JP2009092141A - Part installing structure and electric equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a part installing structure capable of separately and surely performing the fixation of a part of parts among a plurality of the parts, and the fixation of the remaining other part by maximally miniaturizing a space occupied by a fixing member, when fixing the plurality of parts of electric equipment. <P>SOLUTION: This part installing structure 30 includes a first screw 31 forming a male screw, a second screw 32 forming a male screw 41 having an outer diameter not larger than an outer diameter D1 of the first screw 31 and having the same axis L1 as that of the first screw 31, a base 33 continuing to an end 35 in one X1 of the axial direction of the first screw 31 and expanding outward more than the first screw 31 with the axis L1 as a center, a first screw-engaging member 38 screw-engaged with the first screw 31, and a second screw-engaging member 39 screw-engaged with the second screw 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a component mounting technique for fixing a plurality of components.

  For example, when a substrate and a cover body are fixed to a heat sink in the process of manufacturing an electric device, it is necessary to solder, inspect, and coat the substrate after the substrate is fixed to the heat sink. For this reason, the screw component for fixing the substrate to the heat sink cannot be shared as the screw component for fixing the cover body to the heat sink.

  FIG. 1 is a side view of a boss structure 4 for fixing a substrate 1 and a cover body 2 to a heat sink 3 in the first prior art. As this first prior art, after fixing the board 1 to the heat sink 3 with the screw parts 5, the parts on the board are soldered, and then the cover body 2 surrounding the board is different from the screw parts. A method of fixing to a heat sink by a screw component 6 is known.

  FIG. 2 is a longitudinal sectional view of the double bolt 10 according to the second prior art. As a fixing member according to the second prior art, a double bolt 11 composed of an outer bolt 11 and an inner bolt 12 is known (for example, see Patent Document 1).

JP-A-8-277825

  In the first prior art, both the screwing structure for fixing the substrate 1 to the heat sink 3 and the screwing structure for fixing the cover body 2 to the heat sink 3 are required. There is a problem that the space for providing the screwing structure for fixing the cover body 2 to the heat sink 3 can be omitted and the size cannot be reduced.

  The second prior art has a problem that even if the outer bolt 11 and the inner bolt 12 are used, both the substrate and the cover body cannot be fixed to the heat sink.

  An object of the present invention is to reduce the space occupied by the fixing member as much as possible when fixing a plurality of parts, fixing a part of the plurality of parts, and fixing the remaining other parts. It is to provide a mounting technique for parts that can be performed separately and reliably.

  According to the present invention (1), the component mounting structure includes a first screw portion in which a male screw is formed, a first screwing member screwed into the first screw portion, and an axis of the first screw portion. And a base portion extending outward in the radial direction from one screw portion. Accordingly, the first fixed member through which the first screw portion passes can be disposed and fixed between the first screwing member and the base portion. The component mounting structure includes a second screw portion and a second screwing member screwed into the second screw portion. Therefore, the second fixed member can be disposed and fixed between the second screw member and the base by screwing the second screw member into the second screw member.

  Further, the first fixed member and the second fixed member can be fixed with a screw structure of the same axis. Accordingly, the space occupied by the fixing member is reduced as compared with the case where the fixing member for fixing the first fixed member to the base and the fixing member for fixing the second fixed member to the base are provided separately. can do.

  According to the present invention (1), when the first fixed member and the second fixed member are fixed, the space occupied by the component mounting structure can be made as small as possible. Further, since the first screwing member and the second screwing member are provided separately, the first fixed member can be reliably fixed separately from the fixing of the second fixed member.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, parts corresponding to matters already described in the forms preceding each form may be denoted by the same reference numerals, and overlapping descriptions may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

<First Embodiment>
FIG. 3 is a cross-sectional view of the component mounting structure 30 according to the first embodiment of the present invention. The component mounting structure 30 according to the first embodiment is, for example, a fixing member that fixes a plurality of components of an electrical device with a fixing member. The plurality of fixed members fixed by the component mounting structure 30 are electrical components that constitute an electrical device. The plurality of fixed members include a first fixed member and a second fixed member.

  The component mounting structure 30 includes a first screw portion 31, a second screw portion 32, a first screwing member 38, a second screwing member 39, and a base portion 33. The first screw portion 31 is formed with a male screw that penetrates the first fixed member 42. The second screw portion 32 is a portion where a screw having the same axis as that of the first screw portion 31 for fixing the second fixed member 42 is formed. The first screwing member 38 is a member screwed into the first screw part 31, and the second screwing member 39 is a member screwed into the second screw part 32.

  The second screw portion 32 has the same axis L1 as the first screw portion 31, and a male screw 41 having an outer diameter equal to or smaller than the outer diameter D1 of the male screw of the first screw portion 31 is formed. The base 33 is connected to one end X1 of the first screw portion 31 in the axial direction, and is formed in a shape that extends outward in the radial direction from the first screw portion 31 around the axis L1.

  The member 38 screwed into the first screw part 31 is referred to as “first screwing member”. The member 39 that is screwed into the second screw portion 32 is referred to as a “second screwing member”. In the first embodiment, since the screw formed in the second screw portion 32 is the male screw 41, the second screwing member 39 that is screwed into the second screw portion 32 is also referred to as a “second screwing female screw member”. .

  A fixed member 42 that is disposed between the first screwing member 38 and the base portion 33 and is fixed by screwing the first screwing member 38 into the first screw portion 31 is referred to as a “first fixed member”. The fixed member 43 that is disposed between the second screw member 39 and the base portion 33 and is fixed by screwing the second screw member 39 into the second screw portion 32 is referred to as a “second fixed member”. ". In the first embodiment, the second fixed member 43 is disposed between the second screwed female screw member 39 and the base 33, and the second screwed female screw member 39 penetrates the second fixed member 43. It is fixed by being screwed into the second screw portion 32, and is also referred to as a “penetrated member”.

  The axis L1 of the male screw formed in the first screw part 31 is simply referred to as “axis”, and the direction X of the axis L1 is referred to as “axis direction”. Of the two orientations in the axial direction X, the orientation X1 from the first screw portion 31 toward the base portion 33 is referred to as “one axial direction”. Of the two orientations in the axial direction X, from the base portion 33 to the first screw portion 31. The heading direction X2 is referred to as “the other axial direction”.

  In 1st Embodiment, the screw formed in the 2nd screw part 32 has the same axis line L1 as the 1st screw part 31, and has the outer diameter of the external thread smaller than the external diameter D1 of the external thread of the 1st screw part 31. It is the male screw 41 which has. The second screw portion 32 is continuous with the end portion 36 of the other X2 in the axial direction of the first screw portion 31.

  The component mounting structure 30 includes a first screw portion 31 in which a male screw is formed, and a base portion 33 that extends radially outward from the first screw portion 31 around the axis L1 of the first screw portion 31. Composed. The first fixed member 42 in which a through-hole through which the first screw portion 31 can penetrate is disposed and fixed between the first screwing member 38 and the base portion 33. The component mounting structure 30 includes a second screw portion 32. The second screw portion 32 is formed as a male screw 41, and the penetration fixed member 43 in which a through-hole through which the second screw portion 32 can be formed is disposed between the second screwing female screw member 39 and the base portion 33. Fixed.

  The first fixed member 42 and the penetration fixed member 43 are fixed with a screw structure of the same axis. As a result, the fixing member occupies as compared with the case where the fixing member for fixing the first fixed member 42 to the base 33 and the fixing member for fixing the penetrating fixed member 43 to the base 33 are provided separately. Reduce the space. In addition, it is possible to perform processing on the first fixed member 42 in a state in which the first fixed member 42 is fixed in a stage before fixing the penetration fixed member 43.

  Since the first fixed member 42 can be fixed separately from the fixing of the penetration fixed member 43, a jig for positioning the first fixed member until the penetration fixed member 43 is fixed. Can be omitted. The second screw portion 32 is formed with a male screw 41 having the same axis L1 as the first screw portion 31 and having an outer diameter smaller than the outer diameter D1 of the first screw portion 31. The second screw portion 32 is formed by being connected to the other end X2 end portion 36 of the first screw portion 31 in the axial direction. A surface perpendicular to the axial direction X is formed in a region where the second screw portion 32 is not formed in the other end portion X2 of the first screw portion 31 in the axial direction. The inner diameter of the through hole of the penetration fixed member 43 is smaller than the outer diameter D <b> 1 of the first screw portion 31. The penetration fixed member 43 is arranged and fixed between the surface perpendicular to the axial direction X described above of the end 36 of the other axial direction X2 of the first screw portion 31 and the second screwing member 39. The penetration fixed member 43 is fixed without contacting the first screwing member 38 and the first fixed member 42.

  The load acting on the first fixed member 42 is prevented from acting on the penetration fixed member 43, and the load acting on the penetration fixed member 43 is prevented from acting on the first fixed member 42. In addition, the loosening of the screwing of the first screwing member 38 and the first screw part 31 does not weaken the fixing force for fixing the penetration fixed member 43. In addition, the fixing force for fixing the first fixed member 42 is not weakened by loosening the screwing of the second screwing female screw member 39 and the second screw portion 32. After the first fixed member 42 is arranged and fixed between the first screwing member 38 and the base portion 33, the penetration fixed member 43 is fixed on the same side as the first fixed member 42 with respect to the base portion 33.

