JP7105277B2 - engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine such as a diesel engine mounted in a working machine such as a construction machine or an agricultural machine. Specifically, in the upper part of the cylinder head, a DPF for purifying the exhaust gas from the exhaust manifold is arranged in a posture orthogonal or substantially orthogonal to the rotation axis of the crankshaft in a plan view. An intake collector that recirculates a portion as EGR gas to the intake manifold relates to an engine that is fixed to the intake manifold.

In the above-described engine, the posture of the DPF disposed on the upper part of the cylinder head is configured in a lateral posture that is perpendicular or substantially perpendicular to the rotational axis of the crankshaft in a plan view. The space occupied around the engine can be made more compact than when it is arranged along the direction of the rotation axis of the shaft.

In order to support the sideways-oriented DPF on the engine, conventionally, as shown in Patent Document 1, a support mechanism for supporting the DPF on the cylinder head and the intake manifold is provided. The support mechanism includes an inlet-side bracket for fixing the exhaust manifold-side portion of the DPF to the left side surface of the cylinder head, an outlet-side bracket for fixing the intake manifold-side portion of the DPF to the front surface of the cylinder head, It is composed of a connection bracket that connects the upper and lower intermediate portions of the outlet side bracket and the intake manifold.

JP 2015-178813 A

In the above-described DPF support structure, the mounting position of the inlet side bracket on the left side surface of the cylinder head, the mounting position of the outlet side bracket on the front surface of the cylinder head, and the mounting position of the connection bracket on the intake manifold are the crankshaft in plan view. are arranged at positions close to each other with respect to a line segment in a direction orthogonal to the rotation axis. Therefore, the DPF tends to swing in the pitch direction (arrow direction b in FIG. 1) along the rotation axis direction of the crankshaft due to vibrations propagated to the engine.
In particular, in the case of an engine mounted on a work machine such as a skid steer loader, the flywheel housing facing the output shaft for the machine to be driven, such as a hydraulic pump for the machine to be driven (Fig. 1 , the portion indicated by the phantom lines in FIG. 2) are fixedly connected. Therefore, when the work machine travels over uneven ground or steps, the vertical vibration of the work machine (in the direction of the arrow a in Fig. 1) is amplified by the driven equipment with a large mass, causing the engine and DPF to move in the pitch direction (in the direction of the arrow in Fig. 1). Propagated as sway in arrow direction b). At this time, since the DPF is disposed on the upper side of the cylinder head on the end portion side away from the side of the output shaft portion for the driven equipment, the DPF swings in the pitch direction more than the engine, and the DPF support mechanism is damaged. Damage may occur.

In view of this situation, the main object of the present invention is to provide an engine capable of suppressing damage to the DPF support mechanism due to vibration by rationally modifying the arrangement of the cylinder head on the intake side. be.

A first characteristic configuration according to the present invention is an engine in which a DPF for purifying exhaust gas from an exhaust manifold is disposed above a cylinder head, and the DPF is supported by at least the cylinder head and the intake manifold. The point is that a mechanism is provided.

A second characteristic configuration according to the present invention resides in that a support that supports the exhaust manifold side of the DPF is fixed to the cylinder head.

In a third characteristic configuration according to the present invention, an intake collector that recirculates part of the exhaust gas as EGR gas to the intake manifold is fixed to the intake manifold, and the DPF is arranged between the cylinder head, the intake manifold and the intake air. The point is that the support mechanism for supporting the collector is provided.

In a fourth characteristic configuration according to the present invention, the support mechanism includes at least a first support for supporting the DPF on the cylinder head and the intake manifold, and a second support for supporting the DPF on the intake collector. It is in the point of containing.

