JP2009150283A - Seal structure of synthetic resin parts - Google Patents

Seal structure of synthetic resin parts Download PDF

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JP2009150283A
JP2009150283A JP2007328122A JP2007328122A JP2009150283A JP 2009150283 A JP2009150283 A JP 2009150283A JP 2007328122 A JP2007328122 A JP 2007328122A JP 2007328122 A JP2007328122 A JP 2007328122A JP 2009150283 A JP2009150283 A JP 2009150283A
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side wall
wall
seal
synthetic resin
contact
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JP5108491B2 (en
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Yasutoshi Mochizuki
泰利 望月
Satoru Naito
内藤　　哲
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Mahle Filter Systems Japan Corp
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Mahle Filter Systems Japan Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To improve a sealing performance in a seal structure utilizing elasticity of a synthetic resin material itself. <P>SOLUTION: In an open edge portion of a resonator body 4, a first sidewall 11 extending along mutual insertion directions of both parts is provided, a first seal face 12 parallel to the insertion direction is provided, and an inclined seal face 13 forming a shape to chop off a corner portion diagonally is provided. In a resonator cover 5, a second sidewall 21 toward an opposite direction of the first sidewall 11 is provided, a second seal face 22 in a face contact with the first seal face 12 is provided, and a step portion 26 having a corner portion 26a in line contact with the inclined seal face 13 and facing the inclined seal face 13 is formed. When both parts are assembled, the corner portion 26a is in line contact with the inclined seal face 13 and the first seal face is in face contact with the second seal face, which forms a double seal. A force to press the first sidewall 11 against the second sidewall 21 is generated by a seal reaction force received by the inclined seal face 13, which enables a high sealing performance to be obtained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、例えば自動車用内燃機関の吸気系におけるレゾネータや吸気ダクト等として好適な合成樹脂製部品に関し、特にその合成樹脂材料自体の弾性を利用したシール構造の改良に関する。   The present invention relates to a synthetic resin part suitable as a resonator or an intake duct in an intake system of, for example, an internal combustion engine for automobiles, and more particularly to improvement of a seal structure using the elasticity of the synthetic resin material itself.

例えば自動車用の内燃機関における吸気騒音を低減するために、共鳴室となるレゾネータを吸気系の適宜位置に設けることが知られているが、このレゾネータやこれに付随する吸気ダクトは、内部空間を外部に対し密閉する必要があるものの、内部密閉空間と外部空間との圧力差が比較的小さいことから、それほど厳重なシール構造は要求されない。従って、これらの吸気系部品を構成する複数の部品をそれぞれ適宜な柔軟性を有する合成樹脂材料のブロー成形や射出成形によって形成し、かつこれらの部品を互いに嵌合させて、部品自体の弾性を利用してシールするようにしたシール構造が採用される傾向にある。   For example, in order to reduce intake noise in an internal combustion engine for automobiles, it is known that a resonator serving as a resonance chamber is provided at an appropriate position in the intake system. However, this resonator and the intake duct associated with the resonator have an internal space. Although it is necessary to seal against the outside, since the pressure difference between the internal sealed space and the external space is relatively small, a very strict seal structure is not required. Therefore, a plurality of parts constituting these intake system parts are respectively formed by blow molding or injection molding of a synthetic resin material having appropriate flexibility, and these parts are fitted to each other so that the elasticity of the parts themselves is increased. There is a tendency to employ a seal structure that utilizes and seals.

例えば、本出願人が先に提案した特許文献１，２には、上面が開口したバケツ状に成形されたレゾネータボディと、その開口を覆うレゾネータカバーと、をそれぞれある程度の柔軟性を有する合成樹脂材料にて成形し、それぞれの開口縁部を嵌合させた状態で、レゾネータカバー周縁のフック部をレゾネータボディ周縁の突起に係合させることにより、共鳴室となる内部空間を密閉するようにした自動車用内燃機関のレゾネータが開示されている。
特開２００２−１９５１１９号公報 特開２０００−１０４６３５号公報 For example, in Patent Documents 1 and 2 previously proposed by the present applicant, a synthetic resin having a certain degree of flexibility in each of a resonator body formed in a bucket shape having an upper surface opened and a resonator cover covering the opening. The inner space that becomes the resonance chamber is sealed by engaging the hook part on the periphery of the resonator cover with the protrusion on the periphery of the resonator body in a state where each opening edge part is fitted. A resonator for an internal combustion engine for an automobile is disclosed.
JP 2002-195119 A JP 2000-104635 A

上記のような合成樹脂製部品のシール構造においては、各々の部品を成形する際にシール構造部分もアンダーカットとならないことが望ましいため、一般に、単純なシール突起と溝との嵌合あるいはシール壁同士の面接触などによってシールがなされているが、このような従来のシール構造では、必ずしも十分なシール性が得られない。特に、吸気系部品のモジュール化などにより大型化した合成樹脂製部品にあっては、その開口縁部でのシール性確保がより困難となり易い。   In the sealing structure of synthetic resin parts as described above, since it is desirable that the sealing structure part does not become undercut when molding each part, generally, a simple fitting between a sealing protrusion and a groove or a sealing wall Sealing is performed by surface contact between the two, but such a conventional sealing structure does not necessarily provide sufficient sealing performance. In particular, in the case of a synthetic resin part that has been enlarged due to the modularization of intake system parts, it is more difficult to ensure the sealing performance at the opening edge.