  In the first embodiment, the electric device is configured as an electronic control unit (ECU) mounted on a vehicle such as an automobile, for example, and has a heat sink having a structure for facilitating heat dissipation, and at least an electric circuit and an electronic circuit. It includes a substrate on which either one is formed, a component mounted on the substrate and connected to a circuit, and a cover body. The base 33 according to the first embodiment is a heat sink, the first fixed member 42 is a substrate, and the penetration fixed member 43 is a cover body. The cover body 43 and the heat sink 33 protect the substrate 42 from both sides in the thickness direction of the substrate 42. Further, the heat sink 33 diffuses heat from a component that generates heat among components mounted on the substrate 42 to the external space of the cover body 43 and the heat sink 33.

  The heat sink 33 is generally formed as a flat plate-like member, and is formed in a substantially rectangular shape when the heat sink 33 is viewed in the thickness direction. In the heat sink 33, a first screw portion 31 and a second screw portion 32 are formed in each portion near the four corners of the rectangle. The four first screw portions 31 and the four second screw portions 32 are formed with the thickness direction of the heat sink 33 as the axial direction X of the first screw portion 31 and the second screw portion 32. Therefore, the axial direction X coincides with the thickness direction of the heat sink 33. The four first screw portions 31 and the four second screw portions 32 are formed to protrude in the other axial direction X2 of the heat sink 33.

  The substrate 42 is generally formed as a flat plate-like member, and is formed in a substantially rectangular shape when the substrate 42 is viewed in the thickness direction. The rectangular size of the substrate 42 viewed from the thickness direction is substantially the same as the rectangular size of the heat sink 33 viewed from the same direction. A through hole is formed in each portion of the substrate 42 near the four corners of the rectangle. The substrate 42 is disposed on the other axial direction X2 of the heat sink 33 with its thickness direction coinciding with the axial direction X. The four through holes formed in the substrate 42 are formed corresponding to the first screw portions 31 formed in the heat sink 33. The inner diameters of the four through holes formed in the substrate 42 are set larger than the outer diameter D1 of the male screw of the first screw part 31, and the inner diameter of the through hole of the substrate 42 and the outer diameter D1 of the male screw of the first screw part 31 are set. Is set to 0.1 millimeter (millimeters, abbreviation “mm”) or more and 20 mm or less. The first screw portion 31 can penetrate through the through hole formed in the substrate 42.

  The larger the difference between the inner diameter of the through hole formed in the substrate 42 and the outer diameter D1 of the male screw of the first screw portion 31, the larger the difference in the size of the substrate 42 when the first screw portion 31 penetrates the substrate 42. The change of the position with respect to the heat sink 33 becomes large, and the positioning accuracy of the substrate 42 with respect to the heat sink 33 decreases. The smaller the difference between the inner diameter of the through hole formed in the substrate 42 and the outer diameter D1 of the male screw of the first screw portion 31, the smaller the difference between the first screw portion 31 and the substrate 42 when passing through the substrate 42. Friction between the portion defining the through hole formed in the substrate 42 and the first screw portion 31 is increased, and it is difficult to penetrate the first screw portion 31 through the substrate 42. By making the difference between the inner diameter of the through hole of the substrate 42 and the outer diameter D1 of the male screw of the first screw portion 31 within the above range, the first screw portion 31 can be easily passed through the through hole of the substrate 42. And the positioning accuracy of the board | substrate 42 with respect to the heat sink 33 can be made high.

  A flat surface 47 facing the substrate 42 is formed on the cover body 43, and the flat surface 47 facing the substrate 42 is formed facing one axial direction X1. An outer surface 48 of the cover body 43 is formed on the other X2 of the cover body 43 in the axial direction of the plane 47 facing the substrate 42. The outer surface 48 of the cover body 43 is a plane parallel to the plane 47 facing the substrate 42. The outer surface 48 of the cover body 43 is formed facing the other axial direction X2. The cover body 43 is formed in a substantially rectangular shape when viewed in the axial direction X. The rectangular size of the cover body 43 viewed from the axial direction X is substantially the same as the rectangular size of the substrate 42 and the heat sink 33 viewed from the same direction. Similarly to the cover body 44 of the second embodiment described later shown in FIG. 6C, the peripheral wall 52 is formed so as to protrude from the portion forming each side of the rectangle around the cover body 43 in the axial direction X1. Is done.

  The peripheral wall 52 is configured to include four flat portions, and the four flat portions correspond to the sides of the rectangle. Hereinafter, a flat plate portion formed on the peripheral wall 52 corresponding to each rectangular side of the cover body 43 is referred to as a “flat plate portion”. The flat plate-like portion 53 in the vicinity of the four corners of the rectangle is connected to the cover body corner portion 54 formed in a flat plate shape having the axial direction X in the thickness direction in the cover body 43.

  The cover body corner portion 54 is a part of the portion of the cover body 43 that is located at the most axial direction X1. The cover body corner portion 54 is formed at the same position in the axial direction X as the portion of the peripheral wall 52 that is located in the most axial direction X1. Four cover body corners 54 are formed in one cover body 43 corresponding to the four corners of the rectangle. Each cover body corner 54 is formed with one through hole penetrating in the axial direction X. The four through holes formed in the four cover body corner portions 54 correspond to the second screw portions 32 formed in the heat sink 33. The inner diameters of the four through holes formed in the cover body corner portion 54 are set larger than the outer diameter D3 of the male screw 41 of the second screw portion 32, and the inner diameter of the through hole of the cover body corner portion 54 and the second screw portion. The difference from the outer diameter D3 of the 32 male screws 41 is set to 0.1 mm or more and 20 mm or less. The second screw portion 32 can penetrate through the through hole of the cover body corner portion 54.

  The larger the difference between the inner diameter of the through hole formed in the cover body corner portion 54 and the outer diameter D3 of the male screw 41 of the second screw portion 32, the more the second screw portion 32 penetrates the cover body corner portion 54. In this case, the change in the position of the cover body corner portion 54 with respect to the heat sink 33 increases, and the positioning accuracy of the cover body 43 with respect to the heat sink 33 decreases. The smaller the difference between the inner diameter of the through-hole formed in the cover body 43 and the outer diameter D3 of the male screw 41 of the second screw portion 32, the smaller the cover when the second screw portion 32 passes through the cover body 43. Friction between the portion of the body 43 that defines the through-hole formed in the cover body corner portion 54 and the second screw portion 32 is increased, and it is difficult to allow the second screw portion 32 to penetrate the cover body 43. By setting the difference between the inner diameter of the through hole of the cover body corner portion 54 and the outer diameter D3 of the male screw 41 of the second screw portion 32 within the above range, the second screw portion 32 is formed in the through hole of the cover body corner portion 54. Can be easily penetrated, and the positioning accuracy of the cover body 43 with respect to the heat sink 33 can be increased.

  A flat surface 56 perpendicular to the axial direction X and facing the other axial direction X2 is formed on the other axial direction X2 of the heat sink 33. From each corner of the heat sink 33, the first screw part 31 is formed protruding in the other axial direction X 2, and from the first screw part 31, the second screw part 32 is formed protruding further in the other axial direction X 2. One end X1 of the first screw portion 31 in the axial direction X1 is connected to the other flat surface 56 of the heat sink 33 in the axial direction X2. The end portion 36 of the other X2 in the axial direction of the first screw portion 31 is connected to the end portion 61 of the one X1 in the axial direction of the second screw portion 32.

  Each of the first screw portion 31 and the second screw portion 32 is a member in which a male screw is formed on a substantially cylindrical member. The outer diameter D1 of the male screw of the first screw part 31 is larger than the outer diameter D3 of the male screw 41 of the second screw part 32, and the first screw part 31 and the second screw part 32 have the same straight line as the axis line L1 in the axial direction. Lined up with X. A plane that is perpendicular to the axial direction X and faces the other axial direction X2 is formed at the end 62 of the other axial direction X2 of the second screw portion 32. The male screw formed in the first screw part 31 and the second screw part 32 is formed as a right-handed metric thread.

  Each of the first screwing member 38 and the second screwing female screw member 39 is a nut. The first screwing member 38 can be screwed to the first screw part 31, and the second screwing female screw member 39 can be screwed to the second screw part 32. When the first screw member 38 is screwed into the first screw portion 31, the first fixed member 42 is fixed between the first screw member 38 and the base portion 33. In a state where the first fixed member 42 is fixed between the first screwing member 38 and the base portion 33, the length of the first screw portion 31 in the axial direction X is equal to the thickness of the first fixed member 42 and the first fixed member 42. The length of the one screwing member 38 in the axial direction X is longer than the total length.

  When the second screwed female screw member 39 is screwed into the second screw part 32, the penetration fixed member 43 is fixed between the second screwed female screw member 39 and the first screw part 31. The length of the second screw portion 32 in the axial direction X is longer than the thickness of the penetration fixed member 43. In the state in which the penetration fixed member 43 is fixed between the second threaded female screw member 39 and the first screw portion 31, the length in the axial direction X of the second screw portion 32 is the thickness of the penetration fixed member 43. And the total length of the second threaded female screw member 39 in the axial direction X are substantially the same. The length of the second screw portion 32 in the axial direction X is set to be longer than the total length of the thickness of the penetration fixed member 43 and the length of the second threaded female screw member 39 in the axial direction X. You may make it the edge part of the other X2 of the axial direction of the part 32 protrude.

  When fixing the first fixed member 42, the first screw portion 31 is inserted into a through hole formed in the first fixed member 42. As a result, the first fixed member 42 is positioned with respect to the heat sink 33. In this state, the first screw member 38 is screwed into the first screw portion 31 from the other axial direction X2 of the first fixed member 42. By performing this operation with the four first screw portions 31, the first fixed member 42 is sandwiched and fixed between the base portion 33 and the first screwing member 38. The first screwing member 38 is screwed into the first screw portion 31 by being rotated by a spanner or a monkey spanner.

  The surface perpendicular to the axial direction X of the cover body corner 54 is larger than the size of the nut that is the second threaded female screw member 39 when viewed in the axial direction X. When fixing the cover body 43 which is the penetration fixed member 43, the second screw portion 32 is inserted into the through hole formed in the cover body corner portion 54. Accordingly, the cover body 43 is positioned with respect to the heat sink 33. In this state, the second screw female screw member 39 is screwed into the second screw portion 32 from the other axial direction X2 of the penetration fixed member 43. By performing this operation with the four second screw portions 32, the cover body 43 is sandwiched and fixed between the first screw portion 31 and the second threaded female screw member 39. The second screwed female screw member 39 is screwed into the second screw portion 32 by being rotated with a spanner or a monkey spanner.

  In a state where the first fixed member 42 is fixed to the heat sink 33, the surface of the substrate 42, which is the first fixed member 42, of the one axial direction X <b> 1 faces the other axial direction X <b> 2 of the heat sink 33. 56. As a result, heat generated when at least one of the electronic component and the electrical component mounted on the substrate 42 generates heat is transmitted from the substrate 42 to the heat sink 33 and diffused. This heat diffusion prevents a local temperature rise of the heat-generating component.

  In the state where both the first fixed member 42 and the through-hole fixed member 43 are fixed to the heat sink 33, the surface facing the substrate 42 formed on the cover body 43 is the substrate 42 and the electronic component mounted on the substrate 42. And it is arrange | positioned in the other axial direction X2 rather than the board | substrate 42, without touching an electrical component. The cover body corner portion 54 is in contact with the end portion 36 of the other X2 in the axial direction of the first screw portion 31. The cover body corner 54 is disposed away from the first screwing member 38. The cover body 43 and the substrate 42 are arranged apart from each other. The space between the cover body 43 and the substrate 42 is continuous with the space outside the cover body 43 and the heat sink 33, and the heat of the air located in the space between the cover body 43 and the substrate 42 It diffuses into the external space through the gap with 42.

  According to the first embodiment, the component mounting structure 30 includes a first screw portion 31 in which a male screw is formed, and an outer side in the radial direction than the first screw portion 31 with the axis L1 of the first screw portion 31 as a center. And a base portion 33 that spreads out. As a result, the first fixed member 42 in which a through hole through which the first screw portion 31 can be formed is disposed between the first screwing member 38 and the base portion 33 and can be fixed. The component mounting structure 30 includes a second screw portion 32. The second screw portion 32 is formed with a male screw 41 having the same axis L1 as the first screw portion 31 and having an outer diameter smaller than the outer diameter D1 of the first screw portion 31. Accordingly, it is possible to arrange and fix the penetration fixed member 43 in which the through hole through which the second screw portion 32 can penetrate is disposed between the second screwing female screw member 39 and the base portion 33.

  Further, the first fixed member 42 and the penetration fixed member 43 can be fixed with a screw structure of the same axis. As a result, the fixing member occupies as compared with the case where the fixing member for fixing the first fixed member 42 to the base 33 and the fixing member for fixing the penetrating fixed member 43 to the base 33 are provided separately. Space can be reduced. Therefore, the size of the electrical device in which a plurality of electrical components are fixed by the component mounting structure 30 can be further reduced. In addition, while the plurality of members are fixed to the same axis as described above, the first fixed member 42 and the through-fixed member 43 are individually formed by the first screw member 38 and the second screw member 39, respectively. Fixed. Therefore, the process for the first fixed member 42 can be performed at a stage before fixing the penetrating fixed member 43 in a state where the first fixed member 42 is securely fixed.

  Moreover, when fixing the 1st to-be-fixed member 42 and the penetration to-be-fixed member 43, the space which the attachment structure 30 for components occupies can be reduced as much as possible. Moreover, since the 1st to-be-fixed member 42 can be fixed in the step before fixing the penetration to-be-fixed member 43, the position of the 1st to-be-fixed member 42 is performed until the penetration to-be-fixed member 43 is fixed. Therefore, it is possible to omit a jig for the purpose. Further, when fixing the penetration fixed member 43, the penetration fixed member 43 can be stably disposed by inserting the second screw portion 32 into the through hole of the penetration fixed member 43. It is also possible to omit a jig for performing positioning. The first fixed member 42 can be reliably fixed separately from the fixing of the penetration fixed member 43.

  According to the first embodiment, the second screw portion 32 is formed with the male screw 41 having the same axis L1 as the first screw portion 31 and having an outer diameter smaller than the outer diameter D1 of the first screw portion 31. Is done. The second screw portion 32 is formed by being connected to the other end X2 end portion 36 of the first screw portion 31 in the axial direction. Since the inner diameter of the through hole of the penetration fixed member 43 is smaller than the outer diameter D <b> 1 of the first screw portion 31, the end 36 in the other axial direction X <b> 2 of the first screw portion 31 and the second screwing member 39. The penetration fixed member 43 can be disposed and fixed therebetween.

  The length of the first screw portion 31 in the axial direction X is longer than the total length of the thickness of the first fixed member 42 and the length of the first screwing member 38 in the axial direction X. Thus, when the penetration fixed member 43 is fixed between the second threaded female screw member 39 and the base 33, the penetration fixed member 43 is separated from the first screwing member 38 and the first fixed member 42. The through-fixed member 43 can be arranged and fixed by the above.

  Therefore, the load acting on the first fixed member 42 is prevented from acting on the penetration fixed member 43, and the load acting on the penetration fixed member 43 is prevented from acting on the first fixed member 42. Can do. Further, since the screwing of the first screwing member 38 and the first screw part 31 is loosened, the fixing force for fixing the penetration fixed member 43 is not weakened. Further, since the screwing of the second screwing female screw member 39 and the second screw part 32 is loosened, the fixing force for fixing the first fixed member 42 is not weakened. After the first fixed member 42 is disposed and fixed between the first screw member 38 and the base portion 33, the penetration fixed member 43 is fixed to the same side as the first fixed member 42 with respect to the base portion 33. it can.

  The cover body corner portion 54 is disposed away from the first screwing member 38 and is disposed away from the substrate 42. Thereby, the outside air of the cover body 43 can pass through the gap between the cover body 43 and the substrate 42. Therefore, the heat from the component that generates heat mounted on the substrate 42 can be diffused to the outside air.

  FIG. 4 is a flowchart showing the steps of the component fixing method according to the first embodiment of the present invention. The component fixing method according to the first embodiment is, for example, a method of fixing a plurality of components of an electric device with a fixing member. The method of fixing the parts is simply referred to as “fixing method”. Specifically, the fixing method is a method of fixing the first fixed member 42 and the penetration fixed member 43 with a fixing member. In the first embodiment, the fixing member is the heat sink 33, the first fixed member 42 is the substrate, and the penetration fixed member 43 is the cover body.

  The fixing method according to the first embodiment has a first screw portion 31 on which a male screw is formed, the same axis L1 as the first screw portion 31, and an outer diameter equal to or smaller than the outer diameter D1 of the first screw portion 31. The second screw portion 32 in which the male screw 41 is formed and one end X1 of the first screw portion 31 in the axial direction are connected to the X 35 end portion, and are radially outward from the first screw portion 31 around the axis L1. This is a fixing method using the component mounting structure 30 including the base 33 that expands. The fixing method includes a first fixed member arranging step, a first screwing member arranging step, a second fixed member arranging step, and a second screwing female screw member arranging step.

  The first fixed member arranging step is a step of inserting the first screw portion 31 into the through hole of the first fixed member 42 in which a through hole through which the first screw portion 31 can pass is formed. The first screwing member arranging step is a step of screwing the first screwing member 38 screwed into the first screw part 31 into the first screw part 31 from the side opposite to the base 33 with respect to the first fixed member 42. is there. The second fixed member arranging step is a step of inserting the second screw portion 32 into the through hole of the through-fixed member 43 in which a through hole through which the second screw portion 32 can pass is formed. In the second threaded female thread member arranging step, the second threaded female thread member 39 that is threadedly engaged with the second threaded portion 32 is threadedly engaged with the second threaded portion 32 from the side opposite to the base portion 33 with respect to the penetration fixed member 43. It is.

  After the start of this process, the process proceeds to the first fixed member arranging step of step a1, and the first screw member 31 is inserted into the through hole of the first fixed member 42, thereby positioning the first fixed member 42. . Next, the process proceeds to the first screwing member arrangement step of step a2, and the first screwed member 38 is screwed into the first screw part 31, thereby fixing the first fixed member 42. Next, the process proceeds to the first fixed member processing step of step a3, and the first fixed member 42 is processed. Next, the process proceeds to the second fixed member arranging step of step a4, and the penetration fixing member 43 is positioned by inserting the second screw portion 32 into the through hole of the penetration fixing member 43. Next, the process proceeds to the second screwing female screw member arranging step of step a5, and the second screwing female screw member 39 is screwed into the second screw part 32, thereby fixing the penetration fixed member 43. Thereafter, this process ends.

  The first fixed member processing step is a step of soldering at least one of an electronic component and an electrical component to the substrate 42 in the first embodiment. The first fixed member processing step is a step of processing the first fixed member 42 in a state where the first fixed member 42 is fixed by the fixing member and the penetration fixed member 43 is not yet fixed. For example, in another embodiment, the first fixed member processing step may be a step including at least one of inspection and surface treatment of the first fixed member 42.

