EP2752552B1 - Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine - Google Patents

Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine Download PDF

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Publication number
EP2752552B1
EP2752552B1 EP14163230.7A EP14163230A EP2752552B1 EP 2752552 B1 EP2752552 B1 EP 2752552B1 EP 14163230 A EP14163230 A EP 14163230A EP 2752552 B1 EP2752552 B1 EP 2752552B1
Authority
EP
European Patent Office
Prior art keywords
rotor housing
fixing
rotary machine
core assembly
holes
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.)
Not-in-force
Application number
EP14163230.7A
Other languages
English (en)
French (fr)
Other versions
EP2752552A1 (de
Inventor
Christopher John Biddulph
Roy Richmond
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.)
UAV Engines Ltd
Original Assignee
UAV Engines 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 UAV Engines Ltd filed Critical UAV Engines Ltd
Priority to EP14163230.7A priority Critical patent/EP2752552B1/de
Publication of EP2752552A1 publication Critical patent/EP2752552A1/de
Application granted granted Critical
Publication of EP2752552B1 publication Critical patent/EP2752552B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01C1/22—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
    • 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
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/106—Stators; Members defining the outer boundaries of the working chamber with a radial surface, e.g. cam rings
    • 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
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F04C2230/603—Centering; Aligning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/805—Fastening means, e.g. bolts

