engine

Abstract

To provide an engine capable of easily supporting an exhaust emission control device on the upper side of an engine body.SOLUTION: An engine includes an exhaust emission control device for purifying exhaust gas. The engine includes an engine body and a support table that supports the exhaust emission control device. The support table includes a bent part. A bracket is provided on the lower side of the support table. The bracket is disposed on the side opposite to the engine body in a sandwiching manner in the longitudinal direction of the exhaust emission control device and is 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. Specifically, it relates to a configuration for attaching the exhaust gas purification device to the engine.

Background Art

[0002] Conventionally, a configuration for purifying the exhaust gas of an engine using an exhaust gas purification device has been known. Patent Document 1 discloses a construction machine having this type of configuration.

[0003] The construction machine of Patent Document 1 has a configuration in which an engine and an exhaust gas purification device provided separately from the engine are arranged in an engine room, and the exhaust gas purification device is supported above a hydraulic pump by a support member.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the configuration of Patent Document 1 described above, since the exhaust gas purification device is provided separately from the engine, a layout space for the engine and the exhaust gas purification device is required. From the perspective of space saving, a structure in which the exhaust gas purification device is arranged above the engine and the exhaust gas purification device is supported by the engine has been proposed. However, due to the complex structure of the engine body, an attachment structure that can easily attach the exhaust gas purification device to the engine body has been desired.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide an engine that can easily support an exhaust gas purification device above an engine body.

Means for Solving the Problems

[0007] An engine according to one aspect of the present invention is an engine having an exhaust gas purification device for purifying exhaust gas, comprising an engine body and a support base for supporting the exhaust gas purification device, wherein the support base has a curved portion, a bracket is provided below the support base, and the bracket is attached to the engine body, with the bracket positioned on opposite sides of the engine body in the longitudinal direction of the exhaust gas purification device. [Effects of the Invention]

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

[0009] [Figure 1] A perspective view showing the configuration of an engine according to one embodiment of the present invention. [Figure 2] A conceptual diagram showing the intake and exhaust airflow in an engine. [Figure 3] An exploded perspective view showing how the ATD and support stand are attached to the engine body. [Figure 4] Exploded perspective view showing the ATD and support base. [Figure 5] Perspective view showing the ATD and support base. [Figure 6] An exploded perspective view showing how the first auxiliary member is attached to the support base. [Figure 7] An exploded perspective view showing how the second auxiliary member is attached to the support base. [Figure 8] A perspective view showing how the ATD is attached to the support base. [Figure 9] An exploded perspective view showing how the front support bracket and intake side support bracket are attached to the engine body. [Figure 10] An exploded perspective view showing how the rear support bracket and exhaust side support bracket are attached to the engine body. [Figure 11] A perspective view showing the sensor support bracket. [Figure 12]A perspective view showing the configuration of the support base in a modified example. [Figure 13] A perspective view showing the ATD mounted on a modified support stand. [Modes for carrying out the invention]

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

[0011] The engine 100 shown in Figure 1 is a diesel engine, which is installed in agricultural machinery such as tractors and construction machinery such as skid steer loaders. The engine 100 is configured as, for example, an inline four-cylinder engine having four cylinders. However, the number of cylinders is not limited to four.

[0012] First, the basic configuration of the engine body 1 of engine 100 will be described. In the following description, the vertical direction of engine 100 as shown in Figure 1 will be referred to as the height direction. Engine 100 is a long, narrow rectangle in plan view, and its longitudinal direction coincides with the direction in which the crankshaft 10 extends. In the following description, when referring to the longitudinal direction of engine 100, it means the direction of the axis of rotation of the crankshaft 10. Furthermore, the direction perpendicular to both the height direction and the longitudinal direction will be referred to as the width direction of engine 100. The height direction of 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 Figure 1, the engine body 1 mainly consists of an oil pan 11, a cylinder block 12, a cylinder head 13, and a head cover 14, arranged from bottom to top.

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

[0015] The cylinder block 12 is attached above the oil pan 11. A recess for accommodating the crankshaft 10 and the like is formed in the lower part of the cylinder block 12. 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 accommodated in each cylinder 30. The piston inside the cylinder 30 can move in the vertical direction. 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] As shown in FIG. 1 and the like, the cylinder head 13 is attached above the cylinder block 12. The combustion chamber 31 shown in FIG. 2 is formed corresponding to each cylinder 30 by the cylinder head 13 and the cylinder block 12.

[0018] The head cover 14 is provided above the cylinder head 13. Inside the head cover 14, a valve operating mechanism including a push rod and a rocker arm (not shown) for operating an intake valve and an exhaust valve (not shown) is accommodated.

