JP2001107803A - Manufacturing method of internal combustion engine piston - Google Patents
Manufacturing method of internal combustion engine pistonInfo
- Publication number
- JP2001107803A JP2001107803A JP28749599A JP28749599A JP2001107803A JP 2001107803 A JP2001107803 A JP 2001107803A JP 28749599 A JP28749599 A JP 28749599A JP 28749599 A JP28749599 A JP 28749599A JP 2001107803 A JP2001107803 A JP 2001107803A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- piston
- land portion
- top land
- manufacturing
- 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 17
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 12
- 238000001816 cooling Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 7
- 238000005242 forging Methods 0.000 abstract description 14
- 238000005461 lubrication Methods 0.000 abstract 1
- 239000010687 lubricating oil Substances 0.000 description 10
- 238000003466 welding Methods 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- 238000010894 electron beam technology Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000005304 joining Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 101100325793 Arabidopsis thaliana BCA2 gene Proteins 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- F02F2200/00—Manufacturing
- F02F2200/04—Forging of engine parts
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関ピストン
の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a piston of an internal combustion engine.
【０００２】[0002]
【従来の技術】内燃機関、特に直噴式ディーゼル機関の
ピストンには、図３で示すようにピストン本体２０の頂
面に燃焼室を構成するトロイダル型等のキャビテイ２１
と、このキャビティ２１の周囲に潤滑油等の冷却液を循
環させる環状空洞２２を設けた構造のものがあり、リン
グベルト２６にリング２７を備え、トップランド部とピ
ン穴を有するスカート部とが一体構造のピストンは周知
である。尚、図３において２３は機関のシリンダを示
す。2. Description of the Related Art As shown in FIG. 3, a piston 21 of a toroidal type or the like which forms a combustion chamber on the top surface of a piston body 20 is provided on a piston of an internal combustion engine, particularly a direct injection type diesel engine.
And a structure in which an annular cavity 22 for circulating a coolant such as lubricating oil is provided around the cavity 21. A ring belt 26 is provided with a ring 27, and a top land portion and a skirt portion having a pin hole are provided. Monolithic pistons are well known. In FIG. 3, reference numeral 23 denotes a cylinder of the engine.
【０００３】[0003]
【発明が解決しようとする課題】上記ピストンは鍛造あ
るいは鋳造によって製作される。しかし、キャビティ２
１の周囲に冷却用の環状空洞２２を設けた構造のもは崩
壊性中子を使用することによって鋳造することが可能で
あるが鍛造では不可能である。The piston is manufactured by forging or casting. But cavity 2
The structure provided with the annular cavity 22 for cooling around 1 can be cast by using a collapsible core, but cannot be formed by forging.
【０００４】ディーゼル機関では、排気ガス浄化、燃費
低減の両立を図りながら高出力化を達成するために、高
過給化が進みキャビティ２１内のスワール及びスキッシ
ュにより燃料と空気との混合を良くし燃焼効率を高めて
いる。その結果、キャビティエッジ部２４が最も高温に
となり、キャビティ２１の周囲に潤滑油等の冷却液を循
環させるための環状空洞２２を設けた鋳造のピストンで
は環状空洞２２による冷却で温度低下するが、環状空洞
２２を設けることが不可能な鍛造によるピストンでは熱
容量の小さいキャビティ２１の周縁部は亀裂２５が発生
しやすく、ピストンの耐熱強度、機械強度の一層の向上
が要求されている。[0004] In a diesel engine, in order to achieve high output while achieving both exhaust gas purification and fuel consumption reduction, high supercharging is progressed, and swirl and squish in the cavity 21 improve mixing of fuel and air. Increases combustion efficiency. As a result, the temperature of the cavity edge portion 24 becomes the highest, and in a casting piston in which the annular cavity 22 for circulating a cooling liquid such as lubricating oil is provided around the cavity 21, the temperature is lowered by cooling by the annular cavity 22, In a forged piston in which the annular cavity 22 cannot be provided, the peripheral portion of the cavity 21 having a small heat capacity is liable to crack 25, and further improvement in heat resistance and mechanical strength of the piston is required.
