JP5829197B2 - Manufacturing method of hydraulic master cylinder - Google Patents

Manufacturing method of hydraulic master cylinder Download PDF

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JP5829197B2
JP5829197B2 JP2012213456A JP2012213456A JP5829197B2 JP 5829197 B2 JP5829197 B2 JP 5829197B2 JP 2012213456 A JP2012213456 A JP 2012213456A JP 2012213456 A JP2012213456 A JP 2012213456A JP 5829197 B2 JP5829197 B2 JP 5829197B2
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storage chamber
liquid storage
cylinder
forming core
cylinder hole
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小林　太
太 小林
康彦 渡辺
康彦 渡辺
波多腰　弦一
弦一 波多腰
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Nissin Kogyo Co Ltd
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Description

本発明は、液圧マスタシリンダの製造方法に係り、詳しくは、ダイカスト鋳造にて形成される、シリンダ本体にリザーバを一体に備えた液圧マスタシリンダの製造方法に関する。 The present invention relates to the production how the hydraulic pressure master cylinder, and more particularly, is formed by die casting, relates to the production how the hydraulic pressure master cylinder with integral reservoir to the cylinder body.

従来、金型内に溶湯金属を高圧で注入して成形する、ダイカスト鋳造にて液圧マスタシリンダを形成するものがあった（例えば、特許文献１参照。）。   Conventionally, there has been a technique in which a hydraulic master cylinder is formed by die casting, in which a molten metal is injected into a mold at a high pressure (see, for example, Patent Document 1).

特開２００３−６２６４２号公報JP 2003-62642 A

しかし、上述の特許文献１のように、シリンダ孔を備えたシリンダ本体に、貯液室を備えたリザーバを一体に備えた液圧マスタシリンダを、シリンダ孔形成中子と貯液室形成中子とを使用してダイカスト鋳造にて形成するものでは、鋳造時に、高圧で湯口から注入される溶湯金属が、シリンダ孔形成中子や貯液室形成中子にぶつかると、乱流となり気泡が発生し、残留することがあり、鋳造体の強度及び内部品質が低下する虞があった。   However, as in Patent Document 1 described above, a hydraulic master cylinder that is integrally provided with a reservoir provided with a liquid storage chamber in a cylinder body provided with a cylinder hole is provided with a cylinder hole forming core and a liquid storage chamber forming core. In the case of forming by die casting using and, when the molten metal injected from the gate at high pressure hits the cylinder hole forming core or the liquid chamber forming core during casting, bubbles are generated and become turbulent However, it may remain, and the strength and internal quality of the cast body may be deteriorated.

そこで本発明は、鋳造時に溶湯金属の乱流を防止し、製品内部に気泡を極力発生、残留させないダイカスト鋳造による液圧マスタシリンダの製造方法を提供することを目的としている。 The present invention prevents the turbulence of the melt metal during casting, as much as possible generating bubbles inside the product, it is an object to provide a manufacturing how the hydraulic pressure master cylinder by die casting which does not remain.