Definitions

  • the invention relates to a rotary machine core assembly and to a rotary machine comprising the rotary machine core assembly.
  • the endplates of a rotary engine are held in place against the sides of the engine rotor housing using a through bolt or threaded stud located through each endplate and extending through the rotor housing.
  • the rotor housing is made of Aluminium and the through bolts are typically made of steel alloy.
  • the rotor housing defines a trochoid bore within which the engine rotor rotates during operation. When the engine is running there is a thermal distribution around the circumference of the rotor housing trochoid bore, a cooler region existing around the area of engine induction and a hotter region being associated with the ignition and power phase of the engine cycle.
  • the regions of the trochoid which become hotter have either engine cooling fins or a liquid coolant passageway provided within the rotor housing to assist with cooling.
  • a general, measurable distortion of the rotor housing caused by the heat generated during operation.
  • a surface coating, such as nickel silicone is applied to the aluminium surface of the rotor housing defining the trochoid bore, to create a suitable wear surface.
  • the distortion of the aluminium rotor housing leads to adhesion/cracking issues in surface coating, which ultimately leads to a loss in engine performance and/or increased engine maintenance.
  • the distortion of the rotor housing reduces the effectiveness of the gas seal between the rotor housing and the endplate.
  • the distortion of the rotor housing results in a reduction in the clamping load provided by the through bolt arrangement, which can result in increased surface fretting between the rotor housing and the endplate.
  • the arrangement of the fixing holes and the mechanical fixing elements allows the rotor housing to expand when it becomes hotter during operation within a rotary machine, such as a rotary engine or a rotary compressor.
  • the compressive distortion of the rotor housing which occurs in prior art rotary engines may thus be reduced or substantially eliminated.
  • the associated adhesion/cracking issues in the surface coating of the trochoid bore may be reduced or substantially eliminated, which improve machine performance and/or reduce machine maintenance.
  • the effectiveness of the gas seal between the rotor housing and the endplate may be maintained and the clamping load between the rotor housing and the endplates may be maintained, may reduce or substantially eliminate surface fretting between the rotor housing and one or both endplates.
  • the rotor housing additionally has at least one single fixing hole provided therein, extending from a respective one of the sides of the rotor housing part-way into the rotor housing. At least one correspondingly located through hole is provided in a respective one of the endplates and at least one additional mechanical fixing element is located through the through hole in the respective endplate and is received in the single fixing hole.
  • a plurality of single fixing holes are provided in the rotor housing, with correspondingly located though holes provided in the or each respective end plate and a plurality of mechanical fixing elements are provided, each located through a respective through hole in the respective endplate and received in the respective single fixing hole.
  • each mechanical fixing element extends part-way into the respective fixing hole. This may increase the amount of thermally induced expansion which the rotor housing is able to accommodate.
  • a respective connecting bore is provided through the rotor housing between the ends of the oppositely located fixing holes of each pair. This may increase the amount of thermally induced expansion which the rotor housing is able to accommodate.
  • the connecting bore has a diameter which is less than a diameter of each of the fixing holes of the respective pair.
  • the connecting bore is a tapping hole. Providing the connecting bore with a smaller diameter than the fixing holes may provide a 'stop' for the respective filing element at the end of each fixing hole.
  • each mechanical fixing element comprises one of a threaded stud and a threaded bolt.
  • each fixing hole has a complementary internal thread provided on at least part of its length.
  • a first example not according to the invention provides a rotary machine core assembly 10 comprising a rotor housing 12, a first endplate 14, a second endplate 16 and a plurality of mechanical fixing elements 18.
  • the rotor housing 12 defines a trochoid bore 20 for receiving a rotor (not shown) and comprises a plurality of cooling fins 22, arranged extending generally outwardly from the trochoid bore.
  • a plurality of pairs of fixing holes 24 are provided in the rotor housing; in this example 12 pairs of fixing holes are provided.
  • Each pair of fixing holes comprises a first fixing hole 24a and a second fixing hole 24b.
  • Each first fixing hole 24a extends from one side 12a of the rotor housing part-way into the rotor housing and each second fixing hole 24b extends from the opposing side 12b of the rotor housing part-way into the rotor housing.
  • the fixing holes 24a, 24b of each pair are generally co-axially aligned such that they extend towards each other.
  • Each fixing hole has a depth which is less than one half of the thickness of the rotor housing 12, such that the ends of the fixing holes of each pair are spaced from each other.
  • Each fixing hole is provided with an internal thread. In this embodiment a region 26 of solid metal is provided between the ends of the fixing holes.
  • Two dowel location holes 28 are also provided in the rotor housing 12, each extending part-way through the rotor housing.
  • the first endplate 14 is located adjacent the one side 12a of the rotor housing 12 and the second endplate 16 is located adjacent the opposing side 12b of the rotor housing.
  • Each endplate 14, 16 has a plurality of through holes 30, 32 provided in it.
  • each endplate has 12 through holes 30, 32 provided in it, matching the number of pairs of fixing holes 24 in the rotor housing.
  • the through holes are correspondingly located with the fixing holes on the respective side of the rotor housing, so that the through holes in each endplate are aligned with the respective fixing holes 24a, 24b in the rotor housing.
  • Each endplate 14, 16 is provided with two dowel pins 34, in the form of straight, tubular dowels, for location in the dowel location holes 28 in the rotor housing 12, to correctly align each endplate 14, 16 against the respective side of the rotor housing.
  • mechanical fixing elements 18a, 18b are provided through each endplate 14, 16.
  • Each mechanical fixing element 18a, 18b is located through a respective through hole 30, 32 in its respective endplate and is received in the respective fixing hole 24a, 24b in the rotor housing.
  • each mechanical fixing element 18a, 18b has a length which is less than the combined depth of the respective through hole 30, 32 and the respective fixing hole 24a, 24b. The ends of oppositely located fixing elements 18a, 18b are therefore spaced from each other.
  • the mechanical fixing elements 18a located through the first endplate 14 each comprise externally threaded bolts.
  • the mechanical fixing elements 18b located through the second endplate 16 each comprise externally threaded studs, with a fixing nut located at the external end of the stud 18b to secure the stud in place.
  • each of the mechanical fixing elements 18a, 18b may be either one of a threaded bolt or a threaded stud plus a nut. Other types of mechanical fixing elements may also be used.
  • the spacing of the ends of the fixing holes 24a, 24b and the mechanical fixing elements 18a, 18b allows the rotor housing 12 to expand when it becomes hotter during operation as part of a rotary machine, such as a rotary engine or a rotary compressor.
  • An embodiment of the invention provides a rotary machine core assembly 40 as shown in Figure 3 .
  • the rotary machine core assembly 40 of this embodiment is similar to the rotary machine core assembly 10 of Figures 1 and 2 , with the following modifications.
  • the same reference numbers are retained for corresponding features.
  • the fixing holes 42a, 42b each comprise open ended holes.
  • Respective connecting bores 44 are provided between the ends of the fixing holes 42a, 42b of each pair.
  • the connecting bores 44 have a smaller diameter than the fixing holes 42a, 42b so that the mechanical fixing elements 18a, 18b cannot extend into the respective connecting bore 44.
  • the provision of the connecting bores 44 may increase the amount of thermally induced expansion which the rotor housing 12 is able to accommodate.
  • FIG. 4 An example not according to the invention provides a rotary machine core assembly 50 as shown in Figure 4 .
  • the rotary machine core assembly 50 of this example is similar to the rotary machine core assembly 10 of Figures 1 and 2 , with the following modifications.
  • the same reference numbers are retained for corresponding features.
  • the fixing holes 58a, 58b have larger diameter openings at the respective sides 12a, 12b of the rotor housing 12.
  • the through holes 54, 56 have correspondingly larger openings at their ends which meet the fixing holes.
  • the fixing holes 58a, 58b are spaced from each other, with a smaller separation, provided by a region 52 of solid metal between their ends.
  • FIG. 5 An example not according to the invention provides a rotary machine 60 as shown in Figure 5 .
  • the rotary machine 60 of this example takes the form of a rotary engine 60. It will be appreciated by the person skilled in the art that the rotary machine 60 may alternatively take the form of a rotary compressor.
  • the rotary engine 60 comprises a rotary machine core assembly 10 as shown in Figure 1 and a rotor 62.
  • the rotor 62 is located within the trochoid bore 20 of the rotor housing 12 and is arranged to rotate within the trochoid bore during operation of the engine 60.
  • the operation of rotary engines will be well known to the person skilled in the art and will not be described in further detail here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (6)

