JPH07180605A - Piston and its manufacture - Google Patents
Piston and its manufactureInfo
- Publication number
- JPH07180605A JPH07180605A JP34619193A JP34619193A JPH07180605A JP H07180605 A JPH07180605 A JP H07180605A JP 34619193 A JP34619193 A JP 34619193A JP 34619193 A JP34619193 A JP 34619193A JP H07180605 A JPH07180605 A JP H07180605A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- combustion chamber
- cooling cavity
- top surface
- annular
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 71
- 238000002485 combustion reaction Methods 0.000 claims abstract description 38
- 238000005266 casting Methods 0.000 claims abstract description 12
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000003466 welding Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 150000003839 salts Chemical group 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
- F02B23/069—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets characterised by its eccentricity from the cylinder axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は燃焼室をピストン頂面
に有すると共に、冷却空洞をその内部に有するピストン
およびその製造方法に関し、特に内燃機関用アルミニウ
ム合金製ピストンに適用して最適である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston having a combustion chamber on the top surface of the piston and a cooling cavity therein, and a method for manufacturing the piston, and is most suitable for application to an aluminum alloy piston for an internal combustion engine.
【０００２】[0002]
【従来の技術】たとえば内燃機関用のピストンでは、最
近の高出力化に伴う熱負荷の増加や、燃焼温度の上昇に
伴うピストン受熱温度の上昇に対し、一般にその対応策
としてピストン内部に冷却空洞を設けかつこの冷却空洞
内に冷却オイルを循環させて、ピストン頭部を強制冷却
する方法が採用されている。2. Description of the Related Art For example, in a piston for an internal combustion engine, a cooling cavity is generally provided inside the piston as a countermeasure against the recent increase in heat load due to higher output and the rise in piston heat receiving temperature due to increase in combustion temperature. And a cooling oil is circulated in the cooling cavity to forcibly cool the piston head.
【０００３】[0003]
【発明が解決しようとする課題】ところで上記冷却空洞
は、たとえば可溶性中子を金型内に支持させた状態でピ
ストンの鋳造を行い、その凝固後に上記可溶性中子を溶
解除去して形成する。そしてこの場合、冷却空洞による
冷却効果を最大限に発揮させるには、この冷却空洞をピ
ストン頂部に設けた燃焼室やトップリング溝、あるいは
ピストン頂面にできるだけ接近させて設けるのがよい。By the way, the cooling cavity is formed, for example, by casting the piston while the soluble core is supported in the mold, and then melting and removing the soluble core after solidification. In this case, in order to maximize the cooling effect of the cooling cavity, it is preferable to provide the cooling cavity as close as possible to the combustion chamber or the top ring groove provided on the piston top or the piston top surface.
【０００４】しかしながら上記冷却空洞を上記燃焼室等
にできるだけ近付けようとすれば、前記可溶性中子が鋳
造時に、上記燃焼室等の位置に接近し過ぎて湯の廻りが
阻害され、その結果、鋳造欠陥を生じ易い。However, if the cooling cavity is to be brought as close as possible to the combustion chamber or the like, the soluble core is too close to the position of the combustion chamber or the like at the time of casting, and the rotation of the molten metal is obstructed. Defects are likely to occur.
【０００５】本発明はこのような問題点に鑑みてなされ
たものであり、上記鋳造欠陥が製造時に発生することな
く、しかも冷却空洞による冷却効果が最大限に発揮され
るピストンおよびその製造方法を提供するものである。The present invention has been made in view of the above problems, and provides a piston and a manufacturing method thereof in which the above-mentioned casting defect does not occur during manufacturing and the cooling effect by the cooling cavity is maximized. It is provided.
【０００６】[0006]
【課題を解決するための手段】本発明は、燃焼室をピス
トン頂面に有すると共に、冷却空洞をその内部に有する
ピストンにおいて、所定形状を付与されたピストン頂面
側の部分と、このピストン頂面側の部分に結合される環
状部材とによって、上記冷却空洞に連通される第２の冷
却空洞を上記燃焼室および／またはトップリング溝の近
傍に設けてピストンを構成した。DISCLOSURE OF THE INVENTION According to the present invention, in a piston having a combustion chamber on the piston top surface and a cooling cavity inside, a portion on the piston top surface side provided with a predetermined shape, and the piston top surface side. A second cooling cavity communicating with the cooling cavity is provided in the vicinity of the combustion chamber and / or the top ring groove by the annular member coupled to the surface side portion to form a piston.
