JP7124724B2

JP7124724B2 - Connection structure of closed section members

Info

Publication number: JP7124724B2
Application number: JP2019007480A
Authority: JP
Inventors: 晃金子
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2019-01-21
Filing date: 2019-01-21
Publication date: 2022-08-24
Anticipated expiration: 2039-01-21
Also published as: JP2020118172A

Description

本発明は、線膨張率が異なる材料で構成された閉断面部材同士の接続構造に関する。 TECHNICAL FIELD The present invention relates to a structure for connecting closed cross-section members made of materials having different coefficients of linear expansion.

自動車は、燃費改善のために軽量化が求められている。このため、アルミニウム、マグネシウムなどの軽金属やカーボンファイバーで補強された樹脂、例えば、ＣＦＲＰ等で多くの部材が構成されており、軽金属製の部品とＣＦＲＰ製の部品とを接着剤で接続して一つの部材とする場合がある。 Automobiles are required to be lighter in order to improve fuel efficiency. For this reason, many members are made of light metals such as aluminum and magnesium and resins reinforced with carbon fiber, such as CFRP. may be one member.

接着剤として接着安定性に優れる一液性熱硬化型接着剤を用いる場合、アルミニウムとＣＦＲＰとが高温雰囲気中で接着されるため、線膨張率の違いにより硬化後の接着剤に熱応力が残ってしまい、接着力が低下する場合があった。このため、軽金属とＣＦＲＰとの接着面に軽金属の熱膨張率とＣＦＲＰの熱膨張率との中間の熱膨張率の鋼板のカラーを挟んで接着し、接着剤の熱応力を低減して接着力の低下を抑制する方法が提案されている（例えば、特許文献１参照）。 When using a one-part thermosetting adhesive with excellent adhesion stability as the adhesive, since aluminum and CFRP are bonded together in a high-temperature atmosphere, thermal stress remains in the adhesive after curing due to the difference in coefficient of linear expansion. There was a case where the adhesive strength was lowered. For this reason, a collar of a steel plate having a coefficient of thermal expansion between that of the light metal and that of CFRP is sandwiched between the bonding surface of the light metal and CFRP, and the thermal stress of the adhesive is reduced. There has been proposed a method for suppressing a decrease in the (see, for example, Patent Literature 1).

特開平１－９５９８７号公報JP-A-1-95987

ところで、自動車は、さまざまな環境条件で使用されるものである。寒冷地などで外気温度が低下した場合、特許文献１に記載されたようにアルミニウムパイプの外周にアルミニウムよりも線膨張率の小さいＣＦＲＰパイプを接着した構造では、内周側のアルミニウムパイプの外径が外周側のＣＦＲＰパイプの内径よりも大きく収縮してしまうため、アルミニウムパイプの外周面とＣＦＲＰパイプの内周面との間に隙間ができ、接着面が剥離してしまう場合がある。 By the way, automobiles are used under various environmental conditions. When the outside air temperature drops in a cold region, etc., in a structure in which a CFRP pipe having a linear expansion coefficient smaller than that of aluminum is adhered to the outer circumference of an aluminum pipe as described in Patent Document 1, the outer diameter of the inner circumference aluminum pipe shrinks more than the inner diameter of the CFRP pipe on the outer peripheral side, a gap is formed between the outer peripheral surface of the aluminum pipe and the inner peripheral surface of the CFRP pipe, and the adhesive surface may peel off.

そこで、本発明は、温度変化が大きい場合にも接着面が剥離しにくい閉断面部材の接続構造を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a connection structure for closed cross-section members in which the adhesive surface is less likely to peel off even when temperature changes are large.

本発明の閉断面部材の接続構造は、第１材料で構成された第１閉断面部材と、前記第１材料よりも線膨張率が小さい第２材料で構成された第２閉断面部材と、を接続する接続構造であって、前記第１閉断面部材の外周側に前記第２閉断面部材が嵌め込まれ、前記第１閉断面部材の内周側に閉断面形状の内側部材が前記第２閉断面部材と入れ子状に嵌め合わされ、前記第１閉断面部材の外周側と内周側の嵌め合わせ面のいずれか一方又は両方が前記第２閉断面部材又は前記内側部材と接着されており、前記内側部材は、前記第１材料よりも線膨張率が小さい第２材料で構成されていること、を特徴とする。

A connection structure for closed cross-section members of the present invention includes a first closed cross-section member made of a first material, a second closed cross-section member made of a second material having a coefficient of linear expansion smaller than that of the first material , wherein the second closed cross-section member is fitted on the outer peripheral side of the first closed cross-section member, and the inner member having a closed cross-section is provided on the inner peripheral side of the first closed cross-section member. 2. The first closed cross-section member is fitted with the closed cross-section member in a nested manner, and either one or both of the fitting surfaces on the outer peripheral side and the inner peripheral side of the first closed cross-section member are adhered to the second closed cross-section member or the inner member. , wherein the inner member is made of a second material having a coefficient of linear expansion smaller than that of the first material .