[0019] A cooling fan 6 is rotatably attached to one side in the longitudinal direction of the engine 100. The cooling fan 6 rotates when the power of the crankshaft 10 is transmitted. By rotating, the cooling fan 6 generates an air flow, passes the air through a radiator (not shown) for cooling the cooling water of the engine 100, and blows air onto the engine 100. As a result, the engine 100 is cooled.

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

[0021] Next, the configuration of the engine 100 of this embodiment will be briefly described with reference to Figure 2, focusing on the intake and exhaust airflow.

[0022] As shown in Figure 2, the engine 100 mainly consists of an intake section 2, a power generation section 3, and an exhaust section 4.

[0023] The intake section 2 draws in air from the outside. The intake section 2 comprises 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, allowing air drawn in from the outside to flow into the interior.

[0025] The throttle valve 22 is located in the middle of the intake passage. The throttle valve 22 changes its opening degree according to a control command from a control device (not shown), thereby changing the cross-sectional area of ​​the intake passage. This allows the amount of air supplied to the intake manifold 23 to be adjusted.

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

[0027] The power generation unit 3 is composed of a plurality of (four in this embodiment) cylinders 30. The power generation unit 3 generates power to cause a piston to reciprocate by burning fuel in the combustion chamber 31 formed in each cylinder 30.

[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, enabling the piston to reciprocate up and down. The power thus obtained is transmitted via the crankshaft 10 or the like to an appropriate device downstream of the power source.

[0029] As shown in Figure 2, the supercharger 24 comprises 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 way, as the turbine 25 rotates using the exhaust gas discharged from the combustion chamber 31, the compressor 27 rotates, compressing the air purified by an air cleaner (not shown) and forcibly drawing it in.

[0030] The exhaust section 4 discharges exhaust gas generated in the combustion chamber 31 to the outside. The exhaust section 4 comprises 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, through which exhaust gas discharged from the combustion chamber 31 can flow. The exhaust pipe 41 comprises a supercharger inlet pipe 51, a connecting pipe 52, and an outlet pipe 53.

[0032] The exhaust manifold 42 is connected to the upstream end of the exhaust pipe 41 in the direction of exhaust gas flow. 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 inlet pipe 51).

[0033] As shown in Figure 1, the exhaust manifold 42 is attached to the lateral surface of the cylinder head 13, which is generally formed in the shape of a rectangular parallelepiped. Hereinafter, the side of the engine body 1 to which the exhaust manifold 42 is attached may be referred to as the exhaust side. On the other hand, the intake manifold 23 is attached to the lateral surface of the cylinder head 13, opposite to the exhaust manifold 42. Hereinafter, the side of the engine body 1 to 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 from the exhaust manifold 42 passes through the turbocharger inlet pipe 51 and flows to the turbocharger 24. After driving the turbine 25 of the turbocharger 24, the exhaust gas passes through the connecting pipe 52 and flows to the ATD 43.

[0035] The ATD43 is a device that performs aftertreatment of exhaust gases. The ATD43 is located in the middle of the exhaust pipe 41. The ATD43 purifies exhaust gases by removing harmful components such as NOx (nitrogen oxides), CO (carbon monoxide), HC (hydrocarbons), and particulate matter contained in the exhaust gas.

[0036] The ATD43 includes a DPF device 44 and an SCR device 45. DPF stands for Diesel Particulate Filter. SCR stands for Selective Catalytic Reduction.

[0037] The DPF device 44 removes carbon monoxide, nitric oxide, particulate matter, etc., contained in the exhaust gas via an oxidation catalyst (not shown) and a filter, which are housed in the DPF case 44a shown in Figure 1, etc. The oxidation catalyst is made of platinum or the like and is a catalyst for oxidizing (combusting) unburned fuel, carbon monoxide, nitric oxide, etc., contained in the exhaust gas. The filter is located downstream of the oxidation catalyst from the exhaust gas and is configured, for example, as a fall-flow type filter. The filter collects particulate matter contained in the exhaust gas that has been treated by the oxidation catalyst.

[0038] As shown in Figures 1 and 3, the DPF case 44a is composed of an elongated, roughly cylindrical hollow member. The DPF case 44a is mounted on the upper side of the engine body 1 such that its longitudinal direction is parallel to the longitudinal direction of the engine 100. The DPF case 44a is positioned on the exhaust side (the side where the supercharger 24 and exhaust manifold 42 are located) in the width direction of the engine 100, compared to the SCR case 45a, which will be described later.

