engine

Abstract

To provide an engine that enables an exhaust emission control device to be easily supported on an upper side of an engine body.SOLUTION: An engine includes an engine body and a support table for supporting an exhaust emission control device. The support table includes: a bent part provided below an outer peripheral surface of the exhaust emission control device; and a bracket mounting part disposed below the bent part. The bracket mounting part is fixed to a bracket vertically mounted to the engine body.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an engine equipped with an exhaust gas purification device, and more particularly to a configuration for mounting the exhaust gas purification device to the engine. [Background technology]

[0002] 2. Description of the Related Art Conventionally, configurations for purifying engine exhaust gas using an exhaust purification device are known. Patent Document 1 discloses a construction machine having this type of configuration.

[0003] The construction machine of Patent Document 1 has an engine and an exhaust purification device provided separately from the engine, which are disposed in an engine compartment, and the exhaust purification device is supported above the hydraulic pump by a support member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2012 / 056643 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the configuration of Patent Document 1, the exhaust purification device is provided separately from the engine, so space is required for the engine and the exhaust purification device. From the perspective of saving space, a structure has been proposed in which the exhaust purification device is disposed above the engine and supported by the engine, but because the structure of the engine body is complex, there has been a demand for an attachment structure that allows the exhaust purification device to be easily attached to the engine body.

[0006] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide an engine in which an exhaust purification device can be easily supported above the engine body. [Means for solving the problem]

[0007] An engine according to one aspect of the present invention is an engine having an exhaust gas purification device that purifies exhaust gas, and comprises an engine body and a support base that supports the exhaust gas purification device, the support base having a curved portion provided below the outer peripheral surface of the exhaust gas purification device and a bracket mounting portion below the curved portion, and the bracket mounting portion is fixed to a bracket that is attached in the vertical direction to the engine body. Effect of the Invention

[0008] According to the present invention, the exhaust purification device can be easily supported above the engine body. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a configuration of an engine according to an embodiment of the present invention; [Diagram 2] 1 is a conceptual diagram showing the flow of intake and exhaust air in an engine. [Diagram 3] FIG. 2 is an exploded perspective view showing how the ATD and the support base are attached to the engine body. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 13 is an exploded perspective view showing a state in which the first auxiliary member is attached to the support base. [Figure 7] FIG. 13 is an exploded perspective view showing a state in which the second auxiliary member is attached to the support base. [Figure 8] FIG. 1 is a perspective view showing how the ATD is attached to the support base. [Figure 9] FIG. 4 is an exploded perspective view showing a state in which the front support bracket and the intake side support bracket are attached to the engine body. [Figure 10] FIG. 4 is an exploded perspective view showing a state in which the rear support bracket and the exhaust side support bracket are attached to the engine body. [Figure 11] FIG. [Figure 12]FIG. 13 is a perspective view showing the configuration of a support base according to a modified example. [Figure 13] FIG. 13 is a perspective view showing the ATD attached to a modified support base. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing a configuration of an engine 100 according to an embodiment of the present invention. Fig. 2 is a conceptual diagram showing the flow of intake air and exhaust gas in the engine 100.

[0011] 1 is a diesel engine that is mounted on, for example, agricultural machinery such as tractors and construction machinery such as skid steer loaders. The engine 100 is configured as, for example, an in-line four-cylinder engine having four cylinders. Note that the number of cylinders is not limited to four.

[0012] First, a basic configuration of the engine body 1 of the engine 100 will be described. In the following description, the up-down direction of the engine 100 shown in FIG. 1 will be referred to as the height direction. The engine 100 has a generally elongated rectangular shape in a plan view, and its longitudinal direction coincides with the direction in which the crankshaft 10 extends. In the following description, the longitudinal direction of the engine 100 refers to the direction of the rotation axis of the crankshaft 10. In addition, a direction perpendicular to both the height direction and the longitudinal direction will be referred to as the width direction of the engine 100. The height direction of the engine 100 corresponds to the first direction, the longitudinal direction corresponds to the second direction, and the width direction corresponds to the third direction.

[0013] As shown in FIG. 1 etc., the engine body 1 is mainly composed of an oil pan 11, a cylinder block 12, a cylinder head 13, and a head cover 14, which are arranged in this order from the bottom.

[0014] The oil pan 11 is provided under (at the lower end of) the engine 100. The oil pan 11 is formed in the shape of a container with an open top. Engine oil for lubricating the engine 100 is stored inside the oil pan 11.

[0015] The cylinder block 12 is attached to the upper side of the oil pan 11. A recess is formed in the lower part of the cylinder block 12 for accommodating the crankshaft 10 and the like. Although omitted in Fig. 1, a plurality of cylinders 30 are formed in the upper part of the cylinder block 12 as shown in Fig. 2. The four cylinders 30 are arranged side by side along the axial direction of the crankshaft 10.

[0016] A piston is housed in each cylinder 30. The piston inside the cylinder 30 can move up and down. The piston is connected to the crankshaft 10 via a connecting rod (not shown). The crankshaft 10 rotates as the piston reciprocates in each cylinder 30.

[0017] 1 and other figures, the cylinder head 13 is attached to the upper side of the cylinder block 12. The cylinder head 13 and the cylinder block 12 form combustion chambers 31 shown in FIG.

[0018] The head cover 14 is provided on the upper side of the cylinder head 13. A valve mechanism including push rods and rocker arms (not shown) for operating intake valves and exhaust valves (not shown) is housed inside the head cover 14.

[0019] A cooling fan 6 is rotatably attached to one longitudinal side of the engine 100. The cooling fan 6 rotates when power is transmitted from the crankshaft 10. The cooling fan 6 generates an air flow as it rotates, and passes the air through a radiator (not shown) for cooling the coolant of the engine 100, while blowing the air against the engine 100. As a result, the engine 100 is cooled.

[0020] A flywheel housing 61 is disposed on the opposite side of the cooling fan 6 in the longitudinal direction of the engine 100. Although not shown, a flywheel of the engine 100 is disposed inside the flywheel housing 61. Therefore, in the following description, the term "flywheel housing 61 side" is essentially synonymous with the term "flywheel side."

[0021] Next, the configuration of the engine 100 of this embodiment will be briefly described with reference to FIG. 2 etc., focusing on the flow of intake air and exhaust gas.

[0022] As shown in FIG. 2, the engine 100 includes an intake section 2, a power generating section 3, and an exhaust section 4 as its main components.

[0023] The intake section 2 draws in air from the outside and includes an intake pipe 21, a throttle valve 22, an intake manifold 23, and a supercharger 24.

[0024] The intake pipe 21 constitutes an intake passage, and allows air drawn in from the outside to flow inside.

