JP2014136999A - Engine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine device capable of preventing an exhaust throttle device from being heated by radiation heat from surroundings of the exhaust throttle device even if the support structure of the exhaust throttle device can be configured to be highly rigid.SOLUTION: An engine device of the present invention includes an engine 1 including a device exhaust manifold 7, and uses an exhaust throttle device 65 to regulate an exhaust gas pressure of the exhaust manifold 7. An exhaust gas inlet of a throttle valve case 68 of the exhaust throttle device 65 is fastened to an exhaust outlet of the exhaust manifold 7, and an exhaust tube 72 is connected to the exhaust manifold 7 via the throttle valve case 68. A cooling water pipe of the exhaust throttle device 65 is provided halfway along a cooling pipe of an EGR cooler 29.

Description

  The present invention relates to an engine apparatus such as a diesel engine mounted on a work vehicle such as a skid steer loader or a backhoe or a forklift car, an agricultural machine such as a tractor or a combiner, a stationary generator or a refrigerator, and the like. The present invention relates to an engine device equipped with an exhaust throttle device for adjusting an exhaust gas pressure discharged from an exhaust manifold.

  Conventionally, an exhaust gas purification device (diesel particulate filter) has been installed in the exhaust path of the engine, and a technology for purifying exhaust gas discharged from the diesel engine by using an oxidation catalyst or soot filter of the exhaust gas purification device has been developed. (For example, refer to Patent Document 1).

  Conventionally, an exhaust throttle device is provided in the exhaust path of the engine to prevent the temperature of exhaust gas discharged to the exhaust gas purification device from being lowered, and the purification performance of the exhaust gas purification device is maintained.

JP 2010-185340 A

  Even when the exhaust gas purification device is assembled with being separated from the engine as in Patent Document 1, the temperature of the exhaust gas supplied from the engine to the exhaust gas purification device is maintained, soot filter of the exhaust gas purification device However, in the structure where the throttle valve case is connected to the exhaust manifold via a relay pipe, the exhaust gas intake side volume of the exhaust throttle device cannot be easily reduced, and the exhaust gas There is a problem that the extending direction of the exhaust pipe connecting the exhaust throttle device to the purification device is specified.

  Further, the exhaust throttle device includes an electrical component such as an actuator for operating the throttle valve, and this electrical component is easily affected by heat. Further, since the temperature of the exhaust gas passing through the exhaust manifold is extremely high, there is a problem that an abnormality occurs in the operation of the exhaust throttle device due to the influence of radiant heat or the like by the exhaust manifold.

  Accordingly, the present invention seeks to provide an engine device that has been improved by examining these current conditions.

  According to a first aspect of the present invention, there is provided an engine device including an engine having an exhaust manifold, wherein an exhaust pressure of the exhaust manifold is adjusted by an exhaust throttle device, and a throttle valve case of the exhaust throttle device is provided at an exhaust outlet of the exhaust manifold. The exhaust gas intake side is fastened, an exhaust pipe is connected to the exhaust manifold via the throttle valve case, and the cooling water pipe of the exhaust throttle device is provided in the middle of the engine cooling water pipe.

  According to a second aspect of the present invention, in the engine device according to the first aspect, a heat shield member that shields heat from the exhaust manifold is provided between the exhaust manifold and the exhaust throttle device.

  The invention of claim 3 is the engine device according to claim 2, wherein the heat shield member is a heat shield plate provided between the exhaust manifold and the exhaust throttle device, and the engine side of the heat shield plate. And a plate material connected to the upper part of the exhaust throttle device.

  The invention according to claim 4 is the engine device according to claim 2, wherein the heat shield member includes a heat shield plate provided between the exhaust manifold and the exhaust throttle device, and both side edges of the heat shield plate. It is constituted by two plate members that are more upright and connected to the upper part of the exhaust throttle device, and are supported by being suspended from the exhaust throttle device.

  A fifth aspect of the present invention is the engine device according to any one of the first to third aspects, further comprising a cooling water pump for circulating cooling water and an EGR cooler for cooling EGR gas, A cooling water pipe is provided in the middle of the cooling water pipe path connecting the cooling water pump and the EGR cooler.

