JP2002255022A - Negative pressure booster - Google Patents
Negative pressure boosterInfo
- Publication number
- JP2002255022A JP2002255022A JP2001059527A JP2001059527A JP2002255022A JP 2002255022 A JP2002255022 A JP 2002255022A JP 2001059527 A JP2001059527 A JP 2001059527A JP 2001059527 A JP2001059527 A JP 2001059527A JP 2002255022 A JP2002255022 A JP 2002255022A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- negative pressure
- piston
- booster
- valve cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Braking Systems And Boosters (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，自動車のブレーキ
マスタシリンダの倍力作動のために用いられる負圧ブー
スタに関し，特に，ブースタシェルに，その内部を負圧
源に連なる前側の負圧室と後側の作動室とに区画するブ
ースタピストンを収容し，このブースタピストンに連設
される弁筒に，この弁筒に前後方向摺動自在に嵌合する
弁ピストンと，この弁ピストンに前端部を連結する入力
杆と，弁ピストン及び弁筒間で入力杆の前後動に応じて
作動室を負圧室と大気とに連通切換えする制御弁と，弁
筒に，それを直径方向に貫通すると共に弁ピストンの頸
部を跨いで取り付けられ，ブースタシェルに形成された
第１ストッパに当接して弁筒の後退限を規定し，また前
記頸部の前端に連なる第２ストッパを受け止めて弁筒に
対する弁ピストンの後退限を規定する，一対の脚片から
なる二股状のキー部材とを備える負圧ブースタの改良に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative pressure booster used for boosting operation of a brake master cylinder of an automobile, and more particularly, to a booster shell having a front negative pressure chamber connected to a negative pressure source. A booster piston which is partitioned into a rear working chamber is housed therein. A valve piston connected to the booster piston is fitted to the valve cylinder so as to be slidable in the front-rear direction. And a control valve for switching the working chamber between the negative pressure chamber and the atmosphere in accordance with the forward and backward movements of the input rod between the valve piston and the valve cylinder, and diametrically penetrating the valve cylinder. A valve stopper is mounted across the neck of the valve piston and abuts against a first stopper formed on the booster shell to define the retreat limit of the valve cylinder. Against valve piston Defining a retraction limit to an improvement of the vacuum booster and a bifurcated key member consisting of a pair of leg.
【０００２】[0002]
【従来の技術】かゝる負圧ブースタは，例えば実開昭６
３−３７４６４号公報に開示されているように，既に知
られている。2. Description of the Related Art Such a negative pressure booster is disclosed in, for example,
It is already known as disclosed in JP-A-3-37464.
【０００３】上記公報に開示された負圧ブースタでは，
キー部材の抜け止めのために，弁筒に，キー部材の両脚
片の先端間に進入する突出部を形成すると共に，この突
出部に係合する突起を両脚片の先端に形成している。In the negative pressure booster disclosed in the above publication,
In order to prevent the key member from coming off, a protrusion is formed on the valve cylinder between the ends of the two leg pieces of the key member, and a projection that engages with the protrusion is formed on the tip of the two leg pieces.
【０００４】[0004]
【発明が解決しようとする課題】上記のように，キー部
材の抜け止めのために，弁筒に，キー部材の両脚片の先
端間に進入する突出部を特別に形成するものでは，弁筒
の構造が複雑化して，その成形が困難となる。As described above, in order to prevent the key member from coming off, a specially formed protruding portion which is inserted between the tips of both leg pieces of the key member is formed on the valve cylinder. The structure becomes complicated and its molding becomes difficult.
【０００５】本発明は，かゝる事情に鑑みてなされたも
ので，弁筒の構造を複雑にすることなく，二股状のキー
部材を弁筒の定位置に確実に保持し得るようにした，前
記負圧ブースタを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is capable of securely holding a forked key member at a fixed position of a valve cylinder without complicating the structure of the valve cylinder. , It is an object to provide the negative pressure booster.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に，本発明は，ブースタシェルに，その内部を負圧源に
連なる前側の負圧室と後側の作動室とに区画するブース
タピストンを収容し，このブースタピストンに連設され
る弁筒に，この弁筒に前後方向摺動自在に嵌合する弁ピ
ストンと，この弁ピストンに前端部を連結する入力杆
と，弁ピストン及び弁筒間で入力杆の前後動に応じて作
動室を負圧室と大気とに連通切換えする制御弁と，弁筒
に，それを直径方向に貫通すると共に弁ピストンの頸部
を跨いで取り付けられ，ブースタシェルに形成された第
１ストッパに当接して弁筒の後退限を規定し，また前記
頸部の前端に連なる第２ストッパを受け止めて弁筒に対
する弁ピストンの後退限を規定する，一対の脚片からな
る二股状のキー部材とを備える負圧ブースタにおいて，
前記一対の脚片の互いに反対方向を向く外側面に，弁筒
の内周面に対向する位置決め凸部を形成した第１の特徴
する。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a booster piston having a booster shell, the interior of which is divided into a front negative pressure chamber connected to a negative pressure source and a rear working chamber. And a valve piston connected to the booster piston, the valve piston being slidably fitted in the valve cylinder in the front-rear direction, an input rod connecting a front end to the valve piston, a valve piston and a valve. A control valve that switches the working chamber between the negative pressure chamber and the atmosphere in accordance with the forward and backward movement of the input rod between the cylinders, and a control valve that penetrates the valve cylinder in the diameter direction and is mounted across the neck of the valve piston. A first stopper formed on the booster shell to define a retraction limit of the valve cylinder, and a second stopper connected to the front end of the neck to define a retraction limit of the valve piston relative to the valve cylinder. Bifurcated key member made of leg pieces In the negative pressure booster comprising,
A first feature is that a positioning projection is formed on an outer surface of the pair of leg pieces facing in opposite directions to face an inner peripheral surface of the valve cylinder.
【０００７】尚，前記第１ストッパは，本発明の後述す
る実施例における係止環９に対応し，前記第２ストッパ
はストッパ面１９ａに対応する。The first stopper corresponds to a locking ring 9 in an embodiment of the present invention described later, and the second stopper corresponds to a stopper surface 19a.
【０００８】この第１の特徴によれば，キー部材の両脚
片の位置決め凸部と弁筒の内周面との当接により，キー
部材を弁筒の定位置に保持することができ，したがって
弁筒の構造を特別複雑化しないで済み，その成形を容易
に行うことができる。According to the first feature, the key member can be held at the fixed position of the valve cylinder by the contact between the positioning projections of both leg pieces of the key member and the inner peripheral surface of the valve cylinder. The structure of the valve cylinder does not need to be particularly complicated, and the molding can be easily performed.
【０００９】また本発明は，第１の特徴に加えて，前記
位置決め凸部を弁筒の内周面に嵌合したことを第２の特
徴する。The present invention is characterized in that, in addition to the first feature, the positioning projection is fitted to the inner peripheral surface of the valve cylinder.
【００１０】この第２の特徴によれば，キー部材を弁筒
の定位置にガタを無く保持することができて，振動騒音
の発生を防ぐことができる。[0010] According to the second feature, the key member can be held at the fixed position of the valve cylinder without play, and the generation of vibration noise can be prevented.