  According to the first embodiment, the component fixing method includes a first fixed member arranging step and a first screwing member arranging step. Thus, the first fixed member 42 can be positioned and the first fixed member 42 can be fixed. The component fixing method includes a second fixed member arranging step and a second threaded female screw member arranging step. Thereby, the penetration fixed member 43 can be positioned and the penetration fixed member 43 can be fixed. Since the step of fixing the first fixed member 42 and the step of fixing the penetration fixed member 43 are performed as different steps, the first fixed member 42 can be fixed without fixing the penetration fixed member 43. it can. The first fixed member fixed after the first fixed member 42 is fixed by the first fixed member arranging step and the first screwing member arranging step and before the second fixed member arranging step. 42 can be processed.

Second Embodiment
FIG. 5 is a cross-sectional view of a component fixing member according to a second embodiment of the present invention. FIG. 6 is a perspective view of a component fixing member according to the second embodiment of the present invention. FIG. 6A is a perspective view of a heat sink that is the base 33 according to the second embodiment, and FIG. 6B is a perspective view of a state in which the substrate that is the first fixed member 42 is fixed to the heat sink 33. FIG. 6C is a perspective view of a state in which the substrate 42 and the cover body that is the second fixed member 44 are fixed to the heat sink 33. In FIG. 6, the circuit on the substrate 42 and circuit components mounted on the circuit are omitted.

  In the second embodiment, the second screw portion 32 is formed with a female screw 45 having a valley diameter smaller than the valley diameter D2 of the first screw portion 31. The second screw portion 32 has the same axis L1 as the first screw portion 31. A surface perpendicular to the axial direction X is formed on the end portion 36 of the other X2 in the axial direction of the first screw portion 31 and the end portion 62 of the other X2 in the axial direction of the second screw portion 32. In the second embodiment, since the screw formed in the second screw portion 32 is the female screw 45, the second screwing member 40 screwed into the second screw portion 32 is also referred to as a “second screwing male screw member”. . In the second embodiment, the second fixed member 44 is disposed between the second screwing male screw member 40 and the base portion 33, and the second screwing female screw member 40 is screwed into the second screw portion 32. It is fixed by this, and is also referred to as “mounted mounting member”.

  Compared to the outer diameter D1 of the portion defining the surface perpendicular to the axial direction X, which is formed at the end 62 of the other axial direction X2 of the first screw portion 31 and the second screw portion 32, the riding fixed member 44 The inner diameter of the through hole formed in is set to be small. The mounted fixed member 44 in which a through-hole through which the second threaded male screw member 40 that is threadedly engaged with the second threaded portion 32 is formed is formed by the second threaded male threaded member 40 that is threadedly engaged with the second threaded portion 32. The seating surface 76 and the base 33 are disposed and fixed. Specifically, the mounted member 44 is disposed and fixed between the seating surface 76 of the head 71 of the second screwed male screw member 40 screwed into the second screw portion 32 and the vertical surface. The The mounted fixed member 44 is fixed without contacting the first screwing member 38 and the first fixed member 42. The load acting on the first fixed member 42 is prevented from acting on the mounted fixed member 44. The load acting on the mounted fixed member 44 is prevented from acting on the first fixed member 42. Further, the loosening of the screwing of the first screwing member 38 and the first screw part 31 does not weaken the fixing force for fixing the mounted member 44. When the screwing of the second screwing member and the second screw part 32 is loosened, the fixing force for fixing the first fixed member 42 is not weakened. The mounted fixed member 44 is fixed on the same side as the first fixed member 42 with respect to the base 33 after the first fixed member 42 is disposed and fixed between the first screwing member 38 and the base 33. The

  In the second embodiment, a male screw is formed in the first screw portion 31 as in the first embodiment. The member screwed into the first screw part 31 is the same first screwing member 38 as in the first embodiment. In the second embodiment, a female screw 45 is formed in the second screw portion 32, and a member screwed into the second screw portion 32 is a second screwing male screw member 40. Also in the second embodiment, the electric device is configured as an electronic control unit (ECU) mounted on a vehicle such as an automobile, for example, and includes a heat sink that is the base 33, a substrate that is the first fixed member 42, and a substrate. A component that is mounted on 42 and connected to a circuit, and a cover body that is the mounted member 44 are configured. Of these, the substrate 42 is the same as that in the first embodiment.

  The heat sink 33 is generally formed as a flat plate-like member, and is formed in a substantially rectangular shape when the heat sink 33 is viewed in the thickness direction. In the heat sink 33, a first screw portion 31 and a second screw portion 32 are formed in each portion near the four corners of the rectangle. The four first screw portions 31 and the four second screw portions 32 are formed with the thickness direction of the heat sink 33 as the axial direction X of the first screw portion 31 and the second screw portion 32. Therefore, the axial direction X coincides with the thickness direction of the heat sink 33. For each straight line perpendicular to the axis L1, the direction away from the axis L1 is called “radially outward” of the axis L1, and the direction approaching the axis L1 is “radially inward” of the axis L1. Called.

  The heat sink 33 includes a plate-like portion having the axial direction X as a thickness direction and a raised portion 66. Four raised portions 66 are formed to protrude in the other axial direction X2 from the plate-like portion of the heat sink 33. Four first screw portions 31 are formed on one cover body 44 so as to protrude in the other axial direction X <b> 2 of each raised portion 66. Therefore, the raised portion 66 is formed between each first screw portion 31 and the plate-like portion of the heat sink 33.

  The raised portion 66 is formed corresponding to the first screw portion 31. The raised portion 66 is formed as a cylinder having the same axis as the axis L <b> 1 of the first screw portion 31. The outer diameter of the cylinder of the raised portion 66 is set larger than the outer diameter D1 of the male screw of the first screw portion 31. The raised portion 66 is formed to be wide outward in the radial direction of the axis L1 from the end portion 35 of the first screw portion 31 in the axial direction X1. A flat surface facing the other axial direction X2 is formed at the end of the other axial direction X2 of the raised portion 66. A plane of the raised portion 66 facing the other axial direction X2 is perpendicular to the axial direction X. The plate-like portion of the heat sink 33, the first screw portion 31, the second screw portion 32, and the raised portion 66 are formed as an integral member.

  A through-hole penetrating in the axial direction X is formed around the axial line L1 as a center line inward in the radial direction of the axial line L1 of each first screw portion 31. The inner peripheral surface of the through hole formed in the first screw portion 31 of the heat sink 33 is the second screw portion 32, and the second screw portion 32 has the same straight line as the male screw of the first screw portion 31 along the axis L1. A female screw 45 is formed.

  A flat surface 47 facing the substrate 42 is formed on the cover body 44, and the flat surface 47 facing the substrate 42 is formed facing one axial direction X1. An outer surface 48 of the cover body 44 is formed on the other axial direction X2 of the flat surface 47 facing the substrate 42 as in the first embodiment. The cover body 44 is formed in a substantially rectangular shape when viewed in the axial direction X. The rectangular size of the cover body 44 viewed from the axial direction X is substantially the same as the rectangular size of the substrate 42 and the heat sink 33 viewed from the same direction. A peripheral wall 52 is formed so as to protrude from the portion that forms each side of the rectangle around the cover body 44 in one axial direction X1.

  The peripheral wall 52 is formed with four flat portions 53 similar to those of the first embodiment. The flat plate-like portion 53 in the vicinity of the four corners of the rectangle of the cover body 44 is connected to the cover body corner portion 54 formed in a flat plate shape with the axial direction X as the thickness direction. The cover body corner portion 54 is a part of the portion of the cover body 44 that is located at the most axial direction X1. The cover body corner portion 54 is formed at the same position in the axial direction X as the portion of the peripheral wall 52 that is located in the most axial direction X1. Four cover body corners 54 are formed on one cover body 44 corresponding to the four corners of the rectangle. Each cover body corner 54 is formed with one through hole penetrating in the axial direction X.

  The four through holes formed in the four cover body corners 54 correspond to the second threaded male screw member 40. The inner diameters of the four through holes formed in the cover body corner portion 54 are set to be larger than the outer diameters of the male screws formed in the second threaded male screw member 40, and the inner diameters of the through holes of the cover body corner portion 54 The difference between the external diameter of the male screw of the two screw male screw member 40 is set to 0.1 mm or more and 20 mm or less. The second threaded male screw member 40 can penetrate the through hole of the cover body corner portion 54.

  The larger the difference between the inner diameter of the through hole formed in the cover body corner portion 54 and the outer diameter of the second threaded male screw member 40, the larger the difference between the second threaded male screw member 40 and the cover body corner portion 54. In this case, the change in the position of the cover body corner portion 54 with respect to the heat sink 33 increases, and the positioning accuracy of the cover body 44 with respect to the heat sink 33 decreases. The smaller the difference between the inner diameter of the through hole formed in the cover body 44 and the outer diameter of the second threaded male screw member 40, the smaller the difference between the second threaded male screw member 40 and the cover body 44. The friction between the part 44 defining the through-hole formed in the cover body corner portion 54 of the body 44 and the second threaded male screw member 40 is increased, and the second threaded male screw member 40 is allowed to penetrate the cover body 44. It becomes difficult. By setting the difference between the inner diameter of the through hole of the cover body corner portion 54 and the outer diameter of the male screw of the second threaded male screw member 40 within the above range, the second threaded male screw is inserted into the through hole of the cover body corner portion 54. The member 40 can be easily penetrated, and the positioning accuracy of the cover body 43 with respect to the heat sink 33 can be increased.

