JPH06280676A - Cast iron made piston - Google Patents
Cast iron made pistonInfo
- Publication number
- JPH06280676A JPH06280676A JP9046093A JP9046093A JPH06280676A JP H06280676 A JPH06280676 A JP H06280676A JP 9046093 A JP9046093 A JP 9046093A JP 9046093 A JP9046093 A JP 9046093A JP H06280676 A JPH06280676 A JP H06280676A
- Authority
- JP
- Japan
- Prior art keywords
- oil gallery
- oil
- inlet
- crown portion
- gallery
- 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
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
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】本発明は、クラウン部の内部に冷
却オイル用のオイルギャラリーを有する鋳鉄製ピストン
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast iron piston having an oil gallery for cooling oil inside a crown portion.
【０００２】内燃機関は、図５に示す如く、シリンダ２
１内の燃焼室２２内で燃料と空気との混合気を爆発さ
せ、その力でシリンダ２１内のピストン２３を連続往復
動させ、コンロッドとクランクシャフトとを介して、往
復運動を回転運動に変換し、機械的出力を外部に供給す
る働きをする。往復動するピストン２３は、一般には、
鋳鉄製で、高温となるクラウン部２４の冷却のため、冷
却用のオイルを循環させるオイルギャラリー２５を有
す。As shown in FIG. 5, an internal combustion engine has a cylinder 2
The mixture of fuel and air is exploded in the combustion chamber 22 in 1 and the piston 23 in the cylinder 21 is continuously reciprocated by the force, and the reciprocating motion is converted into the rotary motion via the connecting rod and the crankshaft. And serves to supply mechanical output to the outside. The reciprocating piston 23 is generally
It is made of cast iron and has an oil gallery 25 that circulates cooling oil for cooling the crown portion 24 that becomes hot.
【０００３】燃料経済性と排ガス浄化特性の向上のた
め、ピストン２３のクラウン部２４の頂面をコンケーブ
（凹状）２２とさせ、これを燃焼室２２とすることが、
しばしば、成される。特に、これはディーゼルエンジン
に多用される。ピストンクラウン部２４の頂面の燃焼室
２２の中心は、図５に明示する如く、クラウン部２４の
中心より一方に偏心させる。この結果、オイルギャラリ
ー２５の形状は、図５に示す如く、冷却オイル用の入口
２６から出口２７へとその流路面積を大とさせるもので
ある。尚、入口２６からオイルギャラリー２５内へ入っ
た冷却オイルは、左右に分けられ、共に、対向側の出口
２７方向へと流れる。又、冷却オイルの入口２６への供
給は、クランク室側の噴射ノズルから入口２６に向けて
冷却オイルを噴射させる等の手段を用いる。In order to improve fuel economy and exhaust gas purification characteristics, the top surface of the crown portion 24 of the piston 23 may be made into a concave (concave) 22 and used as the combustion chamber 22.
Often done. In particular, it is heavily used in diesel engines. The center of the combustion chamber 22 on the top surface of the piston crown portion 24 is eccentric to one side from the center of the crown portion 24, as clearly shown in FIG. As a result, the shape of the oil gallery 25 increases the flow passage area from the cooling oil inlet 26 to the outlet 27 as shown in FIG. The cooling oil that has entered the oil gallery 25 from the inlet 26 is divided into left and right, and both flow toward the outlet 27 on the opposite side. To supply the cooling oil to the inlet 26, a means such as injecting the cooling oil from the injection nozzle on the crank chamber side toward the inlet 26 is used.
【０００４】[0004]
【本発明が解決しようとする課題】従来のオイルギャラ
リーは、図６からも理解される如く、その入口側の流路
面積が小さく、このため、冷却オイルがオイルギャラリ
ー内に入り難く、しかも、オイルギャラリー内に入った
オイルは出口側へと向き入口側での滞留時間が短い。こ
のため、クラウン部の冷却が不充分なものとなる。それ
故に、本発明は、前述した従来技術の不具合を解消させ
ることを解決すべき課題とする。As can be understood from FIG. 6, the conventional oil gallery has a small flow passage area on the inlet side, which makes it difficult for cooling oil to enter the oil gallery. The oil that has entered the oil gallery faces the outlet side and the residence time on the inlet side is short. For this reason, the cooling of the crown portion becomes insufficient. Therefore, it is an object of the present invention to solve the above-mentioned problems of the conventional technology.
