JP2006210470A - Heat dissipation structure of heating element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat dissipation structure which performs the thermal bonding of a heating element, such as an electronic apparatus, etc. easily, and which can be held in the inside of a housing in the housing in which many components of the engine room, etc. of an automobile are arranged. <P>SOLUTION: In the inside of the housing, the heating element is pushed to the housing inside, and the heating element joins thermally and is held. In the heat dissipation structure of the heating element, an operation for performing the pushing of the heating element to the housing inside is performed from the direction substantially orthogonal to the normal of the inner surface of the housing. In the heat dissipation structure of the heating element 1, the housing 3 inside which the heating element 1 is pushed, and it joins thermally is the inner surface 3b of the housing side wall 3a, and the operation for performing the pushing of the heating element 1 is carried out from the housing 3 upper part direction. The heat dissipation structure of the heating element where a heat sink 9 is formed in the outer surface 3c of the housing 3 in the inside of the back of the housing 3 in which the pushing of the heating element 1 is performed, and it joins thermally. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a heat dissipation structure that can easily accommodate a heating element such as an electronic device on the inner surface of the casing in a casing arranged in a place where many parts exist, such as an engine room of an automobile. About.

  In a poor environment such as an automobile engine room, high-precision electronic devices (such as electronic circuits formed on a printed circuit board) are placed in a plastic or metal housing for waterproofing and dustproofing. The In this case, it is necessary to cool (heat dissipate) the electronic device in order to prevent the semiconductor element constituting the electronic circuit from being thermally runaway.

  As a heat dissipation device for an electronic device housed in a housing, the electronic device is thermally bonded to a heat radiator, a support member is disposed on the back side of the electronic device, and both ends of the support member are screwed to the heat radiator. Furthermore, a heat radiating device (Patent Document 1) in which a part of the side wall of the housing is formed by the heat radiating body, or two protrusions are formed on the surface of the metal housing, and an electronic device is formed between the two protrusions. A heat dissipating device has been proposed in which a bracket is disposed above the two electronic devices, the bracket is screwed onto the tops of the two protruding portions, and the electronic device is pressed downward ( Patent Document 2).

  However, since both of these heat dissipation devices have the same screwing direction and the direction in which the heating element is pressed, for example, when the heating element is pressed against the inner surface of the housing side wall, it is screwed from the lateral direction. In a place where many parts such as an engine room of an automobile are arranged, it is extremely difficult to house the heating element in the casing by being thermally bonded to the inner surface of the casing.

Japanese Patent Laid-Open No. 7-32486 JP 2001-257485 A

  An object of the present invention is to allow a heating element such as an electronic device to be easily thermally bonded to the inner surface of the casing in a casing disposed in a place where there are a large number of parts, such as an engine room of an automobile. The object is to provide a heat dissipation structure.

  According to the first aspect of the present invention, a heating element is pressed and thermally bonded to the inner surface of the casing, and the operation of pressing the heating element against the inner surface of the casing is performed in the casing. The heat dissipating structure of the heating element is performed from a direction substantially orthogonal to the normal line.

  According to a second aspect of the present invention, the inner surface of the casing where the heating element is pressed and thermally joined is the inner surface of the casing side wall, and the operation of pressing the heating element is performed from above the casing. The heat dissipating structure for a heating element according to claim 1, wherein the heat dissipating structure is a heat dissipating structure.

  The invention according to claim 3 is characterized in that a heat radiator is provided on the outer surface on the back side of the inner surface of the side wall of the housing where the heat generator is pressed and thermally joined. This is a heat dissipation structure of the heating element.

  According to a fourth aspect of the present invention, at least two guide pins are provided on the left and right sides of the heating element at predetermined intervals in the vertical direction of the heating element, brackets are provided in the housing, and left and right sides of the bracket. Is provided with a groove for guiding the guide pin into the housing, and a branch groove is provided at a required position of the groove. The branch groove is directed downward toward the inner surface of the side wall of the housing where the heating element is thermally joined. Each of the guide pins is located in the branch groove, and a protrusion having holes A through which screws are passed is provided above both the left and right sides of the heating element. And the two holes A and B are matched, the screws are passed through the two matched holes A and B, and the screws are nuts. Screwed together, the two protrusions are A heat dissipation structure of a heating element according to any one of claims 1 to 3, characterized in that it is fastened.