  According to the first aspect of the present invention, in an engine device including an engine having an exhaust manifold and adjusting an exhaust pressure of the exhaust manifold by an exhaust throttle device, a throttle valve case of the exhaust throttle device is provided at an exhaust outlet of the exhaust manifold. The exhaust gas intake side is fastened, an exhaust pipe is connected to the exhaust manifold via the throttle valve case, and the cooling water pipe of the exhaust throttle device is provided in the middle of the engine cooling water pipe. Thus, the exhaust manifold and the exhaust throttle device can be installed compactly along one side of the engine, and the cooling water pipe connected to the exhaust throttle device can be compactly supported. Since the volume of the exhaust gas intake side of the exhaust throttle device can be reduced and the exhaust pressure in the exhaust manifold can be adjusted with high accuracy, for example, the temperature of the exhaust gas supplied to the exhaust gas purification device or the like can be used to purify the exhaust gas. Easy to maintain at a suitable temperature. Further, by using the outer surface of the exhaust manifold, for example, the temperature of the exhaust gas supplied to the exhaust gas purification device or the like can be easily maintained at a temperature suitable for purification of the exhaust gas.

  According to the second aspect of the present invention, since the heat shield member that shields the heat from the exhaust manifold is provided between the exhaust manifold and the exhaust throttle device, the inside of the exhaust gas is extremely hot. Radiation heat from the exhaust manifold flowing can be blocked. Therefore, in the exhaust throttle device, heating due to radiant heat from the exhaust manifold can be prevented, and the cooling effect by the cooling water can be maintained.

  According to the invention of claim 3, the heat shield member is erected from a heat shield plate provided between the exhaust manifold and the exhaust throttle device, and an end of the heat shield plate on the engine side. Since it is comprised by the board | plate material connected to the upper part of an exhaust throttle device, the radiant heat from an engine can be interrupted | blocked. Therefore, in the exhaust throttle device, heating due to radiant heat from the engine can be prevented, and the cooling effect by the cooling water can be maintained.

  According to a fourth aspect of the present invention, the heat shield member includes a heat shield plate provided between the exhaust manifold and the exhaust throttle device, and the exhaust throttle device provided upright from both side edges of the heat shield plate. It is comprised by the 2 board | plate material connected to the upper part of this, and it is suspended and supported by the said exhaust throttle device, Therefore The relative position with respect to the said exhaust throttle device of the said heat-shielding member can be fixed. Thereby, a space is formed between the heat shield member and the exhaust throttle device, and due to the heat insulating effect, it is possible to prevent the cooling effect from being reduced by the cooling water in the exhaust throttle device.

  According to the invention of claim 5, a cooling water pump for cooling water circulation and an EGR cooler for cooling EGR gas are provided, and a cooling water pipe of the exhaust throttle device connects the cooling water pump and the EGR cooler. Since it is provided in the middle of the cooling water piping route, the exhaust manifold, the exhaust throttle device, and the EGR cooler can be installed compactly along one side of the engine, for example, the exhaust The exhaust pipe can be extended sideways or upward from the throttle valve gas outlet of the throttle valve case in accordance with the arrangement of the gas purification device. Further, the cooling water pipe connected to the exhaust throttle device and the EGR cooler can be compactly supported by using the outer surface of the exhaust manifold.

It is a perspective view of the diesel engine which shows a 1st embodiment. It is a front view of a diesel engine. It is the same rear view. It is the same right view. It is the left side view. It is the same top view. It is the perspective view seen from the left side. It is the perspective view seen from the left side of an exhaust manifold part. It is the perspective view seen from the upper side of an exhaust manifold part. It is a perspective view of cooling water piping. 1 is an external perspective view of an exhaust gas purification device. It is a disassembled perspective view of an exhaust throttle device. It is a longitudinal cross-sectional view of an exhaust throttle device. It is a cross-sectional view of an exhaust throttle device. It is a longitudinal cross-sectional view of a diesel engine. FIG. 16 is an enlarged cross-sectional view around the exhaust throttle device in FIG. 15. It is a top view around an exhaust throttle device. It is a side view of a forklift car. It is a top view of a forklift car. It is a side view of a skid steer loader. It is a top view of a skid steer loader.

  Hereinafter, an engine device according to an embodiment of the present invention will be described with reference to FIGS. A diesel engine 1 mounted as a prime mover on a construction machine, a civil engineering machine, an agricultural machine, or a cargo handling machine is provided with a continuously regenerative exhaust gas purification device 2 (diesel particulate filter). The exhaust gas purification device 2 reduces carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of the diesel engine 1 in addition to removing particulate matter (PM) in the exhaust gas of the diesel engine 1. It is configured.

  The diesel engine 1 includes a cylinder block 4 that incorporates an engine output crankshaft 3 and a piston (not shown). A cylinder head 5 is mounted on the cylinder block 4. An intake manifold 6 is disposed on the right side surface of the cylinder head 5. An exhaust manifold 7 is disposed on the left side surface of the cylinder head 5. A head cover 8 is disposed on the upper side surface of the cylinder head 5. A cooling fan 9 is provided on the front side surface of the cylinder block 4. A flywheel housing 10 is provided on the rear side of the cylinder block 4. A flywheel 11 is disposed in the flywheel housing 10.

