JP4050807B2 - Brake pipe shaft mounting structure - Google Patents

Brake pipe shaft mounting structure Download PDF

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JP4050807B2
JP4050807B2 JP18800897A JP18800897A JP4050807B2 JP 4050807 B2 JP4050807 B2 JP 4050807B2 JP 18800897 A JP18800897 A JP 18800897A JP 18800897 A JP18800897 A JP 18800897A JP 4050807 B2 JP4050807 B2 JP 4050807B2
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Prior art keywords
pipe shaft
mounting hole
operation lever
small
brake
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JP18800897A
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JPH1129014A (en
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俊宏 浜本
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Otsuka Koki Co Ltd
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Otsuka Koki Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、車体側にベース部材を固設し、該ベース部材に操作レバーの基部を、パイプ軸を介して揺動可能に支持して成り、前記操作レバーを揺動させて制動力を発生させるブレーキのパイプ軸取付構造に関する。この種のブレーキには、前記操作レバーを足で踏み込んで操作力をブレーキ本体に伝える足踏み式パーキングブレーキ等がある。
【0002】
【従来の技術】
従来、足踏み式のブレーキでは、足で踏み込む操作レバーの基部にパイプ軸が固設され、このパイプ軸を介して操作レバーは車体側のベース部材に揺動可能に支持されていた。ここでパイプ軸の取付構造として、例えば図8に示すようなものがある。
【0003】
すなわち、パイプ軸1は操作レバー3にある丸孔4に貫通しており、パイプ軸1の端部2が操作レバー3の基部表面に対接した状態で丸孔4の周囲に溶接され、パイプ軸1は操作レバー3に対し回転不能に固設されていた。パイプ軸1は荷重が集中する部位であり、操作レバー3に対しての相当な取付強度が要求される。
【0004】
【発明が解決しようとする課題】
しかしながら、前述したようなパイプ軸1の取付構造では、パイプ軸1の端部2を、その全周に亘り操作レバー1に溶接することで固設するから、かかる溶接作業が煩わしく、時間もかかり、溶接工の特別な技能も必要となるため、製品のコストアップの要因になるという問題があった。
【0005】
また、溶接によりパイプ軸1及び操作レバー3の溶着金属の部分5が変生することがあり、取付部分の強度劣化を招く虞があった。ところで、昨今の設計仕様によると、パイプ軸1の取付構造も、より簡易でしかも確実に回転不能に拘束できるものへの変換が切望されていた。
【0006】
本発明は、以上のような従来技術が有する問題点に着目してなされたもので、パイプ軸を操作レバーの基部に簡易かつ迅速に取り付けることができ、しかも十分な取付強度を得て、操作レバーに対するパイプ軸の空回りを確実に防止することができるブレーキのパイプ軸取付構造を提供することを目的としている。
【0007】
【課題を解決するための手段】
前述した目的を達成するための本発明の要旨とするところは、次の各項に存する。
[1]車体側にベース部材(11)を固設し、該ベース部材(11)に操作レバー(20)の基部(21)を、パイプ軸(30)を介して揺動可能に支持して成り、前記操作レバー(20)を揺動させて制動力を発生させるブレーキのパイプ軸取付構造において、
前記操作レバー(20)の基部(21)に、前記パイプ軸(30)を貫通させる取付孔(22)を穿設し、該取付孔(22)の周囲に、その基準面より僅かな面積分だけ突出する小突起部(23)を突設し、
前記パイプ軸(30)の途中に、該パイプ軸(30)を軸心方向にプレスした際、全周に亘り潰れて外側に環状に広がるよう塑性変形する被かしめ部(34)を設け、
前記操作レバー(20)の取付孔(22)に前記パイプ軸(30)を貫通させた状態で、パイプ軸(30)を軸心方向にプレスし、パイプ軸(30)の塑性変形した前記被かしめ部(34)に、前記取付孔(22)の周囲にある小突起部(23)を食い込ませて、パイプ軸(30)を操作レバー(20)の取付孔(22)に対し回転不能に一体に固設し、
前記パイプ軸(30)の途中に、塑性変形した前記被かしめ部(34)に対して前記取付孔(22)の周囲を挟んで対向する受け部(33、35)を設け、
前記パイプ軸(30)は、前記被かしめ部(34)を含む肉薄の小径部分と肉厚の大径部分とから成り、前記小径部分と大径部分との境の断面部(33)を前記受け部(33)としたことを特徴とするブレーキのパイプ軸取付構造。
【0008】
[2]前記小突起部(23)を、取付孔(22)の周囲に等間隔に並ぶように複数設けたことを特徴とする[1]記載のブレーキのパイプ軸取付構造。
【0012】
次に前述した解決手段に基づく作用を説明する。
[1]項に係るブレーキのパイプ軸取付構造によれば、操作レバー(20)の基部(21)に、パイプ軸(30)を貫通させる取付孔(22)を穿設し、該取付孔(22)の周囲に、その基準面より僅かな面積分だけ突出する小突起部(23)を突設する。
