Truck provided with a device for lowering the temperature of exhaust gas

1. An exhaust system comprising a muffler and a diffuser for lowering the temperature of exhaust gas of a combustion engine, wherein the diffuser comprises a housing having a cylinder wall and first and second end walls, an inlet opening in one of the first and second end walls, and an elongated outlet opening in the cylinder wall, extending in an axial direction of the housing, the outlet opening being larger than the inlet opening, wherein the diffuser further comprises an inlet tube extending parallel to the cylinder wall within the housing, wherein the inlet tube has one end connected to the inlet opening and comprises a tube wall perforated with holes, and wherein a length side of the elongated outlet opening is adjacent a bent wall and is configured to provide an outflow direction of the exhaust gas parallel to the bent wall, wherein the bent wall is one of (i) a part of a downwardly facing side of the muffler and and (ii) formed by a bent guide plate attached to the housing of the diffuser on a side of the housing opposite which suction openings are present to allow ambient air to flow into the housing for mixing with the exhaust gas near the outlet opening.

2. A truck comprising a combustion engine and the exhaust system of claim 1 for combustion gases, wherein the elongated outlet opening faces a side of the truck and is configured to discharge the exhaust gas on the side of the truck in a direction orthogonal to a direction of motion of the truck.

3. The truck according to claim 2 , wherein the bent guide plate comprises ribs which extend at right angles to the outlet opening.

4. The truck according to claim 3 , wherein side edges of the bent guide plate are flanged over at right angles, such that they guide the exhaust gas.

5. The truck according to claim 2 , wherein the other of the first and second end walls is closed.

6. The truck according to claim 5 , wherein the outlet opening extends over a greater part of the length of the cylinder wall.

7. The truck according to claim 2 , wherein at least one partition is positioned in the housing and is parallel to the first and second end walls, and wherein the at least one partition includes an opening through which the inlet tube extends.

8. The exhaust gas system of claim 1 , wherein the side of the housing of the diffuser to which the bent guide plate is attached is the length side of the outlet opening, whereby the bent guide plate is configured to provide an outflow direction from the outlet opening parallel to the bent guide plate and create a Coanda effect, and wherein the suction openings are adjacent a second length side of the outlet opening, opposite the length side of the outlet opening to which the bent guide plate is attached.

9. The exhaust gas system of claim 8 , wherein the bent guide plate comprises ribs, including both centrally disposed ribs and peripherally disposed ribs, which extend at right angles to the outlet opening.

10. The exhaust gas system of claim 9 , wherein side edges of the bent guide plate are flanged over at right angles, such that they guide the exhaust gas.

11. The exhaust gas system of claim 1 , wherein the outlet opening extends over a greater part of the length of the cylinder wall.

12. The exhaust gas system of claim 1 , wherein at least one partition is positioned in the housing and is parallel to the first and second end walls, and wherein the at least one partition includes an opening through which the inlet tube extends.

13. The exhaust gas system of claim 12 , wherein the suction openings are configured for mixing the ambient air with different portions of the exhaust gas that are separated by the at least one partition.