JPS60227964A - Production of piston - Google Patents

Production of piston

Info

Publication number
JPS60227964A
JPS60227964A JP8537184A JP8537184A JPS60227964A JP S60227964 A JPS60227964 A JP S60227964A JP 8537184 A JP8537184 A JP 8537184A JP 8537184 A JP8537184 A JP 8537184A JP S60227964 A JPS60227964 A JP S60227964A
Authority
JP
Japan
Prior art keywords
piston
cavity
mold
cavities
struts
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
JP8537184A
Other languages
Japanese (ja)
Other versions
JPH07115154B2 (en
Inventor
Keiichiro Noguchi
野口 啓一郎
Takao Sugishita
杉下 隆雄
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP59085371A priority Critical patent/JPH07115154B2/en
Publication of JPS60227964A publication Critical patent/JPS60227964A/en
Publication of JPH07115154B2 publication Critical patent/JPH07115154B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/16Pistons  having cooling means
    • F02F3/20Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00Casting in, on, or around objects which form part of the product
    • B22D19/0009Cylinders, pistons
    • B22D19/0027Cylinders, pistons pistons

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

PURPOSE:To form easily cavities in the prescribed position of the inside of a piston member in casting of the piston having the cavities for cooling by providing the hollow members for forming the cavities to casting struts which suppress the diametral thermal expansion of the piston supported by a die. CONSTITUTION:The hollow members 2, 3, 4 for forming cavities are welded or fitted and fastened to the insert-casting struts 5, 6 which suppress the diametral thermal expansion of the piston supported by the die 8 and are thus disposed in the die 8. The cavities for cooling are extremely easily and exactly formed to the prescribed position in the piston member if the piston is cast in such a state.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、ピストンの製造方法、殊に冷却液を循環させ
るための冷却用空洞を内部に有するピストンの製造法に
関する。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a piston, and more particularly to a method for manufacturing a piston having a cooling cavity therein for circulating a cooling fluid.

(従来技術) たとえば直噴ディーセルエンジン用のピストンでは、ピ
ストンヘッド部に燃焼室が設けられており、ヘット部を
積極的に冷却する必要がある。このためピストン頂部付
近に空洞を設け、この空洞に潤滑油を通すことにより、
ピストン頂部を冷却するような構造が用いられている。
(Prior Art) For example, in a piston for a direct injection diesel engine, a combustion chamber is provided in the piston head, and it is necessary to actively cool the head. For this reason, by creating a cavity near the top of the piston and passing lubricating oil through this cavity,
A structure is used that cools the top of the piston.

このようなピストンを鋳造により製造する場合、空洞部
は中子を用いて形成するのが一般的であり、この中子を
金型に支持するのに細棒状の金属からなる支持部材が用
いられ、この支持部材は、実開昭56−39836号公
報の第1図に従来技術として示されているように、その
ままピストンに鋳込まれる。
When such a piston is manufactured by casting, the cavity is generally formed using a core, and a support member made of a thin rod-shaped metal is used to support the core in a mold. This support member is directly cast into the piston as shown in FIG. 1 of Japanese Utility Model Application Publication No. 56-39836 as a prior art.

この従来の方法は、金型から長く伸びた支持部材により
支持するため中子の支持を十分に安定させることができ
ない、という問題があり、かつ支持部材という不要な、
ものが内部に鋳込まれる点で好ましくない。そこで、上
述の実開昭56−39836号では、この冷却用空洞と
なる管部と、ピストンリングを嵌め込むためのリング溝
となるリングトレーガ一部とを一体に形成し、これをピ
ストンに鋳込んだ構造を提案している。しかし、冷却用
空洞はできる限りピストン頂面に寄せた位置に形成する
ことが望ましいのであるが、この提案された構造では冷
却用空洞の位置がリング溝の位置により制約を受けるこ
とになる。
This conventional method has the problem that the support of the core cannot be sufficiently stabilized because the core is supported by a long support member extending from the mold, and the support member is unnecessary.
This is undesirable because things are molded inside. Therefore, in the above-mentioned Japanese Utility Model Application Publication No. 56-39836, the pipe section that becomes the cooling cavity and a part of the ring trager that becomes the ring groove into which the piston ring is fitted are integrally formed, and this is attached to the piston. We are proposing a cast-in structure. However, although it is desirable to form the cooling cavity as close to the top surface of the piston as possible, in this proposed structure, the position of the cooling cavity is restricted by the position of the ring groove.