  The second threaded male thread member 40 is within a range that can be threadedly engaged with the female thread 45 of the second threaded part 32, and the outer diameter of the male thread of the second threaded male threaded member 40 is that of the female thread 45 of the second threaded part 32. The diameter of the valley of the male screw of the second threaded male screw member 40 is set substantially equal to the inner diameter D5 of the female screw 45 of the second screw portion 32.

  A flat surface 56 perpendicular to the axial direction X and facing the other axial direction X2 is formed on the other axial direction X2 of the plate-like portion of the heat sink 33. From each corner portion of the plate-like portion of the heat sink 33, a protruding portion 66 and a first screw portion 31 are formed protruding in the other axial direction X2. One end X1 of the first screw portion 31 in the axial direction X1 is connected to the other axial plane X2 of the raised portion 66. The internal space formed inward in the radial direction of the axis L1 of the second screw portion 32 is open to the external space of the other X2 in the axial direction of the first screw portion 31 and the external space of the X1 in the axial direction of the heat sink 33. ing.

  Of the heat sink 33, the portion where the first screw portion 31 and the second screw portion 32 are formed is generally formed in a cylindrical shape, and the outer peripheral surface of the cylindrical portion is the first screw portion 31, and is a male screw. This is the part where is formed. The inner peripheral surface of the cylindrical portion is the second screw portion 32 and is a portion where the female screw 45 is formed. The diameter D2 of the valley of the male thread of the first screw part 31 is set larger than the diameter D4 of the valley of the female thread 45 of the second thread part 32. The end 36 of the other axial direction X2 of the first screw portion 31 and the end 62 of the other axial direction X2 of the second screw portion 32 are formed at the same position in the axial direction X, and the end portions of the other axial direction X2 In 36 and 62, a plane perpendicular to the axial direction X and facing the other axial direction X2 is formed. The male screw formed on the first screw part 31 and the female screw 45 formed on the second screw part 32 are formed as metric threads of a right-hand thread.

  The first screwing member 38 is a nut, and the second screwing male screw member 40 is a screw part. The second threaded male screw member 40 includes a screw base 69 on which a male screw is formed, and a head 71 connected to the screw base 69. The head 71 is formed in a circular shape when viewed in the axial direction X of the screw base 69. The axis of the screw base 69 coincides with the center line of the head 71 when viewed in the axial direction X of the screw base 69. When viewed in the axial direction X of the screw base 69, the outer diameter of the head 71 is set larger than the outer diameter of the screw base 69. One end of both ends of the screw base 69 is connected to the head 71, and the end connected to the head 71 is referred to as a “base end”. Of the both ends of the screw base 69 in the axial direction X, the other end far from the head 71 is referred to as a “tip”.

  A portion of the head 71 connected to the base end portion 72 of the screw base 69 is formed as a plane perpendicular to the axis of the screw base 69, and this plane is referred to as a “seat surface”. In order to rotate the second threaded male screw member 40 by inserting the tip of the driver into the portion of the head 71 farthest from the seat surface 76 in the direction from the tip 73 to the base 72 of the screw base 69. The provided slit 77 is formed. The outer diameter of the head 71 when the second threaded male screw member 40 is viewed in the axial direction X of the screw base 69 is set larger than the inner diameter of the through hole formed in the cover body corner portion 54.

  When the first screw member 38 is screwed into the first screw portion 31, the first fixed member 42 is fixed between the first screw member 38 and the base portion 33. Specifically, the first fixed member 42 is fixed between the first screwing member 38 and the raised portion 66. In a state where the first fixed member 42 is fixed between the first screwing member 38 and the raised portion 66, the length of the first screw portion 31 in the axial direction X is equal to the thickness of the first fixed member 42. It is longer than the total length of the first screw members 38 in the axial direction X.

  When the second screwed male screw member 40 is screwed into the second screw part 32, the mounted fixed member 44 is fixed between the second screwed male screw member 40 and the first screw part 31. In a state where the mounted member 44 is fixed between the second screwed male screw member 40 and the first screw part 31, the axis of the male screw formed on the second screwed male screw member 40 is the first screw part. 31 and the axis L1 of the second screw portion 32. In this state, the length in the axial direction X of the screw base 69 of the second threaded male screw member 40 is longer than the thickness of the mounted fixed member 44, and the thickness of the mounted fixed member 44 and the second screw portion 32. Or less than the total length of the axial direction X. When fixing the first fixed member 42, the first screw portion 31 is inserted into a through hole formed in the first fixed member 42. As a result, the first fixed member 42 is positioned with respect to the heat sink 33. In this state, the first screw member 38 is screwed into the first screw portion 31 from the other axial direction X2 of the first fixed member 42. By performing this operation with the four first screw portions 31, the first fixed member 42 is sandwiched and fixed between the raised portion 66 and the first screwing member 38. The first screwing member 38 is screwed into the first screw portion 31 by being rotated by a spanner or a monkey spanner.

  The surface perpendicular to the axial direction X of the cover body corner portion 54 is larger than the size of the head 71 of the screw component that is the second threaded male screw member 40 when viewed in the axial direction X. When fixing the cover body 44, which is the mounted member 44, the center line of the through hole formed in the cover body corner portion 54 is aligned with the axis L1 of the second screw portion 32 so that the cover body corner portion 54 is The first screw portion 31 and the second screw portion 32 are positioned on the other axial direction X2. In this state, the screw base 69 of the second threaded male screw member 40 is spaced radially inward from the other axial direction X2 of the cover body 44 to the through hole of the cover body corner 54 and the axis L1 of the second screw 32. And the second threaded male screw member 40 is threadedly engaged with the second threaded portion 32. By performing this operation with the four second screw portions 32, the cover body 44 is sandwiched between the first screw portion 31 and the second screw portion 32 and the head 71 of the second threaded male screw member 40. The first screw portion 31 is fixed to the other X2 in the axial direction. The second screwed male screw member 40 is screwed into the second screw portion 32 by being rotated by a driver.

  In a state where the first fixed member 42 is fixed to the heat sink 33, the surface of the substrate 42, which is the first fixed member 42, of the one axial direction X <b> 1 faces the other axial direction X <b> 2 of the heat sink 33. 56. As a result, heat generated when at least one of the electronic component and the electrical component mounted on the substrate 42 generates heat is transmitted from the substrate 42 to the heat sink 33 and diffused. This heat diffusion prevents a local temperature rise of the heat-generating component.

  In a state where both the first fixed member 42 and the mounted fixed member 44 are fixed to the heat sink 33, the surface facing the substrate 42 formed on the cover body 44 is the substrate 42 and the electronic mounted on the substrate 42. Without touching the component and the component, it is arranged on the other side X2 in the axial direction from the substrate 42. The cover body corner portion 54 is in contact with the end portion 36 of the other X2 in the axial direction of the first screw portion 31. The cover body corner 54 is disposed away from the first screwing member 38. The cover body 44 and the substrate 42 are disposed apart from each other. The space between the cover body 44 and the substrate 42 is continuous with the space outside the cover body 44 and the heat sink 33, and the heat of the air located in the space between the cover body 44 and the substrate 42 is It diffuses into the external space through the gap with 42.

  According to the second embodiment, the second screw portion 32 has the female screw 45 having the same axis L1 as the first screw portion 31 and having a valley diameter smaller than the valley diameter D2 of the first screw portion 31. It is formed. In addition, a surface perpendicular to the axial direction X is formed at the end portion 36 of the other X2 in the axial direction of the first screw portion 31 and an end portion 62 of the other X2 in the axial direction of the second screw portion 32. As a result, the mounting fixed member 44 in which the through-hole through which the second threaded male screw member 40 threadedly engaged with the second threaded portion 32 is formed is threadedly engaged with the second threaded portion 32. The male screw member 40 can be disposed and fixed between the seat surface 76 and the base portion 33. In the second embodiment, the end portion 36 of the other axial direction X2 of the first screw portion 31 and the end portion 62 of the other axial direction X2 of the second screw portion 32 are formed at the same position in the axial direction X. However, one of them may be positioned so as to protrude in the other X2 of the axial direction X2. In this case, of the end portion 36 of the first screw portion 31 in the other axial direction X2 and the end portion 62 of the second screw portion 32 in the other axial direction X2, the end portion located at the other axial direction X2. In addition, a plane perpendicular to the axial direction X is formed.

  Further, the first fixed member 42 and the mounted fixed member 44 can be fixed with a screw structure of the same axis. As a result, the fixing member is fixed as compared with the case where the fixing member for fixing the first fixed member 42 to the base 33 and the fixing member for fixing the mounted fixed member 44 to the base 33 are provided separately. The space occupied can be reduced. Therefore, the size of the electrical device in which a plurality of electrical components are fixed by the component mounting structure 30 can be further reduced. In addition, the first fixed member 42 and the mounted fixed member 44 are separately provided by the first screw member 38 and the second screw member 40, respectively, while fixing the plurality of members to the same axis as described above. Fixed to. Therefore, the process for the first fixed member 42 can be performed at a stage prior to fixing the mounted fixed member 44 in a state where the first fixed member 42 is securely fixed.

  When the inner diameter of the through hole formed in the mounted member 44 is smaller than the outer diameter of the portion defining the surface perpendicular to the axial direction X, the second threaded male screw that is threaded into the second threaded portion 32 It is possible to place and fix the mounted member 44 between the seating surface 76 of the head 71 of the member 40 and the vertical surface. The length of the first screw portion 31 in the axial direction X is longer than the total length of the thickness of the first fixed member 42 and the length of the first screwing member 38 in the axial direction X. Thus, when the mounted fixed member 44 is fixed between the second threaded female screw member 39 and the base 33, the mounted fixed member 44 is separated from the first screwed member 38 and the first fixed member 42. The mounted fixed member 44 can be arranged and fixed in the state.

