Gear, method for producing a gear and use of such a gear

Abstract

The invention relates to a gear, having a reference diameter of greater than or equal to 1.5 m, with a gear hub and a gear rim, which gear is characterised in that the gear hub and gear rim are releasably connected to one another and that the gear hub consists of a plurality of elements that are welded together.

Description

[0001] Page 1 / 35 Applicant: SMS group GmbH Our reference: P80726WO November 7, 2023 Gearwheel, method for producing a gearwheel and use of such a gearwheel The invention relates to a gearwheel with a pitch circle diameter of greater than or equal to 1.5 m. The invention further relates to a method for producing a gearwheel with a pitch circle diameter of greater than or equal to 1.5 m. The invention also relates to a use of a gearwheel. Generic gearwheels are known from the prior art. As a rule, gearwheels of this dimension are designed as castings with toothing machined on the circumference. The object of the invention is to provide an improvement or an alternative to the prior art. The object underlying the present invention is achieved by a gearwheel with the features of claim 1.Advantageous embodiments of the gear are described in the claims dependent on claim 1. More specifically, according to a first aspect of the invention, the object is achieved by a gear with a pitch circle diameter of Page 2 / 35 P80726WO greater than or equal to 1.5 m, comprising a gear hub and a gear rim, wherein the gear is characterized in that the gear hub and the gear rim are detachably connected to one another and the gear hub consists of a plurality of elements welded together. In other words, a two-part gear is proposed here, the gear hub of which is based on a welded construction. The inventive design of the present gear enables particularly cost-effective production, even of larger gears with a pitch circle diameter of 1.5 m or greater.This is particularly advantageous with regard to the manufacturing costs and, in particular, the operating costs of a press and / or punching device, such as a drop forge or similar, since these can also be significantly reduced. In particular, gears of this type in such press and / or punching devices are generally subject to high levels of labor, which, on the one hand, significantly reduces their operating times with regard to external circumferential gearing and / or, on the other hand, often causes irreparable damage to their external circumferential gearing due to critical load peaks. Critical load peaks, in particular, frequently occur on press and / or punching devices in the form of shock loads in connection with pressing and / or punching operations and ultimately affect the gears of the drives of such press and / or punching devices.Page 3 / 35 P80726WO Furthermore, gears dimensioned in this way are usually subject to larger tolerances with regard to their outer peripheral toothing, in particular tolerances in the shape of the toothing of several tenths of a millimeter. The present separately manufactured gear rims can, however, be manufactured with significantly smaller tolerances, whereby peak loads can be further advantageously reduced or better absorbed due to the resulting lower play compared to counter gears. The gear according to the invention can therefore be used particularly advantageously in particular on a press and / or punching device in order to be able to use the effects and advantages explained here on such a press and / or punching device. In this respect, according to a further aspect of the invention, the invention also relates to a press and / or punching device for pressing orPunching, in particular, metallic semi-finished products and / or semi-finished products made of non-ferrous metals, such as slabs, billets, forging blanks, or the like, with a drive device and a ram part driven thereby, wherein the press and / or punching device is specifically further characterized by a gear according to one of the features described here. It is understood that the present invention can be particularly advantageously applied to gears with pitch circle diameters of greater than or equal to 2.0 m, 2.5 m, 2.8 m, and 3 m. Furthermore, the gear preferably has a pitch circle diameter of greater than or equal to 3.5 m, preferably greater than or equal to 4.0 m, and particularly preferably greater than or equal to 4.5 m.Likewise preferably, the gearwheel has a pitch circle diameter of greater than or equal to 5.0 m, furthermore preferably a pitch circle diameter of greater than or equal to 5.5 m, preferably greater than or equal to 6.0 m, and particularly preferably greater than or equal to 6.5 m. Generic gearwheels with such dimensioned pitch circle diameters are often manufactured as a single-piece cast construction, with an outer circumferential toothing then being produced by machining. The larger the pitch circle diameter, the more casting material can be saved with the gearwheel constructed according to the invention, which, on the one hand, can further reduce manufacturing costs.The gear preferably has a pitch circle diameter of less than or equal to 7.0 m, further preferably a pitch circle diameter of less than or equal to 6.0 m, preferably a pitch circle diameter of less than or equal to 5.0 m and particularly preferably a pitch circle diameter of less than or equal to 4.0 m or less or a pitch circle diameter of less than or equal to 3.0 m. On the other hand, the gear design proposed here, in particular with regard to the welded design of the gear hub, can reduce the overall CO2 emissions associated with the production of the gear. This saving in CO2 emissions can advantageously be further increased if the complete replacement of an entire gear can be dispensed with and, if necessary, only the gear rim needs to be replaced, for example over the life cycle of a press and / or punching