  The flywheel 11 is pivotally supported on the crankshaft 3 (engine output shaft). The power of the diesel engine 1 is taken out via the crankshaft 3 to the working part of a work vehicle (backhoe, forklift, etc.). An oil pan 12 is disposed on the lower surface of the cylinder block 4. Lubricating oil in the oil pan 12 is supplied to each lubricating portion of the diesel engine 1 through an oil filter 13 disposed on the side surface of the cylinder block 4.

  A fuel supply pump 14 for supplying fuel is attached to the side of the cylinder block 4 above the oil filter 13 (below the intake manifold 6). The diesel engine 1 is provided with injectors 15 for four cylinders each having an electromagnetic opening / closing control type fuel injection valve (not shown). A fuel tank (not shown) mounted on the work vehicle is connected to each injector 15 via a fuel supply pump 14, a cylindrical common rail 16 and a fuel filter 17.

  The fuel in the fuel tank is pumped from the fuel supply pump 14 to the common rail 16 via the fuel filter 17, and high-pressure fuel is stored in the common rail 16. By controlling the fuel injection valves of the injectors 15 to open and close, the high-pressure fuel in the common rail 16 is injected from the injectors 15 into the cylinders of the diesel engine 1.

  A cooling water pump 21 for circulating cooling water is disposed coaxially with the fan shaft of the cooling fan 9 at a portion on the left side of the front surface of the cylinder block 4. The rotation of the crankshaft 3 drives the cooling water pump 21 together with the cooling fan 9 via the cooling fan driving V-belt 22. Cooling water in a radiator (not shown) mounted on the work vehicle is supplied to the cooling water pump 21 by driving the cooling water pump 21. Then, cooling water is supplied to the cylinder block 4 and the cylinder head 5 to cool the diesel engine 1. An alternator 23 is provided on the left side of the cooling water pump 21.

  Engine leg mounting portions 24 are respectively provided on the left and right side surfaces of the cylinder block 4. Each engine leg mounting portion 24 is bolted to an engine leg (not shown) having vibration-proof rubber. The diesel engine 1 is supported in an anti-vibration manner on a work vehicle (an engine mounting chassis such as a backhoe or a forklift car) through the engine legs.

  Further, the EGR device 26 (exhaust gas recirculation device) will be described. An air cleaner (not shown) is connected to an inlet portion of the intake manifold 6 protruding upward via an EGR device 26 (exhaust gas recirculation device). Fresh air (external air) is sent from the air cleaner to the intake manifold 6 via the EGR device 26.

  The EGR device 26 mixes a part of the exhaust gas of the diesel engine (EGR gas from the exhaust manifold) and fresh air (external air from the air cleaner) and supplies it to the intake manifold 6 and an EGR main body case 27 (collector). An intake throttle member 28 for communicating the EGR main body case 27 with the air cleaner, a recirculation exhaust gas pipe 30 as a reflux pipe connected to the exhaust manifold 7 via an EGR cooler 29, and a recirculation exhaust gas pipe 30 The EGR main body case 27 is communicated with an EGR valve member 31.

  That is, the intake manifold 6 and the intake air intake throttle member 28 for introducing fresh air are connected via the EGR main body case 27. The EGR main body case 27 communicates with the outlet side of the recirculated exhaust gas pipe 30 extending from the exhaust manifold 7. The EGR main body case 27 is formed in a long cylindrical shape. The intake throttle member 28 is bolted to one end of the EGR main body case 27 in the longitudinal direction. A downward opening end portion of the EGR main body case 27 is detachably bolted to an inlet portion of the intake manifold 6.

  Further, the outlet side of the recirculation exhaust gas pipe 30 is connected to the EGR main body case 27 via the EGR valve member 31. The inlet side of the recirculated exhaust gas pipe 30 is connected to the lower surface side of the exhaust manifold 7 via the EGR cooler 29. The amount of EGR gas supplied to the EGR main body case 27 is adjusted by adjusting the opening degree of an EGR valve (not shown) in the EGR valve member 31.

  With the above configuration, fresh air (external air) is supplied from the air cleaner through the intake throttle member 28 into the EGR main body case 27, while EGR is supplied from the exhaust manifold 7 through the EGR valve member 31 into the EGR main body case 27. Gas (a part of the exhaust gas discharged from the exhaust manifold) is supplied. After fresh air from the air cleaner and EGR gas from the exhaust manifold 7 are mixed in the EGR main body case 27, the mixed gas in the EGR main body case 27 is supplied to the intake manifold 6. That is, a 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 at the time of high load operation is lowered. NOx (nitrogen oxide) emissions are reduced.