上記目的を達成するため、本発明の液圧マスタシリンダの製造方法は、シリンダ孔を設けたシリンダ本体の上部に、貯液室を設けたリザーバを一体に形成した液圧マスタシリンダを、前記シリンダ本体の外形に対応する外型とシリンダ孔形成中子と貯液室形成中子とを用いた成形型を使用してダイカスト鋳造にて形成する液圧マスタシリンダの製造方法において、前記シリンダ孔形成中子と前記貯液室形成中子とを、シリンダ孔形成位置と貯液室形成位置との間に、前記貯液室の底面と前記シリンダ孔の周面とを区画する中間壁部を形成するための空隙部を存して配置し、前記成形型に溶湯を注入する湯口は、該湯口の貯液室側端面を前記貯液室の底面を形成する前記貯液室形成中子の先端面と同一平面上に形成し、前記湯口から前記空隙部に注入された溶湯は、前記貯液室形成中子と前記シリンダ孔形成中子とに直接ぶつかることなく、前記シリンダ孔の軸心方向を横切る方向に、前記貯液室形成中子の先端面とシリンダ孔形成中子の周面との間を流れて、前記成形型内に充填されることにより前記液圧マスタシリンダを鋳造することを特徴としている。 In order to achieve the above object, a method for manufacturing a hydraulic master cylinder according to the present invention includes a hydraulic master cylinder in which a reservoir provided with a liquid storage chamber is integrally formed on an upper portion of a cylinder body provided with a cylinder hole. In the manufacturing method of a hydraulic master cylinder formed by die casting using a mold using an outer mold corresponding to the outer shape of the main body, a cylinder hole forming core, and a liquid storage chamber forming core, the cylinder hole formation An intermediate wall portion that divides the bottom surface of the liquid storage chamber and the peripheral surface of the cylinder hole is formed between the core and the liquid storage chamber forming core between the cylinder hole forming position and the liquid storage chamber forming position. A pouring gate that is arranged with a gap portion for injecting the molten metal into the mold is formed at the end of the liquid storage chamber forming core that forms the bottom surface of the liquid storage chamber on the liquid storage chamber side end surface of the pouring gate. Formed on the same plane as the surface, the gap from the gate The injected molten metal does not directly collide with the liquid storage chamber forming core and the cylinder hole forming core, and in a direction crossing the axial center direction of the cylinder hole, flows between the peripheral surface of the cylinder bore forming cores, Ru Tei characterized by casting said hydraulic master cylinder by being filled into the mold.

本発明の液圧マスタシリンダの製造方法によれば、シリンダ孔形成中子と貯液室形成中子の中間位置に湯口を設け、該湯口から溶湯金属を成形型内に注入して、液圧マスタシリンダをダイカスト鋳造することにより、溶湯金属が中子に衝突して乱流を発生させることがない。これにより、乱流による気泡の製品内部への発生、残留を極力抑え、強度及び内部品質を確保した良好な液圧マスタシリンダを製造することができる。   According to the method for manufacturing a hydraulic master cylinder of the present invention, a pouring gate is provided at an intermediate position between the cylinder hole forming core and the liquid storage chamber forming core, and molten metal is injected into the mold from the pouring gate. By die casting the master cylinder, the molten metal does not collide with the core to generate turbulent flow. Thereby, generation | occurrence | production and the residue of the bubble by a turbulent flow inside a product are suppressed as much as possible, and the favorable hydraulic master cylinder which ensured intensity | strength and internal quality can be manufactured.

また、前記湯口の貯液室上部側端面と、前記貯液室の底面とが同一平面上に形成されていることにより、貯液室形成中子の底面に沿って溶湯金属を流すことができることから、さらに乱流の発生を抑制することができる。   In addition, since the upper end surface of the liquid storage chamber of the gate and the bottom surface of the liquid storage chamber are formed on the same plane, the molten metal can flow along the bottom surface of the storage chamber forming core. Therefore, generation of turbulent flow can be further suppressed.

本発明の一形態例を示す液圧マスタシリンダの説明図である。It is explanatory drawing of the hydraulic master cylinder which shows one example of this invention. 同じく液圧マスタシリンダの背面図である。It is a rear view of a hydraulic master cylinder similarly. 同じく液圧マスタシリンダの正面図である。It is a front view of a hydraulic master cylinder similarly. 同じく液圧マスタシリンダ鋳造時の説明図である。It is explanatory drawing similarly at the time of hydraulic master cylinder casting. 図１のV−V断面図である。It is VV sectional drawing of FIG. 図７のVI−VI断面図である。It is VI-VI sectional drawing of FIG. 同じく液圧マスタシリンダをハンドルバーに取り付けた状態を示す平面図である。It is a top view which shows the state which similarly attached the hydraulic master cylinder to the handlebar.