device.Furthermore, this welded construction is less prone to defects than cast constructions, for example, which are often unusable or require costly repair due to critical defects in the cast material, such as unwanted material inclusions, blowholes, or the like. Furthermore, it is advantageous in this case that a more cost-effective and / or readily available material can be used for the gear hub than is required for the gear rim, particularly one with lower material properties. This is generally not possible with a cast construction, since the hub, and not just the teeth, is made of a uniform material, with the material requirements for the entire gear usually being determined by the gear rim. For example, in this case it is not absolutely necessary for the gear hub to be made of heat-treatable steel.The term "gear hub" in the sense of the invention describes any structural areas of the gear or components thereof that are arranged substantially radially further inward of the gear rim. In this case, the gear hub is designed as a separate component of the gear with respect to the gear rim and is therefore fixedly but detachably arranged on the gear rim. The gear hub can be designed in different ways, although only initial possible structural designs for the gear hub are mentioned here as examples. For example, the gear hub can have different bearing seats on its inner diameter. For example, it is possible for the gear hub to have two corresponding bearing seats that are configured to implement an adjusted bearing arrangement.Page 6 / 35 P80726WO Alternatively, the gear hub can also have a fixed shaft-hub connection, which in turn can be designed in particular as a cylindrical interference fit and / or conical interference fit. Furthermore, the gear hub can also be provided for a positive shaft-hub connection, in particular for a connection by means of a feather key, cylindrical pin, wedge, expanding dowel connection and / or the like. The term "gear rim" in the present case describes an annular component of the gear according to the invention, which is arranged as a separate component essentially radially further outwards on the gear hub, fixedly but detachably. The gear rim is preferably designed as a closed, circumferential ring component, which, among other things, can significantly improve the dimensional stability of the gear rim. In any case, the gear hub and the gear rim are fixedly but detachably connected to one another.This enables cost-effective repair of the gear, for example by removing a worn or damaged gear rim from the gear hub and replacing it with a new or overhauled gear rim. In other words, this means that the gear hub and the gear rim have a reversible connection. This allows the gear hub and the gear rim to be not only easily joined together, but also easily separated. Preferably, the gear hub and the gear rim can be separated from one another without causing damage, so that the gear hub and / or the gear rim can be reused if necessary, for example after repair, maintenance, and / or modernization. In this respect, it is advantageous if the gear has a connecting device by means of which the gear hub and the gear rim can be firmly but detachably connected to one another.This connecting device is preferably different from a materially bonded connection between the gear hub and the gear rim, which significantly increases the chances of a non-destructive removal of the connection between the gear hub and the gear rim. Frictional or force-locking connections as well as form-locking connections are advantageous here, since in the sense of the invention they can, on the one hand, act well between the gear hub and the gear rim, and on the other hand, can also be easily removed again. The connecting device can be constructed in different ways. The connecting device preferably comprises a plurality of connecting elements which enable a reversible connection between the gear hub and the gear rim. It is advantageous if the connecting elements can be removed non-destructively. This enables a quick separation of the gear hub and the gear rim.Ideally, the connecting elements can be at least partially reused, which can further reduce costs. The following terminology should also be explained: Page 8 / 35 P80726WO It should be expressly pointed out that in the context of this patent application, indefinite articles and numerical expressions such as “one”, “two”, etc. are generally to be understood as “at least” expressions, i.e. as “at least one…”, “at least two…”, etc., unless it is expressly clear from the respective context or it is obvious or technically necessary for the person skilled in the art that only “exactly one…”, “exactly two…”, etc. can be meant. In the context of this patent application, the expression “in particular” should always be understood to mean an optional, preferred feature. The expression is not to be understood as “and namely” or “namely”.It is particularly advantageous that the present gear can be constructed modularly due to the design separation of the gear hub and gear rim. For example, it is possible, on the one hand, to equip the gear hub with differently designed gear rims. In this respect, identical or similarly designed gear hubs can be manufactured industrially in a first production step and, in a subsequent production step, equipped or connected with a gear rim that carries a desired or required toothing. On the other hand, it is possible to select differently designed gear hubs for identical gear rims, which, for example, allows for additional scalability. Furthermore, it is expedient if the gear rim has herringbone gearing, double helical gearing, or spur gearing.Page 9 / 35 P80726WO Herringbone gearing, for example, promotes particularly smooth running and / or self-centering with regard to intermeshing tooth elements. In this respect, it is particularly advantageous, in