engine

Abstract

Rational modifications that utilize the cylinder head layout will prevent damage to the DPF support mechanism due to vibration. The engine includes a cylinder head, an exhaust manifold, a DPF that purifies exhaust gas from the exhaust manifold, and a support mechanism that supports the DPF at least on the cylinder head. The DPF is supported by the support mechanism in at least the vertical and longitudinal directions of the engine.

Description

[Technical field]

[0001] The present invention relates to an engine such as a diesel engine mounted on a work machine such as a construction machine or an agricultural machine. [Background technology]

[0002] Conventionally, there is known an engine in which a DPF for purifying exhaust gas from an exhaust manifold is disposed on the upper part of a cylinder head in a position perpendicular or nearly perpendicular to the rotation axis of a crankshaft in a plan view, and an intake collector for returning a part of the exhaust gas to an intake manifold as EGR gas is fixed to the intake manifold. In the above-mentioned engine, the DPF disposed on the upper part of the cylinder head is configured in a horizontal position perpendicular or nearly perpendicular to the rotation axis of the crankshaft in a plan view, so that the space occupied around the engine can be made more compact than when, for example, the DPF is disposed along the rotation axis of the crankshaft.

[0003] In order to support the DPF in the above-mentioned horizontal orientation on the engine, it has been necessary to As shown in the patent literature 1, the DPF is supported by the cylinder head and the intake manifold. This support mechanism supports the exhaust manifold side of the DPF. The inlet bracket for fixing to the left side of the cylinder head and the intake manifold for the DPF The outlet side bracket is used to secure the outlet side part to the front of the cylinder head. It is composed of a connecting bracket that connects the upper and lower middle parts of the racket to the intake manifold. is. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-178813 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned DPF support structure, the inlet bracket is attached to the left side of the cylinder head. The mounting position of the outlet bracket to the front of the cylinder head and the intake manifold The mounting position of the connecting bracket to the hold is relative to the rotation axis of the crankshaft in a plan view. The two are located close to each other on the perpendicular line segments. The vibrations generated by the DPF cause the DPF to move in the pitch direction (arrow in Figure 1) along the rotation axis of the crankshaft. It is prone to swaying in direction b). In particular, in the case of engines mounted on work machines such as skid steer loaders, The flywheel housing, which faces the output shaft of the equipment, is fitted with a large mass of hydraulic pumps for the equipment. The equipment to be driven (parts shown by phantom lines in Figs. 1 and 2) is fixedly connected. When the work machine travels over uneven ground or steps, the vertical vibration (in the direction of the arrow a in Figure 1) The large driven equipment amplifies the noise and pushes it towards the engine and DPF in the pitch direction (arrow b in Figure 1). At this time, the DPF is propagated as a vibration of the driven object at the top of the cylinder head. Since it is located on the end side away from the output shaft for the equipment, the DPF is larger than that of the engine. This could cause large swings in the pitch direction, which could result in damage to the DPF support mechanism.

[0006] In view of this situation, a main object of the present invention is to provide an engine that can suppress damage to the support mechanism of the DPF due to vibration by rationally modifying the arrangement of the cylinder head. [Means for solving the problem]

[0007] A first characteristic configuration of the present invention is an engine comprising a cylinder head, an exhaust manifold, a DPF for purifying exhaust gas from the exhaust manifold, and a support mechanism for supporting the DPF at least on the cylinder head, wherein the DPF is supported at least in the up-down and fore-and-aft directions of the engine by the support mechanism.

[0008] A second characteristic feature of the present invention is that the DPF is further supported in the left-right direction of the engine by the support mechanism.

[0009] A third characteristic feature of the present invention is that the support mechanism further supports the DPF on an intake manifold.

[0010] A fourth characteristic feature of the present invention is that a support base that supports the exhaust manifold side of the DPF is fixed to the cylinder head. [Brief description of the drawings]

[0011] [Figure 1] Left perspective view of a diesel engine [Diagram 2] Right perspective view of a diesel engine [Diagram 3] Perspective view of the engine top with the DPF separated [Figure 4] Left perspective view of DPF mounting area [Diagram 5] Right-side perspective view of the DPF mounting area [Figure 6] Front perspective view of the DPF mounting area [Figure 7] Exploded perspective view of the DPF mounting section [Figure 8] Assembly perspective view of DPF mounting part DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 show an example of an engine, which is a driving force mounted on work machines such as construction machines and agricultural machines. The diesel engine 1 is shown as a machine. For convenience, the exhaust manifold 7 is disposed on the left side of the diesel engine 1, and the intake manifold The side where the crankshaft 6 is arranged is the right side of the diesel engine 1. The direction of the rotation axis of the cooling fan (not shown) is the front side, and the side where the cooling fan (not shown) is arranged is the rear side. The side of the output shaft portion 2A of the crankshaft 2 relative to the device 100 is defined as the rear side. 1 and 2 are perspective views of the entire diesel engine 1. In order to clearly show the F40's support structure, the surrounding parts have been removed as appropriate. For example, Figure 6 shows the turbocharger 30 removed.

[0013] As shown in FIG. 1 and FIG. 2, the diesel engine 1 includes a crankshaft 2 for engine output and The engine is provided with a cylinder block 3 that houses a piston (not shown). A cylinder head 4 is fixed to the upper surface of the cylinder head 4, and a head cover 5 is fixed to the upper surface of the cylinder head 4. An intake manifold 6 is fixed to a right side surface 4c (see FIG. 7) of the cylinder head 4. An exhaust manifold 7 is fixed to the left side surface 4b of the cylinder head 4 (see FIG. 7). A fan shaft 8 that supports a cooling fan (not shown) is provided on the front surface of the cylinder block 3. A flywheel housing 9 is fixed to the rear surface of the cylinder block 3. In the flywheel housing 9, a crankshaft 2 is supported on the output shaft portion 2A at the rear end side of the crankshaft 2. A flywheel 10 is disposed on the rotor.

[0014] In this embodiment, as shown by the phantom lines in FIGS. 1 and 2, the flywheel housing 9 has A driving force having a large mass, such as a hydraulic pump for a work machine, is directly connected to the output shaft portion 2A of the crankshaft 2. The target device 100 is fixedly connected.

[0015] The intake system of the diesel engine 1 is provided with a compressor 32 of a turbocharger 30 described later. an intake pipe 15 connected to the exhaust gas recirculation (EGR) device 50; an intake collector 51 of the EGR device 50, which will be described later; and an intake manifold 6. And, it is equipped with.

[0016] As shown in FIG. 1, the turbocharger 30 is provided in the exhaust pipe 20. The turbine 31 and the compressor 32 are provided in the intake pipe 15. The compressor 1 rotates by the energy of the exhaust gas flowing through the exhaust pipe 20 and is coaxial with the turbine 31. The compressor 32 is driven by the air sucked through an air cleaner (not shown). The fresh air (outside air) that is coming in is compressed. "Fresh air" refers to air that does not contain EGR gas, which will be described later. The compressed air exceeding atmospheric pressure is sent to the intake air collector 51.

[0017] As shown in FIG. 6, the exhaust manifold 7 has an exhaust gas exhaust port that opens outward and upward. The exhaust gas discharge tube portion 21 is integrally formed. As shown in FIG. The gas inlet of the turbine 31 is connected to the gas outlet of the turbine 31. An elbow-shaped pipe joint is connected to the gas inlet of the turbine 31. The upstream end of the elbow-shaped pipe joint 22 is connected to the downstream end of the DPF. An upstream end of the exhaust manifold 23 connected to an exhaust gas introduction portion 42 of the exhaust manifold 23 is connected to the exhaust gas introduction portion 40 . As shown in FIGS. 1 and 2, the downstream connecting flange 23A of the exhaust connecting pipe 23 is The exhaust gas inlet 42 is connected to the connecting flange 42A of the exhaust gas inlet 42 by bolts. and the exhaust connecting pipe 23 form an exhaust pipe 20 .

[0018] As shown in FIG. 2, the intake manifold 6 receives compressed air via an intake pipe 15. The oil is divided into portions according to the number of cylinders and supplied to the cylinder head 4. The injector 16 is arranged to inject fuel at a predetermined timing. The injector 16 injects the fuel into the cylinder block 3. By driving the pistons inside the engine, the diesel engine 1 can generate power. do.

[0019] As shown in FIG. 1, the exhaust system of the diesel engine 1 includes an exhaust manifold 7 and a turbocharger. An exhaust pipe 20 in which a turbine 31 of a turbocharger 30 is provided, and a continuous regeneration type exhaust gas purification device and a DPF 40 constituting a part of the exhaust gas supply device.

