Engine device
An engine is disposed below an operator's seat in such a manner that a flywheel housing is located at the front of a traveling machine body. An exhaust gas purification device is disposed behind the engine and below a radiator. The engine is connected, on the left side thereof, to an air cleaner for taking in fresh air, and is connected, on the right side thereof, to an exhaust pipe which is connected to the air inlet side of the exhaust gas purification device.
1. An engine device mounted in a work machine in which an operator's seat is disposed on a bonnet disposed in a rear part of a traveling machine, the work machine having a machine body frame that supports an engine disposed in the bonnet of the work machine, the engine device comprising:
the engine, including an exhaust manifold, a cooling fan, and an output shaft;
an exhaust gas purification device for purifying exhaust gas of the engine;
a heat exchanger positioned to face the cooling fan and being disposed in a rear part of the engine in a rear part inside the bonnet; and
a support frame that couples the exhaust gas purification device and heat exchanger to the machine body frame;
wherein the exhaust gas purification device is positioned so that an exhaust gas flow direction thereof crosses a longitudinal direction of the output shaft of the engine, and the exhaust gas purification device is positioned under the heat exchanger;
wherein the exhaust manifold of the engine is connected to an exhaust gas inlet side of the exhaust gas purification device via an exhaust pipe; and
wherein each one of the exhaust gas purification device and the heat exchanger is directly connected to the support frame, which support frame in turn is connected to the machine body frame, the exhaust gas purification device being suspended from the support frame.
2. The engine device according to claim 1 , further comprising a counterweight disposed behind the bonnet of the traveling machine body and the exhaust gas purification device for purifying exhaust gas of the engine, wherein
the exhaust gas purification device is disposed under and between the counterweight and the engine,
said heat exchanger is one of a plurality of heat exchangers disposed to face a cooling fan disposed in a rear part of the engine in a rear part inside the bonnet, and
the heat exchangers are aligned in an ascending order of heat release amount toward a discharge direction of cooling air by the cooling fan, while the exhaust gas purification device is positioned under the heat exchangers.
3. The engine device according to claim 1 , wherein the exhaust manifold of the engine is connected to the exhaust gas inlet side of the exhaust gas purification device via the exhaust pipe, and the exhaust pipe is partially formed of a flexible tube.
4. The engine device according to claim 1 , wherein the exhaust gas purification device is connected to an engine leg attaching part in a rear part of the engine.
5. The engine device according to claim 1 , further comprising: an exhaust gas temperature increasing mechanism for increasing temperature of the exhaust gas flowing to the exhaust gas purification device disposed in a middle part of the exhaust pipe.
6. The engine device according to claim 1 , wherein an air cleaner for cleaning air taken into the engine and the exhaust pipe are disposed respectively on the left and right sides of the heat exchanger in the bonnet.
7. The engine device according to claim 1 , wherein the support frame comprises a lower support bracket connected to a lower side of the heat exchanger, and wherein the exhaust gas purification device comprises a leg fastened to the support frame.