JPH0544838A - Piston crown of reciprocating engine - Google Patents
Piston crown of reciprocating engineInfo
- Publication number
- JPH0544838A JPH0544838A JP22096391A JP22096391A JPH0544838A JP H0544838 A JPH0544838 A JP H0544838A JP 22096391 A JP22096391 A JP 22096391A JP 22096391 A JP22096391 A JP 22096391A JP H0544838 A JPH0544838 A JP H0544838A
- Authority
- JP
- Japan
- Prior art keywords
- ring groove
- wear
- piston crown
- reciprocating engine
- resistant material
- 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.)
- Withdrawn
Links
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は往復動機関のピストン冠
に関する。FIELD OF THE INVENTION The present invention relates to a piston crown of a reciprocating engine.
【０００２】[0002]
【従来の技術】ディーゼルエンジン等では、そのピスト
ン冠のリング溝は図７縦断面図示すように、ピストン冠
素材１′を機械加工したままの状態か、又はリング溝の
上段２ａ′及び下段２ｂ′に耐摩耗性を付加するため硬
質クロームメッキが施された状態である。ところが、硬
質クロームメッキは、コストや剥離強度の面からメッキ
厚さは、たかだか０．３〜０．５ｍｍであり、したがっ
て、長時間例えば１０，０００時間以上運転すると、リ
ング溝の下段部は、図８に示すようにピストン冠の外周
側に大きくテーパー状に摩耗し、その厚さ２ｂ″はクロ
ームメッキの厚さを越えて、ピストン冠素材が露出する
に到る。すなわち、舶用ディーゼルなどで５年間の寿命
を確保することは、もはや、クロームメッキでは不可能
となっているので、５年間無解放リング溝の耐久性を実
現するためには、クロームメッキと同等以上の耐摩耗性
を有する材料を数倍の厚さに装着する技術の確立が必要
である。2. Description of the Related Art In a diesel engine or the like, the ring groove of the piston crown is in a state in which the piston crown material 1'is still machined, as shown in the vertical sectional view of FIG. 7, or the upper groove 2a 'and the lower groove 2b of the ring groove. Hard chrome plating has been applied to add wear resistance to the ‘ However, the hard chrome plating has a plating thickness of at most 0.3 to 0.5 mm from the viewpoint of cost and peel strength, and therefore, when the hard chrome plating is operated for a long time, for example, 10,000 hours or more, the lower part of the ring groove is As shown in FIG. 8, the piston crown is worn on the outer peripheral side in a large taper shape, the thickness 2b ″ exceeds the thickness of the chrome plating, and the piston crown material is exposed. Since it is no longer possible to secure a life of 5 years with chrome plating, in order to realize the durability of the non-release ring groove for 5 years, it has wear resistance equal to or higher than that of chrome plating. It is necessary to establish a technology for mounting the material several times thicker.
【０００３】[0003]
【発明が解決しようとする課題】従来、ピストン冠のリ
ング溝形状は、エンジンの大きさによって異なり、シリ
ンダー径３５０ｍｍ以上の２サイクル機関では溝の高さ
は（７〜８ｍｍ）〜（１７〜１８ｍｍ），溝幅は（１８
〜１９ｍｍ）〜（２３〜２４ｍｍ）程度である。リング
溝の下段（図７の２ｂ′）にメッキ技術以外で、耐摩耗
材を装着する手段としては溶射又は肉盛溶接などが考え
られるのであるが、通常の溝形状では上記のように溝幅
に対して溝高さが低いため上記の溶射及び肉盛溶接は困
難とされている。Conventionally, the shape of the ring groove of the piston crown varies depending on the size of the engine. In a two-cycle engine having a cylinder diameter of 350 mm or more, the groove height is (7 to 8 mm) to (17 to 18 mm). ), The groove width is (18
.About.19 mm) to (23 to 24 mm). Other than plating technology, it is conceivable that the wear resistance material is attached to the lower part of the ring groove (2b 'in Fig. 7) by thermal spraying or overlay welding. On the other hand, since the groove height is low, the above thermal spraying and overlay welding are difficult.
【０００４】本発明はこのような事情に鑑みて提案され
たもので、ピストンリング溝の耐摩耗性の大きい往復動
機関のピストン冠を提供することを目的とする。The present invention has been proposed in view of such circumstances, and an object thereof is to provide a piston crown of a reciprocating engine in which the piston ring groove has a large wear resistance.
【０００５】[0005]
【課題を解決するための手段】そのために、本発明は、
往復動機関のピストン冠において、ピストンリングが装
着されるリング溝の下面の外周から約１／２の幅で全周
にわたって厚さ０．５〜２ｍｍの耐磨耗材を装着し、か
つ、該リング溝の下面に相対する上面の角部の予め切落
とされた部分を溶着金属で修復してなることを特徴とす
る。To this end, the present invention provides
In a piston crown of a reciprocating engine, a wear-resistant material having a width of about 1/2 and a thickness of 0.5 to 2 mm is mounted from the outer circumference of the lower surface of a ring groove in which the piston ring is mounted, and the ring. It is characterized in that a previously cut off portion of a corner portion of the upper surface facing the lower surface of the groove is repaired with a weld metal.
【０００６】[0006]
【作用】このような構成によれば、まず、耐摩耗材の装
着範囲をリング溝幅の約１／２以下にすることによっ
て、高価な耐摩耗材の有効利用が可能となる。また、上
記の耐摩耗材装着範囲の適正化とリング溝上段の角部を
一部切落とすことによって、従来困難とされていた耐摩
耗材の溶射や肉盛溶接が可能となり、施工の迅速化（能
率向上）のみならず耐摩耗材の厚肉化とクロームメッキ
よりも耐久性のある耐摩耗材（例えばＣｒ3 Ｃ2 ，Ｗ
Ｃ，ＷＣ＋Ｃｒ＋Ｆｅなど）の使用が可能になる。これ
らの技術的手段の相乗効果によって、耐久性に優れたリ
ング溝を有するピストン冠の製造が可能となる。According to such a construction, first, by setting the mounting range of the wear resistant material to about 1/2 or less of the ring groove width, it is possible to effectively use the expensive wear resistant material. Also, by optimizing the wear-resistant material mounting range and cutting off some of the upper corners of the ring groove, it has become possible to perform spraying and overlay welding of wear-resistant materials, which has been considered difficult in the past. Not only improved but also thicker wear resistant material and wear resistant material more durable than chrome plating (eg Cr 3 C 2 , W
C, WC + Cr + Fe, etc.) can be used. The synergistic effect of these technical measures makes it possible to manufacture a piston crown having a ring groove with excellent durability.
【０００７】[0007]
【実施例】本発明の一実施例を図面について説明する
と、図１はその部分縦断側面図、図２は図１の部分拡大
図、図３は図２のリング溝下段への耐摩耗材の溶射要領
を示す説明図、図４は図２のリング溝下段への耐摩耗材
の肉盛り溶接要領を示す説明図、図５は図３の耐摩耗材
の溶射後の切欠部の修復状況を示す縦断面図、図６は図
４の耐摩耗材の肉盛り溶接後の切欠部の修復状況を示す
縦断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial longitudinal side view thereof, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. FIG. 4 is an explanatory view showing the procedure, FIG. 4 is an explanatory view showing the procedure of build-up welding of the wear resistant material to the lower stage of the ring groove of FIG. 2, and FIG. 6 and 6 are vertical cross-sectional views showing a repaired state of the notch after the overlay welding of the wear resistant material of FIG.
【０００８】図１に示す往復動機関のピストン冠本体１
において、その外周にリング溝２が４ヶ所（３ヶ所の場
合もある）加工してあり、このリング溝を図２に示すよ
うに、リング溝の下段を、溝幅Ｌの約１／2 つまりｌ＝
Ｌ／２だけ外周側を０．５〜２ｍｍ厚さ切込み２ａ、さ
らにリング溝の上段の外周角部を切り落とし部２ｂとし
て斜めに切落とす。ここで、リング溝下段の切込み部分
２ａは、耐摩耗材を装着する厚みと範囲を決めるもの
で、リング溝上段の角部の切落とし部分２ｂは、後記す
るように、耐摩耗材の装着範囲を溝幅の約１／2 程度確
保するためである。したがって、耐摩耗材の装着範囲を
リング溝下段の外周側数ｍｍにする場合は上記の角部切
落とし部分２ｂの加工は不要となる。しかし、より耐久
性をもたせるためにはリング溝幅の約１／２程度の装着
幅は必要である。A piston crown body 1 of a reciprocating engine shown in FIG.
4, the ring groove 2 is machined on its outer periphery at four locations (sometimes three locations), and as shown in FIG. 2, the lower portion of the ring groove is about 1/2 of the groove width L. l =
The outer peripheral side is cut by 0.5 mm to 2 mm in thickness by L / 2, and the outer peripheral corner portion of the upper stage of the ring groove is cut off obliquely as a cutoff portion 2b. Here, the cut portion 2a in the lower stage of the ring groove determines the thickness and range in which the wear-resistant material is mounted, and the cut-off portion 2b in the upper portion of the ring groove defines the mounting range of the wear-resistant material as described later. This is to secure about 1/2 of the width. Therefore, when the wear-resistant material is mounted on the outer peripheral side of the lower stage of the ring groove by several mm, it is not necessary to process the corner cut-off portion 2b. However, the mounting width of about 1/2 of the ring groove width is required for more durability.
【０００９】このような断面形状を有するリング溝に、
図３に示すように、耐摩耗材３ａを溶射ガン４によって
の切込み部２ａに装着する。その際、切落とし部２ｂが
耐摩耗粒子の噴射を妨げないようになっている状況が理
解できる。ところで、溶射ガン４を図面左側へ傾斜させ
れば切落とし部２ｂはなくても図示する装着範囲は確保
できることになるが、溶射角度がさらに小さくなり、密
着強度が低下し、耐摩耗材が剥離しやすくなるので、経
験的には溶射角度は４５°〜９０°が実際的である。In the ring groove having such a sectional shape,
As shown in FIG. 3, the wear resistant material 3a is attached to the cut portion 2a formed by the thermal spray gun 4. At that time, it can be understood that the cut-off portion 2b does not hinder the injection of wear-resistant particles. By the way, if the spray gun 4 is tilted to the left side in the drawing, the mounting range shown can be secured without the cut-off portion 2b, but the spray angle is further reduced, the adhesion strength is reduced, and the wear-resistant material is peeled off. Since it becomes easy, the empirically, the spray angle is practically 45 ° to 90 °.
【００１０】なお、溶射の代わりに、図４に示すよう
に、耐摩耗材を肉盛溶接によって装着することもでき
る。これによると溶接トーチ４をもって耐摩耗肉盛り部
を形成することができる。図５はリング溝の下段に耐摩
耗材が装着されたのち、ピストン冠本体１を反転して、
あらかじめ切落とした角部を修復する要領を示し、この
盛金部分３ｂは原則的にはピストン冠本体１と同一材質
で良いと思われるが、リングなどの振動により摩耗が生
ずるようであれば、高硬度の溶着金属で構成することも
可能である。図６は本発明の最終加工が完了した状況を
示すもので、リング溝は耐摩耗材３ａと修復部分３ｂに
よって構成される。これによって従来のクロームメッキ
によるリング溝よりも耐摩耗性にすぐれ、かつ耐久性を
大幅（数倍）に向上するリング溝を有するピストン冠が
得られる。Instead of thermal spraying, as shown in FIG. 4, an abrasion resistant material can be attached by overlay welding. According to this, the welding torch 4 can form the wear-resistant build-up portion. In FIG. 5, after the wear resistant material is attached to the lower stage of the ring groove, the piston crown body 1 is inverted and
The procedure for repairing the corners that have been cut off in advance is shown. It is considered that the heap portion 3b is made of the same material as the piston crown body 1 in principle, but if wear is caused by vibration of the ring or the like, It is also possible to use a weld metal having a high hardness. FIG. 6 shows a situation in which the final processing of the present invention is completed, and the ring groove is composed of the wear resistant material 3a and the repaired portion 3b. As a result, a piston crown having a ring groove that is superior in wear resistance to the conventional chrome-plated ring groove and that greatly improves durability (several times) can be obtained.
【００１１】[0011]
【発明の効果】内燃機関搭載船舶の運航後のピストン冠
リング溝の摩耗状況の調査結果から、耐摩耗材を装着す
る最小必要範囲が想定されたことによって、従来のクロ
ームメッキに代わる本発明加工を施したリング溝を有す
るピストン冠を試験したところ、予想通りの好結果が得
られた。本発明はリング溝の上段の外周角部を切欠くこ
と、及び耐摩耗材の装着範囲を溝幅の約２／１以下にす
ることによって、従来、施工不可とされていた溶射法及
び肉盛溶接法の採用を可能し、これによってクロームメ
ッキ以外の耐摩耗材例えばＣｒ3 Ｃ2 ，ＷＣ，ＷＣ＋Ｃ
ｒ＋Ｆｅなどの装着を可能にすると共に装着の厚肉化を
可能にした。これによって、リング溝の耐久性が耐摩耗
材の変更と厚肉化により従来の数倍になることが判明し
た。According to the result of the investigation of the wear condition of the piston crown ring groove after the operation of the ship equipped with the internal combustion engine, the minimum necessary range for mounting the wear resistant material is assumed, so that the present invention machining instead of the conventional chrome plating is performed. Testing of the piston crown with the applied ring groove gave the expected good results. The present invention cuts out the outer peripheral corners of the upper stage of the ring groove and sets the wear-resistant material mounting range to about 2/1 or less of the groove width, thereby making it impossible to perform conventional thermal spraying and overlay welding. It is possible to adopt the method, and thereby wear resistant materials other than chrome plating such as Cr 3 C 2 , WC, WC + C
It is possible to install r + Fe and thicken the installation. As a result, it was found that the durability of the ring groove was several times that of the conventional one due to the change of the wear resistant material and the increase in thickness.
【００１２】要するに本発明によれば、往復動機関のピ
ストン冠において、ピストンリングが装着されるリング
溝の下面の外周から約１／２の幅で全周にわたって厚さ
０．５〜２ｍｍの耐摩耗材を装着し、かつ、該リング溝
の下面に相対する上面の角部の予め切落とされた部分を
溶着金属で修復してなることにより、ピストンリング溝
の耐摩耗性の大きい往復動機関のピストン冠を得るか
ら、本発明は産業上極めて有益なものである。In short, according to the present invention, in a piston crown of a reciprocating engine, a wear resistance of 0.5 to 2 mm is formed with a width of about 1/2 from the outer circumference of the lower surface of the ring groove in which the piston ring is mounted. By attaching a wear material and by repairing the previously cut off portion of the corner portion of the upper surface facing the lower surface of the ring groove with a weld metal, the reciprocating engine of the reciprocating engine having a large wear resistance of the piston ring groove is formed. Since the piston crown is obtained, the present invention is extremely useful in industry.
【図１】本発明の一実施例を示す部分縦断側面図であ
る。FIG. 1 is a partial vertical sectional side view showing an embodiment of the present invention.
【図２】図１の部分拡大図である。FIG. 2 is a partially enlarged view of FIG.
【図３】図２のリング溝下段への耐摩耗材の溶射要領を
示す説明図である。FIG. 3 is an explanatory view showing a procedure for spraying a wear resistant material onto a lower stage of the ring groove of FIG.
【図４】図２のリング溝下段への耐摩耗材の肉盛り溶接
要領を示す説明図である。FIG. 4 is an explanatory view showing a procedure for build-up welding of a wear-resistant material to the lower stage of the ring groove of FIG.
【図５】図３の耐摩耗材の溶射後の切欠部の修復状況を
示す縦断面図である。FIG. 5 is a vertical cross-sectional view showing a repaired state of the cutout portion after the thermal spraying of the wear resistant material of FIG. 3;
【図６】図４の耐摩耗材の肉盛り溶接後の切欠部の修復
状況を示す縦断面図である。FIG. 6 is a vertical cross-sectional view showing how the cutout portion of the wear resistant material of FIG. 4 is repaired after build-up welding.