connection with a press and / or punching device, if the gear rim has herringbone gearing. Double helical gearing, for example, is cheaper to manufacture and also has a self-centering effect. Such double helical gearing can be viewed as a two-part gearing or herringbone gearing, in which the "tip of the arrow" is missing. Straight gearing, for example, is even cheaper to manufacture. In any case, with regard to the gear in question, the gear hub can easily be equipped with a wide variety of gear rims, which in turn are characterized by different toothings.A favorable design variant provides that the elements of the gear hub comprise a structural steel in accordance with DIN EN 10025, preferably an S235 structural steel and particularly preferably an S355 structural steel, in particular a fine-grain structural steel in accordance with DIN EN 10025, preferably an S460. A structural steel in accordance with DIN EN 10025 is particularly favorable and in this respect the manufacturing costs of the gear, in particular of the gear hub, can be further reduced. The gear hub is preferably made from an S235 structural steel, at least predominantly. As a rule, an S235 structural steel is very readily available and can still be procured comparatively inexpensively. Page 10 / 35 P80726WO The gear hub is particularly preferably made from an S355 structural steel, at least predominantly. In addition to being readily available, an S355 structural steel has more advantageous material properties, which can have a favorable effect on the use of the present gear.Fine-grain structural steels can also be advantageously used to manufacture the gear hub. For example, a fine-grain structural steel according to DIN EN 10025 has good welding properties. Fine-grain structural steel of grade S460 is preferably used here, as this fine-grain structural steel is also readily available. It goes without saying that other materials are also suitable for manufacturing this gear hub. For example, a quenched and tempered steel 25CrNiMo6 has very good strength and is still easy to weld. It goes without saying that the gear rim can also be made from a wide variety of materials. It is also particularly expedient if the gear rim is made from a quenched and tempered steel according to DIN EN 10083 or from a case-hardened steel according to DIN EN 10084 or from a nitrided steel according to DIN EN 10085.If the gear rim is made from a heat-treatable steel in accordance with DIN EN 10083, the gear rim can be characterized by good strength. With a case-hardening steel in accordance with DIN EN 10084, the gear rim can be given improved wear resistance. Page 11 / 35 P80726WO An even further improved surface hardness can be achieved on the gear rim with a nitriding steel in accordance with DIN EN 10085. As a rule, components made from case-hardening or nitriding steels are also characterized by a tougher "component core" and a harder "component surface". Furthermore, it is advantageous if the gear rim has a chromium content of greater than or equal to 1.05%, preferably a chromium content of greater than or equal to 1.1%, and particularly preferably a chromium content of greater than or equal to 1.3%.Chromium content in a steel material results in chromium carbides, which in turn result in greater hardness, which can lead to improved wear resistance and higher temperature resistance. A gear rim with a chromium content of greater than or equal to 1.05%, for example, can be realized using the material 25CrMo4. Conversely, a gear rim with a chromium content of greater than or equal to 1.1% can be realized using the material 42CrMo4. For example, using the material 34CrNiMo6, a chromium content of greater than or equal to 1.3% can be achieved on the gear rim, which gives the gear rim, for example, very good surface strength.Further improved material properties can be achieved on the gear ring if the gear ring has a manganese content of greater than or equal to 0.5%, preferably a manganese content of greater than or equal to 0.7%, and particularly preferably a manganese content of greater than or equal to 0.75%. The alloying component manganese not only improves forgeability, but also weldability, general strength, and wear resistance. In addition, the alloying component manganese reduces the tendency of a correspondingly alloyed steel to red fracture. Good weldability is particularly advantageous with regard to repair welds. For example, the material 34CrNiMo6 can be used to provide a gear ring with a manganese content of greater than or equal to 0.5%. A manganese content of greater than or equal to 0.7% in the gear ring can be achieved using the material 25CrMo4.A manganese content of greater than or equal to 0.77% in the gear rim can, for example, be achieved using the material 42CrMo4. In any case, with the present gear, the gear hub and the gear rim can be easily manufactured from different materials. In particular, it is advantageous if the material of the gear hub and the gear rim can be selected depending on the respective component function or component load to be fulfilled. The gear, in particular its gear hub, can advantageously be connected to other components if the gear hub Page 13 / 35 P80726WO has a coupling receptacle, in particular a coupling receptacle designed as a machined flat surface, wherein the coupling receptacle preferably has a bolt circle. If the gear hub has a coupling receptacle designed as a machined flat surface, the gear as a whole can be equipped with a particularly precise seating surface.If the clutch receptacle also has a bolt circle, the clutch receptacle can advantageously be arranged on other components of the gear hub. It is advantageous in this case if, as a rule, a cast clutch housing can be screwed on, in which case, for example, a counter surface for a friction pair of a clutch is formed in the clutch housing. The friction