CN1128926C - Piston ring - Google Patents

Piston ring Download PDF

Info

Publication number
CN1128926C
CN1128926C CN98102968A CN98102968A CN1128926C CN 1128926 C CN1128926 C CN 1128926C CN 98102968 A CN98102968 A CN 98102968A CN 98102968 A CN98102968 A CN 98102968A CN 1128926 C CN1128926 C CN 1128926C
Authority
CN
China
Prior art keywords
piston ring
tunicle
chromium
nitride layer
nitride
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 - Fee Related
Application number
CN98102968A
Other languages
Chinese (zh)
Other versions
CN1204724A (en
Inventor
根岸秀夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hino Motors Ltd
Original Assignee
Hino Jidosha Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hino Jidosha Kogyo KK filed Critical Hino Jidosha Kogyo KK
Publication of CN1204724A publication Critical patent/CN1204724A/en
Application granted granted Critical
Publication of CN1128926C publication Critical patent/CN1128926C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

The invention provides a piston ring enduring sufficiently a service life of an internal combustion engine, having an excellent wear/seizure resisting characteristic, and reducing a cost. In the piston ring, a piston ring main unit is constituted by an Fe-Cr-Co system alloy, in a peripheral surface of the piston ring main unit, a nitride layer is formed, in a peripheral surface formed with the nitride layer, a chrome nitride coating of 5 to 25 mu m is formed. The Fe-Cr-Co system alloy is constituted preferable by 3 to 10 wt.% Co, 13 to 20 wt.% Cr, and the rest of Fe.

