TOOL CARRIER WITH SPORN WHEELS

Abstract

The present invention relates to a device carrier (1) with at least two spiked wheels (3) rotatable about a common wheel axis (2) and having the following features: The spiked wheels (3) each comprise a rim (9), a tire casing (10) with a tread (11), and spikes (13) arranged on the tread (11). The tire casing (10), together with the rim (9), encloses a gas-filled tire volume which, during intended operation, has a tire pressure greater than the ambient air pressure. The tread (11) forms a plurality of protruding crowns (16). The spikes (13) are each mounted on one of the crowns and have a crown receptacle for this purpose.The crowns and the crown receptacles are each shaped in such a way that when the crown is radially inserted into the crown receptacle, a crown shoulder and a receptacle shoulder come into contact with each other before a crown plateau touches a receptacle base, so that when the respective spike (13) is radially tensioned against the crown, the crown is squeezed against the receptacle shoulder in the area of ​​the crown shoulder, thereby forming a sealing surface and the crown shoulder seals airtight against the receptacle shoulder at the intended tire pressure.

Description

[0001] The present invention relates to an implement carrier, suitable for receiving at least one attachment, with a drive unit and at least two wheels rotatable about a common wheel axis by means of the drive unit.

[0002] An implement carrier is a commercial vehicle primarily used in agriculture or municipal applications. The ability to mount various attachments at the front, rear, or mid-axle allows for a wide range of applications. Implement carriers can be single-axle or multi-axle.

[0003] Single-axle implement carriers often accommodate a finger bar, a double-blade bar, a portal cutter bar, a flail mower, a rotary hay rake, a sweeper, a snow blower, a snow plow, a sweeping brush, a mounted aerator, or a trailer as an attachment. Due to their compact and maneuverable design, single-axle implement carriers are particularly suitable for cultivating smaller meadow areas in mountainous terrain, steep vineyard slopes, or generally steep terrain such as road embankments.

[0004] To improve the traction and off-road capability of the implement carrier on steep slopes, it is common to use so-called spiked rollers as wheels. Such spiked rollers typically feature a metal barrel-shaped roller with conical metal spikes arranged on the running surface. The spikes penetrate the soft ground under the weight of the implement carrier, thus improving the traction and off-road capability of the implement carrier.

[0005] With the aim of improving the smooth running of the implement carrier on paved paths or roads, as well as to improve the grip of the implement carrier on rocky ground on slopes, the use of rubber tires with metal spikes (or rubber spikes) instead of spiked rollers has recently been proposed. The rubber tires of such spiked wheels are typically designed as solid rubber tires. Also known are spiked wheels with rubber tires, which have a tire casing with a gas-filled tire volume that is not hermetically sealed against the atmosphere, but is fluidly connected to the environment, so that during normal operation or in static or continuous load situations, (essentially) ambient pressure is present in the tire volume. The tire volume is typically spanned by a sufficiently strong carcass of the tire casing and prevented from collapsing.Such spiked wheels are referred to below as pressureless spiked wheels.

[0006] Based on this prior art, the present invention is based on the object of providing an implement carrier of the type described above which is characterized by improved practical suitability, in particular with regard to off-road capability, smooth running, weight and ground load.

[0007] This object is achieved by the device carrier according to the invention according to claim 1. Advantageous embodiments emerge from the subclaims.