【図７】従来のピストン冠のリング溝を示す縦断面図で
ある。FIG. 7 is a vertical sectional view showing a ring groove of a conventional piston crown.
【図８】従来のピストン冠リング溝の摩耗状況を示す縦
断面図である。FIG. 8 is a vertical cross-sectional view showing a wear situation of a conventional piston crown ring groove.
１ ピストン冠本体 ２ リング溝 ２ａ 耐摩耗材を配する切込み部分 ２ｂ 溶射及び肉盛溶接施工を可能にするための切落と
し部分 ３ａ 耐摩耗材 ３ｂ 切落とし部の修復部分（溶着金属） ４ 溶射ガン1 Piston crown main body 2 Ring groove 2a Cut portion 2b for arranging wear-resistant material 2b Cut-off portion for enabling thermal spraying and overlay welding 3a Wear-resistant material 3b Repaired portion of cut-off portion (welded metal) 4 Spray gun
Claims (1)
トンリングが装着されるリング溝の下面の外周から約１
／２の幅で全周にわたって厚さ０．５〜２ｍｍの耐磨耗
材を装着し、かつ、該リング溝の下面に相対する上面の
角部の予め切落とされた部分を溶着金属で修復してなる
ことを特徴とする往復動機関のピストン冠。1. In a piston crown of a reciprocating engine, about 1 from the outer circumference of the lower surface of a ring groove in which a piston ring is mounted.
A wear-resistant material having a width of / 2 and a thickness of 0.5 to 2 mm is mounted over the entire circumference, and a precut off portion of a corner of the upper surface facing the lower surface of the ring groove is repaired with a weld metal. The piston crown of a reciprocating engine characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22096391A JPH0544838A (en) | 1991-08-06 | 1991-08-06 | Piston crown of reciprocating engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22096391A JPH0544838A (en) | 1991-08-06 | 1991-08-06 | Piston crown of reciprocating engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0544838A true JPH0544838A (en) | 1993-02-23 |
Family
ID=16759302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22096391A Withdrawn JPH0544838A (en) | 1991-08-06 | 1991-08-06 | Piston crown of reciprocating engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0544838A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0691417A2 (en) | 1994-06-06 | 1996-01-10 | Toyota Jidosha Kabushiki Kaisha | Method of spraying material, method of manufacturing sliding member having sliding surface which comprises sprayed layer; piston and method of manufacturing the same |
| WO2014168906A1 (en) * | 2013-04-08 | 2014-10-16 | Caterpillar Inc. | Repaired pistons and collection thereof |
-
1991
- 1991-08-06 JP JP22096391A patent/JPH0544838A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0691417A2 (en) | 1994-06-06 | 1996-01-10 | Toyota Jidosha Kabushiki Kaisha | Method of spraying material, method of manufacturing sliding member having sliding surface which comprises sprayed layer; piston and method of manufacturing the same |
| US5756150A (en) * | 1994-06-06 | 1998-05-26 | Toyota Jidosha Kabushiki Kaisha | Method of spraying particulate materials on a solid surface materials |
| EP0691417A3 (en) * | 1994-06-06 | 1998-06-03 | Toyota Jidosha Kabushiki Kaisha | Method of spraying material, method of manufacturing sliding member having sliding surface which comprises sprayed layer; piston and method of manufacturing the same |
| US6671943B1 (en) | 1994-06-06 | 2004-01-06 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing a piston |
| WO2014168906A1 (en) * | 2013-04-08 | 2014-10-16 | Caterpillar Inc. | Repaired pistons and collection thereof |
| CN105263669A (en) * | 2013-04-08 | 2016-01-20 | 卡特彼勒公司 | Repaired pistons and collection thereof |
| US9587740B2 (en) | 2013-04-08 | 2017-03-07 | Caterpillar Inc. | Repaired pistons and collection thereof |
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| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981112 |