US3796524A - Rotor and rotor gear assembly for a rotary internal combustion engine - Google Patents

Rotor and rotor gear assembly for a rotary internal combustion engine Download PDF

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Publication number
US3796524A
US3796524A US00268168A US3796524DA US3796524A US 3796524 A US3796524 A US 3796524A US 00268168 A US00268168 A US 00268168A US 3796524D A US3796524D A US 3796524DA US 3796524 A US3796524 A US 3796524A
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US
United States
Prior art keywords
rotor
center
rotor gear
cylindrical
gear
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
US00268168A
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English (en)
Inventor
Y Ishikawa
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.)
Nissan Motor Co Ltd
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Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Application granted granted Critical
Publication of US3796524A publication Critical patent/US3796524A/en
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    • 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
    • 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
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19633—Yieldability in gear trains
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19851—Gear and rotary bodies

Definitions

  • ABSTRACT A rotor and rotor gear assembly for use in a rotary internal combustion engine of the trochoidal type adapted to absorb deflections of a rotor and a rotor gear due to their different thermal expansions for thereby preventing a connecting pin from being subjected to excessive mechanical stresses.
  • the rotor and rotor gear assembly includes at least three cylindrical bushings which are tightly but rotatably inserted into bore means formed in the rotor gear.
  • Each of the cylindrical bushings is provided with an axially extending eccentric hole into which the connecting pin is disposed to connect the rotor gear to the rotor.
  • the cylindrical bushings are located in the associated bore means formed in the rotor gear in such a manner that the center of each eccentric hole of the cylindrical bushings is angularly displaced with respect to the center line which connects the center of the rotor and the center of the bushing so as to cause the connecting pin to rotate the associated cylindricalbushing when the rotor and rotor gear are subjected to different thermal expansions respectively.
  • This invention relates to a rotary internal combustion engine of the trochoidal type and, more particularly, to a rotor and rotor gear assembly for use in the rotary internal combustion engine of the type above described.
  • the rotary internal combustion engine of the trochoidal type to which the present invention is directed has a rotor which is slidably received within a trochoidal chamber formed in a housing, and a rotor gear which is rotatable with the rotor.
  • the rotor and rotor gear are usually separately formed from each other and both members are usually connected to each other by suitable fastener means such as bolts.
  • the rotor has three apex portions with convexly arcuate working faces extending between adjacent apex portions. A troughlike cutout or recess is provided in each working face and serves as a combustion chamber.
  • the rotor is rotatably disposed in the trochoidal chamber of the housing and repeatedly exposed to a high temperature of the burning gases so that the thermal expansion of the rotor becomes greater than that of the rotor gear which is usually formed by forgoing.
  • a problem is encountered in the prior art rotor and rotor gear assembly in that the connecting portion between the rotor and rotor gear is subjected to unusual mechanical stresses due to the difference in thermal expansion therebetween and accordingly frequent replacement is required. This problem becomes more serious especially where the rotor is made of a lightweight aluminum alloy for increasing the output speed of the rotary internal combustion engine.
  • the present invention contemplates to eliminate the above-mentioned shortcomings encountered in the prior art rotor and rotor gear assembly and provided an improved rotor and rotor gear assembly for use in a rotary internal combustion engine, which rotor and rotor gear assembly has a connecting. portion adapted to absorb deflections of the rotor and rotor gear due to their different thermal expansions for thereby preventing the rotor and rotor gear from being subjected to unusual mechanical stresses.
  • the rotor gear is provided with at least three bore means at circumferentially equally divided positions in which bushings are tightly but rotatably inserted.
  • Each of the bushings has an axially extending hole, the center of which is slightly displaced from the center of the bushing per se.