図１乃至図７は、本発明の一形態例を示すもので、液圧マスタシリンダ１は、シリンダ本体２の上部にリザーバ３を一体に備えたリザーバ一体型で、シリンダ本体２には、車体取付ブラケット２ａと、レバーブラケット２ｂとが一体にそれぞれ設けられている。液圧マスタシリンダ１は、車体取付ブラケット２ａと、別途のホルダ４とでハンドルバー５を保持し、ボルト６，６を締結することにより、車体に取り付けられ、レバーブラケット２ｂには、ピボット７によって操作レバー８が回動可能に取り付けられている。   1 to 7 show an embodiment of the present invention. A hydraulic master cylinder 1 is a reservoir-integrated type in which a reservoir 3 is integrally provided on an upper portion of a cylinder body 2, and the cylinder body 2 includes a vehicle body. The mounting bracket 2a and the lever bracket 2b are integrally provided. The hydraulic master cylinder 1 is attached to the vehicle body by holding the handlebar 5 with the vehicle body mounting bracket 2a and the separate holder 4 and fastening the bolts 6 and 6, and the lever bracket 2b is attached by the pivot 7 An operation lever 8 is rotatably attached.

シリンダ本体２の内部には、操作レバー８側に開口して有底のシリンダ孔２ｃが設けられ、リザーバ３の内部には貯液室３ａが設けられている。シリンダ孔２ｃと貯液室３ａとの間には、シリンダ孔２ｃと貯液室３ａとを区画する中間壁部１ａが形成され、該中間壁部１ａに、シリンダ孔２ｃと貯液室３ａとを連通させるリリーフポート９とサプライポート１０とが形成されている。シリンダ孔２ｃには、ピストン１１がカップシール１２ａ,１２ｂを介して内挿され、ピストン１１とシリンダ孔２ｃの底壁との間に液圧室１３が画成されている。ピストン１１とシリンダ孔２ｃの底壁との間には戻しばね１４が縮設され、該戻しばね１４の弾発力により、ピストン１１が開口側へ付勢される。また、シリンダ本体２の底壁には、ユニオンボス部２ｄが突設され、該ユニオンボス部２ｄにユニオン孔２ｅが前記液圧室１３に連通して設けられている。   Inside the cylinder body 2, a bottomed cylinder hole 2 c is provided that opens toward the operation lever 8, and a liquid storage chamber 3 a is provided inside the reservoir 3. An intermediate wall 1a that partitions the cylinder hole 2c and the liquid storage chamber 3a is formed between the cylinder hole 2c and the liquid storage chamber 3a. The cylinder hole 2c and the liquid storage chamber 3a are formed in the intermediate wall 1a. A relief port 9 and a supply port 10 are formed so as to communicate with each other. A piston 11 is inserted into the cylinder hole 2c via cup seals 12a and 12b, and a hydraulic chamber 13 is defined between the piston 11 and the bottom wall of the cylinder hole 2c. A return spring 14 is contracted between the piston 11 and the bottom wall of the cylinder hole 2c, and the piston 11 is urged toward the opening by the elastic force of the return spring 14. Further, a union boss portion 2 d is projected on the bottom wall of the cylinder body 2, and a union hole 2 e is provided in the union boss portion 2 d so as to communicate with the hydraulic pressure chamber 13.