【０００５】前記リング２７群のうちのトップリングを
支えるリング溝は、爆発圧力でトップリングが叩き付け
られて摩耗が発生するる部位であるが、高温の爆発ガス
にさらされて摩耗や潤滑油が膠着しリング２７とライナ
間のスカッフ現象が生じ、前記キャビティ２１の周縁部
の亀裂２５の発生とによってピストンやシリンダの寿命
に影響を及ぼしている。この部位は外部から冷却が取り
難いところであるために摩耗対策の困難な部位のひとつ
である。The ring groove supporting the top ring of the ring 27 group is a portion where the top ring is hit by the explosion pressure and wear occurs. However, the ring groove is exposed to a high-temperature explosive gas and wear and lubricating oil are removed. The scuff phenomenon occurs between the sticking ring 27 and the liner, and the generation of a crack 25 at the peripheral edge of the cavity 21 affects the life of the piston or cylinder. This part is one of the parts where it is difficult to take measures against abrasion because it is difficult to take cooling from the outside.
【０００６】前記亀裂２５の発生及びトップリング摩耗
対策、リング溝の潤滑油膠着対策には材料特性の向上と
冷却能力の向上が不可欠であり、前記鋳造により崩壊性
中子を使用することによってキャビティ２１の周囲に冷
却用の環状空洞２２を設けることは可能であるが、鋳物
の体熱強度を限界とし、また、崩壊性中子の製造精度が
冷却用の環状空胴２２の大きさ決定し冷却能力に限界が
あり、鍛造ではキャビティ周囲を冷却するための空洞が
得られない問題があった。In order to prevent the occurrence of the cracks 25, to prevent wear of the top ring, and to prevent sticking of the lubricating oil in the ring groove, it is essential to improve the material properties and the cooling capacity. Although it is possible to provide an annular cavity 22 for cooling around the periphery of 21, the heat intensity of the casting is limited, and the manufacturing accuracy of the collapsible core determines the size of the annular cavity 22 for cooling. There is a limit in the cooling capacity, and there is a problem in the forging that a cavity for cooling around the cavity cannot be obtained.
【０００７】本発明の目的は、キャビティ周囲を冷却す
るための空洞を有し、かつトップリング摩耗対策、リン
グ溝の潤滑油膠着対策を確保した鍛造による内燃機関ピ
ストンの製造方法を提供することである。An object of the present invention is to provide a method for manufacturing an internal combustion engine piston by forging, which has a cavity for cooling the periphery of the cavity, and measures against wear of the top ring and measures against sticking of lubricating oil in the ring groove. is there.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
め本発明は、請求項１においては、トップランド部とス
カート部とからなり前記トップランド部の頂面にキャビ
ティを形成し、かつ前記キャビティの周囲に冷却用の環
状空洞が形成されているピストンの製造方法であって、
前記トップランド部とスカート部とをキャビティの周囲
に形成される環状空胴を上下に切断する方向で分割して
それぞれ鍛造成形し、前記トップランド部とスカート部
の分割面を接合一体化することを特徴とするものであ
る。In order to achieve the above object, according to the present invention, in the first aspect, a cavity is formed on a top surface of the top land portion, the cavity comprising a top land portion and a skirt portion. A method of manufacturing a piston in which an annular cavity for cooling is formed around a cavity,
Dividing the top land portion and the skirt portion in a direction in which an annular cavity formed around the cavity is vertically cut and forging each, and joining the divided surfaces of the top land portion and the skirt portion together. It is characterized by the following.
