JPS58128950A - Hydraulic brake servo for car brake - Google Patents

Hydraulic brake servo for car brake

Info

Publication number
JPS58128950A
JPS58128950A JP57010315A JP1031582A JPS58128950A JP S58128950 A JPS58128950 A JP S58128950A JP 57010315 A JP57010315 A JP 57010315A JP 1031582 A JP1031582 A JP 1031582A JP S58128950 A JPS58128950 A JP S58128950A
Authority
JP
Japan
Prior art keywords
valve body
valve
power piston
key member
diaphragm
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
Application number
JP57010315A
Other languages
Japanese (ja)
Inventor
Akira Sato
暁 佐藤
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.)
Jidosha Kiki Co Ltd
Original Assignee
Jidosha Kiki 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 Jidosha Kiki Co Ltd filed Critical Jidosha Kiki Co Ltd
Priority to JP57010315A priority Critical patent/JPS58128950A/en
Publication of JPS58128950A publication Critical patent/JPS58128950A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T13/00Transmitting 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
    • B60T13/10Transmitting 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
    • B60T13/24Transmitting 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
    • B60T13/46Vacuum systems
    • B60T13/52Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/569Vacuum 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)

Abstract

PURPOSE:To prevent occurrence of abnormal sounds by making a diaphragm bearing against the inner surface of a shell to regulate the returning position of a valve plunger interlocked with a power piston to a valve body with a key member in non-operating time. CONSTITUTION:An input shaft 12 and a valve plunger 11 are retreated from the operative condition relative to a valve body 3 by a return spring 23 of the input shaft 12 so that the rear side end face of a key member 20 bears regulatively against the valve body 3 to communicate to a negative pressure chamber 6 and an atmospheric pressure chamber 7. Thus, the valve body 3 and others are retreated near non-working position by a return spring 17. Then, a diaphragm 5 bears against the inner surface of a rear shell 2 to stop a rear power piston 4, the key member 20, the valve plunger 11 interlocked therewith plunger 11 and the input shaft 12. Next, the large diameter portion (a) of the valve body 3 bears against the power piston. Thus, the occurrence of abnormal sounds can be prevented through the diaphragm 5 buffering collision.

Description

【発明の詳細な説明】 本発明はブレーキ倍力装置に関し、より詳しくはその作
動開始時における入力軸の無効ストロークを小さくした
ブレーキ倍力装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake booster, and more particularly to a brake booster that reduces the invalid stroke of an input shaft at the start of operation.

一般にブレーキ倍力装置は、入力軸のrlJ進によりこ
れに連動させjこ弁プランジャを前進させ、まず負圧室
と大気圧室との連通を遮断させるとともに、次に大気圧
室を大気に連通させ、これによって生じる負圧室と大気
圧室間の圧力差でパワーピストンを作動させて倍力作用
を得るようにしている。そしてブレーキ倍力装置の復帰
作動時には、上記弁プランジャの後退により大気圧室と
大気とを遮断させるとともに負圧室と大気圧室とを連通
させ、画室間の圧力差を無くしてリターンスプリングに
より上記パワーピストンを元の非作動位置に復帰させる
ようにしている。
In general, a brake booster advances the valve plunger in conjunction with the rlj advance of the input shaft, first cutting off communication between the negative pressure chamber and the atmospheric pressure chamber, and then communicating the atmospheric pressure chamber with the atmosphere. The resulting pressure difference between the negative pressure chamber and the atmospheric pressure chamber operates the power piston to obtain a boosting effect. When the brake booster returns, the valve plunger is retracted to shut off the atmospheric pressure chamber and the atmosphere, while communicating the negative pressure chamber and the atmospheric pressure chamber, eliminating the pressure difference between the compartments and using the return spring to The power piston is returned to its original non-operating position.

しかるに、上記復帰作動時において、パワーピストンを
速やかに復帰させる!こめには上記i2 [室と大気圧
室間の流路面積を大きくして両室間の圧力差を速やかに
無くさせることが必要であるが、そのために上記弁プラ
ンジャのストロークはを大きくとると、次の作動開始時
にそのストローク置だけ弁プランジャ及び入力軸を前進
させないと負圧至と大気圧室間の遮断が行なえないこと
となり、その結果、入力軸の無効ストロークが増大して
いた。
However, during the above-mentioned return operation, the power piston is returned immediately! In this case, it is necessary to increase the flow path area between the chamber and the atmospheric pressure chamber to quickly eliminate the pressure difference between the two chambers, but in order to do so, the stroke of the valve plunger must be increased. When the next operation starts, the valve plunger and the input shaft must be advanced by that stroke position to shut off the negative pressure chamber and the atmospheric pressure chamber, resulting in an increase in the invalid stroke of the input shaft.

このような欠点を改善するため、従来、弁プランジャが
バルブボディから扱は出るのを防止するキ一部材を利用
して、パワーピストンの復帰作動時には上記流路面積を
大きく確保し、非作動状態ではその流路面積を小さくし
て次の作動開始時の無効ストロークを小さくできるよう
にしたブレーキ倍力装置が提案されている。このブレー
キ倍力装置は、上記キ一部材をバルブボディに対しその
作動方向に摺動可能に設けたもので、パワーピストンの
復帰作動時にはキ一部材をバルブボディに対し後退側と
して上記大きな流路面積を確保し、非作動状態となると
きにはキ一部材をシェルの内面に当接させてこのキ一部
材と弁プランジャの後退を停止させるとともに、この弁
プランジャの停止より若干遅れてバルブボディをそのキ
一部材により、又はパワーピストン背面のダイアフラム
をシェルの内面に当接させることにより停止させ、これ
によりバルブボディに対して相対的に弁プランジャを前
進させた状態で両者を非作動状態とすることにより上記
無効ストロークを小さくするようにしていた。
In order to improve these drawbacks, conventionally, a key member that prevents the valve plunger from coming out of the valve body is used to ensure a large flow path area when the power piston returns, and when the power piston is in the non-operating state. A brake booster has been proposed in which the flow path area is reduced to reduce the invalid stroke at the start of the next operation. This brake booster is provided with the above-mentioned key member slidable relative to the valve body in its operating direction, and when the power piston returns, the key member is set on the backward side relative to the valve body and the large flow path is The area is secured, and when the valve plunger is in a non-operating state, the key member is brought into contact with the inner surface of the shell to stop the retreat of the key member and the valve plunger, and the valve body is moved back slightly after the valve plunger stops. It is stopped by a key member or by bringing the diaphragm on the back of the power piston into contact with the inner surface of the shell, thereby rendering both the valve plunger in an inoperable state while the valve plunger is advanced relative to the valve body. Accordingly, the above-mentioned invalid stroke was made smaller.

しかしながらかかる構成のブレーキ倍力装置では通常金
属で構成されるシェルとキ一部材とが衝突するため異音
が発生し易く、仮りに一方を合成栃脂で構成したりゴム
等の弾性体を設けても衝突箇所が外部に近接したシェル
の内面であることや接触面積をさほど大きくとれないこ
と等から異音の発生を抑えることが必ずしも充分ではな
かった。
However, in a brake booster with such a structure, abnormal noise is likely to occur due to the collision between the shell and the key member, which are usually made of metal. However, it has not always been sufficient to suppress the generation of abnormal noise because the collision point is on the inner surface of the shell close to the outside and the contact area cannot be made very large.

本発明はこのような事情に鑑み、パワーピストンをバル
ブボディに対して摺動自在とし、このパワーピストンと
キ一部材とを連動させて上記と同様な作動を行なえるよ
うにすることにより、シェルとの衝突部分をパワーピス
トン背面のダイアフラムとしたもので、これにより充分
な接触面積を確保して異音の発生を抑制したブレーキ倍
力装置を提供するものである。
In view of these circumstances, the present invention makes the power piston slidable relative to the valve body, and allows the power piston and key member to interlock to perform the same operation as described above. The diaphragm on the back of the power piston is used as the collision part with the brake booster, thereby ensuring a sufficient contact area and suppressing the occurrence of abnormal noise.