そこで、この発明は、合成樹脂製の第１部品の開口縁部と第２部品の開口縁部とを互いに嵌合させて内部に密閉空間を形成する合成樹脂製部品のシール構造において、各々の開口縁部の形状の変更により、線接触と面接触との２重シールとし、かつ線接触のシール反力によって面接触の面圧が確保されるようにして、シール性を向上させたものである。   Therefore, the present invention provides a sealing structure for synthetic resin parts in which the opening edge of the first part made of synthetic resin and the opening edge of the second part are fitted to each other to form a sealed space therein. By changing the shape of the opening edge, a double seal with a line contact and a surface contact is obtained, and the surface pressure of the surface contact is secured by the seal reaction force of the line contact to improve the sealing performance. is there.

すなわち一方の第１部品には、両部品の互いの挿入方向に沿って延びる第１側壁が設けられているとともに、該第１側壁の一方の壁面が上記挿入方向に平行な第１シール面として構成され、かつこの第１側壁の他方の壁面と該第１側壁の先端面とが交差する角部を斜めに切り落とした形をなす傾斜シール面が形成されている。   That is, one of the first parts is provided with a first side wall extending along the insertion direction of both parts, and one wall surface of the first side wall serves as a first seal surface parallel to the insertion direction. An inclined sealing surface is formed which is configured and has a shape obtained by obliquely cutting off a corner portion where the other wall surface of the first side wall and the front end surface of the first side wall intersect.

また他方の第２部品には、上記第１側壁と反対側に向かうように上記挿入方向に沿って延びる第２側壁が設けられているとともに、該第２側壁の一方の壁面が、上記挿入方向に平行でかつ上記第１シール面に面接触する第２シール面として構成され、さらに、上記傾斜シール面に対向して該傾斜シール面に線接触する角部を有する段部が形成されているとともに、この段部と上記第２側壁との間に、上記第１側壁の先端部が進入する凹部を備えている。   The other second part is provided with a second side wall extending in the insertion direction so as to face the side opposite to the first side wall, and one wall surface of the second side wall is in the insertion direction. Is formed as a second seal surface that is in parallel with the first seal surface and is in surface contact with the first seal surface, and a step portion having a corner portion that is in line contact with the inclined seal surface is formed opposite to the inclined seal surface. In addition, a recess into which the tip of the first side wall enters is provided between the step and the second side wall.

そして、両部品が組み合わされた状態において、上記角部と上記傾斜シール面とが線接触するとともに上記第１，第２シール面が面接触して、２重シールを構成する。   And in the state which both parts combined, the said corner | angular part and the said inclined sealing surface make line contact, and the said 1st, 2nd sealing surface makes surface contact, and comprises a double seal.

ここで、上記の線接触となる第１部品側の上記傾斜シール面は、両部品の互いの挿入方向に対し傾斜しているので、第２部品の段部の角部に確実に当接し、良好な線接触によるシールが得られると同時に、そのシール反力が、第１側壁を第２側壁へ向けて押し付けるような方向へ発生する。つまり第１側壁が第２側壁の方へ微視的に撓み変形する。従って、第１，第２シール面の間で、良好な面接触によるシール性が得られ、上記の良好な線接触によるシールと相俟って、全体として２重シールによる高いシール性が得られる。   Here, since the inclined seal surface on the first component side that becomes the above-mentioned line contact is inclined with respect to the insertion direction of both components, it surely contacts the corner of the stepped portion of the second component, A seal with good line contact is obtained, and at the same time, the seal reaction force is generated in such a direction as to press the first side wall toward the second side wall. That is, the first side wall is microscopically bent and deformed toward the second side wall. Therefore, a sealing property by a good surface contact is obtained between the first and second sealing surfaces, and a high sealing property by a double seal as a whole is obtained in combination with the sealing by the good line contact. .

本発明の好ましい一つの態様では、上記第１部品にさらに、第１側壁の基部に隣接して係止壁が設けられているとともに、この係止壁と第１側壁との間に、上記第２側壁の先端部が進入する凹部が形成されている。そして、第１，第２側壁が相互に挿入されるときに、上記角部と上記傾斜シール面とが接する前に、上記第２側壁の先端部が上記凹部内に進入するように、上記係止壁の突出量が設定されている。これにより、例えば多少の寸法ばらつき等によって、上記シール反力が局部的に過大となったような場合にも、第２側壁の先端部が第１側壁から離れて浮き上がるようなことがなく、第１，第２シール面の面接触状態が確実に維持される。   In a preferred aspect of the present invention, the first component is further provided with a locking wall adjacent to the base of the first side wall, and the first wall is provided between the locking wall and the first side wall. The recessed part which the front-end | tip part of 2 side walls approachs is formed. Then, when the first and second side walls are inserted into each other, before the corner part and the inclined sealing surface come into contact with each other, the front end part of the second side wall enters the recess. The protruding amount of the stop wall is set. Thereby, for example, even when the seal reaction force becomes locally excessive due to some dimensional variation or the like, the tip of the second side wall does not float away from the first side wall, The surface contact state between the first and second seal surfaces is reliably maintained.

