An engine having an exhaust gas treatment apparatus attached thereto, wherein an exhaust gas treatment apparatus (4) is supported by an engine body (1) and the engine body (1) and the exhaust gas treatment apparatus (4) communicate with each other through an exhaust pipe (13),
a casing of the exhaust gas treatment apparatus (4) is configured to comprise a plurality of casing units (5, 6, 7) separable from each other;
connection flanges (8, 9, 10, 11) are disposed in respective end portions of the casing units (5, 6, 7);
the casing units (5, 6, 7) are coupled together by a connection of the connection flanges (8, 9, 10, 11); characterized in that:
the exhaust gas treatment apparatus (4) is supported by the engine body (1) through the connection flanges (8, 9, 10, 11);
a diesel particulate filter (17) is accommodated in the exhaust gas treatment apparatus (4),
the casing of the exhaust gas treatment apparatus (4) comprises an accommodation casing unit (5) for the diesel particulate filter (17), the exhaust inlet-side casing unit (6) and the exhaust outlet-side casing unit (7);
the exhaust inlet-side casing unit (6) and the exhaust

outlet-side casing unit (7) are detachably coupled to both ends of the accommodation casing unit (5) for the diesel particulate filter (17);
a ring-shaped spacer (39) is inserted between the connection flanges (8, 10) of the accommodation casing unit (5) for the diesel particulate filter (17) and the exhaust inlet-side casing unit (6),
a DPF inlet-side space (40) is formed within the ring-shaped spacer (39),
a sensor installation hole (41) is formed in the ring-shaped spacer (39), and
an exhaust sensor (42) can be inserted from the sensor installation hole (41) toward the DPF inlet-side space (40). [Claim 2]
The engine as claimed in claim 1, wherein:
a plurality of locked units (8a, 10a) is arranged in the connection flanges (8, 10) where the accommodation casing unit (5) for the diesel particulate filter (17) and the exhaust inlet-side casing unit (6) overlap with each other and spaced apart from each other at equal angles in their circumferential direction,
a plurality of locked units (39a) is spaced apart from each other at equal angles and arranged in the ring-shaped spacer (39) in the circumferential direction, and
a posture of the ring-shaped spacer (39) is moved in

the circumferential direction in the unit of the spaced
angle, the locked units (39a) of the ring-shaped spacer
(39) are matched with the locked units (8a, 10a) of the
connection flanges (8, 10), and the locked units (8a, 10a)
of the connection flanges (8, 10) and the locked units
(39a) of the ring-shaped spacer (39) are fastened using the
flange connection fastening members (43), so that the
posture of the ring-shaped spacer (39) can be changed in
the circumferential direction and thus a position and
posture of the sensor installation hole (41) can be changed.
[Claim 3]
The engine as claimed in claim 1 or 2, wherein:
the connection flanges (8, 9) of the accommodation casing unit (5) for the diesel particulate filter (17) overlap with the connection flanges (10, 11) of the exhaust inlet-side casing unit (6) and the exhaust outlet-side casing unit (7),
support protrusions (32, 33) are formed in the connection flanges (10, 11) of the exhaust inlet-side casing unit (6) and the exhaust outlet-side casing unit (7) and externally more protruded than the connection flanges (8, 9) of the accommodation casing unit (5) for the diesel particulate filter (17) in a diameter direction,
the exhaust gas treatment apparatus (4) is supported by the engine body (1) through the support protrusions (32,

33), and
in the state in which the exhaust inlet-side casing unit (6) and the exhaust outlet-side casing unit (7) are supported by the engine body (1), the accommodation casing unit (5) for the diesel particulate filter (17) can be pulled out between the exhaust inlet-side casing unit (6) and the exhaust outlet-side casing unit (7). [Claim 4]
The engine as claimed in any one of claims 1 to 3, wherein:
a flange-fit concave unit (38b) having an upper portion opened is installed in the support bracket (12b), and
a lower edge portion of at least one of the connection flanges (9, 11) where the accommodation casing unit (5) for the diesel particulate filter (17) and the exhaust outlet-side casing unit (7) overlap with each other is fitted into the flange-fit concave unit (38b). [Claim 5]
The engine as claimed in any one of claims 1 to 4, wherein:
a pipe installation boss (46) having an exhaust pressure entrance pipe (45) of an exhaust pressure sensor (44) installed therein is disposed in a peripheral wall of the exhaust outlet-side casing unit (7), and

