Patent Application
20240247413
This application claims priority under 35 U.S.C. § 119 to German Patent Application No. 102023101812.4 filed Jan. 25, 2023, the contents of which are hereby incorporated by reference in their entirety.
The present invention relates to a friction disc for a false twisting device, with a hub comprising a mounting opening for inserting a shaft of the false twisting device, and with a race that circumferentially surrounds the hub when the friction disc is used as intended, wherein the race comprises a base body with a uniform cross section about an axis of rotation of the friction disc and the hub comprises a mounting contour adapted to correspond to the base body of the race, and wherein the race and the hub are detachably connected to one another. Furthermore, the invention relates to a race for a friction disc, a use of a race, a false twisting device, a use of a friction disc, and a method for changing a race of a friction disc.
In connection with the processing of curly textile threads, it is known to generate a false twist introduced by friction on the threads, which is then fixed by thermal treatment of the threads, for example in a texturing zone. In order to generate the false twist, false twisting devices that guide the thread along the circumferential surfaces of several rotating overlapping friction discs during the twisting process have proven themselves.
EP 0 708 188 A2 discloses a rotor disk for a spinning machine, comprising a hub ring, consisting of a first and a second carrier, that is radially connected rotationally fixed along the exterior to a support ring made of polymeric material. The hub ring and the support ring are non-destructively detachably attached to one another, and the first and second carriers are adapted to match one another and are arranged mirror-imaged in relation to one another. A surface profiling in the region of a recess of the carriers is adapted as an anti-rotation lock. The disadvantage of this is that the surface profiling only permits transferring low torque values. This allows the support ring to rotate relative to the hub ring, for example during the texturing process. In addition, the surface profiling makes the installation and removal of the support ring into the recesses of the carriers more difficult because this requires elastic deformation.
The object of the present invention is to eliminate the disadvantages known from the prior art. The task is in particular to create a friction disc on which the race and the hub can be easily separated from one another and are connected to one another secured against rotation and/or widening of the friction disc is used as intended.
The object is achieved by a friction disc, a race, a use of an race, a false twisting device, a use of a friction disc, and a method for changing a race of a friction disc having the features of the independent claims.
The invention proposes a friction disc for a false twisting device, with a hub comprising a mounting opening for mounting a shaft of the false twisting device, and with a race circumferentially surrounding the hub if the friction disc is used as intended. The race is for example formed from a polymer material, preferably polyurethane, or ceramic or metal. In addition, it is advantageous if the race comprises a coating, in particular made of polymeric and/or ceramic material.
When used as intended, the friction disc is arranged on the shaft of the false twisting device. A thread is then guided along the circumferential surfaces of several rotating, overlapping friction discs. The circumferential surface of the friction disc is then arranged on the race. The circumferential surface can for example be ground according to a predefinable profile.
The race comprises a base body with a uniform cross section about an axis of rotation of the friction disc and the hub comprises a mounting contour adapted to correspond to the base body of the race. The hub can then use the mounting contour to seat the race through the corresponding base body. The race and the hub are detachably connected to each other. The race and the hub can be non-destructively separated from each other. The race is subject to wear when the false twisting device is operated. The hub, on the other hand, remains usable at least for the service life of two or more races during operation of the false twisting device. The detachable connection of the race and the hub allows the race to be replaced and the hub to be reused. The hub is preferably made of a harder polymeric material, in particular a thermoplastic, for example Aramid and/or polybutylene terephthalate (PBT), and/or a metal, preferably a light metal, for example aluminum or magnesium.
According to the invention, the race comprises at least one locking section that increases the cross-section of the base body and is delimited along a direction of rotation of the friction disc, and the hub comprises at least one correspondingly adapted recess, wherein the locking section of the race and the recess of the hub form an interlocking anti-rotation lock in the connected state of the friction disc. The cross-section of the race is therefore not constant along the direction of rotation due to the at least one locking section. The locking section is preferably adapted as a projection positioned onto the base body. The changed shape of the cross-section along the direction of rotation permits transferring a torque from the race to the hub. If a torque thus acts on the race, it can be transferred to the hub by means of an interlocking connection. This torque can for example occur during profile grinding and/or when the friction disc is used as intended in the false twisting device.
In addition, the elastic pretensioning of the race is not necessary due to the correspondingly adapted hub. When connecting the race to the hub, the at least one locking section can be inserted into the correspondingly adapted recess without having to perform a deformation. This facilitates the machining and/or production of the friction disc or the exchange of the race.
It is advantageous if the race with the base body and the at least one locking section is formed integrally. Components made of polymeric material are often produced by injection molding. This allows the race to be manufactured in one process step, thus minimizing production costs.
It is also advantageous if the at least one locking section projects from the base body of the race along an axial direction. For example, the locking section of the race and the recess of the hub form an interlocking radial locking mechanism when the friction disc is used as intended. In such an embodiment, the at least one locking section and the corresponding recess firstly ensure that the race is detachably secured against twisting in relation to the hub, and secondly against widening. The interlocking radial locking feature secures the race against widening such that the unintentional separation from the hub is avoided.
It is also advantageous if the race is formed mirror-symmetrically, wherein the at least one locking section is preferably formed as a projection projecting axially from both sides of the base body. The locking sections can thus axially engage into the corresponding recesses mirror-symmetrically and/or on both sides, thus ensuring that the race is uniformly mounted on the hub. This avoids forces acting axially on one side. In addition, the mirror-symmetrical design of the race can prevent faulty assembly because it can be detachably connected to the corresponding hub independently of its orientation.
It is also advantageous if the race comprises at least two, preferably at least four, in particular at least six, locking sections, wherein two locking sections are separated from each other by respectively one gap section. In the region of the gap section, the race has the cross-section of the base body. The hub is then correspondingly adapted and thus comprises at least two, preferably at least four, in particular at least six, recesses. The load of the anti-rotation lock and/or the radial lock can thus be distributed. If the locking sections are adapted as projections, the projection height can be reduced by the plurality of locking sections. The highest possible torque values and/or forces can thus be absorbed by the anti-rotation lock and/or radial lock formed therefrom.
It is advantageous if the at least two locking sections and the at least one gap section are evenly distributed along the direction of rotation. The torque can thus be absorbed or transferred evenly along the direction of rotation.
Additionally or alternatively, it is advantageous if at least one of the locking sections transitions abruptly into the gap section. The cross-section of the race thus changes abruptly along the direction of rotation. As a result, a common abutment surface, which is preferably perpendicular to the direction of rotation, is formed between the locking section of the race and the recess of the hub, and which can absorb the torque. If the race has a plurality of locking sections and/or a plurality of gaps arranged between these that abruptly follow each other, the plurality of common abutment surfaces formed in this manner can absorb the torque.
It is also advantageous if the hub comprises at least two carriers, wherein the two carriers abut each other when the friction disc is used as intended and are detachably connected to the race. The two carriers preferably enclose the race in the axial direction. The recesses are then arranged in at least one of the carriers. When assembling the friction disc and/or replacing the race, the at least one locking section of the race can be inserted into the at least one recess of the at least one carrier. By abutting and/or connecting the second carrier, the two carriers are detachably connected to the race.
If the locking sections are adapted as projections projecting axially from the base body on both sides, the recesses are arranged in both carriers and incorporated along the axial direction. If the two carriers enclose the race in the axial direction, the locking sections with the recesses provide both the anti-rotation lock and the radial lock. The hub with the at least two carriers can be used to assemble the race without or with only a minor prior elastic deformation of the race.
It is also advantageous if one of the two carriers has a mounting ring with the mounting opening, the mounting ring extending completely over a width of the hub in the axial direction such that the hub can be seated on the shaft of the false twisting device by means of the mounting opening. The mounting opening is thus arranged integrally on the mounting ring of one of the carriers, which can ensure the most uniform possible abutment on the shaft of the false twisting device. The mounting opening is thus exclusively dependent on the manufacturing tolerances of the one carrier with the mounting ring. If the two carriers form an offset in relation to one another during assembly, in particular due to manufacturing tolerances, this has no effect on the mounting opening. The shaft can thus be mounted uniformly.
It is also advantageous if the hub comprises a connection means for connecting the at least two carriers, wherein the carriers are non-displaceably connected to one another by means of the connection means, and wherein the carriers can be separated from one another by detaching the connection means. The carriers abutting to each other can thus be connected to each other. This avoids separating the carriers from the race. In the connected state, the locking sections remain, in particular completely, within the recesses, thus maintaining the anti-rotation lock and/or the radial lock. If the carriers are separated from one another by loosening the connection means, the race can be removed and/or replaced.