以下図示実施例について本発明を説明すると、第1図に
おいて、(1)はフロントシェル、(2)はりヤシエル
、(3)はバルブボディ、(4)はこのバルブボディ(
3)の外周部にその作動方向に沿って摺動自在に取付け
たパワーピストンで、このパワーピストン(4)の半径
方向中間部に環状の溝(4a)を形成してここにダイア
フラム(5)の内周部(5a)を係合するとともに、上
記フロントシェル+1)とりヤシエル(2)とによりダ
イアフラム(5)の外周部(5b)を挟持して、それら
の内部を負圧室(6)と大気圧室(7)とに区画してい
る。このパワーピストン(4)の軸部は筒部(4b)と
して形成してこの部分を上記バルブボディ(3)の外周
部に摺動自在に嵌装し、かつその筒部(4b)の先端折
曲部分をバルブボディ(3)の大径部(3a)端面に当
接させることにより、上記大気圧室(7)に大気圧が導
入されてパワーピストン(4)に圧力差による作用力が
作用した際にはその大径部(3a)端面を介して作用力
をバルブボディ(3)に伝達できるようにしている。
The present invention will be explained below with reference to the illustrated embodiments. In Fig. 1, (1) is a front shell, (2) is a beam shell, (3) is a valve body, and (4) is this valve body (
A power piston (3) is attached to the outer periphery of the power piston (4) so as to be slidable along its operating direction, and an annular groove (4a) is formed in the radially intermediate part of the power piston (4), and a diaphragm (5) is attached thereto. The inner peripheral part (5a) of the diaphragm (5) is engaged with the outer peripheral part (5b) of the diaphragm (5), and the outer peripheral part (5b) of the diaphragm (5) is sandwiched between the front shell +1) and the palm shell (2), and the inside of them is formed into a negative pressure chamber (6). and an atmospheric pressure chamber (7). The shaft portion of the power piston (4) is formed as a cylindrical portion (4b), and this portion is slidably fitted to the outer circumferential portion of the valve body (3), and the tip of the cylindrical portion (4b) is folded. By bringing the curved portion into contact with the end surface of the large diameter portion (3a) of the valve body (3), atmospheric pressure is introduced into the atmospheric pressure chamber (7), and an acting force due to the pressure difference is applied to the power piston (4). When this occurs, the acting force can be transmitted to the valve body (3) via the end face of the large diameter portion (3a).

また筒部(4b)の内周面とバルブボディ(3)の外周
面との間にシール部材(8)を設けて上記負圧室(6)
と大気圧室(7)との間の気密を保っている。
Further, a sealing member (8) is provided between the inner circumferential surface of the cylindrical portion (4b) and the outer circumferential surface of the valve body (3), so that the negative pressure chamber (6)
and the atmospheric pressure chamber (7).

上記バルブボディ(3)の末端筒部(3b)はりヤシエ
ル(2)の開口(2a)からシール部材(9)により気
密を保って外部に突出させてあり、その筒部(3b)内
に弁機構(10)を設けている。この弁機構(10)は
従来周知のものと1叫様に弁プランジャ(11)および
入力軸(12)を備えており、非作動状態時には、フロ
ントシェルf1)の負圧導入管(13)を介して負圧室
(6)内に常時導入されている負圧を、バルブボディ(
3)に形成した軸方向の通路(14)、弁体(15)と
バルブボディ(3)の弁座(3c)との間隙および半径
方向通路(16)を介して大気圧室(7)内に導入させ
、リターンスプリング(17)によりバルブボディ(3
)を非作動位置に保持するようにしている。
The terminal cylindrical part (3b) of the valve body (3) protrudes from the opening (2a) of the palm shell (2) to the outside while keeping airtight with a sealing member (9), and the valve body (3b) has a valve inside. A mechanism (10) is provided. This valve mechanism (10) is equipped with a valve plunger (11) and an input shaft (12) in the same way as the conventional one, and when in the non-operating state, the negative pressure introduction pipe (13) of the front shell f1) is connected to the valve plunger (11) and the input shaft (12). The negative pressure that is constantly introduced into the negative pressure chamber (6) through the valve body (
3), the gap between the valve element (15) and the valve seat (3c) of the valve body (3), and the radial passage (16) into the atmospheric pressure chamber (7). is introduced into the valve body (3) by the return spring (17).
) is held in the inoperative position.