a boss hole (47) of the pipe installation boss (46) is upwardly formed externally. [Claim 6]
The engine as claimed in any one of claims 1 to 5, wherein:
an exhaust inlet pipe (48) is installed in the exhaust inlet-side casing unit (6),
the plurality of locked units (8a, 10a) is spaced apart from each other at equal angles and arranged in the connection flanges (8, 10) where the accommodation casing unit (5) for the diesel particulate filter (17) and the exhaust inlet-side casing unit (6) overlap with each other in their circumferential direction, and
the exhaust inlet-side casing unit (6) is moved in the circumferential direction in the unit of the spaced angle, and the locked unit (10a) of the connection flange (10) of the exhaust inlet-side casing unit (6) is matched with the locked unit (8a) of the connection flange (8) of the accommodation casing unit (5) for the diesel particulate filter (17) and then fastened using the flange connection fastening member (43), so that a posture of the exhaust inlet-side casing unit (6) can be changed in the circumferential direction and thus a direction of an inlet (48a) of the exhaust inlet pipe (48) can be changed. [Claim 7]

The engine as claimed in any one of claims 1 to 6, wherein:
an exhaust outlet pipe (49) is installed in the exhaust outlet-side casing unit (7),
a plurality of locked units (11a, 9a) is spaced apart from each other at equal angles and arranged in their circumferential direction in the connection flanges (11, 9) where the exhaust outlet-side casing unit (7) and the accommodation casing unit (5) for the diesel particulate filter (17) overlap with each other,
the exhaust outlet-side casing unit (7) is moved in
the unit of the spaced angle in the circumferential
direction, and the locked unit (11a) of the connection
flange (11) of the exhaust outlet-side casing unit (7) is
matched with the locked unit (9a) of the connection flange
(9) of the accommodation casing unit (5) for the diesel
particulate filter (17) and then fastened using flange
connection fastening members (50), so that a posture of the
exhaust outlet-side casing unit (7) can be changed in the
circumferential direction and thus a direction of an outlet
(49a) of the exhaust outlet pipe (49) can be changed.
[Claim 8]
The engine as claimed in any one of claims 1 to 7, wherein the exhaust gas treatment apparatus (4) is supported by the engine body (1) through the plurality of

connection flanges (8, 9, 10, 11) spaced apart from each other. [Claim 9]
The engine as claimed in any one of claims 1 to 8, wherein:
support stays (2, 3) are installed in the engine body
(1),
a support bracket (12) is attached to the connection flanges (8, 9, 10, 11) and placed on the support stays (2, 3),
a weight of the exhaust gas treatment apparatus (4) is supported by the support stays (2, 3) through the support bracket (12), and
the support bracket (12) is installed in the support stays (2, 3) using bracket installation fastening members (14). [Claim 10]
The engine as claimed in claim 9, wherein in the state in which a direction along which a crank shaft center line (16) extends is forward and backward directions and a width direction of the engine body (1) orthogonal to the crank shaft center line (16) is left and right directions,
the support stays (2, 3) include the support stays (2, 3) on front and back sides, the support stays (2, 3) on the front and back sides are respectively installed on front

and back sides of the engine body (1), the support bracket (12) is lengthily formed forward and backward, the support bracket (12) is installed between the support stays (2, 3) on the front and back sides, and the exhaust gas treatment apparatus (4) is supported by the engine body (1) through the support stays (2, 3) on the front and back sides in the state in which the exhaust gas treatment apparatus (4) has a long posture in the left and right directions. [Claim 11]
The engine as claimed in claim 10, wherein:
the support bracket (12) comprises support brackets (12a, 12b) on the left and right sides,
the support brackets (12a, 12b) on the left and right sides are respectively attached to the connection flanges (8, 10 and 9, 11) on the left and right sides, and
front and rear end portions of the support brackets (12a, 12b) on the left and right sides are placed above the support stays (2, 3) on the front and back sides and installed using bracket installation fastening members (14a, 14b) on the left and right sides. [Claim 12]
The engine as claimed in any one of claims 9 to 11, wherein:
support brackets (12a, 12b) are attached to the connection flanges (10, 11) using bracket installation

