US3199495A - Timing devices for rotary engines - Google Patents

Timing devices for rotary engines Download PDF

Info

Publication number
US3199495A
US3199495A US115809A US11580961A US3199495A US 3199495 A US3199495 A US 3199495A US 115809 A US115809 A US 115809A US 11580961 A US11580961 A US 11580961A US 3199495 A US3199495 A US 3199495A
Authority
US
United States
Prior art keywords
rotor
cam
stator
contour
valve
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
US115809A
Other languages
English (en)
Inventor
Peras Lucien
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.)
Renault SA
Original Assignee
Renault SA
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 Renault SA filed Critical Renault SA
Application granted granted Critical
Publication of US3199495A publication Critical patent/US3199495A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02B53/04—Charge admission or combustion-gas discharge
    • F02B53/06—Valve control therefor
    • 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
    • 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
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
    • 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
    • F02B2730/00—Internal-combustion engines with pistons rotating or oscillating with relation to the housing
    • F02B2730/01—Internal-combustion engines with pistons rotating or oscillating with relation to the housing with one or more pistons in the form of a disk or rotor rotating with relation to the housing; with annular working chamber
    • F02B2730/018—Internal-combustion engines with pistons rotating or oscillating with relation to the housing with one or more pistons in the form of a disk or rotor rotating with relation to the housing; with annular working chamber with piston rotating around an axis passing through the gravity centre, this piston or the housing rotating at the same time around an axis parallel to the first axis
    • 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

  • This invention relates to a timing device for rotary engines of the type comprising fxed combustion chambers housed in the stator.
  • inlet and exhaust valves are provided in these combustion chambers, they can be actuated either through a gear system operatively interconnecting with a proper gear ratio the engine shaft and a camshaft, or through a linkage system operatively interconnecting the rotor and the camshaft.
  • this invention is concerned with a direct timing system wherein the rotor comprises a cam of specific design co-acting with a roller and rocker device for actuating the valves.
  • the cam must be made with a special contour.
  • the low part of bottom portion of the cam is defined by the path of the center of the timing roller connected to and engaging the valve concerned; this path is of curvilinear configuration and describes a cycloid.
  • the same path becomes an epicycloid when the number of teeth of the rotor is lower than that of the stator, or an hypocycloid when the number of teeth of the rotor is greater than that of the stator.
  • the number of arcs constituting this cyclcid is equal to the number of teeth of the rotor and the roller envelope is a curve parallel to this cycloid.
  • the valve lift is obtained by adding a swell or raised portion to this cam contour.
  • the number of raised portions is half the tooth number in a four-stroke engine and the same in a two-stroke engine.
  • the angular location of the raised portion on the cycloidal contour varies as a function of the position of the roiler in relation to the combustion chamber of which it controls the valve.
  • FEGURE 1 shows in cross section a typical arrangement of an engine of this type
  • FIGURE 2 is an axial section of the engine taken along line 2-2 of FIG. 1;
  • PEGURE 3 is a fragmentary diagrammatic section showing an alternate embodiment
  • FEGURES 4 and 5 are diagrams illustrating the method of determining the cam contour.
  • the engine comprises a rotor 1 mounted on the eccentric portion 2 of shaft 3.
  • the rotor revolves within a stator 4 comprising chambers 5 in which valves such as 6 are mounted.
  • a cam 7 for actuating the valves is mounted on the rotor.
  • a rocker 8 fulcrumed on a pin 9 is actuated by a rod 10 having a roller ltla responsive to the contour of the cam 7, this contour being a cycloid and comprising swells 11 and troughs 12.
  • valve disposal is of conventional character in that the rod it) is compression stressed, the valve 6 being unseated each time a cam swell engages the roller carried by this rod.
  • E be the eccentricity of the rotor in relation to its shaft.
  • Circle G in FIG. 4 corresponds to shaft 3 in PEG. 1 and circle F of FIG. 4 corresponds to a portion of shaft 2 of FIG. 1.
  • angle a which is the general term representing the rotation angles of the crank 01 and the rotor with respect to the stator
  • the rotor revolves about itself through an angle a/ 4.
  • the center of circles F and C is considered stationary in FIG. 4, and the center of circles G and C is shown to move about circle F in FIG. 4. Therefore, circle C is considered to be rolling around rotor circle C in PEG. 4 but for the purpose of analysis.
  • A be the general center of a roller.
  • the general term A is represented by A A A A A A for the valve closing positions and A A A g, A' A A for the valve opening positions (see FIG. 4).
  • a of 10 corresponds a [3/5 of 0A.
  • the successive points of the path A A A will be obtained.
  • This path will be a four-arc epicycloid. Five points such as A can be placed at the vertices of a regular pentagon centered at 0; they will generate the same path.
  • the different positions of 0A are designated angularly by 0::(01, 0A), not by p:(lO 10) because ct is the angle of rotation of the crankshaft (crank arm 10) causing the point in question of the path to become coincident with the center of the roller.
  • the angle of origin azO corresponds to a crank arm 01 directed toward the center of the roller.
  • the positions of 0A are represented for the values of or equal 36, 72, 144 and OI means generally the line between points and I; (OI, 0A) means generally the angle between points IOA.
  • the curve giving the valve lift is constructed according to the following method:
  • a lifting law illustrated in Cartesian ordinates in FIG. will be given as a function of the crank arm angle or.
  • the curve is obtained by transferring from the core contour on the radius GA the lifts corresponding to the angles: A A' zL L' A A zL L AzA gzLgL z' and so forth.
  • a curve which is the locus of the roller centers is obtained.
  • the cam proper is obtained by taking the envelope of the circles centered on A which are representative of the rollers.
  • Rotary engine comprising a stator including a pair of end walls and a peripheral wall joining said end walls and defining a hollow Working space, a rotating shaft lying along the axis of said Working space, an eccentric secured to said shaft, a rotor in said working space rotatably journalled on said eccentric and mounted eccentrically on said shaft, said outer rotor surface being formed with a plurality of lobes of cycloidal configuration, said stator peripheral wall being formed with a plurality of chambers of a shape generally conforming to the shape of said rotor lobes, said stator having one more chamber than said rotor has lobes, valves in each of said chambers of said stator, and means to cause the lifting of said valves, said means comprising a cam rigidly secured to said rotor and consequently having an eccentric movement identical to the movement of the rotor, and members, one for each valve, provided with rollers which rest against the surface of the cam, each of said members being operatively connected to its valve so as to impart a lifting

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
US115809A 1960-07-06 1961-06-08 Timing devices for rotary engines Expired - Lifetime US3199495A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR832246A FR1269802A (fr) 1960-07-06 1960-07-06 Dispositif de distribution pour moteur rotatif

Publications (1)

Publication Number Publication Date
US3199495A true US3199495A (en) 1965-08-10

Family

ID=8735013

Family Applications (1)

Application Number Title Priority Date Filing Date
US115809A Expired - Lifetime US3199495A (en) 1960-07-06 1961-06-08 Timing devices for rotary engines

Country Status (5)

Country Link
US (1) US3199495A (fr)
DE (1) DE1299929B (fr)
ES (1) ES268662A1 (fr)
FR (1) FR1269802A (fr)
GB (1) GB990817A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220176669A1 (en) * 2019-03-08 2022-06-09 Bobst Lyon Unit for forming a plate element for manufacturing folding boxes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1799527A (en) * 1928-11-08 1931-04-07 Plato Gerhardt Rotary engine
FR838124A (fr) * 1937-05-22 1939-02-28 Moteur rotatif à explosions
FR850935A (fr) * 1938-09-06 1939-12-29 Perfectionnements aux machines à pistons rotatifs, et plus spécialement aux moteurs à explosion ou à combustion interne, ou pompes et compresseurs

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1188135A (fr) * 1957-12-06 1959-09-18 Perfectionnements aux machines rotatives comprimant ou détendant un fluide compressible

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1799527A (en) * 1928-11-08 1931-04-07 Plato Gerhardt Rotary engine
FR838124A (fr) * 1937-05-22 1939-02-28 Moteur rotatif à explosions
FR850935A (fr) * 1938-09-06 1939-12-29 Perfectionnements aux machines à pistons rotatifs, et plus spécialement aux moteurs à explosion ou à combustion interne, ou pompes et compresseurs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220176669A1 (en) * 2019-03-08 2022-06-09 Bobst Lyon Unit for forming a plate element for manufacturing folding boxes
US12325206B2 (en) * 2019-03-08 2025-06-10 Bobst Lyon Unit for forming a plate element for manufacturing folding boxes

Also Published As

Publication number Publication date
ES268662A1 (es) 1961-10-16
GB990817A (en) 1965-05-05
FR1269802A (fr) 1961-08-18
DE1299929B (de) 1969-07-24

Similar Documents

Publication Publication Date Title
US4955330A (en) Cam drive mechanism for internal combustion engine
US3584610A (en) Internal combustion engine
US4352344A (en) Valve operating mechanism for internal combustion engines
US4505235A (en) Valve timing mechanisms of internal combustion engines
US3144009A (en) Variable valve timing mechanism
JPH09144551A (ja) ４サイクルロータリーエンジン
JPS59188014A (ja) エンジンのバルブタイミング制御装置
US3985476A (en) Rotary internal combustion engine with valved inlet through piston
US11274552B2 (en) Engine crank and connecting rod mechanism
US3897760A (en) Valve timing overlap control for internal combustion engines
US1790198A (en) Internal-combustion engine
US3199495A (en) Timing devices for rotary engines
US4128084A (en) Rotary engine
US4073216A (en) Valve control apparatus for rotary engines
US2211292A (en) Split cycle internal combustion engine
US1648780A (en) Internal-combustion engine
US1299264A (en) Explosion-engine.
US3394683A (en) Opposed piston engine
US3112739A (en) Valve tappets of internal combustion engines
US3913533A (en) Rotary internal combustion engine
US3131678A (en) Valve gears for rotary-piston explosion engines
US3148667A (en) Rotary engines
US4583498A (en) Method of changing the direction of rotation of an internal combustion engine, and an engine applying the method
RU2097588C1 (ru) Роторно-поршневой многокулачковый четырехтактный двигатель-3
US1482629A (en) Rotary engine