direction Zy. By suppressing the elastic force of the spring portion 35, the interference of the heat transfer body 30 can be ensured with low repulsion.

Therefore, by suppressing the elastic force of the spring portion 35, the fins 36 are configured to be advantageous for heat transfer, such as by shortening the fins 36 in the vertical direction Zy while securing the interference of the heat transfer body 30 with low repulsion. can be Therefore, according to the present embodiment, it is possible to achieve both securing of interference with low repulsion and improvement of heat transfer performance.

Moreover, the following second effect can also be obtained. The stress generated in the spring portion 35 when one end of the spring portion 35 in the horizontal direction X is twisted with respect to the other end in the direction R around the horizontal axis by a predetermined angle from the natural state is It is smaller than the stress generated in the fin 36 when one end of the length section equal to the length of the lateral direction X of 35 is twisted at the predetermined angle in the direction R around the lateral axis with respect to the other end of the length section. Therefore, the stress of the spring portion 35 can be suppressed while suppressing the length of the spring portion 35 in the horizontal direction X.

Moreover, the following third effect can also be obtained. The fins 36 are longer in the horizontal direction X than in the vertical direction Zy. Therefore, the heat transfer distance can be efficiently shortened, and the contact area between the heat transfer body 30 and the heat generating part 20 and the contact area between the heat transfer body 30 and the heat radiation part 40 can be increased. Therefore, the heat transfer performance of the heat transfer body 30 is improved.

In addition, the following fourth effect can also be obtained. As shown in FIG. 5A, the first inclined surface 362 of the fin 36 is inclined with respect to a virtual plane orthogonal to the longitudinal direction Zy and is in parallel contact with the lower surface of the heat generating portion 20. As shown in FIG. Therefore, as shown in FIG. 5B, the end surface 363 of the fin 36 is parallel to the imaginary plane, and the end surface 363 is in contact with the lower surface of the heat generating portion 20 at an angle. and the contact area with the fin 36 can be increased. Therefore, this also improves the heat transfer performance of the heat transfer body 30 .

Moreover, the following fifth effect is also obtained. As shown in FIG. 5A, the second inclined surface 366 of the fin 36 is inclined with respect to a virtual plane perpendicular to the longitudinal direction Zy and abuts the upper surface of the heat radiating section 40 in parallel. Therefore, as shown in FIG. 5B, the end surface 367 of the fin 36 is parallel to the imaginary plane, and the end surface 367 is in contact with the upper surface of the heat radiating section 40 at an angle. and the contact area with the fin 36 can be increased. Therefore, this also improves the heat transfer performance of the heat transfer body 30 .

In addition, the following sixth effect can also be obtained. As shown in FIG. 1 , grease G is filled between the fins 36 at the distance g between the heat generating portion 20 and the heat radiating portion 40 . Therefore, the heat of the heat generating portion 20 is transmitted to the heat radiating portion 40 by the fins 36 and is also transmitted to the heat radiating portion 40 by the grease G between the fins 36 . Therefore, also by this, the heat transfer performance of the cooling structure 91 can be improved.

In addition, the following seventh effect is also obtained. As shown in FIG. 2, the cross-sectional area of the spring portion 35 viewed in the horizontal direction X is smaller than the cross-sectional area of the fin 36 viewed in the horizontal direction X. As shown in FIG. Thereby, the elastic force of the spring portion 35 per unit length can be suppressed. Therefore, the stress of the spring portion 35 can be suppressed while the length of the spring portion 35 is suppressed.

In addition, the following eighth effect can also be obtained. The heat transfer body 30 has a frame 31 , and the frame 31 supports each fin 36 via the spring portion 35 by supporting each spring portion 35 . Therefore, the plurality of fins 36 can be put together by the frame 31 .

In addition, the following ninth effect can also be obtained. Positioning holes 32 are formed in two diagonal corners of at least one of the four corners of the frame 31 . The heat transfer body 30 is positioned within the cooling structure 91 by inserting an insertion body such as a pin or a screw into each of the positioning holes 32 at the two corners. Therefore, positioning of the cooling structure 91 can be easily realized. Also, if each positioning hole 32 is configured to be positioned at a plurality of positions, the heat transfer body 30 can be appropriately positioned at any one of the plurality of positions.