fastening members (25),
position adjustment holes (26) of the bracket installation fastening members (25) are formed in at least one of the connection flanges (10, 11) and the support brackets (12a, 12b), and
positions of at least upper and lower directions of the bracket installation fastening members (25) can be adjusted using the position adjustment holes (26). [Claim 13]
The engine as claimed in claim 12, wherein:
the position adjustment holes (26) of the bracket installation fastening members (25) comprise large-diameter holes (27),
the large-diameter holes (27) are formed in one of the connection flanges (10, 11) and the support bracket (12) and small-diameter holes (28) are formed in the other of the connection flanges (10, 11) and the support bracket (12),
an inside diameter of each of the large-diameter holes (27) is set to a size in which a portion through which the bracket installation fastening member (25) inserted into the large-diameter hole (27) passes can be moved and adjusted in a direction orthogonal to a direction along which the portion passes,
an inside diameter of each of the small-diameter holes

(28) is set to a size in which a portion through which the
bracket installation fastening member (25) inserted into
the small-diameter hole (28) passes cannot be moved and
adjusted in a direction orthogonal to a direction along
which the portion passes, and
in the state in which a direction along which a crank shaft center line (16) extends is forward and backward directions and a width direction of the engine body (1) orthogonal to the crank shaft center line (16) is left and right directions, the large-diameter hole (27) and the small-diameter hole (28) overlap with each other left and right and the bracket installation fastening members (25) are inserted into the overlapping position and configured to pass therethrough. [Claim 14]
The engine as claimed in any one of claims 9 to 13, wherein in the state in which a direction along which a crank shaft center line (16) extends is forward and backward directions and a width direction of the engine body (1) orthogonal to the crank shaft center line (16) is left and right directions,
the support brackets (12a, 12b) are installed in the support stays (2, 3) using respective bracket installation fastening members (14a, 14b), position adjustment holes
(29) of the bracket installation fastening members (14a,

14b) are installed in at least one of the support brackets (12a, 12b) and the support stays (2, 3), and positions of at least forward and backward directions and left and right directions of the bracket installation fastening members (14a, 14b) can be adjusted using the position adjustment holes (29). [Claim 15]
The engine as claimed in claim 14, wherein:
the position adjustment holes (29) of the bracket installation fastening members (14a, 14b) comprise a long hole (30) in the forward and backward directions and a long hole (31) in the left and right directions,
the long hole (30) of the forward and backward directions is formed in one of the support stays (2, 3) and the support brackets (12a, 12b),
the long hole (31) of the left and right directions is formed in the other of the support stays (2, 3) and the support brackets (12a, 12b),
the long hole (30) of the forward and backward directions and the long hole (31) of the left and right directions overlap with each other up and down in a crossing form, and
the bracket installation fastening members (14a, 14b) are inserted into the overlapping position and configured to pass therethrough.

[Claim 16]
The engine as claimed in any one of claims 1 to 15,
wherein in accommodating the diesel particulate filter (17)
in the exhaust gas treatment apparatus (4), in the state in
which a direction along which a crank shaft center line
(16) extends is forward and backward directions,
an engine cooling fan (18) is disposed in a front part of the engine body (1), and the exhaust gas treatment apparatus (4) is disposed at a position higher than an upper end portion (21) of the engine cooling fan (18) on an upper side of a head cover (20) attached to an upper portion of a cylinder head (19). [Claim 17]
The engine as claimed in any one of claims 1 to 16, wherein an exhaust inlet flange (23) of the exhaust gas treatment apparatus (4) is placed above an engine exhaust outlet flange (22) of the engine body (1). [Claim 18]
The engine as claimed in any one of claims 1 to 3, wherein:
the diesel particulate filter (17) is accommodated in the exhaust gas treatment apparatus (4),
the casing of the exhaust gas treatment apparatus (4) comprises the accommodation casing unit (5) for the diesel particulate filter (17), the exhaust inlet-side casing unit

(6), and the exhaust outlet-side casing unit (7), and
in the state in which a direction along which a crank shaft center line (16) extends is forward and backward directions and a width direction of the engine body (1) orthogonal to the crank shaft center line (16) is left and right directions, an engine cooling fan (21) is disposed in a front part of the engine body (1), the exhaust gas treatment apparatus (4) has a long posture in the left and right directions, and the accommodation casing unit (5) for the diesel particulate filter (17) is disposed on an upper back side of a flywheel housing (51) immediately after a head cover (20) attached to an upper portion of the cylinder head (19).