JP4777721B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device in a work vehicle, and more particularly to a cooling device capable of increasing the cooling efficiency of the cooling device and reducing noise.

  2. Description of the Related Art Conventionally, a work vehicle is provided with a hydraulic actuator including a hydraulic cylinder, a hydraulic motor, and a hydraulic pump, and various working machines are driven and the vehicle is driven by the operation of the hydraulic actuator. An engine is provided to drive the hydraulic pump. The engine is arranged in an engine room together with a hydraulic pump and other devices.

  Cooling devices such as a radiator that cools the cooling water supplied to the engine and an oil cooler that cools the hydraulic oil in the hydraulic actuator are provided in the engine room. Cooling of cooling water, hydraulic oil, or the like in the cooling device is performed by forcibly passing air taken in from outside air by a cooling fan through a radiator, an oil cooler, or the like.

  Each intake port is formed so that air intake ports serving as outside air intake ports are formed in the upper surface portion and the lower surface portion of the cover that covers the engine room, and the air taken in from each air intake port is supplied from the front of the cooling device. And a cooling device (see Patent Document 1) in which an air duct is disposed between the cooling device and the front of the cooling device has been proposed. There has also been proposed a cooling device (see Patent Document 2) in which an air inlet is formed on the front side of the cooling device without disposing an air duct.

  A cross-sectional view of the cooling device described in Patent Document 1 is shown in FIG. 9 as Conventional Example 1 of the present invention. As shown in FIG. 9, a cooling device 53 such as a radiator and an oil cooler, an engine 52, and the like are disposed in a cover 51 that covers the upper swing body 50. The outside air is taken in from the intake ports 55 and 56 provided on the upper surface and the lower surface of the cover 51 by the air flow generated by the cooling fan 54. The taken-in air is led to the front surface of the cooling device 53 by the upper and lower air guide ducts 60 and 61, respectively. The air flow is indicated by arrows.

  The air that has been warmed through the cooling device 53 is discharged to the outside from the respective exhaust ports 57 to 59 formed in the upper surface portion and the lower surface portion of the cover 51. In the air guide ducts 60 and 61, partition walls 62a and 62b and partition walls 63a and 63b are provided, respectively. The partition walls 62a and 62b and the partition walls 63a and 63b are configured so that the air flow in each of the air guide ducts 60 and 61 is a divided flow along the passages 64a to 64c and the passages 65a to 65c. Yes. Further, the partition walls 62a and 62b and the partition walls 63a and 63b are configured so that the air flow in the air guide ducts 60 and 61 is rectified.

  A sound absorbing material (not shown) is attached to the partition walls 62a, 62b, 63a, 63b, and airflow noise generated by the air flow flowing along the surfaces of the partition walls 62a, 62b, 63a, 63b and the sound absorbing material is reduced. ing. Note that the intake ports 55 and 56 and the exhaust ports 57 to 59 have a plurality of intake holes and a plurality of exhaust holes, respectively.

  A cross-sectional view of the cooling device described in Patent Document 2 is shown in FIG. 10 as Conventional Example 2 of the present invention. As shown in FIG. 10, a cooling device 74 such as a radiator and an oil cooler, an engine 73, and the like are disposed in an engine room 72 in a cover 71 that covers the upper swing body 70. The lower cover 76 positioned between the engine 73 and the cooling device 74 has an exhaust port at a position closer to the exhaust side of the cooling device 74 than the gap S between the side plate portion 79 of the engine room 72 and the partition plate 80. 78 is formed.