[0039] Inside the DPF device 44, exhaust gas flows from the side closer to the cooling fan 6 towards the side closer to the flywheel housing 61. After passing through the DPF device 44, the exhaust gas flows into the connecting pipe 54. The connecting pipe 54 has a straight section that is roughly 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 towards 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). After that, the exhaust gas flows from the connecting pipe 54 to the SCR device 45.

[0040] The SCR device 45 removes NOx contained in exhaust gas via an SCR catalyst and a slip catalyst housed in the SCR case 45a shown in Figure 1, etc. The SCR catalyst is made of a material such as ceramic that adsorbs ammonia. NOx contained in exhaust gas is reduced to nitrogen and water when it comes into contact with the SCR catalyst that has adsorbed ammonia. 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, converting it into nitrogen and water.

[0041] As shown in Figure 1, the SCR case 45a, like the DPF case 44a, is composed of an elongated, roughly cylindrical, hollow member. The SCR case 45a is mounted on the upper side of the engine body 1 such that its longitudinal direction is parallel to the longitudinal direction of the engine 100. The SCR case 45a is mounted on the intake side in the width direction of the engine 100 compared to the DPF case 44a. That is, the DPF case 44a and the SCR case 45a are mounted side by side in the width direction of the engine 100.

[0042] Inside the SCR device 45, exhaust gas flows from the side closer to the cooling fan 6 towards 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 the exhaust pipe 53 connected to the exhaust gas outlet of the SCR case 45a.

[0043] Next, the support structure for supporting the ATD43 (i.e., the DPF case 44a and SCR case 45a) above the engine body 1 will be explained with reference to Figure 3, etc. Figure 3 is an exploded perspective view showing the configuration of the engine 100.

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

[0045] In the engine 100 of this embodiment, the support structure for supporting the ATD 43 above the engine body 1 consists 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] As shown in Figure 4, the support base 8 is made of a roughly plate-shaped casting. In the support base 8, the portion facing the lower part of the DPF case 44a and the lower part of the SCR case 45a is 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 a direction along the longitudinal direction of the engine 100, the support base 8 is made up of two arc-shaped plates arranged in the width direction.

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

[0048] As shown in Figure 4, the support base 8 is constructed by mounting a first support portion 70 and a second support portion 80 side by side in the longitudinal direction. The first support portion 70 is located at the front, and the second support portion 80 is located at the rear. However, it is not limited to this configuration, and the support base 8 may be formed as a single integrated unit.

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

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

[0051] Furthermore, the second support portion 80 has a rear end bracket mounting portion 84, an exhaust side bracket mounting portion 85, and an intake side bracket mounting portion 86. Support brackets 9 are attached to the rear end bracket mounting portion 84, the exhaust side bracket mounting portion 85, and the intake side bracket mounting portion 86, respectively.

[0052] The front mounting sections 81 of the case are formed in pairs in the width direction of the support base 8. The rear mounting section 82 of the case is similar. The DPF case 44a is attached to the front mounting section 81 and rear mounting section 82 on one side in the width direction. The SCR case 45a is attached to the front mounting section 81 and rear mounting section 82 on the other side in the width direction.

[0053] The configurations of the two front case mounting sections 81 are substantially identical to each other. Similarly, the configurations of the two rear case mounting sections 82 are substantially identical to each other. Below, we will describe, as a representative example, the front case mounting section 81 and the rear case mounting section 82 located on one side (specifically, the DPF case 44a side) in the width direction of the support base 8.

[0054] As shown in Figures 4 to 7, the front mounting portion 81 of the case has an auxiliary member mounting portion 81a and a case support portion 81b.

[0055] As shown in Figure 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). The first auxiliary member 87 is attached to this auxiliary member mounting portion 81a via bolts or the like.

[0056] The first auxiliary member 87 is formed in a block shape, as shown in Figures 5 and 6. As shown in Figure 6, the first auxiliary member 87 is attached to the auxiliary member mounting portion 81a via bolts or the like, which are inserted vertically, while resting on the upper surface of the auxiliary member mounting portion 81a. As a result, the first auxiliary member 87 is positioned 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 Figures 4 and 5, the front end of the DPF case 44a is attached to the first auxiliary member 87 via bolts or the like, which are inserted in the longitudinal direction of the engine 100, with the front end of the DPF case 44a abutting against the first auxiliary member 87. In this way, 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 projection 81c is formed on the upper surface of the case support portion 81b, which contacts the outer circumferential surface of the DPF case 44a and supports the DPF case 44a. This support projection 81c may be formed in multiple locations (two in this embodiment), as shown in the lower part of Figure 6, or it may consist of a single projection that is elongated and continuously formed in the width direction, as shown in the upper part of Figure 6.

