Waste gas system for a construction machine

Abstract

The machine (100) has an exhaust system (1) comprising an engine compartment (2) that is provided with an engine bonnet (3). An exhaust outlet (6) is provided in the engine bonnet and fluidically aligned with an exhaust pipe (4). The exhaust pipe is provided as an exhaust vent (7) in the engine bonnet for outlet of waste heat from an engine (101). The exhaust outlet and the exhaust vent are configured such that exhaust airstream emitted from the exhaust vent spreads effluent gases from the exhaust outlet to keep-out of the effluent gases from operators.

Description

[0001] The present invention relates to a road paver or a feeder.

[0002] In road construction, pavers and material feeders are used to create paved surfaces. Commonly used pavers and material feeders are powered by an internal combustion engine. The exhaust gases from the engine are expelled through a long exhaust pipe at the height of the driver's cab to keep them away from the operator. The exhaust pipe is typically mounted on a muffler, which, along with the muffler, is vertically attached to the engine hood in front of the operator's platform.

[0003] The problem is that the exhaust pipe and the associated silencer obstruct the view of the operator on the control panel. Furthermore, the outward-facing exhaust pipe and silencer are exposed to all weather conditions, which often leads to damage to the exhaust pipe and silencer due to rust.

[0004] Furthermore, in practice, road pavers and material feeders are known to have exhaust pipes that can be attached or folded down on the engine hood of the construction machine. Consequently, for transporting the road paver on a low-loader, the exhaust pipe can be removed or folded down in such a way that the required transport height is maintained.

[0005] However, in practice, despite the attachable or foldable exhaust tailpipe, it has been found that such movable devices are easily damaged. Often, the exhaust tailpipe or silencer is so badly rusted that removal or folding by the operator is difficult or impossible. Furthermore, a detachable or foldable exhaust tailpipe is relatively expensive, and its installation requires additional expertise to ensure proper exhaust emission.

[0006] FR 2 170 753 A5 describes an exhaust system located under the engine hood of a construction machine. The exhaust system comprises an engine from which an exhaust pipe extends towards a finned opening. The exhaust pipe includes a curved end that directs the exhaust gases from the engine into the opening, so that the exhaust gases, along with a cooling airflow generated by a fan and a radiator, exit the opening.

[0007] US Patent 5,228,530 A relates to a lawn tractor whose power unit is located under a hood behind the driver's seat. The power unit comprises an engine from which exhaust gases are routed through an exhaust pipe and a muffler to an exhaust port with an exhaust grille. The exhaust gases exit the power unit through a section of exhaust pipe and are then carried out through the exhaust port with the grille by a cooling airflow generated by a radiator and a fan.

[0008] US Patent 4,872,308 A relates to a working machine with a drive unit that includes a muffler. The muffler is cooled by compressed cooling air generated by a fan, thus reducing the risk of fire in the engine compartment. A mixing chamber is located above an exhaust outlet for the muffler to mix the exhaust gases flowing from the muffler with cooling air and direct them to an exhaust vent in the engine hood.

[0009] US 2008 / 0115989 A1 discloses an exhaust system of a bus, the diesel engine of which is arranged in an engine compartment in a rear part of the bus and is connected to an exhaust aftertreatment system arranged in a chimney chamber outside the engine compartment, wherein exhaust gases and waste heat from the engine are released to the environment of the bus above the roof via openings provided in the roof of the bus.

[0010] The invention is based on the objective of improving a construction machine by means of simple design features in such a way that exhaust fumes from the construction machine can be kept away from the operating personnel.

[0011] This problem is solved by the technical features of claim 1. Improved embodiments of the invention are given by the technical features of the dependent claims.

[0012] In this invention, the exhaust pipe is not located on the hood of the construction machine. In contrast, in this invention, the exhaust pipe is located in the engine compartment, with the exhaust pipe ending under the hood.

[0013] Because the exhaust pipe in this invention terminates under the engine hood, the operator has improved visibility while operating the construction machine. Furthermore, the exhaust pipe is protected from dirt and adverse weather conditions under the hood, thus improving its functionality and extending its service life. Additionally, the exhaust pipe, located in the engine compartment, is not at risk of damage during transport. Moreover, complex and expensive folding or plug-in devices for the exhaust pipe are unnecessary.

[0014] Preferably, the exhaust pipe includes at least one exhaust outlet nozzle, which directs the exhaust flow and also terminates under the engine hood. A limited and controlled quantity of exhaust gases can leave the engine compartment of the construction machine through the exhaust outlet nozzle.

[0015] The invention provides an exhaust outlet opening in the engine hood, which is flow-optimized in relation to the exhaust pipe, in particular the exhaust outlet nozzle. The exhaust outlet opening provided in the engine hood ensures the unimpeded escape of combustion gases through the hood.

[0016] In a suitable embodiment, the exhaust outlet nozzle or exhaust pipe opens into the exhaust outlet opening. This ensures that the exhaust gases flowing from the exhaust pipe or exhaust outlet nozzle are completely directed into the exhaust outlet opening.

