JPH0451661B2 - - Google Patents
Info
- Publication number
- JPH0451661B2 JPH0451661B2 JP59018520A JP1852084A JPH0451661B2 JP H0451661 B2 JPH0451661 B2 JP H0451661B2 JP 59018520 A JP59018520 A JP 59018520A JP 1852084 A JP1852084 A JP 1852084A JP H0451661 B2 JPH0451661 B2 JP H0451661B2
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- sliding surface
- surface coating
- light metal
- piston
- 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
- 239000002345 surface coating layer Substances 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 239000003779 heat-resistant material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000005474 detonation Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000000576 coating method Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010410 layer Substances 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
- F16J1/02—Bearing surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Physical Vapour Deposition (AREA)
Description
【発明の詳細な説明】
本発明は、（特に重由で運転される）内燃機関
用の軽金属ピストンであつて、摩滅の少ない耐熱
性の材料から成る薄い摺動面被覆層を有している
形式のものに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention is a light metal piston for internal combustion engines (particularly those operated under heavy pressure) having a thin sliding surface coating of a low-wear, heat-resistant material. Regarding formal matters.
摺動面被覆層を有する軽金属ピストンは例えば
***国実用新案第1509586号明細書により公知で
ある。従来公知のすべての摺動面被覆層は少なく
ともトツプランドの全周面にわたつて中断するこ
となく延びていて軽金属ピストンの耐摩滅性の表
皮を形成する。しかしながら、試験機関における
実験では中断されない前述のような摺動面被覆層
は重由運転に適していないことがわかつた。それ
というのは、摺動面被覆層が燃焼室内の温度及び
圧力比の著しく高いかつ燃焼残留物の影響を及ぼ
す困難な重由運転条件下では維持されず、ある一
定の耐用年数の後に重由運転条件の影響により破
れるか若しくは全く剥がれるからである。 Light metal pistons with a sliding surface coating are known, for example, from German Utility Model No. 1509586. All sliding surface coatings known to date extend without interruption over at least the entire circumference of the top plate and form a wear-resistant skin of the light metal piston. However, experiments in test laboratories have shown that the above-mentioned uninterrupted sliding surface coating layer is not suitable for heavy-duty operation. This is because the sliding surface coating is not maintained under difficult heavy-duty operating conditions with extremely high temperatures and pressure ratios in the combustion chamber and with the influence of combustion residues, and after a certain service life it becomes obsolete. This is because it may tear or completely peel off depending on the operating conditions.
従つて本発明の目的は、摺動面被覆層を有する
軽金属ピストンを改善して、重由運転の困難な条
件下でも長い耐用年数が得られるようにすること
である。 It is therefore an object of the present invention to improve a light metal piston with a sliding surface coating so that it has a long service life even under difficult conditions of heavy duty operation.
この目的を達成するために本発明の構成では、
摺動面被覆層がもつぱらトツプランドに、それも
ピストンの軸線方向で中断されてトツプランドの
周面を部分的に露出させることによつて、換言す
ればピストンの軸線方向で部分的に帯状の露出面
を残すことによつて互いに間隔を置いて位置する
環状の複数の帯状区域を形成するように設けられ
ている。 In order to achieve this objective, the configuration of the present invention includes:
By partially exposing the circumferential surface of the top land of the sliding surface coating layer, which is also interrupted in the axial direction of the piston, in other words, it is partially exposed in a band-like manner in the axial direction of the piston. It is provided to form a plurality of annular strips spaced apart from each other by leaving a surface.
本発明の前記構成により効果として、摺動面被
覆層が温度分布、ひいては応力分布に応じて（高
い温度部分と低い温度分布とに）分割してあるこ
とに基づき、高い温度、ひいては大きい応力を受
ける被覆層区分（トツプランド２の上端部の帯状
区域）と低い温度、ひいては小さい応力しか受け
ない被覆層区分（トツプランドの下端部の帯状区
域）との間の不都合な相互作用が遮断され、その
結果トツプランドの周面を全体的に被う摺動面被
覆層において生じているような亀裂や剥離が確実
に防止される。 The above-mentioned structure of the present invention has the advantage that the sliding surface coating layer is divided according to temperature distribution and stress distribution (into a high temperature portion and a low temperature distribution), so that high temperature and high stress can be avoided. Unfavorable interactions between the covering layer section (strip area at the upper end of the totsprand 2) which is subjected to lower temperatures and therefore only lower stresses (strip area at the lower end of the toss plank 2) are blocked, and as a result Cracks and peeling that occur in the sliding surface coating layer that entirely covers the circumferential surface of the toppland are reliably prevented.
本発明の有利な実施態様が特許請求の範囲第２
項以下に記載してある。 Advantageous embodiments of the invention are defined in claim 2.
It is described below.
次に図面を用いて本発明の実施例を具体的に説
明する。 Next, embodiments of the present invention will be specifically described using the drawings.
図面には（特に重由で運転される）内燃機関の
軽金属ピストンが符号１でかつ軽金属ピストンの
トツプランドが符号２で示してある。軽金属ピス
トン１には、摩滅の少ない耐熱性の材料から成る
摺動面被覆層が設けられており、この摺動面被覆
層は本発明に基づきもつらトツプランド２に、そ
れもピストンの軸線方向で部分的に帯状の露出面
４を残すことによつて互いに間隔を置いて位置す
る環状の複数の帯状区分３を形成するように設け
られている。第１図の実施例ではトツプランドに
環状に延びる２つの帯状区分３が設けられてお
り、この場合には上方の帯状区域はピストンヘツ
ド端面５に隣接し、かつ下方の帯状区域は最上段
のピストンリング溝７の上縁６に隣接している。
トツプランド２の周面に第２図の実施例では３つ
の帯状区域３が設けられ、第３図の実施例では４
つの帯状区域３が設けられている。 In the drawing, a light metal piston of an internal combustion engine (in particular for heavy duty operation) is designated by the reference numeral 1 and a top plate of the light metal piston is designated by the reference numeral 2. The light metal piston 1 is provided with a sliding surface coating layer made of a heat-resistant material with low abrasion, and this sliding surface coating layer is applied to the flat top land 2 according to the invention, also in the axial direction of the piston. By leaving partially exposed strip-shaped surfaces 4, a plurality of annular strip-shaped sections 3 are provided which are spaced apart from each other. In the embodiment according to FIG. 1, the top plate is provided with two annularly extending strip sections 3, the upper strip section adjoining the piston head end face 5 and the lower strip section on the top piston. It is adjacent to the upper edge 6 of the ring groove 7.
In the embodiment of FIG. 2, three strip-shaped regions 3 are provided on the circumference of the top land 2, and in the embodiment of FIG.
Two strip areas 3 are provided.
帯状区域３は有利には全周にわたつて一様な幅
を有している。各帯状区域は、第１図及第３図に
示すように互いに同じ幅を有するか、若しくは第
２図に示すように互いに異なる幅を有しており、
第２図の実施例では各帯状区域３の幅は有利には
ピストンヘツド端面５からトツプランドの下端部
に向かつて増大している。帯状区域は必ずらしも
全周にわたつて一様な幅を有していなればならな
いものではない。 The strip 3 preferably has a uniform width over its entire circumference. Each strip has the same width as shown in FIGS. 1 and 3, or different widths as shown in FIG.
In the embodiment of FIG. 2, the width of each strip 3 advantageously increases from the piston head end face 5 towards the lower end of the top plate. The strip area does not necessarily have to have a uniform width all around.
すべての帯状区域３の摺動面被覆層をトツプラ
ンド２の周方向で中断なしに構成する必要は必ず
しもなく、第３図に示してあるように、トツプラ
ンド２の下端部に近い帯状区域３の摺動面被覆層
が１回若しくは複数回中断され、区域部分に分割
されていると有利である。中断箇所は符号８で示
してある。 It is not necessarily necessary to construct the sliding surface coating layer of all the strip areas 3 without interruption in the circumferential direction of the top land 2, and as shown in FIG. It is advantageous if the dynamic surface coating layer is interrupted one or more times and divided into sections. The interrupted point is indicated by the reference numeral 8.
摺動面被覆層は、あらかじめ鋳造によつて一体
成形されかつ表面加工されたピストンに、例えば
第１図、第２図及び第３図の形若しくはこれとは
異なる形で例えば65重量パーセントのクロムカー
バイト（Cr3C2）、残りはニツケル及びクロムか
ら成る材料を有利にはデトネーシヨン法で付着さ
せることにより形成される。このような材料及び
付着方法に、本発明に基づく摺動面被覆層の形成
は拘束されるのではなく、別の材料及び別の付着
方法若しくはプラズマ方法も使用され得る。被覆
層の厚さは使用例に関連しており；ほぼ300mmの
ピストン直径では厚さはほぼ80μmである。 The sliding surface coating layer is coated with, for example, 65% by weight of chromium in the shape shown in FIGS. It is formed by depositing a material consisting of carbide (Cr 3 C 2 ), the remainder nickel and chromium, preferably by a detonation process. The formation of the sliding surface coating layer according to the invention is not limited to such materials and deposition methods; other materials and deposition methods or plasma methods may also be used. The thickness of the coating layer is dependent on the application; for a piston diameter of approximately 300 mm, the thickness is approximately 80 μm.
図面は本発明の実施例を示すものであつて、第
１図は第１実施例の部分側面図、第２図は第２実
施例の部分側面図、第３図は第３実施例の部分側
面図である。
１……軽金属ピストン、２……トツプランド、
３……帯状区域、４……露出面、５……ピストン
ヘツド端面、６……上縁、７……ピストンリング
溝、８……中断箇所。
The drawings show embodiments of the present invention; FIG. 1 is a partial side view of the first embodiment, FIG. 2 is a partial side view of the second embodiment, and FIG. 3 is a partial side view of the third embodiment. FIG. 1... Light metal piston, 2... Totsuprand,
3...Band-shaped area, 4...Exposed surface, 5...Piston head end face, 6...Upper edge, 7...Piston ring groove, 8...Interruption point.
Claims (1)
の少ない耐熱性の材料から成る薄い摺動面被覆層
を有している形式のものにおいて、摺動面被覆層
がもつぱらトツプランド２に、それもピストンの
軸線方向で中断されてトツプランドの周面を部分
的に露出させることによつて互いに間隔を置いて
位置する環状の複数の帯状区域３を形成するよう
に設けられていることを特徴とする、内燃機関用
の軽金属ピストン。 ２ 摺動面被覆層としての上方の帯状区域３が直
接にピストンヘツド端面５に隣接しかつ摺動面被
覆層としての下方の帯状区分３が最上段のピスト
ンリング溝７の上縁６に隣接している特許請求の
範囲第１項記載の軽金属ピストン。 ３ 摺動面被覆層の帯状区分３がピストンの全周
にわたつて一様な幅を有している特許請求の範囲
第１項又は第２項記載の軽金属ピストン。 ４ 摺動面被覆層の各帯状区分３が互いに異なる
幅を有している特許請求の範囲第１項から第３項
のいずれか１項記載の軽金属ピストン。 ５ 摺動面被覆層の各帯状区分３の幅がピストン
ヘツド端面５からトツプランド２の下端部に向か
つて増大している特許請求の範囲第４項記載の軽
金属ピストン。 ６ 摺動面被覆層の帯状区分３がピストンの全周
にわたつて一様でない幅を有している特許請求の
範囲第１項又は第２項記載の軽金属ピストン。 ７ 少なくともトツプランド２の下端部に近い帯
状区分３の摺動面被覆層が１回若しくは複数回中
断されている特許請求の範囲第１項から第６項の
いずれか１項記載の軽金属ピストン。 ８ 摺動面被覆層が65％のCr3C2、残りはニツケ
ル及びクロムから成る材料をデトネーシヨン法で
付着することによつて形成されている特許請求の
範囲第１項から第７項のいずれか１項記載の軽金
属ピストン。[Scope of Claims] 1. In a light metal piston for an internal combustion engine having a thin sliding surface coating layer made of a heat-resistant material with little wear, the sliding surface coating layer has a unique property. The toppland 2 is provided with annular strips 3 which are also interrupted in the axial direction of the piston and are spaced apart from each other by partially exposing the circumferential surface of the toppland. A light metal piston for internal combustion engines, characterized by: 2. The upper strip section 3 as a sliding surface coating layer directly adjoins the piston head end face 5 and the lower strip section 3 as a sliding surface coating layer adjoins the upper edge 6 of the uppermost piston ring groove 7. A light metal piston according to claim 1. 3. The light metal piston according to claim 1 or 2, wherein the strip section 3 of the sliding surface coating layer has a uniform width over the entire circumference of the piston. 