pair is usually designed to be radially symmetrical. Alternatively, however, a machined surface can also be provided, which can form a corresponding friction pair directly with a clutch disc. Furthermore, it is advantageous if the gear hub has at least one flank with a material thickness of greater than or equal to 15 mm, preferably greater than or equal to 20 mm, particularly preferably greater than or equal to 30 mm.The gear hub preferably has at least one flank with a material thickness of greater than or equal to 25 mm, preferably a material thickness of greater than or equal to 35 mm and particularly preferably a material thickness of greater than or equal to 45 mm. Alternatively, a gear hub as a single-strut, thick-walled sheet steel design with a protruding wall thickness of one flank is also possible, wherein a base body does not have a box-shaped design, but consists of only one flank. As a rule, a base body of the gear hub is welded as a box. In other words, the gear hub preferably has a frame part welded together in a box-like manner. The gear hub produced in this way can have a first and a second disc-shaped flank as well as internal ribs for connecting these flanks.A first, thicker flank of the flanks can serve as a contact surface for a clutch housing or, for example, for a direct clutch friction pair. A second flank (usually the thinner flank) of the flanks can also typically have circular holes or other shaped recesses through which access to the interior of the box is provided, for example for creating the weld seams. If the gear rim is shrunk onto the gear hub, a frictional connection between the gear rim and the gear hub can be created in a simple design. Such an interference fit offers an extremely robust solution for attaching the gear rim to the gear hub. This can counteract any distortion of the gear rim, in particular tilting of one side of the gear rim, for example, particularly through rigidity in this area emanating from the gear hub.Page 15 / 35 P80726WO Furthermore, a connection between the gear hub and the gear rim can be realized even more securely if the gear hub and the gear rim are connected to one another by means of at least one fitting bolt, preferably with at least three fitting bolts and particularly preferably with at least five fitting bolts. The connection between the gear rim and the gear hub preferably has more than or equal to seven fitting bolts, preferably more than or equal to 11 fitting bolts and particularly preferably more than or equal to 15 fitting bolts. The term “fitting bolt” in the sense of the invention describes an elongated bolt element with both a relatively thick and a relatively short body. Generic fitting bolts are often also referred to as dowel pins or the like. In this case, the fitting bolt preferably has a suitably large cross-sectional area so that the fitting bolt thereby has a reliable shear resistance.Furthermore, in this context, it is advantageous if at least one fitting bolt generates only a low surface pressure, even when high forces and / or torques are to be transmitted. Cross-sectional areas of the fitting bolts with values ​​greater than or equal to 314.16 mm are advantageous. 2 (r = 10 mm), preferably greater than or equal to 706.86 mm 2 (r = 15 mm) or particularly preferably greater than or equal to 1256.64 mm 2 (r = 20 mm). Using cross-sectional areas selected in this way, sufficiently dimensioned fitting bolts can be provided along the circumferential direction of the gear, which can ensure sufficient anti-rotation protection between the gear hub and the gear rim. Preferably, a fitting bolt has a cross-sectional area greater than or equal to 1963.50 mm 2 (r = 25 mm), preferably greater than Page 16 / 35 P80726WO or equal to 2827.43 mm 2(r = 30 mm) and particularly preferably greater than or equal to 3848.46 mm 2 (r = 35 mm). A sufficiently high number of fitting bolts can still be provided in the circumferential direction of the gear if the fitting bolts have cross-sectional areas with values ​​of less than or equal to 3848.46 mm 2 (r = 35 mm), preferably less than or equal to 2827.43 mm 2 (r = 30 mm) or particularly preferably less than or equal to 1963.50 mm 2(r = 25 mm). Fitting bolts of this type are known from the prior art and are therefore not described in more detail here with regard to their structural design and function. The gear rim can be particularly well secured to the gear hub if the gear rim has a shoulder in an inwardly directed region, wherein the gear hub and the gear rim are operatively connected to one another by means of the shoulder by means of at least one expansion screw, preferably with at least three expansion screws and particularly preferably with at least five expansion screws. Preferably, the connection between the gear rim and the gear hub has more than or equal to seven expansion screws, preferably more than or equal to 11 expansion screws and particularly preferably more than or equal to 15 expansion screws. Advantageously, the radially inwardly extending shoulder can serve as a support for a screw head of the at least one expansion screw and / or theProvision of an internal thread and thus the reception of an external thread of the expansion screw. For example, this also allows axial forces between the gear rim and the gear hub to be easily absorbed. In particular, a high preload force for the screw connection can be achieved using an expansion screw. This can ensure that axial operating forces only exert a lower additional load on the expansion screw connection. In particular, the high preload force made possible by expansion screws can ensure that a larger part of the axially occurring loads is already absorbed by the components involved and does not have to be absorbed for the most part by the screw connection. Expansion screws of this type are known from the prior art and are therefore not