Device for transmitting exhaust gases between a front and a rear vehicle body of a mobile work machine separated by an articulated swivel joint

Abstract

The invention relates to a device for the transport of exhaust gases between a front vehicle body and a rear vehicle body separated by a hinged swivel joint of a mobile working machine, in particular a tipper, comprising a variable-length pipe section for guiding the exhaust gases, a first flexible hose interacting with a first end region of the pipe section to introduce exhaust gases into the pipe section, and a second flexible hose interacting with a second end region of the pipe section to discharge exhaust gases from the pipe section. It is unique in that a first universal shaft is provided in the first end region, the distal end of which is designed to be rigidly mounted to a fastening section of the front or rear vehicle body of the working machine, and a second universal shaft is provided in the second end region, the distal end of which is designed to be rigidly mounted to a fastening section of the front or rear vehicle body of the working machine, wherein the first hose accommodates the first universal shaft and the second hose accommodates the second universal shaft.

Description

Technical Field

[0001] This invention relates to a device for the transfer of exhaust gas between a front body and a rear body of a mobile construction machine, such as a dump truck, separated by a hinged rotary joint. Background Technology

[0002] Advantageous for certain operational applications is a mobile work machine comprising a front body and a rear body connected to each other via an articulated rotary joint. This configuration is used, for example, in dump trucks, where the cab housing the drive engine of the mobile work machine is located in the front body, while the hopper for receiving the payload is located in the rear body. The steering mechanism of such a mobile work machine may include an articulated steering system, which produces a change in the direction of the mobile work machine by deflecting the front body relative to the rear body using the articulated rotary joint.

[0003] The front and rear vehicle bodies are connected by a hinged rotary joint, allowing the front and rear vehicle bodies to move independently, making the working machinery particularly flexible and maneuverable.

[0004] The problem with existing mobile work machinery using articulated rotary joints is that the drive engine is located in the front or rear of the vehicle body, and the resulting waste heat is often used on other vehicle sections where the drive engine is not located.

[0005] In the case of dump trucks, the waste heat generated by the drive engine is used to heat the hopper so that components of the transported payload do not freeze to the hopper at temperatures below freezing. It is possible that damp soil placed in the hopper can freeze on the hopper, preventing it from being completely emptied during unloading, which degrades transport efficiency.

[0006] According to existing technology, the waste heat generated during the operation of the drive engine is used to heat the hopper, thus avoiding the aforementioned negative effects. Therefore, even at temperatures below 0°C, the hopper can be emptied smoothly because the waste heat from the drive engine is used to heat the area in contact with the payload, preventing some of the payload from freezing.

[0007] Specifically, the waste heat considered is the exhaust gas that drives the engine, which is generated during the operation of an internal combustion engine (such as a diesel engine).

[0008] Establishing a connection between the front and rear bodies of a vehicle to heat the hopper for the heating medium (exhaust gas) is particularly complex. Articulated rotary joints allow for various orientations of the front and rear bodies relative to each other, making known prior art implementations highly complex and prone to wear. Existing exhaust gas transfer devices are typically based on the Kugel-Schalen-Prinzip principle, where, for example, a spherical element with a hole serves as the gas outlet, and a shell surrounding the hole is fitted onto this spherical element, ensuring that the gas connection between the two components is not interrupted even with extensive movement.

[0009] The disadvantage of this connection is its extremely high wear rate, leading to increased maintenance costs. Furthermore, severe damage frequently occurs in the area where the exhaust gas transfer device is located, for example, if the hopper tipps over and the exhaust gas transfer is forcibly separated. In addition, known implementations for exhaust gas transfer in the prior art are complex and have numerous components, making the manufacture of such exhaust gas transfer devices between the front and rear bodies of a vehicle expensive. Summary of the Invention

[0010] The object of the present invention is to provide a device for transferring exhaust gas between a front body and a rear body connected to each other by a hinged rotary joint, which no longer has or at least mitigates the aforementioned problems.

[0011] The objective is achieved by a means for conveying exhaust gases according to one aspect of the invention. Advantageous embodiments of the claimed means may be obtained in other aspects of the invention. Furthermore, a mobile work machine having the claimed means is proposed, which is particularly advantageously modified compared to mobile work machines known in the prior art, in order to achieve the best possible utilization of the means for conveying exhaust gases.