また上記係止壁は、両部品の組立時に、第２側壁を所定位置に案内するガイドとしても機能する。そのため、望ましくは、互いに対向する上記係止壁の内壁面と上記第２側壁の先端側の壁面とが、相補な傾斜面をなす。   The locking wall also functions as a guide for guiding the second side wall to a predetermined position when assembling both parts. Therefore, desirably, the inner wall surface of the locking wall and the wall surface on the distal end side of the second side wall that face each other form a complementary inclined surface.

また、本発明の一つの態様では、両部品が組み合わされたときに、上記第２側壁の先端が上記第１部品に当接することにより、上記角部と上記傾斜シール面との接触部における変形量が管理されるようになっている。このように第２側壁の先端と第１部品との当接により相対位置を管理することにより、第１側壁の先端は（傾斜シール面と角部との接触を除いて）第２部品の凹部底面に対し挿入方向に強く圧接することがないので、上述した第１側壁の微視的な撓み変形を阻害することがない。   In one aspect of the present invention, when the two parts are combined, the tip of the second side wall abuts on the first part, so that deformation at the contact portion between the corner and the inclined sealing surface is achieved. The amount is managed. Thus, by managing the relative position by the contact between the tip of the second side wall and the first part, the tip of the first side wall is a concave part of the second part (except for the contact between the inclined seal surface and the corner). Since it does not press strongly against the bottom surface in the insertion direction, the above-described microscopic deformation of the first side wall is not hindered.

この発明によれば、線接触と面接触との２重シールとなるとともに、線接触のシール反力によって面接触の面圧が確保されるため、全体として高いシール性が得られる。また基本的に複雑なアンダーカットとなるような形状を必要としないので、ブロー成形や射出成形等によって容易に成形することができる。   According to the present invention, a double seal of the line contact and the surface contact is obtained, and the surface pressure of the surface contact is ensured by the seal reaction force of the line contact, so that high sealing performance can be obtained as a whole. In addition, since it does not require a complicated undercut shape, it can be easily formed by blow molding, injection molding, or the like.

以下、この発明の一実施例を図面に基づいて詳細に説明する。   Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

図１〜図３は、この発明の一実施例として、自動車用内燃機関の吸気系に用いられる合成樹脂製のレゾネータ１の一部を示している。このレゾネータ１は、レゾネータ部２と該レゾネータ部２に至る吸気ダクト部３とが一体に構成された比較的大型の吸気系部品であって、上面が開口した下側のレゾネータボディ４と、その上面開口を覆う上側のレゾネータカバー５と、に分割構成されており、両者を組み合わせることで、内部に共鳴室となる空間ならびにこれに至る吸気通路となる空間が形成されている。なお、本願の「密閉空間」とは厳密な意味で完全に密閉されている空間を意味するのではなく、単に部品内の周囲が囲まれた空間を指し、当然のことながら、吸気ダクト部３の端部等は開口した形状をなしている。   1 to 3 show a part of a resonator 1 made of a synthetic resin used in an intake system of an internal combustion engine for an automobile as an embodiment of the present invention. The resonator 1 is a relatively large intake system part in which a resonator unit 2 and an intake duct unit 3 reaching the resonator unit 2 are integrally formed, and includes a lower resonator body 4 having an open upper surface, It is divided into an upper resonator cover 5 that covers the upper surface opening, and by combining them, a space serving as a resonance chamber and a space serving as an intake passage leading to this are formed. The “sealed space” in the present application does not mean a completely sealed space in a strict sense, but simply refers to a space surrounded by the inside of the component. The end portion of each has an open shape.

上記レゾネータボディ４およびレゾネータカバー５は、それぞれ、例えばポリプロピレンのような適宜な柔軟性ならびに弾性を有する合成樹脂材料にて、周縁が立ち上がった皿状に射出成形されており、後述するように各々の開口縁部が互いに嵌合している。そして、レゾネータカバー５の周縁に形成された複数個の矩形のフック部７（図示した部分には１個のみが示されている）が、レゾネータボディ４開口縁の突起８に係合するとともに、レゾネータカバー５の周縁に形成された複数個の係止片９が、レゾネータボディ４開口縁周囲にフランジ状に膨出形成された帯状の膨出部１０のスリット１０ａ（図６参照）を通して該膨出部１０に係合することにより、互いに一体に組み立てられるようになっている。   The resonator body 4 and the resonator cover 5 are each injection-molded into a dish-like shape with a raised peripheral edge made of a synthetic resin material having appropriate flexibility and elasticity, such as polypropylene. Opening edges are fitted together. A plurality of rectangular hook portions 7 (only one is shown in the illustrated portion) formed on the periphery of the resonator cover 5 engage with the protrusions 8 on the opening edge of the resonator body 4, A plurality of locking pieces 9 formed on the periphery of the resonator cover 5 are swelled through slits 10a (see FIG. 6) of a belt-like bulging portion 10 formed in a flange shape around the opening edge of the resonator body 4. By being engaged with the protruding portion 10, they can be assembled together.

図４および図５の断面図は、本発明の要部であるレゾネータボディ４とレゾネータカバー５との間のシール構造を示しており、特に図４は、両者がまだ組み合わされていない状態を示し、図５は、両者が組み合わされた状態を示している。   4 and 5 show the seal structure between the resonator body 4 and the resonator cover 5, which is the main part of the present invention. In particular, FIG. 4 shows a state where the two are not yet combined. FIG. 5 shows a state where both are combined.