【００１１】さらに本発明は，第２の特徴に加えて，前
記位置決め凸部の弁筒内周面との嵌合位置を超えてキー
部材が弁筒に押入されると，前記頸部の外周面に当接し
て両脚片間を開くカム面を両脚片の相対向する内側面に
形成したことを第３の特徴する。[0011] Further, in addition to the second feature, the present invention is characterized in that when the key member is pushed into the valve cylinder beyond the position where the positioning convex portion is fitted to the inner peripheral surface of the valve cylinder, the outer periphery of the neck portion is provided. A third feature is that a cam surface which abuts on the surface and opens between the two leg pieces is formed on the opposing inner surfaces of the two leg pieces.
【００１２】この第３の特徴によれば，もし，キー部材
が上記嵌合位置を越えて弁筒に押し込まれようとする
と，カム面が頸部の外周面により押し広げられ，それに
伴い両脚片が位置決め凸部を軸方向溝の内周面に強く押
圧することになり，その結果，キー部材の前記定位置か
らの行き過ぎを確実に防ぐことができる。According to the third feature, if the key member is pushed into the valve cylinder beyond the fitting position, the cam surface is pushed open by the outer peripheral surface of the neck portion, and accordingly the two leg pieces are pushed. Will strongly press the positioning protrusion against the inner peripheral surface of the axial groove, and as a result, it is possible to reliably prevent the key member from going too far from the fixed position.
【００１３】[0013]
【実施例の形態】本発明の実施の形態を，添付図面に示
す本発明の実施例に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.
【００１４】図１は本発明に係るシングル型負圧ブース
タを入力杆の休止状態で示す縦断面図，図２は図１の２
部拡大図（図３の２−２線断面図），図３は図２の３−
３線断面図，図４は図３の４−４線断面図，図５は図３
の５−５線断面で示す，倍力作用説明図，図６は図５に
対応した倍力解除過程説明図である。FIG. 1 is a longitudinal sectional view showing a single type negative pressure booster according to the present invention in a state where an input rod is at rest, and FIG.
FIG. 3 is an enlarged view of a part (a sectional view taken along line 2-2 in FIG. 3), and FIG.
3 is a cross-sectional view of FIG. 3, FIG. 4 is a cross-sectional view of FIG.
5 is a sectional view taken along line 5-5 of FIG. 5, and FIG. 6 is an explanatory view of a step-up cancellation process corresponding to FIG.
【００１５】先ず，図１及び図２において，負圧ブース
タＢのブースタシェル１は，対向端を相互に結合する前
後一対のシェル半体１ａ，１ｂとから構成される。その
前部シェル半体１ａの前壁には，複数の取り付けボルト
６を介してブレーキマスタシリンダＭのシリンダボディ
Ｍａが取り付けられ，後部シェル半体１ｂは，複数本の
支持ボルト７を介して自動車の車室前壁Ｆに固着され
る。First, in FIGS. 1 and 2, the booster shell 1 of the negative pressure booster B includes a pair of front and rear shell halves 1a and 1b whose opposing ends are mutually connected. The cylinder body Ma of the brake master cylinder M is mounted on the front wall of the front shell half 1a via a plurality of mounting bolts 6, and the rear shell half 1b is mounted on the vehicle via a plurality of support bolts 7. Is fixed to the front wall F of the passenger compartment.
【００１６】ブースタシェル１の内部は，それに前後往
復動可能に収容されるブースタピストン４と，その後面
に重ねて結着されると共に両シェル半体１ａ，１ｂ間に
挟止されるダイヤフラム５とにより，前側の負圧室２と
後側の作動室３とに区画される。負圧室２は，負圧導入
管１４を介して負圧源Ｖ（例えば内燃機関の吸気マニホ
ールド内部）と接続される。The inside of the booster shell 1 is provided with a booster piston 4 housed therein so as to be able to reciprocate back and forth, and a diaphragm 5 which is bonded to and overlapped on a rear surface thereof and is sandwiched between the two shell halves 1a and 1b. Thereby, it is divided into a negative pressure chamber 2 on the front side and a working chamber 3 on the rear side. The negative pressure chamber 2 is connected to a negative pressure source V (for example, inside an intake manifold of an internal combustion engine) via a negative pressure introducing pipe 14.
【００１７】ブースタピストン４は鋼板により環状に成
形されており，このブースタピストン４及びダイヤフラ
ム５の中心部に合成樹脂製の弁筒１０が一体的に結合さ
れる。この弁筒１０は，後部シェル半体１ｂの中心部に
後方へ突設された支持筒部１２にシールリップ付き軸受
部材１３を介して摺動自在に支承される。支持筒部１２
には，シールリップ付き軸受部材１３の前端面を押さえ
る環状の押さえ板８が嵌合されると，この押さえ板８を
固定する係止環９が係止される。The booster piston 4 is formed in an annular shape from a steel plate, and a synthetic resin valve cylinder 10 is integrally connected to the center of the booster piston 4 and the diaphragm 5. The valve cylinder 10 is slidably supported via a bearing member 13 with a seal lip on a support cylinder 12 projecting rearward from the center of the rear shell half 1b. Support tube 12
When the annular holding plate 8 for holding the front end face of the bearing member 13 with the seal lip is fitted, the locking ring 9 for fixing the holding plate 8 is locked.
【００１８】弁筒１０内には，弁ピストン１８，この弁
ピストン１８に連結する入力杆２０，及びこの入力杆２
０の前後動に応じて作動室３を負圧室２と大気とに連通
切換えする制御弁３８とが配設される。In the valve cylinder 10, a valve piston 18, an input rod 20 connected to the valve piston 18, and an input rod 2
A control valve 38 for switching the working chamber 3 to communicate with the negative pressure chamber 2 and the atmosphere in accordance with the zero back and forth movement is provided.
【００１９】弁ピストン１８は，弁筒１０に設けられた
ガイド孔１１に摺動自在に嵌合されるもので，その前端
には頸部１９を介して反力ピストン１７が，また後端に
はフランジ状の大気導入弁座３１がそれぞれ形成され
る。その大気導入弁座３１を囲繞するように同心配置さ
れる環状の負圧導入弁座３０が弁筒１０に形成される。The valve piston 18 is slidably fitted in a guide hole 11 provided in the valve cylinder 10. A reaction force piston 17 is provided at a front end thereof via a neck portion 19, and a rear end thereof is provided at a rear end thereof. Each has a flange-shaped air introduction valve seat 31 formed therein. An annular negative pressure introduction valve seat 30 concentrically arranged so as to surround the atmosphere introduction valve seat 31 is formed in the valve cylinder 10.