described further here with regard to their design and function. AThe expansion screw used as a connecting means in this case has a comparatively long and slender screw section, which extends threadlessly between a screw head and a screw thread base, whereby a particularly high preload force of the connecting means can be achieved. A high preload force advantageously leads to a robust connection between the shoulder and the gear hub on the one hand, and to a low tendency for loosening on the other. In any case, it should be explicitly emphasized again at this point that a combination of different connecting means or connecting elements is advantageous, since each connecting means or connecting element has its own advantages. In particular, corresponding connecting means constellations are advantageous. By means of a cylindrical interference fit, for example, a large-area radially acting friction or force-lock connection can advantageously be achieved over the entire circumferential surface of the gear hub.18 / 35 P80726WO can be provided, whereby a good anti-rotation protection can be ensured with regard to the gear rim and the gear hub. A cylindrical interference fit between the gear hub and the gear rim can be joined and / or released by a temperature difference between the gear hub and the gear rim, so that a cylindrical interference fit is also considered a detachable connection within the scope of this aspect. Alternatively, to release a cylindrical interference fit between the gear hub and the gear rim, one or more channels can be provided in the gear hub, in particular bores which extend in the direction of the connecting surface between the gear hub and the gear rim and which are designed to exert a radial force on the gear rim by means of fluid pressure in the channel, so that it can be released from the gear hub. Furthermore, a positive connection can advantageously be achieved between theGear rim and the gear hub. This allows load peaks acting on the gear rim in particular to be well absorbed and transferred to the gear hub, thus preventing the risk of a frictional or force-locking connection established between the gear rim and the gear hub being overcome and / or slipping due to critical load peaks. Expansion bolts allow the gear rim and the gear hub to be axially clamped together in a more targeted manner. Overall, an advantageous connection device can be realized on the gear using various, ideally complementary, connecting means. Page 19 / 35 P80726WO A further advantageous embodiment provides for the gear to have an acceleration sensor. If such an acceleration sensor is configured to detect operating vibrations of the gear, the function or conditionof the gear during operation, virtually "on-the-fly," particularly during the operation of press and / or punching devices. Ideally, an inspection of the gearing condition can be carried out cost-effectively using commercially available sensors, particularly during a maintenance run with the gear assembled, for example with regard to a press and / or punching device. In particular, a frequency density spectrum of the acceleration sensor signal makes it possible to detect whether the gear is damaged, or whether a connecting means or a connecting element is no longer functioning properly, particularly via a corresponding peak in the frequency density spectrum and / or a change in a eigenmode of the gear. The object underlying the present invention is further achieved by a method for a gear with the features of claim 13. Advantageous embodiments of the method-are described in the claims dependent on claim 13. More specifically, the object is achieved according to a second aspect of the invention by a method for producing a gear with a pitch diameter greater than or equal to 1.5 m, with a gear hub and with a gear rim, in which the gear hub is produced by means of a welded construction, in which the gear rim is produced by means of a closed, circumferential ring part, and in which the gear hub and the gear rim are subsequently firmly but detachably connected to one another by means of a force-fit or frictional connection and / or by means of a fitting bolt connection and / or by means of an expansion screw connection. By means of such a method, gears of considerable size or with considerably large pitch diameters can be produced particularly simply and inexpensively, as already explained many times above. It is particularly advantageous ifSuitable fitting bolt connections and / or expansion screw connections are arranged between an external toothing of the gear and a friction or force-locking connection, whereby the fixed, but detachable connection between the gear hub and the gear rim can be realized particularly compactly on the gear. In this respect, a preferred method variant provides that bores are made in the gear for the fitting bolt connection and / or for the expansion screw connection between the pitch circle of the gear and the friction or force-locking connection. At this point, it should also be claimed that the described method can also be supplemented by further technical features described here, in particular by features of the device, in order to advantageously further develop it or to be able to represent or formulate method specifications even more precisely. The object underlying the present invention is furtherby using a gear with the features of claim 15. Page 21 / 35 P80726WO More specifically, the object is achieved according to a third aspect of the invention by using a gear according to one of the features described here. In particular, the use of the proposed gear in connection with press and / or punching devices is extremely advantageous, since operating and maintenance costs can be significantly reduced. Furthermore, the use of the present gear as a replacement part or spare part is particularly advantageous, since the gear according