US3897759A - Plug hole of a rotary piston engine - Google Patents

Plug hole of a rotary piston engine Download PDF

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Publication number
US3897759A
US3897759A US475182A US47518274A US3897759A US 3897759 A US3897759 A US 3897759A US 475182 A US475182 A US 475182A US 47518274 A US47518274 A US 47518274A US 3897759 A US3897759 A US 3897759A
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US
United States
Prior art keywords
hole
plug
ignition
rotor
seen
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
US475182A
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English (en)
Inventor
Yoshio Sasaki
Tsuyoshi Yamazaki
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Toyota Motor Corp
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Toyota Motor Corp
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Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
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Publication of US3897759A publication Critical patent/US3897759A/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
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/12—Ignition
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • 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
    • F02B2053/005—Wankel engines
    • 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

  • a plug hole of a rotary piston engine includes said hole includl30
  • This invention relates generally to a rotary piston engine and, more particularly, a plug hole of a rotary piston engine, said engine being of the type comprising a casing composed of a center housing having a trochoidal inner peripheral surface and side housings closing opposite sides of said center housing and a polygonal rotor adapted to rotate eccentrically in said casing with its apex seals provided at its apex portions contacting said inner peripheral surface of said center housing, said plug hole comprising a plug mounting hole and an ignition hole which communicates with said plug mounting hole and opens to said inner peripheral surface of said center housing at a position located behind the short axis of trochoid as seen in the rotational direction of the rotor.
  • a cylindrical housing forming the tip portion of an ignition plug must be formed with an annular groove along its outer peripheral portion and a number of radial openings which open to said annular groove so as to establish a flow passage which connects the ignition hole to said passage and, accordingly, this system is bound with a drawback that the structure of the tip portion of the spark plug becomes rather complicated.
  • the abovementioned object is accomplished by a plug hole of the constitution as described in the opening paragraph of this specification, characterized in that said ignition hole is formed with a notch at a front portion thereof as seen in the rotational direction of the rotor, said notch operating to lead combustible gases residing in a trailing portion of a preceding combustion chamber performing a combustion stroke into said plug mounting hole when one of said apex seals traverses said ignition hole.
  • said notch should preferably be narrower than the diameter of said ignition hole and stretched as inclined with respect to the axis of said ignition hole.
  • Said notch may be provided in substantially the same manner in either case where said ignition hole is substantially aligned with said plug mounting hole along the same axis, said ignition hole is displaced forward as seen in the rotational direction of the rotor with respect to said plug mounting hole, or said ignition hole is displaced rearward as seen in the rotational direction of the rotor with respect to said plug mounting hole.
  • combustible gases residing in a trailing portion of the preceding combustion chamber performing a combustion stroke is introduced into the plug mounting hole through said notch when an apex seal traverses the ignition hole, whereby good scavenging of a passage extending from the plug mounting hole to the ignition hole is accomplished.
  • FIG. 1 is a sectional view showing a basic structure of a rotary piston engine, wherein, however, the rotor is shown in its side view to show its side structure;
  • FIG. 2 is a sectional view of a plug hole portion showing the structure of the plug hole according to this invention, wherein, however, the rotor is shown in its side view to show its side structure;
  • FIG. 3 is a view of an inner peripheraal surface of the center housing taken in the direction of arrows DD in FIG. 2, showing the cross sectional structure of the ignition hole and said notch;
  • FIGS. 4 and 5 are views similar to FIG. 2, showing modifications of the plug hole structure according to this invention.
  • FIG. 1 shows a general structure of a rotary piston engine which comprises a center housing I having a trochoidal inner peripheral surface and side housings 2 closing opposite ends of said center housings thereby to form a casing in which a polygonal rotor 3 rotates eccentrically about an eccentric shaft 5 with its apex seals 4 provided at its apex portions contacting said inner peripheral surface of said center housing.
  • the rotary piston engine of this type may be constituted in two different structures wherein either a spark plug 6 is positioned behind the short axis of trochoid CC as seen in the rotational direction of the rotor or a spark plug 6' is positioned before said axis as seen in the rotational direction of the rotor.
  • this invention relates to the plug hole structure which employs the plug 6 positioned behind said short axis of trochoid CC as seen in the rotational direction of the rotor.
  • reference numerals 7 and 8 designate annular oil seal means to keep oil and gas tightness between a side wall of the rotor and an inner wall of the side housing.
  • 9 is a side seal to keep oil and gas tightness at peripheral edge portions of the rotor, and 10 is a corner seal.
  • FIG. 2 shows a basic embodiment of the plug hole structure according to this invention.
  • the portions corresponding to those shown in FIG. 1 are designated by the same reference numerals as in FIG. 1.
  • the tip portion of the spark plug 6 is mounted in a plug mounting hole II formed in the center housing 1, said plug mounting hole communicating to the combus tion chamber of the engine defined between the center housing I and the rotor 3 by way of an ignition hole 12 which connects with said plug mounting hole at one end thereof and opens to the inner peripheral surface of the center housing 1 at a position located behind the short axis of the trochoid CC as seen in the rotational direction of the rotor.
  • the ignition hole I2 is formed with a notch I3 at a front portion thereof as seen in the rotational direction of the rotor according to this invention.
  • the notch I3 is, as better shown in FIG. 3 which shows the opening shape thereof, narrower than the diameter of the ignition hole 12, and stretched, as shown in FIG. 2, as inclined with respect to the axis of the ignition hole I2.
  • a part of combustion gases which is rich in combustible gases and resides in a trailing portion of the combustion chamber B performing a combustion stroke is introduced into the plug mounting hole II through said notch I3 and further flows into the combustion chamber A through the ignition hole 12 while scavenging the plug mounting hole and the ignition hole due to a pressure difference between the combustion chambers B and A, the pressure in the former chamber being substantially higher than that in the latter chamber.
  • FIG. 4 is a view similar to FIG. 2, showing a modification of the plug hole incorporating the notch according to this invention.
  • the portions corresponding to those shown in FIG. 2 are designated by the same reference numerals as in FIG. 2.
  • the ignition hole 12 is displaced forward with respect to the plug mounting hole II as seen in the rotational direction of the rotor so far that the front faces, as seen in the rotational direction of the rotor, of the plug mounting hole and the ignition hole are aligned with each other.
  • a substantially same scavenging of the plug mounting hole as in the case of the structure shown in FIG. 2 is obtained by providing the notch I3.
  • FIG. 5 is a view similar to FIG. 2 or 4, showing another modification of the plug hole structure according to this invention, wherein the ignition hole is displaced rearward as seen in the rotational direction of the rotor with respect to the plug mounting hole.
  • the portions corresponding to those shown in FIG. 2 or 4 are designated by the same reference numerals as in FIg. 2 or 4. It has also been confirmed that, in the arrangement of the plug mounting hole II and the ignition hole 12 as shown in FIG. 5, substantially same scavenging of the plug mounting hole as in the case of the structure shown in FIG. 2 or 4 is attained.
  • the structure of the plug hole incorporating the notch according to this invention is very simple, yet effective scavenging of the plug mounting hole is accomplished by utilizing the pressure difference residing between two combustion chambers defined at opposite sides of an apex seal.
  • a plug hole of a rotary piston engine said engine being of the type comprising a casing composed of a center housing having a trochoidal inner peripheral surface and side housings closing opposite sides of said center housing and a polygonal rotor adapted to rotate eccentrically in said casing with its apex seals provided at its apex portions contacting said inner peripheral surface of said center housing, said plug hole comprising a plug mounting hole and an ignition hole which communicates with said plug mounting hole and opens to said inner peripheral surface of said center housing at a position located behind the short axis of trochoid as seen in the rotational direction of the rotor, characterized in that said ignition hole is formed with a notch at a front portion thereof as seen in the rotational direction of the rotor, said notch operating to lead com bustibIe gases residing in a trailing portion of a preceding combustion chamber performing a combustion stroke into said plug mounting hole when one of said apex seals traverses said ignition hole.
  • a plug hole according to claim I wherein said ignition hole is displaced rearward as seen in the rotational direction of the rotor with respect to said plug mounting hole.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
US475182A 1974-04-15 1974-05-31 Plug hole of a rotary piston engine Expired - Lifetime US3897759A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP49042036A JPS50135411A (enrdf_load_stackoverflow) 1974-04-15 1974-04-15