【００２０】弁ピストン１８には，大気導入弁座３１の
後端面に開口する連結孔１８ａが設けられ，この連結孔
１８ａに入力杆２０の球状前端部２０ａが嵌合されると
共に，その抜け止めのために弁ピストン１８の一部がか
しめられる。こうして入力杆２０は弁ピストン１８に首
振り可能に連結される。The valve piston 18 is provided with a connection hole 18a which is opened at the rear end face of the air introduction valve seat 31, and the spherical front end 20a of the input rod 20 is fitted into the connection hole 18a and the stopper is prevented from coming off. Therefore, a part of the valve piston 18 is caulked. Thus, the input rod 20 is swingably connected to the valve piston 18.
【００２１】また弁筒１０には，前記負圧導入弁座３０
及び大気導入弁座３１と協働する共通一個の弁体３４が
取り付けられる。この弁体３４は全体がゴム等の弾性材
で成形されたもので，環状の取り付けビード部３４ｂ
と，この取り付けビード部３４ｂから前方に延びる伸縮
筒部３４ｃと，この伸縮筒部３４ｃの前端から半径方向
外方に張り出したフランジ状の弁部３４ａとからなって
おり，その弁部３４ａには，その内周側から環状の補強
板４４が挿入され，モールド結合される。また弁部３４
ａの外周には，後方へ屈曲した環状のシールリップ３７
が一体に形成される。The valve cylinder 10 has the aforementioned negative pressure introducing valve seat 30.
A single common valve body 34 cooperating with the air introduction valve seat 31 is attached. The valve body 34 is entirely formed of an elastic material such as rubber, and has an annular mounting bead portion 34b.
And a telescopic tubular portion 34c extending forward from the mounting bead portion 34b, and a flange-shaped valve portion 34a projecting radially outward from the front end of the telescopic tubular portion 34c. An annular reinforcing plate 44 is inserted from its inner peripheral side and is joined by molding. Also, the valve portion 34
On the outer periphery of a, an annular seal lip 37 bent backward is provided.
Are integrally formed.
【００２２】取り付けビード部３４ｂは，負圧導入弁座
３０と共に弁筒１０の内周側に一体に形成された環状隆
起部１０ａの後端に当接する前後一対の弁ホルダ３５
Ａ，３５Ｂ間に挟持され，その際，後部の弁ホルダ３５
Ｂは，Ｏリング４３を介して弁筒１０の内周面に嵌合さ
れる。また弁部３４ａは大気導入弁座３１及び負圧導入
弁座３０に着座可能に対向して配置される。The mounting bead portion 34b is formed with a pair of front and rear valve holders 35 which abut on the rear end of an annular raised portion 10a integrally formed on the inner peripheral side of the valve cylinder 10 together with the negative pressure introducing valve seat 30.
A, 35B, with the rear valve holder 35
B is fitted to the inner peripheral surface of the valve cylinder 10 via the O-ring 43. The valve portion 34a is disposed so as to be seated on the atmosphere introduction valve seat 31 and the negative pressure introduction valve seat 30.
【００２３】弁部３４ａの補強板４４と入力杆２０との
間には，弁部３４ａを両弁座３０，３１との着座方向へ
付勢する弁ばね３６が縮設される。而して，上記負圧導
入弁座３０，大気導入弁座３１，弁体３４及び弁ばね３
６によって制御弁３８が構成される。Between the reinforcing plate 44 of the valve portion 34a and the input rod 20, a valve spring 36 for urging the valve portion 34a in the seating direction of the valve seats 30, 31 is contracted. Thus, the negative pressure introducing valve seat 30, the atmosphere introducing valve seat 31, the valve body 34 and the valve spring 3
6 constitutes a control valve 38.
【００２４】後部の弁ホルダ３５Ｂと入力杆２０との間
には入力戻しばね４１が縮設され，これによって前後の
弁ホルダ３５Ａ，３５Ｂが弁筒１０の環状***部１０ａ
後端に当接，保持されると共に，入力杆２０が後退方向
へ付勢される。An input return spring 41 is contracted between the rear valve holder 35B and the input rod 20, so that the front and rear valve holders 35A and 35B are connected to the annular raised portion 10a of the valve cylinder 10.
The input rod 20 is urged in the backward direction while being abutted and held at the rear end.
【００２５】弁筒１０内周の環状***部１０ａには，負
圧導入弁座３０を囲繞する前部環状室４５Ａが形成さ
れ，該室４５Ａに弁部３４ａの前面が臨む。前部環状室
４５Ａの半径方向外側の内周面は負圧導入弁座３０より
も後方へ延びており，その内周面に弁部３４ａ外周のシ
ールリップ３７が摺動可能に密接する。したがって，前
部環状室４５Ａは，弁部３４ａが負圧導入弁座３０に着
座したとき閉じられるようになっている。A front annular chamber 45A surrounding the negative pressure introducing valve seat 30 is formed in the annular raised portion 10a on the inner periphery of the valve cylinder 10, and the front surface of the valve portion 34a faces the chamber 45A. The radially outer inner peripheral surface of the front annular chamber 45A extends rearward from the negative pressure introducing valve seat 30, and the seal lip 37 on the outer periphery of the valve portion 34a slidably contacts the inner peripheral surface. Therefore, the front annular chamber 45A is closed when the valve portion 34a is seated on the negative pressure introducing valve seat 30.
【００２６】さらに環状***部１０ａに内側には，シー
ルリップ３７付き弁部３４ａによって，弁部３４ａの背
面が臨む後部環状室４５Ｂが画成される。A rear annular chamber 45B facing the back of the valve portion 34a is defined by the valve portion 34a with the seal lip 37 inside the annular ridge 10a.
【００２７】弁筒１０には第１及び第２ポート２８，２
９が設けられる。第１ポート２８は，横断面が弁筒１０
の外周面に沿った円弧状をなして一対設けられ，それら
の軸方向一端は負圧室２に，他端は前部環状室４５Ａに
それぞれ開口する。The valve cylinder 10 has first and second ports 28 and 2.
9 are provided. The first port 28 has a cross section of the valve cylinder 10.
Are provided in a pair in an arc shape along the outer peripheral surface, and one end in the axial direction opens to the negative pressure chamber 2 and the other end opens to the front annular chamber 45A.
【００２８】第２ポート２９は，前記ガイド孔１１の前
端の底部側で弁筒１０を直径線に沿い横切って作動室３
に開口する，弁筒１０の軸方向に偏平な横孔２９ａと，
ガイド孔１１の内周に形成されて上記横孔２９ａを負圧
導入弁座３０及び大気導入弁座３１間に連通する複数の
軸方向溝２９ｂとで構成される。この第２ポート２９
は，また，環状***部１０ａの根元に形成された，弁筒
１０の軸線と平行な連通孔４７を介して後部環状室４５
Ｂとも連通する。The second port 29 traverses the valve cylinder 10 along the diameter line on the bottom side of the front end of the guide hole 11 and the working chamber 3.
A lateral hole 29a which is flat in the axial direction of the valve cylinder 10 and
A plurality of axial grooves 29b formed in the inner periphery of the guide hole 11 and communicating the horizontal hole 29a between the negative pressure introduction valve seat 30 and the atmosphere introduction valve seat 31 are formed. This second port 29
The rear annular chamber 45 is formed through a communication hole 47 formed at the base of the annular ridge 10a and parallel to the axis of the valve cylinder 10.