to the invention represents an extremely inexpensive alternative to an original gear of a processing machine, such as press and / or punching devices for processing metallic semi-finished products and / or semi-finished products made of non-ferrous metals, in particular for gears with a pitch diameter of greater than or equal to 1.5 m and especially with even largerPitch circle blades, such as 4 m or 5 m. Furthermore, according to a further aspect of the invention, the use of a gear rim, in particular in the form of a closed ring part, for producing the gear underlying the invention, especially on a multi-part gear with a pitch circle diameter of greater than or equal to 1.5 m, is also advantageous, as this allows particularly large gears to be manufactured more cost-effectively than before, yet still robustly. The advantage of the circumferentially closed ring part lies, among other things, in the fact that the gear rim can be positioned much more precisely on the gear hub than, for example, a band-shaped toothing that is circumferentially placed around the gear hub. Page 22 / 35 P80726WO It is expressly pointed out that the objects of the respective aspects of the invention can be advantageously combined, both individually or in any combination.cumulative. Further advantages, details and features of the invention emerge below from the explained exemplary embodiments. In detail: Figure 1: schematically shows a front view of a gear with a gear hub and with a gear rim, wherein the gear hub and the gear rim are firmly but detachably connected to one another; Figure 2: schematically shows a first perspective view of the gear shown in Figure 1; Figure 3: schematically shows a further perspective view of the gear shown in Figures 1 and 2; Figure 4: schematically shows a side view of the gear hub of the gear shown in Figures 1 to 3 without a gear rim; Figure 5: schematically shows a first perspective view of the gear rim of the gear shown in Figures 1 to 3 without a gear hub; Figure 6: schematically shows a further perspective view of the gear rim shown in Figure 5; Page 23 / 35 P80726WO Figure 7: schematically a sectioned partial viewa fitting bolt connection of a detachable connecting device of the gear shown in Figures 1 to 3; and Figure 8: schematically shows a sectional partial view of an expansion screw connection of a detachable connecting device of the gear shown in Figures 1 to 3. In the following description, the same reference numerals designate the same components or the same features, so that a description given with reference to one figure regarding a component also applies to the other figures, thus avoiding repetitive description. Furthermore, individual features that were described in connection with one embodiment can also be used separately in other embodiments. The gear 1 shown as a whole in Figures 1 to 3 has a gear hub 2 (see in particular also Figure 4) and a gear rim 3 (see in particular also Figures 5 and 6), which are detachably but firmly connected to one another. The gear 1 featuresIn this exemplary embodiment, it is also characterized by a pitch circle diameter 5 of 2 m running in the circumferential direction 4 of the gear 1. The gear 1 also has an axis of rotation 6, around which the gear 1 rotates when used properly. As is particularly clearly visible in the illustration in Figure 4, the gear 1 has an axial extension in the axial direction 8 and a radial extension in the radial directions 9. Page 24 / 35 P80726WO The gear 1 is designed as a cost-effective spare or replacement part for often very expensive original gears, but it can also be used ex works as an original equipment part of a brand-new processing machine. Furthermore, the gear hub 2 is designed as a welded construction and comprises a plurality of elements 7 welded together (only generally numbered here), as will be explained in more detail later. In this embodiment, the gear hub 2 isWelded construction made of fine-grain structural steel of grade S460, while the gear rim 3 is made of 42CrMo4. It goes without saying that the materials of the gear hub 2 and gear rim 3 can be individually selected depending on the application of the gear 1. Because the gear hub 2 and the gear rim 3 are firmly connected to one another in the assembled state, thereby forming the gear 1 as a whole, and the gear hub 2 and the gear rim 3 are also detachable from one another, the gear hub 2 and the gear rim 3 can be manufactured very effectively with optimized functionality, be it in terms of the most favorable material selection or the most favorable manufacturing process or machining, or similar. In this respect, the gear 1 is characterized by a modular design, whereby the gear hub 2 and gear rim 3 are designed depending on the designated application area of ​​the gear 1selected and can be joined together. Page 25 / 35 P80726WO In this exemplary embodiment, the gear hub 2 and the gear rim 3 are designed for use on a forging press 10 (not shown in detail here) and are optimized in such a way that, on the one hand, the gear rim 3 can withstand particularly shock loads well and, on the other hand, the gear hub 2 is reusable should the gear rim 3 need to be replaced due to wear or stress damage. The forging press 10 is in turn integrated as a processing station (not numbered again here) in a forging line 11 for processing metallic semi-finished products and / or semi-finished products made of non-ferrous metals, in particular forging blanks. In other words, the gear 1 is a component of the forging press 10 of a forging line 11. In this respect, the gear 1 belongs to a rolling mill (not shown here). Furthermore, theIn this embodiment, the gear hub 2 also features a clutch receptacle 12 with a machined flat surface 13 to compensate for any distortion caused by welding processes during the manufacture of the gear hub 2. Therefore, the clutch receptacle 12 can be used to precisely attach add-on parts not shown here, such as a clutch housing (not shown) or the like, to the gear hub 2. The clutch receptacle 12 also has a bolt circle 14, by means of which the clutch receptacle 12 itself can be attached to the gear hub 2. As a welded construction, the gear hub 2 has a box-like welded frame part 15, wherein it can be clearly seen, in particular according to the illustrations in Figures 7 and 8, that the box-like welded frame part 15 has at least a first disc-shaped flank element 15A and a second disc-shaped flank element 15B,which are welded together by means of intermediate rib elements 15C, whereby here (Figures 7 and 8) only one radially outer rib element 15C can be seen, which is designed as a ring element 15C at this outer position. Here, the coupling receptacle 12 described above is attached to the first disc-shaped flank element 15A, whereas the second disc-shaped flank element 15B primarily serves only to further stiffen the box-like welded frame part 15 and thus also the gear hub 2 as a whole. In this respect, the second disc-shaped flank element 15B also has a smaller component thickness (not explicitly specified) of 25 mm, while the first disc-shaped flank element 15A has a greater component thickness (also not explicitly specified) of 45 mm. Furthermore, the second disc-shaped flank element 15B has a plurality of recesses 16 which provide access to theThe frame or box interior 17 of the gear hub 2 is easily accessible, allowing high-quality welding work to be carried out there as well. Further radially inward, the gear hub 2 also has a bearing shell part 18 for supporting a shaft part (not shown), so that the gear 1 can rotate about the rotation axis 6. As can be clearly seen, particularly in the illustration according to Figure 4, the gear hub 2 has a radial outer circumferential surface 20 further radially outward, which is designed as a frictional contact outer surface 21 for supporting the gear rim 3. Page 27 / 35 P80726WO The radial outer circumferential surface 20 in its entirety is formed by the welded elements 7 "first and second disc-shaped flank element 15A and 15B" and "rib or ring element 15C", while the frictional contact outer surface 21 in this embodiment is provided only by the second disc-shaped flank element 15B and the rib or ring element 15C.As can be seen particularly clearly from the illustrations in Figures 5 and 6, the gear rim 3 has a circumferentially closed ring part 22, which here is designed as a shrink ring (not separately numbered again). In this exemplary embodiment, the gear rim 3 has herringbone toothing 25, which is arranged on the radially outer surface of the gear rim 3. Radially further inward, the gear rim 3 has an inner frictional contact surface 26, by means of which the gear rim 3 forms a frictional connection with the outer frictional contact surface 21 of the gear hub 2. The gear rim 3 has a shoulder 27 which is arranged radially further inward with respect to the herringbone toothing 25 and extends in the circumferential direction 4 of the gear 1. The shoulder 27 essentially has a vertically extending contact surface 27A in the form of an inwardly directed area (not numbered again) for axial contact of the firstdisc-shaped flank part 15A. The gear 1 has a multi-acting connecting device 28 for releasably but firmly connecting the gear hub 2 and the gear rim 3. Page 28 / 35 P80726WO In this exemplary embodiment, the multi-acting connecting device 28 comprises a frictional or force-locking connection 29 (see in particular Figures 7 and 8), a fitting bolt connection 30 (see in particular Figure 7), and an expansion screw connection 31 (see in particular Figure 8). The three connections 29, 30, and 31 can alternatively be combined differently, depending on the intended use or load-bearing capacity of the gear 1. The frictional or force-locking connection 29 is characterized in particular by a press-shrink fit 33 comprising the friction contact outer surface 21 on the gear hub 2 on the one hand and the friction contact inner surface 26 of the gear rim 3 on the other hand. According to the illustration in FigureThe fitting bolt connection 30 is clearly visible in Figure 7. The fitting bolt connection 30 essentially comprises a blind hole 35 extending in the axial direction 8 into the gear rim 3, a through hole 36 extending in the axial direction 8 through the first disk-shaped flank element 15A, a fitting bolt 38 seated therein, and a fitting bolt loss prevention device 39. The expansion screw connection 31 is clearly visible in the illustration in Figure 8. The expansion screw connection 31 essentially comprises a threaded blind hole 42 extending in the axial direction 8 into the gear wheel 3, a threaded through-hole 43 extending in the axial direction 8 through the first disc-shaped flank element 15A, an expansion screw 44 screwed therein and a lock nut part 45. As can be clearly seen in particular from the illustrations in Figures 1 and 2, fitting bolt connections 30 and expansion screw connections 31 are arranged along theArranged alternately on the gear 1 as seen in the circumferential direction 4. Page 29 / 35 P80726WO Here, both the fitting bolt connections 30 and the expansion screw connections 31 are arranged between the toothing or the herringbone toothing 25 and the friction or force-locking connection 29, whereby a particularly compact connecting device 28 is realized on the gear 1. The fitting bolt connections 30 and the expansion screw connections 31 are arranged radially further outward than the friction or force-locking connection 29 on the gear 1. Furthermore, the gear 1 also has at least one acceleration sensor 46 in order to be able to detect signs of wear or damage to the gear rim 3, in particular to the herringbone toothing 25, at an early stage, before signs of wear or damage prove to be critical.