The outside air sucked into the engine room 72 from the intake port 77 formed on the front side of the cooling device 74 by a cooling fan (not shown) in the shroud 75 passes through the cooling device 74 and is then discharged to the outside from the exhaust port 78. The The intake port 77 and the exhaust port 78 have a plurality of intake holes and a plurality of exhaust holes, respectively.
Japanese Unexamined Patent Publication No. 2000-16094 JP-A-6-81367

  In the cooling device shown in Patent Document 1, in order to supply outside air from the front surface of the cooling device, the air guide ducts 60 and 61 must be formed, and a field space for forming the air guide ducts 60 and 61 is required. And Since the air that has passed through the cooling device is discharged to the outside from the exhaust ports 57 to 59 formed above and below the cover 51, the air flow in the engine room is disturbed, and the air that has passed through the cooling device is discharged. It will reduce efficiency.

  In addition, there is a risk that the air warmed by passing through the cooling device may stay in the engine room and adversely affect various devices arranged in the engine room.

  Since the exhaust ports 57 to 59 are formed at a plurality of portions above and below the cover 51, noise in the engine room easily leaks to the outside through the exhaust ports 57 to 59. For this reason, there was a problem that noise around the work vehicle could not be reduced. Since a sound absorbing material is disposed on the partition walls 62a, 62b, 63a, 63b of the air guide ducts 60, 61 disposed on the downstream side of the intake ports 55, 56, it leaks to the outside through the intake holes 55, 56. The noise that comes out can be reduced.

  However, the partition walls 62a, 62b, 63a, 63b are used to change the flow of air taken from outside air into a flow of rectification divided by the partition wall so that air is evenly supplied to the front surface of the cooling device. Yes. For this reason, the partition walls 62a, 62b, 63a, and 63b must be formed as passage curved surfaces each having a set curvature. Therefore, it is difficult to form the partition walls 62a, 62b, 63a, 63b as passage curved surfaces having a set curvature.

  Further, even if a curved curved surface having a bent corner and a set curvature is formed, a sound absorbing material is attached to each partition wall 62a, 62b, 63a, 63b. The sound absorbing material increases the passage resistance on each curved surface of the passage, and air cannot be evenly supplied to the front surface of the cooling device. For this reason, there existed a problem that the cooling efficiency of a cooling device worsened.

  In the cooling device described in Patent Document 2, since the intake port 77 for taking in outside air is formed on the front side of the cooling device 74, it is not necessary to dispose an air guide duct as in Patent Document 1. However, consideration is not given to the opening area as the intake port 77, and the opening area is small. For this reason, the flow rate of air that can be taken in from the intake port 77 is reduced.

  Therefore, the cooling efficiency for the cooling device 74 cannot be increased. If the capacity of the cooling fan is increased to increase the flow rate of air that can be taken in from the intake port 77, the taken-in air will flow unevenly, making it impossible to supply air evenly to the front surface of the cooling device. End up.

  Further, since the exhaust port 78 for discharging the air that has passed through the cooling device 74 to the outside is formed at a position closer to the exhaust side of the cooling device 74, the flow of air that has passed through the cooling device 74 is bent sharply. become. For this reason, replacement of the air staying in the rear side of the engine in the engine room 72, that is, in a region far from the cooling device 74, cannot be performed by the flow of air that has passed through the cooling device 74. Therefore, the temperature rise in the engine room 72 cannot be suppressed.

  SUMMARY OF THE INVENTION The present invention is to provide a cooling device that solves the problems of the conventional cooling device as described above and has a good air flow for cooling the cooling device.

The object of the present invention can be achieved by the inventions described in claims 1 and 2.
In other words, in the work vehicle cooling device according to the first invention of the present application, the intake ports for taking in outside air are arranged in the front of the cooling device, and the air that has passed through the cooling device is discharged to the outside of the work vehicle. An exhaust port is disposed below a portion of the engine far from the intake port and below a hydraulic pump connected to the engine, and a plurality of sound absorbing blades are disposed at the exhaust port, and the exhaust port Each of the sound absorbing blades provided on the longitudinal direction of the sound-absorbing blade is parallel to the flow direction of the air that has passed through the cooling device, and substantially parallel to a plane defined by the longitudinal direction and a vertical direction orthogonal to the longitudinal direction. The most important feature is that it is attached to.

According to the second aspect of the present invention, in the cooling device for a work vehicle, in the cooling device for the work vehicle, the intake ports for taking in outside air are concentrated on the front of the cooling device, and the air that has passed through the cooling device is An exhaust port that discharges to the outside of the vehicle is disposed below a portion of the engine far from the intake port and below a hydraulic pump connected to the engine,
A plurality of sound absorbing blades are disposed in the air intake port, and each of the sound absorbing blades provided in the air intake port is configured to be rotatable around an axis whose axis is the height direction of each sound absorbing blade, and The other most important feature is that the elevation angle with respect to the plate having the air intake hole provided in the air intake port is adjustable.

In the first invention and the second invention of the present application , since the intake ports are centrally arranged on the front surface of the cooling device, the air taken in from the intake ports is supplied to the front surface of the cooling device evenly and in a large amount. Can do. Thereby, a radiator, an oil cooler, an aftercooler, etc. as a cooling device can be cooled uniformly.

  In particular, even if radiators, oil coolers, aftercoolers, etc. are arranged side by side in a horizontal row, the intake ports are centrally arranged at the front of the cooling device, so each of the radiator, oil cooler, aftercooler, etc. It is possible to supply air that is evenly introduced to the front surface.

  Thereby, any one of the radiator, the oil cooler, the aftercooler and the like can be prevented from being biased and cooled, and the cooling efficiency as the cooling device can be increased. Further, since the air that has passed through the cooling device is discharged to the outside from the lower side of the part far from the intake hole of the engine, the air flow in the engine room can be made smooth. Accordingly, it is possible to increase the efficiency of discharging the air that has passed through the cooling device.

In the first and second inventions of the present application, an exhaust port can also be formed below the hydraulic pump in the engine room, so that air is exchanged in the engine room and air is circulated in the engine room. Can be performed efficiently. Moreover, in the first invention of the present application, a plurality of sound absorbing blades are arranged at the exhaust port, and the longitudinal direction of the plurality of sound absorbing blades provided at the exhaust port is parallel to the flow direction of the air passing through the cooling device. , And a structure that is mounted so as to be substantially parallel to a surface determined by the longitudinal direction and a vertical direction orthogonal to the longitudinal direction .
By configuring a plurality of sound absorbing blades in this way, it is possible to configure so that the flow of air that has passed through the cooling device is not obstructed by the plurality of sound absorbing blades. In addition, it is possible to greatly reduce the leakage of noise generated in the engine room to the outside. In particular, since the exhaust port is formed on the bottom side of the engine, the influence of noise in the engine room on the external work environment can be reduced.

Further, by arranging a plurality of sound absorbing blades at the intake port as in the second invention of the present application, it is possible to greatly reduce the leakage of noise generated in the engine room to the outside. In addition, a plurality of sound-absorbing blades provided at the intake port can be rotated around an axis about the height direction of each sound-absorbing blade, and the angle of elevation relative to the plate having the air intake hole provided at the intake port can be adjusted. Can be configured.
With the sound absorbing blade configured in this manner, the angle of elevation of the sound absorbing blade with respect to the plate can be adjusted, and the air taken in from the air intake holes of the plate can flow in a desired direction.

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. As the configuration of the cooling device of the present invention, in addition to the shape and arrangement configuration described below, if the shape and arrangement configuration can solve the problems of the present invention, it is possible to adopt the shape and arrangement configuration. It can be done. For this reason, this invention is not limited to the Example demonstrated below, A various change is possible.

  FIG. 1 shows a side view of a hydraulic excavator 1 to which a cooling device of the present invention is applied. As shown in FIG. 1, the excavator 1 has an upper swing body 3 disposed on an upper part of a lower traveling body 2 via a swing circle 7. The bottom of the upper swing body 3 is constituted by a revo frame 6. Mounted on the revo frame 6 are an outer cover 9 that covers the engine room 10, a counterweight 8 that forms the engine room 10 together with the outer cover 9, the cab 5, the work machine 4, and the like.