[0008] The implement carrier according to the invention, suitable for receiving (at least) one attachment, with a drive unit and at least two spiked wheels rotatable about a common wheel axis by means of the drive unit, has the following features: The spiked wheels each comprise a rim, a tire casing with a tread made of an elastically deformable material, and spikes distributed over the tread; the tire casing, together with the rim, encloses a gas-filled tire volume which, during normal operation of the implement carrier, has a specified tire pressure that is greater than the ambient air pressure (in particular, at least 0.1 bar, 0.5 bar, 1.0 bar, 1.5 bar, or 2.0 bar greater than the ambient air pressure); the tread forms a plurality of protruding crowns; the crowns each comprise a crown sidewall, a crown plateau, a crown shoulder, in which the crown sidewall merges into the crown plateau, and an opening extending through the tire casing; the spikes are each mounted on one of the crowns and, for this purpose, have a crown receptacle into which the respective crown can be (at least partially) radially inserted;The crown mounts are each defined by a mount sidewall, a mount base, and a mount shoulder, where the mount sidewall merges into the mount base; the spikes are each fixed to the tire casing by means of a fastening device that penetrates the tire casing through the opening of the respective crown, and are clamped radially against the crown toward the wheel axis (radial clamping of the spikes relative to the corresponding crowns or the tread);the crowns and the crown receptacles are each shaped to match one another in such a way that when the crown is inserted radially into the crown receptacle, the crown shoulder and the receptacle shoulder come into contact with one another before the crown plateau touches the receptacle base, so that when the respective spike is radially braced against the crown, the crown is squeezed (deformed) against the receptacle shoulder in the area of ​​the crown shoulder, whereby a (particularly annular) sealing surface is formed and the crown shoulder seals airtight against the receptacle shoulder at the intended tire pressure. ;

[0009] The invention thus explicitly departs from the previously pursued concept of the pressureless spiked wheel and takes a diametrically different approach with a spiked wheel with a tire volume under excess pressure.

[0010] The invention is based on the finding that the challenges of airtight sealing of a tire volume under overpressure in a spiked wheel can be solved in a particularly reliable and surprisingly simple manner by a synergistic combination of the features according to the invention.

[0011] According to the invention, the airtight seal is specifically created in the shoulder area of ​​the crown and crown mount, which is protected from extreme force and dirt, by means of a relatively small (annular) sealing surface arranged in the shoulder area. This is accompanied by a number of advantages that, when combined, enable reliable and permanent sealing: Firstly, the size of the (annular) sealing surface formed in the shoulder area can be specifically influenced by the design of the shoulder area of ​​the crown and crown recess, thus keeping it relatively small. This allows defined, high contact forces to be achieved between the crown and the crown mount, thus effectively sealing the tire volume from the environment.

[0012] Secondly, the shoulder area, where the annular sealing surface forms, is largely shielded from extreme, external loads that can be caused by the operation of the implement carrier. Particularly on steep slopes with stony ground, it can happen that almost the entire weight force is transferred between the implement carrier and the ground via a single (or a few) spikes. A spike loaded in this way can fold sideways relative to its initial position (especially under tangential loads), thus drastically changing its orientation relative to the running surface. The spike and the connection between the spike and the associated crown are exposed to extreme loads.The "internal" shoulder area of ​​the crown and crown holder is largely shielded from these extreme, external loads, so that the tightness of the (annular) sealing surface arranged there can be ensured even in extreme operating situations.

[0013] Furthermore, the shoulder area is shielded not only from external loads but also from dirt and grime. This prevents dirt and grime from entering the sealing area during operation and adversely affecting its tightness.

[0014] Furthermore, a fundamental concept of the invention is that the crown functions simultaneously as both a sealing body and a gasket. This eliminates the need for a separate sealing body, such as an O-ring, enabling a particularly simple and robust design.

[0015] Through the interaction of the features according to the invention, a device carrier can be realized which is characterized by improved practical suitability.

[0016] The over-inflated tire volume improves the damping properties of the spiked wheel. This allows for smoother running, especially on paved paths and roads. Furthermore, the tire pressure can be adjusted within the tire volume and thus individually adjusted to the weight of the implement carrier and the attachment currently in use.

[0017] Furthermore, the stability of the tool carrier is improved on extreme slopes with rocky ground, as individual spikes yield more easily in the radial direction, thus ensuring a larger number of spikes are in contact with the rocky ground. This prevents the dangerous "slipping" of a tool carrier, which occurs particularly when only a few spikes are in contact with the rocky ground on a slope and then suddenly lose their grip.

[0018] Because the tire volume is pressurized according to the invention, which prevents the tire pressure from collapsing, the tire carcass can be made less massive and more reinforced. This allows the weight of the implement carrier to be reduced, which advantageously reduces the ground load caused by the implement carrier.

