JPH0278754A - Piston of internal combustion engine - Google Patents
Piston of internal combustion engineInfo
- Publication number
- JPH0278754A JPH0278754A JP22986088A JP22986088A JPH0278754A JP H0278754 A JPH0278754 A JP H0278754A JP 22986088 A JP22986088 A JP 22986088A JP 22986088 A JP22986088 A JP 22986088A JP H0278754 A JPH0278754 A JP H0278754A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- pin
- hole
- pin boss
- offset
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 7
- 229910001234 light alloy Inorganic materials 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 abstract description 8
- 238000005520 cutting process Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はピストンピンのオフセットする場合に、ピス
トンのピストンボスの加工が容易にできてピストンの生
産性もよい内燃ｍ関のピストンに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piston for an internal combustion engine in which the piston boss of the piston can be easily machined and the productivity of the piston can be improved when the piston pin is offset.
内燃ｌ！閏のピストンは、軽合金でコツプ状に鋳造し、
内側左右に突設したピンボスのピン孔に、コネクチング
ロッドの小端を軸着したピストンピンを挿入して連結し
ている。コネクチングロッドの大端はクランクピンに軸
着し、ピストンがシリンダー内を往復運動するのをクラ
ンク軸の回転運動に変換している。例えば、実開昭６０
−１１６４６２号公報、実開昭６２−９７５７号公報参
照。ところで、ピストンは、鋳造するときに、第３図及
び第４図に示すように、軽合金でコツプ状に鋳造するピ
ストンＡの内側左右にピンボスＢを一体鋳造し、ピンボ
ス８部分には、ピストンピンを挿入する下孔Ｃを設ける
と共に、下孔Ｃの内端に面取りＤを設けて鋳造し、下孔
Ｃ部分をドリル加工で精密に加工してピン孔Ｅとし、ピ
ストンピンを挿入するようにしている。面取りＤ′４ｒ
設けるのは、ドリルを通して切削するときに端部にでき
るパリを少なくするものである。ピン孔Ｅと下孔Ｃが同
芯であれば、面取りＤは小さくてよい。Internal combustion! The leap piston is made of light alloy and cast in a small shape.
A piston pin, with the small end of the connecting rod pivoted, is inserted into the pin hole of the pin boss protruding from the left and right sides of the inside for connection. The large end of the connecting rod is pivotally attached to the crank pin, converting the reciprocating movement of the piston within the cylinder into rotational movement of the crankshaft. For example, in the 1980s
See Japanese Utility Model Application Publication No. 116462 and Japanese Utility Model Application No. 62-9757. By the way, when the piston is cast, as shown in FIGS. 3 and 4, pin bosses B are integrally cast on the left and right sides of the inside of the piston A, which is cast in a small shape from a light alloy. In addition to providing a pilot hole C for inserting the pin, a chamfer D is provided on the inner end of the pilot hole C, which is then cast, and the pilot hole C is precisely drilled to form a pin hole E, into which the piston pin is inserted. I have to. Chamfer D'4r
The purpose of this is to reduce the burrs that form at the edges when cutting through the drill. If the pin hole E and the pilot hole C are concentric, the chamfer D may be small.
ところが、ピストンＡの頂面は燃焼室に面していて、爆
発圧力を直接受け、燃焼室の形状によっては、均一な圧
力がピストン八に加わらず、ピストン八を傾けるような
力が発生することがある。このようなときには、切削加
工するピン孔ＥをＦで示すようにオフセットして、補正
し、ピストン八を傾けるような力を除いて、ピストン八
がシリンダー壁面を叩くスラップ音が発生しないように
している。例えば、特開昭５８−１８７５５８号公報参
照。ピン孔ＥをＦのようにオフセットすると、面取りＤ
が小さい場合には、面取りＤから外れる部分ができて、
切削パリの発生が多くなり、手仕事などでパリ除去をす
ることになって手数がかかる。これを除くため、当初か
ら面取りＤをＧで示すように大きくしておけば、Ｆのよ
うにオフセットしても、面取りＧから外れることがない
。しかし、面取りＧのように大きくすると、ピンボスＢ
の先端部分が肉薄になる。この部分は、鋳造時に湯口か
ら遠い部分に当り、肉薄になると製法れが悪くなって鋳
造不良が発生する。オフセットに合せて鋳型を作るので
は、鋳型を多数必要とし、鋳造したピストンもオフセッ
ト寸法に合せて管理する必要が生じ、生産性が悪く不経
済でコスト高になり、実用的でない。However, the top surface of piston A faces the combustion chamber and receives the explosion pressure directly, and depending on the shape of the combustion chamber, even pressure may not be applied to piston 8, and a force that tilts piston 8 may be generated. There is. In such a case, offset the pin hole E to be cut as shown by F to correct it, and remove the force that tilts the piston 8 to prevent the slapping sound of the piston 8 hitting the cylinder wall. There is. For example, see Japanese Patent Application Laid-Open No. 187558/1983. If the pin hole E is offset like F, the chamfer D
If is small, there will be a part that deviates from the chamfer D,
The occurrence of cutting burrs increases, and burrs must be removed by hand, which is time-consuming. In order to eliminate this, if the chamfer D is made large from the beginning as shown by G, even if it is offset like F, it will not deviate from the chamfer G. However, if the chamfer G is made larger, the pin boss B
The tip becomes thinner. This part is far from the sprue during casting, and if it becomes thin, the manufacturing process will be poor and casting defects will occur. Making a mold according to the offset requires a large number of molds, and the cast piston also needs to be managed according to the offset dimensions, resulting in poor productivity, uneconomical production, high cost, and impractical.
