JPH02231260A - Master cylinder equipped with assisting device - Google Patents

Master cylinder equipped with assisting device

Info

Publication number
JPH02231260A
JPH02231260A JP5077289A JP5077289A JPH02231260A JP H02231260 A JPH02231260 A JP H02231260A JP 5077289 A JP5077289 A JP 5077289A JP 5077289 A JP5077289 A JP 5077289A JP H02231260 A JPH02231260 A JP H02231260A
Authority
JP
Japan
Prior art keywords
master cylinder
pump
reservoir
chamber
liquid level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5077289A
Other languages
Japanese (ja)
Other versions
JP2724611B2 (en
Inventor
Ichiro Ishiwatari
一郎 石渡
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.)
Nabco Ltd
Original Assignee
Nabco 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 Nabco Ltd filed Critical Nabco Ltd
Priority to JP1050772A priority Critical patent/JP2724611B2/en
Publication of JPH02231260A publication Critical patent/JPH02231260A/en
Application granted granted Critical
Publication of JP2724611B2 publication Critical patent/JP2724611B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To properly execute the alarm on a master cylinder side and stop of operation of a pump by installing a liquid level detector having two lead switches operated at different liquid level in correspondence with the shift of a float having a magnet, onto a reservoir of the title master cylinder. CONSTITUTION:A master cylinder 10 which is equipped with a master cylinder part 30 and an assisting device 50 which is installed so as to be continuous to the master cylinder part 30 in a cylinder body 12 is further equipped with a reservoir 80 which can supply the working liquid into the master cylinder part 30 and a pump 70. As for the reservoir 80, the inside of the body 81 is divided into chambers 83a-83c by the partitioning walls 82. In this case, a leveller 100 which consists of a cylindrical guide 101, float 120 having a magnet externally fitted with the guide 101 in vertically movable manners, and lead switches 110A and 110B arranged inside the guide 101 is arranged in a chamber 83 communicating to the pump 70. Therefore, the alarm on the master cylinder 10 side and the stop of operation of the pump 70 can be executed properly.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、マスタシリンダのリザーバを,助勢装置の
ポンプ用として井用した助勢装置付きマスタシリンダに
関し,特に.2系統型のマスタシリンダの一方のブレー
キ回路に故障を生じたような場合でも、助勢装置による
有効な作動が得られるようにした技術に関する. (従来の技術およびその問題点) 従来,リザーバの内部を隔壁で区分し、区分した一方を
マスタシリンダに、他方を助勢装置のポンプに各々連絡
すること自体は良く知られている.たとえば,特開昭6
3−291760号の公報が、その一つを示している.
勿論、内部の隔壁は、マスタシリンダのための最低必要
液量を確保するために、所定の高さをもっている.そし
て,リザーバの内部の作動液の液面レベルを検知するた
め、レベラーが設けられるが,コストダウンのため、そ
のレベラーは各室に設けられることなく,一つが共通し
て用いられる. レベラーは、安全性および誤差等を考慮して、隔壁の高
さよりも少し上の液面位置で警報を発する.このレベラ
ーによる警報信号は,作動液の減少を運転手に知らせ,
と同時に、助勢装置のポンプの作動を停止する信号とし
ても用いられる.しかし、実際上,マスタシリンダのた
めに必要とされる液面レベルAと、ポンプのために必要
とされる液面レベルBとは少し異なる.後者Bの方が前
者Aよりも低い位置にある.そこで、レベラーによる警
報信号と同時にポンプの作動を停止させると、液に余裕
があるにもかかわらず,ボンブを無駄に停止させること
になり,ブレーキ回路の一方に故障を生じた時など、助
勢装置によるサーボを充分に働かすことができない. この発明は,レベラーが一つであるにもかかわらず、マ
スタシリンダ側の警報およびポンプの作動の停止を各々
適正に行なうことができるようにした技術を提供するこ
とを目的とする.(発明の概要) この発明では、実施例に対応する添付図面に示すように
、レベラー(すなわち,液面検知装置)100として,
2つのリードスイッチ110A,110Bをもつものを
用いる. 各リードスイッチIIOA,IIOBは、磁石付きフロ
ート120の移動に応じて異なる液面レベルで作動する
.一方のリードスイッチ110Aは、マスタシリンダ部
30に必要とされる液面レベルAで作動し、また、もう
一方のリードスイッチ110Bは、それよりも少し低い
、ポンプ70のために必要とされる液面レベルBで作動
する.したがって、マスタシリンダ側の警報が発せられ
た後、さらに液面レベルAから液面レベルBに至る間、
助勢装置50のボンプ70は引き続いて作動することに
なる.このポンプ70の作動が,ブレーキ回路の一方が
故障したときなどに、助勢装3150による有効なサー
ボを保証する.(実施例) 添付した図面は,助勢装置付きの2系統型マスタシリン
ダの全体的な構造を示している.助勢装置付きの2系統
型マスタシリンダ10は、取付け用のフランジ12aを
備えたシリンダ本体12を有する.シリンダ本体12は
、図の左側の一端12bが閉じ,右側の他端12cが開
口している.以下、図の左側を前方、右側を後方とする
.シリンダ本体12には、開口の部分に中径孔14a,
その奥に小径孔14bが軸線をーにして設けられている
.中径孔14aには、ふた部材16がはまり合い,その
ふた部材16は、中心を貫く入力部材18を案内し支持
している.入力部材18は,後端に続く連結部材20を
通してブレーキペダル22の踏力を受ける.そして、こ
うした入力部材18の周,りを,防塵用のブーツ24が
被う.シリンダ本体12の内部を見ると,小径孔14b
の大部分を占めて、マスタシリンダ部30があり,それ
に隣り合って,中径孔14 aに至る側に助勢装置50
がある. マスタシリンダ部30には,小径孔14bの左側の奥に
第2ピストン32があり、その右側に、コップ状の部材
33およびボルト34を間にして第1ピストン31があ
る.第1ピストン31および第2ピストン32は,各々
,その外周にカップシールあるいはシールリング35a
,35b;36a,36bを保持している.それによっ
て、小径孔14bの一番奥に第2液圧発生室38,また
