JPS628344B2 - - Google Patents

Info

Publication number
JPS628344B2
JPS628344B2 JP56154156A JP15415681A JPS628344B2 JP S628344 B2 JPS628344 B2 JP S628344B2 JP 56154156 A JP56154156 A JP 56154156A JP 15415681 A JP15415681 A JP 15415681A JP S628344 B2 JPS628344 B2 JP S628344B2
Authority
JP
Japan
Prior art keywords
booster
working chamber
piston
booster piston
valve
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
Application number
JP56154156A
Other languages
Japanese (ja)
Other versions
JPS5856959A (en
Inventor
Nobuaki Hachiro
Yoshihisa Myazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissin Kogyo Co Ltd
Original Assignee
Nissin Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nissin Kogyo Co Ltd filed Critical Nissin Kogyo Co Ltd
Priority to JP56154156A priority Critical patent/JPS5856959A/en
Publication of JPS5856959A publication Critical patent/JPS5856959A/en
Publication of JPS628344B2 publication Critical patent/JPS628344B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/569—Vacuum systems indirect, i.e. vacuum booster units characterised by piston details, e.g. construction, mounting of diaphragm

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Description

【発明の詳細な説明】 本発明は、主として自動車の油圧式ブレーキ、
クラツチ等のマスタシリンダを負圧力を以て倍力
作動する負圧式倍力装置、特にブースタシエルの
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
周ビードを結着すると共に外周ビードを前記ブー
スタシエルの周壁に結着した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、入力部材
に連動する制御弁を介して前記第１作動室または
大気に選択的に連通される後部の第２作動室とに
区画した形式のものに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to hydraulic brakes for automobiles,
A negative pressure booster that boosts a master cylinder such as a clutch using negative pressure, in particular a booster piston that accommodates the inside of a booster shell so that it can freely reciprocate back and forth, and an inner peripheral bead that is tied to the rear surface of the booster piston. At the same time, the outer peripheral bead is connected to a negative pressure source by a diaphragm connected to the peripheral wall of the booster shell, and is connected to the first working chamber or the atmosphere via a control valve linked to an input member. It is of a type that is partitioned into a second working chamber at the rear which is communicated with the main working chamber.

上記負圧式倍力装置において、負圧源の不作動
時、したがつて第１作動室に負圧が蓄えられてい
ない状態で、マスタシリンダを作動させるべくブ
ースタピストンをマニユアル作動させると、第１
作動室内の空気が前進するブースタピストンによ
り圧縮され、その空気の負圧源への排出抵抗によ
りブースタピストンの前進が多少とも妨げられる
ため、そのマニユアル作動に軽快さを欠くことが
ある。 In the above negative pressure booster, when the negative pressure source is not activated, and therefore no negative pressure is stored in the first working chamber, when the booster piston is manually operated to operate the master cylinder, the first
The air in the working chamber is compressed by the advancing booster piston, and the resistance to discharge of the air to the negative pressure source impedes the forward movement of the booster piston, so that manual operation may lack smoothness.

本発明は、前記形式の倍力装置において、第１
作動室に負圧が蓄えられていない場合に、ブース
タピストンをマニユアル作動するとき、ブースタ
ピストンに形成される透孔およびダイヤフラムに
設けられる薄肉部を利用して第１作動室で圧縮さ
れる空気を第２作動室に排出し、ブースタピスト
ンのマニユアル作動を軽快に行い得るようにし、
また第１作動室に負圧が蓄えられている通常状態
では前記ブースタピストンの通気孔をダイヤフラ
ムの薄肉部により確実に閉塞して第１作動室から
第２作動室への無用な負圧の漏洩を防止し得る、
簡単有効な構成を備えた、前記装置を提供するこ
とを目的とする。 The present invention provides a booster of the type described above, in which a first
When the booster piston is operated manually when negative pressure is not stored in the working chamber, the air compressed in the first working chamber is pumped using the through hole formed in the booster piston and the thin walled part provided in the diaphragm. It is discharged into the second working chamber so that manual operation of the booster piston can be performed easily.
In addition, under normal conditions where negative pressure is stored in the first working chamber, the vent hole of the booster piston is reliably closed by the thin walled portion of the diaphragm, preventing unnecessary negative pressure from leaking from the first working chamber to the second working chamber. can prevent
It is an object of the present invention to provide the above-mentioned device having a simple and effective configuration.