[0020] The exhaust manifold 7 collects exhaust gases generated in multiple combustion chambers and supplies them to the turbocharger 30. The exhaust gas that passes through the exhaust manifold 7 is supplied to the EGR gas. The remaining part is purified by the DPF 40 and then returned to the intake system by the EGR device 50. It is discharged.

[0021] As shown in FIGS. 1 and 2, the EGR device 50 includes a part of the EGR gas from the exhaust manifold 7. Intake air is supplied to the intake manifold 6 by mixing the gas with fresh air supplied from the intake pipe 15. a collector 51; and an intake throttle member 52 that connects the intake pipe 15 to the intake collector 51. A recirculation exhaust gas recirculation (EGR) pipe is connected to the exhaust manifold 7 via an EGR cooler 53. an exhaust gas pipe 54, and an EGR valve portion that connects the intake collector 51 to the recirculated exhaust gas pipe 54; The EGR valve member 55 is provided with an EGR valve (not shown) and an EGR valve member 55. By adjusting this, the amount of EGR gas supplied to the intake collector 51 is adjusted.

[0022] With the above-mentioned configuration, fresh air (external air) is supplied from the intake pipe 15 into the intake collector 51 via the intake throttle member 52, while EGR gas is supplied from the exhaust manifold 7 into the intake collector 51 via the EGR valve member 55. The fresh air from the intake pipe 15 and the EGR gas from the exhaust manifold 7 are mixed in the intake collector 51 and then supplied to the intake manifold 6. That is, a portion of the exhaust gas discharged from the diesel engine 1 to the exhaust manifold 7 is recirculated from the intake manifold 6 to the diesel engine 1, thereby lowering the maximum combustion temperature during high load operation and reducing the amount of NOx (nitrogen oxides) emitted from the diesel engine 1.

[0023] The gas inlet of the EGR cooler 53 is an EGR gas intake formed integrally with the exhaust manifold 7. The gas outlet of the EGR cooler 53 is connected to the exhaust pipe 56, and the gas outlet of the EGR cooler 53 is connected to the exhaust pipe 56 via the pipe joint member 57. The exhaust gas return pipe 54 is connected to the pipe joint member 57. The pipe joint member 57 is bolted to the exhaust manifold 7. It is tied together.

[0024] The DPF 40 has an exhaust gas purification case 41 made of a heat-resistant metal material and having a cylindrical shape aligned in the left-right direction. The exhaust gas purification case 41 is provided with a left end portion on its outer circumferential surface. The exhaust gas introduction portion 42 is provided with an exhaust gas introduction port 42a (see FIG. 3) that is connected to the exhaust gas introduction port 42. The right end face of the exhaust gas purification case 41 is provided with a purification gas outlet for discharging purified exhaust gas. An exhaust port 43 is provided. The exhaust gas discharged from the purified gas exhaust port 43 is The exhaust gas is discharged to the outside via a container or tailpipe.

[0025] The exhaust gas purification case 41 is a platinum catalyst that generates nitrogen dioxide (NO2) as shown in FIG. A catalyst case body 45 in which a diesel oxidation catalyst 44 (gas purifier) ​​such as The honeycomb structure of the device continuously oxidizes and removes collected particulate matter (PM) at a relatively low temperature. and a filter case body 47 in which a gas filter 46 (gas purifier) ​​is mounted. The first connecting flange 45A provided at the gas outlet side end of the catalyst case body 45 and the filter case The second connecting flange 47A provided at the gas inlet side end of the base body 47 is connected from the left and right directions. The two parts are then fastened together with bolts and nuts.

[0026] 2 and 3, a purification gas is provided at the gas outlet end of the filter case body 47. The third connecting flange 49 is provided with a cover 48 having a gas discharge port 43. The rear side of the flange 49 is provided with split reinforcing flange plates 50A, 50B (see FIG. 1) which are divided in two in the circumferential direction. The lower split reinforcing flange plate 5 is fastened with bolts and nuts. 0A has a connecting plate portion 50a that protrudes radially outward from the third connecting flange 49. The connecting plate portion 50a is formed with a first bracket 70, which will be described later, from the left and right. A plurality of bolt insertion holes 50b for fastening with first bolts 74 and nuts 75 are formed. do. In this embodiment, as shown in FIG. 3, the bolt insertion holes 50b are The reinforcing flange plate 50A is formed at three locations in the circumferential direction on the lower side of the reinforcing flange plate 50A. The bolt insertion hole 50b located at the center in the circumferential direction is formed as a circular hole. The hole 50b is formed as a generally U-shaped notched hole that opens downward.

