JP4032541B2

JP4032541B2 - Air passage opening and closing device

Info

Publication number: JP4032541B2
Application number: JP34878098A
Authority: JP
Inventors: 上村　　幸男
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 1998-12-08
Filing date: 1998-12-08
Publication date: 2008-01-16
Anticipated expiration: 2018-12-08
Also published as: JP2000168340A

Description

【０００１】
【発明の属する技術分野】
本発明は、空気を通過させる開口部が形成された膜状部材（フィルムドア）を空気通路中で移動させることによって空気通路を開閉する空気通路開閉装置において、特に、膜状部材の端部と回転軸との固定構造に関するもので、例えば、車両用空調装置に用いて好適なものである。
【０００２】
【従来の技術】
従来、特開平５−２９６５５３号公報には、回転軸の外周面の一部に、軸方向に延びる平坦面を形成し、この平坦面と、回転軸とは別体の抑え部材との間で膜状部材の端部を挟み込むことにより、膜状部材の端部を回転軸に固定する構造が記載されている。
【０００３】
【発明が解決しようとする課題】
ところで、上記従来技術によると、膜状部材と回転軸との固定のために、抑え部材という別部品を特別に必要とし、コストアップを招くという問題がある。
そこで、本発明は上記点に鑑み、膜状部材と回転軸とを、別部品を必要としない簡潔な構成で固定できるようにすることを目的とする。
【０００４】
【課題を解決するための手段】
上記目的を達成するため、請求項１記載の発明では、空気が流通可能な開口部（１６ａ）を有する膜状部材（１６）をケース（１０）内に移動可能に配置し、
膜状部材（１６）の一端側を第１の回転軸（１４）に固定するとともに、膜状部材（１６）の他端側を第２の回転軸（１５）に固定し、
第１の回転軸（１４）および第２の回転軸（１５）に膜状部材（１６）を巻き取り、巻き戻しすることにより、膜状部材（１６）の開口部（１６ａ）を移動させて、ケース（１０）の空気通路（１１〜１３）を開閉する空気通路開閉装置において、
回転軸（１４、１５）の外周面の軸方向の複数箇所に凹部（３０）を分割形成するとともに、この複数箇所の凹部（３０）にそれぞれ突起部（３１）を形成し、
かつ、突起部（３１）の高さを凹部（３０）の深さ（ｈ）と同等以下にし、
膜状部材（１６）の端部には、凹部（３０）に嵌まり込む複数の取付片（３２）を突出形成し、
この複数の取付片（３２）にそれぞれ取付孔（３３）を形成し、この取付孔（３３）を突起部（３１）に挿通することにより取付片（３２）を突起部（３１）により係止して、膜状部材（１６）の端部を凹部（３０）に固定することを特徴としている。
また、請求項２記載の発明では、空気が流通可能な開口部（１６ａ）を有する膜状部材（１６）をケース（１０）内に移動可能に配置し、
膜状部材（１６）の一端側を第１の回転軸（１４）に固定するとともに、膜状部材（１６）の他端側を第２の回転軸（１５）に固定し、
第１の回転軸（１４）および第２の回転軸（１５）に膜状部材（１６）を巻き取り、巻き戻しすることにより、膜状部材（１６）の開口部（１６ａ）を移動させて、ケース（１０）の空気通路（１１〜１３）を開閉する空気通路開閉装置において、
回転軸（１４、１５）の外周面の軸方向の複数箇所に凹部（３０）を分割形成するとともに、この複数箇所の凹部（３０）にそれぞれ突起部（３１）を樹脂により成形し、
かつ、突起部（３１）の高さを凹部（３０）の深さ（ｈ）と同等以下にし、
膜状部材（１６）の端部には、凹部（３０）に嵌まり込む複数の取付片（３２）を突出形成し、
この複数の取付片（３２）にそれぞれ取付孔（３３）を形成し、この取付孔（３３）を突起部（３１）にそれぞれ挿通した後に、突起部（３１）を熱かしめすることにより、膜状部材（１６）の端部を凹部（３０）に固定することを特徴としている。
また、請求項３記載の発明では、空気が流通可能な開口部（１６ａ）を有する膜状部材（１６）をケース（１０）内に移動可能に配置し、
膜状部材（１６）の一端側を第１の回転軸（１４）に固定するとともに、膜状部材（１６）の他端側を第２の回転軸（１５）に固定し、
第１の回転軸（１４）および第２の回転軸（１５）に膜状部材（１６）を巻き取り、巻き戻しすることにより、膜状部材（１６）の開口部（１６ａ）を移動させて、ケース（１０）の空気通路（１１〜１３）を開閉する空気通路開閉装置において、
回転軸（１４、１５）の外周面の軸方向の複数箇所に凹部（３０）を分割形成するとともに、この複数箇所の凹部（３０）にそれぞれ係止用の鉤形状を有する突起部（３１）を形成し、
かつ、突起部（３１）の高さを凹部（３０）の深さ（ｈ）と同等以下にし、
膜状部材（１６）の端部には、凹部（３０）に嵌まり込む複数の取付片（３２）を突出形成し、
この複数の取付片（３２）にそれぞれ取付孔（３３）を形成し、この取付孔（３３）を鉤形状の突起部（３１）に挿通することにより膜状部材（１６）の端部を凹部（３０）に固定することを特徴としている。
【０００５】
上記した請求項１、請求項２及び請求項３記載の発明によると、回転軸（１４、１５）と一体の突起部（３１）を用いて、膜状部材（１６）の端部を凹部（３０）に固定できるので、従来技術のような抑え部材という別部品を必要とせず、部品点数の低減によりコスト低減を達成できる。
しかも、突起部（３１）の高さを凹部（３０）の深さ（ｈ）と同等以下にしているから、回転軸（１４、１５）の外周面より突起部（３１）が突出しない。そのため、突起部（３１）の存在により回転軸（１４、１５）の円形軸形状が阻害されることがない。
【０００６】
その結果、膜状部材（１６）の回転軸（１４、１５）への巻き取り、巻き戻し動作をスムースに行うことができるので、突起部（３１）の突出により、膜状部材（１６）の巻き取り時にしわが発生することを回避でき、このしわによる異音の発生等の不具合をも確実に防止できる。
また、請求項１、２、３記載の発明では、凹部（３０）を、回転軸（１４、１５）の外周面の軸方向に複数箇所に分割形成し、膜状部材（１６）の端部には、凹部（３０）に嵌まり込む複数の取付片（３２）を突出形成し、この取付片（３２）に取付孔（３３）を形成している。