[0017] According to the invention, at least one exhaust opening is provided in the engine hood to dissipate waste heat from the engine. This prevents the engine from overheating and being damaged as a result.

[0018] In the invention, the at least one exhaust air opening comprises flow ribs to give an outgoing exhaust air stream an outflow direction.

[0019] Preferably, the exhaust gas outlet is located next to the exhaust air opening. This ensures that the exhaust gas flow is directed into the exhaust air flow, thereby enabling efficient removal of the exhaust gases from the construction machine.

[0020] In another embodiment, the exhaust system includes at least one cooling fan, which is intended for cooling the engine.

[0021] It is also advantageous if the cooling fan has a speed control.

[0022] Sufficient cooling airflow is achieved when the cooling fan does not fall below a minimum speed.

[0023] According to the invention, an airflow produced by the cooling fan is provided for the removal of engine heat, wherein the airflow heated by the engine heat forms an exhaust airflow from the cooling fan to carry away the combustion gases of the engine. Upon exiting the exhaust airflow from the exhaust opening formed in the engine hood, the exhaust airflow meets the exhaust gas flow from the exhaust outlet opening, surrounds and dilutes it, and directs it away from the exhaust outlet opening and away from the operating personnel.

[0024] Preferably, a diffuser is provided that can be used to dilute and cool the combustion gases. The diffuser allows the exhaust gases to expand and cool immediately after exiting the combustion engine, thus preventing excessive heating of the exhaust pipe. Furthermore, the diffuser improves the dissipation of generated engine heat, and the cooled exhaust gases released by the diffuser do not unnecessarily raise the ambient temperature of the construction machine's engine.

[0025] It is also advantageous if the exhaust pipe is connected to an exhaust aftertreatment system. This system widens and slows the exhaust flow and reduces its vibrations. The exhaust aftertreatment system can include a particulate filter, a catalytic converter, a silencer, etc.

[0026] To reduce noise emissions from the exhaust system, the exhaust aftertreatment device is preferably located in the engine compartment of the construction machine. This also makes it possible to protect the exhaust aftertreatment device from adverse weather conditions.

[0027] The invention is explained with reference to the following figures, wherein Figure 1 an embodiment according to the invention, comprising an arrangement according to the invention of an exhaust air opening with flow ribs and an exhaust gas outlet opening as described in paragraphs

[0034] and

[0035] , and Figure 2 The illustration shows a motor arrangement used for the invention.

[0028] The Figure 1 Figure 1 shows a section of a construction machine 100, which includes an exhaust system 1 according to the invention. The construction machine 100 is in particular a road paver or a feeder.

[0029] The exhaust system 1 has an engine compartment 2 with a hood 3. An internal combustion engine 101 for powering the construction machine is located in the engine compartment 2. An exhaust pipe 4 is positioned in the engine compartment 2, under the hood 3. The exhaust pipe 4 extends upwards to an upper surface of the hood 3, but does not protrude from the hood 3.

[0030] Exhaust outlet nozzles 5 are provided at one upper end of the exhaust pipe 4, which determine the direction of the exhaust flow as it exits the exhaust system. The exhaust outlet nozzles 5 are arranged side by side, but can also be arranged in any other configuration on the exhaust pipe 4. Furthermore, the exhaust outlet nozzles 5 can have different diameters or different heights.

[0031] The Figure 1This also shows that an exhaust outlet opening 6 is provided in the engine hood 3, which is flow-optimized in relation to the exhaust pipe 4 or, in this case, to the exhaust outlet nozzle 5. The exhaust outlet opening 6 is shaped in such a way that an exhaust flow is directed forward away from the engine hood 3 and therefore also away from the operating personnel.

[0032] Also from the Figure 1 It can be inferred that the exhaust outlet nozzles 5 open into the exhaust outlet opening 6. Although it is evident from the Figure 1 If not shown, it is possible that the exhaust outlet nozzles 5 protrude into the exhaust outlet opening 6 over a certain length without protruding significantly from the engine hood 3.

[0033] Furthermore, the engine hood 3 features an exhaust opening 7, which is fluidically connected to a cooling fan 102. The cooling fan 102 transports the waste heat from the engine 101 to the exhaust opening 7, where the cooling airflow exits the engine compartment 2 as exhaust air. The exhaust opening 7 occupies a larger area of ​​the engine hood 3 than the exhaust outlet 6. The exhaust outlet 6 is located in a lower left area of ​​the exhaust opening 7.

[0034] As through the Figure 1 As shown, the exhaust opening 7 has flow ribs 8 arranged parallel within the exhaust opening 7. The flow ribs 8 assume an inclined position to direct the exhaust airflow forward away from the hood 3.

[0035] The exhaust outlet opening 6 is located along two sides of the exhaust air opening 7, with the exhaust outlet opening 6 being positioned in front of and beside some flow fins 8, so that when the exhaust air stream exits the exhaust air opening 7, it carries the exhaust gas stream coming from the exhaust outlet opening 6 forward away from the engine hood 3. It is also provided that the exhaust air stream guided by the upper flow fins 8 flows out above the exhaust outlet opening 6, thereby covering the exhaust gases exiting the exhaust outlet opening 6 and keeping the exhaust gases away from the operating personnel.