[0027] With the above-mentioned configuration, the nitrogen dioxide generated by the oxidation action of the diesel oxidation catalyst 44 is (NO2) is supplied to the soot filter 46. The particulate matter (PM) contained in the air is captured by the soot filter 46 and converted into nitrogen dioxide (NO 2) is continuously oxidized and removed. In addition to removing PM, it also removes carbon monoxide (CO) and hydrocarbons from the exhaust gas of diesel engines1. The content of hydrogen (HC) is reduced.

[0028] The diesel engine 1 configured as described above is particularly suitable for use in a work machine such as a skid steer loader. In the case of a diesel engine 1 mounted on a vehicle, as shown by the phantom lines in Figs. The wheel housing 9 is provided with a hydraulic pump for a work machine, which is directly connected to the output shaft portion 2A of the crankshaft 2. Therefore, the work machine is prevented from falling into the depression in the ground. When traveling over bumps or steps, the vertical vibration of the work machine (in the direction of the arrow a in Figure 1) The target device 100 amplifies the noise and the noise is applied to the diesel engine 1 and the DPF 40 in the pitch direction (see FIG. 1). The vibration propagates in the direction of the arrow b. At this time, the DPF 40 is above the cylinder head 4. The crankshaft 2 is provided at the front end portion of the crankshaft 2, which is spaced forward from the output shaft portion 2A of the crankshaft 2. Therefore, the phenomenon occurs in which the DPF40 swings more significantly in the pitch direction than in the diesel engine 1. To live.

[0029] Therefore, the support structure for the DPF 40 of the present invention is configured such that the intake side of the cylinder head 4 is The above-mentioned pitch vibration countermeasures were implemented by utilizing the rational modification. The specific structure will be described in detail. As shown in FIG. 3 to FIG. 8, the exhaust gas purification case 41 of the DPF 40 is disposed in the cylinder head 4 and the and the intake manifold 6 is supported thereon, and the crankshaft 2 is rotated in the direction of the axis of rotation of the crankshaft 2 from the support position. A support mechanism 60 is provided to support the intake collector 51 which is biased in the direction of the intake air. The structure 60 supports the exhaust gas purification case 41 to the cylinder head 4 and the intake manifold 6. A first support 61 for supporting the exhaust gas purification case 41 on the intake collector 51 and a second support 62 for supporting the exhaust gas purification case 41 on the intake collector 51. It is composed of a holder 62. Further, the first support 61 is provided on the exhaust gas purification case 41 on the intake manifold 6 side. A first bracket 70 that fixes the exhaust pipe to the cylinder head 4 and the intake manifold 6, and an exhaust pipe 71 that fixes the exhaust pipe to the cylinder head 4 and the intake manifold 6. The portion of the gas purification case 41 on the exhaust manifold 7 side is fixed to the cylinder head 4. It is composed of a fixing band 90. The second support 62 is installed between the first bracket 70 and the intake collector 51. The bracket 80 is made up of a second bracket 80.

[0030] As shown in FIGS. 5 to 7, the first bracket 70 serves to divide and reinforce the exhaust gas purification case 41. A first mounting plate portion 71 having a vertical posture along the front-rear direction and capable of abutting against the rear surface of the flange plate 50A; A second mounting plate portion 72 having a vertical orientation along the left-right direction capable of abutting against the front surface 4a of the cylinder head 4. and a pair of left and right mounting portions that can abut against a first mounting portion 65 formed on the upper surface of the front end portion of the intake manifold 6. and a third attachment plate portion 73 in a horizontal position along the direction. The second mounting plate portion 72 is disposed at a right angle on the inner side in the left-right direction at the front end of the first mounting plate portion 71. The cylinder head 4 is bent obliquely downward toward the left side of the front surface 4a of the cylinder head 4. The third mounting plate portion 73 is extended horizontally from the lower end of the first mounting plate portion 71. It is bent at a right angle inward in the left-right direction along the lateral direction.

[0031] As shown in FIGS. 5 to 7, an exhaust pipe is provided at the upper end of the first mounting plate portion 71 of the first bracket 70. The connecting plate portion 50a of the split reinforcing flange plate 50A of the exhaust gas purification case 41 is arranged in the left-right orientation. A plurality of first bolt insertion holes 71a for fastening with a first bolt 74 and a nut 75 are formed. There are. In this embodiment, the first bolt insertion hole 71a of the first mounting plate portion 71 is The reinforcement flanges 41 are formed at three locations corresponding to the circumferential direction of the split reinforcing flange plate 50A. The first bolt 74 is inserted into the first bolt insertion hole 71a at the center in the circumferential direction. The bolt 74 is inserted from the inside in the opposite direction to the bolt insertion hole 71a. The fixing band 90 is fixed to the support surface 91a of the support base 91 by screwing the fixing band 90 from the outside. With the exhaust gas purification case 41 of the DPF 40 placed, the lower split reinforcing flange plate 5 The bolt insertion hole 50b in the approximately "U"-shaped manner on the circumferential center side at 0A is the first bolt insertion hole 50b in the circumferential center The first bracket 74 is engaged and held from above. Since the DPF 40 is supported by the support base 91 of the fixing band 90 and the mat 70, the fixing operation of the DPF 40 is can be easily performed.

[0032] As shown in FIGS. 5 to 7, the lower end of the second mounting plate portion 72 is 4a in the right side portion of the first bolt 76 in the front-rear direction. A plurality of second bolt insertion holes 72a for fastening the bolts 72 are formed in the bolt holes 72a. In this embodiment, the second bolt insertion hole 72a of the second mounting plate portion 72 is the apex of a triangle. It is formed in three places.

[0033] As shown in FIGS. 4, 7 and 8, an intake manifold is attached to the tip of the third mounting plate portion 73. The third bolts are inserted into the first screw holes 65a formed in the first mounting portion 65 of the sixth embodiment. A plurality of third bolt insertion holes 73a for fastening at 77 are formed. In this embodiment, the third bolt insertion holes 73a of the third mounting plate portion 73 are spaced apart from each other by a predetermined distance in the front-rear direction. It is formed in two places spaced apart. As shown in FIG. 7, the first mounting portion 65 of the intake manifold 6 has two pillars 65A. The two pillars 65A are integrally connected in the front-rear direction, and the horizontal upper surfaces of the two pillars 65A are An open first screw hole 65a is formed.

[0034] As shown in FIGS. 7 and 8, the inner surface of the first mounting plate portion 71 of the first bracket 70 and the first A horizontal reinforcing plate 78 is fixed to the inner surface of the second mounting plate portion 72 by welding or the like. The inner surface of the first mounting plate portion 71 of the racket 70 is provided with a load that abuts against the upper surface of the reinforcing plate 78 from above. The heavy transmission plate 79 is connected to the first bolt together with the split reinforcing flange plate 50A of the exhaust gas purification case 41. The load transfer plate 79 is secured together with the bolt 74 and nut 75. Fourth bolts are inserted in three locations along the circumferential direction of the strong flange plate 50A. As shown in FIG. Nuts 75 are fixed by welding or the like to the positions corresponding to the fourth bolt insertion holes 79a on both sides. do.

[0035] With the above-mentioned configuration, a part of the load of the DPF 40 is borne by the reinforcing plate 78 of the first bracket 70. Since the first bracket 70 can be supported at the contact portion with the weight transmission plate 79, The first mounting plate portion 71 and the split reinforcing flange plate 50A on the exhaust gas purification case 41 side are fixed to the first bolt. Compared to the case where only the bolt 74 and nut 75 are used for fastening, the support mechanism 60 of the DPF 40 is made stronger. It can be configured.

[0036] The second bracket 80 is attached to the first mounting portion of the first bracket 70 as shown in FIGS. The inner surface of the attachment plate portion 71 is attached to a portion other than the attachment area of ​​the reinforcing plate 78 and the load transmission plate 79. A vertical plate portion 81 extending along the front-rear direction and capable of contacting the intake collector 51, and a protruding portion formed on the upper surface of the front end portion of the intake collector 51. A horizontal plate portion extending in the front-rear direction that can abut from above against the horizontal upper surface of the second mounting portion 66 (An example of a contact portion) 82. The vertical plate portion 81 is formed into a substantially L-shaped outline when viewed in the left-right direction, and the horizontal plate portion 8 2 is formed by bending the lower end of the vertical plate portion 81 at a right angle inward in the left-right direction.

[0037] As shown in FIG. 7, the upper end and the front end of the vertical plate portion 81 of the second bracket 80 are The third screw hole 81a of the vertical plate portion 81 is formed penetrating in the left-right direction. The fifth bolt is also inserted in the left-right direction through the first mounting plate portion 71 of the first bracket 70 corresponding to the bolt 1a. A bolt insertion hole 71b is formed. As shown in FIGS. 3 to 5 and 7, the vertical plate portion 81 of the second bracket 80 and the vertical plate portion 82 of the first bracket The first mounting plate portion 71 of 70 is a first bolt insertion hole 71b inserted into the fifth bolt insertion hole 71b in a left-right orientation. The fourth bolt 83 is fastened by screwing it into the third screw hole 81a.

[0038] As shown in FIG. 7, the horizontal plate portion 82 of the second bracket 80 has a sixth A bolt insertion hole 82a is formed, and the second mounting portion 66 of the intake collector 51 has an opening at the top. A second screw hole 66a is formed therein. In this embodiment, the sixth bolt insertion hole 82a of the horizontal plate portion 82 and the second bolt insertion hole 82b of the second mounting portion 66 are The screw holes 66a are formed at two positions in the front-rear direction. The through hole 82a is generally U-shaped in plan view and opens toward the intake manifold 6. A notch is formed in the groove. The horizontal plate portion 82 of the second bracket 80 and the second mounting portion 66 of the intake collector 51 The fifth bolt 84 in the vertical position is inserted into the sixth bolt insertion hole 82a of the horizontal plate portion 82. The second mounting portion 66 is fastened by screwing the second mounting portion 66 into a second screw hole 66 a of the second mounting portion 66 .

[0039] As shown in FIG. 3 and FIG. 5 to FIG. 8, the fixing band 90 is The exhaust manifold 7 is provided with an arc-shaped receiving surface 91a capable of receiving the exhaust manifold 7 side portion. The exhaust gas purification case 41 is placed on the support base 91, and the support base 91 is supported by the support base 91. and a flexible band member 92 that is pulled toward the band member 91a and fastened to the band member 92. As shown in FIG. 7, the lower end of the support base 91 is provided with a front end portion of the left side surface 4b of the cylinder head 4. In order to fasten the sixth bolt 94 in a left-right orientation to a plurality of fourth screw holes 93 formed in the portion A plurality of seventh bolt insertion holes 95 are formed.

[0040] As shown in FIGS. 5 to 8, a band member 9 is attached to the rear end of the receiving surface 91a of the support base 91. 2, a first screw insertion hole 97 into which a screw shaft 96a of a first fixing metal fitting 96 provided at one end of the The screw shaft 9 of the first fixing metal fitting 96 is inserted into the first screw insertion hole 97. 6a is a nut on the tip side of the screw shaft 96a protruding downward from the first screw insertion hole 97 (see FIG. 8). The bolt 96b is screwed in to prevent it from falling out. 3, 7, and 8, the front end of the receiving surface 91a of the support base 91 is provided with The screw shaft 98a of the second fixing metal fitting 98 provided at the other end of the band member 92 can be attached and detached from the front side. A second screw insertion hole 99 (see FIG. 8) having a generally U-shape in a plan view is formed by cutting out the second screw insertion hole 99. The nut 98 is attached to the tip side of the screw shaft 98a of the second fixing metal fitting 98 inserted into the second screw insertion hole 99. b is screwed in, and the nut 98b is tightened. The exhaust gas purification case placed on the support base 91 is subjected to a contraction change in diameter of the band member 92 caused by the bending operation. The bolt 41 is pulled toward the receiving surface 91a and then tightened and fixed.

[0041] In the support structure of the DPF 40 constructed as described above, as shown in FIG. 7 and FIG. An intake manifold 6 is firmly fixed to the right side surface 4c of the cylinder head 4 with a number of bolts. Furthermore, the intake collector 51 is attached to the outer surface of the intake manifold 6 by a plurality of bolts. Therefore, the cylinder head 4, the intake manifold 6, and the intake collector This means that the actuator 51 belongs to the same vibration system.

[0042] As shown in FIGS. 7 and 8, the intake manifold 6 is disposed on the right side surface 4 of the cylinder head 4. The intake collector 51 has a length extending from near the front end of the intake manifold c to near the rear end of the intake manifold c. The length extending from a position slightly rearwardly offset from the front end of the intake manifold 6 to near the rear end of the intake manifold 6 Therefore, as shown in FIG. 4 and FIG. 8, the intake manifold 6 has a front end portion on the upper surface thereof. The formed first attachment portion 65 is located slightly rearward of the front surface 4 a of the cylinder head 4 . The second mounting portion 66 is formed on the upper surface of the front end portion of the intake collector 51 and is connected to the intake manifold. The first mounting portion 65 of the door 6 is disposed slightly rearward.

[0043] Then, the second attachment of the first bracket 70 constituting one of the first supports 61 of the support mechanism 60 is As shown in FIG. 5 and FIG. 6, the mounting plate portion 72 is secured by a plurality of second bolts 76 arranged in the front-rear direction. The second mounting plate of the first bracket 70 is firmly fixed to the front surface 4a of the cylinder head 4. The fixed connection position between the portion 72 and the front surface 4a of the cylinder head 4 is such that the DPF 40 is fixed to the cylinder head 4 becomes the first supporting position P1. The first attachment of the intake manifold 6 is offset slightly rearward from the front surface 4a of the cylinder head 4. As shown in FIGS. 4, 5 and 8, the attachment portion 65 is provided with a third attachment plate portion of the first bracket 70. The third mounting plate portion 73 abuts against the first mounting plate 73 from above, and the abutted third mounting plate portion 73 is The intake manifold 6 is firmly fixed to the first mounting portion 65 of the intake manifold 6 by means of three bolts 77. The first mounting portion 65 of the nifold 6 and the third mounting plate portion 73 of the first bracket 70 are fixed together. The connecting position becomes a second support position P2 where the DPF 40 is supported by the intake manifold 6.

[0044] Furthermore, the first mounting plate portion 71 of the first bracket 70 is provided with a The vertical plate portion 81 of the second bracket 80 of the second support 62 is a first plate portion having a plurality of left-right orientations. The horizontal plate portion 82 of the second bracket 80 is fixed firmly to the intake manifold. The second mounting portion of the intake collector 51 is offset rearward from the first mounting portion 65 of the hold 6. The horizontal plate portion 82 abuts against the fifth bolt 66 from above, and the abutting horizontal plate portion 82 The second bracket 84 is firmly fixed to the second mounting portion 66 of the intake collector 51. The horizontal plate portion 82 of the intake air collector 51 is fixedly connected to the second mounting portion 66 of the intake air collector 51 at a position corresponding to the DPF 80. This results in a third support position P3 where the intake air collector 51 supports the intake air collector 51.

[0045] The first bracket 70 has a first mounting plate 71 to which an exhaust gas purification case for the DPF 40 is attached. The split reinforcing flange plate 50A of the base 41 is firmly secured by a plurality of first bolts 74 and nuts 75. In this connected state, the portion of the DPF 40 on the intake manifold 6 side is connected to the cylinder A first support position P1 on the front surface 4a side of the head 4 and a first mounting portion 6 of the intake manifold 6 5 side, and a third support position P2 which is the second mounting portion 66 side of the intake collector 51. The crankshaft 2 is supported at three points that are offset in the front-rear direction from the position P3. It is possible to improve the support strength against vibration in the pitch direction along the core direction. Compared to a case where the support mechanism 60 of the DPF 40 is fixed between different members of the vibration system, The occurrence of internal stress can be suppressed, and the support mechanism 60 can be constructed robustly. . Therefore, the intake collector 51, which is the arrangement on the intake side of the cylinder head 4, is used. The above-mentioned rational modification prevents damage to the support mechanism 60 of the DPF 40 caused by vibration in the pitch direction. It can be suppressed.

[0046] The first bracket 70 of the first support 61 is attached to the intake manifold of the DPF 40. 6 side portion, that is, the split reinforcing flange plate 50A of the exhaust gas purification case 41 and the cylinder The intake manifold 6 is provided between the front surface 4a of the head 4 and the first mounting portion 65 of the intake manifold 6. Therefore, the installation between the first bracket 70 and the second mounting portion 66 of the intake collector 51 is The distance is shorter than the distance between the DPF 40 and the intake air collector 51. Therefore, the second bracket 80 constituting the second support 62 can be made lighter and less expensive. It is possible.

[0047] Furthermore, the second bracket 80 of the second support 62 is fixed to the cylinder head 4 or the intake manifold. Compared with the case where the cylinder head is supported by the intake collector 51, the load is distributed to the intake collector 51, so that the cylinder head The rigidity of the intake manifold 4 and the intake manifold 6 can be ensured.

[0048] Other embodiments (1) In the above embodiment, the DPF 40 is a driven object in the upper part of the cylinder head 4. The diesel engine 1 is disposed on the end side away from the output shaft portion 2A for the equipment 100. However, the technology of the present invention is such that the DPF 40 is disposed at the outlet of the upper part of the cylinder head 4. The present invention can also be applied to a diesel engine 1 disposed at an end portion closer to the power shaft portion 2A. do.

[0049] (2) In the above embodiment, the first bracket 70 of the first support 61 and the second support 62 The first bracket 70 and the second bracket 80 are separately constructed. They may be integrally formed by bending or welding.

[0050] (3) In the above embodiment, the second bracket 80 of the second support 62 is 70 and the second mounting portion 66 of the intake collector 51. The exhaust pipe 80 may be installed across the DPF 40 and the second mounting portion 66 of the intake collector 51. stomach.

[0051] [Note] As described above, the engine according to an embodiment of the present invention is an engine in which a DPF that purifies exhaust gas from the exhaust manifold is disposed above a cylinder head, and may be configured to be provided with a support mechanism that supports the DPF at least on the cylinder head and the intake manifold.

[0052] In the above configuration, a support base that supports the exhaust manifold side of the DPF may be fixed to the cylinder head.

[0053] In the above configuration, an intake collector that recirculates a portion of the exhaust gas to the intake manifold as EGR gas may be fixed to the intake manifold, and a support mechanism may be provided that supports the DPF on the cylinder head, the intake manifold, and the intake collector.

[0054] In the above configuration, the support mechanism may include at least a first support that supports the DPF on the cylinder head and the intake manifold, and a second support that supports the DPF on the intake collector.

[0055] In the above configuration, the support mechanism may be provided with a first support position for supporting the DPF on the cylinder head, a second support position for supporting the DPF on the intake manifold, and a third support position for supporting the DPF on the intake collector, and the third support position may be disposed at a position offset in the direction of the rotational axis of the crankshaft with respect to the first support position and the second support position.

[0056] With the above-mentioned configuration, the DPF can be supported by a support mechanism that is supported by the cylinder head and the intake manifold, which share the same vibration system, and therefore the support strength against vibration can be improved. Moreover, compared to a case in which the DPF support mechanism is fixed between members with different vibration systems, the generation of internal stress in the support mechanism can be suppressed, and the support mechanism can be constructed to be sturdy. [Explanation of symbols]

[0057] 2 Crankshaft 2A Output shaft 4. Cylinder head 6. Intake manifold 7 Exhaust manifold 40 DPF 51 Intake collector 60 Support mechanism 61 1st support 62 Second support 66 Mounting part (second mounting part) 70 First Bracket 80 Second Bracket 82 Contact part (horizontal plate part) 84 Volts (5th Volt) 100 Driven Equipment P1 1st support position P2 2nd support position P3 3rd support position

Claims

1. A cylinder head; An exhaust manifold; A DPF that purifies exhaust gas from the exhaust manifold; A support mechanism for supporting the DPF at least on the cylinder head, The member that causes the support mechanism to support the DPF includes three members, The three support positions at which the DPF is supported by the three members are offset from one another in a front-rear direction parallel to an axial direction of a crankshaft.

2. 2. The engine of claim 1, The DPF is disposed at one end side in the front-rear direction and extends in the left-right direction.

3. 3. The engine of claim 2, an intake manifold disposed on the opposite side of the exhaust manifold in the left-right direction; The three components include the intake manifold in addition to the cylinder head.

4. 4. The engine of claim 3, The support mechanism includes a support base that supports the exhaust manifold side of the DPF, and the support base is fixed to the cylinder head.

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