[Second embodiment]
Next, a second embodiment will be described. In the following embodiments, members that are the same as or correspond to those in the previous embodiments are denoted by the same reference numerals. However, the cooling structure itself is given a different reference numeral depending on the embodiment. This embodiment will be described based on the first embodiment, focusing on points that differ from this.

FIG. 6 is a side cross-sectional view of the cooling structure 92 of this embodiment as viewed in the horizontal direction X. As shown in FIG. The heating element 25 is mounted not on the bottom surface of the substrate 22 but on the top surface of the substrate 22, and the heat transfer element 30 is installed directly below it.

According to this embodiment, the heat generated by the heating element 25 can be radiated to the heat radiating section 40 via the substrate 22 and the heat conductor 30 .

[Third embodiment]
Next, a third embodiment will be described. This embodiment will be described based on the second embodiment, focusing on the differences therefrom. FIG. 7 is a side cross-sectional view of the cooling structure 93 of this embodiment as viewed in the lateral direction X. FIG. The heating element 25 is mounted inside the substrate 22 instead of on the upper surface of the substrate 22, and the heat transfer element 30 is installed directly below it.

Also according to the present embodiment, the heat generated by the heating element 25 can be radiated to the heat radiating section 40 via the substrate 22 and the heat conductor 30 .

[Fourth embodiment]
Next, a fourth embodiment will be described. The present embodiment will be described based on the first embodiment, focusing on the differences therefrom. FIG. 8 is a perspective view showing the heat transfer body 30 of the cooling structure 94 of this embodiment. A plurality of rectangular plate-like fins 36 are arranged not only in the front-rear direction Y but also in the lateral direction X. As shown in FIG. Although two fins 36 are arranged side by side in the horizontal direction X in the drawing, three or more fins 36 may be arranged side by side.

The fins 36 adjacent to each other in the lateral direction X are connected via a connecting spring portion 37 . Among the plurality of fins 36 arranged in the horizontal direction X, the left end portion of the left end fin 36 and the right end portion of the right end fin 36 are supported by the spring portion 35 of the first embodiment. Therefore, at least one end of each fin 36 in the lateral direction X is supported by the spring portion 35 via the connecting spring portion 37 and the other fins 36 .

The fins 36 have the same shape, and the connecting spring portions 37 have the same shape. Each connecting spring portion 37 is connected to a substantially central portion in the longitudinal direction Zy of the end portion in the lateral direction X of the fin 36 . Each connecting spring portion 37 has a rod-like shape whose longitudinal direction is the horizontal direction X. As shown in FIG. Although each connecting spring portion 37 has a square columnar shape in the figure, it may have another shape such as a columnar shape.

The cross-sectional area of the cross section of the connection spring portion 37 viewed in the lateral direction X is smaller than the cross-sectional area of the cross section of the fin 36 viewed in the lateral direction X. Therefore, when one end of the connecting spring portion 37 in the horizontal direction X is twisted from the natural state by a predetermined angle in the direction R around the horizontal axis with respect to the other end, the stress generated in the connecting spring portion 37 is occurs in the fins 36 when one end of the same length section as the length of the horizontal direction X of the connecting spring portion 37 in 36 is twisted at a predetermined angle in the direction R around the horizontal axis with respect to the other end of the length section. Less than stress.

Hereinafter, one of the two fins 36 connected by the connecting spring portion 37 is referred to as "first fin 36A" and the other is referred to as "second fin 36B". In the natural state, the fin surface 36s of the first fin 36A and the fin surface 36s of the second fin 36B are parallel to each other.

FIG. 9 is a front cross-sectional view of the cooling structure 94 of this embodiment as seen from the front. The size of the gap gA between the heat generating portion 20 and the heat radiating portion 40 where the first fin 36A is interposed, and the gap gB between the heat generating portion 20 and the heat radiating portion 40 where the second fin 36B is interposed differ from each other in size. Therefore, the fin surfaces 36s of the first fins 36A and the fin surfaces 36s of the second fins 36B have angles different from each other due to bending (twisting, etc.) of the connecting spring portion 37 . As a result, the thickness T of each of the fins 36A and 36B in the vertical direction Z is equal to the size of the gaps gA and gB corresponding to the fins 36A and 36B, respectively.

