JP2010096014A - Cooling device for working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device for a working machine capable of preventing the deterioration of the cooling efficiency of a coolant cooled by an aftercooler, preventing the connecting state of piping connected to the aftercooler from becoming defective even if affected by the vibration of an engine, and efficiently utilizing the waste hot air after cooling the aftercooler to cool the outer peripheral surface of a waste gas post-treatment device. <P>SOLUTION: An engine room and a cooling passage are configured in parallel in the longitudinal direction of the working machine, and a bulkhead demarcating the engine room and a cooling passage is disposed between them. The aftercooler and the waste gas post-treatment device are disposed in the cooling passage, and the outer peripheral surface of the waste gas post-treatment device is cooled by the waste hot air that has cooled the aftercooler. The aftercooler is arranged at the side of a position where the engine is disposed. Thus, the length of a pair of intake pipes connected to the aftercooler disposed in the cooling passage separate from the engine room can be shortened, and the length of the same pair of intake pipes disposed in the engine room can be made short. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a cooling device for a work machine, and more particularly to an arrangement configuration of a radiator, an engine, an aftercooler, and an exhaust gas aftertreatment device used in the work machine.
In the present invention, the forward / backward direction in the side view of the work machine is the front / rear direction, and the left / right direction in the front view of the work machine is the vehicle width direction.

  As a work machine, for example, in a dump truck, when installing a cooling device such as a radiator or an aftercooler, the cooling device is actively used as a cold air. It is a general arrangement configuration.

  Moreover, since the cooling fan that cools these cooling devices is often connected directly to the engine, these cooling devices are arranged in a limited space on the front side of the engine. Therefore, an arrangement configuration in which the respective cooling members in the radiator, the aftercooler, and the like are overlapped is adopted.

  In the case of the arrangement configuration in which the cooling members are overlapped in this way, the cooling member disposed on the rear side in the overlapped cooling member is the waste hot air preheated by the cooling member disposed on the front side. Will win. For this reason, the cooling efficiency of the cooling member disposed on the rear side is deteriorated.

  This problem can be solved by configuring the pressure receiving area of the cooling member to which the waste hot air hits in the cooling device arranged on the rear side or by increasing the air volume of the cooling fan of the cooling device arranged on the front side. Can do. However, if the pressure receiving area of the cooling member is increased or the air volume of the cooling fan is increased, the size of the cooling device itself arranged on the rear side is increased, or the cooling fan is increased. I will keep it.

  In addition, a new problem arises due to a lack of installation space necessary for disposing a large-sized cooling device or cooling fan or interference with other devices. In particular, when the heat rejection of the engine is improved, it is difficult to cope with the layout configuration described above.

  Therefore, in order to solve such a problem, a cooling device for a hydraulic excavator (see Patent Document 1) in which a cooling aftercooler is provided in a portion different from an engine room in which a radiator is provided is disclosed by the present applicant. Proposed.

  FIG. 4 shows a plan view of the cooling device in Patent Document 1 as a prior art in the present invention. As shown in FIG. 4, the upper revolving structure 50 of the large hydraulic excavator is configured with an engine room 51 disposed sideways with respect to the traveling direction of the large hydraulic excavator. An engine 52 is disposed horizontally in the engine room 51.

  A radiator 55 and a hydraulic oil cooler 54 are arranged in series in front of the cooling fan 53 directly connected to the engine 52, and an air cleaner 57 is arranged above the engine 52. The air cleaner 57 is connected to a turbocharger 56 via an air pipe 60, and the turbocharger 56 is connected to an air-cooling aftercooler 58 via an air pipe 59. The air cooling after cooler 58 is connected to the engine 52 via the air pipe 61.

The air-cooled after cooler 58 is separately provided outside the engine room 51, and is disposed at a position approximately lined up on the side of the radiator 55 so as to be close to the side wall of the large hydraulic excavator. Yes.
JP-A-9-125972

  In the cooling device described in Patent Document 1, the air cooling after cooler 58 is disposed at a position close to the side wall of the large hydraulic excavator in order to easily introduce outside air into the air cooling after cooler 58. ing. Therefore, the air-cooling aftercooler 58 is disposed in a side portion away from the engine portion in the vehicle width direction of the large hydraulic excavator.