これによると、回転軸側の、複数の凹部（３０）相互間に円形軸部（３４）を形成できるので、この円形軸部（３４）をガイドとして膜状部材（１６）の回転軸（１４、１５）への巻き取り、巻き戻し動作を一層スムースに行うことができる。
また、請求項２記載の発明では、前述のごとく回転軸（１４、１５）に突起部（３１）が樹脂により成形されており、この突起部（３１）に膜状部材（１６）の端部の取付孔（３３）を挿通した後に、この突起部（３１）を熱かしめすることにより、膜状部材（１６）の端部を凹部（３０）に固定している。
【０００７】
これによると、回転軸（１４、１５）に一体成形した樹脂製突起部（３１）を熱かしめするという簡単な工程にて膜状部材（１６）の端部を確実に固定できる。
また、請求項３記載の発明では、前述のごとく突起部（３１）は係止用の鉤形状を有し、この鉤形状の突起部（３１）に膜状部材（１６）の端部の取付孔（３３）を挿通することにより膜状部材（１６）の端部を凹部（３０）に固定している。
【０００８】
これによると、突起部（３１）の鉤形状を利用して、突起部（３１）に膜状部材（１６）の端部の取付孔（３３）を挿通するだけで、熱かしめ等も必要とせずに、より一層簡単に膜状部材（１６）の端部を確実に固定できる。
【０００９】
なお、上記括弧内の符号は、後述する実施形態記載の具体的手段との対応関係を示すものである。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図に基づいて説明する。
（第１実施形態）
図１ないし図６は本発明を車両用空調装置に適用した第１実施形態を示しており、本実施形態における車両用空調装置は、樹脂製のケース１０を有しており、このケース１０は空調装置の空気通路を形成するもので、例えば、車室内計器盤の車両幅（左右）方向の中央部の内部に設置される。
【００１１】
そして、送風ユニット（図示せず）からの送風空気がケース１０内に流入して、ケース１０内の図示しない蒸発器（冷却用熱交換器）、ヒータコア（加熱用熱交換器）等の熱交換器と熱交換して、温度調整された後に、ケース１０の空気下流端に設けられた複数の吹出開口部１１〜１３から車室内の所定場所に向けて空気を吹き出すようになっている。
【００１２】
この吹出開口部としては、具体的には、空調空気を車室内フロントガラス内面に向けて吹き出すためのデフロスタ開口部１１と、空調空気を乗員上半身に向けて吹き出すフェイス開口部１２と、空調空気を乗員の足元部に向けて吹き出すフット開口部１３が設けられている。
ケース１０内には、駆動軸（第１の回転軸）１４と従動軸（第２の回転軸）１５が、ケース１０に対して回転自在に支持されている。この駆動軸１４および従動軸１５には、可撓性部材、具体的には、ポリエチレン樹脂のごとく可撓性、強度に優れた樹脂製フィルム部材にて構成された吹出モード切換用膜状部材１６の両端が固定され、巻回されている。そして、この吹出モード切換用膜状部材１６には、空気を通過させるための複数の開口部１６ａが形成されている。
【００１３】
図１に示すように、駆動軸１４および従動軸１５との間の中間部位には中間ガイド軸１７が配置されており、この中間ガイド軸１７は、ケース１０の内壁面に沿って吹出モード切換用膜状部材１６を屈曲させて吹出モード切換用膜状部材１６の移動をガイドする。この中間ガイド軸１７は、吹出モード切換用膜状部材１６の移動を円滑にするために回転自在な構成としてもよいが、本例では、中間ガイド軸１７を樹脂製のケース１０に固定された回転不能な構成として、コスト低減を図っている。
【００１４】
そして、吹出モード切換用膜状部材１６は、駆動軸１４と中間ガイド軸１７と従動軸１５とによって、前記各吹出開口部１１〜１３の空気上流側壁面と対向するようにして一定の張力が付与された状態で設けられ、この壁面に沿って移動するようになっている。
上記駆動軸１４は図１に示すステップモータ（駆動手段）１８によって回転駆動される。吹出モード切換用膜状部材１６は、上記ステップモータ１８により駆動軸１４を正逆両方向に回転させて膜状部材１６（すなわち、開口部１６ａ）を任意の位置で停止させることによって、この開口部１６ａと前記各吹出開口部１１〜１３との連通、遮断を切り換えることにより、吹出モードが切り換えられる。
【００１５】
次に、吹出モード切換用膜状部材１６の駆動機構の具体的構成について詳細に説明する。駆動軸１４と従動軸１５はともに樹脂製であり、この両軸１４、１５には吹出モード切換用膜状部材１６の両端部が本発明による後述の手段にて固定される。
駆動軸１４は図２に示すように中空部を持たない通常の軸形状である。この駆動軸１４の一端部には小径軸部１４ａが形成され、この小径軸部１４ａはケース１０の軸受穴１９に回転自在に支持される。また、駆動軸１４の他端部には、断面Ｄ字状の連結穴１４ｂが形成され、この連結穴１４ｂに樹脂製の軸押さえ部材（ブッシュ）２０の断面Ｄ字状の挿入部２０ａを嵌入して、軸押さえ部材２０と駆動軸１４とを回転方向に対して一体に連結する。
【００１６】
軸押さえ部材２０の軸部２０ｂはケース１０の軸受穴２１内に回転自在に嵌入され、支持されている。すなわち、軸押さえ部材２０を駆動軸１４およびケース１０に対して組付けることにより、駆動軸１４の他端側が軸押さえ部材２０を介して軸受穴２１に回転自在に支持される。
軸押さえ部材２０はケース１０の外部に配置される円形の本体部２０ｃを有し、この本体部２０ｃに上記した挿入部２０ａと軸部２０ｂが樹脂にて一体成形されている。
【００１７】
軸押さえ部材２０のうち、ケース１０の外部に配置される本体部２０ｃにはステップモータ１８の出力軸１８ａが連結される。以上により、ステップモータ１８の回転が軸押さえ部材２０を介して駆動軸１４に伝達されて、駆動軸１４が回転するようになっている。
一方、従動軸１５はその中心部に軸方向の中空穴１５ａを有する中空形状（円筒形状）に形成されている。従動軸１５の一端部には小径軸部１５ｂが形成され、この小径軸部１５ｂはケース１０の軸受穴２２に回転自在に支持される。中空穴１５ａは従動軸１５の一端側で閉塞し、他端側（図２の左端部）は外部へ開口している。
【００１８】
そして、従動軸１５の中空穴１５ａ内には、樹脂製の案内棒２３が挿入される。この案内棒２３はばね取付用軸部２３ａを有しており、このばね取付用軸部２３ａは、従動軸１５の中空穴１５ａの内周面との間にコイルばね（弾性手段）２４を配置可能な空隙を形成するように案内棒２３のうち最も小径に成形されている。
【００１９】