Description

Piston ring
Technical field
The present invention relates to piston ring, in more detail, is about anti-burn characteristics and the improved piston ring for combustion engines of antiwear characteristic.
Background technique
The piston ring that is used for reciprocating internal-combustion engine requires very high antiwear characteristic.In order to improve this antiwear characteristic of piston ring, adopt the piston ring that on slip surface, forms the hard chromium coating at present mostly as piston ring for combustion engines.
But, along with internal-combustion engine in recent years to running up and the development of high output, the piston ring service condition is also more and more harsher, and this antiwear characteristic that has the piston ring of chromium coating can not meet the demands at present sometimes, and wishing has the better piston ring of antiwear characteristic to replace this existing piston ring.
For addressing this problem, be purpose with the antiwear characteristic that improves the slip surface that has piston ring now, the technology that people have proposed to form nitride layer on the piston ring body surface or covered metal nitride by ion plating.The tunicle that forms by nitride layer or metal nitride, comparing with the hard chromium coating has better antiwear characteristic, compares with the piston ring of present band chromium coating, and people expect to obtain better antiwear characteristic.
Yet, though among Fig. 1 with the nitride layer shown in the dot and dash line with compare with the chromium coating shown in the double dot dash line, have hardness height, advantage that antiwear characteristic is good, but also brought the shortcoming of its anti-burn characteristics, and the problem that this nitride layer is worn away before the internal-combustion engine spreadable life expires has been arranged than chromium coating difference.On the other hand, by the formed tunicle of nitride with compare with the nitride layer shown in the dot and dash line, though have the higher good antiwear characteristic that dots,, because it is short of with the cementability of piston ring and ductility, so peel off from the metal mother metal easily.
In order to address the above problem, proposed on piston ring body, to be pre-formed after the nitride layer, again the scheme that covers with nitride (the special fair 6-10454 of Japan).But, because the anti-combustion characteristic of nitride layer is relatively poor, must be formed on thickness that internal-combustion engine can be fully durable in service life, the above nitride tunicle of 50 μ m degree for example, expose nitride layer to avoid nitride to be worn away.But, the tunicle that adopts the method for above-mentioned ion plating to form by metal nitride, the formation speed of this tunicle is slow during shaping, for the tunicle that forms abundant thickness need take long to, because the production process time is elongated thereby the problem that has the piston ring unit price to significantly improve.
Summary of the invention
The purpose of this invention is to provide a kind of fully durable in the service life of internal-combustion engine, have good antiwear characteristic and anti-combustion characteristic and a cheap piston ring.
The related invention of claim 1 is a kind of piston ring, is that alloy constitutes piston ring body by Fe-Cr-Co, forms nitride layer on the outer circumferential face of piston ring body, is formed with the chromium nitride tunicle of 5～25 μ m on the outer circumferential face that forms nitride layer.
The related invention of claim 2 is a kind of piston ring of making on claim 1 invention basis, and Fe-Cr-Co is that Co is 3～10 weight % in the alloy, and Cr is 13～20 weight %, and all the other are Fe.
Owing on the piston ring body that the alloy that has added cobalt constitutes, form nitride layer, thereby make the surface hardening of piston ring body, and improve the anti-burn characteristics of piston ring body self.
Since on the outer circumferential face of piston ring body, form the chromium nitride tunicle, thereby can improve the antiwear characteristic of piston ring, owing to form the chromium nitride tunicle of 5～25 relatively thinner μ m, thereby can avoid raising of piston ring unit price.
When the chromium nitride tunicle is discontented with 5 μ m, can not obtain enough antiwear characteristics, when the chromium nitride tunicle surpassed 25 μ m, piston ring self unit price will be elevated.
Description of drawings
Fig. 1 is the schematic representation of the abrasion loss relation of expression operating range and piston ring.
Embodiment
Below, describe embodiments of the invention with reference to the accompanying drawings in detail.
Piston ring of the present invention is the apical ring that is used on the I. C. engine piston, and piston ring body is that alloy is made by Fe-Cr-Co.Specifically, Fe-Cr-Co is that alloy is that Co is that 3-10 weight %, Cr are 13-20 weight %, all the other are the alloy of Fe, has also promptly added the alloy of cobalt in so-called stainless steel.On the piston ring body outer circumferential face that the alloy by this interpolation cobalt constitutes, form nitride layer.The formation of this nitride layer is finished by the gas nitriding method, and under the state in the piston ring body insert layer, and to be heated to temperature be to carry out nitriding treatment under 570 ℃ of left and right sides states.Through this nitriding treatment, on the piston ring body surface, form nitride layer, improved the surface strength on piston ring body surface, add cobalt by giving in the alloy that constitutes piston ring body simultaneously, can improve the anti-burn characteristics of piston ring body self.
