JPS593298B2 - Negative pressure booster - Google Patents
Negative pressure boosterInfo
- Publication number
- JPS593298B2 JPS593298B2 JP55133316A JP13331680A JPS593298B2 JP S593298 B2 JPS593298 B2 JP S593298B2 JP 55133316 A JP55133316 A JP 55133316A JP 13331680 A JP13331680 A JP 13331680A JP S593298 B2 JPS593298 B2 JP S593298B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- booster
- working chamber
- valve
- booster piston
- 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.)
- Expired
Links
Landscapes
- Diaphragms And Bellows (AREA)
- Braking Systems And Boosters (AREA)
Description
【発明の詳細な説明】
本発明は、主として自動車のブレーキマスクシリンダを
負圧力を以て倍力作動する負圧式倍力装置、特に車体に
取付けられるブースタシェル内部を、それに前後往復動
自在に収容したブースタピストンと、そのブースタピス
トンの後面に内周部を固着すると共に外周部を前記ブー
スタシェルの内周面に固着したピストンダイヤフラムと
により負圧源に連なる前部の第１作動室と、制御弁を介
して前記第１作動室または大気との連通を切換え制御さ
れる後部の第２作動室とに区画し、前記ブースタピスト
ンに進退自在に連結した入力杆の前進時、それに前記ブ
ースタピストンを追従作動させるための気圧差が前記両
作動室間に生じるように、前記入力杆を前記制御弁に連
結した負圧式倍力装置の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a negative pressure booster that boosts the brake mask cylinder of an automobile using negative pressure, and in particular to a booster shell that is housed inside a booster shell that is attached to a vehicle body so as to be able to reciprocate back and forth. A piston and a piston diaphragm having an inner peripheral part fixed to the rear surface of the booster piston and a piston diaphragm having an outer peripheral part fixed to the inner peripheral surface of the booster shell form a first working chamber at the front connected to a negative pressure source and a control valve. and a second working chamber at the rear whose communication with the first working chamber or the atmosphere is switched and controlled through the booster piston, and when an input rod movably connected to the booster piston moves forward, the booster piston follows the movement of the input rod. The present invention relates to an improvement in a negative pressure booster in which the input rod is connected to the control valve so that a pressure difference is generated between the two working chambers.
一般に、前記ピストンダイヤフラムは、それのブースタ
シェル内周面とブースタピストン外周面との間に位置す
る部分を第１作動室側に突出するように断面Ｕ字形に折
曲げて設置され、このＵ字形折曲げ部の転勤によりブー
スタピストンの前進、後退を許容するものである。Generally, the piston diaphragm is installed by bending a portion located between the inner circumferential surface of the booster shell and the outer circumferential surface of the booster piston into a U-shaped cross section so as to protrude toward the first working chamber. This allows the booster piston to move forward and backward by shifting the bent portion.
しかしながら、負圧源に負圧が発生していないとき、ま
たは負圧源と第１作動室とを連通ずる管路が故障してい
るとき等、第１作動室に負圧が蓄えられていない状態で
ブレーキペダルを踏込みブースタピストンを前進させる
と、第１作動室の空気が管路抵抗等によって負圧源側に
十分に排出されず、その結果残留空気が圧縮されて第１
作動室の気圧が第２作動室のそれよりも高くなり、その
気圧差によりピストンダイヤフラムが第２作動室側に膨
出し、またそのＵ字形折曲げ部が反転するおそれがある
。However, when negative pressure is not generated in the negative pressure source, or when the pipe connecting the negative pressure source and the first working chamber is broken, negative pressure is not stored in the first working chamber. When the brake pedal is pressed to move the booster piston forward in this state, the air in the first working chamber is not sufficiently discharged to the negative pressure source side due to pipe resistance, etc., and as a result, the residual air is compressed and the first working chamber is moved forward.
The pressure in the working chamber becomes higher than that in the second working chamber, and the piston diaphragm bulges toward the second working chamber due to the pressure difference, and there is a risk that the U-shaped bent portion of the piston diaphragm may be reversed.
このような無用な圧力がピストンダイヤフラムに加わる
ことは、ピストンダイヤフラムの耐久性を低下させるの
で好ましくない。The application of such unnecessary pressure to the piston diaphragm is undesirable because it reduces the durability of the piston diaphragm.
本発明は上記の点に鑑み、第１作動室内に負圧が蓄えら
れていない状態で、ブースタピストンの前進により第１
作動室の気圧が第２作動室のそれよりも高くなれば、前
記ピストンダイヤフラム内周部とブースタピストンとの
相対回動を防止する位置決め機構を利用して直ちに両作
動室間を連通させ、それらの気圧を均衡させてピストン
ダイヤフラムに前記のような無用な圧力が作用するのを
回避し得るようにした、簡単有効な前記装置を提供する
ことを目的とする。In view of the above-mentioned points, the present invention has been developed by moving the booster piston forward in a state where no negative pressure is stored in the first working chamber.
When the pressure in the working chamber becomes higher than that in the second working chamber, the positioning mechanism that prevents relative rotation between the inner periphery of the piston diaphragm and the booster piston is used to immediately establish communication between the two working chambers. It is an object of the present invention to provide a simple and effective device which can avoid unnecessary pressure acting on the piston diaphragm by balancing the air pressure of the piston diaphragm.
以下、図面により本発明の実施例について説明する。Embodiments of the present invention will be described below with reference to the drawings.
