US3801240A - Rotary engine of trochoidal design - Google Patents
Rotary engine of trochoidal design Download PDFInfo
- Publication number
- US3801240A US3801240A US00348715A US3801240DA US3801240A US 3801240 A US3801240 A US 3801240A US 00348715 A US00348715 A US 00348715A US 3801240D A US3801240D A US 3801240DA US 3801240 A US3801240 A US 3801240A
- Authority
- US
- United States
- Prior art keywords
- gear
- teeth
- rotor
- gears
- combination recited
- 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
Links
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000006872 improvement Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 241000405147 Hermes Species 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
-
- 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
- Y10T74/19642—Directly cooperating gears
- Y10T74/19647—Parallel axes or shafts
Definitions
- This invention relates to a rotary piston engine of trochoidal design as shown generally in U. S. Pat. Nos. 2,988,008 and 2,988,065, wherein a rotor is disposed within the engine cavity of a multilobed trochoidal peripheral housing, the rotor being rotatably mounted on an eccentric portion of a shaft transpiercing the side walls of the housing.
- the rotor bears on one side face a gear coaxial with the rotors axis of rotation on the eccentric, and in engagement with a smaller gear borne by a housing side wall.
- the smaller gear is coaxial with the shaft axis, and the shaft passes through the smaller gear.
- the phasing gears have been spur gears with radially extending teeth, the smaller gear being of pinion type with an annular web portion from which the teeth extend radially outwardly, and the large gear being a ring gear having an annular web with the teeth extending radially inwardly therefrom.
- Such gears are exemplified in U. S. Pat. Nos. 3,091,386 and 3,323,497.
- the annular web members of both gears have been used to provide attachment to their respective supporting means.
- the necessary radial width of the web member of the ring gear limits the amount of space available on the rotor side face for positioning the annular oil seals surrounding the gear, as shown in U. S. Pat. Nos. 3,171,590 and 3,400,939.
- the radial width of the web of the pinion gear limits the diameter of the shaft passing therethrough, this gear being required to be in suitable ratio to the ring gear. ln order to keep the shaft diameter as large as possible, use has been made of gear teeth having a relatively small module, usually about 1.5, the module being defined as the pitch diameter of the gear in millimeters divided by the number of teeth. A small module necessitates a relatively large number of relatively weak teeth.
- the restricted space on the rotor face results in structural limitations in the possible ratio of e:R of the engine, where e is the spacing between the parallel axes of rotation of the rotor and of the shaft, and R is the radius from the rotational axis of the rotor to a rotor apex.
- Still another object is to provide gears on parallel shafts having meshing end-face teeth.
- a further object is to provide a rotary engine having phasing gearing with a larger module than was possible in the prior art.
- FIG. 1 is an axial cross-section in elevation of a trochoidal rotary engine embodying the phasing gearing of the invention
- FIG. 2 is an exploded perspective view showing schematically the phasing gears of FIG. 1 in their relation to the rotor; and 5
- FIG. 3 is a fragmentary view of portions of the rotor and a side wall, showing a modified embodiment of the phasing gearing.
- FIG. 1 there is shown a rotary engine having a housing comprising a peripheral shell 1 with a twolobed trochoidal inner surface 2, and two side parts '3 and 4, defining an engine cavity.
- a rotatable shaft 5 extends through the side parts 3 and 4, being appropriately mounted in bearings borne by the side parts, and having an eccentric portion 6 disposed within the engine cavity.
- a generally triangular rotor 7 is rotatably mounted on the eccentric 6, the rotor bearing at its apexes seal members 8 which during rotation of the rotor continuously sweep the inner peripheral'surface 2 in sealing relation therewith.
- the axis 11 of rotation of the rotor on the eccentric portion is displaced from, but parallel to, the rotational axis 12 of the shaft.
- the shaft rotates at three times the speed of the rotation of the rotor within the housing.
- This speed ratio is maintained by synchronized phasing gearing comprising a ring gear 9 mounted on a side face of the rotor and in mesh with a pinion gear 10 borne by the adjacent side part of the housing.
- a ring gear 9 mounted on a side face of the rotor and in mesh with a pinion gear 10 borne by the adjacent side part of the housing.
- ring gear 9 has the same outer and inner diameters as the outer and inner'diameters of the teeth 13 extending therefrom, and gear base 16 of the pinion gear 10 has the same outer and inner diameters as the outer and inner diamters of its axially extending teeth, with the pitch diameters of the two gearsbeing tangent at the point of complete meshing.
- the teeth 13 and 14 of the two gears are attached at one end exclusively to the gear bases 15 and 16 respectively, the opposite ends of the teeth-being free-standing, as best shown in FIG. 2.
- the individual teeth are thus self supporting, and it is possible to produce or machine their form and engaging surfaces by a rotating end mill or a rotating pot-shaped grinding wheel.
- the tooth flanks may advantageously be designed on an involute approximating a circular are, for the purpose of making it possible to produce them by means of a rotating tool with the greatest possible accuracy.
- the teeth can of course be cut by any of the known gear-cutting means.
- the tooth form is shown only schematically in FIG. 2, it is to be understood that'the teeth may have any form which would be suitable for radial teeth of the prior art.
- the gears 9 and 10 are determined solely by the radial height of the teeth 13 and 14, this produces substantial advantages in comparisonwith the gears of the prior art, the radial extent of which was the sum of the tooth height plus the radial width of the flange or web.
- the gears of the invention can have a module two or three times that of the ordinary teeth, and thus teeth that are'two or three times stronger.
