JPH0528775U - Master cylinder - Google Patents

Master cylinder

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Publication number
JPH0528775U
JPH0528775U JP078355U JP7835591U JPH0528775U JP H0528775 U JPH0528775 U JP H0528775U JP 078355 U JP078355 U JP 078355U JP 7835591 U JP7835591 U JP 7835591U JP H0528775 U JPH0528775 U JP H0528775U
Authority
JP
Japan
Prior art keywords
piston
hydraulic pressure
pressure generating
generating chamber
master cylinder
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
JP078355U
Other languages
Japanese (ja)
Other versions
JP2529292Y2 (en
Inventor
典久 樋口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissin Kogyo Co Ltd
Original Assignee
Nissin Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissin Kogyo Co Ltd filed Critical Nissin Kogyo Co Ltd
Priority to JP1991078355U priority Critical patent/JP2529292Y2/en
Priority to KR92000299U priority patent/KR960003502Y1/en
Publication of JPH0528775U publication Critical patent/JPH0528775U/en
Application granted granted Critical
Publication of JP2529292Y2 publication Critical patent/JP2529292Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B60T11/00Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/10Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
    • B60T11/16Master control, e.g. master cylinders
    • B60T11/236Piston sealing arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

(57)【要約】 【目的】ピストンがその一端を液圧発生室に臨ませてシ
リンダ体内に摺動自在に嵌合され、ピストンの外周に設
けられる装着溝には、シリンダ体内面に摺接するリップ
を有して液圧発生室側に開いた横断面略J字状のカップ
シールが装着されるマスタシリンダにおいて、部品点数
の増加を回避してカップシールの倒れによるシール不良
を防止する。 【構成】ピストン10の外周には、一端を液圧発生室1
1に連通させるとともに他端を装着溝15に開口させる
複数の補給溝23,24,25が設けられる。
(57) [Abstract] [Purpose] A piston is slidably fitted into the cylinder body with one end facing the fluid pressure generating chamber, and is in sliding contact with the inner surface of the cylinder in a mounting groove provided on the outer circumference of the piston. In a master cylinder to which a cup seal having a lip and opened to the hydraulic pressure generating chamber side and having a substantially J-shaped cross section is mounted, an increase in the number of parts is avoided and a seal failure due to the collapse of the cup seal is prevented. [Structure] On the outer circumference of the piston 10, one end is provided with a hydraulic pressure generating chamber 1.
There are provided a plurality of supply grooves 23, 24, 25 which communicate with 1 and open the other end to the mounting groove 15.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、ピストンがその一端を液圧発生室に臨ませてシリンダ体内に摺動自 在に嵌合され、ピストンの外周に設けられる装着溝には、シリンダ体内面に摺接 するリップを有して液圧発生室側に開いた横断面略J字状のカップシールが装着 されるマスタシリンダに関する。 According to the present invention, the piston is slidably fitted into the cylinder body with one end of the piston facing the fluid pressure generating chamber, and the mounting groove provided on the outer circumference of the piston has a lip that slides on the inner surface of the cylinder. Further, the present invention relates to a master cylinder to which a cup seal having a substantially J-shaped cross section opened to the hydraulic pressure generating chamber side is mounted.

【0002】[0002]

【従来の技術】[Prior Art]

従来、かかるマスタシリンダでは、図8(a)で示すように、ピストン84の ガイド部84aに、カップシール80を装着させる装着溝81が設けられるとと もに、装着溝81内に液圧発生室82から作動液を潤滑用として導く連通孔83 が穿設されている。 Conventionally, in such a master cylinder, as shown in FIG. 8A, a guide groove 84a of a piston 84 is provided with a mounting groove 81 for mounting a cup seal 80, and a hydraulic pressure is generated in the mounting groove 81. A communication hole 83 is formed to guide the hydraulic fluid from the chamber 82 for lubrication.