この実施例では、レゾネータボディ４が第１部品に相当し、その開口縁部に沿って、第１側壁１１が設けられている。この第１側壁１１は、２つの部品（つまりレゾネータボディ４とレゾネータカバー５）の互いの挿入方向に沿ってベース部１９から延び、特に、その内側（内部空間の側）の壁面が、上記挿入方向に平行な第１シール面１２をなしている。また外側の壁面１１ａも実質的に上記挿入方向と平行である。なお、この実施例では、上記挿入方向は、図４，図５の上下の方向であり、レゾネータボディ４およびレゾネータカバー５の射出成形時の型抜き方向と一致している。上記第１側壁１１の先端面１１ｂと上記壁面１１ａとが交差する先端外側（外部空間の側）の角部は、傾斜シール面１３として斜めに切り落とされた形をなしている。この傾斜シール面１３の上記挿入方向に対する傾斜角は、図示例では４５°程度であるが、材質等に応じて例えば３０°〜６０程度の適当な角度とすることができる。上記先端面１１ｂは、上記挿入方向に対し実質的に直交している。   In this embodiment, the resonator body 4 corresponds to a first component, and a first side wall 11 is provided along the opening edge. The first side wall 11 extends from the base portion 19 along the insertion direction of the two parts (that is, the resonator body 4 and the resonator cover 5), and in particular, the inner wall surface (the side of the internal space) is the insertion wall. A first seal surface 12 parallel to the direction is formed. The outer wall surface 11a is also substantially parallel to the insertion direction. In this embodiment, the insertion direction is the vertical direction in FIGS. 4 and 5, and coincides with the die-cutting direction during injection molding of the resonator body 4 and the resonator cover 5. The corner portion on the outer side of the front end (external space side) where the front end surface 11b of the first side wall 11 and the wall surface 11a intersect each other has a shape that is obliquely cut off as the inclined sealing surface 13. The inclination angle of the inclined seal surface 13 with respect to the insertion direction is about 45 ° in the illustrated example, but can be set to an appropriate angle of about 30 ° to 60 according to the material and the like. The tip surface 11b is substantially orthogonal to the insertion direction.

また、上記第１側壁１１の基部に隣接して該第１側壁１１の内側に係止壁１４が設けられている。この係止壁１４は、第１側壁１１と同じ方向（つまり図の上方）へ向かってベース部１９から延び、第１側壁１１との間に、溝状の凹部１５を形成している。上記係止壁１４の凹部１５側の壁面１４ａは、上記挿入方向に対し比較的緩く傾斜した傾斜面をなしている。この壁面１４ａの傾斜角は、図示するように上記傾斜シール面１３の傾斜角よりも小さい。また、第１側壁１１の基部における上記凹部１５側の壁面１１ｃは、上記壁面１４ａと対称となるような傾斜角でもって部分的に傾斜している。つまり、凹部１５は、底面１５ａと上記壁面１４ａと上記壁面１１ｃとによって、上方へ向かって幅広となる台形状の断面形状を有している。なお、上記ベース部１９は、上記第１側壁１１に比較して厚肉であり、相対的に高い剛性を有している。   Further, a locking wall 14 is provided inside the first side wall 11 adjacent to the base of the first side wall 11. The locking wall 14 extends from the base portion 19 in the same direction as the first side wall 11 (that is, upward in the figure), and a groove-like recess 15 is formed between the locking wall 14 and the first side wall 11. The wall surface 14a on the recess 15 side of the locking wall 14 forms an inclined surface that is relatively loosely inclined with respect to the insertion direction. The inclination angle of the wall surface 14a is smaller than the inclination angle of the inclined sealing surface 13 as shown in the figure. Further, the wall surface 11c on the concave portion 15 side at the base of the first side wall 11 is partially inclined at an inclination angle that is symmetrical to the wall surface 14a. That is, the concave portion 15 has a trapezoidal cross-sectional shape that is widened upward by the bottom surface 15a, the wall surface 14a, and the wall surface 11c. The base portion 19 is thicker than the first side wall 11 and has relatively high rigidity.

さらに、上記第１側壁１１の外側の壁面１１ａから側方へフランジ部１６が延びているとともに、該フランジ部１６の先端から第１側壁１１と同じ方向（つまり図の上方）へ向かってカバー壁１７が延びており、このカバー壁１７と第１側壁１１との間には、比較的大きな溝状の凹部１８が形成されている。上記カバー壁１７は、主に外観品質を確保するためのものであり、基本的に、シール性には関与していない。なお膨出部１０と重複する箇所では、図６に示すように、上記カバー壁１７が膨出部１０に連続し、凹部１８は消失している。   Further, the flange portion 16 extends laterally from the outer wall surface 11a of the first side wall 11, and the cover wall extends from the tip of the flange portion 16 in the same direction as the first side wall 11 (that is, upward in the drawing). 17 extends, and a relatively large groove-shaped recess 18 is formed between the cover wall 17 and the first side wall 11. The cover wall 17 is mainly for ensuring appearance quality, and is basically not involved in sealing performance. In addition, in the location which overlaps with the bulging part 10, as shown in FIG. 6, the said cover wall 17 continues to the bulging part 10, and the recessed part 18 has lose | disappeared.

一方、第２部品に相当するレゾネータカバー５には、その開口縁部に沿って、第２側壁２１が設けられている。この第２側壁２１は、ベース部２３から上記の挿入方向に沿って、かつ第１側壁１１とは反対に図の下方へ向かって延びており、特に、その外側（外部空間の側）の壁面が、上記挿入方向に平行な第２シール面２２をなしている。また、内側（内部空間の側）の壁面２１ａも基本的に上記挿入方向と平行であるが、先端部においては、その内側の壁面２１ｂは、比較的広い範囲に亘り、レゾネータボディ４側の係止壁１４の傾斜壁面１４ａと相補な傾斜角でもって傾斜している。また、第２側壁２１の第２シール面２２の先端側には、レゾネータボディ４側の凹部１５の壁面１１ｃと相補な傾斜面２１ｃが設けられている。なお、上記凹部１５の底面１５ａに対向する第２側壁２１の先端面２１ｄは、上記挿入方向に対し実質的に直交している。   On the other hand, the resonator cover 5 corresponding to the second component is provided with a second side wall 21 along the opening edge. The second side wall 21 extends from the base portion 23 along the insertion direction and downward in the figure opposite to the first side wall 11, and in particular, a wall surface on the outer side (external space side). However, it forms the second sealing surface 22 parallel to the insertion direction. In addition, the inner wall surface 21a is basically parallel to the insertion direction. However, at the tip, the inner wall surface 21b extends over a relatively wide area on the resonator body 4 side. The stop wall 14 is inclined at an inclination angle complementary to the inclined wall surface 14a. In addition, an inclined surface 21 c complementary to the wall surface 11 c of the recess 15 on the resonator body 4 side is provided on the distal end side of the second seal surface 22 of the second side wall 21. The tip surface 21d of the second side wall 21 facing the bottom surface 15a of the recess 15 is substantially orthogonal to the insertion direction.

上記ベース部２３は、上記第２側壁２１に比較して相対的に高い剛性を有するように厚肉となっているものであって、上記第２側壁２１の基部から側方（外側）へ延び、さらにその先端から第２側壁２１と同じ方向（つまり図の下方）へ向かってカバー壁２４が延びている。これにより、上記カバー壁２４と第２側壁２１との間に、比較的大きな凹部２５が形成されている。なお、上記カバー壁２４は、やはり主に外観品質を確保するためのものであり、基本的に、シール性には関与していない。   The base portion 23 is thick so as to have relatively higher rigidity than the second side wall 21, and extends from the base portion of the second side wall 21 to the side (outside). Further, a cover wall 24 extends from the tip in the same direction as the second side wall 21 (that is, downward in the drawing). Thereby, a relatively large recess 25 is formed between the cover wall 24 and the second side wall 21. The cover wall 24 is mainly for ensuring the appearance quality, and basically does not participate in the sealing performance.

上記凹部２５内には、上記傾斜シール面１３に対向する矩形の段部２６が形成されており、この段部２６と上記第２側壁２１との間に、矩形断面に凹んだ溝状の凹部２７が残されている。上記段部２６は、９０°折れ曲がった角部２６ａを有し、この角部２６ａの位置は、上記傾斜シール面１３の中間付近に対応している。   A rectangular step 26 facing the inclined sealing surface 13 is formed in the recess 25, and a groove-like recess recessed in a rectangular cross section between the step 26 and the second side wall 21. 27 remains. The step portion 26 has a corner portion 26 a bent by 90 °, and the position of the corner portion 26 a corresponds to the middle of the inclined seal surface 13.

上記の説明ならびに図４から明らかなように、レゾネータボディ４の開口縁部およびレゾネータカバー５の開口縁部のいずれも、成形時にアンダーカットとなる部分を有しておらず、従って、通常の射出成形によって容易に成形することができる。   As is clear from the above description and FIG. 4, neither the opening edge of the resonator body 4 nor the opening edge of the resonator cover 5 has an undercut portion during molding. It can be easily molded by molding.

上記のように構成されたレゾネータボディ４およびレゾネータカバー５を互いに嵌合させ、かつ前述したフック部７等により両者を固定保持した状態では、図５に示すように、第１側壁１１の第１シール面１２と第２側壁２１の第２シール面２２とが重なり合って互いに面接触し、かつ同時に、段部２６の角部２６ａが傾斜シール面１３に線接触する。そして、互いに反対方向へ延びる第１側壁１１の先端部は段部２６に隣接する凹部２７内に進入し、第２側壁２１の先端部は係止壁１４により形成される凹部１５内に進入する。また、各々のカバー壁１７，２４は互いに非接触で重なり合い、レゾネータカバー５側のカバー壁２４がレゾネータボディ４側のカバー壁１７内側の凹部１８内に入り込んだ形となる。   In a state where the resonator body 4 and the resonator cover 5 configured as described above are fitted to each other and both are fixedly held by the hook portion 7 or the like described above, as shown in FIG. The seal surface 12 and the second seal surface 22 of the second side wall 21 overlap each other and come into surface contact with each other, and at the same time, the corner portion 26 a of the step portion 26 comes into line contact with the inclined seal surface 13. And the front-end | tip part of the 1st side wall 11 extended in the mutually opposite direction enters into the recessed part 27 adjacent to the step part 26, and the front-end | tip part of the 2nd side wall 21 enters into the recessed part 15 formed of the locking wall 14. FIG. . Further, the cover walls 17 and 24 overlap each other in a non-contact manner, and the cover wall 24 on the resonator cover 5 side enters the recess 18 inside the cover wall 17 on the resonator body 4 side.