  Since it is configured in this manner, the length of the air pipe 59 that connects the air-cooled aftercooler 58 and the turbocharger 56 and the length of the air pipe 61 that connects the air-cooled aftercooler 58 and the engine 52 are configured to be longer. Has been. In addition, in the engine room 51, the air pipe 59 and the air pipe 61 are long.

  In particular, since the air piping 61 that flows the cool air cooled in the air cooling after cooler 58 is long in the engine room 51, the cold air flowing in the air piping 61 is heated by the warm air in the engine room 51. become. For this reason, even if cooling is performed in the air-cooling aftercooler 58, the cooling effect in the subsequent air piping 61 is reduced.

  In addition, in the front-rear direction of the large-sized hydraulic excavator, the air-cooling aftercooler 58 and the engine 52 are separated from each other in the front-rear direction. Therefore, when a torsional force or vibration occurs in the body frame or the like due to the impact or vibration associated with the operation of the hydraulic excavator, the torsion or vibration at the engine 52 installation site and the air cooling aftercooler 58 installation site. The twisting and shaking in the case are different twisting and shaking states.

  The air-cooled aftercooler 58 and the engine 52 perform different motions due to the influence of impact and vibration associated with the operation of the hydraulic excavator. For this reason, an unreasonable force is applied to the joint portions of the air pipe 59 and the air pipe 61, and there is a possibility that the connected state at the joint portion may be out of order. In order to eliminate this fear, the air pipe 59 and the air pipe 61 should be supported using special support means so that different motions in the air-cooled aftercooler 58 and the engine 52 can be absorbed. Will have to.

  Furthermore, in a work machine that mainly travels like a dump truck, it is necessary to travel under various roadbed conditions. When only one of the left and right wheels gets over an obstacle during traveling, a torsional force or a shaking force that cannot occur with a hydraulic excavator is generated. Further, depending on the relationship between the location where the engine 52 is disposed and the location where the cooling aftercooler 58 is disposed, the force applied to the joints in the air pipe 59 and the air pipe 61 also increases.

  The present invention has been made to solve the above-described problems, and can prevent the cooling efficiency of the refrigerant cooled by the aftercooler from being lowered, and can also be influenced by the impact and vibration associated with the operation of the work machine. Even if it is received, it is possible to prevent the connection state of the pipe connected to the aftercooler from being deteriorated, and furthermore, the waste hot air after cooling the aftercooler can be used efficiently, An object of the present invention is to provide a work machine cooling apparatus capable of cooling a processing apparatus.

In order to achieve the above-mentioned object, the present invention provides a cooling device for a work machine comprising a radiator that cools engine cooling water and an aftercooler that cools air that has been supercharged by a supercharger.
An engine room for storing the engine is configured in the front-rear direction of the work machine. In the engine room, the radiator, a cooling fan for cooling the radiator, and the engine are arranged in this order in the front-rear direction of the work machine. Arranged along the
A cooling passage configured in the front-rear direction of the work machine and arranged in parallel with the engine room is defined as the engine room with a partition wall therebetween,
In the cooling passage, an aftercooler, an aftercooler cooling fan that cools the aftercooler, and an exhaust gas aftertreatment device are arranged in this order along the front-rear direction of the work machine, and the aftercooler The most important feature is that the engine is arranged side by side next to the installation position of the engine.

  In the present invention, the supercharger disposed in the engine room and the connection ports in the engine to which a pair of pipes connected to the aftercooler are respectively connected are arranged near the partition wall. The main feature is being made.

  In the present invention, the cooling passage defined by the engine room with the partition wall therebetween is configured in parallel with the engine room. In the cooling passage, the aftercooler, the aftercooler cooling fan for cooling the aftercooler, and the exhaust gas aftertreatment device are arranged in this order along the front-rear direction of the work machine. .

  By comprising in this way, a radiator and an aftercooler can be divided | segmented and it can arrange | position in the separate chamber defined by the partition. In addition, the traveling wind can be separately introduced into the engine room and the cooling passage, so that the radiator and the aftercooler can be efficiently cooled.

  Moreover, the engine can be cooled as it is with the waste hot air that has cooled the radiator, and the outer peripheral surface of the exhaust gas aftertreatment device can be cooled with the waste hot air that has cooled the aftercooler. In particular, PM filter devices (devices that capture particulate matter (particulate matter) contained in exhaust gas) with an exhaust gas aftertreatment device capture and burn the particulate matter deposited on the filter. Therefore, it is necessary to eliminate the clogging of the filter and perform the filter regeneration process. However, during combustion, the outer peripheral surface of the exhaust gas aftertreatment device is in a high temperature state.

  By cooling the outer peripheral surface of the PM filter device, it is possible to prevent heat from the high temperature PM filter device from affecting the devices arranged around the PM filter device. be able to.

  And it can be set as the structure which is hard to receive the warm air in an engine room in a cooling channel | path by a partition. Since the aftercooler can be disposed in the cooling passage that is hardly affected by the warm air in the engine room, the cooling effect of the aftercooler and the waste hot air after cooling the aftercooler of the PM filter device The cooling effect when cooling the outer peripheral surface can be enhanced.

  Moreover, because the partition wall can prevent the waste heat air from the radiator flowing in the engine room and the waste heat air from the after cooler flowing in the cooling passage from colliding with each other, turbulence can be prevented. It is possible to prevent the air volume in the waste hot air from decreasing. Moreover, the waste hot air from the radiator flowing in the engine room can flow as rectification in the engine room, and the waste hot air from the aftercooler flowing in the cooling passage can flow as rectification in the cooling passage. As a result, it is possible to positively influence the respective air volumes in the engine room and the cooling passage.

  By the way, since the diameter of the cooling fan for cooling the radiator is large, noise generated from the cooling fan for the radiator is increased. However, since the cooling passage is defined as an engine room by the partition wall, the noise generated from the cooling fan for the radiator and the noise from the engine are prevented from leaking outside through the cooling passage. be able to.

  As a structure of the partition wall that defines the engine room and the cooling passage, it can be configured literally as a wall, or it can be configured using the side surface portion of the aftercooler as a part of the wall. In order to prevent the warm air in the engine room from affecting the aftercooler, it is desirable that the partition wall is also interposed between the side surfaces of the aftercooler.

  In this invention, it has the structure which arrange | positioned the aftercooler alongside the arrangement | positioning position of an engine. With this configuration, the length of the pipe connecting the aftercooler and the engine and the length of the pipe connecting the aftercooler and the supercharger can be reduced. Therefore, the pair of pipes connected to the aftercooler can be configured to have a short length arranged in the engine room, and to be configured to be hardly affected by warm air in the engine room. it can.

  In addition, even if a torsional force or vibration occurs in the body frame or the like due to the impact or vibration associated with the operation of the work machine, the aftercooler arranged side by side on the engine installation site And twisting and shaking occur at substantially the same phase.

  For this reason, it can prevent that each junction part of a pair of piping joined to the aftercooler loosens or breaks. Therefore, it is possible to support the pair of pipes joined to the aftercooler without using any special support means.

  Further, in the present invention, each connection port in the supercharger and the engine to which a pair of pipes connected to the aftercooler are connected is disposed in the engine room in a portion near the partition wall that defines the engine room and the cooling passage. Can be kept.

  By configuring in this way, the pipe length in the engine room in the pair of pipes connected to the after cooler can be further shortened, and the cooling efficiency in the pair of pipes connected to the after cooler is reduced. Can be prevented.

  Hereinafter, typical embodiments of a cooling device for a work machine according to the present invention will be specifically described with reference to the drawings. A dump truck is used as an example of the work machine.