【0003】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

上記従来のものでは、液圧発生室82の容積を増大させる方向(矢印方向)に ピストン84を急激に作動させたときには、カップシール80のリップ80aが その前後の圧力差により図8(b)で示すように液圧発生室82側に倒れ、装着 溝81の一方の側面81aに密接して連通孔83が閉塞されることがある。而し て液圧発生室82の容積を増大させる側へのピストン84の作動が終了したとき に、リップ80aはシリンダ体86の内面に摺接する方向に復帰しようとする。 しかるにピストン84のガイド部84aと、シリンダ体86の内面との間の間隙 は極めて小さいので、前記連通孔83が閉塞された時点でリップ80aおよびシ リンダ体86内面間に生じる環状室87から液圧発生室82への作動液の流通が 制限され、それによりシリンダ体86内面に摺接する側へのリップ80aの復帰 が著しく遅延する。したがってリップ80aが復帰していない状態でピストン8 4を反矢印方向に作動させて液圧発生室82の圧力を増大させることもあり、そ の場合、カップシール80によるシールが不充分となる。 In the above-mentioned conventional type, when the piston 84 is suddenly operated in the direction of increasing the volume of the hydraulic pressure generating chamber 82 (the direction of the arrow), the lip 80a of the cup seal 80 is caused by the pressure difference before and after that, as shown in FIG. As shown in FIG. 3, the communication hole 83 may fall toward the hydraulic pressure generating chamber 82 side and close to the one side surface 81 a of the mounting groove 81 to close the communication hole 83. When the operation of the piston 84 toward the side that increases the volume of the hydraulic pressure generating chamber 82 is completed, the lip 80a tries to return in the direction of sliding contact with the inner surface of the cylinder body 86. However, since the gap between the guide portion 84a of the piston 84 and the inner surface of the cylinder body 86 is extremely small, the liquid from the annular chamber 87 generated between the lip 80a and the inner surface of the cylinder body 86 when the communication hole 83 is closed. The flow of the hydraulic fluid to the pressure generating chamber 82 is restricted, which significantly delays the return of the lip 80a to the side that comes into sliding contact with the inner surface of the cylinder body 86. Therefore, the piston 84 may be actuated in the direction opposite to the arrow in the state where the lip 80a is not restored, and the pressure of the hydraulic pressure generating chamber 82 may be increased. In that case, the sealing by the cup seal 80 becomes insufficient.

【0004】 そこで、実公昭62−25963号公報で開示されたマスタシリンダでは、液 圧発生室82の容積を増大させる側にピストン84を付勢するばねとピストン8 4との間に挟持した部材に、連通孔83から装着溝81側に突出するストッパ部 を設け、該ストッパ部によってカップシール80の倒れを阻止するようにしてい るが、カップシール80の倒れを防止するためだけの専用の部品が必要であり、 部品点数が増加する。Therefore, in the master cylinder disclosed in Japanese Utility Model Publication No. 62-25963, a member sandwiched between a spring biasing the piston 84 toward the side that increases the volume of the hydraulic pressure generating chamber 82 and the piston 84. In addition, a stopper portion protruding from the communication hole 83 to the mounting groove 81 side is provided to prevent the cup seal 80 from collapsing, but a dedicated part only for preventing the cup seal 80 from collapsing. Is required, and the number of parts increases.

【0005】 本考案は、かかる事情に鑑みてなされたものであり、部品点数の増加を回避し てカップシールの倒れによるシール不良を防止し得るようにしたマスタシリンダ 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 an object of the present invention is to provide a master cylinder capable of avoiding an increase in the number of parts and preventing a seal failure due to the collapse of the cup seal. ..

【0006】[0006]

【課題を解決するための手段】[Means for Solving the Problems]

上記目的を達成するために、本考案の第1の特徴によれば、ピストンの外周に は、一端を液圧発生室に連通させるとともに他端を装着溝に開口させる複数の補 給溝が設けられる。 To achieve the above object, according to the first aspect of the present invention, a plurality of supplementary grooves are provided on the outer circumference of the piston, one end of which communicates with the hydraulic pressure generating chamber and the other end of which opens into a mounting groove. Be done.

【0007】 また本考案の第2の特徴によれば、装着溝の相互に対向する側面のうち液圧発 生室側の側面周縁部には、液圧発生室側に向かうにつれて大径となるテーパ面が 設けられる。Further, according to the second feature of the present invention, of the side surfaces of the mounting groove facing each other, the peripheral edge portion of the side surface on the hydraulic pressure generating chamber side has a larger diameter toward the hydraulic pressure generating chamber side. A tapered surface is provided.

【0008】[0008]

【実施例】【Example】

以下、図面により本考案の実施例について説明する。 An embodiment of the present invention will be described below with reference to the drawings.

【0009】 図1ないし図4は本考案を自動車のクラッチ作動装置用マスタシリンダに適用 したときの一実施例を示すものであり、図1はマスタシリンダの縦断側面図、図 2はピストンの拡大縦断面図、図3は図1の3部拡大図、図4は図2の4矢視正 面図である。1 to 4 show an embodiment in which the present invention is applied to a master cylinder for a clutch operating device of an automobile, FIG. 1 is a vertical sectional side view of the master cylinder, and FIG. 2 is an enlarged piston. FIG. 3 is a longitudinal sectional view, FIG. 3 is an enlarged view of part 3 in FIG. 1, and FIG. 4 is a front view taken in the direction of arrow 4 in FIG.