上記弁プランジfff11)がバルブボディ(3)から
抜は出るのを防止するキ一部材(20)は、第2図に示
すように、バルブボディ(3)内に挿通されて弁プラン
ジャ(11)の中間小径部に係合する係合部(208)
と、バルブボディ(3)の外周に沿い、かつパワーピス
トン(4)の筒部(4b)内に収納される円弧状の連結
部(20b)とを備えている。そしてパワーピストン(
4)の筒部(4b)には、第1図、第3図に示すように
、その一部を切断して内側に折曲げた保持片(4C)を
設け、バルブボディ(3)にキ一部材(20)を組込ん
だ状態でバルブボディ(3)をパワーピストン(4)の
筒部(4b)内に挿入させ、上記キ一部材(20)を保
持片(4C)上を越えさせてその保持片(4C)を自己
の弾性で起こさせることにより、保持片(4C)と筒部
(4b)の末端壁部(4d)との間でキ一部材で20)
を固定している。このキ一部材(20)はパワーピスト
ン(4)と一体に上記バルブボディ(3)に対して摺動
可能となっており、また弁プランシイ(11)はキー素
材(20)に対して摺動自在となっている。なお、第1
図中、(21)はリアクションディスク、(22)はブ
ツシュロッド、(23)は入力軸(12)の復帰はねで
ある。
As shown in FIG. 2, the key member (20) that prevents the valve plunger fff11) from being removed from the valve body (3) is inserted into the valve body (3) and the valve plunger (11) is inserted into the valve body (3). an engaging portion (208) that engages with the intermediate small diameter portion of the
and an arcuate connecting portion (20b) that extends along the outer periphery of the valve body (3) and is accommodated within the cylindrical portion (4b) of the power piston (4). and power piston (
As shown in FIGS. 1 and 3, the cylindrical portion (4b) of 4) is provided with a holding piece (4C) that is partially cut and bent inward, and a key is attached to the valve body (3). With the one member (20) assembled, insert the valve body (3) into the cylindrical part (4b) of the power piston (4), and move the key member (20) over the holding piece (4C). By raising the holding piece (4C) with its own elasticity, a key member (20) is inserted between the holding piece (4C) and the end wall part (4d) of the cylinder part (4b).
is fixed. This key member (20) can be slid against the valve body (3) together with the power piston (4), and the valve plansy (11) can be slid against the key material (20). It is free. In addition, the first
In the figure, (21) is a reaction disk, (22) is a bushing rod, and (23) is a return spring for the input shaft (12).

以上の構成において、第1図に示す非作動状態では、後
に詳述するように、既に入力軸(12)および弁プラン
ジャ(11)はバルブボディ(3)に対して所要量前進
した位置となっており、弁体(15)と弁座(3C)と
の間隙は微少量となっている。この状態から入力軸(1
2)を介して弁プランジャ(11)が史に前進されると
上記弁体(15)が弁座(3C)に着座して負王室(6
)と大気圧室(7〉との連通を遮断し、ひき続く弁プラ
ンジャ(11)の前進により弁プランジャ(11)の末
端が弁体(15)より離隔して大気圧室(7)に大気圧
を導入する。
In the above configuration, in the non-operating state shown in FIG. 1, the input shaft (12) and the valve plunger (11) are already in a position where they are advanced by the required amount with respect to the valve body (3), as will be explained in detail later. The gap between the valve body (15) and the valve seat (3C) is very small. From this state, the input shaft (1
2), the valve plunger (11) is moved forward, the valve body (15) is seated on the valve seat (3C), and the valve plunger (11) is moved forward through the valve seat (3C).
) and the atmospheric pressure chamber (7>), and as the valve plunger (11) continues to move forward, the end of the valve plunger (11) separates from the valve body (15), causing a large amount of air to flow into the atmospheric pressure chamber (7). Introduce atmospheric pressure.