[0059] Through this support projection 81c, the front end of the DPF case 44a is attached to the first auxiliary member 87 without contacting the upper surface of the case support portion 81b (and consequently the support base 8). In other words, as shown in Figure 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] As shown in Figure 6, the rear case mounting portion 82 is formed in the middle of the second support portion 80 in the longitudinal direction of the support base 8. The rear case mounting portion 82 comprises a first case mounting portion (fixing portion) 821 and a second case mounting portion (fixing portion) 822. The first case mounting portion 821 and the second case mounting portion 822 are arranged side by side in the longitudinal direction of the support base 8.

[0061] The first case mounting section 821 and the second case mounting section 822 have substantially the same configuration. Each of the first case mounting section 821 and the second case mounting section 822 consists of a pair of mounting bosses arranged at an appropriate interval in the width direction of the support base 8, for example. Mounting holes are formed in the vertical direction of each mounting boss. The spacing between the mounting holes can be determined, for example, by considering 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 that can fix the second auxiliary member 88 described later, or may be formed integrally with the second auxiliary member 88.

[0063] The first case mounting section 821 is located in front of the second case mounting section 822 (towards the cooling fan 6). The first case mounting section 821 is used when mounting a DPF case 44a that is relatively short in length.

[0064] The second case mounting portion 822 is located behind the first case mounting portion 821 (towards the flywheel housing 61). The second case mounting portion 822 is used when mounting a DPF case 44a that is relatively long.

[0065] The location for attaching the second auxiliary member 88 is either the first case mounting section 821 or the second case mounting section 822, which is selectively chosen. This allows the support base 8 to accommodate DPF cases 44a of different lengths according to their specifications. In other words, a common support base 8 can be used for DPF cases 44a of different specifications.

[0066] In the following explanation of the installation of the DPF case 44a, the case using the second case mounting portion 822 will be described as a representative example. Figure 7 shows how the second auxiliary member 88 is attached to the second case mounting portion 822.

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

[0068] Next, the configuration for attaching the DPF case 44a to the second case mounting section 822 will be briefly explained with reference to Figure 8, etc. Figure 8 is a perspective view showing the ATD 43 being attached to the support base 8.

[0069] As shown in Figure 8, a flange portion 46 is formed at the rear end of the DPF case 44a (the rear side of the SCR case 45a), extending radially outward from the outer circumferential surface. This flange portion 46 is used to attach to the second case mounting portion 822.

[0070] The flange portion 46 can be formed, for example, by attaching a substantially annular member formed from a plate member to the outer circumference of the DPF case 44a. However, it is not limited to this, and the flange portion 46 may be configured to extend further downward from the outer circumferential surface (i.e., a part of the outer circumferential surface) on the lower side of the DPF case 44a.

[0071] The second support portion 80 of the support base 8 has an opening 71 for the flange portion 46 to pass through. As shown in Figure 6, the opening 71 is located between a pair of mounting holes that make up the first case mounting portion 821 and the second case mounting portion 822, and is formed to penetrate the support base 8 in the thickness direction.

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

[0073] As shown in Figure 7, the second auxiliary member 88 is formed in an elongated block shape. The second auxiliary member 88 is fixed to the rear case mounting portion 82 (second case mounting portion 822) such that its longitudinal direction coincides with the width direction of the engine 100.

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

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

[0076] With the DPF case 44a resting on the support base 8, as shown in Figure 8, the flange portion 46 of the DPF case 44a is in contact with the rear surface (the portion where the mounting holes are formed) of the second auxiliary member 88. In this state, the flange portion 46 is attached to the second auxiliary member 88 via bolts or the like inserted in the longitudinal direction of the engine 100. In this way, 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 such that, when the flange portion 46 is attached to the second auxiliary member 88, the DPF case 44a forms a gap C2 between itself and the second support portion 80 as shown in Figure 5.

[0078] With this configuration, as shown in Figure 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 is in direct contact with the support base 8 (support projection 81c). In other words, the DPF case 44a is supported in a state where it is floating almost above the support base 8. As a result, air (wind) generated by the rotating cooling fan 6 can flow through the gaps C1 and C2 between the outer surface of the DPF case 44a and the upper surface of the support base 8. As a result, the heat dissipation effect of the ATD 43 is good.

[0079] Furthermore, as shown in Figure 6, the second support portion 80 of the support base 8 in this embodiment has multiple (eight in this embodiment) ventilation windows 72. These ventilation windows 72 are formed to penetrate the support base 8 in the thickness direction. This further enhances the heat dissipation effect of the ATD 43.