[0025] The throttle valve 22 is disposed in the middle of the intake passage. The throttle valve 22 changes its opening in accordance with a control command from a control device (not shown) to change the cross-sectional area of ​​the intake passage. This makes it possible to adjust the amount of air supplied to the intake manifold 23.

[0026] The intake manifold 23 is connected to the downstream end of the intake pipe 21 in the direction in which the intake air flows. The intake manifold 23 distributes the air supplied through the intake pipe 21 according to the number of cylinders 30, and supplies the air to the combustion chambers 31 formed in each cylinder 30.

[0027] The power generating unit 3 is composed of a plurality of (four in this embodiment) cylinders 30. The power generating unit 3 burns fuel in a combustion chamber 31 formed in each cylinder 30, thereby generating power for reciprocating a piston.

[0028] Specifically, in each combustion chamber 31, air supplied from the intake manifold 23 is compressed, and then fuel supplied from a fuel supply unit (not shown) is injected. This causes combustion in the combustion chamber 31, causing the piston to reciprocate up and down. The power thus obtained is transmitted to an appropriate device downstream of the power via the crankshaft 10, etc.

[0029] 2, the turbocharger 24 includes a turbine 25, a shaft 26, and a compressor 27. The compressor 27 is connected to the turbine 25 via the shaft 26. In this manner, the compressor 27 rotates in accordance with the rotation of the turbine 25, which rotates using the exhaust gas discharged from the combustion chamber 31, whereby air purified by an air cleaner (not shown) is compressed and forcibly sucked in.

[0030] The exhaust section 4 discharges exhaust gas generated in the combustion chamber 31 to the outside. The exhaust section 4 includes an exhaust pipe 41, an exhaust manifold 42, and an ATD (exhaust gas purification device) 43. ATD is an abbreviation for After Treatment Device.

[0031] The exhaust pipe 41 constitutes an exhaust gas passage, and allows the exhaust gas discharged from the combustion chamber 31 to flow therethrough. The exhaust pipe 41 includes a turbocharger introduction pipe 51, a connection pipe 52, and an exhaust pipe 53.

[0032] The exhaust manifold 42 is connected to an upstream end of the exhaust pipe 41 in the direction in which the exhaust gas flows. The exhaust manifold 42 collects the exhaust gas generated in each combustion chamber 31 and guides it to the exhaust pipe 41 (specifically, the turbocharger introduction pipe 51).

[0033] As shown in Fig. 1, the exhaust manifold 42 is attached to a lateral surface of the cylinder head 13, which is formed in a generally rectangular parallelepiped shape. In the following, the side of the engine body 1 on which the exhaust manifold 42 is attached may be referred to as the exhaust side. Meanwhile, the aforementioned intake manifold 23 is attached to one of the lateral surfaces of the cylinder head 13, opposite the exhaust manifold 42. In the following, the side of the engine body 1 on which the intake manifold 23 is attached may be referred to as the intake side. The exhaust side and the intake side face each other in the width direction of the engine 100.

[0034] The exhaust gas in the exhaust manifold 42 passes through a turbocharger introduction pipe 51 and flows into the turbocharger 24. After driving the turbine 25 of the turbocharger 24, the exhaust gas passes through a connecting pipe 52 and flows into the ATD 43.

[0035] The ATD 43 is a device that performs aftertreatment of exhaust gas. The ATD 43 is disposed in the middle of the exhaust pipe 41. The ATD 43 purifies the exhaust gas by removing harmful components such as NOx (nitrogen oxides), CO (carbon monoxide), and HC (hydrocarbons) and particulate matter contained in the exhaust gas.

[0036] The ATD 43 includes a DPF device 44 and an SCR device 45. DPF is an abbreviation for Diesel Particulate Filter. SCR is an abbreviation for Selective Catalytic Reduction.

[0037] The DPF device 44 removes carbon monoxide, nitrogen monoxide, particulate matter, etc. contained in the exhaust gas through an oxidation catalyst and a filter (not shown) housed in a DPF case 44a shown in Fig. 1 etc. The oxidation catalyst is made of platinum or the like, and is a catalyst for oxidizing (burning) unburned fuel, carbon monoxide, nitrogen monoxide, etc. contained in the exhaust gas. The filter is disposed downstream of the oxidation catalyst in the exhaust gas flow, and is configured as, for example, a fall-flow type filter. The filter collects particulate matter contained in the exhaust gas treated by the oxidation catalyst.

[0038] 1 and 3, the DPF case 44a is made of an elongated, generally cylindrical, hollow member. The DPF case 44a is attached to the upper side of the engine body 1 so that the longitudinal direction of the DPF case 44a is parallel to the longitudinal direction of the engine 100. The DPF case 44a is disposed closer to the exhaust side (the side where the turbocharger 24 and the exhaust manifold 42 are located) in the width direction of the engine 100 than an SCR case 45a described later.

[0039] Inside the DPF device 44, exhaust gas flows from the side closer to the cooling fan 6 to the side closer to the flywheel housing 61. The exhaust gas that has passed through the DPF device 44 flows into a connecting pipe 54. The connecting pipe 54 has a straight portion disposed generally parallel to the DPF device 44 and the SCR device 45. In the connecting pipe 54, the exhaust gas flows from the side closer to the flywheel housing 61 to the side closer to the cooling fan 6. In the connecting pipe 54, the exhaust gas is mixed with urea supplied from a urea supply device (not shown). The exhaust gas then flows from the connecting pipe 54 to the SCR device 45.

[0040] The SCR device 45 removes NOx contained in exhaust gas through an SCR catalyst and a slip catalyst housed in an SCR case 45a shown in FIG. 1 etc. The SCR catalyst is made of a material such as ceramic that adsorbs ammonia. When NOx contained in exhaust gas comes into contact with the SCR catalyst that has adsorbed ammonia, it is reduced and changes into nitrogen and water. The slip catalyst is used to prevent ammonia from being released to the outside. The slip catalyst is a catalyst such as platinum that oxidizes ammonia, and oxidizes the ammonia and changes it into nitrogen and water.

[0041] 1, the SCR case 45a is configured from an elongated, generally cylindrical, hollow member, similar to the DPF case 44a. The SCR case 45a is attached to the upper side of the engine body 1 so that its longitudinal direction is parallel to the longitudinal direction of the engine 100. The SCR case 45a is attached closer to the intake side in the width direction of the engine 100 than the DPF case 44a. That is, the DPF case 44a and the SCR case 45a are attached side by side in the width direction of the engine 100.

[0042] Inside the SCR device 45, the exhaust gas flows from the side closer to the cooling fan 6 to the side closer to the flywheel housing 61. The exhaust gas that has passed through the SCR device 45 is discharged to the outside via an exhaust pipe 53 connected to an exhaust gas outlet of the SCR case 45a.