Publications (1)

Publication Number Publication Date
US3897759A true US3897759A (en) 1975-08-05

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ID=12624916

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Application Number Title Priority Date Filing Date
US475182A Expired - Lifetime US3897759A (en) 1974-04-15 1974-05-31 Plug hole of a rotary piston engine

Country Status (3)

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US (1) US3897759A (enrdf_load_stackoverflow)
JP (1) JPS50135411A (enrdf_load_stackoverflow)
DE (1) DE2424865C2 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007714A (en) * 1975-10-14 1977-02-15 Curtiss-Wright Corporation Spark plug and rotary engine combination
US20160108804A1 (en) * 2014-10-21 2016-04-21 Steven Edward Pardue Oscillating Rotary Engine
US20160245167A1 (en) * 2013-11-03 2016-08-25 Shai Barkan Rotary oscillating internal combustion engine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747542A1 (de) * 1977-10-22 1979-04-26 Fritz Zimmermann Drehkolbenmotor
AT512152B1 (de) * 2011-12-19 2013-06-15 Avl List Gmbh Rotationskolbenmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777720A (en) * 1972-01-07 1973-12-11 R Williams Rotary internal combustion engine
US3848574A (en) * 1972-06-03 1974-11-19 Kawasaki Heavy Ind Ltd Combustion promoting improvement in rotary engine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4214805Y1 (enrdf_load_stackoverflow) * 1965-05-06 1967-08-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777720A (en) * 1972-01-07 1973-12-11 R Williams Rotary internal combustion engine
US3848574A (en) * 1972-06-03 1974-11-19 Kawasaki Heavy Ind Ltd Combustion promoting improvement in rotary engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007714A (en) * 1975-10-14 1977-02-15 Curtiss-Wright Corporation Spark plug and rotary engine combination
US20160245167A1 (en) * 2013-11-03 2016-08-25 Shai Barkan Rotary oscillating internal combustion engine
US20160108804A1 (en) * 2014-10-21 2016-04-21 Steven Edward Pardue Oscillating Rotary Engine
US9708975B2 (en) * 2014-10-21 2017-07-18 Steven Edward Pardue Oscillating rotary engine

Also Published As

Publication number Publication date
DE2424865B1 (de) 1975-06-05
JPS50135411A (enrdf_load_stackoverflow) 1975-10-27
DE2424865C2 (de) 1976-01-29

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