WO2016029599A1 - 用于乙醇燃料发动机的活塞 - Google Patents

用于乙醇燃料发动机的活塞 Download PDF

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WO2016029599A1
WO2016029599A1 PCT/CN2014/093976 CN2014093976W WO2016029599A1 WO 2016029599 A1 WO2016029599 A1 WO 2016029599A1 CN 2014093976 W CN2014093976 W CN 2014093976W WO 2016029599 A1 WO2016029599 A1 WO 2016029599A1
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Prior art keywords
ring
piston
gas
oil
fuel engine
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PCT/CN2014/093976
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English (en)
French (fr)
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罗俊
张应兵
高伟
章家续
田国庆
邱若友
何月涛
王英杰
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安徽江淮汽车股份有限公司
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Publication of WO2016029599A1 publication Critical patent/WO2016029599A1/zh

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    • 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
    • F02F5/00—Piston rings, e.g. associated with piston crown
    • 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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction

Definitions

  • the utility model belongs to the field of engines, in particular to a piston for an ethanol fuel engine.
  • ethanol fuel is the focus of the world's renewable energy development. Adding the right amount of ethanol to gasoline as a fuel for automobiles can save oil resources, reduce air pollution from automobile exhaust, and promote agricultural production. However, due to the corrosive nature of the ethanol fuel, it will erode the piston ring on the piston in the engine, reducing the service life of the piston ring, thereby reducing the performance of the piston, thereby affecting the normal use of the engine.
  • the technical problem to be solved by the present invention is to provide a piston for an ethanol fuel engine, the purpose of which is to strengthen the corrosion resistance and wear resistance of the piston ring on the piston, thereby prolonging the service life of the piston.
  • a piston for an ethanol fuel engine is provided with a first gas ring, a second gas ring and an oil ring from top to bottom in a piston head, wherein the first gas ring is a rectangular barrel ring structure.
  • the ring surface is provided with a PVD (physical meteorological precipitation) layer, the tangential elastic force of the first air ring is 6.5N to 10.5N; the second gas ring is a tapered outer stepped twist ring structure, and the ring surface is arranged
  • the phosphating layer has a tangential elastic force of 8.5N to 12.5N;
  • the oil ring is a steel belt combined oil ring, and a chrome-plated phosphating layer is disposed on the surface thereof, and the tangential elastic force of the oil ring is 22N ⁇ 38N.
  • the tangential elastic force of the first air ring is 8.5N.
  • the tangential elastic force of the second air ring is 10.5N.
  • the oil ring has a tangential elastic force of 30N.
  • the closed gap of the first air ring is 0.25 mm to 0.35 mm, and the matching gap of the ring groove is 0.03 mm to 0.075 mm.
  • the closed gap of the first air ring is 0.30 mm, and the matching clearance of the ring groove is 0.05mm.
  • the second gas ring has a taper of 1° 30 ′ to 2° 30 ′.
  • the closed gap of the second air ring is 0.30 mm to 0.80 mm, and the matching gap of the ring groove is 0.02 mm to 0.06 mm.
  • the closed gap of the second air ring is 0.50 mm, and the matching gap of the ring groove is 0.04 mm.
  • the utility model relates to a piston for an ethanol fuel engine, wherein the first gas ring adopts a rectangular barrel surface ring structure, and the main advantage is that the ring and the cylinder wall are always in surface contact, thereby speeding up the running-in and improving the sealing performance, and adapting to the cylinder surface.
  • the property and the adaptability to the piston swing are better, and the PVD (physical meteorological precipitation) layer is provided on the surface of the first ring to improve the corrosion of the piston ring by the ethanol fuel and improve the wear resistance of the piston ring.
  • the second gas ring is a tapered outer stepped twist ring for phosphating the surface.
  • the main advantage is that the ring has an oil-laying effect when moving upwards, forming an oil film, improving lubrication, and the downward moving oil scraping effect is obvious, and the ring is in the Twisting in the ring groove reduces chattering in the ring groove and reduces pumping.
  • the scraping oil of the piston ring is mainly completed by the oil ring.
  • the steel belt combined oil ring can reduce the height of the scraping edge and the height of the ring body, improve the flexibility of the ring body and the fit of the ring and the cylinder, thereby improving the scraping of the oil ring.
  • Oil performance and side sealing so as to better prevent the oil from passing through the side sill, and the surface of the oil ring is treated with chrome-plated manganese phosphating to improve the wear resistance of the oil ring and avoid the dilution of the lubricating oil “water”.
  • the cylinder bore has an effect.
  • FIG. 1 is a cross-sectional view of a piston for an ethanol fuel engine provided by an embodiment of the present invention
  • FIG. 2 is a cross-sectional view of a first air ring in a piston for an ethanol fuel engine according to an embodiment of the present invention
  • FIG. 3 is a cross-sectional view of a second air ring in a piston for an ethanol fuel engine according to an embodiment of the present invention
  • FIG. 4 is a cross-sectional view of an oil ring in a piston for an ethanol fuel engine according to an embodiment of the present invention.
  • FIGS. 1 to 4 The reference numerals in FIGS. 1 to 4 are: 1 first air ring, 2 second air ring, and oil ring 3.
  • a piston for an ethanol fuel engine is provided with a piston ring on a piston head, and the piston ring is a first gas ring 1, a second gas ring 2 and an oil from top to bottom.
  • Ring 3 wherein the first gas ring 1 is a rectangular barrel ring structure of the alloy cast iron A661, and the ring surface is provided with a PVD (physical meteorological precipitation) layer, and the PVD layer is physically deposited in the first gas ring 1
  • the surface of the surface is formed with a coating having a thickness of about 3-10 ⁇ m, thereby increasing the service life of the piston ring.
  • the tangential elastic force of the first gas ring 1 is 6.5 N to 10.5 N, and is preferably 8.5 N in this embodiment.
  • the first gas ring 1 adopts a rectangular barrel ring structure, and the main advantage is that the ring and the cylinder wall are always in surface contact, thereby speeding up the running-in and improving the sealing performance, and adapting to the cylinder surface adaptability and the piston swing.
  • the surface of the first ring is provided with a PVD (physical meteorological precipitation) layer to improve the corrosion of the piston ring by the ethanol fuel and improve the wear resistance of the piston ring.
  • PVD physical meteorological precipitation
  • the second gas ring 2 is a tapered outer stepped ring structure of the alloy cast iron, preferably having a taper of 1° 30' to 2° 30'.
  • the ring surface of the second gas ring 2 is provided with a phosphating layer, and the tangential elastic force of the second gas ring 2 is 8.5 N to 12.5 N, preferably 10.5 N in this embodiment.
  • the second gas ring 2 is a tapered outer stepped twist ring for phosphating the surface.
  • the oil ring 3 is a steel belt combined oil ring, and the surface thereof is chrome-plated and then subjected to manganese phosphating treatment to form a chrome-plated phosphating layer.
  • the oil ring 3 has a tangential elastic force of 22N to 38N, and is preferably 30N in this embodiment.
  • the scraping oil of the piston ring is mainly completed by the oil ring 3.
  • the steel belt combined oil ring can reduce the height of the scraping edge and the height of the ring body, improve the flexibility of the ring body and the fit of the ring to the cylinder, thereby improving the oil ring.
  • Scrape performance and side sealing in order to better prevent the oil from passing through the side sill, and the surface of the oil ring is chrome-plated and manganese phosphating to improve the wear resistance of the oil ring and avoid the dilution of the oil by the ethanol combustion product “water”. It has an effect on the cylinder bore.
  • the tangential elastic force of the piston ring is one of the important quality characteristics of the piston ring.
  • the tangential elastic force will directly affect the performance of the engine and the service life of the piston ring. Therefore, the tangential elastic force of the first air ring 1 is designed as 6.5N ⁇ 10.5N, preferably 8.5N; tangential elastic design of the second gas ring 2 It is 8.5N to 12.5N, preferably 10.5N; the tangential elastic force of the oil ring 3 is designed to be 22N to 38N, preferably 30N.
  • the first gas ring 1 has a closed gap of 0.25 mm to 0.35 mm, and an optimum value of 0.30 mm.
  • the fitting clearance of the piston ring groove is 0.03 mm to 0.075 mm, and the optimum value is 0.05 mm.
  • the closed gap of the second gas ring 2 is 0.30 mm to 0.80 mm, and the optimum value is 0.50 mm.
  • the fitting clearance of the piston ring groove is 0.02 mm to 0.06 mm, and the optimum value is 0.04 mm.
  • the closed gap of the piston ring is to place the piston ring in the ring gauge whose diameter is the basic diameter of the cylinder, and the narrowest distance between the two ends of the opening. Because the internal combustion engine generates heat during operation, the piston ring will also expand, and the existence of the closed gap can effectively prevent the piston ring from being accidentally caused by the thermal expansion. A small closed gap is good for sealing the gas and reducing the oil consumption, but too small a closed gap will cause the piston ring to become stuck and lose its effectiveness, even breaking the piston ring and losing its function, resulting in pulling the cylinder. If the closed gap is too large, there is still a large gap at the opening of the piston ring during operation.
  • the closed gap of the first gas ring 1 is designed to be 0.25 mm to 0.35 mm, and the optimum value is 0.30 mm.
  • the fitting clearance of the piston ring groove is 0.03 mm to 0.075 mm, and the optimum value is 0.05 mm.
  • the closed gap of the second gas ring 2 is designed to be 0.30 mm to 0.80 mm, and the optimum value is 0.50 mm.
  • the fitting clearance of the piston ring groove is 0.02 mm to 0.06 mm, and the optimum value is 0.04 mm.
  • the content of the present invention is not limited to the above embodiments, and those skilled in the art can easily propose other embodiments according to the guiding spirit of the present invention, and these embodiments are all included in the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

一种用于乙醇燃料发动机的活塞，活塞头上自上而下依次设置有第一道气环（1）、第二道气环（2）和油环（3），第一道气环（1）为矩形桶面环结构，环表面设置有PVD层，切向弹力为6.5N～10.5N；第二道气环（2）为锥面外阶梯扭曲环结构，环表面设置有磷化层，切向弹力为8.5N～12.5N；油环（3）为钢带组合油环，环表面设置有镀铬磷化层，切向弹力为22N～38N。该活塞上的活塞环具有较强的耐腐蚀性和耐磨性，可延长活塞的使用寿命。

Description

用于乙醇燃料发动机的活塞 技术领域
本实用新型属于发动机领域，特别是一种用于乙醇燃料发动机的活塞。
背景技术
乙醇燃料作为一种新型清洁燃料，是当前世界上可再生能源的发展重点，在汽油中加入适量乙醇作为汽车燃料，可节省石油资源，减少汽车尾气对空气的污染，还可促进农业的生产。但是，由于乙醇燃料具有一定的腐蚀性，所以会侵蚀发动机中活塞上的活塞环，降低活塞环的使用寿命，从而降低活塞的使用性能，进而影响发动机的正常使用。
实用新型内容
本实用新型所要解决的技术问题是提供一种用于乙醇燃料发动机的活塞，其目的在于加强活塞上的活塞环的耐腐蚀性和耐磨性，从而延长活塞的使用寿命。
为了解决上述技术问题，本实用新型采用的技术方案是：
一种用于乙醇燃料发动机的活塞，其活塞头上自上而下依次设置有第一道气环、第二道气环和油环，所述第一道气环为矩形桶面环结构，其环表面设置有PVD(物理气象沉淀)层，该第一道气环的切向弹力为6.5N～10.5N；所述第二道气环为锥面外阶梯扭曲环结构，其环表面设置有磷化层，该第二道气环的切向弹力为8.5N～12.5N；所述油环为钢带组合油环，其表面设置有镀铬磷化层，该油环的切向弹力为22N～38N。
优选地，所述第一道气环的切向弹力为8.5N。
优选地，所述第二道气环的切向弹力为10.5N。
优选地，所述油环的切向弹力为30N。
优选地，所述第一道气环的闭口间隙为0.25mm～0.35mm，环槽的配合间隙为0.03mm～0.075mm。
优选地，所述第一道气环的闭口间隙为0.30mm，环槽的配合间隙为 0.05mm。
优选地，所述第二道气环的锥度为1°30＇～2°30＇。
优选地，所述第二道气环的闭口间隙为0.30mm～0.80mm，环槽的配合间隙为0.02mm～0.06mm。
优选地，所述第二道气环的闭口间隙为0.50mm，环槽的配合间隙为0.04mm。
本实用新型用于乙醇燃料发动机的活塞，其第一道气环采用矩形桶面环结构，主要优点是环与气缸壁始终为面接触，因而能加快磨合和提高密封性能，并且对气缸表面适应性和对活塞摆动的适应性较好，同时第一道环表面设有PVD(物理气象沉淀)层，改善了乙醇燃料对活塞环的腐蚀，提升活塞环的耐磨性。第二道气环为对表面进行磷化处理的锥面外阶梯扭曲环，主要优点是环在向上运动时有布油作用，形成油膜，改善润滑，向下运动刮油效果明显，并且环在环槽内扭曲，减少了在环槽内的颤振，从而减少泵油作用。活塞环的刮油主要是油环完成的，此种钢带组合油环可以减少刮油边高度和环体高度，提高环体的柔性以及环与气缸的贴合性，从而提高油环的刮油性能和侧面密封性，以便更好地防止机油通过侧面上窜，同时油环表面采用镀铬后锰磷化处理，提升油环的耐磨性，避免乙醇燃烧产物“水”将润滑油稀释对缸孔产生影响。
附图说明
图1为本实用新型实施例提供的用于乙醇燃料发动机的活塞的剖视图；
图2为本实用新型实施例提供的用于乙醇燃料发动机的活塞中第一道气环的剖面图；
图3为本实用新型实施例提供的用于乙醇燃料发动机的活塞中第二道气环的剖面图；
图4为本实用新型实施例提供的用于乙醇燃料发动机的活塞中油环的剖面图。
图1至图4中附图标记为：1第一道气环、2第二道气环、油环3。
具体实施方式
下面结合附图和具体实施方式对本实用新型作进一步详细说明：
如图1所示，一种用于乙醇燃料发动机的活塞，其活塞头上设置有活塞环，所述活塞环自上而下依次为第一道气环1、第二道气环2和油环3，其中，第一道气环1为合金铸铁A661的矩形桶面环结构，其环表面设置有PVD(物理气象沉淀)层，该PVD层通过物理沉积的方法在第一道气环1的表面形成一层厚度在3-10μm左右的镀膜，从而可提升活塞环的使用寿命。该第一道气环1的切向弹力为6.5N～10.5N，在本实施例中优选8.5N。第一道气环1采用矩形桶面环结构，主要优点是环与气缸壁始终为面接触，因而能加快磨合和提高密封性能，并且对气缸表面适应性和对活塞摆动的适应性较好，同时第一道环表面设有PVD(物理气象沉淀)层，改善乙醇燃料对活塞环的腐蚀，提升活塞环的耐磨性。
第二道气环2为合金铸铁的锥面外阶梯扭曲环结构，优选地，锥度为1°30＇～2°30＇。该第二道气环2的环表面设置有磷化层，该第二道气环2的切向弹力为8.5N～12.5N，本实施例中优选10.5N。第二道气环2为对表面进行磷化处理的锥面外阶梯扭曲环，主要优点是环在向上运动时有布油作用，形成油膜，改善润滑，向下运动刮油效果明显，并且环在环槽内扭曲，减少了在环槽内的颤振，从而减少泵油作用。
油环3为钢带组合油环，其表面采用镀铬后锰磷化处理后形成镀铬磷化层，该油环3的切向弹力为22N～38N，本实施例中优选30N。活塞环的刮油主要是油环3完成的，此种钢带组合油环可以减少刮油边高度和环体高度，提高环体的柔性以及环与气缸的贴合性，从而提高油环的刮油性能和侧面密封性，以便更好地防止机油通过侧面上窜，同时油环表面采用镀铬后锰磷化处理，提升油环的耐磨性，避免乙醇燃烧产物“水”将润滑油稀释对缸孔产生影响。
活塞环的切向弹力是活塞环的重要质量特性之一，切向弹力的大小将直接影响发动机的性能和活塞环的使用寿命，为此需将第一道气环1的切向弹力设计为6.5N～10.5N，优选8.5N；第二道气环2的切向弹力设计 为8.5N～12.5N，优选10.5N；油环3的切向弹力设计为22N～38N，优选30N。
一种实施例中，优选地，第一道气环1的闭口间隙为0.25mm～0.35mm，最佳值为0.30mm。活塞环槽的配合间隙为0.03mm～0.075mm，最佳值为0.05mm。第二道气环2的闭口间隙为0.30mm～0.80mm，最佳值为0.50mm。活塞环槽的配合间隙为0.02mm～0.06mm，最佳值为0.04mm。
所谓活塞环的闭口间隙是将活塞环放入直径为气缸基本直径的环规内，开口两端的最窄距离。因为内燃机运转时会产生热量，活塞环也会随之膨胀，闭口间隙的存在，能有效防止活塞环因热膨胀而产生抵口导致拉缸的事故发生。较小的闭口间隙有利于密封气体和降低机油消耗，但是闭口间隙过小会导致活塞环卡死失去功效，甚至折断而是活塞环丧失功能，导致拉缸。闭口间隙过大会使工作时活塞环的开口处仍有较大的间隙，这个较大的间隙会增大气体泄漏量通道并且是机油在此处上窜至燃烧室，从而导致窜气和烧机油事故。为此需将第一道气环1的闭口间隙设计为0.25mm～0.35mm，最佳值为0.30mm。活塞环槽的配合间隙为0.03mm～0.075mm，最佳值为0.05mm。第二道气环2的闭口间隙设计为0.30mm～0.80mm，最佳值为0.50mm。活塞环槽的配合间隙为0.02mm～0.06mm，最佳值为0.04mm。
综上所述，本实用新型的内容并不局限在上述实施例中，本领域的技术人员可以根据本实用新型的指导思想轻易提出其它实施方式，这些实施方式都包括在本实用新型的范围之内。

Claims (9)

  1. 一种用于乙醇燃料发动机的活塞，其活塞头上自上而下依次设置有第一道气环(1)、第二道气环(2)和油环(3)，其特征在于：
    所述第一道气环(1)为矩形桶面环结构，其环表面设置有PVD层，该第一道气环(1)的切向弹力为6.5N～10.5N；
    所述第二道气环(2)为锥面外阶梯扭曲环结构，其环表面设置有磷化层，该第二道气环(2)的切向弹力为8.5N～12.5N；
    所述油环(3)为钢带组合油环，其表面设置有镀铬磷化层，该油环(3)的切向弹力为22N～38N。
  2. 根据权利要求1所述的用于乙醇燃料发动机的活塞，其特征在于：所述第一道气环(1)的切向弹力为8.5N。
  3. 根据权利要求1所述的用于乙醇燃料发动机的活塞，其特征在于：所述第二道气环(2)的切向弹力为10.5N。
  4. 根据权利要求1所述的用于乙醇燃料发动机的活塞，其特征在于：所述油环(3)的切向弹力为30N。
  5. 根据权利要求1至4中任一项所述的用于乙醇燃料发动机的活塞，其特征在于：所述第一道气环(1)的闭口间隙为0.25mm～0.35mm，环槽的配合间隙为0.03mm～0.075mm。
  6. 根据权利要求5所述的用于乙醇燃料发动机的活塞，其特征在于：所述第一道气环(1)的闭口间隙为0.30mm，环槽的配合间隙为0.05mm。
  7. 根据权利要求1至4中任一项所述的用于乙醇燃料发动机的活塞，其特征在于：所述第二道气环(2)的锥度为1°30＇～2°30＇。
  8. 根据权利要求1至4中任一项所述的用于乙醇燃料发动机的活塞，其特征在于：所述第二道气环(2)的闭口间隙为0.30mm～0.80mm，环槽的配合间隙为0.02mm～0.06mm。
  9. 根据权利要求8所述的用于乙醇燃料发动机的活塞，其特征在于：所述第二道气环(2)的闭口间隙为0.50mm，环槽的配合间隙为0.04mm。
PCT/CN2014/093976 2014-08-25 2014-12-16 用于乙醇燃料发动机的活塞 WO2016029599A1 (zh)

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JPH02176269A (ja) * 1988-12-27 1990-07-09 Riken Corp ピストンリングの製造方法
CN201025154Y (zh) * 2007-04-09 2008-02-20 安徽江淮汽车股份有限公司 一种2.2升tci汽油发动机的活塞环
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