JP3614492B2

JP3614492B2 - Reservoir

Info

Publication number: JP3614492B2
Application number: JP03039895A
Authority: JP
Inventors: 日出光春原; 孝義篠原
Original assignee: Nissin Kogyo Co Ltd
Current assignee: Nissin Kogyo Co Ltd
Priority date: 1995-02-20
Filing date: 1995-02-20
Publication date: 2005-01-26
Anticipated expiration: 2020-01-26
Also published as: JPH08216866A

Description

【０００１】
【産業上の利用分野】
本発明は、上部半体および下部半体が相互に溶着されて成るとともにタンデム型マスタシリンダのシリンダ体に結合される合成樹脂製のリザーバ本体に、上部半体の一部を天井壁とした油溜部が形成され、前記シリンダ体に設けられる前後一対のリリーフポートにそれぞれ通じて下部半体に設けられる一対の導油管の内端が、それらの内端の少なくとも一方を前記天井壁に対向させて油溜部の底部に開口され、油溜部内が、下部半体に設けられた隔壁で両導油管に個別に通じる一対の油溜室に区画されるリザーバに関する。
【０００２】
【従来の技術】
従来、かかるリザーバは、たとえば特開平５−２７０３８９号公報等により既に知られている。
【０００３】
【発明が解決しようとする課題】
かかるリザーバの隔壁は、タンデム型マスタシリンダに相互に独立して連なる一対の制動油圧回路の一方で作動油の漏出が生じたときに、他方の制動油圧回路側で制動液を確保するために油溜部内を一対の油溜室に区画するものである。一方、マスタシリンダでは、油圧室に前端を臨ませたピストンの制動作動開始時ならびに後退時に油圧室内の作動油の過剰分がリリーフポートからリザーバの油溜部に勢いよく戻されるものであり、上述のように一方の制動油圧回路で作動油の漏出が生じている状態で、作動油を確保している油溜室側でリリーフポートに連なる導油管の内端が天井壁に対向して開口している場合には、リリーフポートから導油管を経て油溜室内に噴出した作動油が天井壁に衝突して飛散し、飛沫が隔壁を越えて他方の油溜室に移動し、前記一方の油溜室内での作動液貯留量が低下することがある。
【０００４】
本発明は、かかる事情に鑑みてなされたものであり、作動油の天井壁からの反射飛沫が油溜室間で移動することを防止したリザーバを提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、請求項１の発明は、上部半体および下部半体が相互に溶着されて成るとともにタンデム型マスタシリンダのシリンダ体に結合される合成樹脂製のリザーバ本体に、上部半体の一部を天井壁とした油溜部が形成され、前記シリンダ体に設けられる前後一対のリリーフポートにそれぞれ通じて下部半体に設けられる一対の導油管の内端が、それらの内端の少なくとも一方を前記天井壁に対向させて油溜部の底部に開口され、油溜部内が、下部半体に設けられた隔壁で両導油管に個別に通じる一対の油溜室に区画されるリザーバにおいて、内端開口部を天井壁に対向させた導油管と隔壁との間の中間位置で上部半体には、天井壁から下方に突出する突壁が油溜部の両側部間にわたって設けられ、この突壁には、天井壁を上端縁とする開口部が設けられることを特徴とする。
【０００６】
また請求項２の発明は、上部半体および下部半体が相互に溶着されて成るとともにタンデム型マスタシリンダのシリンダ体に結合される合成樹脂製のリザーバ本体に、上部半体の一部を天井壁とした油溜部が形成され、その天井壁と角度をなして油溜部に連設されると共に上方に延びる給油筒部が上部半体に形成され、下部半体には、給油筒部の天井壁への連設部の下方に配置されて油溜部内を前後一対の油溜室に区画する隔壁が設けられ、シリンダ体に設けられる前後一対のリリーフポートにそれぞれ通じて下部半体に設けられる前後一対の導油管の内端が前後一対の油溜室の底部に個別に開口されると共に、その前部導油管の内端が給油筒部に、またその後部導油管の内端が天井壁にそれぞれ対向し、後部導油管と隔壁との中間位置で上部半体には、後部導油管から後部油溜室内に噴出して天井壁に衝突した作動油が隔壁側に飛散するのを阻止し得るように、該天井壁から下方に突出する突壁が油溜部の両側部間にわたって設けられることを特徴とする。
【０００７】
さらに請求項３の発明は、請求項２の前記特徴に加えて、天井壁を上端縁とする開口部が設けられることを特徴とする。
【０００８】
【作用】
上記請求項１の発明の構成によれば、天井壁からの反射飛沫が隔壁を越えることが突壁によって阻止される。しかも突壁に設けた開口部によって空気の流通が許容されることにより、突壁によって空気溜まりが生じることを回避可能となる。
【０００９】
また請求項２の発明の構成によれば、後部導油管と隔壁との中間位置で上部半体に設けた突壁により、後部導油管から後部油溜室内に噴出して天井壁に衝突した作動油が隔壁側に飛散するのを阻止できるため、天井壁からの反射飛沫が隔壁を越えることが阻止される。また、前部油溜室の上方に給油筒部が配置されると共に隔壁が給油筒部の天井壁への連設部の下方に配置されており、前部導油管から前部油溜室内に上方に噴出した作動油は、天井壁に衝突することなくそのまま落下して前部油溜室に戻るので、その作動油が後部油溜室側に移動することはない。
