Engine device

1. An engine device comprising:

an engine comprising a crankshaft, an exhaust manifold, a cylinder block, a cylinder head, a head cover, a flywheel housing, and a cooling water pump;

an exhaust-gas purification device comprising an exhaust-gas inlet and disposed at an upper face side of the engine such that a direction of a long side of the exhaust-gas purification device is perpendicular to a longitudinal direction of the crankshaft, the exhaust-gas purification device being configured to purify exhaust gas discharged from the engine; and

an exhaust throttle device disposed between the exhaust manifold, included in the engine, and the exhaust-gas inlet, included in the exhaust-gas purification device, wherein the exhaust throttle device comprises a throttle valve case, an exhaust throttle valve, an actuator case, an actuator, a cooling water case, a cooling water outlet tube, and a cooling water inlet tube, and wherein

the cylinder head is mounted on the cylinder block, the exhaust manifold is disposed on a top face of the cylinder head, the flywheel housing is disposed at a side of the cylinder block, the cooling water pump is disposed closer to a side of the engine which is opposite to a side of the engine where the flywheel housing is located than the side of the engine where the flywheel housing is located, the exhaust-gas purification device treats exhaust gas from the exhaust manifold, the exhaust-gas purification device is disposed above the flywheel housing, the crankshaft is housed within the cylinder block, the exhaust throttle device is disposed laterally with respect to the head cover, a space is provided between the head cover and the exhaust throttle device, the throttle valve case houses the exhaust throttle valve, the actuator case houses the actuator, the actuator is configured to control an opening motion of the exhaust throttle valve, the cooling water case coupes the actuator case to the throttle valve case, and the cooling water outlet tube and the cooling water inlet tube protrude on a side of the cooling water pump and are disposed between the actuator case and the head cover.

2. The engine device according to claim 1 , further comprising an engine controller comprising an output port coupled to the exhaust throttle device and configured to control an opening of the exhaust throttle device when regeneration of the exhaust-gas purification device is performed.

3. The engine device according to claim 1 , further comprising a relay tube secured to an upper face side of the exhaust throttle device,

wherein the exhaust throttle device and the relay tube are disposed in a multilayer structure relative to the exhaust manifold, and the exhaust-gas inlet of the exhaust-gas purification device is coupled to the relay tube, and the relay tube is located at a highest layer of the multilayer structure, and wherein

a coupling support portion of the relay tube is positioned between the exhaust throttle device and the exhaust-gas inlet of the exhaust-gas purification device and wherein the coupling support portion is coupled to a side face of the exhaust manifold.

4. The engine device according to claim 3 , wherein the coupling support portion comprises a wing-shaped plate protruding from an outer circumference of the relay tube toward the exhaust manifold, and wherein the wing-shaped plate is fastened on the side face of the exhaust manifold.