負圧式倍力装置Ｓのブースタシェル１は軽量な薄肉鋼板
または合成樹脂より成形された前後一対の椀状体１Ｆ、
１Ｒよりなり、その後部椀状体１Ｒの開口部に円周上等
間隔に突設された複数の爪片１ａを前部椀状体１Ｒの開
口部に円周上等間隔に形成された複数の切欠き１ｂに係
合させて両腕状体ＩＦ、ＩＲ相互の位置決めが行われ、
そして両腕状体ＩＦ、ＩＲはそれらの前後対向壁間を２
本のタイロッド３０を介して連結される。The booster shell 1 of the negative pressure booster S includes a pair of front and rear bowl-shaped bodies 1F molded from a lightweight thin-walled steel plate or synthetic resin;
1R, and a plurality of claw pieces 1a protruding from the opening of the rear bowl-shaped body 1R at equal intervals on the circumference, and a plurality of claw pieces 1a formed at the opening of the front bowl-shaped body 1R at equal intervals on the circumference. The two arm-like bodies IF and IR are mutually positioned by engaging with the notch 1b of the
And both arm-like bodies IF and IR have 2 points between their front and back opposing walls.
They are connected via tie rods 30.
このブースタシェル１とタイロッド３０との連結構造に
ついては後述する。The connection structure between the booster shell 1 and the tie rod 30 will be described later.
ブースタシェル１の内部には、ブースタピストン２が前
後往復動自在に収容され、そのブースタピストン２の後
面に環状溝６１が形成される。A booster piston 2 is housed inside the booster shell 1 so as to be able to reciprocate back and forth, and an annular groove 61 is formed in the rear surface of the booster piston 2.
ピストンダイヤフラム３の外周部と内周部には環状ビー
ド３ａ 、３ｂがそれぞれ形成されており、その外周部
の環状ビート３ａは、その端面に円周上等間隔に突設さ
れた２個の位置決め突起３ｃをそれぞれ後部椀状体１Ｒ
の外周部に形成された各位置決め孔１ｃに嵌めて両腕状
体ＩＦ、ＩＲにより挟着される。Annular beads 3a and 3b are formed on the outer and inner peripheries of the piston diaphragm 3, respectively. The protrusions 3c are connected to the rear bowl-shaped body 1R, respectively.
It is fitted into each positioning hole 1c formed on the outer periphery of and sandwiched between both arm-shaped bodies IF and IR.
内周部の環状ビード３ｂはブースタピストン３の環状溝
６１に嵌着され、このピストンダイヤフラム３とブース
タピストン２とにより、ブースタシェル１の内部は、前
部の第１作動室Ａと、後部の第２作動室Ｂとに区画され
る。The annular bead 3b on the inner circumference is fitted into the annular groove 61 of the booster piston 3, and the piston diaphragm 3 and the booster piston 2 separate the inside of the booster shell 1 into a first working chamber A at the front and a first working chamber A at the rear. It is divided into a second working chamber B.
ピストンダイヤフラム３の受圧部３ｄは、ブースタピス
トン２の後面に密着すると共に、ブースタピストン２の
外周面と前部椀状体１Ｆの内周面との間において第１作
動室内側に突出するよ５Ｕ字形に折曲げられ、このＵ字
形折曲げ部の転勤によりブースタピストン２の前進、後
退を許容する。The pressure receiving portion 3d of the piston diaphragm 3 is in close contact with the rear surface of the booster piston 2, and protrudes toward the first working chamber between the outer circumferential surface of the booster piston 2 and the inner circumferential surface of the front bowl-shaped body 1F. The U-shaped bent portion allows the booster piston 2 to move forward and backward by shifting the U-shaped bent portion.
ブースタピストン２の前記環状溝６１の後側壁６１ａに
は切欠き６５を設け、ピストンダイヤフラム３の内周環
状ビード３ｂの上記切欠き６５に臨む部分を薄肉部６３
に形成して、それをブースタピストン２の後面に離間自
在に密着させる。A notch 65 is provided in the rear wall 61a of the annular groove 61 of the booster piston 2, and a thin wall portion 63 is formed in the portion of the inner peripheral annular bead 3b of the piston diaphragm 3 facing the notch 65.
It is formed into a shape and is closely attached to the rear surface of the booster piston 2 so that it can be freely separated.
さらに、上記薄肉部６３０周縁からはチャンネル状の位
置決め突壁６４を一体に起立させ、この突壁６４を前記
切欠き６５に係合する。Further, a channel-shaped positioning projecting wall 64 is integrally raised from the peripheral edge of the thin portion 630, and this projecting wall 64 is engaged with the notch 65.
この係合によりブースタピストン２とダイヤフラム３と
の相対回動が拘束される。This engagement restricts relative rotation between the booster piston 2 and the diaphragm 3.
第１作動室Ａは負圧導入管４を介して負圧源である内燃
機関の吸気マニホールド（図示せず）内に常時連通し、
第２作動室Ｂは後述する制御弁５を介して第１作動室Ａ
またはブースタシェル１の後方延長筒１ｄの端壁１ｅに
開口する大気導入口６に交互に連通切換え制御されるよ
うになっている。The first working chamber A is constantly in communication with an intake manifold (not shown) of the internal combustion engine, which is a negative pressure source, through a negative pressure introduction pipe 4.
The second working chamber B is connected to the first working chamber A via a control valve 5 which will be described later.
Alternatively, communication is alternately controlled by the atmosphere inlet 6 opened in the end wall 1e of the rear extension tube 1d of the booster shell 1.