  Therefore, the load acting on the first fixed member 42 is prevented from acting on the mounted fixed member 44, and the load acting on the mounted fixed member 44 is prevented from acting on the first fixed member 42. can do. Further, since the screwing of the first screwing member 38 and the first screw part 31 is loosened, the fixing force for fixing the mounted member 44 is not weakened. Further, since the screwing of the second screw member and the second screw portion 32 is loosened, the fixing force for fixing the first fixed member 42 is not weakened. After the first fixed member 42 is disposed and fixed between the first screwing member 38 and the base portion 33, the mounted fixed member 44 is fixed on the same side as the first fixed member 42 with respect to the base portion 33. Can do.

  According to the second embodiment, when the first fixed member 42 and the mounted fixed member 44 are fixed, the space occupied by the component mounting structure 30 can be reduced as much as possible. Further, since the first fixed member 42 can be fixed before the mounting fixed member 44 is fixed, the positioning of the first fixed member 42 is performed until the mounting fixed member 44 is fixed. It is possible to omit a jig for performing the above. The first fixed member 42 can be reliably fixed separately from the mounting fixed member 44.

  A raised portion 66 is formed between the first screw portion 31 and the plate-like portion of the heat sink 33. Thus, the substrate 42 is arranged away from the plate-like portion of the heat sink 33. Therefore, the outside air of the cover body 44 can pass through the gap between the cover body 44 and the substrate 42. Therefore, the heat from the component that generates heat mounted on the substrate 42 can be diffused to the outside air.

  FIG. 7 is a flowchart showing the steps of the component fixing method according to the second embodiment of the present invention. The component fixing method according to the second embodiment is, for example, a method of fixing a plurality of components of an electric device with a fixing member. Specifically, the fixing method is a method of fixing the first fixed member 42 and the mounted fixed member 44 by a fixing member. In the second embodiment, the fixing member is the heat sink 33, the first fixed member 42 is the substrate 42, and the mounted fixed member 44 is the cover body.

  The fixing method according to the second embodiment includes a first screw portion 31 on which a male screw is formed, a first screw portion 31 having the same axis L1 as the first screw portion 31, and a valley that is smaller than the valley diameter D2 of the first screw portion 31. A second screw portion 32 in which a female screw 45 having a diameter is formed and one end X1 35 of the first screw portion 31 in the axial direction are connected to each other and are more radial than the first screw portion 31 around the axis L1. This is a fixing method using the component mounting structure 30 including the base 33 extending outward. The fixing method includes a first fixed member arranging step, a first screwing member arranging step, a mounted fixed member arranging step, and a screw component screwing step.

  The first fixed member arranging step is a step of inserting the first screw portion 31 into the through hole of the first fixed member 42 in which a through hole through which the first screw portion 31 can pass is formed. The first screwing member arranging step is a step of screwing the first screwing member 38 screwed into the first screw part 31 into the first screw part 31 from the side opposite to the base 33 with respect to the first fixed member 42. is there. In the mounted fixed member arranging step, the mounted fixed member 44 in which a through-hole through which the second threaded male screw member 40 that is screwed into the second screw portion 32 is formed is formed on the mounted fixed member 44. In this step, the center line of the through hole and the axis L1 of the female screw 45 formed in the second screw portion 32 are substantially aligned. In the screw component screwing step, the second screwing male screw member 40 is passed through the through hole of the mounted member 44 and the second screwing male screw member 40 and the second screw portion 32 are screwed together. It is.

  After the start of this process, the process proceeds to the first fixed member arranging step of step b1, and the first fixed member 42 is positioned by inserting the first screw portion 31 into the through hole of the first fixed member 42. . Next, the process proceeds to a first screwing member arrangement step of step b2, and the first fixed member 42 is fixed by screwing the first screwing member 38 to the first screw part 31. Next, the process proceeds to the first fixed member processing step of step b3, and the first fixed member 42 is processed. Next, the process proceeds to the mounting fixed member arranging step of step b4, and the center line of the through hole of the mounting fixed member 44 and the axis L1 of the female screw 45 formed in the second screw portion 32 are substantially matched. The mounted member 44 is disposed in the other axial direction X2 with respect to the second screw portion 32. Next, the process proceeds to the screw component screwing step of step b5, and the screw component which is the second screwed male screw member 40 is inserted into the through hole of the mounted member 44, and the screw basics of the second screwed male screw member 40 are inserted. Is screwed into the second screw portion 32. As a result, the mounted fixed member 44 is formed between the seat surface 76 of the head 71 of the second threaded male screw member 40 and the ends 36 and 62 of the other X2 in the axial direction of the first screw portion 31 and the second screw portion 32. It is pinched and fixed between them. Thereafter, this process ends.

  The first fixed member processing step is a step of soldering at least one of an electronic component and an electrical component to the substrate 42 in the first embodiment. The first fixed member processing step is a step of processing the first fixed member 42 in a state where the first fixed member 42 is fixed by the fixing member and the mounted fixed member 44 is not yet fixed. . For example, in another embodiment, the first fixed member processing step may be a step including at least one of inspection and surface treatment of the first fixed member 42. Since the mounted fixed member is the second fixed member, the mounted fixed member arranging step may be referred to as a “second fixed member arranging step”.

  According to the second embodiment, the component fixing method includes a first fixed member arranging step and a first screwing member arranging step. Thus, the first fixed member 42 can be fixed. In addition, the component fixing method includes a mounting member fixing step and a screw component screwing step. Thereby, the second fixed member can be fixed. Since the step of fixing the first fixed member 42 and the step of fixing the mounted fixed member 44 are included as different steps, the first fixed member 42 is fixed without fixing the mounted fixed member 44. can do. Therefore, after the first fixed member arranging step and the first screwing member arranging step, processing is performed on the fixed first fixed member 42 at a stage before the riding fixed member arranging step. Is possible.

<Third Embodiment>
FIG. 8 is a cross-sectional view of the component mounting structure 30 according to the third embodiment of the present invention. In the third embodiment, the electrical device includes a first plate member 81, a second plate member 82, and a third plate member 83. The first plate-like member 81 to the third plate-like member 83 are plate-like components included in, for example, an electric device. In 3rd Embodiment, the 1st plate-shaped member 81-the 3rd plate-shaped member 83 are materials which have a ductility and consist of a material used for rolled steel materials. The base 33 according to the third embodiment is a second plate-like member 82. The first plate-like member 81 to the third plate-like member 83 are overlapped and fixed in the thickness direction with their thickness directions facing each other. Also in the third embodiment, since the screw formed in the second screw portion 32 is the female screw 45, the second screwing member 40 screwed into the second screw portion 32 is also referred to as a “second screwing male screw member”. . Also in the third embodiment, the second fixed member 83 is disposed between the second screwing male screw member 40 and the base portion 33, and the second screwing female screw member 40 is screwed into the second screw portion 32. It is fixed by this, and is also referred to as “mounted mounting member”.

  The first screw portion 31 and the second screw portion 32 are formed on the second plate-like member 82. The first screw portion 31 is formed with a male screw, and the second screw portion 32 is formed with a female screw 45. The first screw portion 31 and the second screw portion 32 are formed with the same straight line as the axis L1. When the second plate member 82 is viewed in the axial direction X, a portion of the second plate member 82 around the first screw portion 31 is formed as a plate-like portion having the axial direction X in the thickness direction. The axial direction X coincides with the thickness direction of each of the first plate member 81 to the third plate member 83. The first screw portion 31 is provided so as to protrude from the plate-like portion of the second plate-like member 82 in the other axial direction X2. A plate-like portion around the first screw portion 31 when the second plate-like member 82 is viewed in the axial direction X is the base portion 33. The base 33 of the second plate-like member 82 is formed as a plate-like member whose axial direction X is the thickness direction.

  The first screw part 31 and the second screw part 32 formed on the second plate-like member 82 may be either one or plural. In the third embodiment, one first screw portion 31 and one second screw portion 32 are provided for each second plate member 82.

  The portion of the second plate-like member 82 that is provided so as to protrude from the plate-like portion in the other axial direction X2 is generally cylindrical having a center line in the axial direction X. A radially outer surface portion of the center line of the cylinder is a first screw portion 31, and a radially inner surface portion of the center line of the cylinder is a second screw portion 32. The diameter D2 of the valley of the male thread of the first screw part 31 is set larger than the diameter D4 of the valley of the female thread 45 of the second thread part 32. The first screwing member 38 screwed into the first screw part 31 is a nut. The second threaded male thread member 40 that is threadedly engaged with the second threaded portion 32 is a threaded part.

  A through hole is formed in the first plate member 81 corresponding to the first screw portion 31. The inner diameter of the through hole of the first plate member 81 is set to be larger than the outer diameter D1 of the male screw of the first screw part 31, and the inner diameter of the through hole of the first plate member 81 and the male screw of the first screw part 31 are set. The difference from the outer diameter D1 is set to 0.1 mm or more and 20 mm or less. The inner diameter of the through hole of the first plate member 81 is set smaller than the outer diameter of the first screwing member 38. The first screw portion 31 can penetrate through the through hole of the first plate-like member 81.