According to this embodiment, the following twelfth effect can be obtained. As shown in FIG. 8, the fins 36A and 36B adjacent to each other in the lateral direction X are connected via a connecting spring portion 37. As shown in FIG. Therefore, as shown in FIG. 9, the gaps gA and gB between the heat generating portion 20 and the heat dissipating portion 40 are not uniform, and the gap gA at the portion corresponding to the first fin 36A and the portion corresponding to the second fin 36B are different. Even if the gap gB is different, it can be dealt with by bending (twisting) the connecting spring portion 37 .

In addition, the following thirteenth effect can also be obtained. The cross-sectional area of the connecting spring portion 37 viewed in the horizontal direction X is smaller than the cross-sectional area of the fin 36 viewed in the horizontal direction X. As shown in FIG. Thereby, the elastic force of the connecting spring portion 37 per unit length can be suppressed. Therefore, the stress of the connecting spring portion 37 can be suppressed while reducing the length of the connecting spring portion 37 . As a result, the second fin 36B can be easily rotated with respect to the first fin 36A with low repulsion while suppressing the length of the connecting spring portion 37 .

In addition, the following 14th effect can also be obtained. As shown in FIG. 9, the size of the gap gA between the heat generating portion 20 and the heat radiating portion 40 where the first fins 36A are interposed and the heat generating portion 20 where the second fins 36B are interposed. The size of the gap gB with the heat radiating part 40 is different from each other. Therefore, by actually twisting the connecting spring portion 37, the angles of the first fins 36A and the second fins 36B can be different from each other. Therefore, the twelfth and thirteenth effects described above can be remarkably exhibited.

[Fifth embodiment]
Next, a fifth embodiment will be described. The present embodiment will be described based on the first embodiment, focusing on the differences therefrom. FIG. 10 is a perspective view showing the heat transfer body 30 of the cooling structure 95 of this embodiment.

Heat conductor 30 does not have frame 31 . The heat transfer body 30 has a left spring portion 35 that supports the left ends of all the fins 36 and a right spring portion 35 that supports the right ends of all the fins 36 .

Each of the left and right spring portions 35 has a support portion 35b that supports the end portion of each fin 36, and a connecting portion 35a that connects the support portions 35b to each other in the front-rear direction Y. As shown in FIG. That is, each supporting portion 35b of the left spring portion 35 supports the left end portion of the adjacent fin 36 with its right end portion. The connecting portion 35a of the left spring portion 35 connects the left ends of the support portions 35b of the left spring portion 35 in the front-rear direction Y. As shown in FIG. On the other hand, each supporting portion 35b of the right spring portion 35 supports the right end portion of the adjacent fin 36 with its left end portion. The connecting portion 35a of the right spring portion 35 connects the right end portions of the support portions 35b of the right spring portion 35 in the front-rear direction Y. As shown in FIG.

The connecting portion 35a of each of the left and right spring portions 35 reciprocates between the upper Z+ side and the lower Z- side of a predetermined imaginary line Ly passing through the center of gravity Ca of the connecting portion 35a and extending in the front-rear direction. It has a trajectory shape that progresses in the Y direction, that is, a trajectory shape that progresses zigzag in the front-rear direction Y. As shown in FIG. Further, each support portion 35b of each of the left and right spring portions 35 also has a locus-like shape folded back in the up-down direction Z. As shown in FIG. The left and right spring portions 35 bias the fins 36 in the direction R around the horizontal axis by the elastic forces of both the support portions 35b and the connecting portions 35a.

FIG. 11 is a plan view showing the manufacturing stage of the heat transfer body 30. FIG. A prototype of the heat transfer body 30 shown in FIG. 11 is formed by punching one sheet of metal plate by a press or the like. The heat transfer body 30 is completed by bending the connecting portion 35a and the support portion 35b of the prototype of the heat transfer body 30 at predetermined locations (locations indicated by broken lines in the figure).