ブースタピストン２は第１作動室Ａに縮設された戻しば
ね７により常時後退方向、即ち第１作動室内側に弾発さ
れ、その後退限はピストンダイヤフラム３の背面に***
形成した突起３ｅがブースタシェル１の後壁内面に当接
することにより規制される。The booster piston 2 is always urged in the backward direction, that is, toward the inside of the first working chamber, by a return spring 7 contracted in the first working chamber A, and its backward limit is reached by a protrusion 3e formed protrudingly formed on the back surface of the piston diaphragm 3. It is regulated by coming into contact with the inner surface of the rear wall of the shell 1.
ブースタピストン２には、その中心部後面から軸方向に
突出する弁筒８を一体に形成し、これを前記延長筒１ｄ
に設けた平軸受９に摺動自在に支承させると共にその後
端を前記大気導入口６に向って開放する。The booster piston 2 is integrally formed with a valve cylinder 8 that protrudes in the axial direction from the rear surface of its central portion, and is connected to the extension cylinder 1d.
It is slidably supported by a flat bearing 9 provided at the rear end thereof, and its rear end is opened toward the atmosphere inlet 6.
弁筒８内には、制御弁５を次のように構成する。The control valve 5 is configured in the valve cylinder 8 as follows.
即ち、弁筒８の前部内壁に環状の第１弁座１０□を形成
し、弁筒８の前部には、入力杆１１に連結されてその前
端部を構成する弁ピストン１２を摺合し、この弁ピスト
ン１２後端に前記第１弁座１０、に囲繞される環状の第
２弁座１０□を形成する。That is, an annular first valve seat 10□ is formed on the inner wall of the front part of the valve cylinder 8, and a valve piston 12 connected to the input rod 11 and forming the front end thereof is slidably connected to the front part of the valve cylinder 8. An annular second valve seat 10 □ surrounded by the first valve seat 10 is formed at the rear end of the valve piston 12 .
弁筒８の内壁には、両端を開放した筒状の弁体１３の基
端部１３ａを弁筒８に嵌着される弁体保持筒１４を介し
て挟止する。A base end 13a of a cylindrical valve body 13 with both ends open is clamped on the inner wall of the valve cylinder 8 via a valve body holding cylinder 14 fitted into the valve cylinder 8.
この弁体１３はゴム等の弾性材より形成されたもので、
その基端部１３ａから薄肉のダイヤフラム１３ｂが半径
方向内方へ延出し、その内周端に厚肉の弁部１３ｃが連
設されており、その弁部１３ｃを前記第１および第２弁
座１０１．１０２と対向させる。This valve body 13 is made of an elastic material such as rubber.
A thin-walled diaphragm 13b extends radially inward from the base end 13a, and a thick-walled valve portion 13c is connected to the inner peripheral end of the diaphragm 13b, and the valve portion 13c is connected to the first and second valve seats. 101 and 102.
而して弁部１３ｃはダイヤフラム１３ｂの変形により前
後に移動でき、そして弁体保持筒１４の前端面に当接す
ることもできる。Thus, the valve portion 13c can move back and forth by deforming the diaphragm 13b, and can also come into contact with the front end surface of the valve body holding cylinder 14.
弁部１３ｃには環状の補強板１５を埋設し、これに弁部
１３ｃを両弁座１０１．１０□に向って付勢すべく弁ば
ね１６を作用させる。An annular reinforcing plate 15 is embedded in the valve portion 13c, and a valve spring 16 acts on this to bias the valve portion 13c toward both valve seats 101.10□.
第１弁座１０１の外側部はブースタピストン２０通孔１
７を介して第１作動室Ａに、また第１および第２弁座１
０１．１０２の中間部は別の通孔１８を介して第２作動
室Ｂに、また第２弁座１０□の内側部は弁体１３内部を
介して大気導入口６にそれぞれ常時連通する。The outer part of the first valve seat 101 has the booster piston 20 through hole 1
7 to the first working chamber A, and the first and second valve seats 1
01.102 is always in communication with the second working chamber B through another through hole 18, and the inner part of the second valve seat 10□ is in constant communication with the atmosphere inlet 6 through the inside of the valve body 13.
ブースタピストン２には、その前面中心部に開口する大
径孔１９と、その大径孔１９の奥部端面に開口する小径
孔２０とを設け、その大径孔１９にその奥よりゴム等よ
りなる弾性ピストン２１およびそれと同径の出力ビスト
ン２２を順次摺合し、また小径孔２０には弾性ピストン
２１より小径の反動ピストン２３を摺合し、さらに小径
孔２０には前記弁ピストン１２の前端面から突出する小
軸１２ａを突入させて反動ピストン２３の後端面に対向
させる。The booster piston 2 is provided with a large-diameter hole 19 that opens at the center of its front surface and a small-diameter hole 20 that opens at the inner end of the large-diameter hole 19. An elastic piston 21 and an output piston 22 having the same diameter are sequentially slid together, and a reaction piston 23 having a smaller diameter than the elastic piston 21 is slid into the small diameter hole 20. The protruding small shaft 12a is inserted to face the rear end surface of the reaction piston 23.
出力ビストン２２は前方に突出する出力杆２２ａを一体
に有する。The output piston 22 integrally has an output rod 22a that projects forward.