[0012] According to the present invention, an apparatus is provided for transferring exhaust gas between a front body and a rear body of a mobile work machinery, particularly a dump truck, separated by an articulated rotary joint. The apparatus includes: a pipe segment of variable length for guiding the exhaust gas; a first flexible hose that interacts with a first end region of the pipe segment to introduce the exhaust gas into the pipe segment; and a second flexible hose that interacts with a second end region of the pipe segment to discharge the exhaust gas from the pipe segment. The apparatus is characterized in that a first universal joint is provided in the first end region, the distal end of which is designed to be rigidly mounted to a fastening section of the front or rear body of the work machinery; and a second universal joint is provided in the second end region, the distal end of which is designed to be rigidly mounted to a fastening section of the front or rear body of the work machinery, wherein the first hose accommodates the first universal joint, and the second hose accommodates the second universal joint.

[0013] This invention proposes a variable-length pipe segment for an exhaust gas transmission device installed between the front and rear bodies of a mobile work machine via a universal joint. For example, one side of the pipe segment is attached to the front body via a first universal joint, while the other side is attached to the rear body via a second universal joint. To ensure that exhaust gas flows from the front body to the rear body (and vice versa) with minimal leakage, a first flexible hose and a second flexible hose are provided. The first flexible hose connects a first end of the pipe segment to an exhaust gas transmission point on the front body, and the second flexible hose connects a second end of the pipe segment to an exhaust gas transmission point on the rear body. The first hose accommodates the first universal joint, and the second hose accommodates the second universal joint, such that when the exhaust gas transmission device is in the connected state, the exhaust gas guided by the device flows around both the first and second universal joints.

[0014] It can be specified that the first universal joint is rigidly connected to the first end region of the pipe segment, and the second universal joint is rigidly connected to the second end region of the pipe segment, or rigidly arranged at the corresponding end region of the pipe segment.

[0015] According to an improved embodiment of the present invention, the first hose and the second hose may be glass fiber reinforced high-temperature spiral hoses guided around the respective universal joints.

[0016] According to optional variations of the invention, the first universal joint and / or the second universal joint may be a universal joint or universal coupling. In particular, it may be specified that the first axis of the universal coupling or the two axes of one of the two universal joints intersect the hinge axis of the hinge rotation axis.

[0017] According to another improvement of the invention, the variable-length pipe segment comprises two components of different diameters that can be pushed into or pushed out of each other, for example, two metal pipes. Therefore, the variable-length pipe segment may comprise two pipe components connected to each other by means of a telescopic extension. The first pipe component has a first diameter, and the second pipe component has a smaller diameter than the first pipe component, such that the second pipe component can be pushed into and pushed out of the first pipe component.

[0018] Furthermore, it can be specified that pipe segments with larger diameters have stop elements arranged on the inner circumference, particularly circumferential rings, and pipe segments with smaller diameters have stop elements arranged on the outer circumference, particularly circumferential rings, thereby determining the maximum length of the variable-length pipe segments by means of the corresponding stop elements.

[0019] The appropriate stop element ensures that the two pipe components will not easily separate from each other after the maximum length of the pipe section has been reached.

[0020] According to an advantageous modification of the invention, the pipe segment between the first end region and the second end region may include a separation device designed to separate the pipe segment in a controlled manner after the maximum length of the pipe segment has been reached and further force has been applied in the direction of further extension of the pipe segment, such that the first end region and the second end region are no longer connected to each other by a flow channel extending through the pipe segment.

[0021] When the maximum length of the pipe segment has been reached, the separation device will also cause the pipe segment to separate if a corresponding force is applied in the longitudinal direction of the pipe segment. The separation device achieves targeted separation of the pipe segment, thereby preventing severe and potentially irreversible damage to the exhaust gas transmission device that could occur if targeted separation is not possible. Specifically, this can happen if the front body twists particularly violently relative to the rear body, for example, when the rear body carrying the hopper overturns relative to the front body carrying the cab. According to the prior art, this causes an uncontrolled interruption of exhaust gas transmission between the front and rear bodies; therefore, after the overturned rear body is righted, the mobile machinery can only resume smooth operation after being transported to a workshop to repair the damaged exhaust gas transmission device. This limits the operational adaptability of the mobile machinery and its capabilities at the point of use.

[0022] According to an advantageous embodiment of the invention, the separation device has two separation rings that overlap each other in the longitudinal direction of the pipe segment, and the two separation rings separate from each other when a force threshold acting in the longitudinal direction of the pipe segment is exceeded.

