Fixation structure

Abstract

To reduce the number of components and the number of fixation manhours for fixing an object component to a mating member.SOLUTION: A fixation structure is a structure for pressing and fixing a core 2 onto a heat sink 1 by a pressing member 3. The heat sink 1 includes engaged parts 11 with which engaging parts 32 can engage. The pressing member 3 includes: the engaging parts 32; elastic deformation parts 32a that are elastically deformed through the engagement of the engaging parts 32 with the engaged parts 11 to exhibit deformation reaction force; and first pressing parts 33 that come into contact with the core 2 to press the core 2 in a direction different from a direction toward the heat sink 1. The pressing member 3 is configured to press the core 2 on the heat sink 1 by being pressed against the core 2 through the deformation reaction force. The first pressing parts 33 are disposed so that the at least two first pressing parts 33 face to each other while sandwiching the core 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a fixing structure in which a target component is fixed by being pressed against a mating component by a pressing member. [Background technology]

[0002] A conventional technique of this type is known, for example, from Patent Document 1. This technique relates to the manufacture of electrical equipment, and fixes a heat sink (target component) to a substrate and a holding member (mating member) by fastening bolts (screw members) with leaf springs interposed therebetween. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-219605 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology described in Patent Document 1, the target part was fixed to the mating member by fastening a screw member, which required the steps of procuring the screw member, drilling a tapped hole in the mating member, and fastening the screw member.In addition, a leaf spring was used to fasten the screw member, which required a strength design that took into account the stress around the fastening part of the leaf spring.

[0005] This disclosed technology has been made in consideration of the above circumstances, and its purpose is to provide a fixing structure that makes it possible to reduce the number of parts and the number of fixing steps required to fix a target part to a mating member. [Means for solving the problem]

[0006] In order to achieve the above object, the technology described in claim 1 is a fixing structure in which a target part is fixed by a pressing member to a mating part, the mating part including an engaged part with which an engaging part can be engaged, the pressing member including an engaging part, an elastic deformation part that elastically deforms when the engaging part engages with the engaged part and exerts a deformation reaction force, and a first pressing part that comes into contact with the target part and presses the target part in a direction different from the direction toward the mating part, the pressing member is configured to be pressed against the target part by the deformation reaction force, thereby pressing the target part against the mating part, and the first pressing parts are at least two first pressing parts arranged facing each other with the target part in between.

[0007] According to the configuration of the above technology, the engaging portion of the pressing member engages with the engaged portion of the mating member, elastically deforming the elastically deforming portion to exert a deformation reaction force. The pressing member is pressed against the target component by this deformation reaction force, and the target component is pressed and fixed to the mating member. Therefore, screw members, threaded hole processing, and fastening using the screw members are not required. In addition, at least two first pressing portions are arranged facing each other across the target component, and press the target component in opposing directions, different from the direction toward the mating component.

[0008] In order to achieve the above object, the technology described in claim 2 is the technology described in claim 1, wherein the pressing member contacts the target part and further includes a second pressing portion that presses the target part in a direction different from the direction toward the opposing part and intersects with the pressing direction of the first pressing portion, and the second pressing portions are arranged so that at least two second pressing portions face each other with the target part sandwiched therebetween.

[0009] According to the configuration of the above technology, in addition to the effect of the technology described in claim 1, at least two second pressing portions are arranged facing each other with the target part in between, and press the target part in opposing directions that are different from the direction toward the opposing member and that intersect with the pressing direction of the first pressing portion.

[0010] In order to achieve the above object, the technology described in claim 3 is the technology described in claim 1, wherein the first pressing portion includes a contact portion where the first pressing portion comes into contact with the target part, and the contact portion is formed from a curved surface.

[0011] According to the configuration of the above technology, in addition to the effect of the technology described in claim 1, the contact portion of the first pressing portion that comes into contact with the target component is formed from a curved surface, so the contact area between the first pressing portion and the target component is increased.

[0012] In order to achieve the above object, the technology described in claim 4 is the technology described in claim 2, wherein the second pressing portion includes a contact portion where the second pressing portion comes into contact with the target part, and the contact portion is formed from a curved surface.

[0013] According to the configuration of the above technology, in addition to the effect of the technology described in claim 2, the contact portion of the second pressing portion that comes into contact with the target component is formed from a curved surface, thereby increasing the contact area between the second pressing portion and the target component.

[0014] In order to achieve the above object, the technology described in claim 5 is the technology described in any one of claims 1 to 4, wherein the pressing member further includes a main body portion that comes into surface contact with the target component to press the target component against the mating component.