  The engine room 10 is formed laterally on the revo frame 6 with respect to the forward / backward direction of the excavator 1. An intake port 15 for taking outside air into the engine room 10 is arranged in one place behind the side portion of the excavator 1. The intake port 15 is configured as an intake port that is wide enough to supply outside air to a cooling device, an air cleaner, and the like (not shown) disposed in the engine room 10. The intake port 15 is covered with a plate 15b having a large number of intake holes. Reference numeral 19 denotes a rearview mirror for confirming the worker's rear view.

  2 to 4 show the arrangement of the engine 11, the cooling device 13, the intake port 15, the exhaust ports 16, 17, etc. in the engine room 10 on the revo frame 6. FIG. 2 is a plan view seen from the upper surface side of the revo frame 6, and FIG. 3 is a rear view seen from the rear of the excavator 1. FIG. 4 is a bottom view as seen from the bottom side of the revo frame 6.

  2 and 4, the left side of the drawing is the forward direction of the hydraulic excavator, and the right side is the backward direction of the hydraulic excavator. As shown in FIG. 2, the engine room 10 is configured laterally with respect to the forward / backward direction of the excavator 1 on the rear side of the excavator.

  A cooling device 13 is disposed on the front side of the engine 11, that is, on the lower side in FIG. 2, and an intake port 15 is formed on the front side of the cooling device 13. A shroud 26 containing a cooling fan (not shown) is disposed between the rear side of the cooling device 13, that is, the upper side in FIG. 2 and the engine 11. A hydraulic pump (not shown) connected to the engine 13 is disposed on the rear side of the engine 13.

  Covering the upper surface of the engine room 10, an exterior cover 9 is disposed as indicated by a two-dot chain line. The exterior cover 9 also has an inspection window 9a for performing maintenance and inspection of the engine 11 and the like in the engine room 10 by a two-dot chain line. An intake port 15 is formed in the side surface of the counterweight 8, and exhaust ports 16 and 17 are formed in the revo frame 6 at the rear side of the engine 11 and a hydraulic pump (not shown). FIG. 2 shows a state in which most of the exhaust port 16 is formed on the lower side of the engine 11.

  As shown in FIG. 2, the exhaust ports 16 and 17 are covered with plates 16b and 17b having a plurality of exhaust holes 16a and 17a, respectively. A plurality of sound absorbing blades 20 (see FIGS. 6 and 7) are disposed in the exhaust port 16. The sound absorbing blade 20 has a detailed shape in FIGS. 6 and 7 showing the VI-VI cross section and the VII-VII cross section of FIG. 2, respectively. The description of the sound absorbing blade 20 using FIGS. 6 and 7 will be given later.

  FIG. 3 shows a view when viewed from the rear side of the hydraulic excavator from the right side to the left side of FIG. As shown in FIG. 3, the air inlet 15 is formed over a wide range on the side surface of the counterweight 8. That is, the intake port 15 is formed in a concentrated state so as to have a large area so that a desired amount of air can be taken in on the front side of the cooling device 13. The intake port 15 is covered with a plate 15b having a large number of intake holes 15a, and the plate 15b is attached to the counterweight 8 via bolts.

  In addition, in FIG. 3, since the rear view seen from the outer side of the counterweight 8 is shown, the engine 11, the cooling device 13, and the shroud 26 in the engine room are indicated by dotted lines.

  As shown in FIG. 3, exhaust ports 16 and 17 are formed through the rebo frame 6 on the rear side of the engine 11, that is, below the right side in FIG. 3. The exhaust ports 16 and 17 are covered with plates 16b and 17b, respectively. Each plate 16b, 17b is attached to the revo frame 6 with bolts or the like.

  As shown on the bottom side of the revo frame 6 in FIG. 4, the plates 16 b and 17 b covering the exhaust ports 16 and 17 respectively have a larger opening area in the exhaust port 16 formed on the lower side of the engine 11. Forming. As a result, a large amount of air that has passed through the cooling means 13 is discharged from the exhaust port 16.

