WO1992010322A1 - Procede de fabrication de rotors s'engrenant ou d'engrenages de precision, par usinage d'un flanc calibre au moyen d'un outil en forme de partie roulante et engrenages fabriques au moyen dudit procede - Google Patents

Procede de fabrication de rotors s'engrenant ou d'engrenages de precision, par usinage d'un flanc calibre au moyen d'un outil en forme de partie roulante et engrenages fabriques au moyen dudit procede Download PDF

Info

Publication number
WO1992010322A1
WO1992010322A1 PCT/SE1991/000829 SE9100829W WO9210322A1 WO 1992010322 A1 WO1992010322 A1 WO 1992010322A1 SE 9100829 W SE9100829 W SE 9100829W WO 9210322 A1 WO9210322 A1 WO 9210322A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotors
rotor
elevations
interacting
flanks
Prior art date
Application number
PCT/SE1991/000829
Other languages
English (en)
Inventor
Sven-Åke ROSELL
Original Assignee
Rosell Sven Aake
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 Rosell Sven Aake filed Critical Rosell Sven Aake
Publication of WO1992010322A1 publication Critical patent/WO1992010322A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F15/00—Methods or machines for making gear wheels of special kinds not covered by groups B23F7/00 - B23F13/00
    • B23F15/08—Making intermeshing rotors, e.g. of pumps
    • 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

