JP6419526B2 - Spring member - Google Patents

Description

  The present invention relates to a spring member interposed between two members.

  2. Description of the Related Art Conventionally, in the automotive field and the precision equipment industry field, the connection between constituent members has been required to follow vibration. As a member that is used for connection between constituent members and has a followability to vibration, a spring member that is interposed between the two members is known. The spring member is elastically deformed in response to vibration generated in one member, thereby suppressing vibration from being transmitted to the member such as the other member while maintaining the connection.

  As such a spring member, a spring member (metal body) having a substantially flat frame portion and a contact portion (projection body) that comes up from a part of the frame portion and comes into contact with a member to be contacted ) Is disclosed (see, for example, Patent Document 1). The spring member disclosed in Patent Literature 1 can absorb vibration by the contact portion and maintain the contact state between the two members.

JP-A-10-303340

  By the way, in order to improve followability, it is preferable to increase the contact area by increasing the number and size of the contact portions. However, when the contact area between the contact portion and the member to be contacted is increased, the occupation ratio of the frame portion supporting the contact portion is reduced, and the rigidity between the contact portion and the frame portion is different. If there is a difference in rigidity between the contact part and the frame part, when the contact part is deformed due to the load applied from the outside, stress due to the deformation is applied to the frame part, and the stress causes the spring member to sag. End up. For this reason, the technique which suppresses the rigidity difference of a contact part and a frame part was desired.

  This invention is made | formed in view of the above, Comprising: It aims at providing the spring member which can suppress the rigidity difference of a contact part and a frame part.

  In order to solve the above-described problems and achieve the object, a spring member according to the present invention is a spring member that connects two members, and is formed using a substantially band-shaped member, and one end is curved. A proximal end portion, and a distal end portion whose other end is curved in a reverse bending manner with respect to the one end, and the contact portion that contacts the contact object at the proximal end portion and the distal end portion, respectively, A flat holding portion for holding the base end portion, and the occupation ratio of the holding portion with respect to the entire spring member is ¼ or more and ½ or less when viewed from a direction orthogonal to the main surface of the holding portion. And the contact portion is formed with a through-hole penetrating in the thickness direction.

  In the spring member according to the present invention, in the above invention, when the area of the through hole when the contact portion is extended in a flat plate shape is S3 and the area of the contact portion is S4, the area ratio S3 / S4. Is characterized by satisfying 1/2 or less.

  The spring member according to the present invention is characterized in that, in the above invention, the through hole has a rhombus opening.

  Moreover, the spring member according to the present invention is characterized in that, in the above invention, the contact portion has a rectangular shape when viewed from a direction orthogonal to a main surface of the holding portion.

  In the above invention, the spring member according to the present invention includes a plurality of the contact portions, the holding portion includes a plurality of openings provided in a matrix shape, and the one or more openings are provided. Each base end portion of the contact portion is held.

  According to the present invention, there is an effect that a difference in rigidity between the contact portion and the frame portion can be suppressed.

FIG. 1 is a side view schematically showing a configuration of a spring member according to an embodiment of the present invention. FIG. 2 is a plan view showing the configuration of the main part of the spring member according to the embodiment of the present invention. FIG. 3 is a side view showing the configuration of the main part of the spring member according to the embodiment of the present invention. FIG. 4 is a partial cross-sectional view schematically showing a configuration of a main part of the spring member according to the embodiment of the present invention, and is a diagram for explaining a case where a load is applied from the outside. FIG. 5 is a graph showing a spring constant ratio and a thermal resistance ratio per unit area in the spring member according to the embodiment of the present invention and the spring member according to the comparative example. FIG. 6 is a graph showing the relationship between the spring height, the load, and the thermal resistance per unit area in the spring member according to the embodiment of the present invention and the spring member according to the comparative example. Drawing 7 is a figure explaining an example of the manufacturing method of the spring member concerning an embodiment of the invention.

  In the following description, a spring member will be described as a mode for carrying out the present invention (hereinafter referred to as “embodiment”). Moreover, this invention is not limited by this embodiment. Furthermore, the same code | symbol is attached | subjected to the same part in description of drawing. Furthermore, the drawings are schematic, and it should be noted that the relationship between the thickness and width of each member, the ratio of each member, and the like are different from the actual ones. Moreover, the part from which a mutual dimension and ratio differ also in between drawings.

  FIG. 1 is a side view schematically showing a configuration of a spring member according to an embodiment of the present invention. The spring member 1 concerning this Embodiment is arrange | positioned between the heat generating member and heat radiating member which oppose. The spring member 1 applies pressure to both the heat generating member and the heat radiating member by elastic force, and transmits heat generated by the heat generating member to the heat radiating member. The spring member 1 is formed using a flat member made of a material having elastic characteristics, for example, a copper-based alloy (for example, a Corson-based copper alloy).

  The spring member 1 extends in a strip shape in a direction rising from the inner peripheral surface of the opening 10a of the frame 10 to the frame 10 with a flat frame 10 having openings 10a provided in a matrix. The contact part 11 which exists and contacts a contact object is provided. The frame portion 10 functions as a holding portion that holds the plurality of contact portions 11. Here, in the present embodiment, the occupation ratio of the frame portion 10 with respect to the spring member 1 is ¼ or more and ½ or less in the projected shape seen from the direction orthogonal to the main surface of the frame portion 10. In addition, when the occupation rate of the frame part 10 is larger than 1/2, since the frame part occupies half or more of the spring member, it is considered that there is no difference in rigidity between the frame part 10 and the contact part 11. .

  FIG. 2 is a plan view showing the configuration of the main part of the spring member according to the present embodiment. FIG. 3 is a side view showing the configuration of the main part of the spring member according to the present embodiment, and is a view showing a state in which the spring member is placed on the heat radiating member. When the side where the contact part 11 extends with respect to the frame part 10 is located above the frame part 10, the contact part 11 has a base end part 11 a that has a curved surface convex downward with respect to the surface of the frame part 10, and a frame It has a curved surface that is convex upward with respect to the surface of the portion 10, and has a tip portion 11b that comes into contact with the contact target. The contact portion 11 has a rectangular projection shape viewed from above. The proximal end portion 11a and the distal end portion 11b are each curved with a predetermined radius of curvature. In addition, the curvature radius (r) of the base end part 11a and the front-end | tip part 11b in this Embodiment means the curvature radius in the site | part (for example, a convex top part and a concave bottom part) where a curvature radius becomes the smallest.

  Further, the contact portion 11 is formed with a through hole 11c penetrating in the plate thickness direction. In the through hole 11c, the shape of the opening (as viewed from the top surface of the spring member 1) viewed from a direction orthogonal to the main surface of the frame portion 10 is substantially rhombus. For example, the short axis (or long axis) of the rhombus includes a straight line that passes through the center of each of the base end portion 11 a and the tip end portion 11 b and is on a plane perpendicular to the main surface of the frame portion 10. When the area of the through hole 11c when the contact portion 11 is extended into a flat plate shape (for example, a first tongue piece portion 203 in FIG. 7 described later) is S3 and the area of the contact portion 11 is S4, the area ratio S3 / S4. Satisfies 1/2 or less (however, 0 is not included). When the occupation ratio of the frame portion 10 described above is the minimum (1/4), the rigidity difference between the frame portion 10 and the contact portion 11 can be adjusted by setting the area ratio S3 / S4 to 1/2. By forming the through hole 11c, the rigidity of the contact portion 11 can be reduced as compared with a contact portion having the same plate thickness where no through hole is formed. The size and shape of the through hole 11 c are determined in consideration of the rigidity of the frame portion 10 and the rigidity due to the shape of the contact portion 11. The contact portion 11 preferably has symmetry with respect to a straight line passing through the center of each of the base end portion 11a and the tip end portion 11b in the projected shape seen from the direction orthogonal to the main surface of the frame portion 10.

  As shown in FIG. 3, the spring member 1 has the frame portion 10 disposed on the heat radiating member 100, and the heat generating member 101 (see FIG. 4) disposed from the opposite side. At this time, both ends of the contact portion 11 are in contact with the heat radiating member 100 and the heat generating member 101, respectively. Specifically, the base end portion 11 a contacts the heat radiating member 100, and the tip end portion 11 b contacts the heat generating member 101.

  FIG. 4 is a partial cross-sectional view schematically showing a configuration of a main part of the spring member according to the embodiment of the present invention, and is a diagram for explaining a case where a load is applied from the outside. In addition, in FIG. 4, the shape of the contact part 11 in the state where the load is not applied to the front-end | tip part 11b is shown with the broken line Q. When the spring member 1 is disposed between the heat radiating member 100 and the heat generating member 101, the base end portion 11 a is in contact with the heat radiating member 100, and the distal end portion 11 b is in contact with the heat generating member 101. As the distance between the heat dissipating member 100 and the heat generating member 101 is reduced, a load is applied to the spring member 1. When a load starts to be applied to the spring member 1, the contact portion 11 gradually lies down with respect to the frame portion 10. On the other hand, the frame portion 10 maintains flatness regardless of the load.

  Subsequently, in the spring member having the same plate thickness, the spring constant when the through hole is formed in the contact portion 11 and the case where the through hole is not formed, and the thermal resistance per unit area (contact thermal resistance) Will be described.

  The thermal resistance per unit area is determined by the sum of the thermal resistance of the conductor and the contact thermal resistance. The thermal resistance of the conductor is the same because the material used is the same in this comparison.

ここで、ｈ_ｃ：接触熱伝達率（Ｗ／ｍ^２Ｋ）であり、下式（２）に基づいて求めることができる。

ここで、Ｐ：接触面圧（ＭＰａ）、λ：材料の熱伝導率（Ｗ／ｍＫ）、Ｈｖ：材料のビッカース硬度、Ｒａ：接触面の中心線平均粗さ（μｍ）、ｃ_１，ｃ_２，ｃ_３：定数。
式（２）において、右辺の第１項は高温側部材（例えば発熱部材）に関する項であり、第２項は低温側部材（例えばばね部材）に関する項である。 As for the contact thermal resistance, the contact thermal resistance R _c (m ² K / W) when the contact area is constant can be obtained by the following equations (1) and (2) (The Japan Society of Mechanical Engineers Proceedings (A Vol. 76, No. 763 (2010-3), paper No. 09-0569 (p.344-350)).
The thermal contact resistance R _c is can be determined based on the following equation (1).

Here, h _c : contact heat transfer coefficient (W / m ² K), which can be obtained based on the following equation (2).

Here, P: contact surface pressure (MPa), λ: thermal conductivity of material (W / mK), Hv: Vickers hardness of material, Ra: center line average roughness (μm) of contact surface, c ₁ , c ₂ , c ₃ : Constant.
In Expression (2), the first term on the right side is a term related to the high temperature side member (for example, a heat generating member), and the second term is a term related to the low temperature side member (for example, a spring member).

ここで、Ａ_ｃ：接触面積、Ａ_ｓｐ：接触面と直交する方向からみたばね部材の投影面積。 By obtaining the contact thermal resistance R _c obtained from the equations (1) and (2), the contact thermal resistance R _cu per unit area can be obtained based on the following equation (3).

Here, A _c : contact area, A _sp : projected area of the spring member viewed from the direction orthogonal to the contact surface.

  FIG. 5 is a graph showing a spring constant ratio and a thermal resistance ratio per unit area in the spring member according to the embodiment of the present invention and the spring member according to Comparative Example 1. In the graph shown in FIG. 5, the spring member when the through hole 11 c is formed in the contact portion 11 is an example, the case where the through hole is not formed is Comparative Example 1, and the value of Comparative Example 1 is 1. The ratios of the examples are shown. The characteristics of one contact portion when the same load is applied to the contact portion are compared. As shown in FIG. 5, the spring constant when the through hole 11c is formed is smaller than that when the through hole 11c is not formed. The spring constant k is given by k = P / δ (P is load (N), δ is displacement (mm)). When the same load is applied, the spring constant is smaller in the contact portion 11 in which the through-hole 11c is formed and the rigidity is lower than that in the first comparative example.