上述のシリンダ本体２は、ダイカスト鋳造にて形成されるもので、図４に示されるように、シリンダ本体の外形に対応する外型２１，２１と、シリンダ孔形成中子２２と貯液室形成中子２３とを使用して形成される。シリンダ孔形成位置と貯液室形成位置の間に形成される中間壁部１ａの一側には、湯口Ｐ１が設けられると共に、中間壁部１ａの他側には、排出口Ｐ２が設けられる。湯口Ｐ１は、シリンダ孔形成中子２２と貯液室形成中子２３の中間位置に直線的に接続される方向に形成されると共に、湯口Ｐ１の貯液室上部側端面Ｐ１ａは、前記貯液室３ａの底面３ｂ（貯液室形成中子２３の底面２３ａ）とが同一平面Ｆ１上に形成され、湯口Ｐ１から例えば、アルミニウム合金等の溶湯金属が、高圧・高速で注入される。なお、図４に示される符号ＣＬ１は、シリンダ孔２ｃの軸心を示している。 The cylinder body 2 described above is formed by die casting. As shown in FIG. 4, the outer dies 21 and 21 corresponding to the outer shape of the cylinder body, the cylinder hole forming core 22 and the liquid storage chamber formation. It is formed using the core 23. A gate P1 is provided on one side of the intermediate wall 1a formed between the cylinder hole forming position and the liquid storage chamber forming position, and a discharge port P2 is provided on the other side of the intermediate wall 1a. The gate P1 is formed in a direction linearly connected to an intermediate position between the cylinder hole forming core 22 and the liquid storage chamber forming core 23, and the liquid storage chamber upper side end face P1a of the gate P1 The bottom surface 3b of the chamber 3a (the bottom surface 23a of the liquid storage chamber forming core 23) is formed on the same plane F1, and a molten metal such as an aluminum alloy is injected from the gate P1 at high pressure and high speed. In addition, the code | symbol CL1 shown by FIG. 4 has shown the axial center of the cylinder hole 2c .

湯口Ｐ１から注入された溶湯金属は、貯液室形成中子２３とシリンダ孔形成中子２２とに直接ぶつかることなく、貯液室形成中子２３との底面２３ａに沿って、該底面２３ａとシリンダ孔形成中子２２の周面２２ａの間を流れて型内に充填され、また、他の型内の空間部に溶湯金属を充填しながら、余剰分の溶湯金属が排出口Ｐ２から排出される。鋳造後の、湯口が切断された鋳造体には、シリンダ孔２ｃ，ユニオン孔２ｅ，リリーフポート９，サプライポート１０等が仕上げ加工され、液圧マスタシリンダ１が形成される。   The molten metal injected from the gate P1 does not directly collide with the liquid storage chamber forming core 23 and the cylinder hole forming core 22, but along the bottom surface 23a of the liquid storage chamber forming core 23, It flows between the peripheral surfaces 22a of the cylinder hole forming core 22 and is filled in the mold, and the surplus molten metal is discharged from the discharge port P2 while filling the space in the other mold with the molten metal. The After casting, the cast body with the gate cut is cut into the cylinder hole 2c, the union hole 2e, the relief port 9, the supply port 10, and the like, and the hydraulic master cylinder 1 is formed.

上述のように形成される液圧マスタシリンダ１は、鋳造時に、湯口Ｐ１から注入される溶湯金属が、シリンダ孔形成中子２２と貯液室形成中子２３とに衝突することがないことから、溶湯金属が乱流を発生することがない。これにより、乱流による気泡の発生、残留を極力抑えることができ、製品内部に気泡が少なく、強度を確保した良好な液圧マスタシリンダ１を製造することができる。   In the hydraulic master cylinder 1 formed as described above, the molten metal injected from the gate P1 does not collide with the cylinder hole forming core 22 and the liquid storage chamber forming core 23 during casting. The molten metal does not generate turbulent flow. Thereby, generation | occurrence | production and residual of the bubble by a turbulent flow can be suppressed as much as possible, and the favorable hydraulic master cylinder 1 with few bubbles inside a product and ensuring intensity | strength can be manufactured.

尚、本発明は上述の形態例に限るものではなく、湯口と排出口とを逆に設けることもできる。さらに、湯口の貯液室上部側端面は、貯液室の底面と同一平面上に形成されていなくても良い。また、液圧マスタシリンダはリザーバ一体型であれば、内部の構造は任意であり、縦型の液圧マスタシリンダにも適用することができる。   In addition, this invention is not restricted to the above-mentioned form example, A pouring gate and a discharge port can also be provided reversely. Furthermore, the end surface on the upper side of the liquid storage chamber of the gate may not be formed on the same plane as the bottom surface of the liquid storage chamber. Further, if the hydraulic master cylinder is a reservoir-integrated type, the internal structure is arbitrary, and it can be applied to a vertical hydraulic master cylinder.