- the module of ordinary teeth 1.5 for example
- the radial extent of the gears is substantially reduced.
- this reducton in radial breadth is taken from the inner diameter, so that it is feasible to have a larger aperture therethrough for the passage of a shaft of greater diameter and higher strength.
- the reduction of radial breadth results in a smaller outer diameter, so that in engines having a great angle of traverse, that is, a small e.'R ratio, there remains sufficient room on the side face of the rotor for g 4 insure centering.
- each gear base 15' and 16 is provided with an annular extension 20 and 21 respectively, which in addition to the end connection of the teeth also connect what would be the roots of the teeth in ordinary spur type gears. That is, the axial extension 20 of the ring gear is a thin barrel disposed on the radially outward or root side of the teeth 13' and connected thereto, and the extension 21 of the pinion is a thin barrel disposed on the radially inward or root side of the teeth 14' and connected thereto.
- gears may be mounted in the manner previously described, they may also be advantageously mounted by heavy dowels 22 between the ring gear 9 and rotor 7, and by similar dowels 23 between the pinion l0 and the side wall 3, the dowels beingpressed into corresponding holes in the gears and their respective mounting members.
- Gears 9' and 10' are preferably fabricated by a sintering process.
- a rotary engine of trochoidal type having a housing comprising side walls and a peripheral wall defining an engine cavity, a shaft transpiercing the side walls and having an eccentric portion disposed within the cavity, a rotor rotatably mountedon the eccentric and bearing on one side face a gear in engagement with a gear borne by the adjacent side wall, the improvement comprising: each of the gears having a gear base portion with gear teeth extending axially therefrom.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Retarders (AREA)
- Hydraulic Motors (AREA)
- Gears, Cams (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2222568A DE2222568C3 (de) | 1972-05-09 | 1972-05-09 | Führungsgetriebe für eine Kreiskolbenmaschine in Trochoidenbauart |
Publications (1)
Publication Number | Publication Date |
---|---|
US3801240A true US3801240A (en) | 1974-04-02 |
Family
ID=5844406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00348715A Expired - Lifetime US3801240A (en) | 1972-05-09 | 1973-04-06 | Rotary engine of trochoidal design |
Country Status (9)
Country | Link |
---|---|
US (1) | US3801240A (ja) |
JP (1) | JPS5848722B2 (ja) |
CA (1) | CA996865A (ja) |
DE (1) | DE2222568C3 (ja) |
FR (1) | FR2184336A5 (ja) |
GB (1) | GB1376864A (ja) |
IL (1) | IL42053A (ja) |
IT (1) | IT984082B (ja) |
SE (1) | SE391964B (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4772189A (en) * | 1985-11-20 | 1988-09-20 | Norton Motors Limited | Rotor for a rotary engine |
US8985085B2 (en) | 2011-07-28 | 2015-03-24 | Pratt & Whitney Canada Corp. | Oil seal arrangement for rotary internal combustion engine |
US9366138B2 (en) | 2011-07-28 | 2016-06-14 | Pratt & Whitney Canada Corp. | Rotary internal combustion engine with phasing gear |
CN110529236A (zh) * | 2019-08-12 | 2019-12-03 | 张英华 | 一种旋转活塞发动机及控制方法 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5846714A (ja) * | 1981-09-14 | 1983-03-18 | Nissin Electric Co Ltd | クロツクパルス周波数変換回路 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
1972
- 1972-05-09 DE DE2222568A patent/DE2222568C3/de not_active Expired
-
1973
- 1973-04-06 US US00348715A patent/US3801240A/en not_active Expired - Lifetime
- 1973-04-10 CA CA168,349A patent/CA996865A/en not_active Expired
- 1973-04-13 SE SE7305231A patent/SE391964B/xx unknown
- 1973-04-16 IL IL42053A patent/IL42053A/en unknown
- 1973-04-20 IT IT23339/73A patent/IT984082B/it active
- 1973-05-08 JP JP48050379A patent/JPS5848722B2/ja not_active Expired
- 1973-05-08 FR FR7316582A patent/FR2184336A5/fr not_active Expired
- 1973-05-09 GB GB2202473A patent/GB1376864A/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4772189A (en) * | 1985-11-20 | 1988-09-20 | Norton Motors Limited | Rotor for a rotary engine |
US8985085B2 (en) | 2011-07-28 | 2015-03-24 | Pratt & Whitney Canada Corp. | Oil seal arrangement for rotary internal combustion engine |
US9366138B2 (en) | 2011-07-28 | 2016-06-14 | Pratt & Whitney Canada Corp. | Rotary internal combustion engine with phasing gear |
CN110529236A (zh) * | 2019-08-12 | 2019-12-03 | 张英华 | 一种旋转活塞发动机及控制方法 |
CN110529236B (zh) * | 2019-08-12 | 2022-02-08 | 张英华 | 一种旋转活塞发动机及控制方法 |
Also Published As
Publication number | Publication date |
---|---|
DE2222568C3 (de) | 1978-05-11 |
DE2222568B2 (de) | 1977-09-22 |
JPS4947708A (ja) | 1974-05-09 |
FR2184336A5 (ja) | 1973-12-21 |
GB1376864A (en) | 1974-12-11 |
JPS5848722B2 (ja) | 1983-10-31 |
IT984082B (it) | 1974-11-20 |
DE2222568A1 (de) | 1973-11-22 |
CA996865A (en) | 1976-09-14 |
SE391964B (sv) | 1977-03-07 |
IL42053A0 (en) | 1973-06-29 |
IL42053A (en) | 1976-03-31 |
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