JP2001213303A - Negative pressure booster - Google Patents
Negative pressure boosterInfo
- Publication number
- JP2001213303A JP2001213303A JP2000024795A JP2000024795A JP2001213303A JP 2001213303 A JP2001213303 A JP 2001213303A JP 2000024795 A JP2000024795 A JP 2000024795A JP 2000024795 A JP2000024795 A JP 2000024795A JP 2001213303 A JP2001213303 A JP 2001213303A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- negative pressure
- piston
- valve seat
- 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.)
- Pending
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，該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，該弁ピストン及び該弁筒間で前記入力杆の前後動に
応じて前記作動室を前記負圧室と大気とに連通切換えす
る制御弁と，前記入力杆を後退方向へ付勢する入力戻し
ばねとを配設し，この制御弁を，前記弁筒に形成された
環状の負圧導入弁座と，前記弁ピストンに形成されて前
記負圧導入弁座の内側に配置される大気導入弁座と，前
記弁筒に前記負圧導入弁座及び大気導入弁座に着座可能
に対向する環状の弁部，前記弁筒の内周面に固定的に保
持される環状の取付けビード部，前記取付けビード部か
ら半径方向内方へ延びる環状の第１可撓膜部，及びこの
第１可撓膜部の内周端から軸方向へ延びて前記弁部に結
合する環状の第２可撓膜部からなる弁体と，前記弁部を
前記負圧導入弁座及び大気導入弁座との着座方向へ付勢
する弁ばねとで構成し，前記負圧導入弁座及び弁体間の
弁筒内周面に前記負圧室に連通する第１ポートを開口
し，また前記負圧導入弁座及び大気導入弁座間の弁筒内
周面に前記作動室に連通する第２ポートを開口し，前記
弁部の内周側を大気に連通した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 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. A control valve for switching 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 valve piston and the valve cylinder; And an input return spring for biasing the control valve. The control valve is provided between an annular negative pressure introducing valve seat formed on the valve cylinder and the negative pressure introducing valve seat formed on the valve piston. The air introduction valve seat to be arranged and the negative pressure An annular valve portion that is seatably opposed to the inlet valve seat and the air introduction valve seat, an annular mounting bead portion fixedly held on the inner peripheral surface of the valve cylinder, and extends radially inward from the mounting bead portion; A valve body comprising an annular first flexible film portion, an annular second flexible film portion axially extending from an inner peripheral end of the first flexible film portion and coupled to the valve portion; And a valve spring for biasing the negative pressure introducing valve seat and the air introducing valve seat in the seating direction, and communicating with the negative pressure chamber on the inner peripheral surface of the valve cylinder between the negative pressure introducing valve seat and the valve body. A second port communicating with the working chamber is opened on the inner peripheral surface of the valve cylinder between the negative pressure introducing valve seat and the atmosphere introducing valve seat, and the inner peripheral side of the valve portion is exposed to the atmosphere. It relates to improvement of a connected negative pressure booster.
【０００２】[0002]
【従来の技術】かゝる負圧ブースタは，例えば実公昭５
８−４８９２３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-8-48923.
【０００３】上記公報に開示された負圧ブースタの制御
弁周りを図６に示す。同図より明らかなように，従来の
負圧ブースタの制御弁３８は，弁筒１０に形成された環
状の負圧導入弁座３０と，入力杆２０に連結した弁ピス
トン１８に形成されて負圧導入弁座３０の内側に配置さ
れる大気導入弁座３１と，弁筒１０に負圧導入弁座３０
及び大気導入弁座３１に着座可能に対向する環状の弁部
３４ａ，弁筒１０の内周面に固定的に保持される環状の
取付けビード部３４ｂ，この取付けビード部３４ｂから
半径方向内方へ延びる環状の第１可撓膜部３４ｃ，及び
この第１可撓膜部３４ｃの内周端から軸方向へ延びて弁
部３４ａに結合する環状の第２可撓膜部３４ｄからなる
弁体３４と，その弁部３４ａを前記負圧導入弁座３０及
び大気導入弁座３１との着座方向へ付勢する弁ばね３６
とで構成される。そして，負圧導入弁座３０及び弁体３
４間の弁筒１０内周面に負圧室２に連通する第１ポート
２８が開口し，また前記負圧導入弁座３０及び大気導入
弁座３１間の弁筒１０内周面に作動室３に連通する第２
ポート２９が開口し，弁部３４ａの内周側に連なる大気
導入口３９が弁筒１０の後端に設けられる。また弁筒１
０と入力杆２０との間には，入力杆２０を後退方向へ付
勢する入力戻しばね４１が縮設される。符号４は，弁筒
１０が一体的に結合されるブースタピストンである。FIG. 6 shows the vicinity of a control valve of a negative pressure booster disclosed in the above publication. As is apparent from FIG. 1, the control valve 38 of the conventional negative pressure booster is formed by an annular negative pressure introduction valve seat 30 formed on the valve cylinder 10 and a valve piston 18 formed on the valve piston 18 connected to the input rod 20. An air introduction valve seat 31 disposed inside the pressure introduction valve seat 30 and a negative pressure introduction valve seat 30
And an annular valve portion 34a opposed to the air introduction valve seat 31 so as to be seated, an annular mounting bead portion 34b fixedly held on the inner peripheral surface of the valve cylinder 10, and a radially inward direction from the mounting bead portion 34b. A valve body 34 that includes an annular first flexible film portion 34c that extends and an annular second flexible film portion 34d that extends axially from the inner peripheral end of the first flexible film portion 34c and is coupled to the valve portion 34a. And a valve spring 36 for urging the valve portion 34a in the seating direction of the negative pressure introducing valve seat 30 and the atmosphere introducing valve seat 31.