[0043] Next, a support structure for supporting the ATD 43 (that is, the DPF case 44a and the SCR case 45a) above the engine body 1 will be described with reference to Fig. 3 etc. Fig. 3 is an exploded perspective view showing the configuration of the engine 100.

[0044] In the following, "front" refers to the side closer to the cooling fan 6 in the longitudinal direction of the engine 100, and "rear" refers to the side closer to the flywheel housing 61 in the longitudinal direction of the engine 100. However, these designations of directions are merely for convenience and do not limit the direction in which the engine 100 is attached to a machine, etc.

[0045] In the engine 100 of this embodiment, the support structure for supporting the ATD 43 above the engine body 1 is composed of a support base 8 and a support bracket 9, as shown in Figures 1 and 3. Specifically, as shown in Figure 3, the ATD 43 (i.e., the DPF case 44a and the SCR case 45a) is mounted on the support base 8 and attached to the engine body 1 via the support bracket 9.

[0046] 4, the support base 8 is made of a generally plate-shaped casting. In the support base 8, the portions facing the lower portion of the DPF case 44a and the lower portion of the SCR case 45a are formed in a curved shape along the outer circumferential surfaces of the DPF case 44a and the SCR case 45a. In other words, when viewed in the longitudinal direction of the engine 100, the support base 8 is made of two arc-shaped plates arranged in the width direction.

[0047] The support base 8 has an elongated shape in a plan view. As shown in Fig. 1 and Fig. 3, the support base 8 is positioned and supported above the engine body 1 (specifically, the head cover 14) so ​​that its thickness direction coincides with the height direction of the engine 100, its longitudinal direction coincides with the longitudinal direction of the engine 100, and its width direction coincides with the width direction of the engine 100.

[0048] 4, the support base 8 is configured by attaching a first support part 70 and a second support part 80 side by side in the longitudinal direction. The first support part 70 is disposed on the front side, and the second support part 80 is disposed on the rear side. However, this is not limited thereto, and the support base 8 may be formed as a single unit.

[0049] As shown in Fig. 4 etc., the first support part 70 is formed in a substantially T-shape in plan view. The first support part 70 is formed with a case front attachment part 81 and a front end bracket attachment part 83. The front ends of the DPF case 44a and the SCR case 45a are attached to the case front attachment part 81. The support bracket 9 is attached to the front end bracket attachment part 83.

[0050] The second support portion 80 is formed in a substantially rectangular shape in a plan view. A case rear attachment portion 82 is formed on the second support portion 80. The rear ends of the DPF case 44a and the SCR case 45a are attached to the case rear attachment portion 82.

[0051] Further, the second support portion 80 is formed with a rear end bracket mounting portion 84, an exhaust side bracket mounting portion 85, and an intake side bracket mounting portion 86. A support bracket 9 is attached to each of the rear end bracket mounting portion 84, the exhaust side bracket mounting portion 85, and the intake side bracket mounting portion 86.

[0052] Two case front mounting portions 81 are formed side by side in the width direction of the support base 8. The same is true for the case rear mounting portion 82. The DPF case 44a is attached to the case front mounting portion 81 and the case rear mounting portion 82 on one side in the width direction. The SCR case 45a is attached to the case front mounting portion 81 and the case rear mounting portion 82 on the other side in the width direction.

[0053] The two case front attachment portions 81 have substantially the same configuration. The two case rear attachment portions 82 have substantially the same configuration. Below, the case front attachment portion 81 and the case rear attachment portion 82 located on one side in the width direction of the support base 8 (specifically, on the DPF case 44a side) will be described as representatives.

[0054] As shown in FIGS. 4 to 7, the case front attachment portion 81 is formed with an auxiliary member attachment portion 81a and a case support portion 81b.

[0055] 6, the auxiliary member mounting portion 81a is formed in a flat plate shape that protrudes further forward from the front end of the support base 8 (first support portion 70). A first auxiliary member 87 is attached to the auxiliary member mounting portion 81a via a bolt or the like.

[0056] The first auxiliary member 87 is formed in a block shape as shown in Figures 5 and 6. The first auxiliary member 87 is attached to the auxiliary member mounting portion 81a via bolts or the like that are inserted in the vertical direction while being placed on the upper surface of the auxiliary member mounting portion 81a as shown in Figure 6. As a result, the first auxiliary member 87 is disposed so as to protrude upward from the auxiliary member mounting portion 81a as shown in Figure 4.

[0057] This first auxiliary member 87 is used to fix the front end of the DPF case 44a. Specifically, as shown in Fig. 4 and Fig. 5, the front end of the DPF case 44a is attached to the first auxiliary member 87 via a bolt or the like that is inserted in the longitudinal direction of the engine 100 in a state in which the front end of the DPF case 44a abuts against the first auxiliary member 87. In this manner, the front end of the DPF case 44a is fixed to the first auxiliary member 87.

[0058] The case support portion 81b is located at the front end of the first support portion 70. A support protrusion 81c that comes into contact with the outer peripheral surface of the DPF case 44a and supports the DPF case 44a is formed on the upper surface of the case support portion 81b. This support protrusion 81c may be formed in multiple numbers (two in this embodiment) as shown in the lower side of Fig. 6, or may be composed of a single protrusion that is elongated and continuously formed in the width direction as shown in the upper side of Fig. 6.

[0059] The front end of the DPF case 44a is attached to the first auxiliary member 87 via the support protrusion 81c without contacting the upper surface of the case support portion 81b (and thus the support base 8). In other words, as shown in FIG 5, a gap C1 is formed between the lower surface of the front end of the DPF case 44a and the upper surface of the first support portion 70.

[0060] 6 and other figures, the case rear attachment part 82 is formed in the middle of the second support part 80 in the longitudinal direction of the support base 8. The case rear attachment part 82 includes a first case attachment part (fixing part) 821 and a second case attachment part (fixing part) 822. The first case attachment part 821 and the second case attachment part 822 are arranged side by side in the longitudinal direction of the support base 8.

[0061] The first case mounting portion 821 and the second case mounting portion 822 have substantially the same configuration. Each of the first case mounting portion 821 and the second case mounting portion 822 is composed of, for example, a pair of mounting bosses arranged at an appropriate interval in the width direction of the support base 8. A mounting hole is formed in each mounting boss in the vertical direction. The interval between the mounting holes can be determined, for example, taking into consideration the outer diameters of the DPF case 44a and the SCR case 45a.

[0062] The configuration of the first case mounting portion 821 and the second case mounting portion 822 is not limited to the above configuration, and may be composed of other structures capable of fixing the second auxiliary member 88 described below, or may be formed integrally with the second auxiliary member 88.