  According to a fifth aspect of the present invention, the hole B is a long hole having a large diameter in the housing width direction, the nut is fixed onto a leaf spring, and the leaf spring is provided with a hole C through which a screw is passed. The nut is located in a hole B through which the screw of the bracket projection is passed, and the leaf spring is located below the hole B through which the screw of the bracket projection is passed. 4 is a heat-dissipating structure for a heating element.

  According to the first aspect of the present invention, since the heating element is pressed against the inner surface of the casing and thermally joined in the casing, the heat of the heating element is directly transmitted to the casing wall and is transmitted. The good heat is radiated well from the outer surface of the housing wall. The operation of pressing the heating element against the inner surface of the housing is performed from a direction substantially orthogonal to the normal line of the inner surface of the housing. For this reason, for example, when the heating element is pressed against the inner surface of the housing side wall, the operation can be performed from above. Therefore, even in a place where many parts such as an engine room of an automobile are arranged, the heating element can be easily joined by being thermally bonded to the inner surface of the housing side wall.

  According to a second aspect of the present invention, the inner surface of the casing where the heating element is pressed and thermally bonded is the inner surface of the side wall of the casing, and the operation of pressing the heating element is performed from above the casing. Because of the heat dissipation structure of the body, a heating element such as an electronic device is easily thermally bonded to the inner surface of the side wall of the case in a case where a large number of parts such as an engine room of an automobile are arranged. Can be accommodated.

  Since the invention according to claim 3 is a heat dissipation structure in which a heat dissipating body is provided on the outer surface on the back side of the inner surface of the housing side wall portion to which the heat generating members are thermally joined, heat dissipation from the housing is performed more favorably.

  According to a fourth aspect of the present invention, (1) at least two guide pins provided on each of the left and right sides of the heating element are fitted in the guide grooves on the left and right sides of the bracket disposed in the housing, respectively. The guide pins are positioned in at least two branch grooves that branch from the required locations of the guide grooves, and (3) holes A in the left and right upper projections of the heating element and holes B in the left and right upper projections of the bracket. , The screw is passed through the matched holes A and B, the screw is screwed into the nut, and the both projections are fastened. The body can be easily thermally bonded to the inner surface of the housing side wall.

  In the heat dissipating structure according to the fifth aspect of the present invention, since the holes B provided on the upper left and right sides of the bracket are long holes having a large diameter in the casing width direction, And the heating element is firmly and thermally bonded to the inner surface of the housing side wall. Further, the nut fixed on the leaf spring is used as the nut, and the nut is strongly screwed with the screw to generate a spring force on the leaf spring, thereby preventing the loosening of the screwing.

In the present invention, as a method of thermally bonding the heating element to the inner surface of the side wall of the housing, for example, a coil spring, a leaf spring, and the like between the heating element and the inner surface facing the inner surface to which the heating element is thermally bonded, There is a method of arranging a wedge-shaped object or the like.
The thermal bonding means that the heating element is directly bonded (adhered) to the inner surface of the housing side wall portion, and heat conduction such as silicon grease or a heat conductive rubber sheet is provided between the heating element and the inner surface of the housing side wall portion. The case where a property material (member) is interposed is also included. The rubber sheet is excellent in workability if it is attached in advance to a heating element.

  In the present invention, as the heat radiating body provided on the outer surface on the back side of the inner surface of the housing side wall portion to which the heat generating body is thermally joined, a heat radiating fin, a heat pipe or the like is recommended without taking up space.

  The heat dissipating structure of the present invention can dissipate well even if the outer surface on the back side of the inner surface of the housing, which is pressed and thermally bonded to the heat generating element, is thermally bonded to the surface of the engine room where heat is easily released. .

