CA2229377A1 - Device for fixing a rotor to a drive shaft - Google Patents
Device for fixing a rotor to a drive shaft Download PDFInfo
- Publication number
- CA2229377A1 CA2229377A1 CA002229377A CA2229377A CA2229377A1 CA 2229377 A1 CA2229377 A1 CA 2229377A1 CA 002229377 A CA002229377 A CA 002229377A CA 2229377 A CA2229377 A CA 2229377A CA 2229377 A1 CA2229377 A1 CA 2229377A1
- Authority
- CA
- Canada
- Prior art keywords
- collet chuck
- drive shaft
- fact
- rotor
- springs
- 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.)
- Abandoned
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Centrifugal Separators (AREA)
Abstract
The invention relates to a device for fixing a rotor (1) to a drive shaft (4) which is connected to a motor, the drive-shaft (4) end (3) turned away from the motor and provided for holding the rotor (1) being conical. Said device has a spring chuck (2) which is substantially rotationally symmetrical, and is arranged around the conical end (3) of the drive shaft (4), and is slotted parallel to the axis starting in each case from one end surface of the spring chuck (2). The inside of the spring chuck (2) is conical and the conical shape corresponds to the shape of the cone (3) of the drive shaft (4), and the outside of the spring chuck (2) is substantially cylindrical, and has a stop surface (9) perpendicular to the axis of rotation of the spring chuck (2) on the spring chuck (2) end turned away from the motor, for frictional connection with a clamping screw (12) engaging in an axial bore of the drive shaft (4).
To ensure, after changes in temperature of the individual components or after temperature compensation of components which have great differences in temperature during assembly, secure fastening of the rotor (1) to the drive shaft (4) a spring arrangement (11) compressible in the axial direction is arranged between the stop surface (9) and the screw top of the clamping screw (12), and a friction element (15) is arranged between the axial stop (5) and the rotor (1).
To ensure, after changes in temperature of the individual components or after temperature compensation of components which have great differences in temperature during assembly, secure fastening of the rotor (1) to the drive shaft (4) a spring arrangement (11) compressible in the axial direction is arranged between the stop surface (9) and the screw top of the clamping screw (12), and a friction element (15) is arranged between the axial stop (5) and the rotor (1).
Description
Hanau, 6/5197 SSR/Rii/en/pO756_3 .sam Patent Application Heraeus Instrumerlts GmbH
Device for Fi~illg a Rotor on a Drive Shai~
The invention concerns a device for fixing a rotor on a drive shaft which is connected with a mot~r, the end of the drive shaft which is tumed away ~rom the motor and int~n~led to accept the roto r being conically shaped, with a collet chuck which has an essentially rotationally symmetric shaFle and which is arranged around the conical end of the drive shaft, and which has axis-parallel slits always be~ g firom one face of the collet chuck, the inside of the collet chuck being cone-shaped and the cone shape corresponding to the form of the cone of the drive shaft, and the outside of the collet chuck being essentially cylindrically shaped and having a stop surfilce on the end of the collet chuck turned away from the end of the motor, which is perFendicular to the rotational axis of the collet chuck and which is int~n~1erl to ~orm a non-positive cormection with a tension screw ~n~?~gin~ in an axial hole of the drive shaft.
Many such devices are known in sLaLe of the art. For example, such fixing arrangements are used in rnachine tool construction and also in centrifuges. In centrifuges these arran~ Ls serve as the r otor holder to fasten a c~-ntrif~lge rotor, in order to provide a firm but easily removable connection bet~heen the rotor hub and the drive unit. For exarnple, such a device is known from DE G 75 41 370 In this patent a collet chuclc is used to attach the rotor of a ldl~ dL ~ly centri-fuge. In laboratory technique, the components to be cormccted with one another (drive and rotor) frequently have high Lc~ p~ldLu~ differences during assembly, since under certain c~ ces the drive shaft can run hot, while on the other side the rotor is cooled. After the temperature has equalized and a t~ al~lre equilibrium has been established, so-called changes in fitting play arise due to length changes caused by the eql~li7~tinll of the tempcrature differences. This can lead to the loss of pretension, and thus loosen the corulection.
ColL~t chucks are known from the state o~the art, for e~arnple from JP-6246021 (A). However, the c:ollet chuck disclosed here does not have a slit stmcture, but rather it is pressed onto a cone under expansion caused by heat. Such ~~ lLs are used in m~hine tools to hold tools, among other places. Collet chucks are also known from W0-89/11598. The collet chucks dis-closed in this publication are suitable for turniug knuckles, pistons, piston rods, etc. Similar col-let chucks are known from DE-GM 72 22 304. Collet chucks with slit structures are known from DE :~9 44 756 A1 and N0-PS 94 242.
The task of this invention is, starting from the known state of the art, to produce a device of this type which securely fastens the rotor onto a drive shaft, even after a change in k;.~ .dLure of the individu~l components, or after the te~ dLuLe equalizdtion of ~Glllpunc~ which have high t~ ,cldture differences during assembly.
This task is solved according to the invention by arranging springs, which can be pressed together in the axial direction, between the stop surfa~e and the head of the tension screw, and by arra3lging a friction-increasing friction element between the stûp surface and (~ ble) rotor. This ensures that the collet chuck lies firrnly on the cone of the drive shaft and thus that there is a non-positive cc,lllle~.lion between the collect chuck and the rotor, even if ~3~. .dL~-dependent changes occur in length of the involved colllyvl~ , since the springs coll .3~ L~ a fitting play which might be caused by chan~es m lengbl. Furtht;~ ol~, this facilitates simple and secl ~e ~ hment of the rotor, for example that of a laboratory c~ ; r.-~e, since the friction element ensures that the drive with the clamping system does not rotate away under the rotor when the tension screw is tightened, but rather actually spreads the collet chuck, without the operator having to press the parts specially against olle ar otl1er. The friction çlem~nt can be made of any material inw~ g the friction b~;L~ CI1 the rotor arLd tJle drive, but it is preferable if it is an elastic m~t~ l, especially rubber. It is advantageûus if the 3friction element is a~anged around the rotor axis in the shape of a ring, so as tû distributc the frictional force u~ lly. The friction ' . CA 02229377 1998-02-12 elernent can be fixed in a groove or another way, for exaTnple gluing lt can be expedient for the tension screw to have a guide shaft to guide the spr~ngs and to locate *sel~, espccially for the guide shaft to be fitted in a central hole of the drive shaft. Since the clamping system is intcnrle~l to bc operated at very high rpm, it is ~ )U~ l that all parts be held exactly and not be out of balance. The guide shaf't of the tension screw, which c~n be arranged I~CLVV~G1I thc head of ~he screw and the thread, holds the tension screw itself in the central hole of the drive shaft, thc spring elements, and a ~L~uLe washer, which is advantageously arranged l)CLVICCI1 the stop surface and the springs. Since the collet chuck has slits, the supporting surface for the spring elements on the collet chuck is lllle~lu~l~d ~n order to prevent wear on this place during the clamping motion, a ~It;S~ vasher or a plain washer can be used as an interrnediate layer.
The conical cnd of the drive shaft can have, on its end ~oward the springs, a stop for the springs or the ~lCS~ washer aIranged perpendicular to its axis. This stop is an overload limit, so that, for e xample, the collet chuck cannot be damaged if tlhe tension screw is tightened without a rotor.
For this purposc the distance between the springs or the L lC~Sulc washer and the stop should be dim-nsioned in such a way that the clamping travel is limited. This distance can easily be determined and optimized by small tests.
In a special embûdiment of the invention it is expedient for the head o~ the tension screw to have a collar whose outer edgc has a U-bend around its perimeter in the direction of the drive shaft, the bent part en~ es the collet chuck on one end. This li nits the radial expansion of the coll,-t chuck, so that, for example, if the rotor is accidentally operated without a rotor, the collet chuck is not ov~lallel~;hed by the centrifugal forccs this produces. Such speeds can be produced by, ~nong other things, starting a laboratory ce~ifi~ge without a rotor, if the centrifuge does not have a plu~e~:Live device to prevent such operation7 ~or example.
An ~dvantageous embodiment of the invention uses a set of spring washers consisting of at least , t 1:
. CA 02229377 1998-02-12 one spring washer or a coil spring for the springs. In another embodiment, it is more expedicnt for the collet chuck to have a cylindrical housing, which is ~ n~ to the stop sur~ace on its end turned away from the motor, and in which thc screw head is at least partially ~ d, the screw heacL having a collar on its outer perimeter and the cylindrical housing having an cdge aimed inward, to~,vard the axis, which encompasses the collar of the screw head on the side which is turned away from the springs and which is intended to lie against the collar. This makes the tension screw act as an extractor when it is ~nscrcwed from the drive shaft, and loosens the collet chuek from the drive shafl, even if it is seated very securely.
It is expedient for the slits of the collet chuck to start from ~It~ te faces of the collet chuck.
This makes it possible, among other things, to defor~ the collet chuck ah~ ly to introduce the tension screw, the springs, and the ~L~:jUle washer from above, until the springs and the collar are .arranged in the ring-shaped groove formed by thc space b~lwt;~ll the inward-a~ned edge and the stop surface. In general, the slits' ;llt~rn~ting arrangement (shaped like a Greek key pattern) procluces very great flexibi~ity in the collet chuck.
In allother embodiment the collet chuck can have a slit only on the side tumed toward the rnotor.
In o~der to fo~n the above-m~nti- n~d ring-shaped groove to hold the collar of the screw head and the springs, the inward-aimed edge of the collet chuck which is shaped to rest against the coll;~r of the screw head is arranged in a ~1~t~rh~hle rnanner on thc conical part of the collet chuck. The collet chucic is set on the cone of the drive shaft and the tension screw is screwed into the drive shaft, and then the inward-aimcd cdge of the collet chuck is fastened on it.
The dcvice according to the invention can be used for a centrifilge.
The invention is explained in detail below using drawings.
The drawings are as follows:
' CA 02229377 1998-02-12 Figure 1 shows a s(~hem~ic sectional view of the device;
Figl3le 2 shows a srhem~tic ~ L~lion of the collet chuck;
Figure 3 shows a half section of the device.
Figurc 4 shows a half sectional ~ s~ lion of a second embodiment of the invention, and Figl:Ic 5 shows a collet chuck for the second embodiment of the invention.
The drav~ings show a section through the device according to the invention with a centrifuge rotor 1, which is set onto a collet chuck 2. The collet chuck 2 in twn is set on the conical part 3 of the drive shaft 4. There is a no~-positive connection between the rotor 1, the collet chuck 2, and the drive shaft 4 (Figures 1 and 3).
The lower end of rotor 1 lies against an axial stop 5 which borders the conical part 3 of the drive shaft ~. A rubber ring 15 which serves as a friction clcrnent is arranged between the axial stop 5 and the rotor I in a groove of the drive shaf~ S encircling the axis of the drive shaft 4. The collet chucl~ 2 is made of a spring steel. It is shaped lilce a Greek key pattern, i.e., its slits altemate from top to bottom, the slits 6 in Figure I only bcing hinted at. Each of their ends located within the collet chucl~ 2 opens into a hole 7, which distributes the forces when the collct chuck 2 expands, and thus prevents slits 6 tearing (Figure 2).
The top area of the collet chuck 2 has a groove 8 (e.g., a ring-shaped groove) which serves as a cylindrical housing and which is formed between the stop surface 9 and the inward-aim}ng edge 10. The stop surface 9 has a ~I~S~ult; washer 16 lying on it, which in t~rn has the set of spring washers 11 lying on it, and the set of spring washers 11 braces the tension screw 12 against the collet chuclc 2 in a self-adjusting manner. The tension screw 12 has a collar 13 on its outer ~ CA 02229377 1998-02-12 perimeter. The lower side of the collar 13 has the spring washers l l pressing on it, while the top side of the coll~r 13 presses against the edge lO of the tension screw [? ~po for collet chuck ?] 2 whell the tension screw 12 is ~ s~l~vved from the drive shaft 4, and this pulls away from the con~eval part of the drive shaft 4. The tension screw lZ can be reached through a central hole 14 of the rotorl, and has a gnide shaft 17 which is aTranged h~Lw~;ell the screw head and the thread and whic;h is held in a fit of a central hole of the drive shafl 4. T_e guide shaft l 7 also serves to guide the set of spring washers l l ancl the ~ Ul~ washer 16.
The conical end of the drive shaft 4 has a stop l 8, which is arranged perpendicular to its axis on its end tumed toward the set of spring washers l l, and which is only a very small distance from the Fllane of the stop surface 9 when the rotor is loose and which forms an overload limit by lying against the L)L~ washer l 6 when the ti~ht~ning screw 12 is ~htened without a rotor.
The drawings do not show another embodiment of the invention in which the collet chuck 2 is madc in such a way that thc slits 6 start only firom the Lower edge. They can extend all the way into the area of the groove 8, so that the collet chuck can be set down onto the premounted tension screw l2 firom the top, as in the embodiment sE~own in the drawings, before the rotor 1 is set on the collet chuck 2. EIowever, this is only possible to a lirnited extent, so that another embodiment of the last-mentioned arrangement of the slits 6 consists of setting the top part of the collet chuck 2, including the edge l 0, on the lower part of the collet chuck 2 so that it is detachable by screwing. This makes it possible to ar.range the lower part of the collet chuck 2 on the conical part 3 of the drive shaft 4 first. After that, the tension screw 12 is screwed into the drive sha~t 4, and then the top part of the collet chuck 2 is set down and ;~
Figures 4 and 5 show another embodiment of the invention. In this device the screw head of the tension screw 12' has a collar 13', whose outer edge in the direction of the drive shalt 4 has a ~e~ he~ bent back part l 9 which en ;~,.l.pa~es the collet chuck 2' on its top edge. The edge 20 of the bent-back part l 9 is bent 90~ inward, and engages in a groove 2 l which is forrned on the outside of the collet chuck 2' and runs around it. This arrangement secures the colIet chuck 2' and prevents its destruction by overstretching, if the device should accidentally be put into operation without rotor I (which is possible in centrifuges without rotor detection).
Device for Fi~illg a Rotor on a Drive Shai~
The invention concerns a device for fixing a rotor on a drive shaft which is connected with a mot~r, the end of the drive shaft which is tumed away ~rom the motor and int~n~led to accept the roto r being conically shaped, with a collet chuck which has an essentially rotationally symmetric shaFle and which is arranged around the conical end of the drive shaft, and which has axis-parallel slits always be~ g firom one face of the collet chuck, the inside of the collet chuck being cone-shaped and the cone shape corresponding to the form of the cone of the drive shaft, and the outside of the collet chuck being essentially cylindrically shaped and having a stop surfilce on the end of the collet chuck turned away from the end of the motor, which is perFendicular to the rotational axis of the collet chuck and which is int~n~1erl to ~orm a non-positive cormection with a tension screw ~n~?~gin~ in an axial hole of the drive shaft.
Many such devices are known in sLaLe of the art. For example, such fixing arrangements are used in rnachine tool construction and also in centrifuges. In centrifuges these arran~ Ls serve as the r otor holder to fasten a c~-ntrif~lge rotor, in order to provide a firm but easily removable connection bet~heen the rotor hub and the drive unit. For exarnple, such a device is known from DE G 75 41 370 In this patent a collet chuclc is used to attach the rotor of a ldl~ dL ~ly centri-fuge. In laboratory technique, the components to be cormccted with one another (drive and rotor) frequently have high Lc~ p~ldLu~ differences during assembly, since under certain c~ ces the drive shaft can run hot, while on the other side the rotor is cooled. After the temperature has equalized and a t~ al~lre equilibrium has been established, so-called changes in fitting play arise due to length changes caused by the eql~li7~tinll of the tempcrature differences. This can lead to the loss of pretension, and thus loosen the corulection.
ColL~t chucks are known from the state o~the art, for e~arnple from JP-6246021 (A). However, the c:ollet chuck disclosed here does not have a slit stmcture, but rather it is pressed onto a cone under expansion caused by heat. Such ~~ lLs are used in m~hine tools to hold tools, among other places. Collet chucks are also known from W0-89/11598. The collet chucks dis-closed in this publication are suitable for turniug knuckles, pistons, piston rods, etc. Similar col-let chucks are known from DE-GM 72 22 304. Collet chucks with slit structures are known from DE :~9 44 756 A1 and N0-PS 94 242.
The task of this invention is, starting from the known state of the art, to produce a device of this type which securely fastens the rotor onto a drive shaft, even after a change in k;.~ .dLure of the individu~l components, or after the te~ dLuLe equalizdtion of ~Glllpunc~ which have high t~ ,cldture differences during assembly.
This task is solved according to the invention by arranging springs, which can be pressed together in the axial direction, between the stop surfa~e and the head of the tension screw, and by arra3lging a friction-increasing friction element between the stûp surface and (~ ble) rotor. This ensures that the collet chuck lies firrnly on the cone of the drive shaft and thus that there is a non-positive cc,lllle~.lion between the collect chuck and the rotor, even if ~3~. .dL~-dependent changes occur in length of the involved colllyvl~ , since the springs coll .3~ L~ a fitting play which might be caused by chan~es m lengbl. Furtht;~ ol~, this facilitates simple and secl ~e ~ hment of the rotor, for example that of a laboratory c~ ; r.-~e, since the friction element ensures that the drive with the clamping system does not rotate away under the rotor when the tension screw is tightened, but rather actually spreads the collet chuck, without the operator having to press the parts specially against olle ar otl1er. The friction çlem~nt can be made of any material inw~ g the friction b~;L~ CI1 the rotor arLd tJle drive, but it is preferable if it is an elastic m~t~ l, especially rubber. It is advantageûus if the 3friction element is a~anged around the rotor axis in the shape of a ring, so as tû distributc the frictional force u~ lly. The friction ' . CA 02229377 1998-02-12 elernent can be fixed in a groove or another way, for exaTnple gluing lt can be expedient for the tension screw to have a guide shaft to guide the spr~ngs and to locate *sel~, espccially for the guide shaft to be fitted in a central hole of the drive shaft. Since the clamping system is intcnrle~l to bc operated at very high rpm, it is ~ )U~ l that all parts be held exactly and not be out of balance. The guide shaf't of the tension screw, which c~n be arranged I~CLVV~G1I thc head of ~he screw and the thread, holds the tension screw itself in the central hole of the drive shaft, thc spring elements, and a ~L~uLe washer, which is advantageously arranged l)CLVICCI1 the stop surface and the springs. Since the collet chuck has slits, the supporting surface for the spring elements on the collet chuck is lllle~lu~l~d ~n order to prevent wear on this place during the clamping motion, a ~It;S~ vasher or a plain washer can be used as an interrnediate layer.
The conical cnd of the drive shaft can have, on its end ~oward the springs, a stop for the springs or the ~lCS~ washer aIranged perpendicular to its axis. This stop is an overload limit, so that, for e xample, the collet chuck cannot be damaged if tlhe tension screw is tightened without a rotor.
For this purposc the distance between the springs or the L lC~Sulc washer and the stop should be dim-nsioned in such a way that the clamping travel is limited. This distance can easily be determined and optimized by small tests.
In a special embûdiment of the invention it is expedient for the head o~ the tension screw to have a collar whose outer edgc has a U-bend around its perimeter in the direction of the drive shaft, the bent part en~ es the collet chuck on one end. This li nits the radial expansion of the coll,-t chuck, so that, for example, if the rotor is accidentally operated without a rotor, the collet chuck is not ov~lallel~;hed by the centrifugal forccs this produces. Such speeds can be produced by, ~nong other things, starting a laboratory ce~ifi~ge without a rotor, if the centrifuge does not have a plu~e~:Live device to prevent such operation7 ~or example.
An ~dvantageous embodiment of the invention uses a set of spring washers consisting of at least , t 1:
. CA 02229377 1998-02-12 one spring washer or a coil spring for the springs. In another embodiment, it is more expedicnt for the collet chuck to have a cylindrical housing, which is ~ n~ to the stop sur~ace on its end turned away from the motor, and in which thc screw head is at least partially ~ d, the screw heacL having a collar on its outer perimeter and the cylindrical housing having an cdge aimed inward, to~,vard the axis, which encompasses the collar of the screw head on the side which is turned away from the springs and which is intended to lie against the collar. This makes the tension screw act as an extractor when it is ~nscrcwed from the drive shaft, and loosens the collet chuek from the drive shafl, even if it is seated very securely.
It is expedient for the slits of the collet chuck to start from ~It~ te faces of the collet chuck.
This makes it possible, among other things, to defor~ the collet chuck ah~ ly to introduce the tension screw, the springs, and the ~L~:jUle washer from above, until the springs and the collar are .arranged in the ring-shaped groove formed by thc space b~lwt;~ll the inward-a~ned edge and the stop surface. In general, the slits' ;llt~rn~ting arrangement (shaped like a Greek key pattern) procluces very great flexibi~ity in the collet chuck.
In allother embodiment the collet chuck can have a slit only on the side tumed toward the rnotor.
In o~der to fo~n the above-m~nti- n~d ring-shaped groove to hold the collar of the screw head and the springs, the inward-aimed edge of the collet chuck which is shaped to rest against the coll;~r of the screw head is arranged in a ~1~t~rh~hle rnanner on thc conical part of the collet chuck. The collet chucic is set on the cone of the drive shaft and the tension screw is screwed into the drive shaft, and then the inward-aimcd cdge of the collet chuck is fastened on it.
The dcvice according to the invention can be used for a centrifilge.
The invention is explained in detail below using drawings.
The drawings are as follows:
' CA 02229377 1998-02-12 Figure 1 shows a s(~hem~ic sectional view of the device;
Figl3le 2 shows a srhem~tic ~ L~lion of the collet chuck;
Figure 3 shows a half section of the device.
Figurc 4 shows a half sectional ~ s~ lion of a second embodiment of the invention, and Figl:Ic 5 shows a collet chuck for the second embodiment of the invention.
The drav~ings show a section through the device according to the invention with a centrifuge rotor 1, which is set onto a collet chuck 2. The collet chuck 2 in twn is set on the conical part 3 of the drive shaft 4. There is a no~-positive connection between the rotor 1, the collet chuck 2, and the drive shaft 4 (Figures 1 and 3).
The lower end of rotor 1 lies against an axial stop 5 which borders the conical part 3 of the drive shaft ~. A rubber ring 15 which serves as a friction clcrnent is arranged between the axial stop 5 and the rotor I in a groove of the drive shaf~ S encircling the axis of the drive shaft 4. The collet chucl~ 2 is made of a spring steel. It is shaped lilce a Greek key pattern, i.e., its slits altemate from top to bottom, the slits 6 in Figure I only bcing hinted at. Each of their ends located within the collet chucl~ 2 opens into a hole 7, which distributes the forces when the collct chuck 2 expands, and thus prevents slits 6 tearing (Figure 2).
The top area of the collet chuck 2 has a groove 8 (e.g., a ring-shaped groove) which serves as a cylindrical housing and which is formed between the stop surface 9 and the inward-aim}ng edge 10. The stop surface 9 has a ~I~S~ult; washer 16 lying on it, which in t~rn has the set of spring washers 11 lying on it, and the set of spring washers 11 braces the tension screw 12 against the collet chuclc 2 in a self-adjusting manner. The tension screw 12 has a collar 13 on its outer ~ CA 02229377 1998-02-12 perimeter. The lower side of the collar 13 has the spring washers l l pressing on it, while the top side of the coll~r 13 presses against the edge lO of the tension screw [? ~po for collet chuck ?] 2 whell the tension screw 12 is ~ s~l~vved from the drive shaft 4, and this pulls away from the con~eval part of the drive shaft 4. The tension screw lZ can be reached through a central hole 14 of the rotorl, and has a gnide shaft 17 which is aTranged h~Lw~;ell the screw head and the thread and whic;h is held in a fit of a central hole of the drive shafl 4. T_e guide shaft l 7 also serves to guide the set of spring washers l l ancl the ~ Ul~ washer 16.
The conical end of the drive shaft 4 has a stop l 8, which is arranged perpendicular to its axis on its end tumed toward the set of spring washers l l, and which is only a very small distance from the Fllane of the stop surface 9 when the rotor is loose and which forms an overload limit by lying against the L)L~ washer l 6 when the ti~ht~ning screw 12 is ~htened without a rotor.
The drawings do not show another embodiment of the invention in which the collet chuck 2 is madc in such a way that thc slits 6 start only firom the Lower edge. They can extend all the way into the area of the groove 8, so that the collet chuck can be set down onto the premounted tension screw l2 firom the top, as in the embodiment sE~own in the drawings, before the rotor 1 is set on the collet chuck 2. EIowever, this is only possible to a lirnited extent, so that another embodiment of the last-mentioned arrangement of the slits 6 consists of setting the top part of the collet chuck 2, including the edge l 0, on the lower part of the collet chuck 2 so that it is detachable by screwing. This makes it possible to ar.range the lower part of the collet chuck 2 on the conical part 3 of the drive shaft 4 first. After that, the tension screw 12 is screwed into the drive sha~t 4, and then the top part of the collet chuck 2 is set down and ;~
Figures 4 and 5 show another embodiment of the invention. In this device the screw head of the tension screw 12' has a collar 13', whose outer edge in the direction of the drive shalt 4 has a ~e~ he~ bent back part l 9 which en ;~,.l.pa~es the collet chuck 2' on its top edge. The edge 20 of the bent-back part l 9 is bent 90~ inward, and engages in a groove 2 l which is forrned on the outside of the collet chuck 2' and runs around it. This arrangement secures the colIet chuck 2' and prevents its destruction by overstretching, if the device should accidentally be put into operation without rotor I (which is possible in centrifuges without rotor detection).
Claims (14)
1. Device for fixing a rotor on a drive shaft, which is connected with a motor, the end of the drive shaft which is turned away from the motor and which is intended to accept the rotor being conically shaped, with a collet chuck which has an essentially rotationally symmetric shape and which is arranged around the conical end of the drive shaft, and which has axis-parallel slits always beginning from one face of the collet chuck, the inside of the collet chuck being cone-shaped and the cone shape corresponding to the form of the cone of the drive shaft, and the outside of the collet chuck being essentially cylindrically shaped and having a stop surface on the end of the collet chuck turned away from the end of the motor, which is perpendicular to the rotational axis of the collet chuck and which is intended to form a non-positive connection with a tension screw engaging in an axial hole of the drive shaft, characterized by the fact that springs (11) pressing together in the axial direction are arranged between the stop surface (9) and the head of the tension screw (12), and that a friction element (15) is arranged between the axial stop (5) and the rotor (1).
2. Device according to Claim 1, characterized by the fact that the friction element (15) is made of an elastic material, especially of rubber.
3. Device according to Claims 1 or 2, characterized by the fact that the friction element (15) is arranged around the rotor axis in the shape of a ring.
4 Device according to one of Claims 1 through 3, characterized by the fact that the friction element (15) is fixed in a groove.
5. Device according to one of Claims 1 through 4, characterized by the fact that the tension screw (12) has a guide shaft (17) to guide the springs (11) and to locate itself.
6. Device according to Claim 5, characterized by the fact that the guide shaft (17) is held in a fit of a central hole in the drive shaft (4).
7. Device according to one of Claims 1 through 6, characterized by the fact that a pressure washer (16) is arranged between the stop surface (9) and the springs (11).
8. Device according to one of Claims 1 through 7, characterized by the fact that the conical end of the drive shaft (4), on its end turned toward the springs (11), has a stop (18) for the springs (11) or the pressure washer (16), which is arranged perpendicular to its axis.
9. Device according to one of Claims 1 through 8, characterized by the fact that the springs (11) are in the form of a coil spring or of a set of spring washers consisting of at least one spring washer.
10. Device according to one of Claims 1 through 9, characterized by the fact that the slits (6) of the collet chuck (2) start from alternate faces of the collet chuck (2).
11. Device according to one of Claims 1 through 9, characterized by the fact that head of the tension screw (12') has a collar (13') which has a peripheral U-bend on its outer edge in the direction of the drive shaft, the bent-back part (19) encompassing the collet chuck (2') on one end.
12. Device according to one of Claims 1 through 10, characterized by the fact that the end of the collet chuck (2) turned away from the motor has a cylindrical housing, which is adjacent to the stop surface (9), and in which the screw head is at least partially arranged, the outer periphery of the screw head having a collar (13), and the cylindrical housing having an edge (10) aimed inward, toward the axis, which encompasses the collar (13) of the screw head on the side turned away from the springs (11) and which is intended to lie against the collar (13).
13. Device according to Claim 12, characterized by the fact that the slits (6) of the collet chuck (2) start from the side of the collet chuck (2) turned toward the motor and that the inward-aiming edge (10) of the collet chuck (2) made to lie against the collar (13) of the screw head is arranged in a detachable manner on the conical part of the collet chuck (2).
14. Use of the device according to one of Claims 1 through 13 for a centrifuge.
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 |
|---|---|
| CA2229377A1 true CA2229377A1 (en) | 1997-12-18 |
Family
ID=7796899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002229377A Abandoned CA2229377A1 (en) | 1996-06-14 | 1997-06-06 | Device for fixing a rotor to a drive shaft |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0845086A1 (en) |
| CA (1) | CA2229377A1 (en) |
| DE (1) | DE19721335C2 (en) |
| WO (1) | WO1997047893A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19947465A1 (en) * | 1999-10-02 | 2001-04-05 | Ksb Ag | Shaft-hub connection |
| FR2852369B1 (en) * | 2003-03-13 | 2006-01-06 | Eurocopter France | COUPLING FLANGE SYSTEM FOR HOLLOW SHAFT |
| DE102012011531B4 (en) | 2012-06-08 | 2016-11-10 | Thermo Electron Led Gmbh | Set of drive head and hub for releasably connecting a drive with a rotor of a centrifuge for a wide speed range |
| JP6192860B1 (en) * | 2016-07-13 | 2017-09-06 | 株式会社久保田製作所 | Rotor mounting structure and centrifuge |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7222304U (en) * | 1972-09-07 | Peter Oskar | Clamping set for mounting the hub | |
| FR645181A (en) * | 1927-12-05 | 1928-10-20 | Wringer | |
| FR850824A (en) * | 1939-02-24 | 1939-12-27 | Device for fixing parts to shafts, pins, or other supports | |
| US2574773A (en) * | 1945-08-21 | 1951-11-13 | Nat Tube Co | Roll mounting |
| DE2611610C3 (en) * | 1976-03-19 | 1978-11-30 | Fritz Steller Gmbh & Co Kg, 5600 Wuppertal | Conveyor belt drum |
| US4202644A (en) * | 1978-07-10 | 1980-05-13 | Trantorque Corporation | Mounting device |
| US4367053A (en) * | 1978-11-06 | 1983-01-04 | Andrew Stratienko | Clamping device |
| DE8411110U1 (en) * | 1984-04-09 | 1985-08-08 | Kark, Uwe, 2104 Hamburg | Rolling device, consisting of a roll shaft, a roll ring and a conical sleeve |
| DE3607505C1 (en) * | 1986-03-07 | 1987-05-14 | Heraeus Separationstechnik Gmb | centrifuge |
| DE8612933U1 (en) * | 1986-05-13 | 1987-01-08 | Overbeck GmbH & Co, 2800 Bremen | Device for stopping an axle or the like. |
| SE463225B (en) * | 1988-05-25 | 1990-10-22 | Roger Svensson | DEVELOPMENT PARTS DEVICE |
| JP2691497B2 (en) * | 1993-02-27 | 1997-12-17 | マルマンゴルフ株式会社 | Golf club head manufacturing method |
-
1997
- 1997-05-22 DE DE19721335A patent/DE19721335C2/en not_active Expired - Lifetime
- 1997-06-06 EP EP97925053A patent/EP0845086A1/en not_active Withdrawn
- 1997-06-06 CA CA002229377A patent/CA2229377A1/en not_active Abandoned
- 1997-06-06 WO PCT/EP1997/002934 patent/WO1997047893A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997047893A1 (en) | 1997-12-18 |
| DE19721335A1 (en) | 1997-12-18 |
| DE19721335C2 (en) | 1999-07-29 |
| EP0845086A1 (en) | 1998-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |