Engine device

1. An engine device comprising:

an engine having an exhaust manifold through which exhaust gas from the engine is output;

an exhaust gas purifying device that receives the exhaust gas output from the exhaust manifold and that purifies the received exhaust gas, the exhaust gas purifying device having an elongated shape extending longitudinally relative to a longitudinal direction of an output shaft of the engine, and being disposed on a cylinder head of the engine at a position close to the exhaust manifold; and

an exhaust gas inlet half-tube having a half-cylindrical shape in which a wall of the half-tube forms the half-cylindrical shape in a lengthwise direction of the half-tube, the half-tube being open in a transverse direction to an outer surface of the exhaust purifying device, the exhaust gas inlet half-tube being attached to and extending in said longitudinal direction of the exhaust gas purifying device to form an exhaust gas introducing passage between said exhaust manifold and said exhaust gas purifying device, the exhaust gas introducing passage being circumferentially delimited by said wall of the half-tube along part of a circumference of the passage and by an outer surface of an adjacent portion of the exhaust gas purifying device along a remaining, part of said circumference of the passage; and

wherein the cylinder head includes a plurality of filter support bodies which supports the exhaust gas purifying device, the exhaust gas purifying device being connected to the exhaust manifold, and one end of the exhaust gas purifying device and an oilier end in the longitudinal direction being detachably connected to the cylinder head through the plurality of filter support bodies;

wherein an exhaust gas inflow opening and an exhaust gas outflow opening are respectively disposed on said one end of the exhaust gas purifying device and said other end, and said exhaust gas inlet half-tube covers the exhaust gas inflow opening;

wherein the exhaust gas inlet half-tube has a first end at said exhaust gas inflow opening at said one end of the exhaust gas purifying device and has a second end at which is received exhaust gas from the exhaust manifold, and wherein a first opening at said second end of the exhaust gas inlet half-tube is provided at a longitudinal center region of the exhaust gas purifying device and communicates with and is connected to the exhaust manifold, and wherein said exhaust gas introducing passage extends from said second end to said first end; and

wherein all exhaust gas flow into the exhaust gas purifying device exits the exhaust manifold from a single exit opening in the exhaust gas manifold and enters the exhaust gas inlet half-tube via a single inlet opening in the exhaust gas inlet half-tube, the single exit opening abutting the single inlet opening.

2. An engine device comprising:

an engine having an exhaust manifold through which exhaust gas from the engine is output;

an exhaust gas purifying device that receives the exhaust as output from the exhaust as manifold and that purifies the received exhaust gas, the exhaust gas purifying device having an elongated shape extending longitudinally relative to a longitudinal direction of an output shaft of the engine, and being disposed on a cylinder head of the engine at a position close to the exhaust manifold;

wherein the cylinder head includes a plurality of filter support bodies which supports the exhaust gas purifying device, the exhaust gas purifying device being connected to the exhaust manifold, and one end region of the exhaust gas purifying device and another end region in the longitudinal direction being detachably connected to the cylinder head through the plurality of filter support bodies;

wherein the exhaust gas purifying device has an exhaust gas inflow opening at said one end region and an exhaust gas outflow opening at said another region;

wherein an exhaust gas inlet passage is formed along an exterior surface of the exhaust gas purifying device as a space between said external surface and a member attached to the exhaust gas purifying device;

wherein said member has a half-cylindrical shape in which a wall of the member forms the half-cylindrical shape in a lengthwise direction of the member, the member being open in a transverse direction to an outer surface of the exhaust purifying device, the member being attached to and extending in said longitudinal direction of the exhaust as purifying device to form an exhaust gas introducing passage between said exhaust manifold and said exhaust gas purifying device, the exhaust gas introducing passage being circumferentially delimited by said wall of the half-tube along part of a circumference of the passage and by an outer surface of an adjacent portion of the exhaust gas purifying device along a remaining part of said circumference of the passage;

wherein said exhaust gas inlet passage is configured so that the exhaust gas flows from the exhaust manifold into said member opening, along the exterior surface of the exhaust gas purifying device which defines an internal wall of said exhaust gas inlet passage, and into said exhaust gas inflow opening of said exhaust gas purifying device; and

wherein all exhaust gas flow into the exhaust gas purifying device exits the exhaust manifold from a single exit opening in the exhaust gas manifold and enters the exhaust gas inlet half-tube via a single inlet opening in the member, the single exit opening abutting the single inlet opening.

3. An engine device comprising:

an engine having an exhaust manifold through which exhaust gas from the engine is output;

an exhaust gas purifying device that receives the exhaust gas output from the exhaust gas manifold and that purifies the received exhaust gas, the exhaust gas purifying device comprising a catalyst, an inner case within which is housed the catalyst, and an outer case, the exhaust gas purifying device having an elongated shape extending longitudinally relative to a longitudinal direction of an output shaft of the engine, and being disposed on a cylinder head of the engine at a position close to the exhaust manifold; and

an exhaust gas inlet half-tube having a half-cylindrical shape in which a wall of the half-tube forms the half-cylindrical shape in a lengthwise direction of the half-tube, the half-tube being open in a transverse direction to an outer surface of the exhaust purifying device, the exhaust gas inlet half-tube being attached to and extending in said longitudinal direction of the exhaust gas purifying device to form an exhaust gas introducing passage between said exhaust manifold and said exhaust gas purifying device, the exhaust gas introducing passage being circumferentially delimited by said wall of the half-tube along part of a circumference of the passage and by an outer surface of an adjacent portion of the exhaust gas purifying device along a remaining part of said circumference of the passage; and

wherein the cylinder head includes a plurality of filter support bodies which supports the exhaust gas purifying device, the exhaust gas purifying device being connected to the exhaust manifold, and one end of the exhaust gas purifying device and an other end in the longitudinal direction being detachably connected to the cylinder head through the plurality of filter support bodies;

wherein an exhaust gas inflow opening and an exhaust gas outflow opening are respectively disposed on said one end of the exhaust gas purifying device and said other end, and said exhaust gas inlet half-tube covers the exhaust gas inflow opening;

wherein the exhaust gas inlet half-tube has a first end at said exhaust gas inflow opening at said one end of the exhaust gas purifying device and has a second end at which is received exhaust gas from the exhaust manifold, and wherein a first opening at said second end of the exhaust gas inlet half-tube is provided at a longitudinal center region of the exhaust gas purifying device and communicates with and is connected to the exhaust manifold, and wherein said exhaust gas introducing passage extends from said second end to said first end; and

wherein all exhaust gas flow into the exhaust gas purifying device exits the exhaust manifold from a single exit opening in the exhaust gas manifold and enters the exhaust gas inlet half-tube via a single inlet opening in the exhaust gas inlet half-tube, the single exit opening abutting the single inlet opening.