US3877854A - Relative combination of apex seal and rotor housing in rotary piston internal combustion engine - Google Patents

Relative combination of apex seal and rotor housing in rotary piston internal combustion engine Download PDF

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Publication number
US3877854A
US3877854A US395874A US39587473A US3877854A US 3877854 A US3877854 A US 3877854A US 395874 A US395874 A US 395874A US 39587473 A US39587473 A US 39587473A US 3877854 A US3877854 A US 3877854A
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US
United States
Prior art keywords
rotor housing
apex seal
cast
internal combustion
combustion engine
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
Application number
US395874A
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English (en)
Inventor
Takao Sasame
Kentaro Takahashi
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.)
Nippon Piston Ring Co Ltd
Original Assignee
Nippon Piston Ring Co Ltd
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 Nippon Piston Ring Co Ltd filed Critical Nippon Piston Ring Co Ltd
Application granted granted Critical
Publication of US3877854A publication Critical patent/US3877854A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C19/00—Sealing arrangements in rotary-piston machines or engines
    • F01C19/005—Structure and composition of sealing elements such as sealing strips, sealing rings and the like; Coating of these elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/937—Sprayed metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12583—Component contains compound of adjacent metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component

Definitions

  • wt,% having the thickness of more than 0.1 mm at least on the sliding surface thereof and the rotor housing is provided with a cast-iron member of which graphite is precipitated on the surface thereof in the range from 1 to 15%, by area, based on the surface area of the cast-iron member at least on the sliding surface on which the apex is'slided, 'whereby the wear and scuffing resistances of both sliding surfaces of the apex seal and the rotor housing are improved.
  • a rotor housing which is made of a light alloy, such as Al, as its base metal, in a rotary piston internal combustion engine is provided with a nickel plated layer having a hardened part of hard chrome, silicon carbide, etc.. on the sliding surface thereof on which an apex seal is slided, however, manufacturing processes for applying the plating treatment to the sliding surface of the rotor housing and machining process after applying the plating treatment are considerably complex because the shape of the sliding surface of the rotor housing is very complex. As a result of this, the cost ofthe article becomes dear.
  • chatter mark which is considered to be resulted mainly from a discontinuity of the lubrication between the apex seal and the rotor housing has not been solved completely.
  • a primary object of this invention is to provided the relative combination of an apex seal and a rotor housing in a rotary piston internal combustion engine which exhibit high wear and scuffing resistances on both sliding surfaces of the apex seal and the rotor housing so that the durability of the engine may increase.
  • Another object of this invention is to provide the relative combination of an apex seal and a rotor housing in a rotary piston internal combustion engine which overcomes the problem of chatter mark" which is considered to be resulted mainly from a discontinuity of the lubrication between the apex seal and the rotor housing.
  • Another object of this invention is to provide an apex seal and a rotor housing which have high wear and scuffing resistances and which are produced very economically.
  • an apex seal which is made of a ferrous or nonferrous metal as its base metal and which is provided with a sprayed layer of Fe-O compound, which contains oxygen in the range from 15.0 to 30.05 wt.%, having the thickness of more than 0.l mm is used in a rotary piston internal combustion engine in the relative combination with a rotor housing which is provided with a cast-iron member of which graphite is precipitated on the surface thereof in the range from I to bv area, based on the surface area of the cast-iron member.
  • the amount of oxygen in the FeO compound sprayed at least on the sliding surface of the apex seal is closely relative to the self-lubrication of the apex seal, and accordingly restricted to the above described range, namely from 15.0 to 30.05 wt.%.
  • the thickness of the sprayed layer of the Fe-O'compound must be at least 0.1 mm. Because, if the thickness is not more than 0.1 mm. the desired durability of the apex seal will not be expected. And the upper limit of the thickness is determined from the results of many experiments and from the economical reason, and is preferably 5 mm or less.