【０００７】なお上記環状部材と、上記ピストン頂面側
の部分とが結合される面は、上記燃焼室外周の近傍と、
上記トップリング溝上方のピストン外周の近傍とに設け
られるのがよい。また上記ピストン頂面側の部分には、
上記燃焼室を囲繞する環状の段付き部や凹部を設けるの
がよい。The surface where the annular member and the portion on the piston top surface side are connected to each other is in the vicinity of the outer periphery of the combustion chamber,
It is preferable to be provided near the outer circumference of the piston above the top ring groove. Also, in the part on the top surface side of the piston,
It is preferable to provide an annular stepped portion or recess surrounding the combustion chamber.
【０００８】また本発明は上記ピストンの製造方法を、
燃焼室をその頂面に有しかつ冷却空洞をその内部に有す
るピストン主部を鋳造する段階と、上記燃焼室囲りの頂
面を環状に除去する段階と、上記冷却空洞に開口される
複数の透孔を上記除去された部分の底面に形成する段階
と、上記除去された部分を環状部材にて被い、この部材
の端面を上記燃焼室外周の近傍と、トップリング溝上方
の上記ピストン主部の外周近傍とにおいて上記ピストン
主部に結合させ、ピストンの内部に第２の冷却空洞を形
成する段階とにより構成した。The present invention also provides a method for manufacturing the above piston,
Casting a piston main part having a combustion chamber on its top surface and having a cooling cavity therein, removing the top surface of the combustion chamber enclosure in an annular shape, and opening a plurality of openings in the cooling cavity. Forming a through hole on the bottom surface of the removed portion, and covering the removed portion with an annular member, the end surface of this member near the outer periphery of the combustion chamber, and the piston above the top ring groove. And a step of forming a second cooling cavity inside the piston by connecting to the piston main portion in the vicinity of the outer periphery of the main portion.
【０００９】さらに本発明は上記ピストンの製造方法
を、燃焼室とこの燃焼室の外周縁よりも高さの低い環状
部分とをその頂面に有しかつ冷却空洞をその内部に有す
るピストン主部を鋳造する段階と、上記冷却空洞に開口
される複数の透孔を上記環状部分の底面に形成する段階
と、上記環状部分を環状部材にて被い、この部材の端面
を上記燃焼室外周の近傍と、トップリング溝上方の上記
ピストン主部外周近傍とにおいて上記ピストン主部に結
合させ、ピストンの内部に第２の冷却空洞を形成する段
階とにより構成した。Further, the present invention provides a method of manufacturing a piston, wherein a piston main portion having a combustion chamber and an annular portion having a height lower than an outer peripheral edge of the combustion chamber on its top surface and having a cooling cavity inside thereof. A step of casting, a step of forming a plurality of through holes opened in the cooling cavity on the bottom surface of the annular portion, and the annular portion is covered with an annular member, the end surface of this member of the outer periphery of the combustion chamber And a step of forming a second cooling cavity inside the piston by combining with the piston main portion in the vicinity and near the outer periphery of the piston main portion above the top ring groove.
【００１０】[0010]
【実施例】以下本発明を、内燃機関用アルミニウム合金
製ピストンに適用した実施例につき、図１〜４を参照し
ながら説明する。EXAMPLE An example in which the present invention is applied to an aluminum alloy piston for an internal combustion engine will be described below with reference to FIGS.
【００１１】図１に示すピストンには、その頂面１に燃
焼室２が設けられ、その外周面に複数のピストンリング
溝３が設けられている。なお上記ピストンリング溝３の
うち最上位のトップリング溝３ａは、ニレジスト鋳鉄か
ら成るリングトレーガ５で補強されている。The piston shown in FIG. 1 is provided with a combustion chamber 2 on its top surface 1 and a plurality of piston ring grooves 3 on its outer peripheral surface. The top ring groove 3a of the piston ring grooves 3 is reinforced by a ring trailer 5 made of Niresist cast iron.
【００１２】次に符号７はピストン内部に設けられた環
状の第１冷却空洞で、冷却オイル供給口９および冷却オ
イル排出口１０を介してピストンスカート部６の内側空
間と連通されている。またこの第１冷却空洞７はピスト
ン頂面１近傍に設けた環状の第２冷却空洞８に、複数の
透孔１３を介して連通されている。Next, reference numeral 7 is an annular first cooling cavity provided inside the piston, and communicates with the inner space of the piston skirt portion 6 via the cooling oil supply port 9 and the cooling oil discharge port 10. Further, the first cooling cavity 7 is connected to an annular second cooling cavity 8 provided near the piston top surface 1 through a plurality of through holes 13.