コイルばね２４はこの取付用軸部２３ａの外周面上に巻き付けられ、その一端部（図２の右端部）を取付用軸部２３ａの先端の係止溝２３ｂに嵌入係止して、コイルばね２４の一端部を取付用軸部２３ａの先端に固定するようになっている。また、案内棒２３において、取付用軸部２３ａの根元側には、取付用軸部２３ａより所定量だけ外径を大きくした嵌合支持面２３ｃが成形され、この嵌合支持面２３ｃは所定長さにわたって従動軸１５の内周面と嵌合し、この嵌合長さの部分にて従動軸１５の他端側を案内棒２３により回転自在に支持する。
【００２０】
また、従動軸１５の他端側には軸方向に所定長さにわたって延びるスリット状の係止溝１５ｃが形成してある。また、コイルばね２４の他端部２４ａは取付用軸部２３ａの外周面から半径方向の外方へ折り曲げておき、この他端部（腕部）２４ａを係止溝１５ｃ内に嵌入係止するようにしてある。さらに、案内棒２３の嵌合支持面２３ｃのうち、外方側の部分はケース１０の固定穴２５に対して圧入等の手段で嵌合固定される。
【００２１】
次に、案内棒２３およびコイルばね２４部分の組付方法について説明すると、案内棒２３の取付用軸部２３ａにコイルばね２４を巻き付け、取付用軸部２３ａの先端の係止溝部２３ｂにコイルばね２４の一端部を固定する。一方、コイルばね２４の他端部２４ａは半径方向の外方へ折り曲げておく。次に、ケース１０の固定穴２５を通して案内棒２３の取付用軸部２３ａを従動軸１５の中空穴１５ａ内に挿入する。
【００２２】
そして、この取付用軸部２３ａの挿入作業を進行させて、コイルばね２４の他端部２４ａが従動軸１５の他端側に近接すると、この他端部２４ａを従動軸１５のスリット状係止溝１５ｃ内に嵌入し、他端部２４ａをスリット状係止溝１５ｃの軸方向の最も奥部（図２参照）まで移動させて係止する。これにより、コイルばね２４の他端部２４ａを従動軸１５の他端側に固定できる。これと同時に、案内棒２３の嵌合支持面２３ｃの外方側部分をケース１０の固定穴２５に圧入等の手段で固定する。これにより、従動軸１５の他端側を案内棒２３により回転自在に支持できる。
【００２３】
以上のように、コイルばね２４の一端部は、ケース１０に固定されている案内棒２３に連結され、他端部２４ａはケース１０に対して回転自在な従動軸１５に連結されているので、コイルばね２４は従動軸１５の一方向への回転により弾性的に巻き締められ、弾性力が蓄えられる。そして、従動軸１５の一方向への回転力が解放されると、コイルばね２４は自身のばね力により巻き戻されて、従動軸１５を他方向（逆方向）へ回転させることになる。
【００２４】
なお、本実施形態では、コイルばね２４の巻き締め、巻き戻し方向と、吹出モード切換用膜状部材１６の移動方向との関係は次のごとく設定している。すなわち、図１では、吹出モード切換用膜状部材１６の開口部１６ａがデフロスタ開口部１１と連通するデフロスタモードの状態を示しており、▲１▼は吹出モード切換用膜状部材１６がデフロスタモード→フェイスモードへの切換を行う移動方向を示し、▲２▼は逆にフェイスモード→デフロスタモードへの切換を行う移動方向を示している。
【００２５】
そして、吹出モード切換用膜状部材１６の▲１▼方向への移動は、ステップモータ１８の回転力により膜状部材１６の一端側を駆動軸１４に巻き取ることにより行う。このとき、膜状部材１６が▲１▼方向へ移動するに伴って、従動軸１５が回転し、この従動軸１５の回転によりコイルばね２４が弾性変形し、巻き締められるように、コイルばね２４の巻き締め方向を設定している。
【００２６】
これに対し、ステップモータ１８を上記と逆方向に回転して、駆動軸１４を逆方向に回転させ、駆動軸１４から膜状部材１６の一端側を巻き戻す（送り出す）と、コイルばね２４にいままで作用していた巻き締め方向の力が消滅するので、コイルばね２４はそれ自身のばね力により巻き戻る。
その結果、コイルばね２４のばね力により従動軸１５が逆方向に回転して、従動軸１５に膜状部材１６の他端側を巻き取ることができるので、膜状部材１６が▲２▼方向へ移動して、フェイスモード→デフロスタモードへの切換を行う。
【００２７】
なお、ステップモータ１８の制御は図１に示す空調用制御装置２６により行うようになっている。この空調用制御装置２６は例えばマイクロコンピュータとその周辺回路にて構成されるもので、予め設定されたプログラムに従って所定の演算処理を行って、車両用空調装置の電気機器を制御する。
ステップモータ１８は吹出モード切換用膜状部材１６の駆動手段であって、本実施形態では、空調用制御装置２６のマイクロコンピュータにより算出された吹出モード信号もしくは乗員により手動設定された吹出モード信号に基づいてステップモータ１８の回転量（回転角度）および回転方向が制御される。空調用制御装置２６には、周知のごとく車室内の空調に影響する内気温度、外気温、日射量等の環境因子のセンサ群２７および空調制御パネル２８の操作スイッチ群２９からの信号が入力される。
【００２８】
次に、第１実施形態における膜状部材１６と駆動軸１４および従動軸１５との固定構造を図４〜６により説明すると、図４〜６は膜状部材１６と駆動軸１４との固定構造を示しているが、膜状部材１６と従動軸１５との固定構造も全く同一でよい。
軸１４、１５の外周面の軸方向の複数箇所（図示の例では４か所）に凹部３０が等間隔で分割形成してある。この凹部３０は、軸１４、１５の外周面から所定の深さ（高さ）ｈだけ低い部位に位置する平坦面により形成されている。そして、この凹部３０の中央部にはそれぞれ円柱状のピン形状からなる突起部３１が樹脂にて軸１４、１５と一体に突出成形されている。なお、突起部３１の高さは図５に破線図示するように熱かしめの前の状態では軸１４、１５の外周面より外側へ突出する高さを有している。
【００２９】
一方、膜状部材１６の長手方向の両端部には複数（図示の例では４個）の取付片３２が突出成形されており、この取付片３２の幅を凹部３０の軸方向長さＬと同等以下に設定することにより、取付片３２は凹部３０に嵌まり込むようになっている。この取付片３２の中央部にはそれぞれ突起部３１に嵌入し得る径寸法を持った円形の取付孔３３が形成してある。
【００３０】
従って、軸１４、１５の凹部３０の突起部３１に、膜状部材１６の端部の取付片３２の取付孔３３を挿通した後に、樹脂製突起部３１の先端を熱かしめて、取付孔３３より十分大きい外径を持つ拡大頭部３１ａ（図５、６）を形成することにより、この拡大頭部３１ａにて取付片３２を確実に係止できるので、突起部３１により膜状部材１６の端部の取付片３２を軸１４、１５の凹部３０に固定することができる。
【００３１】