この発明は、ピストンの鋳造時のＩｉ流れを損うことな
く、オフセット時にも面取りからピン孔が外れることが
なくて、パリの発生を少なくできて手作業をかけること
もなく、生産性がよくて安価にできる内燃！ｌ関のピス
トンを得るこくを目的とする。This invention does not impair the Ii flow during piston casting, the pin hole does not come off from the chamfer even during offset, reduces the occurrence of flashing, eliminates manual labor, and improves productivity. Internal combustion can be done cheaply! The purpose is to obtain a piston for the first time.
以下、本発明を第１図及び第２図に示す実施例によって
説明する。The present invention will be explained below with reference to the embodiments shown in FIGS. 1 and 2.
ピストン１は、軽合金を用いて鋳造によって成形するも
ので、内側左右にピンボス２を一体に突出させて設ける
。そして、ピンボス２の部分には、下孔３を設けると共
に内端に面取り４を鋳造時に一体に設けておく。面取り
４は、上下方向を小さく、両側を太き（袂っである。下
孔３８１Ｓ分は、ドリル切削加工によって精密なピン孔
５とし、コネクチングロッドの小端を軸着したピストン
ピンを挿入して、ピストン１とコネクチングロッドを連
結する。ドリル加工のとき、オフセット量０で示すよう
にピン孔６のようにオフセットすることがある。The piston 1 is formed by casting using a light alloy, and is provided with pin bosses 2 integrally protruding from the left and right sides of the inside. A pilot hole 3 is provided in the pin boss 2 portion, and a chamfer 4 is integrally provided at the inner end during casting. The chamfer 4 is smaller in the vertical direction and thicker on both sides.The lower hole 381S is made into a precise pin hole 5 by drilling, and a piston pin with the small end of the connecting rod pivoted is inserted into the hole 381S. Then, connect the piston 1 and the connecting rod.During drilling, the pin hole 6 may be offset as shown by an offset amount of 0.
（発明の作用）
ピンボス２の内端に設ける面取り４は、上下方向を小さ
く両側を大きく袂ってあって、ピンボス２の先端の肉薄
にな仝個所は両側だけで少ないので、ピストン１の鋳造
時の瀉流れを確保できて、不良品ができることを防止で
きる。又、ピン孔５をピン孔６のようにオフセットＯし
てドリル切削加工しても、面取り４部分から外れること
がなく、切削パリの発生を少なくできて、取除きの手仕
事を省くことができる。(Function of the invention) The chamfer 4 provided at the inner end of the pin boss 2 is small in the vertical direction and widens on both sides, and the tip of the pin boss 2 has a thin wall on both sides only. It is possible to ensure the flow of time and prevent the production of defective products. In addition, even if the pin hole 5 is offset O like the pin hole 6 and drilled, it will not come off the chamfer 4, reducing the occurrence of cutting burrs and eliminating manual work for removal. can.