According to this embodiment, the following tenth effect is obtained. Since the fins 36 are biased in the direction R around the horizontal axis by the elastic forces of both the support portions 35b and the connection portions 35a, the interference can be secured by the bending of both the support portions 35b and the connection portions 35a. Therefore, it is possible to efficiently secure a tightness with low repulsion.

[Sixth embodiment]
Next, a sixth embodiment will be described. This embodiment will be described based on the fifth embodiment, focusing on the differences therefrom. FIG. 12 is a perspective view showing the heat transfer body 30 of the cooling structure 96 of this embodiment. The support portion 35b has a trajectory shape that advances in the horizontal direction X while reciprocating between the vertical direction one Zy+ side and the vertical direction other Zy− side of an imaginary line Lx that passes through the center of gravity Cb of the support portion 35b and extends in the horizontal direction X. , that is, a trajectory shape extending in a zigzag direction in the horizontal direction X. As shown in FIG.

FIG. 13 is a plan view showing the manufacturing stage of the heat transfer body 30. FIG. A prototype of the heat transfer body 30 shown in FIG. 13 is formed by punching one sheet of metal plate by pressing or the like. The heat transfer body 30 is completed by bending the original connecting portion 35a of the heat transfer body 30 at a predetermined position (the position indicated by the broken line).

According to this embodiment, the following eleventh effect can be obtained. As shown in FIG. 12, the support portion 35b has a locus shape extending in the horizontal direction X while reciprocating between the vertical one Zy+ side and the other vertical Zy− side of the virtual line Lx. As a result, the support portion 35b is longer than when it extends straight in the horizontal direction X. As shown in FIG. As a result, the spring constant of the support portion 35b can be lowered, and the interference can be secured efficiently with low repulsion. Therefore, it is possible to secure the interference with low repulsion while suppressing the length of the connecting portion 35a. As a result, as can be seen from a comparison between the prototype of the heat transfer body 30 after punching in the fifth embodiment shown in FIG. 11 and the prototype of the heat transfer body 30 after punching in this embodiment shown in FIG. , can reduce waste in punching.

[Other embodiments]
For example, the above embodiment can be implemented by changing as follows. For example, in each embodiment, as shown in FIG. 2, the frame 31 has a rectangular plate frame shape, but may have other shapes such as a triangular plate frame shape or a circular plate frame shape. Further, for example, in each embodiment, the fins 36 have a rectangular plate shape, but they may have other shapes such as a parallelogram plate shape or a hexagonal plate shape in which both ends in the horizontal direction X protrude laterally outward. may

Further, for example, in each embodiment, the lateral direction X (that is, the direction of both ends of the fins 36 supported by the spring portions 35) corresponds to the vertical direction Z (that is, the distance g between the heat generating portion 20 and the heat radiating portion 40). direction), but may be slightly inclined with respect to the direction perpendicular to the vertical direction Z.

Further, for example, in each embodiment, the vertical direction Zy (that is, the direction of both ends of the fins 36 contacting the heat generating portion 20 and the heat radiating portion 40) is perpendicular to the horizontal direction X, but the horizontal direction It may be slightly oblique with respect to the direction orthogonal to X.

Further, for example, in each embodiment, the front-rear direction Y (that is, the direction in which the fins 36 are arranged side by side) is orthogonal to both the horizontal direction X and the vertical direction Z, but the direction orthogonal to the horizontal direction X Alternatively, it may be slightly inclined with respect to the direction orthogonal to the vertical direction Z.

Further, for example, in the first embodiment and the like, the positioning holes 32 are provided at the two corners of the frame 31, but they may be provided at the central portion of each side of the frame 31 or the like.

Further, for example, in each embodiment, each fin 36 is longer in the horizontal direction X than in the vertical direction Zy, that is, horizontally long. You can make it vertical. Even in this case, effects other than the third effect can be obtained.

Further, for example, in each embodiment, the heat transfer body 30 is made of metal, but instead of this, it may be made of resin, carbon composite material, or the like. Further, for example, in each embodiment, the heat transfer body 30 is integrally formed of the same material (metal), but instead of this, for example, the frame 31 is made of ceramic, the spring portion 35 is made of metal, Each part of the heat transfer body 30 may be made of different materials, such as the fins 36 being made of a carbon composite material.