そして、突起部３１の高さは、図５に示すように熱かしめ後の状態では、軸１４、１５の外周面より突出しない高さ、すなわち、前述の深さｈに対して同等以下に設定してあるので、突起部３１の存在により軸１４、１５の円形軸形状が阻害されることはない。また、凹部３０を複数に分割形成することにより、この複数の凹部３０相互間に円形軸部３４が形成される。
【００３２】
その結果、膜状部材１６を軸１４、１５に巻き取り、あるいは巻き戻すときに、膜状部材１６の巻き取り、巻き戻し動作をスムースに行うことができる。もし、軸１４、１５の外周面より突起部３１が突出していると、膜状部材１６の巻き取り時にしわが発生して異音発生の原因になるが、本実施形態によると、このような不具合の発生を確実に防止できる。
【００３３】
（第２実施形態）
図７、図８は第２実施形態を示すもので、第１実施形態では凹部３０の中央部に円柱状のピン形状からなる突起部３１を突出成形しているが、第２実施形態では突起部３１を直角状の曲げ係止部３１ｂを有する鉤形状に形成している。この鉤形状の突起部３１の高さは、凹部３０の深さｈより同等以下に形成してある。
【００３４】
第２実施形態によると、軸１４、１５の凹部３０の突起部３１に、膜状部材１６の端部の取付片３２の取付孔３３を挿通することにより、突起部３１を熱かしめしなくても、突起部３１の曲げ係止部３１ｂにより取付孔３３の抜け止めを確実に行うことができるので、突起部３１により膜状部材１６の端部を軸１４、１５の凹部３０に固定することができる。
【００３５】
第２実施形態においても、鉤形状の突起部３１の高さが凹部３０の深さｈより小さくなっているので、突起部３１の存在により軸１４、１５の円形軸形状が阻害されない。そのため、膜状部材１６を軸１４、１５に巻き取り、あるいは巻き戻す動作を第１実施形態と同様にスムースに行うことができる。
（他の実施形態）
▲１▼上記の実施形態では、吹出モード切換用膜状部材１６の駆動機構について本発明を適用しているが、車両用空調装置における、内外気切換用膜状部材、あるいはエアミックス用膜状部材の駆動機構にも本発明を同様に適用できる。
【００３６】
さらには、車両用空調装置に限らず、空気通路開閉装置として種々な用途に本発明は広く適用できるものである。
▲２▼上記の実施形態では、膜状部材１６の駆動用モータとしてステップモータ１８を用いる場合について説明したが、この駆動用モータとして直流モータを用いることもできる。
【００３７】
さらに、上記の実施形態では、膜状部材１６の駆動手段としてモータを用いる場合について説明したが、空調制御パネル２８に備えられて乗員により手動操作されるダイヤル、レバー等の手動操作機構を適宜の連結機構を介して膜状部材１６に連結し、この手動操作機構を膜状部材１６の駆動手段として用いることもできる。
【００３８】
▲３▼上記の実施形態では従動軸１５に連結される弾性手段として、従動軸１５の中空穴１５ａ内に配置されるコイルばね２４を用いているが、コイルばね２４の代わりに、ケース１０の外部に、従動軸１５の外径より大きい外径を有する渦巻き状のぜんまいばねを配置し、このぜんまいばねを弾性手段として用いてもよい。
【図面の簡単な説明】
【図１】本発明の第１実施形態の吹出モード切換装置部分の分解斜視図である。
【図２】図１の断面図である。
【図３】図１、２の要部の分解状態の斜視図である。
【図４】第１実施形態による膜状部材固定構造の分解斜視図である。
【図５】第１実施形態による膜状部材固定構造の組付後の部分断面図である。
【図６】第１実施形態による膜状部材固定構造の組付後の部分断面図である。
【図７】第２実施形態による膜状部材固定構造の分解斜視図である。
【図８】第２実施形態による膜状部材固定構造の組付後の部分断面図である。
【符号の説明】
１０…ケース、１１…デフロスタ開口部、１２…フェイス開口部、
１３…フット開口部、１４…駆動軸（第１の回転軸）、
１５…従動軸（第２の回転軸）、１６…膜状部材、
１８…ステップモータ（駆動手段）、２４…コイルばね（弾性手段）、
３０…凹部、３１…突起部、３２…取付片、３３…取付孔。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air passage opening and closing device that opens and closes an air passage by moving a film-like member (film door) having an opening through which air passes in the air passage. The present invention relates to a structure for fixing to a rotating shaft, and is suitable for use in, for example, a vehicle air conditioner.
[0002]
[Prior art]
Conventionally, in Japanese Patent Laid-Open No. 5-296553, a flat surface extending in the axial direction is formed on a part of the outer peripheral surface of the rotating shaft, and the flat surface and the rotating shaft are separated from a separate holding member. A structure is described in which the end of the film member is fixed to the rotating shaft by sandwiching the end of the film member.
[0003]
[Problems to be solved by the invention]
By the way, according to the above prior art, there is a problem that a separate part called a restraining member is specially required for fixing the film-like member and the rotating shaft, resulting in an increase in cost.