  Next, the exhaust gas purification device 2 will be described with reference to FIGS. 1 and 11. The exhaust gas purification device 2 includes an exhaust gas purification case 38 having a purification inlet pipe 36 and a purification outlet pipe 37. Inside the exhaust gas purification case 38, a diesel oxidation catalyst 39 (gas purification body) such as platinum that generates nitrogen dioxide (NO2) and the collected particulate matter (PM) are continuously oxidized and removed at a relatively low temperature. The soot filter 40 (gas purifier) having a honeycomb structure is arranged in series in the exhaust gas moving direction (from the lower side to the upper side in FIG. 1). Note that one side of the exhaust gas purification case 38 is formed by a silencer 41, and the silencer 41 is provided with a purification outlet pipe 37 connected to the tail pipe 135.

  With the above configuration, nitrogen dioxide (NO 2) generated by the oxidation action of the diesel oxidation catalyst 39 is supplied into the soot filter 40 from one end face (intake end face). Particulate matter (PM) contained in the exhaust gas of the diesel engine 1 is collected by the soot filter 40 and continuously oxidized and removed by nitrogen dioxide (NO2). In addition to the removal of particulate matter (PM) in the exhaust gas of the diesel engine 1, the content of carbon monoxide (CO) and hydrocarbon (HC) in the exhaust gas of the diesel engine 1 is reduced.

  Further, a thermistor-type upstream gas temperature sensor 42 and a downstream gas temperature sensor 43 are attached to the exhaust gas purification case 38. The exhaust gas temperature at the gas inflow side end face of the diesel oxidation catalyst 39 is detected by the upstream gas temperature sensor 42. The exhaust gas temperature at the gas outflow side end face of the diesel oxidation catalyst is detected by the downstream gas temperature sensor 43.

  Further, a differential pressure sensor 44 as an exhaust gas pressure sensor is attached to the exhaust gas purification case 38. A pressure difference of the exhaust gas between the upstream side and the downstream side of the soot filter 40 is detected by a differential pressure sensor 44. Based on the exhaust pressure difference between the upstream side and the downstream side of the soot filter 40, the accumulation amount of particulate matter in the soot filter 40 is calculated, and the clogged state in the soot filter 40 can be grasped.

  As shown in FIGS. 1 and 11, the sensor bracket 46 is bolted to the outlet pinching flange 45 of the exhaust gas purification case 38, and the sensor bracket 46 is disposed on the outer surface side of the exhaust gas purification case 38. A differential pressure sensor 44 integrally provided with an electrical wiring connector is attached to the sensor bracket 46. A differential pressure sensor 44 is disposed on the outer surface of the exhaust gas purification case 38. One end side of the upstream sensor pipe 47 and the downstream sensor pipe 48 is connected to the differential pressure sensor 44. The upstream and downstream sensor piping boss bodies 49 and 50 are arranged in the exhaust gas purification case 38 so as to sandwich the soot filter 40 in the exhaust gas purification case 38. The other end sides of the upstream sensor pipe 47 and the downstream sensor pipe 48 are connected to the sensor pipe boss bodies 49 and 50, respectively.

  With the above configuration, a difference between the exhaust gas pressure on the inflow side of the soot filter 40 and the exhaust gas pressure on the outflow side of the soot filter 40 (exhaust gas differential pressure) is detected via the differential pressure sensor 44. Since the residual amount of particulate matter in the exhaust gas collected by the soot filter 40 is proportional to the differential pressure of the exhaust gas, the difference occurs when the amount of particulate matter remaining in the soot filter 40 increases more than a predetermined amount. Based on the detection result of the pressure sensor 44, regeneration control (for example, control for increasing the exhaust temperature) for reducing the amount of particulate matter in the soot filter 40 is executed. When the residual amount of the particulate matter further increases beyond the regeneration controllable range, the maintenance work for removing the particulate matter artificially by removing and disassembling the exhaust gas purification case 38, cleaning the soot filter 40, and so on. Is done.

  The electrical wiring connector 51 is integrally provided on the outer case portion of the differential pressure sensor 44, and the electrical wiring connector 52 of the upstream gas temperature sensor 42 and the electrical wiring connector 53 of the downstream gas temperature sensor 43 are connected to the sensor bracket. It adheres to 46. Each of the electrical wiring connectors 51 of the differential pressure sensor 44, the electrical wiring connector 52 of the upstream gas temperature sensor 42, and the electrical wiring connector 53 of the downstream gas temperature sensor 43 are arranged in the posture in which the respective connection directions are directed in the same direction. Since the connectors 51, 52 and 53 are supported, the connection workability of the connectors 51, 52 and 53 can be improved.