【0010】 クラッチ作動装置用のマスタシリンダMC は、有底のシリンダ穴8を有して有 底円筒状に形成されるシリンダ体9を備え、前記シリンダ穴8内には、該シリン ダ穴8の閉塞端すなわちシリンダ体9の前端壁9aとの間に液圧発生室11を画 成してピストン10が摺動可能に嵌合される。The master cylinder M C for the clutch operating device is provided with a cylinder body 9 having a bottomed cylinder hole 8 and formed into a bottomed cylindrical shape, and the cylinder hole 8 has the cylinder hole 8 therein. A fluid pressure generating chamber 11 is defined between the closed end of the cylinder 8, that is, the front end wall 9a of the cylinder body 9, and the piston 10 is slidably fitted therein.

【0011】 図2を併せて参照して、ピストン10は鋳造されるものであり、このピストン 10には、シリンダ穴8に摺接するガイド部12,13,14が前方から後方( 図2の左方から右方)に向けて順に軸方向に間隔をあけて設けられ、ガイド部1 2,13間に装着溝15が形成され、ガイド部13,14間にはガイド部13と の間に段差部16を介在させて装着溝17が形成され、さらにガイド部14には グリス溜め溝18が設けられる。而して、装着溝15にはカップシール20が、 また装着溝17にはカップシール21がそれぞれ装着される。Referring also to FIG. 2, the piston 10 is cast, and the piston 10 has guide portions 12, 13, 14 slidingly contacting the cylinder hole 8 from the front to the rear (left in FIG. 2). From the right side to the right side), the mounting groove 15 is formed between the guide portions 12 and 13, and the step between the guide portions 13 and 14 is formed between the guide portions 13 and 14. A mounting groove 17 is formed with the portion 16 interposed, and a grease reservoir groove 18 is provided in the guide portion 14. Thus, the cup seal 20 is mounted in the mounting groove 15, and the cup seal 21 is mounted in the mounting groove 17.

【0012】 図3において、装着溝15は、相互に対向する一対の側面15a,15bと、 それらの側面15a,15b間を連結する底面15cとで形成される。しかも両 側面15a,15bのうち、液圧発生室11側の側面15aにおける周縁部には 、液圧発生室11側に向かうにつれて大径となるテーパ面15a′が設けられる 。In FIG. 3, the mounting groove 15 is formed by a pair of side surfaces 15a and 15b facing each other and a bottom surface 15c connecting the side surfaces 15a and 15b. Moreover, a taper surface 15a 'having a diameter increasing toward the hydraulic pressure generating chamber 11 side is provided at the peripheral edge of the side face 15a on the hydraulic pressure generating chamber 11 side of both side faces 15a, 15b.

【0013】 一方、カップシール20は、従来周知のものであり、シリンダ穴8の内面に弾 発的に摺接するリップ20aを有して液圧発生室11側に開いた横断面略J字状 に形成される。On the other hand, the cup seal 20 is a conventionally well-known one, and has a lip 20 a that elastically comes into sliding contact with the inner surface of the cylinder hole 8 and has a substantially J-shaped cross section opened toward the hydraulic pressure generation chamber 11 side. Formed in.

【0014】 図4において、ピストン10におけるガイド部12の外周には、一端を液圧発 生室11に連通させるとともに他端を装着溝15の側面15aに開口させる複数 たとえば3つの補給溝23,24,25が周方向に等間隔をあけて設けられる。 しかも各補給溝23〜25は、ピストン10の半径方向に沿ってテーパ面15a ′の小径端よりも内方側に底部を有するようにしてそれぞれ形成される。In FIG. 4, on the outer periphery of the guide portion 12 of the piston 10, a plurality of, for example, three supply grooves 23, one end of which communicates with the hydraulic pressure generating chamber 11 and the other end of which is opened to the side surface 15 a of the mounting groove 15, 24 and 25 are provided at equal intervals in the circumferential direction. Moreover, each of the supply grooves 23 to 25 is formed along the radial direction of the piston 10 so as to have a bottom portion on the inner side of the smaller diameter end of the tapered surface 15a '.