【００１３】ところでこの第２冷却空洞８は、ピストン
主部１５の鋳造時に設けられる第１冷却空洞７とは異
り、このピストン主部１５のピストン頂面１側の部分４
に設けられて第１冷却空洞７に透孔１３で連通された凹
部１２に、環状円板１４を結合させることによって得ら
れる。The second cooling cavity 8 is different from the first cooling cavity 7 provided when the piston main portion 15 is cast, and the portion 4 of the piston main portion 15 on the piston top surface 1 side is different from the first cooling cavity 7.
It is obtained by connecting the annular disk 14 to the recess 12 provided in the first cooling cavity 7 and communicating with the first cooling cavity 7 through the through hole 13.
【００１４】すなわち第１冷却空洞７は、金型内に可溶
性中子、例えば塩中子を配置して溶融アルミニウム合金
を注湯し、その凝固後に上記中子を溶解除去することに
よるか、あるいは環状パイプを使用し、その鋳包みによ
って得られる。なお冷却オイル供給口９および冷却オイ
ル排出口１０は、上記鋳造の際に、上記塩中子を金型中
に支持していた支持柱の跡を仕上げ加工して形成され
る。That is, the first cooling cavity 7 is formed by arranging a soluble core, for example, a salt core in a mold, pouring a molten aluminum alloy, and melting and removing the core after solidification, or It is obtained by casting using an annular pipe. The cooling oil supply port 9 and the cooling oil discharge port 10 are formed by finishing the marks of the supporting columns that supported the salt core in the mold during the casting.
【００１５】一方これに反して第２冷却空洞８は、先ず
上記ピストン主部１５を鋳造し、その後燃焼室２囲りを
旋削またはフライス加工して、高さがこの燃焼室２の周
縁よりも低い環状の段付き部１１と、この段付き部１１
内に設けられかつチャンネル断面を持つ環状凹部１２と
をピストン頂面側の部分４に図１に示すように形成し、
次いで上記ピストン主部１５と同材質でありかつ別に用
意された環状円板１４を上記段付き部１１に嵌着させて
上記環状凹部１２を被い、さらに環状円板１４の内側お
よび外側寄りの端面を燃焼室２およびピストン外周の近
傍で上記ピストン主部１５にそれぞれ結合させることに
よって得られる。なお上記結合は、電子ビーム溶接によ
ったが、ＴＩＧ溶接その他の溶接あるいはボルト結合で
あってもよい。また前記透孔１３は、ドリルかエンドミ
ルを使用して形成するが、前記鋳造の際に段付き部１１
と共に、あるいは段付き部１１および凹部１２と共に予
め形成されてもよい。On the other hand, in the second cooling cavity 8, on the other hand, the piston main portion 15 is first cast, and then the surroundings of the combustion chamber 2 are turned or milled to have a height higher than that of the peripheral edge of the combustion chamber 2. Low annular stepped part 11 and this stepped part 11
An annular recess 12 provided inside and having a channel cross section is formed in a portion 4 on the piston top surface side as shown in FIG.
Next, an annular disc 14 made of the same material as the piston main part 15 and prepared separately is fitted to the stepped portion 11 to cover the annular recess 12, and further to the inside and outside of the annular disc 14. It is obtained by joining the end faces to the piston main portion 15 in the vicinity of the combustion chamber 2 and the piston outer periphery, respectively. The above-mentioned connection is based on electron beam welding, but TIG welding or other welding or bolt connection may be used. The through hole 13 is formed by using a drill or an end mill, but the stepped portion 11 is formed during the casting.
It may be formed together with the stepped portion 11 and the recess 12.
【００１６】次に図２には、本発明の第２実施例を示
す。この実施例ではアングル断面を持つ環状部材１４′
が使用されている。したがって同図から明らかなよう
に、この例では第１実施例の凹部１２を予め形成する必
要がなくなる。なおその他の点については第１実施例の
場合と同様である。Next, FIG. 2 shows a second embodiment of the present invention. In this embodiment, an annular member 14 'having an angled cross section
Is used. Therefore, as is apparent from the figure, in this example, it is not necessary to previously form the recess 12 of the first embodiment. The other points are the same as in the case of the first embodiment.
