AT518237B1 - Friction wheel unit and extrusion machine with such a friction wheel unit - Google Patents

Abstract

The invention relates to a friction wheel unit (35) of an extrusion machine (1). This comprises a friction wheel (4) and driver rings (25) arranged on both sides, which are arranged in the axial direction directly adjacent to the friction wheel (4). First coupling devices (33) are each formed by a claw coupling or spur gearing and each comprise a plurality of mutually engaging first and second coupling elements (39, 40). The first coupling elements (39) are an integral part of the friction wheel (4) and the second coupling elements (40) are each an integral part of the two driver rings (25). The first coupling elements (39) arranged on both sides of the friction wheel (4) are arranged offset to one another in the circumferential direction. The invention also relates to an extrusion machine (1) with such a friction wheel unit (35).

Description

The invention relates to a friction wheel unit of an extrusion machine and an extrusion machine with such a friction wheel unit.

[0002] EP 0 408 259 B1 has disclosed a generic device for continuous extrusion, which has a rotatable wheel with a circumferential groove. The extrusion tool, which is composed of a plurality of tool elements, is inserted in a stepped receiving opening in a tool holder mounted about a pivot axis on the basic position. In the open position of the tool holder, the extrusion tool can be removed from it in the bottom direction. The stripping element is held in a screwed and clamped position screwed to the tool elements forming the extrusion tool.

CN 101733298 A describes another generic extrusion machine for the continuous production of profiles from a formable extrusion. The machine comprises a base frame, at least one friction wheel rotatable about a drive axis, which is in drive connection with a drive unit, and at least one pressure roller for the extruded material to be formed on the friction wheel. Furthermore, a tool holding device is pivotally mounted on the base frame about a pivot axis, which is pivotable between a working position and a release position. A tool unit is accommodated in the tool holding device and is also supported thereon. The tool unit comprises a receiving cage which has a first receiving cage part arranged on the inlet side and a second receiving cage part arranged on the outlet side. The two receiving cage parts are connected to one another via connecting means. In the first receiving cage part, a receiving channel is formed which penetrates this in the direction of passage of the extruded material. In the second receiving cage part, a receiving space is formed which faces the first receiving cage part and is open towards the latter, which is delimited at least in regions with a support surface on the outlet side. Furthermore, a stripping element for the deformable extruded material is arranged on the inlet side. A die is accommodated in the receiving cage and has a shaping channel for shaping the profile to be produced. The die is arranged downstream of the receiving channel in the direction of passage of the extruded material and is supported on the support surface delimiting the receiving space on the outlet side.

WO 2015/070274 A2 describes a further generic extrusion machine with a friction wheel which can be coupled to the drive shaft parts of the drive shaft with the interposition of driver rings arranged on both sides in the axial direction. Between the driving ring and the friction wheel, a form-fitting coupling connection is provided by means of separate bolts or pegs, which are each to be inserted into bores arranged in alignment with one another. The disadvantage here is the higher processing costs and the risk of the coupling elements knocking out against one another.

The object of the present invention was to provide a friction wheel unit and an extrusion machine equipped therewith, by means of which a flawless and almost wear-free torque transmission for driving the friction wheel, in particular with one or more forming grooves, is also possible over a longer period of use , Furthermore, it should also be possible to achieve a better radial concentricity.

This object is achieved by a friction wheel unit and an extrusion machine equipped therewith according to the claims.

[0007] The friction wheel unit of an extrusion machine according to the invention comprises:

- At least one friction wheel, the friction wheel has a first end face and a second end face spaced axially therefrom as well as an outer peripheral face and an inner peripheral face, a longitudinal axis extending between the first end face and the second end face,

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AT 518 237 B1 2019-12-15 Austrian Patent Office [0009] - a driver ring arranged on both sides of the friction wheel, which driver rings are arranged in the axial direction immediately adjacent to one of the end faces of the at least one friction wheel, [0010] - a first coupling device each positive transmission of a torque from the driver rings arranged on both sides of the friction wheel to the at least one friction wheel, the first clutch devices each being formed by a dog clutch or spur gear teeth and the first clutch devices each comprising a plurality of mutually engaging first and second clutch elements, - The first coupling elements are formed as an integral part of the at least one friction wheel on both end faces and in the circumferential direction between immediately adjacent first coupling elements each have a receiving space for one of the second K is formed, the second coupling elements as an integral part of the two driving rings are each formed on a driving ring end face facing the friction wheel, and [0014] the first coupling elements arranged in the region of the first end face of the friction wheel and the first coupling elements arranged in the region of the second end face of the friction wheel are arranged offset to one another in the circumferential direction.

The advantage achieved thereby is that the integral design of the first coupling elements directly on the friction wheel so that transmission of drive torques can be achieved in a small space in the axial direction. The mutual interlocking of the first and second clutch elements also allows a more direct transmission of the torque to the friction wheel. Furthermore, a compact design of the coupling device can also be achieved in the area of the driving ring (s) without additional components.

By arranging the first clutch device on both sides in the area between the friction wheel and the driving rings, a more symmetrical torque input onto the friction wheel can be achieved. In addition, by arranging the first coupling elements offset relative to one another in the circumferential direction, excessive weakening of the friction wheel in the direction of its axial extent can be prevented.

Furthermore, the machining of the friction wheel and the drive ring or rings connected therewith can be simplified by the choice of a claw coupling or spur toothing as a coupling device, and additional components can also be dispensed with. In addition, a compact and easily engaging coupling device can be created. By selecting the claw coupling or the spur toothing, the torque to be transmitted can thus be divided over a larger area than in the case of pin connections that have been used up to now. Depending on the choice of fit between the coupling parts or coupling elements which are in engagement with one another, the coupling device or coupling devices formed by the claw coupling or the spur toothing can also achieve an additional good centering effect, in particular concentric concentricity. Mutual wear can thus be reduced even further.

Another possible embodiment has the features that the first coupling elements extend continuously between the outer peripheral surface and the inner peripheral surface of the at least one friction wheel. This enables a continuous transmission of the torque between the first and second clutch elements over the entire radial height of the friction wheel. This radial longitudinal extension of the individual coupling elements can thus provide a larger area that is available for direct torque transmission. So that can

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AT 518 237 B1 2019-12-15 Austrian patent office but also the power transmission is improved and the surface load per unit area is further reduced.

A further embodiment provides that each of the first coupling elements, viewed in the circumferential direction, is delimited by a first and second coupling surface that extends between the outer circumferential surface and the inner circumferential surface and is designed to be straight and flat. The straightforward, flat design of the lateral delimitation of the coupling elements makes it easier to manufacture them and thus enables more cost-effective production.

Another embodiment is characterized in that the first coupling surface and the second coupling surface are aligned in the radial direction with respect to the longitudinal axis. This can create an orientation of the lateral or circumferential boundary of the coupling elements that is always directed towards the center.

A further preferred embodiment is characterized in that the first coupling surface and the second coupling surface delimiting the receiving space are aligned parallel to one another by first coupling elements arranged one behind the other in the circumferential direction. As a result, the further or second coupling elements can also be designed to run parallel to one another in the direction of their radial longitudinal profile. This also makes it easier to change the friction wheel and to bring the first and second coupling elements into engagement with one another.

Furthermore, it may be advantageous if at least one damping element is arranged between the first and second coupling elements which are immediately adjacent in the circumferential direction and one behind the other. As a result, peak values of the drive or torque can be better cushioned and mutual damage of coupling elements that are in engagement with one another can be reduced. Furthermore, longer service lives and quieter operation of the drive unit can also be achieved.

A further possible and possibly alternative embodiment has the features that coupling elements of a second coupling device are arranged on the driver rings arranged on both sides of the friction wheel in the axial direction on the side facing away from the friction wheel. By providing the further coupling device between the at least one driver ring and the respective drive shaft part, a simple exchange of the driver ring can also be made possible.

[0024] The invention also relates to an extrusion machine for the continuous production of a wide variety of profiles from a formable extrusion, which comprises the following assemblies or components:

- a base frame, [0026] - at least one friction wheel unit, which friction wheel unit can be rotated about a drive axis and at least one friction wheel and on both sides of the friction wheel each have a driving ring, the friction wheel unit being in drive connection with a drive unit, [0027] - at least a pressure roller, a tool holding device, which tool holding device is held on the base frame and seen in the direction of passage of the profile to be produced, is arranged downstream of the friction wheel, at least one tool unit, which tool unit is supported on the tool holding device.

For a better understanding of the invention, this will be explained in more detail with reference to the following figures.

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AT 518 237 B1 2019-12-15 Austrian Patent Office [0031] Each shows in a highly simplified, schematic representation:

1 shows an extrusion machine in a side view and a stylized representation;

the extrusion machine in the area of the drive unit, in a position clamping the friction wheel unit, in section;

a possible design of the friction wheel unit, in a graphical representation; 3 in view of its first end face.