【0013】
一方、パイプ軸(30)の途中には、軸心方向にプレスした際、全周に亘り潰れて外側に環状に広がる被かしめ部(34)を設ける。ここでパイプ軸(30)よりも操作レバー(20)の方が、剛性が高くなるように材質を選択するとよい。なお、パイプ軸(30)はプレス後、前記被かしめ部(34)が外側に広がるように潰れた分だけ全長が多少短くなる。
【0014】
そして、操作レバー(20)の取付孔(22)にパイプ軸(30)を貫通させた状態で、パイプ軸(30)を軸心方向にプレスする。プレス時には前記被かしめ部(34)を、小突起部(23)が突出する側の操作レバー(20)の表面上に位置させる。かかる状態でパイプ軸(30)を軸心方向にプレスし、塑性変形させた被かしめ部(34)に、取付孔(22)の周囲の小突起部(23)を食い込ませる。
【0015】
小突起部(23)は、取付孔(22)の周囲の基準面より僅かな面積分だけ突出する。従って、プレス当初に小突起部(23)が、潰れた被かしめ部(34)に対して接触する面積が小さい分だけ圧力が集中するので、小突起部(23)は被かしめ部(34)に確実に食い込む。このようにして、パイプ軸(30)は操作レバー(20)の取付孔(22)に対し回転不能に一体に固設される。
【0016】
以上のようなプレスによるかしめによれば、従来の溶接作業に比べて、操作レバー(20)の基部(21)にパイプ軸(30)を簡易かつ迅速に取り付けることができる。また、取付部位が溶接の場合のように変成することはなく、十分な取付強度を得ることができる。
さらに、前記パイプ軸(30)の途中に、塑性変形した被かしめ部(34)に対して取付孔(22)の周囲を挟んで対向する受け部(33、35)を設けたので、プレスの際に被かしめ部(34)にかかる圧力を受け止めることができ、かしめを確実に行うことができる。また、プレス後に取付孔(22)の周囲は被かしめ部(34)と受け部(33、35)とにより挟持されるため、取付強度を一層と高めることができる。
ここで前記受け部(33、35)に関しては、パイプ軸(30)における小径部分と大径部分との境の断面部(33)としたことにより、プレスを容易に行うことができる。
【0017】
[2]項に係るブレーキのパイプ軸取付構造によれば、前記小突起部(23)を取付孔(22)の周囲に等間隔に並ぶように複数設けたから、より十分な取付強度を確保することができる。
【0020】
【発明の実施の形態】
以下、図面に基づき本発明の各種実施の形態を説明する。
図1〜図6は本発明に係る第1の実施の形態を示している。
本実施の形態に係るブレーキは、足踏み式パーキングブレーキ10である。ただし、本発明に係るブレーキのパイプ取付構造は、パーキングブレーキに限定されるものではなく、常用ブレーキや補助ブレーキに適用してもよい。
【0021】
図6に示すように、足踏み式パーキングブレーキ10は、車体側に固設するベース部材11に、操作レバー20の基部21をパイプ軸30により揺動可能に支持し、該操作レバー20の揺動端側である先端部26にペダル27を取り付けて成る。本ブレーキ10は、ペダル27を踏むことにより、その操作力をブレーキ本体(図示せず)に伝えるように構成されている。
【0022】
図1に示すように、操作レバー20は、平面状に広がる基部21の一端より先端部26を含む揺動端側が細幅状に延出しており、金属から成形される。基部21には、パイプ軸30を軸支する円形の取付孔22が穿設されている。取付孔22の内径は、次述するパイプ軸30の小径部分31の外径とほぼ合致しており、取付孔22に対しパイプ軸30が密嵌するよう設定されている。
【0023】
図3〜図5に示すように、取付孔22の周囲には、その基準面Sより僅かな面積分だけ突出する小突起部23、23…が突設されている。各小突起部23は、取付孔22を中心とする放射線上に少し延び、基準面Sより山形に突出する形状にプレス成形されている。本実施の形態では、小突起部23は等間隔に合計8つ設けられているが、この数に限定されるものではない。
【0024】
図2に示すように、パイプ軸30は、肉薄の小径部分31と肉厚の大径部分32とから成る。小径部分31の途中には、パイプ軸30を軸心方向にプレスした際、全周に亘り潰れて外側に環状に広がるよう塑性変形する被かしめ部34が設けられている。また、小径部分31と大径部分32との境の断面部33は、塑性変形した前記被かしめ部34に対して、前記取付孔22の周囲を挟んで対向する受け部となっている。
【0025】
図1及び図2に示すように、操作レバー20の基部21にパイプ軸30を貫通させた状態で、パイプ軸30を軸心方向にプレスし、パイプ軸30の被かしめ部34を環状に広がるように潰すことで、基部21にパイプ軸30が回転不能に固設されている。パイプ軸30よりも操作レバー20の方が、剛性が高くなるように材質が選択されている。
【0026】
取付孔22の周囲にある各小突起部23は、被かしめ部34を食い込ませる部位であり、塑性変形した被かしめ部34には小突起部23が食い込んでいる。更に、プレス後の取付孔22の周囲は、前記被かしめ片34と断面部33とにより強固に挟持されている。パイプ軸30はプレス後、前記被かしめ部34が外側に広がるように潰れた分だけ全長が多少短くなる。
【0027】
また、操作レバー20の基部21の周縁には、セクタ歯部材38を取り付けるための固定部24や、その他ストッパ25等が設けられている。一方、先端部26にはペダル27が固設されている。ペダル27にはペダルパッド28が装着されている。ペダルパッド28は、例えば合成樹脂から成形され、操作者の脚方向を向く踏み面29には、滑り止めの溝29aが設けられている。
【0028】
足踏み式パーキングブレーキ10について詳しく言えば、図6に示すように、操作レバー20の基部21には、連結ブラケット36を介してブレーキ力を伝えるブレーキケーブル37が連結されている。また、基部21にはセクタ歯部材38が固着され、セクタ歯部材38のセクタ歯に噛み合わして係止する爪部材40を備えている。