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

[0081] As shown in Figure 8 and other figures, the front bracket mounting portion 83 is formed at the front end of the support base 8 so as to protrude further downward from the lower surface of the support base 8. Multiple front bracket mounting portions 83 are formed at predetermined distances in the width direction of the support base 8 (two in this embodiment). The shape of the front bracket mounting portion 83 is not particularly limited; for example, it may be formed in a substantially cylindrical shape or a substantially funnel shape.

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

[0083] The front bracket mounting portion 83 is not limited to the above configuration, and may, for example, be composed of a through hole that penetrates the support base 8 in the vertical direction, or may be composed of a different mounting structure.

[0084] As shown in Figures 4 and 8, the rear end bracket mounting portion 84 is formed in a substantially cylindrical shape that protrudes further rearward from the rear end of the support base 8. Multiple rear end bracket mounting portions 84 are formed at predetermined distances from each other in the width direction of the support base (three in this embodiment).

[0085] The rear end bracket mounting portion 84 has mounting holes formed therein for inserting bolts or the like from the rear in the horizontal direction. As shown in Figure 10, these mounting holes are formed in accordance with the position of the horizontal holes in the horizontal mounting boss 92a formed on the rear support bracket 92, which will be described later.

[0086] The exhaust-side bracket mounting portion 85 is located at the end of the support base 8 on the side to which the DPF case 44a is attached, in the width direction of the support base 8. The exhaust-side bracket mounting portion 85 is formed in a substantially cylindrical shape that protrudes further downward from the lower surface of the support base 8. Multiple exhaust-side bracket mounting portions 85 are formed in the longitudinal direction of the support base 8 at predetermined distances from each other (two in this embodiment).

[0087] The exhaust-side bracket mounting portion 85 has mounting holes formed therein for inserting bolts or the like from above. As shown in Figure 10, these mounting holes are formed in a position corresponding to the mounting holes formed in the exhaust-side support bracket 93, which will be described later.

[0088] The intake-side bracket mounting portion 86 is located at the end of the support base 8 on the side to which 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 substantially cylindrical shape that protrudes further downward from the lower surface of the support base 8. Multiple intake-side bracket mounting portions 86 are formed in the longitudinal direction of the support base 8 at predetermined distances from each other (two in this embodiment).

[0089] Mounting holes are formed on the lower surface of the intake-side bracket mounting portion 86 for inserting bolts or the like from above. As shown in Figure 9, these mounting holes are formed in accordance with the positions of the mounting holes 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 asymmetrical positions in the width direction of the support base 8. That is, it is preferable that the exhaust-side bracket mounting portion 85 and the intake-side bracket mounting portion 86 are arranged 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 later, the support base 8 (and by extension the ATD43) can be supported in a balanced and stable manner, even if each of the exhaust-side support bracket 93 and the intake-side support bracket 94 is small.

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

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

[0095] The support bracket 9 comprises 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 support bracket 91, rear support bracket 92, exhaust-side support bracket 93, and 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 Figure 9. The front support bracket 91 is attached to the engine body 1 on the cooling fan 6 side and supports the support base 8.

[0097] The lower part of the front support bracket 91 has multiple mounting holes for inserting bolts in the longitudinal direction of the engine 100. As shown in Figure 9, the front support bracket 91 is fixed to the engine body 1 (for example, the cylinder head 13) by aligning the multiple mounting holes formed therein with holes formed at corresponding positions on the engine body 1 (for example, the cylinder head 13) and inserting bolts or the like in the longitudinal direction of the engine 100.

[0098] Multiple 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 position and number of front end bracket mounting portions 83. Each upper and lower mounting boss 91a has upper and lower holes into which bolts or the like can be inserted in the vertical direction. The upper surface of the upper and lower mounting bosses 91a contacts the lower surface of the front end bracket mounting portion 83 of the support base 8, thereby serving as a positioning surface 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 the upper and lower holes with the mounting holes formed in each of the aforementioned multiple front end bracket mounting portions 83, and then inserting bolts or the like in the vertical direction.

[0100] The rear support bracket 92 is formed in a block shape as shown in Figure 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] Multiple mounting holes are formed on the lower side of the rear support bracket 92 for inserting bolts or the like in the longitudinal direction of the engine 100. As shown in Figure 10, the rear support bracket 92 is fixed to the engine body 1 (for example, the cylinder head 13) by aligning the multiple mounting holes formed therein with holes formed at corresponding positions on the engine body 1 (for example, the cylinder head 13) and inserting bolts or the like in the longitudinal direction of the engine 100.

[0102] Multiple horizontal mounting bosses (horizontal mounting portions) 92a are formed on the upper end of the rear support bracket 92, corresponding to the position and number of rear end bracket mounting portions 84. Each horizontal mounting boss 92a has 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 contacts the rear surface of the rear end bracket mounting portion 84 of the support base 8, thereby serving as 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 aforementioned multiple rear case mounting portions 82, and then inserting bolts or the like horizontally.

[0104] As shown in Figure 10, the exhaust-side support bracket 93 is positioned on the exhaust side of the engine 100 in the width direction, where the exhaust manifold 42 is located. The exhaust-side support bracket 93 consists of two parts positioned at different heights.

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

[0106] As shown in Figure 10, the support base side block 96 is positioned above the engine body side block 97. The lower end of the support base side block 96 has a mounting hole for connecting it to the engine body side block 97. This mounting hole is designed so that bolts or the like are inserted in the width direction of the engine 100. The upper end of the support base side block 96 has a mounting hole for attaching it to the support base 8. This mounting hole is designed so that bolts or the like are inserted in the vertical direction.

[0107] As shown in Figure 10, the engine body side block 97 is positioned below the support base side block 96. The upper end of the engine body side block 97 has mounting holes for inserting bolts or the like in the width direction of the engine 100. These mounting holes are used to connect the engine body side block 97 to the support base side block 96. The lower end of the engine body side block 97 has mounting holes for inserting bolts or the like in the width direction of the engine 100. These mounting holes are 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 the mounting hole formed at its lower end with the mounting hole formed at the upper end of the engine body side block 97 and then attaching bolts or the like.

[0109] In this configuration, the exhaust-side support bracket 93 connects 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] As shown in Figure 10, the exhaust-side support bracket 93, configured as described above, is fixed to the engine body 1 by aligning the mounting holes formed on the lower side of the engine body block 97 with the corresponding holes formed on the engine body 1 and then attaching bolts or the like.

[0111] As shown in Figure 9, the intake-side support bracket 94 is positioned on the intake side of the engine 100 in the width direction, where the intake manifold 23 is located. The intake-side support bracket 94 consists of two parts positioned at different heights.

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

[0113] As shown in Figure 9, the upper block 98 is positioned above the lower block 99. The lower end of the upper block 98 has mounting holes for connecting it to the lower block 99. These mounting holes are designed to allow bolts or the like to be inserted in the width direction of the engine 100. The upper end of the upper block 98 has mounting holes for attaching it to the support base 8. These mounting holes are designed to allow bolts or the like to be inserted in the vertical direction.

[0114] As shown in Figure 9, the lower block 99 is positioned below the upper block 98. The upper end of the lower block 99 has mounting holes for inserting bolts or the like in the width direction of the engine 100. These mounting holes are used to connect the lower block 99 to the upper block 98. The lower end of the lower block 99 also has mounting holes for inserting bolts or the like in the width direction of the engine 100. These mounting holes are 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 aligning the mounting hole formed at its lower end with the mounting hole formed at the upper end of the lower block 99 and then attaching bolts or the like.

[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] As shown in Figure 9, the intake-side support bracket 94, configured as described above, is fixed to the engine body 1 by aligning the mounting holes formed on the lower side of the lower block 99 with the corresponding holes formed on the engine body 1 (for example, the cylinder block 12) and attaching bolts or the like.

[0118] As 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 Figure 3, the front support bracket 91 is attached to the front support bracket 91 by inserting bolts or the like vertically from below, thereby fixing the front end bracket mounting portion 83 of the support base 8 to the front support bracket 91.

[0120] In the rear support bracket 92, the intake-side support bracket 94 of the support base 8 is fixed to the rear support bracket 92 by inserting bolts or the like horizontally.

[0121] In the exhaust-side support bracket 93 and the intake-side support bracket 94, bolts or the like are inserted vertically from above to secure them, thereby fixing the exhaust-side bracket mounting portion 85 and the intake-side bracket mounting portion 86 of the support base 8 to the exhaust-side support bracket 93 and the intake-side support bracket 94, respectively.

[0122] In this way, the support base 8 is positioned above the engine body 1 and is supported by the engine body 1. The elongated ATD 43 is positioned along the longitudinal direction of the engine 100 and fixed to the support base 8. As a result, even if the length of the ATD 43 changes as described above depending on the specifications of the engine 100, the width of the engine 100 can be shortened. Therefore, the engine 100 of this embodiment achieves compactness in the width direction and is suitable for application to small tractors, for example, where it is necessary to house the engine inside a narrow bonnet.

[0123] In the engine 100 of this embodiment, when attaching the support base 8 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. After that, 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 allows for the vertical positioning of the support base 8, and the rear support bracket 92 allows for the longitudinal positioning of the support base 8 in the direction of the engine 100. Therefore, when mounting the support base 8 of the ATD 43 above the engine body 1, its three-dimensional mounting position can be easily and accurately determined. That is, the support base 8 can be easily mounted in the correct position without the need for a positioning jig or the like.

[0125] In this embodiment, the upper and lower mounting bosses 91a are located on the front support bracket 91, not 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 Figure 3, the cooling fan 6 is less likely to get in the way when inserting bolts to attach the support base 8 to the front support bracket 91. Thus, assembly workability is improved.

[0126] After the front support bracket 91 and the rear support bracket 92 are installed, the exhaust-side support bracket 93 and the intake-side support bracket 94 are installed. 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 with bolts. Therefore, the support base 8, which is precisely 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 causing any looseness or rattle.

[0127] Next, the sensor support structure of the engine 100 in this embodiment will be described. This support structure can suppress the effect of the heat from the ATD43 on the sensors.

[0128] This sensor support structure mainly consists of a sensor support bracket 60 equipped with a spacer 62.

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

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

[0131] In the longitudinal direction of the engine 100 (DPF device 44), the sensor support bracket 60 is provided with multiple spacers 62 (two in this embodiment) on the side facing the DPF case 44a, so that the sensor support bracket 60 is positioned at a predetermined distance from the DPF case 44a.

[0132] The spacers 62 are arranged in a line in the width direction of the engine 100 and are formed integrally with the sensor support bracket 60 by welding or the like. The spacers 62 are formed in a cylindrical shape, for example, and also function as mounting parts 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 via a spacer 62 and bolts or the like. 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 to a frame 50, which is provided separately from the ATD 43, via bolts or the like. This allows the sensor support bracket 60 to be mounted in a stable position.

[0134] The stiffener 47 is formed by extending 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 formed from a plate member to the outer circumferential surface of the DPF case 44a.

[0135] As a result, the sensor support bracket 60 can be mounted at a position away from the outer surface of the DPF case 44a, thereby suppressing the effects of radiant heat from the DPF case 44a.

[0136] Furthermore, as described above, since the sensor support bracket 60 is attached to the stiffener 47 via the spacer 62, the area in which the sensor support bracket 60 directly connects to 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] In other words, the above-described heat-insulating support structure prevents thermal damage to sensors such as the differential pressure sensor 48 from heat radiating from the DPF case 44a. Sensors can also be placed near the ATD 43, allowing for more compact wiring and greater flexibility in sensor layout.

[0138] As described above, the engine 100 of this embodiment has an ATD 43 for purifying exhaust gas. The engine 100 comprises an engine body 1, a support base 8, a front support bracket 91, and a rear support bracket 92. The support base 8 supports the ATD 43. The front support bracket 91 is located on one side of the engine body 1 and attached to the engine body 1, supporting the support base 8. The rear support bracket 92 is located on the opposite side of the engine body 1 from the front support bracket 91 and attached to the engine body 1, supporting the support base 8. The front support bracket 91 is located on one side of the engine body 1 and has upper and lower mounting bosses 91a that are mounted vertically to the support base 8. The rear support bracket 92 is located on the opposite side of the engine body 1 from the front support bracket 91 and has horizontal mounting bosses 92a that are mounted horizontally to the support base 8.

[0139] This allows the ATD43 to be easily supported above the engine body 1. Furthermore, 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 on the front support bracket 91 and the rear support bracket 92, the position of the support base 8 (and thus the ATD43) can be accurately determined without the need for a positioning jig. Therefore, assembly workability is good.

[0140] Furthermore, 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 positioned on opposite sides of the engine body 1. The front support bracket 91 is positioned on the cooling fan 6 side. The rear support bracket 92 is positioned on the flywheel side.

[0141] As a result, the support base 8 is mounted vertically to the front support bracket 91, so the cooling fan 6 is less likely to get in the way when inserting bolts to install it. Therefore, the support base 8 can be easily fixed to the front support bracket 91 which is fixed to the engine body 1.

[0142] Furthermore, 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 positioned on the side of the engine body 1 that is different from both the side where the front support bracket 91 is located and the side where the rear support bracket 92 is located (the exhaust side). The intake-side support bracket 94 is positioned on the opposite side of the engine body 1 from the exhaust-side support bracket 93 (the intake side). The exhaust-side support bracket 93 is composed of a support base-side block 96 and an engine body-side block 97 arranged in the 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 the direction connecting the engine body 1 and the support base 8.

[0143] This allows the support base 8 to be supported on all four sides, thus achieving even more stable support. Furthermore, by configuring the exhaust-side support bracket 93 and the intake-side support bracket 94 to allow for positional changes between components, the support base 8 can be properly supported while maintaining its positioning with the front support bracket 91 and the rear support bracket 92.

[0144] Furthermore, 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 mounting portion 821 and a second case mounting portion 822 to which the second auxiliary member 88 can be fixed.

[0145] This allows the mounting position of the ATD43 on the support base 8 to be changed in stages, so that a common support base 8 can be used for multiple specifications of the ATD43. As a result, manufacturing costs can be reduced, and the effort required for parts management can be reduced.

[0146] Next, a modified support base 8x will be described with reference to Figures 12 and 13. Figure 12 is a perspective view showing the configuration of the modified support base 8x. Figure 13 is a perspective view showing the ATD43 attached to the modified support base 8x. In this description of the modified example, the same or similar components as those in the previously described embodiment will be denoted by the same reference numerals in the drawings, and their descriptions may be omitted.

[0147] As shown in Figure 12, the modified support base 8x consists of a main body 73, a front auxiliary member 74, a rear projection 75, and a side mounting portion 76.

[0148] The main body 73 is made of a roughly plate-shaped casting and is formed in a rectangular (square) shape when viewed from above. Multiple 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 (towards the cooling fan 6 of the engine 100) via bolts or the like.

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

[0150] The front auxiliary member 74 has the case support portion 81b of the above embodiment formed thereon. 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), supporting the DPF case 44a (SCR case 45a) so that it does not come into contact with 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 projection 75 is formed on the rear side of the main body 73 (towards the flywheel housing 61 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 projection 75 contacts the outer circumferential surface of the rear end of the DPF case 44a (SCR case 45a), supporting the DPF case 44a (SCR case 45a) so that it does not come into contact with 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, even with the support base 8x, the DPF case 44a (SCR case 45a) can be supported in a state where it is almost 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, no bands or other components are required to wrap around the outer circumference of the case. Therefore, there is no need to provide a structure in the DPF case 44a (SCR case 45a) to increase its rigidity to withstand the tightening of the bands, thus reducing costs.

[0154] In the longitudinal direction of the engine 100, mounting holes for fixing the DPF case 44a (SCR case 45a) are formed on the side surface of the rear projection 75 on the flywheel housing 61 side (i.e., the rear surface of the support base 8x).

[0155] With the DPF case 44a (SCR case 45a) placed on the support base 8x, as shown in Figure 13, the flange portion 46 of the DPF case 44a (SCR case 45a) contacts the rear surface of the support base 8x (the portion where the mounting holes are formed). 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 SCR case 45a) is 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 roughly 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 located on both sides of the support base 8x in the width direction of the engine 100.

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

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

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

[0160] A horizontal mounting boss may be formed on the front support bracket 91, and vertical mounting bosses may be formed on the rear support bracket 92.

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

[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 SCR case 45a on the flywheel housing 61 side may be directly attached to the case rear mounting portion 82. The case rear mounting portion 82 may be changed to another shape, such as a plate-shaped member whose fixing position in the longitudinal direction of the support base 8 can be changed.

[0164] The rear mounting portion 82 of the case may include three or more case mounting 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 changed as appropriate.

[0166] The ATD43 may consist only of the DPF device 44.

[0167] When viewed in plan, the longitudinal direction of the roughly rectangular engine 100 may be perpendicular to the direction in which the crankshaft 10 extends. Alternatively, when viewed in plan, the engine 100 may be roughly square. [Explanation of Symbols]

[0168] 1. Engine body 8 Support stand 43 ATD (Automatic Transmission Device) 91 Front support bracket 91a Upper and lower 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 gases, The engine body and The exhaust gas purification device comprises a support base for supporting the exhaust gas purification device, The support base has a curved portion, A bracket is provided below the support base. The bracket is positioned on opposite sides of the engine body in the longitudinal direction of the exhaust gas purification device and the longitudinal direction of the engine, and is attached to the engine body.

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

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

4. The engine according to claim 3, wherein one of the plurality of brackets is mounted vertically to the support base.

5. The engine according to claim 4, wherein one of the brackets is further mounted horizontally to the engine body.

6. The engine according to claim 5, wherein in one of the brackets, the mounting position to the engine body is closer to the engine body than the mounting position to the support base.

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