[0034] Fig. 4 [0036] In the introduction it should be noted that in the differently described embodiments the same parts are provided with the same reference numerals or the same component designations, the disclosures contained in the entire description correspondingly referring to the same parts same reference numerals or same component names can be transferred. The location information selected in the description, e.g. above, below, to the side, etc., referring to the figure described and illustrated immediately, and if the position is changed, these are to be applied to the new position.

The term “in particular” is understood below so that it can be a possible more specific training or more detailed specification of an object or a method step, but does not necessarily have to represent a mandatory, preferred embodiment of the same or a mandatory procedure.

In Fig. 1, an extrusion machine 1 is shown in a highly stylized representation, which is used to produce profiles 2 starting from a formable extrusion 3. The profiles 2 to be produced can have the most varied of cross-sections, it being possible to produce only one profile 2 or also several profiles 2 at the same time. For example, the profile cross section can be open or closed. Furthermore, it can be a hollow profile or a full profile. In principle, the profile 2 can have any cross-sectional shape with a corresponding longitudinal extent.

The extrusion machine 1 shown schematically here represents a special form of the extrusion machine 1, which enables continuous production of at least one profile 2. In this case, as extruded material 3, for example, at least one continuously supplied wire or a plurality of the same and / or a rod material with a diameter between 5 and 30 mm is fed to the extrusion machine 1 and there via a driven friction wheel 4, depending on the material to be formed, up to 500 ° C. and above heated. The doughy material after heating is pressed through a die arranged immediately after the friction wheel 4, the shaping process taking place in this section. This continuous process is mainly used for profiles 2 of small and medium-sized dimensions. A wide variety of materials such as aluminum, copper, non-ferrous metals or their alloys can be formed. The shaping process which can be carried out continuously over a longer period in this extrusion machine 1 and the fact that a single, relatively small and simply constructed extrusion machine 1 is necessary for this allow a cost reduction compared to the conventional extrusion machines.

The extrusion machine 1 can basically comprise a base frame 5 and a tool holding device 6, which is pivotably or rotatably mounted on a pivot axis 7 held on the base frame 5. The pivoting movement is illustrated in a simplified manner with a double arrow in the region of the pivot axis 7. For example, the tool holding device 6 can be pivoted between a working position shown in full lines and a release position shown in broken lines. For the sake of clarity, the representation of swivel drives or adjustment mechanisms has been dispensed with, although it should be mentioned that all devices or elements known from the prior art can be used here. Furthermore, the tool holding device 6 is seen in the direction of passage of the profile 2 to be produced, downstream of the friction wheel 4.

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AT 518 237 B1 2019-12-15 Austrian Patent Office [0041] The friction wheel 4 can be rotated about a drive axis 8 in a known manner and is also in drive connection with a drive unit 9, which is only indicated schematically. Furthermore, the at least one friction wheel 4 also has at least one circumferential groove or else a plurality of circumferential grooves arranged next to one another in the axial direction, which serves or serve to receive the extruded material 3 supplied. Furthermore, at least one pressure roller 10 can be assigned to the friction wheel or wheels 4, by means of which the extrusion material 3 entering and extruding into the extrusion machine 1 is pressed in the radial direction onto the friction wheel or wheels 4.

The extrusion machine 1 can furthermore also comprise a locking device 11 which, for example, is also pivotally mounted on the base frame 5. The locking device 11 serves to hold the tool holding device 6 positioned relative to the base frame 5, in particular the friction wheel 4, during its working position and operation. A double arrow entered in the area of the locking device 11 schematically represents the possibility of displacement of the locking device 11.

The locking position for the tool holding device 6 is shown in FIG. 1. The illustration of their mounting on the base frame 5 and the adjustment mechanisms required for this purpose was also omitted for the sake of clarity. For example, the locking device 11 can be formed by an approximately U-shaped holding frame, in which the two holding arms are pivotally mounted laterally on the base frame 5. A base arm connecting the two holding arms on the outside, for example, engages around the tool holding device 6 in the locking position and prevents the tool holding device 6 from pivoting away from its working position. Furthermore, at least one tool unit 12, which is only schematically indicated here, is usually accommodated or arranged in the tool holding device 6.

In a known manner, a gap is formed between the tool unit 12 and the friction wheel 4 when the extrusion machine 1 is in operation and thus when the tool holding device 6 is in the working position, so as to avoid mutual collisions and associated mechanical damage in this area.

The gap width of the gap between the friction wheel 4 and the tool unit 12 depends on the one hand on the temperature of the system parts and on the other hand on signs of wear of the tool unit 12 and the friction wheel 4.

It is also shown in this embodiment that, in addition to the locking device 11, a separate adjusting device 14 can be arranged on the base frame 5 in an end region 13 of the tool holding device 6 that is distant from the pivot axis 7 and opposite the drive axis 8 of the friction wheel 4. The adjusting device 14 has an adjusting element 15 that is adjustable relative to the base frame 5. The actuating element 15 in turn has an actuating surface 16 facing the end region 13 of the tool holding device 6 and a guide surface 17 facing away from the tool holding device 6.

As can be seen from the schematic representation of the control element 15, in this embodiment the control surface 16 and the guide surface 17 are aligned in a wedge shape with respect to one another. The guide surface 17 is supported on a section of the base frame 5, which is not designated in any more detail, in particular in the form of a sliding surface. The actuating element 15 is also connected to an actuating mechanism (not described in more detail) and is adjustable relative to the base frame 5 in the direction of a schematically indicated double arrow. Thus, the guide surface 17 runs approximately vertically, with the positioning surface 16 oriented inclined thereto extending from the top left to the bottom right, as can be seen from the side view of the extrusion machine 1. On that side facing the control element 15, the tool holding device 6 has a support surface 18 which is supported in the working position against the control surface 16.

The locking device 11 described above can also at least one printing unit

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AT 518 237 B1 2019-12-15 Austrian patent office with at least one pressure element 20. When the tool holding device 6 is in the working position, the pressure element 20 is also arranged on the end region 13 distanced from the pivot axis 7, but is in contact with the tool holding device 6 on a second side facing away from the friction wheel 4. Furthermore, the support surface 18 of the tool holding device 6 can be pressed against the footprint 16 of the control element 15 by means of the pressure unit 19. Because the actuating element 15 is also supported with its guide surface 17 on the base frame 5, the tool holding device 6 can be moved about its pivot axis 7 due to the wedge-shaped, in particular acute-angled, mutually oriented actuating surface 16 and when the actuating element 15 is relatively displaced by means of the actuating device 14 Guide surface 17 are pivoted. Since the tool holding device 6 corresponds in the broadest sense to a lever or a lever arrangement, the gap width formed between the tool unit 12 and the friction wheel 4 can also be changed as a result of the adjustment of the adjusting element 15.

2 shows a possibly independent embodiment of the drive unit 9, in particular a friction wheel unit 35, of the extrusion machine 1, the same reference numerals or component designations being used for the same parts as in the previous FIG. 1. In order to avoid unnecessary repetitions, reference is made to the detailed description in the previous FIG. 1. In particular, the friction wheel unit 35 can represent an independent assembly. Furthermore, this can also form a structural unit or system unit in connection with the extrusion machine 1.

The drive unit 9 shown here in simplified form can itself be formed from a large number of very different assemblies and components. The drive torque for the friction wheel 4 can take place, for example, by means of a drive motor with an optionally downstream transmission and a drive shaft 21. The transmission of the drive torque to first and second drive shaft parts 23, 24 arranged on both sides of the friction wheel 4 and rotatably mounted on frame parts of the base frame 5 can take place via a coupling 22. At least one of the drive shaft parts 23, 24 is designed to be adjustable in the axial direction with respect to the base frame 5 from a contact position resting on the friction wheel 4 to a change position for the friction wheel 4 distant from the friction wheel 4. In the present exemplary embodiment, the assembly of the drive shaft part 23 and the coupling 22 connected to it on the right here is fixed in place on the base frame 5, in particular its right frame part. Furthermore, it is also shown here that the friction wheel 4 is supported on the drive shaft parts 23, 24 arranged on both sides next to it, optionally with the interposition of at least one drive ring 25. In addition, the friction wheel 4 can still be clamped in the axial direction between these two drive shaft parts 23, 24 and optionally the at least one drive ring 25. Centering with respect to the common drive axis 8 can be provided on both sides between the friction wheel 4 and the drive shaft parts 23, 24.

Between the friction wheel 4 and at least one, but preferably both drive shaft parts 23, 24, a first clutch device 33 is provided in the present exemplary embodiment. The formation of the same is described in more detail below. As already mentioned in the introduction, depending on the selected choice of fit of the coupling parts in engagement with one another, the first coupling device 33 can also form a centering device for concentric concentricity. The first coupling device 33 can also be referred to as a connecting and centering device.