入力杆１１は戻しばね２４により常時後退方向へ弾発さ
れ、その後退限は、入力杆１１に螺合して取付けた可動
ストッパ板２５が後方延長筒１ｄの端壁１ｅの内側に当
接することにより規制される。The input rod 11 is always urged in the backward direction by the return spring 24, and its retreat limit is reached when the movable stopper plate 25 screwed onto the input rod 11 comes into contact with the inside of the end wall 1e of the rear extension tube 1d. regulated by.
而して可動ストッパ板２５を回転すれば、それと入力杆
１１との螺合位置が変わるので入力杆１１の後退限を前
後に調節することができる。When the movable stopper plate 25 is rotated, the screwing position between the movable stopper plate 25 and the input rod 11 changes, so that the retraction limit of the input rod 11 can be adjusted back and forth.
その調節後の可動ストッパ板２５の固定は、同じく入力
杆１１に螺合したロックナツト２６の緊締により行われ
る。After the adjustment, the movable stopper plate 25 is fixed by tightening a lock nut 26 which is also screwed onto the input rod 11.
可動ストッパ板２５にはこれが前記大気導入口６を閉塞
しないように通気孔２７を穿設する。A vent hole 27 is bored in the movable stopper plate 25 so that the movable stopper plate 25 does not block the air inlet 6.
弁筒８の外端開口部には大気導入口６からの導入空気を
浄化し、且つ入力杆１１の作動を妨げないように変形し
得るフィルタ２８，２９を装着する。Filters 28 and 29 are attached to the outer end opening of the valve cylinder 8 to purify the air introduced from the atmosphere inlet 6 and to be deformable so as not to interfere with the operation of the input rod 11.
次に、タイロッド３０とブースタシェル１との連結構造
について説明する。Next, the connection structure between the tie rod 30 and the booster shell 1 will be explained.
タイロッド３０には、ブースタシェル１前壁を貫通して
その前方へ突出する取付ボルト３３を一体に形成し、ま
たブースタシェル１前壁の内面に当接するばね受板３４
を固着する。The tie rod 30 is integrally formed with a mounting bolt 33 that penetrates the front wall of the booster shell 1 and projects forward thereof, and also has a spring receiving plate 34 that comes into contact with the inner surface of the front wall of the booster shell 1.
to fix.
そしてブースタシェル１前面に重ねたブレーキマスクシ
リンダＭの取付フランジ３６に上記取付ボルト３３を貫
通し、その先端にナツト３５を螺合緊締することにより
タイロッド３０、ばね受板３４、ブースタシェル１前壁
および取付フランジ３６０四者を一体に連結する。Then, the mounting bolt 33 is passed through the mounting flange 36 of the brake mask cylinder M stacked on the front surface of the booster shell 1, and the nut 35 is screwed onto the tip of the bolt 33 and tightened. and a mounting flange 360 to connect the four parts together.
その際、ボルト３３を囲繞するようにばね受板３４の前
面に形成された環状溝３７に、ブースタシェル１前壁の
タイロッド貫通孔を封緘する環状シール部材３８を嵌装
する。At this time, an annular seal member 38 for sealing the tie rod through hole in the front wall of the booster shell 1 is fitted into an annular groove 37 formed on the front surface of the spring receiving plate 34 so as to surround the bolt 33.
上記ばね受板３４は前記戻しばね７の固定端を支承する
もので、戻しばね７０弾発力をタイロッド３０に負担さ
せてブースタシェル１へ・の負担を取除（ことができる
。The spring receiving plate 34 supports the fixed end of the return spring 7, and allows the elastic force of the return spring 70 to be borne by the tie rod 30, thereby relieving the load on the booster shell 1.
さらに、タイロッド３０には、ブースタシェル１後壁を
貫通してその後方に突出する取付ボルト３９と、ブース
タシェル１後壁の内面に当接する段付フランジ４１とを
一体に形成し、ブースタシェル１後壁の内面に溶接して
固着した支筒４３に上記段付フランジ４１を嵌入し、そ
れの抜止め環４２を支筒４３に係止することによりタイ
ロッド３０とブースタシェル１後壁とを一体に連結する
。Further, the tie rod 30 is integrally formed with a mounting bolt 39 that penetrates the rear wall of the booster shell 1 and projects rearward thereof, and a stepped flange 41 that abuts the inner surface of the rear wall of the booster shell 1. The stepped flange 41 is fitted into the support tube 43 that is welded and fixed to the inner surface of the rear wall, and its retaining ring 42 is locked to the support tube 43, thereby integrating the tie rod 30 and the rear wall of the booster shell 1. Connect to.
その際、段付フランジ４１の小径部と支筒４３間の環状
溝４４に、ブースタシェル１後壁のタイロッド貫通孔を
封緘する環状シール部材４５を嵌装する。At this time, an annular seal member 45 for sealing the tie rod through hole in the rear wall of the booster shell 1 is fitted into the annular groove 44 between the small diameter portion of the stepped flange 41 and the support tube 43.
上記取付ボルト３９は、これを自動車の車室前部壁Ｗに
貫通し、その先端にナツト４０を螺合緊締することによ
りタイロッド３０を車室前部壁に固着する。The mounting bolt 39 passes through the front wall W of the vehicle compartment, and a nut 40 is screwed onto the tip thereof and tightened to fix the tie rod 30 to the front wall of the vehicle compartment.
