US3851627A - Rotor housing structure for rotary piston engine - Google Patents

Rotor housing structure for rotary piston engine Download PDF

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Publication number
US3851627A
US3851627A US00360531A US36053173A US3851627A US 3851627 A US3851627 A US 3851627A US 00360531 A US00360531 A US 00360531A US 36053173 A US36053173 A US 36053173A US 3851627 A US3851627 A US 3851627A
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US
United States
Prior art keywords
rotor housing
iron sheet
housing structure
adapter
hole
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
US00360531A
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English (en)
Inventor
Y Terazawa
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.)
Mazda Motor Corp
Original Assignee
Toyo Kogyo 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 Toyo Kogyo Co Ltd filed Critical Toyo Kogyo Co Ltd
Application granted granted Critical
Publication of US3851627A publication Critical patent/US3851627A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B55/00—Internal-combustion aspects of rotary pistons; Outer members for co-operation with rotary pistons
    • F02B55/08—Outer members for co-operation with rotary pistons; Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/12—Ignition
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • ternal combustion engine of rotary piston type which comprises a rotor housing substrate formed with an ignition plug hole, an adapter of high heat-conductive material and defining therein a shootin electroplated layer.
  • an g structure furer comprises as a novel element an iron sheet of 5 000 m N 7 H3 6 85 9 mm DW mm y.” uhm 1m r. 0m u .l rm 0 W mm D n" 0" "n Um a u” m mm D .J u D. mm mm m1 mm .11 L I. ml C V. M. a .m M U1 1 ll 0 2 3 55 ll considerable thickness which is interposed between Fleld of Search................. 8.0.9, the s g substrate and the electroplated layer. 418/178 204/49
  • the adapter has its inner end welded to the iron sheet and accordingly reinforced by the iron sheet [56] References Cited UNITED STATES PATENTS which in turn provides an excellent substrate for the electroplate layer.
  • the present invention relates to improvements in engine construction of an internal combustion engine of rotary piston type, and, more particularly, to improvements in a rotor housing structure of the rotary piston engine.
  • the present Applicant has proposed-such a rotor housing structure as is disclosed in Japanese Utility Model Publication No. 71 20087.
  • an adapter which is made of copper or the like metal having a sufficient heat-conductivity is mounted in an ignition plug hole, which is formed in the rotor housing substrate, so as to define therein a shooting hole.
  • the rotor housing substrate is usually made of light metal alloy and is covered at its inner surface with a hard chromium layer of high wearresistivity. The covering of the chromium layer is, on the other hand, performed by the electroplating process, but the direct application of the particular layer to the rotor housing substrate is known quite difficult.
  • the rotor housing substrate is at first sprayed with a metal such as iron, and then chromium is electroplated on the iron layer. Since, however, the sprayed iron layer itself is considerably brittle and accordingly the brazing of the adapter to the iron layer can not provide firm adhesion inbetween, the overlying chromium layer is liable to peeling so that the chromium strips thus peeled will constitute an obstacle to the rotational motion of the rotor.
  • the chromium layer is omitted or removed on purpose at the position which is to overlie the inner end of the adapter.
  • an annular groove is necessarily formed between the inner portion of the adapter and the adjacent chromium layer to provide a spacing inbetween, and carbon particles formed in the course of the engine operation will be deposited or gathered in the groove to invite excessive and/or unbalanced wearing of an apex sealing member which is carried on the apex portion of the rotor.
  • an object of the present invention to provide an improved rotor housing structure which is free from cracks which might otherwise be formed at the inner peripheral edge of a shooting hole due to the presence of thermal stress.
  • Another object of the present invention is to provide an improved rotor housing structure in which peeling of the chromium layer in the vicinity hole is prevented in advance.
  • an iron sheet of substantial thickness is interposed or sandwiched between the rotor housing substrate and the chromium layer.
  • the housing substrate is cast to the outside wall of the iron sheet and the iron sheet has an inwardly diverging hole which Fegisters at its outermost end with the innermost end of a shooting hole deof the shooting fined by the adapter.
  • the adapter has its inner end welded to the iron sheet and reinforced by the iron sheet which in turn provides an excellent substrate for the electroplating of the chromium layer.
  • FIGS. 1 and 2 generally designated at numeral 10 is an internal combustion engine of rotary piston type, which is provided as customary with a rotor 11 of polygonal shape.
  • This rotor 11 is rotatably received within a multi-lobed rotor housing 12, to a peripheral portion of which an ignition plug 13 is attached to ignite the introduced combustible mixture.
  • it is technically difficult to locate a shooting hole 14 of the ignition plug 13 in the vicinity of a water jacket 15, which is formed in the rotor housing 12 for passing therethrough cooling water.
  • the portion of the rotor housing 12 adjacent to the shooting hole 14 cannot be cooled down so much by the cyclically introduced mixture in comparison with the usual reciprocating'engine.
  • the metal material constituting the rotor housing 12 is subjected, during, the engine operation, to local over-heating to thereby invite substantial deterioration in mechanical strength of the used metal material, as has been shortly discussed in the beforehand.
  • the material of the portion forming the shooting hole 14, in other words, the afore-mentioned adapter has a coefficient of thermal expansion which is quite different from that of the rotor housing substrate.
  • a rotor housing structure acwardly reduced shooting hole 14 for allowing an ignition spark of the plug 13 to pass therethrough.
  • Said adapter 18 has an inside wall which is secured, preferably by welding or brazing, to the outside wall of the iron sheet 17.
  • the material of the rotor housing substrate 12 is cast around the iron sheet 17 and the adapter 18.
  • the iron sheet 17 has an inwardly diverging hole which registers at its outermost end with the innermost end of the shooting hole 14 in the adapter 18.
  • the adapter 18 has its inner end welded to the iron sheet 17 and accordingly reinforced by the iron sheet 17 which in turn provides an excellent substrate for the electroplated chromium or nickel layer 19.
  • the rotor housing structure of the present invention is free from cracks which might otherwise be formed at the inner peripheral edge of the shooting hole 14 due to the presence of the thermal stress. It should also be appreciated that the possible peeling of the electroplated layer 19 in the vicinity of the shooting hole 14 is precluded as a result of sufi'rcient adhesiveness with the iron sheet 17.
  • a rotor housing structure for an internal combustion engine of rotary piston type comprising:
  • an adapter formed with an inwardly reduced shooting hole and welded to the outside of said iron sheet with the outermost end of said diverging hole registering with the innermost end of said shooting hole;
  • a rotor housing structure according to claim 1 wherein said electroplated layer is made of chromium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
US00360531A 1972-05-16 1973-05-15 Rotor housing structure for rotary piston engine Expired - Lifetime US3851627A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972057045U JPS5143294Y2 (en, 2012) 1972-05-16 1972-05-16