【0029】
爪部材40の爪端41をセクタ歯部材38のセクタ歯に係脱するため、爪部材40の揺動端42を押圧する押圧子47を備えた解除部材46と、解除部材46の先端側に止結されたリリースケーブル48と、リリースケーブル48を引っ張るリリースハンドル49より成るリリース機構45が設けられている。
【0030】
セクタ歯部材38のセクタ歯に噛合する爪端41を有する爪部材40は枢支軸43により基部がベース部材11に枢着されており、枢支軸43からアーム状に長く延びた揺動端42を、リリース機構45を構成する解除部材46の押圧子47が臨んでいる。
【0031】
揺動端42とベース部材11との間には、爪端41がセクタ歯部材38のセクタ歯に噛合する方向に爪部材40を付勢するばね42aが張設されている。解除部材46は枢支軸46aによりベース部材11に揺動可能に枢支され、枢支軸46aの近傍に押圧子47が形成されており、遊端部46bにリリースケーブル48が止結されている。
【0032】
また、操作レバー20の略中間部位と枢支軸43との間には緩衝部材39が架設されている。緩衝部材39は、操作レバー20の戻り力を減退させて操作レバー20が戻る際の反動を緩衝し、衝撃を少なくするものであり、例えば、空気圧シリンダにより構成される。
【0033】
次ぎに、パイプ軸30の取り付けについて説明する。
操作レバー20の基部21にパイプ軸30を取り付けるには、先ず基部21に穿設した取付孔22に、パイプ軸30の小径部分31を貫通させる。この時、図2に示すように、パイプ軸30の大径部分32を下側にして治具上に置き、パイプ軸30の断面部32に、取付孔22の周囲の下面側を当接させた状態に保持する。塑性変形前の被かしめ部34は、ちょうど取付孔22の周囲の上面側(小突起部23が突出する側)に位置する。
【0034】
かかる状態で、パイプ軸30の小径部分31側の上端にプレス機を宛って、パイプ軸30を軸心方向にプレスする。すると、図2に示す如く被かしめ部34がかしめられて、小径部分31の全周に亘り潰れて、外側に環状に広がるよう塑性変形する。被かしめ部34には、取付孔22の周囲にある各小突起部23が十分に食い込む。
【0035】
各小突起部23は、取付孔22の周囲の基準面Sより僅かな面積分だけ突出するため、プレス当初に小突起部23が、潰れた被かしめ部34に対して接触する面積が小さい分だけ圧力が集中する。従って、各小突起部23を被かしめ部34に確実に食い込ませることができる。また、取付孔22の周囲は、前記被かしめ部34と断面部33とによって、表裏両側から強固に挟持される。
【0036】
以上のようにして、パイプ軸30は操作レバー20の取付孔22に対し回転不能に一体に固設される。このようなプレスによるパイプ軸30の取付構造によれば、従来の溶接作業に比べて、操作レバー20の基部21にパイプ軸30を簡易かつ迅速に取り付けることができる。また、取付部位が溶接の場合のように変生することはなく、十分な取付強度を得ることができる。
【0037】
以下、足踏み式パーキングブレーキ10の作用について簡単に説明する。図6中で実線に示すように、操作レバー20が踏み込み前の解除状態にあるとき、操作レバー20の基部21に設けたセクタ歯部材38のセクタ歯と爪部材40の爪端41との間には制動反力がかかっていない。
【0038】
ペダルを踏み込んで操作レバー20を揺動させると、ブレーキケーブル23が引き絞られて制動力が発生する。操作レバー20の揺動に伴いセクタ歯部材38も移動し、爪部材40との相対変位によりその爪端41がセクタ歯部材38のセクタ歯を乗り越えて移動する。
【0039】
操作レバー20のペダルを十分に踏み込み、足に加えた力をゆるめると操作レバー20は復帰しようとし、セクタ歯部材38のセクタ歯と爪部材40の爪端41とは制動反力を受けて噛み合わし、ブレーキケーブル23が引き絞られた制動状態を保持する。
【0040】
制動解除するときは、リリース機構45により爪部材40を爪端41がセクタ歯部材38のセクタ歯から外れる方向に小角度回動させる。すなわち、リリースハンドル49をつかんで引くと、リリースケーブル48が引き絞られ解除部材46が回動する。
【0041】
解除部材46は回動すると押圧子47により爪部材40の揺動端42を押し、爪部材40は爪端41がセクタ歯部材38のセクタ歯から離間する方向に回動する。爪部材40の爪端41がセクタ歯部材38のセクタ歯から外れると、操作レバー20は制動反力により復帰方向に揺動して解除状態に戻り、ブレーキケーブル23が緩んで制動が解除される。
【0042】
図7は本発明に係る第2の実施の形態を示している。
本実施の形態では、パイプ軸30Aが全長に亘り同一径に形成され、該パイプ軸30Aを軸心方向にプレスした際、前記被かしめ部34とは別に、該被かしめ部34に近接して環状に広がるように塑性変形させた受け部35が設けられている。
【0043】
この受け部35により、前記第1実施の形態の断面部33と同様に、プレスの際に被かしめ部34にかかる圧力を受け止めることができ、かしめを確実に行うことができる。また、プレス後に取付孔22の周囲は、被かしめ部34と受け部35とにより挟持されるため、取付強度を一層と高めることができる。
【0044】
また、本実施の形態の受け部35によれば、パイプ軸30Aを、その全長に亘って同一径に形成することができるため、パイプ軸30A自体の構成を簡易化することができる。
なお、本発明に係るブレーキのパイプ軸取付構造は、図示した各実施の形態に限定されるものではない。
【0045】
【発明の効果】
本発明に係るブレーキのパイプ軸取付構造によれば、操作レバーの取付孔にパイプ軸を貫通させた状態で、パイプ軸を軸心方向にプレスし、パイプ軸の塑性変形した被かしめ部に、取付孔の周囲にある小突起部を食い込ませて、パイプ軸を操作レバーの取付孔に対し回転不能に一体に固設し、前記パイプ軸の途中に、塑性変形した前記被かしめ部に対して前記取付孔の周囲を挟んで対向する受け部を設け、前記パイプ軸は、前記被かしめ部を含む肉薄の小径部分と肉厚の大径部分とから成り、前記小径部分と大径部分との境の断面部を前記受け部としたから、従来の溶接作業に比べて、操作レバーの基部にパイプ軸を簡易かつ迅速に取り付けることができ、また、取付部位が溶接により変成することもなく、十分な取付強度を得て操作レバーに対するパイプ軸の空回りを確実に防止することができる。
