JPS63227455A - Tandem master cylinder - Google Patents
Tandem master cylinderInfo
- Publication number
- JPS63227455A JPS63227455A JP62060838A JP6083887A JPS63227455A JP S63227455 A JPS63227455 A JP S63227455A JP 62060838 A JP62060838 A JP 62060838A JP 6083887 A JP6083887 A JP 6083887A JP S63227455 A JPS63227455 A JP S63227455A
- Authority
- JP
- Japan
- Prior art keywords
- plunger
- cylinder
- spring
- hole
- hydraulic chamber
- 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
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 239000003921 oil Substances 0.000 description 22
- 230000002093 peripheral effect Effects 0.000 description 10
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method 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、シリンダ本体と、このシリン多゛本体のシリ
ンダ孔に挿入されてそ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るように前記シリンダ孔に挿入され
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
する後部戻しばねとからなる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 Field of Application The present invention provides a front hydraulic chamber between a cylinder body and a front end wall inserted into a cylinder hole of this multi-cylinder body. a front plunger inserted into the cylinder hole so as to define a rear hydraulic chamber between the front plunger and the front plunger; and a front return spring that biases the front plunger in a backward direction. and a rear return spring that biases the rear plunger in the backward direction.
（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号公報に開示されているように、既に知られている。(2) Prior art This type of master cylinder is known, for example, from Japanese Patent Application Laid-Open No. 58-1695.
This is already known as disclosed in Publication No. 2.
（３）発明が解決しようとする問題点
従来のこの種マスタシリンダでは、後部プランジャの後
退限を規制するために、プランジャの後端面を受止める
筒状のストッパ部材をシリンダ本体の後端部に嵌着して
いるので、シリンダ本体の後端部を、後退位置の後部プ
ランジャの後端まで後方へ長く延出させなければならず
、これがシリンダ本体のコンパクト化の障害となってい
る。(3) Problems to be Solved by the Invention In conventional master cylinders of this type, a cylindrical stopper member that receives the rear end surface of the plunger is provided at the rear end of the cylinder body in order to restrict the retraction limit of the rear plunger. Since it is fitted, the rear end of the cylinder body must extend rearward for a long time to the rear end of the rear plunger in the retracted position, which is an obstacle to making the cylinder body more compact.
本発明は、かかる事情に鑑みてなされたもので、シリン
ダ本体のコンパクト化を図りつつ前、後部両プランジャ
の後退限を規制し得る簡単有効な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 circumstances, and it is an object of the present invention to provide a simple and effective tandem-type master cylinder that can regulate the retraction limits of both the front and rear plungers while making the cylinder body more compact.
Ｂ０発明の構成
（１１問題点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、後部プランジャ
に、その前方に突出する膨大頭部付の案内軸を突設し、
この案内軸上を摺動し得ると共にその膨大頭部に当接し
得るばね保持筒と後部プランジャとの間に後部戻しばね
を縮設し、ばね保持筒には半径方向外方へ突出する突片
を形成し、該突片が摺動自在に係合する軸方向の案内溝
と、該突片を受止めてその後退限を規制するストッパ壁
とを後部油圧室の内周壁に形成したことを特徴とする。B0 Structure of the Invention (Means for Solving Problems 11) In order to achieve the above object, the present invention provides a guide shaft with an enlarged head protruding forward from the rear plunger,
A rear return spring is compressed between the rear plunger and a spring holding cylinder that can slide on the guide shaft and come into contact with the enlarged head of the guide shaft, and the spring holding cylinder has a projecting piece that protrudes outward in the radial direction. , and an axial guide groove in which the projecting piece slidably engages, and a stopper wall that receives the projecting piece and restricts its retreat limit are formed on the inner circumferential wall of the rear hydraulic chamber. Features.