これにより従来と同様にしてブレーキ作用が行なわれた
後、入力軸(12)の前進力が解放されると、第4図に
示すように入力軸(12)の復帰はね(23)によって
入力軸(12)および弁プランジャ(11)がバルブボ
ディ(3)に対して後退され、弁プランジャ(11)の
後退によりキ一部#(20)およびパワーピストン(4
)もバルブボディ(3)に対して後退する。
As a result, when the forward force of the input shaft (12) is released after the braking action is performed in the same manner as in the conventional case, the input shaft (12) is returned by the return spring (23) as shown in FIG. The shaft (12) and the valve plunger (11) are retracted with respect to the valve body (3), and the retraction of the valve plunger (11) causes the key part # (20) and the power piston (4) to be retracted.
) also retreats with respect to the valve body (3).

それら部材の後退は、キ一部材(20)の後退側端面が
バルブボディ(3)に当接することによって規制され、
この状態では弁体(15)は弁座(3C)から大きく離
隔して、負圧室(6)と大気圧室(7)とを大きな流路
面積をもって連通させる。
The retreat of these members is regulated by the retreat side end surface of the key member (20) coming into contact with the valve body (3),
In this state, the valve body (15) is largely separated from the valve seat (3C), allowing the negative pressure chamber (6) and the atmospheric pressure chamber (7) to communicate with each other with a large flow area.

第4図に示す状態を維持しつつバルブボディ(3)等が
リターンスプリング(17)によって非作動位置近傍ま
で後退されてくると、第1図に示すように、ダイアフラ
ム(5)がリヤシェル(2)の内面に当接するためリヤ
パワーピストン(4)およびこれと一体のキ一部材(2
0)が停止し、これと同時にキ一部材(20)に係合し
ている弁プランジャ(11)およびこれに連結された入
力軸(12)の後退も停止する。これに対し、バルブボ
ディ(3)はリターンスプリング(17)によりひき続
き後退されており、そのバルブボディ(3)の大径部(
3a)とパワーピストン(4)とが当接すると、バルブ
ボディ(3)の後退が停止される。この状態では、弁プ
ランジャ(11)はバルブボディ(3)に対し所要量だ
け前進されたこととなり、前述のように弁体(15)と
弁座(3C)との間隙を小さくする。
When the valve body (3) etc. are moved back to the vicinity of the non-operating position by the return spring (17) while maintaining the state shown in FIG. ), the rear power piston (4) and the key member (2
0) stops, and at the same time, the valve plunger (11) engaged with the key member (20) and the input shaft (12) connected thereto also stop retracting. On the other hand, the valve body (3) continues to be retracted by the return spring (17), and the large diameter portion (
3a) and the power piston (4) come into contact, the retreat of the valve body (3) is stopped. In this state, the valve plunger (11) has been advanced by the required amount with respect to the valve body (3), thereby reducing the gap between the valve body (15) and the valve seat (3C) as described above.

この非作動状態への復帰時、ダイアフラム(5)がリヤ
シェル(2)の内面に衝突し、またバルブボディ(3)
とパワーピストン(4)とが衝突するが、前者の衝突で
はダイアフラム(5)が弾性体であり、しかも大きな接
触面積を確保できることから、後者の衝突ではバルブボ
ディ(3)が合成樹脂製であり、しかもシェルCI)、
f2)の内部で衝突が行なわれることから、異音の発生
する可能性を少くすることができる。
When returning to this non-operating state, the diaphragm (5) collides with the inner surface of the rear shell (2) and the valve body (3)
The valve body (3) collides with the power piston (4), but in the former collision the diaphragm (5) is an elastic body and can secure a large contact area, while in the latter collision the valve body (3) is made of synthetic resin. , and shell CI),
Since the collision occurs inside f2), the possibility of abnormal noise occurring can be reduced.