[0063] The first case mounting portion 821 is provided forward (on the cooling fan 6 side) of the second case mounting portion 822. The first case mounting portion 821 is used when mounting the DPF case 44a, which has a relatively short length.

[0064] The second case mounting portion 822 is provided rearward (on the flywheel housing 61 side) of the first case mounting portion 821. The second case mounting portion 822 is used when mounting the DPF case 44a, which has a relatively long length.

[0065] Either the first case mounting portion 821 or the second case mounting portion 822 is alternatively selected as the location for mounting the second auxiliary member 88. This allows the support base 8 to accommodate each of the DPF cases 44a having different lengths depending on the specifications. That is, a common support base 8 can be used for DPF cases 44a with different specifications.

[0066] In the following, in the description of the attachment of the DPF case 44a, a case where the second case attachment part 822 is used will be described as a representative example. FIG.

[0067] As shown in FIG. 4 and other figures, the rear end of the DPF case 44a is attached to the case rear attachment portion 82 (second case attachment portion 822) via a second auxiliary member (attachment member) 88.

[0068] Next, a configuration for attaching the DPF case 44a to the second case attachment portion 822 will be briefly described with reference to Fig. 8 etc. Fig. 8 is a perspective view showing how the ATD 43 is attached to the support base 8.

[0069] 8, a flange portion 46 is formed at the rear end of the DPF case 44a (rear side of the SCR case 45a) so as to extend radially outward from the outer circumferential surface of the DPF case 44a. This flange portion 46 is used for mounting to the second case mounting portion 822.

[0070] The flange portion 46 can be formed, for example, by attaching a substantially annular member made of a plate member to the outer periphery of the DPF case 44a. However, without being limited thereto, the flange portion 46 may be configured, for example, to extend further downward from the outer periphery surface (i.e., a part of the outer periphery surface) on the lower side of the DPF case 44a.

[0071] An opening 71 is formed in the second support portion 80 of the support base 8 to allow the flange portion 46 to pass through. As shown in FIG. 6 and other figures, the opening 71 is between a pair of mounting holes constituting the first case mounting portion 821 and the second case mounting portion 822, and is formed so as to penetrate the support base 8 in the thickness direction.

[0072] When the DPF case 44a is placed on the support base 8, the flange portion 46 passes through the opening 71 and is exposed from below the support base 8, as shown in FIG.

[0073] 7 and other figures, the second auxiliary member 88 is formed in a long and narrow block shape. The second auxiliary member 88 is fixed to the case rear attachment portion 82 (second case attachment portion 822) so that the longitudinal direction of the second auxiliary member 88 coincides with the width direction of the engine 100.

[0074] Both longitudinal ends of the second auxiliary member 88 are attached to the case rear attachment portion 82 (second case attachment portion 822 in the example of FIG. 7) via bolts or the like that are inserted in the vertical direction.

[0075] A mounting hole for mounting the DPF case 44a (specifically, the flange portion 46) is formed in the rear end of the second auxiliary member 88. The mounting hole is open so as to face in the longitudinal direction of the engine 100.

[0076] 8, when the DPF case 44a is placed on the support base 8, the flange portion 46 of the DPF case 44a is in contact with the rear surface (the portion where the mounting hole is formed) of the second auxiliary member 88. In this state, the flange portion 46 is attached to the second auxiliary member 88 via a bolt or the like that is inserted in the longitudinal direction of the engine 100. In this manner, the rear end of the DPF case 44a is fixed to the support base 8 via the second auxiliary member 88.

[0077] In the engine 100 of this embodiment, the positions of the bolt holes formed in the flange portion 46 are determined so that, when the flange portion 46 is attached to the second auxiliary member 88, the DPF case 44a forms a gap C2, as shown in FIG. 5, between the second support portion 80 and the flange portion 46.

[0078] 5, when the DPF case 44a is placed on the support base 8, only a portion of the front end of the DPF case 44a comes into direct contact with the support base 8 (support protrusions 81c). That is, the DPF case 44a is supported in a state where it is substantially floating above the support base 8. As a result, air (wind) generated by the rotating cooling fan 6 can flow through gaps C1, C2 between the outer circumferential surface of the DPF case 44a and the upper surface of the support base 8. As a result, the ATD 43 has a good heat dissipation effect.

[0079] 6, the second support portion 80 of the support base 8 of this embodiment is formed with a plurality of ventilation windows 72 (eight in this embodiment). The ventilation windows 72 are formed so as to penetrate the support base 8 in the thickness direction. This can further enhance the heat dissipation effect of the ATD 43.

[0080] In the support base 8 of the present embodiment, a plurality of triangular ventilation windows 72 are arranged side by side. However, the shape and number of the ventilation windows 72 are not particularly limited. For example, slit-shaped ventilation windows may be formed.

[0081] 8 and other figures, the front end bracket attachment portion 83 is formed at the front end of the support base 8 so as to protrude further downward from the lower side surface of the support base 8. A plurality of front end bracket attachment portions 83 (two in this embodiment) are formed at a predetermined distance apart in the width direction of the support base 8. The front end bracket attachment portion 83 may be formed, for example, in a substantially cylindrical shape or a substantially funnel shape, and its shape is not particularly limited.

[0082] Mounting holes for inserting bolts or the like from below are formed in the underside of the front-end bracket mounting portion 83. As shown in Fig. 9, these mounting holes are formed to correspond to the positions of upper and lower mounting bosses 91a formed on a front support bracket 91, which will be described later.

[0083] The front end bracket attachment portion 83 is not limited to the above configuration, and may be formed, for example, from a through hole that passes through the support base 8 in the vertical direction, or may be formed from another attachment structure.

[0084] 4 and 8, the rear end bracket attachment portion 84 is formed in a generally cylindrical shape that protrudes further rearward at the rear end of the support base 8. A plurality of rear end bracket attachment portions 84 (three in this embodiment) are formed at predetermined intervals in the width direction of the support base.

[0085] A mounting hole for inserting a bolt or the like from the horizontal rear side is formed in the rear-end bracket mounting portion 84. As shown in Fig. 10, this mounting hole is formed to correspond to the position of a horizontal hole of a horizontal mounting boss 92a formed in a rear support bracket 92 described below.

[0086] The exhaust side bracket mounting portion 85 is disposed at the end of the support base 8 on the side where the DPF case 44a is mounted in the width direction of the support base 8. The exhaust side bracket mounting portion 85 is formed in a generally cylindrical shape that protrudes further downward from the lower surface of the support base 8. A plurality of exhaust side bracket mounting portions 85 (two in this embodiment) are formed at a predetermined distance apart in the longitudinal direction of the support base 8.