Also communicates with B.
【００２９】前記後部シェル半体１ｂの支持筒部１２の
後端と入力杆２０とに，弁筒１０を被覆する伸縮可能の
ブーツ４０の両端が取り付けられ，このブーツ４０の後
端部に，前記弁体３４の内側に連通する大気導入口３９
が設けられる。この大気導入口３９に流入する空気を濾
過するフィルタ４２が入力杆２０の外周面と弁筒１０の
内周面との間に介裝される。このフィルタ４２は，入力
杆２０及び弁筒１０の相対移動を阻害しないよう，柔軟
性を有する。At the rear end of the support cylinder portion 12 of the rear shell half 1b and the input rod 20, both ends of an extendable boot 40 for covering the valve cylinder 10 are attached. Atmospheric inlet 39 communicating with the inside of the valve body 34
Is provided. A filter 42 for filtering air flowing into the air inlet 39 is interposed between the outer peripheral surface of the input rod 20 and the inner peripheral surface of the valve cylinder 10. The filter 42 has flexibility so as not to hinder the relative movement of the input rod 20 and the valve cylinder 10.
【００３０】さらにまた弁筒１０には，ブースタピスト
ン４及び弁ピストン１８の後退限を規定するキー部材５
０が一定距離の範囲で軸方向移動可能に取り付けられ
る。Further, a key member 5 for limiting the retreat limit of the booster piston 4 and the valve piston 18 is provided on the valve cylinder 10.
0 is attached so as to be movable in the axial direction within a certain distance.
【００３１】図２〜図４に示すように，キー部材５０は
厚肉の鋼板製で，一対の脚片５０ａ，５０ａの基端部を
連結部５０ｂを介して相互に一体に連結してなる二股状
のもので，その両脚片５０ａ，５０ａの互いに反対方向
を向く外側面には，頂面が平坦な位置決め凸部５１，５
１と，各位置決め凸部５１の両端に連なる凹部５２，５
２とが形成され，それら凹部５２，５２によって位置決
め凸部５１の両端面は円弧に形成される。また両脚片５
０ａ，５０ａの相対向する内側面には，その長手方向中
間部で，両脚片５０ａ，５０ａの間隔を急激に狭める円
弧状のカム面５３，５３が形成される。As shown in FIGS. 2 to 4, the key member 50 is made of a thick steel plate, and the base ends of a pair of leg pieces 50a, 50a are integrally connected to each other via a connecting portion 50b. Positioning projections 51, 5 having a flat top surface are formed on the outer surfaces of the leg pieces 50a, 50a facing in opposite directions.
1 and concave portions 52, 5 connected to both ends of each positioning convex portion 51.
2 are formed, and both end surfaces of the positioning projection 51 are formed in an arc by the recesses 52, 52. In addition, both legs 5
Arc-shaped cam surfaces 53, 53 for sharply narrowing the interval between the two leg pieces 50a, 50a are formed at the longitudinally intermediate portions of the opposing inner side surfaces of 0a, 50a.
【００３２】このキー部材５０は，弁筒１０の前記横孔
２９ａに嵌合しながら，両端部を弁筒１０の外周面から
所定長さ突出させる長さを有する。また両脚片５０ａ，
５０ａの位置決め凸部５１，５１の頂面間距離Ａは，前
記横孔２９ａの横幅Ｂより大きく設定されていて，位置
決め凸部５１，５１の両端面は前記軸方向溝２９ｂの内
周面に嵌合するようになっている。位置決め凸部５１，
５１の両端面が軸方向溝２９ｂの内周面に嵌合したと
き，両脚片５０ａ，５０ａは，弁ピストン１８及び反力
ピストン１７間の頸部１９を跨ぐと共に，カム面５３，
５３を頸部１９の外周面に当接させるようになってい
る。The key member 50 has a length such that both ends project from the outer peripheral surface of the valve cylinder 10 by a predetermined length while being fitted into the lateral hole 29a of the valve cylinder 10. Also, both leg pieces 50a,
The distance A between the top surfaces of the positioning protrusions 51, 50a is set to be larger than the width B of the horizontal hole 29a, and both end surfaces of the positioning protrusions 51, 51 are formed on the inner peripheral surface of the axial groove 29b. It fits. Positioning projection 51,
When the both end surfaces of 51 are fitted on the inner peripheral surface of the axial groove 29b, the two leg pieces 50a, 50a straddle the neck 19 between the valve piston 18 and the reaction force piston 17 and at the same time, the cam surface 53,
53 is brought into contact with the outer peripheral surface of the neck portion 19.
【００３３】而して，ブースタピストン４の後退時，弁
筒１０の外周面から突出したキー部材５０の両端部が前
記係止環９（本発明の第１ストッパに対応）の前面に当
接することにより，ブースタピストン４の後退限が規定
され，またキー部材５０が頸部１９の前端に連なるスト
ッパ面１９ａ（本発明の第２ストッパに対応）を受け止
めることにより，弁筒１０に対する弁ピストン１８の後
退限が規定される。When the booster piston 4 is retracted, both ends of the key member 50 protruding from the outer peripheral surface of the valve cylinder 10 come into contact with the front surface of the locking ring 9 (corresponding to the first stopper of the present invention). Accordingly, the retraction limit of the booster piston 4 is defined, and the key member 50 receives the stopper surface 19a (corresponding to the second stopper of the present invention) connected to the front end of the neck portion 19, whereby the valve piston 18 with respect to the valve cylinder 10 is received. The retraction limit is defined.
【００３４】弁筒１０の横孔２９ａの軸方向幅は，キー
部材５０の板厚より大きく設定されていて，弁筒１０と
キー部材５０とが僅かに相対移動ができるようになって
おり，また頸部１９の軸方向長さはキー部材５０の板厚
より大きく設定されていて，弁ピストン１８とキー部材
５０とが僅かに相対移動ができるようになっている。The axial width of the lateral hole 29a of the valve cylinder 10 is set to be greater than the thickness of the key member 50, so that the valve cylinder 10 and the key member 50 can slightly move relative to each other. The axial length of the neck portion 19 is set to be larger than the thickness of the key member 50 so that the valve piston 18 and the key member 50 can slightly move relative to each other.
【００３５】さらにまた弁筒１０には，前方に突出する
作動ピストン１５と，この作動ピストン１５の中心部を
貫通する小径シリンダ孔１６とが設けられ，この小径シ
リンダ孔１６に前記反力ピストン１７が摺動自在に嵌合
される。作動ピストン１５の外周にはカップ体２１が摺
動自在に嵌合され，このカップ体２１には作動ピストン
１５及び反力ピストン１７に対向する偏平な弾性ピスト
ン２２が充填される。その際，反力ピストン１７及び弾
性ピストン２２間には，負圧ブースタＢの非作動時に一
定の間隙ができるようになっている。Further, the valve cylinder 10 is provided with a working piston 15 protruding forward and a small-diameter cylinder hole 16 penetrating through the center of the working piston 15. Are slidably fitted. A cup body 21 is slidably fitted around the outer periphery of the working piston 15, and the cup body 21 is filled with a flat elastic piston 22 facing the working piston 15 and the reaction force piston 17. At this time, a certain gap is formed between the reaction force piston 17 and the elastic piston 22 when the negative pressure booster B is not operated.
【００３６】カップ体２１の前面には出力杆２５が突設
され，この出力杆２５は前記ブレーキマスタシリンダＭ
のピストンＭｂに連接される。An output rod 25 projects from the front surface of the cup body 21. The output rod 25 is connected to the brake master cylinder M.
Of the piston Mb.
【００３７】以上において，作動ピストン１５，反力ピ
ストン１７，弾性ピストン２２及びカップ体２１は，出
力杆２５の出力の一部を入力杆２０にフィードバックす
る反力機構２４を構成する。In the above, the working piston 15, the reaction force piston 17, the elastic piston 22 and the cup 21 constitute a reaction force mechanism 24 for feeding back a part of the output of the output rod 25 to the input rod 20.
【００３８】カップ体２１及び弁筒１０の前端面にリテ
ーナ２６が当接するように配設され，このリテーナ２６
とブースタシェル１の前壁との間にブースタピストン４
及び弁筒１０を後退方向へ付勢するブースタ戻しばね２
７が縮設される。A retainer 26 is disposed in contact with the cup body 21 and the front end surface of the valve cylinder 10.
Between the booster piston 4 and the front wall of the booster shell 1
And a booster return spring 2 for urging the valve cylinder 10 in the backward direction.
7 is contracted.
【００３９】次にこの実施例の作用について説明する。Next, the operation of this embodiment will be described.
【００４０】負圧ブースタＢの休止状態では，図２及び
図４に示すように，弁筒１０に取り付けられたキー部材
５０が後部シェル半体１ｂの係止環９の前面に当接する
ことによりブースタピストン４を後退限に保持し，また
このキー部材５０が頸部１９の前端に連なるストッパ面
１９ａを受け止めことにより弁ピストン１８を後退限に
保持する。このとき，大気導入弁座３１は弁体３４の弁
部３４ａに密着しながら，この弁部３４ａを押圧して負
圧導入弁座３０から僅かに離座させている。これによっ
て大気導入口３９及び第２ポート２９間の連通が遮断さ
れる一方，第１及び第２ポート２８，２９間が連通さ
れ，したがって負圧室２の負圧が両ポート２８，２９を
通して作動室３に伝達し，両室２，３は同圧となってい
るため，ブースタピストン４及び弁筒１０はブースタ戻
しばね２７の付勢力により後退位置に保持される。In the rest state of the negative pressure booster B, as shown in FIGS. 2 and 4, the key member 50 attached to the valve cylinder 10 comes into contact with the front surface of the locking ring 9 of the rear shell half 1b. The booster piston 4 is held at the retreat limit, and the key member 50 receives the stopper surface 19a connected to the front end of the neck portion 19, thereby holding the valve piston 18 at the retreat limit. At this time, while the air introduction valve seat 31 is in close contact with the valve portion 34a of the valve body 34, the valve portion 34a is pressed to slightly separate from the negative pressure introduction valve seat 30. As a result, the communication between the air inlet 39 and the second port 29 is cut off, while the communication between the first and second ports 28, 29 is established, so that the negative pressure in the negative pressure chamber 2 is operated through both ports 28, 29. Since the pressure is transmitted to the chamber 3 and both chambers 2 and 3 have the same pressure, the booster piston 4 and the valve cylinder 10 are held at the retracted position by the urging force of the booster return spring 27.
【００４１】いま，車両を制動すべくブレーキペダルＰ
を踏み込むことにより，入力戻しばね４１のセット荷重
に抗して入力杆２０を弁ピストン１８と共に前進させる
と，図５に示すように，弁ばね３６の付勢力が伸縮筒部
３４ｃを伸ばしながら弁部３４ａを負圧導入弁座３０に
着座させると同時に，大気導入弁座３１が弁体３４から
離れ，これにより第１及び第２ポート２８，２９間の連
通が遮断されると共に，第２ポート２９が弁体３４の内
側を通して大気導入口３９と連通される。Now, in order to brake the vehicle, the brake pedal P
When the input rod 20 is moved forward together with the valve piston 18 against the set load of the input return spring 41 by depressing the valve, the urging force of the valve spring 36 extends the telescopic cylinder portion 34c as shown in FIG. At the same time that the portion 34a is seated on the negative pressure introducing valve seat 30, the air introducing valve seat 31 is separated from the valve body 34, thereby interrupting the communication between the first and second ports 28, 29 and the second port. 29 communicates with the atmosphere inlet 39 through the inside of the valve body 34.
【００４２】その結果，大気導入口３９から弁筒１０内
に流入した大気が大気導入弁座３１を通過し，第２ポー
ト２９を経て作動室３に導入され，作動室３を負圧室２
より高圧にするので，それらの気圧差に基づく前方推力
を得てブースタピストン４は，弁筒１０，作動ピストン
１５，弾性ピストン２２，カップ体２１及び出力杆２５
を伴いながらブースタ戻しばね２７の力に抗して前進
し，出力杆２５によりブレーキマスタシリンダＭのピス
トンＭｂを駆動するようになる。この駆動に伴い生ずる
反力により弾性ピストン２２が圧縮されて，その一部を
小径シリンダ孔１６に膨出させるが，その膨出部が反力
ピストン１７の前面に当接するまでは，上記反力は入力
杆２０に伝わらないので，出力杆２５の出力は急速に立
ち上がるジャンピング特性を示す。As a result, the air flowing into the valve cylinder 10 from the air inlet 39 passes through the air inlet valve seat 31 and is introduced into the working chamber 3 through the second port 29, and the working chamber 3 is connected to the negative pressure chamber 2.
Since the pressure is made higher, the forward thrust based on the pressure difference is obtained, and the booster piston 4 moves the valve cylinder 10, the working piston 15, the elastic piston 22, the cup body 21 and the output rod 25.
With the force of the booster return spring 27, and the output rod 25 drives the piston Mb of the brake master cylinder M. The elastic piston 22 is compressed by the reaction force generated by this driving, and a part of the elastic piston 22 is swelled into the small-diameter cylinder hole 16. The reaction force is maintained until the bulged portion comes into contact with the front surface of the reaction force piston 17. Is not transmitted to the input rod 20, the output of the output rod 25 shows a jumping characteristic that rises rapidly.