第5図、第6図は本発明の他の実施例を示したもので、
上述の実施例を基礎として、バルブボディ(3)の大径
部(3a)とパワーピストン(4)との間によはね(2
4ンを追加したものである。このような構成とすれば、
入力軸(12)の復帰はね(23)を格別に強化する必
要がなくなり、従来一般の弁機構(10)関係のアッセ
ンブリーをそのまま組込むことができる。
5 and 6 show other embodiments of the present invention,
Based on the above embodiment, a spring (2) is provided between the large diameter part (3a) of the valve body (3) and the power piston (4).
This is an addition of 4. With this kind of configuration,
There is no need to particularly strengthen the return spring (23) of the input shaft (12), and a conventional valve mechanism (10)-related assembly can be incorporated as is.

第7図は、上述の実施例とは異なる形状のキ一部材(2
5)を用いた実施例を示したもので、このキ一部材(2
5)はバルブボディ(3′)を貫通しており、そのため
にバルブボディ(3′)に形成した上記実施例の通路(
14)に相当する通路(14’)は、キ一部材(25)
の両側位置にそれぞれ設けている。またパワーピストン
(4′)には、図示しないが、上記保持片(4C)に相
当する保持片をキ一部材(25)の両端部を保持できる
ように2箇所に設けている。
FIG. 7 shows a key member (2
This shows an example using the key member (2).
5) passes through the valve body (3'), and for this purpose the passage (3') of the above embodiment is formed in the valve body (3').
The passage (14') corresponding to 14) is a key member (25).
They are provided on both sides of the . Although not shown, the power piston (4') is provided with two holding pieces corresponding to the holding pieces (4C) at two locations so as to hold both ends of the key member (25).

史に本発明の他の実施例として、弁プランジャ(11)
とキ一部材(20)、(25)とを一体に連結し、かつ
、キ一部材(20)、(25)とパワーピストン(4)
、(4′)とをその作動方向に相対膠動可能に連結する
ようにしてもよい。この場合にはキ一部材とパワーピス
トンとが衝突することになるが、その衝突はブレーキ倍
力装置の制動状態から制動解放状態に切換わる際に行な
われるので、シェル(1)、(2)の内部中央部で衝突
することとなり、やはり異音の発生を低減することがで
きる。
As another embodiment of the present invention, a valve plunger (11)
and the key members (20), (25) are integrally connected, and the key members (20), (25) and the power piston (4) are connected together.
, (4') may be connected so as to be movable relative to each other in the operating direction. In this case, the key member and the power piston will collide, but this collision occurs when the brake booster switches from the braking state to the brake releasing state, so shells (1) and (2) Since the collision occurs at the center of the interior of the vehicle, the occurrence of abnormal noise can be reduced.

以上のように、本発明においては、非作動時には上記ダ
イアプラムをシェルの内面に当接させてパワーピストン
およびキ一部材を介してこれに連動する弁プランジャの
バルブボディに対する戻り位置を規制するようにしてい
るので、キ一部材を直接シェル内面に当接させる従来装
置に比して異音の発生をより効果的に抑えることができ
るようになる。
As described above, in the present invention, when the diaphragm is not in operation, the diaphragm is brought into contact with the inner surface of the shell to restrict the return position of the valve plunger, which is interlocked with the power piston and the key member, relative to the valve body. Therefore, the generation of abnormal noise can be suppressed more effectively than in the conventional device in which the key member is brought into direct contact with the inner surface of the shell.

