JPS61215861A - Piston pin - Google Patents
Piston pinInfo
- Publication number
- JPS61215861A JPS61215861A JP5668085A JP5668085A JPS61215861A JP S61215861 A JPS61215861 A JP S61215861A JP 5668085 A JP5668085 A JP 5668085A JP 5668085 A JP5668085 A JP 5668085A JP S61215861 A JPS61215861 A JP S61215861A
- Authority
- JP
- Japan
- Prior art keywords
- piston pin
- hollow shape
- ceramic
- sintered
- solvent
- 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
- 239000000919 ceramic Substances 0.000 claims abstract description 18
- 239000002904 solvent Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000010791 quenching Methods 0.000 abstract description 3
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 230000035882 stress Effects 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000007569 slipcasting Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004421 molding of ceramic Methods 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/10—Connection to driving members
- F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
- F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、内燃機関のピストンピンであって、特に、
セラミックスによって成形されるものに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a piston pin for an internal combustion engine, in particular,
Regarding things molded from ceramics.
従来の技術
セラミックスは耐熱性に優れており、このようなセラミ
ックスの特性をいかして、内燃機関の各部品をセラミッ
クスで成形することが考えられている。ピストンピンも
その一つであるが、従来のセラミックスによって成形さ
れたピストンピンは、中空部を有しない中実形状である
。BACKGROUND OF THE INVENTION Ceramics have excellent heat resistance, and it has been considered to take advantage of these characteristics to mold each part of an internal combustion engine using ceramics. Piston pins are one such type, and conventional piston pins molded from ceramics have a solid shape without a hollow part.
発明が解決しようとする問題点
一般に、内燃機関の高出力及び高速回転化を図るために
は、往復動部分の重量を軽減することが必要であるが、
上記の如くセラミックスによって成形された中実形状の
ピストンピンでは、重量が重く、そのため、かかる高出
力・高速回転に対応し得ない不満がある。また、このよ
うに重量が重くなるとその作動時の慣性力が大となり、
これによって、ピストンピンに作用する引張応力や曲げ
応力が過大となって強度上の問題を生じる。かつ、同様
に慣性力が大きくなるから、ピストンピンの相手方例え
ば連接棒摺動面の摩耗が増大する結果となる。Problems to be Solved by the Invention Generally, in order to achieve high output and high speed rotation of an internal combustion engine, it is necessary to reduce the weight of reciprocating parts.
As described above, the solid piston pin made of ceramic is heavy and therefore cannot cope with such high output and high speed rotation. Also, as the weight increases, the inertia during operation increases.
As a result, the tensile stress and bending stress acting on the piston pin become excessive, resulting in strength problems. In addition, since the inertia force also increases, the wear of the piston pin's counterpart, for example, the sliding surface of the connecting rod, increases.
更に、セラミックスはその伸びが極めて小さいため、鉄
等の金属に比較して材料内部における気孔等の欠陥によ
る応力集中に対する感度が高い。Furthermore, since ceramics have extremely low elongation, they are more sensitive to stress concentration due to defects such as pores inside the material than metals such as iron.
それ故、ピストンピンが中実形状の場合は、それだけ該
ピストンピンの内部に欠陥を含有する確率が高くなり、
応力集中め問題から割れを誘発しやすくなる。加えて、
かかる中実形状の場合には、ピストンピン中心部と外周
部との間に密度差を生じやすく、かつ、セラミックスは
熱伝導率が小さいため中心部と外周部で熱膨張差を生じ
、その熱応力によって焼き割れを起こし易いという欠点
がある。Therefore, if the piston pin has a solid shape, the probability that the piston pin contains defects increases accordingly.
Cracks are more likely to occur due to stress concentration problems. In addition,
In the case of such a solid shape, a density difference is likely to occur between the center and the outer circumference of the piston pin, and since ceramics have low thermal conductivity, a difference in thermal expansion occurs between the center and the outer circumference, and the heat It has the disadvantage of being susceptible to quench cracking due to stress.
この発明は、かかる上記の欠点を解消して、軽量で、し
かも内部欠陥による強度低下や熱応力による焼き割れの
問題を解消したセラミックス製のピストンピンを提供す
ることを目的としている。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a piston pin made of ceramics that is lightweight and eliminates problems of reduced strength due to internal defects and cracking caused by thermal stress.
問題点を解決するための手段
上記の目的を達成するため、この発明のピストンピンは
、セラミックス粉末と溶媒又は溶剤からなる泥臭状原料
より中空形状に成形焼結したことを特徴とするものであ
る。Means for Solving the Problems In order to achieve the above object, the piston pin of the present invention is characterized in that it is molded and sintered into a hollow shape from a muddy raw material made of ceramic powder and a solvent or a solvent. .
実施例
以下、この発明の構成を図示の実施例に基づいて説明す
ると、図において、（］）はシリンダブロック、（２）
はシリンダヘッドを示している。シリンダブロック（１
）内には、シリンダライナ（３）が挿入され、このシリ
ンダライナ（３）内にピストン（４）が挿入されている
。ピストン（４）のスカート部にまたがってピストンピ
ン（５）が挿入され、このピストンピン（５）には、ス
カート内において連接棒（６）の小端部が連結されてい
る。（７）は、該連接棒（６）の大端部を連結するクラ
ンク軸である。また、シリンダヘッド（２）には、シリ
ンダライナ（３）内の燃焼室に臨ませて吸気弁（８）及
び排気弁（９）が取り付けられている。EXAMPLES Below, the configuration of the present invention will be explained based on the illustrated examples. In the figures, ( ]) indicates a cylinder block, (2)
indicates the cylinder head. Cylinder block (1
) A cylinder liner (3) is inserted into the cylinder liner (3), and a piston (4) is inserted into this cylinder liner (3). A piston pin (5) is inserted across the skirt of the piston (4), and a small end of a connecting rod (6) is connected to the piston pin (5) within the skirt. (7) is a crankshaft that connects the large end of the connecting rod (6). Further, an intake valve (8) and an exhaust valve (9) are attached to the cylinder head (2) so as to face the combustion chamber within the cylinder liner (3).
このような内燃機関の構造において、この発明では、上
記ピストンピン（５）を、セラミックス粉末と溶媒又は
溶剤からなる泥臭状原料によって中空形状に成形焼結さ
れるセラミックスによって成形するものである。このよ
うなセラミックスの中空成形はスリップキャスト法と呼
ばれている。また、かかるスリップキャスト法による成
形は、泥奨状セラミックス屋料の鋳込み、石膏型等によ
る水分の吸収、排泥、型解放、焼成、研磨等の工程から
なる。このようにして、スリップキャスト法によって得
られるピストンピン（５）は、図で示すように内部が中
空で、かつ、その両端部に一体に形成された蓋部（１０
） （１０）を有している。一般に、セラミックスは
変形に弱く筒状にすると変形による割れを生じ易く、そ
のため肉厚を大きクシテ剛性を高くしなければならない
が、このような両端蓋部（１０） （１０）を有する
ことによって剛性が増大するため、全体の肉厚を薄くし
てより軽量化を図り得る。この蓋部（１０）の一方には
、成形時において内部の泥奨抜きに利用される小さな自
然排出口（１１）が残置されている。In the structure of such an internal combustion engine, in the present invention, the piston pin (5) is formed from ceramics that is formed into a hollow shape and sintered using a mud-like raw material made of ceramic powder and a solvent or a solvent. This type of hollow molding of ceramics is called slip casting. In addition, forming by the slip casting method includes steps such as casting a mud-shaped ceramic material, absorbing moisture using a plaster mold, etc., draining mud, releasing the mold, firing, and polishing. In this way, the piston pin (5) obtained by the slip casting method is hollow inside and has lid parts (10
) (10). In general, ceramics are weak against deformation and if made into a cylindrical shape, cracks easily occur due to deformation, so the wall thickness must be increased and the rigidity must be increased. increases, so the overall wall thickness can be reduced to further reduce weight. A small natural discharge port (11) is left on one side of the lid (10), which is used to remove mud from the inside during molding.
発明の効果
この発明によるセラミックス製のピストンピンは、セラ
ミックス粉末と溶媒又は溶剤からなる泥臭状原料によっ
て成形焼結される中空形状であり、それ故従来の中実形
ピストンピンに比較しｔｉかに軽量で、往復動部分の重
量を軽減して、機関の高速及び高出力化に対応すること
が可能となる。Effects of the Invention The ceramic piston pin according to the present invention has a hollow shape that is formed and sintered using a mud-like raw material made of ceramic powder and a solvent or a solvent, and therefore has a smaller piston pin than a conventional solid piston pin. It is lightweight and reduces the weight of reciprocating parts, making it possible to respond to higher speeds and higher outputs of the engine.
しかも、このように軽量であることから慣性力が減少し
、機関の回転時に生じる引張応力や曲げ応力が減少して
これらに対する強度が大となるとともに、同様の理自か
ら、連接棒等相手方との摺動面における相手部材の摩耗
増大を減少できる。加えて、上記の如く成形される中空
ピストンピンは、その両端に蓋部を備えているため筒状
のものに比較して剛性が高く、全体の肉厚を薄くするこ
とにより軽量化を図ることができる。更には、上記の如
く中空であるため内部欠陥を含有する確率が少なく、そ
のため応力集中による割れや、中心部と外周部との間の
密度差及び熱膨張差による焼き割れを起こす危険性が減
少する。Furthermore, since it is lightweight, inertia force is reduced, and the tensile stress and bending stress that occur when the engine rotates are reduced, increasing the strength against these stresses. Increased wear of the mating member on the sliding surface can be reduced. In addition, the hollow piston pin formed as described above has lids on both ends, so it has higher rigidity than a cylindrical one, and can be made lighter by reducing the overall wall thickness. Can be done. Furthermore, as mentioned above, since it is hollow, there is a low probability that it will contain internal defects, which reduces the risk of cracking due to stress concentration and quenching cracking due to the density difference and thermal expansion difference between the center and the outer periphery. do.
図面は、本発明のピストンピンを用いた内燃機関の要部
縦断面図である。
（５）・・・ピストンピン。The drawing is a longitudinal sectional view of a main part of an internal combustion engine using the piston pin of the present invention. (5)...Piston pin.
Claims (1)
り中空形状に成形焼結したことを特徴とするピストンピ
ン。A piston pin characterized in that it is molded and sintered into a hollow shape from a mud-shaped raw material made of ceramic powder and a solvent or a solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5668085A JPS61215861A (en) | 1985-03-20 | 1985-03-20 | Piston pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5668085A JPS61215861A (en) | 1985-03-20 | 1985-03-20 | Piston pin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61215861A true JPS61215861A (en) | 1986-09-25 |
Family
ID=13034138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5668085A Pending JPS61215861A (en) | 1985-03-20 | 1985-03-20 | Piston pin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61215861A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01105068A (en) * | 1987-10-19 | 1989-04-21 | Yamaha Motor Co Ltd | Piston pin |
| JPH02124363U (en) * | 1989-03-23 | 1990-10-12 | ||
| JPH0861499A (en) * | 1994-11-10 | 1996-03-08 | Ngk Spark Plug Co Ltd | Manufacture of ceramic piston pin |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS585454A (en) * | 1981-06-24 | 1983-01-12 | エムテ−ユ−・モトラン−ウント・タ−ビナン−ユニオン・ミユンヘン・ゲ−エムベ−ハ− | Piston for internal combustion engine |
-
1985
- 1985-03-20 JP JP5668085A patent/JPS61215861A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS585454A (en) * | 1981-06-24 | 1983-01-12 | エムテ−ユ−・モトラン−ウント・タ−ビナン−ユニオン・ミユンヘン・ゲ−エムベ−ハ− | Piston for internal combustion engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01105068A (en) * | 1987-10-19 | 1989-04-21 | Yamaha Motor Co Ltd | Piston pin |
| JPH02124363U (en) * | 1989-03-23 | 1990-10-12 | ||
| JPH0861499A (en) * | 1994-11-10 | 1996-03-08 | Ngk Spark Plug Co Ltd | Manufacture of ceramic piston pin |
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