JP4275961B2

JP4275961B2 - Reclining device

Info

Publication number: JP4275961B2
Application number: JP2003032220A
Authority: JP
Inventors: 誠克増田
Original assignee: Imasen Electric Industrial Co Ltd
Current assignee: Imasen Electric Industrial Co Ltd
Priority date: 2003-02-10
Filing date: 2003-02-10
Publication date: 2009-06-10
Anticipated expiration: 2023-02-10
Also published as: JP2004237019A

Description

【０００１】
【発明の属する技術分野】
本発明は、遊星ギヤを用いる減速機を用いて無段階にシートバックの傾斜角度を調整し得る車両シート用のリクライニング装置に関するものである。
【０００２】
【従来の技術】
一般に、自動車等の車両の運転席、助手席（前部座席）にはシートバックの傾斜角度を調整、固定するためのリクライニング装置が取り付けられている。このリクライニング装置は、例えば乗員が着座してシートバックに背中を押し当てた状態でシートバックの傾斜角度を任意の位置に調節したり、或いは、２ドア車における後部座席への乗降に際し、前部座席に乗員がいない状態でシートバックを最前位置まで前倒する等の操作が行われるようになっている。
【０００３】
このリクライニング装置には、ラッチ機構を用いて段階的にシートバックの傾斜角度を調整する有段調整式と、無段階調整式とがある。無段階調整式では、一般的に遊星歯車減速機またはこの変形機構（例えば、偏心軸と歯数の異なるギアを用いたタウメル機構）を採用し、シートバックの傾斜角度を無段式に調整できるようにしてる。遊星歯車減速機は、特に電動モータで駆動するパワー式リクライニング装置に多く用いられている。
【０００４】
遊星歯車減速機は、歯数の異なる歯車を同時に噛合させるため加工精度によらず本来的にガタがあり、また、加工精度及び熱処理ひずみによってもガタが生じ易い。さらには、ガタつきを抑えるように精密に加工すると、実際の組み付けができなくなることがある。このため、遊星歯車減速機を用いるリクライニング装置にはガタつきがついて回り、ガタつきを抑えるため、例えば、特許文献１〜６が提案されている。
【０００５】
特許文献１には、太陽歯車の歯面を傾斜させ、付勢手段（円錐／軸方向のバネ）により遊星歯車をアッパー／ロアギアに押圧することが開示されている。特許文献２には、クリスフォーム（１２）に若干のクリアランスを設けてスプリングリングプレート（２０）を配設し、スプリングリングプレート（２０）でプラネタリーギア（８）を押圧することが開示されている。特許文献３には、プラネタリーギアをリングギアへ弾撥的に付勢することが開示されている。特許文献４には、遊星歯車を放射状に付勢する折り曲げ／切り離し部を有する線状バネ材で保持する構成が開示されている。一方、特許文献５、特許文献６には、遊星歯車機構の変形機構（偏心軸と歯数の異なるギアを用いたタウルメ機構）において、偏心軸部にくさびセグメントを備え、遊び、ガタを防止する構成が開示されている。
【０００６】
【特許文献１】
特開平6-277128号公報
【特許文献２】
特公平8-4539号公報
【特許文献３】
実公平8-3312号公報
【特許文献４】
実用新案登録第2508237号
【特許文献５】
特公昭63-47443号公報
【特許文献６】
特開2001-211950号公報
【０００７】
【発明が解決しようとする課題】
シートバックの最大傾斜角度は車種等により様々である。このため、リクライニング装置は、シートバックの作動角度が異なるシートに対して、それぞれ作動角度を設定する部材を用いて対応していた。従って、部品のコストが嵩むと共に、部品組み付けのための作業が別途必要となった。
【０００８】
更に、特許文献１〜４では、遊星歯車を２つの大きな内歯側にバネ等によって付勢しているが、２つの大きな内歯は、歯数が異なり、同一の歯形ではないため、遊星歯車をこれらに押し付けても、理論上２つの大きな内歯と遊星歯車との間のガタつきを無くすことはできない。これに加えて、加工精度によってもガタが生じることは避け得なかった。特許文献５、６は、偏心軸部を採用しているため、操作時に揺動回転するという基本的な問題点があった。
【０００９】
請求項１、請求項２の発明は、上述した課題を解決するためになされたものであり、その目的とするところは、特別な部材を用いることなくリクライニング動作角度を複数種類設定し得るリクライニング装置を提供することにある。
【００１０】
また、請求項３〜請求項５の目的は、停止状態でのバックラッシュを無くしたリクライニング装置を提供することを目的とする。
【００１１】
【課題を解決するための手段、および発明の作用・効果】
上記課題を解決するため請求項１の発明は、シートクッション側及びシートバック側の何れか一方に固定される第１内歯と、
シートクッション側及びシートバック側の他方に固定され、前記第１内歯に対して回動可能に対向配置される第２内歯と、
前記第１内歯及び前記第２内歯と噛合する歯車とからなる減速機を用いるリクライニング装置であって、
前記第１内歯の内周縁に第２内歯側へ突出する第１規制部、第２規制部、第３規制部をそれぞれ間隔を異ならしめ設け、
前記第２内歯の外周に外周側に突出する当接部を設け、該当接部を前記第１規制部と前記第２規制部との間、前記第２規制部と前記第３規制部との間、又は、前記第３規制部と前記第１規制部との間に来るよう配置して、当該第２内歯が回転した際に該当接部が第１規制部又は第２規制部に当接、第２規制部又は第３規制部に当接、或いは、第３規制部又は第１規制部に当接することで、第２内歯の回転角度をそれぞれ規制するよう構成したことを技術的特徴とする。
【００１２】
請求項１のリクライニング装置では、第１内歯の内周縁に第２内歯側へ突出する第１規制部、第２規制部、第３規制部をそれぞれ間隔を異ならしめ設け、第２内歯の外周に外周側に突出する当接部を設ける。そして、当接部を第１規制部と第２規制部との間に来るように第１内歯を第２内歯に対して組み付けることで、第１規制部と第２規制部との間隔に応じたリクライニング動作角度を設定できる。同様に、当接部を第２規制部と第３規制部との間に来るように第１内歯を第２内歯に対して組み付けることで、第２規制部と第３規制部との間隔に応じたリクライニング動作角度を設定できる。また、第３規制部と第１規制部との間に来るように第１内歯を第２内歯に対して組み付けることで、第３規制部と第１規制部との間隔に応じたリクライニング動作角度を設定できる。この様に、第２内歯を第１内歯に組み付ける位置を変えることで、特別な部材を用いることなくリクライニング動作角度を３種類設定することができる。
【００１３】
請求項２の発明では、シートクッション側及びシートバック側の何れか一方に固定される第１内歯と、
シートクッション側及びシートバック側の他方に固定され、前記第１内歯に対して回動可能に対向配置される第２内歯と、
前記第１内歯及び前記第２内歯と噛合する歯車とからなる減速機を用いるリクライニング装置であって、
前記第１内歯の内周縁に第２内歯側へ突出する第１規制部、第２規制部を、第１規制部の一方の端部から第２規制部の一方の端部までと、第１規制部の他方の端部から第２規制部の他方の端部までとの間隔を異ならしめ設け、
前記第２内歯の外周に外周側に突出する当接部を設け、該当接部を前記第１規制部の前記一方の端部と前記第２規制部の一方の端部との間、又は、前記第１規制部の他方の端部と前記第２規制部の他方の端部との間に来るよう配置して、当該第２内歯が回転した際に該当接部が第１規制部の一方の端部又は第２規制部の一方の端部に当接、或いは、第１規制部の他方の端部又は第２規制部の他方の端部に当接することで、第２内歯の回転角度をそれぞれ規制するよう構成したことを技術的特徴とする。
【００１４】
