Engine

Abstract

Provided is a technique for reducing the weight of a component for supporting an exhaust gas purification device of an engine and suppressing a reduction in supporting strength. An exemplary engine is provided with: an engine main body; the waste gas purification device is provided with a first shell and a second shell; and a bracket for attaching the exhaust gas purification device to the engine main body. The bracket has: a first housing attachment part attached to the first housing; a second housing attachment part attached to the second housing; and a connecting part for connecting the first housing mounting part and the second housing mounting part.

Description

Technical Field

[0001] The present invention relates to engines. Background Art

[0002] In the past, an engine in which an exhaust gas purification device is arranged above the engine body is known (for example, see Patent Document 1). The engine device disclosed in Patent Document 1 includes: a plurality of leg bodies vertically arranged on the cylinder head; and a rectangular support platform mounted on the upper ends of the plurality of leg bodies. The exhaust gas purification device is supported in a state arranged on the rectangular support platform.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-83803

[0004] If a large support platform is arranged above the engine body to support the exhaust gas purification device, there is a concern that the weight of the engine will increase. On the other hand, if the support platform is eliminated for weight reduction, there is a concern that the supporting strength of the exhaust gas purification device will decrease. Summary of the invention

[0005] In view of the above circumstances, an object of the present invention is to provide a technology capable of achieving weight reduction of a member supporting an exhaust gas purification device of an engine and suppressing a decrease in supporting strength.

[0006] An exemplary engine of the present invention comprises: an engine body; an exhaust gas purification device having a first housing and a second housing; and a bracket for mounting the exhaust gas purification device on the engine body. The bracket comprises: a first housing mounting portion mounted on the first housing; a second housing mounting portion mounted on the second housing; and a connecting portion connecting the first housing mounting portion and the second housing mounting portion.

[0007] According to the exemplary present invention, with respect to an engine, it is possible to achieve a reduction in weight of a member that supports an exhaust gas purification device and suppress a decrease in support strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a perspective view showing a schematic structure of an engine.

[0009] Figure 2 It is a perspective view showing a schematic structure of an engine.

[0010] Figure 3 It is a perspective view showing a schematic structure of a support structure of the exhaust gas purification device.

[0011] Figure 4 It is a perspective view showing a schematic structure of a support structure of the exhaust gas purification device.

[0012] Figure 5 It is a decomposition representation Figure 4Schematic perspective view of a portion of the support structure of the exhaust gas purification device shown.

[0013] Figure 6 This is a schematic exploded perspective view showing the relationship between the housing mounting portion belonging to the front side mounting portion and the housing.

[0014] Figure 7 It is a schematic side view showing an enlarged view of the periphery of an inlet pipe included in the exhaust gas purification device.

[0015] Figure 8 It is a schematic perspective view showing the relationship between the housing mounting portion belonging to the rear side mounting portion and the housing.

[0016] Fig. 9 It is a schematic exploded perspective view showing the relationship between the housing mounting portion belonging to the rear side mounting portion and the housing.

[0017] Fig.10 It is a schematic perspective view showing the relationship between the connecting portion, the rear first housing mounting portion, and the rear second housing mounting portion.

[0018] Fig.11 It is a schematic perspective view showing the relationship between the connecting portion, the rear first housing mounting portion, and the rear second housing mounting portion.

[0019] Fig.12 It is a schematic exploded perspective view showing the relationship between the connecting portion and the rear first housing mounting portion.

[0020] Fig.13 It is a schematic exploded perspective view showing the relationship between the connecting portion and the rear second housing mounting portion.

[0021] Description of Reference Numerals

[0022] 1...engine body; 2...exhaust purification device; 3...cooling fan; 4...flywheel; 5...bracket; 6...electronic components; 25...suspension part; 52...first housing mounting part; 53...second housing mounting part; 54...connecting part; 211...DPF housing (first housing); 221...SCR housing (second housing); 511...front body mounting part; 511c...air vent; 512...rear body mounting part; 512c...ventilation part; 521...front first housing mounting part; 522...rear first housing mounting part; 531...front second housing mounting part; 532...rear second housing mounting part; 541...setting part; 542...bending part; 5421...first bending part; 5422...second bending part. DETAILED DESCRIPTION

[0023] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the drawings, the same or corresponding parts are denoted by the same reference numerals, and their description will not be repeated unless otherwise required.

[0024] <1. Engine Overview>

[0025] Figure 1 and Figure 2 1 is a perspective view showing a schematic structure of an engine 100 according to an embodiment of the present invention. Figure 1 and Figure 2 In the embodiment, the direction of viewing the engine 100 is different. The engine 100 of this embodiment is a diesel engine, for example, mounted on agricultural machinery such as a tractor or an engineering machinery such as a slide loader. The engine 100 is configured as an inline four-cylinder engine with four cylinders arranged in line. In addition, the number of cylinders of the engine is not limited to four, and may be other numbers.

[0026] Here, directions in this specification are defined as follows. Figure 1 and Figure 2 A dashed line AX in FIG. 1 represents an axis line of a crankshaft (not shown) included in the engine 100 , and a direction in which the axis line AX extends (crankshaft direction) is defined as a front-rear direction. Figure 1 This is a picture viewed from the front. Figure 2 This is a diagram viewed from the rear obliquely. In addition, the lateral direction perpendicular to the front-rear direction is referred to as the left-right direction. The side that becomes the left when facing from the rear to the front is referred to as "left", and the side that becomes the right is referred to as "right". In addition, the gravity direction perpendicular to the front-rear direction and the left-right direction is referred to as the up-down direction, and the upstream side of the gravity direction is referred to as "up", and the downstream side is referred to as "down". In addition, the above directions are only names for explanation, and are not intended to limit the actual positional relationship and direction.

[0027] like Figure 1 and Figure 2 As shown, the engine 100 includes an engine body 1 and an exhaust gas purification device 2 .

[0028] [1-1. Engine body]

[0029] The engine body 1 includes an oil pan 11 , a cylinder block 12 , a cylinder head 13 , and a cylinder head cover 14 .