【００４３】このような入力杆２０の前進操作時には，
弁筒１０の前部環状室４５Ａに臨む弁部３４ａの前面に
は，第１ポート２８から前部環状室４５Ａに伝達する負
圧が作用するのに対して，弁筒１０の後部環状室４５Ｂ
に臨む弁部３４ａの背面には，第２ポート２９から連通
孔４７を介して後部環状室４５Ｂに伝達する大気圧が作
用するので，弁部３４ａは，弁ばね３６のセット荷重に
よる他，前部及び後部環状室４５Ａ，４５Ｂ間の気圧差
によっても負圧導入弁座３０との着座方向へ付勢される
ことになる。したがって，上記気圧差による付勢力分，
弁ばね３６のセット荷重を低減することが可能となり，
それに伴い入力杆２０を後退方向へ付勢する入力戻しば
ね４１のセット荷重の低減も可能となり，その結果，比
較的小さい初期操作入力によりジャンピング特性が得ら
れるので，ブレーキマスタシリンダＭ及び各車輪ブレー
キの無効ストロークを素早く排除して，各車輪ブレーキ
の応答性を高めることができる。When the input lever 20 is moved forward,
While a negative pressure transmitted from the first port 28 to the front annular chamber 45A acts on the front surface of the valve portion 34a facing the front annular chamber 45A of the valve cylinder 10, the rear annular chamber 45B of the valve cylinder 10 operates.
At the back of the valve portion 34a facing the outside, the atmospheric pressure transmitted from the second port 29 to the rear annular chamber 45B through the communication hole 47 acts, so that the valve portion 34a The pressure is also urged in the seating direction with the negative pressure introduction valve seat 30 by the pressure difference between the part and the rear annular chamber 45A, 45B. Therefore, the urging force due to the above pressure difference,
The set load of the valve spring 36 can be reduced,
Accordingly, it is possible to reduce the set load of the input return spring 41 for urging the input rod 20 in the backward direction, and as a result, a jumping characteristic can be obtained by a relatively small initial operation input. Ineffective stroke can be quickly eliminated to increase the responsiveness of each wheel brake.
【００４４】またこの状態において，弁部３４ａ外周の
シールリップ３７は，後方に屈曲して，弁筒１０の内周
面に密接しているので，前部及び後部環状室４５Ａ，４
５Ｂ間の気圧差により，上記内周面への密接力が高めら
れ，両環状室４５Ａ，４５Ｂ間の気密を確保することが
できる。In this state, the seal lip 37 on the outer periphery of the valve portion 34a is bent rearward and is in close contact with the inner peripheral surface of the valve cylinder 10, so that the front and rear annular chambers 45A, 45A are provided.
Due to the pressure difference between 5B, the close contact force to the inner peripheral surface is increased, and airtightness between both annular chambers 45A, 45B can be secured.
【００４５】弾性ピストン２２が反力ピストン１７に当
接してからは，出力杆２５の作動反力の一部が弾性ピス
トン２２を介して入力杆２０にフィードバックされるこ
とになるので，操縦者は出力杆２５の出力の大きさを感
受することができる。そして出力杆２５の出力は，弾性
ピストン２２に当接する作動ピストン１５及び反力ピス
トン１７の受圧面積の比によって定まる倍力比をもって
増加する。After the elastic piston 22 comes into contact with the reaction force piston 17, a part of the operation reaction force of the output rod 25 is fed back to the input rod 20 via the elastic piston 22. The magnitude of the output of the output rod 25 can be sensed. The output of the output rod 25 increases with a boost ratio determined by the ratio of the pressure receiving areas of the working piston 15 and the reaction force piston 17 that abut on the elastic piston 22.
【００４６】負圧室２及び作動室３間の気圧差が最大と
なる倍力限界点に達してからは，出力杆２５の出力は，
ブースタピストン４の上記気圧差による最大推力と，入
力杆２０への操作入力との和となる。After reaching the boosting limit point at which the pressure difference between the negative pressure chamber 2 and the working chamber 3 becomes maximum, the output of the output rod 25 becomes
It is the sum of the maximum thrust by the pressure difference of the booster piston 4 and the operation input to the input rod 20.
【００４７】車両の制動状態を解除すべく，ブレーキペ
ダルＰから踏力を解放すると，先ず入力杆２０及び弁ピ
ストン１８が入力戻しばね４１の力をもって後退する。
これに伴い，弁ピストン１８は，図６に示すように，大
気導入弁座３１を弁体３４に着座させながら，その弁体
３４を負圧導入弁座３０から大きく離間させるので，作
動室３が第２ポート２９及び第１ポート２８を介して負
圧室２と連通する。その結果，作動室３への大気の導入
が阻止される一方，作動室３の空気が負圧室２を経て負
圧限Ｖに吸入され，それらの気圧差が無くなるため，ブ
ースタピストン４も，ブースタ戻しばね２７の弾発力を
もって後退し，マスタシリンダＭの作動を解除してい
く。そして，ブースタピストン４及び入力杆２０は，再
び図１及び図２の休止状態に戻る。When the pedaling force is released from the brake pedal P in order to release the braking state of the vehicle, first, the input rod 20 and the valve piston 18 are retracted by the force of the input return spring 41.
Accordingly, the valve piston 18 causes the valve body 34 to be largely separated from the negative pressure introduction valve seat 30 while seating the air introduction valve seat 31 on the valve body 34 as shown in FIG. Communicates with the negative pressure chamber 2 via the second port 29 and the first port 28. As a result, the introduction of air into the working chamber 3 is prevented, while the air in the working chamber 3 is sucked into the negative pressure limit V through the negative pressure chamber 2 and the pressure difference between them is eliminated. With the resilience of the booster return spring 27, it retreats and releases the operation of the master cylinder M. Then, the booster piston 4 and the input rod 20 return to the rest state of FIGS. 1 and 2 again.
【００４８】ところで，前記キー部材５０の取り付けに
当たっては，キー部材５０を，その両脚片５０ａ，５０
ａの先端側から弁筒１０の横孔２９ａに挿入する。その
際，両脚片５０ａ，５０ａの位置決め凸部５１，５１が
横孔２９ａの一端部を通過するまでは，両脚片５０ａ，
５０ａが互いに近接するように撓まされ，位置決め凸部
５１，５１が軸方向溝２９ｂとの対応位置に達すると，
両脚片５０ａ，５０ａの復元力をもって位置決め凸部５
１，５１は軸方向溝２９ｂの内周面に嵌合し，この嵌合
力によってキー部材５０が定位置に保持され，横孔２９
ａからの抜け出しがガタ無く阻止され，キー部材５０が
振動騒音を発することもない。In mounting the key member 50, the key member 50 is attached to both leg pieces 50a, 50a.
a is inserted into the lateral hole 29a of the valve cylinder 10 from the front end side. At this time, the two leg pieces 50a, 50a, 50a, until the positioning projections 51, 51 pass through one end of the horizontal hole 29a, the two leg pieces 50a,
When the positioning protrusions 51, 51 reach the positions corresponding to the axial grooves 29b,
The positioning projection 5 has a restoring force of the two leg pieces 50a, 50a.
1 and 51 are fitted in the inner peripheral surface of the axial groove 29b, and the key member 50 is held at a fixed position by this fitting force.
The escape from a is prevented without play, and the key member 50 does not emit vibration noise.