Publications (1)

Publication Number Publication Date
US3851627A true US3851627A (en) 1974-12-03

Family

ID=13044465

Family Applications (1)

Application Number Title Priority Date Filing Date
US00360531A Expired - Lifetime US3851627A (en) 1972-05-16 1973-05-15 Rotor housing structure for rotary piston engine

Country Status (3)

Country Link
US (1) US3851627A (en, 2012)
JP (1) JPS5143294Y2 (en, 2012)
DE (1) DE2324348C3 (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099490A (en) * 1972-02-01 1978-07-11 Daimler-Benz Aktiengesellschaft Method for producing a housing casing for a rotary piston internal combustion engine
US4755116A (en) * 1986-03-18 1988-07-05 Mazda Motor Corporation Rotor housing for a rotary piston engine having softened areas surrounding the plug holes
US20140202419A1 (en) * 2011-12-19 2014-07-24 Avl List Gmbh Rotary piston engine
US9377199B2 (en) 2012-12-28 2016-06-28 General Electric Company Methods of reinforcing combustor aperture and related combustor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52150034U (en, 2012) * 1976-05-11 1977-11-14

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155313A (en) * 1962-10-01 1964-11-03 Cuertiss Wright Corp Rotor housing construction of rotating combustion engine
US3512907A (en) * 1968-04-25 1970-05-19 Nsu Motorenwerke Ag Rotary combustion engine
US3705818A (en) * 1968-12-31 1972-12-12 Citroen Sa Methods of coating rubbing surfaces and elements comprising such surfaces
US3722480A (en) * 1971-12-20 1973-03-27 Curtiss Wright Corp Rotary combustion engine with improved firing channel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155313A (en) * 1962-10-01 1964-11-03 Cuertiss Wright Corp Rotor housing construction of rotating combustion engine
US3512907A (en) * 1968-04-25 1970-05-19 Nsu Motorenwerke Ag Rotary combustion engine
US3705818A (en) * 1968-12-31 1972-12-12 Citroen Sa Methods of coating rubbing surfaces and elements comprising such surfaces
US3722480A (en) * 1971-12-20 1973-03-27 Curtiss Wright Corp Rotary combustion engine with improved firing channel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4099490A (en) * 1972-02-01 1978-07-11 Daimler-Benz Aktiengesellschaft Method for producing a housing casing for a rotary piston internal combustion engine
US4755116A (en) * 1986-03-18 1988-07-05 Mazda Motor Corporation Rotor housing for a rotary piston engine having softened areas surrounding the plug holes
US20140202419A1 (en) * 2011-12-19 2014-07-24 Avl List Gmbh Rotary piston engine
US9377199B2 (en) 2012-12-28 2016-06-28 General Electric Company Methods of reinforcing combustor aperture and related combustor

Also Published As

Publication number Publication date
JPS5143294Y2 (en, 2012) 1976-10-21
DE2324348C3 (de) 1975-11-20
DE2324348B2 (de) 1975-04-10
JPS4915307U (en, 2012) 1974-02-08
DE2324348A1 (de) 1973-11-22

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