【００１０】
また請求項３の発明の構成によれば、突壁に設けた開口部によって空気の流通が許容されることにより、突壁によって空気溜まりが生じることを回避可能となる。
【００１１】
【実施例】
以下、図面により本発明の一実施例について説明する。
【００１２】
図１ないし図３は本発明の一実施例を示すものであり、図１はリザーバおよびマスタシリンダの平面図であって図２の１矢視図、図２は図１の２−２線断面図、図３は２の３−３線断面図である。
【００１３】
先ず図１および図２において、マスタシリンダＭは、自動車の２系統式油圧ブレーキ用としてタンデム型に構成されるものであり、そのシリンダ体１に設けられたシリンダ孔１ａには、フロントピストン２およびリヤピストン３が直列に摺動自在に嵌合され、シリンダ孔１ａの前端壁およびフロントピストン２間に前部油圧室４が形成され、また両ピストン２，３間に後部油圧室５が形成される。
【００１４】
前部油圧室４に通じる前部出力ポート６、ならびに後部油圧室５に通じる後部出力ポート７は、シリンダ体１の側面に開口されており、両出力ポート６，７には図示しない油圧導管がそれぞれ接続される。
【００１５】
シリンダ体１の後端には、リヤピストン３の後退限を規制するストップリング８が固定されており、フロントピストン２およびリヤピストン３間にはそれらのピストン２，３間の最大間隔を規制する最大間隔規制手段９が設けられる。また前部油圧室４にはフロントピストン２を後退方向に付勢する前部戻しばね１０が収納され、後部油圧室５にはリヤピストン３を後退方向に付勢する後部戻しばね１１が収納される。
【００１６】
フロントピストン２は、前後一対のピストン部２ａ，２ｂがロッド部２ｃを介して一体に連結されて成るものであり、前部ピストン部２ａには、該前部ピストン部２ａを前後に貫通する複数の連通孔１２…が穿設されており、それらの連通孔１２…を前方側から覆ってシリンダ孔１ａの内面に摺接するカップシール１３が前部ピストン部２ａに装着される。また後部ピストン部２ｂにはシリンダ孔１ａの内面に摺接するカップシール１４が装着される。
【００１７】
前後一対のピストン部２ａ，２ｂ間には補給油室１５が環状に形成されており、この補給油室１５に常時通じるサプライポート１６と、フロントピストン２が後退限に在るときにカップシール１３の直前で前部油圧室４に通じるリリーフポート１７とが、シリンダ体１の上壁に設けられる。
【００１８】
リヤピストン３は、図示しない負圧ブースタからの倍力を受けるピストンロッド１８を一体に有するものであり、該ピストンロッド１８はストップリング８を軸方向移動可能かつ液密に貫通して後方に延設される。而してリヤピストン３には、該リヤピストン３を前後に貫通する複数の連通孔１９…が穿設されており、それらの連通孔１９…を前方側から覆ってシリンダ孔１ａの内面に摺接するカップシール２０がリヤピストン３に装着される。
【００１９】
ピストンロッド１８の周囲でリヤピストン３およびストップリング８間には補給油室２１が環状に形成されており、補給油室２１に常時通じるサプライポート２２と、リヤピストン３が後退限に在るときにカップシール２０の直前で後部油圧室５に通じるリリーフポート２３とがシリンダ体１の上壁に設けられる。
【００２０】
リザーバＲのリザーバ本体２４は、下方を開放した合成樹脂製の上部半体２５と、上部を開放した合成樹脂製の下部半体２６とが、上部半体２５の下部開口端ならびに下部半体２６の上端開口部にそれぞれ設けられているフランジ２７，２８を相互に溶着させるようにして一体化されて成るものである。
【００２１】
このリザーバ本体２４には、上部半体２５の一部を天井壁２９ａとした油溜部２９が上部半体２５および下部半体２６間に形成され、天井壁２９ａはマスタシリンダＭの軸線とほぼ平行にしてほぼ平坦に形成される。また上部半体２５には、前記天井壁２９ａと角度をなして油溜部２９に連設されるとともに上方に延びる給油筒部３０と、給油筒部３０および天井壁２９ａ間に設けられる補強リブ３１とが形成される。
【００２２】
ところで、シリンダ体１の上部には、サプライポート１６およびリリーフポート１７を共通に連通させた前部導油孔３３と、サプライポート２２およびリリーフポート２３を共通に連通させた後部導油孔３４とが設けられており、リザーバ本体２４における下部半体２６に突設される前部導油管３５および後部導油管３６がシール部材３７，３８を介して前部導油孔３３および後部導油孔３４にそれぞれ嵌合され、両導油管３５，３６の内端は油溜部２９の底部に開口される。しかもリザーバ本体２４とシリンダ体１とは、それらの対向面に突設された連結腕３９，４０をボルト４１により連結することにより相互に結合される。
【００２３】
また下部半体２６の下部内面には、油溜部２９内の下部を前部油溜室４２および後部油溜室４３に区画する隔壁４４が一体に設けられており、前部油溜室４２にはサプライポート１６およびリリーフポート１７に通じる前部導油管３５の内端が開口され、後部油溜室４３には、サプライポート２２およびリリーフポート２３に通じる後部導油管３６の内端が、天井壁２９ａに対向して開口される。
【００２４】
図３を併せて参照して、後部油溜室４３内において後部導油管３６の内端開口部および隔壁４４間で後部導油管３６側に近接した位置で、下部半体２６の下部には邪魔板５５が突設されており、該邪魔板５５の両側端は下部半体２６の両側部に連設される。而して該邪魔板５５の中央部には比較的狭い流路５６が形成される。この邪魔板５５は、リザーバＲ内の油面が隔壁４４の上端まで低下したときに、振動、傾動による作動油の移動を極力抑える働きをするものであり、後部導油管３６への作動油の流入は流路５６により確保される。
【００２５】
また内端開口部を天井壁２９ａに対向させた後部導油管３６と隔壁４４との間の中間位置、この実施例では邪魔板５５および隔壁４４間で邪魔板５５に近接した位置において、上部半体２５には、給油筒部３０の軸線にほぼ沿うようにして天井壁２９ａから下方に突出する突壁５７が油溜部２９の両側部間にわたって設けられる。しかも突壁５７の幅方向に間隔をあけた２個所には、天井壁２９ａを上端縁として上下に延びて下端を開口したスリット状の開口部５８、５８が設けられる。
【００２６】
このリザーバＲは、マスタシリンダＭに連結された状態では、図２で示すように、給油筒部３０の軸線をほぼ鉛直とした姿勢となるものであり、給油筒部３０の上端開口部はキャップ４５により開閉可能に閉塞される。
【００２７】
給油筒部３０の油溜部２９への連設部における内面には、略十字状に形成された支持部４６の外端が一体に固設される。また給油筒部３０の内面にはその周方向に間隔をあけて給油筒部３０の軸線方向に延びる複数のガイド突部４７…が突設されており、それらのガイド突部４７…によって給油筒部３０の軸線に沿う昇降を案内されるフロート４８が給油筒部３０内に収納されており、フロート４８にはマグネット４８ａが内蔵される。さらに支持部４６には、前記フロート４８が所定レベルまで降下したときにスイッチング態様を変化させてリザーバ本体２４内の油面を検出するリードスイッチ４９が配設されており、該リードスイッチ４９に連なる一対のリード線５０，５１がリザーバ本体２４から外部に引き出される。
【００２８】
リザーバ本体２４の外方で両リード線５０，５１は被覆チューブ５２で被覆されており、被覆チューブ５２の中間部すなわちリード線５０，５１の中間部が補強リブ３１で弾発係止される。すなわち補強リブ３１には、該補強リブ３１の両側にそれぞれわずかに突出して略Ｕ字状に形成された厚肉の係止部５３が一体に設けられており、該係止部５３によって係止凹部５４が形成され、該係止凹部５４に、被覆チューブ５２の中間部を挿脱可能として一時的に弾発係止することが可能である。すなわちリザーバＲの輸送時、リザーバＲのマスタシリンダＭへの組付け時、リザーバＲをマスタシリンダＭに組付けた状態での車両への搭載組付け時等に、比較的長いリード線５０，５１が邪魔になることを回避するためにそれらのリード線５０，５１の中間部を補強リブ３１に一時的に係止することができる。
【００２９】
しかもリード線５０，５１を係止するための係止凹部５４が補強リブ３１に設けられることにより、リザーバ本体２４の外形形状が複雑化することはなく、リザーバ本体２４のうち上部半体２５の外形形状を単純化して上部半体２５の成形型の形状を単純化して型製作を容易とすることができる。また係止凹部５４近傍の補強リブ３１の強度低下が係止部５３が厚肉であることにより補われるとともに、リード線５０，５１の損傷を回避した保持が確実となる。
【００３０】
次にこの実施例の作用について説明すると、ブレーキ操作によりピストンロッド１８を前方に押動せしめると、フロントピストン２およびリヤピストン３が戻しばね１０，１１を圧縮しながら前進して前部および後部油圧室４，５に油圧を発生させ、それらの油圧が対応するブレーキ油圧回路に伝達されて各車輪ブレーキが制動作動せしめられる。而して両ピストン２，３の制動作動開始初期には、両ピストン２，３がリリーフポート１７，２３を通過するまでの加圧により両油圧室４，５内の作動油の一部はリリーフポート１７，２３から対応する油溜室４２，４３へと勢いよく戻される。
【００３１】
ピストンロッド１８への前方への押動力を解除したときには、両ピストン２，３が戻しばね１０，１１のばね力により後退し、両油圧室４，５が減圧される。この際、リザーバＲ内の作動油がサプライポート１６，２２、補給油室１５，２１、連通孔１２…，１９…およびカップシール１３，２０を経て両油圧室４，５に補給されるが、それらの作動油の過剰補給分は、リリーフポート１７，２３が開いたときに油溜室４２，４３へと勢いよく戻される。
【００３２】
ところで、前部油圧室４に連なるブレーキ油圧回路が破損して作動油の漏出が生じ、後部油溜室４３にのみ作動油が貯留されている場合を想定する。この場合、マスタシリンダＭの制動作動初期ならびにリヤピストン３の後退時には、上述のように後部油圧室５からの作動油の過剰分が、後部導油管３６から後部油溜室４３内に噴出するが、後部導油管３６の内端開口部に対向した天井壁２９ａに前記噴出作動油が衝突して飛散したとしても、後部導油管３６と隔壁４４との間で天井壁２９ａから下方に突出する突壁５７が上部半体２５に設けられており、天井壁２９ａとの衝突に伴う飛沫が隔壁４４側に飛散することが突壁５７によって阻止されるので、前記飛沫が隔壁４４を越えて前部油溜室４２側に飛散することが防止され、後部油溜室４３内で所定量の作動油を確保することができる。
【００３３】
なお後部油圧室５に連なるブレーキ油圧回路が破損して作動油の漏出が生じ、前部油溜室４２にのみ作動油が貯留されている場合には、マスタシリンダＭの制動作動初期ならびにリヤピストン３の後退時には、前部油圧室４からの作動油の過剰分が前部導油管３５から前部油溜室４２内に噴出するが、前部油溜室４２の上方には給油筒部３０が配置されるとともに隔壁４４が給油筒部３０の天井壁２９ａへの連設部の下方に配置されており、前部導油管３５から上方に噴出した作動油は天井壁２９ａに衝突することなくそのまま落下して前部油溜室４２に戻るので、作動油が後部油溜室４３側に移動することはない。
【００３４】
また突壁５７に、天井壁２９ａを上端縁とした開口部５８，５８が設けられており、それらの開口部５８，５８を空気が流通するようにして、突壁５７によって空気溜まりが生じることを防止することができる。
【００３５】
以上、本発明の実施例を説明したが、本発明は上記実施例に限定されるものではなく、特許請求の範囲に記載された本発明を逸脱することなく種々の設計変更を行うことが可能である。
【００３６】
たとえば、請求項１の発明では、前部導油管の内端開口部が天井壁に対向している場合には、前部導油管の内端開口部および隔壁間で上部半体に突壁が設けられればよく、また前部導油管および後部導油管の内端開口部が天井壁に対向している場合には、両導油管の内端開口部および隔壁間にそれぞれ位置する突壁が上部半体に設けられればよい。
【００３７】
【発明の効果】
以上のように請求項１の発明によれば、内端開口部を天井壁に対向させた導油管と隔壁との間の中間位置で上部半体には、天井壁から下方に突出する突壁が油溜部の両側部間にわたって設けられるので、導油管からの噴出作動油の天井壁への衝突による飛沫が隔壁を越えることを防止することができる。また特に突壁には、天井壁を上端縁とする開口部が設けられるので、突壁による空気溜まりが生じることを防止することができる。
【００３８】
また請求項２の発明によれば、後部導油管と隔壁との中間位置で上部半体に設けた突壁により、後部導油管から後部油溜室内に噴出して天井壁に衝突した作動油が隔壁側に飛散するのを阻止できるようにしたので、天井壁からの反射飛沫が隔壁を越えることが阻止され、後部油溜室内での所定量の作動油を確保することができる。また、前部油溜室の上方に給油筒部が配置されると共に隔壁が給油筒部の天井壁への連設部の下方に配置されており、前部導油管から前部油溜室内に上方に噴出した作動油は、天井壁に衝突することなくそのまま落下して前部油溜室に戻るので、その作動油が後部油溜室側に移動することはない。
【００３９】
また請求項３の発明によれば、請求項２の発明の前記効果に加えて、突壁には、天井壁を上端縁とする開口部が設けられるので、突壁による空気溜まりが生じることを防止することができる。
【図面の簡単な説明】
【図１】リザーバおよびマスタシリンダの平面図であって図２の１矢視図である。
【図２】図１の２−２線断面図である。
【図３】図２の３−３線拡大断面図である。
【符号の説明】
１・・・シリンダ体
１７，２３・・・リリーフポート
２４・・・リザーバ本体
２５・・・上部半体
２６・・・下部半体
２９・・・油溜部
２９ａ・・・天井壁
３０・・・給油筒部
３５，３６・・・導油管
４２，４３・・・前、後部油溜室
４４・・・隔壁
５７・・・突壁
５８・・・開口部
Ｍ・・・マスタシリンダ
Ｒ・・・リザーバ[0001]
[Industrial application fields]
The present invention provides a reservoir body made of a synthetic resin in which an upper half body and a lower half body are welded to each other and coupled to a cylinder body of a tandem master cylinder. Inner ends of a pair of oil guide pipes provided in the lower half through the pair of front and rear relief ports provided in the cylinder body, each having at least one of the inner ends opposed to the ceiling wall. The present invention relates to a reservoir that is opened at the bottom of the oil reservoir, and in which the oil reservoir is partitioned into a pair of oil reservoirs that individually communicate with both the oil guide pipes by a partition wall provided in the lower half.
[0002]
[Prior art]
Conventionally, such a reservoir is already known, for example, from JP-A-5-270389.
[0003]
[Problems to be solved by the invention]
The partition wall of the reservoir is used to secure the brake fluid on the other brake hydraulic circuit side when leakage of hydraulic oil occurs in one of the pair of brake hydraulic circuits that are independently connected to the tandem master cylinder. The inside of the reservoir is partitioned into a pair of oil reservoirs. On the other hand, in the master cylinder, when the braking operation of the piston facing the front end of the hydraulic chamber starts and when the piston moves backward, the excess hydraulic oil in the hydraulic chamber is returned from the relief port to the reservoir oil reservoir. As shown in the figure, when the hydraulic oil leaks in one of the braking hydraulic circuits, the inner end of the oil guide pipe connected to the relief port opens to the ceiling wall on the oil reservoir side where the hydraulic oil is secured. The hydraulic oil sprayed from the relief port through the oil guide pipe into the oil reservoir chamber collides with the ceiling wall and scatters, and the splash moves over the partition wall to the other oil reservoir chamber. The amount of hydraulic fluid stored in the reservoir may be reduced.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a reservoir in which reflected splashes of hydraulic oil from a ceiling wall are prevented from moving between oil reservoir chambers.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is characterized in that the upper half and the lower half are welded to each other and the reservoir body made of a synthetic resin is joined to the cylinder body of the tandem master cylinder. An oil reservoir is formed with a part of the half as a ceiling wall, and the inner ends of the pair of oil guide pipes provided in the lower half through the pair of front and rear relief ports provided in the cylinder body, At least one of the ends is opposed to the ceiling wall and is opened at the bottom of the oil reservoir, and the oil reservoir is partitioned into a pair of oil reservoirs that individually communicate with the oil guide pipes with a partition wall provided in the lower half. In the reservoir, the upper half of the upper half is located between the oil guide pipe with the inner end opening facing the ceiling wall and the partition wall, and a protruding wall that protrudes downward from the ceiling wall extends between both sides of the oil reservoir. It provided, on the protruding wall is, the ceiling wall Wherein the opening to the edge is provided.
[0006]
According to a second aspect of the present invention, an upper half and a lower half are welded to each other, and a synthetic resin reservoir body coupled to a cylinder body of a tandem master cylinder is attached to a part of the upper half. An oil reservoir portion is formed as a wall, and an oil supply cylinder portion that is connected to the oil reservoir portion at an angle with the ceiling wall and extends upward is formed in the upper half body, and an oil supply cylinder portion is formed in the lower half body A partition wall is provided below the connecting portion to the ceiling wall and partitions the oil reservoir portion into a pair of front and rear oil reservoir chambers, and communicates with a pair of front and rear relief ports provided in the cylinder body, respectively. The inner ends of the pair of front and rear oil guide pipes provided are individually opened at the bottoms of the pair of front and rear oil reservoirs, the inner end of the front oil guide pipe is at the oil supply cylinder, and the inner end of the rear oil guide pipe is Opposite to the ceiling wall and above the middle position between the rear oil conduit and the bulkhead The half body has a protruding wall that protrudes downward from the ceiling wall so as to prevent the hydraulic oil that has been jetted from the rear oil guide pipe into the rear oil sump chamber and collided with the ceiling wall from scattering to the partition wall side. It is provided over both sides of the reservoir.
[0007]
Furthermore, the invention of claim 3 is characterized in that, in addition to the feature of claim 2, an opening having a ceiling wall as an upper edge is provided.
[0008]
[Operation]
According to the configuration of the first aspect of the invention, the protruding wall prevents reflection splashes from the ceiling wall from exceeding the partition wall. In addition, since the air flow is allowed by the opening provided in the protruding wall, it is possible to avoid the occurrence of air accumulation by the protruding wall.
[0009]
According to the second aspect of the present invention, the operation of jetting from the rear oil guide pipe into the rear oil reservoir chamber and colliding with the ceiling wall by the projecting wall provided in the upper half at an intermediate position between the rear oil guide pipe and the partition wall. Since oil can be prevented from splashing toward the partition wall, reflection splashes from the ceiling wall are prevented from passing over the partition wall. In addition, an oil supply cylinder portion is disposed above the front oil reservoir chamber, and a partition wall is disposed below the connecting portion to the ceiling wall of the oil supply cylinder portion, and from the front oil guide pipe to the front oil reservoir chamber. Since the hydraulic oil jetted upward falls as it is without colliding with the ceiling wall and returns to the front oil reservoir, the hydraulic oil does not move to the rear oil reservoir.
[0010]
Further, according to the configuration of the invention of claim 3, it is possible to avoid the occurrence of air accumulation by the protruding wall by allowing the air to flow through the opening provided in the protruding wall.
[0011]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0012]
1 to 3 show an embodiment of the present invention. FIG. 1 is a plan view of a reservoir and a master cylinder as viewed from the direction of arrow 1 in FIG. 2, and FIG. 2 is a sectional view taken along line 2-2 in FIG. FIG. 3 is a cross-sectional view taken along line 3-3.
[0013]
First, in FIG. 1 and FIG. 2, the master cylinder M is configured in a tandem type for a two-system hydraulic brake of an automobile. The cylinder hole 1a provided in the cylinder body 1 has a front piston 2 and The rear piston 3 is slidably fitted in series, a front hydraulic chamber 4 is formed between the front end wall of the cylinder hole 1 a and the front piston 2, and a rear hydraulic chamber 5 is formed between the pistons 2 and 3. The
[0014]
A front output port 6 that communicates with the front hydraulic chamber 4 and a rear output port 7 that communicates with the rear hydraulic chamber 5 are opened in the side surface of the cylinder body 1. Each is connected.
[0015]
A stop ring 8 that restricts the backward limit of the rear piston 3 is fixed to the rear end of the cylinder body 1, and the maximum distance between the pistons 2 and 3 is restricted between the front piston 2 and the rear piston 3. Maximum interval restriction means 9 is provided. The front hydraulic chamber 4 houses a front return spring 10 that biases the front piston 2 in the backward direction, and the rear hydraulic chamber 5 houses a rear return spring 11 that biases the rear piston 3 in the backward direction. The
[0016]
The front piston 2 is formed by integrally connecting a pair of front and rear piston portions 2a and 2b via a rod portion 2c. The front piston portion 2a includes a plurality of front and rear piston portions 2a penetrating forward and backward. Are formed, and a cup seal 13 is mounted on the front piston portion 2a so as to cover the communication holes 12 from the front side and slide in contact with the inner surface of the cylinder hole 1a. A cup seal 14 is mounted on the rear piston portion 2b so as to be in sliding contact with the inner surface of the cylinder hole 1a.
[0017]
A replenishing oil chamber 15 is formed in an annular shape between the pair of front and rear piston portions 2a and 2b. A supply port 16 that always communicates with the replenishing oil chamber 15 and a cup seal 13 when the front piston 2 is in the retreat limit. A relief port 17 that communicates with the front hydraulic chamber 4 immediately before is provided on the upper wall of the cylinder body 1.
[0018]
The rear piston 3 integrally includes a piston rod 18 that receives a boost from a negative pressure booster (not shown). The piston rod 18 extends axially through the stop ring 8 in a liquid-tight manner and extends backward. Established. Thus, the rear piston 3 has a plurality of communication holes 19 penetrating the rear piston 3 in the front-rear direction. The communication holes 19 are covered from the front side and slid on the inner surface of the cylinder hole 1a. A cup seal 20 in contact with the rear piston 3 is attached.
[0019]
A replenishment oil chamber 21 is formed in an annular shape around the piston rod 18 between the rear piston 3 and the stop ring 8, and the supply port 22 that always communicates with the replenishment oil chamber 21 and the rear piston 3 is in the retreat limit. A relief port 23 communicating with the rear hydraulic chamber 5 immediately before the cup seal 20 is provided on the upper wall of the cylinder body 1.
[0020]
The reservoir main body 24 of the reservoir R is composed of a synthetic resin upper half 25 whose lower part is opened and a synthetic resin lower half 26 whose upper part is opened. The flanges 27 and 28 provided at the upper end openings are integrated so as to be welded to each other.
[0021]
In the reservoir body 24, an oil reservoir 29 having a part of the upper half 25 as a ceiling wall 29a is formed between the upper half 25 and the lower half 26, and the ceiling wall 29a is substantially aligned with the axis of the master cylinder M. They are formed in parallel and almost flat. The upper half 25 is connected to the oil reservoir 29 at an angle with the ceiling wall 29a and extends upward, and a reinforcing rib provided between the oil supply cylinder 30 and the ceiling wall 29a. 31 is formed.
[0022]
By the way, in the upper part of the cylinder body 1, a front oil guide hole 33 in which the supply port 16 and the relief port 17 are communicated in common, and a rear oil guide hole 34 in which the supply port 22 and the relief port 23 are communicated in common. The front oil guide pipe 35 and the rear oil guide pipe 36 projecting from the lower half 26 of the reservoir body 24 are provided with the front oil guide hole 33 and the rear oil guide hole 34 through the seal members 37 and 38, respectively. And the inner ends of the oil guide pipes 35 and 36 are opened at the bottom of the oil reservoir 29. In addition, the reservoir body 24 and the cylinder body 1 are coupled to each other by connecting the connecting arms 39 and 40 projecting from the opposing surfaces with bolts 41.
[0023]
A partition wall 44 that divides the lower portion of the oil reservoir 29 into a front oil reservoir chamber 42 and a rear oil reservoir chamber 43 is integrally provided on the lower inner surface of the lower half body 26. The inner end of the front oil guide pipe 35 communicating with the supply port 16 and the relief port 17 is opened, and the inner end of the rear oil guide pipe 36 communicating with the supply port 22 and the relief port 23 is provided in the rear oil reservoir 43. The wall 29a is opened facing.
[0024]
Referring also to FIG. 3, in the rear oil reservoir 43, a position close to the rear oil guide pipe 36 side between the inner end opening of the rear oil guide pipe 36 and the partition wall 44, there is an obstacle in the lower half 26. A plate 55 is projected, and both side ends of the baffle plate 55 are connected to both side portions of the lower half 26. Thus, a relatively narrow channel 56 is formed in the central portion of the baffle plate 55. The baffle plate 55 functions to suppress the movement of the hydraulic oil due to vibration and tilting as much as possible when the oil level in the reservoir R drops to the upper end of the partition wall 44. Inflow is ensured by the flow path 56.
[0025]
Further, in the middle position between the rear oil guide pipe 36 with the inner end opening facing the ceiling wall 29a and the partition wall 44, in this embodiment, between the baffle plate 55 and the partition wall 44, the upper half-half is located. The body 25 is provided with a projecting wall 57 projecting downward from the ceiling wall 29 a so as to substantially extend along the axis of the oil supply cylinder portion 30 between both sides of the oil reservoir portion 29. In addition, slit-like openings 58 and 58 are provided at two locations spaced apart in the width direction of the protruding wall 57, extending vertically with the ceiling wall 29a as the upper edge and opening the lower end.
[0026]
When the reservoir R is connected to the master cylinder M, as shown in FIG. 2, the reservoir R assumes a posture in which the axis of the oil supply cylinder portion 30 is substantially vertical, and the upper end opening of the oil supply cylinder portion 30 is a cap. It is closed by 45 so that it can be opened and closed.