請求項２のリクライニング装置では、第１内歯の内周縁に第２内歯側へ突出する第１規制部、第２規制部を、第１規制部の一方の端部から第２規制部の一方の端部までと、第１規制部の他方の端部から第２規制部の他方の端部までとの間隔を異ならしめ設け、第２内歯の外周に外周側に突出する当接部を設ける。そして、当接部を第１規制部の一方の端部と第２規制部の一方の端部との間に来るように第１内歯を第２内歯に対して組み付けることで、第１規制部の一方の端部と第２規制部の一方の端部との間隔に応じたリクライニング動作角度を設定できる。同様に、当接部を第１規制部の他方の端部と第２規制部の他方の端部との間に来るように第１内歯を第２内歯に対して組み付けることで、第１規制部の他方の端部と第２規制部の他方の端部との間隔に応じたリクライニング動作角度を設定できる。この様に、第２内歯を第１内歯に組み付ける位置を変えることで、特別な部材を用いることなくリクライニング動作角度を２種類設定することができる。
【００１５】
請求項３の減速機では、偏位手段により遊星歯車の内の半数以上を外周側へ偏位させるため、複数の遊星歯車と第１内歯、第２内歯とが強固に噛合し、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００１６】
請求項４の減速機では、保持部材により３個の遊星歯車の内の２個を連動させ残り１個の遊星歯車と反対方向へ偏位させる。該２個の遊星歯車は、それぞれの遊星歯車の中心と軸の中心とを結ぶ線分から外れた方向に偏位させられ、それぞれ自転方向へのモーメントが加わり、互いに近づく公転方向へ移動しようとする。しかし、太陽歯車と噛合しており、且つ、保持部材により公転方向への移動が規制させられるため、２個の遊星歯車は第１内歯、第２内歯と強固に噛合する。これにより、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００１７】
好適には、保持部材は、軸に枢支され太陽歯車と共に２個の遊星歯車を第１内歯及び第２内歯に対して偏位させる。即ち、保持部材は、該２個の遊星歯車と共に太陽歯車を残り１個の遊星歯車と反対方向へ偏位させる。太陽歯車が残り１個の遊星歯車と反対方向へ偏位するため（即ち、相互に回転モーメントを発生させない方向へ偏位するため）、該太陽歯車と該１個の遊星歯車との間で抵抗が生じず、円滑に２個の遊星歯車を偏位させることができる。また、該太陽歯車が共に該２個の遊星歯車と偏位するため、太陽歯車と２個の遊星歯車との間でがたつきが生じない。
【００１８】
好適には、第１内歯又は第２内歯の中央位置に形成された通孔の内周と偏心カムの外周との間を摺動する１対の楔部材がスプリングにより離れる方向へ付勢されることで、保持部材は、遊星歯車内の２個を残り１個の遊星歯車と反対方向へ偏位させる。これにより、該２個の遊星歯車と第１内歯、第２内歯とが強固に噛合し、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００１９】
好適には、保持部材は遊星歯車と第１内歯との間に配置される第１支持板と、遊星歯車と第２内歯との間に配置される第２支持板とからなり、第１支持板は第１内歯側へ突出する偏心カムを、第２支持板は第２内歯側へ突出する偏心カムを備える。第１の内歯及び第２の内歯の中央位置に形成された通孔の内周と偏心カムの外周との間を摺動するそれぞれ１対の楔部材が、それぞれスプリングにより離れる方向へ付勢されることで、第１支持板及び第２支持板は、遊星歯車内の２個を残り１個の遊星歯車と反対方向へそれぞれ偏位させる。このため、第１内歯と２個の遊星歯車との間にがたつき（クリアランス）がある場合には、主として第１支持板が両者のがたを取り、第２内歯と２個の遊星歯車との間にがたつき（クリアランス）がある場合には、主として第２支持板が両者のがたを取るため、第１内歯、第２内歯のいずれの側にがたつき（クリアランス）があっても、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００２０】
請求項５では、第１内歯及び第２内歯に噛合する２個の遊星歯車と、前記遊星歯車と噛合する太陽歯車と、前記太陽歯車を駆動する軸とからなる遊星歯車機構の減速機であって、前記２個の遊星歯車の一方を外周側へ偏位させる偏位手段を備える。一方の遊星歯車は第１内歯、第２内歯と強固に噛合するため、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００２１】
【発明の実施の形態】
以下、本発明の実施形態について図を参照して説明する。
[第１実施形態]
図１は、本発明の第１実施形態に係るリクライニング装置５０を取り付けたシートを示すもので、シート８０は、シートバック６０とシートクッション７０とから成る。リクライニング装置５０は、後述する遊星歯車式の減速機１０と、減速機の第１内歯側１２側に固定されたブラケット７２と、第２内歯１４側に固定されたブラケット６２とからなる。ブラケット６２はシートクッション７０に固定され、ブラケット７２はシートクッション７０側に固定されている。リクライニング装置５０は、図示しないスイッチが操作されるとブラケット６２とブラケット７２との相対回転角度、即ち、シートバック６０のシートクッション７０に対する角度を調整するよう構成されている。
【００２２】
図２（Ａ）は図１中に示す減速機１０の斜視図であり、図２（Ｂ）は側面図であり、図３（Ａ）は減速機１０の正面図であり、図３（Ｂ）はカバー３６を外した状態の減速機の正面図であり、図４は図３（Ｂ）に示す減速機のＡ−Ａ断面図であり、図５は減速機の構成部品の組図である。
図４及び図５に示すように減速機１０は、図１に示すシートクッション７０側にブラケット７２を介して接続される第１内歯１２と、シートバック６０側にブラケット６２を介して接続される第２内歯１４とを備える。第１内歯１２の歯数は例えば３３に、第２内歯１４の歯数は例えば３６に形成されている。ここで、３個の遊星歯車を用いる場合、第１内歯１２と第２内歯１４との歯数の差は３の倍数になる。第１内歯１２及び第２内歯１４の外側にはカバー３６が取り付けられる。第１内歯１２及び第２内歯１４の内側には、太陽歯車３０と太陽歯車の回りに３個の遊星歯車３２Ａ、３２Ｂ、３２Ｃが配設される。
【００２３】
第１内歯１２の内周縁には、第２内歯１４側へ突出する第１規制部１２ｂ、第２規制部１２ｃ、第３規制部１３ｂがそれぞれ間隔を異ならしめ設けられている。即ち、図１中に示すように、第１規制部１２ｂと第２規制部１２ｃとの間の角度α１が１１０°、第２規制部１２ｃと第３規制部１２ｄとの間の角度α２が９０°、第３規制部１２ｄと第１規制部１２ｂとの間の角度α３が７０°となるように設定されている。一方、第２内歯１４の外周には、外周側（軸心と直角方向）に突出する当接部１４ｂが設けられている。
【００２４】
ここで、図１、及び、この組み立て状態を示す図１０のように、第２内歯１４の当接部１４ｂを第１規制部１２ｂと第２規制部１２ｃとの間に来るように第２内歯１４を第１内歯１２に対して組み付けることで、第１規制部１２ｂと第２規制部１２ｃとの角度α１（１１０°）に応じたリクライニング動作角度（具体的には、１１０°から当接部１４ｂの長さ分（２０°）を引いた９０°）を設定できる。同様に、図１１に示すように、当接部１４ｂを第２規制部１２ｃと第３規制部１２ｄとの間に来るように第２内歯１４を第１内歯１２に対して組み付けることで、第２規制部１２ｃと第３規制部１２ｄとの角度α２（９０°）に応じたリクライニング動作角度（具体的には、９０°から当接部１４ｂの長さ分（２０°）を引いた７０°）を設定できる。更に、図１２に示すように当接部１２ｂを第３規制部１２ｄと第１規制部１２ｂとの間に来るように第２内歯１４を第１内歯１２に対して組み付けることで、第３規制部１２ｄと第１規制部１２ｂとの角度α３（７０°）に応じたリクライニング動作角度（具体的には、７０°から当接部１４ｂの長さ分（２０°）を引いた５０°）を設定できる。この様に、第２内歯１４を第１内歯１２に組み付ける位置を変えることで、特別な部材を用いることなくリクライニング動作角度を３種類（９０°、７０°、５０°）設定することができる。
【００２５】