【図面の簡単な説明】
【図1】本発明の第1実施の形態に係るブレーキの操作レバーを示す正面図である。
【図2】本発明の第1実施の形態に係るブレーキのパイプ軸取付構造を示す断面図である。
【図3】本発明の第1実施の形態に係るブレーキの操作レバーに穿設した取付孔とその周囲の小突起部を示す拡大図である。
【図4】図3のIV−IV線断面図である。
【図5】図3のV−V線断面図である。
【図6】本発明の第1実施の形態に係るブレーキ全体を示す正面図である。
【図7】本発明の第2実施の形態に係るブレーキのパイプ軸取付構造を示す断面図である。
【図8】従来例のブレーキのパイプ軸取付構造を示す斜視図である。
【符号の説明】
10…足踏み式パーキングブレーキ
11…ベース部材
20…操作レバー
21…基部
22…取付孔
23…小突起部
26…先端部
27…ペダル
28…ペダルパッド
30…パイプ軸
33…断面部
34…被かしめ部型
[0001]
BACKGROUND OF THE INVENTION
The present invention includes a base member fixed to the vehicle body, and a base portion of an operation lever supported by the base member so as to be swingable via a pipe shaft. The control lever is swung to generate a braking force. The present invention relates to a pipe shaft mounting structure for a brake. This type of brake includes a foot-operated parking brake that depresses the operation lever with a foot and transmits an operation force to a brake body.
[0002]
[Prior art]
Conventionally, in a foot-operated brake, a pipe shaft is fixed to the base of an operation lever that is stepped on with a foot, and the operation lever is swingably supported by a base member on the vehicle body via the pipe shaft. Here, an example of the pipe shaft mounting structure is shown in FIG.
[0003]
That is, the pipe shaft 1 passes through the round hole 4 in the operation lever 3, and the pipe shaft 1 is welded around the round hole 4 with the end 2 of the pipe shaft 1 in contact with the base surface of the operation lever 3. The shaft 1 was fixed to the operation lever 3 so as not to rotate. The pipe shaft 1 is a part where loads are concentrated, and a considerable mounting strength with respect to the operation lever 3 is required.
[0004]
[Problems to be solved by the invention]
However, in the pipe shaft 1 mounting structure as described above, the end 2 of the pipe shaft 1 is fixed by welding to the operation lever 1 over the entire circumference thereof, so that the welding work is troublesome and takes time. However, special skills of the welder are also required, leading to an increase in product cost.
[0005]
In addition, the welded metal portion 5 of the pipe shaft 1 and the operation lever 3 may be transformed by welding, which may cause deterioration in strength of the mounting portion. By the way, according to the recent design specifications, there has been a strong demand for conversion of the pipe shaft 1 to a simpler and more reliable one that can be restrained so as not to rotate.
[0006]
The present invention has been made paying attention to the problems of the prior art as described above. The pipe shaft can be easily and quickly attached to the base of the operation lever, and sufficient operation strength can be obtained. An object of the present invention is to provide a pipe shaft mounting structure for a brake that can reliably prevent the pipe shaft from idling relative to a lever.
[0007]
[Means for Solving the Problems]
The gist of the present invention for achieving the above-described object resides in the following items.
[1] A base member (11) is fixed to the vehicle body, and a base (21) of an operation lever (20) is supported on the base member (11) so as to be swingable via a pipe shaft (30). In the pipe shaft mounting structure of the brake that generates the braking force by swinging the operation lever (20),
A mounting hole (22) for penetrating the pipe shaft (30) is formed in the base portion (21) of the operating lever (20), and the area around the mounting hole (22) is slightly smaller than the reference surface. A small protrusion (23) protruding only
In the middle of the pipe shaft (30), when the pipe shaft (30) is pressed in the axial direction, a caulking portion (34) that is plastically deformed so as to be crushed over the entire circumference and spread annularly outward is provided,
With the pipe shaft (30) passing through the mounting hole (22) of the operation lever (20), the pipe shaft (30) is pressed in the axial direction, and the pipe shaft (30) is plastically deformed. A small protrusion (23) around the mounting hole (22) is bitten into the caulking part (34) so that the pipe shaft (30) cannot rotate with respect to the mounting hole (22) of the operation lever (20). Fixed together,
In the middle of the pipe shaft (30), receiving portions (33, 35) facing the caulking portion (34) plastically deformed with the periphery of the mounting hole (22) interposed therebetween,
The pipe shaft (30) includes a thin small-diameter portion including the caulking portion (34) and a thick large-diameter portion, and the cross-sectional portion (33) at the boundary between the small-diameter portion and the large-diameter portion is defined as the pipe shaft (30). A pipe shaft mounting structure for a brake, wherein the receiving portion (33) is used .
[0008]
[2] The pipe shaft mounting structure for a brake according to [1], wherein a plurality of the small protrusions (23) are provided around the mounting hole (22) so as to be arranged at equal intervals.
[0012]
Next, the operation based on the above solution will be described.
According to the pipe shaft mounting structure for a brake according to the item [1], the mounting hole (22) for penetrating the pipe shaft (30) is formed in the base (21) of the operating lever (20), and the mounting hole ( A small protrusion (23) protruding from the reference surface by a small area is provided around 22).
[0013]
On the other hand, in the middle of the pipe shaft (30), there is provided a caulking portion (34) which is crushed over the entire circumference when pressed in the axial direction and spreads in an annular shape on the outside. Here, it is preferable to select a material so that the operation lever (20) has higher rigidity than the pipe shaft (30). The pipe shaft (30) is slightly shortened in length by the amount that the crimped portion (34) is crushed so as to spread outward after pressing.
[0014]
Then, the pipe shaft (30) is pressed in the axial direction in a state where the pipe shaft (30) is passed through the mounting hole (22) of the operation lever (20). At the time of pressing, the caulking portion (34) is positioned on the surface of the operation lever (20) on the side from which the small protrusion (23) protrudes. In this state, the pipe shaft (30) is pressed in the axial direction, and the caulking portion (34) plastically deformed bites the small protrusion (23) around the mounting hole (22).
[0015]
The small protrusion (23) protrudes by a slight area from the reference surface around the mounting hole (22). Accordingly, since the pressure is concentrated by a small area where the small protrusion (23) contacts the crushed caulking portion (34) at the beginning of pressing, the small protrusion (23) is caulked (34). Make sure to bite into. In this way, the pipe shaft (30) is integrally fixed to the mounting hole (22) of the operation lever (20) so as not to rotate.
[0016]
According to the caulking by the press as described above, the pipe shaft (30) can be easily and quickly attached to the base (21) of the operation lever (20) as compared with the conventional welding operation. Further, the attachment site is not transformed as in the case of welding, and sufficient attachment strength can be obtained.
Furthermore, since the receiving part (33, 35) which opposes the periphery of the attachment hole (22) with respect to the caulking part (34) which has been plastically deformed is provided in the middle of the pipe shaft (30), At this time, the pressure applied to the caulking portion (34) can be received, and the caulking can be reliably performed. Moreover, since the periphery of the mounting hole (22) is clamped by the caulking portion (34) and the receiving portions (33, 35) after pressing, the mounting strength can be further increased.
Here, with respect to the receiving portions (33, 35), the cross section (33) at the boundary between the small-diameter portion and the large-diameter portion of the pipe shaft (30) enables easy pressing.
[0017]
According to the pipe shaft mounting structure for a brake according to the item [2], a plurality of the small protrusions (23) are provided around the mounting hole (22) so as to be arranged at equal intervals, so that a sufficient mounting strength is ensured. be able to.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, various embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a first embodiment according to the present invention.