[0023] Therefore, two separable rings that engage with each other can be provided, preferably wherein one ring is arranged such that its inner circumference lies on the outer circumference of the other ring. It can be specified that the two separating rings clamp each other, and that the clamping can only be released when a predetermined force is exceeded, the predetermined force acting perpendicularly to the surface formed by the rings.

[0024] Specifically, it can be specified that the first separating ring has a groove on its outer contour or its inner contour, and the second separating ring has a compression spring element to engage in the groove of the first separating ring, wherein preferably, the compression spring element has a ball and a spring element to compress the ball along the direction of the groove of the first separating ring by means of spring force, such that the connection of the two separating rings occurs only if the force pulling the two separating rings apart causes the ball located in the groove to move against the spring tension and causes the ball to slide out of the groove.

[0025] It can also be specified that the separation device can be reassembled after separation by means of a bayonet lock, in particular, wherein the slot has a typical hook shape of a bayonet lock guide, and the compression spring element represents a corresponding locking element to be inserted into the bayonet guide.

[0026] Therefore, the bayonet lock is achieved by a groove in one separating ring and a compression spring element in another separating ring arranged in the groove. Thus, even if the separating device is undesirably separated, the two separated components can be reassembled without tools or access to the workshop. For example, if the rear vehicle with the hopper overturns, the separating device is triggered, preventing damage to the components of the exhaust gas transmission device. After the rear vehicle has been righted, the operator of the mobile machinery can then reassemble the exhaust gas transmission device by hand, without tools.

[0027] According to a further improvement of the invention, the first universal joint and / or the second universal joint may be fastened to the pipe segment by a connector, particularly a star-shaped connector, which extends from the inner circumference of the associated end region. The star-shaped connector is formed by a plurality of webs protruding inwardly on the inner side of the end region and converging at the point where the universal joint extends.

[0028] According to another modification of the invention, the first hose and / or the second hose may be connected to the associated end region by a clamp.

[0029] The use of clamps is simple and has been proven millions of times, making it easy to achieve a durable and proven connection between the hose and the associated end area.

[0030] The present invention also relates to a mobile work machine, particularly an engineering vehicle such as a dump truck, having a front body and a rear body separated from each other by an articulated rotary joint, having an exhaust gas transmission device as described above for conveying exhaust gas between the front body and the rear body separated by the articulated rotary joint, wherein, in particular, the first universal joint or the second universal joint is arranged directly above the articulation axis of the articulated rotary joint.

[0031] Particularly advantageously, the working machinery is designed such that the axis of the hinge joint of the articulated rotary joint intersects with or is aligned with the axis of the first or second universal joint (particularly the universal joint or universal spool). This is advantageous because it completely eliminates the length compensation typically required for the pipe section of the exhaust gas transmission device due to steering movement, which has a highly positive effect on the wear of the exhaust gas transmission device. Therefore, the steering angle of the mobile working machinery caused by the articulation during the transition from the front to the rear of the vehicle body does not cause any length change of the pipe section of the exhaust gas transmission device, thus ensuring that most routine operations of the mobile working machinery do not require length changes of the pipe section that lead to frequent wear.

[0032] Furthermore, according to an improved embodiment of the invention, the first fastening section of the device for discharging exhaust gas to the transmitted exhaust gas has an inclination angle relative to the horizontal plane within the range of 0-35°, preferably 5-30°, and even more preferably 15-25°.

[0033] It can also be specified that the inclination angle of the second fastening section used to receive the exhaust gas from the device for transmitting exhaust gas is in the range of 0-35°, preferably 5-30°, and even more preferably 15-25° relative to the horizontal plane.

[0034] In a further embodiment of the invention, it can be specified that the first fastening section and the second fastening section each have an inclination angle with different signs of inclination relative to the horizontal plane, such that, for example, the first fastening section is deflected by +20° relative to the horizontal plane, and the second fastening section is deflected by -20° relative to the horizontal plane.