【０００９】請求項２においては、トップランド部とス
カート部とからなり前記トップランド部の頂面にキャビ
ティを形成し、かつ前記キャビティの周囲に冷却用の環
状空洞が形成されているピストンの製造方法であって、
前記トップランド部の周縁を前記環状空胴の一部を含め
てトップランド部の頂面と平行な第１分割面とトップラ
ンド部の頂面と環状空胴とに渡る前記第１分割面と直交
した第２分割面とによって分割してトップランド部の周
縁に切り欠きを有するピストン本体と前記切り欠きに対
応する環状体とをそれぞれ鍛造成形し、前記第１分割面
と第２分割面を接合一体化することを特徴とするもので
ある。According to a second aspect of the present invention, there is provided a method of manufacturing a piston comprising a top land portion and a skirt portion, wherein a cavity is formed on a top surface of the top land portion, and an annular cooling cavity is formed around the cavity. The method
A first divisional surface parallel to a top surface of the topland portion including a periphery of the topland portion including a part of the annular cavity, and a first divisional surface extending between the top surface of the topland portion and the annular cavity. The piston body having the notch at the periphery of the top land portion and the annular body corresponding to the notch are forged and formed by dividing the first split surface and the second split surface by the orthogonal second split surface. It is characterized by joining and integrating.
【００１０】[0010]
【発明の実施の形態】以下本発明の実施の形態を図面に
基づいて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【実施例１】図１は本発明の実施例１の製造方法によっ
て製造したピストンの要部断面図である。１はピストン
本体であり、頂面６にはキャビティ７が形成されてお
り、このキャビティ７の周囲に潤滑油等の冷却液を循環
させるための環状空胴８を有しトップランド部２とスカ
ート部３とを分割面９で前記環状空胴８を上下に切断す
る方向で分割されている。また、スカート部３側にリン
グベルト４を形成し、これに設けられた所定数のリング
溝に所定のリング５が嵌装されている。符号２３は機関
のシリンダを示す。FIG. 1 is a sectional view of a main part of a piston manufactured by a manufacturing method according to a first embodiment of the present invention. Reference numeral 1 denotes a piston body, and a cavity 7 is formed on a top surface 6, and an annular cavity 8 for circulating a cooling liquid such as lubricating oil around the cavity 7 is provided. The portion 3 is divided by a dividing surface 9 in a direction of cutting the annular cavity 8 up and down. A ring belt 4 is formed on the skirt 3 side, and a predetermined ring 5 is fitted in a predetermined number of ring grooves provided in the ring belt 4. Reference numeral 23 indicates an engine cylinder.
【００１１】前記トップランド部２は耐亀裂性を考慮し
て例えば、硫黄鋼の金属材料を選択し、スカート部３は
例えば、高硫黄鋼、カルシウム添加鋼等の強度と切削性
の良い金属材料を選択して、キャビティ７の周囲に形成
する冷却用の環状空洞８を分割面９によって上下に切断
する方向で分割したトップランド部２とスカート部３と
をそれぞれ鍛造によって別個に製造し、この両者の分割
面９を対接して圧接装置によって圧接して拡散接合ある
いは電子ビーム等の溶接手段によって接合一体化する。The top land portion 2 is made of, for example, a metal material of sulfur steel in consideration of crack resistance, and the skirt portion 3 is made of, for example, a metal material having good strength and machinability such as high sulfur steel, calcium-added steel, or the like. The top land portion 2 and the skirt portion 3 obtained by dividing the cooling annular cavity 8 formed around the cavity 7 in the direction of cutting vertically by the dividing surface 9 are separately manufactured by forging, respectively. The two divided surfaces 9 are brought into contact with each other and pressed by a pressure welding device, and are joined and integrated by diffusion bonding or welding means such as an electron beam.