A fifth characteristic configuration according to the present invention is that the support mechanism includes 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 second support position for supporting the DPF on the intake manifold. and a third support position supported by the intake collector, wherein the third support position is arranged at a position displaced from the first support position and the second support position in the rotation axis direction of the crankshaft. in that it is

According to the above configuration, the DPF can be supported by the support mechanism supported by the cylinder head and the intake manifold having the same vibration system, so that the support strength against vibration can be improved. Moreover, compared to the case where the support mechanism of the DPF is fixed between different members of the vibration system, the generation of internal stress in the support mechanism can be suppressed, and the support mechanism can be constructed robustly.

Perspective view of the left side of a diesel engine Perspective view of the right side of a diesel engine Perspective view of the upper part of the engine with the DPF separated Perspective view of the left side of the DPF mounting part Perspective view of the right side of the mounting part of the DPF Front side perspective view of DPF mounting part Disassembled perspective view of DPF mounting part Assembling perspective view of DPF mounting part

An embodiment of the present invention will be described based on the drawings.
1 and 2 show an example of an engine, showing a diesel engine 1 as a prime mover mounted on working machines such as construction machines and agricultural machines. In describing the diesel engine 1 , for convenience, the side where the exhaust manifold 7 is arranged is the left side of the diesel engine 1 , and the side where the intake manifold 6 is arranged is the right side of the diesel engine 1 . Further, the direction of the rotation axis of the crankshaft (engine output shaft) 2 is defined as the front-rear direction, the arrangement side of the cooling fan (not shown) is defined as the front side, and the output shaft portion 2A side of the crankshaft 2 with respect to the driven device 100 is defined as the rear side. do.
1 and 2 show perspective views of the entire diesel engine 1. FIG. In order to clearly show the support structure of the DPF 40, FIGS. 3 to 8 show a state in which peripheral parts are appropriately removed. For example, FIG. 6 shows a state in which the turbocharger 30 is removed.

As shown in FIGS. 1 and 2, the diesel engine 1 includes a crankshaft 2 for engine output and a cylinder block 3 containing pistons (not shown). A cylinder head 4 is fixed to the upper surface of the cylinder block 3 , and a head cover 5 is fixed to the upper surface of the cylinder head 4 . An intake manifold 6 is fixed to the right side surface 4c of the cylinder head 4 (see FIG. 7), and 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 , and a flywheel 10 is arranged in the flywheel housing 9 .

In the present embodiment, as shown by the phantom lines in FIGS. 1 and 2, the flywheel housing 9 includes a drive target device having a large mass, such as a hydraulic pump for working equipment, which is directly connected to the output shaft portion 2A of the crankshaft 2. 100 are fixedly connected.

The intake system of the diesel engine 1 includes an intake pipe 15 provided with a compressor 32 of a turbocharger 30 described later, an intake collector 51 of an EGR device 50 described later, and an intake manifold 6 .

As shown in FIG. 1 , the turbocharger 30 includes a turbine 31 of the turbocharger 30 provided in the exhaust pipe 20 and a compressor 32 provided in the intake pipe 15 . The turbine 31 is rotated by the energy of exhaust gas flowing through the exhaust pipe 20 to drive a compressor 32 coaxial with the turbine 31 . The compressor 32 compresses fresh air (outside air) sucked through an air cleaner (not shown). "Fresh air" is air that does not contain EGR gas, which will be described later. The pressurized air, which is compressed above atmospheric pressure, is directed to intake collector 51 .

As shown in FIG. 6, the exhaust manifold 7 is integrally formed with an exhaust gas discharge tubular portion 21 that opens outward and upward. As shown in FIG. 1, a gas inlet portion of a turbine 31 is connected to the exhaust gas discharge tubular portion 21, and an upstream end portion of an elbow-shaped pipe joint 22 is connected to a gas outlet portion of the turbine 31. ing. The downstream end of the elbow-shaped pipe joint 22 is connected to the upstream end of the exhaust coupling pipe 23 connected to the exhaust gas introduction portion 42 of the DPF 40 . A connecting flange 23A on the downstream side of the exhaust connecting pipe 23 is bolted to a connecting flange 42A of the exhaust gas introducing portion 42 of the DPF 40, as shown in FIGS. The exhaust pipe 20 is composed of the pipe joint 22 and the exhaust connecting pipe 23 described above.