Alternatively, for example, the heat transfer body 30 may be made of a metal whose surface is insulated, such as aluminum whose surface is anodized. According to this configuration, the lower surface of the heat generating portion 20 and the upper surface of the heat radiating portion 40 are conductors, and when the metal heat conductor 30 is interposed in the gap g between the two, insulation between the two is achieved. Even if it cannot be ensured, insulation can be ensured by the insulated portion. Therefore, it is possible to take advantage of the high heat conductivity of metal while ensuring insulation between the heat generating portion 20 and the heat radiating portion 40 . In addition, compared to the case where an insulating sheet is separately provided in addition to the metal heat transfer body 30, there is an advantage that the entire part consisting of the heat transfer body 30 and its insulating portion can be made smaller, and assembly can be facilitated. Advantages and advantages such as cost reduction can be obtained.

Further, for example, in the first embodiment and the like, the spring portion 35 is rod-shaped with the horizontal direction X as the longitudinal direction, but it may be coil-shaped. Further, for example, in each embodiment, the spring portion 35 supports substantially the central portion in the vertical direction Zy of the end portion of the fin 36 in the horizontal direction X, but supports one side or the other side in the vertical direction Zy. good too.

Further, for example, in each embodiment, as shown in FIG. 5(b), both end surfaces 363 and 367 of the fin 36 may obliquely contact the lower surface of the heat generating portion 20 and the upper surface of the heat radiating portion 40, respectively. Even in this case, effects other than the fourth and fifth effects can be obtained.

Further, for example, in the fifth embodiment, as shown in FIG. 10, the connecting portion 35a has a locus-like shape that advances in the front-rear direction Y while reciprocating between the upper Z+ side and the lower Z- side of a predetermined imaginary line Ly. doing Alternatively, the connecting portion 35a may have a locus-like shape that advances in the front-rear direction Y while reciprocating between the left side and the right side of the virtual line Ly.

Further, for example, in the sixth embodiment, as shown in FIG. 12, the support portion 35b moves in the horizontal direction X while reciprocating between the vertical direction one Zy+ side and the vertical direction other Zy− side of the predetermined imaginary line Lx. It has a trajectory shape that advances. Alternatively, the support portion 35b may have a trajectory shape that advances in the horizontal direction X while reciprocating between one side and the other side in the normal direction of the fin surface 36s from the virtual line Lx. .

DESCRIPTION OF SYMBOLS 20... Heat generating part 25... Heat generating body 30... Heat conductor 35... Spring part 36... Fin 361... First end part 365... Second end part 40... Heat dissipation part 91 to 96... Cooling structure , R: direction around the horizontal axis, X: horizontal direction, Y: front-back direction, Z: vertical direction, Zy: vertical direction.

Claims (14)

A heat-generating part (20) having a heat-generating body (25), a heat-dissipating part (40) whose temperature is lower than that of the heat-generating part, and a heat transfer interposed between the heat-generating part and the heat-radiating part (g). a body (30), the heat transfer body being provided with a plurality of fins (36),
The widest surface of the fin is defined as a fin surface, and the size direction of the distance is defined as a distance direction (Z). In the cooling structure (91-96),
The vertical direction (Zy) is a direction that advances along the fin surface toward the spacing direction side and is oblique to the spacing direction, and the horizontal direction (X) is a direction that intersects the vertical direction along the fin surface, Assuming that the direction of rotation about the horizontal direction is the direction around the horizontal axis (R),
The heat transfer body has a spring portion (35) that supports both lateral ends of each fin,
By urging the fin in the direction around the horizontal axis by the elastic force of the spring portion, the first end portion (361) of the fin as one end portion in the vertical direction is pressed against the heat generating portion, A cooling structure in which a second end (365) as the other longitudinal end of the fin is pressed against the heat radiating part. A state in which no external force is applied to the heat transfer body is taken as a natural state,
The stress generated in the spring portion when one end of the spring portion in the horizontal direction is twisted from the natural state by a predetermined angle with respect to the other end in the direction around the horizontal axis is the stress generated in the fin from the natural state. It is smaller than the stress generated in the fins when one end of a length section of the spring portion that is the same as the length in the horizontal direction is twisted at the predetermined angle in the direction around the horizontal axis with respect to the other end of the length section. , a cooling structure according to claim 1. 3. A cooling structure according to claim 1 or 2, wherein each said fin is longer in said lateral direction than in said longitudinal direction. A first inclined surface (362) oblique to a virtual plane perpendicular to the longitudinal direction is formed on the first end of the fin, and the first inclined surface is formed on the surface of the heat generating portion. A cooling structure according to any one of claims 1 to 3, in parallel abutment. The second end of the fin is formed with a second inclined surface (366) that is inclined with respect to a virtual plane orthogonal to the longitudinal direction, and the second inclined surface is aligned with the surface of the heat radiating section. A cooling structure according to any one of claims 1 to 4, in parallel abutment. The cooling structure according to any one of claims 1 to 5, wherein grease (G) is filled between the fins in the space between the heat generating portion and the heat radiating portion. The spring portion has a rod-like shape whose longitudinal direction is the lateral direction, and the cross-sectional area of the spring portion viewed in the lateral direction is the cross-sectional area of the fin viewed in the lateral direction A cooling structure according to any one of claims 1 to 6, which is smaller than. The heat transfer body has a frame (31), and the frame supports each of the fins via the spring by supporting each of the springs. 1. The cooling structure according to claim 1. When viewed in the space direction, the frame has a rectangular shape with four corners, and positioning holes (32) are formed in two diagonal corners of at least one of the four corners of the frame. 9. The cooling structure according to claim 8, wherein said heat transfer body is positioned within said cooling structure by inserting a predetermined inserting body through each of said positioning holes at least at said two corners. The plurality of fins are arranged side by side in a side-by-side direction (Y) that intersects both the spacing direction and the horizontal direction,
The spring portion has a support portion (35b) that supports each of the plurality of fins, and a connection portion (35a) that connects the support portions. and extending in the arranging direction (Y) of the fins, moving in the arranging direction while reciprocating between a predetermined direction (Z+) side and the opposite direction (Z−) side of a predetermined imaginary line (Ly). It has a locus-like shape,
The cooling structure according to any one of claims 1 to 7, wherein the spring portion biases the fins in the direction around the horizontal axis by elastic forces of both the support portion and the connecting portion. The spring portion has a support portion (35b) that supports the fin,
The support portion reciprocates between a predetermined direction (Zy+) side and an opposite direction (Zy−) side of a predetermined imaginary line (Lx) passing through the center of gravity (Cb) of the support portion and extending in the horizontal direction. , the cooling structure according to any one of claims 1 to 10, having a locus-like shape extending in the lateral direction. A plurality of the fins are arranged side by side in the horizontal direction, and the fins adjacent to each other in the horizontal direction are connected to each other via a connecting spring portion (37). The fins at both ends in the horizontal direction are supported by the spring portions,
A state in which no external force is applied to the heat transfer body is taken as a natural state,
The stress generated in the connecting spring portion when one end of the connecting spring portion in the horizontal direction is twisted from the natural state by a predetermined angle with respect to the other end in the direction around the horizontal axis is This occurs in the fin when one end of a section of the fin having the same length as the horizontal length of the connecting spring portion is twisted at a predetermined angle in the direction around the horizontal axis with respect to the other end of the length section. A cooling structure according to any one of the preceding claims, which is less than stress. The connecting spring portion has a rod-like shape whose longitudinal direction is the horizontal direction. 13. The cooling structure of claim 12, smaller than the cross-sectional area. One of the two fins connected by the connecting spring portion is a first fin (36A) and the other is a second fin (36B),
The distance (gA) between the heat generating portion and the heat radiating portion at the location where the first fin is interposed, and the distance between the heat generating portion and the heat radiating portion at the location where the second fin is interposed. 14. A cooling structure according to claim 12 or 13, wherein the sizes of the gaps (gB) are different from each other.

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