EP0891470B1 - Rotary piston engine - Google Patents
Rotary piston engine Download PDFInfo
- Publication number
- EP0891470B1 EP0891470B1 EP97916399A EP97916399A EP0891470B1 EP 0891470 B1 EP0891470 B1 EP 0891470B1 EP 97916399 A EP97916399 A EP 97916399A EP 97916399 A EP97916399 A EP 97916399A EP 0891470 B1 EP0891470 B1 EP 0891470B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary piston
- rotary
- housing
- piston engine
- engine according
- 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
Images
Classifications
-
- 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
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/082—Details specially related to intermeshing engagement type machines or engines
- F01C1/084—Toothed wheels
-
- 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
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/082—Details specially related to intermeshing engagement type machines or 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
- F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
- F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
- F01C1/126—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with elements extending radially from the rotor body not necessarily cooperating with corresponding recesses in the other rotor, e.g. lobes, Roots type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/04—PTFE [PolyTetraFluorEthylene]
Definitions
- This invention refers generally to a rotary piston machine, and more specifically to a rotary piston engine of the type given in the preamble of claim 1.
- a rotary piston engine of this sort is known from DE 38 10 498 Al, which will be described in greater detail below.
- a rotary piston engine or, more generally, a rotary piston machine represents the inverse of a rotary piston compressor (Meiers Lexikon dertechnik und der angewandten Natur Giveawayshaften, 1969, p. 624).
- Rotary piston compressors have the advantage over reciprocating piston compressors of the elimination of valves and crank drive, but the disadvantage of relatively high leakage losses.
- a rotary piston compressor with two shafts constitutes the so-called Roots blower with two rotary pistons that have a lemniscate shape and are affixed to two shafts coupled by equal-size toothed gears and rotating in opposite directions when one shaft is driven.
- the pistons convey a volume of gas contained between the pistons and the housing wall from the suction to the compression side.
- a rotary motion occurs when compressed air is admitted to the rotary pistons, which change their effective area during the rotation.
- This rotary motion can be transferred through a wheel gearing to the output shaft and used here for example to drive a boring spindle.
- This known case involves a pneumatic tool in which the aforementioned high leakage losses can readily be tolerated.
- a rotary piston engine of this type has a poor efficiency by nature and because of its leakage losses could not be used for example as a swivel actuator, which should have precise positioning capabilities.
- a known rotary piston engine of this kind it is not easily possible to adjust the nominal output to the requirement.
- the aforementioned leakage losses are not only caused by the minimal sealing gaps between the rotary pistons and the housing wall. They also have their origin in a dead space that is formed when the rotary pistons assume positions in which, together with each other and with the housing wall, they delimit the smallest possible volume that their design allows, opposite the compressed medium inlet and outlet.
- a dead space is the space in which compressed medium that can not be further compressed or displaced is still present. The less the rotary pistons in the aforementioned position are capable of closing off the compressed medium inlet and/or outlet, the larger is the effective dead space.
- an air intake port is provided as the compressed medium inlet, and air outlet orifices are provided as the compressed medium outlet.
- the DE 38 10 498 A1 does not reveal how these are designed and where they are disposed.
- the inner wall of the housing has a figure-eight cross section formed by two intersecting cylinders, as is also known in a similarly constructed blower from the US 24 92 935, Figure 1.
- the intake port and the outlet port of this blower comprise large bores such as those also known from the DE-A 12 55 848 and the EP 0 209 788 A2.
- the object of the invention is to design a rotary piston engine of the type given in the preamble of claim 1 such that leakage losses and a large dead space are avoided while a simple engine structure is maintained, and the engine can also be employed as a swivel actuator.
- the leakage problems are reduced in that in the housing, which on the inside comprises two intersecting cylinders, the narrow intake slot is located in the area of the constriction of the figure-eight formed by the intersecting cylinders. Due to the narrowness of the intake slot and due to its position a dead space of minimal volume results when the two rotary pistons are in the given position. Furthermore, the wide outlet slot is disposed in one of the cylinders directly adjacent to the constricted portion of the figure-eight. It is therefore possible for the rotary piston moving in this cylinder to completely close off the outlet slot. At this moment there is virtually no further compressed medium loss at all, since a uniform pressure predominates throughout the entire interior of the engine, due to the fact that the rotary piston completely closes off the outlet slot.
- a pressure difference delta P occurs only after the rotary piston has opened the outlet slot again.
- this construction of the rotary piston engine according to the invention makes it possible to use the engine as a swivel actuator as well, since the leakage problems are avoided according to the invention in the manner described above.
- the engine according to the invention can pivot a flap or the like in a swiveling range of 360° in one direction of rotation, which is the most favorable configuration with this particular position and orientation of the outlet slot.