[0030] The oil pan 11 is provided at the lower end of the engine 100. The oil pan 11 is formed in a container shape with an open upper side. The oil pan 11 stores engine oil for lubricating the engine 100.

[0031] The cylinder body 12 is mounted on the upper side of the oil pan 11. A recessed portion for accommodating a crankshaft (not shown) extending in the front-rear direction is formed in the lower portion of the cylinder body 12. A plurality of cylinders (not shown) arranged at intervals in the front-rear direction are formed in the upper portion of the cylinder body 12. Each cylinder extends in the up-down direction. In addition, in the present embodiment, the engine 100 is an inline four-cylinder engine with four cylinders. A piston (not shown) connected to the crankshaft via a connecting rod is accommodated in each cylinder. The piston is movable in the up-down direction inside the cylinder. The crankshaft rotates around the axis AX as the center due to the reciprocating motion of the piston in each cylinder.

[0032] The cylinder head 13 is mounted on the upper side of the cylinder block 12. The cylinder head 13 and the cylinder block 12 form a combustion chamber corresponding to each cylinder. An intake manifold 15 is arranged on the right side surface of the cylinder head 13. An exhaust manifold 16 is arranged on the left side surface of the cylinder head 13. Hereinafter, the side (right side) of the engine body 1 to which the intake manifold 15 is mounted is sometimes referred to as the intake side. In addition, the side (left side) of the engine body 1 to which the exhaust manifold 16 is mounted is sometimes referred to as the exhaust side.

[0033] The intake manifold 15 distributes the air supplied via the intake pipe 17 to each cylinder and supplies it to the combustion chamber formed in each cylinder. In each combustion chamber, the air supplied from the intake manifold 15 is compressed, and then the fuel supplied from the fuel supply unit (not shown) is injected. As a result, combustion occurs in the combustion chamber, and the piston can be reciprocated up and down. The power obtained in this way is transmitted to various devices on the downstream side of the power via the crankshaft and the like.

[0034] In addition, in the present embodiment, a supercharger 18 is provided on the left side surface of the engine 100. That is, the supercharger 18 is provided on the exhaust side of the engine 100. The supercharger 18 has a turbine and a compressor (both not shown) housed therein. The turbine rotates by the energy of the exhaust gas flowing from the exhaust manifold 16, and the compressor rotates together with the turbine. By the rotation of the compressor, the air purified by the air filter (not shown) is compressed and sent to each cylinder via the unshown piping and the intake manifold 15.

[0035] The exhaust manifold 16 collects exhaust gas generated in each combustion chamber. The exhaust gas in the exhaust manifold 16 flows to the supercharger 18 via a pipe (not shown), drives a turbine of the supercharger 18, and then flows to the exhaust gas purification device 2 (ATD: After Treatment Device) via a connecting pipe 19.

[0036] The cylinder head cover 14 is disposed on the upper side of the cylinder head 13. The cylinder head cover 14 accommodates a valve mechanism (not shown) composed of a push rod and a rocker arm for operating an intake valve and an exhaust valve (neither shown).

[0037] In addition, a cooling fan 3 is rotatably mounted on the front side of the engine body 1. That is, the engine 100 includes a cooling fan 3 disposed in front of the engine body 1. The cooling fan 3 is rotated by the power transmitted from the crankshaft. The cooling fan 3 generates a flow of air by rotating, and the air is passed through a radiator (not shown) for cooling the cooling water of the engine 100, and blown toward the engine body 1. As a result, the engine body 1 is cooled.

[0038] In addition, a flywheel 4 is arranged at the rear side of the engine body 1. That is, the engine 100 includes a flywheel 4 arranged at the rear of the engine body 1. The flywheel 4 is attached to the rear end of the crankshaft. The flywheel 4 rotates integrally with the crankshaft and is used to extract the power of the engine 100.

[0039] [1-2. Exhaust gas purification device]

[0040] The exhaust gas purification device 2 is a device that performs post-treatment of the exhaust gas. The exhaust gas purification device 2 purifies the exhaust gas by removing harmful components such as NOx (nitrogen oxides), CO (carbon monoxide), HC (hydrocarbons), and particulate matter contained in the exhaust gas.

[0041] like Figure 1 and Figure 2 As shown, the exhaust gas purification device 2 includes a DPF (Diesel Particulate Filter) device 21 and an SCR (Selective Catalytic Reduction) device 22 .

[0042] The DPF device 21 uses an oxidation catalyst and a filter contained in the DPF housing 211 to remove carbon monoxide, nitrogen monoxide, and particulate matter contained in the exhaust gas. The oxidation catalyst is composed of platinum and the like, and oxidizes (burns) unburned fuel, carbon monoxide, and nitrogen monoxide contained in the exhaust gas. The filter is arranged at a position downstream of the exhaust gas than the oxidation catalyst, for example, as a fall-flow type filter. The filter captures particulate matter contained in the exhaust gas treated by the oxidation catalyst.

[0043] The SCR device 22 removes NOx contained in the exhaust gas via the SCR catalyst and the slip catalyst contained in the SCR housing 221. The SCR catalyst is made of raw materials such as ceramics that adsorb ammonia. NOx contained in the exhaust gas is reduced by contact with the SCR catalyst that adsorbs ammonia 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 ammonia and changes it into nitrogen and water.

[0044] The DPF housing 211 and the SCR housing 221 are both composed of a roughly cylindrical hollow component extending in the front-to-back direction. The DPF housing 211 and the SCR housing 221 are arranged in the left-to-right direction and are arranged above the engine body 1. In detail, the DPF housing 211 is arranged on the left side of the engine 100, that is, the exhaust side. The SCR housing 221 is arranged on the right side of the engine 100, that is, the intake side. In addition, the DPF housing 211 is an example of the first housing of the present invention, and the SCR housing 221 is an example of the second housing of the present invention. That is, the exhaust gas purification device 2 has a first housing 211 and a second housing 221. Above the engine body 1, the length directions of the first housing 211 and the second housing 221 extend in the front-to-back direction, and the first housing 211 and the second housing 221 are arranged side by side in the left-to-right direction.