[0015] According to the configuration of the above technology, in addition to the effect of the technology described in any one of claims 1 to 4, the main body of the pressing member comes into surface contact with the target component to press the target component against the mating member, thereby increasing the contact area between the pressing member and the target component. [Effects of the Invention]

[0016] According to the technology described in claim 1, it is possible to reduce the number of parts and the man-hours required to fix the target part to the mating member. Also, the pressing member can be positioned relative to the target part in the direction in which the first pressing part presses, preventing the target part from shifting in position in the same direction.

[0017] According to the technology described in claim 2, in addition to the effect of the technology described in claim 1, the pressing member can be positioned relative to the target component in the direction in which the second pressing portion presses, thereby preventing the target component from shifting in position in the same direction.

[0018] According to the technology recited in claim 3, in addition to the effect of the technology recited in claim 1, it is possible to distribute the stress load on the target component caused by the first pressing portion.

[0019] According to the technique recited in claim 4, in addition to the effect of the technique recited in claim 2, it is possible to distribute the stress load on the target component caused by the second pressing portion.

[0020] According to the technology described in claim 5, in addition to the effect of the technology described in any one of claims 1 to 4, it is possible to increase the fixing force of the pressing member to fix the target component to the mating component. Also, if the target component is a heat-generating component, it is possible to improve the heat dissipation effect from the pressing member. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 10 is a perspective view showing a state in which the core is fixed to the heat sink in the embodiment. [Figure 2] FIG. 10 is a front view showing a state in which the core is fixed to the heat sink in the embodiment. [Figure 3] FIG. 10 is a perspective view showing the results of applying a required load to a first pressing portion and analyzing the amount of change in the load using CAE in one embodiment. [Figure 4] FIG. 10 is a perspective view showing the results of applying a required load to the second pressing portion and analyzing the amount of change in the load by CAE in the embodiment. [Figure 5] FIG. 10 is a perspective view showing the results of applying a required load to an engagement portion and analyzing the amount of change in the engagement portion using CAE, according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, a detailed description will be given of an embodiment of the fixing structure of the disclosed technique with reference to the drawings. In this embodiment, a case where a core is fixed to a heat sink in the manufacture of an electric device will be described.

[0023] [About the fixed structure] FIG. 1 is a perspective view showing the state in which core 2 is fixed to heat sink 1 according to this embodiment. FIG. 2 is a front view showing the state in which core 2 is fixed to heat sink 1 according to this embodiment. As shown in FIGS. 1 and 2, in this embodiment, core 2 is pressed and fixed to heat sink 1 by pressing member 3. Core 2 corresponds to an example of a "target component" in this disclosed technology. Heat sink 1 corresponds to an example of a "mating member" in this disclosed technology.

[0024] In this embodiment, the core 2 is made of metal and has a roughly rectangular parallelepiped shape. The entire upper side of the core 2 forms a flat plate portion 21, and three legs 22, 23, and 24 are provided at intervals on the lower side of the plate portion 21. Of each of the legs 22 to 24, two are located at both ends of the plate portion 21 in the longitudinal direction (X direction in FIG. 1), and the other is located at the center of the plate portion 21. The legs 22 to 24 have the same height. The lower end of each of the legs 22 to 24 forms a flat surface that is in surface contact with the flat upper surface of the heat sink 1 and is grounded.

[0025] In this embodiment, the heat sink 1 is made of metal. Two engaged portions 11 are provided on the upper surface of the heat sink 1, with which engaging portions 32, which will be described later, can engage. Each engaged portion 11 rises from the upper surface of the heat sink 1 and is formed from a plate material bent into an L-shaped cross section. The two engaged portions 11 are arranged at both ends of the core 2 in the longitudinal direction (X direction in FIG. 1), with a gap between them. Each engaged portion 11 is arranged with its tip pointing toward the respective end face of the core 2.

[0026] In this embodiment, the pressing member 3 is formed from a single elastically deformable plate material. The pressing member 3 includes a main body portion 31, two engaging portions 32, two elastically deforming portions 32a, two first pressing portions 33, and two second pressing portions 34 (only one of which is shown in FIGS. 1 and 2). The pressing member 3 fixes the core 2 to the heat sink 1 by engaging the leaf spring-type engaging portions 32 (snap fit) with the engaged portions 11 provided on the heat sink 1.