再び、図５を参照し説明を続ける。遊星歯車３２Ａ、３２Ｂ、３２Ｃと第１内歯１２との間には、遊星歯車３２Ａ、３２Ｂを保持する第１支持板２２が、該遊星歯車３２Ａ、３２Ｂ、３２Ｃと第２内歯１４との間には、遊星歯車３２Ａ、３２Ｂを保持する第２支持板２４が配設される。第１支持板２２には、第１内歯１２側へ突出する偏心カム２２ａ（図４参照）が、中央に通孔２２ｂが形成されている。同様に、第２支持板２４には、第２内歯１４側へ突出する偏心カム２４ａが、中央に通孔２４ｂが形成されている。第１内歯１２の中央には、第１支持板２２の偏心カム２２ａを収容する通孔１２ａが、第２内歯１４の中央には、第２支持板２４の偏心カム２４ａを収容する通孔１４ａが形成されている。第１支持板２２の偏心カム２２ａと第１内歯１２の通孔１２ａとの間には、１対の楔部材２８が配置される。同様に、第２支持板２４の偏心カム２４ａと第２内歯１４の通孔１４ａとの間には、１対の楔部材２８が配置される。楔部材２８はスプリング２６により付勢される。
【００２６】
第１支持板２２と第２支持板２４との構成について、図７及び図８を参照して更に詳細に説明する
図７（Ａ）は第２支持板２４の斜視図であり、図７（Ｂ）は楔部材２８の斜視図である。図８（Ａ）は第１支持板２２の側面図であり、図８（Ｂ）は正面図である。図８（Ｃ）は第２支持板２４の正面図であり、図８（Ｄ）は楔部材２８の正面図である。図８（Ｅ）は第２内歯１４の通孔１４ａ内に収容される偏心カム２４ａと楔部材２８とを示す正面図である。
【００２７】
図８（Ａ）及び図８（Ｂ）に示すように、第１支持板２２には、遊星歯車３２Ａ、３２Ｂを自転自在に保持する軸２２ｃが形成されている。一方、図８（Ｃ）に示すように、第２支持板２４側には、第１支持板２２の軸２２ｃの先端を嵌入させるための軸受け孔２４ｃが穿設されている。図８（Ｄ）及び図８（Ｅ）に示すように、第２支持板２４の偏心カム２４ａは、第２内歯１４の通孔１４ａ内周と接する摺接部２４ａｓと、カム部２４ａｃとからなる。カム部２４ａｃの内径は、通孔１４ａ（即ち、摺接部２４ａｓ）の内径よりも小径に形成され、カム部２４ａｃの軸中心２４Ｘは、通孔１４ａの軸中心１４Ｘよりも摺接部２４ａｓ側に偏位している。なお、第１支持板２２の偏心カム２２ａも同様に構成されている。楔部材２８は、図５中に示すスプリング２６の先端部２６ａを係止する係止部２８ａと、カム部２４ａｃの外周に沿って摺動するための内カム面２８ｂと、通孔１４ａの内周に沿って摺動するための外カム面２８ｃとが形成されている。楔部材２８は、係止部２８ａ側の高さＨ１は、他端側の高さＨ２よりも高く、即ち、楔形状に形成されている。
【００２８】
図３（Ａ）は減速機の正面図であり、図３（Ｂ）はカバー３６を外した状態の正面図である。図３（Ｂ）に示すように、楔部材２８はスプリング２６により偏心カム２４ａを偏位させる。即ち、図８（Ｅ）中で、スプリング２６によって右側の楔部材２８は反時計方向に付勢され、左側の楔部材２８は時計方向に付勢され、偏心カム２４ａ（第２支持板２４）を、通孔１４ａの軸中心１４Ｘからカム部２４ａｃの軸中心２４Ｘ側へ押し上げる図中矢印Ｚで示す力を発生する。
【００２９】
引き続き、第１実施形態に係る減速機の動作について図６を参照して説明する。図６は、図４に示す減速機のＸ−Ｘ縦断面図である。
シャフト２０に固定された太陽歯車３０の周囲には、１２０度間隔で３個の遊星歯車３２Ａ、３２Ｂ、３２Ｃが取り付けられ、遊星歯車３２Ａ、３２Ｂ、３２Ｃは、第１内歯１２と同時に、図４中に示す第２内歯１４と噛合している。なお、遊星歯車３２Ａ、３２Ｂは、第１支持板２２の１対の軸２２ｃにより支持され、遊星歯車３２Ｃは、軸により支持されていない状態で、太陽歯車３０と第１内歯１２及び第２内歯１４との間に保持される。ここで、リクライニング装置の図示しないスイッチが操作されモータ、又は、手動調整機構によりシャフト２０が回転させられると、太陽歯車３０が回転し、これに伴い各遊星歯車３２Ａ、３２Ｂ、３２Ｃが自転すると共に、太陽歯車３０の回りを公転する。なお、遊星歯車３２Ａ、３２Ｂを支持する第１支持板２２、第２支持板２４は、遊星歯車３２Ａ、３２Ｂと共に太陽歯車３０の回りを公転する。遊星歯車３２Ａ、３２Ｂ、３２Ｃの自転、公転により、遊星歯車３２Ａ、３２Ｂ、３２Ｃに同時に噛合する第１内歯１２と第２内歯１４との間に回転差が生じ、図１を参照して上述した第２内歯１４側と連動するシートバック６０が、第１内歯１２側に固定されたシートクッション７０に対して角度調整される。
【００３０】
ここで、第１実施形態のガタ取り機構の動作について更に図６を参照して説明する。第１支持板２２の１対の軸２２ｃにより自転可能に支持された遊星歯車３２Ａ、３２Ｂは、図８（Ｅ）を参照して上述した偏心カム２２ａ、２４ａにより残り１個の遊星歯車３２Ｃと反対方向（図中Ｚで示す）へ偏位させられる。該２個の遊星歯車３２Ａ、３２Ｂは、それぞれの中心とシャフト２０の中心とを結ぶ線分から外れたＺ方向に偏位させられるため、それぞれ自転方向へのモーメントが生じる。即ち、遊星歯車３２Ａには反時計方向のモーメントが生じ、遊星歯車３２Ｂには時計方向のモーメントが生じ、互いに近づく公転方向へ移動しようとする。しかしながら、遊星歯車３２Ａ、３２Ｂは、それぞれ太陽歯車３０と噛合しており、且つ、第１支持板２２、第２支持板２４により公転方向への移動が規制させられるため、遊星歯車３２Ａ、３２Ｂは第１内歯１２、第２内歯１４と強固に噛合する。これにより、停止状態での遊星歯車３２Ａ、３２Ｂと第１内歯１２、第２内歯１４との間で隙間が無くなり、両者間でのバックラッシュ、がたつきを無くすことができる。
【００３１】
即ち、Ｚ方向への変位により、第１内歯１２、第２内歯１４のいずれか一方に対して、第１支持板２２、第２支持板２４及び遊星歯車３２Ａ、３２Ｂは、噛み合い方向へ押圧され、同時に、他方の内歯に対して、第１支持板２２、第２支持板２４及び遊星歯車３２Ａ、３２Ｂは引き付けられる。これにより、第１内歯１２と第２内歯１４とが相対的に反対方向へ押圧され、遊星歯車３２Ａ、３２Ｂと第１内歯１２、第２内歯１４との間で隙間が無くなる。これに伴い、歯数差があり、同一の歯形ではない上に、加工精度にバラツキの出る第１内歯１２、第２内歯１４を用いても、遊星歯車３２Ａ、３２Ｂによって押圧される。この２個の遊星歯車３２Ａ、３２Ｂは、太陽歯車３０のシャフト２０を支点とする第１支持板２２の軸２２ｃで支持されるため、確実にガタ、遊びを無くすことができる。
【００３２】
ここで、第１支持板２２、第２支持板２４は、シャフト２０に枢支され、太陽歯車３０と共に２個の遊星歯車３２Ａ、３２Ｂを第１内歯１２及び第２内歯１４に対して偏位させる。即ち、第１支持板２２、第２支持板２４は、該２個の遊星歯車３２Ａ、３２Ｂと共に太陽歯車３０を残り１個の遊星歯車３２Ｃと反対方向へ偏位させる。太陽歯車３０が遊星歯車３２Ｃと反対方向Ｚへ偏位するため（即ち、相互に回転モーメントを発生させない方向へ偏位するため）、該太陽歯車３０と該１個の遊星歯車３２Ｃとの間で抵抗が生じず、円滑に２個の遊星歯車３２Ａ、３２Ｃを偏位させることができる。また、該太陽歯車３０が共に該２個の遊星歯車３２Ａ、３２Ｂと偏位するため、太陽歯車３０と遊星歯車３２Ａ、３２Ｂとの間でがたつきが生じない。
【００３３】
更に、本実施形態の減速機１０は、遊星歯車３２Ａ、３２Ｂと第１内歯１２との間に配置される第１支持板２２と、遊星歯車３２Ａ、３２Ｂと第２内歯１４との間に配置される第２支持板２４とを備える。そして、第１支持板２２及び第２支持板２４は、遊星歯車３２Ａ、３２Ｂを遊星歯車３２Ｃと反対方向Ｚへそれぞれ偏位させる。このため、第１内歯１２と遊星歯車３２Ａ、３２Ｂとの間にがたつき（クリアランス）がある場合には、主として第１支持板２２が両者のがたを取り、第２内歯１４と遊星歯車３２Ａ、３２Ｂとの間にがたつき（クリアランス）がある場合には、主として第２支持板２４が両者のがたを取る。これにより、第１内歯１２、第２内歯１４のいずれの側にがたつき（クリアランス）があっても、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００３４】
なお、第１実施形態では、スプリング２６の付勢力を調整することで、減速機１０の停止時には、偏心カム２２ａ、２４ａにより、遊星歯車３２Ａ、３２ＢはＺ方向へ偏位し、回転時には、第１内歯１２、第２内歯１４側からの抵抗力により、遊星歯車３２Ａ、３２Ｂは偏位位置から円滑に回転し得る位置まで押し戻される。これにより、揺動回転が生じないよう設定されている。また、第１実施形態では、シャフト２０は、第１内歯１２、第２内歯１４、太陽歯車３０、第１支持板２２、第２支持板２４に対しても偏位する。また、第１支持板２２の軸２２ｃは、遊星歯車３２Ａ、３２Ｂに対して偏位する。このため、これらとの間に僅かな遊び（ガタ）が積極的に設けられている。即ち、本発明は、操作軸が変位しないという従来の考え方に対して、操作に支障のない範囲で変位を許容する点で、根本的に異なり、加工精度を高めることなく所望の目的を達することが可能である。