  Further, since the exhaust port 17 is formed, the air staying in the engine room 10 is easily discharged to the outside together with the air discharged from the exhaust port 17. Thereby, the air in the engine room 10 can be replaced. A plurality of exhaust holes 16a and 17a are formed in each plate 16b and 17b.

  FIG. 5 schematically shows how the air taken in from the intake port 15 circulates in the engine room 10 and is then discharged to the outside through the exhaust ports 16 and 17. The flow of air taken from the intake port 15 will be described with reference to FIG. In FIG. 5, a sound absorbing blade described later with reference to FIGS. 6 to 8 is omitted.

  As shown by the arrows, outside air is taken in by the suction force of the intake fan 13a provided in the shroud 26 from the intake port 15 provided in a concentrated manner on the front surface of the cooling device 13. The air taken in from the intake port 15 can be supplied to the entire surface of the cooling device 13 in a substantially uniform state. As a result, even if radiators, oil coolers, air coolers, etc. are arranged side by side so that their front faces face the intake port 15 side by side-by-side, air is evenly distributed to each radiator, oil cooler, air cooler, etc. Can be supplied.

  For this reason, for example, it is possible to prevent the occurrence of uneven cooling in which a large amount of air is supplied only to the radiator and the oil cooler or the like is not sufficiently cooled. Further, since air can be evenly supplied to the radiator, the oil cooler, the air cooler, etc., the cooling efficiency of each of the radiator, the oil cooler, the air cooler, etc. can be increased. Therefore, the cooling efficiency of the cooling device 13 constituted by each radiator, oil cooler, air cooler, etc. can be increased.

  The air that has passed through the cooling device 13 can be mainly discharged from the exhaust port 16, and the flow of air from the cooling device 13 to the exhaust port 16 can be improved. Further, part of the air that has passed through the cooling device 13 passes through the space on the rear side of the engine 11 and is discharged to the outside from the exhaust port 17, so that the air can be agitated in the engine room 10. The situation where air is trapped in the engine room 10 can be prevented.

  Next, the sound absorbing blades 20 and 30 will be described with reference to FIGS. 6 shows a VI-VI cross section in FIG. 2, and FIG. 7 shows a VII-VII cross section in FIG. FIG. 8 shows a perspective view of the main part of the intake port 15.

  As shown in FIGS. 6 and 7, the sound absorbing blade 20 disposed in the discharge port 16 is provided with a sound absorbing material 21 so as to cover the periphery of the support blade 20a. The support blade 20a can be attached to the plate 16b, or can be attached to the revo frame 6 or the like via support means (not shown). The height of the sound absorbing blade 20 is formed to be substantially the same position as the surface of the revo frame on the engine room 10 side. Thereby, as shown in FIGS. 6 and 7, an air flow path can be formed between the sound absorbing material 21 and the bottom of the engine 11.

  As shown in FIG. 7, the sound absorbing blade 20 is disposed so as to be substantially parallel to the paper surface of FIG. 7 so that the flow of air that has passed through the cooling device 13 is not hindered. In the illustrated example, a configuration in which a sound absorbing blade is not provided at the exhaust port 17 is shown. However, when noise leaking from the exhaust port 17 becomes a problem, a sound absorbing blade such as a sound absorbing blade is disposed at the exhaust port 17. A material can also be provided.

  The number of the sound absorbing blades 20 in FIG. 6 is an example. The number, location, and the like of the sound absorbing blades 20 can be appropriately configured in consideration of air discharge efficiency, noise reduction effect, and the like.

  Next, the sound absorbing blade 30 at the air inlet 15 will be described with reference to FIG. A large number of intake holes 15 a are formed in the plate 15 b that covers the intake ports 15. The plate 15b is fixed to a counterweight (not shown) via bolts or the like. A plurality of sound absorbing blades 30 are arranged on the engine room side of the plate 15b. The sound absorbing blade 30 has a configuration in which the periphery of the support blade 30 a is surrounded by a sound absorbing material 31.