  FIG. 1 is a plan view showing an arrangement state of a cooling device for a work machine according to the present invention, and illustration of a hood and a cover is omitted. FIG. 2 is a side view of a partition wall formed between the engine room and the cooling passage as viewed from the engine room side, and FIG. 3 is a schematic diagram illustrating a schematic arrangement relationship of the cooling device for the work machine according to the present invention. It is a top view.

  The engine room 11 is disposed along the front-rear direction of the work machine 10, and the engine room 11, the cooling fan 14 disposed in front of the engine 12, and the cooling fan 14 are disposed in front of the engine room 11. The radiator 13 and the hydraulic oil cooler 19 are arranged in series. An exhaust turbo supercharger 15 that is a supercharger is disposed in the engine room 11 in the upper part of the engine 12.

  The upper portion of the engine room 11 is covered with an engine hood 17 (see FIG. 2). The engine hood 17 separates the outside air above the engine hood 17 and the engine room 11 inside the engine hood 17. The engine room 11 surrounded by the engine hood 17, a partition wall 18 to be described later, and the lower surface plate of the engine room 11 is configured such that air flows along the front-rear direction of the work machine 10.

  Further, the work machine 10 has a cab 23 (see FIG. 1) mounted on the rear upper part of the engine room 11, and the left and right front wheels (not shown) are located behind the engine room 11 and below the cab 23. , Transmission, axle device, etc. are arranged.

  A cooling passage 20 is arranged in parallel with the engine room 11 along the front-rear direction of the work machine 10. A partition wall 18 that defines both chambers is disposed between the engine room 11 and the cooling passage 20. The cooling passage 20 is surrounded by an unillustrated aftercooler cover, a partition wall 18 and an unillustrated lower surface plate so that air taken from an outside air inlet provided in front of the aftercooler cover circulates backward. It is configured. As shown in FIG. 2, the partition wall 18 is configured so that air does not flow between the engine room 11 and the cooling passage 20.

  The aftercooler cover may be configured integrally with the engine hood 17 that covers the upper portion of the engine room 11 described above. On the contrary, instead of a configuration in which a PM filter device as an exhaust gas after-treatment device to be described later is integrally covered, a configuration in which the air flow is not hindered can be used.

  Further, as a part of the wall constituting the partition wall 18, a side wall surface of an aftercooler 21 disposed in a cooling passage 20 described later can be used. Instead of using the side wall surface of the aftercooler 21, the partition wall 18 that defines the engine room 11 and the cooling passage 20 can be configured only by the wall. The partition wall 18 may be configured to completely block between the engine room 11 and the cooling passage 20, or may not be configured to completely block between the engine room 11 and the cooling path 20. It is also possible to adopt a configuration having a gap that allows some air to enter and exit from the cooling passage 20.

  Even in the case of a configuration having a gap, the air flowing in the engine room 11 and the air flowing in the cooling passage 20 may be configured as a gap that is not disturbed by the air flowing in from the gap. desirable.

  In the cooling passage 20, an air cleaner 16, an after cooler 21, a cooling fan 22 that cools the after cooler 21, and a PM filter device 25 as an exhaust gas aftertreatment device that is cooled by waste heat air from the cooling fan 22. Are arranged in series. The PM filter device 25 is disposed above a front wheel (not shown) and to the side of the cab 23.

  The PM filter device 25 is a device (filter) that reduces particulate matter contained in exhaust gas from a diesel engine, and has a basic configuration of capturing particulate matter with a filter. The PM filter device 25 shown in the illustrated example has a self-activator that can regenerate the filter by burning particulate matter deposited on the filter in order to prevent the filter function from deteriorating when the filter is clogged. -A cleaning function is provided.

  The cooling fan 14 disposed in front of the engine 12 can be configured to be directly connected to the engine 12 or driven by a discharge pressure from a hydraulic pump (not shown) that drives the engine 12, as with the cooling fan 22 of the aftercooler 21. It is also possible to use a hydraulic motor that is driven by the hydraulic motor. Or it can also be set as the structure driven with an electric motor.

  By setting the cooling fan 14 and the cooling fan 22 to be driven by a hydraulic motor, the degree of freedom with respect to the arrangement position of the after cooler 21 such as the radiator 13 and the hydraulic oil cooler 19 can be increased. Further, the flow of cooling air by the cooling fan 14 and the cooling fan 22 may be configured as a flow on the suction side with respect to the radiator 13 and the aftercooler 21 as shown in FIG. The fan 22 may be arranged on the front side of the radiator 13 or the aftercooler 21 and configured as a discharge side flow.

  A pair of pipes 29 (only one pipe 29 is shown in FIG. 1) is connected to the radiator 13, and cooling water for cooling the engine 12 can be cooled. An air cleaner 16 disposed in the cooling passage 20 is connected to the exhaust turbocharger 15 via a pipe line 28. As shown in FIG. 2, the pipe 28 is formed in the partition wall 18, passes through the opening 32, is connected to the air cleaner 16, and is connected to the exhaust turbocharger 15 in the engine room 11.

  The outside air sucked through the air cleaner 16 is supplied to the exhaust turbo supercharger 15 through the conduit 28, and the exhaust turbo supercharger 15 is brought into a supercharged state by a compressor (not shown). After the supercharging state, the aftercooler 21 is supplied via the intake pipe 26a. A compressor (not shown) is driven to rotate by exhaust gas discharged from the engine 12.

  The supercharged air (also referred to as supercharged air) cooled by the aftercooler 21 passes through the intake pipe 26b and is taken into the engine 12 via an intake manifold (not shown). Then, it is mixed with fuel and used for combustion in the engine 12. Exhaust gas discharged from the engine 12 is introduced into the exhaust turbo supercharger 15 via an exhaust pipe (not shown). The exhaust gas introduced into the exhaust turbocharger 15 is used to rotate the turbine that drives the compressor that supercharges the air sucked through the air cleaner 16, and then passes through the exhaust pipe 27 to the PM. Introduced into the filter device 25. The exhaust gas introduced into the PM filter device 25 is released to the outside air after removing PM, which is particulate matter, by the filter.

  The exhaust manifold turbocharger 15 connected to the intake pipe 26a connected to the aftercooler 21 and the intake manifold 26 of the engine 12 connected to the intake pipe 26b connected to the aftercooler 21 are located near the partition wall 18. It is configured. Further, as shown in FIG. 2, the partition wall 18 has an opening 33a and an opening 33b. The opening 33a is configured as an opening for connecting the intake pipe 26a connected to the exhaust turbocharger 15 to the aftercooler 21, and the opening 33b supplies the air cooled by the aftercooler 21 to the engine 12. It is configured as an opening through which the intake pipe 26b passes.

  As shown in FIGS. 1 and 3, the position where the aftercooler 21 is disposed is a position arranged beside the position where the engine 12 is disposed. In addition, in FIG. 3, the schematic arrangement | positioning relationship of the cooling device is shown.

  With this configuration, the pipe lengths of the intake pipes 26a and 26b in the engine room 11 can be shortened. Also, with this configuration, the length of the intake pipes 26a, 26b in the engine room 11 can be shortened, so that air flowing in the intake pipes 26a, 26b due to warm air in the engine room 11 It can be prevented from being warmed.

  In addition, the configuration in which the aftercooler 21 is disposed beside the position where the engine 12 is disposed is affected by impacts, vibrations, and the like that occur during operation of the work machine 10, for example, traveling on a rough road (traveling over only one wheel). Thus, even if the vehicle body frame vibrates, the engine 12 and the aftercooler 21 can be twisted in the same phase or can be shaken in the same manner.