【０００５】[0005]
【課題を解決するための手段】本発明は、前述した課題
の解決のために、基本的には、オイルギャラリー部の底
面を斜面とさせ、オイルギャラリーの入口側の流路面積
を大とさせる技術的手段を採用する。In order to solve the above-mentioned problems, the present invention basically makes the bottom surface of the oil gallery part an inclined surface to increase the flow passage area on the inlet side of the oil gallery. Adopt technical means.
【０００６】より具体的には、本発明は、外周面にピス
トンリング溝及び頂面に燃焼室を有するクラウン部と、
クラウン部より下方に延在するスカート部と、クラウン
部とスカート部の内周側に設けられたピンボス部と、お
よびクラウン部の内部に設け且つ冷却用オイルの入口と
出口とを有する環状のオイルギャラリーとを有し、燃焼
室中心がクラウン部中心に対し偏心し、クラウン部の底
面が前記偏心側で下方となる斜面とさせ前記偏心側のオ
イルギャラリーの断面を大とさせる鋳鉄製ピストンを提
供する。More specifically, the present invention relates to a crown portion having a piston ring groove on the outer peripheral surface and a combustion chamber on the top surface,
An annular oil having a skirt portion extending below the crown portion, a pin boss portion provided on the inner peripheral side of the crown portion and the skirt portion, and an inlet and an outlet for cooling oil provided inside the crown portion. Provided is a cast iron piston having a gallery, in which the center of the combustion chamber is eccentric with respect to the center of the crown portion, and the bottom surface of the crown portion is an inclined surface that is downward on the eccentric side and the cross section of the eccentric side oil gallery is large. To do.
【０００７】好ましくは、オイルギャラリーの入口中心
に、オイルギャラリーの外周面から半径方向内方へと突
出する山形部を配する又、オイルギャラリーの入口の内
周面をオイルギャラリーの内部に突出させる。[0007] Preferably, a mountain-shaped portion protruding radially inward from the outer peripheral surface of the oil gallery is arranged at the center of the oil gallery inlet, and the inner peripheral surface of the oil gallery inlet is protruded into the oil gallery. .
【０００８】[0008]
【作用】本発明によるオイルギャラリーは、ピストンク
ラウン部内に傾斜した形で存在するので、入口側の流路
面積を大とし、且つオイルの滞留時間を長くさせて冷却
効果を高め得る。又、入口部の改良は、冷却オイルのオ
イルギャラリーへの導入を容易にする。Since the oil gallery according to the present invention exists in a slanted shape in the piston crown portion, the flow passage area on the inlet side can be increased and the oil retention time can be lengthened to enhance the cooling effect. Also, the improved inlet section facilitates the introduction of cooling oil into the oil gallery.
【０００９】[0009]
【実施例】鋳鉄製のピストン１は、上部側に、外周面に
ピストンリング溝２を有するクラウン部３と、その下方
へと延在するスカート部１３と、スカート部１３とクラ
ウン部３とに一体に成形されるピンボス部１４とよりな
る。クラウン部３の頂面に燃焼室５を有し、その内部に
オイルギャラリー４が環状に設けられる。燃焼室５の中
心がクラウン部３の中心に対し一方に偏心し、且つクラ
ウン部３の底面１５が前記偏心側が下方となる斜面とす
る。オイルギャラリー４は、クラウン部３内に、図１に
示す断面でみて、斜めに位置し、前記偏心側の流路面積
６を小とし且つ反対側の流路面積７を大とする。EXAMPLE A cast iron piston 1 includes a crown portion 3 having a piston ring groove 2 on an outer peripheral surface, a skirt portion 13 extending downward, a skirt portion 13 and a crown portion 3 on an upper side. The pin boss portion 14 is integrally formed. A combustion chamber 5 is provided on the top surface of the crown portion 3, and an oil gallery 4 is annularly provided inside the combustion chamber 5. The center of the combustion chamber 5 is eccentric to the center of the crown portion 3, and the bottom surface 15 of the crown portion 3 is a slope whose eccentric side is downward. The oil gallery 4 is obliquely located in the crown portion 3 as viewed in the cross section shown in FIG. 1, and the flow passage area 6 on the eccentric side is small and the flow passage area 7 on the opposite side is large.
【００１０】オイルギャラリー４の小さい流路面積６に
冷却オイルの入口９を、大きい流路面積７側に出口１６
を設ける。噴射ノズル等により入口９へ噴射された冷却
オイルは入口９に入り、オイルギャラリー４内に滞留し
ながら新しく入ってくる冷却オイルに押され出口１６へ
と向い、やがて、該出口１６からクランクケース内へ強
制排出されるが、傾斜したオイルギャラリー４は冷却オ
イルの滞留時間を長くし、ピストンを効率よく冷却させ
るのに有効である。An inlet 9 for cooling oil is provided in the small flow passage area 6 of the oil gallery 4, and an outlet 16 is provided in the large flow passage area 7 side.
To provide. The cooling oil injected into the inlet 9 by the injection nozzle or the like enters the inlet 9, is pushed by the new incoming cooling oil while staying in the oil gallery 4 and is directed toward the outlet 16, and then from the outlet 16 into the crankcase. Although the oil gallery 4 is forcibly discharged to, the inclined oil gallery 4 is effective for prolonging the residence time of the cooling oil and efficiently cooling the piston.
【００１１】図２はオイルギャラリー４の流路面積即ち
空間部を示すが、その入口９の中心に沿う形でその陵線
が位置する断面三角形の山形部１０をオイルギャラリー
４の内周面に上向きのテーパ形に設ける。この山形部
は、入口９に入った冷却オイルの流れ８を左右に均一に
分配させるのに有用である。FIG. 2 shows a flow passage area, that is, a space portion of the oil gallery 4, and a mountain-shaped portion 10 having a triangular cross section in which the ridgeline is located along the center of the inlet 9 is formed on the inner peripheral surface of the oil gallery 4. It is provided in an upward taper shape. This chevron is useful for evenly distributing the cooling oil flow 8 entering the inlet 9 left and right.
【００１２】冷却オイルの入口９は、上下に延在するリ
ブ１１、１２により画定する。上方リブ１２は、オイル
ギャラリー４内に入った冷却オイルがオイルギャラリー
４内にとどまらせるのに有効である。下部リブ１１の開
口を大とさせ、オイルの入りを良くするとよい。The cooling oil inlet 9 is defined by vertically extending ribs 11, 12. The upper ribs 12 are effective in keeping the cooling oil that has entered the oil gallery 4 in the oil gallery 4. It is advisable to make the opening of the lower rib 11 large so that the oil can be easily entered.
【００１３】[0013]
【効果】環状のオイルギャラリーをピストンクラウン部
に斜めに配し、冷却オイルを押し上げていくようにして
流すのでその滞留時間を長くさせ得る。さらに、クラウ
ン部の断面積は従来より大であるが、オイルギャラリー
としての空間も大となるので、重量増加はなく、ピスト
ン鋳造法も従前通りでよい。[Effect] Since the annular oil gallery is diagonally arranged on the piston crown portion and the cooling oil is pushed up to flow, the retention time can be lengthened. Furthermore, although the cross-sectional area of the crown portion is larger than before, the space for the oil gallery is also large, so there is no increase in weight and the piston casting method can be the same as before.
【図１】本発明の一例のピストンの断面図である。FIG. 1 is a sectional view of a piston according to an example of the present invention.
【図２】オイルギャラリーの形状を示す部分斜視図であ
る。FIG. 2 is a partial perspective view showing the shape of an oil gallery.
【図３】入口部分の断面図である。FIG. 3 is a sectional view of an inlet portion.
【図４】入口部分の展開図である。FIG. 4 is a development view of an entrance portion.
【図５】従来のピストンの断面図である。FIG. 5 is a sectional view of a conventional piston.
【図６】従来のオイルギャラリーの形状を示す部分斜視
図である。FIG. 6 is a partial perspective view showing the shape of a conventional oil gallery.