Furthermore, it can also be seen here that the two drive shaft parts 23, 24 each have a cylindrical first and second receiving opening 26, 27 in the center thereof. Their axes are preferably aligned with one another in order to be able to accommodate a common support axis 28 therein. With an appropriate choice of fit, an additional supporting effect of the two drive shaft parts 23, 24 can also be achieved in the center thereof. However, this can also increase the inherent rigidity of the entire drive unit 9. The support axis 28 is supported in the axial direction on the drive shaft arranged here on the left

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AT 518 237 B1 2019-12-15 Austrian patent office part 24 on the side facing away from the friction wheel 4 and extends through the drive shaft part in the area of its receiving opening 27. Furthermore, the support axis 28 projects through the at least one friction wheel 4, at least one of the driving rings 25 and projects into into the first receiving opening 26 of the first drive shaft part 23.

Furthermore, the support axle 28 can be provided with an external thread 29 on an axle end region facing the first drive shaft part 23. In order to also be able to form-fitly couple the support axis 28 with its axis end region to the first drive shaft part 23, the first receiving opening 26 of the first drive shaft part 23 can be provided with an internal thread 30 at least in sections. Thus, the support axis 28 can be connected to the first drive shaft part 23 in a tensile manner in the axial direction. It should be noted that instead of the thread arrangement, comprising the external thread 29 and the internal thread 30, other form-fitting, tension-resistant connecting means can also be provided in order to be able to couple or connect the support axis 28 to the first drive shaft part 23 in a tensile manner.

If the support axis 28 is in its position connected to the first drive shaft part 23 in a tensile manner, the second drive shaft part 24 can be adjusted in the direction of the first drive shaft part 23 by means of appropriately designed tension and / or pressure elements, so that the friction wheel 4 in the axial direction is held clamped between the two drive shaft parts 23, 24.

The friction wheel 4 has end faces 31, 32 spaced apart from one another in the axial direction, each of which preferably extends in a plane oriented perpendicularly with respect to the drive axis 8. It is also shown that a separate driver ring 25 is arranged between the friction wheel 4 and each of the two drive shaft parts 23, 24. Furthermore, the form-fitting first coupling device 33 is provided between at least one of the end faces 31, 32, preferably between each of the end faces 31, 32, and the at least one driver ring 25 or the driver rings 25. So far, a bolt connection has been selected for this, in contrast to which, in the present invention, a type of claw coupling or spur toothing has been selected as the coupling means.

Between the at least one driver ring 25 and the respective drive shaft part 23 and / or 24, a second coupling device 34 is provided, which is also formed on a positive basis. This second coupling device 34 or the second coupling devices 34 can e.g. be formed by bolt connections, as is indicated in a simplified representation. For this purpose, both in at least one driver ring and in the respective drive shaft part 23 and / or 24, alignment bores aligned with one another are provided, in each of which one of the bolts or pins is inserted and received. The bolts or pins are preferably arranged uniformly distributed over the circumference. Irrespective of this or in addition to this, it would also be possible to design at least one of the second coupling devices 34 by means of the claw coupling or spur toothing described above, as was described above for the design of the first coupling device 33.

The friction wheel 4 with the at least one driver ring 25, but preferably both driver rings 25 arranged on both sides, forms or form a friction wheel unit 35. If the driver ring 25 or the driver rings 25 are provided, they can remain in their coupled position when the friction wheel is changed on the respective drive shaft parts 23 and / or 24. By moving the support shaft 28 out of the first drive shaft part 23 and the receiving area of the friction wheel 4 and a sufficient adjustment or opening path of the second drive shaft part 24 to disengage at least the first or the first clutch devices 33, the friction wheel 4 can be changed or exchanged as is well known.

3 and 4, the friction wheel unit 35 of the extrusion machine 1, which has been briefly described and indicated previously in FIGS. 1 and 2, is shown on its own. In this exemplary embodiment shown here, the friction wheel unit 35 comprises a friction wheel 4 and that in the axial direction

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AT 518 237 B1 2019-12-15 Austrian patent office, each with driver rings 25 shown on both sides at a distance therefrom. The friction wheel unit 35 can also comprise several friction wheels 4 and / or only one or even more, preferably two, driver rings 25.

As already described above, a driver ring 25 can be arranged on at least one of the two drive shaft parts 23 and / or 24 between them and the at least one friction wheel 4 for transmitting the drive or torque. The one or more driver rings 25 are preferably arranged in front end areas of the drive shaft parts 23, 24 and coupled or connected to them in a rotationally fixed manner. The first clutch device 33 is in each case formed between the friction wheel 4 and the driving ring 25 arranged directly adjacent to it. The friction wheel 4 shown here has the first end face 31 on its right side and the second end face 32 on its left side.

Furthermore, it is also shown that the friction wheel 4 can be approximately hollow-cylindrical. As a result, the friction wheel 4 is delimited circumferentially between the two end surfaces 31 and 32 by an outer circumferential surface 36 and an inner circumferential surface 37. In the outer circumferential surface 36, only one receiving groove for the extruded material 3 to be accommodated and to be formed is indicated in a simplified manner, wherein several of these can also be provided. The inner circumferential surface 37 serves to be able to accommodate the above-described support axis 28 therein, wherein an appropriate choice of fit must be taken into account in order to support the friction wheel 4 on or on the support axis 28. If a narrow tolerance is selected, the friction wheel 4 can be exactly centered on the support axis 28 passing through it for its concentricity. Due to the hollow-cylindrical design of the friction wheel 4, a longitudinal axis 38 extends between the first end face 31 and the second end face 32, which extends in the installed state of the friction wheel 4 coaxially or congruently with respect to the drive axis 8 or is aligned therewith. In the exemplary embodiment shown here, the at least one first coupling device 33 is formed by a dog clutch. Irrespective of this, it would also be possible to also form the at least one first coupling device 33 by means of end teeth in the area of at least one of the end faces 31 and / or 32.

The first clutch device 33 comprises a plurality of mutually engaging first and second clutch elements 39, 40. The at least one first clutch device 33 is used for the positive transmission of a torque or drive torque from at least one drive ring 25 to the at least one friction wheel 4 With appropriate choice of fit, the concentricity centering described above can also be achieved. If a driver ring 25 is arranged on each side of the friction wheel 4, a further drive or a torque is applied to the driver ring or rings 25 starting from at least one of the drive shaft parts 23 and / or 24.

The first clutch elements 39 arranged on the friction wheel 4 are an integral part of the at least one friction wheel 4. An integral part is understood to mean that the individual, first clutch elements 39 are also designed to project beyond one of the end faces 31 and / or 32 in the axial direction are and not by a separate part, such as a bolt are formed. It would be conceivable to design the first and / or the second coupling elements 39, 40, for example, by segment pieces and to connect them in a fixed manner, in particular by means of a material connection to the friction wheel 4 and / or the driving ring 25. When the first coupling elements 39 protrude or protrude beyond one of the end faces 31 and / or 32, as seen in the circumferential direction, a receiving space 41 for one of the second coupling elements 40 is formed between immediately adjacent, first coupling elements 39.

In the course of the manufacturing process of the first coupling device 33 on at least one of the end faces 31 and / or 32, the material forming the friction wheel 4 can be removed, in particular removed, in this section, for example to form the receiving space (s) 41. As a result of this removal or the removal of the material to form the receiving spaces 41, the first coupling elements 39 remain as projecting coupling parts

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AT 518 237 B1 2019-12-15 Austrian patent office obtained. It would also be possible to produce the friction wheel 4 and / or the driving ring (s) 25 in one casting process and to rework the interacting first and second coupling elements 39, 40 accordingly.

It is also shown here that the second coupling elements 40 are also formed as an integral part of the at least one driver ring 25 on the latter. Here, the second coupling elements 40 are each formed on a driving ring end face 42 facing the friction wheel 4. The second coupling elements 40 likewise protrude the respective driving ring end face 42 in the axial direction onto the friction wheel 4. Between the second coupling elements 40, further receiving spaces 43 are formed in the area of the driving ring end face 42. The further receiving spaces 43 serve to receive the first coupling elements 39, which are formed on the friction wheel 4. It is important to ensure that the coupling elements 39, 40 and the receiving spaces 41, 43 of the first coupling device 33 are matched in the same way in order to ensure an almost backlash-free coupling and thus perfect power transmission of the torque or drive torque.

The first coupling elements 39 formed on the friction wheel 4 preferably extend continuously between the outer circumferential surface 36 and the inner circumferential surface 37. The surface load (force per unit area) can thus be distributed over a larger area between the two coupling elements 39 and 40, as a result of which the value of the surface pressure can be reduced.