[0087] An attachment hole for inserting a bolt or the like from above is formed in the exhaust side bracket attachment portion 85. As shown in Fig. 10, this attachment hole is formed to correspond to the position of an attachment hole formed in the exhaust side support bracket 93 described later.

[0088] The intake side bracket mounting portion 86 is disposed at the end of the support base 8 on the side where the SCR case 45a is attached in the width direction of the support base 8. Similar to the exhaust side bracket mounting portion 85, the intake side bracket mounting portion 86 is formed in a generally cylindrical shape that protrudes further downward from the lower surface of the support base 8. A plurality of intake side bracket mounting portions 86 (two in this embodiment) are formed at a predetermined distance apart in the longitudinal direction of the support base 8.

[0089] An attachment hole for inserting a bolt or the like from above is formed on the underside of the intake side bracket attachment portion 86. As shown in Fig. 9, this attachment hole is formed to correspond to the position of an attachment hole formed in the intake side support bracket 94, which will be described later.

[0090] It is preferable that the exhaust side bracket mounting portion 85 and the intake side bracket mounting portion 86 are formed at positions that are not symmetrical to each other in the width direction of the support base 8. In other words, it is preferable that the exhaust side bracket mounting portion 85 and the intake side bracket mounting portion 86 are disposed at different positions in the longitudinal direction of the support base 8.

[0091] In this embodiment, the exhaust side bracket mounting portion 85 is formed slightly rearward of the support base 8 in the longitudinal direction, and the intake side bracket mounting portion 86 is formed slightly forward of the support base 8 in the longitudinal direction.

[0092] As a result, when the support base 8 is supported via the exhaust side support bracket 93 and the intake side support bracket 94 described below, even if the exhaust side support bracket 93 and the intake side support bracket 94 are small, the support base 8 (and thus the ATD 43) can be supported in a balanced and stable manner.

[0093] The positions of the above-mentioned mounting parts (places where bolts are inserted) can be appropriately set so as to suitably support the support base 8. The predetermined distance at the front end bracket mounting part 83, the predetermined distance at the rear end bracket mounting part 84, the predetermined distance at the exhaust side bracket mounting part 85, and the predetermined distance at the intake side bracket mounting part 86 may be set to the same value or to different values.

[0094] Next, the support bracket 9 for attaching the support base 8 to the engine body 1 will be described with reference to Figures 9 and 10 etc. Figure 9 is an exploded perspective view showing how a front support bracket 91 and an intake side support bracket 94 are attached to the engine body 1. Figure 10 is an exploded perspective view showing how a rear support bracket 92 and an exhaust side support bracket 93 are attached to the engine body 1.

[0095] The support bracket 9 includes a front support bracket (first support bracket) 91, a rear support bracket (second support bracket) 92, an exhaust side support bracket (third support bracket) 93, and an intake side support bracket (fourth support bracket) 94. Each of the front side support bracket 91, the rear side support bracket 92, the exhaust side support bracket 93, and the intake side support bracket 94 is formed from, for example, a casting.

[0096] The front support bracket 91 is formed in a block shape as shown in Fig. 9. The front support bracket 91 is attached to the engine body 1 on the cooling fan 6 side, and supports the support stand 8.

[0097] A plurality of mounting holes are formed in the lower part of the front support bracket 91 for inserting bolts in the longitudinal direction of the engine 100. The front support bracket 91 is fixed to the engine body 1 by inserting bolts or the like in the longitudinal direction of the engine 100 while aligning the plurality of mounting holes with holes formed in corresponding positions of the engine body 1 (e.g., the cylinder head 13), as shown in Fig. 9.

[0098] A plurality of upper and lower mounting bosses (upper and lower mounting portions) 91a are formed on the upper side of the front support bracket 91 according to the positions and number of the front end bracket mounting portions 83. Each of the upper and lower mounting bosses 91a has upper and lower holes into which a bolt or the like can be inserted in the vertical direction. The upper surfaces of the upper and lower mounting bosses 91a come into contact with the lower surface of the front end bracket mounting portion 83 of the support base 8, thereby serving as positioning surfaces for positioning the support base 8 in the vertical direction.

[0099] The support base 8 is fixed to the front support bracket 91 by aligning each of the upper and lower holes with the mounting holes formed in each of the above-mentioned multiple front end bracket mounting portions 83 and inserting bolts or the like in the vertical direction to attach the support base 8 to the front support bracket 91.

[0100] The rear support bracket 92 is formed in a block shape as shown in Fig. 10. The rear support bracket 92 is attached to the engine body 1 on the flywheel housing 61 side, and supports the support base 8.

[0101] A plurality of mounting holes are formed on the underside of the rear support bracket 92 for inserting bolts or the like in the longitudinal direction of the engine 100. The rear support bracket 92 is fixed to the engine body 1 by inserting bolts or the like in the longitudinal direction of the engine 100 in a state in which the plurality of mounting holes are aligned with holes formed at corresponding positions in the engine body 1 (e.g., the cylinder head 13), as shown in Fig. 10.

[0102] A plurality of horizontal mounting bosses (horizontal mounting portions) 92a are formed on the upper end of the rear support bracket 92 in correspondence with the positions and number of the rear end bracket mounting portions 84. Each horizontal mounting boss 92a is formed with a horizontal hole into which a bolt or the like can be inserted in the longitudinal direction of the engine 100. The front surface of the horizontal mounting boss 92a comes into contact with the rear surface of the rear end bracket mounting portion 84 of the support base 8, thereby forming a positioning surface for positioning the support base 8 in the longitudinal direction.

[0103] The support base 8 is fixed to the rear support bracket 92 by aligning the horizontal hole formed in the horizontal mounting boss 92a with the mounting holes formed in each of the multiple case rear mounting portions 82 described above, and then inserting a bolt or the like horizontally.

[0104] 10, the exhaust-side support bracket 93 is disposed on the exhaust side, where the exhaust manifold 42 is disposed, in the width direction of the engine 100. The exhaust-side support bracket 93 is composed of two parts disposed at different heights.

[0105] The exhaust side support bracket 93 includes a support base side block (second part) 96 and an engine main body side block (first part) 97 .

[0106] As shown in Fig. 10, the support base side block 96 is disposed above the engine body side block 97. An attachment hole is formed at the lower end of the support base side block 96 for connecting to the engine body side block 97. The attachment hole is formed so that a bolt or the like is inserted in the width direction of the engine 100. An attachment hole is formed at the upper end of the support base side block 96 for attaching to the support base 8. The attachment hole is formed so that a bolt or the like is inserted in the vertical direction.