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

第1図は本発明の一実施例を示す断面図、第2図は第1
図の■−■線に沿う断面図、第3図は第1図に示すパワ
ーピストン(4)の面部(4b)部分の下面図、第4図
は第1図と異なる状態を示す要部の断面図、第5図は本
発明の他の実施例を示す断面図、第6図は第5図と異な
る状態を示す要部の断面図、第7図は本発明の側に他の
実施例における第2図と同様な部分での断面図である。 (1)・・フロントシェル  (2)・・リヤシェル(
3)、(3′)・・バルブボディ(5)・・ダイアフラ
ム(4)、(4′)・・パワーピストン (lO)・・
弁機構(11)・・弁プランジャ     (12)・
・入力軸(20)、(25)・・キ一部材 一つ 第2図 第3図 −267− 第6図
FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
3 is a bottom view of the surface portion (4b) of the power piston (4) shown in FIG. 1, and FIG. 4 is a sectional view taken along line ■-■ in the figure. 5 is a sectional view showing another embodiment of the present invention, FIG. 6 is a sectional view of a main part showing a state different from that in FIG. 5, and FIG. 7 is a sectional view showing another embodiment of the present invention. FIG. 2 is a cross-sectional view of a portion similar to that in FIG. 2; (1)...Front shell (2)...Rear shell (
3), (3')...Valve body (5)...Diaphragm (4), (4')...Power piston (lO)...
Valve mechanism (11)...Valve plunger (12)...
・Input shaft (20), (25)...One key part Fig. 2 Fig. 3-267- Fig. 6

Claims (1)

【特許請求の範囲】[Claims] 圧力流体の流路の切換制御を行なう弁機構を収納したバ
ルブボディと、このバルブボディにこれの作動方向に沿
って摺動可能に設けたパワーピストンと、このパワーピ
ストンの背面に配設したダイアフラムと、上記バルブボ
ディにこれの作動方向に沿って摺動可能に配設して上記
弁機構を構成する弁プランジャに係合させたキ一部材と
を備え、上記弁プランジャとパワーピストンとをキ一部
材を介して連動゛させ、非作動時には上記ダイアフラム
をシェルの内面に当接させてパワーピストンおよびキ一
部材を介してこれに連動する弁プランジャのバルブボデ
ィに対する戻り位置を規制することを特徴とするブレー
キ倍力装置。
A valve body that houses a valve mechanism that controls switching of the flow path of pressure fluid, a power piston that is installed in this valve body so that it can slide along the direction of operation, and a diaphragm that is installed on the back of this power piston. and a key member that is slidably disposed on the valve body along the operating direction of the valve body and engaged with the valve plunger constituting the valve mechanism, and the key member is configured to lock the valve plunger and the power piston. When the diaphragm is not in operation, the diaphragm is brought into contact with the inner surface of the shell to regulate the return position of the valve plunger relative to the valve body, which is interlocked with the power piston through a key member. Brake booster.
JP57010315A 1982-01-26 1982-01-26 Hydraulic brake servo for car brake Pending JPS58128950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57010315A JPS58128950A (en) 1982-01-26 1982-01-26 Hydraulic brake servo for car brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57010315A JPS58128950A (en) 1982-01-26 1982-01-26 Hydraulic brake servo for car brake

Publications (1)

Publication Number Publication Date
JPS58128950A true JPS58128950A (en) 1983-08-01

Family

ID=11746804

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57010315A Pending JPS58128950A (en) 1982-01-26 1982-01-26 Hydraulic brake servo for car brake

Country Status (1)

Country Link
JP (1) JPS58128950A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0567568U (en) * 1992-02-24 1993-09-07 日信工業株式会社 Negative pressure booster
EP1346894A1 (en) * 2002-03-21 2003-09-24 ROBERT BOSCH GmbH Pneumatic brake servo with improved seals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0567568U (en) * 1992-02-24 1993-09-07 日信工業株式会社 Negative pressure booster
EP1346894A1 (en) * 2002-03-21 2003-09-24 ROBERT BOSCH GmbH Pneumatic brake servo with improved seals
FR2837452A1 (en) * 2002-03-21 2003-09-26 Bosch Gmbh Robert PNEUMATIC BRAKE ASSIST SERVO MOTOR WITH IMPROVED SEALING MEANS

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