In addition, on the outer circumferential face of the piston ring body that is formed with nitride layer, also be formed with the chromium nitride tunicle of thickness 5～25 μ m.The formation of this chromium nitride tunicle realizes by the ion plating method.This ion plating method is a kind of of PVD method (physical vapor deposition), the preferred especially reactive ion plating method that allows chromium steam and nitrogen reaction, can form chromium nitride on the outer circumferential face of piston ring body that adopts.The chromium steam is by high energy bundle of rays such as electron beam are shone the chromium evaporation to be obtained, chromium is the element that is easy to form nitride, when making plasma generation in the gas phase of sneaking into the chromium steam at nitrogen, chromium will ionization, forms chromium nitride with the nitrogen ions binding respectively.At this, chromium nitride is according to what of nitrogen delivery volume, and promptly delivery volume forms CrN for a long time, and the nitrogen delivery volume forms Cr at least 2N.
The piston ring of this formation, the chromium nitride tunicle that the piston ring body surface forms plays slip surface, and the abrasion of this chromium nitride tunicle and vehicle driving distance is proportional at first.But because the antiwear characteristic of chromium nitride tunicle is good, its thickness is 5～25 μ m, shown in Fig. 1 solid line, is worn away before expiring during use.After the chromium nitride tunicle was worn away, the nitride layer that the chromium nitride tunicle forms had down been followed the effect of slip surface.
Promptly, on the abrasion loss of piston ring, represent the service limits of piston ring with Fig. 1 dotted line, find when investigating, the piston ring that forms the piston ring of existing chromium coating and form nitride layer is when operating range arrives B point and C point, and the abrasion loss of piston ring has reached service limits.But, because piston ring of the present invention is before arriving the A point, the chromium nitride tunicle that forms on the piston ring body surface plays slip surface, the abrasion of this chromium nitride tunicle and vehicle driving distance are proportional, in addition, and A point beginning from the figure that the chromium nitride tunicle is worn away, nitride layer has been followed the effect of piston ring slip surface, with proportional this nitride layer that then wears away of vehicle driving distance, the result can further extend to the operating range of operating limit the D point.
Though it is poor that nitride layer and chromium nitride tunicle are compared antiwear characteristic, but, at the figure A point that is worn away from the chromium nitride tunicle to the D point, in order to bring into play the function of piston ring, this nitride layer has enough bed thickness, this with compared with regard to the situation of having only nitride layer on piston ring body, to form originally, have sufficient antiwear characteristic.At this,,, can give full play to its function in the remaining period during operating limit so anti-burn characteristics is also fine owing to be added with cobalt in the alloy of this formation piston ring body.
In addition, if the chromium nitride tunicle has enough thickness, when being 50 μ m such as the thickness that forms, as shown in phantom in FIG., though can be more longer to the operating range of piston ring operating limit,, before this tunicle ground off, the life-span of internal-combustion engine itself stopped.Moreover, form enough thick chromium nitride tunicle, can be cause slowly because of the tunicle formation speed, cause that the time of production process is elongated, until the unit price of raising piston ring significantly.
Therefore, according to the present invention, can guarantee antiwear characteristic and anti-burn characteristics owing to reach the nitride layer that forms in chromium nitride tunicle lower floor by the chromium nitride tunicle, thereby, by total run time corresponding to arrival internal-combustion engine operating limit, forming thickness is the relatively thinner chromium nitride tunicle of 5～25 μ m, can obtain in the service life of internal-combustion engine fully durablely, and has the cheap piston ring of good antiwear characteristic and anti-burn characteristics.
Description embodiments of the invention and comparative example.
Embodiment 1
Make the piston ring that is used for the middle cooling of direct spray type turbine diesel engine of the present invention.Promptly, on the outer circumferential face of the piston ring body that forms nitride layer, form the chromium nitride tunicle again being that 3～10 weight %, Cr are 13～20 weight %, all the other are that the Fe-Cr-Co of Fe is the nitride layer that forms 50～100 μ m on the outer circumferential face of the piston ring body made of alloy by Co.The shaping of chromium nitride tunicle is to form CrN by the ion plating method, will form the piston ring of this chromium nitride tunicle of 25 μ m as embodiment 1.
Embodiment 2