It is composed of Then, the negative pressure introduction valve seat 30 and the valve body 3
A first port 28 communicating with the negative pressure chamber 2 is opened on the inner peripheral surface of the valve cylinder 10 between the valve cylinders 4. 2nd communicating with 3
The port 29 is opened, and an air introduction port 39 connected to the inner peripheral side of the valve portion 34a is provided at the rear end of the valve cylinder 10. Valve cylinder 1
An input return spring 41 for urging the input rod 20 in the backward direction is contracted between 0 and the input rod 20. Reference numeral 4 denotes a booster piston to which the valve cylinder 10 is integrally connected.
【０００４】[0004]
【発明が解決しようとする課題】一般に，かゝる負圧ブ
ースタにおいて，入力杆の初期操作入力は，入力戻しば
ねのセット荷重によって決定されるので，この入力戻し
ばねのセット荷重を極力小さく設定することが操作力の
軽減のために望まれる。Generally, in such a negative pressure booster, since the initial operation input of the input rod is determined by the set load of the input return spring, the set load of the input return spring is set as small as possible. It is desirable to reduce operating force.
【０００５】ところで，入力戻しばね４１のセット荷重
は，入力杆２０から操作入力を解除して，大気導入弁座
３１を弁体３４の弁部３４ａに着座させる共に，該弁部
３４ａを負圧導入弁座３０から離座させているとき，弁
ピストン１８及び弁体３４の内外に作用する負圧室２の
負圧と大気圧との気圧差による弁ピストン１８及び弁体
３４の前方への引き込み力に抗して入力杆２０を後退限
に保持するに足る大きさが必要がある。When the input load of the input return spring 41 is released, the operation input from the input rod 20 is released, the air introduction valve seat 31 is seated on the valve portion 34a of the valve body 34, and the valve portion 34a is placed under negative pressure. When it is separated from the introduction valve seat 30, the valve piston 18 and the valve body 34 move forward due to the pressure difference between the negative pressure of the negative pressure chamber 2 acting inside and outside of the valve body 34 and the atmospheric pressure. It is necessary that the input rod 20 be large enough to hold the input rod 20 at the backward limit against the retraction force.
【０００６】しかしながら，従来の負圧ブースタでは，
弁体３４の第１可撓膜部３４ｃの前面にまで負圧室２の
負圧が作用するようになっているため，前記気圧差によ
る弁ピストン１８及び弁体３４の前方への引き込み力
は，前記気圧差に第１可撓膜部３４ｃの有効直径Ｄを乗
じた比較的大きな値を持つことになり，入力戻しばね４
１のセット荷重を下げるにも限界がある。However, in the conventional negative pressure booster,
Since the negative pressure of the negative pressure chamber 2 acts on the front surface of the first flexible film portion 34c of the valve body 34, the force of drawing the valve piston 18 and the valve body 34 forward due to the pressure difference is small. Has a relatively large value obtained by multiplying the pressure difference by the effective diameter D of the first flexible membrane portion 34c.
There is a limit in reducing the set load of No. 1.
【０００７】本発明は，かゝる事情に鑑みてなされたも
ので，前記気圧差による弁ピストン及び弁体の前方への
引き込み力を減少させて，入力戻しばねのセット荷重を
下げ，入力杆の初期操作入力を軽減させ得るようにし
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-mentioned circumstances, and reduces a set force of an input return spring by reducing a retraction force of a valve piston and a valve body caused by the pressure difference. It is an object of the present invention to provide a negative pressure booster capable of reducing initial operation input of the above.
