JP2669888B2 - Cooling mechanism of piston for internal combustion engine - Google Patents
Cooling mechanism of piston for internal combustion engineInfo
- Publication number
- JP2669888B2 JP2669888B2 JP1086893A JP8689389A JP2669888B2 JP 2669888 B2 JP2669888 B2 JP 2669888B2 JP 1086893 A JP1086893 A JP 1086893A JP 8689389 A JP8689389 A JP 8689389A JP 2669888 B2 JP2669888 B2 JP 2669888B2
- Authority
- JP
- Japan
- Prior art keywords
- oil
- piston
- supply port
- cooling mechanism
- internal combustion
- 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.)
- Expired - Lifetime
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)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、シリンダボア下端部に取り付けられたオイ
ルジェットから噴出されるオイルをピストン頭部に形成
されたリング状の油路に導くことによってピストン頭部
を冷却するようにした内燃機関用ピストンの冷却機構に
関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a piston by guiding oil ejected from an oil jet attached to the lower end of a cylinder bore to a ring-shaped oil passage formed in the piston head. The present invention relates to a piston cooling mechanism for an internal combustion engine that cools the head.
（従来の技術） この種の冷却機構は、例えば熱負荷の高いターボチャ
ージャ付のエンジンに採用されるが、その具体的な構成
を第４図に示す。(Prior Art) This type of cooling mechanism is adopted in, for example, an engine with a turbocharger having a high heat load, and its specific configuration is shown in FIG.
即ち、第４図は従来の冷却機構を示す断面図であり、
図示のようにピストン103の頭部にはリング状の油路106
が形成されており、該油路106からはオイル供給口107と
オイル排出口108が下方に向かって開口している。That is, FIG. 4 is a sectional view showing a conventional cooling mechanism,
As shown in the figure, a ring-shaped oil passage 106 is provided on the head of the piston 103.
Is formed, and an oil supply port 107 and an oil discharge port 108 open downward from the oil passage 106.
而して、不図示のオイルポンプに連通するオイルジェ
ット112から前記オイル供給口107に向かってオイルを噴
出すれば、このオイルはオイル供給口107から前記油路1
06に導入され、該油路106を流れてピストン103の頭部を
冷却した後、前記オイル排出口108から排出されて落下
する。When oil is jetted from the oil jet 112 communicating with an oil pump (not shown) toward the oil supply port 107, the oil is discharged from the oil supply port 107 to the oil passage 1
After being introduced into 06, it flows through the oil passage 106 to cool the head of the piston 103, and then it is discharged from the oil discharge port 108 and falls.
（発明が解決しようとする課題） しかしながら、上記従来の冷却機構にあっては、オイ
ルジェット112から噴出される全てのオイルがオイル供
給口107から油路106に効率良く導かれる訳ではなく、一
部のオイルは逆流して落下するため、油路106を流れて
ピストン103の冷却に供されるオイルの量が不足し、ピ
ストン103の頭部が十分冷却されないという問題があっ
た。(Problems to be Solved by the Invention) However, in the above conventional cooling mechanism, not all the oil ejected from the oil jet 112 is efficiently guided to the oil passage 106 from the oil supply port 107. There is a problem that the head portion of the piston 103 is not sufficiently cooled because the amount of the oil that flows through the oil passage 106 and is used for cooling the piston 103 is insufficient because the oil in the part flows backward and drops.
従って、ピストン103を十分冷却するには、逆流する
オイルの量を見込んで余分な量のオイルを供給する必要
があり、オイルポンプの供給能力を上げねばならないと
いう問題があった。Therefore, in order to sufficiently cool the piston 103, it is necessary to supply an extra amount of oil in anticipation of the amount of oil that flows backward, and there is a problem that the supply capacity of the oil pump must be increased.
本発明は上記問題に鑑みてなされたもので、その目的
とする処は、必要最小量のオイルをピストン頭部に形成
された油路に効率良く導くことによってピストンの効果
的な冷却を行なうとともに、オイルポンプの供給能力を
下げることができる内燃機関用ピストンの冷却機構を提
供することにある。The present invention has been made in view of the above problems, and an object thereof is to effectively guide a minimum amount of oil to an oil passage formed in a piston head, thereby effectively cooling the piston. An object of the present invention is to provide a piston cooling mechanism for an internal combustion engine that can reduce the supply capacity of an oil pump.