かくしてブースタシェル１はタイロッド３０を介して車
室前部壁Ｗに取付けられ、またブレーキマスクシリンダ
Ｍはタイロッド３０を介してブースタシェル１に連結さ
れる。Thus, the booster shell 1 is attached to the front wall W of the vehicle interior via the tie rods 30, and the brake mask cylinder M is connected to the booster shell 1 via the tie rods 30.
タイロッド３０は、図示例では第２図に示すように、四
角形の一方の対角頂点に２本配設され、他の対角頂点に
おいて車室前部壁Ｗへの２本の取付専用ボルト６６がブ
ースタシェル１の後壁に溶接して固着される。In the illustrated example, as shown in FIG. 2, two tie rods 30 are arranged at one diagonal vertex of a rectangle, and two dedicated bolts 66 for attachment to the front wall W of the vehicle compartment are installed at the other diagonal vertex. is welded and fixed to the rear wall of the booster shell 1.
タイロッド３０が貫通するブースタピストン２の透孔３
１を、そのピストン２の作動を妨げないようにシールす
るためにブースタピストン２とりイロツド３０との間に
シール手段を施す。Through hole 3 of booster piston 2 through which tie rod 30 passes
A sealing means is provided between the booster piston 2 and the rod 30 in order to seal the piston 1 so as not to interfere with the operation of the piston 2.
そのシール手段は、ゴム等の弾性材より形成された蛇腹
状の伸縮ブーツ４６より構成され、第１作動室Ａにおい
てそのブーツ４６でタイロッド３０を囲繞し、その前端
４６ａをタイロッド３０の外周面に形成された環状溝４
７に、またその後端４６ｂを透孔３１にそれぞれ嵌着す
る。The sealing means is composed of a bellows-shaped retractable boot 46 made of an elastic material such as rubber, and the boot 46 surrounds the tie rod 30 in the first working chamber A, and its front end 46a is attached to the outer peripheral surface of the tie rod 30. Annular groove 4 formed
7, and the rear end 46b is fitted into the through hole 31, respectively.
車室において、倍力装置Ｓの入力杆１１の後端には、固
定ブラケット５０に枢支５１されるブレーキペダル５２
を連結金具５３を介して連結する。In the vehicle interior, at the rear end of the input rod 11 of the booster S, there is a brake pedal 52 that is pivotally supported 51 on a fixed bracket 50.
are connected via a connecting fitting 53.
５４はブレーキペダル５２を後方へ付勢する戻しばねで
ある。54 is a return spring that biases the brake pedal 52 rearward.
ブレーキマスクシリンダＭのシリンダ本体５５後端部は
ブースタシェル１前壁を貫通して第１作動室Ａ内にこれ
を突入させ、そのシリンダ本体５５内の作動ピストン５
６の後端に倍力装置Ｓの出力杆２２ａを対向させる。The rear end of the cylinder body 55 of the brake mask cylinder M penetrates the front wall of the booster shell 1 and enters the first working chamber A, and the working piston 5 in the cylinder body 55
The output rod 22a of the booster S is opposed to the rear end of the booster S.
次にこの実施例の作用について説明すると、図示の状態
は倍力装置の非作動状態を示すもので、互いに連結した
弁ピストン１２、入力杆１１およびブレーキペダル５２
は、可動ストッパ板５２が固定の端壁１ｅに当接する所
定の後退位置に戻しばね２４のばね力を以て保持され、
そして弁ピストン１２は第２弁座１０２を介して弁部１
３ｃの前面を押圧して、これを弁体保持筒１４の前面に
軽く接触させるまで後退させ、それによって第１弁座１
０１と弁部１３ｃ間に僅かな間隙ｇを形成している。Next, to explain the operation of this embodiment, the illustrated state shows the non-operating state of the booster, in which the valve piston 12, input rod 11 and brake pedal 52 are connected to each other.
is returned to a predetermined retracted position where the movable stopper plate 52 abuts the fixed end wall 1e and is held by the spring force of the spring 24,
The valve piston 12 is connected to the valve portion 1 via the second valve seat 102.
3c to move it back until it lightly contacts the front surface of the valve body holding cylinder 14, whereby the first valve seat 1
A slight gap g is formed between 01 and the valve portion 13c.
このような状態は前記した可動ストッパ板２５の調節に
より容易に得ることができる。Such a state can be easily obtained by adjusting the movable stopper plate 25 described above.
以上により、エンジン運転中、常に負圧を蓄えている第
１作動室Ａは通孔１７、間隙ｇおよび通孔１８を介して
第２作動室Ｂと連通し、また弁部１３ｃの前面開口部は
第２弁座１０２により閉鎖されるので、第２作動室Ｂに
は第１作動室Ａの負圧が伝達して両作動室Ａ、Ｂの気圧
が平衡している。As described above, during engine operation, the first working chamber A, which always stores negative pressure, communicates with the second working chamber B through the through hole 17, the gap g, and the through hole 18, and also through the front opening of the valve portion 13c. is closed by the second valve seat 102, so the negative pressure in the first working chamber A is transmitted to the second working chamber B, and the air pressures in both working chambers A and B are balanced.
したがってブースタピストン２も戻しばね７の弾発力を
以て図示の後退位置を占める。Therefore, the booster piston 2 also occupies the illustrated retracted position by the elastic force of the return spring 7.
いま、車両を制動すべくブレーキペダル５２を踏込み、
入力杆１１および弁ピストン１２を前進させれば、弁ば
ね１６により前方へ付勢される弁部１３ｃは弁ピストン
１２に追従して前進するが、第１弁座１０１と弁部１３
ｃとの間隙ｇが前述のように極めて狭いので、弁部１３
ｃは、直ちに第１弁座１０１に着座して両作動室Ａ、Ｂ
間の連通を遮断し、同時に第２弁座１０□は弁部１３ｃ
から離れて第２作動室Ｂを通孔１８および弁体１３内部
を介して大気導入口６に連通させる。Now, step on the brake pedal 52 to brake the vehicle,
When the input rod 11 and the valve piston 12 are moved forward, the valve portion 13c urged forward by the valve spring 16 moves forward following the valve piston 12, but the first valve seat 101 and the valve portion 13
Since the gap g with respect to c is extremely narrow as described above, the valve portion 13
c immediately seats on the first valve seat 101 and opens both working chambers A and B.
At the same time, the second valve seat 10□ is connected to the valve portion 13c.
The second working chamber B is communicated with the atmosphere inlet 6 through the through hole 18 and the inside of the valve body 13 .
したがって第２作動室Ｂには大気が素早く導入され、該
室Ｂが第１作動室Ａよりも高圧となり、両室Ａ。Therefore, the atmosphere is quickly introduced into the second working chamber B, and the pressure in the second working chamber B becomes higher than that in the first working chamber A.
Ｂ間に生じる気圧差によりブースタピストン２が戻しば
ね７に抗して前進して、弾性ピストン２１を介して出力
杆２２ａを前進させるので、ブレーキマスクシリンダＭ
の作動ピストン５６を前方へ駆動し、車両に制動がかけ
られる。The booster piston 2 moves forward against the return spring 7 due to the pressure difference generated between B and moves the output rod 22a forward via the elastic piston 21, so that the brake mask cylinder M
The actuating piston 56 of the vehicle is driven forward, and the vehicle is braked.
この場合、両作動室Ａ、Ｂ間に生じる気圧差により、環
状ビード３ｂの薄肉部６３はブースタピストン２に強く
密着するので、両作動室Ａ、Ｂ間は確実に遮断される。In this case, the thin wall portion 63 of the annular bead 3b comes into close contact with the booster piston 2 due to the pressure difference generated between the working chambers A and B, so that the working chambers A and B are reliably isolated.
上記作動ピストン５６の駆動時に、シリンダ本体５５に
前方へのスラスト荷重が作用するが、その荷重はタイロ
ッド３０を介して車体、即ち車室前部壁Ｗに伝達して支
承される。When the operating piston 56 is driven, a forward thrust load is applied to the cylinder body 55, and this load is transmitted to and supported by the vehicle body, that is, the front wall W of the vehicle compartment via the tie rod 30.
したがってブースタシェル１には上記荷重は作用しない
。Therefore, the above load does not act on the booster shell 1.
一方、弁ピストン１２の小軸１２ａはその前進により反
動ピストン２３を介して弾性ピストン２１に当接すると
、出力杆２２ａの作動反力による弾性ピストン２１の反
動ピストン２３側への膨出変形により前記反力の一部が
弁ピストン１２を介してブレーキペダル５２側にフィー
ドバックされ、それにより操縦者は出力杆２２ａの出力
、即ち制動力を感知することができる。On the other hand, when the small shaft 12a of the valve piston 12 comes into contact with the elastic piston 21 via the reaction piston 23 due to its advancement, the elastic piston 21 bulges and deforms toward the reaction piston 23 side due to the operational reaction force of the output rod 22a. A part of the reaction force is fed back to the brake pedal 52 side via the valve piston 12, so that the driver can sense the output of the output rod 22a, that is, the braking force.
次に、ブレーキペダル５２の踏込み力を解放すると、先
ず弁ピストン１２にかかる前記反力および戻しばね２４
の弾発力により入力杆１１が後退し、これにより第２弁
座１０□を弁部１３ｃに着座させると共にその弁部１３
ｃを弁体保持筒１４の前面に当接させるので、弁部１３
ｃは入力杆１１の後退力を受けて軸方向に圧縮変形を生
じる。Next, when the depression force on the brake pedal 52 is released, the reaction force applied to the valve piston 12 and the return spring 24 are
The input rod 11 retreats due to the elastic force, thereby seating the second valve seat 10□ on the valve portion 13c and
c is brought into contact with the front surface of the valve body holding cylinder 14, so that the valve part 13
c receives the retreating force of the input rod 11 and undergoes compressive deformation in the axial direction.
その結果、第１弁座１０、と弁部１３ｃとの間には当初
の間隙ｇより大きな間隙が形成されるため、その間隙を
通して両作動室Ａ、Ｈの気圧が相互に素早く均衡し、そ
れらの気圧差がな（なれば、ブースタピストン２は、戻
しばね７の弾発力で後退し、ピストンダイヤフラム３の
突起３ｅがブースタシェル１の後壁内面に当接して停止
する。As a result, a gap larger than the initial gap g is formed between the first valve seat 10 and the valve part 13c, so that the air pressures in both the working chambers A and H are quickly balanced with each other through this gap, and If there is no pressure difference, the booster piston 2 will move back due to the elastic force of the return spring 7, and the protrusion 3e of the piston diaphragm 3 will come into contact with the inner surface of the rear wall of the booster shell 1 and stop.
そして、入力杆１１が端壁１ｅに当接したとき、弁部１
３ｃは入力杆１１の後退力から開放されて原形に復元す
るので、第１弁座１０１との間隙を再び小間隙ｇに狭ば
めることができる。Then, when the input rod 11 comes into contact with the end wall 1e, the valve part 1
3c is released from the retreating force of the input rod 11 and returns to its original shape, so that the gap with the first valve seat 101 can be narrowed to the small gap g again.