【００１７】次に図３および４には本発明の第３実施例
を示す。この場合には、燃焼室２がピストン中心軸に対
して偏心しているから、凹部１２は図４に示す様な形状
になる。なお図では、その内周線が外周線に対して偏心
した偏心環状円板１４″を使用しているが、第２実施例
の場合と同様に、円板ではなくアングル断面を持つ環状
部材を使用することもできる。なおこの種のピストン
は、ディーゼル機関にしばしば使用される。Next, FIGS. 3 and 4 show a third embodiment of the present invention. In this case, since the combustion chamber 2 is eccentric with respect to the piston central axis, the recess 12 has a shape as shown in FIG. In the drawing, an eccentric annular disc 14 ″ whose inner peripheral line is eccentric with respect to the outer peripheral line is used. However, as in the case of the second embodiment, an annular member having an angled cross section is used instead of the disc. It can also be used, although pistons of this kind are often used in diesel engines.
【００１８】次に上記ピストンの作用を述べれば、内燃
機関の稼動中に、冷却オイル供給口９がオイルジェット
（図示省略）からの冷却オイルの噴流を受けて、この冷
却オイルを第１冷却空洞７内に供給する。次いでこの供
給された冷却オイルは第１冷却空洞７の周囲を冷却し、
その後冷却オイル排出口１０を経てピストンスカート部
６の内側空間に排出される。Next, the operation of the piston will be described. During operation of the internal combustion engine, the cooling oil supply port 9 receives a jet of cooling oil from an oil jet (not shown), and the cooling oil is supplied to the first cooling cavity. Supply within 7. This supplied cooling oil then cools around the first cooling cavity 7,
Then, the oil is discharged to the inner space of the piston skirt portion 6 through the cooling oil discharge port 10.
【００１９】また第１冷却空洞７に供給された上記冷却
オイルの一部は、ピストンの往復動により透孔１３を経
て第２冷却空洞８に送られ、この第２冷却空洞８の周囲
を冷却したあと、再び透孔１３を経て第１冷却空洞７に
戻される。なおこの場合、上記透孔１３は少くとも２つ
以上設けられているから、上記冷却オイルの第２冷却空
洞８への給排はスムーズに行われる。またピストンは、
上述した冷却オイルの循環によって有効に冷却されるた
め、ピストンの熱亀裂、焼付き、カーボンの生成、リン
グスティック等の不都合が回避される。A part of the cooling oil supplied to the first cooling cavity 7 is sent to the second cooling cavity 8 through the through hole 13 by the reciprocating motion of the piston and cools the periphery of the second cooling cavity 8. After that, it is returned to the first cooling cavity 7 through the through hole 13 again. In this case, since the at least two through holes 13 are provided, the cooling oil can be smoothly supplied to and discharged from the second cooling cavity 8. Also, the piston is
Since the cooling oil is effectively cooled by the circulation of the cooling oil described above, inconveniences such as thermal cracks, seizure of the piston, generation of carbon, and ring stick are avoided.
【００２０】以上本発明の実施例について述べたが、本
発明は上記実施例の範囲に限定されることなく、種々の
変更が可能である。たとえばこの発明はアルミニウム合
金製以外のピストン、たとえば鋳鉄製ピストンにも適用
が可能である。Although the embodiments of the present invention have been described above, the present invention is not limited to the scope of the above embodiments and various modifications can be made. For example, the present invention can be applied to pistons other than aluminum alloy pistons, such as cast iron pistons.
【００２１】また第２冷却空洞を機械加工で形成すれ
ば、その断面は実施例に示した矩形断面以外の種々の断
面にすることが容易に可能である。たとえば冷却効果を
増強するため、冷却空洞内に冷却フィンを設けることも
容易である。Further, if the second cooling cavity is formed by machining, the cross section thereof can easily be various cross sections other than the rectangular cross section shown in the embodiment. For example, it is easy to provide cooling fins in the cooling cavity to enhance the cooling effect.
【００２２】[0022]
【発明の効果】本発明は上述のような構成であるから、
燃焼室、トップリング溝あるいはピストン頂面に近接さ
せて冷却空洞を容易に設けることができる。したがって
ピストンの冷却を極めて効果的に行うことができ、しか
も上記冷却空洞の配設によって鋳造欠陥の生じるおそれ
も全くない。Since the present invention has the above-mentioned structure,
A cooling cavity can easily be provided close to the combustion chamber, top ring groove or piston top surface. Therefore, the piston can be cooled very effectively, and there is no risk of casting defects due to the arrangement of the cooling cavity.
【図１】第１実施例のピストン断面図。FIG. 1 is a sectional view of a piston according to a first embodiment.
【図２】第２実施例のピストン断面図。FIG. 2 is a sectional view of a piston according to a second embodiment.
【図３】第３実施例のピストン断面図。FIG. 3 is a sectional view of a piston according to a third embodiment.
【図４】図３におけるＩＶ−ＩＶ断面図。4 is a sectional view taken along line IV-IV in FIG.
１ ピストン頂面 ２ 燃焼室 ３ａ トップリング溝 ４ ピストン頂面側の部分 ７ 第１冷却空洞 ８ 第２冷却空洞 １１ 段付き部 １２ 凹部 １３ 透孔 １４ 環状円板（環状部材） １４′ アングル断面環状部材（環状部材） １４″ 偏心環状円板（環状部材） １５ ピストン主部 1 Piston Top Surface 2 Combustion Chamber 3a Top Ring Groove 4 Piston Top Surface Side Part 7 First Cooling Cavity 8 Second Cooling Cavity 11 Stepped Part 12 Recessed Section 13 Through Hole 14 Annular Disc (Annular Member) 14 'Angle Section Annular Member (annular member) 14 ″ Eccentric annular disc (annular member) 15 Piston main part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 内村 正和 埼玉県川越市大字大中居620番 イズミ工 業株式会社内 (72)発明者 増田 和生 埼玉県川越市大字大中居620番 イズミ工 業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Uchimura 620 No. Ō Nakai, Kawagoe City, Saitama Prefecture Izumi Kogyo Co., Ltd. (72) Inventor Kazuo Masuda 620 No. Ō Nakai, Kawagoe City, Saitama Prefecture In the company
Claims (6)
却空洞をその内部に有するピストンにおいて、 所定形状を付与されたピストン頂面側の部分と、このピ
ストン頂面側の部分に結合される環状部材とによって、
上記冷却空洞に連通される第２の冷却空洞を上記燃焼室
および／またはトップリング溝の近傍に設けたピスト
ン。1. A piston having a combustion chamber on the top surface of the piston and a cooling cavity inside the piston, wherein the piston top surface side portion provided with a predetermined shape is connected to the piston top surface side portion. With the annular member,
A piston in which a second cooling cavity communicating with the cooling cavity is provided near the combustion chamber and / or the top ring groove.
分とが結合される面は上記燃焼室外周の近傍と、上記ト
ップリング溝上方のピストン外周の近傍に設けられる請
求項１記載のピストン。2. The surface connecting the annular member and the portion on the piston top surface side is provided in the vicinity of the outer periphery of the combustion chamber and in the vicinity of the outer periphery of the piston above the top ring groove. piston.
囲繞する環状の段付き部が設けられた請求項１記載のピ
ストン3. The piston according to claim 1, wherein an annular stepped portion that surrounds the combustion chamber is provided at a portion on the piston top surface side.
囲繞する環状の段付き部と凹部とが設けられた請求項１
記載のピストン。4. A ring-shaped stepped portion surrounding the combustion chamber and a recess are provided in a portion on the piston top surface side.
The listed piston.
の内部に有するピストン主部を鋳造する段階と、 上記燃焼室囲りの頂面を環状に除去する段階と、 上記冷却空洞に開口される複数の透孔を上記除去された
部分の底面に形成する段階と、 上記除去された部分を環状部材にて被い、この部材の端
面を上記燃焼室外周の近傍と、トップリング溝上方の上
記ピストン主部の外周近傍とにおいて上記ピストン主部
に結合させ、ピストンの内部に第２の冷却空洞を形成す
る段階とから成る請求項１記載のピストンの製造方法。5. A step of casting a piston main part having a combustion chamber on its top surface and a cooling cavity inside thereof, a step of annularly removing the top surface of said combustion chamber surrounding, and said cooling cavity. Forming a plurality of through holes on the bottom surface of the removed portion, and covering the removed portion with an annular member, and the end surface of the member with the vicinity of the outer periphery of the combustion chamber and the top ring. 2. The method for manufacturing a piston according to claim 1, further comprising the step of forming a second cooling cavity inside the piston by connecting to the piston main portion near the outer periphery of the piston main portion above the groove.