[0035] According to a further optional modification of the invention, the first fastening section and / or the second fastening section are both rigidly connected to the associated universal joint via fastening devices, particularly star-shaped connectors, in their end sections facing the device for transmitting the exhaust gas. Attached Figure Description

[0036] Further details, features, and advantages of the invention will become apparent from the following description of the accompanying drawings. The drawings show: Figure 1This is a side view of a mobile work machine, which has a device according to the invention for transferring exhaust gas from the front body to the rear body. Figure 2 This is a side cross-sectional view of a device used for transmitting exhaust gas. Figure 3 A perspective view of a device used for transmitting exhaust gas. Figure 4a This is a perspective view of the device used to transmit exhaust gases when the rear of the vehicle is slightly twisted relative to the front. Figure 4b This is a perspective view of the device used to transmit exhaust gases when the rear of the vehicle body twists relative to the front of the vehicle body. Figure 4c This is a perspective view of the device used to transmit exhaust gases when the rear of the vehicle body twists violently relative to the front of the vehicle body. Figure 5 This is a cross-sectional view of the device used for transmitting exhaust gas, as well as the corresponding fastening sections on the front and rear vehicle bodies. Figure 6 This is a cross-sectional view of a device for transmitting exhaust gas, and of a first hose and a second hose for fluid connection between the front and rear vehicle bodies. Figure 7 This is a top view of the first end region of the pipe segment, where the first hose is connected to the first end region via a clamp. Figure 8 This is a perspective view of the end area of ​​a pipe section having a star-shaped connector for arranging a universal joint. Figure 9a This is a front view of a mobile work machine in the form of a bucket, where the rear body with the bucket is twisted relative to the front body. Figure 9b According to Figure 9a The diagram shows a device for transmitting exhaust gases when the rear of the vehicle body twists relative to the front of the vehicle body. Figure 10 A cross-sectional view of a separation device for non-destructively separating the fluid connection between the front and rear vehicle bodies in a pipe section, and Figure 11 This is an exploded view of the separation device, which can be assembled together using a bayonet lock. Detailed Implementation

[0037] Figure 1A side view of a mobile work machine 100 is shown, which has a device 1 according to the invention for transferring exhaust gas from a front body 3 to a rear body 4. It can be seen that the front body 3 is provided with a cab from which an operator can control the mobile work machine 100. The rear body 4 is hinged to the front body 3 via a hinged rotary joint 2, allowing the mobile work machine 100 to turn by the bending motion of the front body 3 relative to the rear body 4. To accommodate various inclinations of the terrain beneath the front body 3 or the rear body 4, the hinged rotary joint 2 can also be used to twist the front body 3 relative to the rear body 4. The rear body 4 extends horizontally along the axis of rotation relative to the front body 3 and extends in the longitudinal direction of the mobile work machine 100.

[0038] Additionally, a device 1 for transmitting exhaust gas can be seen, which connects the front vehicle body 3 and the rear vehicle body 4. Typically, the exhaust gas is used to heat the hopper 16 arranged on the rear vehicle body 4, so that the goods transported in the hopper will not freeze at low temperatures.

[0039] The drive engine for powering the mobile machinery 100 is arranged on a component of the machinery spaced apart from the hopper 16. In other words, this means, for example, that the hopper 16 is arranged on the rear body 4 and the drive engine is arranged on the front body 3. However, it will be apparent to those skilled in the art that the invention also includes an arrangement of the hopper 16 opposite to that of the drive engine or cab, such that the hopper can also be arranged on the front body 3 and the drive engine on the rear body 4.

[0040] Figure 2 A side cross-sectional view of the device 1 for transmitting exhaust gas is shown, showing that the device 1 for transmitting exhaust gas is arranged between the front vehicle body 3 and the rear vehicle body 4.

[0041] A first universal joint 7a extending toward a first fastening region 8a is attached to the front body 3 in the region of the first end region 8a. The same applies to the rear region of the pipe section 5, wherein a second universal joint 7b extends from the second end region 8b and is then fastened to a second fastening section 9b of the rear body 4.

[0042] Figure 2 The configuration shown does not show the hoses extending between the front vehicle body and pipe segment 5 or between pipe segment 5 and rear vehicle body 4, which surround the respective universal joints 7a, 7b.

[0043] As can be seen, pipe segment 5 comprises two pipe components (e.g., two metal pipes) connected to each other by a telescopic extension. Therefore, there is a first pipe component with a smaller diameter and a second pipe component with a slightly larger diameter, arranged coaxially with it, with the first pipe component inserted into the second pipe component. If a force is now applied that causes the two inserted pipe components to be pulled out, this results in a change in the length of pipe segment 5.

[0044] The maximum length of pipe segment 5 is limited because the nested components of pipe segment 5 all have stop elements 10a and 10b, which abut against each other and prevent the pipe components from being pulled out further when pipe segment 5 is at its maximum length.