【００３５】
本実施形態では、停止状態でのがたを無くす減速機を用いため、リクライニング装置の停止状態での減速機内でのバックラッシュ、シートバックのがたつきを無くすことができる。
【００３６】
[第１実施形態の第１改変例]
図９（Ａ）は、本発明の第１実施形態の第１改変例に係る減速機の構成を示す断面図である。上述した第１実施形態では、３個の遊星歯車を用いたが、第１実施形態の第１改変例では、４個の遊星歯車３２Ｄ、３２Ｅ、３２Ｆ、３２Ｇを用いる。この第１実施形態の第１改変例では、２個の遊星歯車３２Ｄ、３２Ｅが、第１支持板２２及び第２支持板（図示せず）により保持され、第１実施形態と同様な偏心カム機構により図中で示すＺ２方向（残りの遊星歯車３２Ｆ、３２Ｇの中心を結ぶ線分に対して垂直方向）に付勢される。この第１実施形態の第１改変例では、支持板２２により遊星歯車の内の半数以上を外周側へ偏位させるため、２個の遊星歯車３２Ｄ、３２Ｅと第１内歯１２、第２内歯（図示せず）とが強固に噛合し、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００３７】
[第１実施形態の第２改変例]
図９（Ｂ）は、本発明の第１実施形態の第２改変例に係る減速機の構成を示す断面図である。第１実施形態の第２改変例では、第１実施形態の第１改変例と同様に４個の遊星歯車３２Ｄ、３２Ｅ、３２Ｆ、３２Ｇを用いる。この第１実施形態の第２改変例では、３個の遊星歯車３２Ｄ、３２Ｆ、３２Ｇが、第１支持板２２及び第２支持板（図示せず）により保持され、第１実施形態と同様な偏心カム機構により図中で示すＺ３方向（残りの遊星歯車３２Ｆの中心と太陽歯車３０中心を結ぶ線上）に付勢される。この第１実施形態の第２改変例では、支持板２２により遊星歯車の内の半数以上を外周側へ偏位させるため、３個の遊星歯車３２Ｄ、３２Ｅ、３２Ｇと第１内歯１２、第２内歯（図示せず）とが強固に噛合し、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００３８】
上述した実施形態では、遊星歯車が３個以上の場合を例示したが、遊星歯車が２個の場合も、片側を偏位させることで、停止状態でのバックラッシュ、がたつきを無くすことができる。
【００３９】
[第２実施形態]
図１３は、本発明の第２実施形態に係るリクライニング装置５０を示すもので、図１を参照して上述した第１実施形態と同様である。ただし、第１実施形態では、第１内歯１２に第１規制部１２ｂ、第２規制部１２ｃ、第３規制部１３ｂの３個の規制部がそれぞれ間隔を異ならしめ設けられ、３種類のリクライニング操作角度が調整できた。これに対して、第２実施形態では、第１内歯１２に第１規制部１２ｂと第２規制部１２ｃとの２個の規制部が左右の間隔を異ならしめ設けられ、２種類のリクライニング操作角度が調整できるように構成されている。
【００４０】
即ち、第１内歯１２の内周縁に、第２内歯側へ突出する第１規制部１２ｂ、第２規制部１２ｃを、第１規制部１２ｂの図中右端部から第２規制部１２ｃの右端部までと、第１規制部１２ｂの図中左端部から第２規制部１２ｃの左端部までとの間隔を異ならしめ設け、即ち、第１規制部１２ｂの右端部と第２規制部１２ｃの右端部との間の角度β１が１４０°、第１規制部１２ｂの左端部と第２規制部１２ｃの左端部との間の角度β２が１１０°となるように設定されている。一方、第２内歯１４の外周には、外周側（軸心と直角方向）に突出する当接部１４ｂが設けられている。
【００４１】
図１３中に示すように第２内歯１４の当接部１４ｂを第１規制部１２ｂの右端部と第２規制部１２ｃの右端部との間に来るように第２内歯１４を第１内歯１２に対して組み付けることで、第１規制部１２ｂの右端部と第２規制部１２ｃの右端部との角度β１（１４０°）に応じたリクライニング動作角度（具体的には、１４０°から当接部１４ｂの長さ分（２０°）を引いた１２０°）を設定できる。同様に、当接部１４ｂを第１規制部１２ｂの左端部と第２規制部１２ｃの左端部との間に来るように第２内歯１４を第１内歯１２に対して組み付けることで、第１規制部１２ｂの左端部と第２規制部１２ｃの左端部との角度β２（１１０°）に応じたリクライニング動作角度（具体的には、１１０°から当接部１４ｂの長さ分（２０°）を引いた９０°）を設定できる。この様に、第２内歯１４を第１内歯１２に組み付ける位置を変えることで、特別な部材を用いることなくリクライニング動作角度を２種類（１２０°、９０°）設定することができる。第２実施形態では、第１実施形態よりも大きな動作角度を設定することが容易に行える。
【図面の簡単な説明】
【図１】本発明の第１実施形態に係るリクライニング装置の説明図である。
【図２】図２（Ａ）は第１実施形態に係る減速機の斜視図であり、図２（Ｂ）は側面図である。
【図３】図３（Ａ）は図４に示す減速機の正面図であり、図３（Ｂ）はカバーを外した状態の図である。
【図４】図３（Ｂ）に示す減速機のＡ−Ａ断面図である。
【図５】第１実施形態に係る減速機の構成部品の組図である。
【図６】図４に示す減速機のＸ−Ｘ横断面図である。
【図７】図７（Ａ）は第２支持板の斜視図であり、図７（Ｂ）は楔部材の斜視図である。
【図８】図８（Ａ）は第１支持板の側面図であり、図８（Ｂ）は正面図であり、図８（Ｃ）は第２支持板の正面図であり、図８（Ｄ）は楔部材の正面図であり、図８（Ｅ）は第２内歯の通孔内に摺接する偏心カム及び楔部材を示す正面図である。
【図９】図９（Ａ）は第１実施形態の第１改変例の減速機の断面図であり、図９（Ｂ）は第１実施形態の第２改変例の減速機の断面図である。
【図１０】第１実施形態に係る減速機の第１内歯と第２内歯との組み付け位置を示す説明図である。
【図１１】第１実施形態に係る減速機の第１内歯と第２内歯との組み付け位置を示す説明図である。
【図１２】第１実施形態に係る減速機の第１内歯と第２内歯との組み付け位置を示す説明図である。
【図１３】本発明の第２実施形態に係るリクライニング装置の説明図である。
【符号の説明】
１０減速機
１２第１内歯
１２ａ通孔
１２ｂ第１規制部
１２ｃ第２規制部
１２ｄ第３規制部
１４第２内歯
１４ａ通孔
１４ｂ当接部
２０シャフト（軸）
２２第１支持板（保持部材）
２２ａ偏心カム
２２ｂ通孔
２２ｃ軸
２４第２支持板（保持部材）
２４ａ偏心カム
２４ｂ通孔
２４ｃ軸受け孔
２６スプリング
２８楔部材
３０太陽歯車
３２Ａ、３２Ｂ、３２Ｃ遊星歯車
３６カバー
５０リクライニング装置
６０シートバック
６２ブラケット
７０シートクッション
７２ブラケット
８０シート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reclining device for a vehicle seat that can adjust a tilt angle of a seat back steplessly using a reduction gear that uses a planetary gear.
[0002]
[Prior art]
Generally, a reclining device for adjusting and fixing the inclination angle of a seat back is attached to a driver's seat and a passenger seat (front seat) of a vehicle such as an automobile. For example, the reclining device adjusts the inclination angle of the seat back to an arbitrary position in a state where an occupant is seated and the back is pressed against the seat back, or when getting on and off the rear seat in a two-door vehicle, Operations such as moving the seat back forward to the foremost position with no occupant in the seat are performed.