Definitions

  • This invention relates to a method for manufacturing of inter ⁇ acting rotors for rotating displacement machines and precision gearwheels where intermeshing engaging elements are unrolling relative each others during the rotation.
  • the invention relates as well to rotors manufactured by the method.
  • the invention is primarily applicable on machines of displace ⁇ ment type equipped with scew- or tooth rotors.
  • scew- or tooth rotors During the rota ⁇ tion of the interacting rotors one or more lobes or teeth with adequate geometrical shape on one of the rotors intermeshes with the corresponding gap of lobe or tooth on the other rotor.
  • Similar demand on minimized clearance and improved function exist from precision point of view (not from leakage point of view) also on gears for many machine tools and for the rotor synchronizing gears on several types of rotating compressors and expanders.
  • the invention therefore has an important application also on precision gearwheels.
  • the purpose of the invention is to make it possible to produce the wanted small clearances in a less expensive way and with considerable less spreading. Furthermore will it by the inven ⁇ tion be possible to manufacture conical rotors at a very low cost. This will be obtained by the characteristic properties mentioned in the patent claims below.
  • Fig.l shows schematically a fragmentaric sideview of two inter ⁇ meshing gearwheels manufactured by conventional methods.
  • Fig.2 is a section through two teeth on the driven gearwheel in Fig.l who have been shaped as per a first alternative of the invention.
  • Fig.3 shows section 3-3 in Fig.2 before rolled down.
  • Fig. shows section 3-3 in Fig.2 after rolled down.
  • Fig.5 shows in a way corresponding to Fig.2 a second alter ⁇ native.
  • Fig.6 shows an example of the run of the sealingzone, which is very important for certain applications of the invention, along a screw compressor rotor.
  • Fig.7 shows schematically a sideview of two intermeshing rotors when applying the invention.
  • Fig.8 shows a section through the female rotor in Fig.7 shaped as per the invention.
  • Fig.8A shows a partial section of the female rotor in Fig.8.
  • Fig.9 shows a section through an alternative male rotor that corresponds to the male rotor in Fig.7 and which has been shaped as per the invention.
  • Fig.10 shows a female rotor corresponding to Fig.9 and which has been shaped as per the invention.
  • Fig.lOA shows a partial section valid for both the rotor in Fig.9 and in Fig.10.
  • Fig.llA,B shows schematically two sideviews of female- and" " male rotor in a tooth compressor at beginning of com ⁇ pression, A, and during ongoing compression, B.
  • Fig.12 shows a sideview of the female rotor in Fig.llA, B when shaped as per the invention.
  • Fig.l2A shows a partial section through the female rotor in Fig.12.
  • Fig.l shows two intermeshing gearwheels, one, 15, driving and the other, 16, driven, who have been manufactured by conven ⁇ tional methods.
  • the resulting clearance is S.
  • Fig.2 shows the driven gearwheel 16 shaped as per the inven ⁇ tion.
  • the non-driven flank 17 of the toothgap has been given a contour 17 which is some tenth of a millimeter higher than the contour 18 which gives the wanted clearance against the driving wheel.
  • Fig.3 shows how the thus slightly overdimensioned contour 17 of the non-driven flank along its entire width has been given closely located elevations (distance e.g. 05 to 1 mm) with a shape of ridges, tops or pyramids 19 preferably with triangular equilateral or in relation to this more pointed triangular sec ⁇ tion (height e.g. 0.5 to 1 mm).
  • elevations distance e.g. 05 to 1 mm
  • a shape of ridges, tops or pyramids 19 preferably with triangular equilateral or in relation to this more pointed triangular sec ⁇ tion (height e.g. 0.5 to 1 mm).
  • the contour 17 can be obtained by different machining or shaping alternatives, e.g. cutting, chemical (etching), electrically (spark erosion) or plastic (knurling) to be selected optimized with regard to intended application, manufacturing costs and resulting finish.
  • Required pressforce at the rolling down operation can also be influenced by choice of type of pretreatment.
  • ridges 19 as in Fig.3 the required pressure is reduced when the top angle of the ridge is reduced. If e.g. a crossing type of pretreat ⁇ ment pattern is chosen which gives remaining pyramides, the required pressforce gets smaller than for ridges and is further reduced when the top angle of the pyramides is reduced.
  • the rolling down to the wanted contour 18, marked in Fig.4 can be arranged by in a special machine press the driven wheel under rotation against a tool gearwheel and by gradually bringing it closer to this until the intended center distance has been obtained.
  • the teeth of the tool gearwheel has been given the shape that gives the driven wheel its wanted contour to the non-driven flanks of the teeth.
  • a further reduction of the spreading of the teeth clearance will be obtained if the rolling down is done using the actual driving gearwheel as tool at the rolling down operation.
  • the wanted clearance will be obtained by bringing the gearwheels somewhat closer to each other than what corresponds to nominal center distance.
  • the variation of the teeth dimensions for the different samples of the driving gearwheel results in different degree of rolling down of the pretreated surfaces of the driven gearwheel samples why the variation of the teeth clearance between different pairs of driving and driven wheels will be very small.
  • the flanks of the driving gearwheel have been shaped for rolling down.
  • the tool gearwheel will then have a shape that gives the wanted contour to the non-driving flanks of the driving gearwheel.
  • the driven gearwheel can be used as tool.
  • gearwheels subject to low load it is pos ⁇ sible to shape e.g. the two flanks on the driven gearwheel for rolling down as shown in Fig.5.
  • Rolling down can be done by tool gearwheel or by the actual intermeshing driving wheel.
  • the rotors are either not cooled at all or unsufficiently cooled by bores in the shaft center while surrounding housings often are cooled, entirely or partly.
  • the clearances between the two rotors and between rotors and surrounding housings become gradually smaller towards the outlet end during hot running conditions.
  • Fig.6 shows drawn on the male rotor 20, one example on how the sealingzone 21 runs between the rotor 20 and the not shown intermeshing female rotor for a screw compressor with a certain type of conventional rotorprofile.
  • Optimal sealing means that at the pretreatment of the surfaces one wants to make possible to roll down a great number of ridges 19 (Fig.8A) with smallest possible distance (e.g. distance as well as height 0.5 to l mm) who runs in parallel to the sealingline 21 along the entire length of the rotor 22 and distributed periferically around it.
  • the ditches 23 between the ridges 19 can in this parallely running case be left non-filled or filled depending on the results of leakage tests. If for production technique reasons one wants to produce ridges or other patterns who cross the sealingzone, optimal sealing can still be obtained if the ditches that remain between the ridges after the rolling down operation are filled with suitable ceramic (heat-resistant) , polymeric (e.g. teflon-based) or metallic material. Filling with sealing material gives great freedom regarding choice of pretreatment pattern for the rolling down operation.
  • Fig.7 shows schematically a pair of intermeshing rotors, male rotor 20 and female rotor 22, who as per Fig.8 have the female rotor 22 shaped as per the invention.
  • the concave parts A to B, C to D, E to F, etc. have got an overdimension with contour 17, Fig.8A, who is some tenth of a millimeter higher than the wanted contour 18 which gives the wanted optimal clearance towards the male rotor.
  • the pretreatment of the concave parts AB, CD, EF, etc. of the female rotor before the rolling down to the wanted contour is done in the same ways as have been described above for gearwheels.
  • the most favourable pattern from a sealing point of view is a large number of small ridges 19 as per Fig. ⁇ A who runs in parallel to the sealingline 21, Fig.6, between the rotors 20, 22 and who after the rolling down to the wanted contour 18 gets a section as per Fig. ⁇ A.
  • Other patterns, e.g. ridges who are perpendicular to the rotor shaft are also possible but requires as mentioned above that re ⁇ maining ditches after the rolling down are filled with suitable sealing material as the ditches cross the sealingline and otherwise should cause leakage.
  • the rolling down to the wanted contour 18 marked in Fig.8A takes place by in a special machine pressing the female rotor 22 under rotation towards a male toolrotor, in Fig.7 marked with a dash-dotted line and the alternative indication 30, and by gradually bringing the female rotor closer to it, using the rotor 30 as a counterroll until intended center distance NM has been obtained.
  • the male rotor 20 itself could be used as a counterroll.
  • the rotors 30, 20 who work as counter- rolls are given resp. have the shape that gives the concave parts AB, CD, EF, etc. of the female rotor 22 the wanted contour and thereby the wanted clearance towards the convex parts of the male rotors 20 (interlobe clearance) .
  • a further reduction of the spread for interlobe clearance can be obtained if the rolling down, as said above, is done by using the actual male rotor as the tool.
  • the wanted clearance is obtained by bringing the rotors somewhat closer to each other than the nominal center distance.
  • the variation between max. and min. dimension of the convex parts of the different samples of the male rotor results in different degree of rolling down of the pretreated surfaces on the female rotors why the variation of interlobe clearance between different pairs of rotors will be very small.
  • both rotors can be pretreated for rolling down of the actual parts if so wanted.
  • the patterns of the pretreatment can not give any mechanical problems as they after the rolling down are not touching.
  • Fig.9, 10 and lOA shows how male- and female rotors have been shaped as per the invention. Pretreatment is for the female rotor given to the surfaces A to B, C to D, E to F, etc. and for the male rotor to the sur ⁇ faces G ⁇ to H', I' to J', K' to L', etc.
  • the pretreated female rotor 22 is pressed against a tool male rotor which gives the female rotor its wanted con ⁇ tour including conicity.
  • the pretreated male rotor 20 is under rotation pressed against a tool female rotor which gives the male rotor its wanted contour including coni ⁇ city.
  • a single-toothed compressor has been chosen. How ⁇ ever,the invention is equally applicable on multitoothed com ⁇ pressors.
  • Fig.11 shows schematically the rotors 24, 25 in a single-tooth compressor.
  • the sealing line between the rotors is a straight line in parallel with the rotor shafts.
  • the rotors 24, 25 rotate without touching thanks to not shown synchronizing gears.
  • Fig.12, 12A shows the female rotor 24 shaped as per the invention.
  • the rotor surface A over B to C, which during running will seal against the male rotor 25, has from flank to flank been given a contour 17, Fig.l2A, which is some tenth of a millimeter higher than the wanted contour 18.
  • the optimal pretreatment consists of a big number of small ridges 19 parallel with the sealing line along the circum ⁇ ference of the female rotor 24 from point A over point B to C and from flank to flank.
  • the rolling down of the pretreated circumference of the female rotor 24 to the wanted contour 18 can be done by pressing the emale rotor under rotation against a male tool rotor who gives the female rotor its wanted contour when the intended center distance has been obtained.
  • a further reduction of the spread of the interlobe clearance will be obtained if the rolling down takes place using the actual male rotor as tool for the rolling down operation.
  • the wanted clearance will be obtained by bringing the rotors some ⁇ what closer than the nominal center ⁇ distance.
  • the variation between the maximum- and minimum dimension of the different samples of the male rotor results in different degree of rolling down of the pretreated surfaces of the female rotor why the variation of the interlobe clearance between different pair of rotors will be very small.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