An embodiment of a heat dissipation structure of the present invention will be specifically described with reference to FIG. In all the drawings for explaining the present invention, the repeated explanation of the same reference numerals is omitted.
In this heat dissipation structure, as shown in FIG. 1 (a), two guide pins 2 are provided on the left and right sides of the heating element 1 at predetermined intervals in the vertical direction of the heating element 1, and a bracket is provided in the housing 3. 4 is provided, a groove 5 for guiding the guide pin 2 into the housing 3 is provided on both the left and right sides of the bracket 4, two branch grooves 5 a are provided at required positions of the groove 5, and the branch groove 5 a The heating element 1 is inclined downward toward the inner surface 3b of the housing side wall 3a to which the heating element 1 is thermally bonded. Here, the interval between the branch grooves 5 a is the same as the interval between the guide pins 2.

  Further, a protrusion 1a having holes A through which screws 6 are passed is provided above the left and right sides of the heating element 1, and a protrusion 4a having holes B through which screws 6 are passed is provided above the left and right sides of the bracket 4, respectively. Yes. The two holes A and B are made to coincide with each other, the screw 6 is passed therethrough, the screw 6 is screwed into the nut 7, and the protrusions 1a and 4a are fastened to each other.

  In the present invention, the movement of the heating element 1 in the casing width direction by screwing the screw 6 into the nut 7 is absorbed to some extent by the play between the hole B and the screw 6, but the casing width direction of the branch groove 5 a When the distance to is large, as shown in FIG. 1 (b), the hole B is formed as a long hole in the housing width direction. By doing so, the screw 6 when the screw 6 is screwed into the nut 7 is used. Is smoothly moved in the casing width direction. The long diameter of the hole B is set to the same distance as the casing width direction in which the guide pin 2 of the heating element 1 moves through the branch groove 5a.

  The nut 7 is fixed on a lower hole C ′ of the U-shaped leaf spring 8 provided with screw holes C and C ′. Since the leaf spring 8 is formed in a U shape, the leaf spring 8 can be locked to the protrusion 4 a and the screw 6 can be easily screwed into the nut 7. Here, the nut 7 has an outer diameter smaller than the width (short diameter) of the hole B, and is positioned in the hole B of the bracket protrusion 4a. Thus, if the outer diameter of the nut 7 is made smaller than the width (short diameter) of the hole B, the nut 7 can easily move in the hole B in the housing width direction.

  The nut 7 may be fixed on the screw hole C of the flat leaf spring provided with the screw hole C. A method in which the outer diameter of the nut 7 is made larger than the width (short diameter) of the hole B and no leaf spring is used is also applicable. In FIG. 1 (a), 9 is a radiation fin provided on the outer surface 3c on the back side of the inner surface 3b of the casing side wall portion where the heating element 1 is pressed and thermally joined.

Next, the method for assembling the heat dissipation structure of the present invention will be specifically described with reference to FIGS.
As shown in FIG. 2A, two guide pins provided on the left and right side surfaces of the heating element 1 are provided in the two grooves 5 and 5 provided on the left and right sides of the bracket 4 disposed in the housing 1. The two guide pins 2 and 2 are respectively lowered along the grooves 5 and 5 so that the two guide pins 2 and 2 are positioned above the two branch grooves 5a and 5a. Here, the heat radiating surface 1b of the opposing heating element 1 and the housing side wall inner surface 3b are parallel to each other.

  Next, a U-shaped leaf spring 8 is fitted into the protrusion 4a of the bracket 4, the four holes A, C, B, C ′ are matched, and screws 6 are passed through the four matched holes. Is screwed onto the nut 7. When the screwing is advanced, the branch groove 5a is inclined downward, so that the heating element 1 advances in the direction of the inner surface 3b of the housing 3 and heat is applied to the inner surface 3b of the housing as shown in FIG. Jointly. Here, since the screw hole B of the bracket protrusion 4 a is a long hole having a large diameter in the width direction of the housing 3, the screw 6 easily moves in the width direction of the housing 3. After the projecting portions 1a and 4a are fastened to each other, if the screwing is further advanced to generate a spring force on the leaf spring 8, the loosening of the screwing is prevented.

  Thereafter, the connector 10 a of the wire bundle 10 is connected to the connector 1 c of the heating element 1, and then the lid 11 is attached to the housing 3. The space between the housing 3 and the lid 11 is sealed with a rubber packing 12, and the space between the wire bundle 10 and the lid 11 is sealed with a rubber grommet 13.