As shown in FIG. 2, the intake manifold 6 divides the pressurized air supplied through the intake pipe 15 into a number corresponding to the number of cylinders and supplies the divided air to the cylinder head 4 . An injector (fuel injection device) 16 is arranged in the cylinder head 4 . The injector 16 injects fuel into the combustion chamber at a predetermined timing. The injector 16 injects fuel to drive the piston in the cylinder block 3, so that the diesel engine 1 can generate power.

The exhaust system of the diesel engine 1, as shown in FIG. And prepare.

The exhaust manifold 7 collectively supplies the exhaust gas generated in the plurality of combustion chambers to the turbine 31 of the turbocharger 30 . A portion of the exhaust gas that has passed through the exhaust manifold 7 is recirculated to the intake system by the EGR device 50 as EGR gas, and the rest is purified by the DPF 40 and then discharged.

As shown in FIGS. 1 and 2, the EGR device 50 includes an intake collector 51 that mixes part of the EGR gas from the exhaust manifold 7 with fresh air supplied from the intake pipe 15 and supplies the mixture to the intake manifold 6 . , an intake throttle member 52 that connects the intake pipe 15 to the intake collector 51, a recirculation exhaust gas pipe 54 as a recirculation pipe connected to the exhaust manifold 7 via an EGR cooler 53, and the recirculation exhaust gas pipe 54. and an EGR valve member 55 that communicates with the intake collector 51 . By adjusting the opening of an EGR valve (not shown) in the EGR valve member 55, the amount of EGR gas supplied to the intake collector 51 is adjusted.

With the above configuration, fresh air (outside air) is supplied from the intake pipe 15 through the intake throttle member 52 into the intake collector 51, while EGR gas is supplied from the exhaust manifold 7 through the EGR valve member 55 into the intake collector 51. supply. Fresh air from the intake pipe 15 and EGR gas from the exhaust manifold 7 are mixed in the intake collector 51 and then supplied to the intake manifold 6 . That is, part 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, so that the maximum combustion temperature during high-load operation decreases, and the diesel engine 1 NOx (nitrogen oxide) emissions are reduced.

A gas inlet portion of the EGR cooler 53 is connected to an EGR gas extraction pipe 56 integrally formed with the exhaust manifold 7, and a gas outlet portion of the EGR cooler 53 is connected to a recirculation exhaust gas pipe 54 via a pipe joint member 57. It is The pipe joint member 57 is bolted to the exhaust manifold 7 .

The DPF 40 includes a cylindrical exhaust gas purification case 41 made of a heat-resistant metal material extending in the left-right direction. An exhaust gas introduction portion 42 having an exhaust gas introduction port 42a (see FIG. 3) that opens rearward is protrusively formed on the left end side of the outer peripheral surface of the exhaust gas purification case 41 . A right end face of the exhaust gas purification case 41 is provided with a purified gas outlet 43 for discharging the purified exhaust gas. Exhaust gas discharged from this purified gas discharge port 43 is discharged to the outside through a silencer and a tail pipe.

As shown in FIG. 3, the exhaust gas purification case 41 includes a catalyst case body 45 in which a diesel oxidation catalyst 44 (gas purification body) such as platinum that generates nitrogen dioxide (NO2) is installed, and a collected A filter case body 47 is provided in which a soot filter 46 (gas purifying body) having a honeycomb structure for continuously oxidizing and removing particulate matter (PM) at a relatively low temperature is mounted inside. The first connection flange 45A provided at the gas outlet side end of the catalyst case body 45 and the second connection flange 47A provided at the gas inlet side end of the filter case body 47 are joined in the left-right direction. Fastened with bolts and nuts.