第１作動室Ａに負圧が蓄えられていない状態でブレーキ
ペダル５２を踏込み、ブースタピストン２を前進させた
場合には、第１作動室Ａの空気が管路抵抗等により吸気
マニホールド側へ十分に排出されないため、第１作動室
Ａの残留空気が圧縮されるが、第１作動室Ａの気圧が第
２作動室Ｂのそれよりも高くなれば、第１作動室Ａの残
留空気の一部はブースタピストン２後面とピストンダイ
ヤフラム受圧部３ｄ前面との間に進入し、薄肉部６３を
後方に押圧するので、ブースタピストン２と薄肉部６３
との間に間隙を生じ、その間隙を介して両作動室Ａ、Ｂ
が連通ずる。If the brake pedal 52 is depressed and the booster piston 2 is moved forward with no negative pressure stored in the first working chamber A, the air in the first working chamber A will flow sufficiently toward the intake manifold due to pipe resistance, etc. Since the residual air in the first working chamber A is compressed, if the pressure in the first working chamber A becomes higher than that in the second working chamber B, part of the residual air in the first working chamber A is compressed. The portion enters between the rear surface of the booster piston 2 and the front surface of the piston diaphragm pressure receiving portion 3d and presses the thin wall portion 63 backward, so that the booster piston 2 and the thin wall portion 63
A gap is created between the two working chambers A and B through that gap.
is connected.
したがって、上記間隙を通して両作動室Ａ、Ｂの気圧が
相互に素早（均衡するので、ピストンダイヤフラム３に
過大な後方押圧力が作用してそれを後方へ膨出変形させ
るような不具合が未然に防止される。Therefore, the air pressures in both working chambers A and B are quickly balanced (balanced) through the above-mentioned gap, so that problems such as excessive rearward pressing force acting on the piston diaphragm 3 and causing it to bulge rearward are prevented. be done.
上記気圧差がなくなれば、薄肉部６３は再びブースタピ
ストン２に密着する。When the above-mentioned pressure difference disappears, the thin wall portion 63 comes into close contact with the booster piston 2 again.
以上のように本発明によれば、前記ブースタピストン２
の後面に環状溝６１を形成すると共にその環状溝の後側
壁６１ａに切欠き６５を設け、前記ピストンダイヤフラ
ム３の内周縁に形成された環状ビード３ｂを前記環状溝
６１に嵌着し、前記環状と一ド３ｂの前記切欠き６５に
臨む部分を、前記ブースタピストン２に離間可能に密着
する薄肉部６３に形成し、その薄肉部６３０周縁に立設
した位置決め突壁６４を前記切欠き６５に係合したので
、負圧源の不作動時や故障等により第１作動室Ａに負圧
が蓄えられていないとき、ブースタピストン２の前進に
より第１作動室Ａ内部が圧縮されでも、前記環状ビード
３ｂの薄肉部６３がブースタピストン２から離間し、両
作動室Ａ、Ｂ間を連通させてそれらの気圧を均衡させる
ことができ、したがってピストンダイヤフラム３に無用
な圧力が作用するのを回避し、その耐久性を向上させる
ことができる。As described above, according to the present invention, the booster piston 2
An annular groove 61 is formed on the rear surface, and a notch 65 is provided in the rear wall 61a of the annular groove, and an annular bead 3b formed on the inner peripheral edge of the piston diaphragm 3 is fitted into the annular groove 61. A portion of the door 3b facing the notch 65 is formed into a thin wall portion 63 that is in close contact with the booster piston 2 in a separable manner, and a positioning projecting wall 64 erected on the periphery of the thin wall portion 630 is formed in the notch 65. Because they are engaged, when negative pressure is not stored in the first working chamber A due to the negative pressure source being inactive or malfunctioning, even if the inside of the first working chamber A is compressed by the advance of the booster piston 2, the annular The thin wall portion 63 of the bead 3b is separated from the booster piston 2, allowing communication between the working chambers A and B to balance their air pressures, thus avoiding unnecessary pressure from acting on the piston diaphragm 3. , its durability can be improved.
また、第１作動室Ａに負圧を蓄えた通常の状態では、ブ
ースタピストン２の作動時、第２作動室Ｂの気圧が第１
作動室Ａのそれよりも高くなるので、その気圧差により
ピストンダイヤフラム３の薄肉部６３をブースタピスト
ン２に強く密着させて両作動室Ａ、Ｂ間の遮断を確実に
することができ、ブースタピストン２の作動に何等支障
を来たすことはない。In addition, in a normal state in which negative pressure is stored in the first working chamber A, when the booster piston 2 is activated, the atmospheric pressure in the second working chamber B is
Since the pressure is higher than that of the working chamber A, the pressure difference makes it possible to bring the thin walled part 63 of the piston diaphragm 3 into close contact with the booster piston 2 to ensure the isolation between the working chambers A and B, and the booster piston There is no problem in the operation of 2.
さらに、前記薄肉部６３は、位置決め突壁６４および切
欠き６５等と協働してブースタピストン２およびピスト
ンダイヤフラム３相互の位置決め機構を構成するので、
一方向空気弁と位置決めの２様の働きに寄与し、構造を
著しく簡素化することができる。Furthermore, the thin wall portion 63 cooperates with the positioning protrusion wall 64, the notch 65, etc., and constitutes a mutual positioning mechanism for the booster piston 2 and the piston diaphragm 3.
It contributes to the two-way function of the one-way air valve and positioning, and can significantly simplify the structure.
図面は本発明装置の一実施例を示すもので、第１図に側
面図、第２図は背面図、第３図は縦断側面図、第４図は
第３図矢示■−■線斜視図、第５図はピストンダイヤフ
ラムの部分斜視図である。
Ｓ・・・負圧式倍力装置、Ａ・・・第１作動室、Ｂ・・
・第２作動室、１・・・ブースタシェル、２・・・ブー
スタピストン、３・・・ピストンダイヤフラム、３ｂ・
・・環状ビード、５・・・制御弁、１１・・・入力杆、
６１・・・環状溝、６３・・・薄肉部、６４・・・突壁
、６５・・・切欠き。The drawings show one embodiment of the device of the present invention, in which Fig. 1 is a side view, Fig. 2 is a rear view, Fig. 3 is a vertical side view, and Fig. 4 is a perspective view taken along the line indicated by the arrows in Fig. 3. FIG. 5 is a partial perspective view of the piston diaphragm. S... Negative pressure booster, A... First working chamber, B...
・Second working chamber, 1... Booster shell, 2... Booster piston, 3... Piston diaphragm, 3b.
... Annular bead, 5... Control valve, 11... Input rod,
61... Annular groove, 63... Thin wall portion, 64... Projection wall, 65... Notch.
Claims (1)
収容したブースタピストン２と、そのブースタピストン
２の後面に内周部を固着すると共に外周部を前記ブース
タシェル１の内周面に固着したピストンダイヤフラム３
とにより負圧源に連なる前部の第１作動室側と、制御弁
５を介して前記第１作動室Ａまたは大気との連通を切換
え制御される後部の第１作動室側とに区画し、前記ブー
スタピストン２に進退自在に連結した入力杆１１の前進
時、それに前記ブースタピストン２を追従作動させるた
めの気圧差が前記両作動室Ａ、Ｂ間に生じるように、前
記入力杆１１を前記制御弁５に連結した負圧式倍力装置
において、前記ブースタピストン２の後面に環状溝６１
を形成すると共にその環状溝の後側壁６１ａに切欠き６
５を設け、前記ピストンダイヤフラム３の内周縁に形成
された環状ビード３ｂを前記環状溝６１に嵌着し、前記
環状ビード３ｂの前記切欠き６５に臨む部分を、前記ブ
ースタピストン２に離間可能に密着する薄肉部６３に形
成し、その薄肉部６３０周縁に立設した位置決め突壁６
４を前記切欠き６５に係合したことを特徴とする、負圧
式倍力装置。1 A booster piston 2 that accommodates the inside of the booster shell 1 so as to be able to reciprocate back and forth, and a piston diaphragm that has an inner circumferential portion fixed to the rear surface of the booster piston 2 and an outer circumferential portion fixed to the inner circumferential surface of the booster shell 1. 3
The chamber is divided into a first working chamber at the front connected to a negative pressure source and a first working chamber at the rear whose communication with the first working chamber A or the atmosphere is switched and controlled via the control valve 5. The input rod 11 is arranged so that when the input rod 11 connected to the booster piston 2 is moved forward and backward, a pressure difference is generated between the working chambers A and B to cause the booster piston 2 to follow the movement. In the negative pressure booster connected to the control valve 5, an annular groove 61 is provided on the rear surface of the booster piston 2.
and a notch 6 in the rear wall 61a of the annular groove.
5, the annular bead 3b formed on the inner peripheral edge of the piston diaphragm 3 is fitted into the annular groove 61, and the part of the annular bead 3b facing the notch 65 can be separated from the booster piston 2. A positioning projecting wall 6 formed on the thin wall portion 63 that comes into close contact with the thin wall portion 630 and standing upright on the periphery of the thin wall portion 630.
4 is engaged with the notch 65.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55133316A JPS593298B2 (en) | 1980-09-25 | 1980-09-25 | Negative pressure booster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55133316A JPS593298B2 (en) | 1980-09-25 | 1980-09-25 | Negative pressure booster |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56053419A Division JPS5758550A (en) | 1981-04-09 | 1981-04-09 | Master cylinder mounting device in automobile |
| JP56053420A Division JPS5758551A (en) | 1981-04-09 | 1981-04-09 | Master cylinder mounting device in automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5758546A JPS5758546A (en) | 1982-04-08 |
| JPS593298B2 true JPS593298B2 (en) | 1984-01-23 |
Family
ID=15101826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55133316A Expired JPS593298B2 (en) | 1980-09-25 | 1980-09-25 | Negative pressure booster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS593298B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS642158Y2 (en) * | 1986-05-02 | 1989-01-18 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58174366U (en) * | 1982-05-19 | 1983-11-21 | 住友電気工業株式会社 | Vacuum booster diaphragm |
| US5186242A (en) * | 1990-03-09 | 1993-02-16 | Calsonic Corporation | Condenser provided with forced cooling means |
-
1980
- 1980-09-25 JP JP55133316A patent/JPS593298B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS642158Y2 (en) * | 1986-05-02 | 1989-01-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5758546A (en) | 1982-04-08 |
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| JPH049251Y2 (en) | ||
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| JPS6231665B2 (en) | ||
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| JPH0418583B2 (en) | ||
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