【００１２】前記冷却用の環状空洞８を上下に切断する
方向で分割した分割面９は図１においては上下に段差を
有して分割しているが、段差を有しない同一線で分割し
ても良いし、図２で示すように、環状空洞８を中央にし
てトップランド部２の周縁との間の壁は図１と同様にト
ップランド部２の頂面６と平行な線の分割面９とし、環
状空洞８を中央にしてキャビティ７と環状空洞８との間
の壁はキャビティ７の内壁から環状空洞８に向かって下
向きに傾斜した傾斜分割面９ａで環状空洞８を上下に切
断してトップランド部２とスカート部３を分割しそれぞ
れ鍛造によって別個に製造して、両者の分割面９、傾斜
分割面９ａを対接して圧接装置によって圧接して拡散接
合あるいは電子ビーム等の溶接手段によって接合一体化
するものである。The dividing surface 9 obtained by dividing the cooling annular cavity 8 in the direction of vertically cutting it is divided in FIG. 1 with a vertical step, but is divided by the same line having no step. Alternatively, as shown in FIG. 2, the wall between the annular cavity 8 and the periphery of the top land portion 2 with the annular cavity 8 at the center may be a dividing plane of a line parallel to the top surface 6 of the top land portion 2 as in FIG. 9 and the wall between the cavity 7 and the annular cavity 8 is formed by cutting the annular cavity 8 up and down at an inclined dividing surface 9a inclined downward from the inner wall of the cavity 7 toward the annular cavity 8 with the annular cavity 8 as a center. The top land portion 2 and the skirt portion 3 are divided and separately manufactured by forging, and the divided surface 9 and the inclined divided surface 9a thereof are brought into contact with each other and pressed by a pressing device to perform welding such as diffusion bonding or electron beam. Are joined and integrated.
【００１３】[0013]
【実施例２】図３は本発明の実施例２の製造方法によっ
て製造したピストンの要部断面図である。１はピストン
本体であり、頂面６にはキャビティ７が形成されてお
り、このキャビティ７の周囲に潤滑油等の冷却液を循環
させるための環状空胴８を有している。また、スカート
部３側にリングベルト４を形成し、これに設けられた所
定数のリング溝に所定のリング５が嵌装されている。符
号２３は機関のシリンダを示す。Embodiment 2 FIG. 3 is a sectional view of a main part of a piston manufactured by a manufacturing method according to Embodiment 2 of the present invention. Reference numeral 1 denotes a piston body, and a cavity 7 is formed in a top surface 6. The cavity 7 has an annular cavity 8 around the cavity 7 for circulating a coolant such as lubricating oil. A ring belt 4 is formed on the skirt 3 side, and a predetermined ring 5 is fitted in a predetermined number of ring grooves provided in the ring belt 4. Reference numeral 23 indicates an engine cylinder.
【００１４】この実施例２の製造方法は、前記トップラ
ンド部２の周縁を前記環状空胴８の一部を含めてトップ
ランド部２の頂面６と平行な第１分割面９ｂとトップラ
ンド部２の頂面６と環状空胴８とに渡る前記第１分割面
９ｂと直交した第２分割面９ｃとによって分割してトッ
プランド部２の周縁に切り欠きを有するピストン本体１
と前記切り欠きに対応する環状体１０とをそれぞれ鍛造
成形し、前記第１分割面９ｂと第２分割面９ｃを対接し
て圧接装置によって圧接して拡散接合あるいは電子ビー
ム等の溶接手段によって接合一体化するものである。The manufacturing method according to the second embodiment is characterized in that the top land portion 2 includes a first divided surface 9b parallel to the top surface 6 of the top land portion 2 including a part of the annular cavity 8 and a top division surface. The piston body 1 having a notch at the periphery of the top land portion 2 by being divided by a second dividing surface 9c orthogonal to the first dividing surface 9b and extending across the top surface 6 of the portion 2 and the annular cavity 8
And the annular body 10 corresponding to the notch are formed by forging, respectively, and the first divided surface 9b and the second divided surface 9c are brought into contact with each other and pressed by a pressure welding device to be joined by diffusion bonding or welding means such as an electron beam. It is integrated.