  In addition, a suspended body 55 is integrally formed on the outlet holding flange 45 of the exhaust gas purification case 38, and a hanging metal fitting 56 is provided on a side surface of the exhaust gas purification case 38 provided with the purification inlet pipe 36 on the side of the exhaust gas inlet. Fasten the bolts. In the diagonal direction of the exhaust gas purification case 38, the suspension body 55 and the suspension fitting 56 are arranged apart from each other. In an assembly plant of the diesel engine 1 or the like, the suspension body 55 and the suspension fitting 56 are locked to a hook (not shown) such as a chain block, and the exhaust gas purification case 38 is suspended and supported by the chain block or the like. An exhaust gas purification case 38 is assembled to the engine 1. Due to the diagonal arrangement of the suspension body 55 and the suspension fitting 56, the exhaust gas purification case 38, which is a heavy object, can be suspended in a stable posture.

  Next, as shown in FIGS. 1 and 8 to 10, an EGR gas extraction pipe 61 is integrally formed in the exhaust manifold 7. Further, the pipe joint member 62 is bolted to the exhaust manifold 7. By supporting the EGR gas inlet portion of the EGR cooler 29 with the EGR gas take-out pipe 61 and supporting the EGR gas outlet portion of the EGR cooler 29 with the pipe joint member 62 connecting the recirculation exhaust gas pipe 30, The EGR cooler 29 is disposed away from the cylinder block 4 (specifically, the left side surface).

  On the other hand, as shown in FIGS. 1, 8, and 12 to 17, an exhaust throttle device 65 that increases the exhaust pressure of the diesel engine 1 is provided. An exhaust outlet body 7a of the exhaust manifold 7 is opened upward. An exhaust outlet body 7 a of the exhaust manifold 7 is detachably connected to an elbow-shaped relay pipe 66 via an exhaust throttle device 65 for adjusting the exhaust pressure of the diesel engine 1. The exhaust throttle device 65 includes a throttle valve case 68 containing the exhaust 3, an actuator case 69 containing a power transmission mechanism from a motor (actuator) 63 that controls the opening of the exhaust throttle valve 67, and an actuator in the throttle valve case 68. A water cooling case 70 for connecting the case 69 is provided. By the power transmission mechanism, the motor 63 is configured such that its rotation shaft can be interlocked with the rotation shaft 67a of the exhaust throttle valve 67 in the throttle valve case by a gear or the like.

  A throttle valve case 68 is mounted on the exhaust outlet body 7a, a relay pipe 66 is mounted on the throttle valve case 68, and the relay pipe 66 is fastened to the exhaust outlet body 7a via the throttle valve case 68 by four bolts 71. . The lower surface side of the throttle valve case 68 is fixed to the exhaust outlet body 7a. A lower surface side opening 66 a of the relay pipe 66 is fixed to the upper surface side of the throttle valve case 68. A lateral opening 66 b of the relay pipe 66 is connected to the purification inlet pipe 36 via the exhaust pipe 72. Accordingly, the exhaust manifold 7 is connected to the above-described exhaust gas purification device 2 via the relay pipe 66 and the exhaust throttle device 65. Exhaust gas that has moved from the outlet of the exhaust manifold 7 into the exhaust gas purification device 2 via the purification inlet pipe 36 is purified by the exhaust gas purification device 2 and then from the purification outlet pipe 37 to a tail pipe (not shown). ) And will eventually be discharged out of the machine.

  With the above configuration, the regeneration control of the soot filter 40 is executed by operating the motor 63 of the exhaust throttle device 65 based on the pressure difference detected by the differential pressure sensor 44. That is, when soot accumulates on the soot filter 40, the exhaust pressure of the diesel engine 1 is increased by controlling the exhaust throttle valve 67 of the exhaust throttle device 65 to close, so that the exhaust is discharged from the diesel engine 1. The exhaust gas temperature is increased to a high temperature, and the soot accumulated on the soot filter 40 is burned. As a result, the soot disappears and the soot filter 40 is regenerated.

  In addition, even if the work with a small load and the temperature of the exhaust gas is likely to be low (the work in which soot is likely to accumulate) is continuously performed, the soot filter 40 can be regenerated by forcibly increasing the exhaust pressure by the exhaust throttle device 65, The exhaust gas purification capacity of the gas purification device 2 can be properly maintained. Further, a burner or the like for burning the soot deposited on the soot filter 40 becomes unnecessary. In addition, when the engine 1 is started, the exhaust pressure of the diesel engine 1 is increased by controlling the exhaust throttle device 65, thereby increasing the temperature of the exhaust gas from the diesel engine 1 and promoting the warm-up of the diesel engine 1. it can.