As shown in FIGS. 2 and 3, the end of the filter case body 47 on the gas outlet side is provided with a lid body 48 having a purified gas discharge port 43 and a third connecting flange 49 . Divided reinforcing flange plates 50A and 50B (see FIG. 1) divided in the circumferential direction are fastened to the rear side of the third connecting flange 49 with bolts and nuts. A connecting plate portion 50a projecting radially outward from the third connecting flange 49 is formed integrally with the lower divided reinforcing flange plate 50A. The connecting plate portion 50a is formed with a plurality of bolt insertion holes 50b for fastening the later-described first bracket 70 with first bolts 74 and nuts 75 from the left and right directions.
In this embodiment, as shown in FIG. 3, the bolt insertion holes 50b are formed at three locations in the circumferential direction below the split reinforcement flange plate 50A on the exhaust gas purification case 41 side. The bolt insertion holes 50b located on both sides in the circumferential direction are formed as circular holes, and the bolt insertion hole 50b located in the center in the circumferential direction is formed as a substantially "U"-shaped notch hole that opens downward. .

Nitrogen dioxide (NO 2 ) generated by the oxidation action of the diesel oxidation catalyst 44 is supplied into the soot filter 46 by the above configuration. Particulate matter (PM) contained in the exhaust gas of the diesel engine 1 is collected by the soot filter 46 and continuously oxidized and removed by nitrogen dioxide (NO2). In addition to removing particulate matter (PM) in the exhaust gas of the diesel engine 1, the content of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 1 is reduced.

In the case of the diesel engine 1 configured as described above, particularly in the case of the diesel engine 1 mounted on a work machine such as a skid steer loader, the flywheel housing 9 has a A drive target device 100 having a large mass, such as a working machine hydraulic pump, which is directly connected to the output shaft portion 2A of the crankshaft 2, is fixedly connected. Therefore, when the work machine travels over an uneven ground or steps, the vertical vibration of the work machine (in the direction of the arrow a in FIG. 1) is amplified by the drive target device 100 having a large mass, causing the diesel engine 1 and the DPF 40 to move in the pitch direction ( Propagated as a sway in the direction of the arrow b) in FIG. At this time, since the DPF 40 is disposed on the front end portion side separated forward from the output shaft portion 2A side of the crankshaft 2 in the upper portion of the cylinder head 4, the DPF 40 swings in the pitch direction more than the diesel engine 1. phenomenon occurs.

Therefore, the support structure of the DPF 40 of the present invention is a rational modification that utilizes the arrangement of the air supply side of the cylinder head 4 to take measures against the vibration in the above-described pitch direction. will be described in detail.
As shown in FIGS. 3 to 8, the exhaust gas purification case 41 of the DPF 40 is supported by the cylinder head 4 and the intake manifold 6, and the intake collector is displaced from the support position in the direction of the rotation axis of the crankshaft 2. A support mechanism 60 is provided to support the 51 . The support mechanism 60 is composed of a first support 61 that supports the exhaust gas purification case 41 on the cylinder head 4 and the intake manifold 6, and a second support 62 that supports the exhaust gas purification case 41 on the intake collector 51. there is
Furthermore, the first support member 61 includes a first bracket 70 that fixes a portion of the exhaust gas purification case 41 on the side of the intake manifold 6 to the cylinder head 4 and the intake manifold 6, and a portion of the exhaust gas purification case 41 on the side of the exhaust manifold 7. to the cylinder head 4.
The second support 62 is composed of a second bracket 80 that spans the first bracket 70 and the intake air collector 51 .