Afin de minimiser les espacements et l'étendue des espacements entre les rotors en prise de machines rotatives du type à déplacement, telles que des compresseurs, expandeurs, pompes ou machines similaires, on applique aux flancs d'au moins un des rotors (22), une surdimension (17), dans une opération d'usinage préparatoire, par traitement mécanique de découpe, chimique, électrique ou plastique, produisant une surface à parties élevées, situées à proximité les unes des autres, sous forme de nervures (19) ou de pyramides, dont la surface de roulement est, de préférence, parallèle à celle de la zone de fermeture située entre les rotors s'engrenant. Au moyen d'une friction contre un outil spécial (30) ou contre le rotor s'engrenant (20), on réduit les parties élevées à une partie de leur hauteur, jusqu'au contour (18) produisant l'espacement minimisé souhaité vers les surfaces du flanc du rotor s'engrenant. On peut remplir les creux situés entre les parties élevées (19) avec un matériau céramique, polymère ou métallique. Comme application alternative sur des engrenages de précision, on réduit de façon analogue l'espacement entre les dents (15, 16).
PCT/SE1991/000829 1990-12-05 1991-12-04 Procede de fabrication de rotors s'engrenant ou d'engrenages de precision, par usinage d'un flanc calibre au moyen d'un outil en forme de partie roulante et engrenages fabriques au moyen dudit procede WO1992010322A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9003864-7 1990-12-05
SE9003864A SE467864B (sv) 1990-12-05 1990-12-05 Foerfarande foer tillverkning av samverkande rotorer och precisionskugghjul, daer en moenstrad flank bearbetas av en verktygsrotor, samt rotorer framstaellda enligt foerfarandet