【０００８】[0008]
【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，該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，
該弁ピストン及び該弁筒間で前記入力杆の前後動に応じ
て前記作動室を前記負圧室と大気とに連通切換えする制
御弁と，前記入力杆を後退方向へ付勢する入力戻しばね
とを配設し，この制御弁を，前記弁筒に形成された環状
の負圧導入弁座と，前記弁ピストンに形成されて前記負
圧導入弁座の内側に配置される大気導入弁座と，前記弁
筒に前記負圧導入弁座及び大気導入弁座に着座可能に対
向する環状の弁部，前記弁筒の内周面に固定的に保持さ
れる環状の取付けビード部，前記取付けビード部から半
径方向内方へ延びる環状の第１可撓膜部，及びこの第１
可撓膜部の内周端から軸方向へ延びて前記弁部に結合す
る環状の第２可撓膜部からなる弁体と，前記弁部を前記
負圧導入弁座及び大気導入弁座との着座方向へ付勢する
弁ばねとで構成し，前記負圧導入弁座及び弁体間の弁筒
内周面に前記負圧室に連通する第１ポートを開口し，ま
た前記負圧導入弁座及び大気導入弁座間の弁筒内周面に
前記作動室に連通する第２ポートを開口し，前記弁部の
内周側を大気に連通した負圧ブースタにおいて，前記第
２可撓膜部を囲繞して第１可撓膜部の前面に当接する支
承板を前記弁筒に固定したことを特徴する。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. A valve piston connected to the booster piston, the valve piston being slidably fitted in the valve cylinder in the front-rear direction, and an input rod connecting a front end to the valve piston.
A control valve for switching 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 valve piston and the valve cylinder; and an input return spring for urging the input rod in a backward direction. The control valve is provided with an annular negative pressure introduction valve seat formed in the valve cylinder, and an air introduction valve seat formed in the valve piston and arranged inside the negative pressure introduction valve seat. An annular valve portion which faces the valve cylinder so as to be seated on the negative pressure introduction valve seat and the air introduction valve seat, an annular mounting bead portion fixedly held on an inner peripheral surface of the valve cylinder, An annular first flexible membrane portion extending radially inward from the bead portion;
A valve body comprising an annular second flexible film portion extending in the axial direction from the inner peripheral end of the flexible film portion and coupled to the valve portion; and the valve portion having the negative pressure introduction valve seat and the atmosphere introduction valve seat. A first port communicating with the negative pressure chamber is opened on the inner peripheral surface of the valve cylinder between the negative pressure introducing valve seat and the valve body, and the negative pressure introducing valve is provided. In a negative pressure booster in which a second port communicating with the working chamber is opened on an inner peripheral surface of a valve cylinder between a valve seat and an atmosphere introduction valve seat, and the inner peripheral side of the valve portion communicates with the atmosphere, the second flexible membrane is provided. A support plate surrounding the portion and abutting on the front surface of the first flexible membrane portion is fixed to the valve cylinder.
【０００９】この特徴によれば，第１可撓膜部に前記気
圧差による引き込み力が加わっても，この第１可撓膜部
に対する引き込み力は，弁筒に固定された支承板に受け
止められるので，その分，弁ピストン及び弁体から入力
杆に作用する前記気圧差による引き込み力が減少する。
したがって入力戻しばねのセット荷重を下げることが可
能となり，入力杆への初期操作入力の低減を図ることが
できる。According to this feature, even if the pull-in force due to the pressure difference is applied to the first flexible membrane portion, the pull-in force to the first flexible membrane portion is received by the support plate fixed to the valve cylinder. Therefore, the pulling force due to the pressure difference acting on the input rod from the valve piston and the valve body decreases accordingly.
Therefore, the set load of the input return spring can be reduced, and the initial operation input to the input rod can be reduced.
【００１０】[0010]
【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.
【００１１】図１は本発明の一実施例に係るシングル型
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は倍力作動状態を示す，図２
に対応した作用説明図，図４は倍力解除過程を示す，図
２に対応した作用説明図，図５は上記負圧ブースタの倍
力特性線図である。FIG. 1 is a longitudinal sectional view showing a single type negative pressure booster according to an embodiment of the present invention in a state where an input rod is at rest, and FIG.
2 is an enlarged view of part 2 of FIG. 1, and FIG. 3 shows a boost operation state.
FIG. 4 is an operation explanatory diagram corresponding to FIG. 2, and FIG. 5 is a boost characteristic diagram of the negative pressure booster.
【００１２】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，その後
部シェル半体１ｂが自動車の車室前壁Ｆにボルト８によ
り固定して支持され，前部シェル半体１ａには，該ブー
スタＢにより作動されるブレーキマスタシリンダＭのシ
リンダボディＭａがボルト９により固着される。First, in FIGS. 1 and 2, the booster shell 1 of the negative pressure booster B is composed of a pair of front and rear shell halves 1a and 1b whose opposite ends are connected to each other. A cylinder body Ma of a brake master cylinder M, which is operated by the booster B, is fixed to the front shell half 1a by bolts 9 and is fixedly supported on the front wall F of the vehicle cabin by the bolts 8.
【００１３】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。そして負圧室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 interior of the booster shell 1 includes a booster piston 4 accommodated therein so as to be able to reciprocate back and forth, and a diaphragm 5 which is bonded to and overlapped with 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.
【００１４】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。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 center of 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.
【００１５】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。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.
【００１６】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１８ａを介して反力ピストン１７が，また後端
には環状の大気導入弁座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, and has a reaction force piston 17 at a front end via a neck 18a and a rear end at a rear end. Are formed with respective annular air introduction valve seats 31. An annular negative pressure introduction valve seat 30 is formed in the valve cylinder 10 so as to surround the atmosphere introduction valve seat 31.
【００１７】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，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 surface 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. For this purpose, a part of the valve piston 18 is swaged, so that the input rod 20 is swingably connected to the valve piston 18.
【００１８】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に対向する共通一個の弁体３４が
配設される。この弁体３４は，負圧導入弁座３０及び大
気導入弁座３１に着座可能に対向する環状の弁部３４ａ
と，弁筒１０の内周面に固定される環状の取付けビード
部３４ｂと，この取付けビード部３４ｂから半径方向内
方へ延びる環状の第１可撓膜部３４ｃと，この第１可撓
膜部３４ｃの内周端から軸方向前方に延びて弁部３４ａ
に結合する環状の第２可撓膜部３４ｄとから構成され，
その弁部３４ａを両弁座３０，３１との着座方向へ付勢
する弁ばね３６が弁部３４ａと入力杆２０との間に縮設
される。 上記負圧導入弁座
３０，大気導入弁座３１，弁体３４及び弁ばね３６によ
って制御弁３８が構成される。The negative pressure introducing valve seat 30 is provided in the valve cylinder 10.
One common valve body 34 facing the air introduction valve seat 31 is provided. The valve body 34 has an annular valve portion 34a which is opposed to the negative pressure introduction valve seat 30 and the atmosphere introduction valve seat 31 so as to be seated.
An annular mounting bead portion 34b fixed to the inner peripheral surface of the valve cylinder 10, an annular first flexible film portion 34c extending radially inward from the mounting bead portion 34b, and the first flexible film portion The valve portion 34a extends axially forward from the inner peripheral end of the portion 34c.
And a ring-shaped second flexible film portion 34d coupled to
A valve spring 36 for urging the valve portion 34a in the seating direction between the valve seats 30 and 31 is contracted between the valve portion 34a and the input rod 20. The control valve 38 is constituted by the negative pressure introduction valve seat 30, the atmosphere introduction valve seat 31, the valve body 34 and the valve spring 36.
【００１９】前記弁体３４の取付けビード部３４ｂ及び
第１可撓膜部３４ｃの前面には，第２可撓膜部３４ｄを
囲繞する環状の支承板４３が当接するように配置され，
この支承板４３は，弁筒１０の内周面に形成された環状
段部４４に当接して前方への移動が阻止される。また取
付けビード部３４ｂは，弁筒１０の内周面に嵌合する筒
状の弁ホルダ３５の外周溝３５ａに係合されると共に，
この弁ホルダ３５と支承板４３とで挟持される。この弁
ホルダ３５を，その挟持位置に保持するために，弁ホル
ダ３５に後端外周に突設された係止爪４７が，弁筒１０
内周面に形成された環状溝４６に係合される。こうして
取付けビード部３４ｂは，支承板４３と共に弁筒１０の
内周面に固定される。An annular support plate 43 surrounding the second flexible film portion 34d is disposed in front of the mounting bead portion 34b of the valve body 34 and the front surface of the first flexible film portion 34c so as to abut.
The bearing plate 43 abuts against an annular step portion 44 formed on the inner peripheral surface of the valve cylinder 10 and is prevented from moving forward. The mounting bead portion 34b is engaged with an outer peripheral groove 35a of a cylindrical valve holder 35 fitted to the inner peripheral surface of the valve cylinder 10, and
The valve holder 35 is held between the support plate 43 and the valve holder 35. In order to hold the valve holder 35 at its clamping position, a locking claw 47 protruding from the outer periphery of the rear end of the valve holder 35 is provided with a valve cylinder 10.
It is engaged with an annular groove 46 formed on the inner peripheral surface. Thus, the mounting bead portion 34b is fixed to the inner peripheral surface of the valve cylinder 10 together with the support plate 43.
【００２０】上記弁ホルダ３５と入力杆２０との間に
は，入力杆２０を後退方向へ付勢する入力戻しばね４１
が縮設される。An input return spring 41 for urging the input rod 20 in the backward direction is provided between the valve holder 35 and the input rod 20.
Is contracted.
【００２１】さらに弁筒１０には第１及び第２ポート２
８，２９が設けられる。第１ポート２８は，前記負圧室
２に連なると共に負圧導入弁座３０及び取付けビード部
３４ｂ間の弁筒１０内周面に開口し，第２ポート２９
は，前記作動室３に連なると共に負圧導入弁座３０及び
大気導入弁座３１間の弁筒１０内周面に開口する。Further, the valve cylinder 10 has first and second ports 2.