4. The light metal piston according to any one of claims 1 to 3, wherein each band-shaped section 3 of the sliding surface coating layer has a mutually different width. 5. A light metal piston according to claim 4, wherein the width of each strip section 3 of the sliding surface coating layer increases from the piston head end surface 5 toward the lower end of the top land 2. 6. The light metal piston according to claim 1 or 2, wherein the band-shaped section 3 of the sliding surface coating layer has a width that is not uniform over the entire circumference of the piston. 7. The light metal piston according to any one of claims 1 to 6, wherein the sliding surface coating layer of the strip section 3 near the lower end of the toppland 2 is interrupted once or multiple times. 8. Any one of claims 1 to 7, wherein the sliding surface coating layer is formed by depositing a material consisting of 65% Cr 3 C 2 and the rest nickel and chromium by a detonation method. The light metal piston according to item 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833304320 DE3304320C1 (en) | 1983-02-09 | 1983-02-09 | Light alloy piston for internal combustion engines, especially those operated using heavy oil |
| DE3304320.5 | 1983-02-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59147848A JPS59147848A (en) | 1984-08-24 |
| JPH0451661B2 true JPH0451661B2 (en) | 1992-08-19 |
Family
ID=6190340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1852084A Granted JPS59147848A (en) | 1983-02-09 | 1984-02-06 | Light metal piston for internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS59147848A (en) |
| DE (1) | DE3304320C1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4113773C2 (en) * | 1990-07-23 | 1994-11-03 | Alcan Gmbh | Pistons for internal combustion engines |
| JP5998696B2 (en) * | 2012-07-19 | 2016-09-28 | マツダ株式会社 | Engine combustion chamber insulation structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5324568U (en) * | 1976-08-10 | 1978-03-02 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1509586U (en) * | ||||
| DE1504033U (en) * | ||||
| DE2046862A1 (en) * | 1970-09-23 | 1972-03-30 | Dr.Ing.H.C. F. Porsche Kg, 7000 Stuttgart | Surface coating for a piston of internal combustion engines made of a magnesium alloy |
| DE2550907C3 (en) * | 1975-11-13 | 1981-08-13 | Mahle Gmbh, 7000 Stuttgart | Metal-sprayed base reinforcement of an aluminum plunger for internal combustion engines |
| GB2063305B (en) * | 1979-10-15 | 1984-02-01 | United Technologies Corp | Carbon bearing mcraiy coatings coated articles and method for these coatings |
| DE3201498A1 (en) * | 1982-01-20 | 1983-07-28 | Karl Schmidt Gmbh, 7107 Neckarsulm | LIGHT METAL PISTON |
-
1983
- 1983-02-09 DE DE19833304320 patent/DE3304320C1/en not_active Expired
-
1984
- 1984-02-06 JP JP1852084A patent/JPS59147848A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5324568U (en) * | 1976-08-10 | 1978-03-02 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59147848A (en) | 1984-08-24 |
| DE3304320C1 (en) | 1988-07-07 |
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