（課題を解決するための手段） 上記目的を達成するため、本発明は、ピストン頭部に
内周壁に沿うリング状の厚肉部を形成し、該厚肉部にリ
ング状の油路を形成し、該油路からはオイル供給口とオ
イル排出口を下方に向かって開口せしめ、シリンダボア
下端部に取り付けられたオイルジェットから前記オイル
供給口に向かってオイルを噴出せしめるようにした内燃
機関用ピストンの冷却機構において、前記オイル供給口
に、前記オイルジェットから噴出するオイルの圧力によ
って開いて前記油路側へのオイルの供給のみを許容する
逆止弁を設けたことを特徴とする。(Means for Solving the Problem) In order to achieve the above object, the present invention forms a ring-shaped thick portion along an inner peripheral wall in a piston head, and forms a ring-shaped oil passage in the thick portion. A piston for an internal combustion engine in which an oil supply port and an oil discharge port are opened downward from the oil passage, and oil is jetted from an oil jet attached to the lower end of the cylinder bore toward the oil supply port. In the above cooling mechanism, the oil supply port is provided with a check valve which is opened by the pressure of the oil ejected from the oil jet and allows only the oil supply to the oil passage side.
（作用） 本発明によれば、オイル供給口に設けられた逆止弁に
よってオイルの逆流と落下が防がれるため、オイルジェ
ットから噴出されたオイルが逆止弁を経て効率良く油路
に導かれてピストンの冷却に供され、ピストンは必要最
小量のオイルで効果的に冷却される。(Operation) According to the present invention, the check valve provided at the oil supply port prevents the oil from flowing back and falling, so that the oil ejected from the oil jet is efficiently guided to the oil passage through the check valve. The piston is cooled to be cooled, and the piston is effectively cooled with the minimum amount of oil required.
又、ピストン側へは必要最小量のオイルを供給すれば
足るため、オイルポンプの供給能力（容量）を必要以上
に高める必要がない。Further, since it is sufficient to supply the required minimum amount of oil to the piston side, it is not necessary to increase the supply capacity (capacity) of the oil pump more than necessary.
（実施例） 以下に本発明の一実施例を添付図面に基づいて説明す
る。(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図は本発明に係る冷却機構を備える内燃機関用ピ
ストンの側断面図、第２図は第１図Ａ部の拡大詳細図、
第３図（ａ），（ｂ）は逆止弁の閉状態、開状態を示す
斜視図である。1 is a side sectional view of a piston for an internal combustion engine equipped with a cooling mechanism according to the present invention, FIG. 2 is an enlarged detailed view of part A in FIG. 1,
3 (a) and 3 (b) are perspective views showing a closed state and an open state of the check valve.
第１図に示すように、エンジンのシリンダボディ１に
形成されたシリンダボア２内にはピストン３が上下摺動
自在に嵌装されており、該ピストン３にはコンロッド４
の小端部がピストンピン５を介して連結されており、コ
ンロッド４の大端部はピストン３の下方に回転自在に配
される不図示のクランク軸に連結されている。尚、本実
施例に係るエンジンはターボチャージャ（図示せず）を
備えている。As shown in FIG. 1, a piston 3 is vertically slidably fitted in a cylinder bore 2 formed in a cylinder body 1 of an engine, and a connecting rod 4 is attached to the piston 3.
Is connected via a piston pin 5, and the large end of the connecting rod 4 is connected to a crankshaft (not shown) rotatably arranged below the piston 3. The engine according to this embodiment includes a turbocharger (not shown).
ところで、ピストン３の頭部には内周壁に沿うリング
状の厚肉部3aが一体に形成されており、この厚肉部3aに
はリング状の油路６が形成されている。そして、この油
路６からはオイル供給口７とオイル排出口７が下方に向
かって開口しており、オイル供給口７には、第２図に詳
細に示すように、耐熱性の高い金属又は樹脂で成形され
た逆止弁９がカシメによって取り付けられている。By the way, the head of the piston 3 is integrally formed with a ring-shaped thick portion 3a along the inner peripheral wall, and a ring-shaped oil passage 6 is formed in the thick portion 3a. An oil supply port 7 and an oil discharge port 7 open downward from the oil passage 6, and the oil supply port 7 has a high heat-resistant metal or metal, as shown in detail in FIG. A check valve 9 made of resin is attached by caulking.
上記逆止弁９は油路６側へのオイルの供給を許容する
ものであって、これは第３図に示すように三角形の撓曲
自在な４つのリード9a…を有しており、閉弁時には同図
（ａ）に示すようにリード9a…がその弾性によって閉じ
ている。そして、該逆止弁９は後述のオイルジェット12
から噴出されるオイルの圧力によって第３図（ｂ）に示
すように開き、下方から供給されるオイルを前記油路６
に導く。The check valve 9 allows the supply of oil to the oil passage 6 side, and has four triangular flexible leads 9a ... As shown in FIG. At the time of valve operation, the leads 9a ... Are closed due to their elasticity as shown in FIG. The check valve 9 is provided with an oil jet 12 which will be described later.