  As shown in FIGS. 1, 8, and 12 to 17, in an engine device that includes an engine 1 having an exhaust manifold 7 and adjusts an exhaust pressure of the exhaust manifold 7 with an exhaust throttle device 65, an exhaust outlet of the exhaust manifold 7 is used. In addition, the exhaust gas intake side of the throttle valve case 68 of the exhaust throttle device 65 is fastened, and the exhaust pipe 72 is connected to the exhaust manifold 7 via the throttle valve case 68. Accordingly, the exhaust throttle device 65 can be supported by the highly rigid exhaust manifold 7 and the support structure of the exhaust throttle device 65 can be configured with high rigidity. For example, the throttle valve case is connected to the exhaust manifold 7 via the relay pipe 66. Compared with the structure connecting 68, the exhaust gas intake side volume of the exhaust throttle device 65 can be reduced, and the exhaust pressure in the exhaust manifold 7 can be adjusted with high accuracy. For example, the temperature of the exhaust gas supplied to the exhaust gas purification device 2 can be easily maintained at a temperature suitable for exhaust gas purification.

  As shown in FIGS. 8 and 12 to 17, a throttle valve case 68 is fastened to the upper surface side of the exhaust manifold 7, and a relay pipe 66 is fastened to the upper surface side of the throttle valve case 68. The case 68 and the relay pipe 66 are arranged in multiple layers, and the exhaust pipe 72 is connected to the relay pipe 66 in the uppermost layer. Therefore, without changing the support posture of the exhaust throttle device 65 and without changing the specifications of the relay pipe 66, for example, according to the mounting position of the exhaust gas purification device 2, the mounting posture of the relay pipe 66 (exhaust pipe 72). Can be changed.

  As shown in FIGS. 1, 8, and 12 to 17, an exhaust outlet of the exhaust manifold 7 is opened upward, a throttle valve case 68 is provided on the upper surface side of the exhaust manifold 7, and a throttle is formed on the upper surface side of the throttle valve case 68. A valve gas outlet 68a is formed, and an EGR cooler 29 for cooling the EGR gas is disposed below the throttle valve case 68 with the exhaust manifold 7 interposed therebetween. Accordingly, the exhaust manifold 7, the exhaust throttle device 65, and the EGR cooler 29 can be installed compactly along one side of the engine 1, for example, corresponding to the arrangement of the exhaust gas purification device 2, etc. From the throttle valve gas outlet 68a of the throttle valve case 68, the exhaust pipe 72 can be extended sideways or upward. Therefore, the exhaust gas purification device 2 can be functionally supported inside and outside the engine room of the work vehicle (components other than the diesel engine 1). Further, the cooling water pipes (throttle outlet side pipe 77, throttle inlet side pipe 78, etc.) connected to the exhaust throttle device 65 and the EGR cooler 29 can be compactly supported using the outer surface of the exhaust manifold 7.

  On the other hand, on the left side of the diesel engine 1 (exhaust manifold 7 side), a cooling water piping path (flexible cooling water return hose 75, throttle outlet side pipe) connecting the cooling water pump 21 to the EGR cooler 29 and the exhaust throttle device 65. 77, a throttle inlet side pipe 78, a cooling water take-out hose 79, etc.). The cooling water from the cooling water pump 21 is not only supplied to the water cooling part of the diesel engine 1 but also a part thereof is sent to the EGR cooler 29 and the exhaust throttle device 65.

  One end side of the alloy intermediate pipe 76 is connected to the return hose 75, and one end side of the alloy throttle outlet side pipe 77 is connected to the other end side of the alloy intermediate pipe 76 via a flexible hose 76a. The other end of the throttle outlet side pipe 77 is connected to the water cooling case 70 of the exhaust throttle device 65 via a flexible hose 77a, and one end side of the alloy throttle inlet side pipe 78 is connected to the water cooling case 70. The other end side of the throttle inlet side pipe 78 is connected to the cooling water discharge port of the EGR cooler 29 via a flexible hose 78b. A cooling water intake port of the EGR cooler 29 is connected to the cylinder block 4 via a cooling water extraction hose 79.

  That is, the EGR cooler 29 and the exhaust throttle device 65 are connected to the cooling water pump 21 in series. In the cooling water flow path formed by the hoses 75, 76 a, 77 a, 78 a, 78 b, 79 and the pipes 76 to 78, the exhaust throttle device 65 is provided between the cooling water pump 21 and the EGR cooler 29. Is placed. An exhaust throttle device 65 is located upstream of the EGR cooler 29. A part of the cooling water from the cooling water pump 21 is supplied from the cylinder block 4 to the exhaust throttle device 65 via the EGR cooler 29 and circulates.