[0036] Furthermore, an exhaust aftertreatment device 9 is flanged to the exhaust pipe 4. The exhaust aftertreatment device 9 is located inside the engine compartment 2, below the engine hood 3. Together with the exhaust pipe 4, the exhaust aftertreatment device 9, which includes, for example, a particulate filter, a catalytic converter, a silencer, etc., ensures optimal removal of the combustion gases from the combustion engine.

[0037] Figure 2 Figure 200 shows an engine arrangement 200, as it can be used for a construction machine 100 according to the invention. In addition to the one shown in Figure 200, the engine arrangement 200 is shown. Figure 1 The illustrated embodiment shows the Figure 2 a diffuser 103, which is connected to the exhaust aftertreatment device 9 via the exhaust pipe 4. The diffuser 103 is designed to dilute and cool the combustion gases. Although the engine arrangement 200 of the Figure 2 The diffuser, which is not shown installed in engine compartment 2, is, according to the invention, fluidically connected to the one in Figure 1 The exhaust outlet opening 6 shown is aligned and does not protrude from it.

Claims

1. Road finishing machine or charger comprising: an exhaust gas system (1) having an engine compartment (2) with an engine hood (3), and an exhaust gas pipe (4) which carries off combustion gases from the engine (101) of the road finishing machine or the charger (100), wherein the exhaust gas pipe (4) is mounted in the engine compartment (2), characterized in that the exhaust gas pipe (4) ends underneath the engine hood (3), wherein an exhaust gas outlet opening (6) is provided in the engine hood (3), which is oriented fluidically with the exhaust gas pipe (4), and wherein at least one hot air opening (7) is provided in the engine hood (3) for the outlet of heated air of the engine (101), the at least one hot air opening (7) comprises flow fins (8) in order to provide an outflowing flow of heated air with a flowout direction, wherein the flow fins (8) are arranged in parallel in the hot air opening (7) and adopt an inclined position in order to conduct the heated air flow forwards, away from the engine hood (3), wherein the exhaust gas outlet opening (6) is adjacent along two sides of the hot air opening (7), wherein the exhaust gas outlet opening (6) is arranged in front of and next to some flow fins (8) so that the hot air flow carries the exhaust gas flow flowing out of the exhaust gas opening (6) forwards, away from the engine hood (3), as it flows out of the hot air opening (7), and that the exhaust gas outlet opening (6) and the hot air opening (7) are configured such that a hot air flow from the hot air opening (7) and conducted by upper flow fins (8) is flowing out above of the exhaust gas outlet opening (6), thereby covering the exhaust gases flowing out of the exhaust gas outlet opening (6), in order to keep the exhaust gas away from the operating staff.

2. Road finishing machine or charger according to claim 1, characterized in that the exhaust gas pipe (4) comprises at least one exhaust gas outlet port (5) which provides the exhaust gas flow with a flowout direction and ends underneath the engine hood (3).

3. Road finishing machine or charger according to claim 2, characterized in that the exhaust gas outlet opening (6) is oriented fluidically with the exhaust gas outlet port (5).

4. Road finishing machine or charger according to claim 2 and 3, characterized in that the exhaust gas outlet port (5) or the exhaust gas pipe (4) end in the exhaust gas outlet opening (6).

5. Road finishing machine or charger according to one of the previous claims, characterized in that the exhaust gas outlet opening (6) is arranged next to the hot air opening (7) so as to conduct the exhaust gas flow into the heated air flow.

6. Road finishing machine or charger according to one of previous claims, characterized by at least one cooling fan (102) which is provided to cool the engine (101).

7. Road finishing machine or charger according to claim 6, characterized in that the cooling fan (102) is speed-controlled so as to ensure a sufficient cooling capacity.

8. Road finishing machine or charger according to claim 6 or 7, characterized in that the cooling fan (102) does not fall below a minimum speed.

9. Road finishing machine or charger according to one of claims 6 to 8, characterized in that an air flow produced by the cooling fan (102) is provided to carry off the engine heat, wherein the air flow from the cooling fan (102), heated by the engine heat, forms an heated air flow for carrying off the combustion gases of the engine (101).

10. Road finishing machine or charger according to one of the previous claims, characterized by a diffuser (103) which is provided to dilute and cool the combustion gases.

11. Road finishing machine or charger according to one of the previous claims, characterized by an exhaust gas aftertreatment device (9) which is connected to the exhaust gas pipe (4).

12. Road finishing machine or charger according to claim 11, characterized in that the exhaust gas aftertreatment device (9) is mounted in the engine compartment (2) of the building machine (100).

13. Road finishing machine or charger according to one of the previous claims, characterized in that in terms of the surface area, the hot air opening (7) covers a greater part of the surface of the engine hood (3) than the exhaust gas outlet opening (6).

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