、両ピストン31.32間に第1液圧発生室37を区画
し、さらに、各ピストン31.32の側周に低圧室39
.40を区画している.第2液圧発生室38は、出口4
2を通して図示しない前輪のブレーキ装置に連絡し,ま
た,第1液圧発生室37は、図示しない別の出口を通し
て後輪のブレーキ装置に連絡している.これらの第1お
よび第2の各液圧発生室37.38は、ブレーキ作動の
ない通常の状態では、リリーフポート44あるいは開弁
じたバルブ45を通してリザーバ80の内部に連絡して
いる.ちなみに、第1および第2の各ピストン31.3
2は、リターンスプリング491,492によって、後
方に向かう付勢力を受け、ブレーキを作動しない時には
、図に示す状態にある.しかし、ブレーキを作動すると
、カツプシール3 5 aがリリーフポート44を閉じ
,あるいはバルブ45が閉弁し、第1および第2の各液
圧発生室37.38に液圧を発生する.また、各低圧室
39.40も,各々、戻し通846.47を通してリザ
ーバ80の内部に連絡している.以上のようなマスタシ
リンダ部30に助勢力を与えるのが、助勢装置50であ
る.助勢装置50の部分を見ると、まず、第1ピストン
31の後部に,軸線に沿って段付き孔51が形成されて
いる.そして、段付き孔51の中に、細長い筒状の弁体
52と、それよりも径の大きい段付き形状のスリーブ6
0とが配置されている.弁体52は、中途のフランジ部
52aにばね53からの力を受け、後方に付勢されてい
る.そのため、フランジ部52aの後方に続、く斜面部
52bが、スリーブ60の開口端部に当たっている.そ
の部分が供給弁■1を構成する.供給弁v1は,ブレー
キの作動がない通常時に閉じている. ばね53が収容された室54は入口弁室であり、弁体5
2の前部をシールするシールリング55aと,スリーブ
60の前部をシールするシールリング55bとによって
区画されている.この人口弁室54は,第1ピストン3
1に設けた通孔56を通して第1ピストン31の側周の
入口室57に常に連通している.ポンプ70の吐出圧を
供給される入口73は,この入口室57に開口している
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a master cylinder with an auxiliary device in which the reservoir of the master cylinder is used as a pump for the auxiliary device. This invention relates to a technology that enables effective operation by an assisting device even in the event of a failure in one brake circuit of a two-system master cylinder. (Prior art and its problems) Conventionally, it is well known that the inside of a reservoir is divided by partition walls, and one of the partitions is connected to a master cylinder and the other to a pump of an assisting device. For example,
Publication No. 3-291760 shows one of them.
Of course, the internal bulkhead has a predetermined height to ensure the minimum required fluid volume for the master cylinder. A leveler is installed to detect the level of the hydraulic fluid inside the reservoir, but in order to reduce costs, one leveler is used commonly instead of being installed in each chamber. The leveler issues an alarm when the liquid level is slightly above the height of the bulkhead, taking into consideration safety and errors. The warning signal from this leveler notifies the driver of the decrease in hydraulic fluid.
At the same time, it is also used as a signal to stop the operation of the assist device's pump. However, in reality, the liquid level A required for the master cylinder and the liquid level B required for the pump are slightly different. The latter B is at a lower position than the former A. Therefore, if the pump operation is stopped at the same time as the warning signal from the leveler, the pump will be stopped needlessly even though there is sufficient liquid, and if one side of the brake circuit fails, etc., the assist device Due to this, the servo cannot work properly. The object of the present invention is to provide a technique that allows the master cylinder side alarm and pump operation to be appropriately stopped even though there is only one leveler. (Summary of the Invention) In the present invention, as shown in the attached drawings corresponding to the embodiments, as a leveler (i.e., liquid level detection device) 100,
A switch with two reed switches 110A and 110B is used. Each reed switch IIOA, IIOB operates at different liquid level according to the movement of the magnetic float 120. One reed switch 110A operates at the liquid level A required for the master cylinder section 30, and the other reed switch 110B operates at the liquid level A required for the pump 70, which is slightly lower. It operates at surface level B. Therefore, after the alarm on the master cylinder side is issued, during the period from the liquid level A to the liquid level B,
The pump 70 of the assist device 50 will continue to operate. This operation of the pump 70 ensures effective servoing by the auxiliary device 3150, such as when one of the brake circuits fails. (Example) The attached drawing shows the overall structure of a two-system master cylinder with an assist device. A two-system master cylinder 10 with an assisting device has a cylinder body 12 provided with a flange 12a for attachment. The cylinder body 12 has one end 12b on the left side in the figure closed and the other end 12c on the right side open. Hereinafter, the left side of the diagram will be referred to as the front, and the right side will be referred to as the rear. The cylinder body 12 has a medium diameter hole 14a in the opening part.
