• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PISTON RING. The present invention relates to a piston ring which is provided with a carbon-based coating which has a property of low friction and wear resistance, i.e. a piston ring which has a formed carbon-based coating. on its sliding surface, on which piston ring, the coating is a multilayer coating comprising of two types of layers having different hardness laminated in at least two layers, a hardness difference between the two types of layers is 500 at 1700 HV, a high hardness layer has the same or greater thickness as a low hardness layer, and the coating as a whole has a thickness of 5.0 109>m or more. The high hardness layer has a thickness of 5 to 90 nm. The surface on which the coating is formed has a base material roughness of 1.0 109>mRz or less.
    公开号:BR102012006917B1
    申请号:R102012006917-2
    申请日:2012-03-28
    公开日:2021-04-20
    发明作者:Takatsugu Iwashita；Tomoyuki Sato
    申请人:Tpr Co., Ltd；
    IPC主号:
    专利说明:

    BACKGROUND OF THE INVENTION FIELD OF THE INVENTION
    [001] The present invention relates to a piston ring for an internal combustion engine. DESCRIPTION OF RELATED TECHNIQUE
    [002] A carbon-based coating is known as a coating which has a low coefficient of friction, but the coating stress is high and self-fracture occurs, so increasing the thickness is difficult. Japanese Patent Publication (A) Number 2006-008853 proposes a carbon-based coating with a low coefficient of friction which is made of a multi-layer structure with one more layer on the surface comprised of a soft layer and with soft and soft layers. hard layers alternately laminated and which allows a smooth surface to be easily obtained.
    [003] See Japanese Patent Publication (A) 2006 Number 008853 above for related art.
    [004] Japanese Patent Publication (A) Number 2006-008853 does not define the difference in hardness between the hard layer and the soft layer. However, in Japanese Patent Publication (A) Number 2006-008853, the soft layer is considered as a laying layer, while the hard layer is considered as a wear resistance layer, so the hardnesses are, in the Example 1, soft layer: 18 GPa and hard layer: 42 GPa, and in Example 2, soft layer: 20 GPa and hard layer: 41 GPa. The hardness difference between the soft layer and the hard layer was large. SUMMARY OF THE INVENTION
    [005] An object of the present invention is to provide a piston ring which is provided with a carbon-based coating which has a property of low friction and excellent wear resistance.
    [006] The present invention provides a piston ring that has a carbon-based coating formed on its sliding surface, in which piston ring, the coating is a multilayer coating comprised of two types of layers having different hardness laminated. in at least two layers each, a hardness difference between the two types of layers is 500 to 1700 HV, a high hardness layer has the same or greater thickness as a low hardness layer, and the coating as a whole has a thickness of 5.0 µm or more.
    [007] Preferably, the high hardness layer has a thickness of 5 to 90 nm.
    [008] Preferably, the surface on which the coating is formed has a base material roughness of 1.0 µmRz or less.
    [009] Preferably, a further layer on the coating surface is a layer of high hardness.
    [0010] Preferably, a low hardness layer of the coating contains only carbon or carbon and also Cr or Ti.
    [0011] Summarizing the advantageous effects of the invention, according to the piston ring of the present invention, making the carbon-based coating a multilayer coating of two types of layers, which have a hardness difference of 500 to 1700 HV , thickness increase becomes possible and both a low friction property and an excellent wear resistance are given. If the hardness difference is less than 500 HV, the coating cracks cause the sliding surface to become rough, the friction coefficient becomes greater, and the wear of the opposing material becomes greater as well. If the hardness difference becomes greater than 1700 HV, sliding causes the low hardness layer to become worn out, the stress is concentrated on the surface relief parts of the high hardness layer (see figure 1B), the coating chips, the coefficient of friction becomes greater, and the wear on the opposing material also becomes greater. If the total thickness of the coating is less than 5.0 µm, the wear resistance becomes insufficient. BRIEF DESCRIPTION OF THE DRAWINGS
    [0012] These and other objects and features of the present invention will become clearer from the following description of the preferred embodiments given with reference to the accompanying drawings, in which
    [0013] Figures 1A to 1C show an embodiment of the present invention, in which
    [0014] Figure 1A is a longitudinal cross-sectional view which shows a part of a piston ring,
    [0015] Figure 1B is an enlarged cross-sectional view of a coating part, and
    [0016] Figure 1C is a view which shows a part of a coating surface after sliding, and
    [0017] Figure 2 is a schematic view of an alternative wear tester. DESCRIPTION OF PREFERRED MODALITIES
    [0018] Below, a preferred embodiment of the present invention will be explained while referring to the drawings.