The brake according to the present embodiment is a foot-operated parking brake 10. However, the brake pipe mounting structure according to the present invention is not limited to a parking brake, and may be applied to a service brake or an auxiliary brake.
[0021]
As shown in FIG. 6, the foot-operated parking brake 10 supports a base portion 21 of an operation lever 20 on a base member 11 fixed on the vehicle body side so as to be swingable by a pipe shaft 30, and swings the operation lever 20. A pedal 27 is attached to a distal end portion 26 which is the end side. The brake 10 is configured to transmit its operating force to a brake body (not shown) by depressing the pedal 27.
[0022]
As shown in FIG. 1, the operating lever 20 has a narrow end extending from one end of a base portion 21 that extends in a planar shape, including a distal end portion 26, and is made of metal. A circular attachment hole 22 that pivotally supports the pipe shaft 30 is formed in the base portion 21. The inner diameter of the mounting hole 22 substantially matches the outer diameter of the small-diameter portion 31 of the pipe shaft 30 described below, and is set so that the pipe shaft 30 is closely fitted to the mounting hole 22.
[0023]
As shown in FIGS. 3 to 5, small projections 23, 23... Projecting from the reference plane S by a small area are provided around the mounting hole 22. Each small protrusion 23 is press-molded into a shape that extends slightly on the radiation centered on the attachment hole 22 and protrudes in a mountain shape from the reference surface S. In the present embodiment, a total of eight small protrusions 23 are provided at equal intervals, but the number is not limited to this number.
[0024]
As shown in FIG. 2, the pipe shaft 30 includes a thin small-diameter portion 31 and a thick large-diameter portion 32. In the middle of the small-diameter portion 31, there is provided a caulking portion 34 that is plastically deformed so that when the pipe shaft 30 is pressed in the axial direction, the pipe shaft 30 is crushed over the entire circumference and spread outwardly in an annular shape. A cross-sectional portion 33 at the boundary between the small-diameter portion 31 and the large-diameter portion 32 serves as a receiving portion that faces the caulking portion 34 that is plastically deformed with the periphery of the mounting hole 22 interposed therebetween.
[0025]
As shown in FIGS. 1 and 2, the pipe shaft 30 is pressed in the axial direction in a state where the pipe shaft 30 is passed through the base portion 21 of the operation lever 20, and the caulking portion 34 of the pipe shaft 30 is annularly expanded. By crushing in this manner, the pipe shaft 30 is fixed to the base 21 so as not to rotate. The material is selected so that the operation lever 20 has higher rigidity than the pipe shaft 30.
[0026]
Each small protrusion 23 around the mounting hole 22 is a part that bites the caulking part 34, and the small protrusion 23 bites into the caulking part 34 that is plastically deformed. Further, the periphery of the mounting hole 22 after pressing is firmly held by the caulking piece 34 and the cross-sectional portion 33. After pressing, the pipe shaft 30 is slightly shortened in length by the amount that the caulking portion 34 is crushed so as to spread outward.
[0027]
Further, on the periphery of the base portion 21 of the operation lever 20, a fixing portion 24 for attaching the sector tooth member 38, other stoppers 25, and the like are provided. On the other hand, a pedal 27 is fixed to the distal end portion 26. A pedal pad 28 is attached to the pedal 27. The pedal pad 28 is formed of, for example, a synthetic resin, and a non-slip groove 29a is provided on the tread surface 29 facing the operator's leg direction.
[0028]
Describing in detail the foot-operated parking brake 10, as shown in FIG. 6, a brake cable 37 that transmits a braking force is connected to the base portion 21 of the operation lever 20 via a connection bracket 36. In addition, a sector tooth member 38 is fixed to the base portion 21, and a claw member 40 that engages and locks with the sector tooth of the sector tooth member 38 is provided.
[0029]
In order to engage and disengage the claw end 41 of the claw member 40 with the sector tooth of the sector tooth member 38, a release member 46 having a presser 47 that presses the swing end 42 of the claw member 40, and a distal end side of the release member 46 A release mechanism 45 including a release cable 48 that is fastened and a release handle 49 that pulls the release cable 48 is provided.
[0030]
The claw member 40 having a claw end 41 that meshes with the sector teeth of the sector tooth member 38 is pivotally attached to the base member 11 by a pivot shaft 43, and the swing end that extends from the pivot shaft 43 in an arm shape. 42 faces the pressing member 47 of the release member 46 constituting the release mechanism 45.
[0031]
A spring 42 a that biases the claw member 40 in a direction in which the claw end 41 meshes with the sector teeth of the sector tooth member 38 is stretched between the swing end 42 and the base member 11. The release member 46 is pivotally supported by the base member 11 by a pivot shaft 46a. A pressing element 47 is formed in the vicinity of the pivot shaft 46a. A release cable 48 is fastened to the free end portion 46b. Yes.
[0032]
In addition, a buffer member 39 is provided between a substantially intermediate portion of the operation lever 20 and the pivot shaft 43. The buffer member 39 reduces the return force of the operation lever 20 to buffer the reaction when the operation lever 20 returns and reduces the impact, and is constituted by a pneumatic cylinder, for example.