8, 29 are provided. The first port 28 communicates with the negative pressure chamber 2 and opens on the inner peripheral surface of the valve cylinder 10 between the negative pressure introducing valve seat 30 and the mounting bead portion 34b.
Is connected to the working chamber 3 and opens on the inner peripheral surface of the valve cylinder 10 between the negative pressure introducing valve seat 30 and the atmosphere introducing valve seat 31.
【００２２】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 covering the valve cylinder 10 are attached. An air 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.
【００２３】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３２が
一定距離の範囲で軸方向移動可能に取付けられる。この
キー３２は，前記弁ピストン１８及び反力ピストン１７
間の頸部１８ｂを跨ぐフォーク部３２ａを内端に有する
と共に，その外端３２ｂが前記後部シェル半体１ｂの支
持筒部１２に設けられたストッパ壁１９の前面に対向す
るように配置される。而して，キー３２がストッパ壁１
９に当接することによりブースタピストン４及び弁筒１
０の後退限が規定され，また反力ピストン１７の後端面
がキー３２に当接することにより弁ピストン１８及び入
力杆２０の後退限が規定される。前記頸部１８ｂの軸方
向長さはキー３２の板厚より大きく設定されていて，弁
ピストン１８とキー３２とが僅かに相対移動ができるよ
うになっている。Further, a key 32 for limiting the retraction limit of the booster piston 4 and the valve piston 18 is attached to the valve cylinder 10 so as to be movable in the axial direction within a certain distance. The key 32 is used for the valve piston 18 and the reaction force piston 17.
A fork portion 32a straddling the neck portion 18b is provided at the inner end, and the outer end 32b is disposed so as to face the front surface of the stopper wall 19 provided on the support tube portion 12 of the rear shell half 1b. . Thus, the key 32 is connected to the stopper wall 1.
9, the booster piston 4 and the valve cylinder 1
A retraction limit of 0 is defined, and the retraction limit of the valve piston 18 and the input rod 20 is defined by the rear end face of the reaction force piston 17 abutting on the key 32. The axial length of the neck portion 18b is set to be larger than the thickness of the key 32, so that the valve piston 18 and the key 32 can slightly move relative to each other.
【００２４】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.
【００２５】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.
【００２６】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 piston 17, the elastic piston 22 and the cup 21 constitute a reaction mechanism 24 for feeding back a part of the output of the output rod 25 to the input rod 20.
【００２７】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 so as to contact the front end surfaces of the cup body 21 and 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.
【００２８】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.
【００２９】負圧ブースタＢの休止状態では，図１及び
図２に示すように，弁筒１０に取付けられたキー３２が
後部シェル半体１ｂのストッパ壁１９前面に当接し，こ
のキー３２に反力ピストン１７の後端面が当接すること
により，ブースタピストン４及び入力杆２０が後退限に
位置している。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の付勢力により前記後退位置に保持され
る。When the negative pressure booster B is at rest, the key 32 attached to the valve cylinder 10 contacts the front surface of the stopper wall 19 of the rear shell half 1b, as shown in FIGS. When the rear end face of the reaction force piston 17 abuts, the booster piston 4 and the input rod 20 are located at the retreat limit. At this time, the air introduction valve seat 31 is
While closely contacting the valve portion 34a, the valve portion 34a is pressed to be slightly separated from the negative pressure introducing valve seat 30. As a result, communication between the air inlet 39 and the second port 29 is cut off, while communication between the first and second ports 28, 29 is established, and thus the negative pressure in the negative pressure chamber 2 is reduced.
The booster piston 4 and the valve cylinder 10 are held in the retracted position by the urging force of the booster return spring 27 because the pressures in the two chambers 2 and 3 are the same.
【００３０】また負圧室２の負圧は，弁ピストン１８及
び大気導入弁座３１の前面や，弁体３４の弁部３４ａ及
び第１可撓膜部３４ｃの前面にも作用するため，この負
圧と，大気導入弁座３１の外側の大気圧との気圧差によ
り，弁ピストン１８及び弁体３４に前方への引き込み力
が働くが，第１可撓膜部３４ｃに働く前方引き込み力
は，弁筒１０に固定された支承板４３に受け止められる
ため，弁ピストン１８及び弁体３４から入力杆２０に伝
達する前方引き込み力は，環状の支承板４３の内径ｄに
前記気圧差を乗じた値となる。こうして，弁体３４の第
１可撓膜部３４ｃに働く前方引き込み力の，入力杆２０
への伝達が阻止されるので，その分だけ入力戻しばね４
１のセット荷重を下げても，弁ピストン１８及び弁体３
４の前方引き込み力に抗して入力杆２０を所定の後退限
に保持することができる。このことは，ブレーキペダル
Ｐによる入力杆２０への初期操作入力を軽減し得ること
を意味する。The negative pressure in the negative pressure chamber 2 also acts on the front surfaces of the valve piston 18 and the air introduction valve seat 31, and also on the front surfaces of the valve portion 34a and the first flexible film portion 34c of the valve body 34. Due to the pressure difference between the negative pressure and the atmospheric pressure outside the air introduction valve seat 31, a forward retraction force acts on the valve piston 18 and the valve body 34, but the forward retraction force acting on the first flexible membrane portion 34c is , Received by the support plate 43 fixed to the valve cylinder 10, the forward retraction force transmitted from the valve piston 18 and the valve body 34 to the input rod 20 is obtained by multiplying the inner diameter d of the annular support plate 43 by the pressure difference. Value. Thus, the input rod 20 of the front retraction force acting on the first flexible film portion 34c of the valve body 34
To the input return spring 4
1, the valve piston 18 and the valve body 3
The input rod 20 can be held at a predetermined retreat limit against the front retraction force of No. 4. This means that the initial operation input to the input rod 20 by the brake pedal P can be reduced.