Publications (1)

Publication Number Publication Date
WO1992010322A1 true WO1992010322A1 (fr) 1992-06-25

Family

ID=20381095

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000829 WO1992010322A1 (fr) 1990-12-05 1991-12-04 Procede de fabrication de rotors s'engrenant ou d'engrenages de precision, par usinage d'un flanc calibre au moyen d'un outil en forme de partie roulante et engrenages fabriques au moyen dudit procede

Country Status (2)

Country Link
SE (1) SE467864B (fr)
WO (1) WO1992010322A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016701A5 (fr) * 2003-01-15 2007-05-08 Hitachi Ind Co Ltd Compresseur a vis et procede de fabrication de rotors adequats.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424373A (en) * 1966-10-28 1969-01-28 John W Gardner Variable lead compressor
DE3831337A1 (de) * 1988-02-25 1989-09-07 Volkswagen Ag Verfahren zum herstellen einer aus zwei miteinander im eingriff befindlichen bauteilen bestehenden maschine, insbesondere einer nach dem spiralprinzip arbeitenden verdraengermaschine
EP0378009A2 (fr) * 1989-01-10 1990-07-18 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Rotors pour compresseur à vis

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424373A (en) * 1966-10-28 1969-01-28 John W Gardner Variable lead compressor
DE3831337A1 (de) * 1988-02-25 1989-09-07 Volkswagen Ag Verfahren zum herstellen einer aus zwei miteinander im eingriff befindlichen bauteilen bestehenden maschine, insbesondere einer nach dem spiralprinzip arbeitenden verdraengermaschine
EP0378009A2 (fr) * 1989-01-10 1990-07-18 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Rotors pour compresseur à vis

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 7, No. 269, M259; & JP,A,58 148 292, 03-09-1983, (HITACHI SEISAKUSHO K.K.). *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016701A5 (fr) * 2003-01-15 2007-05-08 Hitachi Ind Co Ltd Compresseur a vis et procede de fabrication de rotors adequats.

Also Published As

Publication number Publication date
SE9003864L (sv) 1992-06-06
SE9003864D0 (sv) 1990-12-05
SE467864B (sv) 1992-09-28

Similar Documents

Publication Publication Date Title
US5364250A (en) Oil-free screw compressor and method of manufacture
CA1133958A (fr) Dispositif d'etancheisation adaptatif pour machine a volutes, et machine garnie dudit dispositif
US6540637B2 (en) Toothed rotor set
US4435139A (en) Screw rotor machine and rotor profile therefor
KR20120140659A (ko) 스크류 머신의 윤활 처리
EP0158514B1 (fr) Rotors hélicoidaux
EP0174081B1 (fr) Compresseur ou machine à expansion à rotors hélicoidaux
DE10208408A1 (de) Zahnradverzahnung
US4695233A (en) Screw rotor mechanism
JP2006214352A (ja) 螺旋状回転子機械
CA2189212C (fr) Machine a compression/expansion de fluide munie d'un rotor principal cannele avec encoches superficielles reglees, et mode de fabrication
EP2852763B1 (fr) Machines à vis à bruit réduit
WO1992010322A1 (fr) Procede de fabrication de rotors s'engrenant ou d'engrenages de precision, par usinage d'un flanc calibre au moyen d'un outil en forme de partie roulante et engrenages fabriques au moyen dudit procede
CN1127624C (zh) 一对共同工作的螺旋转子、一个螺旋转子和一旋转的螺旋机构
US4053263A (en) Screw rotor machine rotors and method of making
KR900000110B1 (ko) 스크루 로우터 회전기계
US4109362A (en) Method of making screw rotor machine rotors
US3932077A (en) Rotary interengaging worm and worm wheel with specific tooth shape
US4492546A (en) Rotor tooth form for a screw rotor machine
EP1008755B1 (fr) Machine à rotors à vis
EP1261806A1 (fr) Ensemble rotor a denture inverse
EP0961009B1 (fr) Profil de rotor à vis conjugué
JPS6134301A (ja) スクリユ−ロ−タ機
US5451150A (en) Sickleless internal gear pump with cross-sectionally mushroom-shaped sealing elements inserted in the tooth head
US4445831A (en) Screw rotor machine rotors and method of making

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU MC NL SE

122 Ep: pct application non-entry in european phase