WO1997047893A1 - Dispositif de fixation d'un rotor sur un arbre d'entrainement - Google Patents

Dispositif de fixation d'un rotor sur un arbre d'entrainement Download PDF

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Publication number
WO1997047893A1
WO1997047893A1 PCT/EP1997/002934 EP9702934W WO9747893A1 WO 1997047893 A1 WO1997047893 A1 WO 1997047893A1 EP 9702934 W EP9702934 W EP 9702934W WO 9747893 A1 WO9747893 A1 WO 9747893A1
Authority
WO
WIPO (PCT)
Prior art keywords
collet
drive shaft
rotor
conical
spring arrangement
Prior art date
Application number
PCT/EP1997/002934
Other languages
German (de)
English (en)
Inventor
Frank Eigemeier
Original Assignee
Heraeus Instruments Gmbh & Co. Kg
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 Heraeus Instruments Gmbh & Co. Kg filed Critical Heraeus Instruments Gmbh & Co. Kg
Priority to EP97925053A priority Critical patent/EP0845086A1/fr
Publication of WO1997047893A1 publication Critical patent/WO1997047893A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
    • F16D1/093—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping
    • F16D1/097—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping with clamping effected by ring expansion only, e.g. with an expanded ring located between hub and shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes
    • B04B2009/085—Locking means between drive shaft and rotor

Definitions

  • the invention relates to a device for fixing a rotor to a drive shaft, which is connected to a motor, the end of the drive shaft facing away from the motor and intended for receiving the rotor being conical, with a collet which is essentially rotationally symmetrical and is arranged around the conical end of the drive shaft and is slotted axially parallel, beginning in each case from one end of the collet, the inside of the collet being conical and the conical shape corresponding to the shape of the cone of the drive shaft and the outside of the collet essentially is cylindrical and has a stop surface formed perpendicular to the axis of rotation of the collet at the end of the collet remote from the motor end for non-positive connection with a clamping screw engaging in an axial bore of the drive shaft
  • Such devices are widely known in technology, for example in machine tool construction or also in centrifuges, such fixation arrangements are used.
  • centrifuges these arrangements serve as rotor receptacles for fastening a centrifuge rotor in order to create a firm but easily detachable connection between the rotor hub and drive unit
  • a device is known, for example, from DE G 75 41 370.
  • a collet is used to fasten the rotor of a laboratory centrifuge.
  • the components to be connected often have high temperature differences during assembly, since the drive shaft may be present has overheated, on the other hand, the rotor has been pre-cooled. After the temperature has been equalized and a temperature equilibrium has been set, so-called changes in fit occur due to changes in length due to the equalization of temperature differences
  • Collets are known from the prior art, for example from JP-62-46021 (A). However, the collet disclosed here does not have a slotted structure, but rather is pressed onto a cone under thermal expansion. Such arrangements are used, inter alia, in machine tools for holding of tools Collets are also known from WO-89/11598.
  • the collets disclosed in this publication are suitable for rotary joints, pistons, piston rods, etc. Similar collets are also known from DE-GM 72 22 304. Collets with slotted structures are from DE 29 44 756 A1 and NO-PS 94 242 known
  • This object is achieved according to the invention in that a spring arrangement which can be compressed in the axial direction is arranged between the stop surface and the screw head of the tensioning screw and in that a friction element which increases the friction is arranged between the axial stop and (replaceable) rotor.
  • a spring arrangement which can be compressed in the axial direction is arranged between the stop surface and the screw head of the tensioning screw and in that a friction element which increases the friction is arranged between the axial stop and (replaceable) rotor.
  • the friction element can be any material that increases the friction between the rotor and the drive educated.
  • the friction element is advantageously arranged in a ring around the rotor axis in order to bring about a uniform distribution of the friction force.
  • the friction element can be fixed in a groove or in another way, for example by gluing.
  • the tensioning screw may have a guide shaft for guiding the spring arrangement and for self-guidance, in particular for the guide shaft to be guided in a fit in a central bore of the drive shaft. Since the clamping system is to be operated at very high speeds, it is important that all parts are guided precisely and without imbalance.
  • the guide shaft of the clamping screw which can be arranged between the screw head and the thread, the clamping screw itself are guided in the central bore of the drive shaft, the spring elements and a thrust washer advantageously arranged between the stop surface and the spring arrangement. Since the collet is slotted, the contact surface for the spring elements on the collet is interrupted. In order to avoid wear at this point during the tensioning movement, a thrust washer or washer can be used as an intermediate layer.
  • the conical end of the drive shaft can have at its end facing the spring arrangement a stop arranged perpendicular to its axis for the spring arrangement or the thrust washer.
  • This stop serves as an overload limitation, so that the collet cannot be damaged, for example, when the clamping screw is tightened without a rotor.
  • the distance between the spring arrangement or the thrust washer and the stop must be dimensioned so that the clamping path is limited. This distance can easily be determined and optimized with just a few tests.
  • the screw head of the clamping screw has a collar which is angled around its outer edge in the direction of the drive shaft, the angled part engaging around the collet at one end.
  • Such speeds can occur, for example, if, for example, a laboratory centrifuge is started without a rotor and the centrifuge has no protective device which prevents such operation.
  • the spring arrangement is designed as a plate spring set formed from at least one plate spring or as a coil spring.
  • the collet has, at its end facing away from the motor, a cylinder sleeve on the abutment surface, in which the screw head is at least partially arranged, the screw head having a collar on its outer circumference and the cylinder sleeve inwards Axis directed edge has, which engages around the collar of the screw head on the side facing away from the spring arrangement and abuts the collar.
  • the clamping screw acts as a puller when it is unscrewed from the drive shaft and releases the collet from the drive shaft even when the fit is very tight.
  • the slots of the collet alternate, i.e. H. alternately starting from the two end faces of the collet. This makes it possible to strongly deform the collet to insert the clamping screw, the spring arrangement and the thrust washer from above until the spring arrangement and the collar are arranged in the annular groove formed by the space between the inwardly directed edge and the stop surface.
  • the alternating (meandering) arrangement of the slots leads to a high flexibility of the collet.
  • the collet can only be slotted from the side facing the motor.
  • the inward edge of the collet designed to bear against the collar of the screw head is detachably arranged on the conical part of the collet.
  • the device can be used for a centrifuge.
  • FIG. 1 shows a schematic sectional illustration of the device
  • FIG. 2 shows a schematic illustration of the collet
  • FIG. 3 shows a half section of the device
  • Figure 4 is a half-sectional view of a second embodiment
  • Figure 5 is a collet for the second embodiment.
  • the drawing shows a section through the device according to the invention with a centrifuge rotor 1 which is placed on a collet 2.
  • the collet 2 in turn is placed on the conical part 3 of the drive shaft 4.
  • the lower end of the rotor 1 rests on an axial stop 5 which delimits the conical part 3 of the drive shaft 4.
  • a rubber ring 15 is arranged as a friction element in a groove of the axial stop 5 which extends circularly around the axis of the drive shaft 4.
  • the collet 2 is formed from a spring steel. It is meandering, i.e. H. alternately slotted from above and below, the slits 6 being only indicated in FIG. 1. They open at their end located within the collet 2 into a bore 7 which, when the collet 2 expands, distributes forces and thus prevent the slots 6 from being torn out (FIG. 2).
  • the collet 2 has in its upper area as a cylindrical sleeve a groove 8 (e.g. an annular groove) which is formed between the stop surface 9 and the inwardly facing edge 10.
  • a thrust washer 16 On the stop surface 9 is a thrust washer 16 and on this the disc spring set 1 1, which braces the clamping screw 12 against the collet 2 self-adjusting.
  • the clamping screw 12 has a collar 13 on its outer circumference.
  • the disc springs 11 rest on the lower side of the collar 13, while the upper side of the collar 13 presses against the edge 10 of the clamping screw 2 when the clamping screw 12 is unscrewed from the drive shaft 4 and thereby pulls it off the conical part of the drive shaft 4 .
  • the clamping screw 12 can be reached through a central bore 14 of the rotor 1 and has a guide shaft 17 which is arranged between the screw head and the thread and which is guided in a fit in a central bore of the drive shaft 4.
  • the guide shaft 17 also serves to guide the plate spring set 11 and the thrust washer 16.
  • the conical end of the drive shaft 4 has, at its end facing the plate spring set 11, a stop 18 arranged perpendicular to its axis, which in the loosened state of the rotor is at a short distance from the plane of the stop surface 9 and when the clamping screw 12 is tightened without a rotor forms an overload limitation by abutment against the thrust washer 16.
  • a further embodiment of the collet 2 is designed such that the slots 6 only extend from the lower edge.
  • Figures 4 and 5 show a further embodiment of the invention.
  • the screw head of the clamping screw 12 ' has a collar 13' which on its outer edge in the direction of the drive shaft 4 has a circumferential, angled part 19 which engages around the collet 2 'at its upper end.
  • the edge 20 of the angled part 19 is cranked inwards and engages in a groove 21 which is formed on the outside of the collet 2 ', all the way round.
  • This arrangement secures the collet 2 'and prevents it from being destroyed by overstretching if the device is operated accidentally (which is possible with centrifuges without rotor detection) without rotor 1

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)

Abstract

L'invention concerne un dispositif de fixation d'un rotor (1) sur un arbre d'entraînement (4) raccordé à un moteur, l'extrémité (3) de l'arbre d'entraînement (4), opposée au moteur et servant à loger le rotor (1) étant conique. Ledit dispositif comprend un pince de serrage (2) essentiellement à symétrie de révolution, placée autour de l'extrémité conique (3) de l'arbre d'entraînement (4) et fendue (6) à partir d'une face de la pince (2) de façon parallèle à l'axe de l'arbre. La face intérieure de la pince de serrage (2) présente une forme conique correspondant à la forme du cône (3) de l'arbre d'entraînement (4). La face extérieure de la pince de serrage (2) est essentiellement cylindrique et présente, au niveau de l'extrémité de la pince (2) opposée au moteur, une surface d'arrêt (9) perpendiculaire à l'axe de rotation de la pince de serrage (2) pour créer une liaison de force avec une vis de serrage (12) pénétrant dans le trou axial de l'arbre d'entraînement (4). En vue d'assurer une fixation sûre du rotor (1) sur l'arbre d'entraînement (4), même après des fluctuations de température des composants, ou après une compensation de température des composants soumis à de grands écarts thermiques lors du montage, il est prévu de placer un ensemble ressort (11) pouvant être comprimé dans le sens axial, entre la surface d'arrêt (9) et la tête de la vis de serrage (12), ainsi qu'un élément de friction (15) entre la butée axiale (5) et le rotor (1).
PCT/EP1997/002934 1996-06-14 1997-06-06 Dispositif de fixation d'un rotor sur un arbre d'entrainement WO1997047893A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97925053A EP0845086A1 (fr) 1996-06-14 1997-06-06 Dispositif de fixation d'un rotor sur un arbre d'entrainement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19623684 1996-06-14
DE19623684.3 1996-06-14

Publications (1)

Publication Number Publication Date
WO1997047893A1 true WO1997047893A1 (fr) 1997-12-18

Family

ID=7796899

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/002934 WO1997047893A1 (fr) 1996-06-14 1997-06-06 Dispositif de fixation d'un rotor sur un arbre d'entrainement

Country Status (4)