[0019] Some features and aspects of the device carrier according to the invention are discussed in detail below.

[0020] The tread and thus also the crowns are made of an elastically deformable material, in particular rubber or synthetic rubber. An elastically deformable material is defined as a material that changes its shape under the application of force and returns to its original shape when the applied force is removed. This essentially reversible change in shape of an elastically deformable material is also referred to herein as deformation or crushing.

[0021] The intended tire pressure prevailing in the tire casing during normal operation of the implement carrier refers to the tire pressure recommended for the implement carrier by the vehicle or tire manufacturer, which typically lies within an interval spanned by a minimum and a maximum pressure. According to the invention, this intended tire pressure, i.e., the recommended tire pressure, is higher than the ambient air pressure, in particular at least 0.1 bar, 0.5 bar, 1.0 bar, 1.5 bar, or 2.0 bar above the ambient air pressure. Thus, there is excess pressure within the tire volume. A permanent airtight seal between the tire volume and the environment is therefore essential.

[0022] The fact that a pressurised tire volume is intended, differentiates the sprocket according to the invention fundamentally from pressureless sprockets. Pressureless sprockets typically have a gas-filled tire volume which is intended to be fluidically connected to the environment. Gas exchange between the tire volume and the environment during normal operation is therefore generally possible and desirable at any time. An airtight seal between the tire volume and the environment is not intended. In load situations, even with a pressureless sprocket, overpressure can briefly build up in the tire volume because pressure equalisation or gas exchange does not take place quickly enough. However, this overpressure is reduced by the fluidic connection between the tire volume and the environment, so that after a while the ambient air pressure prevails in the tire volume again.The intended tire pressure or the recommended tire pressure is therefore identical to the ambient air pressure for a pressureless sprocket wheel.

[0023] According to the invention, the spikes are each fixed to the tire casing by means of a fastening device that penetrates the tire casing through the opening of the respective crown, and is clamped radially against the crown (or against the tread) towards the wheel axis. This is intended to express that after successful assembly (of the respective spike on the respective crown), the respective spike is clamped radially against the respective crown or the tread (radial clamping of the spikes against the associated crowns or the tread). During assembly, the spikes are each placed onto the respective crown in a radial direction with respect to the wheel axis. Conversely, the crowns are inserted into the respective crown receptacles or spikes in a radial direction with respect to the wheel axis (radial insertion of the crown into the crown receptacle).

[0024] The formulation that the crown is squeezed against the receiving shoulder in the area of ​​the crown shoulder expresses that the crown is elastically deformed in the said area.

[0025] It should be expressly pointed out at this point that the crown - if the respective pin is radially clamped to the respective crown or the running surface as intended - can also be in contact with the crown receiver in areas outside the crown shoulder. For example, the crown plateau and the receiver base or the crown side wall and the receiver side wall can also be in contact with each other and form additional sealing surfaces. However, the inventive design of the crown and crown receiver can ensure that the greatest contact forces or the greatest surface pressures between the crown and crown receiver act in the area of ​​the crown shoulder, so that the (annular) sealing surface in the shoulder area of ​​the crown exerts the greatest sealing effect. The (annular) sealing surface in the shoulder area is also referred to as the (annular) contact area.

[0026] Against this background, the last feature of the device carrier according to the invention according to claim 1 can alternatively be formulated as follows: the crown and the crown receptacle are each shaped to match one another in such a way that when the respective spike is radially tensioned against the respective crown, the crown is squeezed against the crown receptacle, forming a surface pressure, and an annular contact area is formed between the crown shoulder and the receptacle shoulder, in which the surface pressure is greater than in the area of ​​the crown plateau and the crown side wall and which seals the crown shoulder against the receptacle shoulder in an airtight manner at the intended tire pressure.

[0027] The surface pressure is the force per contact area between two bodies, in this case in particular between the crown and the crown holder.

[0028] According to a first preferred embodiment of the device carrier according to the invention, the crown shoulder is designed as a radius or a chamfer and the receiving shoulder is designed as a radius or a countersink.

[0029] In this context, a chamfer refers to a beveled surface on an outer workpiece edge, while a countersink refers to a beveled surface on an inner workpiece edge (e.g., in a drilled hole or a blind hole). A radius in this context generally refers to a rounded edge—regardless of whether it is an outer or inner edge.

[0030] In this way, using simple and common manufacturing processes, a defined interaction of crown and crown holder in the respective shoulder areas can be realized by selecting the radius or width and angle of the chamfer or countersink.

[0031] Furthermore, it can preferably be provided that the receiving side wall of the crown receptacle delimits a (substantially) cylindrically shaped region of the crown receptacle.

[0032] Alternatively or additionally, it may be provided that the crown side wall of the crown delimits a (substantially) cylindrically shaped region of the crown.

[0033] This further simplifies the manufacture of the device carrier and, on the other hand, ensures that the (annular) sealing surface is formed in the shoulder area - and not in the area of ​​the receiving side wall of the crown holder or the crown side wall of the crown. For the purposes of this publication, an area is essentially cylindrical in shape even if, in the strict mathematical sense, it is a truncated cone that encloses an angle of less than 10°, in particular less than 5°, between its surface line and its cone axis. Such geometries can be provided as draft angles to facilitate the casting of the spikes or crowns.

[0034] According to a further preferred embodiment of the invention, the spikes each have a spike ring surface surrounding the crown receptacle, which is in contact with a running surface ring surface arranged on the running surface when the respective spike is radially clamped against the respective crown.

[0035] The spike ring surface and the running surface of the sprocket thus lie against each other (when the spike is mounted) and together act as a barrier that prevents or hinders the entry of dirt and grime into the crown retainer. This benefits the long-term sealing of the sprocket.

[0036] The spike ring surface encloses the crown mount and consequently has a larger diameter than the crown mount. The spike thus rests on the running surface over a larger area and with a greater leverage, which advantageously prevents the respective spike from folding sideways under tangential load (to the spike). This has a positive effect on the off-road capability of the tool carrier. Furthermore, this method further reduces external loads on the crown and its shoulder area, which has a positive effect on the seal between the crown and the crown mount.

[0037] It is particularly advantageous that the crowns and the crown receptacles are each shaped in such a way that when one of the crowns is radially inserted into the respective crown receptacle, the crown shoulder and the receptacle shoulder (and optionally the crown plateau and the receptacle base) come into contact with each other before the respective spike ring surface touches the respective running surface ring surface.

[0038] In this way, the greatest surface pressures can be achieved in the shoulder area of ​​the crown mount and crown (and not between the spiked ring surface and the raceway ring surface). This contributes to the permanent tightness of the spiked wheel.

[0039] According to a further advantageous embodiment of the device carrier according to the invention, the fastening devices each comprise a threaded bolt with an external thread, a screw nut with an internal thread corresponding to the external thread and optionally a washer.

[0040] In this way, the respective spike can be easily and reliably clamped to the crown or tread (radially to the wheel axle) and replaced with little effort. The threaded bolt is preferably detachably connected to the spike via an internal thread. To install the spike, first connect the spike to a threaded bolt, and then insert the free end of the threaded bolt through the opening in the crown. A washer and a nut are then placed on the free end of the threaded bolt and tightened with a defined tightening torque.

[0041] Preferably, the screw nut and / or the washer has a larger diameter than the area of ​​the crown delimited by the crown side wall.

[0042] In this way, the shoulder area of ​​the crown can be particularly effectively shielded from extreme external loads.

[0043] According to a further preferred embodiment, the spikes are made of metal, in particular of aluminum, rubber or plastic and / or are conical or pyramid-shaped.

[0044] In order to further improve the smooth running of the implement carrier, according to a further advantageous embodiment the tire casings are designed as radial tire casings.

[0045] A radial tire casing has a carcass with carcass threads that run (essentially) at right angles to the running direction of the tire casing and thus (particularly in the area of ​​the sidewalls of the tire casing) (essentially) radially to the tire axis / wheel axis.

[0046] The applicant expressly reserves the right to claim patent protection for the sprocket wheel (according to a device carrier according to the invention) as such.

[0047] An embodiment of the invention is explained in more detail below with reference to the drawing. Fig. 1 shows a device carrier according to the invention in a perspective oblique view, Fig. 2A-2B shows a sprocket wheel of a device carrier according to the invention in a plan view with mounted spikes ( Fig. 2A ) and without mounted spikes ( Fig. 2B), Fig. 3 shows the sectional view of a spike superimposed with the sectional view of a non-deformed crown, Fig. 4 shows a section of a tire casing of a spiked wheel in a sectional view without mounted spikes, and Fig. 5A-5B shows a section of a spike and adjacent components in a schematic sectional view in the non-mounted state ( Fig. 5A ) and in assembled state ( Fig. 5B ).

[0048] First, with regard to Figure 1 the structure of an embodiment of the device carrier according to the invention is described, while subsequently, in particular with reference to the Figures 2A to 5B Details about the spiked wheel will be explained in more detail.

[0049] Figure 1shows a single-axle implement carrier 1 according to the invention with two spiked wheels 3 rotatable about a common wheel axle 2. The implement carrier 1 has a steering device 4, a drive unit 5, and a front-mounted attachment mount 6. The steering device 4 comprises two handles 7 and several control elements 8, by means of which the implement carrier 1 and any attached attachment can be controlled and operated by an operator.

[0050] The spiked wheels 3 each comprise a rim 9, a tire casing 10 with a tread 11 and two side walls 12, as well as spikes 13 arranged offset on the tread 11.

[0051] The tire casings 10 are designed as radial tire casings. The treads 11 are made of synthetic rubber. Together with the respective rim 9, the respective tire casing 10 encloses a gas-filled tire volume 14, with the (gas) filling or (gas) emptying of the tire volume taking place via a valve device 15 arranged on the respective rim 9. During normal operation of the equipment carrier 1, the tire volume 14 has a tire pressure that is at least 1.0 bar above the ambient pressure (i.e., the atmospheric pressure).

[0052] As particularly in the Figures 2B and 4As can be seen, the running surfaces 11 each form a plurality of crowns 16, which each protrude or protrude beyond the adjacent area of ​​the running surface 11. The crowns 16 each comprise a crown side wall 17 and a crown plateau 18. In a crown shoulder 19 designed as a radius, the crown side wall 17 merges into the respective crown plateau 18 (see also Figure 3 ).

[0053] Furthermore, the crowns 16 each have an opening 20 extending through the tire casing 10. Each crown sidewall 17 defines a (substantially) cylindrically shaped region of the crown 16. Together with the crown plateau 18 and the opening 20, the crown sidewall 17 of a crown 16 defines a (substantially) hollow cylindrical volume. An annular tread surface 21 extends around each crown 16.

[0054] The spikes 13 can each be placed or mounted on one of the crowns 16. The Figures 2A and 5B show crowns 16 with spikes 13 placed or mounted on them, which Figures 2B , 4 and 5A In contrast, crowns 16 without spikes attached or mounted thereon. The spikes 13 are made of aluminum and each have a crown receptacle 22 into which the respective crown 16 can be inserted radially (relative to the wheel axle 2). The crown receptacles 22 are each delimited by a receptacle side wall 23, a receptacle base 24, and a receiving shoulder 25 designed as a countersunk recess, in which the receptacle side wall 23 merges into the receptacle base 24 (cf. Figure 3 ). The receiving side wall 23 delimits a (substantially) cylindrically shaped region of the crown receptacle 22. An annular spiked ring surface 26 extends around the crown receptacles 22 and encloses them.

[0055] The spikes 13 are each conical with a rounded conical tip and are fixed to the tire casing 10 by means of a fastening device 27 and clamped radially towards the wheel axis 2 against the crown 16 (cf. Figures 2A and 3 ). The fastening devices 27 comprise a threaded bolt 28 with an external thread, a screw nut 29 with an internal thread corresponding to the external thread, and a washer 30. The threaded bolts 28 can each be screwed into a corresponding threaded blind hole 31 of a spike 13 and thus detachably connected to a spike 13.