以下、図面により本発明の実施例について説明
すると、第１図においてＷは自動車のエンジンル
ームの後側壁を構成する支持壁で、その前面に、
ブレーキ用マスタシリンダＭを前端に結合した本
発明の負圧式倍力装置Ｓが取付けられる。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG.
A negative pressure booster S of the present invention, which has a brake master cylinder M coupled to its front end, is attached.

倍力装置Ｓのブースタシエル１は軽量な薄肉鋼
板または合成樹脂より形成された前後一対の前、
後部シエル１Ｆ，１Ｒよりなり、その後部シエル
１Ｒの開口部に円周上等間隔に突設された複数の
爪片１ａを前部シエル１Ｆ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
シエル１Ｆ，１Ｒ相互の位置決めが行われ、そし
て両シエル１Ｆ，１Ｒはそれらの前後対向壁間を
２本のタイロツド３０を介して連結される。この
ブースタシエル１とタイロツド３０との連結構造
については後述する。 The booster shell 1 of the booster S has a pair of front and rear parts made of lightweight thin steel plate or synthetic resin.
Consisting of rear shells 1F and 1R, a plurality of claw pieces 1a protruding from the opening of the rear shell 1R at equal intervals on the circumference are formed at the opening of the front shell 1F at equal intervals on the circumference. The two shells 1F, 1R are positioned by engaging with the notch 1b of the two shells 1F, 1R, and the two shells 1F, 1R are connected via two tie rods 30 between their front and rear opposing walls. The connection structure between the booster shell 1 and the tie rod 30 will be described later.

ブースタシエル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.

ダイヤフラム３の外周部と内周部には外周ビー
ド３ａおよび内周ビード３ｂがそれぞれ形成され
ており、その外周ビード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
（図には一方のみ示す）をそれぞれ後部シエル１
Ｒの外周部に形成された各位置決め孔１ｃに嵌め
て両シエル１Ｆ，１Ｒにより挾着される。内周ビ
ード３ｂはブースタピストン２の環状溝６１に嵌
着され、このダイヤフラム３とブースタピストン
２とにより、ブースタシエル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。 An outer bead 3a and an inner bead 3b are formed on the outer and inner circumferences of the diaphragm 3, respectively, and the outer bead 3a has two positioning projections protruding from its end surface at equal intervals on the circumference. 3c
(Only one is shown in the figure) for each rear shell 1
It is fitted into each positioning hole 1c formed on the outer periphery of R and is clamped by both shells 1F and 1R. The inner peripheral bead 3b is fitted into the annular groove 61 of the booster piston 2, and the diaphragm 3 and the booster piston 2 allow the inside of the booster shell 1 to be divided into a first working chamber A at the front and a second working chamber at the rear. It is divided into B.

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の外周面と前部シエル１Ｆの内周面との間に
おいて第１作動室Ａ側に突出するようＵ字形に折
曲げられ、このＵ字形折曲げ部の転動によりブー
スタピストン２の前進、後退を許容する。 The pressure receiving portion 3d of the diaphragm 3 is U-shaped so as to be in close contact with the rear surface of the booster piston 2 and protrude toward the first working chamber A between the outer circumferential surface of the booster piston 2 and the inner circumferential surface of the front shell 1F. The U-shaped bent portion allows the booster piston 2 to move forward and backward by rolling.

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が設けられ、ダイヤフラム
３の内周ビード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てある。さら
に、上記薄肉部６３の周縁からはチヤンネル状の
位置決め突壁６４を一体に起立させ、この突壁６
４を前記切欠き６５に係合する。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。ブースタピストン２には、ダイ
ヤフラム３の薄肉部６３に対向する通気孔６６が
形成される。 A notch 65 is provided in the rear wall 61a of the annular groove 61 of the booster piston 2, and a portion of the inner peripheral bead 3b of the diaphragm 3 facing the notch 65 is formed into a thin wall portion 63, which is connected to the booster piston 2. It is attached tightly to the rear surface of the holder so that it can be separated freely. Furthermore, a channel-shaped positioning projecting wall 64 is integrally erected from the periphery of the thin portion 63, and this projecting wall 6
4 into the notch 65. This engagement restricts relative rotation between the booster piston 2 and the diaphragm 3. A vent hole 66 is formed in the booster piston 2 so as to face the thin wall portion 63 of 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またはブースタシエル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つてい
る。 The first working chamber A is always in communication with the intake manifold (not shown) of the internal combustion engine, which is a negative pressure source, through a negative pressure introduction pipe 4, and the second working chamber B is connected to a control valve 5, which will be described later.
The air inlet port 6 is alternately connected to the first working chamber A or to the air inlet 6 which opens in the end wall 1e of the rear extension tube 1d of the booster shell 1 through the opening.