As shown in FIGS. 5 to 7, the first bracket 70 includes a first mounting plate portion 71 having a vertical posture along the front-rear direction and capable of coming into contact with the rear surface of the divided reinforcing flange plate 50A of the exhaust gas purification case 41, and a cylinder A second mounting plate portion 72 in a vertical position along the left-right direction that can contact the front surface 4a of the head 4, and a first mounting portion 65 formed on the upper surface of the front end portion of the intake manifold 6 in the left-right direction that can contact. and a third mounting plate portion 73 in a horizontal posture along the vertical direction.
The second mounting plate portion 72 is formed by bending the front end of the first mounting plate portion 71 inward in the left-right direction at a right angle and extending obliquely downward toward the left portion of the front surface 4 a of the cylinder head 4 . ing. The third mounting plate portion 73 is formed by bending the lower end of the first mounting plate portion 71 inward in the horizontal direction at a right angle.

As shown in FIGS. 5 to 7, the connection plate portion 50a of the split reinforcing flange plate 50A of the exhaust gas purification case 41 is attached to the upper end portion of the first mounting plate portion 71 of the first bracket 70 in the first lateral direction posture. A plurality of first bolt insertion holes 71a for fastening with bolts 74 and nuts 75 are formed.
In the present embodiment, the first bolt insertion holes 71a of the first mounting plate portion 71 are formed at three locations corresponding to the circumferential direction of the divided reinforcing flange plate 50A of the exhaust gas purification case 41 . The first bolt 74 inserted through the first bolt insertion hole 71a at the center in the circumferential direction is inserted from the inner side opposite to the first bolt 74 inserted through the first bolt insertion holes 71a on both sides in the circumferential direction, The nut 75 is screwed from the outside. This is a state in which the exhaust gas purification case 41 of the DPF 40 is placed on the receiving surface 91a of the support base 91 of the fixing band 90, and the substantially "U" shape on the circumferential center side of the lower divided reinforcing flange plate 50A. is engaged with the first bolt 74 at the center in the circumferential direction from above. As a result, the load of the DPF 40 is placed and supported by the first bracket 70 and the support base 91 of the fixing band 90, so that the fixing operation of the DPF 40 can be easily performed.

At the lower end of the second mounting plate portion 72, as shown in FIGS. 5 to 7, a plurality of screw holes (not shown) formed in the right portion of the front surface 4a of the cylinder head 4 are provided with a second mounting plate portion 72 having a front-rear orientation. A plurality of second bolt insertion holes 72a for fastening with bolts 76 are formed.
In this embodiment, the second bolt insertion holes 72a of the second mounting plate portion 72 are formed at three vertices of a triangle.

As shown in FIGS. 4, 7 and 8, the tip of the third mounting plate portion 73 has a plurality of first screw holes 65a formed in the first mounting portion 65 of the intake manifold 6 with vertical orientation. A plurality of third bolt insertion holes 73a for fastening with third bolts 77 are formed.
In this embodiment, the third bolt insertion holes 73a of the third mounting plate portion 73 are formed at two locations spaced apart by a predetermined distance in the front-rear direction.
As shown in FIG. 7, the first attachment portion 65 of the intake manifold 6 is formed by integrally joining two columnar bodies 65A in the front-rear direction. is formed with a first screw hole 65a opening to the .

Further, as shown in FIGS. 7 and 8, a horizontal reinforcing plate 78 extending over the inner surface of the first mounting plate portion 71 and the inner surface of the second mounting plate portion 72 of the first bracket 70 is fixed by welding or the like. On the inner surface of the first mounting plate portion 71 of the first bracket 70, a load transmission plate 79 abutting on the upper surface of the reinforcing plate 78 from above is attached to the first bolt 74 together with the split reinforcing flange plate 50A of the exhaust gas purification case 41.・They are fixed by tightening together with a nut 75 . Therefore, a fourth bolt insertion hole 79a penetrating in the left-right direction is formed in each of three locations along the circumferential direction of the divided reinforcing flange plate 50A in the load transmission plate 79. As shown in FIG. As shown in FIG. 7, nuts 75 are fixed by welding or the like to portions of the inner surface of the load transmission plate 79 corresponding to the fourth bolt insertion holes 79a on both sides in the circumferential direction.