It is furthermore advantageous if the connection means has at least one clip on at least one first carrier and a clip opening corresponding to the clip on at least one second carrier. When making the connection, the clip of the first carrier preferably projects through the clip opening of the second carrier. The first carrier with the clip and the second carrier with the clip opening are preferably respectively formed integrally. Thus, no further components are necessary for the connection means, for example screws or rivets. The connection means is then only formed by the two carriers.
It is advantageous if the clip and/or the clip opening comprises a latching lug for latching and/or securing the clip connection. The latching lug is therefore preferably also a component of the first carrier with the clip or the second carrier with the clip opening. The at least one latching lug represents a simple connection of the two carriers.
It is advantageous if the connection means is adapted as an axial clip connection, wherein the at least one clip is inserted into the at least one corresponding clip opening until the latching lug engages along the axial direction. The two carriers are thus connected by pushing them together along the axial direction until the clip connection is made and the at least one latching lug is engaged. The enclosed race, which preferably comprises the axially projecting locking sections, forms an interlocking connection to the carriers in the assembled state of the friction disc. The clip connection is adapted such that the latching lug engages when the carriers are positioned against one another. If the locking sections and/or the recesses in the carrier are also formed along the axial direction, the respective carriers can be very easily adapted to be deformable along the axial direction as injection-molded components. Undercuts that require complex sliders during the injection molding process can thus be avoided.
It is also advantageous if at least one centering pin is arranged on the first carrier and at least one centering opening corresponding to the centering pin is arranged on the second carrier for centering and/or guiding the at least two carriers along the axial direction. The centering pin ensures that the carriers are moved toward each other centered and prevents them from being moved toward one another twisted in the axial direction. Any—even only slight—rotation of the carriers could prevent the assembly and/or connection of the carriers to the race at least partially arranged between them. Involuntary elastic and/or plastic deformations of the race can also be avoided as a result. In addition, the centering pins can transfer the torque acting on one of the carriers to the other, which allows a uniform load distribution when the friction disc is used as intended.
It is advantageous if the connection means is adapted as a bayonet connection, wherein the at least two carriers abut each other and are then rotated relative to each other along the direction of rotation until the latching lug engages. The bayonet connection provides an alternative connection means. A bayonet connection is defined as a connection by means of connecting and rotating the two carriers. This provides a simple yet solid connection. When exchanging the race, the bayonet connection can also simplify separating the two carriers because the latching lug can be formed on the at least one clip such that the latching lug is released by a predetermined movement (for example by compressing and twisting the two carriers).
It is also advantageous if the at least one locking section of the race projects exclusively on one side along the axial direction from the base body of the race in the hub with the connection means adapted as a bayonet connection. The carriers can as a result also be twisted against each other when abutting and the bayonet connection can be closed or disconnected.
The invention also proposes a race for a friction disc. The race comprises a base body having a constant cross section about an axis of rotation of the friction disc. According to the invention, the race comprises at least one locking section that increases the cross-section of the main body and that is delimited along a direction of rotation of the friction disc. This has the advantage that the locking section is already arranged on the race. A locking section formed by elastic deformation and/or produced with a further manufacturing step is not required. The race is preferably suitable for the friction disc according to the above description, wherein the aforementioned features of the friction disc can be present individually or in any combination.
It is advantageous if the race is adapted according to the above description, wherein the specified features can be present individually or in any combination.
The invention further proposes a use of a race according to the above description for a friction disc. The race is preferably used in the friction disc according to the above description, wherein the specified features can be present individually or in any combination.
The invention further proposes a false twisting device comprising a bearing block having at least one rotatably mounted shaft and comprising at least two friction discs arranged along the shaft at a distance in relation to one another on the shaft. According to the invention, at least one of the friction discs is adapted according to the above description, wherein the specified features can be present individually or in any combination.
The invention further proposes a use of a friction disc according to the above description in a false twisting device for processing and/or producing textile threads. Preferably, the false twisting device is adapted according to the above description, wherein the specified features can be present individually or in any combination.
The invention further proposes a method for changing a race of a friction disc. The method comprises the following steps: Provide a friction disc comprising the race according to the above description, wherein said features can be present individually or in any combination. Separate the hub and the race from each other. Provide a new race. Replace the race with the new race. Insert the new race with the at least one locking section into the at least one recess of the hub.
For a two-part hub, the two carriers are preferably subsequently detachably connected to one another, wherein the race is held in an interlocking manner between the carriers when inserted into the at least one recess of at least one of the carriers.
Further advantages of the invention are described in the following exemplary embodiments. These show in
In the following description of the figures, the same reference symbols are used in the various figures for identical and/or at least comparable features. The individual features, their design and/or mode of action are usually only explained in detail when mentioned first. If individual features are not explained in detail again, their design and/or mode of action corresponds to the design and mode of action of the features already described with the same mode of action or under the same name.
As can be seen further in
The exact embodiment of an inventive friction disc 5 according to an exemplary embodiment is explained in more detail below with reference to
The race 8 comprises a base body 9 with a uniform cross section about the axis of rotation RA of the friction disc 5. The hub 6 comprises a mounting contour 10 adapted to correspond to the base body 9. The race 8 also comprises at least one locking section 11 that increases the cross-section of the base body 9 and is delimited along the direction of rotation DR. The hub 6 comprises at least one recess 12 adapted to correspond to the locking section 11. The detail shown in
The locking sections 11 of the race 8 and the recesses 12 of the hub 6 engage into each other in the connected state of the friction disc 5 such that an interlocking anti-rotation lock is formed. In the shown exemplary embodiment, the locking sections 11 project from the base body 9 of the race 8 along a radial direction RR. The recesses 12 of the hub 6 are thus also formed along the radial direction RR. The mounting contour 10 is partially recessed in radial direction RR by the recesses 12. A gap section 13 is formed between each two locking sections 11. In the region of the gap section 13, the race 8 comprises the base body 9, which remains constant in cross section, and the hub 6 comprises the corresponding mounting contour 10.
In the exemplary embodiment shown, the race 8 is formed integrally with the base body 9 and the at least one locking section 11. In the exemplary embodiment of
The friction disc 5 can comprise an additional axial lock 22 to prevent unwanted separation of the race 8 from the hub 6 along an axial direction AR of the friction disc 5. In the shown exemplary embodiment, the axial lock 22 can either be formed circumferentially along the axis of rotation RA and can thus be a component of the base body 9 on the race 8. Alternatively, the axial lock 22 can be formed on the race 8 as a component of the locking section 11 and can thus be delimited along the direction of rotation DR. In the aforementioned alternatives, the hub 6 is respectively adapted to correspond to the mounting contour 10 and the at least one recess 12.
In contrast to the exemplary embodiment in
In the exemplary embodiment in
As shown in
To assemble the hub 6 consisting of the two supports 14a, 14b, the latter can be attached in axial direction AR. The connection means 16 is thus adapted as an axial clip connection. The clips 17 are then inserted into the corresponding clip openings 18 and the centering pins 20 are inserted into the corresponding centering openings 21. Before the two carriers 14a, 14b are assembled, the race 8 can be inserted into one of the two carriers 14a, 14b. In the exemplary embodiment shown, this is done by inserting the locking sections 11 of the race 8 into the corresponding recesses 12 of one of the carriers 14a, 14b. After assembly, the locking sections 11 and/or the gaps 13 detachably connect the race 8 to the two carriers 14a, 14b rotationally fixed and/or secured against widening.
In the exemplary embodiment shown, the second carrier 14b comprises the mounting ring 15 with the mounting opening 7. The mounting ring 15 extends over a width of the hub 6. The first carrier 14a abuts the mounting ring 15 of the second carrier 14b in radial direction RR. Additionally or alternatively to the centering pin 20 and the centering opening 21, this abutment allows the two carriers 14a, 14b to be guided and/or centered toward one another during assembly. The two carriers 14a, 14b can be adapted to prevent rotation along the direction of rotation DR by means of the centering pins 20 and the centering opening 21.
To assemble the hub 6 consisting of the two carriers 14a, 14b, the latter can first be mounted in axial direction AR and the clips 17 can be inserted into the clip opening 18. The carrier 14a, 14b is then subjected to a rotational movement along the direction of rotation DR until at least one of the latching lugs 19 arranged on one of the clips 17 engages into a latching opening 23. The two carriers 14a, 14b are thus anti-rotationally connected to one another.
The race 8 is not shown in the exemplary embodiment shown. The locking sections 11 and the corresponding recesses 12 of the hub 6 are also not shown in the exemplary embodiment shown. The locking sections 11 of the race 8 can be adapted similar to the exemplary embodiment of
The present invention is not limited to the illustrated and described exemplary embodiments. Modifications within the scope of the claims as well as a combination of the features are also possible, even if they are shown and described in different exemplary embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2023 101 812.4 | Jan 2023 | DE | national |
