Engine with exhaust treatment device and attachment method for exhaust treatment device

An engine comprising:

• a flywheel (1) on a rear side of the engine, wherein an installing direction of a crankshaft defines a front and rear direction and a width direction of the engine defines a lateral direction;
• a sideways exhaust treatment device (2) arranged on a rear upper side of the engine, having a one-side portion (4) and an other-side portion (50) and being positioned in the front and rear direction;
• an engine exhaust outlet flange (3) arranged on one side of the engine, an exhaust inlet flange (5) arranged in the one-side portion (4), and the exhaust inlet flange (5) being attached to the engine exhaust outlet flange (3) by exhaust flange fastening tools (6);
• a one-side support stay mount surface (8) and an other-side support stay mount surface (9) provided in an engine rear upper portion (7);
• a one-side support stay (10) mounted on the one-side support stay mount surface (8) and attached by a one-side support stay fastening tool (11);
• an other-side support stay (12) positioned in the front and rear direction, having a front portion (12a) thereof mounted on the other-side support stay mount surface (9) and attached by an other-side support stay fastening tool (13), such that the exhaust treatment device (2) is supported on the engine rear upper portion (7) via the one-side support stay (10) and the other-side support stay (12);
• a cutout groove (20) in an end of the front portion (12a) of the other-side support stay (12), having an edge portion (21) and an opening (23), the other-side support stay fastening tool (13) being inserted into the cutout groove (20);
• one-side support portions (14) provided in the one-side support stay (10);
• other-side support portions (15) and an other-side support stay positioning piece (36) provided in the other-side support stay (12), the other-side support portions (15) having mating surfaces (24);
• one-side supported portions (16) and other-side supported portions (17) provided in the exhaust treatment device (2), the other-side supported portions (17) having mating surfaces (25);
• one-side temporary mount portions (22) located in the one-side support stay (10);
• a gasket (3a);
• and
• an engine rear surface (32) and an other-side stay pressure receiving surface (34) provided in the engine rear surface (32);
• wherein:
• the one-side supported portions (16) of the exhaust treatment device (2) are attached to the one-side support portions (14) of the one-side support stay (10) via one-side supported portion fastening tools (18), and the other-side supported portions (17) of the exhaust treatment device (2) are attached to the other-side support portions (15) of the other-side support stay (12) via other-side supported portion fastening tools (19);
• rotational moment of the other-side support stay (12) generated by a load of the other-side portion (50) of the exhaust treatment device (2) is received by the other-side support stay fastening tool (13) via the edge portion (21) of the cutout groove (20) if the other-side support stay fastening tool (13) is brought into the cutout groove (20) from the opening (23) while guiding the front portion (12a) of the other-side support stay (12) by the other-side support stay mount surface (9), such that the load of the other-side portion (50) of the exhaust treatment device (2) is supported by the other-side support stay (12);
• the one-side portion (4) of the exhaust treatment device (2) and the one-side support stay (10) are temporarily mountable on the one-side temporary mount portions (22);
• a lateral position of the other-side support stay (12) is adjustable via sideways advancement of the other-side support stay fastening tool (13) into the cutout groove (20) from the opening (23), upon mounting the front portion (12a) of the other-side support stay (12) onto the other-side support stay mount surface (9),
• the engine exhaust outlet flange (3) is attached to the exhaust inlet flange (5) via the exhaust flange fastening tools (6) with the gasket (3a) nipped therebetween, such that the engine exhaust outlet flange (3) faces the rear side and the exhaust inlet flange (5) faces the front side,
• the mating surfaces (24) (25) are oriented facing each other, such that the other-side support stay positioning piece (36) abuts the other-side stay pressure receiving surface (34) from the rear side, and
• the mating surfaces (24) of the other-side support portions (15) of the other-side support stay (12) are adapted to be overlapped with the mating surfaces (25) of the other-side supported portions (17) of the exhaust treatment device (2) from the side, for adjusting the lateral position of the other-side support stay (12), and the other-side supported portion fastening tools (19) are fastened while axes thereof are placed sideways.