（発明の効果）
以上説明したように、この発明は、軽合金でコツプ形に
鋳造するピストンで、内側左右に横方向にピンボスを一
体に突出させて設け、ピンボスのピン孔にコネクチング
ロッドの小端孔を軸着したピストンピンを挿入して連結
するもので、両側のピンボス内端に、上下方向を小さ（
両側を大きく決った面取りを施したので、ピンボス先端
の肉薄になる部分が少なく、ピストンの鋳造時の１１流
れを確保できて、鋳造不良の発生を防止できる。そして
、ピン孔をドリル加工するときにオフセットさせても、
面取りから外れることがなく、切削パリを少な（できて
、加工を容易にできる。又、鋳型も少なくて済んで経済
的で部品管理も簡単にできて、コストダウンが図れる。(Effects of the Invention) As explained above, the present invention is a piston made of light alloy and cast in a round shape, with a pin boss integrally protruding laterally on the left and right sides of the inside, and a small connecting rod inserted into the pin hole of the pin boss. It is connected by inserting a piston pin with the end hole pivoted, and a small (vertical)
Since both sides are chamfered with a large predetermined chamfer, there is less thinning at the tip of the pin boss, ensuring flow during piston casting, and preventing casting defects. And even if you offset it when drilling the pin hole,
It does not come off the chamfer, and there are fewer cutting burrs, making processing easier. Also, fewer molds are required, making it economical and parts management easier, reducing costs.
第１図及び第２図は本発明の一実施例を示し、第１図は
縦断面図、
第２図は要部の拡大内側内因、
第３図及び第４図は従来例を示し、
第３図は横断面図、
第４図は要部の拡大内側面図である。
１・・・ピストン、２・・・ピンボス、４・・・面取り
、５・・・ピン孔、６・・・ピン孔。
出願人代理人 藤 本 傅 光第１図 ＄
２回
３３ 回 １４図1 and 2 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged internal cause of the main part, FIGS. 3 and 4 are a conventional example, and FIG. Figure 3 is a cross-sectional view, and Figure 4 is an enlarged internal side view of the main parts. 1... Piston, 2... Pin boss, 4... Chamfer, 5... Pin hole, 6... Pin hole. Applicant's agent Fumitsu Fujimoto Figure 1 $
2nd 33rd Figure 14
Claims (1)
方向にピンボスを一体に突出させて設け、ピンボスのピ
ン孔にコネクチングロッドの小端孔を軸着したピストン
ピンを挿入して連結するもので、両側のピンボス内端に
、上下方向を小さく両側を大きく抉った面取りを施した
ことを特徴とする内燃機関のピストン。A piston made of light alloy and cast into a cup shape, with a pin boss integrally protruding from the inside left and right, and connected by inserting a piston pin with the small end hole of the connecting rod pivoted into the pin hole of the pin boss. A piston for an internal combustion engine, characterized in that the inner ends of the pin boss on both sides are chamfered, with small chamfers in the vertical direction and large chamfers on both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22986088A JP2564623B2 (en) | 1988-09-16 | 1988-09-16 | Internal combustion engine pistons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22986088A JP2564623B2 (en) | 1988-09-16 | 1988-09-16 | Internal combustion engine pistons |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0278754A true JPH0278754A (en) | 1990-03-19 |
| JP2564623B2 JP2564623B2 (en) | 1996-12-18 |
Family
ID=16898828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22986088A Expired - Lifetime JP2564623B2 (en) | 1988-09-16 | 1988-09-16 | Internal combustion engine pistons |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2564623B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528077A (en) * | 1993-06-03 | 1996-06-18 | Kabushiki Kaisha Toshiba | Flexible tab semiconductor device |
| US20100065009A1 (en) * | 2008-09-17 | 2010-03-18 | Honda Motor Co., Ltd. | Piston and method for manufacturing the same |
| CN114320651A (en) * | 2021-12-07 | 2022-04-12 | 马勒汽车技术（中国）有限公司 | Piston blank, steel piston and method for machining steel piston pin boss without burrs |
-
1988
- 1988-09-16 JP JP22986088A patent/JP2564623B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528077A (en) * | 1993-06-03 | 1996-06-18 | Kabushiki Kaisha Toshiba | Flexible tab semiconductor device |
| US20100065009A1 (en) * | 2008-09-17 | 2010-03-18 | Honda Motor Co., Ltd. | Piston and method for manufacturing the same |
| US8601994B2 (en) * | 2008-09-17 | 2013-12-10 | Honda Motor Co., Ltd | Piston and method for manufacturing the same |
| CN114320651A (en) * | 2021-12-07 | 2022-04-12 | 马勒汽车技术（中国）有限公司 | Piston blank, steel piston and method for machining steel piston pin boss without burrs |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2564623B2 (en) | 1996-12-18 |
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