Preferably, each of the first coupling elements 39 is seen in the circumferential direction by a first and second coupling surface 44, 45 extending between the outer circumferential surface 36 and the inner circumferential surface 37. Each of the two coupling surfaces 44, 45 is preferably aligned in a straight line. In addition, however, each of the coupling surfaces 44, 45 should also be flat. The coupling surfaces 44 and / or 45 can furthermore have an alignment in the parallel direction with respect to the longitudinal axis 38. A right angle is thus enclosed between the first coupling surfaces 44 and the second coupling surfaces 45 and one of the end surfaces 31 and / or 32. In order to facilitate a simple engagement process of the first and second clutch elements 39, 40, the first and second clutch surfaces 44, 45 of each first clutch element 39 can be aligned slightly towards one another on the side facing away from the friction wheel 4. The same also applies to the end faces of the second coupling elements 40, which are not designated in any more detail. If the coupling surfaces of the second coupling elements 40 interacting with one another and which are not specified, the mutual engagement of the two coupling elements 39, 40 without play in the circumferential direction can thus be achieved. A further, improved centering effect for the concentricity centering can thus be achieved.

Furthermore, different longitudinal orientations or longitudinal profiles of the two coupling surfaces 44 and / or 45 are possible. For example, the first coupling surface 44 and the second coupling surface 45 can each be aligned in the radial direction with respect to the longitudinal axis 38. This alignment allows “pie sections” to be formed which run exactly along the longitudinal axis 38.

Irrespective of this, it would also be possible that the respective first coupling surface 44 delimiting the receiving space 41 and the second coupling surface 45 are aligned parallel to one another by first coupling elements 39 arranged one behind the other in the circumferential direction. An approximately radial alignment with respect to the longitudinal axis 38 can thus be achieved. This possible design is shown in FIG. 4 in the lower area of the friction wheel 4.

In order to avoid a direct mutual abutment and an associated direct support of the first and second coupling elements 39, 40, at least one damping element 46 could be arranged or provided between them. The damping element or elements 46 could be directly adjacent between the circumferential direction

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AT 518 237 B1 2019-12-15 Austrian patent office must be arranged and configured first and second coupling elements 39, 40 arranged one behind the other. A wide variety of materials with, in particular, elastic properties can be used as damping elements 46 in order to prevent the coupling surfaces 44, 45 of the individual coupling elements 39, 40 from lying hard and directly against one another. A damping element 46 is indicated in dashed lines in the lower right area of the driver ring 25 arranged on the right side.

As further shown in this embodiment, the first coupling elements 39 are each formed as an integral part of the at least one friction wheel 4 on both end faces 31, 32. Since the first coupling elements 39 in the area of both end faces 31, 32 are preferably geometrically identical to one another, the same reference numerals are also used for this. Furthermore, it can also be seen here that the first coupling elements 39 arranged in the region of the first end surface 31 and the likewise first coupling elements 39 arranged in the region of the second end surface 32 are offset or arranged in the circumferential direction. If one of the first coupling elements 39 is located on the first end face 31 of the friction wheel 4, the receiving space 41 is arranged or formed on the opposite end face 32 between two coupling elements 39 spaced apart from one another in the circumferential direction. As a result of this circumferential displacement of the first coupling elements 39, which are formed on both sides, there is no excessive weakening of the friction wheel 4 in the direction of its axial extent. However, a different arrangement of the first coupling elements 39 on the mutually opposite first and second end faces 31, 32 would also be possible. The number of first coupling elements 39 on each of the end faces 31, 32 could also be selected to be different from one another. However, a circumferential offset between the radial mean of first coupling elements 39 on one of the end faces 31, 32 with respect to the radial mean of oppositely arranged receiving spaces 41 or recesses on the other end face 32, 31 could also be provided. Furthermore, the first coupling elements 39 could be arranged on each of the end faces 31, 32 opposite one another in mirror image.

In order to also be able to couple the drive ring or rings 25 with one of the drive shaft parts 23 and / or 24, in this exemplary embodiment, a drive ring 25 is arranged in the axial direction on both sides of the friction wheel 4, with each of the drive rings 25 on the friction wheel 4 facing away coupling elements of the second coupling device 34 are arranged. As already described above, the coupling elements of the second coupling device 34 can be formed by their own cylindrical bolts or pins. The individual coupling elements of each of the second coupling devices 34 are in turn preferably arranged distributed over the circumference. This allows each of the driver rings 25 to be coupled to the respective drive shaft part 23, 24, in particular to be connected in a rotationally fixed manner therewith.

For the sake of order, it should finally be pointed out that, for a better understanding of the structure of the extrusion machine 1 and the friction wheel unit 35, elements of the same have partly been shown to scale and / or enlarged and / or reduced.