実開昭57−171147号公報には、冷却用空洞形成
のための中子をリング溝を形成する耐摩環により金型に
支持し、この耐摩環をそのままピストンに鋳込む構造が
提案されている。しかし、この構造も冷却用空洞の位置
が、リング溝の位置により制約を受ける、という点では
前述の構造のばあいと同様である。
Japanese Utility Model Application No. 57-171147 proposes a structure in which a core for forming a cooling cavity is supported in a mold by a wear-resistant ring forming a ring groove, and this wear-resistant ring is directly cast into a piston. . However, this structure is similar to the above structure in that the position of the cooling cavity is restricted by the position of the ring groove.

(発明の目的) 本発明は、冷却用空洞の位置について特に制約がなく、
また空洞形成部材の支持も確実に行なうことができるピ
ストンの製造法を提供することを目的とする。
(Object of the invention) The present invention has no particular restrictions on the position of the cooling cavity,
Another object of the present invention is to provide a method for manufacturing a piston that can reliably support the cavity forming member.

(発明の構成) 本発明の方法は、内部に冷却用空洞を有するとともに、
ピストンピン付近に径方向の熱膨張を抑制するストラッ
トが鋳込まれた形式のピストンの製造に適用されるもの
であって、冷却空洞形成のための中子あるいは鋳込用管
部材のような空洞形成部材をストラットにより支持した
状態で、このストラットを金型に支持し、該金型に溶湯
を注入してピストンの成形を行なうことからなる。空洞
形成部材は、ピストン頂面付近に位置するリング状部分
と、このリング状部分からピストンのスカート方向に延
びる、2本の、冷却液導入および排出用通路部分とから
なるのが一般的であり、そのばあいには、この通路部分
において該空洞形成部材をストラットにより支持するよ
うにすればよい。
(Structure of the Invention) The method of the present invention has a cooling cavity inside, and
It is applied to the manufacture of pistons in which struts are cast in the vicinity of the piston pin to suppress radial thermal expansion, and cavities such as cores or casting pipe members for forming cooling cavities are used. The piston is formed by supporting the forming member by a strut, supporting the strut in a mold, and pouring molten metal into the mold. The cavity forming member generally consists of a ring-shaped part located near the top surface of the piston, and two coolant introduction and discharge passage parts extending from this ring-shaped part toward the skirt of the piston. In that case, the cavity forming member may be supported by struts in this passage portion.

(発明の効果) 本発明においては、冷却用空洞をピストンに形成するた
めの空洞形成部材は、ピストンにもともと設けられてい
るストラットにより支持するようにしたので、空洞形成
部材支持のために特別の部材を必要とせず、しかも冷却
用空洞の位置に制約を受けることがない。
(Effects of the Invention) In the present invention, the cavity forming member for forming the cooling cavity in the piston is supported by the struts originally provided on the piston, so special support is provided to support the cavity forming member. No members are required, and there are no restrictions on the position of the cooling cavity.

(実施例の説明) 第1実施例(第1図ないし第5図) 第1図は本発明の方法により製造されたピストンの一例
を示すもので、ピストン1は頂面1aの付近に鋳込まれ
たリング状の中空管2と、該中空管2に接続され、ピス
トンのスカート方向に延びる2本の管3.4とを有し、
これら管2.3.4により冷却用空洞が形成される。ま
た、ピストン1のピストンピン取付穴1bの付近には、
ピストンピンの径方向の熱膨張を抑制するため、スチー
ル製のストラット5.6が配置されている。本例におい
ては、第5図に示すように、ストラット5.6は、管3
.4にそれぞれ溶接により固定されている。
(Description of Examples) First Example (Figures 1 to 5) Figure 1 shows an example of a piston manufactured by the method of the present invention. It has a ring-shaped hollow tube 2 and two tubes 3.4 connected to the hollow tube 2 and extending in the direction of the skirt of the piston,
These tubes 2.3.4 form a cooling cavity. In addition, near the piston pin mounting hole 1b of the piston 1,
Steel struts 5.6 are arranged to suppress radial thermal expansion of the piston pin. In this example, as shown in FIG.
.. 4 by welding.