[0027]
An outer end of a support portion 46 formed in a substantially cross shape is integrally fixed to an inner surface of the oil supply cylinder portion 30 connected to the oil reservoir portion 29. A plurality of guide protrusions 47 extending in the axial direction of the oil supply cylinder part 30 are provided on the inner surface of the oil supply cylinder part 30 at intervals in the circumferential direction thereof, and the oil supply cylinders are formed by the guide protrusions 47. A float 48 guided to move up and down along the axis of the portion 30 is accommodated in the oil supply cylinder portion 30, and a magnet 48 a is incorporated in the float 48. Further, the support 46 is provided with a reed switch 49 for detecting the oil level in the reservoir body 24 by changing the switching mode when the float 48 is lowered to a predetermined level. A pair of lead wires 50 and 51 are drawn out from the reservoir body 24 to the outside.
[0028]
Both lead wires 50 and 51 are covered with a covering tube 52 outside the reservoir body 24, and an intermediate portion of the covering tube 52, that is, an intermediate portion of the lead wires 50 and 51 is elastically locked by the reinforcing rib 31. That is, the reinforcing rib 31 is integrally provided with a thick locking portion 53 that protrudes slightly on both sides of the reinforcing rib 31 and is formed in a substantially U shape. A concave portion 54 is formed, and the intermediate portion of the covering tube 52 can be inserted into and removed from the locking concave portion 54 to be temporarily elastically locked. That is, when transporting the reservoir R, when assembling the reservoir R to the master cylinder M, when mounting the reservoir R on the vehicle with the reservoir R assembled to the master cylinder M, etc., the relatively long lead wires 50, 51 In order to avoid the interference, the intermediate portions of the lead wires 50 and 51 can be temporarily locked to the reinforcing rib 31.
[0029]
In addition, since the locking recesses 54 for locking the lead wires 50 and 51 are provided in the reinforcing rib 31, the outer shape of the reservoir body 24 is not complicated, and the upper half 25 of the reservoir body 24 is not complicated. It is possible to simplify the outer shape and simplify the shape of the mold of the upper half body 25 to facilitate mold manufacture. Further, the strength reduction of the reinforcing rib 31 in the vicinity of the locking recess 54 is compensated by the fact that the locking portion 53 is thick, and the holding while avoiding damage to the lead wires 50 and 51 is ensured.
[0030]
Next, the operation of this embodiment will be described. When the piston rod 18 is pushed forward by a brake operation, the front piston 2 and the rear piston 3 move forward while compressing the return springs 10 and 11 to move forward and rear hydraulic pressures. Oil pressure is generated in the chambers 4 and 5, and the oil pressure is transmitted to the corresponding brake oil pressure circuit to brake each wheel brake. Thus, at the beginning of the braking operation of both pistons 2 and 3, part of the hydraulic oil in both hydraulic chambers 4 and 5 is relieved by pressurization until both pistons 2 and 3 pass through relief ports 17 and 23. The ports 17 and 23 are returned to the corresponding oil sump chambers 42 and 43 vigorously.
[0031]
When the forward pushing force to the piston rod 18 is released, both pistons 2 and 3 are retracted by the spring force of the return springs 10 and 11, and both hydraulic chambers 4 and 5 are decompressed. At this time, the hydraulic oil in the reservoir R is supplied to both the hydraulic chambers 4 and 5 through the supply ports 16 and 22, the supply oil chambers 15 and 21, the communication holes 12 to 19 and the cup seals 13 and 20. The excess replenishment of the hydraulic oil is vigorously returned to the oil reservoirs 42 and 43 when the relief ports 17 and 23 are opened.
[0032]
By the way, it is assumed that the brake hydraulic circuit connected to the front hydraulic chamber 4 is broken and hydraulic oil leaks out, and the hydraulic oil is stored only in the rear oil reservoir 43. In this case, at the beginning of the braking operation of the master cylinder M and when the rear piston 3 is retracted, the excess hydraulic oil from the rear hydraulic chamber 5 is ejected from the rear oil guide pipe 36 into the rear oil reservoir 43 as described above. Even if the jetting hydraulic oil collides with and scatters on the ceiling wall 29a facing the inner end opening of the rear oil guide pipe 36, the protrusion protruding downward from the ceiling wall 29a between the rear oil guide pipe 36 and the partition wall 44. Since the wall 57 is provided on the upper half body 25 and splashes caused by the collision with the ceiling wall 29a are prevented from scattering to the partition wall 44 side, the spray wall 57 prevents the splashes from passing through the partition wall 44. Scattering to the oil reservoir chamber 42 side is prevented, and a predetermined amount of hydraulic oil can be secured in the rear oil reservoir chamber 43.
[0033]
If the brake hydraulic circuit connected to the rear hydraulic chamber 5 is damaged and hydraulic fluid leaks, and hydraulic fluid is stored only in the front oil reservoir 42, the braking operation of the master cylinder M and the rear piston are performed. 3, the excess hydraulic oil from the front hydraulic chamber 4 is ejected from the front oil guide pipe 35 into the front oil reservoir chamber 42, but above the front oil reservoir chamber 42, the oil supply cylinder portion 30. And the partition wall 44 is disposed below the connecting portion of the oil supply cylinder portion 30 to the ceiling wall 29a , and the hydraulic oil sprayed upward from the front oil guide pipe 35 does not collide with the ceiling wall 29a. Since it falls as it is and returns to the front oil sump chamber 42, the hydraulic oil does not move to the rear oil sump chamber 43 side.
[0034]
Further, the protruding wall 57 is provided with openings 58 and 58 having the ceiling wall 29a as the upper edge, and air is generated by the protruding wall 57 so that air flows through the openings 58 and 58. Can be prevented.