  As the difference between the inner diameter of the through hole formed in the first plate-like member 81 and the outer diameter D1 of the male screw of the first screw portion 31 increases, the first screw portion 31 penetrates the first plate-like member 81. When this is done, the change in the position of the first plate member 81 relative to the second plate member 82 increases, and the positioning accuracy of the first plate member 81 relative to the second plate member 82 decreases. The smaller the difference between the inner diameter of the through hole formed in the first plate-like member 81 and the outer diameter D1 of the male screw of the first screw portion 31, the smaller the difference between the first screw portion 31 penetrates the first plate-like member 81. When this is done, the friction between the first screw portion 31 and the portion of the first plate member 81 that defines the through-hole formed in the first plate member 81 and the first screw portion 31 is increased. It becomes difficult to penetrate the shaped member. By making the difference between the inner diameter of the through hole formed in the first plate-like member 81 and the outer diameter D1 of the male screw of the first screw portion 31 within the above range, the penetration formed in the first plate-like member 81 The first screw part 31 can be easily passed through the hole, and the positioning accuracy of the first plate member 81 with respect to the second plate member 82 can be increased.

  The first plate member 81 is a first fixed member in the third embodiment. The 3rd plate-shaped member 83 is a mounting fixed member in 3rd Embodiment. A through hole is formed in the third plate-like member 83 corresponding to the second screwed male screw member 40. The inner diameter of the through hole of the third plate member 83 is set to be larger than the outer diameter of the male screw of the second screw male screw member 40, and the inner diameter of the through hole formed in the third plate member 83 and the second screw engagement. A difference between the male screw member 40 and the outer diameter of the male screw is set to 0.1 mm or more and 20 mm or less. The second threaded male screw member 40 can penetrate through the through hole of the third plate-like member 83. It is set smaller than the outer diameter of the head 71 of the second threaded male screw member 40.

  The larger the difference between the inner diameter of the through hole formed in the third plate-like member 83 and the outer diameter of the second screw-engaged male screw member 40, the larger the second screw-engaged male screw member 40 becomes to the third plate-like member 83. A change in the position of the third plate-like member 83 relative to the second plate-like member 82 when penetrating is increased, and the positioning accuracy of the third plate-like member 83 with respect to the second plate-like member 82 is lowered. The smaller the difference between the inner diameter of the through hole formed in the third plate-like member 83 and the outer diameter of the second screw-engaged male screw member 40, the smaller the second screw-engaged male screw member 40 becomes to the third plate-like member 83. When penetrating, the friction between the portion defining the through-hole in the third plate-like member and the second screwing male screw member 40 is increased, and the second screwing male screw member 40 is caused to penetrate the third plate-like member 83. It becomes difficult. By setting the difference between the inner diameter of the through hole formed in the third plate-like member 83 and the outer diameter of the second threaded male screw member 40 within the above range, the through-hole formed in the third plate-like member 83 It is possible to easily penetrate the second threaded male screw member 40 and to increase the positioning accuracy of the third plate member 83 with respect to the second plate member 82.

  The length of the first screw portion 31 in the axial direction X is set to be longer than the thickness of the first plate member 81 in the axial direction X. In the state where the first plate member 81 is fixed between the first screw member 38 and the base portion 33 by screwing the first screw member 38 to the first screw portion 31, The length in the axial direction X is set to be approximately equal to the total length of the thickness in the axial direction X of the first plate member 81 and the length in the axial direction X of the first screw member 38. The length of the first screw portion 31 in the axial direction X is longer than the total length of the thickness of the first plate member 81 in the axial direction X and the length of the first screw member 38 in the axial direction X. And you may make it the edge part of the other axial direction X2 of the 2nd thread part 32 protrude.

  The first plate member 81 is disposed on the other axial direction X2 with respect to the base portion 33 of the second plate member 82. The first plate-like member 81 is fixed by being sandwiched between the first screw member 38 and the base portion 33 arranged in the other axial direction X2 than the first plate-like member 81. The third plate-like member 83 is disposed on the one axial direction X1 with respect to the base 33 of the second plate-like member 82. The head 71 of the second threaded male screw member 40 is disposed further in the other axial direction X2 than the third plate-like member 83. The third plate-like member 83 is fixed by being sandwiched between the seat surface 76 of the head 71 of the second threaded male screw member 40 and the base portion 33.

  The length of the second screw part 32 in the axial direction X is set equal to the total length of the length of the first screw part 31 in the axial direction X and the thickness of the second plate-like member 82. The length of the screw base 69 of the second threaded male screw member 40 is set to be longer than the thickness of the third plate member 83 in the axial direction X, and the thickness of the third plate member 83 and the axis of the second screw portion 32 are set. The total length of the direction X is set to be equal to or less than the total length. The first screw part 31 and the second screw part 32 provided on the second plate-like member 82 are formed by punching. A punch and a die for forming the first screw portion 31 and the second screw portion 32 are assigned to predetermined positions of the second plate-like member 82 from both sides in the thickness direction of the second plate-like member 82. A first screw part 31, a second screw part 32, and a through hole inward in the radial direction of the axis L <b> 1 of the second screw part 32 are formed.

  When fixing the first plate-like member 81 as the first fixed member to the second plate-like member 82, the first screw portion 31 is inserted into the through hole formed in the first plate-like member 81. In this state, the first screw member 38 is screwed into the first screw portion 31 from the other axial direction X2 of the first plate member 81. By this operation, the first plate-like member 81 is sandwiched and fixed between the base portion 33 and the first screwing member 38. The first screwing member 38 is screwed into the first screw portion 31 by being rotated by a spanner or a monkey spanner.

  When fixing the third plate-like member 83, the center line of the through hole formed in the third plate-like member 83 and the axis L1 of the second screw portion 32 are aligned, and the third plate-like member 83 is moved from the base 33. Is also positioned at one axial direction X1. In this state, the screw base 69 of the second threaded male screw member 40 is moved in the radial direction of the through hole of the third plate-like member 83 and the axis L1 of the second screw portion 32 from one axial direction X1 of the third plate-like member 83. The third plate member 83 is screwed into the second screw portion 32 by being inserted into the inner space. By this operation, the third plate-like member 83 is sandwiched between the base portion 33 and the head 71 of the second threaded male screw member 40 and fixed to one X1 of the base portion 33 in the axial direction. The second screwed male screw member 40 is screwed into the second screw portion 32 by being rotated by a driver.

  In a state where the first plate-like member 81 is fixed to the second plate-like member 82, the surface of the first plate-like member 81 in the one axial direction X1 faces the other of the base portions 33 in the axial direction X2. 56. In a state where the third plate-like member 83 is fixed to the second plate-like member 82, the other axial surface X2 of the third plate-like member 83 is a plane formed to face one axial direction X1 of the base 33. Contact 57.

  According to the third embodiment, the second screw portion 32 has the female screw 45 having the same axis L1 as the first screw portion 31 and having a valley diameter smaller than the valley diameter D2 of the first screw portion 31. The formed base 33 is a plate-like member whose axial direction X is the thickness direction. The internal space formed by the second screw portion 32 is open to the external space of the other X2 in the axial direction than the base portion 33. Thus, the second fixed member 83 in which the through hole having an inner diameter equal to or larger than the valley diameter D4 of the second screw portion 32 can be fixed to the opposite side of the first screw portion 31 with respect to the base portion 33. The first fixed member 81 and the mounted fixed member 83 can be fixed with a screw structure of the same axis. As a result, the fixing member is fixed as compared with the case where the fixing member for fixing the first fixed member 81 to the base 33 and the fixing member for fixing the mounted fixed member 83 to the base 33 are provided separately. The space occupied can be reduced. Therefore, the size of the electrical device in which a plurality of electrical components are fixed by the component mounting structure 30 can be further reduced. In addition, each of the first fixed member 81 and the second fixed member 83 can be fixed in an arbitrary order, and the fixed first fixed member 81 and the second fixed member 83 can be arbitrarily set. It becomes possible to remove in order.

  FIG. 9 is a flowchart showing steps of a component fixing method according to the third embodiment. The component fixing method according to the third embodiment is a method of fixing the first plate member 81, the second plate member 82, and the third plate member 83. The fixing method according to the third embodiment has a first screw portion 31 on which a male screw is formed, and the first screw portion 31 has the same axis L1 as that of the first screw portion 31 and has a valley smaller than the valley diameter D2 of the first screw portion 31. A second screw portion 32 in which a female screw 45 having a diameter is formed and one end X1 35 of the first screw portion 31 in the axial direction are connected to each other and are more radial than the first screw portion 31 around the axis L1. This is a fixing method using the component mounting structure 30 including the base 33 extending outward. The fixing method includes a first fixed member arranging step, a first screwing member arranging step, a mounted fixed member arranging step, and a screw component screwing step.

  The first fixed member arranging step is a step of inserting the first screw portion 31 into the through hole of the first fixed member 81 in which a through hole through which the first screw portion 31 can pass is formed. The first screwing member arranging step is a step of screwing the first screwing member 38 screwed into the first screw part 31 into the first screw part 31 from the side opposite to the base 33 with respect to the first fixed member 81. is there. In the mounting / fixing member arranging step, the mounting / fixing member 83 in which a through-hole through which a screw component screwed into the second screw portion 32 can pass is formed, and the center of the through-hole of the mounting / fixing member 83 is set. In this step, the line and the axis L1 of the female screw 45 formed in the second screw portion 32 are substantially aligned. The screw component screwing step is a step in which the screw component is passed through the through hole of the mounted member 83 and the screw component and the second screw portion 32 are screwed together.