このように、線膨張率が大きい第１閉断面部材の外周側と内周側とに線膨張率が小さい第２閉断面部材と内側部材を嵌め合わせ、嵌め合わせ面を接着しているので、温度上昇により線膨張率が大きい第１閉断面部材が膨張した場合には外側の第２閉断面部材により第１閉断面部材の膨張を抑制し、温度低下により線膨張率が大きい第１閉断面部材が収縮した場合には内側の内側部材により第１閉断面部材の収縮を抑制するので、温度変化による接着面の剥離を抑制することができる。 In this way, the second closed cross-section member having a small linear expansion coefficient and the inner member are fitted to the outer peripheral side and the inner peripheral side of the first closed cross-section member having a large linear expansion coefficient, and the fitting surfaces are bonded. When the first closed cross-section member having a large coefficient of linear expansion expands due to temperature rise, the expansion of the first closed cross-section member is suppressed by the second closed cross-section member on the outside, and the first closed cross-section member having a large coefficient of linear expansion due to temperature decrease. When the member shrinks, the inner member suppresses the contraction of the first closed cross-section member, so that peeling of the adhesive surface due to temperature change can be suppressed.

本発明は、温度変化が大きい場合にも接着面が剥離しにくい閉断面部材の接続構造を提供することができる。 INDUSTRIAL APPLICABILITY The present invention can provide a connection structure for closed cross-section members in which the adhesive surface is less likely to peel off even when there is a large temperature change.

実施形態の接続構造を適用した車両用部品の斜視図である。1 is a perspective view of a vehicle component to which a connection structure of an embodiment is applied; FIG. 図１に示す車両用部品の分解斜視図である。FIG. 2 is an exploded perspective view of the vehicle component shown in FIG. 1; 図１のＡ－Ａ断面を示す断面図である。FIG. 2 is a sectional view showing the AA section of FIG. 1;

以下、図面を参照しながら実施形態の閉断面部材の接続構造１００について説明する。以下の実施形態では、接続構造１００を車両のステアリングコラムを支持するステアリングコラムサポート１０に適用した場合について説明する。なお、図１～３において、矢印ＦＲ、矢印ＵＰ、矢印ＲＨは、車両の前方向（進行方向）、上方向、右方向をそれぞれ示している。また、各矢印ＦＲ、ＵＰ、ＲＨの反対方向は、車両後方向、下方向、左方向を示す。以下、単に前後、左右、上下の方向を用いて説明する場合は、特に断りのない限り、車両前後方向の前後、車両左右方向（車両幅方向）の左右、車両上下方向の上下を示すものとする。他の図においても同様である。 A connection structure 100 for closed cross-section members according to an embodiment will be described below with reference to the drawings. In the following embodiments, a case where the connection structure 100 is applied to a steering column support 10 that supports a steering column of a vehicle will be described. 1 to 3, an arrow FR, an arrow UP, and an arrow RH indicate the forward direction (traveling direction), upward direction, and rightward direction of the vehicle, respectively. The opposite directions of the arrows FR, UP, and RH indicate the rearward direction, downward direction, and leftward direction of the vehicle. In the following description, when simply using front-rear, left-right, and up-down directions, front-rear in the vehicle front-rear direction, left and right in the vehicle left-right direction (vehicle width direction), and up and down in the vehicle vertical direction will be indicated, unless otherwise specified. do. The same applies to other drawings.

図１に示すように、ステアリングコラムサポート１０は、アルミニウム等の軽金属で構成され、ステアリングコラムが取り付けられる本体１１と、本体１１の車両幅方向両側に取り付けられて本体１１と車両側端の構造部材との間を接続する炭素繊維強化プラスチック（以下、ＣＦＲＰという）で構成された円筒形のパイプ２０と、本体１１と車両前方の構造部材とを接続するアーム１３とで構成されている。ここで、本体１１を構成する第１材料である軽金属の線膨張率は、パイプ２０を構成する第２材料であるＣＦＲＰの線膨張率よりも大きい、逆に言うと、パイプ２０を構成する第２材料であるＣＦＲＰの線膨張率は、本体１１を構成する第１材料である軽金属の線膨張率よりも小さい。 As shown in FIG. 1, the steering column support 10 is made of a light metal such as aluminum. and a cylindrical pipe 20 made of carbon fiber reinforced plastic (hereinafter referred to as CFRP), and an arm 13 connecting the main body 11 and a structural member in front of the vehicle. Here, the coefficient of linear expansion of the light metal that is the first material that constitutes the main body 11 is greater than the coefficient of linear expansion of CFRP that is the second material that constitutes the pipe 20 . The coefficient of linear expansion of CFRP, which is the second material, is smaller than the coefficient of linear expansion of the light metal, which is the first material forming the main body 11 .