[0056] When mounted, the threaded bolts 28 penetrate the opening 20 of the respective crown 16. By tightening the respective screw nut 29, the respective spike 13 is clamped radially toward the wheel axle 2 against the crown 16. The washer 30 arranged between the screw nut 29 and the tire casing 10 has a larger diameter than the area of ​​the crown 16 delimited by the crown sidewall 17.

[0057] With a view to the Figures 5A and 5BIt becomes clear that the crowns 16 and the crown receptacles 22 are each shaped to match one another in such a way that when the crown 16 is radially inserted into the crown receptacle 22, the crown shoulder 19 (designed as a radius) and the receiving shoulder 25 (designed as a countersink) come into contact with one another before the crown plateau 18 touches the receiving base 24. The crown shoulder 19 designed as a radius therefore first touches the receiving shoulder 25 designed as a countersink when the crown 16 is radially inserted, wherein at this time the crown plateau 18 is still separated from the receiving base 25 by a gap (ie the crown plateau is still spaced from the receiving base).

[0058] This inventive coordinated design of crown 16 and crown holder 22 is also described in Figure 3clearly, since there the sectional view of a spine 13 is shown superimposed with the sectional view of a non-deformed crown 16. In the illustration according to Figure 3 the crown plateau 18 lies in the same plane as the receiving base 24. The width and angle of the depression of the receiving shoulder 25 or the radius of the crown shoulder 18 are coordinated in such a way that in the superimposed representation according to Figure 3 the rounded crown shoulder 18 of the non-deformed crown 16 penetrates the receiving shoulder 25 designed as a countersink.

[0059] The gap between the spike ring surface 26 and the running surface ring surface 21 is illustrated in the superimposed view according to Figure 3that the crown 16 and the crown receptacles 22 are further shaped in such a way that when the crown 16 is radially inserted into the crown receptacle 22, the crown shoulder 19 and the receiving shoulder 25 as well as the crown plateau 18 and the receiving base 24 come into contact with each other before the spike ring surface 26 touches the running surface ring surface.

[0060] If now, as in Figure 5B shown, the crown 16 starting from Figure 5A is introduced further radially into the crown receptacle 22 (until the crown plateau 18 comes into contact with the receptacle base 24 over a large area), the crown 16 deforms in the area of ​​the crown shoulder 19 and adapts to the contour of the receptacle shoulder 25 of the crown receptacle 22.

[0061] In this way, it is achieved that when the respective spike 13 is radially tensioned against the crown 16 (e.g. when the associated screw nut 29 is tightened), the crown 16 is squeezed (deformed) in the area of ​​the crown shoulder 19 against the receiving shoulder 25, whereby an annular sealing surface 32 is formed in the area of ​​the crown shoulder 19 or the receiving shoulder 25 and the crown shoulder 19 seals airtight against the receiving shoulder 25 at the intended tire pressure.

[0062] In the area of ​​the sealing surface 32, a surface pressure is formed which is greater than in the area of ​​the crown plateau 18 and the crown side wall 17.

[0063] Occurring surface pressures are Figure 5B represented by dark areas in the otherwise brightly displayed crown 16 or tread 11. In Figure 5BFor reasons of clarity, the screw nut 29, by means of which the radial tensioning of the pin 13 against the crown 16 takes place, has been omitted. List of reference symbols

[0064] Equipment carrier 1 wheel axle 2 spiked wheel 3 Steering device 4 drive unit 5 Recording 6 handle 7 Controls 8 rim 9 Tire casing 10 Tread 11 side wall 12 Sting 13 Tire volume 14 valve device 15 crown 16 Crown sidewall 17 Crown Plateau 18 crown shoulder 19 breakthrough 20 Tread ring surface 21 Crown images 22 Receiving side wall 23 receiving base 24 receiving shoulder 25 Barbed ring surface 26 Fastening devices 27 threaded bolt 28 screw nut 29 washer 30 threaded blind hole 31 Sealing surface 32