【００４９】しかも，位置決め凸部５１，５１が軸方向
溝２９ｂの内周面に嵌合したときは，両脚片５０ａ，５
０ａが弁ピストン１８の頸部１９を跨いで，カム面５
３，５３を頸部１９の外周面に当接させるので，もし，
キー部材５０が前記嵌合位置，即ち弁筒１０に対する定
位置を越えて横孔２９ａに押し込まれようとすると，カ
ム面５３，５３が頸部１９の外周面により押し広げら
れ，それに伴い両脚片５０ａ，５０ａが位置決め凸部５
１を軸方向溝２９ｂの内周面に強く押圧することにな
り，その結果，キー部材５０の前記定位置からの行き過
ぎを確実に防ぐことができ，組立性が良好となる。Further, when the positioning projections 51, 51 are fitted on the inner peripheral surface of the axial groove 29b, the two leg pieces 50a, 5
0a straddles the neck 19 of the valve piston 18 and the cam surface 5
3 and 53 are brought into contact with the outer peripheral surface of the neck 19,
When the key member 50 is pushed into the lateral hole 29a beyond the fitting position, that is, beyond the fixed position with respect to the valve cylinder 10, the cam surfaces 53, 53 are pushed apart by the outer peripheral surface of the neck portion 19, and accordingly, the two leg pieces 50a, 50a are positioning convex portions 5
1 is strongly pressed against the inner peripheral surface of the axial groove 29b. As a result, the key member 50 can be reliably prevented from going too far from the fixed position, and the assembling property is improved.
【００５０】また位置決め凸部５１，５１が嵌合する軸
方向溝２９ｂは，第２ポート２９の一部を構成するもの
であるから，キー部材５０の弁筒１０への取り付けに第
２ポート２９を有効に利用することができ，弁筒１０の
構造を特別複雑化しないで済み，そのインジェクション
成形を容易に行うことができる。Since the axial groove 29b into which the positioning projections 51 and 51 are fitted forms a part of the second port 29, the second port 29 is used to attach the key member 50 to the valve cylinder 10. Can be effectively used, the structure of the valve cylinder 10 does not need to be particularly complicated, and the injection molding thereof can be easily performed.
【００５１】本発明は，上記実施例に限定されるもので
はなく，その要旨を逸脱しない範囲で種々の設計変更が
可能である。例えば，負圧ブースタＢは，前後一対のブ
ースタピストンを同一の弁筒に結合したタンデム型に構
成することもできる。The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, the negative pressure booster B may be configured as a tandem type in which a pair of front and rear booster pistons are connected to the same valve cylinder.
【００５２】[0052]
【発明の効果】以上のように本発明の第１の特徴によれ
ば，ブースタシェルに，その内部を負圧源に連なる前側
の負圧室と後側の作動室とに区画するブースタピストン
を収容し，このブースタピストンに連設される弁筒に，
この弁筒に前後方向摺動自在に嵌合する弁ピストンと，
この弁ピストンに前端部を連結する入力杆と，弁ピスト
ン及び弁筒間で入力杆の前後動に応じて作動室を負圧室
と大気とに連通切換えする制御弁と，弁筒に，それを直
径方向に貫通すると共に弁ピストンの頸部を跨いで取り
付けられ，ブースタシェルに形成された第１ストッパに
当接して弁筒の後退限を規定し，また前記頸部の前端に
連なる第２ストッパを受け止めて弁筒に対する弁ピスト
ンの後退限を規定する，一対の脚片からなる二股状のキ
ー部材とを備える負圧ブースタにおいて，前記一対の脚
片の互いに反対方向を向く外側面に，弁筒の内周面に対
向する位置決め凸部を形成したので，キー部材の両脚片
の位置決め凸部と弁筒の内周面との当接により，キー部
材を弁筒の定位置に保持することができ，したがって弁
筒の構造を特別複雑化しないで済み，その成形を容易に
行うことができる。As described above, according to the first feature of the present invention, the booster shell is provided with the booster piston for partitioning the inside thereof into a front negative pressure chamber connected to a negative pressure source and a rear working chamber. The booster piston accommodates
A valve piston which is slidably fitted in the valve cylinder in the front-rear direction,
An input rod for connecting the front end to the valve piston, a control valve for switching the working chamber between a negative pressure chamber and the atmosphere between the valve piston and the valve cylinder in accordance with the forward and backward movement of the input rod, and a valve cylinder. And diametrically penetrates and is attached across the neck of the valve piston, abuts a first stopper formed on the booster shell to define a retreat limit of the valve cylinder, and a second end connected to the front end of the neck. A bifurcated key member comprising a pair of leg pieces for receiving the stopper and defining a retreat limit of the valve piston with respect to the valve cylinder; and a bifurcated key member comprising a pair of leg pieces. Since the positioning convex portion facing the inner peripheral surface of the valve cylinder is formed, the key member is held at a fixed position of the valve cylinder by abutting the positioning convex portions of both leg pieces of the key member and the inner peripheral surface of the valve cylinder. Therefore, the structure of the valve cylinder can be specially duplicated. Requires not, it is possible to perform the molding easily.
【００５３】また本発明の第２の特徴によれば，前記位
置決め凸部を弁筒の内周面に嵌合したので，キー部材を
弁筒の定位置にガタを無く保持することができて，振動
騒音の発生を防ぐことができる。According to the second aspect of the present invention, since the positioning projection is fitted to the inner peripheral surface of the valve cylinder, the key member can be held at a fixed position of the valve cylinder without play. , Generation of vibration noise can be prevented.
【００５４】さらに本発明の第３の特徴によれば，第２
の特徴に加えて，前記位置決め凸部の弁筒内周面との嵌
合位置を超えてキー部材が弁筒に押入されると，前記頸
部の外周面に当接して両脚片間を開くカム面を両脚片の
相対向する内側面に形成したので，もし，キー部材が上
記嵌合位置を越えて弁筒に押し込まれようとすると，カ
ム面が頸部の外周面により押し広げられ，それに伴い両
脚片が位置決め凸部を軸方向溝の内周面に強く押圧する
ことになり，その結果，キー部材の前記定位置からの行
き過ぎを確実に防ぐことができる。Further, according to a third aspect of the present invention, the second
In addition to the above features, when the key member is pushed into the valve cylinder beyond the fitting position of the positioning convex portion with the inner peripheral surface of the valve cylinder, the key member comes into contact with the outer peripheral surface of the neck portion to open between the two leg pieces. Since the cam surface is formed on the opposing inner surfaces of the two leg pieces, if the key member is pushed into the valve cylinder beyond the above-mentioned fitting position, the cam surface is spread by the outer peripheral surface of the neck, As a result, the two leg pieces strongly press the positioning convex portion against the inner peripheral surface of the axial groove, and as a result, the key member can be reliably prevented from going too far from the fixed position.
【図１】本発明に係るシングル型負圧ブースタを入力杆
の休止状態で示す縦断面図。FIG. 1 is a longitudinal sectional view showing a single type negative pressure booster according to the present invention in a state where an input rod is at rest.
【図２】図１の２部拡大図。FIG. 2 is an enlarged view of a part of FIG.