[0002] Page 30 / 35 P80726WO List of reference symbols 1 Gear 2 Gear hub 3 Gear rim 4 Circumferential direction 5 Pitch circle diameter 6 Axis of rotation 7 Welded elements 8 Axial direction 9 Radial directions 10 Forging press 11 Forging line 12 Clutch receptacle 13 Plane surface 14 Bolt circle 15 Box-like welded frame part 15A First disc-shaped flank element 15B Second disc-shaped flank element 15C Rib or ring element 16 Recesses or holes 17 Frame or box interior 18 Bearing shell part 20 Radial outer circumferential surface 21 Friction contact outer surface 22 Circumferentially closed ring part 25 Herringbone toothing 26 Friction contact inner surface 27 Shoulder or inwardly directed area 27A Contact surface 28 Connecting device 29 Friction orForce-lock connection 30 Fitting bolt connection 31 Expansion screw connection 33 Press-shrink fit Page 31 / 35 P80726WO 35 Blind hole 36 Through hole 38 Fitting bolt 39 Fitting bolt loss protection 42 Threaded blind hole 43 Threaded through hole 45 Lock nut part 46 Acceleration sensor.

Claims

Page 32 / 35 P80726WO Patent claims 1. Gear (1) with a pitch circle diameter (5) of greater than or equal to 1.5 m, comprising: - a gear hub (2), and - a gear rim (3), characterized in that the gear hub (2) and the gear rim (3) are detachably connected to one another, the gear hub (2) consisting of a plurality of elements (7, 15, 15A, 15B, 15C) welded to one another.

2. Gear (1) according to claim 1, characterized in that the gear rim (3) has a herringbone toothing (25) or a double helical toothing or a straight toothing.

3. Gear (1) according to one of claims 1 or 2, characterized in that the elements (7) of the gear hub (2) comprise a structural steel according to DIN EN 10025, preferably an S235 structural steel and particularly preferably an S355 structural steel, in particular a fine-grain structural steel according to DIN EN 10025, preferably an S460. 4.Gear (1) according to one of the preceding claims, characterized in that the gear rim (3) is made of a heat-treatable steel according to DIN EN 10083 or of a case-hardening steel according to DIN EN 10084 or of a nitriding steel according to DIN EN 10085.

5. Gear (1) according to one of the preceding claims, characterized in that the gear rim (3) has a chromium content of greater than or equal to 1.05%, preferably a chromium content of greater than or equal to 1.1% and particularly preferably a chromium content of greater than or equal to 1.3%. Page 33 / 35 P80726WO 6. Gear (1) according to one of the preceding claims, characterized in that the gear rim (3) has a manganese content of greater than or equal to 0.5%, preferably a manganese content of greater than or equal to 0.7% and particularly preferably a manganese content of greater than or equal to 0.75%.

7. Gear (1) according to one of the preceding claims, characterized in that the gear hub (2) has a clutch receptacle (12), in particular a clutch receptacle (12) designed as a turned flat surface (13), wherein the clutch receptacle (12) preferably has a bolt circle (14).

8. Gear (1) according to one of the preceding claims, characterized in that the gear hub (2) has at least one flank (15A, 15B) with a material thickness of greater than or equal to 15 mm, preferably a material thickness of greater than or equal to 20 mm, and particularly preferably a material thickness of greater than or equal to 30 mm. 9.Gear (1) according to one of the preceding claims, characterized in that the gear rim (3) is shrunk onto the gear hub (2).

10. Gear (1) according to one of the preceding claims, characterized in that the gear hub (2) and the gear rim (3) are connected to one another by means of at least one fitting bolt (38), preferably with at least three fitting bolts (38) and particularly preferably with at least five fitting bolts (38).

11. Gear (1) according to one of the preceding claims, characterized in that the gear rim (3) has a shoulder (27) in an inwardly directed region (27A), wherein the gear hub (2) and the gear rim (3) are operatively connected to the shoulder (27) by means of at least one expansion screw (44). Page 34 / 35 P80726WO are connected to one another, preferably with at least three expansion screws (44) and particularly preferably with at least five expansion screws (44).

12. Gear (1) according to one of the preceding claims, characterized in that the gear (1) has an acceleration sensor (46).

13. A method for producing a gear (1) with a pitch diameter (5) of greater than or equal to 1.5 m, with a gear hub (2) and with a gear rim (3), in which the gear hub (2) is produced by means of a welded construction, in which the gear rim (3) is produced by means of a closed circumferential ring part (22), and in which the gear hub (2) and the gear rim (3) are subsequently firmly but detachably connected to one another by means of a force-locking connection (29) and / or by means of a fitting bolt connection (30) and / or by means of an expansion screw connection (31).Method according to claim 13, characterized in that bores (35, 36) are introduced into the gear (1) for the fitting bolt connection (30) and / or for the expansion screw connection (31) between the pitch circle of the gear (1) and the friction or force-lock connection (29).

15. Use of a gear (1) according to one of claims 1 to 12, in particular for a press and / or a punching device.

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