Claims

1. An implement carrier (1) suitable for accommodating (at least) one attachment, comprising a drive unit (5) and at least two spiked wheels (3) rotatable about a common wheel axle (2) by means of the drive unit (5), having the following features: - the spiked wheels (3) each comprise a rim (9), a tire casing (10) with a tread (11) made of an elastically deformable material, and spikes (13) distributed over the tread (11); - the tire casing (10), together with the rim (9), encloses a gas-filled tire volume (14), which, during normal operation of the implement carrier (1), has a specified tire pressure that is greater than the ambient air pressure, in particular at least 0.1 bar, 0.5 bar, 1.0 bar, 1.5 bar, or 2.0 bar greater than the ambient air pressure; - the running surface (11) forms a plurality of protruding crowns (16);- the crowns (16) each comprise a crown side wall (17), a crown plateau (18), a crown shoulder (19), in which the crown side wall (17) merges into the crown plateau (18), and an opening (20) extending through the tire casing (10); - the spikes (13) are each placed on one of the crowns (16) and for this purpose have a crown receptacle (22) into which the respective crown (16) can be at least partially radially inserted; - the crown receptacles (16) are each delimited by a receptacle side wall (23), a receptacle base (24) and a receptacle shoulder (25), in which the receptacle side wall (23) merges into the receptacle base (24); - the spikes (13) are each fixed to the tire casing (10) by means of a fastening device (27) which penetrates the tire casing (10) through the opening (20) of the respective crown (16), and are clamped radially towards the wheel axis (2) against the crown (16);- the crowns (16) and the crown receptacles (22) are each shaped to match one another in such a way that when the crown (16) is inserted radially into the crown receptacle (22), the crown shoulder (19) and the receptacle shoulder (25) come into contact with one another before the crown plateau (18) touches the receptacle base (24), so that when the respective spike (13) is radially braced against the crown (16), the crown (16) is squeezed against the receptacle shoulder (25) in the region of the crown shoulder (19), as a result of which a sealing surface (32), in particular annular, is formed and the crown shoulder (19) forms an airtight seal with respect to the receptacle shoulder (25) at the intended tire pressure; 2. Device carrier (1) according to claim 1, wherein the crown shoulder (19) is designed as a radius or a chamfer and the receiving shoulder (25) is designed as a radius or a countersink.

3. Device carrier (1) according to one of the preceding claims, wherein the receiving side wall (23) of the crown receptacle (22) delimits a substantially cylindrically shaped region of the crown receptacle (22).

4. Device carrier (1) according to one of the preceding claims, wherein the crown side wall (17) of the crown (16) delimits a (substantially) cylindrically shaped region of the crown.

5. Device carrier (1) according to one of the preceding claims, wherein the spikes (13) each have a spike ring surface (26) surrounding the crown receptacle (22) which, when the respective spike (13) is radially clamped against the respective crown (16), is in contact with a running surface ring surface (21) arranged on the running surface (11).

6. Device carrier (1) according to claim 5, wherein the crowns (16) and the crown receptacles (22) are each shaped to match one another in such a way that upon radial insertion of one of the crowns (16) into the respective crown receptacle (22), the crown shoulder (19) and the receiving shoulder (25) come into contact with one another before the respective spike ring surface (26) touches the respective running surface ring surface (21).

7. Device carrier (1) according to one of the preceding claims, wherein the fastening devices each comprise a threaded bolt with an external thread, a screw nut with an internal thread corresponding to the external thread and optionally a washer.

8. Device carrier (1) according to claim 7, wherein the screw nut (29) and / or the washer (30) has a larger diameter than the area of ​​the crown (16) delimited by the crown side wall (17).

9. Device carrier (1) according to one of the preceding claims, wherein the spikes (13) are made of metal, in particular of aluminum, rubber or plastic and / or are conical or pyramid-shaped.

10. Equipment carrier (1) according to one of the preceding claims, wherein the tire casings (10) are designed as radial tire casings.