JPH01208260A - Tandem type master cylinder - Google Patents
Tandem type master cylinderInfo
- Publication number
- JPH01208260A JPH01208260A JP63031099A JP3109988A JPH01208260A JP H01208260 A JPH01208260 A JP H01208260A JP 63031099 A JP63031099 A JP 63031099A JP 3109988 A JP3109988 A JP 3109988A JP H01208260 A JPH01208260 A JP H01208260A
- Authority
- JP
- Japan
- Prior art keywords
- plunger
- cylinder
- bearing
- sleeve
- seal member
- 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
Links
- 230000002093 peripheral effect Effects 0.000 abstract description 12
- 239000003921 oil Substances 0.000 description 24
- 238000005192 partition Methods 0.000 description 8
- 239000010720 hydraulic oil Substances 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Transmission Of Braking Force In Braking Systems (AREA)
Abstract
Description
【発明の詳細な説明】
Ａ０発明の目的
（１）産業上の利用分野
本発明は、第１および第２油溜を備えたシリンダ本体と
、このシリンダ本体のシリンダ孔に嵌装されたスリーブ
と、このスリーブ内に摺動自在に嵌合されてシリンダ孔
の前端壁との間に前部油圧室を画成する前部プランジャ
と、この前部プランジャとの間に後部油圧室を画成すべ
くスリーブ内に摺動自在に嵌合される後部プランジャと
、前部プランジャを後退方向へ付勢する前部戻しぼねと
、後部プランジャを後退方向へ付勢する後部戻しぼねと
、シリンダ孔に装着されて前部プランジャの外周面にリ
ップを密接させる前部一方向シール部材と、スリーブに
装着されて後部プランジャの外周面にリップを密接させ
る後部一方向シール部材と、この後部一方向シール部材
の後方で後部プランジャの外周面を摺動自在に支承すべ
くシリンダ本体に取付けられた軸受とからなり、前部プ
ランジャには、それが所定の後退限にあるとき前部一方
向シール部材の直後で第１油溜および前部油圧室間を連
通ずる前部リリーフポートを設け、また後部プランジャ
には、それが所定の後退限にあるとき後部一方向シール
部材の直後で第２油溜および後部油圧室間を連通ずる後
部リリーフポートを設けたタンデム型マスタシリンダの
改良に関する。Detailed Description of the Invention A0 Object of the Invention (1) Industrial Application Field The present invention relates to a cylinder body provided with first and second oil reservoirs, a sleeve fitted into a cylinder hole of the cylinder body, and a sleeve fitted into a cylinder hole of the cylinder body. a front plunger slidably fitted within the sleeve to define a front hydraulic chamber between the sleeve and the front end wall of the cylinder bore; and a rear hydraulic chamber defined between the front plunger and the front plunger. A rear plunger that is slidably fitted into the sleeve, a front return spring that biases the front plunger in the backward direction, a rear return spring that biases the rear plunger in the backward direction, and a cylinder hole. A front one-way seal member that is attached to the sleeve and brings its lip into close contact with the outer circumferential surface of the front plunger; a rear one-way seal member that is attached to the sleeve and brings its lip into close contact with the outer circumferential surface of the rear plunger; and this rear one-way seal member. and a bearing attached to the cylinder body to slidably support the outer circumferential surface of the rear plunger at the rear of the front plunger. The rear plunger is provided with a front relief port that communicates between the first oil sump and the front hydraulic chamber, and the rear plunger is provided with a second oil sump and the rear hydraulic chamber immediately after the rear one-way seal member when the rear plunger is at a predetermined retraction limit. This invention relates to an improvement of a tandem type master cylinder provided with a rear relief port that communicates between hydraulic chambers.
（２）従来の技術
この種マスタシリンダは、例えば特開昭５８−１６９５
２号公報に開示されるように、既に知られており、その
ものではスリーブをシリンダ本体に固定するために、ス
リーブの後端に当接する軸受をシリンダ本体に螺着して
いる。(2) Prior art This type of master cylinder is known, for example, from Japanese Patent Application Laid-Open No. 58-1695.
As disclosed in Japanese Patent No. 2, this is already known, and in order to fix the sleeve to the cylinder body, a bearing that abuts the rear end of the sleeve is screwed onto the cylinder body.
（３）発明が解決しようとする課題
上記のようなマスタシリンダでは、シリンダ本体のシリ
ンダ孔に嵌装されたスリーブに対してシリンダ本体に螺
着される軸受の同軸性を確保することが加工精度上非常
に困難であって、この両者に亘り後部プランジャが摺動
するとき、摺動抵抗が増大したり、摺動面にかじりを生
じたりする惧れがある。(3) Problems to be Solved by the Invention In the above-mentioned master cylinder, it is important to ensure the coaxiality of the bearing screwed into the cylinder body with respect to the sleeve fitted into the cylinder hole of the cylinder body. This is extremely difficult, and when the rear plunger slides between these two areas, there is a risk that sliding resistance will increase or galling will occur on the sliding surface.