[0107] As shown in Fig. 10, the engine body side block 97 is disposed below the support base side block 96. An attachment hole is formed at the upper end of the engine body side block 97 for inserting a bolt or the like in the width direction of the engine 100. This attachment hole is used to connect the engine body side block 97 to the support base side block 96. An attachment hole is formed at the lower end of the engine body side block 97 for inserting a bolt or the like in the width direction of the engine 100. This attachment hole is used to attach the engine body side block 97 to the engine body 1 (specifically, the cylinder head 13).

[0108] The support base side block 96 is fixed to the engine body side block 97 by aligning a mounting hole formed at its lower end with a mounting hole formed at the upper end of the engine body side block 97 and attaching a bolt or the like.

[0109] In this way, the exhaust-side support bracket 93 is configured to connect the support base 8 to the cylinder head 13. By attaching the exhaust-side support bracket 93 to the cylinder head 13, which is a large block-shaped component, the support base 8 and the ATD 43 can be stably supported.

[0110] The exhaust side support bracket 93 configured as described above is fixed to the engine body 1 by attaching a bolt or the like while aligning a mounting hole formed on the underside of the engine body side block 97 with a hole formed at a corresponding position on the engine body 1, as shown in FIG. 10.

[0111] 9, the intake side support bracket 94 is disposed on the intake side where the intake manifold 23 is disposed in the width direction of the engine 100. The intake side support bracket 94 is composed of two parts disposed at different heights.

[0112] The intake side support bracket 94 includes an upper block (second part) 98 and a lower block (first part) 99 .

[0113] As shown in Fig. 9, the upper block 98 is disposed above the lower block 99. An attachment hole is formed at the lower end of the upper block 98 for connecting to the lower block 99. The attachment hole is formed so that a bolt or the like is inserted in the width direction of the engine 100. An attachment hole is formed at the upper end of the upper block 98 for attaching to the support base 8. The attachment hole is formed so that a bolt or the like is inserted in the vertical direction.

[0114] As shown in Fig. 9, the lower block 99 is disposed below the upper block 98. An attachment hole is formed at the upper end of the lower block 99 for inserting a bolt or the like in the width direction of the engine 100. This attachment hole is used to connect the lower block 99 to the upper block 98. An attachment hole is formed at the lower end of the lower block 99 for inserting a bolt or the like in the width direction of the engine 100. This attachment hole is used to attach the lower block 99 to the engine body 1 (specifically, the cylinder block 12).

[0115] The upper block 98 is fixed to the lower block 99 by attaching a bolt or the like while aligning a mounting hole formed at its lower end with a mounting hole formed at the upper end of the lower block 99.

[0116] In this manner, the intake side support bracket 94 is configured to connect the support base 8 to the cylinder block 12. By attaching the intake side support bracket 94 to the cylinder block 12, which is a large block-shaped component, the support base 8 and the ATD 43 can be stably supported.

[0117] The intake side support bracket 94 configured as described above is fixed to the engine body 1 by attaching a bolt or the like while aligning a mounting hole formed on the underside of the lower block 99 with a hole formed at a corresponding position on the engine body 1 (e.g., the cylinder block 12), as shown in FIG. 9.

[0118] In the manner described above, the front support bracket 91, the rear support bracket 92, the exhaust side support bracket 93, and the intake side support bracket 94 are attached to the engine body 1.

[0119] As shown in FIG. 3, in the front support bracket 91, a bolt or the like is inserted vertically from below to attach the front support bracket 91, whereby the front end bracket attachment portion 83 of the support base 8 is fixed to the front support bracket 91.

[0120] An intake side support bracket 94 of the support base 8 is fixed to the rear support bracket 92 by inserting a bolt or the like horizontally into the rear support bracket 92.

[0121] The exhaust side support bracket 93 and the intake side support bracket 94 are attached by inserting bolts or the like in the vertical direction from above, so that the exhaust side bracket mounting portion 85 and the intake side bracket mounting portion 86 of the support base 8 are fixed to the exhaust side support bracket 93 and the intake side support bracket 94, respectively.

[0122] In this way, the support base 8 is supported by the engine body 1 in a state where it is positioned above the engine body 1. The elongated ATD 43 is arranged along the longitudinal direction of the engine 100 and fixed to the support base 8. This makes it possible to shorten the width of the engine 100 even if the length of the ATD 43 varies as described above depending on the specifications of the engine 100. Therefore, the engine 100 of this embodiment can be made compact in the width direction, and is suitable for application to, for example, a small tractor or the like that needs to house the engine inside a narrow bonnet.

[0123] In the engine 100 of this embodiment, when the support base 8 is attached to the engine body 1, the front support bracket 91 and the rear support bracket 92 are attached to the engine body 1 in advance, and then the support base 8 is attached to the front support bracket 91 and the rear support bracket 92. Thereafter, the exhaust side support bracket 93 and the intake side support bracket 94 are attached to the engine body 1 and the support base 8.

[0124] In this way, the front support bracket 91 can position the support base 8 in the up-down direction, and the rear support bracket 92 can position the support base 8 in the longitudinal direction of the engine 100. Therefore, when the support base 8 of the ATD 43 is attached above the engine body 1, the three-dimensional attachment position can be determined easily and accurately. That is, the support base 8 can be easily attached to an accurate position without requiring a positioning jig for the support base 8.

[0125] In this embodiment, the upper and lower mounting bosses 91a are disposed on the front support bracket 91, not on the rear support bracket 92. Therefore, even if the front support bracket 91 is located between the cooling fan 6 and the engine body 1 as shown in Fig. 3, the cooling fan 6 is unlikely to get in the way when inserting bolts to attach the support base 8 to the front support bracket 91, etc. This improves assembly workability.

[0126] After the front support bracket 91 and the rear support bracket 92 are attached, the exhaust side support bracket 93 and the intake side support bracket 94 are attached. Both the exhaust side support bracket 93 and the intake side support bracket 94 are configured to be divided in the height direction, and appropriate play is formed in the mounting holes for connecting the upper and lower parts to each other with bolts. Therefore, the support base 8, which is accurately positioned by the front support bracket 91 and the rear support bracket 92, can be supported by the exhaust side support bracket 93 and the intake side support bracket 94 without rattling or the like.

[0127] Next, a description will be given of a sensor support structure provided in the engine 100 of this embodiment. This support structure can suppress the influence of the heat of the ATD 43 on the sensors.

[0128] The sensor support structure primarily consists of a sensor support bracket 60 with a spacer 62 .

[0129] As shown in FIG. 11, the sensor support bracket 60 is formed in a generally gate shape when viewed in the width direction of the engine 100, and is attached to the end of the DPF case 44a on the exhaust gas outlet side (flywheel housing 61 side).