  Thus, the exhaust throttle device 65 to which a part of the cooling water is supplied is supplied with the cooling water from the throttle outlet side pipe 77 and discharges the cooling water to the throttle inlet side pipe 78. Therefore, the water supply position and the water discharge position of the cooling water to the water cooling case 70 are opposite to the intake position and the exhaust position of the exhaust gas flowing through the throttle valve case 68. That is, the water supply position of the cooling water in the water cooling case 70 is on the upper side compared to the drainage position, so that the reverse flow of the cooling water flowing in the water cooling case 70 can be more reliably prevented.

  In order to further ensure the cooling effect of the water cooling case 70 in the exhaust throttle device 65, a heat shield member 90 is provided so as to surround the exhaust throttle device 65. The heat shield member 90 is configured by bending a metal plate so that the front and rear surfaces are open, and covers the left and right and lower sides of the exhaust throttle device 65. That is, the heat shield member 90 includes a heat shield plate 91 positioned between the exhaust manifold 7, the actuator case 69 and the water cooling case 70, and a metal plate material 92 erected vertically from the left and right edges of the heat shield plate 91. , 93.

  At this time, the heat shield plate 91 is installed on the lower side of the exhaust throttle device 65 at a position having gaps S1 and S2 with the exhaust manifold 7 and the exhaust throttle device 65, respectively, and shields radiant heat from the exhaust manifold 7. Further, the metal plate member 92 located on the right side of the heat shield plate 91 is installed at a position having the gaps S3 and S4 with the head cover 8 and the exhaust throttle device 65, respectively, and shields the radiant heat from the diesel engine 1 main body. On the other hand, the metal plate material 93 located on the left side of the heat shield plate 91 is installed at a position having the exhaust throttle device 65 and the gap S5.

  The metal plates 92 and 93 each have a connection portion for support that is bent into an L shape at the end opposite to the connection portion with the heat shield plate 91 and is in contact with the upper side surface of the water cooling case 70. 92a, 93a. As a result, the support connection portions 92 a and 93 a are screwed to the water cooling case 70 by the screws 94, so that the heat shield member 90 is suspended and supported by the exhaust throttle device 65.

  The heat shield member 90 configured as described above is installed in a non-contact manner with the exhaust manifold 7 and the head cover 8, and a space is provided on the exhaust manifold 7 and head cover 8 side of the exhaust throttle device 65. Therefore, in the exhaust throttle device 65, the radiant heat from the surroundings is blocked by the heat shield member 90, and the cooling effect by the cooling water passing through the water cooling case 70 can be enhanced.

  A structure in which the diesel engine 70 is mounted on the forklift car 120 will be described with reference to FIGS. 18 and 19. As shown in FIGS. 18 and 19, the forklift car 120 includes a traveling machine body 124 having a pair of left and right front wheels 122 and a rear wheel 123. The traveling body 124 is equipped with a control unit 125 and a diesel engine 70. A working portion 127 having a fork 126 for cargo handling work is provided on the front side portion of the traveling machine body 124. The control unit 125 is provided with a control seat 128 on which an operator is seated, a control handle 129, operation means for performing output operation of the diesel engine 1, etc., a lever or switch as an operation means for the working unit 127, and the like. .

  A fork 126 is arranged on the mast 130 that is a component of the working unit 127 so as to be movable up and down. The fork 126 is moved up and down, a pallet (not shown) loaded with a load is placed on the fork 126, the traveling machine body 124 is moved forward and backward, and a cargo handling operation such as transportation of the pallet is performed. Yes.

  In the forklift car 120, the diesel engine 1 is disposed below the control seat 128, and the exhaust gas purification device 2 is disposed behind the control seat 128. Therefore, the exhaust pipe 72 that connects the diesel engine 1 and the exhaust gas purification device 2 extends rearward from the lower side of the control seat 128, and the exhaust gas purification device 2 is remotely arranged with respect to the diesel engine 1. The Further, the tail pipe 135 connected to the exhaust gas purification device 2 is configured to extend upward from the exhaust gas purification device 2 on the rear side of the control seat 128. As a result, the exhaust gas discharged from the exhaust gas purification device 2 passes through the tail pipe 135 and is discharged to the upper rear side of the control seat 128.

  The diesel engine 1 is arranged such that the flywheel housing 10 is located on the front side of the traveling machine body 124. That is, the diesel engine 1 is arranged such that the direction of the engine output shaft 74 is along the front-rear direction in which the working unit 127 and the counterweight 131 are aligned. A mission case 132 is connected to the front side of the flywheel housing 10. Power from the diesel engine 1 via the flywheel 10 is appropriately shifted in the transmission case 132 and transmitted to the hydraulic drive source 133 of the front wheel 122, the rear wheel 123, and the fork 126.