このピストンの製造にさいしては、まず第5図に示すよ
うに、リング状の中空管2と冷却液の導入部および排出
部となる管3.4とを溶接して製造した空洞形成部材に
、ストラット5.6を、それぞれ管3.4の適当な位置
において溶接して固定して組立体7を形成する。このよ
うにして形成された管2.3.4とストラット5.6と
からなる組立体7を、上型8と下型9とからなる金型内
に配置する。上型8は、ピストン鋳造用の空所10を有
し、この空所1oは円筒形の壁面10aと、上方から該
空所10内に突出する突出部1゜bとにより形成されて
いる。上型8の空所1oは下端が開口しており、この開
口は下型9により閉じられる。下型9には、上型8の空
所1oに通じる湯道11が形成されており、この湯道1
1には押湯用のピストン12が配置されている。上型8
の突起10bは、ピストンに所要の内面形状を与え1尋
るような形状に製作されており、内部には第4図に示す
ように、ストラット5.6を保持するための磁石13が
埋め込まれている。
In manufacturing this piston, first, as shown in FIG. 5, a cavity forming member is manufactured by welding a ring-shaped hollow tube 2 and a tube 3.4 that will serve as the introduction and discharge portions of the coolant. Then, the struts 5.6 are each welded and fixed in place on the tube 3.4 to form the assembly 7. The assembly 7 consisting of the tube 2.3.4 and the strut 5.6 thus formed is placed in a mold consisting of an upper mold 8 and a lower mold 9. The upper mold 8 has a cavity 10 for casting the piston, and this cavity 1o is formed by a cylindrical wall surface 10a and a protrusion 1°b that projects into the cavity 10 from above. The cavity 1o of the upper mold 8 is open at the lower end, and this opening is closed by the lower mold 9. A runner 11 communicating with the cavity 1o of the upper mold 8 is formed in the lower mold 9, and this runner 1
A piston 12 for a riser is arranged at 1. Upper mold 8
The protrusion 10b is made to have a shape that gives the piston the required inner surface shape, and a magnet 13 for holding the strut 5.6 is embedded inside as shown in FIG. ing.

このように形成された金型を用い、ストラット5.6を
上型8の突起10b上に磁石13により保持する。これ
により、ストラット5.6に溶接された管3.4および
リング状の中空管2も空所10内に支持される。この状
態で湯道11から溶湯を注入し鋳造を行なう。本例の方
法においては、管2.3.4からなる空洞形成部材は、
そのまま製品の中に鋳込まれる。
Using the mold thus formed, the struts 5.6 are held on the projections 10b of the upper mold 8 by the magnets 13. Thereby, the tube 3.4 welded to the strut 5.6 and the ring-shaped hollow tube 2 are also supported in the cavity 10. In this state, molten metal is poured from the runner 11 and casting is performed. In the method of this example, the cavity-forming member consisting of the tube 2.3.4 is
It is directly cast into the product.

第2実施例(第6図) 本例では、空洞形成部材14は塩中子などの可溶性中子
により形成される。この空洞形成部材14は、ピストン
の頂面付近にリング状の空洞を形成するためのリング部
14aと、このリング状空洞に通じる通路を形成するた
めの通路部14b114cとからなり、通路部14b、
14cにストラット15.16が固定される。このよう
にして形成された組立体は、前例におけると同様にして
金型内に支持され、鋳造が行なわれる。
Second Embodiment (FIG. 6) In this embodiment, the cavity forming member 14 is formed of a soluble core such as a salt core. This cavity forming member 14 consists of a ring part 14a for forming a ring-shaped cavity near the top surface of the piston, and a passage part 14b114c for forming a passage leading to this ring-shaped cavity.
Struts 15, 16 are fixed to 14c. The assembly thus formed is supported in a mold and cast as in the previous example.

第3実施例(第7図) 本例では、ストラット25.26が金属製でなく、炭素
繊維などの繊維成形体により形成されている。金型への
取付けにさいしては、成形体の弾力性を利用して、上型
の突出部に嵌合させ、弾性的に保持すればよい。その他
の点では前例と同様である。
Third Embodiment (FIG. 7) In this embodiment, the struts 25 and 26 are not made of metal but are formed of a fiber molded body such as carbon fiber. When attaching to the mold, the molded body may be fitted into the protrusion of the upper mold and held elastically by utilizing its elasticity. In other respects, it is the same as the previous example.

なお、上記第2および第3実施例において空洞形成部材
をストラットに支持させる工程は、ストラットを金型に
支持させる工程の前後どちらでも良い。
In addition, in the second and third embodiments, the step of supporting the cavity forming member on the strut may be performed either before or after the step of supporting the strut on the mold.