[0130] A differential pressure sensor 48 that detects, for example, a pressure difference between the upstream and downstream sides of a filter included in the DPF device 44 is supported on the upper surface of the sensor support bracket 60. A temperature sensor 49 that detects the temperature of the ATD 43 is attached to the side surface of the sensor support bracket 60 opposite the DPF case 44a in the longitudinal direction of the engine 100 (DPF device 44).

[0131] In the longitudinal direction of the engine 100 (DPF device 44), on the side of the sensor support bracket 60 facing the DPF case 44a, multiple spacers 62 (two in this embodiment) are provided to position the sensor support bracket 60 a predetermined distance away from the DPF case 44a.

[0132] The spacers 62 are, for example, arranged side by side in the width direction of the engine 100, and are formed integrally with the sensor support bracket 60 by welding or the like. The spacer 62 is, for example, formed in a cylindrical shape, and also functions as an attachment portion for attaching the sensor support bracket 60 to the DPF case 44a.

[0133] The sensor support bracket 60 is attached to the stiffener 47 of the DPF case 44a by bolts or the like via a spacer 62. One side of the sensor support bracket 60 in the width direction of the engine 100 (for example, the end on the intake side) is fixed by bolts or the like to a frame 50 provided separately from the ATD 43. This allows the sensor support bracket 60 to be attached in a stable position.

[0134] The stiffener 47 is formed by extending further radially outward (upward in this embodiment) from the outer circumferential surface of the DPF case 44a. The stiffener 47 can be formed, for example, by attaching a flange member made of a plate member to the outer periphery of the DPF case 44a.

[0135] This allows the sensor support bracket 60 to be attached at a position separated from the outer circumferential surface of the DPF case 44a, thereby making it possible to suppress the influence of radiant heat from the DPF case 44a.

[0136] As described above, since the sensor support bracket 60 is attached to the stiffener 47 via the spacer 62, the area of ​​direct connection between the sensor support bracket 60 and the DPF case 44a can be limited to the size of the spacer 62. Therefore, the direct transfer of heat generated in the DPF case 44a to the sensor support bracket 60 can be suppressed.

[0137] That is, the above-described heat insulating support structure can prevent damage to sensors such as the differential pressure sensor 48 caused by heat from the DPF case 44a. The sensors can also be disposed near the ATD 43, which allows for compact wiring and improved freedom in layout of the sensors.

[0138] As described above, the engine 100 of this embodiment has the ATD 43 that purifies exhaust gas. The engine 100 includes the engine body 1, the support base 8, the front support bracket 91, and the rear support bracket 92. The support base 8 supports the ATD 43. The front support bracket 91 is disposed on one side of the engine body 1 and attached to the engine body 1, and supports the support base 8. The rear support bracket 92 is disposed on the opposite side of the engine body 1 to the front support bracket 91 and attached to the engine body 1, and supports the support base 8. The front support bracket 91 is disposed on one side of the engine body 1, and has upper and lower mounting bosses 91a that are attached in the vertical direction to the support base 8. The rear support bracket 92 is disposed on the opposite side of the engine body 1 to the front support bracket 91, and has a horizontal mounting boss 92a that is attached in the horizontal direction to the support base 8.

[0139] This allows the ATD 43 to be easily supported above the engine body 1. Also, by supporting the support base 8 from both sides of the engine body 1, the support base 8 can be supported in a stable state. By distributing the upper and lower mounting bosses 91a and the horizontal mounting boss 92a to the front support bracket 91 and the rear support bracket 92, the position of the support base 8 (and therefore the ATD 43) can be accurately determined without the need for a positioning jig. This results in good assembly workability.

[0140] Moreover, the engine 100 of this embodiment includes a flywheel and a cooling fan 6. The cooling fan 6 rotates for cooling. The cooling fan 6 and the flywheel are disposed on opposite sides of the engine body 1. The front support bracket 91 is disposed on the cooling fan 6 side. The rear support bracket 92 is disposed on the flywheel side.

[0141] As a result, the support base 8 is attached to the front support bracket 91 in the vertical direction, so that the cooling fan 6 is unlikely to get in the way when inserting the bolts to attach the support base 8. Therefore, the support base 8 can be easily fixed to the front support bracket 91 fixed to the engine body 1.

[0142] Moreover, the engine 100 of this embodiment includes an exhaust side support bracket 93 and an intake side support bracket 94. The exhaust side support bracket 93 is disposed on a side (exhaust side) of the engine body 1 different from both the side on which the front support bracket 91 and the side on which the rear support bracket 92 are disposed. The intake side support bracket 94 is disposed on the opposite side (intake side) of the engine body 1 to the exhaust side support bracket 93. The exhaust side support bracket 93 is composed of a support base side block 96 and an engine body side block 97 arranged in a direction connecting the engine body 1 and the support base 8. The intake side support bracket 94 is composed of an upper block 98 and a lower block 99 arranged in a direction connecting the engine body 1 and the support base 8.

[0143] This allows the support base 8 to be supported on four sides, realizing even more stable support. Also, by configuring the exhaust side support bracket 93 and the intake side support bracket 94 to allow positional changes between the components, the support base 8 can be well supported while maintaining the positioning of the support base 8 by the front side support bracket 91 and the rear side support bracket 92.

[0144] Moreover, the engine 100 of this embodiment includes a second auxiliary member 88. The second auxiliary member 88 is used to attach the ATD 43 to the support base 8. The support base 8 is provided with a first case attachment portion 821 and a second case attachment portion 822 to which the second auxiliary member 88 can be fixed.

[0145] This allows the mounting position of the ATD 43 relative to the support base 8 to be changed in stages, so that a common support base 8 can be used for a variety of specifications of ATD 43. As a result, it is possible to reduce manufacturing costs and the effort required for parts management.

[0146] Next, a modified support base 8x will be described with reference to Figs. 12 and 13. Fig. 12 is a perspective view showing the configuration of the modified support base 8x. Fig. 13 is a perspective view showing the ATD 43 attached to the modified support base 8x. In the description of this modified example, the same reference numerals are used in the drawings to designate the same or similar members as those in the above-described embodiment, and descriptions thereof may be omitted.

[0147] As shown in FIG. 12, the support base 8x of the modified example is made up of a main body portion 73, a front auxiliary member 74, a rear protrusion portion 75, and a side mounting portion .

[0148] The main body 73 is made of a generally plate-shaped casting, and is formed in a rectangular (square) shape in plan view. A plurality of ventilation windows 72 are formed in the middle of the main body 73. A front auxiliary member 74 is attached to the front of the main body 73 (the cooling fan 6 side of the engine 100) via bolts or the like.