With the above configuration, part of the load of the DPF 40 can also be supported at the contact portion between the reinforcing plate 78 of the first bracket 70 and the load transmission plate 79, so that the first attachment plate portion of the first bracket 70 The support mechanism 60 for the DPF 40 can be made stronger than when the 71 and the split reinforcing flange plate 50A on the side of the exhaust gas purifying case 41 are fastened only with the first bolts 74 and nuts 75 .

As shown in FIGS. 4, 7 and 8, the second bracket 80 is mounted on the inner surface of the first mounting plate portion 71 of the first bracket 70 except for the mounting region of the reinforcing plate 78 and the load transmission plate 79. A vertical plate portion 81 extending in the front-rear direction and capable of coming into contact with the horizontal upper surface of the second mounting portion 66 protruding from the upper surface of the front end portion of the intake collector 51, and a horizontal plate extending in the front-rear direction capable of contacting from above. A plate portion (an example of a contact portion) 82 is provided.
The vertical plate portion 81 is formed in a substantially “L”-shaped outline when viewed in the left-right direction, and the horizontal plate portion 82 is bent inward in the left-right direction at a right angle at the lower end of the vertical plate portion 81 . .

As shown in FIG. 7, the vertical plate portion 81 of the second bracket 80 has an upper end portion and a front end portion each formed with a third screw hole 81a penetrating in the left-right direction. The first mounting plate portion 71 of the first bracket 70 corresponding to the third screw hole 81a of the vertical plate portion 81 is also formed with a fifth bolt insertion hole 71b penetrating in the left-right direction.
As shown in FIGS. 3 to 5 and 7, the vertical plate portion 81 of the second bracket 80 and the first mounting plate portion 71 of the first bracket 70 are positioned in the horizontal direction in which they are inserted through the fifth bolt insertion holes 71b. is fastened by screwing the fourth bolt 83 into the third screw hole 81a.

As shown in FIG. 7, the horizontal plate portion 82 of the second bracket 80 is formed with a sixth bolt insertion hole 82a penetrating vertically, and the second mounting portion 66 of the intake collector 51 is open upward. A second screw hole 66a is formed.
In this embodiment, the sixth bolt insertion hole 82a of the horizontal plate portion 82 and the second screw hole 66a of the second mounting portion 66 are formed at two locations in the front-rear direction. Further, the sixth bolt insertion hole 82a of the horizontal plate portion 82 is cut out in a substantially "U" shape opening toward the intake manifold 6 side in a plan view.
Then, the horizontal plate portion 82 of the second bracket 80 and the second attachment portion 66 of the intake collector 51 connect the fifth bolt 84 in the up-down direction, which is inserted into the sixth bolt insertion hole 82a of the horizontal plate portion 82, to the second mounting portion 66 of the intake collector 51. It is fastened by screwing it into the second screw hole 66 a of the mounting portion 66 .

As shown in FIGS. 3 and 5 to 8, the fixing band 90 has an arc-shaped receiving surface 91a capable of receiving a portion of the exhaust gas purification case 41 on the exhaust manifold 7 side. A flexible band member 92 that draws the exhaust gas purification case 41 placed on the support base 91 toward the receiving surface 91a and tightens and fixes it.
As shown in FIG. 7, at the lower end of the support base 91, a plurality of fourth screw holes 93 formed in the front end portion of the left side surface 4b of the cylinder head 4 are fastened with sixth bolts 94 positioned in the left-right direction. A plurality of seventh bolt insertion holes 95 are formed for this purpose.