ここで、角部２６ａと線接触する傾斜シール面１３は、両部品の互いの挿入方向に対し傾斜しているので、両者は確実に当接し、良好な線接触によるシールが得られると同時に、そのシール反力が、第１側壁１１を第２側壁２１へ向けて押し付けるような方向へ発生する。つまり第１側壁１１が第２側壁２１の方へ微視的に撓み変形する。従って、第１，第２シール面１２，２２の間の面圧が確保され、良好な面接触によるシール性が得られる。従って、線接触によるシールと面接触によるシールとが相俟って、全体として２重シールによる高いシール性が得られる。第２シール面２２に連なる傾斜面２１ｃは、第１シール面１２に連なる傾斜した壁面１１ｃとやはり面接触し、実質的にシール面の一部をなしている。   Here, since the inclined sealing surface 13 that is in line contact with the corner portion 26a is inclined with respect to the insertion direction of both parts, the two abut against each other reliably, and at the same time, a seal with good line contact is obtained. The seal reaction force is generated in such a direction as to press the first side wall 11 toward the second side wall 21. That is, the first side wall 11 is microscopically bent and deformed toward the second side wall 21. Therefore, the surface pressure between the first and second sealing surfaces 12 and 22 is ensured, and the sealing performance by good surface contact is obtained. Therefore, the seal by the line contact and the seal by the surface contact are combined, and high sealing performance by the double seal is obtained as a whole. The inclined surface 21c connected to the second seal surface 22 is also in surface contact with the inclined wall surface 11c connected to the first seal surface 12 and substantially forms a part of the seal surface.

また、第２側壁２１の先端部の内側の傾斜した壁面２１ｂと係止壁１４の傾斜した壁面１４ａとの間には、設計上はごく僅かな隙間が与えられている。但し、例えば寸法ばらつき等により上記シール反力が局部的に過大となったような場合には、内側へ変位した第２側壁２１の先端の壁面２１ｂが係止壁１４の壁面１４ａに当接する。従って、第２側壁２１が第１側壁１１から離れて浮き上がるようなことがなく、第１，第２シール面１２，２２の面接触状態が確実に維持される。そして、上記係止壁１４は、上記の第２側壁２１側の傾斜壁面２１ｂとともに、組立時に第２側壁２１を所定位置に案内するガイドとしても機能し、両者の組立がより容易となる。特に、所定の挿入方向に沿った挿入時に、角部２６ａが傾斜シール面１３に当接する前（つまり側方へのシール反力が生じる前）に、第２側壁２１の先端が凹部１５内に入り込むように、係止壁１４の高さ寸法が設定されており、確実なガイド機能が得られる。   Further, a very small gap is provided in design between the inclined wall surface 21 b inside the tip of the second side wall 21 and the inclined wall surface 14 a of the locking wall 14. However, when the seal reaction force is locally excessive due to, for example, dimensional variation, the wall surface 21b at the tip of the second side wall 21 displaced inwardly contacts the wall surface 14a of the locking wall 14. Therefore, the second side wall 21 does not float away from the first side wall 11, and the surface contact state of the first and second seal surfaces 12, 22 is reliably maintained. And the said locking wall 14 functions also as a guide which guides the 2nd side wall 21 to a predetermined position at the time of an assembly with the inclined wall surface 21b by the side of the said 2nd side wall 21, and assembling both becomes easier. In particular, the tip of the second side wall 21 is inserted into the recess 15 before the corner portion 26a abuts against the inclined sealing surface 13 (that is, before the side seal reaction force is generated) during insertion along a predetermined insertion direction. The height dimension of the locking wall 14 is set so as to enter, and a reliable guide function is obtained.

また、設計上は、レゾネータボディ４とレゾネータカバー５とが組み合わされたときに、レゾネータカバー５側の第２側壁２１の先端面２１ｄがレゾネータボディ４側の凹部１５の底面１５ａに当接し、これによってレゾネータボディ４とレゾネータカバー５との相対的な位置が規定されるようになっている。このとき、上記角部２６ａと傾斜シール面１３とが上記挿入方向に沿って当接し、かつ一定量（例えば０．２ｍｍ）だけ変位するように、各部の寸法が設定されている。従って、角部２６ａと傾斜シール面１３との接触部における変形量が各部で常に一定に管理され、安定したシール性が得られる。なお、図５では、説明のために、実際には互いに圧接して変位する角部２６ａと傾斜シール面１３とが、変形せずに互いにオーバラップした形に図示されている。また、第２側壁２１の先端面２１ｄがレゾネータボディ４に優先的に当接して相対位置を管理することにより、設計上は、第１側壁１１の先端面１１ｂが凹部２７の底面２７ａに圧接せず、両者間にごく僅かな隙間が存在するので、上述したシール反力による第１側壁１１の微視的な撓み変形を阻害することがなく、第１，第２シール面１２，２２の間の面圧がより確実に確保される。   Further, by design, when the resonator body 4 and the resonator cover 5 are combined, the tip surface 21d of the second side wall 21 on the resonator cover 5 side comes into contact with the bottom surface 15a of the recess 15 on the resonator body 4 side. Thus, the relative position between the resonator body 4 and the resonator cover 5 is defined. At this time, the dimension of each part is set so that the corner 26a and the inclined sealing surface 13 are in contact with each other along the insertion direction and are displaced by a certain amount (for example, 0.2 mm). Therefore, the amount of deformation at the contact portion between the corner portion 26a and the inclined sealing surface 13 is always managed to be constant in each portion, and a stable sealing property can be obtained. In FIG. 5, for the sake of explanation, the corner portions 26 a that are actually pressed against each other and displaced and the inclined sealing surface 13 are illustrated in an overlapping manner without being deformed. Further, the tip surface 21d of the second side wall 21 preferentially contacts the resonator body 4 to manage the relative position, so that the tip surface 11b of the first side wall 11 is pressed against the bottom surface 27a of the recess 27 by design. In addition, since there is a very small gap between the two, the microscopic deformation of the first side wall 11 due to the seal reaction force described above is not hindered, and the first and second seal surfaces 12 and 22 are not disturbed. The surface pressure is ensured more reliably.