A small-diameter hole 14b is provided at the back thereof with the axis oriented at -. A lid member 16 fits into the medium diameter hole 14a, and the lid member 16 guides and supports an input member 18 passing through the center. The input member 18 receives the depression force of a brake pedal 22 through a connecting member 20 following the rear end. Then, a dustproof boot 24 covers the circumference of the input member 18. Looking inside the cylinder body 12, the small diameter hole 14b
There is a master cylinder part 30 occupying most of the area, and an assisting device 50 adjacent to the master cylinder part 30 is located on the side leading to the medium diameter hole 14a.
There is. In the master cylinder section 30, there is a second piston 32 deep on the left side of the small diameter hole 14b, and on the right side of the second piston 32 there is a first piston 31 with a cup-shaped member 33 and a bolt 34 in between. The first piston 31 and the second piston 32 each have a cup seal or a seal ring 35a on their outer peripheries.
, 35b; 36a, 36b are retained. As a result, a second hydraulic pressure generating chamber 38 is defined at the innermost part of the small diameter hole 14b, and a first hydraulic pressure generating chamber 37 is defined between both the pistons 31, 32, Low pressure chamber 39
.. It is divided into 40 areas. The second hydraulic pressure generation chamber 38 has an outlet 4
The first hydraulic pressure generating chamber 37 is connected to the brake system of the front wheels (not shown) through 2, and the first hydraulic pressure generating chamber 37 is connected to the brake system of the rear wheels through another outlet (not shown). These first and second hydraulic pressure generating chambers 37, 38 communicate with the inside of the reservoir 80 through the relief port 44 or the open valve 45 in a normal state without brake operation. Incidentally, each of the first and second pistons 31.3
2 receives a rearward biasing force by return springs 491 and 492, and is in the state shown in the figure when the brake is not activated. However, when the brake is applied, the cup seal 35a closes the relief port 44 or the valve 45 closes, generating hydraulic pressure in each of the first and second hydraulic pressure generating chambers 37,38. Each low pressure chamber 39.40 also communicates with the interior of the reservoir 80 through a return passage 846.47. The assisting device 50 provides an assisting force to the master cylinder section 30 as described above. Looking at the assisting device 50, first, a stepped hole 51 is formed at the rear of the first piston 31 along the axis. In the stepped hole 51, an elongated cylindrical valve body 52 and a stepped sleeve 6 with a larger diameter than the valve body 52 are inserted.
0 is placed. The valve body 52 receives a force from a spring 53 at an intermediate flange portion 52a, and is biased rearward. Therefore, the slope portion 52b that continues behind the flange portion 52a is in contact with the open end of the sleeve 60. That part constitutes the supply valve ■1. Supply valve v1 is normally closed when the brake is not activated. The chamber 54 in which the spring 53 is accommodated is an inlet valve chamber, and the valve body 5
2 and a seal ring 55b that seals the front of the sleeve 60. This artificial valve chamber 54 is connected to the first piston 3
It is always in communication with an inlet chamber 57 on the side circumference of the first piston 31 through a through hole 56 provided in the first piston 31. An inlet 73 to which the discharge pressure of the pump 70 is supplied opens into this inlet chamber 57 .

したがって,ポンプ70側から供給される圧液は、供給
弁v1が開くと、入口室57から入口弁室54,そして
、供給弁v1から斜めの通路63、中継室64を通して
サーボ室65に供給される.なお、ふた部材16の周り
をシールするシールリング66が、サーボ室65の一角
を区切り、また、スリーブ60の中に配置したゴム部材
67は、ペダル22から入力部材18側に加わる力を緩
衝し、かつ,その弾性復元力によって入力部材18を確
実に後方に戻す. また、スリーブ60は、その後端がストツパリング62
によって位置規制されている.このスリーブ60の中に
は、前部から弁体52が、後部から入力部材18が、各
々、入り込んでいる.入力部材18の前端に凹部18a
が形成され、そこに弁体52の後端が臨み,′rM者に
よって排出弁■2が構成される.排出弁v2は、サーボ
室65側と低圧室39側との連通、遮断を制御する弁で
ある.ブレーキの作動があると、排出弁v2が閉,供給
弁v1が開となり,助勢装置50は,マスタシリンダ部
30に助勢力を与える.その助勢力は、ポンプ70側か
ら供給される圧液に基づく.ポンプ70の周りには.U
動源である電気モータ74のほか、吐出圧を安定させる
ためのアキュムレータ75、また,逆止弁76が配置さ
れている.さて、ポンブ70は,マスタシリンダ部30
と同じくリザーバ80から作動液の供給を受ける.リザ
ーバ80の主体は、内部に作動液を貯える空所を形成し
た合成樹脂製のリザーバ本体81である.リザーバ本体
80の内部は,隔壁82によって3室83a,・83b
,83cに区分されている.隔壁82の一定の高さ以上
の部分にスリット84が設けられているので、その高さ
を越える作動液は各室83a,83b,83c間互いに
連通ずる。
Therefore, when the supply valve v1 opens, the pressure liquid supplied from the pump 70 side is supplied from the inlet chamber 57 to the inlet valve chamber 54, and from the supply valve v1 to the servo chamber 65 through the diagonal passage 63 and the relay chamber 64. Ru. A seal ring 66 sealing around the lid member 16 separates one corner of the servo chamber 65, and a rubber member 67 placed inside the sleeve 60 buffers the force applied from the pedal 22 to the input member 18 side. , and the input member 18 is reliably returned to the rear by its elastic restoring force. Further, the sleeve 60 has a stopper ring 62 at its rear end.
The location is regulated by The valve body 52 is inserted into the sleeve 60 from the front, and the input member 18 is inserted from the rear. A recess 18a is provided at the front end of the input member 18.
is formed, the rear end of the valve body 52 faces there, and the discharge valve 2 is constructed by the operator. The discharge valve v2 is a valve that controls communication and isolation between the servo chamber 65 side and the low pressure chamber 39 side. When the brake is activated, the discharge valve v2 is closed and the supply valve v1 is opened, and the assisting device 50 applies an assisting force to the master cylinder section 30. The assisting force is based on the pressure fluid supplied from the pump 70 side. Around the pump 70. U
In addition to the electric motor 74 that is the driving source, an accumulator 75 and a check valve 76 are provided to stabilize the discharge pressure. Now, the pump 70 is connected to the master cylinder section 30.
Similarly, the hydraulic fluid is supplied from the reservoir 80. The main body of the reservoir 80 is a synthetic resin reservoir body 81 having a cavity therein for storing hydraulic fluid. The inside of the reservoir body 80 is divided into three chambers 83a, 83b by the partition wall 82.
, 83c. Since the slit 84 is provided in a portion of the partition wall 82 that is above a certain height, the hydraulic fluid that exceeds that height communicates with each other between the chambers 83a, 83b, and 83c.

3つに区分された室のうち,室8 3 aがマスタシリ
ンダ部30の第2液圧室38に、また.室83bが第1
液圧室37に各々連絡し、そして、残りの室83cが助
勢装置50のポンプ70に連絡する.各部分への液供給
のため,リザー?{本体81の底部に、各々,管形状の
接続部85a,85b,85cが設けられている.また
,リザーバ本体81の上部には,作動液補給用の開口8
6、およびレベラー(液面検知装置)100挿入用の開
口87が各々設けられている. ここで,リザーバ80は,車両への取付けの関係上、シ
リンダ本体12の軸線に対して斜めになっているが,シ
リンダ本体12から一番遠い方が、ポンブ70に通じる
室8 3 c.となっている.この室83cはレベラー
100の入る室であり、他の2室83a,83bよりも
少し底が深くなっている.レベラー100は、筒状のガ
イド101と、このガイド101の外周にはまり合い、
ガイド101に案内されつつ上下動自由な磁石付きフロ
ート120と,ガイド101の内部に配置されたリード
スイッチとを含んでいる.通常、リードスイッチは一個
設けられるだけであるが、このレベラー100は,2個
のリードスイッチ110A,110Bを備えている.両
リードスイッチは互いに異なる高さ位置にある.一方の
リードスイッチ110Aは,スリット84の下限よりも
少し上の液面レベルAで作動し,また、他方のリードス
イッチ110Bは、スリット84の下限よりも少し下の
液面レベルBで作動するように各々設定されている. 各リードスイッチIIOA,IIOBは、フロート12
0側の磁石121の影響を受けてスイッチング作動する
ことは勿論である.レベラー100は,液面レベルAで
一方のリードスイッチ110Aを作動し、ヌスタシリン
ダ部30の液量不足を警報するが、他方のリードスイッ
チ110Bについては、それよりも低い液面レベルBに
ならなければスイッチング作動を行なわない.したがっ
て、マスタシリンダ部30の一方の系統に故障を生じた
ような場合,マスタシリンダ部30の警報が発せられた
後,しばらくの間、ポンプ70は引き続いて作動し続け
ることになる.それによって、助勢装M50による有効
なサーボが保証されるわけである.なお,各リードスイ
ッチIIOA,110Bからは、リード線112a,1
12bがガイド101の上端まで延び、そこに設けた端
子部114から外部回路に接続されている.なお,レベ
ラー100を入れる室83cは、底をより深くするのが
好ましいので、図に示した実施例のように、室83Cを
シリンダ本体12から一番離れた所に配置するのが良い
が、それに限定されることはない,たとえば、レベラー
100を入れる室なリザーバの中央に配置し,そこから
ポンプ70に対して液を供給するようにすることもでき
る. また,この発明に関連する技術として、リードスイッチ
自体は一つのままにし,ポンプ70の制御回路の方で液
面レベルAから液面レベルBのちがいに相当するだけの
時間的な遅れを生じさせるようにする方法、あるいは、
リザーバ80の外部にポンプ70に対する最低液量を保
証する別の補助的なリザーバを設ける方法、なども考え
られる.しかし,前者では,設定時間が不明であり,し
かも外部に余分な回路が必要であるし、また、後者では
、補助的なリザーバの取付けおよびそのスペースが必要
となる.その点,図示した実施例を含めて、この発明は
、そうした難点をすべて解消しうる. (発明の効果) この発明によれば、一つのレベラー100によって各々
適正な警報信号を得るようにしているため、一方のブレ
ーキ回路の故障時などでも有効なサーボを働かせること
ができる.
Among the three chambers, chamber 83a is connected to the second hydraulic pressure chamber 38 of the master cylinder section 30, and the chamber 83a is connected to the second hydraulic pressure chamber 38 of the master cylinder section 30. Chamber 83b is the first
The remaining chambers 83c are connected to the hydraulic pressure chambers 37, and the remaining chambers 83c are connected to the pump 70 of the assisting device 50. Reservoir for supplying liquid to each part? {Tubular connecting portions 85a, 85b, and 85c are provided at the bottom of the main body 81, respectively. Additionally, an opening 8 for replenishing the hydraulic fluid is provided at the top of the reservoir body 81.
6, and an opening 87 for inserting a leveler (liquid level detection device) 100. Here, the reservoir 80 is oblique to the axis of the cylinder body 12 due to its attachment to the vehicle, but the one farthest from the cylinder body 12 is the chamber 8 3 c. It becomes. This chamber 83c is a chamber into which the leveler 100 is placed, and has a slightly deeper bottom than the other two chambers 83a and 83b. The leveler 100 fits into a cylindrical guide 101 and the outer periphery of this guide 101,
It includes a magnetic float 120 that can move up and down freely while being guided by a guide 101, and a reed switch disposed inside the guide 101. Normally, only one reed switch is provided, but this leveler 100 is equipped with two reed switches 110A and 110B. Both reed switches are at different heights. One reed switch 110A operates at a liquid level A slightly above the lower limit of the slit 84, and the other reed switch 110B operates at a liquid level B slightly below the lower limit of the slit 84. are set respectively. Each reed switch IIOA, IIOB has a float 12
Of course, the switching operation is effected by the magnet 121 on the 0 side. The leveler 100 activates one reed switch 110A at liquid level A to warn of a lack of liquid in the Nusta cylinder section 30, but the other reed switch 110B operates until the liquid level reaches B, which is lower than that. No switching operation is performed. Therefore, if a failure occurs in one system of the master cylinder section 30, the pump 70 will continue to operate for a while after the alarm of the master cylinder section 30 is issued. This ensures effective servo by the assist device M50. In addition, from each reed switch IIOA, 110B, lead wires 112a, 1
12b extends to the upper end of the guide 101, and is connected to an external circuit from a terminal portion 114 provided there. In addition, since it is preferable that the bottom of the chamber 83c in which the leveler 100 is placed is made deeper, it is preferable to arrange the chamber 83C at the farthest point from the cylinder body 12, as in the embodiment shown in the figure. For example, the leveler 100 may be placed in the center of a reservoir containing the leveler 100, and the liquid may be supplied to the pump 70 from there. Further, as a technique related to the present invention, the reed switch itself is left alone, and a time delay corresponding to the difference between the liquid level A and the liquid level B is caused in the control circuit of the pump 70. How to do this, or
It is also conceivable to provide another auxiliary reservoir outside the reservoir 80 to ensure a minimum fluid volume for the pump 70. However, in the former case, the setting time is unknown and additional external circuitry is required, and in the latter case, the installation of an auxiliary reservoir and its space are required. In this respect, the present invention, including the illustrated embodiment, can overcome all such difficulties. (Effects of the Invention) According to the present invention, since appropriate alarm signals are obtained from each leveler 100, an effective servo can be operated even when one of the brake circuits fails.

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

第1図は、この発明の一実施例を示す断面構造図である
. 30・・・マスタシリンダ部,50・・・助勢装置,7
0・・・ポンプ,80・・・リザーバ、82・・・隔壁
、83a,83b,83C”室,100− ・レベラー
(液面検知装置).IIOA,IIOB・・・リードス
イッチ、120・・・磁石付きフロート.出願人 日本
エヤーブレーキ株式会社 代理人 弁理士 保 科 敏 夫
FIG. 1 is a cross-sectional structural diagram showing an embodiment of the present invention. 30... Master cylinder section, 50... Assisting device, 7
0... Pump, 80... Reservoir, 82... Partition wall, 83a, 83b, 83C" chamber, 100- Leveler (liquid level detection device). IIOA, IIOB... Reed switch, 120... Float with magnet. Applicant: Japan Air Brake Co., Ltd. Agent: Toshio Yasushina, patent attorney

Claims (1)

【特許請求の範囲】 1、外部動力により駆動されるポンプからの圧液をサー
ボ圧として利用する助勢装置と、その助勢装置からの助
勢力を受けて圧力を発生させるマスタシリンダと、助勢
装置から排出されてくる圧液を貯えるとともに、マスタ
シリンダおよびポンプに作動液を供給可能なリザーバと
を備え、そのリザーバは、マスタシリンダ用に所定液量
を確保するように内部に隔壁が所定高さまで設けられて
おり、隔壁で区分された一方がマスタシリンダに、他方
がポンプに各々連絡した助勢装置付きマスタシリンダに
おいて、前記リザーバに、磁石付きフロートの移動に応
じて異なる液面レベルで作動する2つのリードスイッチ
をもつ液面検知装置を設けた助勢装置付きマスタシリン
ダ。 2、マスタシリンダは2系統型のものであり、リザーバ
は隔壁によって3室に区分され、その中の2室がマスタ
シリンダ側に連絡し、残りの一室がポンプに連絡してお
り、しかも、その残りの一室の中に、液面検知装置が設
けられている、請求項1に記載した助勢装置付きマスタ
シリンダ。
[Scope of Claims] 1. An assisting device that uses pressure fluid from a pump driven by external power as servo pressure, a master cylinder that generates pressure by receiving the assisting force from the assisting device, and an assisting device. The reservoir is equipped with a reservoir capable of storing the discharged pressure fluid and supplying working fluid to the master cylinder and the pump, and the reservoir has a partition wall inside thereof up to a predetermined height to secure a predetermined amount of fluid for the master cylinder. In the master cylinder with an auxiliary device, one of which is connected to the master cylinder and the other is connected to the pump, separated by a partition wall, there are two in the reservoir, which operate at different liquid levels according to the movement of the magnetic float. A master cylinder with an assist device equipped with a liquid level detection device with a reed switch. 2. The master cylinder is a two-system type, and the reservoir is divided into three chambers by a partition wall, two of which are connected to the master cylinder side, and the remaining chamber is connected to the pump, and, The master cylinder with an assisting device according to claim 1, wherein a liquid level detection device is provided in the remaining one chamber.
JP1050772A 1989-03-02 1989-03-02 Master cylinder with assist device Expired - Lifetime JP2724611B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1050772A JP2724611B2 (en) 1989-03-02 1989-03-02 Master cylinder with assist device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1050772A JP2724611B2 (en) 1989-03-02 1989-03-02 Master cylinder with assist device

Publications (2)

Publication Number Publication Date
JPH02231260A true JPH02231260A (en) 1990-09-13
JP2724611B2 JP2724611B2 (en) 1998-03-09

Family

ID=12868124

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1050772A Expired - Lifetime JP2724611B2 (en) 1989-03-02 1989-03-02 Master cylinder with assist device

Country Status (1)

Country Link
JP (1) JP2724611B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009040359A (en) * 2007-08-10 2009-02-26 Toyota Motor Corp Brake control device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572134U (en) * 1978-11-13 1980-05-17
JPS61212751A (en) * 1985-03-18 1986-09-20 Toyoda Gosei Co Ltd Moisture component alarm of water absorbing fluid for automobile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572134U (en) * 1978-11-13 1980-05-17
JPS61212751A (en) * 1985-03-18 1986-09-20 Toyoda Gosei Co Ltd Moisture component alarm of water absorbing fluid for automobile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009040359A (en) * 2007-08-10 2009-02-26 Toyota Motor Corp Brake control device
US8246122B2 (en) 2007-08-10 2012-08-21 Toyota Jidosha Kabushiki Kaisha Brake control system and brake control method

Also Published As

Publication number Publication date
JP2724611B2 (en) 1998-03-09

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