Engine device

1. An engine device comprising:

an exhaust gas purification device including:

a first case configured to communicate with an exhaust manifold of an engine and internally including a first exhaust gas purification body configured to remove a carbon compound; and

a second case configured to communicate with an exhaust outlet of the first case and internally including a second exhaust gas purification body configured to remove a nitrogen compound; and

wherein:

the first and second cases are arranged above the engine and in an L-shape to respectively extend along two side surfaces of the engine, the two side surfaces being adjacent to each other and comprising a first side surface and a second side surface,

the second case is disposed below the first case, and

the first case and the second case are connected to each other via a urea mixing tube that is positioned in a vertically overlapping region defined by the first case and the second case and between the first case and the second case.

2. The engine device according to claim 1 , wherein a turbocharger is interposed between the first case and the exhaust manifold, and the first case and the turbocharger are connected to each other in series above the exhaust manifold disposed close to the first side surface.

3. The engine device according to claim 2 , wherein a flywheel housing is disposed close to the second side surface intersecting the first side surface, and the second case is disposed above the flywheel housing.

4. The engine device according to claim 1 , wherein a urea-water injection body for injecting urea water into the first case is fixed to a portion of an outer peripheral surface of the first case, the portion being in the vertically overlapping region, and the portion being not a portion of the first case through which the urea mixing tube is inserted into the first case.

5. The engine device according to claim 1 , wherein a part of the second exhaust gas purification body is a selective catalytic reduction filter made of a particulate-matter collection filter to which a catalytic component for urea selective catalytic reduction is applied.

6. The engine device according to claim 1 , wherein:

the urea mixing tube is in fluid communication with the first case at a first opening of the first case and in fluid communication with the second case at a second opening of the second case, and

the first opening is positioned such that at least a portion of the first opening is vertically aligned with a portion of the second case.

7. An engine device comprising:

an exhaust gas purification device including:

a first case configured to communicate with an exhaust manifold of an engine and internally including a first exhaust gas purification body configured to remove a carbon compound; and

a second case configured to communicate with an exhaust outlet of the first case and internally including a second exhaust gas purification body configured to remove a nitrogen compound,

wherein:

the first and second cases are arranged above the engine and in an L-shape to respectively extend along two side surfaces of the engine, the two side surfaces being adjacent to each other,

a urea-water injection body for injecting urea water into a urea mixing tube is disposed in a portion of the first case that is close to the exhaust outlet of the first case, and the urea mixing tube has both ends respectively inserted into the exhaust outlet of the first case and an exhaust inlet of the second case to allow the first case and the second case to communicate with each other, and

the second case is disposed below the first case, and the first case and the second case are connected to each other via the urea mixing tube in a position in which the first case and the second case overlap each other in a plan view.

8. The engine device according to claim 7 , wherein the urea mixing tube has a first inserted portion that is inserted into the first case, the first inserted portion extending toward the urea-water injection body, the first inserted portion having a tube wall on which an exhaust introduction opening is bored, and the exhaust introduction opening allowing an exhaust gas having passed through the first exhaust gas purification body to be introduced into the urea mixing tube.

9. The engine device according to claim 7 , wherein the urea mixing tube has a second inserted portion that is inserted into the second case, the second inserted portion having a distal end that is tapered, and the second inserted portion extending to a position apart from an inner wall surface of the second case.

10. The engine device according to claim 8 , wherein a mixer for stirring and mixing urea water with an exhaust gas is internally included in a second inserted portion of the urea mixing tube, the second inserted portion being inserted into the second case.

11. The engine device according to claim 8 , wherein a mixer for stirring and mixing urea water with an exhaust gas is disposed in the first inserted portion of the urea mixing tube, the first inserted portion being inserted into the first case.

12. The engine device of claim 7 , wherein:

the urea mixing tube is positioned in a vertically overlapping region between the first case and the second case.

13. The engine device according to claim 12 , wherein:

the urea mixing tube is in fluid communication with the first case at a first opening of the first case and in fluid communication with second case at a second opening of the second case.

14. A system comprising:

an exhaust gas purification system comprising:

a first case configured to receive exhaust gas and arranged on a first side of an engine;

a second case positioned below the first case and arranged on a second side of the engine that is adjacent to the first side; and

a urea mixing tube configured to communicatively connect an outlet of the first case and an inlet of the second case; and

wherein the urea mixing tube is positioned in a vertically overlapping region defined by at least a portion of the first case and at least a portion of the second case and between the first case and the second case.

15. The system of claim 14 , wherein:

the exhaust gas purification system includes:

a first exhaust gas purification body positioned within a chamber of the first case and configured to remove carbon, and/or

a second exhaust gas purification body positioned within a chamber of the second case configured to remove nitrogen.

16. The system of claim 14 , further comprising:

the engine, where the first case is configured to receive the exhaust gas from an exhaust manifold of the engine.

17. The system of claim 14 , wherein:

the urea mixing tube is in fluid communication with the first case at a first opening of the first case and in fluid communication with the second case at a second opening of the second case.

18. The system of claim 17 , wherein:

the first opening is positioned such that at least a portion of the first opening is vertically aligned with a portion of the second case.

19. The system of claim 14 , wherein:

the exhaust gas purification system includes a urea-water injection body configured to inject urea water into the urea mixing tube.

20. The system of claim 19 , wherein:

the urea mixing tube is in fluid communication with the first case at a first opening of the first case and in fluid communication with the second case at a second opening of the second case, and

the urea-water injection body is arranged in the first case.