【0015】 而してピストン10は、その軸線を含む平面を分割面26とした一対の鋳型2 7,28間で鋳造成形されるものであり、補給溝23は、ピストン10の軸線を 通って分割面26に直交する中心線C上に中心を有する半円形状に形成されるの に対し、補給溝24,25は、前記中心線Cとほぼ平行な平坦面24a,25a と円弧面24b,25bとから成るものであり、補給溝23とはわずかに異なる 形状を有する。このように各補給溝23,24,25を形成することにより、両 鋳型27,28を分割面26から相互に離反する方向に離型することを可能とし て、各補給溝23,24,25をピストン10の周方向等間隔に形成することが できる。The piston 10 is formed by casting between a pair of molds 27 and 28 having the plane including the axis thereof as the dividing surface 26, and the replenishment groove 23 passes through the axis of the piston 10. In contrast to being formed in a semicircular shape having a center on a center line C orthogonal to the dividing surface 26, the replenishment grooves 24, 25 have flat surfaces 24a, 25a and arc surfaces 24b, which are substantially parallel to the center line C. 25b and has a shape slightly different from the supply groove 23. By forming the replenishment grooves 23, 24, 25 in this way, it is possible to separate the two molds 27, 28 from the dividing surface 26 in the directions away from each other, and the replenishment grooves 23, 24, 25 are formed. Can be formed at equal intervals in the circumferential direction of the piston 10.

【0016】 再び図1において、シリンダ体9の前端壁9aには弁孔31が同軸に穿設され ており、該弁孔31はリザーバ29に連通される。またシリンダ体9の側部には 液圧発生室11内に常時連通する出力ポート30が設けられており、該出力ポー ト30はスレーブシリンダ38に接続される。Referring again to FIG. 1, a valve hole 31 is coaxially bored in the front end wall 9 a of the cylinder body 9, and the valve hole 31 communicates with the reservoir 29. Further, an output port 30 which is in constant communication with the hydraulic pressure generating chamber 11 is provided on a side portion of the cylinder body 9, and the output port 30 is connected to a slave cylinder 38.

【0017】 液圧発生室11内の前部には有底円筒状のケージ32が挿入されており、ピス トン10の前部に結合されたリテーナ33と前記ケージ32との間にはばね34 が縮設される。前記ケージ32内には、弁孔31を閉鎖可能な弁体35が収納さ れており、該弁体35およびケージ32間には弁孔31を閉鎖する方向に弁体3 5を付勢するばね36が縮設される。また弁体35には、ケージ32を移動自在 に貫通するロッド37が同軸に連接されており、このロッド37の後端部37a は、規制された範囲での軸方向相対移動を可能としてピストン10に係合される 。A cage 32 having a bottomed cylindrical shape is inserted in the front portion of the hydraulic pressure generating chamber 11, and a spring 34 is provided between the retainer 33 connected to the front portion of the piston 10 and the cage 32. Is reduced. A valve body 35 capable of closing the valve hole 31 is housed in the cage 32, and the valve body 35 is biased between the valve body 35 and the cage 32 in a direction of closing the valve hole 31. The spring 36 is contracted. Further, a rod 37 that movably penetrates the cage 32 is coaxially connected to the valve body 35, and a rear end portion 37a of the rod 37 allows the piston 10 to move relatively in the axial direction within a restricted range. Is engaged with.

【0018】 ピストン10の後端部には、プッシュロッド40が作用的に連結されており、 シリンダ体9の後端部には、プッシュロッド40の後退限すなわちピストン10 の後退限を規制するためのストッパ41が固定される。A push rod 40 is operatively connected to a rear end portion of the piston 10, and a rear end portion of the cylinder body 9 is for restricting a backward limit of the push rod 40, that is, a backward limit of the piston 10. The stopper 41 of is fixed.

【0019】 次にこの実施例の作用について説明すると、液圧発生室11の容積を増大させ る方向にピストン10を急激に後退させときに、カップシール20のリップ20 aが、図3の鎖線で示すように、前後の圧力差により前方すなわち液圧発生室1 1側に倒れる場合がある。この際、装着溝15における液圧発生室11側の側面 15aには、リップ20aに対応する部分にテーパ面15a′が設けられている ので、正常姿勢にあるリップ20aが前倒れ状態となったとしてもテーパ面15 a′に当接することが極力回避される。しかも複数の補給溝23〜25がテーパ 面15a′の小径端よりも深くしてガイド部12の外周に設けられているので、 リップ20aがテーパ面15a′に当接したとしても、装着溝15の側面15a およびカップシール20間の空間は補給溝23〜25を介して液圧発生室11に 連通しており、前記空間が密閉状態となることはない。Next, the operation of this embodiment will be described. When the piston 10 is suddenly retracted in the direction in which the volume of the hydraulic pressure generating chamber 11 is increased, the lip 20a of the cup seal 20 is changed to the chain line in FIG. As shown by, there is a case in which it falls to the front, that is, to the hydraulic pressure generating chamber 11 side due to the front-back pressure difference. At this time, the side surface 15a of the mounting groove 15 on the hydraulic pressure generating chamber 11 side is provided with a taper surface 15a 'at a portion corresponding to the lip 20a, so that the lip 20a in a normal posture is tilted forward. However, contact with the tapered surface 15a 'is avoided as much as possible. Moreover, since the plurality of supply grooves 23 to 25 are provided on the outer periphery of the guide portion 12 so as to be deeper than the small diameter end of the tapered surface 15a ', even if the lip 20a contacts the tapered surface 15a', the mounting groove 15 The space between the side surface 15a and the cup seal 20 communicates with the hydraulic pressure generating chamber 11 through the replenishment grooves 23 to 25, and the space is not closed.

【0020】 さらにリップ20aテーパ面15a′に当接した状態で該リップ20aの外面 およびシリンダ穴8の内面間に形成される環状室は、複数の補給溝23〜25を 介して液圧発生室11に連通しており、前記環状室から液圧発生室11側への作 動液の流れが抑制されることはなく、該環状室の作動液がリップ20aの復帰動 作を抑制することはない。Further, the annular chamber formed between the outer surface of the lip 20a and the inner surface of the cylinder hole 8 in contact with the tapered surface 15a 'of the lip 20a is a hydraulic pressure generating chamber through a plurality of replenishment grooves 23 to 25. 11, the working fluid from the annular chamber to the hydraulic pressure generating chamber 11 side is not suppressed, and the working fluid in the annular chamber does not suppress the return operation of the lip 20a. Absent.

【0021】 したがって液圧発生室11の容積を増大する方向へのピストン10の移動が終 了したときには、リップ20aはシリンダ穴8の内面に摺接する側に直ちに復帰 するものであり、液圧発生室11の容積を減少させる方向へのピストン10の前 進作動が開始されるときまで、リップ20aが前倒れ状態のままとなることが防 止され、シール性を維持することが可能となる。Therefore, when the movement of the piston 10 in the direction of increasing the volume of the hydraulic pressure generating chamber 11 is completed, the lip 20a immediately returns to the side in which it is in sliding contact with the inner surface of the cylinder hole 8, and the hydraulic pressure is generated. Until the forward movement of the piston 10 in the direction of decreasing the volume of the chamber 11 is started, the lip 20a is prevented from remaining in the forward tilted state, and the sealing performance can be maintained.

【0022】 しかも補給溝23〜25は、ピストン10の鋳造時に形成されるものであるの で、鋳造後に連通孔を穿孔加工していた従来のものに比べると、加工工数が少な くてすむ。Moreover, since the replenishment grooves 23 to 25 are formed when the piston 10 is cast, the number of working steps is smaller than that of the conventional one in which the communication hole is bored after casting.

【0023】 図5ないし図7は本考案を自動車のブレーキ装置用タンデム型マスタシリンダ に適用したときの実施例を示すものであり、図5はタンデム型マスタシリンダの 縦断側面図、図6図は図5の6部拡大図、図7は図5の7−7線拡大断面図であ る。FIGS. 5 to 7 show an embodiment in which the present invention is applied to a tandem master cylinder for a vehicle brake device. FIG. 5 is a vertical side view of the tandem master cylinder, and FIG. 6 is an enlarged view of part 6 in FIG. 5, and FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG.

【0024】 先ず図5において、自動車のブレーキ装置用タンデム型マスタシリンダMB は 、シリンダ体43を備え、このシリンダ体43に設けられる有底のシリンダ穴4 4には、一対の前部ピストン45および後部ピストン46が摺動自在に嵌合され 、シリンダ穴44の閉塞端および前部ピストン45間には前部液圧発生室47が 形成され、また両ピストン45,46間には後部液圧発生室48がそれぞれ形成 される。而して両液圧発生室47,48は自動車における二系統のブレーキ油圧 回路に接続される。しかも両ピストン45,46は戻しばね49,50により後 退位置にそれぞれ付勢され、後部ピストン46の後端部には負圧ブースタBの出 力杆51が連接される。[0024] First, in FIG. 5, the brake device tandem master cylinder M B for an automobile, includes a cylinder body 43, the bottom cylinder bore 4 4 provided in the cylinder body 43, a pair of the front piston 45 And the rear piston 46 are slidably fitted, a front hydraulic pressure generating chamber 47 is formed between the closed end of the cylinder hole 44 and the front piston 45, and a rear hydraulic pressure is provided between the pistons 45 and 46. Generation chambers 48 are respectively formed. Thus, both hydraulic pressure generating chambers 47 and 48 are connected to two systems of brake hydraulic circuits in the automobile. Moreover, the pistons 45, 46 are biased to the rearward retracted positions by the return springs 49, 50, respectively, and the output rod 51 of the negative pressure booster B is connected to the rear end portion of the rear piston 46.