[0033]
Next, attachment of the pipe shaft 30 will be described.
In order to attach the pipe shaft 30 to the base portion 21 of the operation lever 20, first, the small diameter portion 31 of the pipe shaft 30 is passed through the attachment hole 22 formed in the base portion 21. At this time, as shown in FIG. 2, the pipe shaft 30 is placed on the jig with the large-diameter portion 32 facing down, and the lower surface side around the mounting hole 22 is brought into contact with the cross-sectional portion 32 of the pipe shaft 30. Hold it in a state. The caulking portion 34 before plastic deformation is located just on the upper surface side around the mounting hole 22 (the side on which the small protrusion 23 protrudes).
[0034]
In this state, the pipe shaft 30 is pressed in the axial direction by directing a press to the upper end of the pipe shaft 30 on the small diameter portion 31 side. Then, as shown in FIG. 2, the caulking portion 34 is caulked, and the entire circumference of the small diameter portion 31 is crushed and plastically deformed so as to spread outwardly. The small protrusions 23 around the attachment hole 22 sufficiently bite into the caulking portion 34.
[0035]
Since each small protrusion 23 protrudes by a slight area from the reference surface S around the mounting hole 22, the area where the small protrusion 23 comes into contact with the crushed caulking portion 34 at the beginning of pressing is small. Only the pressure concentrates. Accordingly, each small protrusion 23 can be securely bited into the caulking portion 34. Further, the periphery of the mounting hole 22 is firmly sandwiched from both the front and back sides by the caulking portion 34 and the cross-sectional portion 33.
[0036]
As described above, the pipe shaft 30 is integrally fixed to the mounting hole 22 of the operation lever 20 so as not to rotate. According to the attachment structure of the pipe shaft 30 by such a press, the pipe shaft 30 can be easily and quickly attached to the base portion 21 of the operation lever 20 as compared with the conventional welding operation. Further, the attachment site does not change as in the case of welding, and sufficient attachment strength can be obtained.
[0037]
Hereinafter, the operation of the foot-operated parking brake 10 will be briefly described. As shown by the solid line in FIG. 6, when the operation lever 20 is in the release state before being depressed, the gap between the sector tooth of the sector tooth member 38 provided on the base 21 of the operation lever 20 and the claw end 41 of the claw member 40. There is no braking reaction force.
[0038]
When the operation lever 20 is swung by depressing the pedal, the brake cable 23 is drawn and braking force is generated. As the operating lever 20 swings, the sector tooth member 38 also moves, and the claw end 41 moves over the sector tooth of the sector tooth member 38 due to relative displacement with the claw member 40.
[0039]
When the pedal of the operating lever 20 is fully depressed and the force applied to the foot is loosened, the operating lever 20 tries to return, and the sector tooth of the sector tooth member 38 and the pawl end 41 of the pawl member 40 are engaged by receiving a braking reaction force. Then, the brake state in which the brake cable 23 is drawn is maintained.
[0040]
When releasing the brake, the release mechanism 45 rotates the claw member 40 by a small angle in a direction in which the claw end 41 is disengaged from the sector tooth of the sector tooth member 38. That is, when the release handle 49 is grasped and pulled, the release cable 48 is drawn and the release member 46 rotates.
[0041]
When the release member 46 rotates, the pressing member 47 pushes the swing end 42 of the claw member 40, and the claw member 40 rotates in a direction in which the claw end 41 is separated from the sector tooth of the sector tooth member 38. When the claw end 41 of the claw member 40 is disengaged from the sector tooth of the sector tooth member 38, the operation lever 20 swings in the return direction by the braking reaction force and returns to the release state, and the brake cable 23 is loosened to release the brake. .
[0042]
FIG. 7 shows a second embodiment according to the present invention.
In the present embodiment, the pipe shaft 30A is formed to have the same diameter over the entire length, and when the pipe shaft 30A is pressed in the axial direction, in addition to the caulking portion 34, the pipe shaft 30A is close to the caulking portion 34. A receiving portion 35 that is plastically deformed so as to spread in an annular shape is provided.
[0043]
The receiving portion 35 can receive the pressure applied to the caulking portion 34 during pressing, similarly to the cross-sectional portion 33 of the first embodiment, and can surely perform caulking. Moreover, since the periphery of the mounting hole 22 is clamped by the caulking portion 34 and the receiving portion 35 after pressing, the mounting strength can be further increased.
[0044]
Further, according to the receiving portion 35 of the present embodiment, the pipe shaft 30A can be formed to have the same diameter over the entire length thereof, so that the configuration of the pipe shaft 30A itself can be simplified.
Note that the pipe shaft mounting structure for a brake according to the present invention is not limited to the illustrated embodiments.