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LIST OF REFERENCE NUMBERS

1 Extruder machine 31 first face 2 profile 32 second face 3 extruded material 33 first coupling device 4 friction wheel 34 second coupling device 5 base frame 35 Reibradeinheit 6 The tool holder assembly 36 outer peripheral surface 7 swivel axis 37 inner peripheral surface 8th drive axle 38 longitudinal axis 9 drive unit 39 first coupling element 10 capstan 40 second coupling element 11 locking device 41 accommodation space 12 tool unit 42 Driving ring end face 13 end 43 accommodation space 14 locking device 44 first coupling surface 15 actuator 45 second coupling surface 16 footprint 46 damping element 17 guide surface 18 support surface 19 printing unit 20 pressure element 21 drive shaft 22 clutch 23 first drive shaft part 24 second drive shaft part 25 driver ring 26 first intake opening 27 second intake opening 28 support axle 29 external thread 30 inner thread

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AT 518 237 B1 2019-12-15 Austrian patent office

claims

Claims (8)

1. Friction wheel unit (35) of an extrusion machine (1) comprising - At least one friction wheel (4), which friction wheel (4) has a first end face (31) and a second end face (32) spaced apart in the axial direction thereof as well as an outer peripheral face (36) and an inner peripheral face (37), with between the first end face (31) and the second end face (32) have a longitudinal axis (38), a driver ring (25) arranged on both sides of the friction wheel (4), which driver rings (25) are each arranged in the axial direction directly adjacent to one of the end faces (31, 32) of the at least one friction wheel (4), a respective first clutch device (33) for the positive transmission of a torque from the driver rings (25) arranged on both sides of the friction wheel (4) to the at least one friction wheel (4), characterized in that - that the first coupling devices (33) are each formed by a dog clutch or a spur toothing and the first coupling devices (33) each comprise a plurality of mutually engaging first and second coupling elements (39, 40), - That the first coupling elements (39) are formed as an integral part of the at least one friction wheel (4) on both end faces (31, 32) and in the circumferential direction between immediately adjacent first coupling elements (39) each have a receiving space (41) for one of the second Coupling elements (40) is formed, - That the second coupling elements (40) are formed as an integral part of the two driving rings (25) on each of the friction wheel (4) facing driving ring end face (42), and - That the first coupling elements (39) arranged in the region of the first end face (31) of the friction wheel (4) and the first coupling elements (39) arranged in the region of the second end surface (32) of the friction wheel (4) are staggered in the circumferential direction. 2. Friction wheel unit (35) according to claim 1, characterized in that the first coupling elements (39) extend continuously between the outer peripheral surface (36) and the inner peripheral surface (37) of the at least one friction wheel (4). 3. friction wheel unit (35) according to claim 1 or 2, characterized in that each of the first coupling elements (39) seen in the circumferential direction by a between the outer circumferential surface (36) and the inner circumferential surface (37) extending, formed straight and flat first and second coupling surface (44, 45) is limited. 4. The friction wheel unit (35) according to claim 3, characterized in that the first coupling surface (44) and the second coupling surface (45) are aligned in the radial direction with respect to the longitudinal axis (38). 5. The friction wheel unit (35) according to claim 3, characterized in that the respective first coupling surface (44) and second coupling surface (45) delimiting the receiving space (41) of first coupling elements (39) arranged one behind the other in the circumferential direction are aligned parallel to one another. 6. Friction wheel unit (35) according to one of the preceding claims, characterized in that at least one damping element (46) is arranged between the first and second coupling elements (39, 40) which are directly adjacent and one behind the other in the circumferential direction. 12/17 AT 518 237 B1 2019-12-15 Austrian patent office 7. friction wheel unit (35) according to claim 1, characterized in that on the axially on both sides of the friction wheel (4) arranged driver rings (25) on the side facing away from the friction wheel (4) coupling elements of a second coupling device (34) are arranged. 8. extrusion machine (1) for the continuous production of profiles (2) from a formable extrusion (3), comprising - a base frame (5), - At least one friction wheel unit (35), which friction wheel unit (35) is rotatable about a drive axis (8) and at least one friction wheel (4) and on both sides of the friction wheel (4) each have a driving ring (25), the friction wheel unit (35) with a drive unit (9) is in drive connection, - at least one pressure roller (10), a tool holding device (6), which tool holding device (6) is held on the base frame (5) and seen in the direction of passage of the profile (2) to be produced, the friction wheel (4) being arranged downstream, - At least one tool unit (12), which tool unit (12) is supported on the tool holding device (6), characterized in that the friction wheel unit (35) is designed according to one of the preceding claims.