  In order to take out the heating element 1 from the assembled heat dissipation structure, the lid 11 is removed, the connector 10a is removed, the screw 6 is removed from the nut 7, and the heating element 1 is pulled up. Therefore, it is not necessary to take out the casing 11, and maintenance, inspection, replacement, etc. of the heating element 1 can be easily performed.

  In the present invention, the bracket 4 can be manufactured by press molding or die casting of a metal plate, plastic injection molding, or the like.

  In the present invention, the bracket is disposed in the casing by, for example, joining the bracket to the inner wall surface of the casing by spot welding, ultrasonic welding, or the like. In addition, it can be molded integrally with the housing.

  In the present invention, the nut is fixed to the leaf spring by, for example, joining the nut to the leaf spring by spot welding, ultrasonic welding, or the like.

  In the present invention, when the heating element is an electronic device such as a printed board, cooling is more efficiently performed by thermally bonding the mounting surface of the heat source (semiconductor element or the like) to the inner surface of the housing side wall.

  In the heat dissipation structure of the present invention, for example, when the heating element is a plate-like body such as a circuit board, the housing also has a plate shape, and the plate-like housing is arranged vertically with the opening facing upward. Can be easily placed in a narrow space between parts in the engine room.

It is (a) perspective exploded explanatory drawing which shows embodiment of the thermal radiation structure of this invention, and (b) perspective explanatory drawing of a nut part. BRIEF DESCRIPTION OF THE DRAWINGS (a) Side explanatory drawing in the middle of an assembly which shows embodiment of the thermal radiation structure of this invention, (B) Side explanatory drawing after an assembly.

Explanation of symbols

1 Heating element (electronic device)
1a Heating element projection 1b Heating element heat dissipation surface 1c Heating element connector 2 Guide pins 3 provided on both sides of the heating element 3 Housing 3a Housing side wall 3b Housing side wall inner surface 3c Back side of housing inner surface 3b 4 Bracket 4a Bracket projection 5 Groove 5a provided on both sides of bracket Bracket 6 Screw 7 Nut 8 U-shaped leaf spring 9 Radiator (radiation fin)
DESCRIPTION OF SYMBOLS 10 Electric wire bundle 10a Electric wire bundle connector 11 Case lid 12 Rubber packing 13 Rubber grommet

Claims (5)

  A heating element is pressed and thermally bonded to the inner surface of the casing, and the operation of pressing the heating element against the inner surface of the casing is substantially orthogonal to the normal line of the inner surface of the casing. A heat dissipating structure for a heating element, characterized in that it is performed from the direction.   2. The inner surface of the casing where the heating element is pressed and thermally joined is the inner surface of the side wall of the casing, and the operation of pressing the heating element is performed from the upper side of the casing. The heat dissipation structure of the described heating element.   The heat dissipating structure for a heat generating element according to claim 1 or 2, wherein a heat dissipating element is provided on an outer surface on the back side of the inner surface of the side wall of the housing where the heat generating element is pressed and thermally bonded.   At least two guide pins are provided on the left and right sides of the heating element at predetermined intervals in the vertical direction of the heating element, brackets are provided in the casing, and the guide pins are provided on the left and right sides of the bracket in the casing. A branch groove is provided at a required position of the groove, and the branch groove is inclined downward toward the inner surface of the housing side wall portion to which the heating element is thermally joined, Each of the guide pins is located in the branch groove, provided with protrusions having holes A through which screws are passed above the left and right sides of the heating element, and holes B through which screws are passed above the left and right sides of the bracket. The two holes A and B are matched, a screw is passed through the two matched holes A and B, and the screws are screwed together with nuts to form both the protrusions. The parts are mutually connected Heat radiation structure of the heating element according to any one of claims 1 to 3, characterized.   The hole B is a long hole having a large diameter in the housing width direction, the nut is fixed onto a leaf spring, and the leaf spring is provided with a hole C through which a screw is passed. 5. The heat dissipating of the heating element according to claim 4, wherein the leaf spring is located below the hole B through which the screw of the bracket projection is passed. Construction.

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