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２作動
室Ｂ側に弾発され、その後退限はダイヤフラム３
の背面に***形成した突起３ｅがブースタシエル
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 second working chamber B, by a return spring 7 contracted in the first working chamber A, and its backward limit is set by the diaphragm 3.
A protrusion 3e formed on the rear surface of the booster shell 1 is regulated by coming into contact with the inner surface of the rear wall of the booster 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
つて開放する。 The booster piston 2 is integrally formed with a valve cylinder 8 projecting in the axial direction from the rear surface of its central portion, and is slidably supported on a flat bearing 9 provided in the extension cylinder 1d, and its rear end is connected to the atmosphere. It opens toward the introduction port 6.

弁筒８内には、制御弁５を次のように構成す
る。即ち、弁筒８の前部内壁に環状の第１弁座１
０１を形成し、弁筒８の前部には、入力部材とし
ての入力杆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１０１に囲繞される環状の第
２弁座１０２を形成する。 The control valve 5 is configured in the valve cylinder 8 as follows. That is, an annular first valve seat 1 is provided on the front inner wall of the valve cylinder 8.
0 1 , and a valve piston 12 connected to an input rod 11 as an input member and forming a front end thereof is slidably connected to the front part of the valve cylinder 8.
An annular second valve seat 102 surrounded by the first valve seat 101 is formed at the rear end.

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を介して挾止する。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１
３ａ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。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。 A base end 13a of a cylindrical valve element 13 with both ends open is clamped to the inner wall of the valve cylinder 8 via a valve element holding cylinder 14 fitted into the valve cylinder 8. This valve body 13 is made of an elastic material such as rubber, and its base end 1
A thin-walled diaphragm 13b extends radially inward from 3a, and a thick-walled valve portion 13c is connected to the inner peripheral end of the thin-walled diaphragm 13b . Facing 2 . 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１０１，１０２に向つて
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 the annular reinforcing plate 15 to bias the valve portion 13c toward both valve seats 10 1 and 10 2 .

第１弁座１０１の外側部はブースタピストン２
の通孔１７を介して第１作動室Ａに、また第１お
よび第２弁座１０１，１０２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
２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 is the booster piston 2
The intermediate portions of the first and second valve seats 10 1 and 10 2 are connected to the second working chamber B through another through hole 18, and the second valve seat 10
The inner part of 2 is connected to the atmosphere inlet 6 through the inside of the valve body 13.
are in constant communication with each other.

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ピストン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２
０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。出力ピストン２２は前方に突出
する出力杆２２ａを一体に有する。 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 surface of the large diameter hole 19.
An elastic piston 21 made of rubber or the like and an output piston 22 of the same diameter are sequentially inserted into the small diameter hole 20, and a reaction piston 23 with a smaller diameter than the elastic piston 21 is slid into the small diameter hole 20.
0, the small shaft 12a protruding from the front end surface of the valve piston 12 is inserted to face the rear end surface of the reaction piston 23. 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ツパ板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。而して可動ストツパ板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。そ
の調節後の可動ストツパ板２５の固定は、同じく
入力杆１１に螺合したロツクナツト２６の緊締に
より行われる。可動ストツパ板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。 The input rod 11 is always urged in the backward direction by the return spring 24, and its retraction limit is determined by the movable stopper plate 25 screwed onto the input rod 11 when the rear extension tube 1d
It is regulated by contacting the inner side of the end wall 1e. If the movable stopper plate 25 is rotated, the screwing position between it and the input rod 11 changes, so that the retraction limit of the input rod 11 can be adjusted back and forth. 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. A ventilation hole 27 is bored in the movable stopper plate 25 so as not to 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イルタ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 atmospheric air inlet 6 and to be deformable so as not to interfere with the operation of the input rod 11.

次に、タイロツド３０とブースタシエル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.

タイロツド３０には、ブースタシエル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、またブースタシエル１前壁の内面に
当接するばね受板３４を固着する。そしてブース
タシエル１前面に重ねたブレーキマスタシリンダ
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
によりタイロツド３０、ばね受板３４、ブースタ
シエル１前壁および取付フランジ３６の四者を一
体に連結する。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、ブースタシエル１前壁のタイロツド貫通孔を
封緘する環状シール部材３８を嵌装する。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７の弾発力をタイロツド３０に
負担させてブースタシエル１への負担を取除くこ
とができる。 A mounting bolt 33 that penetrates the front wall of the booster shell 1 and projects forward thereof is integrally formed on the tie rod 30, and a spring receiving plate 34 that comes into contact with the inner surface of the front wall of the booster shell 1 is fixed. Then, the mounting bolt 33 is passed through the mounting flange 36 of the brake master 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 the mounting flange 36 are connected together. At that time, an annular groove 37 formed on the front surface of the spring receiving plate 34 so as to surround the bolt 33
An annular seal member 38 is fitted to seal the tie rod through hole in the front wall of the booster shell 1. The spring support plate 34 supports the fixed end of the return spring 7, and allows the tie rod 30 to bear the elastic force of the return spring 7, thereby removing the load on the booster shell 1.

さらに、タイロツド３０には、ブースタシエル
１後壁を貫通してその後方に突出する取付ボルト
３９と、ブースタシエル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
エル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ツド
３０とブースタシエル１後壁とを一体に連結す
る。その際、段付フランジ４１の小径部と支筒４
３間の環状溝４４に、ブースタシエル１後壁のタ
イロツド貫通孔を封緘する環状シール部材４５を
嵌装する。 Furthermore, the tie rod 30 is integrally formed with a mounting bolt 39 that penetrates through 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. At that time, the small diameter part of the stepped flange 41 and the support tube 4
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 booster shells 1 and 3.

上記取付ボルト３９は、これを自動車の支持壁
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ツド３０を支持壁Ｗに固着す
る。 The mounting bolt 39 passes through the support wall W of the automobile, and the tie rod 30 is fixed to the support wall W by screwing and tightening a nut 40 at its tip.

かくしてブースタシエル１はタイロツド３０を
介して支持壁Ｗに取付けられ、またブレーキマス
タシリンダＭはタイロツド３０を介してブースタ
シエル１に連結される。 Thus, the booster shell 1 is attached to the support wall W via the tie rod 30, and the brake master cylinder M is connected to the booster shell 1 via the tie rod 30.

タイロツド３０は、四角形の一方の対角頂点に
２本配設され、また他の対角頂点において支持壁
Ｗへの２本の取付専用ボルトがブースタシエル１
の後壁に溶接して配設されるが、それらについて
は図面には省略した。 Two tie rods 30 are arranged at one diagonal vertex of the rectangle, and two bolts exclusively for mounting to the support wall W are attached to the booster shell 1 at the other diagonal vertex.
It is welded to the rear wall of the building, but these are omitted from the drawing.

タイロツド３０が貫通するブースタピストン２
の透孔３１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
タイロツド３０との間にシール手段を施す。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でタイロツド３０を囲
繞し、その前端４６ａをタイロツド３０の外周面
に形成された環状溝４７に、またその後端４６ｂ
を透孔３１にそれぞれ嵌着する。 Booster piston 2 penetrated by tie rod 30
A sealing means is provided between the booster piston 2 and the tie rod 30 in order to seal the through hole 31 so as not to interfere with the operation of the piston 2. The sealing means is composed of a bellows-shaped telescopic 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. In the formed annular groove 47, also at the rear end 46b
are fitted into the through holes 31, respectively.

車室において倍力装置Ｓの入力杆１１の後端に
は、固定ブラケツト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。
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。 A brake pedal 52, which is pivotally supported 51 on a fixed bracket 50, is connected to the rear end of the input rod 11 of the booster S in the passenger compartment via a connecting fitting 53.
54 is a return spring that biases the brake pedal 52 rearward.

ブレーキマスタシリンダＭのシリンダ本体５５
後端部はブースタシエル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５
５内の作動ピストン５６の後端に倍力装置Ｓの出
力杆２２ａを対向させる。 Cylinder body 55 of brake master cylinder M
The rear end penetrates the front wall of the booster shell 1 and enters the first working chamber A, and the cylinder body 5
The output rod 22a of the booster S is opposed to the rear end of the operating piston 56 in 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、可動ストツパ板２５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１３ｃ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、それによつて第１
弁座１０１と弁部１３ｃ間に僅かな間隙ｇを形成
している。このような状態は前記した可動ストツ
パ板２５の調節により容易に得ることができる。 Next, to explain the operation of this embodiment, the illustrated state shows the non-operating state of the booster.
The valve piston 12, the input rod 11, and the brake pedal 52, which are connected to each other, are returned to a predetermined retracted position where the movable stopper plate 25 abuts the fixed end wall 1e, and are held by the spring force of the spring 24, and the valve piston 12 is held by the spring force of the spring 24. The front face of the valve part 13c is pressed through the second valve seat 102 , and is moved back until it lightly contacts the front face of the valve body holding cylinder 14.
A slight gap g is formed between the valve seat 101 and the valve portion 13c. 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。したがつ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。 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 , 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. Therefore, the booster piston 2 also returns to the spring 7.
occupies the illustrated retracted position with a resilient force of .

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１３ｃとの間隙ｇが前
述のように極めて狭いので、弁部１３ｃ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１０２は弁部１３
ｃ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。し
たがつて第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，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、
ブレーキマスタシリンダ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。この場
合、両作動室Ａ，Ｂ間に生じる気圧差により、内
周ビード３ｂの薄肉部６３はブースタピストン２
に強く密着して通気孔６６を閉塞しているので、
両作動室Ａ，Ｂ間は確実に遮断される。 Now, if the brake pedal 52 is depressed to brake the vehicle and the input rod 11 and the valve piston 12 are moved forward, the valve portion 13c, which is urged forward by the valve spring 16, will move forward following the valve piston 12. Since the gap g between the first valve seat 101 and the valve part 13c is extremely narrow as described above, the valve part 13c immediately seats on the first valve seat 101 to establish communication between the working chambers A and B. At the same time, the second valve seat 102 is closed to the valve part 13.
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, apart from the second working chamber B. Therefore, the atmosphere is quickly introduced into the second working chamber B, and the pressure in this chamber B becomes higher than that in the first working chamber A, and the pressure difference between the two chambers A and B causes the booster piston 2 to resist the return spring 7. Since the output rod 22a is moved forward via the elastic piston 21,
The actuating piston 56 of the brake master cylinder M is driven forward, and the vehicle is braked. In this case, due to the pressure difference generated between the working chambers A and B, the thin wall portion 63 of the inner peripheral bead 3b
Because it tightly adheres to and blocks the ventilation hole 66,
The two 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
の荷重はタイロツド３０を介して車体、即ち支持
壁Ｗに伝達して支承される。したがつてブースタ
シエル１には上記荷重は作用しない。 When the operating piston 56 is driven, a forward thrust load is applied to the cylinder body 55, and this load is transmitted to the vehicle body, that is, the support wall W, through the tie rod 30 and supported. Therefore, the above-mentioned 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２
１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側にフイードバツクさ
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, due to its advancement, the small shaft 12a of the valve piston 12 passes through the reaction piston 23 to the elastic piston 2.
1, a part of the reaction force is fed back to the brake pedal 52 side via the valve piston 12 due to the bulging deformation of the elastic piston 21 toward the reaction piston 23 side due to the actuation reaction force of the output rod 22a. This allows the driver to 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１０２を弁部１３ｃに着
座させると共にその弁部１３ｃを弁体保持筒１４
の前面に当接させるので、弁部１３ｃは入力杆１
１の後退力を受けて軸方向に圧縮変形を生じる。
その結果、第１弁座１０１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，Ｂの気圧が相
互に素早く均衡し、それらの気圧差がなくなれ
ば、ブースタピストン２は、戻しばね７の弾発力
で後退し、ダイヤフラム３の突起３ｅがブースタ
シエル１の後壁内面に当接して停止する。そし
て、入力杆１１が端壁１ｅに当接したとき、弁部
１３ｃは入力杆１１の後退力から解放されて原形
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。 Next, when the depressing force of the brake pedal 52 is released, the input rod 11 is moved backward due to the reaction force applied to the valve piston 12 and the elastic force of the return spring 24, which causes the second valve seat 102 to move toward the valve portion 13c. and seat the valve portion 13c in the valve body holding cylinder 14.
The valve part 13c is brought into contact with the front surface of the input rod 1.
Compressive deformation occurs in the axial direction due to the retreating force of 1.
As a result, a gap larger than the initial gap g is formed between the first valve seat 101 and the valve part 13c, so that the air pressures in both working chambers A and B are quickly balanced with each other through this gap. When the pressure difference disappears, the booster piston 2 moves backward by the elastic force of the return spring 7, and the protrusion 3e of the diaphragm 3 comes into contact with the inner surface of the rear wall of the booster shell 1 and stops. Then, when the input rod 11 comes into contact with the end wall 1e, the valve part 13c 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 is reduced to the small gap g again. It can be narrowed down.

第１作動室Ａに負圧に蓄えられていない状態で
ブースタピストン２をマニユアル作動する場合ブ
レーキペダル５２を踏込み、ブースタピストン２
を前進させると、制御弁５により第２作動室Ｂは
第１作動室Ａとの連通を断たれて大気と連通され
るので、第１作動室Ａの空気は圧縮されて負圧導
入管４から負圧源側に排出されようとするが、そ
の排出抵抗により第１作動室Ａの空気が圧縮さ
れ、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の空気の一部はブ
ースタピストン２後面をダイヤフラム受圧部３ｄ
前面との間に進入すると同時に通気孔６６を通り
薄肉部６３を後方に押圧する。これによりブース
タピストン２と薄肉部６３との間に間隙を生じ、
その間隙を介して第１作動室Ａの空気は大気圧下
の第２作動室Ｂに容易に排出されるため、第１作
動室Ａの空気の排出抵抗が殆んどなく、ブースタ
ピストン２を軽快にマニユアル作動させることが
できる。 When manually operating the booster piston 2 when negative pressure is not stored in the first working chamber A, depress the brake pedal 52 and press the booster piston 2.
, the second working chamber B is disconnected from the first working chamber A and communicated with the atmosphere by the control valve 5, so that the air in the first working chamber A is compressed and the negative pressure introduction pipe 4 However, if the air in the first working chamber A is compressed by the discharge resistance and the air pressure in the first working chamber A becomes higher than that in the second working chamber B, then the air in the first working chamber A becomes higher than that in the second working chamber B. 1 A part of the air in the working chamber A passes through the rear surface of the booster piston 2 to the diaphragm pressure receiving part 3d.
At the same time as it enters between the front surface and the front surface, it passes through the ventilation hole 66 and presses the thin part 63 backward. This creates a gap between the booster piston 2 and the thin wall portion 63,
Since the air in the first working chamber A is easily discharged through the gap into the second working chamber B under atmospheric pressure, there is almost no resistance to discharging the air in the first working chamber A, and the booster piston 2 is It can be easily operated manually.

ブースタピストン２の後退時には、第１作動室
Ａの気圧が第２作動室Ｂのそれよりも低くなるた
めダイヤフラム受圧部３ｄがブースタピストン２
後面に密着し、その受圧部３ｄとブースタピスト
ン２後面との間に存在する空気は通気孔６６を通
じて直ちに第１作動室Ａ側に排出される。したが
つて、第１作動室Ａに負圧が蓄えられている状態
で制動操作を行う場合に、ブースタピストン２後
面とダイヤフラム受圧部３ｄとの間に閉込められ
ている空気に緩衝作用により生じるブースタピス
トン２の作動ロスを回避することができる。 When the booster piston 2 retreats, the pressure in the first working chamber A becomes lower than that in the second working chamber B, so the diaphragm pressure receiving part 3d
Air that is in close contact with the rear surface and exists between the pressure receiving portion 3d and the rear surface of the booster piston 2 is immediately discharged to the first working chamber A side through the ventilation hole 66. Therefore, when a braking operation is performed with negative pressure stored in the first working chamber A, the pressure is generated due to the buffering effect of the air trapped between the rear surface of the booster piston 2 and the diaphragm pressure receiving part 3d. Operation loss of the booster piston 2 can be avoided.

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６１の後側壁６１ａに切欠き６５を設
け、前記ダイヤフラム３の内周縁に形成された内
周ビード３ｂを前記環状溝６１に嵌着し、前記内
周ビード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の後面に離間可能に密着す
る薄肉部６３に形成し、その薄肉部６３の周縁に
立設した位置決め突壁６４を前記切欠き６５に係
合し、前記ブースタピストン２に、前記薄肉部６
３と対向する通気孔６６を設けたので、第１作動
室Ａに負圧が蓄えられていない状態でのブースタ
ピストン２のマニユアル作動時にはブースタピス
トン２の前進に伴い増大する第１作動室Ａ内の空
気圧をブースタピストン２後面とダイヤフラム３
の間および通気孔６６を通じてダイヤフラム３の
薄肉部６３に作用させ、その薄肉部６３をブース
タピストン２から離間させて、上記空気圧を第２
作動室Ｂに排出することができ、したがつて、上
記マニユアル作動を軽快に行うことができる上、
ダイヤフラム３に無理な空気圧が加わることが回
避されるからその耐久性を向上させることができ
る。またブースタピストン２後退時には、それと
ダイヤフラム３間の空気を通気孔６６を通じて第
１作動室Ａに排出し得るので、両者２，３間に空
気が溜まることがなく、通常の制動操作に不都合
を生じることがない。 As described above, according to the present invention, an annular groove 61 is formed on the rear surface of the booster piston 2, a notch 65 is provided on the rear side wall 61a of the annular groove 61, and a notch 65 is provided on the inner peripheral edge of the diaphragm 3. The peripheral bead 3b is fitted into the annular groove 61, and the portion of the inner peripheral bead 3b facing the notch 65 is formed into a thin wall portion 63 that closely contacts the rear surface of the booster piston 2 in a separable manner. A positioning projecting wall 64 erected on the periphery of the booster piston 2 is engaged with the notch 65 , and the thin wall portion 6 is attached to the booster piston 2 .
Since the ventilation hole 66 is provided opposite to the first working chamber A, when the booster piston 2 is operated manually without negative pressure stored in the first working chamber A, the inside of the first working chamber A increases as the booster piston 2 moves forward. Air pressure is applied to the rear surface of booster piston 2 and diaphragm 3.
The air pressure is applied to the thin wall portion 63 of the diaphragm 3 through the gap and the ventilation hole 66, and the thin wall portion 63 is separated from the booster piston 2 to apply the air pressure to the second
It can be discharged into the working chamber B, so the manual operation described above can be performed easily, and
Since excessive air pressure is prevented from being applied to the diaphragm 3, its durability can be improved. Furthermore, when the booster piston 2 is retracted, the air between it and the diaphragm 3 can be discharged into the first working chamber A through the vent hole 66, so air will not accumulate between the two and 3, which would cause problems in normal braking operations. Never.

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の空気圧は第１作動室Ａのそれよりも高くな
り、その気圧差でダイヤフラム３の薄肉部がブー
スタピストン２に強く密着して通気孔６６を確実
に閉塞するので、第１作動室Ａから第２作動室Ｂ
への無用な負圧の漏洩を確実に防止することがで
きる。 In addition, in a normal state where negative pressure is stored in the first working chamber A, when the booster piston 2 is activated, the air pressure in the second working chamber B becomes higher than that in the first working chamber A, and this pressure difference causes the diaphragm to 3 tightly adheres to the booster piston 2 and reliably closes the ventilation hole 66, allowing air to flow from the first working chamber A to the second working chamber B.
It is possible to reliably prevent leakage of unnecessary negative pressure to.

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二様の働
きに寄与し、構造を著しく簡素化することができ
る。 Further, the thin wall portion 63 has a positioning protruding wall 64.
Since the booster piston 2 and the diaphragm 3 cooperate with each other and the notch 65 to form a positioning mechanism for the booster piston 2 and the diaphragm 3, it contributes to two functions of the one-way air valve and positioning, and the structure can be significantly simplified.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明装置の一実施例を示すもので、第
１図は縦断面図、第２図は第１図矢示―線斜
視図、第３図は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……ブースタシエル、２……
ブースタピストン、３……ダイヤフラム、３ａ…
…外周ビード、３ｂ……内周ビード、５……制御
弁、１１……入力部材としての入力杆、６１……
環状溝、６３……薄肉部、６４……突壁、６５…
…切欠き、６６……通気孔。 The drawings show one embodiment of the device of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a perspective view taken along the line indicated by the arrow in FIG. 1, and FIG. 3 is a partial perspective view of a diaphragm. S... Negative pressure booster, A... First working chamber, B
...Second working chamber, 1...Booster shell, 2...
Booster piston, 3...Diaphragm, 3a...
...outer bead, 3b...inner bead, 5...control valve, 11...input rod as input member, 61...
Annular groove, 63... Thin wall portion, 64... Projection wall, 65...
...notch, 66...ventilation hole.

Claims (1)

【特許請求の範囲】[Claims] １ ブースタシエル１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２と、そのブー
スタピストン２の後面に内周ビード３ｂを結着す
ると共に外周ビード３ａを前記ブースタシエル１
の周壁に結着したダイヤフラム３とにより負圧源
に連なる前部の第１作動室Ａと、入力部材１１に
連動する制御弁５を介して前記第１作動室Ａまた
は大気に選択的に連通される後部の第２作動室Ｂ
とに区画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６１の後側壁６１ａに切欠き６５
を設け、前記ダイヤフラム３の前記内周ビード３
ｂを前記環状溝６１に嵌着し、前記内周ビード３
ｂの前記切欠き６５に臨む部分を、前記ブースタ
ピストン２の後面に離間可能に密着する薄肉部６
３に形成し、その薄肉部６３の周縁に立設した位
置決め突壁６４を前記切欠き６５に係合し、前記
ブースタピストン２に、前記薄肉部６３と対向す
る通気孔６６を設けたことを特徴とする、負圧式
倍力装置。1 A booster piston 2 is housed inside the booster shell 1 so as to be able to reciprocate back and forth, and an inner bead 3b is bonded to the rear surface of the booster piston 2, and an outer bead 3a is attached to the booster shell 1.
A diaphragm 3 connected to the peripheral wall of the front first working chamber A connects to a negative pressure source, and selectively communicates with the first working chamber A or the atmosphere via a control valve 5 interlocked with an input member 11. Second working chamber B at the rear
In the negative pressure booster divided into two sections, an annular groove 61 is formed on the rear surface of the booster piston 2, and a notch 65 is formed on the rear side wall 61a of the annular groove 61.
and the inner peripheral bead 3 of the diaphragm 3
b into the annular groove 61, and the inner peripheral bead 3
A thin wall portion 6 whose portion facing the notch 65 of b is in close contact with the rear surface of the booster piston 2 in a separable manner.
3, a positioning projecting wall 64 standing upright on the peripheral edge of the thin wall portion 63 is engaged with the notch 65, and a ventilation hole 66 facing the thin wall portion 63 is provided in the booster piston 2. Features a negative pressure booster.
JP56154156A 1981-09-29 1981-09-29 Booster of negative pressure type Granted JPS5856959A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56154156A JPS5856959A (en) 1981-09-29 1981-09-29 Booster of negative pressure type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56154156A JPS5856959A (en) 1981-09-29 1981-09-29 Booster of negative pressure type

Publications (2)

Publication Number Publication Date
JPS5856959A JPS5856959A (en) 1983-04-04
JPS628344B2 true JPS628344B2 (en) 1987-02-21

Family

ID=15578059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56154156A Granted JPS5856959A (en) 1981-09-29 1981-09-29 Booster of negative pressure type

Country Status (1)

Country Link
JP (1) JPS5856959A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51124543A (en) * 1975-04-23 1976-10-30 Mitsubishi Rayon Co Acrylic resin covering material for farming
JPS5473712A (en) * 1977-11-07 1979-06-13 Ciba Geigy Ag Fluorinated cation compound*its manufacture and surfactant thereof
JPS5484524A (en) * 1977-12-07 1979-07-05 Ciba Geigy Ag Perfluorinated alkyl substituted semiiester and amide and surfactant therefrom
JPS54103808A (en) * 1978-02-02 1979-08-15 Ciba Geigy Ag Perfluoroalkyl thioethyl ether derivative
JPS5591663A (en) * 1978-12-30 1980-07-11 Kasei Co C I Coating material for agriculture and method of using said material
JPS5655432A (en) * 1979-10-11 1981-05-16 Mitsubishi Monsanto Chem Co Surface-modifying composition and synthetic resin film coated therewith
JPS5714648A (en) * 1980-06-28 1982-01-25 C I Kasei Co Ltd Covering material for agriculture and its use

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51124543A (en) * 1975-04-23 1976-10-30 Mitsubishi Rayon Co Acrylic resin covering material for farming
JPS5473712A (en) * 1977-11-07 1979-06-13 Ciba Geigy Ag Fluorinated cation compound*its manufacture and surfactant thereof
JPS5484524A (en) * 1977-12-07 1979-07-05 Ciba Geigy Ag Perfluorinated alkyl substituted semiiester and amide and surfactant therefrom
JPS54103808A (en) * 1978-02-02 1979-08-15 Ciba Geigy Ag Perfluoroalkyl thioethyl ether derivative
JPS5591663A (en) * 1978-12-30 1980-07-11 Kasei Co C I Coating material for agriculture and method of using said material
JPS5655432A (en) * 1979-10-11 1981-05-16 Mitsubishi Monsanto Chem Co Surface-modifying composition and synthetic resin film coated therewith
JPS5714648A (en) * 1980-06-28 1982-01-25 C I Kasei Co Ltd Covering material for agriculture and its use

Also Published As

Publication number Publication date
JPS5856959A (en) 1983-04-04

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