[0003]
In this reclining device, there are a stepped adjustment type in which the inclination angle of the seat back is adjusted stepwise using a latch mechanism and a stepless adjustment type. The stepless adjustment type generally employs a planetary gear reducer or this deformation mechanism (for example, a Taumel mechanism using a gear having a different number of teeth from the eccentric shaft), and the inclination angle of the seat back can be adjusted steplessly. I do it. Planetary gear speed reducers are often used particularly for power type reclining devices driven by an electric motor.
[0004]
Since the planetary gear reducer meshes gears having different numbers of teeth at the same time, the planetary gear reducer inherently has a backlash regardless of the processing accuracy, and the backlash tends to occur due to the processing accuracy and heat treatment strain. Furthermore, if it is precisely processed to prevent rattling, actual assembly may not be possible. For this reason, for example, Patent Documents 1 to 6 have been proposed in order to prevent the reclining device using the planetary gear speed reducer from rattling and suppressing rattling.
[0005]
Patent Document 1 discloses that the tooth surface of the sun gear is inclined and the planetary gear is pressed against the upper / lower gear by biasing means (conical / axial spring). Patent Document 2 discloses that a spring ring plate (20) is provided with a slight clearance provided in the Chris foam (12), and the planetary gear (8) is pressed by the spring ring plate (20). Yes. Patent Document 3 discloses that a planetary gear is elastically urged toward a ring gear. Patent Document 4 discloses a configuration in which a planetary gear is held by a linear spring material having a bending / separating portion that urges the planetary gear radially. On the other hand, in Patent Document 5 and Patent Document 6, in a deformation mechanism of a planetary gear mechanism (a Taurume mechanism using a gear having a different number of teeth from an eccentric shaft), a wedge segment is provided on an eccentric shaft portion to prevent play and play. A configuration is disclosed.
[0006]
[Patent Document 1]
JP-A-6-277128
[Patent Document 2]
Japanese Patent Publication No. 8-4539
[Patent Document 3]
No. 8-3312
[Patent Document 4]
Utility Model Registration No. 2508237
[Patent Document 5]
Japanese Patent Publication No.63-47443
[Patent Document 6]
Japanese Patent Laid-Open No. 2001-211950
[0007]
[Problems to be solved by the invention]
The maximum inclination angle of the seat back varies depending on the vehicle type. For this reason, the reclining apparatus respond | corresponded using the member which sets an operating angle with respect to the sheet | seat from which the operating angle of a seat back differs. Therefore, the cost of the parts increases and a work for assembling the parts is required separately.
[0008]
Further, in Patent Documents 1 to 4, the planetary gear is urged to the two large internal teeth by a spring or the like, but the two large internal teeth have different numbers of teeth and are not the same tooth profile. Even if these are pressed, it is theoretically impossible to eliminate the play between the two large internal teeth and the planetary gear. In addition to this, it is inevitable that the backlash occurs due to the processing accuracy. Since Patent Documents 5 and 6 employ an eccentric shaft portion, there has been a basic problem of swinging and rotating during operation.
[0009]
The inventions of claim 1 and claim 2 have been made to solve the above-mentioned problems, and the object of the invention is a reclining device capable of setting a plurality of types of reclining operation angles without using a special member. Is to provide.
[0010]
Another object of the present invention is to provide a reclining device that eliminates backlash in a stopped state.
[0011]
[Means for Solving the Problem and Actions and Effects of the Invention]
In order to solve the above problems, the invention of claim 1 includes a first internal tooth fixed to one of the seat cushion side and the seat back side,
A second internal tooth that is fixed to the other of the seat cushion side and the seat back side and is disposed to face the first internal tooth so as to be rotatable.
A reclining device using a reduction gear comprising the first internal teeth and a gear meshing with the second internal teeth,
The first restricting portion, the second restricting portion, and the third restricting portion that protrude toward the second inner tooth side are provided at different intervals in the inner periphery of the first inner tooth
A contact portion that protrudes toward the outer periphery is provided on the outer periphery of the second internal tooth, and the contact portion is between the first restriction portion and the second restriction portion, and the second restriction portion and the third restriction portion. Or between the third restricting portion and the first restricting portion, and when the second internal tooth rotates, the corresponding contact portion becomes the first restricting portion or the second restricting portion. The technology is configured to regulate the rotation angle of the second internal teeth by abutting, abutting on the second regulating portion or the third regulating portion, or abutting on the third regulating portion or the first regulating portion, respectively. Characteristic.
[0012]
In the reclining device according to claim 1, a first restricting portion, a second restricting portion, and a third restricting portion that protrude toward the second inner tooth side are provided on the inner peripheral edge of the first inner tooth at different intervals, and the second inner tooth An abutting portion that protrudes to the outer peripheral side is provided on the outer periphery. And the space | interval of a 1st control part and a 2nd control part is assembled | attached with respect to a 2nd internal tooth so that a contact part may come between a 1st control part and a 2nd control part. The reclining operation angle can be set according to. Similarly, by assembling the first internal teeth with respect to the second internal teeth so that the contact portion is located between the second restricting portion and the third restricting portion, the second restricting portion and the third restricting portion A reclining operation angle corresponding to the interval can be set. Moreover, the reclining according to the space | interval of a 3rd control part and a 1st control part is carried out by assembling | attaching a 1st internal tooth with respect to a 2nd internal tooth so that it may come between a 3rd control part and a 1st control part. The operating angle can be set. In this manner, by changing the position where the second internal teeth are assembled to the first internal teeth, three types of reclining operation angles can be set without using a special member.
[0013]
In the invention of claim 2, the first internal teeth fixed to either the seat cushion side or the seat back side;
A second internal tooth that is fixed to the other of the seat cushion side and the seat back side and is disposed to face the first internal tooth so as to be rotatable.
A reclining device using a reduction gear comprising the first internal teeth and a gear meshing with the second internal teeth,
From the one end part of the first restricting part to the one end part of the second restricting part, the first restricting part protruding to the second inner tooth side on the inner peripheral edge of the first inner tooth, Providing different intervals from the other end of the first restricting portion to the other end of the second restricting portion;
An abutting portion projecting to the outer peripheral side is provided on the outer periphery of the second inner tooth, and the corresponding contact portion is between the one end portion of the first restricting portion and the one end portion of the second restricting portion, or The first restricting portion is disposed between the other end portion of the first restricting portion and the other end portion of the second restricting portion, and when the second internal tooth rotates, the corresponding contact portion becomes the first restricting portion. The second internal teeth by abutting against one end of the first regulating portion or one end of the second regulating portion, or abutting the other end of the first regulating portion or the other end of the second regulating portion. It is a technical feature that the rotation angle of each is regulated.
[0014]
In the reclining device according to claim 2, the first restricting portion and the second restricting portion that protrude toward the second inner tooth side on the inner peripheral edge of the first inner tooth are connected to the second restricting portion from one end of the first restricting portion. An abutting portion that protrudes outwardly on the outer periphery of the second internal tooth by providing different intervals between one end and the other end of the first restricting portion to the other end of the second restricting portion. Is provided. Then, the first internal teeth are assembled to the second internal teeth so that the contact portion is located between one end portion of the first restricting portion and one end portion of the second restricting portion. A reclining operation angle can be set according to the distance between one end of the restricting portion and one end of the second restricting portion. Similarly, by assembling the first internal teeth with respect to the second internal teeth so that the contact portion is between the other end of the first restricting portion and the other end of the second restricting portion, The reclining operation angle can be set according to the distance between the other end of the first restricting portion and the other end of the second restricting portion. Thus, by changing the position where the second internal teeth are assembled to the first internal teeth, two types of reclining operation angles can be set without using a special member.
[0015]
In the speed reducer according to claim 3, since more than half of the planetary gears are displaced to the outer peripheral side by the displacement means, the plurality of planetary gears are firmly meshed with the first internal teeth and the second internal teeth and stopped. Backlash in the state, rattling can be eliminated.
[0016]
In the speed reducer according to the fourth aspect, two of the three planetary gears are interlocked by the holding member and are displaced in the opposite direction to the remaining one planetary gear. The two planetary gears are deviated in a direction deviating from a line segment connecting the center of each planetary gear and the center of the shaft, and a moment in the rotation direction is applied to each of the planetary gears so as to move in a revolving direction approaching each other. . However, since it is meshed with the sun gear and the movement in the revolving direction is restricted by the holding member, the two planetary gears mesh firmly with the first internal teeth and the second internal teeth. As a result, backlash and rattling in a stopped state can be eliminated.
[0017]
Preferably, the holding member is pivotally supported on the shaft and shifts the two planetary gears together with the sun gear with respect to the first internal teeth and the second internal teeth. That is, the holding member shifts the sun gear together with the two planetary gears in the direction opposite to the remaining one planetary gear. Because the sun gear is displaced in the opposite direction to the remaining planet gear (ie, in a direction that does not generate a rotational moment with each other), the resistance between the sun gear and the one planet gear is Is not generated, and the two planetary gears can be smoothly displaced. Moreover, since both of the sun gears are deviated from the two planetary gears, no rattling occurs between the sun gear and the two planetary gears.
[0018]
Preferably, the pair of wedge members that slide between the inner periphery of the through hole formed at the center position of the first inner tooth or the second inner tooth and the outer periphery of the eccentric cam are biased in a direction away from the spring. Thus, the holding member shifts two of the planetary gears in the opposite direction to the remaining one planetary gear. As a result, the two planetary gears are firmly meshed with the first internal teeth and the second internal teeth, and backlash and rattling in the stopped state can be eliminated.
[0019]
Preferably, the holding member includes a first support plate disposed between the planetary gear and the first internal teeth, and a second support plate disposed between the planetary gear and the second internal teeth, The first support plate includes an eccentric cam that protrudes toward the first internal tooth side, and the second support plate includes an eccentric cam that protrudes toward the second internal tooth side. A pair of wedge members that slide between the inner periphery of the through hole formed at the center position of the first inner tooth and the second inner tooth and the outer periphery of the eccentric cam are attached in the direction away from each other by the spring. By being energized, the first support plate and the second support plate shift each of the two planetary gears in the opposite direction to the remaining one planetary gear. For this reason, when there is rattling (clearance) between the first internal teeth and the two planetary gears, the first support plate mainly takes the backlash between the two, and the second internal teeth and the two planetary gears. When there is rattling (clearance) between the planetary gears, the second support plate mainly rattles both, so rattling on either side of the first internal tooth or the second internal tooth ( Even if there is a clearance, backlash and rattling in the stopped state can be eliminated.
[0020]
In claim 5, the reduction gear of the planetary gear mechanism comprising two planetary gears meshing with the first internal gear and the second internal gear, a sun gear meshing with the planetary gear, and a shaft for driving the sun gear. And it is provided with the deviating means which deviates one of the two planetary gears to the outer peripheral side. Since one planetary gear meshes firmly with the first internal teeth and the second internal teeth, backlash and rattling in the stopped state can be eliminated.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 shows a seat to which a reclining device 50 according to a first embodiment of the present invention is attached, and a seat 80 includes a seat back 60 and a seat cushion 70. The reclining device 50 includes a planetary gear type speed reducer 10 which will be described later, a bracket 72 fixed to the first internal tooth side 12 side of the speed reducer, and a bracket 62 fixed to the second internal tooth side 14. The bracket 62 is fixed to the seat cushion 70, and the bracket 72 is fixed to the seat cushion 70 side. The reclining device 50 is configured to adjust the relative rotation angle between the bracket 62 and the bracket 72, that is, the angle of the seat back 60 with respect to the seat cushion 70 when a switch (not shown) is operated.
[0022]
2A is a perspective view of the speed reducer 10 shown in FIG. 1, FIG. 2B is a side view, FIG. 3A is a front view of the speed reducer 10, and FIG. ) Is a front view of the speed reducer with the cover 36 removed, FIG. 4 is a cross-sectional view taken along line AA of the speed reducer shown in FIG. 3 (B), and FIG. 5 is an assembly diagram of the components of the speed reducer. is there.
4 and 5, the speed reducer 10 is connected to the first internal teeth 12 connected to the seat cushion 70 side shown in FIG. 1 via a bracket 72 and to the seat back 60 side via a bracket 62. Second internal teeth 14. The number of teeth of the first internal teeth 12 is, for example, 33, and the number of teeth of the second internal teeth 14 is, for example, 36. Here, when three planetary gears are used, the difference in the number of teeth between the first internal teeth 12 and the second internal teeth 14 is a multiple of three. A cover 36 is attached to the outside of the first internal teeth 12 and the second internal teeth 14. Three planetary gears 32 A, 32 B, and 32 C are disposed around the sun gear 30 and the sun gear inside the first internal teeth 12 and the second internal teeth 14.
[0023]
A first restricting portion 12b, a second restricting portion 12c, and a third restricting portion 13b that protrude toward the second inner tooth 14 are provided at the inner peripheral edge of the first inner tooth 12 at different intervals. That is, as shown in FIG. 1, the angle α1 between the first restricting portion 12b and the second restricting portion 12c is 110 °, and the angle α2 between the second restricting portion 12c and the third restricting portion 12d is 90. The angle α3 between the third restricting portion 12d and the first restricting portion 12b is set to be 70 °. On the other hand, the outer periphery of the second internal tooth 14 is provided with a contact portion 14b that protrudes to the outer peripheral side (perpendicular to the axis).
[0024]
Here, as shown in FIG. 1 and FIG. 10 showing the assembled state, the second inner tooth 14 is in contact with the contact portion 14b between the first restricting portion 12b and the second restricting portion 12c. By assembling the inner teeth 14 with respect to the first inner teeth 12, a reclining operation angle (specifically, from 110 °) corresponding to the angle α1 (110 °) between the first restricting portion 12b and the second restricting portion 12c. 90 ° minus the length of the contact portion 14b (20 °) can be set. Similarly, as shown in FIG. 11, by assembling the second internal teeth 14 to the first internal teeth 12 so that the contact portion 14b is between the second restricting portion 12c and the third restricting portion 12d. The reclining operation angle corresponding to the angle α2 (90 °) between the second restricting portion 12c and the third restricting portion 12d (specifically, the length (20 °) of the contact portion 14b is subtracted from 90 °. 70 °) can be set. Further, as shown in FIG. 12, the second inner teeth 14 are assembled to the first inner teeth 12 so that the contact portion 12b is located between the third restricting portion 12d and the first restricting portion 12b. 3 Reclining operation angle corresponding to the angle α3 (70 °) between the restricting portion 12d and the first restricting portion 12b (specifically, 50 ° obtained by subtracting the length (20 °) of the contact portion 14b from 70 °. ) Can be set. In this way, by changing the position where the second internal teeth 14 are assembled to the first internal teeth 12, the reclining operation angle can be set to three types (90 °, 70 °, 50 °) without using a special member. it can.
[0025]
The description will be continued with reference to FIG. Between the planetary gears 32A, 32B, 32C and the first internal teeth 12, a first support plate 22 that holds the planetary gears 32A, 32B is provided between the planetary gears 32A, 32B, 32C and the second internal teeth 14. A second support plate 24 that holds the planetary gears 32A and 32B is disposed therebetween. The first support plate 22 has an eccentric cam 22a (see FIG. 4) that protrudes toward the first internal teeth 12 and a through hole 22b at the center. Similarly, the second support plate 24 is formed with an eccentric cam 24a protruding toward the second internal teeth 14 and a through hole 24b at the center. A through hole 12a for accommodating the eccentric cam 22a of the first support plate 22 is provided at the center of the first internal tooth 12, and a through hole for accommodating the eccentric cam 24a of the second support plate 24 is provided at the center of the second internal tooth 14. A hole 14a is formed. A pair of wedge members 28 are disposed between the eccentric cam 22 a of the first support plate 22 and the through hole 12 a of the first internal tooth 12. Similarly, a pair of wedge members 28 are disposed between the eccentric cam 24 a of the second support plate 24 and the through hole 14 a of the second internal tooth 14. The wedge member 28 is biased by the spring 26.
[0026]
The configuration of the first support plate 22 and the second support plate 24 will be described in more detail with reference to FIGS. 7 and 8.
FIG. 7A is a perspective view of the second support plate 24, and FIG. 7B is a perspective view of the wedge member 28. FIG. 8A is a side view of the first support plate 22, and FIG. 8B is a front view. FIG. 8C is a front view of the second support plate 24, and FIG. 8D is a front view of the wedge member 28. FIG. 8E is a front view showing the eccentric cam 24 a and the wedge member 28 accommodated in the through hole 14 a of the second internal tooth 14.
[0027]
As shown in FIGS. 8A and 8B, the first support plate 22 is formed with a shaft 22c that holds the planetary gears 32A and 32B in a freely rotating manner. On the other hand, as shown in FIG. 8C, a bearing hole 24c for fitting the tip of the shaft 22c of the first support plate 22 is formed on the second support plate 24 side. As shown in FIGS. 8D and 8E, the eccentric cam 24a of the second support plate 24 includes a sliding contact portion 24as that is in contact with the inner periphery of the through hole 14a of the second internal tooth 14, and a cam portion 24ac. Consists of. The cam portion 24ac has an inner diameter smaller than the inner diameter of the through hole 14a (that is, the sliding contact portion 24as), and the shaft center 24X of the cam portion 24ac is closer to the sliding contact portion 24as than the shaft center 14X of the through hole 14a. It is biased to. The eccentric cam 22a of the first support plate 22 is similarly configured. The wedge member 28 includes an engaging portion 28a for engaging the distal end portion 26a of the spring 26 shown in FIG. 5, an inner cam surface 28b for sliding along the outer periphery of the cam portion 24ac, and an inner portion of the through hole 14a. An outer cam surface 28c for sliding along the circumference is formed. The wedge member 28 has a height H1 on the locking portion 28a side higher than a height H2 on the other end side, that is, is formed in a wedge shape.
[0028]
FIG. 3A is a front view of the speed reducer, and FIG. 3B is a front view with the cover 36 removed. As shown in FIG. 3B, the wedge member 28 deflects the eccentric cam 24 a by the spring 26. That is, in FIG. 8E, the right wedge member 28 is biased counterclockwise by the spring 26, the left wedge member 28 is biased clockwise, and the eccentric cam 24a (second support plate 24). Is generated from the shaft center 14X of the through hole 14a toward the shaft center 24X of the cam portion 24ac.
[0029]
The operation of the speed reducer according to the first embodiment will be described with reference to FIG. FIG. 6 is an XX longitudinal sectional view of the reduction gear shown in FIG.
Around the sun gear 30 fixed to the shaft 20, three planetary gears 32A, 32B, and 32C are attached at intervals of 120 degrees. The planetary gears 32A, 32B, and 32C are simultaneously shown in FIG. 4 meshes with second internal teeth 14 shown in FIG. The planetary gears 32A and 32B are supported by a pair of shafts 22c of the first support plate 22, and the planetary gear 32C is not supported by the shafts, and the sun gear 30, the first internal teeth 12, and the second gears. It is held between the internal teeth 14. Here, when a switch (not shown) of the reclining device is operated and the shaft 20 is rotated by a motor or a manual adjustment mechanism, the sun gear 30 rotates, and the planetary gears 32A, 32B, and 32C rotate along with this. Revolve around the sun gear 30. The first support plate 22 and the second support plate 24 that support the planetary gears 32A and 32B revolve around the sun gear 30 together with the planetary gears 32A and 32B. Due to the rotation and revolution of the planetary gears 32A, 32B, and 32C, a rotation difference is generated between the first internal teeth 12 and the second internal teeth 14 that simultaneously mesh with the planetary gears 32A, 32B, and 32C. The angle of the seat back 60 interlocking with the above-described second internal tooth 14 side is adjusted with respect to the seat cushion 70 fixed to the first internal tooth 12 side.
[0030]
Here, the operation of the backlash removal mechanism of the first embodiment will be further described with reference to FIG. The planetary gears 32A and 32B, which are rotatably supported by the pair of shafts 22c of the first support plate 22, are connected to the remaining planetary gear 32C by the eccentric cams 22a and 24a described above with reference to FIG. It is displaced in the opposite direction (indicated by Z in the figure). The two planetary gears 32A and 32B are displaced in the Z direction deviating from the line segment connecting the center of each of the planetary gears 32A and the center of the shaft 20, so that a moment in the rotation direction is generated. That is, a counterclockwise moment is generated in the planetary gear 32A, and a clockwise moment is generated in the planetary gear 32B, so that the planetary gear 32B tends to move in the revolving directions approaching each other. However, since the planetary gears 32A and 32B are meshed with the sun gear 30 and the movement in the revolving direction is restricted by the first support plate 22 and the second support plate 24, the planetary gears 32A and 32B are The first internal teeth 12 and the second internal teeth 14 mesh firmly. Thereby, there is no gap between the planetary gears 32A, 32B and the first internal teeth 12 and the second internal teeth 14 in the stopped state, and backlash and rattling between them can be eliminated.
[0031]
That is, the first support plate 22, the second support plate 24, and the planetary gears 32 A and 32 B move in the meshing direction with respect to any one of the first internal teeth 12 and the second internal teeth 14 due to the displacement in the Z direction. At the same time, the first support plate 22, the second support plate 24, and the planetary gears 32A and 32B are attracted to the other internal tooth. Thereby, the 1st internal tooth 12 and the 2nd internal tooth 14 are pressed in the opposite direction relatively, and a crevice disappears between planetary gears 32A and 32B, and the 1st internal tooth 12 and the 2nd internal tooth 14. Accordingly, there is a difference in the number of teeth, which are not the same tooth profile, and even if the first internal teeth 12 and the second internal teeth 14 that vary in processing accuracy are used, they are pressed by the planetary gears 32A and 32B. Since the two planetary gears 32A and 32B are supported by the shaft 22c of the first support plate 22 with the shaft 20 of the sun gear 30 as a fulcrum, play and play can be reliably eliminated.
[0032]
Here, the first support plate 22 and the second support plate 24 are pivotally supported by the shaft 20, and the two planetary gears 32 A and 32 B are connected to the first internal teeth 12 and the second internal teeth 14 together with the sun gear 30. Deviate. That is, the first support plate 22 and the second support plate 24 shift the sun gear 30 together with the two planetary gears 32A and 32B in the opposite direction to the remaining one planetary gear 32C. Since the sun gear 30 is displaced in the direction Z opposite to the planetary gear 32C (ie, in a direction in which no rotational moment is generated), between the sun gear 30 and the one planetary gear 32C. No resistance is generated, and the two planetary gears 32A and 32C can be smoothly displaced. Further, since both of the sun gears 30 are displaced from the two planetary gears 32A and 32B, no rattling occurs between the sun gear 30 and the planetary gears 32A and 32B.
[0033]
Furthermore, the speed reducer 10 according to the present embodiment includes a first support plate 22 disposed between the planetary gears 32A and 32B and the first internal teeth 12, and a space between the planetary gears 32A and 32B and the second internal teeth 14. And a second support plate 24 disposed on the surface. The first support plate 22 and the second support plate 24 deflect the planetary gears 32A and 32B in the direction Z opposite to the planetary gear 32C, respectively. For this reason, when there is rattling (clearance) between the first internal teeth 12 and the planetary gears 32A, 32B, the first support plate 22 mainly takes the backlash between the first internal teeth 12 and the planetary gears 32A, 32B. When there is rattling (clearance) between the planetary gears 32A and 32B, the second support plate 24 mainly rattles both. As a result, backlash and rattling in a stopped state can be eliminated regardless of which side of the first internal teeth 12 and the second internal teeth 14 is rattling (clearance).
[0034]
In the first embodiment, by adjusting the urging force of the spring 26, the planetary gears 32A and 32B are displaced in the Z direction by the eccentric cams 22a and 24a when the speed reducer 10 is stopped. The planetary gears 32A and 32B are pushed back from the deviated position to a position where they can be smoothly rotated by the resistance force from the first inner tooth 12 and the second inner tooth 14 side. Thereby, it is set so that no oscillating rotation occurs. In the first embodiment, the shaft 20 is also displaced with respect to the first internal teeth 12, the second internal teeth 14, the sun gear 30, the first support plate 22, and the second support plate 24. Further, the shaft 22c of the first support plate 22 is deviated with respect to the planetary gears 32A and 32B. For this reason, a slight play (backlash) is positively provided between them. That is, the present invention is fundamentally different from the conventional idea that the operating shaft is not displaced in that it allows the displacement within a range that does not hinder the operation, and achieves the desired purpose without increasing the machining accuracy. Is possible.
[0035]
In this embodiment, since the speed reducer that eliminates rattling in the stopped state is used, backlash and seat back rattling in the speed reducer when the reclining device is stopped can be eliminated.
[0036]
[First Modification of First Embodiment]
FIG. 9A is a cross-sectional view showing a configuration of a reduction gear according to a first modification of the first embodiment of the present invention. In the first embodiment described above, three planetary gears are used, but in the first modification of the first embodiment, four planetary gears 32D, 32E, 32F, and 32G are used. In the first modification of the first embodiment, the two planetary gears 32D and 32E are held by the first support plate 22 and the second support plate (not shown), and are the eccentric cams similar to the first embodiment. The mechanism is biased in the Z2 direction shown in the figure (perpendicular to the line segment connecting the centers of the remaining planetary gears 32F and 32G). In the first modification of the first embodiment, two or more planetary gears 32D and 32E, the first internal teeth 12 and the second internal gears are displaced by the support plate 22 so that more than half of the planetary gears are displaced to the outer peripheral side. Teeth (not shown) are firmly meshed with each other, and backlash and rattling in a stopped state can be eliminated.