SUMMARY OF THE INVENTION In view of the above, the present invention has an object to fix a membrane member and a rotating shaft with a simple configuration that does not require separate parts.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the invention according to claim 1 , the membrane member (16) having an opening (16a) through which air can circulate is disposed movably in the case (10),
While fixing one end side of the membrane member (16) to the first rotating shaft (14), fixing the other end side of the membrane member (16) to the second rotating shaft (15),
The film-shaped member (16) is wound around the first rotating shaft (14) and the second rotating shaft (15) and unwound to move the opening (16a) of the film-shaped member (16). In the air passage opening and closing device for opening and closing the air passages (11 to 13) of the case (10),
The recesses (30) are divided and formed at a plurality of locations in the axial direction of the outer peripheral surface of the rotating shafts (14, 15), and the protrusions (31) are respectively formed at the recesses (30) at the locations .
And the height of the protrusion (31) is made equal to or less than the depth (h) of the recess (30),
At the end of the film-like member (16), a plurality of attachment pieces (32) that fit into the recesses (30) are formed to protrude,
A plurality of attachment holes (33) are formed in the plurality of attachment pieces (32), and the attachment pieces (32) are locked by the protrusions (31) by inserting the attachment holes (33) into the protrusions (31). And the edge part of a film-form member (16) is fixed to a recessed part (30), It is characterized by the above-mentioned.
Further, in the invention according to claim 2, the membrane member (16) having an opening (16a) through which air can flow is disposed so as to be movable in the case (10),
While fixing one end side of the membrane member (16) to the first rotating shaft (14), fixing the other end side of the membrane member (16) to the second rotating shaft (15),
The film-shaped member (16) is wound around the first rotating shaft (14) and the second rotating shaft (15) and unwound to move the opening (16a) of the film-shaped member (16). In the air passage opening and closing device for opening and closing the air passages (11 to 13) of the case (10),
The recesses (30) are divided and formed at a plurality of locations in the axial direction of the outer peripheral surface of the rotating shafts (14, 15), and the protrusions (31) are respectively molded from the plurality of recesses (30) with a resin,
And the height of the protrusion (31) is made equal to or less than the depth (h) of the recess (30),
At the end of the film-like member (16), a plurality of attachment pieces (32) that fit into the recesses (30) are formed to protrude,
By forming attachment holes (33) in the plurality of attachment pieces (32), and inserting the attachment holes (33) into the protrusions (31), respectively, the protrusions (31) are thermally caulked to form a membrane. The end of the shaped member (16) is fixed to the recess (30).
In the invention according to claim 3, the membrane member (16) having an opening (16a) through which air can flow is disposed so as to be movable in the case (10),
While fixing one end side of the membrane member (16) to the first rotating shaft (14), fixing the other end side of the membrane member (16) to the second rotating shaft (15),
The film-shaped member (16) is wound around the first rotating shaft (14) and the second rotating shaft (15) and unwound to move the opening (16a) of the film-shaped member (16). In the air passage opening and closing device for opening and closing the air passages (11 to 13) of the case (10),
The recesses (30) are dividedly formed at a plurality of positions in the axial direction on the outer peripheral surface of the rotating shaft (14, 15), and the protrusions (31) each have a hook shape for locking at the plurality of recesses (30). Form the
And the height of the protrusion (31) is made equal to or less than the depth (h) of the recess (30),
At the end of the film-like member (16), a plurality of attachment pieces (32) that fit into the recesses (30) are formed to protrude,
Mounting holes (33) are respectively formed in the plurality of mounting pieces (32), and the end portions of the film-like member (16) are recessed by inserting the mounting holes (33) into the hook-shaped protrusions (31). It is characterized by being fixed to (30).
[0005]
According to the first, second, and third aspects of the present invention, the end portion of the film-like member (16) is formed into the concave portion (31) using the protrusion (31) integral with the rotating shaft (14, 15). 30), it is possible to achieve cost reduction by reducing the number of parts without requiring a separate part as a restraining member as in the prior art.
Moreover, since the height of the protrusion (31) is equal to or less than the depth (h) of the recess (30), the protrusion (31) does not protrude from the outer peripheral surface of the rotating shaft (14, 15). Therefore, the circular shaft shape of the rotating shafts (14, 15) is not hindered by the presence of the protrusion (31).
[0006]
As a result, the film member (16) can be smoothly wound and unwound on the rotating shafts (14, 15), so that the protrusion of the protrusion (31) causes the film member (16) to move. It is possible to avoid the occurrence of wrinkles during winding, and it is possible to reliably prevent problems such as the generation of abnormal noise due to the wrinkles.
Moreover, in invention of Claim 1, 2, 3, the recessed part (30) is divided and formed in multiple places in the axial direction of the outer peripheral surface of a rotating shaft (14, 15), and the edge part of a film-form member (16) A plurality of attachment pieces (32) that fit into the recesses (30) are formed so as to protrude, and attachment holes (33) are formed in the attachment pieces (32).
According to this, since the circular shaft portion (34) can be formed between the plurality of concave portions (30) on the rotating shaft side, the rotating shaft (14) of the film-like member (16) is formed using the circular shaft portion (34) as a guide. 15) can be more smoothly performed.
In the invention of claim 2, as described above , the protrusion (31) is formed of the resin on the rotating shaft (14, 15), and the end of the film-like member (16) is formed on the protrusion (31). After the insertion hole (33) is inserted, the protrusion (31) is heat caulked to fix the end of the membrane member (16) to the recess (30) .
[0007]
According to this, the end part of the film-like member (16) can be reliably fixed by a simple process of heat caulking the resin protrusion (31) integrally formed on the rotating shaft (14, 15).
In the invention of claim 3, as described above, the protrusion (31) has a hooked hook shape, and the end of the membrane member (16) is attached to the hook-shaped protrusion (31). By inserting the hole (33), the end of the membrane member (16) is fixed to the recess (30) .
[0008]
According to this, only by inserting the mounting hole (33) at the end of the film-like member (16) into the protrusion (31) using the hook shape of the protrusion (31), heat caulking or the like is required. In addition, the end of the membrane member (16) can be more reliably fixed more easily .
[0009]
In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means of embodiment description later mentioned.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1 to 6 show a first embodiment in which the present invention is applied to a vehicle air conditioner. The vehicle air conditioner in the present embodiment has a resin case 10, and this case 10 is It forms an air passage of an air conditioner, and is installed, for example, in the center of the vehicle interior instrument panel in the vehicle width (left and right) direction.
[0011]
Then, blown air from a blower unit (not shown) flows into the case 10, and heat exchange such as an evaporator (cooling heat exchanger) and a heater core (heating heat exchanger) (not shown) in the case 10 is performed. After the heat is exchanged with the vessel and the temperature is adjusted, air is blown out from the plurality of blowing openings 11 to 13 provided at the air downstream end of the case 10 toward a predetermined place in the vehicle interior.
[0012]
Specifically, the blowout opening includes a defroster opening 11 for blowing conditioned air toward the inner surface of the vehicle interior windshield, a face opening 12 for blowing conditioned air toward the passenger's upper body, and conditioned air. A foot opening 13 that blows out toward the foot of the passenger is provided.
A drive shaft (first rotation shaft) 14 and a driven shaft (second rotation shaft) 15 are supported in the case 10 so as to be rotatable with respect to the case 10. The drive shaft 14 and the driven shaft 15 include a flexible member, specifically, a blowing mode switching film member 16 made of a resin film member having excellent flexibility and strength such as polyethylene resin. Both ends are fixed and wound. The blowing mode switching membrane member 16 is formed with a plurality of openings 16a for allowing air to pass therethrough.
[0013]
As shown in FIG. 1, an intermediate guide shaft 17 is disposed at an intermediate portion between the drive shaft 14 and the driven shaft 15, and the intermediate guide shaft 17 switches the blowing mode along the inner wall surface of the case 10. The membrane member 16 is bent to guide the movement of the blowing mode switching membrane member 16. The intermediate guide shaft 17 may be configured to be rotatable to facilitate the movement of the blowing mode switching film-like member 16, but in this example, the intermediate guide shaft 17 is fixed to the resin case 10. As a non-rotatable configuration, the cost is reduced.
[0014]
The blowing mode switching film-like member 16 is given a constant tension by the drive shaft 14, the intermediate guide shaft 17 and the driven shaft 15 so as to face the air upstream side wall surfaces of the respective blowing openings 11 to 13. It is provided in an attached state and moves along this wall surface.
The drive shaft 14 is rotationally driven by a step motor (drive means) 18 shown in FIG. The blowing mode switching film-like member 16 is rotated by rotating the drive shaft 14 in both forward and reverse directions by the step motor 18 to stop the film-like member 16 (that is, the opening 16a) at an arbitrary position. The blowing mode is switched by switching communication between 16a and the respective blowing openings 11 to 13 and blocking.
[0015]
Next, a specific configuration of the drive mechanism of the blowing mode switching film-like member 16 will be described in detail. Both the drive shaft 14 and the driven shaft 15 are made of resin, and both ends of the blowing mode switching film member 16 are fixed to the shafts 14 and 15 by means described later according to the present invention.
As shown in FIG. 2, the drive shaft 14 has a normal shaft shape having no hollow portion. A small-diameter shaft portion 14 a is formed at one end of the drive shaft 14, and the small-diameter shaft portion 14 a is rotatably supported in the bearing hole 19 of the case 10. A connecting hole 14b having a D-shaped cross section is formed in the other end portion of the drive shaft 14, and an insertion portion 20a having a D-shaped cross section of a resin shaft pressing member (bush) 20 is inserted into the connecting hole 14b. Then, the shaft pressing member 20 and the drive shaft 14 are integrally connected to the rotation direction.
[0016]
The shaft portion 20 b of the shaft pressing member 20 is rotatably fitted in and supported in the bearing hole 21 of the case 10. That is, by assembling the shaft pressing member 20 to the drive shaft 14 and the case 10, the other end side of the drive shaft 14 is rotatably supported by the bearing hole 21 via the shaft pressing member 20.
The shaft pressing member 20 has a circular main body portion 20c disposed outside the case 10, and the insertion portion 20a and the shaft portion 20b described above are integrally formed with the main body portion 20c with resin.
[0017]
An output shaft 18 a of the step motor 18 is connected to the main body portion 20 c disposed outside the case 10 in the shaft pressing member 20. As described above, the rotation of the step motor 18 is transmitted to the drive shaft 14 via the shaft pressing member 20 so that the drive shaft 14 rotates.
On the other hand, the driven shaft 15 is formed in a hollow shape (cylindrical shape) having an axial hollow hole 15a at the center thereof. A small-diameter shaft portion 15 b is formed at one end of the driven shaft 15, and the small-diameter shaft portion 15 b is rotatably supported in the bearing hole 22 of the case 10. The hollow hole 15a is closed on one end side of the driven shaft 15, and the other end side (left end portion in FIG. 2) is open to the outside.
[0018]
A resin guide rod 23 is inserted into the hollow hole 15 a of the driven shaft 15. The guide rod 23 has a spring mounting shaft portion 23a. A coil spring (elastic means) 24 is disposed between the spring mounting shaft portion 23a and the inner peripheral surface of the hollow hole 15a of the driven shaft 15. The guide rod 23 is formed with the smallest diameter so as to form a possible gap.
[0019]
The coil spring 24 is wound around the outer peripheral surface of the mounting shaft portion 23a, and one end portion thereof (the right end portion in FIG. 2) is fitted and locked into the locking groove 23b at the tip of the mounting shaft portion 23a. One end of 24 is fixed to the tip of the mounting shaft 23a. Further, in the guide rod 23, a fitting support surface 23c having an outer diameter larger than the mounting shaft portion 23a by a predetermined amount is formed on the base side of the mounting shaft portion 23a. The fitting support surface 23c has a predetermined length. It is fitted to the inner peripheral surface of the driven shaft 15 and the other end side of the driven shaft 15 is rotatably supported by the guide rod 23 at this fitting length.
[0020]
In addition, a slit-like locking groove 15c extending in the axial direction over a predetermined length is formed on the other end side of the driven shaft 15. The other end portion 24a of the coil spring 24 is bent radially outward from the outer peripheral surface of the mounting shaft portion 23a, and the other end portion (arm portion) 24a is fitted and locked in the locking groove 15c. It is like that. Further, the outer portion of the fitting support surface 23 c of the guide rod 23 is fitted and fixed to the fixing hole 25 of the case 10 by means such as press fitting.
[0021]
Next, a method of assembling the guide rod 23 and the coil spring 24 will be described. The coil spring 24 is wound around the mounting shaft portion 23a of the guide rod 23, and the coil spring is wound around the locking groove 23b at the tip of the mounting shaft portion 23a. One end of 24 is fixed. On the other hand, the other end 24a of the coil spring 24 is bent outward in the radial direction. Next, the mounting shaft portion 23 a of the guide rod 23 is inserted into the hollow hole 15 a of the driven shaft 15 through the fixing hole 25 of the case 10.
[0022]
Then, when the insertion operation of the mounting shaft portion 23a is advanced so that the other end portion 24a of the coil spring 24 comes close to the other end side of the driven shaft 15, the other end portion 24a is engaged with the slit of the driven shaft 15. It fits into the groove 15c, and the other end 24a is moved and locked to the innermost part (see FIG. 2) in the axial direction of the slit-like locking groove 15c. As a result, the other end 24 a of the coil spring 24 can be fixed to the other end of the driven shaft 15. At the same time, the outer side portion of the fitting support surface 23c of the guide rod 23 is fixed to the fixing hole 25 of the case 10 by means such as press fitting. Thereby, the other end side of the driven shaft 15 can be rotatably supported by the guide rod 23.
[0023]
As described above, one end of the coil spring 24 is connected to the guide rod 23 fixed to the case 10, and the other end 24a is connected to the driven shaft 15 that is rotatable with respect to the case 10. The coil spring 24 is elastically wound by rotation of the driven shaft 15 in one direction, and an elastic force is stored. When the rotational force in one direction of the driven shaft 15 is released, the coil spring 24 is rewound by its own spring force and rotates the driven shaft 15 in the other direction (reverse direction).
[0024]
In the present embodiment, the relationship between the winding and unwinding directions of the coil spring 24 and the moving direction of the blowing mode switching membrane member 16 is set as follows. That is, FIG. 1 shows a state of the defroster mode in which the opening 16a of the blowing mode switching film-shaped member 16 communicates with the defroster opening 11, and (1) indicates that the blowing mode switching film-shaped member 16 is in the defroster mode. → Indicates the moving direction for switching to the face mode, and (2) indicates the moving direction for switching to the face mode → defroster mode.
[0025]
The film mode member 16 for blowing mode switching is moved in the direction (1) by winding one end side of the film member 16 around the drive shaft 14 by the rotational force of the step motor 18. At this time, as the membrane member 16 moves in the direction (1), the driven shaft 15 rotates, and the coil spring 24 is elastically deformed by the rotation of the driven shaft 15 so that the coil spring 24 is tightened. The direction of tightening is set.
[0026]
On the other hand, when the step motor 18 is rotated in the opposite direction, the drive shaft 14 is rotated in the opposite direction, and one end side of the film-like member 16 is rewound (sent out) from the drive shaft 14, the coil spring 24 is turned on. Since the force in the tightening direction that has been acting so far disappears, the coil spring 24 is wound back by its own spring force.
As a result, the driven shaft 15 rotates in the reverse direction by the spring force of the coil spring 24 and the other end side of the film-shaped member 16 can be wound around the driven shaft 15, so that the film-shaped member 16 is in the (2) direction. To switch from face mode to defroster mode.
[0027]
The step motor 18 is controlled by the air conditioning controller 26 shown in FIG. The air-conditioning control device 26 is composed of, for example, a microcomputer and its peripheral circuits, and performs predetermined arithmetic processing according to a preset program to control the electrical equipment of the vehicle air-conditioning device.
The step motor 18 is a driving means for the blowing mode switching membrane member 16. In this embodiment, the step motor 18 generates a blowing mode signal calculated by the microcomputer of the air conditioning control device 26 or a blowing mode signal manually set by the occupant. Based on this, the rotation amount (rotation angle) and rotation direction of the step motor 18 are controlled. As is well known, the air conditioning control unit 26 receives signals from the sensor group 27 of environmental factors such as the inside air temperature, the outside air temperature, the amount of solar radiation and the operation switch group 29 of the air conditioning control panel 28 that affect the air conditioning in the passenger compartment. The
[0028]
Next, the fixing structure of the film-like member 16 and the drive shaft 14 and the driven shaft 15 in the first embodiment will be described with reference to FIGS. 4 to 6. FIGS. 4 to 6 show the fixing structure of the film-like member 16 and the drive shaft 14. However, the fixing structure of the membrane member 16 and the driven shaft 15 may be exactly the same.
Concave portions 30 are divided and formed at equal intervals at a plurality of locations (four locations in the illustrated example) in the axial direction on the outer peripheral surfaces of the shafts 14 and 15. The recess 30 is formed by a flat surface located at a portion lower than the outer peripheral surfaces of the shafts 14 and 15 by a predetermined depth (height) h. And the protrusion part 31 which consists of a column-shaped pin shape at the center part of this recessed part 30 is integrally protrudingly molded with the shafts 14 and 15 with resin. The protrusion 31 has a height that protrudes outward from the outer peripheral surfaces of the shafts 14 and 15 in a state before heat caulking, as shown by a broken line in FIG.
[0029]
On the other hand, a plurality of (four in the illustrated example) attachment pieces 32 are formed to protrude at both ends in the longitudinal direction of the film-like member 16, and the width of the attachment pieces 32 is set to the axial length L of the recess 30. By setting it to be equal or less, the mounting piece 32 is fitted into the recess 30. A circular attachment hole 33 having a diameter that can be fitted into the protrusion 31 is formed at the center of the attachment piece 32.
[0030]
Therefore, after inserting the attachment hole 33 of the attachment piece 32 at the end of the film-like member 16 into the protrusion 31 of the concave portion 30 of the shafts 14 and 15, the tip of the resin protrusion 31 is heat-cured to attach the attachment hole 33. By forming the enlarged head 31a (FIGS. 5 and 6) having a sufficiently large outer diameter, the attachment piece 32 can be reliably locked by the enlarged head 31a. The end mounting piece 32 can be fixed to the recess 30 of the shafts 14 and 15.
[0031]
Then, the height of the protrusion 31 is set equal to or less than the height that does not protrude from the outer peripheral surfaces of the shafts 14 and 15 in the state after heat caulking as shown in FIG. Therefore, the presence of the protrusion 31 does not hinder the circular shaft shape of the shafts 14 and 15. Moreover, the circular shaft part 34 is formed between these recessed parts 30 by dividing and forming the recessed part 30 into several.
[0032]
As a result, when the film-like member 16 is wound around the shafts 14 and 15, the film-like member 16 can be smoothly wound and unwound. If the protrusion 31 protrudes from the outer peripheral surfaces of the shafts 14 and 15, wrinkles are generated when the film-like member 16 is wound up, and abnormal noise is generated. According to this embodiment, The occurrence of defects can be reliably prevented.
[0033]
(Second Embodiment)
7 and 8 show the second embodiment. In the first embodiment, a projection 31 made of a cylindrical pin shape is projected and formed at the center of the recess 30. In the second embodiment, the projection is shown in FIG. The portion 31 is formed in a bowl shape having a right-angled bending locking portion 31b. The height of the hook-shaped protrusion 31 is equal to or less than the depth h of the recess 30.
[0034]
According to the second embodiment, by inserting the attachment hole 33 of the attachment piece 32 at the end of the film-like member 16 into the protrusion 31 of the recess 30 of the shafts 14 and 15, the protrusion 31 does not heat In addition, since the mounting hole 33 can be reliably prevented from coming off by the bending locking portion 31 b of the protruding portion 31, the end portion of the film-like member 16 is fixed to the recessed portion 30 of the shafts 14 and 15 by the protruding portion 31. Can do.
[0035]
Also in the second embodiment, since the height of the hook-shaped protrusion 31 is smaller than the depth h of the recess 30, the circular shaft shape of the shafts 14 and 15 is not hindered by the presence of the protrusion 31. Therefore, the operation of winding the film-like member 16 around the shafts 14 and 15 or rewinding it can be performed smoothly as in the first embodiment.
(Other embodiments)
(1) In the above embodiment, the present invention is applied to the drive mechanism of the blowing mode switching film-like member 16, but the inside / outside air switching film-like member or the air-mixing film-like member in the vehicle air conditioner The present invention can be similarly applied to a drive mechanism for members.
[0036]
Further, the present invention can be widely applied to various uses as an air passage opening / closing device, not limited to a vehicle air conditioner.
{Circle around (2)} In the above embodiment, the case where the step motor 18 is used as the driving motor for the film-like member 16 has been described. However, a DC motor can also be used as the driving motor.
[0037]
Furthermore, in the above-described embodiment, the case where a motor is used as the driving means for the film-like member 16 has been described. It is also possible to connect to the film member 16 via a connection mechanism, and to use this manual operation mechanism as a driving means for the film member 16.
[0038]
(3) In the above embodiment, the coil spring 24 arranged in the hollow hole 15a of the driven shaft 15 is used as the elastic means connected to the driven shaft 15. However, instead of the coil spring 24, the case 10 A spiral spring having an outer diameter larger than the outer diameter of the driven shaft 15 may be disposed outside, and this spring may be used as an elastic means.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a blowing mode switching device portion according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of FIG.
FIG. 3 is a perspective view of an essential state of FIGS.
FIG. 4 is an exploded perspective view of the membranous member fixing structure according to the first embodiment.
FIG. 5 is a partial cross-sectional view after assembly of the membranous member fixing structure according to the first embodiment.
FIG. 6 is a partial cross-sectional view after assembly of the membranous member fixing structure according to the first embodiment.
FIG. 7 is an exploded perspective view of a membranous member fixing structure according to a second embodiment.
FIG. 8 is a partial cross-sectional view after assembling the membranous member fixing structure according to the second embodiment.
[Explanation of symbols]
10 ... Case, 11 ... Defroster opening, 12 ... Face opening,
13 ... foot opening, 14 ... drive shaft (first rotating shaft),
15 ... driven shaft (second rotating shaft), 16 ... membrane member,
18 ... step motor (drive means), 24 ... coil spring (elastic means),
30 ... concave portion, 31 ... projection, 32 ... mounting piece, 33 ... mounting hole.

Claims

A membrane member (16) having an opening (16a) through which air can flow is disposed so as to be movable in the case (10),
While fixing one end side of the film-like member (16) to the first rotating shaft (14), fixing the other end side of the film-like member (16) to the second rotating shaft (15),
The film member (16) is wound around the first rotating shaft (14) and the second rotating shaft (15) and rewound, whereby the opening (16a) of the film member (16). ) Is moved to open and close the air passages (11 to 13) of the case (10).
The recesses (30) are divided and formed at a plurality of locations in the axial direction of the outer peripheral surface of the rotating shafts (14, 15), and the protrusions (31) are respectively formed at the recesses (30) at the locations .
And the height of the protrusion (31) is made equal to or less than the depth (h) of the recess (30),
At the end of the membrane member (16), a plurality of attachment pieces (32) that fit into the recess (30) are formed to protrude ,
A plurality of attachment holes (33) are formed in the plurality of attachment pieces (32), and the attachment pieces (32) are inserted into the protrusions (31) by inserting the attachment holes (33) into the protrusions (31). The air passage opening and closing device, wherein the air passage opening and closing device is locked with the end portion of the membrane member (16) and fixed to the recess (30).

A membrane member (16) having an opening (16a) through which air can flow is disposed so as to be movable in the case (10),
While fixing one end side of the film-like member (16) to the first rotating shaft (14), fixing the other end side of the film-like member (16) to the second rotating shaft (15),
The film member (16) is wound around the first rotating shaft (14) and the second rotating shaft (15) and rewound, whereby the opening (16a) of the film member (16). ) Is moved to open and close the air passages (11 to 13) of the case (10).
The recesses (30) are divided and formed at a plurality of axial positions on the outer peripheral surface of the rotating shaft (14, 15), and the protrusions (31) are molded from the resin at the plurality of recesses (30), respectively .
And the height of the protrusion (31) is made equal to or less than the depth (h) of the recess (30),
At the end of the membrane member (16), a plurality of attachment pieces (32) that fit into the recess (30) are formed to protrude,
By forming attachment holes (33) in the plurality of attachment pieces (32) and inserting the attachment holes (33) into the protrusions (31), respectively, the protrusions (31) are heat-caulked. , an air passage switching device, characterized in that to fix the end of the film member (16) in the recess (30).

A membrane member (16) having an opening (16a) through which air can flow is disposed so as to be movable in the case (10),
While fixing one end side of the film-like member (16) to the first rotating shaft (14), fixing the other end side of the film-like member (16) to the second rotating shaft (15),
The film member (16) is wound around the first rotating shaft (14) and the second rotating shaft (15) and rewound, whereby the opening (16a) of the film member (16). ) Is moved to open and close the air passages (11 to 13) of the case (10).
With split form recesses (30) at a plurality of positions in the axial direction of the outer peripheral surface of said rotary shaft (14, 15), projections (31 having a hook shape for respectively locking the recess (30) of the plurality of locations )
And the height of the protrusion (31) is made equal to or less than the depth (h) of the recess (30),
At the end of the membrane member (16), a plurality of attachment pieces (32) that fit into the recess (30) are formed to protrude,
An attachment hole (33) is formed in each of the plurality of attachment pieces (32), and the attachment hole (33) is inserted into the hook-shaped protrusion (31) to thereby end the membrane member (16). Is fixed to the recess (30).