  Next, a structure in which the diesel engine 1 is mounted on the forklift car 211 will be described with reference to FIGS. The skid steer loader 211 shown in FIGS. 20 and 21 includes a traveling machine body 216 having a pair of left and right front wheels 213 and a rear wheel 214, similar to the forklift car 120. The traveling body 216 is equipped with a control unit 217 and a diesel engine 1. A loader device 212 as a working unit is attached to the front side portion of the traveling machine body 216 so that the loader work can be performed. In the control unit 125, a control seat 219 on which an operator is seated, a control handle 218, operation means for performing output operation of the diesel engine 1 and the like, a lever or a switch as an operation means for the loader device 212, and the like are disposed. .

  As described above, the loader device 212 serving as a working unit is provided at the front portion of the skid steer loader 211 and above the front wheel 213. The loader device 212 includes loader posts 222 disposed on the left and right sides of the traveling machine body 216, a pair of left and right lift arms 223 connected to the upper ends of the loader posts 222 so as to swing up and down, and tip portions of the left and right lift arms 223. And a bucket 224 connected to be vertically swingable.

  Between each loader post 222 and the corresponding lift arm 223, a lift cylinder 226 for vertically swinging the lift arm 223 is provided. A bucket cylinder 228 for swinging the bucket 224 up and down is provided between the left and right lift arms 223 and the bucket 224. In this case, when the operator of the control seat 219 operates a loader lever (not shown), the lift cylinder 226 and the bucket cylinder 228 are expanded and contracted to swing the lift arm 223 and the bucket 224 up and down to execute the loader operation. It is configured as follows.

  Also in the skid steer loader 211, the diesel engine 1 is disposed below the control seat 219 and the exhaust gas purification device 2 is disposed behind the control seat 219, as with the forklift car 120. Accordingly, the exhaust pipe 72 that connects the diesel engine 1 and the exhaust gas purification device 2 extends rearward from the lower side of the control seat 219, and the exhaust gas purification device 2 is remotely located with respect to the diesel engine 1. The Further, the tail pipe 135 connected to the exhaust gas purification device 2 is configured to extend upward from the exhaust gas purification device 2 on the rear side of the control seat 219. As a result, the exhaust gas discharged from the exhaust gas purification device 2 passes through the tail pipe 135 and is discharged to the upper rear side of the control seat 219.

  In addition, this invention is not limited to the above-mentioned embodiment, It can be embodied in various aspects. For example, the engine device according to the present invention is not limited to the forklift car 120 and the skid steer loader 211 as described above, but is applicable to various work vehicles such as agricultural machines such as combine and tractors and special work vehicles such as crane cars. Widely applicable. Moreover, the structure of each part in this invention is not limited to embodiment of illustration, A various change is possible in the range which does not deviate from the meaning of this invention.

1 diesel engine 7 exhaust manifold 65 exhaust throttle device 66 relay pipe 68 throttle valve case 70 water cooling case 77 throttle outlet side pipe 78 throttle inlet side pipe 90 heat shield member 91 heat shield plate

Claims (5)

In an engine device comprising an engine having an exhaust manifold and adjusting an exhaust pressure of the exhaust manifold with an exhaust throttle device,
The exhaust gas intake side of the throttle valve case of the exhaust throttle device is fastened to the exhaust outlet of the exhaust manifold, and an exhaust pipe is connected to the exhaust manifold through the throttle valve case,
An engine apparatus characterized in that a cooling water pipe of the exhaust throttle device is provided in the middle of an engine cooling water pipe path. A heat shield member that shields heat from the exhaust manifold is provided between the exhaust manifold and the exhaust throttle device.
The engine device according to claim 1. The heat shield member is connected to the heat shield plate provided between the exhaust manifold and the exhaust throttle device, and the upper side of the exhaust throttle device standing from the engine side end of the heat shield plate. It is characterized by comprising a plate material,
The engine device according to claim 2. The heat shield member includes a heat shield plate provided between the exhaust manifold and the exhaust throttle device, and two sheets connected to the upper portion of the exhaust throttle device by being erected from both side edges of the heat shield plate And is supported by being suspended by the exhaust throttle device,
The engine device according to claim 2. A cooling water pump for circulating cooling water and an EGR cooler for cooling EGR gas,
The cooling water pipe of the exhaust throttle device is provided in the middle of a cooling water pipe path connecting the cooling water pump and the EGR cooler.
The engine apparatus as described in any one of Claims 1-3.

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