[0045] Figure 3 A perspective view of the device 1 for transmitting exhaust gas is shown. In the second end region 8b of the pipe segment 5, a star-shaped connector for fastening the second universal joint 7b can be seen, with the universal joint 7b extending at the center of the star-shaped connector. Those skilled in the art will understand that various possible connection types exist for the universal joints 7a and 7b at their respective end regions of the pipe segment 5; therefore, the illustrated embodiment is only one of many possibilities.

[0046] Figures 4a to 4c Each shows a perspective view of a device for transmitting exhaust gases, wherein the rear vehicle body is twisted relative to the front vehicle body, wherein the twist originates from... Figures 4a to 4c It's getting bigger and bigger.

[0047] Additionally, pipe segment 5 is shown in a transparent manner, revealing that the stop elements 10a and 10b move toward each other until they are in... Figure 4c The two sides are in contact with each other and to prevent further increase in the length of pipe segment 5. The rear body 4 is relative to the front body in Figure 4a Only a slight twist, in Figure 4b A moderate twist, in Figure 4c The tube segment 5 is pulled out to its maximum extension by a strong twist (approximately 38° to 40°). It can also be seen that the angle changes of the corresponding universal joints 7a and 7b required for the corresponding twist of the rear body 4 relative to the front body 3 gradually increase.

[0048] Figure 5 Cross-sectional views of the device 1 for transmitting exhaust gas and corresponding fastening sections 9a and 9b on the front and rear vehicle bodies are shown. On one hand, it can be seen that the exhaust gas is discharged from the front vehicle body 3 at an angle of approximately 20° to the horizontal plane in the region of the first fastening section 9a, which is compensated by a first flexible hose 6a (not shown) connected to a horizontally arranged pipe section 5. It can also be seen that the transmission point to the rear vehicle body 4 is also deflected relative to the horizontal plane, with the amount of deflection precisely corresponding to the angle value present in the exhaust gas emission section on the front vehicle body side.

[0049] This expands the angle of the direction of movement before the orientation of the universal joints 7a and 7b, so that the device 1 according to the invention can easily cover a large range of all possible movements of the front and rear vehicle bodies. It has been found particularly advantageous here that when the mobile work machinery 100 is stationary, there is a bend of substantially the same magnitude in the two universal joints 7a and 7b.

[0050] Additionally, reference numeral 17 indicates the hinge axis of the articulated rotary joint between the front body 3 and the rear body 4. It extends through the universal joint 7A and, in particular, intersects one of the two axes present in the universal joint 7a. If the exhaust gas from the front body is discharged without tilting into the area of ​​the first fastening section 9a, but rather horizontally like the pipe section 5, then the hinge axis 17 of the articulated rotary joint will advantageously align with the axis of the universal joint 7a.

[0051] Figure 6 A cross-sectional view is shown of the device 1 for transmitting exhaust gas and the first flexible hose 6a and the second flexible hose 6b for the transmission point for fluid connection between the front vehicle body 3 and the rear vehicle body 4. It can be seen that the first flexible hose 6a and the second flexible hose 6b each house associated universal joints 7a and 7b within their respective structures.

[0052] Figure 7 The diagram shows a top-view cross-sectional view of the first end region of pipe segment 5, to which the first flexible hose 6a is connected via clamp 18. The performance of the pipe segment is demonstrated when clamped onto the corresponding protrusion by clamp 18.

[0053] Figure 8 A perspective view of the second end region 8b of a pipe segment 5 having a star-shaped connector for arranging the universal joint 7b is shown. It can be seen that multiple segments arranged in a web-like manner protrude inward from the inside of the second end region 8b and converge at the center where the universal joint 7b is attached. It will be apparent to those skilled in the art that various other options exist for connecting the universal joint 7b to the second end region 8b of the pipe segment 5, allowing gas to flow around it.

[0054] Figure 9a A front view of a mobile work machine in the form of a dump truck is shown, in which the rear body with the hopper is twisted relative to the front body. The roll angle of the rear body 4 is approximately 38° compared to the still straight front body 3, and the maximum twist that the device 1 for transporting exhaust gas can compensate for, for example, without separating the pipe section 5 is shown.

[0055] Figure 9b Showing according to Figure 9a The diagram shows the device for transmitting exhaust gas when the rear vehicle body is twisted relative to the front vehicle body, in which pipe segment 5, which has reached its maximum longitudinal extension, can be seen.