  The first fixed member arranging step of step c1 to the first fixed member processing step of step c3 of the present processing are the first fixed member arranging step of step b1 to the first fixed member of step b3 in the second embodiment. This is the same as the processing step. Thereafter, the process proceeds to the mounting / fixing member arranging step of step c4, and the center line of the through hole of the mounting / fixing member 83 and the axis L1 of the female screw 45 formed in the second screw portion 32 are substantially matched. The mounted fixed member 83 is disposed in the one axial direction X1 relative to the base 33. Next, the process proceeds to the screw component arranging step of step c5. The screw component placement step in step c5 is the same as the screw component placement step in step b5 in the second embodiment. Next, the process proceeds to the boarding / fixing member processing step of step c6, and the boarding / fixing member 83 is processed. Thereafter, this process ends.

  In the third embodiment, the first fixed member arranging step of step c1 to the first fixed member processing step of step c3, the mounted fixed member arranging step of step c4 to the mounted fixed member processing step of step c6, and Can exchange the order of processing with each other. That is, as steps c1 to c3, the mounted fixed member arranging step, the screw component arranging step, and the mounted fixed member processing step are performed in this order, and then, as the steps c4 to c6, the first fixed member arranging step, the first fixed member arranging step, The 1 screw member arranging step and the first fixed member processing step can be performed in this order. Since the mounted fixed member is the second fixed member, the mounted fixed member arranging step may be referred to as a “second fixed member arranging step”.

  According to the third embodiment, the component fixing method includes the first fixed member arranging step and the first screwing member arranging step. Thus, the first fixed member 81 can be fixed. In addition, the component fixing method includes a mounting member fixing step and a screw component screwing step. As a result, the mounted member 83 can be fixed. Since the step of fixing the first fixed member 81 and the step of fixing the mounted fixed member 83 are included as different steps, the first fixed member 81 is fixed without fixing the mounted fixed member 83. can do. Therefore, after the first fixed member arranging step and the first screwing member arranging step, the fixed first fixed member 81 is processed at a stage before the riding fixed member arranging step. Is possible.

  Further, according to the third embodiment, the mounted fixed member 83 is disposed on the side opposite to the base 33 with respect to the second screw portion 32, so that the first fixed member arranging step to the first fixed member processing step, The order of the processes can be exchanged with each other from the mounting fixed member arranging step to the mounting fixed member processing step. Therefore, it is also possible to perform the process on the fixed first fixed member 81 at the stage before the mounting fixed member arranging step, or to fix at the stage before the first fixed member arranging step. It is also possible to perform a process on the mounted fixed member 83.

  In the first to third embodiments, the first screw portion 31 and the second screw portion 32 are provided on the fixing member of the equipment component, but other screws other than the first screw portion and the second screw portion are provided. A portion to be formed may be provided. For example, in another embodiment, a first screw portion and a second screw portion similar to those in the first embodiment are provided, and an outer diameter equal to or smaller than the outer diameter of the male screw of the second screw portion is provided in the other axial direction than the second screw portion. An external thread having a diameter may be further formed. In still another embodiment, the first screw portion and the second screw portion similar to those in the first embodiment are provided, and the second screw portion in the second embodiment having the axis line of the second screw portion as the center line. An internal thread similar to the internal thread formed in the above may be further formed.

  As a result, in addition to the first fixed member 81 and the second fixed member, other fixed members can be fixed to the base 33. When another screw is formed having the same axis L1 as the first screw portion 31 and the second screw portion 32, the other screw may be one type of other screw having the same outer diameter or inner diameter. There may be other types of screws. Thereby, in addition to the first fixed member 81 and the second fixed member, a plurality of other fixed members can be fixed to the base 33.

<Other variations>
In the first to third embodiments, the screw formed as the male screw or the female screw is a right-handed metric screw, but the screw standard is not defined. For example, in another embodiment, a screw formed on the first screw portion, the second screw portion, the first screwing member, the second screwing female screw member, and the second screwing male screw member is a left-hand screw, a double screw, or an inch. Any of a screw, a metric coarse screw, a square screw, a round screw, etc. may be sufficient. In addition, the plurality of standard screws may be formed in a single fixing member.

  In the first and second embodiments, four first screw portions 31 and two second screw portions 32 are formed on one heat sink 33, but the first screw portion and the first screw portion formed on one fixing member are the same. The number of two screw parts is not specified. Each of the first screw portion and the second screw portion may be one or plural, and may be three or more or five or more.

  In the second embodiment, in the state where the first fixed member 42 is fixed between the first screwing member 38 and the raised portion 66, the length in the axial direction X of the first screw portion 31 is the first target member 42. It is longer than the total length of the thickness of the fixing member 42 and the length of the first screwing member 38 in the axial direction X. On the other hand, in another embodiment, the axial length of the first screw portion may be the same as the total length of the thickness of the first fixed member and the axial length of the first screwing member. Good. As a result, the cover body 44 comes into contact with the first screwing member. In this case, the heat from the component that generates heat mounted on the substrate can be transferred to the cover body 44 through the first screwing member.

  In the first to third embodiments, when the first screwing member to the second screwing male screw member 38 to 40 are screwed to the first screw part 31 and the second screw part 32, a washer is not used. Washers are further arranged on the side closer to the base 33 than the first screwing member 38, the side closer to the base 33 than the second screwing female screw member 39, and the side closer to the base 33 than the second screwing male screw member 40. Also good. As a result, the possibility of loosening of each screw can be reduced.

  In the second and third embodiments, the second threaded male screw member 40 is a screw component having a circular head 71 when viewed in the axial direction X of the screw base 69. The male screw member may be a bolt. In this case, the head is formed in a regular hexagon when viewed in the axial direction of the screw base, and the second threaded male screw member is rotated by a spanner, a monkey spanner, or a hexagon wrench and is screwed into the second screw portion 32.

In the second and third embodiments, the internal space formed radially inward of the second screw portion 32 opens to the external space of the other X2 in the axial direction than the first screw portion 31 and the second screw portion 32. In addition, it opens to the external space in the axial direction one X1 from the base 33. That is, the second screw portion 32 is formed over the entire axial direction X in a portion that defines a through hole formed in the component attachment structure 30 and extending in the axial direction X. However, in another embodiment, the internal space formed by the second screw portion is formed by a communication hole having an inner diameter larger than the diameter of the valley of the second screw portion with the axis of the second screw portion as the center line. It may communicate with the external space on the other side in the axial direction.
In the above embodiment, the component mounting structure has been described as being applied to an electrical device. However, as long as a plurality of components are fixed, other components such as a simple mechanical device and a vehicle may be used. It can be suitably applied.
Moreover, in 2nd Embodiment, the base 33 demonstrated as what has the protruding part 66 in order to fix the 1st to-be-fixed member 42. FIG. In order to fix the same raised portion to the first fixed member 42 in the first embodiment, or to fix the first fixed member 81 or the second fixed member 83 in the third embodiment, the base 33 You may make it provide in.

It is a side view of the boss structure for fixing a board | substrate and a cover body to a heat sink in 1st prior art. It is a longitudinal cross-sectional view of the double volt | bolt which concerns on a 2nd prior art. It is sectional drawing of the attachment structure 30 for components which concerns on 1st Embodiment of this invention. It is a flowchart showing the process of the fixing method of the components which concern on 1st Embodiment of this invention. It is sectional drawing of the fixing member for components which concerns on 2nd Embodiment of this invention. It is a perspective view of the fixing member for components which concerns on 2nd Embodiment of this invention. It is a flowchart showing the process of the fixing method of the component which concerns on 2nd Embodiment of this invention. It is sectional drawing of the attachment structure 30 for components which concerns on 3rd Embodiment of this invention. It is a flowchart showing the process of the fixing method of the component which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 30 Component mounting structure 31 1st screw part 32 2nd screw part 33 Base 38 1st screwing member 39 2nd screwing female screw member 40 2nd screwing male screw member 41 Male screw 42 1st to-be-fixed member 43 Through-fixed Member 44 Mounted member 45 Female screw 81 First plate member 82 Second plate member 83 Third plate member X Axis direction X1 Axis direction one X2 Axis direction other L1 Axis line D1 Outer diameter of male screw of first screw part D2 Diameter of the male screw valley of the first screw portion D3 Outer diameter of the male screw of the second screw portion D4 Diameter of the female screw valley of the second screw portion D5 Inner diameter of the female screw of the second screw portion

Claims (5)

A first threaded portion formed with a male thread that penetrates the first fixed member;
A second threaded portion that is formed with a screw having the same axis as the first threaded portion for fixing the second fixed member;
A first screwing member screwed into the first screw part;
A second screwing member screwed into the second screw part;
A component mounting structure comprising: a base portion that is continuous with one end portion of the first screw portion in the axial direction and that extends radially outward from the first screw portion around the axis. The second screw portion is formed with a male screw that penetrates the second fixed member and has an outer diameter smaller than the outer diameter of the first screw portion,
2. The component mounting structure according to claim 1, wherein the second screw portion is connected to the other end portion in the axial direction of the first screw portion. The second screw portion is formed with a female screw having a valley diameter smaller than the valley diameter of the first screw portion,
The second screw member is a male screw member, penetrates the second fixed member from the other in the axial direction and is screwed to the second screw portion, and is connected to the other of the first screw portion in the axial direction. The component mounting structure according to claim 1, wherein the second fixed member is fixed. The second screw portion is formed with a female screw having a valley diameter smaller than the valley diameter of the first screw portion,
The second screw member is a male screw member, penetrates the second fixed member from one side in the axial direction and is screwed to the second screw portion, and the second screw member is inserted into the second axial portion of the base portion. The component mounting structure according to claim 1, wherein a fixed member is fixed.   An electric apparatus provided with the attachment structure for components in any one of Claims 1-4.

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