本体１１の車両幅方向両側端には、外周面にパイプ２０が取り付けられる円筒形状のパイプ取付座１２が本体１１と一体に設けられている。また、パイプ取付座１２の内周側には、円筒形状の内側部材３０が取り付けられている。ここで、パイプ取付座１２は、第１閉断面部材を構成し、パイプ２０は第２閉断面部材を構成する。 Cylindrical pipe mounting seats 12 to which pipes 20 are mounted on the outer peripheral surface are provided integrally with the main body 11 at both vehicle width direction ends of the main body 11 . A cylindrical inner member 30 is attached to the inner peripheral side of the pipe attachment seat 12 . Here, the pipe mounting seat 12 constitutes a first closed cross-section member, and the pipe 20 constitutes a second closed cross-section member.

パイプ２０の内径寸法は、パイプ取付座１２の外径寸法よりも僅かに大きく、内側部材３０の外径寸法は、パイプ取付座１２の内径寸法よりも僅かに小さくなっている。そして、図２に示すように、パイプ取付座１２の内周側に内側部材３０が嵌めこまれ、パイプ取付座１２の外周側にパイプ２０の端部が嵌め込まれる。そして、パイプ取付座１２とパイプ２０の嵌め合わせ面１２ａ、及び、パイプ取付座１２と内側部材３０との嵌め合わせ面１２ｂには、接着剤４０（図３参照）が設定される。従って、外周側と内周側の嵌め合わせ面１２ａ，１２ｂはそれぞれ外周側、内周側の接着面となる。 The inner diameter of the pipe 20 is slightly larger than the outer diameter of the pipe mounting seat 12 , and the outer diameter of the inner member 30 is slightly smaller than the inner diameter of the pipe mounting seat 12 . Then, as shown in FIG. 2 , the inner member 30 is fitted on the inner peripheral side of the pipe mounting seat 12 , and the end of the pipe 20 is fitted on the outer peripheral side of the pipe mounting seat 12 . An adhesive 40 (see FIG. 3) is applied to the fitting surface 12a between the pipe mounting seat 12 and the pipe 20 and the fitting surface 12b between the pipe mounting seat 12 and the inner member 30. As shown in FIG. Therefore, the fitting surfaces 12a and 12b on the outer peripheral side and the inner peripheral side are the bonding surfaces on the outer peripheral side and the inner peripheral side, respectively.

このように、閉断面部材であるパイプ取付座１２とパイプ２０との接続構造１００では、軽金属製のパイプ取付座１２の外周側と内周側とにＣＦＲＰ製のパイプ２０と内側部材３０とが入れ子状に嵌め合わされ、パイプ取付座１２の外周側と内周側の嵌め合わせ面１２ａ，１２ｂの両方がそれぞれ接着剤４０でパイプ２０と内側部材３０と接着されている。 As described above, in the connection structure 100 between the pipe mounting seat 12 and the pipe 20, which are closed cross-section members, the CFRP pipe 20 and the inner member 30 are provided on the outer and inner peripheral sides of the light metal pipe mounting seat 12. Both the fitting surfaces 12a and 12b on the outer peripheral side and the inner peripheral side of the pipe mounting seat 12 are bonded to the pipe 20 and the inner member 30 with an adhesive 40, respectively.

以上説明したように構成された接続構造１００の環境温度が低下した場合には、図３に示すように、線膨張率の大きい軽金属製のパイプ取付座１２の外径寸法は、外周側に取り付けられた線膨張率の小さいＣＦＲＰ製のパイプ２０の内径寸法よりも小さい寸法に縮もうとする。しかし、パイプ取付座１２の内周側に取り付けられているＣＦＲＰ製の内側部材３０は線膨張率が小さく、外径寸法がパイプ取付座１２の内径寸法ほど縮まない。このため、図３に示すように、内側部材３０は、パイプ取付座１２が縮もうとする中心に向かう力Ｆ１に対向する外側に向う力Ｆ２でパイプ取付座１２を外周側に押し返し、パイプ取付座１２が縮むことを抑制する。これにより、パイプ取付座１２の外径寸法が縮んで接着面であるパイプ２０の内周面とパイプ取付座１２の外周面とが剥離することを抑制することができる。 When the environmental temperature of the connection structure 100 configured as described above drops, as shown in FIG. The inner diameter of the pipe 20 made of CFRP having a small coefficient of linear expansion is reduced to a size smaller than that of the pipe 20 . However, the CFRP inner member 30 attached to the inner peripheral side of the pipe mounting seat 12 has a small coefficient of linear expansion, and the outer diameter does not shrink as much as the inner diameter of the pipe mounting seat 12 . Therefore, as shown in FIG. 3, the inner member 30 pushes back the pipe mounting seat 12 to the outer peripheral side by an outward force F2 opposing the force F1 directed toward the center of the pipe mounting seat 12, which causes the pipe mounting seat 12 to shrink. It restrains the seat 12 from shrinking. As a result, it is possible to prevent the inner peripheral surface of the pipe 20 and the outer peripheral surface of the pipe mounting seat 12 from being separated from each other due to shrinkage of the outer diameter of the pipe mounting seat 12 .

また、反対に周囲温度が上昇した場合には、外周側のパイプ２０がパイプ取付座１２の半径方向の膨張を抑制するので、接着面であるパイプ取付座１２の内周面と内側部材３０の外周面とが剥離することを抑制することができる。 Conversely, when the ambient temperature rises, the pipe 20 on the outer peripheral side suppresses the radial expansion of the pipe mounting seat 12, so that the inner peripheral surface of the pipe mounting seat 12 and the inner member 30, which are bonding surfaces, Separation from the outer peripheral surface can be suppressed.

このように、接続構造１００は、温度変化が大きい場合にも接着面が剥離しにくいという効果を奏する。 Thus, the connection structure 100 has the effect that the adhesive surface is less likely to peel off even when the temperature changes significantly.

以上、円筒状のパイプ取付座１２にパイプ２０を接続する場合に接続構造１００を適用した場合について説明したが、これに限らず、接続構造１００は多角筒形状、ハット型断面部材を組み合わせて構成した閉断面部材等、様々な閉断面形状部材の接続に適用することができる。また、例えば、閉断面形状の長手部材同士を接続する場合にも適用することができる。この場合には、一方の閉断面部材の端部の外周側と内周側とに他方の閉断面部材の端部と内側部材３０とを入れ子状に嵌め合わせ、嵌め合わせ面を接着することによって長手部材同士を接続するようにしてもよい。 The case where the connection structure 100 is applied to connect the pipe 20 to the cylindrical pipe mounting seat 12 has been described above. It can be applied to the connection of various closed cross-section members such as a closed cross-section member with a closed cross section. Moreover, for example, it can also be applied when connecting longitudinal members having a closed cross-sectional shape. In this case, the end portion of the other closed cross-section member and the inner member 30 are fitted into the outer peripheral side and the inner peripheral side of the end portion of one of the closed cross-section members in a nested manner, and the fitting surfaces are adhered. The longitudinal members may be connected together.

また、上記の実施形態の接続構造１００では、パイプ取付座１２の外周側と内周側の嵌め合わせ面１２ａ，１２ｂの両方がそれぞれ接着剤４０でパイプ２０と内側部材３０と接着されていることとして説明したが、これに限らず、いずれか一方の面を接着剤４０で接着するようにしてもよい。 In addition, in the connection structure 100 of the above embodiment, both the fitting surfaces 12a and 12b on the outer peripheral side and the inner peripheral side of the pipe mounting seat 12 are adhered to the pipe 20 and the inner member 30 with the adhesive 40, respectively. However, the present invention is not limited to this, and either one of the surfaces may be adhered with the adhesive 40 .

１０ステアリングコラムサポート、１１本体、１２パイプ取付座、１２ａ，１２ｂ嵌め合わせ面、１３アーム、２０パイプ、３０内側部材、４０接着剤、１００接続構造。 Reference Signs List 10 steering column support 11 body 12 pipe mounting seat 12a, 12b fitting surface 13 arm 20 pipe 30 inner member 40 adhesive 100 connection structure.

Claims

A connection structure for connecting a first closed cross-section member made of a first material and a second closed cross-section member made of a second material having a coefficient of linear expansion smaller than that of the first material,
The second closed cross-section member is fitted on the outer peripheral side of the first closed cross-section member,
An inner member having a closed cross-section is fitted to the inner peripheral side of the first closed cross- section member in a nested manner with the second closed cross-section member ,
Either one or both of the fitting surfaces on the outer peripheral side and the inner peripheral side of the first closed cross-section member are adhered to the second closed cross-section member or the inner member ,
The inner member is made of a second material having a coefficient of linear expansion smaller than that of the first material ,
A connection structure of closed cross-section members, characterized by: