US3904328A - Rotor for rotary combustion engine - Google Patents
Rotor for rotary combustion engine Download PDFInfo
- Publication number
- US3904328A US3904328A US470268A US47026874A US3904328A US 3904328 A US3904328 A US 3904328A US 470268 A US470268 A US 470268A US 47026874 A US47026874 A US 47026874A US 3904328 A US3904328 A US 3904328A
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- United States
- Prior art keywords
- hub
- rotor
- gear
- bushing
- ring gear
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- Expired - Lifetime
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- 238000002485 combustion reaction Methods 0.000 title abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000003292 diminished effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 238000003466 welding Methods 0.000 description 6
- 238000005219 brazing Methods 0.000 description 5
- 238000005476 soldering Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/08—Rotary pistons
-
- 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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C1/00—Rotary-piston machines or engines
- F01C1/22—Rotary-piston machines or engines of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth- equivalents than the outer member
-
- 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
Definitions
- ABSTRACT A partially fabricated ring gear of limited radial width is metallurgically attached to one side of the hub of a rotor for a rotary combustion engine, coaxial with the bore through the hub, and the gear teeth are then finish-machined to produce precise phasing of the rotor.
- a bearing bushing is then positioned in the hub bore from the opposite side of the rotor. Protrusions of the gear and the bushing on opposite sides of the rotor provide running surfaces for the axial guidance of the rotor. Rotor weight is diminished and interior accessibility improved.
- This invention relates to rotors for rotary internal combustion engines of the trochoidal type, and to methods of fabricating such rotors.
- Such an engine has a generally trochoidal peripheral housing and a pair of parallel end walls, a shaft transpiercing the end walls and having an eccentric portion disposed therebetween, and a multiapexed rotor of generally polygonal profile rotatably disposed on the eccentric.
- the rotor is hollow for internal cooling, with a peripheral wall and a pair of side walls defining its internal cavity, and has an internal hub for mounting it on the eccentric portion of the shaft; the side walls of the rotor are each provided with a circular opening.
- the rotor has disposed at one side a ring gear which meshes with a pinion gear secured to one of the end walls of the engine, and the attachment of such a ring gear has caused certain difficulties in the prior art.
- it has been secured by screws to the rotor hub.
- This type of attachment requires a considerable radial width of the ring gear and also of the hub, so that the holes may be capable of taking the attaching screws.
- This large radial width of the hub adds to the rotor weight and leaves only a relatively narrow gap between the end of the rotor hub and the adjacent rotor side walls.
- the casting cores necessary for production of the rotor cavities must be fastened in position through this small gap, which is a time-consuming operation, and moreover the cores in this region have a very weak cross-section and break easily, increasing the cost of fabrication.
- a ring gear of considerable radial width screwed to the rotor hub as in the prior art, reduces the passage to the interior of the rotor and restricts the flow of the internal cooling fluid through the annular gap remaining between the ring gear and the adjacent side wall of the rotor.
- This invention provides a rotor and a process for making it, wherein the radial width of both the rotor hub and the ring gear are relatively small, making possible the use of more stable casting cores and providing greater accessibility to the interior rotor cavity.
- This is accomplished by providing a rotor having a hub of small radial width, the hub having a bore therethrough of a diameter equal to or greater than the diameter of the root circle of the ring gear, and metallurgically attaching a ring gear of small radial width to one end of the hub.
- the ring gear may be only partially fabricated before attachment, that is, it may have no teeth or only roughly machined teeth. and attachment may be by any of various welding processes, brazing, or by soldering.
- the gear teeth are finish machined by a broaching tool or other throughpassing tool, which can readily run into the hub bore since the bore is at least as large as the root circle of the gear.
- a bearing bushing is installed in the hub bore, which bushing may project slightly in the axial direction beyond the rotor side face to provide a running surface.
- the gear on the opposite side may also project beyond the rotor side face to provide a running surface on that side.
- Still another object is to provide a method of fabricating such a rotor.
- FIG. 1 is an elevation of the rotor of the invention, looking in the axial direction;
- FIG. 2 is a cross-section on an enlarged scale, taken on line 2-2 of FIG. I;
- FIG. 3 is a fragmentary view of the area circled in FIG. 2, showing a modified embodiment.
- FIG. 1 shows a view of the gear side of a generally polygonal rotor according to the invention.
- the profile of the rotor is shown as generally triangular with three apex portions, it will be understood that it may have other configurations, depending on the number of lobes of the trochoidal housing of the engine in which it is to be used.
- the rotor has two parallel side walls 1 and 2 and a peripheral wall 3.
- a hub portion 4 of less axial extent than the internal space between the side walls is positioned midway therebetween, connected to the peripheral wall by ribs or apertured webs 5, the radial thickness of the hub being of minimal extent.
- At least one end face 6 of the hub is machined for attachment of the gear.
- the other end face of the hub may be machined or left as cast.
- a ring gear 7 is metallurgically attached to the end face 6.
- Such metallurgical attachment can be by means of any of various welding processes such as friction welding, electron beam welding, or laser beam welding; or the attachment can be by means of brazing or soldering.
- the rotor body may be formed of cast iron, it is preferably of lightweight metal, such as aluminum, aluminum alloy, or other alloys of lower weight than iron.
- the gear is preferably formed of steel.
- the gearing in trochoidal engines of the present type does not transmit torque, but serves only for phasing to maintain the rotor in proper registry with the housing within which it turns. Since the load on the ring gear is light, great strength is not required.
- the radial thickness of the solid web of the gear outside the root circle of the teeth may be as little as the tooth depth, since the gear is considerably stiffened and supported by attachment to the hub. In the example shown the web thickness is about one and one-half times the tooth depth.
- the radial thickness of the hub at the plane of attachment need not be greater than that of the gear web.
- brazing or soldering is to be used for attachment, it is advantageous to dispose a foil or a paste of the brazing or soldering material between the gear and the hub, and fuse it in a furnace.
- the contacting surfaces of the gear and the hub may be made conical, as shown in FIG. 3.
- the gear may have fully formed teeth at the time of attachment. However, in such a case an exact phase setting of the teeth can be obtained only with complicated and expensive auxiliary equipment.
- a gear blank without teeth may be attached, and the teeth wholly fabricated after attachment.
- the preferable method is to attach a gear with partially formed or roughly machined teeth, and to do the finishmachining after attachment. For this reason the inner diameter 8 of the bore through the hub is at least equal to, and preferably greater than, the root circle diameter of the gear teeth 9 of the ring gear 7. Because of this difference in diameters, after attachment of the gear the teeth can be finish-machined by a broaching tool or other through-passing tool without interference with the hub.
- a bearing bushing 10 is installed in the hub bore; the bushing may be pressed or shrunk into the bore, or affixed with a suitable adhesive.
- the gear 7 may project axially slightly beyond the face 11 of the adjacent side wall 1, and serve as a running surface for the axial guidance of the rotor against the adjacent end wall (not shown) of the housing.
- a corresponding guidance at the opposite side of the rotor may be obtained in that the bearing bushing 10 extends axially beyond the face 12 of the side wall 2 of the rotor.
- annular grooves 13 and 14 In the inner surface of the bushing 10 are disposed two annular grooves 13 and 14, the grooves being positioned in regions approximately coplanar with the respective axial ends of the hub, preferably just within the hub.
- the grooves 13 and 14 delimit therebetween the bearing surface proper, and receive the lubricating oil supplied through passages in the shaft (not shown) to the bearing, after it emerges from the ends of the bearing surface. Oil dwelling in the annular grooves 13 and 14 prevents entry of air into the bearing gap occasioned by necessary clearance.
- Groove 13 communicates with radial apertures 15 through bushing 10, which in turn communicate with further channels 16 which may be disposed in either the hub 4 or in the gear 7. The oil from groove 13 is thereby conducted to the interconnected hollow spaces 17 in the rotor.
- Channels 16 may be readily provided by cutting slots in the end face 6 of the hub prior to attachment of the gear, or they may be similar slots cut in the abutting face of the gear prior to attachment.
- the annular groove 14 makes it possible for the opposite end of the bushing 10, extending axially beyond the hub, to expand freely in the radial direction without producing deformation of the actual bearing surface between the grooves 13 and 14.
- inner surface of the bore 8 through the hub may be coated with a layer of material having bearing properties, such as lead or a lead-containing alloy.
- Openings 18 and 20 have a diameter at least greater than the diameter of the bore, and preferably should be as large as possible in order to reduce rotor weight and to provide the necessary accessibility to the interior.
- openings 18 and 20 are as large in diameter as can be produced within the rotor periphery, and have positioned in them oil seals 19 and 21, shown schematically, which prevent the leakage of oil into the operating chambers of the engine.
- rotors for trochoidal engines may be made with hubs and ring gears of minimum radial extent, reducing the weight of the rotor assembly and providing greater interior accessibility. It is further possible to make the rotor of light weight metal, such as aluminum or an aluminum alloy, and the gear of steel or other metal suitable for load-bearing and capable of withstanding wear.
- a hollow rotor for rotary engine of trochoidal type the rotor being formed of lightweight metal and comprising a pair of parallel side walls, a peripheral wall spacing the side walls apart and integral therewith, an internal hub integrally attached to the peripheral wall and having a bore therethrough, the hub having an axial length less than the spacing between the inner surfaces of the side walls, each side wall having a circular opening therethrough providing access to the interior of the rotor, the side wall openings being of greater diameter than the outer diameter of the hub and coaxial therewith, and an intemally toothed ring gear formed of steel metallurgically attached to one axial end face of the hub and coaxial therewith, the teeth of the ring gear having a root circle diameter less than the inner diameter of the hub bore, the outer diameter of the ring gear being no greater than the outer diameter of the hub end face to allow access to the interior of the rotor, the ring gear extending axially beyond the outer face of the adjacent side wall.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Rotary Pumps (AREA)
Abstract
A partially fabricated ring gear of limited radial width is metallurgically attached to one side of the hub of a rotor for a rotary combustion engine, coaxial with the bore through the hub, and the gear teeth are then finish-machined to produce precise phasing of the rotor. A bearing bushing is then positioned in the hub bore from the opposite side of the rotor. Protrusions of the gear and the bushing on opposite sides of the rotor provide running surfaces for the axial guidance of the rotor. Rotor weight is diminished and interior accessibility improved.
Description
United States Patent [191 Wilmers ROTOR FOR ROTARY COMBUSTION ENGINE [75] Inventor: Gottlieb Wilmers,Neckarsulm,
Germany [73] Assignees: Audi NSU Auto Union Aktiengesellschaft, Neckarsulm; Wankel G.m.b.H., Lindau. both of Germany [22] Filed: May 15, 1974 [21] Appl. No.: 470,268
Related US. Application Data [62] Division of Scr. No, 302,048, Oct. 30, 1972, Pat No.
[30] Foreign Application Priority Data Nov 16, 1971 Germany 2156814 [52] US. Cl 418/61 A [51] Int. CL" F02B 53/00 [58] Field of Search 418/61 A; 29/156 R [56] References Cited UNITED STATES PATENTS 3,059,585 11/1962 Froede ct al 418/61 A [4 1 Sept. 9, 1975 3,125,996 3/1964 Hoschele .1 123/845 3,289,647 12/1966 Turner et a1. 418/61 A 3,333,763 8/1967 Jungbluth et al. 418/61 A 3,369,740 2/1968 Abermeth 418/61 A 3,440,929 4/1969 Weissflog ct a 418/61 A 3,46l,848 8/1969 Bensinger 418/61 A 3,469,505 9/1969 Bensinger 418/61 A 3,829,944 8/1974 Wilmers 418/61 A Primary ExaminerC. J. Husar Attorney, Agenl, or Firm-Raymond P. Wallace; Victor D. Behn [5 7] ABSTRACT A partially fabricated ring gear of limited radial width is metallurgically attached to one side of the hub of a rotor for a rotary combustion engine, coaxial with the bore through the hub, and the gear teeth are then finish-machined to produce precise phasing of the rotor. A bearing bushing is then positioned in the hub bore from the opposite side of the rotor. Protrusions of the gear and the bushing on opposite sides of the rotor provide running surfaces for the axial guidance of the rotor. Rotor weight is diminished and interior accessibility improved.
2 Claims, 3 Drawing Figures ROTOR FOR ROTARY COMBUSTION ENGINE This is a division of application Ser. No. 302,048, filed Oct. 30, 1972, now US. Pat. No. 3,829,944.
BACKGROUND OF THE INVENTION This invention relates to rotors for rotary internal combustion engines of the trochoidal type, and to methods of fabricating such rotors.
Such an engine has a generally trochoidal peripheral housing and a pair of parallel end walls, a shaft transpiercing the end walls and having an eccentric portion disposed therebetween, and a multiapexed rotor of generally polygonal profile rotatably disposed on the eccentric. The rotor is hollow for internal cooling, with a peripheral wall and a pair of side walls defining its internal cavity, and has an internal hub for mounting it on the eccentric portion of the shaft; the side walls of the rotor are each provided with a circular opening.
The rotor has disposed at one side a ring gear which meshes with a pinion gear secured to one of the end walls of the engine, and the attachment of such a ring gear has caused certain difficulties in the prior art. In general it has been secured by screws to the rotor hub. This type of attachment requires a considerable radial width of the ring gear and also of the hub, so that the holes may be capable of taking the attaching screws. This large radial width of the hub adds to the rotor weight and leaves only a relatively narrow gap between the end of the rotor hub and the adjacent rotor side walls. The casting cores necessary for production of the rotor cavities must be fastened in position through this small gap, which is a time-consuming operation, and moreover the cores in this region have a very weak cross-section and break easily, increasing the cost of fabrication.
A ring gear of considerable radial width, screwed to the rotor hub as in the prior art, reduces the passage to the interior of the rotor and restricts the flow of the internal cooling fluid through the annular gap remaining between the ring gear and the adjacent side wall of the rotor.
These prior art problems of expensive casting procedures, high rotor weight, and low accessibility of the rotor interior are solved by the present invention.
SUMMARY This invention provides a rotor and a process for making it, wherein the radial width of both the rotor hub and the ring gear are relatively small, making possible the use of more stable casting cores and providing greater accessibility to the interior rotor cavity. This is accomplished by providing a rotor having a hub of small radial width, the hub having a bore therethrough of a diameter equal to or greater than the diameter of the root circle of the ring gear, and metallurgically attaching a ring gear of small radial width to one end of the hub. The ring gear may be only partially fabricated before attachment, that is, it may have no teeth or only roughly machined teeth. and attachment may be by any of various welding processes, brazing, or by soldering. After such metallurgical attachment the gear teeth are finish machined by a broaching tool or other throughpassing tool, which can readily run into the hub bore since the bore is at least as large as the root circle of the gear. After finishing the gear a bearing bushing is installed in the hub bore, which bushing may project slightly in the axial direction beyond the rotor side face to provide a running surface. The gear on the opposite side may also project beyond the rotor side face to provide a running surface on that side.
It is therefore an object of this invention to provide a lightweight rotor for a trochoidal engine.
It is another object to provide such a rotor having a hub of small radial extent to allow greater interior accessibility.
It is a further object to provide such a rotor with a metallurgically attached gear of small radial thickness.
Still another object is to provide a method of fabricating such a rotor.
Other objects and advantages will become apparent on reading the following specification in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevation of the rotor of the invention, looking in the axial direction;
FIG. 2 is a cross-section on an enlarged scale, taken on line 2-2 of FIG. I; and
FIG. 3 is a fragmentary view of the area circled in FIG. 2, showing a modified embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a view of the gear side of a generally polygonal rotor according to the invention. Although the profile of the rotor is shown as generally triangular with three apex portions, it will be understood that it may have other configurations, depending on the number of lobes of the trochoidal housing of the engine in which it is to be used.
As shown in FIG. 2, the rotor has two parallel side walls 1 and 2 and a peripheral wall 3. A hub portion 4 of less axial extent than the internal space between the side walls is positioned midway therebetween, connected to the peripheral wall by ribs or apertured webs 5, the radial thickness of the hub being of minimal extent. At least one end face 6 of the hub is machined for attachment of the gear. The other end face of the hub may be machined or left as cast. A ring gear 7 is metallurgically attached to the end face 6. Such metallurgical attachment can be by means of any of various welding processes such as friction welding, electron beam welding, or laser beam welding; or the attachment can be by means of brazing or soldering. Although the rotor body may be formed of cast iron, it is preferably of lightweight metal, such as aluminum, aluminum alloy, or other alloys of lower weight than iron. The gear is preferably formed of steel.
For such means of attachment only a small radial width of the gear is necessary. The gearing in trochoidal engines of the present type does not transmit torque, but serves only for phasing to maintain the rotor in proper registry with the housing within which it turns. Since the load on the ring gear is light, great strength is not required. Hence, the radial thickness of the solid web of the gear outside the root circle of the teeth may be as little as the tooth depth, since the gear is considerably stiffened and supported by attachment to the hub. In the example shown the web thickness is about one and one-half times the tooth depth. The radial thickness of the hub at the plane of attachment need not be greater than that of the gear web.
If brazing or soldering is to be used for attachment, it is advantageous to dispose a foil or a paste of the brazing or soldering material between the gear and the hub, and fuse it in a furnace. [f it is desired to increase the welding, brazing, or soldering area, the contacting surfaces of the gear and the hub may be made conical, as shown in FIG. 3.
The gear may have fully formed teeth at the time of attachment. However, in such a case an exact phase setting of the teeth can be obtained only with complicated and expensive auxiliary equipment. Alternatively, a gear blank without teeth may be attached, and the teeth wholly fabricated after attachment. The preferable method is to attach a gear with partially formed or roughly machined teeth, and to do the finishmachining after attachment. For this reason the inner diameter 8 of the bore through the hub is at least equal to, and preferably greater than, the root circle diameter of the gear teeth 9 of the ring gear 7. Because of this difference in diameters, after attachment of the gear the teeth can be finish-machined by a broaching tool or other through-passing tool without interference with the hub.
After the teeth are machined a bearing bushing 10 is installed in the hub bore; the bushing may be pressed or shrunk into the bore, or affixed with a suitable adhesive. As is shown in FIG. 2, the gear 7 may project axially slightly beyond the face 11 of the adjacent side wall 1, and serve as a running surface for the axial guidance of the rotor against the adjacent end wall (not shown) of the housing. A corresponding guidance at the opposite side of the rotor may be obtained in that the bearing bushing 10 extends axially beyond the face 12 of the side wall 2 of the rotor.
In the inner surface of the bushing 10 are disposed two annular grooves 13 and 14, the grooves being positioned in regions approximately coplanar with the respective axial ends of the hub, preferably just within the hub. The grooves 13 and 14 delimit therebetween the bearing surface proper, and receive the lubricating oil supplied through passages in the shaft (not shown) to the bearing, after it emerges from the ends of the bearing surface. Oil dwelling in the annular grooves 13 and 14 prevents entry of air into the bearing gap occasioned by necessary clearance.
The annular groove 14 makes it possible for the opposite end of the bushing 10, extending axially beyond the hub, to expand freely in the radial direction without producing deformation of the actual bearing surface between the grooves 13 and 14.
If desired, instead of installing a bearing bushing, the
inner surface of the bore 8 through the hub may be coated with a layer of material having bearing properties, such as lead or a lead-containing alloy.