低い環状部分とをその頂面に有しかつ冷却空洞をその内
部に有するピストン主部を鋳造する段階と、 上記冷却空洞に開口される複数の透孔を上記環状部分の
底面に形成する段階と、 上記環状部分を環状部材にて被い、この部材の端面を上
記燃焼室外周の近傍と、トップリング溝上方の上記ピス
トン主部の外周近傍とにおいて上記ピストン主部に結合
させ、ピストンの内部に第２の冷却空洞を形成する段階
とから成る請求項１記載のピストンの製造方法。6. A step of casting a piston main portion having a combustion chamber and an annular portion having a height lower than an outer peripheral edge of the combustion chamber on a top surface thereof and having a cooling cavity therein, and the cooling cavity. Forming a plurality of through holes on the bottom surface of the annular portion, covering the annular portion with an annular member, the end surface of the member near the outer periphery of the combustion chamber, and above the top ring groove. 2. The method for manufacturing a piston according to claim 1, further comprising the step of connecting to the piston main portion in the vicinity of the outer periphery of the piston main portion to form a second cooling cavity inside the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34619193A JPH07180605A (en) | 1993-12-22 | 1993-12-22 | Piston and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34619193A JPH07180605A (en) | 1993-12-22 | 1993-12-22 | Piston and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07180605A true JPH07180605A (en) | 1995-07-18 |
Family
ID=18381731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34619193A Pending JPH07180605A (en) | 1993-12-22 | 1993-12-22 | Piston and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07180605A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008520884A (en) * | 2004-11-24 | 2008-06-19 | フェデラル モーグル ナーンバーグ ゲーエムベーハー | Piston for internal combustion engine and combination of piston and oil injection device |
| JP2008522086A (en) * | 2004-11-30 | 2008-06-26 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Piston for internal combustion engine |
| WO2012110624A1 (en) * | 2011-02-17 | 2012-08-23 | Federal-Mogul Nürnberg GmbH | Method for producing a piston |
| JP2012193743A (en) * | 2012-07-17 | 2012-10-11 | Nissan Motor Co Ltd | Piston for internal combustion engine |
| WO2014012532A1 (en) * | 2012-07-18 | 2014-01-23 | Mahle International Gmbh | Piston for an internal combustion engine |
| WO2014012530A1 (en) * | 2012-07-18 | 2014-01-23 | Mahle International Gmbh | Piston for an internal combustion engine |
| JP2015528537A (en) * | 2012-08-31 | 2015-09-28 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | piston |
| CN108999717A (en) * | 2018-08-15 | 2018-12-14 | 全椒县全动机械有限公司 | A kind of diesel engine piston structure |
-
1993
- 1993-12-22 JP JP34619193A patent/JPH07180605A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008520884A (en) * | 2004-11-24 | 2008-06-19 | フェデラル モーグル ナーンバーグ ゲーエムベーハー | Piston for internal combustion engine and combination of piston and oil injection device |
| US7735462B2 (en) | 2004-11-24 | 2010-06-15 | Federal-Mogul Nurnberg Gmbh | Piston for an internal combustion engine and combination a piston provided with an oil injection device |
| JP2008522086A (en) * | 2004-11-30 | 2008-06-26 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング | Piston for internal combustion engine |
| WO2012110624A1 (en) * | 2011-02-17 | 2012-08-23 | Federal-Mogul Nürnberg GmbH | Method for producing a piston |
| JP2012193743A (en) * | 2012-07-17 | 2012-10-11 | Nissan Motor Co Ltd | Piston for internal combustion engine |
| WO2014012532A1 (en) * | 2012-07-18 | 2014-01-23 | Mahle International Gmbh | Piston for an internal combustion engine |
| WO2014012530A1 (en) * | 2012-07-18 | 2014-01-23 | Mahle International Gmbh | Piston for an internal combustion engine |
| JP2015528537A (en) * | 2012-08-31 | 2015-09-28 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテルハフツングＭＡＨＬＥ Ｉｎｔｅｒｎａｔｉｏｎａｌ ＧｍｂＨ | piston |
| CN108999717A (en) * | 2018-08-15 | 2018-12-14 | 全椒县全动机械有限公司 | A kind of diesel engine piston structure |
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