  • the cast-iron member is formed at least on the sliding surface of the rotor housing by casting a body of the rotor housing with a cast-iron or, in view of lightening the weight of the rotor housing body and of the radiation of heat on the rotor housing, by fixing the cast-iron member at least to the sliding surface of the rotor housing made of a light alloy, such as Al or the like, as its base metal by a metallurgic method, such as included casting, etc., or a mechanical method, such as the press-fitting, etc.
  • a light alloy such as Al or the like
  • the shape of graphite precipitated on the surface of the cast-iron member, which functions as the sliding surface of the rotor housing, in the range from 1 to 15 71, by area, based on the sliding surface of the rotor housing may be effectually selected from flakes globales and spherical.
  • the precipitating amount of graphite is determined in the range from I to 15 by area, based on the sliding surface of the rotor housing.
  • the castiron member having the hardness in the range of 150 to 300 HB may be used preferably. But, at least one element selected from the group consisting of Cr, B, Mo, etc., which form a carbide is effectually contained in the cast-iron member or a proper heat treatment is subjected to the cast-iron member since the cast-iron member must be possessed of the durability and a high hardness in response to the type of the engine. In the case of this, the hardness of the cast-iron member becomes in the range from 300 to 700 HB.
  • FIG. 1 showing an enlarged photograph which shows a microstructure (magnitude of a sprayed layer of Fe-O compound formed on the sliding surface of an apex seal according to this invention
  • a white part indicates the sprayed layer of FeO compound containing oxygen therein in the range from 15.0 to 30.05 wt.% and black parts indicate void spaces formed into the sprayed layer during the spraying treatment.
  • Such structure of the sprayed layer exhibits the excellent wear resistance and scuffing resistance due to the self-lubricating property of the Fe-O compound. Besides, the void spaces in the sprayed layer cause the porous and oil-impregnating structure. As the Fe-O compound is readily converted into drops during the spraying treatment due to the relatively low melting point (about l;500C), the sprayed particles are mutually entangled to increase the strength of the sprayed layer itself. Accordingly, the acceleration of the abrasion of the apex seal and the rotor housing by the peeled off particles is never coused.
  • the sliding surface of the rotor housing exhibits the wear and'scuffing resist- .v ances due to mutual effect of the oil -humidity and the self-lubricating property which are peculiar 't'ograph'i'te, at the sameotime, .graphitefunc'tions'to absorb loadof the apex seal to the rotor housing caused by the mechanical vibration of the engine, thereby resulting in the stable operation of the apex seal.
  • the combination of the apex seal and the rotor housing according to this invention brings out unexpectedly high wear resistance therebetween, and reduces the forming of the scuffing due to mutual effect of the self-lubricating property and the oil- Elemen Total c Si Mn P 5 Fe Content (Wtzfi) 3.25 L82 0.55 0.20 0.07 balance
  • Matrix structure pearlite Shape of graphite: The precipitating amount of graphite: Hardness: 215 (HB) flakes of graphite 9.8 71 (by area)
  • the apex seal and the rotor housing thus treated wear combined with each other, and the combination was subjected to the wear resistance test in the actual engine.
  • test conditions i l. rotating number; 2680 r.p.m. 2. boosting pressure; -350 mm.Hg. 3. running time; 50 hr.
  • Cr plating layer (having the thickness of 0.15 mm and the hardness of 950 Hv) is provided on the sliding surimpregna ing pr p y of h li ing surface of the p 30 face thereof under the following plating conditions and plating conditions of the Cr plating layer;
  • liquid temp. in the plating bath 60C composition of the liquid
  • EXAMPLE I A Fe0 compound containing 27.6 wt.% of oxygen was plasma-sprayed on the sliding surface of cast-iron apex seal made of the castiron (.llS FC-) as its base metal to form the layer of 1 mm thickness.
  • the Hv() hardness of the resultant sprayed layer was 700.
  • the spraying conditions were as follows:
  • a rotor housing is formed by casting with the following cast-iron.
  • the chatter mark is not observed in the combination according to'this invention.
  • EXAMPLE 3 The scuffing resistance test was carried out with using the rotary type wear resistance tester.
  • Aspecimen having the sprayed surface layer was thrusted on a turn table which was rotated supplying the lubricating oil between the surface layer of the specimen and the upper surface of the turn table.
  • testing conditions 1. testing specimen;
  • the base metal of the apex seal is not restricted to the castiron, but may be Al, Cu or the like nonferrous metals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sliding-Contact Bearings (AREA)
US395874A 1972-09-12 1973-09-10 Relative combination of apex seal and rotor housing in rotary piston internal combustion engine Expired - Lifetime US3877854A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47090912A JPS513842B2 (cs) 1972-09-12 1972-09-12