【0025】 シリンダ体43の上部に一体に突設される円筒状の油溜52と、該油溜52の 外周に下端部を嵌合・連結させる合成樹脂製のリザーバ本体53とでリザーバ5 4が構成され、油溜52内は、シリンダ体43と一体の隔壁55により前部油溜 室56および後部油溜室57に区画される。而して前部油溜室56は前部ピスト ン45の直上に配置されるものであり、その底壁には、前部油圧室47のリリー フポート58およびサプライポート59が穿設される。A cylindrical oil reservoir 52 integrally provided on the upper portion of the cylinder body 43, and a reservoir main body 53 made of synthetic resin for fitting and connecting the lower end portion to the outer periphery of the oil reservoir 52 are used as the reservoir 54. The interior of the oil sump 52 is partitioned into a front oil sump chamber 56 and a rear oil sump chamber 57 by a partition wall 55 that is integral with the cylinder body 43. Thus, the front oil reservoir chamber 56 is arranged directly above the front piston 45, and the relief port 58 and the supply port 59 of the front hydraulic chamber 47 are formed in the bottom wall thereof.

【0026】 一方、シリンダ体43の上部後方には、油溜52に続く厚肉側壁43aが設け られており、この側壁43aには、内端を後部油溜室57に連通させる連通路6 0が設けられる。また後部液圧発生室48のリリーフポート61およびサプライ ポート62が連通路60に十字状に交わるようにして側壁43aに穿設されてい る。On the other hand, behind the upper part of the cylinder body 43, a thick side wall 43a is provided which continues to the oil reservoir 52, and the side wall 43a has a communication passage 60 for communicating the inner end with the rear oil reservoir chamber 57. Is provided. Further, the relief port 61 and the supply port 62 of the rear hydraulic pressure generating chamber 48 are formed in the side wall 43a so as to intersect the communication passage 60 in a cross shape.

【0027】 ところで、前部ピストン45は鋳造されるものであり、この前部ピストン45 には、シリンダ穴44に摺接するガイド部63,64が相互間に環状凹部65を 介在させて設けられる。而して前部ピストン45の前部外周には、シリンダ穴4 4の内面に摺接するカップシール66がガイド部63で受けるようにして装着さ れる。またガイド部64には環状の装着溝68が設けられており、シリンダ穴4 4の内面に摺接するカップシール67が装着溝68に装着される。By the way, the front piston 45 is cast, and the front piston 45 is provided with guide portions 63 and 64 slidably contacting the cylinder hole 44 with an annular recess 65 interposed therebetween. A cup seal 66, which is in sliding contact with the inner surface of the cylinder hole 44, is attached to the outer periphery of the front portion of the front piston 45 so as to be received by the guide portion 63. Further, the guide portion 64 is provided with an annular mounting groove 68, and the cup seal 67 which is in sliding contact with the inner surface of the cylinder hole 44 is mounted in the mounting groove 68.

【0028】 図6および図7において、装着溝68は、相互に対向する一対の側面68a, 68bと、それらの側面68a,68b間を連結する底面68cとで形成される 。しかも両側面68a,68bのうち、後部液圧発生室48側に在る側面68a の周縁部には、後部液圧発生室48側に向かうにつれて大径となるテーパ面68 a′が設けられる。6 and 7, the mounting groove 68 is formed by a pair of side surfaces 68a and 68b facing each other and a bottom surface 68c connecting the side surfaces 68a and 68b. In addition, a tapered surface 68 a ′ having a diameter increasing toward the rear hydraulic pressure generating chamber 48 side is provided at the peripheral edge of the side surface 68 a on the rear hydraulic pressure generating chamber 48 side of the both side surfaces 68 a, 68 b.

【0029】 またカップシール67は、シリンダ穴44の内面に弾発的に摺接するリップ6 7aを有して後部液圧発生室48側に開いた横断面略J字状に形成される。The cup seal 67 has a lip 67a that elastically comes into sliding contact with the inner surface of the cylinder hole 44, and is formed in a generally J-shaped cross section open to the rear hydraulic pressure generating chamber 48 side.

【0030】 さらに、前部ピストン45におけるガイド部64の外周には、一端を後部液圧 発生室48に連通させるとともに他端を前記側面68aに開口させる複数たとえ ば3つの補給溝69,70,71が周方向に等間隔をあけて設けられており、補 給溝70,71は、前部ピストン45の鋳造時に2つの鋳型の離型を可能とすべ く補給溝69とは異なる形状に形成される。Further, on the outer periphery of the guide portion 64 of the front piston 45, a plurality of, for example, three replenishment grooves 69, 70, whose one end communicates with the rear hydraulic pressure generating chamber 48 and whose other end is opened to the side surface 68 a, 71 are provided at equal intervals in the circumferential direction, and the supplemental grooves 70 and 71 are formed in a shape different from that of the supplemental groove 69 so that the two molds can be released from each other when the front piston 45 is cast. To be done.

【0031】 このような実施例においても、図1ないし図4の実施例と同様に、カップシー ル67のリップ67aのシリンダ穴44内面に摺接する方向の復帰動作を速やか にして、シール性を維持することが可能となり、さらに補給溝69〜71を前部 ピストン45の鋳造時に形成することにより、加工工数の低減を図ることができ る。In such an embodiment as well, similar to the embodiment shown in FIGS. 1 to 4, the return operation of the lip 67a of the cup seal 67 in the direction of sliding contact with the inner surface of the cylinder hole 44 is swift, and the sealing property is improved. It is possible to maintain it, and further, by forming the replenishment grooves 69 to 71 during casting of the front piston 45, it is possible to reduce the number of processing steps.

【0032】[0032]

【考案の効果】[Effect of the device]

以上のように本考案の第1の特徴によれば、ピストンの外周には、一端を液圧 発生室に連通させるとともに他端を装着溝に開口させる複数の補給溝が設けられ るので、部品点数の増加を回避しながら、カップシールのリップが速やかに復帰 するようにしてシール性を維持することができる。 As described above, according to the first feature of the present invention, the outer periphery of the piston is provided with a plurality of supply grooves, one end of which communicates with the hydraulic pressure generating chamber and the other end of which opens into the mounting groove. While avoiding an increase in the number of points, the lip of the cup seal can be quickly restored to maintain the sealing property.

【0033】 また本考案の第2の特徴によれば、装着溝の相互に対向する側面のうち液圧発 生室側の側面周縁部には、液圧発生室側に向かうにつれて大径となるテーパ面が 設けられるので、カップシールのリップが倒れても装着溝の液圧発生室側の側面 に当接することが極力回避される。Further, according to the second feature of the present invention, of the side surfaces of the mounting groove that face each other, the peripheral edge of the side surface on the hydraulic pressure generating chamber side has a larger diameter toward the hydraulic pressure generating chamber side. Since the tapered surface is provided, even if the lip of the cup seal falls down, contact with the side surface of the mounting groove on the hydraulic pressure generating chamber side is avoided as much as possible.

【図面の簡単な説明】[Brief description of drawings]

【図1】クラッチ作動装置用マスタシリンダの縦断側面
図である。
FIG. 1 is a vertical sectional side view of a master cylinder for a clutch operating device.

【図2】ピストンの拡大縦断面図である。FIG. 2 is an enlarged vertical sectional view of a piston.

【図3】図1の3部拡大図である。FIG. 3 is an enlarged view of part 3 of FIG.

【図4】図2の4矢視正面図である。FIG. 4 is a front view taken along the arrow 4 of FIG.

【図5】ブレーキ装置用タンデム型マスタシリンダの縦
断側面図である。
FIG. 5 is a vertical sectional side view of a tandem master cylinder for a brake device.

【図6】図5の6部拡大図である。6 is an enlarged view of part 6 of FIG.

【図7】図5の7−7線拡大断面図である。7 is an enlarged sectional view taken along line 7-7 of FIG.

【図8】従来技術の断面図である。FIG. 8 is a cross-sectional view of a conventional technique.

【符号の説明】[Explanation of symbols]

8,43 シリンダ体 10,45 ピストン 11,48 液圧発生室 15,68 装着溝 15a,68a 側面 15a′,68a′ テーパ面 20,67 カップシール 20a,67a リップ 23〜25,69〜71 補給溝 MB ,MC マスタシリンダ8,43 Cylinder body 10,45 Piston 11,48 Hydraulic pressure generating chamber 15,68 Mounting groove 15a, 68a Side surface 15a ', 68a' Tapered surface 20,67 Cup seal 20a, 67a Lip 23-25, 69-71 Supply groove M B , M C master cylinder

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 ピストン(10,45)がその一端を液
圧発生室(11,48)に臨ませてシリンダ体(8,4
3)内に摺動自在に嵌合され、ピストン(10,45)
の外周に設けられる装着溝(15,68)には、シリン
ダ体(8,43)内面に摺接するリップ(20a,67
a)を有して液圧発生室(11,48)側に開いた横断
面略J字状のカップシール(20,67)が装着される
マスタシリンダにおいて、ピストン(10,45)の外
周には、一端を液圧発生室(11,48)に連通させる
とともに他端を前記装着溝(15,68)に開口させる
複数の補給溝(23,24,25;69,70,71)
が設けられることを特徴とするマスタシリンダ。
1. A cylinder body (8, 4) with a piston (10, 45) having one end thereof facing the hydraulic pressure generating chamber (11, 48).
3) Slidably fitted in the piston (10, 45)
In the mounting grooves (15, 68) provided on the outer periphery of the lip (20a, 67) that are in sliding contact with the inner surface of the cylinder body (8, 43).
In a master cylinder in which a cup seal (20, 67) having a cross section and having a substantially J-shape opened to the hydraulic pressure generating chamber (11, 48) side having a) is mounted, the master cylinder is provided on the outer periphery of the piston (10, 45). Is a plurality of replenishment grooves (23, 24, 25; 69, 70, 71) having one end communicating with the hydraulic pressure generation chambers (11, 48) and the other end opened to the mounting grooves (15, 68).
A master cylinder characterized by being provided with.
【請求項2】 前記装着溝(15,68)の相互に対向
する側面(15a,15b;68a,68b)のうち液
圧発生室(11,48)側の側面(15a,68a)周
縁部には、液圧発生室(11,48)側に向かうにつれ
て大径となるテーパ面(15a′,67a′)が設けら
れることを特徴とする請求項1記載のマスタシリンダ。
2. A peripheral edge of a side surface (15a, 68a) of the mounting groove (15, 68) on the hydraulic pressure generating chamber (11, 48) side of the side surfaces (15a, 15b; 68a, 68b) facing each other. 2. The master cylinder according to claim 1, wherein the master cylinder is provided with a tapered surface (15a ', 67a') having a diameter increasing toward the hydraulic pressure generating chamber (11, 48) side.
JP1991078355U 1991-09-27 1991-09-27 Master cylinder Expired - Lifetime JP2529292Y2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1991078355U JP2529292Y2 (en) 1991-09-27 1991-09-27 Master cylinder
KR92000299U KR960003502Y1 (en) 1991-09-27 1992-01-11 Master cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1991078355U JP2529292Y2 (en) 1991-09-27 1991-09-27 Master cylinder

Publications (2)

Publication Number Publication Date
JPH0528775U true JPH0528775U (en) 1993-04-16
JP2529292Y2 JP2529292Y2 (en) 1997-03-19

Family

ID=13659686

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1991078355U Expired - Lifetime JP2529292Y2 (en) 1991-09-27 1991-09-27 Master cylinder

Country Status (2)

Country Link
JP (1) JP2529292Y2 (en)
KR (1) KR960003502Y1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009056922A (en) * 2007-08-31 2009-03-19 Bosch Corp Cup seal, and master cylinder using this
JP2011240723A (en) * 2010-05-14 2011-12-01 Bosch Corp Master cylinder and brake system using the same
JP2013237370A (en) * 2012-05-16 2013-11-28 Nissin Kogyo Co Ltd Cylinder device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6237797U (en) * 1985-08-26 1987-03-06

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6237797U (en) * 1985-08-26 1987-03-06

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009056922A (en) * 2007-08-31 2009-03-19 Bosch Corp Cup seal, and master cylinder using this
JP2011240723A (en) * 2010-05-14 2011-12-01 Bosch Corp Master cylinder and brake system using the same
JP2013237370A (en) * 2012-05-16 2013-11-28 Nissin Kogyo Co Ltd Cylinder device

Also Published As

Publication number Publication date
KR930006977U (en) 1993-04-24
KR960003502Y1 (en) 1996-04-24
JP2529292Y2 (en) 1997-03-19

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