[0056] Figure 10A cross-sectional view is shown of a separation device 11 for non-damagingly separating the fluid connection between the front and rear bodies in pipe section 5. The separation device 11 has a first separation ring 12a and a second separation ring 12b, which are operatively connected to each other such that separation of the separation device 11 occurs only when the force required to pull the two pipe components apart is exceeded.

[0057] Therefore, the first separating ring 12a can be surrounded by the second separating ring 12b on its outer circumference, wherein the first separating ring 12a has a groove 12 on its outer side, and the compression spring element 13 of the second separating ring 12b engages in the groove 12. The compression spring element 13 may include a ball 14 that protrudes from the interior of the second separating ring 12b due to the compression spring element 15 and thus engages in the groove 12. This results in the clamping of the two separating rings 12a, 12b, which can only be released when a large force is applied. This occurs because when the two separating rings 12a, 12b are pulled apart, the large force causes the ball 14 to overcome the force applied by the spring element 15, move inward and slide out of the groove 12. This causes the two separating rings 12a, 12b to separate, and the fluid connection established by the pipe segment 5 is broken.

[0058] Figure 11 An exploded view of the separating device 11 is shown, which can be joined together in a bayonet-lock manner. It can be seen that the first separating ring 12a has a groove 12, which has a specific shape and corresponds to a bayonet guide. Therefore, the compression spring element 13 can engage with the guide 19 of the groove 12 in a bayonet-lock manner with its inwardly protruding elastic element (ball 14), and the two separating rings 12a, 12b are thus connected. The advantage of this is that it can be connected without any tools, and can be easily reassembled after being disconnected.

[0059] Furthermore, it may be specified that the first separating ring 12a and / or the second separating ring 12b are provided with handles, which make it easier to assemble the two parts by hand.

[0060] List of reference numerals in the attached diagram: 1. Device for transmitting exhaust gas 2 Hinged Rotary Joint 3 front body 4 Rear Body 5 pipe sections 6a First Flexible Hose 6b Second Flexible Hose 7a First Universal Joint 7b Second Universal Joint 8a First end region 8b Second end region 9a First fastening section (e.g., on the front body) 9b Second fastening section (e.g., on the rear body) 10a First stop element 10b Second Stop Element 11 Separation Device 12a First Separation Ring 12b Second Separation Ring 12 slots 13 Compression Spring Elements 14 goals 15 Spring Elements 16 hoppers 17. Rotation axis of the hinged rotary joint 18 clamps 19-Gate Guide 100 mobile operating machines.

Claims

1. A device (1) for transferring exhaust gas between a front body (3) and a rear body (4) of a mobile work machine (100) separated by an articulated rotary joint (2), the device comprising: A pipe section (5) of variable length is used to guide exhaust gas. A first flexible hose (6a) interacts with a first end region of the pipe segment (5) to introduce exhaust gas into the pipe segment (5), and A second flexible hose (6b) interacts with the second end region of the pipe segment (5) to discharge exhaust gas from the pipe segment (5). Its features are, A first universal joint (7a) is provided in the first end region (8a), and the distal end of the first universal joint is designed to be rigidly mounted to a fastening section (9a; 9b) of the front body (3) or rear body (4) of the working machine (100), and A second universal joint (7b) is provided in the second end region (8b), the distal end of the second universal joint being designed to be rigidly mounted to a fastening section (9a; 9b) of the front body (3) or rear body (4) of the working machine (100), wherein The first flexible hose (6a) accommodates the first universal joint (7a), and the second flexible hose (6b) accommodates the second universal joint (7b). The pipe segment (5) between the first end region (8a) and the second end region (8b) includes a separation device (11) designed to separate the pipe segment (5) after reaching its maximum length and after applying further force in the direction of further extension of the pipe segment (5), such that the first end region (8a) and the second end region (8b) are no longer connected to each other by a flow channel extending through the pipe segment (5).

2. The device (1) according to claim 1, wherein the first universal joint (7a) and / or the second universal joint (7b) are universal joints or universal couplings.

3. The device (1) according to any one of the preceding claims, wherein the variable length tube segment (5) comprises two metal tubes of different diameters capable of being pushed into or pushed out of each other.

4. The device (1) according to claim 3, wherein the metal tube with a smaller diameter has a stop element (10a) arranged on the outer circumference and the metal tube with a larger diameter has a stop element (10b) arranged on the inner circumference, thereby determining the maximum length of the variable length tube segment (5) by means of the corresponding stop elements (10a, 10b).