As shown in FIG. 3 (b), the pressure of the oil jetted from the open causes the oil supplied from below to open in the oil passage 6.
Lead to.
一方、前記シリンダボディ１には油路10が第１図の紙
面垂直方向に形成されており、該油路10には逆止弁11を
介してオイルジェット12が接続されている。そして、こ
のオイルジェット12の先部はピストン３の下方において
該ピストン３に開口する前記オイル供給口７に向かって
開口している。On the other hand, an oil passage 10 is formed in the cylinder body 1 in a direction perpendicular to the paper surface of FIG. 1, and an oil jet 12 is connected to the oil passage 10 via a check valve 11. The tip of the oil jet 12 opens below the piston 3 toward the oil supply port 7 that opens into the piston 3.
尚、油路10は不図示のオイルポンプの吐出側に接続さ
れている。又、前記逆止弁11は、油路10内の圧力が所定
値以上のとき（即ち、ピストン３の熱負荷が大きいエン
ジン高回転時）に開いて油路10内のオイルをオイルジェ
ット12側へ流すものであり、エンジン低回転時には閉じ
てオイル圧力の低下を防いでいる。The oil passage 10 is connected to the discharge side of an oil pump (not shown). Further, the check valve 11 is opened when the pressure in the oil passage 10 is equal to or higher than a predetermined value (that is, when the engine 3 is rotating at a high engine speed where the heat load of the piston 3 is large), and the oil in the oil passage 10 is discharged to the oil jet 12 side. The oil is drained to the engine and is closed at low engine speeds to prevent a drop in oil pressure.
而して、ピストン３の熱負荷が高くなるエンジン高回
転時には、上述のように逆止弁11が開いて油路10内のオ
イルをオイルジェット12側へ導くため、オイルはオイル
ジェット12からピストン３のオイル供給口７に向かって
勢い良く噴出し、その圧力で逆止弁９を押し開いて油路
６へ流入する。このとき、このオイルのオイル供給口７
における逆流及び落下は逆止弁９によって確実に防がれ
るため、オイルジェット12から噴出されるオイルは逆止
弁９を経て効率良く油路６に導かれてピストン３の冷却
に供され、ピストン３は必要最少量のオイルで効果的に
冷却される。そして、ピストン３の頭部を冷却したオイ
ルは、オイル排出口８から不図示のクランクケース下部
に落下し、オイルポンプに吸引されて再び各部の潤滑及
び冷却に供される。Thus, at the time of high engine speed where the heat load of the piston 3 becomes high, the check valve 11 opens and guides the oil in the oil passage 10 to the oil jet 12 side as described above. It jets vigorously toward the oil supply port 7 of No. 3, and the check valve 9 is pushed open by the pressure and flows into the oil passage 6. At this time, the oil supply port 7 for this oil
Since the check valve 9 reliably prevents backflow and drop, the oil jetted from the oil jet 12 is efficiently guided to the oil passage 6 through the check valve 9 to be used for cooling the piston 3, 3 is effectively cooled with the minimum amount of oil required. Then, the oil that has cooled the head of the piston 3 drops from the oil discharge port 8 to the lower part of the crankcase (not shown), is sucked by the oil pump, and is again used for lubrication and cooling of each part.
又、前述のように逆止弁９によってオイル供給口７で
の逆流及び落下が防がれる結果、ピストン３へは必要最
少量のオイルを供給すれば足ることとなり、オイルポン
プの供給能力（容量）を必要以上に高める必要がなくな
る。Further, as described above, the check valve 9 prevents the reverse flow and the drop at the oil supply port 7, and as a result, it is sufficient to supply the piston 3 with the necessary minimum amount of oil. ) Need not be raised more than necessary.