- the swiveling can also take place in the other direction of rotation, albeit with a somewhat poorer efficiency. Since the high leakage losses that appear in the state of the art are avoided in the rotary piston engine according to the invention, this rotary piston engine is substantially more efficient and can be better controlled.
- the or each rotary piston that is elastically deformable at least on its surface is provided with an elastic coating, the same advantages result as in the aforementioned embodiment of the invention. However, production becomes easier and the form stability is improved when the or each rotary piston is merely elastically deformable on its surface.
- each rotary piston that is elastically deformable at least on its surface consists of an elastomer, at least the rotary pistons can be produced particularly easily.
- one rotary piston can be non-elastically produced and/or made with no elastic coating, without affecting the efficiency of the rotary piston engine according to the invention.
- both rotary pistons can be produced as metallic extruded sections that are subsequently provided with an elastic coating.
- the rotary pistons can be made of any material that can be extruded.
- one or both of the two rotary pistons can also be extruded from an elastomer such as carbon ceramics.
- the housing can consist of fiber glass reinforced plastic or of metal.
- the output of the rotary piston engine can be selected by selection of the length of the extruded sections.
- engines with any output can be produced merely by choosing the appropriate length of the rotary pistons and of the housing, or by axially joining standard sections of the rotary pistons and of the housing.
- rotary pistons are designed as hollow sections, the structure of the rotary piston engine according to the invention is particularly economical in terms of material and weight.
- a rotary piston engine designated as a whole as 10 in Figs. 1 and 2 has a substantially rectangular housing 12 that is closed at its two ends by covers 14 and 16.
- the covers 14 and 16 are removably secured to the housing by screws or the like not shown here.
- Two shafts 18 and 20 are arranged in the housing 12 and rotate in bearings provided in the covers 14, 16, as Fig. 1 clearly shows. Further details of the bearings are of no interest here with regard to the invention.
- the shafts 18, 20 are coupled by a wheel gearing labeled as a whole with 22.
- the wheel gearing 22 here comprises two equal-size meshing toothed gears 24, 26, as Fig. 1 also clearly reveals.
- the toothed gears 24, 26 are wedged onto the associated ends of the shafts 18 and 20, respectively.
- the shaft 20 extends out of the housing to form the driven shaft of the rotary piston engine 10.
- the shaft 18 bears a rotary piston 28, and the shaft 20 bears a rotary piston 30.
- the rotary pistons 28, 30 are in contact with one another and with the inner housing wall 32.
- the rotary piston engine 10 is operated with a compressed medium, namely compressed air in the embodiment represented here.
- the compressed air is fed to the rotary piston engine 10 via an inlet passageway 34 designed as a bore and reaches the interior of the engine via an intake slot 36 extending the entire axial length of the housing wall 32, where it applies pressure to the rotary pistons 28, 30 in a known manner, thereby causing them to rotate.
- the rotary pistons 28, 30 alter their effective area while rotating, resulting in a rotating movement that is transmitted to the output shaft via the wheel gearing 22.
- the compressed air that has done the work finally passes into an outlet passageway 40 likewise designed as a bore via a wider outlet slot 38 likewise extending the entire axial length of the housing wall 32.
- the inner wall 32 of the housing 12 has a figure-eight-shaped cross section formed by two intersecting cylinders.
- the intake slot 36 is disposed in the area of the constriction of the figure-eight formed by the intersecting cylinders. Due to the narrowness of the slot 36 and due to its position and orientation, a dead space of minimal volume is formed when the rotary pistons 28, 30 are in the given position in which they delimit the smallest volume.
- the outlet slot 38 is located in one of the cylinders, directly adjacent to the constriction of the figure-eight, as is shown in Fig. 2. It is therefore possible for the rotary piston 28 to completely close off the outlet slot 38.
- the rotary pistons 28, 30 are under elastic pressure in sealing contact with each other and with the housing wall 32.
- Various designs of the rotary pistons and the inner housing wall 32 are possible for this and will now be dealt with in detail.
- both rotary pistons are elastically deformable, whereas the inner housing wall 32 is not.
- the rotary pistons 28, 30 are constantly in mutual and sealed rolling contact with each other and are for the most part constantly in sealed gliding contact with the housing wall 32.
- the rotary piston 28 is made elastically deformable in the embodiment shown in that it consists entirely of an elastomer.
- the rotary piston 30 is made elastically deformable in that it is a rigid section itself that bears an elastic coating 42 on its exterior.
- the two rotary pistons 28, 30 are each designed as extruded sections. However, after being produced by extrusion, the rotary piston 30 is provided with the elastic coating 42 on its exterior.
- the coating 42 can be applied by spraying.
- the housing 12 in the embodiment shown consists of a light metal such as aluminum or of a fiber glass reinforced plastic.