１…液圧マスタシリンダ、１ａ…中間壁部、２…シリンダ本体、２ａ…車体取付ブラケット、２ｂ…レバーブラケット、２ｃ…シリンダ孔、２ｄ…ユニオンボス部、２ｅ…ユニオン孔、３…リザーバ、３ａ…貯液室、３ｂ…底面、４…ホルダ、５…ハンドルバー、６…ボルト、７…ピボット、８…操作レバー、９…リリーフポート、１０…サプライポート、１１…ピストン、１２ａ，１２ｂ…カップシール、１３…液圧室、１４…戻しばね、２１…外型、２２…シリンダ孔形成中子、２２ａ…周面、２３…貯液室形成中子、２３ａ…底面、Ｐ１…湯口、Ｐ２…排出口   DESCRIPTION OF SYMBOLS 1 ... Hydraulic master cylinder, 1a ... Intermediate wall part, 2 ... Cylinder body, 2a ... Car body mounting bracket, 2b ... Lever bracket, 2c ... Cylinder hole, 2d ... Union boss part, 2e ... Union hole, 3 ... Reservoir, 3a Liquid storage chamber, 3b ... Bottom, 4 ... Holder, 5 ... Handlebar, 6 ... Bolt, 7 ... Pivot, 8 ... Operation lever, 9 ... Relief port, 10 ... Supply port, 11 ... Piston, 12a, 12b ... Cup Seal, 13 ... Hydraulic chamber, 14 ... Return spring, 21 ... Outer mold, 22 ... Cylinder hole forming core, 22a ... Surface, 23 ... Liquid storage chamber forming core, 23a ... Bottom surface, P1 ... Kippo, P2 ... Vent

Claims (1)

シリンダ孔を設けたシリンダ本体の上部に、貯液室を設けたリザーバを一体に形成した液圧マスタシリンダを、前記シリンダ本体の外形に対応する外型とシリンダ孔形成中子と貯液室形成中子とを用いた成形型を使用してダイカスト鋳造にて形成する液圧マスタシリンダの製造方法において、
前記シリンダ孔形成中子と前記貯液室形成中子とを、シリンダ孔形成位置と貯液室形成位置との間に、前記貯液室の底面と前記シリンダ孔の周面とを区画する中間壁部を形成するための空隙部を存して配置し、
前記成形型に溶湯を注入する湯口は、該湯口の貯液室側端面を前記貯液室の底面を形成する前記貯液室形成中子の先端面と同一平面上に形成し、
前記湯口から前記空隙部に注入された溶湯は、前記貯液室形成中子と前記シリンダ孔形成中子とに直接ぶつかることなく、前記シリンダ孔の軸心方向を横切る方向に、前記貯液室形成中子の先端面とシリンダ孔形成中子の周面との間を流れて、前記成形型内に充填されることにより前記液圧マスタシリンダを鋳造することを特徴とする液圧マスタシリンダの製造方法。 A hydraulic master cylinder in which a reservoir provided with a liquid storage chamber is integrally formed on the upper part of the cylinder body provided with a cylinder hole, an outer mold corresponding to the outer shape of the cylinder body, a cylinder hole forming core, and a liquid storage chamber formed. In the manufacturing method of a hydraulic master cylinder formed by die casting using a mold using a core,
An intermediate for partitioning the bottom surface of the liquid storage chamber and the peripheral surface of the cylinder hole between the cylinder hole forming position and the liquid storage chamber forming position between the cylinder hole forming core and the liquid storage chamber forming core Arrange with a gap to form the wall,
The pouring gate for pouring the molten metal into the mold is formed on the same plane as the front end surface of the liquid storage chamber forming core that forms the liquid storage chamber side end surface of the pouring gate,
The molten metal injected from the gate into the gap portion does not directly collide with the liquid storage chamber forming core and the cylinder hole forming core, but in a direction crossing the axial direction of the cylinder hole. A hydraulic master cylinder characterized by casting the hydraulic master cylinder by flowing between a front end surface of a forming core and a peripheral surface of a cylinder hole forming core and filling the mold . Production method.
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