[0035]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.
[0036]
For example, the protruding wall in the first aspect of the present invention, when the inner end opening of the front oil guide tube that has to face the ceiling wall, the upper half body between the inner end opening and the partition wall of the front oil guide tube When the inner end openings of the front oil guide pipe and the rear oil guide pipe are opposed to the ceiling wall, the projecting walls located between the inner end openings of the both oil guide pipes and the partition walls are respectively provided. It may be provided in the upper half.
[0037]
【The invention's effect】
As described above, according to the first aspect of the present invention, the upper half of the upper half body protrudes downward from the ceiling wall at an intermediate position between the oil guide pipe and the partition wall with the inner end opening facing the ceiling wall. Is provided over both sides of the oil reservoir, so that splashing of the hydraulic fluid ejected from the oil guide pipe to the ceiling wall can be prevented from passing over the partition wall. In particular, since the projecting wall is provided with an opening having the ceiling wall as the upper edge, it is possible to prevent air from being accumulated by the projecting wall.
[0038]
According to the second aspect of the present invention, the hydraulic oil that has been ejected from the rear oil guide pipe into the rear oil sump chamber and collided with the ceiling wall by the projecting wall provided in the upper half at an intermediate position between the rear oil guide pipe and the partition wall is provided. Since the scattering to the partition wall side can be prevented, the reflection splash from the ceiling wall is prevented from passing over the partition wall, and a predetermined amount of hydraulic oil in the rear oil reservoir can be secured. In addition, an oil supply cylinder portion is disposed above the front oil reservoir chamber, and a partition wall is disposed below the connecting portion to the ceiling wall of the oil supply cylinder portion, and from the front oil guide pipe to the front oil reservoir chamber. Since the hydraulic oil jetted upward falls as it is without colliding with the ceiling wall and returns to the front oil reservoir, the hydraulic oil does not move to the rear oil reservoir.
[0039]
Further, according to the invention of claim 3, in addition to the effect of the invention of claim 2 , the projecting wall is provided with the opening having the ceiling wall as the upper edge, so that an air pocket is generated by the projecting wall. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a plan view of a reservoir and a master cylinder, and is a view taken in the direction of an arrow 1 in FIG.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
3 is an enlarged cross-sectional view taken along line 3-3 in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylinder body 17, 23 ... Relief port 24 ... Reservoir main body 25 ... Upper half body 26 ... Lower half body 29 ... Oil reservoir 29a ... Ceiling wall
30 ... Oil supply cylinders 35, 36 ... Oil guide pipes 42, 43 ... Front and rear oil reservoirs 44 ... Partition 57 ... Projection wall 58 ... Opening M ... Master cylinder R ... Reservoir

Claims

The upper half (25) and the lower half (26) are welded to each other, and the synthetic resin reservoir body (24) coupled to the cylinder body (1) of the tandem master cylinder (M) An oil reservoir (29) having a part of the half (25) as a ceiling wall (29a) is formed, and communicates with a pair of front and rear relief ports (17, 23) provided in the cylinder body (1). The inner ends of the pair of oil guide pipes (35, 36) provided on the half body (26) are opened at the bottom of the oil reservoir (29) with at least one of the inner ends opposed to the ceiling wall (29a). The oil reservoir (29) is partitioned into a pair of oil reservoirs (42, 43) that individually communicate with the oil guide pipes (35, 36) by a partition wall (44) provided in the lower half (26). In the reservoir to be
The upper half (25) projects downward from the ceiling wall (29a) at an intermediate position between the oil guide pipe (36) and the partition wall (44) with the inner end opening facing the ceiling wall (29a). A protruding wall (57) is provided between both side portions of the oil reservoir (29), and an opening (58) having a ceiling wall (29a) as an upper edge is provided in the protruding wall (57). And reservoir.

The upper half (25) and the lower half (26) are welded to each other, and the synthetic resin reservoir body (24) coupled to the cylinder body (1) of the tandem master cylinder (M) An oil reservoir (29) having a part of the half (25) as a ceiling wall (29a) is formed, and is connected to the oil reservoir (29) at an angle with the ceiling wall (29a) and upward. The upper half (25) is formed in the upper half (25), and the lower half (26) is disposed below the connecting portion to the ceiling wall (29a) of the upper half (26). A partition wall (44) dividing the oil reservoir (29) into a pair of front and rear oil reservoir chambers (42, 43) is provided, and a pair of front and rear relief ports (17, 23) provided in the cylinder body (1) are provided. A pair of front and rear oil guide pipes (35, 36) provided in the lower half (26) through each of them The inner ends are individually opened at the bottoms of the pair of front and rear oil reservoirs (42, 43), and the inner ends of the front oil guide pipes (35) are connected to the oil supply cylinder part (30) and the rear oil guide pipes ( 36) are opposed to the ceiling wall (29a), and the upper half (25) is located between the rear oil guide pipe (36) and the partition wall (44), and the rear oil guide pipe (36) to the rear oil. A protruding wall projecting downward from the ceiling wall (29a) so as to prevent the hydraulic oil that has been jetted into the reservoir chamber (43) and collided with the ceiling wall (29a) from being scattered to the partition wall (44) side. A reservoir characterized in that (57) is provided between both sides of the oil reservoir (29).

The reservoir according to claim 2 , wherein the projecting wall (57) is provided with an opening (58) having a ceiling wall (29a) as an upper edge.