本発明は、か＼る点に鑑みてなされたもので、スリーブ
に対する軸受の同軸性を容易に確保でき、これにより後
部プランジャの摺動を常に円滑になし得るようにした前
記タンデム型マスタシリ・ンダを提供することを目的と
する。The present invention has been made in view of the above-mentioned problems, and provides a tandem-type master cylinder cylinder which can easily ensure the coaxiality of the bearing with respect to the sleeve, thereby making it possible for the rear plunger to always slide smoothly. The purpose is to provide
Ｂ１発明の構成
（］）課題を解決するための手段
上記目的を達成するために、本発明は、シリンダ本体に
、シリンダ孔の後端開口部に在って半径方向内方へ向か
う複数の内向き突起を設け、軸受を、シリンダ孔に回動
可能に嵌装されてスリーブ後端に当接する筒状部と、こ
の筒状部後端に在って相隣る内向き突起間の切欠き部を
通過し、且つ筒状部の回動で複数の内向き突起前面にそ
れぞれ係合する複数の外向き突起とより構成し、少なく
とも１つの切欠き部に、相隣る外向き突起間に介入する
ストップ部材を装着したことを特徴とする。B1 Structure of the Invention (]) Means for Solving the Problems In order to achieve the above object, the present invention provides a cylinder body with a plurality of internal holes located at the rear end opening of the cylinder hole and directed radially inward. A cylindrical part that is rotatably fitted into the cylinder hole and comes into contact with the rear end of the sleeve, and a notch between adjacent inward protrusions on the rear end of the cylindrical part. a plurality of outward protrusions that pass through the cylindrical part and engage with the front surfaces of the plurality of inward protrusions when the cylindrical part rotates; It is characterized by being equipped with an intervening stop member.
（２）作 用
前記のように軸受の筒状部をシリンダ孔に嵌装すると、
加工精度上、スリーブに対する軸受の同軸性を容易に確
保することができる。(2) Effect When the cylindrical part of the bearing is fitted into the cylinder hole as described above,
In terms of processing accuracy, coaxiality of the bearing with respect to the sleeve can be easily ensured.
またシリンダ孔に対する軸受の挿脱および回動ならびに
ストップ部材の着脱といった極めて簡単な操作により、
シリンダ本体に対して軸受を容易に着脱し得るので、マ
スタシリンダのメンテナンス性を良好にすることができ
る。In addition, extremely simple operations such as inserting and removing the bearing in the cylinder hole, rotating it, and attaching and detaching the stop member,
Since the bearing can be easily attached to and detached from the cylinder body, maintenance of the master cylinder can be improved.
（３）実施例
第１図において、Ｍは自動車の２系統式油圧ブレーキ用
のタンデム型マスタシリンダで、そのシリンダ本体１は
、図示しない車体に支持される負圧ブースタＢのブース
タシェル２前面に後端部を固着される。(3) Embodiment In FIG. 1, M is a tandem type master cylinder for a two-system hydraulic brake of an automobile, and its cylinder body 1 is attached to the front surface of a booster shell 2 of a negative pressure booster B supported by a vehicle body (not shown). The rear end is fixed.
シリンダ本体ｌの上側に補助油溜筒３が一体に連設され
、それに主油溜筒４が連結される。主油溜筒４は上端に
キャップ５を有し、また内部にキャップ５に支持される
公知の油面レベルセンサ６を備えている。An auxiliary oil reservoir 3 is integrally provided on the upper side of the cylinder body 1, and a main oil reservoir 4 is connected thereto. The main oil reservoir 4 has a cap 5 at its upper end, and is provided with a known oil level sensor 6 supported by the cap 5 inside.
補助油溜筒３の内部は隔壁７により第１および第２油溜
８１．８ｇに区画され、これら油溜８゜、８□はそれぞ
れ主油溜筒４から作動油を補給される。The inside of the auxiliary oil reservoir 3 is divided by the partition wall 7 into a first oil reservoir 81.8 g and a second oil reservoir 81.8 g, and these oil reservoirs 8° and 8□ are each supplied with hydraulic oil from the main oil reservoir 4.
第１および第２油溜８１．８□はそれぞれ通孔り、９ｚ
を介してシリンダ本体ｌのシリンダ孔１０と連通される
。シリンダ孔ｌＯは、前端を閉 ′じた第１孔１
０ａ１この第１孔１０ａより大径でその後端に連なる第
２孔１０ｂおよびこの第２孔１０ｂより大径でその後端
に連なり且つ後端を開放した第３孔１０ｃからなる。第
２孔１０ｂに前部隔壁カラー１２．の大径前部ａが嵌合
され、このカラー１２１の大径前部ａおよび小径後部す
間のフランジ部Ｃ後面に、第３孔１０ｃに嵌装されたス
リーブ１３が当接し、また小径後部すはスリーブ１３の
前端部に嵌合される。スリーブ１３の後端部に後部隔壁
カラー１２□の大径前部ａが嵌合され、このカラー１２
□の大径前部ａおよび小径後部す間のフランジ部Ｃ後面
に第３孔１０ｃに配設された軸受１４が当接し、また小
径後部すは軸受１４の凹部１５に嵌合される。シリンダ
本体１に対する軸受１４の取付構造については後述する
。The first and second oil reservoirs 81.8□ are each through-hole, 9z
It communicates with the cylinder hole 10 of the cylinder body l via. The cylinder hole lO is a first hole 1 whose front end is closed.
0a1 Consists of a second hole 10b having a larger diameter than the first hole 10a and continuous to the rear end, and a third hole 10c having a larger diameter than the second hole 10b and continuous to the rear end and having an open rear end. The front partition collar 12 is inserted into the second hole 10b. The large-diameter front part a of the collar 121 is fitted, and the sleeve 13 fitted in the third hole 10c is in contact with the rear surface of the flange part C between the large-diameter front part a and the small-diameter rear space of this collar 121, and the small-diameter rear part The sleeve 13 is fitted into the front end of the sleeve 13. The large diameter front part a of the rear bulkhead collar 12□ is fitted to the rear end of the sleeve 13, and this collar 12
The bearing 14 disposed in the third hole 10c is in contact with the rear surface of the flange C between the large diameter front section a and the small diameter rear section □, and the small diameter rear section is fitted into the recess 15 of the bearing 14. The mounting structure of the bearing 14 to the cylinder body 1 will be described later.
前部隔壁カラー１２．のフランジ部Ｃ外周面および第３
孔１０ｃ内周面間に前部通孔９．に連なる前部環状油室
１１１が画成される。また後部隔壁カラー１２ｚのフラ
ンジ部Ｃ外周面および第３孔１０ｃ内周面間に画成され
た後部環状油室１１＝はスリーブ１３外周面を走る軸方
向溝１３ａおよび環状溝１３ｂを介して後部通孔９□に
連通ずる。Front bulkhead collar 12. The outer peripheral surface of the flange portion C and the third
Front through hole 9 between the inner peripheral surfaces of hole 10c. A front annular oil chamber 111 is defined. Further, the rear annular oil chamber 11= defined between the outer circumferential surface of the flange portion C of the rear bulkhead collar 12z and the inner circumferential surface of the third hole 10c is connected to the rear via an axial groove 13a and an annular groove 13b running on the outer circumferential surface of the sleeve 13. It communicates with through hole 9□.
前部隔壁カラー１２１およびスリーブ１３前部並びに後
部隔壁カラー１２ｚおよびスリーブ１３後部に前後一対
のプランジャ１６１．１６□が前後方向摺動自在に嵌合
されており、前部プランジャ１６．および第１孔１０ａ
の前端壁間に前部油圧室１７．が画成され、また両プラ
ンジャ１６１．１６８間に後部油圧室１７□が画成され
る。これら油圧室１７．．１７□は、シリンダ本体１の
前、後部出力ポート１Ｂ＋、１８ｚを介して２系統の各
ブレーキ油圧回路に連通ずる。A pair of front and rear plungers 161.16□ are fitted to the front part of the front partition collar 121 and the front part of the sleeve 13, and to the rear part of the rear partition collar 12z and the sleeve 13 so as to be slidable in the front and rear direction. and first hole 10a
The front hydraulic chamber 17. is defined, and a rear hydraulic chamber 17□ is defined between both plungers 161 and 168. These hydraulic chambers 17. ．． 17□ communicates with each of the two brake hydraulic circuits via the front and rear output ports 1B+ and 18z of the cylinder body 1.
後部プランジャ１６□の後端は、その外周面を摺動自在
に支承する軸受１４を貫通してシリンダ本体１の後方へ
延び、さらにブースタシェル２の前壁を貫通して負圧ブ
ースタＢの出力杆１９に連接する。The rear end of the rear plunger 16□ extends to the rear of the cylinder body 1 by passing through a bearing 14 that slidably supports the outer peripheral surface of the rear plunger 16□, and further passes through the front wall of the booster shell 2 to receive the output of the negative pressure booster B. Connect to rod 19.
この後部プランジャ１６□が貫通するブースタシェル２
の透孔２０からその内部の負圧が漏洩するのを防止する
ために、後部プランジャ１６□の外周面にリップを密接
させるシール部材２１がシリンダ本体１およびブースタ
シェル２間に挟持される。Booster shell 2 that this rear plunger 16□ penetrates
In order to prevent the internal negative pressure from leaking through the through hole 20 of the rear plunger 16, a sealing member 21 whose lip is brought into close contact with the outer peripheral surface of the rear plunger 16□ is sandwiched between the cylinder body 1 and the booster shell 2.
第１．第６図に明示するように、後部油圧室１７□およ
び後部出力ポート１８□間を連通ずるために、スリーブ
１３には、その内周面を走る長短二種の複数の軸方向溝
２３．．２３．、横孔２４、および外周面を走る環状溝
２５が設けられる。1st. As clearly shown in FIG. 6, in order to communicate between the rear hydraulic chamber 17□ and the rear output port 18□, the sleeve 13 has a plurality of axial grooves 23. of two types, long and short, running on its inner peripheral surface. ．． 23. , a horizontal hole 24, and an annular groove 25 running on the outer circumferential surface.
後部プランジ中１６□に、その前端面に開口する有底の
ばね保持孔３１□が設けられ、その孔３１ｚにプランジ
ャ１６□を後退方向に付勢する後部戻しばね３０゜が収
容される。また、後部プランジャ１６ｔに、ばね保持孔
３１２の端壁から一定長さ軸方向に突出するボルト３２
が螺着され、このボルト３２に後部戻しばね３０□の前
端を支承するハツト形のばね保持筒３３が一定のストロ
ーク範囲で摺動自在に連結される。A bottomed spring holding hole 31□ that opens at the front end surface of the rear plunger 16□ is provided, and a rear return spring 30° that biases the plunger 16□ in the backward direction is housed in the hole 31z. Further, a bolt 32 is attached to the rear plunger 16t and protrudes from the end wall of the spring holding hole 312 by a certain length in the axial direction.
A hat-shaped spring holding cylinder 33, which supports the front end of the rear return spring 30□, is connected to this bolt 32 so as to be slidable within a certain stroke range.
ばね保持筒３３のフランジ部３３ａは放射方向へ突出す
る複数個の突起ｐを備え、各突起ｐがスリーブ１３の短
い軸方向溝２３．に係合される。The flange portion 33a of the spring holding cylinder 33 is provided with a plurality of protrusions p projecting in the radial direction, and each protrusion p is connected to the short axial groove 23. of the sleeve 13. is engaged with.
その軸方向溝２３＋の後端はスリーブ１３と一体のスト
ッパ壁２９により閉じられており、このストッパ壁２９
に上記突起Ｐが当接することにより後部プランジャ１６
□の所定の後退限が決定される。The rear end of the axial groove 23+ is closed by a stopper wall 29 that is integral with the sleeve 13.
When the projection P comes into contact with the rear plunger 16
A predetermined retraction limit of □ is determined.
第２．第３．第６図に明示するように、後部隔壁カラー
１２ｚのフランジ部Ｃに複数の切欠き部ｎが円周上等間
隔に形成される。また大径前部ａの前面に各切欠き部ｎ
に食込むように複数の放射状溝３４□が形成され、各溝
３４ｔは各切欠き部ｎを介して後部環状油室１１．に連
通ずる。これら放射状溝３４□からスリーブ１３の長い
軸方向溝２３□への作動油の流れのみを許容する後部一
方向シール部材３５□が、そのリップを後部プランジャ
１６□の外周面に密接させてスリーブ１３の後端部に装
着される。Second. Third. As clearly shown in FIG. 6, a plurality of notches n are formed at equal intervals on the circumference in the flange portion C of the rear partition wall collar 12z. In addition, each notch part n is provided on the front surface of the large diameter front part a.
A plurality of radial grooves 34□ are formed so as to cut into the rear annular oil chamber 11. It will be communicated to. The rear one-way seal member 35□, which allows only the flow of hydraulic oil from these radial grooves 34□ to the long axial groove 23□ of the sleeve 13, has its lip brought into close contact with the outer circumferential surface of the rear plunger 16□, and the sleeve 13 It is attached to the rear end of the
またスリーブ１３の後端部には後部一方向シール部材３
５□の前端部を保持するリテーナ３６゜と、後部一方向
シール部材３５□および後部隔壁カラ−１２□間に介装
された環状スペーサ３７□とが装着される。Also, a rear one-way seal member 3 is provided at the rear end of the sleeve 13.
A retainer 36° holding the front end of 5□, and an annular spacer 37□ interposed between the rear one-way seal member 35□ and the rear partition collar 12□ are attached.
後部プランジャ１６□に、それが所定の後退限にあると
き、後部一方向シール部材３５□の直後で放射状溝３４
□およびばね保持孔３１□間を連通する後部リリーフポ
ート３８２が穿設される。The rear plunger 16□ has a radial groove 34 immediately after the rear one-way seal member 35□ when it is at a predetermined retraction limit.
A rear relief port 382 communicating between □ and spring holding hole 31 □ is bored.
また軸受１４の凹部１５に後部プランジャ１６２の外周
面にリップを密接させるシール部材３９２が装着される
。Further, a seal member 392 is installed in the recess 15 of the bearing 14 to bring the lip into close contact with the outer peripheral surface of the rear plunger 162.
一方、前部プランジャ１６．に、その前端面に開口する
有底のばね保持孔３１１が設けられ、その孔３１．に前
部プランジャ１６．を後退方向に付勢する前部戻しばね
３０Ｉが収容される。前部プランジャ１６＋の所定の後
退限は、その後端がストッパ壁２９に当接する前記ばね
保持筒３３のフランジ部３３ａに当接することにより決
定される。On the other hand, the front plunger 16. A bottomed spring holding hole 311 is provided in the front end surface of the hole 31. Front plunger 16. A front return spring 30I is housed therein, which urges the front return spring 30I in the backward direction. The predetermined retraction limit of the front plunger 16+ is determined by the fact that its rear end abuts against the flange portion 33a of the spring retaining cylinder 33, which abuts against the stopper wall 29.
前部プランジャ１６１のばね保持孔３１＋ は、そのプ
ランジャ１６＋が第１孔１０ａの前端壁に当接するまで
前進するとき、前部戻しばね３０１全体を確実に収容し
得るように、前方過半部３１ａが拡径されている。その
ような拡径は、第１図に示すように段状にするか、また
はテーパ状にする。The spring retaining hole 31+ of the front plunger 161 is configured so that the front majority portion 31a can reliably accommodate the entire front return spring 301 when the plunger 16+ advances until it abuts the front end wall of the first hole 10a. The diameter has been expanded. Such expansion may be stepped or tapered as shown in FIG.
後部隔壁カラー１２□同様に、前部隔壁カラー１２１の
フランジ部Ｃに複数の切欠き部ｎが円周上等間隔に形成
される。また大径前部ａの前面に各切欠き部ｎに食込む
ように複数の放射状溝３４３が形成され、多溝３４．は
各切欠き部ｎを介して前部環状油室１１１に連通ずる。Similarly to the rear partition wall collar 12□, a plurality of notches n are formed in the flange portion C of the front partition wall collar 121 at equal intervals on the circumference. Further, a plurality of radial grooves 343 are formed on the front surface of the large-diameter front portion a so as to cut into each notch portion n, and multiple grooves 34. communicates with the front annular oil chamber 111 via each notch n.
これら放射状溝３４．から前部油圧室１７．への作動油
の流れのみを許容する前部一方向シール部材３５１が、
そのリップを前部プランジャ１６１の外周面に密接させ
て第２孔１０ｂに装着される。These radial grooves 34. From the front hydraulic chamber 17. A front one-way seal member 351 that allows hydraulic oil to flow only to
The front plunger 161 is attached to the second hole 10b with its lip brought into close contact with the outer peripheral surface of the front plunger 161.
第２孔１０ｂには、また、前部一方向シール部材３５．
の前端部を保持するリテーナ３６１と、そのシール部材
３５．および前部隔壁カラー１２、間に介装された環状
スペーサ３７．が装着される。The second hole 10b also includes a front one-way seal member 35.
a retainer 361 that holds the front end of the seal member 35. and the front bulkhead collar 12, with an annular spacer 37 interposed therebetween. is installed.
前部プランジャ１６．に、それが所定の後退限にあると
き、前部一方向シール部材３５．の直後で放射状溝３４
．およびばね保持孔３１５間を連通する前部リリーフポ
ート３８．が穿設される。Front plunger 16. When it is at the predetermined retraction limit, the front one-way seal member 35. Radial groove 34 immediately after
．． and the front relief port 38 communicating between the spring retaining hole 315. is drilled.
またスリーブ１３の前端部には、前部プランジャ１６＋
の外周面にリップを密接させるシール部材３９．が装
着される。Further, a front plunger 16+ is provided at the front end of the sleeve 13.
A seal member 39 that brings the lip into close contact with the outer peripheral surface of the seal member 39. is installed.
こ＼で、前、後部隔壁カラー１２．．１２２における各
放射状溝３４１，３４．の半径方向内端ｄは、第２．第
３図に明示するように各スペーサ３７、．３７ｆｆｉの
内周縁ｅよりも半径方向外方位置で終っている。Here, front and rear bulkhead collars 12. ．． Each radial groove 341, 34 . The radially inner end d of the second . As clearly shown in FIG. 3, each spacer 37, . It ends at a position radially outward from the inner peripheral edge e of 37ffi.
次に第１．第４．第５図によりシリンダ本体１に対する
軸受１４の取付構造について説明する。Next, the first. 4th. The mounting structure of the bearing 14 to the cylinder body 1 will be explained with reference to FIG.
シリンダ本体１において、第３兆１０ｃの後端開口部は
大径の環状段部４０に形成され、その段部４０の後端縁
に半径方向内方へ向かう複数の内向き突起４１が円周上
等間隔に形成される。各内向き突起４１の先端面は第３
孔１０ｃの延長内周面上に位置する。In the cylinder body 1, the rear end opening of the third trillion 10c is formed as a large-diameter annular step 40, and a plurality of inward protrusions 41 extending radially inward are provided on the rear end edge of the step 40 around the circumference. Formed at even intervals. The tip surface of each inward protrusion 41 is the third
It is located on the extended inner peripheral surface of the hole 10c.
軸受１４は、後部プランジャ１６□を支承する筒状部４
２と、その後端に形成されて半径方向外方へ向かう複数
の外向き突起４３とよりなり、各外向き突起４３は相隣
る内向き突起４１間の切欠き部４６に遊挿し得るように
なっている。The bearing 14 is a cylindrical portion 4 that supports the rear plunger 16□.
2 and a plurality of outward protrusions 43 formed at the rear end and directed radially outward, each outward protrusion 43 being able to be loosely inserted into a notch 46 between adjacent inward protrusions 41. It has become.
軸受１４の筒状部４２は、その外周面の環状溝４４に装
着されたリング状シール部材４５と共に第３孔１０ｃに
回動可能に嵌装され、その際各外向き突起４３は各切欠
き部４６を通過する。そして軸受１４を、その後端面に
開口する一対の係合孔４７に工具を係合して第３孔１０
ｃ軸線回りに回動させると、各外向き突起４３は各内向
き突起４１前面に係合する。The cylindrical portion 42 of the bearing 14 is rotatably fitted into the third hole 10c together with a ring-shaped seal member 45 attached to an annular groove 44 on the outer circumferential surface of the cylindrical portion 42, and at this time, each outward protrusion 43 is inserted into each notch. It passes through section 46. Then, the bearing 14 is inserted into the third hole 10 by engaging the tool with the pair of engagement holes 47 opened on the rear end surface.
When rotated about the c-axis, each outward protrusion 43 engages with the front surface of each inward protrusion 41.
軸受１４の回止めはストップ部材としてのストップばね
４８によりなされており、そのストップばね４８は、対
向片４９ａ、４９ｂを互に離間する方向に付勢したＵ字
形部４９と、各対向片４９ａ、４９ｂの先端に連設され
て、対向片４９ａ。The rotation of the bearing 14 is prevented by a stop spring 48 as a stop member, and the stop spring 48 includes a U-shaped portion 49 that biases opposing pieces 49a and 49b in a direction to separate them from each other, each opposing piece 49a, A facing piece 49a is connected to the tip of 49b.
４９ｂの外側に鋭角をもって折曲がる係合片５゜ａ、５
０ｂとよりなる。Ｕ字形部４９は１個の切欠き部４６に
、その両対向片４９ａ、４９ｂを互に接近する方向に撓
ませて装着され、両係合片４９ａ、４９ｂの先端部は相
隣る外向き突起４３の対向面および相隣る内向き突起４
１の前面にそれぞれ係合する。この係合によって、切欠
き部４６からのストップばね４８の脱落が防止され、ま
た軸受１４の回止めがなされる。Engagement pieces 5°a, 5 bent at an acute angle to the outside of 49b
0b and more. The U-shaped portion 49 is attached to one notch portion 46 by bending both opposing pieces 49a and 49b in a direction toward each other, and the tips of both engaging pieces 49a and 49b are bent outward toward each other. Opposing surfaces of protrusions 43 and adjacent inward protrusions 4
1, respectively. This engagement prevents the stop spring 48 from falling off from the notch 46 and also prevents the bearing 14 from rotating.
次にこの実施例の作用を説明する。Next, the operation of this embodiment will be explained.
いま、負圧ブースタＢを作動してその出力杆１９を前進
させれば、それに押圧されて両プランジャ１６．，１６
□がそれぞれ対応する戻しばね３０、．３０□を圧縮さ
せながら前進する。この場合、軸受１４の筒状部４２が
第３孔１０ｃに嵌装されているので、加工精度上、スリ
ーブ１３に対する軸受１４の同軸性が容易に確保されて
おり、したがって後部プランジャ１６□の摺動を円滑に
行うことができる。Now, if the negative pressure booster B is activated to advance its output rod 19, it will be pressed by it and both plungers 16. ,16
□ corresponds to the return springs 30, . Move forward while compressing 30□. In this case, since the cylindrical portion 42 of the bearing 14 is fitted into the third hole 10c, the coaxiality of the bearing 14 with respect to the sleeve 13 is easily ensured in terms of processing accuracy, and therefore the sliding of the rear plunger 16□ movement can be carried out smoothly.
そして、前部リリーフポート３８．が前部一方向シール
部材３５１の前方に移行すると、前部プランジャ１６．
の前進力に応じて前部油圧室１７、に油圧が発生し、ま
た後部リリーフポート３８２が後部一方向シール部材３
５ｔの前方へ移行すると、後部プランジャ１６□の前進
力に応じて後部油圧室１７□に油圧が発生する。and front relief port 38. moves forward of the front one-way seal member 351, the front plunger 16.
Hydraulic pressure is generated in the front hydraulic chamber 17 according to the forward force of the rear one-way seal member 3.
5t, hydraulic pressure is generated in the rear hydraulic chamber 17□ according to the forward force of the rear plunger 16□.
こうして前部および後部油圧室１７．．１７□に発生さ
せた油圧は対応する出カポ−１−１８１゜１８８から出
力され、２系統の油圧ブレーキを同時に作動させ、自動
車に制動をかけることができる。Thus the front and rear hydraulic chambers 17. ．． The hydraulic pressure generated at 17□ is outputted from the corresponding output coupler 1-181°188, and two systems of hydraulic brakes can be operated simultaneously to apply braking to the automobile.
制動を解除すべく、負圧ブースタＢを不作動状態に戻せ
ば、各プランジャｉ６＋、ｔ６□は対応する戻しばね３
０１，３０□の反発力によりそれぞれ所定の後退限に戻
されるが、その後退過程で各油圧室１７１．１７ｇが減
圧すれば、対応する一方向シール部材３５＋、３５□の
リップが前後の圧力差によりそれぞれ油圧室１７１．１
７□側へ撓むため、第１油溜８Ｉの作動油が、通孔９１
、前部環状油室１１Ｉ、放射状溝３４１および前部一方
向シール部材３５１のリップの内側を通して前部油圧室
１７１に補給され、また第２油溜８２の作動油が、通孔
９□、後部環状油室１１□、放射状溝３４□、後部一方
向シール部材３５□のリップの内側および長い軸方向溝
２３□を通して後部油圧室１７□に補給される。When the negative pressure booster B is returned to the inoperative state in order to release the brake, each plunger i6+, t6□ is activated by the corresponding return spring 3.
The repulsive forces of 01 and 30□ return each to the predetermined retraction limit, but if the pressure in each hydraulic chamber 171.17g is reduced during the retraction process, the lips of the corresponding one-way seal members 35+ and 35□ reduce the pressure difference between the front and rear. Hydraulic chamber 171.1 respectively
7□ side, the hydraulic oil in the first oil reservoir 8I flows through the through hole 91.
, the front hydraulic chamber 171 is supplied through the front annular oil chamber 11I, the radial groove 341, and the inside of the lip of the front one-way seal member 351, and the hydraulic oil in the second oil reservoir 82 is supplied through the through hole 9□, the rear The oil is supplied to the rear hydraulic chamber 17□ through the annular oil chamber 11□, the radial groove 34□, the inner side of the lip of the rear one-way seal member 35□, and the long axial groove 23□.
このとき、各油圧室１７．，１７□に作動油の過剰補給
が行われると、その過剰分は、各プランジャ１６．，１
６□が後退限に戻ったとき、各リリーフポート３Ｂ１，
３８２から油溜８１，８□側へ放出される。At this time, each hydraulic chamber 17. , 17□, the excess amount is transferred to each plunger 16. ,1
When 6□ returns to the backward limit, each relief port 3B1,
382 to the oil sump 81, 8□ side.
ところで、前、後部油圧室１７．．１７□の昇圧に伴い
前、後部一方向シール部材３５．．３５２がスペーサ３
１．．３７ｔを介し前、後部隔壁カラー１２１．１２ｚ
に押圧されるが、前記のように各放射状溝３４．，３４
□の内端ｄが各スペーサ３７．，３７アの内周縁ｅより
も半径方向外方に位置しているので、前、後部一方向シ
ール部材３５＋、３５□の後部内周縁が各放射状溝３４
＋、３４ｔに食込むことがなく、これにより前。By the way, the front and rear hydraulic chambers 17. ．． As the pressure of 17□ increases, the front and rear one-way seal members 35. ．． 352 is spacer 3
1. ．． Front and rear bulkhead collars 121.12z through 37t
, but as described above, each radial groove 34. ,34
The inner end d of □ is each spacer 37. , 37a, the rear inner peripheral edges of the front and rear one-way seal members 35+ and 35□ are located in the radial grooves 34.
+, 34t does not cut into the front.
後部一方向シール部材３５＋、３５□の耐久性を向上さ
せ、また前、後部プランジャ１６１，１６２の進退を円
滑に行うことができる。The durability of the rear one-way seal members 35+, 35□ can be improved, and the front and rear plungers 161, 162 can be moved back and forth smoothly.
マスタシリンダＭのメンテナンスに当っては、ストップ
ばね４８を外し、次いで軸受１４を回動させて各内向き
突起４１と各外向き突起４３とを食違わせれば、軸受１
４をシリンダ本体１より取外すことができ、また軸受１
４の取付けも容易であるから作業性が良好になる。When maintaining the master cylinder M, remove the stop spring 48, then rotate the bearing 14 to align each inward protrusion 41 and each outward protrusion 43, and the bearing 1
4 can be removed from the cylinder body 1, and the bearing 1 can be removed from the cylinder body 1.
Since the installation of item 4 is easy, the workability is improved.
Ｃ０発明の効果
本発明によれば、スリーブに対する軸受の同軸性を容易
に確保して後部プランジャの摺動を常に円滑に行うこと
ができる。またマスタシリンダ本体に対する軸受の着脱
を容易にしてマスタシリンダのメンテナンス性を良好に
することができる。C0 Effects of the Invention According to the present invention, the coaxiality of the bearing with respect to the sleeve can be easily ensured, and the rear plunger can always slide smoothly. Furthermore, the bearing can be easily attached and detached from the master cylinder body, thereby improving the maintainability of the master cylinder.
図面は本発明の一実施例を示すもので、第１図はタンデ
ム型マスタシリンダの縦断側面図、第２図は第１図の部
分拡大図、第３図は第１図■−■線断面図、第４図は第
１図■−ＩＶ線断面図、第５図は第４図■−Ｖ線断面図
、第６図は要部の分解斜視図である。
Ｍ・・・タンデム型マスタシリンダ
ト・・シリンダ本体、８１，８□・・・第１．第２油溜
、１０・・・シリンダ孔、１３・・・スリーブ、１４・
・・軸受、１６．．１６□・・・前、後部プランジャ、
１７、．１７□・・・前、後部油圧室、３Ｌ、３０ｇ・
・・前、後部戻しばね、３５１．３５ｔ・・・前、後部
一方向シール部材、３Ｌ、３ｓ、・・・前、後部リリー
フポート、４１・・・内向き突起、４２・・・筒状部、
４３・・・外向き突起、４６・・・切欠き部、４８・・
・ストップ部材としてのストップばねThe drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional side view of a tandem type master cylinder, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 4 is a sectional view taken along line 1--IV in FIG. 1, FIG. 5 is a sectional view taken along line 2--V in FIG. M...Tandem type master cylinder...Cylinder body, 81,8□...1st. 2nd oil sump, 10... cylinder hole, 13... sleeve, 14...
...Bearing, 16. ．． 16□・・・front, rear plunger,
17. 17□・・・Front, rear hydraulic chamber, 3L, 30g・
...Front, rear return spring, 351.35t...Front, rear one-way seal member, 3L, 3s,...Front, rear relief port, 41...Inward projection, 42...Cylindrical part ,
43... outward protrusion, 46... notch, 48...
・Stop spring as a stop member
Claims (1)
ンダ本体のシリンダ孔に嵌装されたスリーブと、このス
リーブ内に摺動自在に嵌合されてシリンダ孔の前端壁と
の間に前部油圧室を画成する前部プランジャと、この前
部プランジャとの間に後部油圧室を画成すべくスリーブ
内に摺動自在に嵌合される後部プランジャと、前部プラ
ンジャを後退方向へ付勢する前部戻しばねと、後部プラ
ンジャを後退方向へ付勢する後部戻しぼねと、シリンダ
孔に装着されて前部プランジャの外周面にリップを密接
させる前部一方向シール部材と、スリーブに装着されて
後部プランジャの外周面にリップを密接させる後部一方
向シール部材と、この後部一方向シール部材の後方で後
部プランジャの外周面を摺動自在に支承すべくシリンダ
本体に取付けられた軸受とからなり、前部プランジャに
は、それが所定の後退限にあるとき前部一方向シール部
材の直後で第１油溜および前部油圧室間を連通する前部
リリーフポートを設け、また後部プランジャには、それ
が所定の後退限にあるとき後部一方向シール部材の直後
で第２油溜および後部油圧室間を連通する後部リリーフ
ポートを設けたタンデム型マスタシリンダにおいて、シ
リンダ本体に、シリンダ孔の後端開口部に在って半径方
向内方へ向かう複数の内向き突起を設け、軸受を、シリ
ンダ孔に回動可能に嵌装されてスリーブ後端に当接する
筒状部と、この筒状部後端に在って相隣る内向き突起間
の切欠き部を通過し、１つ筒状部の回動で複数の内向き
突起前面にそれぞれ係合する複数の外向き突起とより構
成し、少なくとも１つの切欠き部に、相隣る外向き突起
間に介入するストップ部材を装着したことを特徴とする
、タンデム型マスタシリンダ。A cylinder body having first and second oil reservoirs, a sleeve fitted into a cylinder hole of this cylinder body, and a front end wall of the cylinder hole which is slidably fitted into this sleeve. a front plunger defining a rear hydraulic chamber; a rear plunger slidably fitted within a sleeve to define a rear hydraulic chamber between the front plunger; and a rear plunger for moving the front plunger in a backward direction. a front return spring that urges the rear plunger in the backward direction; a front one-way seal member that is attached to the cylinder hole and brings the lip into close contact with the outer circumferential surface of the front plunger; a rear one-way seal member that is attached to bring the lip into close contact with the outer circumferential surface of the rear plunger; a bearing that is attached to the cylinder body to slidably support the outer circumferential surface of the rear plunger behind the rear one-way seal member; The front plunger is provided with a front relief port that communicates between the first oil reservoir and the front hydraulic chamber immediately after the front one-way seal member when the front plunger is at a predetermined retraction limit, and the rear plunger is provided with a front relief port that communicates between the first oil sump and the front hydraulic chamber immediately after the front one-way seal member. In the tandem type master cylinder, which is provided with a rear relief port that communicates between the second oil sump and the rear hydraulic chamber immediately after the rear one-way seal member when the cylinder is at a predetermined retraction limit, a cylinder hole is formed in the cylinder body. A plurality of inward protrusions are provided at the rear end opening and extend radially inward, and the bearing is connected to a cylindrical portion rotatably fitted into the cylinder hole and abutting the rear end of the sleeve, and the cylinder. A plurality of outward protrusions that are located at the rear end of the tubular part, pass through a notch between adjacent inward protrusions, and respectively engage the front surfaces of the plurality of inward protrusions by rotation of one tubular part. 1. A tandem-type master cylinder, characterized in that a stop member intervening between adjacent outward protrusions is attached to at least one notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63031099A JPH01208260A (en) | 1988-02-12 | 1988-02-12 | Tandem type master cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63031099A JPH01208260A (en) | 1988-02-12 | 1988-02-12 | Tandem type master cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01208260A true JPH01208260A (en) | 1989-08-22 |
| JPH049698B2 JPH049698B2 (en) | 1992-02-21 |
Family
ID=12321952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63031099A Granted JPH01208260A (en) | 1988-02-12 | 1988-02-12 | Tandem type master cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01208260A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994010017A1 (en) * | 1992-10-26 | 1994-05-11 | Allied-Signal Inc. | Master cylinder with non-threaded end cap retention |
| WO2004094208A1 (en) * | 2003-04-23 | 2004-11-04 | Bosch Corporation | Plunger-type master cylinder |
| EP3103690A1 (en) * | 2008-12-16 | 2016-12-14 | Gustav Magenwirth GmbH & Co. KG | Master cylinder |
-
1988
- 1988-02-12 JP JP63031099A patent/JPH01208260A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994010017A1 (en) * | 1992-10-26 | 1994-05-11 | Allied-Signal Inc. | Master cylinder with non-threaded end cap retention |
| WO2004094208A1 (en) * | 2003-04-23 | 2004-11-04 | Bosch Corporation | Plunger-type master cylinder |
| US7181911B2 (en) | 2003-04-23 | 2007-02-27 | Bosch Corporation | Plunger type master cylinder |
| EP3103690A1 (en) * | 2008-12-16 | 2016-12-14 | Gustav Magenwirth GmbH & Co. KG | Master cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH049698B2 (en) | 1992-02-21 |
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