【００３１】したがって，いま，車両を制動すべくブレ
ーキペダルＰを軽く踏み込んでも，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
前進させることができる。すると，図３に示すように，
弁ピストン１８の前進に伴い，弁ばね３６の付勢力が第
２可撓膜部３４ｄ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。そ
の結果，大気導入口３９から弁筒１０内に流入した大気
は大気導入弁座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の力に抗して前進するので，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１
７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，図５に線ａ−ｂで
示すように急速に立ち上がるジャンピング特性を示す。
このように，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。Therefore, even if the brake pedal P is lightly depressed to brake the vehicle, the input rod 20 can be advanced together with the valve piston 18 against the set load of the input return spring 41. Then, as shown in FIG.
With the advance of the valve piston 18, the urging force of the valve spring 36 causes the valve portion 34a to be seated on the negative pressure introducing valve seat 30 while extending the second flexible film portion 34d, and at the same time, the atmosphere introducing valve seat 31 becomes the valve body 34. From the first and second ports 28,
The communication between the second and third ports 29 is cut off, and the second port 29 is communicated with the atmosphere inlet 39 through the inside of the valve body 34. As a result, the air flowing into the valve cylinder 10 from the air inlet 39 passes through the air inlet valve seat 31, is introduced into the working chamber 3 through the second port 29, and the working chamber 3 is set to a higher pressure than the negative pressure chamber 2. Therefore, the forward thrust based on the pressure difference is obtained, and the booster piston 4 resists the force of the booster return spring 27 together with the valve cylinder 10, the working piston 15, the elastic piston 22, the cup body 21 and the output rod 25. , The piston Mb of the brake master cylinder M is driven by the output rod 25. The elastic piston 22 is compressed by the reaction force generated by this driving, and a part of the elastic piston 22 swells into the small-diameter cylinder hole 16.
Since the above-mentioned reaction force is not transmitted to the input rod 20 until it comes into contact with the front surface of 7, the output of the output rod 25 shows a jumping characteristic that rises rapidly as shown by a line ab in FIG.
As described above, since the jumping characteristic is obtained by the relatively small initial operation input, the ineffective stroke of the brake master cylinder M and each wheel brake can be quickly eliminated, and the responsiveness of each wheel brake can be improved.
【００３２】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，図５の線ｂ−ｃで示すように増加する。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. Then, the output of the output rod 25 increases as shown by a line bc in FIG. 5 with a boosting 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.
【００３３】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ｃに達してからは，出力杆２５の出力
は，線ｃ−ｄに示すように，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 c at which the pressure difference between the negative pressure chamber 2 and the working chamber 3 is maximized, the output of the output rod 25 is changed to the booster piston 4 as shown by the line cd. The sum of the maximum thrust due to the pressure difference and the operation input to the input rod 20 is obtained.
【００３４】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４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, as shown in FIG. 4, the valve piston 18 causes the valve body 34 to be largely separated from the negative pressure introduction valve seat 30 while the air introduction valve seat 31 is seated on the valve body 34. 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.
【００３５】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.