- the core of the rotary piston 30 can also be made of fiber glass reinforced plastic; its exterior then additionally has the elastic plastic coating 42.
- the coating could also simply be an elastic sheath (not shown) held at a distance from the rotary piston or from the housing wall by a fluid. The fluid would yield when elastic pressure is exerted.
- a further embodiment would consist in making both of the rotary pistons 28, 30 out of an elastomer such as carbon ceramics or both out of a rigid material and in the latter case providing the exteriors of both with an elastic coating such as the coating 42 or the aforementioned sheath.
- one rotary piston is rigid and the other one is provided with a plastic coating or made of an elastomer, and in addition the housing wall 32 is provided with an elastic coating 44 to produce a seal between the latter rotary piston and the housing wall 32, as the reference number 44 merely hints at in Fig. 2.
- a preferred field of application of the rotary piston engine is its use as a swivel actuator with a positioning stroke of 360° and with a very high degree of positioning accuracy.
- a particular advantage of the embodiment of the rotary piston engine 10 described here with two elastically deformable rotary pistons - irrespective of whether the pistons themselves are elastically deformable or whether one of them and the housing or both rotary pistons are provided with an elastic coating or are elastically designed - is that no lubricant is required between the rotary pistons on the one hand and between the rotary pistons and the housing on the other.
- the elastic coating of the rotary piston or pistons and/or of the housing wall 32 can namely be of Teflon, for example, which renders any lubricant superfluous.
- Hollow sections can be considered for the extruded sections for the rotary pistons 28, 30, as Fig. 2 hints at with the example of the rotary piston 28.
- the nominal output that the rotary piston engine 10 is to deliver can be selected in a simple manner by selection of the appropriate length of the extruded sections (rotary pistons and housing).
- the rotary piston engine 10 offers the possibility of simply selecting the output by selecting the length of the rotary pistons and of the housing, since the intake slot 36 and the outlet slot 38 each extend over the entire axial length of the housing 12 and are thus open at both ends of the housing.
- the axial closure of these slots 36, 38 is made by the covers 14, 16. If, instead of the intake slot 36 and the outlet slot 38, a rotary piston engine had large radially extending bores, as is provided in the state of the art described above, it could not have a housing designed as a simple extruded section.
- the rotary piston engine described here can be used inversely as a charger to charge internal combustion engines, i.e. as a compressor for the precompression of the combustion air or of the air/fuel mixture, to enhance the performance of internal combustion engines.
- the rotary piston machine is mechanically driven by the internal combustion engine or by an exhaust turbine.
- this use of the rotary piston machine is known in principle from the US 24 92 935 already mentioned above.
- the design of the machine according to the invention permits a far better efficiency and is particularly well suited for use as a charger in diesel engines of ceramic material.
Description
- Fig. 1
- shows a longitudinal section of a rotary piston engine according to the invention,
- Fig. 2
- shows a cross section of the rotary piston engine through line II-II in Fig. 1
Claims (10)
- A rotary piston engine with a housing (12) having a compressed medium intake (36) and a compressed medium outlet (38) and with an inner wall (32) having a figure-eight cross section formed by two intersecting cylinders, with two shafts (18, 20) rotating in bearings in the housing (12) and coupled by a wheel gearing (22), and with a first and a second rotary piston (28, 30) having a lemniscate-shaped cross section and being secured to the shafts (18, 20) and further being put into rotary motion in the housing (12) by admission of a compressed medium, said rotary motion being usable for the drive via the one or the other shaft (20), characterized in thatthe housing (12) is an extruded section,the rotary pistons (28, 30) are extruded sectionsthe rotary pistons (28, 30) contact each other and the housing wall (32) under elastic pressure.the compressed medium intake is a narrow slot (36) extending the length of the inner housing wall (32) and opening into the interior of the housing in the plane of the constriction of the figure-eight, andthe compressed medium outlet is a slot (38) that is wider than the narrow slot (36) and leads from the interior of the housing (12) in one of the two cylinders, directly adjacent to the constriction of the figure-eight.
- The rotary piston engine according to claim 1, characterized in that at least the first rotary piston (28, 30) and the housing wall (32) are elastically deformable at least on their surfaces.
- The rotary piston engine according to claim 2, characterized in that at least the two rotary pistons (28, 30) are designed to be elastically deformable at least on their surfaces.
- The rotary piston engine according to claim 2 or 3, characterized in that the or each rotary piston (28, 30) that is elastically deformable at least on the surface is provided with an elastic coating (42).
- The rotary piston engine according to claim 2 or 3, characterized in that the or each rotary piston (28, 30) that is elastically deformable at least on the surface consists of an elastomer.
- The rotary piston engine according to any of claims 1 to 5, characterized in that the housing wall (32) is provided with an elastic coating (44).