  • These bushings are disposed in the bore means of the rotor gear in such a manner that the centers of respective holes lay on the circular path the radius of which is slightly smaller than that of the circular path on which the centers of the bushings lay.
  • the rotor is provided with at least three pins at circumferentially equally divided positions, which are inserted into the holes of the bushings, re-
  • FIG. 1 is a plan view of a preferred embodiment of the rotor and rotor gear assembly according to the present invention.
  • FIG. 2 is a sectional view of the rotor and rotor gear assembly shown in FIG. 1; and 7
  • FIG. 3 is a schematic view illustrating the function of the rotor and rotor gear assembly implementing the present invention.
  • the rotor and rotor gear assembly includes a rotor 12 and a rotor gear 14 which is mounted thereon.
  • the rotor 12 is shown as having three apex portions 16, 18 and 20 with convexly arcuate working faces 22, 24 and 26 extending between adjacent apex portions.
  • a trough-like cutout or recess 28 is provided in each arcuate working face.
  • the rotor l2 has an axial bore 30 in which a drive shaft (not shown) provided with a smaller diameter gear than the rotor gear and meshing with the rotor gear is disposed so that the rotor 12 is eccentrically rotatable in the trochoidal chamber of the housing (not shown).
  • This rotor 12 is also provided with an annular recess 32 on one side thereof for a reason to be described in detail.
  • the rotor gear 14 which is herein shown as being internally toothed, is provided with a plurality of bore means 34, into which cylindrical bushings are rotatably disposed. Each of these cylindrical bushings 36 is provided with an axial hole 38, the center of which is displaced from that of the cylindrical bushing per se in such a manner as will be clearly described hereinafter.
  • This rotor gear 14 is placed in the annular recess 32 formed in the rotor 12 and is secured thereto by connecting pins 40. More specifically, the connecting pins 40 are inserted into the axially extending eccentric holes 38 of the cylindrical bushings 36 and screwed into the rotor 12.
  • a very important feature of the: present invention is that the cylindrical bushings 36 are tightly but rotatably inserted into the bore means 34 formed in the rotor gear 14 in such a manner that the center of each axially extending eccentric hole of the cylindrical bushings 36 lies on a common circular path the radius of which is slightly smaller than that of the circular path on which the center of the cylindrical bushing 36 lay.
  • connecting pin 40 rotates about the center point P of the cylindrical bushing 36 to assume a position shown in left-hand portion of FIG. 3 where the center Q of the connecting pin 40 lies on a circular path the radius of which is represented by R when the rotor is thermally expanded.
  • R the radius of which is represented by R when the rotor is thermally expanded.
  • the right side portion illustrates the relative positions of one of the bushings 36 and its corresponding connecting pin 40 when the rotor (not shown in FIG. 3) is cold.
  • the center point P of the bushing 36 lies on a circle having a radius R OP where O is the center point of the rotor and the rotor gear whilst the center point Q of the connecting pin 40 lies on a circle having a radius R Q.
  • the relative sizes of the bushing 36 and the connecting pin 40 are selected in such a manner that the points R0 and Q form a small angle POQ so that when the rotor is subjected to thermal expansion the connecting pin turns the bushing to the position shown in the left side portion of FIG. 3.
  • the center point of the connecting pin lies on a circle having a radius R; OQ the points P, O and 0 still forming a relatively small angle POQ.
  • the rotation of the bushing 36 by the connecting pin accommodates the thermal expansion of the rotor without causing undue stresses on the connecting pin 40.
  • a rotor and rotor gear assembly for use in a rotary internal combustion engine of the trochoidal type, comprising, in combination, a rotor having an annular recess formed on one side thereof, a rotor gear having at least three bore means, cylindrical bushings tightly but rotatably inserted into said bore means of said rotor gear, said cylindrical bushings having axially extending eccentric holes respectively, and.connecting pins disposed in said axially extending eccentric holes and connected to said rotor for mounting said rotor gear thereon, the center of each axially extending eccentric hole of said cylindrical bushings being angularly displaced with respect to the center line which connects the center of said rotor and the center of each cylindrical bushing, whereby, when said rotor is subjected to thermal expansion, said connecting pins rotate said cylindrical bushings about the centers of said cylindrical bushing respectively to absorb deflections of said rotor and rotor gear due to their different thermal expansions for thereby preventing said connecting pin