（発明の効果） 以上の説明で明らかなように、本発明によれは、ピス
トン頭部に内周壁に沿うリング状の厚肉部を形成し、該
厚肉部にリング状の油路を形成し、該油路からはオイル
供給口とオイル排出口を下方に向かって開口せしめ、シ
リンダボア下端部に取り付けられたオイルジェットから
前記オイル供給口に向かってオイルを噴出せしめるよう
にした内燃機関用ピストンの冷却機構において、前記オ
イル供給口に、前記オイルジェットから噴出するオイル
の圧力によって開いて前記油路側へのオイルの供給のみ
を許容する逆止弁を設けたため、必要最少量のオイルを
ピストン頭部に形成された油路に効率良く導くことがで
き、ピストンの効果的な冷却を行なうことができるとと
もに、オイルポンプの供給能力を下げることができると
いう効果が得られる。(Effect of the Invention) As is apparent from the above description, according to the present invention, a ring-shaped thick portion is formed on the piston head along the inner peripheral wall, and a ring-shaped oil passage is formed in the thick portion. A piston for an internal combustion engine in which an oil supply port and an oil discharge port are opened downward from the oil passage, and oil is jetted from an oil jet attached to the lower end of the cylinder bore toward the oil supply port. In the cooling mechanism, the oil supply port is provided with a check valve that opens by the pressure of the oil jetted from the oil jet and allows only the oil to be supplied to the oil passage side. It can be efficiently guided to the oil passage formed in the section, effective cooling of the piston can be performed, and the supply capacity of the oil pump can be reduced. The effect is obtained.
第１図は本発明に係る冷却機構を備える内燃機関用ピス
トンの側断面図、第２図は第１図Ａ部の拡大詳細図、第
３図（ａ），（ｂ）は逆止弁の閉状態、開状態を示す斜
視図、第４図は従来の内燃機関用ピストンの冷却機構を
示す断面図である。 ２……シリンダボア、３……ピストン、3a……厚肉部、
６……油路、７……オイル供給口、８……オイル排出
口、９……逆止弁、12……オイルジェット。FIG. 1 is a side sectional view of a piston for an internal combustion engine equipped with a cooling mechanism according to the present invention, FIG. 2 is an enlarged detailed view of part A in FIG. 1, and FIGS. 3 (a) and 3 (b) are check valves. FIG. 4 is a perspective view showing a closed state and an open state, and FIG. 4 is a sectional view showing a conventional cooling mechanism for an internal combustion engine piston. 2 ... Cylinder bore, 3 ... Piston, 3a ... Thick wall part,
6 ... Oil passage, 7 ... Oil supply port, 8 ... Oil discharge port, 9 ... Check valve, 12 ... Oil jet.
Claims (1)
肉部を形成し、該厚肉部にリング状の油路を形成し、該
油路からはオイル供給口とオイル排出口を下方に向かっ
て開口せしめ、シリンダボア下端部に取り付けられたオ
イルジェットから前記オイル供給口に向かってオイルを
噴出せしめるようにした内燃機関用ピストンの冷却機構
において、 前記オイル供給口に、前記オイルジェットから噴出する
オイルの圧力によって開いて前記油路側へのオイルの供
給のみを許容する逆止弁を設けたことを特徴とする内燃
機関用ピストンの冷却機構。1. A ring-shaped thick portion is formed on the piston head along the inner peripheral wall, and a ring-shaped oil passage is formed in the thick portion, and an oil supply port and an oil discharge port are formed from the oil passage. In a cooling mechanism for a piston for an internal combustion engine, which is configured to open downward and eject oil from an oil jet attached to a lower end of a cylinder bore toward the oil supply port, the oil supply port is provided with an oil jet from the oil jet. A cooling mechanism for a piston for an internal combustion engine, comprising a check valve which is opened by the pressure of jetted oil and allows only the supply of oil to the oil passage side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1086893A JP2669888B2 (en) | 1989-04-07 | 1989-04-07 | Cooling mechanism of piston for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1086893A JP2669888B2 (en) | 1989-04-07 | 1989-04-07 | Cooling mechanism of piston for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02267349A JPH02267349A (en) | 1990-11-01 |
| JP2669888B2 true JP2669888B2 (en) | 1997-10-29 |
Family
ID=13899518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1086893A Expired - Lifetime JP2669888B2 (en) | 1989-04-07 | 1989-04-07 | Cooling mechanism of piston for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2669888B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040005201A (en) * | 2002-07-09 | 2004-01-16 | 현대자동차주식회사 | Cooling apparatus for Piston |
| DE102009039217A1 (en) * | 2009-08-28 | 2011-03-03 | Mahle International Gmbh | Piston for internal combustion engine, has piston head and hub bore holes with piston shaft, where cooling channel is arranged in piston head |
| DE102020000318A1 (en) | 2020-01-21 | 2021-07-22 | Ford Global Technologies, Llc | Internal combustion engine with piston cooling and method for producing an associated piston |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58137852U (en) * | 1982-03-12 | 1983-09-16 | ヤンマーディーゼル株式会社 | Piston with cooling cavity |
-
1989
- 1989-04-07 JP JP1086893A patent/JP2669888B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02267349A (en) | 1990-11-01 |
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