Country Link
EP (1) EP0845086A1 (fr)
CA (1) CA2229377A1 (fr)
DE (1) DE19721335C2 (fr)
WO (1) WO1997047893A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19947465A1 (de) * 1999-10-02 2001-04-05 Ksb Ag Wellen-Naben-Verbindung
AT502091B1 (de) * 2003-03-13 2008-11-15 Eurocopter France Kupplungsflanschsystem für hohlwelle
US10532366B2 (en) * 2016-07-13 2020-01-14 Kubota Manufacturing Corporation Rotor attachment structure and centrifuge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012011531B4 (de) 2012-06-08 2016-11-10 Thermo Electron Led Gmbh Set aus Antriebskopf und Nabe zur lösbaren Verbindung eines Antriebes mit einem Rotor einer Zentrifuge für einen weiten Drehzahlbereich

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR645181A (fr) * 1927-12-05 1928-10-20 Essoreuse
FR850824A (fr) * 1939-02-24 1939-12-27 Dispositif pour la fixation de pièces sur des arbres, axes, ou autres supports
US2574773A (en) * 1945-08-21 1951-11-13 Nat Tube Co Roll mounting
DE2611610A1 (de) * 1976-03-19 1977-09-29 Steller Gmbh Co Kg Fritz Foerderbandtrommel
EP0007217A1 (fr) * 1978-07-10 1980-01-23 Harrington Hoists, Inc. Dispositif de montage
DE8411110U1 (de) * 1984-04-09 1985-08-08 Kark, Uwe, 2104 Hamburg Walzvorrichtung, bestehend aus einer Walzenwelle, einem Walzenring und einer Konushülse
DE3607505C1 (de) * 1986-03-07 1987-05-14 Heraeus Separationstechnik Gmb Zentrifuge
DE3615985A1 (de) * 1986-05-13 1987-11-19 Overbeck Gmbh & Co Vorrichtung zum abstoppen einer achse oder dergleichen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7222304U (de) * 1972-09-07 Peter Oskar Spannsatz zur Nabenbefestigung
US4367053A (en) * 1978-11-06 1983-01-04 Andrew Stratienko Clamping device
SE463225B (sv) * 1988-05-25 1990-10-22 Roger Svensson Anordning vid expanderfaeste
JP2691497B2 (ja) * 1993-02-27 1997-12-17 マルマンゴルフ株式会社 ゴルフクラブヘツドの製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR645181A (fr) * 1927-12-05 1928-10-20 Essoreuse
FR850824A (fr) * 1939-02-24 1939-12-27 Dispositif pour la fixation de pièces sur des arbres, axes, ou autres supports
US2574773A (en) * 1945-08-21 1951-11-13 Nat Tube Co Roll mounting
DE2611610A1 (de) * 1976-03-19 1977-09-29 Steller Gmbh Co Kg Fritz Foerderbandtrommel
EP0007217A1 (fr) * 1978-07-10 1980-01-23 Harrington Hoists, Inc. Dispositif de montage
DE8411110U1 (de) * 1984-04-09 1985-08-08 Kark, Uwe, 2104 Hamburg Walzvorrichtung, bestehend aus einer Walzenwelle, einem Walzenring und einer Konushülse
DE3607505C1 (de) * 1986-03-07 1987-05-14 Heraeus Separationstechnik Gmb Zentrifuge
DE3615985A1 (de) * 1986-05-13 1987-11-19 Overbeck Gmbh & Co Vorrichtung zum abstoppen einer achse oder dergleichen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19947465A1 (de) * 1999-10-02 2001-04-05 Ksb Ag Wellen-Naben-Verbindung
AT502091B1 (de) * 2003-03-13 2008-11-15 Eurocopter France Kupplungsflanschsystem für hohlwelle
US10532366B2 (en) * 2016-07-13 2020-01-14 Kubota Manufacturing Corporation Rotor attachment structure and centrifuge

Also Published As

Publication number Publication date
DE19721335A1 (de) 1997-12-18
DE19721335C2 (de) 1999-07-29
EP0845086A1 (fr) 1998-06-03
CA2229377A1 (fr) 1997-12-18

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