【００１５】前記圧接による拡散接合では環状空胴８に
圧接のバリが生じるが、このバリがフィンのような作用
を行って、環状空胴８を流動する潤滑油等による冷却効
果を良好にする。また、鍛造による環状空胴８の精度向
上と強度アップした材料により、環状空胴８の周辺の肉
厚を薄くすることができるので、熱の伝達距離を短縮し
冷却効果を高める。In the diffusion bonding by the pressure welding, burrs of the pressure contact are generated in the annular cavity 8. The burrs act like fins to improve the cooling effect by the lubricating oil flowing through the annular cavity 8. . Further, the thickness of the periphery of the annular cavity 8 can be reduced by using a material having improved accuracy and strength of the annular cavity 8 by forging, so that the heat transmission distance is shortened and the cooling effect is enhanced.
【００１６】その結果、キャビティ７の周囲を冷却が向
上し、キャビティ７の周縁部の亀裂発生を抑止すると共
に、リングベルト４も冷却が向上してトップリング摩
耗、リング溝の潤滑油膠着を防止し、スカッフ現象を未
然に防止できる。As a result, the cooling around the cavity 7 is improved, and the generation of cracks at the peripheral portion of the cavity 7 is suppressed, and the cooling of the ring belt 4 is also improved to prevent wear of the top ring and sticking of lubricating oil in the ring groove. In addition, the scuff phenomenon can be prevented.
【００１７】上記したように本発明は図１及び図２で示
すトップランド部２とスカート部３あるいは図３で示す
トップランド部２の周縁に切り欠きを有するピストン本
体１と前記切り欠きに対応する環状体１０とをそれぞれ
鍛造成形し、こをれを圧接装置によって圧接して拡散接
合あるいは電子ビーム等の溶接手段によって接合一体化
するものであるが、図２及び図３で示す分割形態におい
ては電子ビームで溶接する場合に、電子銃からのビーム
照射が容易かつ適格に行うことができる。特に図２の傾
斜分割面９ａではキャビティ７と環状空胴８との間の比
較的に厚さが薄い壁の接合において接合面積が大きく得
られ接合強度が一層確保される。As described above, the present invention corresponds to the piston body 1 having the top land portion 2 and the skirt portion 3 shown in FIGS. 1 and 2 or the notch in the periphery of the top land portion 2 shown in FIG. Each of the annular bodies 10 to be forged is formed by forging, and these are pressed by a pressing device to be joined and integrated by a welding means such as diffusion bonding or an electron beam. When welding with an electron beam, beam irradiation from an electron gun can be easily and appropriately performed. In particular, in the inclined division surface 9a in FIG. 2, a large joining area is obtained in joining a relatively thin wall between the cavity 7 and the annular cavity 8, and the joining strength is further secured.
【００１８】キャビティエッジ部はシャープにするほ
ど、機関の圧縮上死点付近でピストン頂面に残留する空
気が勢いよくスキッシュし、スキッシュ流の境界に乱流
が発生してキャビティ内に噴射された霧化燃料粒子と空
気の混合を促進させ燃焼効率を高めるが、キャビティエ
ッジ部がシャープになるほどヒートスポットになりやす
く、耐熱度が低下してキャビティの周縁部に亀裂が発生
しやすいが、本発明によると環状空胴８の周辺の肉厚を
薄くし、熱の伝達距離を短縮して冷却効果を高めるた
め、キャビティエッジ部をシャープ化しても亀裂の発生
がなくなり、キャビティエッジ部のシャープ化により高
出力化に対応する。As the cavity edge portion becomes sharper, air remaining on the piston top surface vigorously squishes near the compression top dead center of the engine, and turbulence is generated at the boundary of the squish flow and injected into the cavity. Although the mixing of atomized fuel particles and air is promoted to increase the combustion efficiency, the sharper the edge of the cavity is, the more likely it is to be a heat spot, the lower the heat resistance is, and the easier it is for the peripheral edge of the cavity to crack. According to the method, the thickness around the annular cavity 8 is reduced, the heat transfer distance is shortened, and the cooling effect is enhanced. Therefore, even if the cavity edge is sharpened, cracks are not generated, and the cavity edge is sharpened. Corresponds to high output.
【００１９】また、軽量化は勿論のこと、図１の矢印
Ａ、Ｂ、Ｃのように爆発圧力伝達が分散され、環状空洞
８の中空構造の剛性が高まり爆発圧力による環状空洞８
の変形が抑制される。In addition to the weight reduction, the transmission of the explosion pressure is dispersed as shown by arrows A, B and C in FIG. 1, the rigidity of the hollow structure of the annular cavity 8 is increased, and the annular cavity 8 due to the explosion pressure is increased.
Is suppressed.
【００２０】[0020]
【発明の効果】以上述べたように本発明によると、従来
鍛造では製造が不可能であったキャビティの周囲に冷却
用の環状空洞を設けた構造で、鋳造ピストンに比較して
機関の高出力でピストンの最高爆発圧力、平均有効圧を
越える要件を満足したピストンを鍛造により製造を可能
とし、鋳造ピストンにおけるキャビティの周縁部の冷却
効果を向上し、キャビティの周縁部の亀裂の発生の防止
とトップリング摩耗対策やリング溝の潤滑油膠着対策を
確保してスカッフ現象を未然に防止をすることができ
る。また、キャビティエッジ部をシャープ化することが
でき、これにより、機関の圧縮上死点付近でピストン頂
面に残留する空気が勢いよくスキッシュし、スキッシュ
流の境界に乱流が発生してキャビティ内に噴射された霧
化燃料粒子と空気の混合を促進させ燃焼効率を高め、排
気ガス浄化、燃費低減の両立を図りながら高出力化を達
成することができる品質の信頼性の高い鍛造ピストンを
低コストで提供することができる利点を有している。As described above, according to the present invention, a structure in which an annular cavity for cooling is provided around a cavity which cannot be manufactured by conventional forging, and has a higher engine output than a cast piston. By forging a piston that meets the requirements of exceeding the maximum explosion pressure and average effective pressure of the piston by forging, improving the cooling effect of the peripheral part of the cavity in the cast piston, preventing cracks on the peripheral part of the cavity and The scuff phenomenon can be prevented beforehand by taking measures against top ring abrasion and measures against sticking of lubricating oil in the ring groove. Also, the cavity edge can be sharpened, so that the air remaining on the piston top surface squishes vigorously near the compression top dead center of the engine, and turbulence is generated at the boundary of the squish flow, causing A highly reliable forged piston of high quality that can increase the combustion efficiency by promoting the mixing of the atomized fuel particles injected into the air with the air to improve combustion efficiency and achieve high output while achieving both exhaust gas purification and fuel consumption reduction It has the advantage that it can be provided at a cost.
【図１】本発明の実施例１の製造方法によって製造した
ピストンの要部断面図FIG. 1 is a sectional view of a main part of a piston manufactured by a manufacturing method according to a first embodiment of the present invention.
【図２】本発明の実施例１の変形例の製造方法によって
製造したピストンの要部断面図FIG. 2 is a sectional view of a main part of a piston manufactured by a manufacturing method according to a modification of the first embodiment of the present invention.
【図３】本発明の実施例２の製造方法によって製造した
ピストンの要部断面図FIG. 3 is a sectional view of a main part of a piston manufactured by a manufacturing method according to a second embodiment of the present invention.
【図４】従来のピストンを示す要部断面図FIG. 4 is a sectional view of a main part showing a conventional piston.