（２）作 用
マスタシリンダの不作動状態において、案内軸及びばね
保持筒は協働して後部戻しばねの伸長限界を規制し、こ
れにより前部及び後部プランジャ相互の間隔を決定し、
同時にばね保持筒の突片を後部油圧室内周壁のストッパ
壁に当接することにより、前、後部両プランジャの後退
限を規制する。(2) Operation: In the inoperative state of the master cylinder, the guide shaft and the spring holding tube cooperate to restrict the extension limit of the rear return spring, thereby determining the mutual spacing between the front and rear plungers;
At the same time, the protruding piece of the spring retaining cylinder abuts against the stopper wall of the peripheral wall of the rear hydraulic chamber, thereby regulating the backward limit of both the front and rear plungers.
（３）実施例 以下、図面により本発明の一実施例について説明する。(3) Examples An embodiment of the present invention will be described below with reference to the drawings.
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。Reference numeral M designates a tandem type master cylinder for a two-system hydraulic brake of an automobile, and its cylinder body 1 has its rear end fixed to the front surface of a booster shell 2 of a negative pressure booster B supported by a vehicle body (not shown).
シリンダ本体ｌの上側には補助油溜筒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、また内部にはキャップ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 to it. The main oil reservoir 4 has a cap 5 at its upper end, and is equipped 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及び第２油溜８
．．８□に区画され、これら油溜８１＋８８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 separated by a partition wall 7 into first and second oil reservoirs 8.
．． ．． These oil reservoirs 81+88 are each supplied with hydraulic oil from the main oil reservoir 4.
第１及び第２油溜８３，８□はそれぞれ通孔９８．９□
を介してシリンダ本体１のシリンダ孔ｌＯと連通される
。シリンダ孔１０は、前端を閉じた第１孔１０ａ１この
第１孔１０ａより大径でその後端に連なる第２孔１０ｂ
、この第２孔１０ｂより大径でその後端に連なる第３孔
１０Ｃ１及びこの第３孔１０ｃより大径でその後端に連
なり且つ後端を開放した第４孔１０ｄとからなっており
、第２孔１０ｂ及び第３孔ｔｏｅ間の段部に前部隔壁カ
ラー１２．が嵌合され、このカラー１２１の後面に当接
するスリーブ１３が第３孔１０ｃ及び第４孔１０ｄにか
けて嵌合され、このスリーブ１３の後端に当接する後部
隔壁カラー１２を及びこのカラー１２１の後面に当接す
る軸受１４が第４孔１０ｄに嵌合され、そして軸受１４
の後面を押える環状の押えねじ１５が第４孔１０ｄの後
端部より螺着される。The first and second oil reservoirs 83, 8□ each have a through hole 98.9□
It communicates with the cylinder hole lO of the cylinder body 1 via. The cylinder hole 10 includes a first hole 10a whose front end is closed and a second hole 10b which has a larger diameter than the first hole 10a and which is connected to the rear end.
, a third hole 10C1 having a larger diameter than this second hole 10b and continuous to the rear end, and a fourth hole 10d having a larger diameter than this third hole 10c and continuous to the rear end and having an open rear end. A front partition collar 12 is provided at the step between the hole 10b and the third hole toe. The sleeve 13 that abuts the rear surface of this collar 121 is fitted over the third hole 10c and the fourth hole 10d, and the rear bulkhead collar 12 that abuts the rear end of this sleeve 13 and the rear surface of this collar 121 are fitted. The bearing 14 that abuts is fitted into the fourth hole 10d, and the bearing 14
An annular retaining screw 15 for pressing the rear surface is screwed from the rear end of the fourth hole 10d.
スリーブ１３は、その外周面により、前部通孔９１に連
なる前部環状油室１１．を第３孔１０ｃに画成し、また
前記通孔９□に連なる後部環状油室１１．を第４孔１０
ｄに画成する。The sleeve 13 has a front annular oil chamber 11 connected to the front passage hole 91 by its outer peripheral surface. is defined in the third hole 10c, and a rear annular oil chamber 11. is connected to the through hole 9□. The fourth hole 10
d.