5. The device (1) according to claim 4, wherein the stop element (10a) arranged on the outer circumference is a circumferential ring, and the stop element (10b) arranged on the inner circumference is a circumferential ring.

6. The device (1) according to claim 1, wherein the separation device (11) has two separation rings (12a, 12b) that overlap each other in the longitudinal direction of the pipe segment (5) and that separate from each other when a force threshold acting in the longitudinal direction of the pipe segment (5) is exceeded.

7. The apparatus (1) according to claim 6, wherein the first separating ring (12a) of the two separating rings has a groove (12) on its outer contour or its inner contour, and the second separating ring (12b) of the two separating rings has a compression spring element (13) to engage in the groove (12) of the first separating ring (12a), wherein the compression spring element (13) has a ball (14) and a spring element (15) to compress the ball (14) along the direction of the groove (12) of the first separating ring (12a) by means of spring force, such that the connection of the two separating rings (12a, 12b) occurs only if the force pulling the two separating rings (12a, 12b) apart causes the ball (14) located in the groove (12) to move against the spring tension and causes the ball (14) to slide out of the groove (12).

8. The device (1) according to claim 7, wherein the separating device (11) can be reassembled after being separated by the bayonet lock, wherein the slot (12) has a typical hook shape of the bayonet guide of the bayonet lock, and the compression spring element (13) represents a corresponding locking element to be inserted into the bayonet guide.

9. The device (1) according to claim 1, wherein the first universal joint (7a) and / or the second universal joint (7b) are fastened to the pipe segment (5) by a connector extending from the inner circumference of the associated end regions (8a, 8b).

10. The device (1) according to claim 9, wherein the connector is a star-shaped connector.

11. The device (1) according to claim 1, wherein the first flexible hose (6a) and / or the second flexible hose (6b) are connected to the associated end regions (8a, 8b) by clamps.

12. The device (1) according to claim 1, wherein the mobile operating machinery (100) is a dump truck.

13. A mobile work machine (100) having a front body and a rear body (4) separated from each other by a hinged rotary joint (2), having means for conveying exhaust gas according to any one of the preceding claims to convey exhaust gas between the front body and the rear body (4) separated by the hinged rotary joint (2), wherein a first universal joint (7a) or a second universal joint (7b) is arranged directly above the hinge axis of the hinged rotary joint (2).

14. The mobile work machinery (100) according to claim 13, wherein the first fastening section of the device for discharging exhaust gas to the exhaust gas transmission device has an inclination angle relative to the horizontal plane in the range of 0-35°.

15. The mobile work machinery (100) according to claim 14, wherein the first fastening section of the device for discharging exhaust gas to the exhaust gas transmission device has an inclination angle of 5-30° relative to the horizontal plane.

16. The mobile work machinery (100) according to claim 14, wherein the first fastening section of the device for discharging exhaust gas to the exhaust gas transmission device has an inclination angle of 15-25° relative to the horizontal plane.

17. The mobile work machinery (100) according to claim 14, wherein the second fastening section for receiving exhaust gas from the exhaust gas transmission device has an inclination angle relative to the horizontal plane in the range of 0-35°.

18. The mobile work machinery (100) according to claim 17, wherein the second fastening section for receiving exhaust gas from the device for transmitting exhaust gas has an inclination angle relative to the horizontal plane in the range of 5-30°.

19. The mobile work machinery (100) according to claim 17, wherein the second fastening section for receiving exhaust gas from the exhaust gas transmission device has an inclination angle relative to the horizontal plane in the range of 15-25°.

20. The mobile operating machinery (100) according to claim 17, wherein the first fastening section and the second fastening section each have tilt angles with different signs of inclination relative to the horizontal plane, such that, for example, the first fastening section is deflected by +20° relative to the horizontal plane, and the second fastening section is deflected by -20° relative to the horizontal plane.

21. The mobile work machinery (100) according to claim 17, wherein the first fastening section and / or the second fastening section are both rigidly connected to the associated universal joint (7a, 7b) via fastening devices in their end sections facing the device for transmitting the exhaust gas.

22. The mobile work machinery (100) according to claim 21, wherein the fastening device is a star-shaped connector.

23. The mobile work machinery (100) according to claim 13, wherein the mobile work machinery (100) is an engineering vehicle.

24. The mobile work machinery (100) according to claim 23, wherein the mobile work machinery (100) is a dump truck.

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