【００３６】[0036]
【発明の効果】以上のように本発明によれば，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，該弁筒に前後
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，該弁ピストン及び該弁筒
間で前記入力杆の前後動に応じて前記作動室を前記負圧
室と大気とに連通切換えする制御弁と，前記入力杆を後
退方向へ付勢する入力戻しばねとを配設し，この制御弁
を，前記弁筒に形成された環状の負圧導入弁座と，前記
弁ピストンに形成されて前記負圧導入弁座の内側に配置
される大気導入弁座と，前記弁筒に前記負圧導入弁座及
び大気導入弁座に着座可能に対向する環状の弁部，前記
弁筒の内周面に固定的に保持される環状の取付けビード
部，前記取付けビード部から半径方向内方へ延びる環状
の第１可撓膜部，及びこの第１可撓膜部の内周端から軸
方向へ延びて前記弁部に結合する環状の第２可撓膜部か
らなる弁体と，前記弁部を前記負圧導入弁座及び大気導
入弁座との着座方向へ付勢する弁ばねとで構成し，前記
負圧導入弁座及び弁体間の弁筒内周面に前記負圧室に連
通する第１ポートを開口し，また前記負圧導入弁座及び
大気導入弁座間の弁筒内周面に前記作動室に連通する第
２ポートを開口し，前記弁部の内周側を大気に連通した
負圧ブースタにおいて，前記第２可撓膜部を囲繞して第
１可撓膜部の前面に当接する支承板を前記弁筒に固定し
たので，弁体の第１可撓膜部に前記気圧差による引き込
み力が加わっても，この第１可撓膜部に対する引き込み
力を支承板に受け止めさせることにより，その分，弁ピ
ストン及び弁体から入力杆に作用する前記気圧差による
引き込み力を減少させることができ，したがって入力戻
しばねのセット荷重を下げることが可能となり，入力杆
への初期操作入力の低減を図ることができる。As described above, according to the present invention, the booster shell houses the booster piston partitioning the interior into a front negative pressure chamber connected to a negative pressure source and a rear working chamber. A valve piston slidably fitted to the valve cylinder in a front-rear direction with a valve cylinder connected to the piston, an input rod connecting a front end of the valve piston to the valve piston; A control valve for switching the working chamber between the negative pressure chamber and the atmosphere in accordance with the forward and backward movement of the input rod, and an input return spring for urging the input rod in a backward direction are provided. An annular negative pressure introducing valve seat formed on the valve cylinder, an atmosphere introducing valve seat formed on the valve piston and disposed inside the negative pressure introducing valve seat, and introducing the negative pressure into the valve cylinder. An annular valve portion which is seatably opposed to the valve seat and the air introduction valve seat, and which is fixed to the inner peripheral surface of the valve cylinder; An annular mounting bead portion, which is held in a fixed manner, an annular first flexible film portion extending radially inward from the mounting bead portion, and an axially extending one extending from an inner peripheral end of the first flexible film portion. A valve body composed of an annular second flexible membrane portion coupled to the valve portion, and a valve spring for urging the valve portion in a seating direction of the negative pressure introduction valve seat and the atmosphere introduction valve seat, A first port communicating with the negative pressure chamber is opened on the inner peripheral surface of the valve cylinder between the negative pressure introducing valve seat and the valve body. In a negative pressure booster in which a second port communicating with the working chamber is opened and an inner peripheral side of the valve portion communicates with the atmosphere, the negative pressure booster surrounds the second flexible film portion and contacts a front surface of the first flexible film portion. Since the contacting support plate is fixed to the valve cylinder, even if the drawing force due to the pressure difference is applied to the first flexible film portion of the valve body, the first flexible film portion is prevented. By receiving the retracting force on the support plate, the retracting force due to the pressure difference acting on the input rod from the valve piston and the valve body can be reduced accordingly, so that the set load of the input return spring can be reduced. This makes it possible to reduce the initial operation input to the input rod.
【図１】本発明の一実施例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 an embodiment of 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】倍力作動状態を示す，図２に対応した作用説明
図。FIG. 3 is an operation explanatory view corresponding to FIG. 2 and showing a boost operation state.
【図４】倍力解除過程を示す，図２に対応した作用説明
図。FIG. 4 is an operation explanatory view corresponding to FIG. 2, showing a boost cancellation process;
【図５】上記負圧ブースタの倍力特性線図。FIG. 5 is a boosting characteristic diagram of the negative pressure booster.
【図６】従来の負圧ブースタにおける制御弁部の断面
図。FIG. 6 is a sectional view of a control valve section in a conventional negative pressure booster.