１ ピストン ２ リング溝 ３ クラウン部 ４ オイルギャラリー ５ 燃焼室 ９ 入口 １０ 山形部 １１、１２ リブ １３ スカート部 １４ ピンボス部 １６ 出口 1 Piston 2 Ring groove 3 Crown part 4 Oil gallery 5 Combustion chamber 9 Inlet 10 Chevron part 11, 12 Rib 13 Skirt part 14 Pin boss part 16 Outlet
Claims (3)
焼室を有するクラウン部と、クラウン部より下方に延在
するスカート部と、クラウン部とスカート部の内周側に
設けられたピンボス部と、およびクラウン部の内部に設
け且つ冷却用オイルの入口と出口とを有する環状のオイ
ルギャラリーとを有し、燃焼室中心がクラウン部中心に
対し偏心し、クラウン部の底面が前記偏心側で下方とな
る斜面とさせ前記偏心側のオイルギャラリーの断面を大
とさせる鋳鉄製ピストン。1. A crown portion having a piston ring groove on the outer peripheral surface and a combustion chamber on the top surface, a skirt portion extending below the crown portion, and a pin boss portion provided on the inner peripheral side of the crown portion and the skirt portion. And an annular oil gallery provided inside the crown portion and having an inlet and an outlet for cooling oil, the center of the combustion chamber is eccentric with respect to the center of the crown portion, and the bottom surface of the crown portion is on the eccentric side. A cast iron piston having a downward slope and a large cross section of the oil gallery on the eccentric side.
ギャラリーの外周面から半径方向内方へと突出する山形
部を配する請求項１記載の鋳鉄製ピストン。2. The cast iron piston according to claim 1, wherein a chevron portion projecting radially inward from the outer peripheral surface of the oil gallery is arranged at the center of the inlet of the oil gallery.
ルギャラリーの内部に突出させる請求項２記載の鋳鉄製
ピストン。3. The cast iron piston according to claim 2, wherein the inner peripheral surface of the inlet of the oil gallery projects into the interior of the oil gallery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9046093A JPH06280676A (en) | 1993-03-26 | 1993-03-26 | Cast iron made piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9046093A JPH06280676A (en) | 1993-03-26 | 1993-03-26 | Cast iron made piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06280676A true JPH06280676A (en) | 1994-10-04 |
Family
ID=13999229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9046093A Pending JPH06280676A (en) | 1993-03-26 | 1993-03-26 | Cast iron made piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06280676A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004060546A1 (en) * | 2004-12-16 | 2006-06-29 | Ks Kolbenschmidt Gmbh | Cooling duct piston for internal combustion engine has circular cooling duct arranged in piston head with at least one inlet opening and one discharge opening with upper wall which rises monotonously and lower wall which falls monotonously |
| KR100774732B1 (en) | 2006-12-07 | 2007-11-08 | 현대자동차주식회사 | Gallery structure of piston |
| US7406941B2 (en) | 2004-07-21 | 2008-08-05 | Federal - Mogul World Wide, Inc. | One piece cast steel monobloc piston |
| JP2010059842A (en) * | 2008-09-03 | 2010-03-18 | Nissan Motor Co Ltd | Piston structure and oil jet system |
| CN102076936A (en) * | 2008-07-03 | 2011-05-25 | 沃尔沃拉斯特瓦格纳公司 | Piston for an internal combustion engine |
| JP2015526643A (en) * | 2012-08-31 | 2015-09-10 | 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 for internal combustion engine |
-
1993
- 1993-03-26 JP JP9046093A patent/JPH06280676A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7406941B2 (en) | 2004-07-21 | 2008-08-05 | Federal - Mogul World Wide, Inc. | One piece cast steel monobloc piston |
| DE102004060546A1 (en) * | 2004-12-16 | 2006-06-29 | Ks Kolbenschmidt Gmbh | Cooling duct piston for internal combustion engine has circular cooling duct arranged in piston head with at least one inlet opening and one discharge opening with upper wall which rises monotonously and lower wall which falls monotonously |
| KR100774732B1 (en) | 2006-12-07 | 2007-11-08 | 현대자동차주식회사 | Gallery structure of piston |
| CN102076936A (en) * | 2008-07-03 | 2011-05-25 | 沃尔沃拉斯特瓦格纳公司 | Piston for an internal combustion engine |
| US20140174384A1 (en) * | 2008-07-03 | 2014-06-26 | Volvo Lastvagnar Ab | Piston for an internal combustion engine |
| JP2010059842A (en) * | 2008-09-03 | 2010-03-18 | Nissan Motor Co Ltd | Piston structure and oil jet system |
| JP2015526643A (en) * | 2012-08-31 | 2015-09-10 | 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 for internal combustion engine |
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