  By the way, the engine 12 is configured to be elongated in the direction of the rotation axis from which the output is extracted, and is configured to be short in the left-right direction (except for a single-cylinder engine or a star engine). In addition, the heavy engine 12 is easily affected by the twisting and shaking of the body frame. If the configuration in which the longitudinal direction of the engine 12 is arranged in the front-rear direction of the engine room 11 and the after-cooler 21 is arranged on the side of the intermediate position in the front-rear direction can be adopted, the mounting position of the after-cooler 21 can be further increased. It can arrange | position close to the gravity center position.

  Thus, by arranging the aftercooler 21, the influence of the twisting and shaking of the body frame can be reduced with respect to the aftercooler 21. In the present invention, since the aftercooler 21 can be disposed beside the position where the engine 12 is disposed, the aftercooler 21 can be disposed at an intermediate position in the front-rear direction of the engine 12.

  In this way, it is possible to prevent the joints between the pair of intake pipes 26a and 26b joined to the aftercooler 21 from being loosened or damaged. Therefore, the pair of intake pipes 26a and 26b joined to the aftercooler can be supported without using any special support means.

  Since the engine room 11 and the cooling passage 20 are configured through the partition wall 18, the air flow in the engine room 11 and the air flow in the cooling passage 20 are respectively It can be configured as an independent flow. In addition, when the work machine is traveling, traveling wind using the traveling of the work machine 10 can be individually introduced into the engine room 11 and the cooling passage 20.

  With this configuration, the cooling passage 20 is hardly affected by the warm air in the engine room 11, and the cooling effect on the aftercooler 21 and the cooling effect on the outer peripheral surface of the PM filter device 25 can be enhanced.

  In particular, since the cooling passage 20 can be used as a kind of duct, the traveling wind introduced into the cooling passage 20 and the air volume caused by the cooling fan 22 for the aftercooler 21 can be used as the cooling air for the aftercooler 21, PM The cooling device can effectively act as cooling air for the outer peripheral surface of the filter device 25.

  Thus, by cooling the outer peripheral surface of the PM filter device 25, it is possible to prevent the influence of heat on an unillustrated device arranged around the PM filter device 25, and the PM filter device. The temperature rise in the cab 23 arranged adjacent to 25 can be suppressed.

  In addition, since noise generated in the engine room 11 can be sound-insulated by the partition wall 18, noise generated in the engine room 11 is prevented from leaking outside through the cooling passage 20. be able to.

  The cooling device according to the present invention can be suitably applied to a work machine provided with a PM filter device.

It is a top view of the cooling device of the working machine which concerns on this invention. (Example) It is the side view which looked at the partition from the engine room. (Example) It is a schematic plan view which shows the schematic arrangement | positioning relationship of the cooling device of a working machine. (Example) It is a top view of the cooling device of a hydraulic shovel. (Conventional example)

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Work machine, 11 ... Engine room, 12 ... Engine, 13 ... Radiator, 15 ... Exhaust turbocharger, 18 ... Partition, 20 ... Cooling passage, 21 ... After cooler, 25 ... PM filter device, 51 ... Engine room, 52 ... Engine, 53 ... Cooling fan, 55 ... Radiator, 56 ... Turbocharger, 58 ... Air-cooled aftercooler.

Claims (2)

In a cooling device for a work machine comprising a radiator that cools engine cooling water and an aftercooler that cools air that has been supercharged by a supercharger,
An engine room for storing the engine is configured in the front-rear direction of the work machine. In the engine room, the radiator, a cooling fan for cooling the radiator, and the engine are arranged in this order in the front-rear direction of the work machine. Arranged along the
A cooling passage configured in the front-rear direction of the work machine and arranged in parallel with the engine room is defined as the engine room with a partition wall therebetween,
In the cooling passage, the aftercooler and an aftercooler cooling fan for cooling the aftercooler and the exhaust gas aftertreatment device are arranged in this order along the front-rear direction of the work machine,
A cooling device for a working machine, wherein the aftercooler is arranged side by side next to a position where the engine is arranged.   A pair of pipes connected to the after cooler are connected to each other, and each connection port in the supercharger and the engine arranged in the engine room is arranged in a portion close to the partition wall. The work machine cooling device according to claim 1.

Images