【図３】図２の３−３線断面図。FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;
【図４】図３の４−４線断面図。FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;
【図５】図３の５−５線断面で示す，倍力作用説明図。FIG. 5 is an explanatory view of a boosting action, taken along the line 5-5 in FIG. 3;
【図６】図５に対応した倍力解除過程説明図。FIG. 6 is an explanatory view of a boost cancellation process corresponding to FIG. 5;
Ｂ・・・・負圧ブースタ Ｖ・・・・負圧源 １・・・・ブースタシェル ２・・・・負圧室 ３・・・・作動室 ４・・・・ブースタピストン ９・・・・第１ストッパ（係止環） １０・・・弁筒 １８・・・弁ピストン １９・・・頸部 １９ａ・・第２ストッパ（ストッパ面） ２０・・・入力杆 ３８・・・制御弁 ５０・・・キー部材 ５０ａ・・脚片 ５１・・・凸部 ５３・・・カム面 B ... Negative pressure booster V ... Negative pressure source 1 ... Booster shell 2 ... Negative pressure chamber 3 ... Working chamber 4 ... Booster piston 9 ... 1st stopper (locking ring) 10 ... valve cylinder 18 ... valve piston 19 ... neck 19a ... second stopper (stopper surface) 20 ... input rod 38 ... control valve 50 ... ..Key member 50a. Leg piece 51... Convex part 53... Cam surface
Claims (3)
圧源（Ｖ）に連なる前側の負圧室（２）と後側の作動室
（３）とに区画するブースタピストン（４）を収容し，
このブースタピストン（４）に連設される弁筒（１０）
に，この弁筒（１０）に前後方向摺動自在に嵌合する弁
ピストン（１８）と，この弁ピストン（１８）に前端部
を連結する入力杆（２０）と，弁ピストン（１８）及び
弁筒（１０）間で入力杆（２０）の前後動に応じて作動
室（３）を負圧室（２）と大気とに連通切換えする制御
弁（３８）と，弁筒（１０）に，それを直径方向に貫通
すると共に弁ピストン（１８）の頸部（１９）を跨いで
取り付けられ，ブースタシェル（１）に形成された第１
ストッパ（９）に当接して弁筒（１０）の後退限を規定
し，また前記頸部（１９）の前端に連なる第２ストッパ
（１９ａ）を受け止めて弁筒（１０）に対する弁ピスト
ン（１８）の後退限を規定する，一対の脚片（５０ａ，
５０ａ）からなる二股状のキー部材（５０）とを備える
負圧ブースタにおいて，前記一対の脚片（５０ａ，５０
ａ）の互いに反対方向を向く外側面に，弁筒（１０）の
内周面に対向する位置決め凸部（５１）を形成したこと
を特徴する，負圧ブースタ。1. A booster shell (1) having a booster piston (4) for partitioning a booster shell (1) into a front negative pressure chamber (2) connected to a negative pressure source (V) and a rear working chamber (3). Contain
A valve cylinder (10) connected to the booster piston (4)
A valve piston (18) fitted to the valve cylinder (10) so as to be slidable in the front-rear direction, an input rod (20) for connecting the front end to the valve piston (18), a valve piston (18) and A control valve (38) for switching the working chamber (3) between the negative pressure chamber (2) and the atmosphere in accordance with the forward and backward movement of the input rod (20) between the valve cylinders (10) and the valve cylinder (10); , Which is diametrically penetrated and mounted across the neck (19) of the valve piston (18) and formed on the booster shell (1).
The valve piston (10) is brought into contact with the stopper (9) to define a retreat limit, and receives the second stopper (19a) connected to the front end of the neck (19) to receive the valve piston (18) with respect to the valve cylinder (10). ), A pair of leg pieces (50a,
And a bifurcated key member (50) made of a pair of leg pieces (50a, 50a).
A negative pressure booster characterized in that a positioning projection (51) facing an inner peripheral surface of a valve cylinder (10) is formed on an outer surface facing in the opposite direction of a).
前記位置決め凸部（５１）を弁筒（１０）の内周面に嵌
合したことを特徴する，負圧ブースタ。2. The negative pressure booster according to claim 1,
A negative pressure booster characterized in that the positioning projection (51) is fitted to the inner peripheral surface of the valve cylinder (10).
前記位置決め凸部（５１）の弁筒（１０）内周面との嵌
合位置を超えてキー部材（５０）が弁筒（１０）に押入
されると，前記頸部（１９）の外周面に当接して両脚片
（５０ａ，５０ａ）間を開くカム面（５３）を両脚片
（５０ａ，５０ａ）の相対向する内側面に形成したこと
を特徴する，負圧ブースタ。3. The negative pressure booster according to claim 2,
When the key member (50) is pushed into the valve cylinder (10) beyond the fitting position of the positioning convex part (51) with the inner peripheral surface of the valve cylinder (10), the outer peripheral surface of the neck part (19). A negative pressure booster characterized in that a cam surface (53) which opens between the two leg pieces (50a, 50a) in contact with the inner surface of the both leg pieces (50a, 50a) is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001059527A JP4590119B2 (en) | 2001-03-05 | 2001-03-05 | Negative pressure booster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001059527A JP4590119B2 (en) | 2001-03-05 | 2001-03-05 | Negative pressure booster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002255022A true JP2002255022A (en) | 2002-09-11 |
| JP4590119B2 JP4590119B2 (en) | 2010-12-01 |
Family
ID=18919077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001059527A Expired - Fee Related JP4590119B2 (en) | 2001-03-05 | 2001-03-05 | Negative pressure booster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4590119B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007161214A (en) * | 2005-12-16 | 2007-06-28 | Nissin Kogyo Co Ltd | Negative pressure booster |
| JP2014076784A (en) * | 2012-10-12 | 2014-05-01 | Nissin Kogyo Co Ltd | Negative pressure booster |
| WO2016104619A1 (en) * | 2014-12-25 | 2016-06-30 | 株式会社アドヴィックス | Negative-pressure-type booster |
| CN114518189A (en) * | 2021-12-30 | 2022-05-20 | 山东省计量科学研究院 | Ultrahigh pressure piston type pressure gauge with measuring range of 1400MPa |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007161214A (en) * | 2005-12-16 | 2007-06-28 | Nissin Kogyo Co Ltd | Negative pressure booster |
| JP4512032B2 (en) * | 2005-12-16 | 2010-07-28 | 日信工業株式会社 | Negative pressure booster |
| JP2014076784A (en) * | 2012-10-12 | 2014-05-01 | Nissin Kogyo Co Ltd | Negative pressure booster |
| US9260098B2 (en) | 2012-10-12 | 2016-02-16 | Nissin Kogyo Co., Ltd. | Vacuum booster |
| WO2016104619A1 (en) * | 2014-12-25 | 2016-06-30 | 株式会社アドヴィックス | Negative-pressure-type booster |
| CN114518189A (en) * | 2021-12-30 | 2022-05-20 | 山东省计量科学研究院 | Ultrahigh pressure piston type pressure gauge with measuring range of 1400MPa |
| CN114518189B (en) * | 2021-12-30 | 2024-06-11 | 山东省计量科学研究院 | Ultrahigh pressure piston type pressure gauge with measuring range of 1400MPa |
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|---|---|
| JP4590119B2 (en) | 2010-12-01 |
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