By the foregoing method rotors for trochoidal engines may be made with hubs and ring gears of minimum radial extent, reducing the weight of the rotor assembly and providing greater interior accessibility. it is further possible to make the rotor of light weight metal, such as aluminum or an aluminum alloy, and the gear of steel or other metal suitable for load-bearing and capable of withstanding wear.
What is claimed is:
l. A hollow rotor for rotary engine of trochoidal type, the rotor being formed of lightweight metal and comprising a pair of parallel side walls, a peripheral wall spacing the side walls apart and integral therewith, an internal hub integrally attached to the peripheral wall and having a bore therethrough, the hub having an axial length less than the spacing between the inner surfaces of the side walls, each side wall having a circular opening therethrough providing access to the interior of the rotor, the side wall openings being of greater diameter than the outer diameter of the hub and coaxial therewith, and an intemally toothed ring gear formed of steel metallurgically attached to one axial end face of the hub and coaxial therewith, the teeth of the ring gear having a root circle diameter less than the inner diameter of the hub bore, the outer diameter of the ring gear being no greater than the outer diameter of the hub end face to allow access to the interior of the rotor, the ring gear extending axially beyond the outer face of the adjacent side wall.
2. A hollow rotor as recited in claim 1, wherein the hub bore has disposed therein a bearing bushing of greater axial length than the axial length of the hub and projecting beyond the hub at each end, the inner surface of the bushing having therein a pair of annular oilcollecting grooves each disposed approximately in the plane of the associated end face of the hub, the pair of oil-collecting grooves defining a bearing surface therebetween, the end of the bushing opposite the gear and axially outside of the bearing surface extending axially beyond the outer face of the associated side wall of the rotor, this extending end of the bushing being free to expand radially without deforming the bearing surface between the grooves.
Claims (2)
1. A hollow rotor for rotary engine of trochoidal type, the rotor being formed of lightweight metal and comprising a pair of parallel side walls, a peripheral wall spacing the side walls apart and integral therewith, an internal hub integrally attached to the peripheral wall and having a bore therethrough, the hub having an axial length less than the spacing between the inner surfaces of the side walls, each side wall having a circular opening therethrough providing access to the interior of the rotor, the side wall openings being of greater diameter than the outer diameter of the hub and coaxial therewith, and an internally toothed ring gear formed of steel metallurgically attached to one axial end face of the hub and coaxial therewith, the teeth of the ring gear having a root circle diameter less than the inner diameter of the hub bore, the outer diameter of the ring gear being no greater than the outer diameter of the hub end face to allow access to the interior of the rotor, the ring gear extending axially beyond the outer face of the adjacent side wall.
2. A hollow rotor as recited in claim 1, wherein the hub bore has disposed therein a bearing bushing of greater axial length than the axial length of the hub and projecting beyond the hub at each end, the inner surface of the bushing having therein a pair of annular oil-collecting grooves each disposed approximately in the plane of the associated end face of the hub, the pair of oil-collecting grooves defining a bearing surface therebetween, the end of the bushing opposite the gear and axially outside of the bearing surface extending axially beyond the outer face of the associated side wall of the rotor, this extending end of the bushing being free to expand radially without deforming the bearing surface between the grooves.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US470268A US3904328A (en) | 1971-11-16 | 1974-05-15 | Rotor for rotary combustion engine |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2156814A DE2156814A1 (en) | 1971-11-16 | 1971-11-16 | METHOD OF MANUFACTURING A HOLLOW PISTON FOR ROTARY PISTON MACHINES IN TROCHOID DESIGN |