Publications (1)

Publication Number Publication Date
US3877854A true US3877854A (en) 1975-04-15

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Family Applications (1)

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US395874A Expired - Lifetime US3877854A (en) 1972-09-12 1973-09-10 Relative combination of apex seal and rotor housing in rotary piston internal combustion engine

Country Status (3)

Country Link
US (1) US3877854A (cs)
JP (1) JPS513842B2 (cs)
GB (1) GB1424909A (cs)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4132419A (en) * 1976-05-31 1979-01-02 Toyo Kogyo Co., Ltd. Oil seal ring for rotary piston engines
US4212602A (en) * 1974-08-14 1980-07-15 Goetzewerke Friedrich Goetze Ag Wear-resistant coating for sealing strips in rotary engines
US4936912A (en) * 1988-06-27 1990-06-26 Deere & Company Sintered apex seal material
US5087181A (en) * 1989-03-06 1992-02-11 Hitachi, Ltd. Sliding structure such as compressor or the like
US8156919B2 (en) * 2008-12-23 2012-04-17 Darrow David S Rotary vane engines with movable rotors, and engine systems comprising same

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH578432A5 (cs) * 1973-03-05 1976-08-13 Ciba Geigy Ag
CH565945A5 (cs) * 1973-07-26 1975-08-29 Hartig Gunter
JPS5613322B2 (cs) * 1975-02-24 1981-03-27
JPS51101639A (ja) * 1975-03-03 1976-09-08 Soichi Hisada Nainenkikannotenkasochi
JPS5846671B2 (ja) * 1975-11-19 1983-10-18 株式会社日立製作所 自動車エンジン制御用点火装置
JPS52107444A (en) * 1976-03-05 1977-09-09 Hitachi Ltd Ignition timing controller for internal-combustion engine
JPS5559167U (cs) * 1978-10-16 1980-04-22

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311240A (en) * 1939-11-20 1943-02-16 Ramsey Accessories Mfg Corp Coating for piston rings
US3033180A (en) * 1960-01-29 1962-05-08 Curtiss Wright Corp Rotating combustion engine seal construction
US3061525A (en) * 1959-06-22 1962-10-30 Platecraft Of America Inc Method for electroforming and coating
US3289649A (en) * 1963-09-26 1966-12-06 Daimler Benz Ag Rotary piston engine
US3513084A (en) * 1968-06-28 1970-05-19 Du Pont Lubricant producing system
US3731941A (en) * 1970-12-12 1973-05-08 Nippon Piston Ring Co Ltd Facing materials for an internal combustion engine cylinder and a cooperating piston ring

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2311240A (en) * 1939-11-20 1943-02-16 Ramsey Accessories Mfg Corp Coating for piston rings
US3061525A (en) * 1959-06-22 1962-10-30 Platecraft Of America Inc Method for electroforming and coating
US3033180A (en) * 1960-01-29 1962-05-08 Curtiss Wright Corp Rotating combustion engine seal construction
US3289649A (en) * 1963-09-26 1966-12-06 Daimler Benz Ag Rotary piston engine
US3513084A (en) * 1968-06-28 1970-05-19 Du Pont Lubricant producing system
US3731941A (en) * 1970-12-12 1973-05-08 Nippon Piston Ring Co Ltd Facing materials for an internal combustion engine cylinder and a cooperating piston ring

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212602A (en) * 1974-08-14 1980-07-15 Goetzewerke Friedrich Goetze Ag Wear-resistant coating for sealing strips in rotary engines
US4132419A (en) * 1976-05-31 1979-01-02 Toyo Kogyo Co., Ltd. Oil seal ring for rotary piston engines
US4936912A (en) * 1988-06-27 1990-06-26 Deere & Company Sintered apex seal material
US5087181A (en) * 1989-03-06 1992-02-11 Hitachi, Ltd. Sliding structure such as compressor or the like
US8156919B2 (en) * 2008-12-23 2012-04-17 Darrow David S Rotary vane engines with movable rotors, and engine systems comprising same

Also Published As

Publication number Publication date
GB1424909A (en) 1976-02-11
JPS4946010A (cs) 1974-05-02
DE2345683B2 (de) 1975-11-13
JPS513842B2 (cs) 1976-02-06
DE2345683A1 (de) 1974-04-11

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