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

第1図は本発明の方法により製造されるピストンの一例
を示す斜視図、第2図は製造方法を示す金型の断面図、
第3図は第2図の■−■線断面図、第4図は第2図のT
V−IV線断面図、第5図は空洞形成部材とストラット
とからなる組立体を示す斜視図、第6図は他の実施例に
用いられる空洞形成部材の斜視図、第7図はさらに他の
実施例を示す第6図と同様な図である。 2・・・中空管、3.4・・・管、5.6・・・ストラ
ット、9・・・下型、10・・・空所、10b・・・突
出部。 第3図 第4図 第5rA 第6図 I武 第7図 ″)^
FIG. 1 is a perspective view showing an example of a piston manufactured by the method of the present invention, FIG. 2 is a sectional view of a mold showing the manufacturing method,
Figure 3 is a cross-sectional view taken along the line ■-■ in Figure 2, and Figure 4 is the T in Figure 2.
5 is a perspective view showing an assembly consisting of a cavity forming member and a strut, FIG. 6 is a perspective view of a cavity forming member used in another embodiment, and FIG. 7 is a perspective view showing another example. FIG. 6 is a diagram similar to FIG. 6 showing an embodiment of the present invention. 2...Hollow tube, 3.4...Pipe, 5.6...Strut, 9...Lower mold, 10...Vacancy, 10b...Protrusion part. Figure 3 Figure 4 Figure 5rA Figure 6 I Take Figure 7'')

Claims (1)

【特許請求の範囲】[Claims] 内部に冷却用空洞を有し、ピストンピン付近には径方向
の熱膨張を抑制するストラットが鋳込まれた形式のピス
トンの製造法であって、ストラットに空洞形成部材を支
持した状態で、このストラットを金型に支持し、前記金
型に溶湯を注入することからなるピストン製造法。
A method for manufacturing a piston that has a cooling cavity inside and a strut cast in the vicinity of the piston pin to suppress radial thermal expansion. A piston manufacturing method comprising supporting a strut in a mold and injecting molten metal into the mold.
JP59085371A 1984-04-27 1984-04-27 Piston manufacturing method Expired - Lifetime JPH07115154B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59085371A JPH07115154B2 (en) 1984-04-27 1984-04-27 Piston manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59085371A JPH07115154B2 (en) 1984-04-27 1984-04-27 Piston manufacturing method

Publications (2)

Publication Number Publication Date
JPS60227964A true JPS60227964A (en) 1985-11-13
JPH07115154B2 JPH07115154B2 (en) 1995-12-13

Family

ID=13856853

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59085371A Expired - Lifetime JPH07115154B2 (en) 1984-04-27 1984-04-27 Piston manufacturing method

Country Status (1)

Country Link
JP (1) JPH07115154B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6385362U (en) * 1986-11-25 1988-06-03
US4776075A (en) * 1986-06-27 1988-10-11 Aisin Seiki Kabushiki Kaisha Method for manufacturing piston of internal combustion engine
WO1994020241A1 (en) * 1993-03-05 1994-09-15 T & N Technology Limited Piston with cavity
US5408916A (en) * 1993-09-07 1995-04-25 Ford Motor Company Piston having a liner and method for manufacturing same
WO2007073719A1 (en) * 2005-12-21 2007-07-05 Mahle International Gmbh Piston for an internal combustion engine and method of producing it
US7406941B2 (en) 2004-07-21 2008-08-05 Federal - Mogul World Wide, Inc. One piece cast steel monobloc piston

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58130051U (en) * 1982-02-27 1983-09-02 厚木自動車部品株式会社 piston
JPS5956966A (en) * 1982-06-25 1984-04-02 エ−イ−・ピ−エルシ− Pressure casting of piston having piston crown part equippedwith crown insert member and cooling barrel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58130051U (en) * 1982-02-27 1983-09-02 厚木自動車部品株式会社 piston
JPS5956966A (en) * 1982-06-25 1984-04-02 エ−イ−・ピ−エルシ− Pressure casting of piston having piston crown part equippedwith crown insert member and cooling barrel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4776075A (en) * 1986-06-27 1988-10-11 Aisin Seiki Kabushiki Kaisha Method for manufacturing piston of internal combustion engine
JPS6385362U (en) * 1986-11-25 1988-06-03
WO1994020241A1 (en) * 1993-03-05 1994-09-15 T & N Technology Limited Piston with cavity
US5408916A (en) * 1993-09-07 1995-04-25 Ford Motor Company Piston having a liner and method for manufacturing same
US7406941B2 (en) 2004-07-21 2008-08-05 Federal - Mogul World Wide, Inc. One piece cast steel monobloc piston
WO2007073719A1 (en) * 2005-12-21 2007-07-05 Mahle International Gmbh Piston for an internal combustion engine and method of producing it
US7921555B2 (en) 2005-12-21 2011-04-12 Mahle International Gmbh Piston for an internal combustion engine and method for its production

Also Published As

Publication number Publication date
JPH07115154B2 (en) 1995-12-13

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