US00302048A US3829944A (en) | 1971-11-16 | 1972-10-30 | Rotor for rotary combustion engine and method of making the same |
US470268A US3904328A (en) | 1971-11-16 | 1974-05-15 | Rotor for rotary combustion engine |
Publications (1)
Publication Number | Publication Date |
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US3904328A true US3904328A (en) | 1975-09-09 |
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Application Number | Title | Priority Date | Filing Date |
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US470268A Expired - Lifetime US3904328A (en) | 1971-11-16 | 1974-05-15 | Rotor for rotary combustion engine |
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US (1) | US3904328A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150167546A1 (en) * | 2013-12-17 | 2015-06-18 | Pratt & Whitney Canada Corp. | Rotary engine with rotor land |
US20190031023A1 (en) * | 2016-02-10 | 2019-01-31 | Magna Powertrain Of America, Inc. | Power transfer assembly with hypoid gearset having optimized pinion unit |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3059585A (en) * | 1959-04-23 | 1962-10-23 | Nsu Motorenwerke Ag | Built-up rotors for rotary engines |
US3125996A (en) * | 1964-03-24 | Hoschele | ||
US3289647A (en) * | 1964-08-24 | 1966-12-06 | Curtiss Wright Corp | Cooling system for multi-unit rotary mechanisms |
US3333763A (en) * | 1966-02-02 | 1967-08-01 | Nsu Motorenwerke Ag | Sealing arrangement for rotary engines |
US3369740A (en) * | 1966-05-04 | 1968-02-20 | Kloeckner Humboldt Deutz Ag | Rotary piston internal combustion engine, especially circular piston internal combustion engine |
US3440929A (en) * | 1966-11-10 | 1969-04-29 | Sachsenring Automobilwerke | Rotary piston type of combustion engine |
US3461848A (en) * | 1966-09-08 | 1969-08-19 | Daimler Benz Ag | Piston for a rotary piston internal combustion engine |
US3469505A (en) * | 1966-09-07 | 1969-09-30 | Daimler Benz Ag | Polygonal piston for a rotary piston internal combustion engine |
US3829944A (en) * | 1971-11-16 | 1974-08-20 | Rudi Nsu Auto Union Ag | Rotor for rotary combustion engine and method of making the same |
-
1974
- 1974-05-15 US US470268A patent/US3904328A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3125996A (en) * | 1964-03-24 | Hoschele | ||
US3059585A (en) * | 1959-04-23 | 1962-10-23 | Nsu Motorenwerke Ag | Built-up rotors for rotary engines |
US3289647A (en) * | 1964-08-24 | 1966-12-06 | Curtiss Wright Corp | Cooling system for multi-unit rotary mechanisms |
US3333763A (en) * | 1966-02-02 | 1967-08-01 | Nsu Motorenwerke Ag | Sealing arrangement for rotary engines |
US3369740A (en) * | 1966-05-04 | 1968-02-20 | Kloeckner Humboldt Deutz Ag | Rotary piston internal combustion engine, especially circular piston internal combustion engine |
US3469505A (en) * | 1966-09-07 | 1969-09-30 | Daimler Benz Ag | Polygonal piston for a rotary piston internal combustion engine |
US3461848A (en) * | 1966-09-08 | 1969-08-19 | Daimler Benz Ag | Piston for a rotary piston internal combustion engine |
US3440929A (en) * | 1966-11-10 | 1969-04-29 | Sachsenring Automobilwerke | Rotary piston type of combustion engine |
US3829944A (en) * | 1971-11-16 | 1974-08-20 | Rudi Nsu Auto Union Ag | Rotor for rotary combustion engine and method of making the same |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150167546A1 (en) * | 2013-12-17 | 2015-06-18 | Pratt & Whitney Canada Corp. | Rotary engine with rotor land |
US9896934B2 (en) * | 2013-12-17 | 2018-02-20 | Pratt & Whitney Canada Corp. | Rotary engine with rotor land |
US20190031023A1 (en) * | 2016-02-10 | 2019-01-31 | Magna Powertrain Of America, Inc. | Power transfer assembly with hypoid gearset having optimized pinion unit |
US11021054B2 (en) * | 2016-02-10 | 2021-06-01 | Magna Powertrain Of America, Inc. | Power transfer assembly with hypoid gearset having optimized pinion unit |
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