- The rotary piston engine according to any of claims 1 to 6, characterized in that the housing (12) consists of fiber glass reinforced plastic or of metal.
- The rotary piston engine according to any of claims 1 to 7, characterized in that one or both rotary pistons (28, 30) are designed as hollow sections.
- The rotary piston engine according to claim 2, characterized in that the second rotary piston (30) consists of a rigid material.
- The rotary piston engine according to claim 8, characterized in that one or both rotary pistons (28, 30) consist of an elastomer such as carbon ceramics.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19613262 | 1996-04-02 | ||
DE19613262A DE19613262A1 (en) | 1996-04-02 | 1996-04-02 | Rotary piston rotary engine |
PCT/EP1997/001549 WO1997037106A1 (en) | 1996-04-02 | 1997-03-26 | Rotary piston engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0891470A1 EP0891470A1 (en) | 1999-01-20 |
EP0891470B1 true EP0891470B1 (en) | 1999-12-08 |
Family
ID=7790326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97916399A Expired - Lifetime EP0891470B1 (en) | 1996-04-02 | 1997-03-26 | Rotary piston engine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0891470B1 (en) |
AU (1) | AU2506097A (en) |
DE (2) | DE19613262A1 (en) |
WO (1) | WO1997037106A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999052750A1 (en) * | 1998-04-08 | 1999-10-21 | Robert Bosch Gmbh | Rain sensor |
DE102008037903A1 (en) | 2007-08-31 | 2009-03-05 | Cor Pumps + Compressors Ag | Method of converting compressed air energy into mechanical energy and compressed air motor therefor |
DE102008037841A1 (en) | 2007-08-31 | 2009-03-05 | Cor Pumps + Compressors Ag | Method for converting compressed air energy into electrical energy and carrying out the method with a compressed air motor |
DE102008045440B4 (en) * | 2008-09-02 | 2017-02-09 | Börger GmbH | Rotary piston of a rotary lobe pump and rotary lobe pump |
DE102018210430A1 (en) * | 2018-06-26 | 2020-01-02 | Leybold Gmbh | Displacer, rotor and device of a vacuum pump and method for producing a displacer and a rotor of a vacuum pump |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE33161C (en) * | ||||
GB413170A (en) * | 1932-11-05 | 1934-07-12 | Carl Jaeger | Improvements in rotary engines or pumps |
GB552341A (en) * | 1941-12-09 | 1943-04-02 | William Richard Hammond | Improvements in or relating to rotary pumps |
US2492935A (en) * | 1943-11-22 | 1949-12-27 | Borg Warner | Rotary blower with abrading rotor ends and abradable casing sealing ridges |
GB620901A (en) * | 1944-02-16 | 1949-03-31 | Philips Nv | Improvements in or relating to cylindrical objects manufactured by an extrusion process |
US3059835A (en) * | 1960-01-12 | 1962-10-23 | Gen Motors Corp | Rotary blower |
DE1255848B (en) * | 1961-12-27 | 1967-12-07 | Daimler Benz Ag | Rotary piston machine |
JPH0623753Y2 (en) * | 1985-07-26 | 1994-06-22 | トヨタ自動車株式会社 | Roots pump |
DE3621178A1 (en) * | 1986-06-25 | 1988-01-07 | Wankel Gmbh | Piston of a rotary piston ventilator with an external axis |
JPS63243478A (en) * | 1987-03-30 | 1988-10-11 | Aisin Seiki Co Ltd | Rotor for fluid equipment |
JPH01249975A (en) * | 1988-03-31 | 1989-10-05 | Ngk Insulators Ltd | Rotor and roots pump provided with rotor |
JPH01294985A (en) * | 1988-05-24 | 1989-11-28 | Ebara Corp | Roots type blower plastic rotor |
US4938670A (en) * | 1989-10-02 | 1990-07-03 | Tocew Lee | Rotary fluid machine |
-
1996
- 1996-04-02 DE DE19613262A patent/DE19613262A1/en not_active Withdrawn
-
1997
- 1997-03-26 AU AU25060/97A patent/AU2506097A/en not_active Abandoned
- 1997-03-26 EP EP97916399A patent/EP0891470B1/en not_active Expired - Lifetime
- 1997-03-26 WO PCT/EP1997/001549 patent/WO1997037106A1/en active IP Right Grant
- 1997-03-26 DE DE69700914T patent/DE69700914T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE19613262A1 (en) | 1997-10-09 |
EP0891470A1 (en) | 1999-01-20 |
DE69700914D1 (en) | 2000-01-13 |
DE69700914T2 (en) | 2000-05-18 |
AU2506097A (en) | 1997-10-22 |
WO1997037106A1 (en) | 1997-10-09 |
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