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Hydraulic Motors (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Retarders (AREA)
US00268168A 1971-07-16 1972-06-30 Rotor and rotor gear assembly for a rotary internal combustion engine Expired - Lifetime US3796524A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46052867A JPS5128765B1 (enrdf_load_stackoverflow) 1971-07-16 1971-07-16

Publications (1)

Publication Number Publication Date
US3796524A true US3796524A (en) 1974-03-12

Family

ID=12926805

Family Applications (1)

Application Number Title Priority Date Filing Date
US00268168A Expired - Lifetime US3796524A (en) 1971-07-16 1972-06-30 Rotor and rotor gear assembly for a rotary internal combustion engine

Country Status (5)

Country Link
US (1) US3796524A (enrdf_load_stackoverflow)
JP (1) JPS5128765B1 (enrdf_load_stackoverflow)
FR (1) FR2146754A5 (enrdf_load_stackoverflow)
GB (1) GB1369937A (enrdf_load_stackoverflow)
IT (1) IT961419B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100283343A1 (en) * 2009-05-06 2010-11-11 Brust Eric A Rotor gear for a generator
US20130139514A1 (en) * 2007-05-31 2013-06-06 Bruce Edward Varney Combustor liner support and seal assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53155655U (enrdf_load_stackoverflow) * 1977-05-13 1978-12-07
JPS5489771A (en) * 1977-12-27 1979-07-17 Toshiyuki Chichii Fuel meter
JPS54102043U (enrdf_load_stackoverflow) * 1977-12-27 1979-07-18
JPS54125666U (enrdf_load_stackoverflow) * 1978-02-23 1979-09-01

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702995A (en) * 1953-12-31 1955-03-01 Goodman Mfg Co Shock absorbing gearing
US3295754A (en) * 1962-04-02 1967-01-03 Kloeckner Humboldt Deutz Ag Rotary piston machine, particularly rotary piston internal combustion engine
US3297240A (en) * 1965-04-19 1967-01-10 Toyo Kogyo Company Ltd Rotary piston mounting mechanism
US3383936A (en) * 1967-02-13 1968-05-21 Curtiss Wright Corp Light-weight rotor and gear assembly for rotary mechanisms
US3400604A (en) * 1966-11-25 1968-09-10 Curtiss Wright Corp Rotor and gear assembly for rotary mechanisms
US3655302A (en) * 1970-04-02 1972-04-11 Curtiss Wright Corp Rotor and gear assembly for rotary mechanisms

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702995A (en) * 1953-12-31 1955-03-01 Goodman Mfg Co Shock absorbing gearing
US3295754A (en) * 1962-04-02 1967-01-03 Kloeckner Humboldt Deutz Ag Rotary piston machine, particularly rotary piston internal combustion engine
US3297240A (en) * 1965-04-19 1967-01-10 Toyo Kogyo Company Ltd Rotary piston mounting mechanism
US3400604A (en) * 1966-11-25 1968-09-10 Curtiss Wright Corp Rotor and gear assembly for rotary mechanisms
US3383936A (en) * 1967-02-13 1968-05-21 Curtiss Wright Corp Light-weight rotor and gear assembly for rotary mechanisms
US3655302A (en) * 1970-04-02 1972-04-11 Curtiss Wright Corp Rotor and gear assembly for rotary mechanisms

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130139514A1 (en) * 2007-05-31 2013-06-06 Bruce Edward Varney Combustor liner support and seal assembly
US20100283343A1 (en) * 2009-05-06 2010-11-11 Brust Eric A Rotor gear for a generator
US8051738B2 (en) * 2009-05-06 2011-11-08 Hamilton Sundstrand Corporation Rotor gear for a generator

Also Published As

Publication number Publication date
IT961419B (it) 1973-12-10
GB1369937A (en) 1974-10-09
DE2234281B2 (de) 1975-12-18
FR2146754A5 (enrdf_load_stackoverflow) 1973-03-02
JPS5128765B1 (enrdf_load_stackoverflow) 1976-08-21
DE2234281A1 (de) 1973-02-08

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