[0027] The main body portion 31 is plate-shaped and comes into surface contact with the entire upper surface of the core 2 to press the core 2 against the heat sink 1. Each engaging portion 32 is provided corresponding to each engaged portion 11. Each engaging portion 32 is formed by utilizing the expansion portions at both ends of the main body portion 31 in the longitudinal direction (X direction in FIG. 1 ). Each engaging portion 32 includes an elastic deformation portion 32a at its tip end. Each elastic deformation portion 32a elastically deforms by engaging with the engaged portion 11, thereby exerting a deformation reaction force. The pressing member 3 is pressed against the core 2 by this deformation reaction force. The core 2 is pressed against the heat sink 1 by this pressing.

[0028] In this embodiment, the engagement portion 32 and the first pressing portion 33 are integrally formed. The first pressing portion 33 contacts the core 2 and presses the core 2 in a direction (X direction in FIG. 1) different from the direction toward the heat sink 1 (Y direction in FIG. 1). That is, the main body 31 presses the core 2 vertically toward the heat sink 1 (Y direction in FIG. 1), while the first pressing portion 33 presses the core 2 horizontally against the heat sink 1 (X direction in FIG. 1). The two first pressing portions 33 are arranged facing each other with the core 2 sandwiched between them in the longitudinal direction. The two first pressing portions 33 press the core 2 in opposing directions.

[0029] 1 and 2, the first pressing portion 33 includes a first contact portion 33a that comes into contact with the core 2. The first contact portion 33a is formed of a curved surface that is bent at an acute angle.

[0030] In this embodiment, the second pressing portion 34 is formed integrally with the main body portion 31. The second pressing portion 34 contacts the core 2 and presses it in a direction (Z direction in FIG. 1) that is different from the direction toward the heat sink 1 (Y direction in FIG. 1) and intersects with the pressing direction of the first pressing portion 33 (X direction in FIG. 1). That is, the first pressing portion 33 and the core 2 are disposed in opposing positions sandwiching the core 2 in its longitudinal direction (X direction in FIG. 1). In contrast, the second pressing portions 34 are disposed in opposing positions sandwiching the core 2 in its lateral direction (Z direction in FIG. 1). The two second pressing portions 34 press the core 2 in opposing directions.

[0031] 1 and 2, the second pressing portion 34 includes a second contact portion 34a that comes into contact with the core 2. The second contact portion 34a is formed from a curved surface that is bent at an acute angle. [About the production of clamping members]

[0032] As shown in FIGS. 1 and 2, the main body portion 31, the engaging portion 32, the elastic deformation portion 32a, the first pressing portion 33 and the second pressing portion 34 that constitute the pressing member 3 are formed from the same plate material.

[0033] The first pressing portion 33 is formed into a substantially triangular cross section by bending downward at a right angle the inside of two notches 31a made in the expanded portions at both ends of the longitudinal direction of the main body portion 31, and then bending it inward twice more. The first pressing portion 33 contacts the outer surfaces of the leg portions 22, 24 at both ends of the core 2. The first pressing portion 33 exerts a deformation stress due to its cross-sectional shape.

[0034] The engaging portion 32 is formed by bending a rectangular plate material extending outward from the center of the first pressing portion 33 into a curled shape. The bent tip of the engaging portion 32 serves as an elastically deforming portion 32a.

[0035] The second pressing portions 34 are formed by bending rectangular plate material extending outward from the centers of both longitudinal sides of the main body 31 downward at a right angle and then bending it inward twice more to form a generally triangular cross section. The second pressing portions 34 contact the front and rear end surfaces of the central leg portion 23 of the core 2. The second pressing portions 34 exert deformation stress due to this cross-sectional shape.

[0036] [Analysis results of change in clamping member] Here, the necessary loads are applied to the first pressing portion 33, the second pressing portion 34, and the engaging portion 32 (elastically deforming portion 32a), and the amount of change in these portions is analyzed by CAE. The results are shown in the perspective views of Figures 3 to 5. In Figures 3 to 5, the hatched portions indicate fixed restraint portions 41, and the meshed portions indicate Y-direction restraint portions 42 in the Y direction. In this embodiment, the thickness of the plate material constituting the pressing member 3 is 0.25 mm.

[0037] Fig. 3 shows the analysis results for the first pressing portion 33. The required load for the first pressing portion 33 is 9.6 N, and the required deformation amount is 0.326 mm. As shown in Fig. 3, the largest deformation load in the first pressing portion 33 is the first contact portion 33a, where the load direction indicated by the arrow is the X direction.

[0038] Figure 4 shows the analysis results for the second pressing portion 34. The required load for the second pressing portion 34 is 9.6 N, and the required deformation amount is 0.911 mm. As shown in Figure 4, the largest deformation load in the second pressing portion 34 is the second contact portion 34a, where the load direction indicated by the arrow is the X direction.