[0045]
【The invention's effect】
According to the pipe shaft mounting structure of the brake according to the present invention, the pipe shaft is pressed in the axial direction in a state in which the pipe shaft is passed through the mounting hole of the operation lever, and the caulked portion where the pipe shaft is plastically deformed, A small protrusion around the mounting hole is bitten, and the pipe shaft is fixed integrally with the operation lever mounting hole so that it cannot rotate . The plastic shaft is placed in the middle of the pipe shaft against the caulking portion that is plastically deformed. A receiving portion is provided opposite to the periphery of the mounting hole, and the pipe shaft is composed of a thin small diameter portion including the caulking portion and a thick large diameter portion, and the small diameter portion and the large diameter portion Since the cross-sectional portion of the boundary is the receiving portion , compared to conventional welding work, the pipe shaft can be easily and quickly attached to the base of the operation lever, and the attachment site is not transformed by welding, Operation lever with sufficient mounting strength It is possible to prevent reliably the idling of the pipe axis against.
[Brief description of the drawings]
FIG. 1 is a front view showing an operation lever of a brake according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a pipe shaft mounting structure for a brake according to the first embodiment of the present invention.
FIG. 3 is an enlarged view showing a mounting hole drilled in the operating lever of the brake according to the first embodiment of the present invention and a small protrusion around the mounting hole.
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a front view showing the entire brake according to the first embodiment of the present invention.
FIG. 7 is a sectional view showing a pipe shaft mounting structure for a brake according to a second embodiment of the present invention.
FIG. 8 is a perspective view showing a conventional pipe shaft mounting structure for a brake.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Foot-operated parking brake 11 ... Base member 20 ... Operation lever 21 ... Base part 22 ... Mounting hole 23 ... Small projection part 26 ... Tip part 27 ... Pedal 28 ... Pedal pad 30 ... Pipe shaft 33 ... Cross-section part 34 ... Covering part Type

Claims (2)

車体側にベース部材を固設し、該ベース部材に操作レバーの基部を、パイプ軸を介して揺動可能に支持して成り、前記操作レバーを揺動させて制動力を発生させるブレーキのパイプ軸取付構造において、
前記操作レバーの基部に、前記パイプ軸を貫通させる取付孔を穿設し、該取付孔の周囲に、その基準面より僅かな面積分だけ突出する小突起部を突設し、
前記パイプ軸の途中に、該パイプ軸を軸心方向にプレスした際、全周に亘り潰れて外側に環状に広がるよう塑性変形する被かしめ部を設け、
前記操作レバーの取付孔に前記パイプ軸を貫通させた状態で、パイプ軸を軸心方向にプレスし、パイプ軸の塑性変形した前記被かしめ部に、前記取付孔の周囲にある小突起部を食い込ませて、パイプ軸を操作レバーの取付孔に対し回転不能に一体に固設し、
前記パイプ軸の途中に、塑性変形した前記被かしめ部に対して前記取付孔の周囲を挟んで対向する受け部を設け、
前記パイプ軸は、前記被かしめ部を含む肉薄の小径部分と肉厚の大径部分とから成り、前記小径部分と大径部分との境の断面部を前記受け部としたことを特徴とするブレーキのパイプ軸取付構造。
A base member is fixed to the vehicle body, and a base of an operation lever is supported on the base member so as to be swingable via a pipe shaft. The brake pipe generates a braking force by swinging the control lever. In the shaft mounting structure,
At the base of the operation lever, a mounting hole for penetrating the pipe shaft is drilled, and a small protrusion protruding from the reference surface by a small area is provided around the mounting hole.
In the middle of the pipe shaft, when the pipe shaft is pressed in the axial direction, a caulking portion is provided that is plastically deformed so as to be crushed over the entire circumference and spread outward in an annular shape,
With the pipe shaft passing through the mounting hole of the operation lever, the pipe shaft is pressed in the axial direction, and a small protrusion around the mounting hole is formed in the caulked portion that is plastically deformed of the pipe shaft. The pipe shaft is fixed so that it cannot rotate with respect to the mounting hole of the operation lever .
In the middle of the pipe shaft, a receiving portion is provided opposite to the caulking portion plastically deformed with the periphery of the mounting hole interposed therebetween,
The pipe shaft is composed of a thin small-diameter portion including the caulking portion and a thick large-diameter portion, and a cross-sectional portion between the small-diameter portion and the large-diameter portion is the receiving portion. Brake pipe shaft mounting structure.
前記小突起部を、取付孔の周囲に等間隔に並ぶように複数設けたことを特徴とする請求項1記載のブレーキのパイプ軸取付構造。  The brake pipe shaft mounting structure according to claim 1, wherein a plurality of the small protrusions are provided so as to be arranged at equal intervals around the mounting hole.
JP18800897A 1997-07-14 1997-07-14 Brake pipe shaft mounting structure Expired - Fee Related JP4050807B2 (en)

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JP4961063B1 (en) 2011-01-24 2012-06-27 豊田鉄工株式会社 Pedal arm bearing member and pedal arm
JP4918620B1 (en) 2011-05-27 2012-04-18 豊田鉄工株式会社 Pedal arm bearing member, pedal arm, and pedal arm manufacturing method
JP2015010348A (en) * 2013-06-27 2015-01-19 株式会社ワイテック Steel strut
JP6716510B2 (en) * 2017-08-03 2020-07-01 豊田鉄工株式会社 Vehicle operation pedal device

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