With the outer circumferential face of embodiment 1 piston ring same material, identical shaped and big or small piston ring body on form the nitride layer of 50～100 μ m, on the outer circumferential face of the piston ring body that forms nitride layer, form the chromium nitride tunicle again.The shaping of chromium nitride tunicle is to form CrN by the ion plating method, will form the piston ring of this chromium nitride tunicle of 5 μ m as embodiment 2.
Comparative example 1
Make the piston ring that is used for the middle cooling of direct spray type turbine diesel engine.Utilize that Cr is 13～20 weight %, all the other are that the Fe-Cr of Fe is that the Stainless Steel Alloy of alloy is made piston ring body, on the outer circumferential face of this piston ring body, do not form nitride layer, and form the chromium nitride tunicle.The shaping of chromium nitride tunicle is to form CrN by the ion plating method, will form the piston ring as a comparative example 1 of this chromium nitride tunicle of 50 μ m.
Comparative example 2
With the outer circumferential face of the piston ring same material of comparative example 1, identical shaped and big or small piston ring body on do not form nitride layer, and form the chromium nitride tunicle.The shaping of chromium nitride tunicle is to form CrN by the ion plating method, will form the piston ring as a comparative example 2 of this chromium nitride tunicle of 25 μ m.
Comparative example 3
With the outer circumferential face of embodiment 1 piston ring same material, identical shaped and big or small piston ring body on form nitride layer.Be that 3～10 weight %, Cr are 13～20 weight %, all the other are that the Fe-Cr-Co of Fe is the nitride layer that forms 50～100 μ m on the outer circumferential face of the piston ring body made of alloy by Co promptly, but do not form the chromium nitride tunicle, with the piston ring that so forms as a comparative example 3.
Comparative example 4
With the outer circumferential face of the piston ring same material of comparative example 1, identical shaped and big or small piston ring body on form 200～300 μ m chromium coatings, with the piston ring that so forms as a comparative example 4.
Comparative test
The piston ring of the foregoing description 1, embodiment 2 and comparative example 1～4 is installed respectively on the cooling diesel engine in the middle of the direct spray type turbine, and operation is 8000 hours under rated speed.Take out each piston ring behind the end of run,, have or not burn and situation thereof by visual method investigation outer circumferential face with the abrasion loss of profilometer measuring ring outer circumferential face.Its result is with table 1 illustrate.
Table 1
Abrasion loss (μ m) Have or not burn The outer circumferential face situation
Embodiment 1 embodiment 2 32 45 Do not have The chromium nitride tunicle is worn away but does not have burn chromium nitride tunicle and is worn away but do not have burn
Comparative example 1 comparative example 2 comparative examples 3 comparative examples 4 26 33 52 75 Do not have and have or not nothing The remaining chromium nitride tunicle of chromium nitride tunicle is worn away and has burn not have burn does not have burn
Estimate
As can be seen from Table 1, though comparative example 1 do not burn,, form thicker chromium nitride tunicle, the result has raised the unit price of piston ring self.In addition, because the chromium nitride tunicle is worn away and the burn phenomenon is arranged, show and utilize the chromium nitride tunicle of 25 μ m can not bring into play sufficient antiwear characteristic in the comparative example 2.Moreover, in comparative example 3,, compare with the result of comparative example 2 because the phenomenon of not burning takes place, show if utilize the alloy that in stainless steel, adds cobalt to constitute piston ring body, can improve the anti-burn characteristics of piston ring body self.Also have, in the comparative example with chromium plating tunicle 4 as existing product, its abrasion loss is bigger significantly than other piston rings.
Relative with it, on the stainless steel that has added cobalt, form nitride layer, form again among the embodiment 1 and embodiment 2 of thin chromium nitride tunicle, even owing to after the chromium nitride tunicle is worn away, do not burn yet, therefore, show that these two embodiments have sufficient antiwear characteristic and anti-burn characteristics.In addition, can think that why embodiment 2 abrasion loss is bigger than embodiment 1 abrasion loss, be to cause owing to embodiment 2 chromium nitride tunicle earlier is worn away than embodiment 1 chromium nitride tunicle.
As mentioned above,,, on the outer circumferential face of this piston ring body, form nitride layer, therefore, can improve the anti-burn characteristics of piston ring body self owing to being that alloy or Fe-Cr-Ni-Co are that alloy constitutes piston ring body with Fe-Cr-Co if adopt the present invention.In addition, owing on the outer circumferential face that forms nitride layer, also form the chromium nitride tunicle of 5～25 μ m, thereby, under the prerequisite of not raising piston ring self unit price, can further improve the antiwear characteristic of piston ring.The result, according to the present invention, the nitride layer that utilizes chromium nitride layer and form at the chromium nitride layer downside can be guaranteed antiwear characteristic and anti-burn characteristics, can obtain piston ring fully durable, that have good antiwear characteristic and anti-burn characteristics and cheapness in the time limit that internal-combustion engine uses.