On the other hand, when the through hole 11c is formed, the contact thermal resistance is larger than when the through hole 11c is not formed. The contact thermal resistance R _cu per unit area becomes larger when the difference between the rigidity of the frame portion 10 and the through hole 11c is formed to reduce the rigidity of the contact portion 11. From this, when the difference between the rigidity of the frame part 10 and the rigidity of the contact part 11 by forming the through hole 11c is reduced, the sag of the spring member 1 is reduced by reducing the stress applied to the frame part 10. Therefore, it can be considered that the contact thermal resistance per unit area increases.

  Thus, even when the spring member is formed using a material having the same plate thickness, the spring constant and the thermal resistance per unit area differ depending on whether or not the through hole 11c is formed. For example, by using a material having a plate thickness of 0.10 mm and forming a through hole 11c that is equivalent to the spring constant and thermal resistance per unit area of a spring member that does not have the through hole 11c, the plate thickness is reduced to 0. It can be made using a 13 mm material. In this case, since the thickness of the frame portion 10 is 0.13 mm, the through hole 11 c is formed while increasing the rigidity of the frame portion 10, so that the characteristics equivalent to the characteristics of the contact portion having a thickness of 0.10 mm can be obtained. It can be set as the contact part which has.

  FIG. 6 is a graph showing the relationship between the spring height (load) and thermal resistance per unit area in the spring member according to the embodiment of the present invention (Example) and the spring member according to Comparative Example 2. The example shown in FIG. 6 is a spring member 1 made of a material having a plate thickness of 0.13 mm, and Comparative Example 2 is made of a material having a plate thickness of 0.10 mm and has a through hole. It is a spring member that does not. In addition, the spring constant of the spring member (contact part) concerning an Example and the comparative example 2 is the same. The spring height here refers to the height D from the bottom of the frame portion 10 to the top of the contact portion 11 in the spring member 1 shown in FIG. 3, and the more the load is applied, the smaller the spring height is. Become.

  As shown in FIG. 6, when the spring member 1 according to the example is viewed at the same spring height, compared to the spring member of Comparative Example 2, the load relative to the spring height (load per contact portion ( N)) is large. This has shown that the spring member 1 concerning an Example has a small plastic distortion compared with the spring member of the comparative example 2. FIG. In other words, it can be said that the spring member 1 according to the example has reduced initial settling compared to the spring member of the comparative example 2 for the same spring height. This is considered to be because the difference in rigidity between the frame portion 10 and the contact portion 11 is reduced by the formation of the through hole 11c. Thus, the spring member 1 according to the embodiment improves the elastic characteristics and the thermal characteristics as compared with a spring member having a thin plate thickness and no through-hole 11c even if the spring constant is the same. be able to.

  In addition, regarding the thermal resistance per unit area, the spring member 1 according to the example has a reduced initial settling due to the formation of the through hole 11c, and therefore, compared with the spring member of Comparative Example 2 when viewed at the same spring height. And thermal resistance is small.

  Next, an example of the manufacturing method of the spring member concerning this Embodiment is demonstrated with reference to drawings. FIG. 7 is a diagram for explaining an example of a method for manufacturing a spring member according to the present embodiment. For example, a plurality of slits 201 are formed in a band-shaped base material 200 made of a Corson copper alloy. The slit 201 forms a hollow space having a substantially M shape in plan view. The slit 201 forms a frame portion 202, and a first tongue piece portion 203 and a second tongue piece portion 204 that extend from the frame portion 202 in a rectangular shape.

  After the formation of the first tongue piece 203 and the second tongue piece 204, through holes 203a and 204a having rhombic openings are formed. After the formation of the through holes 203a and 204a, with respect to the first tongue piece portion 203 and the second tongue piece portion 204, an end portion on the side continuous with the frame portion, and an end portion on a different side from the side continuous with the frame portion 202, Are curved to have a predetermined radius of curvature, thereby forming the contact portion 11 described above.

  Thus, the spring which has the frame part 10 and the contact part 11 mentioned above by forming the slit 201 and curving the 1st tongue piece part 203 and the 2nd tongue piece part 204 which were produced | generated by formation of the slit 201. FIG. The member 1 can be produced.

  According to the above-described embodiment, since the through hole 11c penetrating in the plate thickness direction is formed in the contact portion 11 of the spring member 1, the rigidity difference between the frame portion 10 and the contact portion 11 is suppressed. Can do. As a result, when the spring member 1 is formed using a material having a uniform plate thickness, only the rigidity of the frame portion 10 is increased by changing the plate thickness, and the characteristics of the contact portion 11 before the plate thickness is changed are changed. It can be maintained.