[0039] Figure 5 shows the analysis results for the engaging portion 32 (elastically deforming portion 32a). The required load for the engaging portion 32 is 14.4 N, and the required deformation amount is 0.326 mm. As shown in Figure 5, the largest deformation load in the engaging portion 32 is the curved portion where the elastically deforming portion 32a contacts the engaged portion 11, and the load direction indicated by the arrow is the Y direction.

[0040] [Core fixing procedure] To fix the core 2 to the heat sink 1 using the above-described fixing structure, first, the pressing member 3 is fitted to the core 2 so that the first pressing portion 33 and the second pressing portion 34 contact the core 2. That is, the two first pressing portions 33 are brought into contact with the opposing short sides of the core 2 with their deformation stress. At the same time, the two second pressing portions 34 are brought into contact with the opposing long sides of the core 2 with their deformation stress.

[0041] Second, the lower ends of the legs 22 to 24 of the core 2 are directed toward the upper surface of the heat sink 1, and the core 2 is aligned between the two engaged portions 11. Then, the core 2 is brought closer to the heat sink 1 together with the pressing member 3. At this time, the two engaging portions 32 (elastically deforming portions 32a) are deformed and elastically deformed toward the inside of the engaged portions 11, which have an L-shaped cross section, to engage with them.

[0042] When the engaging portion 32 is engaged with the engaged portion 11, the deformation reaction force of the elastically deforming portion 32a causes the main body portion 31 of the pressing member 3 to press the core 2 against the heat sink 1, fixing it in the Y direction. The pressing member 3 is positioned in the X direction relative to the core 2 by the two first pressing portions 33. The pressing member 3 is further positioned in the Z direction relative to the core 2 by the two second pressing portions 34.

[0043] [About the function and effect of the fixed structure] According to the fixing structure of this embodiment described above, the core 2 is fixed to the heat sink 1 by engaging the leaf spring-type engaging portion 32 (snap fit) provided on the pressing member 3 with the engaged portion 11 provided on the heat sink 1. Here, the engaging portion 32 of the pressing member 3 is engaged with the engaged portion 11 of the heat sink 1, elastically deforming the elastically deforming portion 32a and generating a deformation reaction force. The pressing member 3 is pressed against the core 2 by this deformation reaction force, and the core 2 is pressed and fixed to the heat sink 1. Therefore, screw members are not required, and tapped hole drilling and fastening using screw members are not required. This reduces the number of parts and the number of fixing steps required to fix the core 2 to the heat sink 1. In other words, the number of parts of the fixing structure can be reduced by the amount of screw members not provided. The assembly process (tap hole drilling and screw fastening) can be reduced by the amount of screw members not fastened.

[0044] According to the configuration of this embodiment, the two first pressing portions 33 are arranged facing each other with the core 2 in between, and press the core 2 in opposing directions that are different from the direction toward the heat sink 1. Therefore, the pressing member 3 can be positioned relative to the core 2 in the pressing direction of the first pressing portions 33, and displacement of the core 2 in the same direction can be prevented.

[0045] According to the configuration of this embodiment, the two second pressing portions 34 are arranged facing each other with the core 2 in between, and press the core 2 in opposing directions that are different from the direction toward the heat sink 1 and that intersect the pressing direction of the first pressing portion 33. Therefore, the pressing member 3 can be positioned relative to the core 2 in the pressing direction of the second pressing portion 34, and displacement of the core 2 in the same direction can be prevented.

[0046] In this embodiment, two leaf spring type engaging portions 32 provided on the pressing member 3 can press the core 2 in the Y direction (vertical direction) in FIG. 1 to fix it to the heat sink 1. Two leaf spring type first pressing portions 33 provided on the pressing member 3 can press the pressing member 3 in the X direction (left-right direction) in FIG. 1 to position the core 2. Furthermore, two leaf spring type second pressing portions 34 provided on the pressing member 3 can press the pressing member 3 in the Z direction (front-back direction) in FIG. 1 to position the core 2.

[0047] In this embodiment, compared to fastening with a screw member, the stress on the leaf spring-type engaging portion 32 is smaller, reducing the risk of breakage. This makes it easier to design the strength of the engaging portion 32 and the engaged portion 11. On the other hand, leaf springs may be used to fasten the screw member, but in this case, stress concentrates near the fastening portion of the screw member, making it necessary to design the structure with strength in mind. In contrast, in this embodiment, a fixed structure using the leaf spring-type engaging portion 32 is used, eliminating the need for fastening with a screw member, making it easier to design the strength of the engaging portion 32. Furthermore, the contact area between the leaf spring-type engaging portion 32 and the engaged portion 11, which is made of a plate material, is larger, improving the heat dissipation of the core 2.