[0149] The front auxiliary member 74 is formed in a block shape substantially identical to the first auxiliary member 87 of the above embodiment. The front auxiliary member 74 is used to fix the front end of the DPF case 44a (SCR case 45a). Specifically, like the above first auxiliary member 87, the front end of the DPF case 44a (SCR case 45a) is attached to the front auxiliary member 74 via a bolt or the like that is inserted in the longitudinal direction of the DPF case 44a (SCR case 45a) with the front end abutting against the front auxiliary member 74.

[0150] The case support portion 81b of the above embodiment is formed on the front auxiliary member 74. When the DPF case 44a (SCR case 45a) is attached to the front auxiliary member 74, the case support portion 81b contacts the outer peripheral surface of the front end of the DPF case 44a (SCR case 45a) and supports the DPF case 44a (SCR case 45a) so that the DPF case 44a (SCR case 45a) does not contact the upper surface of the main body portion 73. As a result, a gap is formed between the lower surface of the front end of the DPF case 44a (SCR case 45a) and the upper surface of the main body portion 73.

[0151] The rear protrusion 75 is formed on the rear side of the main body 73 (the flywheel housing 61 side of the engine 100) so as to protrude further upward from the upper surface of the main body 73. When the DPF case 44a (SCR case 45a) is attached to the support base 8x, the rear protrusion 75 contacts the outer peripheral surface of the rear end of the DPF case 44a (SCR case 45a) and supports the DPF case 44a (SCR case 45a) so that the DPF case 44a (SCR case 45a) does not contact the upper surface of the main body 73. As a result, a gap is formed between the lower surface of the rear end of the DPF case 44a (SCR case 45a) and the upper surface of the main body 73.

[0152] With this configuration, the support base 8x can also support the DPF case 44a (SCR case 45a) in a state where it is substantially floating above the support base 8x, thereby improving the heat dissipation effect.

[0153] Furthermore, when attaching the DPF case 44a (SCR case 45a) to the support base 8x, there is no need to use a band or other member to wrap around the outer periphery of the case. Therefore, there is no need to provide the DPF case 44a (SCR case 45a) with a structure to increase the rigidity to withstand the tightening of the band, which allows for cost reduction.

[0154] In the longitudinal direction of the engine 100, a mounting hole for fixing the DPF case 44a (SCR case 45a) is formed in the side surface of the rear protrusion 75 on the flywheel housing 61 side (that is, the rear surface of the support base 8x).

[0155] With the DPF case 44a (SCR case 45a) placed on the support base 8x, the flange portion 46 of the DPF case 44a (SCR case 45a) comes into contact with the rear surface of the support base 8x (the portion where the mounting holes are formed) as shown in Fig. 13. With the flange portion 46 of the DPF case 44a (SCR case 45a) in contact with the rear surface of the support base 8x, the flange portion 46 (i.e., the DPF case 44a and the SCR case 45a) are fixed to the support base 8x via bolts or the like that are inserted in the longitudinal direction of the engine 100.

[0156] The side mounting portion 76 is formed in a substantially L-shape when viewed in the longitudinal direction of the engine 100, and is used to fix the support base 8x to the engine body 1. The side mounting portion 76 is disposed on each of both sides of the support base 8x in the width direction of the engine 100.

[0157] A plurality of mounting holes are formed on each of the side surfaces of the side mounting portion 76 in the width direction and height direction of the engine 100. The side mounting portion 76 is fixed to the support base 8x via bolts or the like that are inserted into mounting holes formed on the side surface of the engine 100 in the width direction. The side mounting portion 76 is fixed to the engine body 1 via bolts or the like that are inserted into mounting holes formed on the side surface of the engine 100 in the height direction. In this manner, the support base 8x can be easily attached to the engine body 1.

[0158] Although the preferred embodiment of the present invention has been described above, the above configuration can be modified, for example, as follows.

[0159] Instead of being boss-shaped, the upper and lower mounting bosses 91a may simply be configured as mounting holes formed in the front support bracket 91. Similarly, instead of being boss-shaped, the horizontal mounting boss 92a may simply be configured as mounting holes formed in the rear support bracket 92.

[0160] The front support bracket 91 may be formed with a horizontal mounting boss, and the rear support bracket 92 may be formed with upper and lower mounting bosses.

[0161] The shapes of the front support bracket 91, the rear support bracket 92, the exhaust side support bracket 93, and the intake side support bracket 94 can be modified as appropriate, taking into consideration interference with other parts, etc.

[0162] At least one of the exhaust side support bracket 93 and the intake side support bracket 94 may be omitted.

[0163] The ends of the DPF case 44a and the SCR case 45a on the flywheel housing 61 side may be directly attached to the case rear attachment part 82. The case rear attachment part 82 may be changed to another shape, for example, a plate-like member whose fixed position in the longitudinal direction of the support base 8 can be changed.

[0164] The case rear attachment portion 82 may include three or more case attachment portions (fixing portions) arranged in the longitudinal direction of the support base 8.

[0165] If necessary, the second auxiliary member 88 may be attached to the upper side of the support base 8. In this case, the shape of the second auxiliary member 88 can be appropriately changed.

[0166] The ATD 43 may be composed of only the DPF device 44 .

[0167] When viewed from above, the longitudinal direction of the approximately rectangular engine 100 may be perpendicular to the extension direction of the crankshaft 10. Also, when viewed from above, the engine 100 may be approximately square. [Explanation of symbols]

[0168] 1 Engine body 8 Support stand 43 ATD (Exhaust Gas Purification Device) 91 Front support bracket 91a Top and bottom mounting bosses 92 Rear support bracket 92a Horizontal mounting boss 100 Engine

Claims

1. An engine having an exhaust gas purification device for purifying exhaust gas, The engine body, A support base for supporting the exhaust gas purification device, the support base has a curved portion provided below an outer circumferential surface of the exhaust gas purification device, and has a bracket attachment portion below the curved portion, the bracket attachment portion is fixed in a vertical direction to a bracket attached to a side surface of an engine body located on one side in a longitudinal direction of the exhaust gas purification device, The bracket is included in a plurality of brackets that are arranged on opposite sides of the engine body in the longitudinal direction of the exhaust gas purification device and are attached to the engine body.

2. The engine of claim 1 , wherein the curved portion of the support platform supports the exhaust gas purification device.

3. The support base is attached to the engine body via a plurality of the brackets, The engine according to claim 1 or 2, wherein one of the plurality of brackets is attached to the support base in a vertical direction.

4. 4. The engine of claim 3, wherein said one bracket is further mounted horizontally to said engine body.

5. 5. The engine according to claim 4, wherein a mounting position of said one bracket to said engine body is closer to said engine body than a mounting position of said bracket to said support base.

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