このように、上記実施例の構成によれば、別部品のシール部材を用いることなく合成樹脂製のレゾネータボディ４およびレゾネータカバー５自体によってより高いシール性が得られる。そのため、レゾネータとしての騒音減衰作用が所期の特性でもって確保でき、また経時的にも安定した性能を維持することができる。   Thus, according to the structure of the said Example, a higher sealing performance is acquired by the resonator body 4 and the resonator cover 5 itself made from a synthetic resin, without using a separate sealing member. Therefore, the noise attenuation action as a resonator can be secured with the desired characteristics, and stable performance can be maintained over time.

なお、図４，図５に示したシール構造は、実際には、中空のレゾネータ１の両側に設けられており、従って、レゾネータボディ４の両側の一対の第１側壁１１の内側にレゾネータカバー５の両側の第２側壁２１がはまり込むことになるが、上述した本発明のシール構造は、このような内側の部品と外側の部品との間の締まりばめの関係に依存することなく、図４，図５に示した個々の側のシール構造でもって単独にシール作用が得られる。従って、部品の大きさに無関係に所期のシール性が確保され、近年のモジュール化した大型吸気系部品に特に適したものとなる。また、上記実施例は、図６に明らかなように、レゾネータ１の開口縁部が直線状をなす部分を図示しているが、複雑な曲線部分においても同様のシール構造を備えている。   The seal structure shown in FIGS. 4 and 5 is actually provided on both sides of the hollow resonator 1. Accordingly, the resonator cover 5 is provided inside the pair of first side walls 11 on both sides of the resonator body 4. However, the above-described seal structure of the present invention does not depend on the interference-fitting relationship between the inner part and the outer part. 4, the sealing action can be obtained independently with the individual side seal structure shown in FIG. Therefore, the desired sealing performance is ensured regardless of the size of the part, and it is particularly suitable for a large-sized intake system part that has been modularized in recent years. Moreover, although the said Example has illustrated the part in which the opening edge part of the resonator 1 makes | forms linear form evidently in FIG. 6, it has the same sealing structure also in a complicated curve part.

以上、この発明を内燃機関のレゾネータに適用した一実施例について説明したが、この発明のシール構造は、上記実施例に限定されず、種々のダクト状のものや箱状のものなどの合成樹脂製部品に広く適用することができる。また射出成形に限らず、ブロー成形などの他の成形方法によって成形する場合にも同様に適用が可能である。なお、上記実施例では、第１側壁１１が外部空間の側に、第２側壁２１が内部空間の側に、それぞれ設けられているが、本発明がこれに限定されないことは言うまでもない。   As mentioned above, one embodiment in which the present invention is applied to a resonator of an internal combustion engine has been described. However, the seal structure of the present invention is not limited to the above embodiment, and various synthetic resins such as duct-shaped and box-shaped ones. Can be widely applied to manufactured parts. Further, the present invention is not limited to injection molding and can be similarly applied to molding by other molding methods such as blow molding. In the above embodiment, the first side wall 11 is provided on the outer space side and the second side wall 21 is provided on the inner space side, but it goes without saying that the present invention is not limited to this.

この発明に係るシール構造を備えたレゾネータの組立状態を示す要部の正面図。The front view of the principal part which shows the assembly state of the resonator provided with the seal structure which concerns on this invention. レゾネータボディの要部の正面図。The front view of the principal part of a resonator body. レゾネータカバーの要部の正面図。The front view of the principal part of a resonator cover. レゾネータボディとレゾネータカバーとの間のシール構造を示す分解断面図。FIG. 3 is an exploded cross-sectional view showing a seal structure between a resonator body and a resonator cover. 同シール構造を組立状態で示す断面図。Sectional drawing which shows the seal structure in an assembly state. レゾネータボディの要部を示す平面図。The top view which shows the principal part of a resonator body.

符号の説明Explanation of symbols

４…レゾネータボディ
５…レゾネータカバー
１１…第１側壁
１２…第１シール面
１３…傾斜シール面
１４…係止壁
１５…凹部
２１…第２側壁
２２…第２シール面
２６…段部
２６ａ…角部 DESCRIPTION OF SYMBOLS 4 ... Resonator body 5 ... Resonator cover 11 ... 1st side wall 12 ... 1st sealing surface 13 ... Inclined sealing surface 14 ... Locking wall 15 ... Recessed part 21 ... 2nd side wall 22 ... 2nd sealing surface 26 ... Step part 26a ... Corner Part

Claims (4)

合成樹脂製の第１部品の開口縁部と第２部品の開口縁部とを互いに嵌合させて内部に密閉空間を形成する合成樹脂製部品のシール構造において、
上記第１部品に、両部品の互いの挿入方向に沿って延びる第１側壁が設けられているとともに、該第１側壁の一方の壁面が上記挿入方向に平行な第１シール面として構成され、かつこの第１側壁の他方の壁面と該第１側壁の先端面とが交差する角部を斜めに切り落とした形をなす傾斜シール面が形成されており、
上記第２部品には、上記第１側壁と反対側に向かうように上記挿入方向に沿って延びる第２側壁が設けられているとともに、該第２側壁の一方の壁面が、上記挿入方向に平行でかつ上記第１シール面に面接触する第２シール面として構成され、さらに、上記傾斜シール面に対向して該傾斜シール面に線接触する角部を有する段部が形成されているとともに、この段部と上記第２側壁との間に、上記第１側壁の先端部が進入する凹部を備え、
両部品が組み合わされた状態において、上記角部と上記傾斜シール面とが線接触するとともに上記第１，第２シール面が面接触して、２重シールを構成することを特徴とする合成樹脂製部品のシール構造。 In the sealing structure of the synthetic resin part in which the opening edge part of the first part made of synthetic resin and the opening edge part of the second part are fitted to each other to form a sealed space inside,
The first part is provided with a first side wall extending along the insertion direction of both parts, and one wall surface of the first side wall is configured as a first seal surface parallel to the insertion direction, And the inclined sealing surface which makes the shape which diagonally cut off the corner | angular part which the other wall surface of this 1st side wall and the front end surface of this 1st side wall cross | intersect is formed,
The second component is provided with a second side wall extending in the insertion direction so as to face the side opposite to the first side wall, and one wall surface of the second side wall is parallel to the insertion direction. And a second seal surface that is in surface contact with the first seal surface, and a step portion having a corner portion that is in line contact with the inclined seal surface is formed opposite to the inclined seal surface. Between the step and the second side wall, a recess into which the tip of the first side wall enters,
A synthetic resin characterized in that in a state where both parts are combined, the corner and the inclined sealing surface are in line contact and the first and second sealing surfaces are in surface contact to form a double seal. Seal structure for manufactured parts. 上記第１部品にさらに、第１側壁の基部に隣接して係止壁が設けられているとともに、この係止壁と第１側壁との間に、上記第２側壁の先端部が進入する凹部が形成されており、
第１，第２側壁が相互に挿入されるときに、上記角部と上記傾斜シール面とが接する前に、上記第２側壁の先端部が上記凹部内に進入するように、上記係止壁の突出量が設定されていることを特徴とする請求項１に記載の合成樹脂製部品のシール構造。 The first component is further provided with a locking wall adjacent to the base of the first side wall, and a recess into which the tip of the second side wall enters between the locking wall and the first side wall. Is formed,
When the first and second side walls are inserted into each other, the locking wall is arranged so that the tip of the second side wall enters the recess before the corner and the inclined sealing surface come into contact with each other. The projecting amount of is set, and the sealing structure for synthetic resin parts according to claim 1. 互いに対向する上記係止壁の内壁面と上記第２側壁の先端側の壁面とが、相補な傾斜面をなすことを特徴とする請求項２に記載の合成樹脂製部品のシール構造。   3. The synthetic resin component sealing structure according to claim 2, wherein an inner wall surface of the locking wall and a wall surface on the tip end side of the second side wall facing each other form a complementary inclined surface. 両部品が組み合わされたときに、上記第２側壁の先端が上記第１部品に当接することにより、上記角部と上記傾斜シール面との接触部における変形量が管理されることを特徴とする請求項１〜３のいずれかに記載の合成樹脂製部品のシール構造。   When the two parts are combined, the amount of deformation at the contact portion between the corner and the inclined sealing surface is controlled by the tip of the second side wall contacting the first part. A seal structure for a synthetic resin part according to any one of claims 1 to 3.
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JP2012207557A (en) * 2011-03-29 2012-10-25 Toyoda Gosei Co Ltd Duct
CN103939616A (en) * 2014-04-11 2014-07-23 东南大学 High-performance low-noise sealing device based on Helmholtz resonance principle
JP2020051411A (en) * 2018-09-28 2020-04-02 豊田合成株式会社 Duct device
JP2021081570A (en) * 2019-11-19 2021-05-27 株式会社リコー Component, cooling device, and image forming apparatus

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JP2000104635A (en) * 1998-09-30 2000-04-11 Tennex Corp Suction resonator of automobile
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JP2012207557A (en) * 2011-03-29 2012-10-25 Toyoda Gosei Co Ltd Duct
CN103939616A (en) * 2014-04-11 2014-07-23 东南大学 High-performance low-noise sealing device based on Helmholtz resonance principle
CN103939616B (en) * 2014-04-11 2016-02-10 东南大学 Based on high-performance, the low noise seal arrangement of Helmholtz resonance principle
JP2020051411A (en) * 2018-09-28 2020-04-02 豊田合成株式会社 Duct device
JP7056494B2 (en) 2018-09-28 2022-04-19 豊田合成株式会社 Duct device
JP2021081570A (en) * 2019-11-19 2021-05-27 株式会社リコー Component, cooling device, and image forming apparatus
JP7360620B2 (en) 2019-11-19 2023-10-13 株式会社リコー Parts, cooling equipment and image forming equipment

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