[0037]
[Second modification of the first embodiment]
FIG. 9B is a cross-sectional view showing the configuration of the reduction gear according to the second modification of the first embodiment of the present invention. In the second modified example of the first embodiment, four planetary gears 32D, 32E, 32F, and 32G are used as in the first modified example of the first embodiment. In the second modification of the first embodiment, the three planetary gears 32D, 32F, and 32G are held by the first support plate 22 and the second support plate (not shown), and are the same as in the first embodiment. The eccentric cam mechanism biases it in the Z3 direction (on the line connecting the center of the remaining planetary gear 32F and the center of the sun gear 30). In the second modified example of the first embodiment, three or more planetary gears 32D, 32E, and 32G, the first internal teeth 12, 2 The internal teeth (not shown) are firmly meshed with each other, and backlash and rattling in a stopped state can be eliminated.
[0038]
In the embodiment described above, the case where the number of planetary gears is three or more is illustrated, but even when the number of planetary gears is two, the backlash in the stopped state and rattling can be eliminated by deviating one side. it can.
[0039]
[Second Embodiment]
FIG. 13 shows a reclining device 50 according to a second embodiment of the present invention, which is the same as the first embodiment described above with reference to FIG. However, in the first embodiment, the first inner teeth 12 are provided with three restricting portions of the first restricting portion 12b, the second restricting portion 12c, and the third restricting portion 13b at different intervals, and three types of reclining. The operation angle could be adjusted. On the other hand, in the second embodiment, the first inner teeth 12 are provided with two restricting portions of the first restricting portion 12b and the second restricting portion 12c with different left and right intervals, and two kinds of reclining operations. The angle can be adjusted.
[0040]
That is, the first restricting portion 12b and the second restricting portion 12c projecting toward the second inner tooth side are provided on the inner peripheral edge of the first inner tooth 12 from the right end portion of the first restricting portion 12b in the drawing. The distance between the right end and the left end of the first restricting portion 12b in the drawing to the left end of the second restricting portion 12c is different, that is, the right end of the first restricting portion 12b and the second restricting portion 12c The angle β1 between the right end portion is set to 140 °, and the angle β2 between the left end portion of the first restricting portion 12b and the left end portion of the second restricting portion 12c is set to 110 °. On the other hand, the outer periphery of the second internal tooth 14 is provided with a contact portion 14b that protrudes to the outer peripheral side (perpendicular to the axis).
[0041]
As shown in FIG. 13, the second inner teeth 14 are arranged so that the contact portion 14b of the second inner teeth 14 is located between the right end portion of the first restricting portion 12b and the right end portion of the second restricting portion 12c. By assembling with respect to the inner teeth 12, a reclining operation angle (specifically, from 140 °) corresponding to an angle β1 (140 °) between the right end portion of the first restricting portion 12b and the right end portion of the second restricting portion 12c. 120 °) obtained by subtracting the length (20 °) of the contact portion 14b. Similarly, by assembling the second internal teeth 14 to the first internal teeth 12 so that the contact portion 14b is between the left end portion of the first restricting portion 12b and the left end portion of the second restricting portion 12c, A reclining operation angle corresponding to an angle β2 (110 °) between the left end portion of the first restricting portion 12b and the left end portion of the second restricting portion 12c (specifically, 110 ° to the length of the contact portion 14b (20 90 °) minus (°) can be set. In this way, by changing the position where the second internal teeth 14 are assembled to the first internal teeth 12, the reclining operation angle can be set to two types (120 ° and 90 °) without using a special member. In the second embodiment, it is possible to easily set a larger operating angle than in the first embodiment.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a reclining device according to a first embodiment of the present invention.
FIG. 2 (A) is a perspective view of the reduction gear according to the first embodiment, and FIG. 2 (B) is a side view.
3A is a front view of the speed reducer shown in FIG. 4, and FIG. 3B is a view with a cover removed.
4 is a cross-sectional view taken along line AA of the speed reducer shown in FIG. 3 (B).
FIG. 5 is an assembly diagram of components of the reduction gear according to the first embodiment.
6 is a cross-sectional view of the speed reducer shown in FIG. 4 taken along the line XX.
7A is a perspective view of a second support plate, and FIG. 7B is a perspective view of a wedge member.
8A is a side view of the first support plate, FIG. 8B is a front view, FIG. 8C is a front view of the second support plate, and FIG. FIG. 8D is a front view of the wedge member, and FIG. 8E is a front view showing the eccentric cam and the wedge member that are in sliding contact with the through holes of the second internal teeth.
9A is a cross-sectional view of a speed reducer according to a first modification of the first embodiment, and FIG. 9B is a cross-sectional view of a speed reducer according to a second modification of the first embodiment. is there.
FIG. 10 is an explanatory diagram showing an assembly position of the first internal teeth and the second internal teeth of the speed reducer according to the first embodiment.
FIG. 11 is an explanatory view showing an assembly position of the first internal teeth and the second internal teeth of the speed reducer according to the first embodiment.
FIG. 12 is an explanatory view showing an assembly position of the first internal teeth and the second internal teeth of the speed reducer according to the first embodiment.
FIG. 13 is an explanatory diagram of a reclining device according to a second embodiment of the present invention.
[Explanation of symbols]
10 Reducer
12 first internal teeth
12a through hole
12b 1st regulation part
12c 2nd regulation part
12d 3rd regulation part
14 Second internal teeth
14a through hole
14b Contact part
20 Shaft
22 First support plate (holding member)
22a Eccentric cam
22b through hole
22c axis
24 Second support plate (holding member)
24a Eccentric cam
24b through hole
24c Bearing hole
26 Spring
28 Wedge member
30 sun gear
32A, 32B, 32C Planetary gear
36 Cover
50 Reclining device
60 seat back
62 Bracket
70 seat cushion
72 Bracket
80 sheets

Claims

First internal teeth fixed to either the seat cushion side or the seat back side;
A second internal tooth that is fixed to the other of the seat cushion side and the seat back side and is disposed to face the first internal tooth so as to be rotatable.
A reclining device using a reduction gear comprising the first internal teeth and a gear meshing with the second internal teeth,
The first restricting portion, the second restricting portion, and the third restricting portion that protrude toward the second inner tooth side are provided at different intervals in the inner periphery of the first inner tooth
A contact portion that protrudes toward the outer periphery is provided on the outer periphery of the second internal tooth, and the contact portion is between the first restriction portion and the second restriction portion, and the second restriction portion and the third restriction portion. Or between the third restricting portion and the first restricting portion, and when the second internal tooth rotates, the corresponding contact portion becomes the first restricting portion or the second restricting portion. The rotation angle of the second internal teeth is respectively regulated by abutting, abutting on the second regulating part or the third regulating part, or abutting on the third regulating part or the first regulating part. Reclining device.

First internal teeth fixed to either the seat cushion side or the seat back side;
A second internal tooth that is fixed to the other of the seat cushion side and the seat back side and is disposed to face the first internal tooth so as to be rotatable.
A reclining device using a reduction gear comprising the first internal teeth and a gear meshing with the second internal teeth,
From the one end part of the first restricting part to the one end part of the second restricting part, the first restricting part protruding to the second inner tooth side on the inner peripheral edge of the first inner tooth, Providing different intervals from the other end of the first restricting portion to the other end of the second restricting portion;
An abutting portion projecting to the outer peripheral side is provided on the outer periphery of the second inner tooth, and the corresponding contact portion is between the one end portion of the first restricting portion and the one end portion of the second restricting portion, or The first restricting portion is disposed between the other end portion of the first restricting portion and the other end portion of the second restricting portion, and when the second internal tooth rotates, the corresponding contact portion becomes the first restricting portion. The second internal teeth by abutting against one end of the first regulating portion or one end of the second regulating portion, or abutting the other end of the first regulating portion or the other end of the second regulating portion. A reclining device configured to regulate the rotation angle of each.

The gears meshed with the first internal teeth and the second internal teeth are three or more planetary gears,
A sun gear meshing with the planetary gear;
A shaft for driving the sun gear;
The reclining device according to claim 1, further comprising: a displacement unit configured to deviate more than half of the planetary gears toward the outer peripheral side.

The gears meshing with the first internal teeth and the second internal teeth are three planetary gears,
A sun gear meshing with the planetary gear;
A shaft for driving the sun gear;
The two planetary gears are supported in a freely rotating manner, and the other planetary gears are linked on the line segment connecting the center of the remaining one planetary gear and the center of the shaft. And a holding member that deflects the two planetary gears in the opposite direction to the reclining device.

The gears meshing with the first internal teeth and the second internal teeth are two planetary gears,
A sun gear meshing with the planetary gear;
A shaft for driving the sun gear;
The reclining device according to claim 1, further comprising a displacement unit configured to deviate one of the two planetary gears toward the outer peripheral side.