At the rear end of the receiving surface 91a of the support base 91, as shown in FIGS. An insertion hole 97 is formed therethrough. The screw shaft 96a of the first fixing fitting 96 inserted into the first screw insertion hole 97 is screwed with a nut 96b on the distal end side of the screw shaft 96a projecting downward from the first screw insertion hole 97 (see FIG. 8). By doing so, it is fixed to prevent it from coming off.
3, 7, and 8, a threaded shaft 98a of a second fixing member 98 provided at the other end of the band member 92 is attached to the front end of the receiving surface 91a of the support base 91. A second screw insertion hole 99 (see FIG. 8), which is detachable from the front side and has a substantially U-shaped plan view, is cut out. A nut 98b is screwed onto the distal end side of the screw shaft 98a of the second fixing member 98 inserted into the second screw insertion hole 99, and the nut 98b is tightened to the tightening side. Due to the change in the diameter of the band member 92 due to the tightening operation of the nut 98b, the exhaust gas purification case 41 placed on the support base 91 is drawn toward the receiving surface 91a and tightened and fixed.

In the support structure for the DPF 40 constructed as described above, the intake manifold 6 is firmly fixed to the right side surface 4c of the cylinder head 4 with a plurality of bolts, as shown in FIGS. Furthermore, an intake collector 51 is firmly fixed to the outer surface of the intake manifold 6 with a plurality of bolts. Therefore, the cylinder head 4, the intake manifold 6, and the intake collector 51 belong to the same vibration system.

7 and 8, the intake manifold 6 has a length extending from the vicinity of the front end of the right side surface 4c of the cylinder head 4 to the vicinity of the rear end thereof. The intake collector 51 has a length extending from a position slightly rearwardly displaced from the front end of the intake manifold 6 to near the rear end of the intake manifold 6 . Therefore, as shown in FIGS. 4 and 8 , the first attachment portion 65 formed on the upper surface of the front end portion of the intake manifold 6 is located slightly behind the front surface 4 a of the cylinder head 4 . A second mounting portion 66 protruding from the upper surface of the front end portion of the intake collector 51 is positioned slightly rearwardly relative to the first mounting portion 65 of the intake manifold 6 .

As shown in FIGS. 5 and 6, the second mounting plate portion 72 of the first bracket 70, which constitutes one of the first supports 61 of the support mechanism 60, has a plurality of second bolts 76 in the front-rear direction. It is firmly fixed to the front surface 4a of the cylinder head 4 by . A fixed connection position between the second mounting plate portion 72 of the first bracket 70 and the front surface 4 a of the cylinder head 4 is a first support position P<b>1 at which the DPF 40 is supported by the cylinder head 4 .
As shown in FIGS. 4, 5 and 8, the third mounting plate portion of the first bracket 70 is mounted on the first mounting portion 65 of the intake manifold 6 which is slightly deviated rearward from the front surface 4a of the cylinder head 4. 73 abuts from above, and the abutted third mounting plate portion 73 is firmly fixed to the first mounting portion 65 of the intake manifold 6 with a plurality of vertically oriented third bolts 77 . The fixed connection position between the first mounting portion 65 of the intake manifold 6 and the third mounting plate portion 73 of the first bracket 70 is the second support position P2 at which the DPF 40 is supported by the intake manifold 6 .

Furthermore, as shown in FIGS. 4, 5, and 8, a plurality of vertical plate portions 81 of the second bracket 80 of the second support 62 are attached to the first mounting plate portion 71 of the first bracket 70 on the left and right sides. It is firmly fixed by the fourth bolt 83 in the directional orientation. The horizontal plate portion 82 of the second bracket 80 abuts from above the second mounting portion 66 of the intake collector 51 that is deviated to the rear side of the first mounting portion 65 of the intake manifold 6, and the horizontal plate portion The portion 82 is firmly fixed to the second attachment portion 66 of the intake collector 51 with a plurality of vertical fifth bolts 84 . A fixed connection position between the horizontal plate portion 82 of the second bracket 80 and the second attachment portion 66 of the intake collector 51 is a third support position P3 at which the DPF 40 is supported by the intake collector 51 .