スリーブ１３には前後一対のプランジャ１６゜、１６ｇ
が摺動され、前部プランジャ１６．と第工孔ｔＯａＯ前
端壁間に前部油圧室１７．が画成され、両プランジャ１
６１．１６．間に後部油圧室１７ｔが画成される。これ
ら油圧室１７．．１７！は、シリンダ本体ｌの前、後部
出力ボートｌＬ、１８ｔを介して２系統の各ブレーキ油
圧回路と連通される。The sleeve 13 has a pair of front and rear plungers 16° and 16g.
is slid and the front plunger 16. and the front hydraulic chamber 17. between the front end wall of the first hole tOaO. is defined, both plungers 1
61.16. A rear hydraulic chamber 17t is defined between them. These hydraulic chambers 17. ．． 17! is communicated with each of the two brake hydraulic circuits via the front and rear output boats LL and 18t of the cylinder body 1.
後部プランジャ１６□の後端は、後部隔壁カラー１２８
及び軸受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と連接する。The rear end of the rear plunger 16□ is connected to the rear bulkhead collar 128.
and extends to the rear of the cylinder body 1 through the bearing 14,
Furthermore, it passes through the front wall of the booster shell 2 and is connected to the output rod 19 of the negative pressure booster B.
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及びブースタシ
ェル２間に挟持される。Booster shell 2 that this rear plunger 16□ penetrates
In order to prevent the negative pressure inside the rear plunger 16. A sealing member 21 is sandwiched between the cylinder body 1 and the booster shell 2, the lip of which is brought into close contact with the outer peripheral surface of the cylinder body 1.
後部油圧室１７ｇ及び後部出カポ−）ＩＬ間を連通ずる
ために、スリーブ１３には、その内周面を前端から後端
に３条の走る軸方向溝２３、外周面を走る環状溝２５、
及び各軸方、間溝２３と環状溝２５間を連通ずる横孔２
４が設けられる。In order to communicate between the rear hydraulic chamber 17g and the rear output capo (IL), the sleeve 13 has three axial grooves 23 running from the front end to the rear end on the inner peripheral surface thereof, an annular groove 25 running on the outer peripheral surface,
and a horizontal hole 2 communicating between the groove 23 and the annular groove 25 in each axial direction.
4 is provided.
後部プランジャ１６．の前端面には、該プランジャ１６
！を後退方向に付勢する後部戻しばね３０□を受容する
有底のばね保持孔３１！が設けられる。また、後部プラ
ンジャ１６．には、ばね保持孔３１ｚの端壁から一定長
さ軸方向に突出する案内軸３２が螺着され、その先端に
は膨大頭部３２ａが形成されている。この案内軸３２に
は後部戻しばね３０２の前端を支承するハツト形のばね
保持筒３３が摺動自在に嵌装されており、このばね保持
筒３３が前記膨大頭部３２ａに当接することにより後部
戻しばね３０ｆｆｉの伸長限界が規制されるようになっ
ている。Rear plunger 16. The plunger 16 is mounted on the front end surface of the plunger 16.
! A bottomed spring holding hole 31 that receives a rear return spring 30 □ that urges the rearward return spring 30□ in the backward direction! is provided. Also, the rear plunger 16. A guide shaft 32 is screwed onto the guide shaft 32, which projects from the end wall of the spring holding hole 31z by a certain length in the axial direction, and has an enlarged head 32a formed at its tip. A hat-shaped spring holding cylinder 33 that supports the front end of the rear return spring 302 is slidably fitted into this guide shaft 32, and when this spring holding cylinder 33 comes into contact with the enlarged head 32a, the rear The extension limit of the return spring 30ffi is regulated.
このばね保持筒３３には、半径方向外方に突出する３個
の突片３３ａが一体に形成され、これら突片３３ａが摺
動自在に係合する軸方向の３条の案内溝２８がスリーブ
１３の内周壁に前記軸方向溝２３と円周上交互に形成さ
れる。これら案内溝２８はスリーブ１３の前端から始ま
ってその中間部で終っており、その終端はスリーブ１３
と一体のストッパ壁２９で閉じられる。This spring holding cylinder 33 is integrally formed with three protruding pieces 33a that protrude outward in the radial direction, and three guide grooves 28 in the axial direction in which these protruding pieces 33a are slidably engaged are formed on the sleeve. The axial grooves 23 and the axial grooves 23 are formed on the inner peripheral wall of the groove 13 alternately on the circumference. These guide grooves 28 start from the front end of the sleeve 13 and end in the middle thereof;
It is closed by a stopper wall 29 that is integrated with.
上記案内溝２８は、突片３３ａの前後摺動に伴い案内溝
２８内の油が突片３３ａの前後に流通し得るように、突
片３３ａより充分大きな横断面形状が与えられ、また軸
方向溝２３は、これに突片３３ａが挿入されるような誤
組を防止するために、突片３３ａの挿入し得ない横断面
形状が与えられる。The guide groove 28 is given a cross-sectional shape that is sufficiently larger than the protruding piece 33a so that the oil in the guide groove 28 can flow in the front and back of the protruding piece 33a as the protruding piece 33a slides back and forth. The groove 23 is given a cross-sectional shape in which the protruding piece 33a cannot be inserted, in order to prevent incorrect assembly such as the protruding piece 33a being inserted therein.
後部隔壁カラー１２□には後部環状油室１１□に連なる
放射状溝３４ｇが形成され、この溝３４２からスリーブ
１３の軸方向溝２３への油の流れ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後端部に装着され
る。A radial groove 34g connected to the rear annular oil chamber 11□ is formed in the rear bulkhead collar 12□, and a rear one-way seal member 35□ allows oil to flow from this groove 342 to the axial groove 23 of the sleeve 13. its lip to the rear plunger 16
! The sleeve 13 is attached to the rear end of the sleeve 13 in close contact with the outer peripheral surface of the sleeve 13.
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３６ｔと、後部一方向
シール部材３５．及び後部隔壁カラ−１２ｚ間に挿入さ
れるスペーサ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.
5. a retainer 36t that holds the front end of the rear one-way seal member 35. and a spacer 37 inserted between the rear bulkhead collar 12z. is installed.
後部プランジャ１６ｇ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３５．の直後で放射状溝３
４ｇ及びばね保持孔３１間を連通ずる後部リリーフボー
ト３８３が穿設される。The rear plunger 16g has a rear one-way seal member 35. when the rear plunger 16g is at a predetermined retraction limit. Radial groove 3 immediately after
4g and a rear relief boat 383 that communicates with the spring holding hole 31 is bored.
また軸受１４には後部プランジャ１６８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。The bearing 14 also includes a sealing member 39 whose lip is brought into close contact with the outer peripheral surface of the rear plunger 168. is installed.
一方、前部プランジャ１６．の前端は、前部隔壁カラー
１２１を貫通して第１孔１０ａまで延びており、その前
端面には、前部プランジャ１６＋を後退方向に付勢する
前部戻しばね３０．を受容する有底のばね保持孔３１１
が設けられる。On the other hand, the front plunger 16. extends through the front bulkhead collar 121 to the first hole 10a, and has a front return spring 30. on its front end surface that biases the front plunger 16+ in the backward direction. A bottomed spring holding hole 311 that receives the
is provided.
前部隔壁カラー１２．には、前部環状油室１１１に連な
る放射状溝３４．が設けられており、この溝３４．から
前部油圧室１７１への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１
６．の外周面に密接させて第２孔１０ｂに装着される。Front bulkhead collar 12. , a radial groove 34. is connected to the front annular oil chamber 111. This groove 34. The front one-way seal member 351, which allows oil to flow only from the front hydraulic chamber 171 to the front hydraulic chamber 171, connects its lip to the front plunger 1.
6. It is attached to the second hole 10b in close contact with the outer peripheral surface of.
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、該シール部材３
５．及び前部隔壁カラー１２１間に挿入されるスペーサ
３７１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 3;
5. and a spacer 371 inserted between the front partition collar 121.
前部プランジャ１６１には、それが所定の後退限にある
とき、放射状溝３４１及びばね保持孔３１１間を連通ず
る前部リリーフボート３８Ｉが穿設される。The front plunger 161 is provided with a front relief boat 38I that communicates between the radial groove 341 and the spring retaining hole 311 when the plunger 161 is at a predetermined retraction limit.
またスリーブ１３の前端部には、前部プランジャ１６１
の外周面にリップを密接させるシール部材３９１が装着
される。Further, a front plunger 161 is provided at the front end of the sleeve 13.
A sealing member 391 is attached to bring the lip into close contact with the outer peripheral surface of the housing.
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ＩＬ、１６ｇ
がそれぞれ対応する戻しばね３０１．３０ｔを圧縮させ
ながら前進する。そして、前部プランジャ１６＋のリリ
ーフボート３８１が前部一方向シール部材３５．の前方
に移行すると、前部プランジャ１６１の前進力に応じて
前部油圧室１７．に油圧が発生し、また後部プランジャ
１６□のリリーフボート３８：が後部一方向シール部材
３５．の前方へ移行すると、後部プランジャ１６２の前
進力に応じて後部油圧室１７冨に油圧が発生する。Now, if the negative pressure booster B is activated and its output rod 19 is advanced, it will be pressed by it and both plungers IL, 16g
move forward while compressing the corresponding return springs 301 and 30t. Then, the relief boat 381 of the front plunger 16+ is connected to the front one-way seal member 35. When the front hydraulic chamber 17. moves forward, the front hydraulic chamber 17. Hydraulic pressure is generated, and the relief boat 38 of the rear plunger 16□ is connected to the rear one-way seal member 35. When moving forward, hydraulic pressure is generated in the rear hydraulic chamber 17 according to the forward force of the rear plunger 162.
こうして前部及び後部油圧室１７ｔ、１７ｇに発生させ
た油圧は対応する出力ポート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。The hydraulic pressure generated in the front and rear hydraulic chambers 17t and 17g is outputted from the corresponding output ports 181 and 188, and the two systems of hydraulic brakes can be operated simultaneously to brake 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１６．．ＩＬは対応する戻しばねａｏ
＋、３ｏｚ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ＬＬ、１７ｇが減圧す
れば、対応する一方向シール部材ａｓ＋、ｓｓｔのリッ
プが前後の圧力差によりそれぞれ油圧室１７１．１７□
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１１１、放射状溝３４１及び前部一方向シー
ル部材３５．のリップの内側を通して前部油圧室１７．
に補給され、また第２油溜８２の作動油が、通孔９ｔｓ
後部環状油室１１ｔ、放封状溝３４□、後部一方向シー
ル部材３５ｔのリップの内側及び軸方向溝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 16. ．． IL is the corresponding return spring ao
The repulsive forces of + and 3 oz return each to the predetermined retraction limit, but if the pressure in each hydraulic chamber LL and 17g decreases during the retraction process, the lips of the corresponding one-way seal members as+ and sst will move due to the pressure difference between the front and rear. Hydraulic chamber 171.17□
Because it bends to the side, the hydraulic oil in the first oil reservoir 8I flows through the through hole 91, the front annular oil chamber 111, the radial groove 341, and the front one-way seal member 35. through the inside of the lip of the front hydraulic chamber 17.
The hydraulic oil in the second oil reservoir 82 is supplied through the through hole 9ts.
The oil is supplied to the rear hydraulic chamber 17□ through the rear annular oil chamber 11t, the opening groove 34□, the inner side of the lip of the rear one-way seal member 35t, and the 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ｉｓ、、ｔ
６ｔが後退限に戻ったとき、各リリーフボート３８．，
３８１から油溜８．、Ｂｔ側へ放出される。At this time, each hydraulic chamber 17. , 17□, the excess amount is transferred to each plunger is,,t
When the 6t returns to the retreat limit, each relief boat 38. ，
381 to oil sump 8. , released to the Bt side.
ところで、ばね保持筒３３の突片３３ａは、スリーブ１
３の軸方向に延びる案内溝２８に摺動自在に係合してい
るので、前部プランジャＬＬ と共にばね保持筒３３が
前後動することを何等妨げない。By the way, the protruding piece 33a of the spring holding cylinder 33 is attached to the sleeve 1.
Since the spring holding cylinder 33 is slidably engaged with the guide groove 28 extending in the axial direction of the front plunger LL, it does not prevent the spring holding cylinder 33 from moving back and forth together with the front plunger LL.
また、前、後部プランジャ１６＋、１６ｇの後退時には
、ばね保持筒３３が案内軸３２の膨大頭部３２ａに当接
することにより後部戻しばね３０２の伸長限界、したが
って両プランジャ１６１゜１６！相互の間隔が決定され
る。これと同時に突片３３ａがスリーブ１３のストッパ
壁２９に受止められ、且つ案内軸３２の膨大頭部３２ａ
がばね保持筒３３に受止められることにより後部プラン
ジャ１６．の後退限が規制され、一方、前部プランジ＋
１６Ｉは、その後端を突片３３ａを介してストッパ壁２
９に受止められることにより後退限が規制される。Furthermore, when the front and rear plungers 16+ and 16g retreat, the spring retaining cylinder 33 comes into contact with the enlarged head 32a of the guide shaft 32, thereby reaching the extension limit of the rear return spring 302, and therefore both plungers 161°16! The mutual spacing is determined. At the same time, the projecting piece 33a is received by the stopper wall 29 of the sleeve 13, and the enlarged head 32a of the guide shaft 32
The rear plunger 16. is received by the spring retaining cylinder 33. The retraction limit is regulated, while the front plunge +
16I connects its rear end to the stopper wall 2 via the projecting piece 33a.
9, the backward limit is regulated.
Ｃ０発明の効果
以上のように本発明によれば、後部プランジャに、その
前方に突出する膨大頭部付の案内軸を突設し、この案内
軸上を摺動し得ると共にその膨大頭部に当接し得るばね
保持筒と後部プランジャとの間に後部戻しばねを縮設し
、ばね保持筒には半径方向外方へ突出する突片を形成し
、該突片が摺動自在に係合する軸方向の案内溝と、該突
片を受止めてその後退限を規制するストッパ壁とを後部
油圧室の内周壁に形成したので、後部戻しばねの前端を
支承するばね保持筒を有効に利用して後部油圧室内で前
、後部両プランジャの後退限を規制することができ、し
たがって後部プランジャの後端部を露出させるようにシ
リンダ本体の短縮化が可能であると共に構造の簡素化を
もたらすことができ、その上、前、後部戻しばねのセン
ト荷重をどのように設定しても、各プランジャの後退限
に狂いを生じることな（、従ってそれら戻しばねのセン
ト荷重を変えることにより、前、後部油圧室の出力特性
を異にする各種タンデム型マスタシリンダを提供するこ
とができる。C0 Effects of the Invention As described above, according to the present invention, the rear plunger is provided with a guide shaft with an enlarged head that projects forward, and can slide on this guide shaft, and the enlarged head can be slid on the rear plunger. A rear return spring is compressed between the spring retaining tube and the rear plunger that can come into contact with each other, and the spring retaining tube has a protruding piece that protrudes radially outward, and the protruding piece is slidably engaged with the spring retaining tube. An axial guide groove and a stopper wall that receives the projecting piece and restricts its backward limit are formed on the inner circumferential wall of the rear hydraulic chamber, making effective use of the spring holding cylinder that supports the front end of the rear return spring. The retraction limit of both the front and rear plungers can be regulated in the rear hydraulic chamber, and therefore the cylinder body can be shortened to expose the rear end of the rear plunger, and the structure can be simplified. Moreover, no matter how you set the center loads of the front and rear return springs, the retraction limit of each plunger will not be distorted (therefore, by changing the center loads of these return springs, the front, Various tandem-type master cylinders with different output characteristics of the rear hydraulic chamber can be provided.
図面は本発明の一実施例を示すもので、第１図はマスタ
シリンダの縦断側面図、第２図は第１図のｎ−ｎ線断面
図、第３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
■・・・シリンダ本体、１０・・・シリンダ孔、１６１
．１６ｇ・・前、後部プランジャ、１７７．１７ｔ・・
・前、後部油圧室、２８・・案内溝、２９・・・ス）７
バ壁、３０１．３０．・・・前、後部戻しばね、３２・
・・案内軸、３２ａ・・・膨大頭部、３３・・・ばね保
持筒、３３ａ・・・突片The drawings show one embodiment of the present invention; FIG. 1 is a vertical side view of the master cylinder, FIG. 2 is a sectional view taken along the line nn of FIG. 1, and FIG. 3 is an exploded perspective view of the main parts. be. M... Tandem type master cylinder ■... Cylinder body, 10... Cylinder hole, 161
．． 16g...front, rear plunger, 177.17t...
・Front and rear hydraulic chambers, 28...Guide groove, 29...S)7
Bar wall, 301.30. ...Front and rear return springs, 32.
... Guide shaft, 32a ... Enlarged head, 33 ... Spring holding cylinder, 33a ... Projection piece
Claims (1)
されてそ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
画成するように前記シリンダ孔に挿入される後部プラン
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
ばねとからなるタンデム型マスタシリンダにおいて、後
部プランジャに、その前方に突出する膨大頭部付の案内
軸を突設し、この案内軸上を摺動し得ると共にその膨大
頭部に当接し得るばね保持筒と後部プランジャとの間に
後部戻しばねを縮設し、ばね保持筒には半径方向外方へ
突出する突片を形成し、該突片が摺動自在に係合する軸
方向の案内溝と、該突片を受止めてその後退限を規制す
るストッパ壁とを後部油圧室の内周壁に形成したことを
特徴とするタンデム型マスタシリンダ。A front plunger is inserted into the cylinder hole of the cylinder body to define a front hydraulic chamber between the cylinder body and the front end wall of the cylinder body, and a rear hydraulic chamber is defined between the front plunger and the front plunger. In the tandem type master cylinder, the rear plunger includes a rear plunger that is inserted into the cylinder hole, a front return spring that biases the front plunger in the backward direction, and a rear return spring that biases the rear plunger in the backward direction. A guide shaft with an enlarged head protruding forward is provided on the plunger, and a rear return is provided between the rear plunger and a spring retaining cylinder that can slide on the guide shaft and can come into contact with the enlarged head. The spring is compressed, and the spring holding cylinder is formed with a protruding piece that protrudes outward in the radial direction, and an axial guide groove in which the protruding piece is slidably engaged, and an axial guide groove that receives the protruding piece and then A tandem type master cylinder characterized in that a stopper wall for regulating retraction is formed on the inner circumferential wall of a rear hydraulic chamber.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62060838A JPS63227455A (en) | 1987-03-16 | 1987-03-16 | Tandem master cylinder |
| KR1019870013717A KR900006600B1 (en) | 1987-03-06 | 1987-12-02 | Master cylinder with piston retainer |
| US07/148,515 US4887517A (en) | 1987-03-06 | 1988-01-26 | Master cylinder with piston retainer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62060838A JPS63227455A (en) | 1987-03-16 | 1987-03-16 | Tandem master cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63227455A true JPS63227455A (en) | 1988-09-21 |
| JPH0427060B2 JPH0427060B2 (en) | 1992-05-08 |
Family
ID=13153901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62060838A Granted JPS63227455A (en) | 1987-03-06 | 1987-03-16 | Tandem master cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63227455A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57197354U (en) * | 1981-06-12 | 1982-12-15 |
-
1987
- 1987-03-16 JP JP62060838A patent/JPS63227455A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57197354U (en) * | 1981-06-12 | 1982-12-15 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0427060B2 (en) | 1992-05-08 |
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