[0048] In this embodiment, even if the mounting position of the engaging portion 32 is shifted due to the dimensional tolerance of the pressing member 3, the effect of the position shift is small because the elastically deforming portion 32a is used. Therefore, the allowable tolerance can be widened.

[0049] In this embodiment, as shown in Fig. 2, the contact position between the engaging portion 32 and the engaged portion 11 is higher, so the elastically deforming portion 32a stretches and the downward fixation of the main body portion 31 is strengthened. If the contact position between the engaging portion 32 and the engaged portion 11 is lower than that shown in Fig. 2, the error is absorbed by the elastically deforming portion 32a.

[0050] According to the configuration of this embodiment, the contact portions 33a, 34a of the first pressing portion 33 and the second pressing portion 34 that come into contact with the core 2 are formed from curved surfaces, which increases the contact area between each pressing portion 33, 34 and the core 2. This allows the stress load on the core 2 caused by each pressing portion 33, 34 to be dispersed.

[0051] According to the configuration of this embodiment, the main body 31 of the pressing member 3 comes into surface contact with the core 2 to press the core 2 against the heat sink 1. This increases the contact area between the pressing member 3 and the core 2. This increases the force with which the pressing member 3 fixes the core 2 to the heat sink 1. Furthermore, when the core 2 is a heat-generating component, the heat dissipation effect from the pressing member 3 can be improved.

[0052] In this embodiment, the pressing member 3 contacts the core 2 and the engaged portion 11 on multiple surfaces via the main body portion 31, the engaging portion 32, the first pressing portion 33, and the second pressing portion 34. In this sense, the contact area between the pressing member 3 and the core 2 is increased, and the heat dissipation effect from the core 2 is enhanced. For this reason, the fixing structure can also be used as one of the heat dissipation measures.

[0053] The disclosed technology is not limited to the above-described embodiment, and part of the configuration can be appropriately modified within the scope of the disclosed technology.

[0054] (1) In the above embodiment, the core 2 as the target component is fixed to the heat sink 1 as the mating member. However, the target component and the mating member are not limited to this.

[0055] (2) In the above embodiment, two first pressing members 33 are arranged facing each other with the core 2 in between, but three or more first pressing parts may be arranged facing each other with the target component in between.

[0056] (3) In the above embodiment, two second pressing members 34 are arranged facing each other with the core 2 in between, but three or more second pressing parts may be arranged facing each other with the target component in between.

[0057] (4) In the above embodiment, the elastically deforming portion 32a provided on the engaging portion 32 is bent in a curled shape, but it does not have to be curled, and may be in any shape that is elastically deformable. [Industrial Applicability]

[0058] The disclosed technique relates to the manufacture of electronic devices and the like and can be used to fix a target component to a mating component. [Explanation of symbols]

[0059] 1 Heat sink (mating component) 2 Core (target part) 3. Retaining member 11 Engaged part 32 Engagement part 32a Elastic deformation part 33 First pressing part 33a 1st contact part 34 Second pressing part 34a 2nd contact part

Claims

1. A fixing structure in which a target part is pressed against a mating part by a pressing member, the mating member includes an engaged portion with which the engaging portion can engage, the pressing member includes the engaging portion, an elastic deformation portion that elastically deforms when the engaging portion engages with the engaged portion to exert a deformation reaction force, and a first pressing portion that contacts the target component and presses the target component in a direction different from the direction toward the counter component, the pressing member is configured to be pressed against the target component by the deformation reaction force, thereby pressing the target component against the counter component, At least two of the first pressing units are arranged facing each other with the target component interposed therebetween. A fixing structure characterized by:

2. The fixing structure according to claim 1, the pressing member further includes a second pressing portion that contacts the target component and presses the target component in a direction different from the direction toward the counter component and intersects with the pressing direction of the first pressing portion, At least two of the second pressing units are arranged facing each other with the target component in between. A fixing structure characterized by:

3. The fixing structure according to claim 1, The first pressing portion includes a contact portion that contacts the target component, and the contact portion is formed from a curved surface. A fixing structure characterized by:

4. The fixing structure according to claim 2, The second pressing portion includes a contact portion that contacts the target component, and the contact portion is formed from a curved surface. A fixing structure characterized by:

5. The fixing structure according to any one of claims 1 to 4, The pressing member further includes a main body portion that comes into surface contact with the target component to press the target component against the mating member. A fixing structure characterized by:

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