Claims (2)

1. a piston ring is characterized in that, is that alloy constitutes piston ring body by Fe-Cr-Co, forms nitride layer on the outer circumferential face of described piston ring body, is formed with the chromium nitride tunicle of 5～25 μ m on the described outer circumferential face that forms described nitride layer.
2. piston ring as claimed in claim 1 is characterized in that Fe-Cr-Co is the Co of alloy by 3～10 weight %, the Cr of 13～20 weight %, and surplus is that Fe forms.
CN98102968A 1997-06-10 1998-06-10 Piston ring Expired - Fee Related CN1128926C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP9151802A JPH112323A (en) 1997-06-10 1997-06-10 Piston ring
JP151802/97 1997-06-10
JP151802/1997 1997-06-10

Publications (2)

Publication Number Publication Date
CN1204724A CN1204724A (en) 1999-01-13
CN1128926C true CN1128926C (en) 2003-11-26

Family

ID=15526629

Family Applications (1)

Application Number Title Priority Date Filing Date
CN98102968A Expired - Fee Related CN1128926C (en) 1997-06-10 1998-06-10 Piston ring

Country Status (3)

Country Link
JP (1) JPH112323A (en)
KR (1) KR100303243B1 (en)
CN (1) CN1128926C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8404895L (en) * 1984-10-01 1986-03-17 Torkel Ingemar Fischer MEANS OF A SENSITIVITY TEST
EP3191654B1 (en) 2014-09-08 2024-06-12 S.C. Johnson & Son, Inc. A dispenser system for treating a toilet
CN110343993A (en) * 2019-08-07 2019-10-18 广东工业大学 A kind of carbide surface processing method and application

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6036759A (en) * 1983-08-10 1985-02-25 Teikoku Piston Ring Co Ltd Piston ring for internal-combustion engine
JPH01182668A (en) * 1988-01-15 1989-07-20 Riken Corp Piston ring

Also Published As

Publication number Publication date
JPH112323A (en) 1999-01-06
KR19990006772A (en) 1999-01-25
CN1204724A (en) 1999-01-13
KR100303243B1 (en) 2001-10-19

Similar Documents

Publication Publication Date Title
US9103015B2 (en) Sliding element and method for coating a sliding element
Vetter et al. Surface treatment selections for automotive applications
JP3355306B2 (en) piston ring
EP1154035B1 (en) Amorphous carbon film containing oxide
US9169547B2 (en) Gliding element
JP4334354B2 (en) Piston ring with PVD coating layer
GB2343496A (en) A sliding member, eg a piston ring, with a diamond-like carbon (DLC) film
EP2162561B1 (en) Piston ring with a sulphonitriding treatment
WO2001033065A1 (en) Combination of cylinder liner and piston ring of internal combustion engine
CN1928148A (en) Wear resistant coating and process of its manufacture
CN102666925A (en) Sliding element, in particular piston ring, and combination of a sliding element with a mating running element
US10697543B2 (en) Sliding element, in particular piston ring, and method for producing the same
JP2017502219A (en) Sliding combination
CN1128926C (en) Piston ring
CN102933748B (en) For the spirality Compress Spring of oil-scraping ring and the method for coating spirality Compress Spring of internal combustion engine piston
JP2003113941A (en) Piston ring and combination structure of piston ring and ring groove of piston
JP2730571B2 (en) Sliding material and piston ring
JP4067678B2 (en) Combination oil ring spacer expander and combination oil ring
KR100706387B1 (en) Coating method of engine valve cap
CN201180590Y (en) High abrasion-proof piston ring
JP2002266697A (en) Slide member and manufacturing method thereof
CN108603278B (en) Coated piston ring with protective layer
US9777239B2 (en) Element comprising at least one sliding surface having a coating for use in an internal combustion engine or a compressor
JPH11229958A (en) Combination of piston rings for internal combustion engine
JP3123258B2 (en) Adjusting shim and manufacturing method thereof

Legal Events

Date Code Title Description
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20031126