    [0019] A piston ring 1 has a carbon-based coating 2 formed on its outer circumference. Carbon-based coating 2 is a DLC (carbon like diamond) coating comprised of a multi-layer coating of two types of layers A and B with different hardness laminated in at least two layers each. In figures 1A to 1C, the two types of layers A and B are laminated in six layers each. The most surface layer is an A layer with a high hardness. The hardness difference between the two types of layers A and B is from 500 to 1700 HV. The layer A with the high hardness (hereinafter referred to as the "high hardness layer A") has a thickness of 5 to 90 nm, while the layer B with a low hardness (hereinafter referred to as the "low layer hardness B") has the same or greater thickness. The total thickness of the carbon 2 based coating is 5.0 µm or more. The base material roughness of the outer circumference is 1.0 μmRz or less. Low hardness layer B can contain Cr or Ti. If Cr or Ti are contained, adhesion with high hardness layer A is further improved.
    [0020] If the thickness of the high hardness layer A is less than 5 nm, the required widths of the high hardness layer A and the low hardness layer B which are exposed on the outer circumference after slipping (see figure 1C) cannot be sufficiently ensured, the oil-holding property drops, and the low-friction effect becomes insufficient. If the thickness becomes greater than 90 nm, the widths of the high hardness layer A and the low hardness layer B which are exposed to the outer circumference after slipping become too large, coating cracks occur, the coefficient of friction becomes greater, and the wear of the opposing material also becomes greater. If the roughness of the base material of the outer circumference is greater than 1.0 μmRz, the slip causes the low hardness layer B to wear, the stress concentrated on surface relief parts of the high hardness layer A ( see figure 1B), the coating flakes, the coefficient of friction becomes greater, and the wear of the opposite material also becomes greater. If the most surface layer is a layer of high hardness A, the opposing material surface can be quickly smoothed out.
    [0021] The carbon-based coating 2 above is formed using the PVD method by alternating crackling (forming the low hardness layer B) and ion coating (forming the high hardness layer A). Layer thicknesses are adjusted by changing formation times, while hardnesses are adjusted by changing the bias voltage.
    [0022] Below, the results of using an alternative wear tester to measure the amount of self-wear, the amount of opposing wear, and the coefficient of friction will be explained.
    [0023] Figure 2 shows the sketch of an alternative wear tester which is used for testing. A pin-shaped upper test piece 10 is secured by a retaining block 11. Above, a hydraulic cylinder 12 is used to apply a downward load whereby a lower test piece 13 is pressed against. On the other hand, a flat disc-shaped lower test piece 13 is held by a movable block 14 and is made to move back and forth by a crank mechanism 15. Reference numeral 16 indicates a load cell .
    [0024] The test conditions were as follows:
    [0025] Load: 100 N
    [0026] Speed: 600 cpm/min
    [0027] Lubricating oil: 5W-20
    [0028] Time: 1 hour
    [0029] Top test piece: pin-shaped test piece for piston ring given a DLC coating
    [0030] Bottom test piece: flaked graphite cast iron material for cylinder liner Table 1

    [0031] Although the invention has been described with reference to specific embodiments chosen for purposes of illustration, it should be apparent that numerous modifications could be made thereto by those skilled in the art without departing from the basic concept and scope of the invention.
    权利要求:
    Claims (2)
    [0001]
    1. Piston ring (1) for sliding through an engine lubricating oil against a flake-shaped graphite iron material for a cylinder liner of a cylinder (12) of an internal combustion engine, characterized by fact that the piston ring (1) has a carbon (2) diamond-like (DLC) coating formed on its sliding surface, on which piston ring (1), said coating is a multilayer coating comprised of two types of layers (A, B) which have different hardnesses alternatively laminated in at least two layers (A, B), a hardness difference between said two types of layers (A, B) is 500 to 1700 HV, one layer high hardness has the same or greater thickness as a low hardness layer, one more layer on the surface of the coating is the high hardness layer, and the coating as a whole has a thickness of 5.0 μm or more, where said high hardness layer has a thickness of 5nm or more and 90nm or less , and wherein the surface on which said coating is formed has a base material roughness of 1.0 µm Rz or less.
    [0002]
    2. Piston ring (1), according to claim 1, characterized in that a layer of low hardness of said coating contains only carbon (2) or carbon (2) and also Cr or Ti.