１ ピストン本体 ２ トップランド部 ３ スカート部 ４ リングベルト ５ リング ６ 頂面 ７ キャビティ ８ 環状空洞 ９ 分割面 ９ａ 傾斜分割面 ９ｂ 第１分割面 ９ｃ 第２分割面 １０ 環状体 DESCRIPTION OF SYMBOLS 1 Piston main body 2 Top land part 3 Skirt part 4 Ring belt 5 Ring 6 Top surface 7 Cavity 8 Annular cavity 9 Dividing surface 9a Inclined dividing surface 9b First dividing surface 9c Second dividing surface 10 Annular body
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田村 伊久生 群馬県前橋市元総社町395番地の３ 理研 鍛造株式会社内 (72)発明者 河原 隆幸 群馬県前橋市元総社町395番地の３ 理研 鍛造株式会社内 Ｆターム(参考） 3J044 AA02 AA09 AA18 CA01 CA18 EA10 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ikuo Tamura 395-3 Motogensha-cho, Maebashi-shi, Gunma Inside RIKEN Forging Co., Ltd. (72) Inventor Takayuki Kawahara 3rd 395 Motogensha-cho, Maebashi-shi, Gunma RIKEN F-term (for reference) in Forging Co., Ltd. 3J044 AA02 AA09 AA18 CA01 CA18 EA10
Claims (2)
前記トップランド部の頂面にキャビティを形成し、かつ
前記キャビティの周囲に冷却用の環状空洞が形成されて
いるピストンの製造方法であって、前記トップランド部
とスカート部とをキャビティの周囲に形成される環状空
胴を上下に切断する方向で分割してそれぞれ鍛造成形
し、前記トップランド部とスカート部の分割面を接合一
体化することを特徴とする内燃機関のピストン製造方
法。1. A method for manufacturing a piston comprising a top land portion and a skirt portion, wherein a cavity is formed on a top surface of the top land portion, and an annular cavity for cooling is formed around the cavity. The top land portion and the skirt portion are divided in a direction in which an annular cavity formed around the cavity is vertically cut and forged, and the top land portion and the skirt portion are joined and integrated. A method for manufacturing a piston of an internal combustion engine, comprising:
前記トップランド部の頂面にキャビティを形成し、かつ
前記キャビティの周囲に冷却用の環状空洞が形成されて
いるピストンの製造方法であって、前記トップランド部
の周縁を前記環状空胴の一部を含めてトップランド部の
頂面と平行な第１分割面とトップランド部の頂面と環状
空胴とに渡る前記第１分割面と直交した第２分割面とに
よって分割してトップランド部の周縁に切り欠きを有す
るピストン本体と前記切り欠きに対応する環状体とをそ
れぞれ鍛造成形し、前記第１分割面と第２分割面を接合
一体化することを特徴とする内燃機関のピストン製造方
法。2. A method for manufacturing a piston, comprising a top land portion and a skirt portion, wherein a cavity is formed on a top surface of the top land portion, and a cooling annular cavity is formed around the cavity. A first divisional surface extending around a periphery of the top land portion including a part of the annular cavity and parallel to a top surface of the top land portion, and a first divisional surface extending between the top surface of the top land portion and the annular cavity. A piston body having a notch in the periphery of the top land portion and an annular body corresponding to the notch, which are divided by a second division surface orthogonal to the first and second division surfaces, respectively, and the first division surface and the second division surface are formed. And a method of manufacturing a piston for an internal combustion engine.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28749599A JP2001107803A (en) | 1999-10-08 | 1999-10-08 | Manufacturing method of internal combustion engine piston |
| EP00307589A EP1084793A1 (en) | 1999-09-20 | 2000-09-04 | Method of manufacturing piston of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28749599A JP2001107803A (en) | 1999-10-08 | 1999-10-08 | Manufacturing method of internal combustion engine piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001107803A true JP2001107803A (en) | 2001-04-17 |
Family
ID=17718092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28749599A Pending JP2001107803A (en) | 1999-09-20 | 1999-10-08 | Manufacturing method of internal combustion engine piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001107803A (en) |
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| JP2008522089A (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 | Two-part piston for internal combustion engines |
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