The split reinforcement flange plate 50A of the exhaust gas purification case 41 of the DPF 40 is firmly connected to the first attachment plate portion 71 of the first bracket 70 with a plurality of first bolts 74 and nuts 75 . In this connected state, the portion of the DPF 40 on the side of the intake manifold 6 is a first support position P1 on the front surface 4a side of the cylinder head 4, a second support position P2 on the first mounting portion 65 side of the intake manifold 6, It is supported at three points that are deviated in the front-rear direction from the third support position P3 on the side of the second attachment portion 66 of the intake collector 51 . As a result, the support strength against vibration in the pitch direction along the rotation axis direction of the crankshaft 2 can be improved. Moreover, compared to the case where the support mechanism 60 of the DPF 40 is fixed between different members of the vibration system, the generation of internal stress in the support mechanism 60 can be suppressed, and the support mechanism 60 can be configured to be robust.
Therefore, the rational modification using the intake collector 51, which is the arrangement configuration on the air supply side of the cylinder head 4, can suppress damage to the support mechanism 60 of the DPF 40 due to vibration in the pitch direction.

In addition, the first bracket 70 of the first support 61 is a portion of the DPF 40 on the side of the intake manifold 6, that is, the divided reinforcement flange plate 50A of the exhaust gas purification case 41, the front surface 4a of the cylinder head 4, and the intake manifold 6. Since it is provided between the first bracket 70 and the second mounting portion 66 of the intake collector 51, the installation distance between the first bracket 70 and the second mounting portion 66 of the intake collector 51 is equal to the distance between the DPF 40 and the intake collector 51. shorter than As the installation distance is shortened, the second bracket 80 constituting the second support 62 can be made lighter and less expensive.

Furthermore, compared to the case where the second bracket 80 of the second support member 62 is supported by the cylinder head 4 or the intake manifold 6, the rigidity of the cylinder head 4 and the intake manifold 6 can be ensured by distributing the load on the intake collector 51. can be done.

[Other embodiments]
(1) In the above-described embodiment, the DPF 40 has been described for the diesel engine 1 in which the DPF 40 is arranged on the end portion side away from the output shaft portion 2A side for the driven device 100 in the upper portion of the cylinder head 4, but the present invention can also be applied to the diesel engine 1 in which the DPF 40 is arranged on the end portion side of the upper portion of the cylinder head 4 near the output shaft portion 2A side.

(2) In the above embodiment, the first bracket 70 of the first support 61 and the second bracket 80 of the second support 62 are configured separately, but the first bracket 70 and the second bracket 80 are bent. It may be configured integrally by processing, welding, or the like.

(3) In the above-described embodiment, the second bracket 80 of the second support member 62 is laid across the first bracket 70 and the second mounting portion 66 of the intake collector 51. It may be constructed across the second attachment portion 66 of the intake collector 51 .

2 crankshaft 2A output shaft portion 4 cylinder head 6 intake manifold 7 exhaust manifold 40 DPF
51 intake collector 60 support mechanism 61 first support 62 second support 66 mounting portion (second mounting portion)
70 first bracket 80 second bracket 82 contact portion (horizontal plate portion)
84 bolts (5th bolt)
100 Device to be driven P1 First support position P2 Second support position P3 Third support position

Claims (3)

An engine in which a DPF for purifying exhaust gas from an exhaust manifold is disposed above a cylinder head,
an intake collector that recirculates part of the exhaust gas to the intake manifold as EGR gas is fixed to the intake manifold;
An engine provided with a support mechanism for supporting the DPF on the cylinder head, the intake manifold and the intake collector. 2. The engine according to claim 1 , wherein said support mechanism includes at least a first support for supporting said DPF on said cylinder head and said intake manifold, and a second support for supporting said DPF on said intake collector. The support mechanism has 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. is provided,
2. The engine according to claim 1 , wherein said third support position is arranged at a position offset from said first support position and said second support position in the direction of the rotation axis of the crankshaft.

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