[0045] When viewed from above, an inter-casing pipe 23 extending in the front-to-back direction is arranged between the left-right direction of the DPF casing 211 and the SCR casing 221. Specifically, the inter-casing pipe 23 is arranged above the DPF casing 211 and the SCR casing 221. The rear end of the DPF casing 211 is connected to the rear end of the inter-casing pipe 23. The front of the SCR casing 221 is connected to the front end of the inter-casing pipe 23.

[0046] An inlet pipe 212 protruding downward is provided at the front end of the DPF housing 211 (see Figure 1 The inlet pipe 212 is connected to the connection pipe 19 . The exhaust gas that drives the turbine of the supercharger 18 is guided into the DPF case 211 via the connection pipe 19 and the inlet pipe 212 .

[0047] Inside the DPF housing 211, the exhaust gas flows from the front end to the rear end, and is processed by the DPF device 21. The exhaust gas that has passed through the DPF housing 211 flows to the inter-housing piping 23. In the inter-housing piping 23, the exhaust gas flows from the rear end to the front end. In addition, the exhaust gas is mixed with urea supplied from the urea supply device 24 disposed on the rear end side of the inter-housing piping 23 in the inter-housing piping 23. The exhaust gas that has passed through the inter-housing piping 23 flows to the SCR housing 221. Inside the SCR housing 221, the exhaust gas flows from the front end to the rear end, and is processed by the SCR device 22. The exhaust gas that has passed through the SCR housing 221 is discharged to the outside via the outlet piping 222 disposed at the rear end of the SCR housing 221.

[0048] <2. Support structure of exhaust gas purification device>

[0049] Next, a support structure for supporting the exhaust gas purification device 2 on the engine body 1 will be described.

[0050] [2-1. Overview of support structure]

[0051] Figure 3 and Figure 4 2 is a perspective view showing a schematic structure of a support structure of the exhaust gas purification device 2. Figure 3 and Figure 4 In FIG. 2 , the direction in which the supporting structure of the exhaust gas purification device 2 is viewed is different. Figure 3 This is a view viewed from the oblique front (the cooling fan 3 side). Figure 4 This is a view viewed from the oblique rear (flywheel 4 side). Figure 3 and Figure 4 The diagram shows the cylinder head 13 , the head cover 14 , and the exhaust gas purification device 2 which constitute the engine 100 extracted from the diagram.

[0052] like Figure 3 and Figure 4 As shown, the engine 100 includes a bracket 5 for mounting the exhaust gas purifying device 2 on the engine body 1. Preferably, the bracket 5 mounts the exhaust gas purifying device 2 on the cylinder head 13. The bracket 5 is composed of a plurality of parts (components). The plurality of parts constituting the bracket 5 are made of metal, for example.

[0053] The bracket 5 includes: a front side mounting portion 5F, which is mounted on the front side of the engine 100; and a rear side mounting portion 5R, which is mounted on the rear side of the engine 100. By dividing the bracket 5 into the front side and the rear side of the engine 100, a structure is formed in which no large support platform is arranged between the engine body 1 and the exhaust gas purification device 2 in the vertical direction. That is, according to the structure of the present embodiment, the support structure of the exhaust gas purification device 2 can be made lightweight. In addition, in the present example, the bracket 5 also includes a side surface mounting portion 5S mounted on the side surface (more specifically, the left side surface) of the engine 100. The side surface mounting portion 5S is not a necessary structure, but the provision of the side surface mounting portion 5S can improve the support strength of the exhaust gas purification device 2.

[0054] In addition, the bracket 5 includes: a main body mounting portion 51 mounted on the engine main body 1; a first housing mounting portion 52 mounted on the DPF housing (first housing) 211; and a second housing mounting portion 53 mounted on the SCR housing (second housing) 221. In addition, in the present embodiment, the main body mounting portion 51 is mounted on the cylinder head 13. Both the first housing mounting portion 52 and the second housing mounting portion 53 are mounted on the exhaust gas purification device 2 in a broad sense.

[0055] Figure 5 It is a decomposition representation Figure 4 FIG. 2 is a schematic perspective view of a portion of the support structure of the exhaust gas purification device 2 shown in FIG. Figure 5As shown in FIG. 1 , the exhaust gas purification device 2 having the DPF housing 211 and the SCR housing 221 is in a unitized state. The unitized exhaust gas purification device 2 includes a first housing mounting portion 52 and a second housing mounting portion 53. In addition, when the exhaust gas purification device 2 is assembled to the engine 100, as shown in FIG. Figure 5 As shown, the main body mounting portion 51 is in a state of being pre-mounted on the cylinder head 13 .

[0056] When the exhaust gas purification device 2 is assembled to the engine 100, the exhaust gas purification device 2 is suspended by a suspension device (not shown) and lowered from above toward the engine body 1 (cylinder head 13) to which the main body mounting portion 51 is mounted. Then, the first housing mounting portion 52 and the second housing mounting portion 53 are appropriately aligned with the main body mounting portion 51 and fastened by tightening the bolts. Thus, the exhaust gas purification device 2 is mounted on the upper side of the engine body 1.

[0057] Furthermore, the exhaust gas purification device 2 is provided with a suspension portion 25 that allows suspension by a suspension device. Figure 5 As shown in the figures, the suspension part 25 is provided on the DPF case 211 and the SCR case 221. That is, the first case 211 and the second case 221 have the suspension part 25 which allows the exhaust gas purification device 2 to be suspended.

[0058] In detail, the first suspension part 251 is provided at the front end of the DPF housing 211 and the SCR housing 221. The first suspension part 251 is composed of a metal sheet extending in the left-right direction in the length direction. The left end of the first suspension part 251 is mounted on the front end face of the DPF housing 211. The right end of the first suspension part 251 is mounted on the front end face of the SCR housing 221. That is, the first suspension part 251 connects the DPF housing 211 and the SCR housing 221. The first suspension part 251 has a through hole 251a penetrating in the front-to-back direction at the left end (DPF housing 211 side). In addition, the second suspension part 252 is provided at the rear end of the SCR housing 221. The second suspension part 252 is composed of a metal sheet extending in the up-down direction in the length direction, and has a through hole 252a penetrating in the front-to-back direction. The lower side of the second suspension part 252 is fixed to the rear end face of the SCR housing 221. Linear members such as wires are passed through the through holes 251 a of the first suspension part 251 and the through holes 252 a of the second suspension part 252 , respectively, to suspend the exhaust gas purifying device 2 .

[0059] [2-2. Main body installation part]

[0060] In detail, the main body mounting portion 51 of the bracket 5 includes a front main body mounting portion 511 and a rear main body mounting portion 512. That is, the bracket 5 has a front main body mounting portion 511 and a rear main body mounting portion 512. In addition, in the present embodiment, the main body mounting portion 51 also includes the above-mentioned side surface mounting portion 5S. The side surface mounting portion 5S is fastened to the left side surface (exhaust side) of the cylinder head 13 using bolts.

[0061] like Figure 3 As shown in the figures, the front side main body mounting part 511 is mounted on the front side of the engine body 1. That is, the front side main body mounting part 511 is included in the above-mentioned front side mounting part 5F. The front side main body mounting part 511 has a door-shaped structure formed by connecting the upper parts of the left and right pair of legs 511a with the leg connecting parts 511b extending left and right. The front side main body mounting part 511 is mounted on the cylinder head 13 by fastening each of the left and right pair of legs 511a to the front end surface of the cylinder head 13 with bolts.

[0062] The front side main body mounting portion 511 has a vent hole 511c that penetrates in the front-to-back direction. By providing the vent hole 511c, the wind generated by the rotation of the cooling fan 3 can be passed toward the engine body 1 at the position where the front side main body mounting portion 511 is provided. By this wind, for example, a wire harness (not shown) arranged between the exhaust gas purification device 2 and the cylinder head cover 14 in the vertical direction can be cooled.

[0063] In detail, a plurality of vent holes 511c are provided. One vent hole 511c is provided in each of the left and right pair of legs 511a. However, the number and arrangement of the vent holes 511c may be other than the structure of the present embodiment. The vent hole 511c may be singular. In addition, depending on the circumstances, the vent hole 511c may not be provided. In addition, the wind generated by the rotation of the cooling fan 3 also passes between the left and right pair of legs 511a in the left and right directions.

[0064] like Figure 4 As shown in the figures, the rear side main body mounting part 512 is mounted on the rear side of the engine main body 1. That is, the rear side main body mounting part 512 is included in the above-mentioned rear side mounting part 5R. The rear side main body mounting part 512 has a door-shaped structure formed by connecting the upper parts of the left and right pair of legs 512a with the leg connecting parts 512b extending left and right. The rear side main body mounting part 512 is mounted on the cylinder head 13 by fastening the left and right pair of legs 512a to the rear end surface of the cylinder head 13 with bolts.

[0065] The rear main body mounting portion 512 has a ventilation portion 512c that allows wind to flow in the front-to-back direction. By providing the ventilation portion 512c, the wind that has passed through the vent hole 511c of the front main body mounting portion 511 can flow to the rear. In detail, the ventilation portion 512c is a space formed between the left and right pair of leg portions 512a in the left-right direction. However, the ventilation portion 512c can also be a through hole that is provided in the rear main body mounting portion 512 and penetrates in the front-to-back direction.

[0066] [2-3. Housing mounting section]

[0067] The housing mounting portion includes a first housing mounting portion 52 and a second housing mounting portion 53. The housing mounting portion includes a housing mounting portion belonging to the front mounting portion 5F and a housing mounting portion belonging to the rear mounting portion 5R. Hereinafter, the housing mounting portion will be described in the order of the housing mounting portion belonging to the front mounting portion 5F and the housing mounting portion belonging to the rear mounting portion 5R.

[0068] In addition, the first shell mounting portion 52 has a front first shell mounting portion 521 and a rear first shell mounting portion 522. The front first shell mounting portion 521 is a shell mounting portion belonging to the front mounting portion 5F. The rear first shell mounting portion 522 is a shell mounting portion belonging to the rear mounting portion 5R. In addition, the second shell mounting portion 53 has a front second shell mounting portion 531 and a rear second shell mounting portion 532. The front second shell mounting portion 531 is a shell mounting portion belonging to the front mounting portion 5F. The rear second shell mounting portion 532 is a shell mounting portion belonging to the rear mounting portion 5R.

[0069] (2-3-1. Housing mounting portion belonging to the front mounting portion)

[0070] Figure 6 It is a schematic exploded perspective view showing the relationship between the case mounting portions 521 and 531 belonging to the front-side mounting portion 5F and the cases 211 and 221 .

[0071] like Figure 3 , Figure 6 As shown in the figures, the front first shell mounting portion 521 is mounted on the lower portion of the front end surface of the DPF shell 211. The front first shell mounting portion 521 has: a rectangular plate-shaped base portion 521a, which extends in the horizontal direction; and a rectangular plate-shaped upright portion 521b, which is vertically arranged at the rear end of the base portion 521a. In addition, the horizontal direction is a direction orthogonal to the up-down direction. In addition, the upright portion 521b extends in a direction orthogonal to the front-to-back direction. A pair of through holes (not shown) are provided in the upright portion 521b, which are arranged at intervals in the left-right direction and pass through in the front-to-back direction. In addition, in Figure 3 , Figure 6 In the embodiment, a nut NU is arranged in front of each of the pair of through holes, and the pair of through holes are hidden by the nut NU.

[0072] like Figure 6 As shown, a stud bolt SB protruding forward is provided on the front end surface of the DPF housing 211. Corresponding to the pair of through holes provided on the upright portion 521b of the front first housing mounting portion 521, a pair of stud bolts SB arranged at intervals on the left and right are provided on the front end surface of the DPF housing 211. When the stud bolt SB passes through the through holes provided on the upright portion 521b, the nut NU is fitted into the stud bolt SB and tightened, so that the front first housing mounting portion 521 is fixed to the DPF housing 211. In addition, in the present embodiment, the front first housing mounting portion 521 is configured to be fixed at two locations relative to the DPF housing 211, but the position and number of the fixing locations can be appropriately changed.

[0073] like Figure 3 , Figure 6 As shown in the figure, the front second housing mounting portion 531 is mounted on the lower part of the front end surface of the SCR housing 221. The shape of the front second housing mounting portion 531 is the same as that of the front first housing mounting portion 521, and includes: a base portion 531a; and a vertical portion 531b, which has a pair of through holes. The front second housing mounting portion 531 is fixed to the SCR housing 221 by stud bolts SB and nuts NU, similarly to the front first housing mounting portion 521.

[0074] Each of the base portion 521a of the front first housing mounting portion 521 and the base portion 531a of the front second housing mounting portion 531 is provided with a through hole (not shown) penetrating in the up-down direction at the left and right ends. Furthermore, a threaded hole SH1 is provided on the upper surface of the front main body mounting portion 511 in a manner corresponding to the through holes (see Figure 5 ). The front first housing mounting portion 521 and the front second housing mounting portion 531 are fixed to the front main body mounting portion 511 by inserting the bolts BO passing through the through holes into the threaded holes SH1. That is, the front first housing mounting portion 521 is mounted to the front main body mounting portion 511. The front second housing mounting portion 531 is mounted to the front main body mounting portion 511.

[0075] Figure 7 1 is a schematic side view showing an enlarged view of the periphery of the inlet pipe 212 of the exhaust gas purification device 2. The inlet pipe 212 is an exhaust gas inlet of the exhaust gas purification device 2 and is arranged at the front part of the exhaust side of the engine 100. That is, in the engine 100, the exhaust gas inlet of the exhaust gas purification device 2 is arranged at one side of the front-rear direction of the engine 100.

[0076] like Figure 7As shown, the bracket 5 is configured such that, on one side in the front-rear direction (the front side in this embodiment), a mounting portion PL1 mounted on the exhaust gas purifying device 2 is offset toward the exhaust gas inlet side compared to a mounting portion PL2 mounted on the engine body 1 .

[0077] In detail, the mounting position PL1 of the bracket 5 mounted on the exhaust gas purification device 2 is a position where the rear end face of the front side first housing mounting portion 521 contacts the front end face of the DPF housing 211. In addition, the position of the position where the rear end face of the front side first housing mounting portion 521 contacts the front end face of the DPF housing 211 and the position where the rear end face of the front side second housing mounting portion 531 contacts the front end face of the SCR housing 221 are the same in the front-to-back direction. In addition, the mounting position PL2 of the bracket 5 mounted on the engine body 1 is a position where the rear end face of the front side body mounting portion 511 contacts the front end face of the cylinder head 13.

[0078] The mounting position PL1 mounted on the exhaust gas purification device 2 is offset to the front side compared with the mounting position PL2 mounted on the engine body 1. More specifically, the mounting position PL1 mounted on the exhaust gas purification device 2 is located further forward than the inlet piping 212, and the inlet piping 212 is located further forward than the mounting position PL2 mounted on the engine body 1.

[0079] Such a structure is realized by the front wall of the front body mounting portion 511 mounted on the cylinder head 13 and the front first housing mounting portion 521 having an inclined portion 511d that becomes forward from the bottom to the top. With such a structure, a wide space SP can be ensured around (particularly below) the inlet pipe 212. As a result, the workability of the installation work of the connecting pipe 19 to the inlet pipe 212 and the maintenance work around the inlet pipe 212 can be improved.

[0080] (2-3-2. Housing mounting portion belonging to the rear mounting portion)

[0081] Figure 8 2 is a schematic perspective view showing the relationship between the housing mounting parts 522, 532 belonging to the rear mounting part 5R and the housings 211, 221. Figure 8 As shown, the rear mounting portion 5R includes a connecting portion 54 in addition to the rear first housing mounting portion 522 and the rear second housing mounting portion 532. That is, the bracket 5 has the connecting portion 54. The details of the connecting portion 54 will be described later. Fig. 9 2 is a schematic exploded perspective view showing the relationship between the housing mounting parts 522, 532 belonging to the rear mounting part 5R and the housings 211, 221. Fig. 9 In the figure, the connecting portion 54 is omitted.

[0082] like Figure 4 , Figure 8 as well as Fig. 9 As shown in FIGS. 1 and 1 , the rear first housing mounting portion 522 is mounted on the lower portion of the rear end side of the DPF housing 211 .

[0083] The rear first shell mounting portion 522 is formed in a plate shape. When viewed from above, the rear first shell mounting portion 522 is a roughly trapezoidal shape with the front side as the long side and the rear side as the short side. The rear first shell mounting portion 522 has a pair of cylinders 522a extending in the front-to-back direction at the left and right ends of the front end side. An internal thread is formed on the inner surface of the cylinder 522a. In other words, the pair of cylinders 522a have a threaded hole SH3a extending from the front to the rear (see below). Fig.11 , Fig.12 ). In addition, the rear first housing mounting portion 522 has through holes 522b that penetrate in the up-down direction at the left and right ends of the rear end portion. In addition, the rear first housing mounting portion 522 has threaded holes SH3b that extend from the top to the bottom at the left and right ends of the middle portion in the front-to-back direction (see the following). Fig.12 ). In addition, Fig. 9 In the embodiment, a bolt BO is inserted into the threaded hole SH3b. Fig.10 , Fig.11 As shown, the rear first housing mounting portion 522 has a protruding portion 522c protruding downward. The protruding portion 522c has a screw hole SH3c extending from left to right.

[0084] The DPF housing 211 has a protrusion 211a at its rear end portion that protrudes from the outer peripheral surface to the radially outer side based on the central axis of the housing. Specifically, the DPF housing 211 has protrusions 211a at the left and right lower portions. Each of the pair of protrusions 211a provided on the left and right sides has a through hole 211b that penetrates in the front-rear direction (see Fig. 9 ).

[0085] The bolts BO passing through the through holes 211b respectively provided in the pair of protruding pieces 211a are inserted into the threaded holes SH3a of the pair of cylindrical portions 522a, thereby fixing the rear first housing mounting portion 522 to the DPF housing 211. In addition, the bolts BO passing through the pair of through holes 522b provided at the rear end of the rear first housing mounting portion 522 are inserted into the threaded holes SH2 provided on the upper surface of the rear main body mounting portion 512 (see FIG. Figure 5 ), so that the rear first shell mounting portion 522 is fixed to the rear main body mounting portion 512. That is, the rear first shell mounting portion 522 is mounted on the rear main body mounting portion 512.

[0086] In addition, in this embodiment, if Figure 4As shown in the figure, the rear first housing mounting portion 522 is mounted on the side surface mounting portion 5S. The bolt BO passing through the through hole (not shown) provided on the upper part of the side surface mounting portion 5S is inserted into the threaded hole SH3c provided on the protruding portion 522c, so that the rear first housing mounting portion 522 is fixed to the side surface mounting portion 5S. Thus, the movement (vibration) of the rear first housing mounting portion 522 in the left-right direction can be suppressed.

[0087] like Figure 4 , Figure 8 as well as Fig. 9 As shown in FIGS. 1 and 1 , the rear second housing mounting portion 532 is mounted on the lower portion of the rear end side of the SCR housing 221 .

[0088] The rear second housing mounting portion 532 has a bottom wall portion 532a in the shape of a rectangular plate, which extends in the horizontal direction, and a vertical wall portion 532b in the shape of a triangular plate, which is formed to be bent upward from the rear end of the bottom wall portion 532a. The vertical wall portion 532b extends in a direction perpendicular to the front-rear direction. A pair of through holes 532c (see the following description) penetrating in the front-rear direction are provided at the upper left and lower right portions of the vertical wall portion 532b. Fig.10 , Fig.11 as well as Fig.13 ). In addition, Figure 8 , Fig. 9 In the embodiment, a nut NU is arranged behind each of the pair of through holes 532c, and the pair of through holes are hidden by the nut NU.

[0089] In addition, through holes 532c are provided at the left and right ends of the rear side of the bottom wall portion 532a, which penetrate in the vertical direction. In addition, an extension piece 532d extending toward the left direction is provided at the upper left end of the vertical wall portion 532b. A threaded hole SH4 (see below) is provided in the rectangular extension piece 532d, which penetrates in the front-rear direction. Fig.13 In detail, two threaded holes SH4 are provided at intervals in the upper and lower parts. Fig. 9 In the embodiment, bolts BO are inserted into a pair of threaded holes SH4.

[0090] A stud bolt SB protruding toward the rear is provided at the lower portion of the rear end surface of the SCR housing 221. Two stud bolts SB are provided corresponding to the pair of through holes 532c provided in the vertical wall portion 532b. When the two stud bolts SB are respectively passed through the through holes 532c provided in the vertical wall portion 532b, nuts NU are fitted into the stud bolts SB and tightened, thereby fixing the rear second housing mounting portion 532 to the SCR housing 221.

[0091] In addition, each bolt BO passed through the pair of left and right through holes 532c provided in the bottom wall portion 532a is inserted into the threaded hole SH2 provided on the upper surface of the rear body mounting portion 512 (see Figure 5), so that the rear second shell mounting portion 532 is fixed to the rear main body mounting portion 512. That is, the rear second shell mounting portion 532 is mounted on the rear main body mounting portion 512.

[0092] like Figure 8 As shown in the figure, the connecting portion 54 connects the first housing mounting portion 52 and the second housing mounting portion 53. By providing the connecting portion 54, the support strength of the exhaust gas purification device 2 using the first housing mounting portion 52 and the second housing mounting portion 53 can be improved. That is, when supporting the exhaust gas purification device 2, although the large support platform extending in the horizontal direction is eliminated to achieve lightweight, the reduction in the support strength of the exhaust gas purification device 2 can be suppressed.

[0093] In the present embodiment, the connecting portion 54 connects the rear first housing mounting portion 522 and the rear second housing mounting portion 532. In addition, in the present embodiment, only the rear mounting portion 5R includes the connecting portion 54, but the front mounting portion 5F may also include the connecting portion 54. That is, the connecting portion 54 may be configured to have at least one of a front connecting portion connecting the front first housing mounting portion 521 and the front second housing mounting portion 531, and a rear connecting portion connecting the rear first housing mounting portion 522 and the rear second housing mounting portion 532.

[0094] In this embodiment, as described above, the rear connecting portion 54 is provided to connect the rear first housing mounting portion 522 and the rear second housing mounting portion 532. In such a structure, by using the first hanging portion 251 and the second hanging portion 252 (see Figure 5 When the exhaust gas purification device 2 is suspended by the engine 100, the DPF housing 211 and the SCR housing 221 can be prevented from being separated. That is, when the exhaust gas purification device 2 is suspended for assembling the exhaust gas purification device 2 to the engine 100, for example, deformation of the inter-housing piping 23 can be prevented.

[0095] In this embodiment, if Figure 4 As shown in the figure, the electronic component 6 is mounted on the connecting portion 54. The electronic component 6 may be, for example, a sensor, a part of a sensor, or a connector. When the electronic component 6 is a sensor, the sensor may be, for example, a NOx sensor, a differential pressure sensor, or a temperature sensor. In the present embodiment, the electronic component 6 is a part of the NOx sensor. A part of the NOx sensor may be, for example, a processing unit that receives information from a sensing detection unit of the NOx sensor and processes the received information. The processing unit may be, for example, a structure including an IC chip. The electronic component 6 constituting a part of the NOx sensor outputs the processed information (data) to an upper controller (not shown).

[0096] By configuring the electronic component 6 to be mounted on the connecting portion 54, the electronic component 6 can be arranged away from heat sources such as the DPF housing 211. In addition, when the exhaust gas purification device 2 is assembled to the engine 100, the connecting portion 54 is mounted on the exhaust gas purification device 2 in the same manner as the first housing mounting portion 52 and the second housing mounting portion 53. That is, if the electronic component 6 is installed on the connecting portion 54, the electronic component 6 is also included in the exhaust gas purification device 2 that has been unitized, and the above-mentioned assembly operation can be performed. As a result, the increase in operation hours can be suppressed. In addition, the connecting portion 54 is arranged at the lower part of the exhaust gas purification device 2. Therefore, by configuring the electronic component 6 on the connecting portion 54, the electronic component 6 can be arranged in a place where vibration is as small as possible.

[0097] Fig.10 and Fig.11 2 is a schematic perspective view showing the relationship between the connecting portion 54, the rear first housing mounting portion 522, and the rear second housing mounting portion 532. Fig.10 and Fig.11 In the example, the direction of the object being observed is different. Fig.10 This is the image obtained by observing the object from the front. Fig.11 This is a picture obtained by observing the object from the rear. Fig.12 It is a schematic exploded perspective view showing the relationship between the connecting portion 54 and the rear first housing mounting portion 522 . Fig.13 It is a schematic exploded perspective view showing the relationship between the connecting portion 54 and the rear second housing mounting portion 532 .

[0098] like Figure 4 , Fig.10 as well as Fig.11 As shown in the figures, the connection portion 54 includes a setting portion 541 and a bending portion 542. The setting portion 541 is for setting the electronic component 6. The bending portion 542 is configured to be bent relative to the setting portion 541. The connection portion 54 is configured to include a bending portion, so that it can be easily mounted on the rear first housing mounting portion 522 and the rear second housing mounting portion 532 having different shapes from each other.

[0099] In detail, the setting portion 541 is a rectangular plate whose length direction extends in the left-right direction. The bending portion 542 has a first bending portion 5421 and a second bending portion 5422. The first bending portion 5421 is bent from the lower end of the setting portion 541 to one side in the front-rear direction (the front side in the present embodiment). The second bending portion 5422 is bent from one end in the left-right direction of the setting portion 541 (the left end in the present embodiment) to one side in the front-rear direction (the front side in the present embodiment). The first bending portion 5421 and the second bending portion 5422 are bent in the same direction relative to the setting portion 541, so that the two can be connected. Through this connection, the strength of the connecting portion 54 can be increased and vibration can be suppressed.

[0100] The plate-shaped setting portion 541 is arranged orthogonally to the front-to-back direction. The plate-shaped first bending portion 5421 extends in the horizontal direction. The plate-shaped second bending portion 5422 is inclined relative to the front-to-back direction and the left-to-right direction. The left end of the first bending portion 5421 and the lower end of the second bending portion 5422 are connected by welding. In addition, in the present embodiment, the connecting portion 54 has a third bending portion 5423 bent toward the rear side relative to the setting portion 541, but the third bending portion 5423 may not be provided.

[0101] In addition, the electronic component 6 can be mounted on either the front surface or the rear surface of the installation portion 541. In the present embodiment, as a preferred mode, it is mounted on the rear surface of the installation portion 541. Thus, for example, the electronic component 6 can be arranged away from heat sources such as the inter-case piping 23. The electronic component 6 is fixed to the installation portion 541 using bolts, for example.

[0102] In the present embodiment, a fixing portion 543 (see FIG. 5 ) for fixing the cable 61 constituting the NOx sensor is provided at the second bent portion 5422. Figure 4 The fixing portion 543 is, for example, a belt. By providing the fixing portion 543, the cables 61 can be compactly gathered. The fixing portion 543 is provided on the surface on the rear side of the second bent portion 5423.

[0103] like Fig.11 and Fig.12 As shown, a pair of cutouts 5421a are provided in the first bent portion 5421 of the connecting portion 54 and are arranged at intervals in the left-right direction. The cutouts 5421a extend rearward from the front end of the first bent portion 5421. The interval in the left-right direction of the pair of cutouts 5421a corresponds to the interval in the left-right direction of a pair of screw holes SH3b provided in the rear first housing mounting portion 522.

[0104] The connecting portion 54 is arranged above the rear first housing mounting portion 522. The connecting portion 54 is fixed to the rear first housing mounting portion 522 by two bolts BO that pass through a pair of notches 5421a and are inserted into a pair of threaded holes SH3b provided in the rear first housing mounting portion 522. In the present embodiment, the bolts BO pass through the notches 5421a, but a through hole may be used instead of the notches 5421a. However, in the case of using the notches 5421a as in the present embodiment, the bolts BO can be installed to the rear first housing mounting portion 522 while the connecting portion 54 is moved from the rear to the front while the bolts BO are first engaged in the threaded holes SH3b. If such an installation method is adopted, the influence of the inter-housing piping 23 existing above can be reduced, and the connecting portion 54 can be efficiently installed to the rear first housing mounting portion 522.

[0105] like Fig.10 and Fig.13 As shown, a pair of through holes 541a are provided at a right end of the setting portion 541 of the connecting portion 54 and are arranged at intervals in the vertical direction. The through holes 541a penetrate the setting portion 541 in the front-rear direction. The vertical interval of the pair of through holes 541a corresponds to the vertical interval of the pair of threaded holes SH4 provided in the extension piece 532d of the rear second housing mounting portion 532.

[0106] The connection part 54 is arranged in front of the extension piece 532d of the rear second housing mounting part 532. The connection part 54 is fixed to the rear second housing mounting part 532 by two bolts BO passing through a pair of through holes 541a provided in the setting part 541 and inserted into a pair of threaded holes SH4 provided in the extension piece 532d.

[0107] As can be seen from the above, the connection portion 54 is fixed to the rear first housing mounting portion 522 by the bolts BO tightened in the up-down direction. In addition, the connection portion 54 is mounted to the rear second housing mounting portion 532 by the bolts BO tightened in the front-back direction. By configuring in this way, vibrations of the connection portion 54 in multiple directions can be suppressed.

[0108] <3. Notes, etc.>

[0109] Various technical features disclosed in this specification can be modified in various ways without departing from the scope of the technical creation. In addition, multiple embodiments and modified examples shown in this specification can be combined and implemented within the possible scope.

[0110] <4. Notes>

[0111] An exemplary engine of the present invention may be of the following structure (first structure), comprising: an engine body; an exhaust gas purification device having a first shell and a second shell; and a bracket for mounting the exhaust gas purification device on the engine body, the bracket comprising: a first shell mounting portion mounted on the first shell; a second shell mounting portion mounted on the second shell; and a connecting portion connecting the first shell mounting portion with the second shell mounting portion.

[0112] The following structure (second structure) may be adopted, in which an electronic component is mounted on the above-mentioned connecting portion in addition to the engine of the above-mentioned first structure.

[0113] The following structure (third structure) may be adopted, that is, in the engine of the second structure, the connecting portion includes: a setting portion on which the electronic component is set; and a bending portion configured to be bent relative to the setting portion.

[0114] It may be the following structure (the fourth structure), that is, on the basis of the engine of the third structure, the length direction of the setting part extends along the left-right direction, and the bending part has: a first bending part, which bends from the lower end of the setting part to one side in the front-rear direction; and a second bending part, which bends from one end to one side in the left-right direction of the setting part.

[0115] It can be the following structure (the fifth structure), that is, the engine of any one of the first to fourth structures mentioned above comprises: a cooling fan, arranged in front of the above-mentioned engine body; and a flywheel, arranged behind the above-mentioned engine body, the above-mentioned bracket has a front side main body mounting portion installed on the front side of the above-mentioned engine body, and the above-mentioned front side main body mounting portion has a ventilation hole that passes through in the front-to-back direction.

[0116] The following structure (sixth structure) may be adopted, that is, based on the engine of the fifth structure, the bracket has a rear body mounting portion mounted on the rear side of the engine body, and the rear body mounting portion has a ventilation portion for allowing wind to flow in the front-rear direction.

[0117] It can be the following structure (seventh structure), that is, on the basis of the engine of the sixth structure, the first housing mounting portion comprises: a front first housing mounting portion, mounted on the front main body mounting portion; and a rear first housing mounting portion, mounted on the rear main body mounting portion, the second housing mounting portion comprises: a front second housing mounting portion, mounted on the front main body mounting portion; and a rear second housing mounting portion, mounted on the rear main body mounting portion, the connecting portion comprises at least one of a front connecting portion connecting the front first housing mounting portion with the front second housing mounting portion, and a rear connecting portion connecting the rear first housing mounting portion with the rear second housing mounting portion.

[0118] It may be the following structure (eighth structure), that is, based on an engine of any one of the first to seventh structures, the length directions of the first shell and the second shell extend in the front-to-back direction, the exhaust gas inlet of the exhaust gas purification device is arranged on one side of the front-to-back direction of the engine, and the bracket is constructed as follows: on the one side, the installation portion installed on the exhaust gas purification device is offset toward the inlet side compared with the installation portion installed on the engine body.

[0119] In the engine having any one of the first to eighth structures, the first housing and the second housing may include a suspension portion capable of suspending the exhaust gas purifying device (ninth structure).

Claims

1. An engine, characterized in that: have: Engine body; An exhaust gas purification device comprises a first shell and a second shell; and A bracket is used to mount the exhaust gas purification device on the engine body. The bracket has: A first housing mounting portion, mounted on the first housing; A second housing mounting portion, mounted on the second housing; as well as The connecting portion connects the first housing mounting portion and the second housing mounting portion.

2. The engine according to claim 1, characterized in that Electronic components are mounted on the connection portion.

3. The engine according to claim 2, characterized in that The connecting portion has: A setting part for setting the electronic component; and The bent portion is configured to be bent relative to the installation portion.

4. The engine according to claim 3, characterized in that The length direction of the setting portion extends in the left-right direction. The bending portion has: A first bent portion, bent from a lower end of the setting portion toward one side in a front-rear direction; and The second bent portion is bent from one end in the left-right direction of the installation portion to one side in the front-rear direction.

5. The engine according to claim 1, characterized in that have: a cooling fan disposed in front of the engine body; and A flywheel is arranged at the rear of the engine body. The bracket has a front side main body mounting portion mounted on the front side of the engine main body, The front main body mounting portion has a ventilation hole penetrating in the front-to-back direction.

6. The engine according to claim 5, characterized in that The bracket includes a rear main body mounting portion mounted on the rear side of the engine main body, and the rear main body mounting portion includes a ventilation portion that allows wind to flow in a front-rear direction.

7. The engine according to claim 6, characterized in that The first housing mounting portion comprises: A front first shell mounting portion, mounted on the front main body mounting portion; and The rear first shell mounting portion is mounted on the rear main body mounting portion, The second housing mounting portion comprises: A front second housing mounting portion, mounted on the front main body mounting portion; and The rear second housing mounting portion is mounted on the rear main body mounting portion, The connection portion includes at least one of a front connection portion connecting the front first housing mounting portion and the front second housing mounting portion, and a rear connection portion connecting the rear first housing mounting portion and the rear second housing mounting portion.

8. The engine according to any one of claims 1 to 7, characterized in that: The length direction of the first shell and the second shell extends along the front-to-back direction. The exhaust gas inlet of the exhaust gas purification device is arranged on one side of the engine in the front-rear direction. The bracket is configured such that, on the one side, a mounting portion for mounting the exhaust gas purifying device is offset toward the inlet side compared to a mounting portion for mounting the bracket on the engine body.

9. The engine according to any one of claims 1 to 7, characterized in that: The first housing and the second housing include a suspension portion capable of suspending the exhaust gas purifying device.

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