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 １０・・・弁筒 １８・・・弁ピストン ２０・・・入力杆 ２８・・・第１ポート ２９・・・第２ポート ３０・・・負圧導入弁座 ３１・・・大気導入弁座 ３４・・・弁体 ３４ａ・・弁部 ３４ｂ・・取付けビード部 ３４ｃ・・第１可撓膜部 ３４ｄ・・第２可撓膜部 ３６・・・弁ばね ３８・・・制御弁 ４３・・・支承板 B: Negative pressure booster V: Negative pressure source 1 Booster shell 2 Negative pressure chamber 3 Working chamber 4 Booster piston 10 Valve Cylinder 18 ... Valve piston 20 ... Input rod 28 ... First port 29 ... Second port 30 ... Negative pressure introduction valve seat 31 ... Atmospheric introduction valve seat 34 ... Valve element 34a ··· Valve part 34b ··· Mounting bead part 34c ··· First flexible film part 34d ··· Second flexible film part 36 ... Valve spring 38 ... Control valve 43 ... Bearing plate
Claims (1)
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，該弁筒（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，該弁ピストン（１８）及び
該弁筒（１０）間で前記入力杆（２０）の前後動に応じ
て前記作動室（３）を前記負圧室（２）と大気とに連通
切換えする制御弁（３８）と，前記入力杆（２０）を後
退方向へ付勢する入力戻しばね（４１）とを配設し，こ
の制御弁（３８）を，前記弁筒（１０）に形成された環
状の負圧導入弁座（３０）と，前記弁ピストン（１８）
に形成されて前記負圧導入弁座（３０）の内側に配置さ
れる大気導入弁座（３１）と，前記弁筒（１０）に前記
負圧導入弁座（３０）及び大気導入弁座（３１）に着座
可能に対向する環状の弁部（３４ａ），前記弁筒（１
０）の内周面に固定的に保持される環状の取付けビード
部（３４ｂ），前記取付けビード部（３４ｂ）から半径
方向内方へ延びる環状の第１可撓膜部（３４ｃ），及び
この第１可撓膜部（３４ｃ）の内周端から軸方向へ延び
て前記弁部（３４ａ）に結合する環状の第２可撓膜部
（３４ｄ）からなる弁体（３４）と，前記弁部（３４
ａ）を前記負圧導入弁座（３０）及び大気導入弁座（３
１）との着座方向へ付勢する弁ばね（３６）とで構成
し，前記負圧導入弁座（３０）及び弁体（３４）間の弁
筒（１０）内周面に前記負圧室（２）に連通する第１ポ
ート（２８）を開口し，また前記負圧導入弁座（３０）
及び大気導入弁座（３１）間の弁筒（１０）内周面に前
記作動室（３）に連通する第２ポート（２９）を開口
し，前記弁部（３４ａ）の内周側を大気に連通した負圧
ブースタにおいて，前記第２可撓膜部（３４ｄ）を囲繞
して第１可撓膜部（３４ｃ）の前面に当接する支承板
（４３）を前記弁筒（１０）に固定したことを特徴す
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) connecting a front end to the valve piston (18), and the valve piston (18). 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); An input return spring (41) for urging the input rod (20) in the backward direction is provided, and the control valve (38) is connected to an annular negative pressure introducing valve seat (10) formed in the valve cylinder (10). 30) and the valve piston (18)
And an air introduction valve seat (31) arranged inside the negative pressure introduction valve seat (30), and the negative pressure introduction valve seat (30) and the air introduction valve seat ( 31), an annular valve portion (34a) which is seatably opposed to the valve cylinder (1).
0), an annular mounting bead portion (34b) fixedly held on the inner peripheral surface, an annular first flexible film portion (34c) extending radially inward from the mounting bead portion (34b), and A valve body (34) comprising an annular second flexible film portion (34d) extending in an axial direction from an inner peripheral end of the first flexible film portion (34c) and coupled to the valve portion (34a); Part (34
a) is replaced with the negative pressure introduction valve seat (30) and the atmosphere introduction valve seat (3).
1) and a valve spring (36) for urging in the seating direction. The negative pressure chamber is provided on the inner peripheral surface of the valve cylinder (10) between the negative pressure introducing valve seat (30) and the valve element (34). The first port (28) communicating with (2) is opened, and the negative pressure introduction valve seat (30) is opened.
A second port (29) communicating with the working chamber (3) is opened in the inner peripheral surface of the valve cylinder (10) between the air introduction valve seat (31) and the inner peripheral side of the valve portion (34a). A support plate (43) surrounding the second flexible membrane (34d) and abutting against the front surface of the first flexible membrane (34c) is fixed to the valve cylinder (10). Negative pressure booster characterized by doing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000024795A JP2001213303A (en) | 2000-01-28 | 2000-01-28 | Negative pressure booster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000024795A JP2001213303A (en) | 2000-01-28 | 2000-01-28 | Negative pressure booster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001213303A true JP2001213303A (en) | 2001-08-07 |
Family
ID=18550729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000024795A Pending JP2001213303A (en) | 2000-01-28 | 2000-01-28 | Negative pressure booster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001213303A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7549711B2 (en) * | 2002-06-21 | 2009-06-23 | Nissin Kogyo Co., Ltd. | Vacuum pressure booster |
| CN116447179A (en) * | 2023-06-20 | 2023-07-18 | 烟台亮远液压技术有限公司 | Hydraulic supercharger capable of simultaneously outputting pushing force and pulling force |
-
2000
- 2000-01-28 JP JP2000024795A patent/JP2001213303A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7549711B2 (en) * | 2002-06-21 | 2009-06-23 | Nissin Kogyo Co., Ltd. | Vacuum pressure booster |
| CN116447179A (en) * | 2023-06-20 | 2023-07-18 | 烟台亮远液压技术有限公司 | Hydraulic supercharger capable of simultaneously outputting pushing force and pulling force |
| CN116447179B (en) * | 2023-06-20 | 2023-08-18 | 烟台亮远液压技术有限公司 | Hydraulic supercharger capable of simultaneously outputting pushing force and pulling force |
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