  Further, according to the above-described embodiment, the contact portion 11 is a tongue piece extending in a rectangular shape, and is formed using a tongue piece having a through hole having a rhombus-shaped opening. Heat transfer efficiency compared to the case where a contact portion is formed by curving a tongue-shaped portion having a tapered shape, for example, a weight, or when a through hole having an opening having another shape such as a circle is formed. Is expensive. In general, when the contact portion is formed by bending the tongue piece portion, the tongue piece portion formed into a tapered shape is bent, but the tongue piece portion having a rectangular shape as in the present embodiment is used. By forming the contact portion based on the above, more efficient heat transfer can be performed.

  Conventionally used heat transfer spring members include heat transfer grease and heat transfer sheet. However, if the thickness of the heat transfer grease or heat transfer sheet is reduced from the viewpoint of conductor thermal resistance, the followability to vibration is reduced. On the other hand, in heat transfer grease, when the thickness of the spring member is increased from the viewpoint of followability with respect to vibration, it is difficult to control the thermal resistance because it is difficult to adjust the thickness. Further, in the heat dissipation sheet, when the thickness of the spring member is increased from the viewpoint of followability to vibration, it is necessary to contain a large amount of high thermal conductive filler to reduce the conductor thermal resistance, and the high thermal conductive filler becomes harder. Therefore, the followability to vibration cannot be improved. On the other hand, the spring member concerning this Embodiment can make high thermal conductivity and high vibration followability compatible by having the structure mentioned above.

  In the above-described embodiment, each contact portion 11 may have the same shape, or may have a different size or curved form. It is preferable to design appropriately depending on how the load is applied. Note that the same shape means the same shape in design and includes manufacturing errors.

  In the above-described embodiment, the plurality of contact portions 11 are described. However, the frame portion has a rectangular flat plate shape and has a rectangular opening, and one contact extending from a part of the opening of the frame portion. It is good also as a spring member which has a part (contact part 11). Also in this case, the size and shape of the through hole are determined according to the rigidity of the frame portion.

  In the embodiment described above, the contact portion 11 is described as being formed with the through hole 11c having a rhombus-shaped opening. May be. In addition to the heat transfer described above, the shape of the through hole can be appropriately changed depending on the application, such as a spring member provided between the two members and supporting the two members. In particular, for heat transfer, a through-hole having a diamond-shaped opening is preferable from the viewpoint of thermal characteristics, and considering the elastic characteristics of the contact portion, a through-hole having a circular opening is preferable from the viewpoint of elastic characteristics.

  As described above, the spring member according to the present invention is suitable for obtaining a spring member that suppresses a difference in rigidity between the contact portion and the frame portion.

1 Spring member 10, 202 Frame part (holding part)
DESCRIPTION OF SYMBOLS 11 Contact part 11a Base end part 11b Tip part 11c, 203a, 204a Through-hole 201 Slit 203 1st tongue piece part 204 2nd tongue piece part

Claims (4)

A spring member connecting two members,
A base end portion formed using a substantially band-shaped member, and having a base end portion curved at one end and a tip end portion curved at an opposite end with respect to the one end, the base end portion and A contact portion that makes contact with the contact object at the tip,
A plate-like holding part for holding the base end part;
With
When viewed from the direction orthogonal to the main surface of the holding portion, the occupation ratio of the holding portion with respect to the entire spring member is ¼ or more and ½ or less,
The contact member is formed with a through hole penetrating in a thickness direction and having an opening having a rhombus shape.   The area ratio S3 / S4 satisfies 1/2 or less, where S3 is an area of the through hole when the contact portion is extended in a flat plate shape, and S4 is an area of the contact portion. The spring member according to 1. The contact portion, the spring member according to claim 1 or 2, characterized in that the rectangular when viewed from a direction perpendicular to the main surface of the holding portion. A plurality of the contact portions,
The holding part has a plurality of openings provided in a matrix,
The spring member according to any one of claims 1 to 3 , wherein the opening holds each base end of one or more contact portions.

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