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    同族专利:
    公开号 | 公开日
    US9175771B2|2015-11-03|
    EP2505685A1|2012-10-03|
    EP2505685B1|2015-05-06|
    US20120248711A1|2012-10-04|
    CN102705102A|2012-10-03|
    CN102705102B|2016-03-23|
    IN2012DE00922A|2015-09-04|
    US20150137457A1|2015-05-21|
    KR20120110041A|2012-10-09|
    BR102012006917A2|2013-06-04|
    JP2012202522A|2012-10-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP2000120870A|1998-10-15|2000-04-28|Teikoku Piston Ring Co Ltd|Piston ring|
    JP2000170594A|1998-12-08|2000-06-20|Teikoku Piston Ring Co Ltd|Combination of cylinder liner and piston ring|
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    JP2006008853A|2004-06-25|2006-01-12|Nissan Motor Co Ltd|Hard carbon film sliding member and method for producing the same|
    US7947372B2|2005-08-18|2011-05-24|Sulzer Metaplas Gmbh|Substrate coated with a layered structure comprising a tetrahedral carbon layer and a softer outer layer|
    JP2007070667A|2005-09-05|2007-03-22|Kobe Steel Ltd|Formed article with hard multilayer film of diamond-like carbon, and production method therefor|
    JP4839120B2|2006-04-03|2011-12-21|株式会社リケン|Piston ring with laminated coating|
    US8597797B2|2006-11-14|2013-12-03|Kabushiki Kaisha Riken|Chromium nitride ion-plating coating and its production method, as well as piston ring used for internal combustion engine|
    JP2008286354A|2007-05-21|2008-11-27|Nippon Piston Ring Co Ltd|Sliding member|
    JP5828575B2|2008-03-04|2015-12-09|日産自動車株式会社|piston ring|
    US20110186420A1|2008-06-09|2011-08-04|Nanofilm Technologies International Pte Ltd|Method for rapid deposition of a coating on a substrate|
    DE102009028504C5|2009-08-13|2014-10-30|Federal-Mogul Burscheid Gmbh|Piston ring with a coating|
    DE102009046281B3|2009-11-02|2010-11-25|Federal-Mogul Burscheid Gmbh|Sliding element, in particular piston ring, and combination of a sliding element with a running partner|CN102741535B|2010-01-29|2014-09-10|日本活塞环株式会社|Piston ring|
    DE102012020757A1|2012-10-23|2014-05-08|Mahle International Gmbh|Component with a coating and process for its preparation|
    DE102013200846A1|2013-01-21|2014-07-24|Federal-Mogul Burscheid Gmbh|Sliding element, in particular piston ring, with a coating|
    CN104903631B|2013-02-28|2017-10-10|日本活塞环株式会社|Hard carbon coating|
    DE102014200607A1|2014-01-15|2015-07-16|Federal-Mogul Burscheid Gmbh|Sliding element, in particular piston ring|
    CN105765274B|2014-01-31|2018-04-10|日本活塞环株式会社|Piston ring and its manufacture method|
    US10329509B2|2015-01-29|2019-06-25|Jtekt Corporation|Amorphous hydrocarbon based film, and sliding member and sliding system with said film|
    US9551419B2|2015-04-22|2017-01-24|Federal-Mogul Corporation|Coated sliding element|
    JP6557342B2|2015-07-31|2019-08-07|日本ピストンリング株式会社|Piston ring and manufacturing method thereof|
    US10619739B2|2015-07-31|2020-04-14|Nippon Piston Ring Co., Ltd|Piston ring|
    CN107923532B|2015-08-10|2020-06-23|日本Itf株式会社|Piston ring and engine|
    CN110397735B|2015-08-10|2020-12-22|日本Itf株式会社|Piston ring|
    JP6343266B2|2015-09-09|2018-06-13|株式会社リケン|Sliding member and piston ring|
    EP3392369A4|2015-12-18|2020-01-22|Nippon ITF, Inc.|Coating film, manufacturing method therefor, and pvd apparatus|
    BR102015032127B1|2015-12-21|2021-09-08|Mahle Metal Leve S.A.|SLIDING ELEMENT|
    BR102016015392A2|2016-06-30|2018-01-16|Mahle Metal Leve S.A.|SLIDING ELEMENT FOR INTERNAL COMBUSTION ENGINES|
    US11242929B2|2018-06-29|2022-02-08|Tpr Co., Ltd.|Piston ring|
    CN109355619A|2018-09-25|2019-02-19|安庆帝伯格茨活塞环有限公司|A kind of piston ring and preparation method with soft and hard alternation diamond-like coating|
    法律状态:
    2013-06-04| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-07-09| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2020-04-22| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2020-11-03| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2021-03-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-04-20| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011-069676|2011-03-28|
    JP2011069676A|JP2012202522A|2011-03-28|2011-03-28|Piston ring|
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