  1. Kerngehäusebaugruppe (10, 40, 50) einer Rotationsmaschine, umfassend:
    ein Rotorgehäuse (12), das eine trochoidale Bohrung (20), wobei das Rotorgehäuse eine Vielzahl darin vorgesehener Paare von Befestigungslöchern (24a, 24b, 42a, 42b, 58a, 58b) aufweist, jedes Paar von Befestigungslöchern ein erstes Befestigungsloch (24a, 42a, 58a), das sich ab einer Seite (12a) des Rotorgehäuses teilweise in das Rotorgehäuse erstreckt und ein zweites Befestigungsloch (24b, 42b, 58b) umfasst, das sich von einer entgegengesetzten Seite (12b) des Rotorgehäuses aus teilweise in das Rotorgehäuse erstreckt, wobei die Befestigungslöcher generell koaxial derartig ausgerichtet sind, dass sie sich in Richtung aufeinander erstrecken und jedes Befestigungsloch eine Tiefe derartig aufweist, dass die Enden der Befestigungslöcher voneinander beabstandet sind;
    eine erste Endplatte (14), die sich angrenzend an die eine Seite des Rotogehäuses befindet und eine zweite Endplatte (16), die sich angrenzend an die entgegengesetzte Seite des Rotorgehäuses befindet, wobei jede Endplatte eine Vielzahl darin vorgesehener Durchgangslöchern (30, 32, 54, 56) aufweist, wobei die Durchgangslöcher den Befestigungslöchern entsprechend auf der jeweiligen Seite des Rotorgehäuses positioniert sind;
    eine Vielzahl mechanischer Befestigungselemente (18a, 18b), wobei jedes mechanische Befestigungselement durch ein jeweiliges Durchgangsloch hindurch in einer der Endplatten positioniert wird und im jeweiligen Befestigungsloch im Rotorgehäuse derartig aufgenommen wird, dass die Enden von entgegengesetzt positionierten Befestigungselementen voneinander beabstandet sind; und
    wobei sich jedes mechanische Befestigungselement (18a, 18b) teilweise in das jeweilige Befestigungsloch erstreckt, dadurch gekennzeichnet, dass eine jeweilige Verbindungsbohrung (44) durch das Rotorgehäuse zwischen den Enden der entgegengesetzt positionierten Befestigungslöchern (42a, 42b) jedes Paares bereitgestellt ist, wobei die Verbindungsbohrung (42) einen Durchmesser aufweist, der geringer als ein Durchmesser jedes der Befestigungslöcher (42a, 42b) des jeweiligen Paares ist.
  2. Kerngehäusebaugruppe einer Rotationsmaschine wie in Anspruch 1 beansprucht, wobei das Rotorgehäuse zusätzlich mindestens ein einzelnes darin vorgesehenes Befestigungsloch aufweist, das sich von einer jeweiligen der Seiten (12a, 12b) des Rotogehäuses teilweise in das Rotorgehäuse erstreckt, und ein entsprechend positioniertes Durchgangsloch in einer jeweiligen der Endplatten (14, 16) bereitgestellt ist, und mindestens ein zusätzliches mechanisches Befestigungselement durch das Durchgangsloch hindurch in der jeweiligen Endplatte positioniert ist und im einzelnen Befestigungsloch aufgenommen wird.
  3. Kerngehäusebaugruppe nach einem vorhergehenden Anspruch, wobei jedes mechanische Befestigungselement einen Gewindezapfen (18b) und einen Gewindebolzen (18a) umfasst.
  4. Rotationsmaschine (60), die eine Kerngehäusebaugruppe (10, 40, 50) einer Rotationsmaschine, wie in einem vorhergehenden Anspruch beansprucht, umfasst.
  5. Rotationsmaschine (60), die eine Kerngehäusebaugruppe (10, 40, 50) einer Rotationsmaschine, wie in einem der Ansprüchen 1 bis 3 beansprucht, umfasst.
  6. Rotationskompressor, der eine Kerngehäusebaugruppe (10, 40, 50) einer Rotationsmaschine, wie in einem der Ansprüchen 1 bis 3 beansprucht, umfasst.
EP14163230.7A 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine Not-in-force EP2752552B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14163230.7A EP2752552B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14163230.7A EP2752552B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine
EP12169534.0A EP2666961B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP12169534.0A Division EP2666961B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine
EP12169534.0A Division-Into EP2666961B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine

Publications (2)

Publication Number Publication Date
EP2752552A1 EP2752552A1 (de) 2014-07-09
EP2752552B1 true EP2752552B1 (de) 2018-07-04

Family

ID=48534445

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14163230.7A Not-in-force EP2752552B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine
EP12169534.0A Not-in-force EP2666961B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP12169534.0A Not-in-force EP2666961B1 (de) 2012-05-25 2012-05-25 Kerngehäusebaugruppe einer Rotationsmaschine und Rotationsmaschine

Country Status (2)

Country Link
EP (2) EP2752552B1 (de)
WO (1) WO2013175217A1 (de)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2700522A1 (de) * 1977-01-07 1978-07-13 Borsig Gmbh Gekapselter rotationskolbenkompressor, insbesondere kaeltekompressor
CH666517A5 (en) * 1985-03-28 1988-07-29 Gisela Weber Internally toothed pump or motor - has crescent shaped element between rolling pinion and toothed ring, secured by two screws
DE19645886C2 (de) * 1996-11-07 1998-10-08 Bosch Gmbh Robert Schraubverbindung mit Befestigungsschraube
DE19812853A1 (de) * 1998-03-21 1999-09-23 Ernst Juraschka Epi- und Hypozylkloidische Drehkolbenmaschine mit Rollen oder Rollensegmente als Dichtmodule
DE102007018793A1 (de) * 2007-04-20 2008-10-23 Abi Anlagentechnik-Baumaschinen- Industriebedarf Maschinenfabrik Und Vertriebsgesellschaft Mbh Vorrichtung zur Fluidförderung
US7828537B2 (en) * 2007-09-28 2010-11-09 Totyo Nedyalkov Parvov Rotary engine with inlet and outlet valves
DE102008015031B4 (de) * 2008-03-17 2014-10-23 Wankel Super Tec Gmbh Gehäuse für einen Kreiskolbenmotor und Kreiskolbenmotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2666961A1 (de) 2013-11-27
EP2752552A1 (de) 2014-07-09
EP2666961B1 (de) 2017-06-28
WO2013175217A1 (en) 2013-11-28

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