  The sound absorbing blade 30 can adjust the elevation angle with respect to the plate 15b so that the air taken in from the intake hole 15a can flow in a desired direction. The elevation angle of the sound absorbing blades 30 can be adjusted to be rotatable about the height direction of each sound absorbing blade 30. Further, each sound absorbing blade 30 whose elevation angle has been adjusted is fixed to a frame 23 erected from a revo frame (not shown) via support pieces 24 and 25. The height of the sound absorbing blade 30 can be set to an appropriate size, for example, in relation to the installation space of an air cleaner or the like provided above the sound absorbing blade 30.

  By arranging the sound absorbing blades 20 and 30 at the intake port 15 and the exhaust port 16, it is possible to greatly reduce the leakage of noise generated in the engine room to the outside and improve the working environment in the hydraulic excavator. Can be made.

  As an embodiment of the present invention, a hydraulic excavator has been described as an example, but the present invention is not limited to a hydraulic excavator, and can be applied to various work vehicles such as construction machines and civil engineering machines. It can be done. The sound absorbing materials 21 and 31 can be made of a porous material such as urethane foam, glass wool, felt or the like. Further, the sound absorbing materials 21 and 31 can be configured to have a sound absorbing effect and to be a rectifying member for the air flowing on the surface of the sound absorbing material.

  The technical idea of the present invention can be applied to a device or the like to which the technical idea of the present invention can be applied.

It is a side view of a hydraulic excavator. (Example) It is the principal part top view which looked at the revo frame from the upper surface. (Example) It is the rear view which looked at the engine room of the revo frame from the back of a hydraulic excavator. (Example) It is the bottom view seen from the bottom of the revo frame. (Example) It is a schematic diagram explaining the flow of the air in an engine room. (Example) It is VI-VI sectional drawing of FIG. (Example) It is VII-VII sectional drawing of FIG. (Example) It is the perspective view which showed the sound-absorption blade in an inlet port. (Example) It is a schematic diagram explaining the flow of the air in an engine room. (Conventional example 1) It is a schematic diagram explaining the flow of the air in an engine room. (Conventional example 2)

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic excavator, 6 ... Revo frame, 8 ... Counterweight, 9 ... Exterior cover, 9a ... Inspection window, 10 ... Engine room, 11 ... Engine, 13. ..Cooling device, 15 ... intake port, 15a ... intake port, 15b ... plate, 16 ... exhaust port, 16a ... exhaust port, 16b ... plate, 17 ... exhaust Mouth, 17a ... exhaust hole, 17b ... plate, 20 ... sound absorbing blade, 20a ... support blade, 21 ... sound absorbing material, 30 ... sound absorbing blade, 30a ... support blade, 31 ... Sound absorbing material, 50 ... Upper rotating body, 51 ... Cover, 52 ... Engine, 53 ... Cooling device, 55, 56 ... Intake hole, 57-59 ... Exhaust Hole, 60, 61 ... Air guide duct, 62a, 62b ... Cut wall, 63a, 63b ... partition wall, 70 ... upper turning body, 71 ... cover, 72 ... engine room, 73 ... engine, 74 ... cooling device, 77 ... Intake hole, 78 ... exhaust hole.

Claims (2)

In a cooling device for a work vehicle,
An intake port for taking in outside air is concentrated on the front of the cooling device, and arranged.
An exhaust port for discharging the air that has passed through the cooling device to the outside of the work vehicle is disposed below a portion of the engine far from the intake port and below a hydraulic pump connected to the engine,
A plurality of sound absorbing blades are disposed at the exhaust port, and each of the sound absorbing blades provided at the exhaust port has a longitudinal direction parallel to a flow direction of air passing through the cooling device, and the longitudinal direction and the A cooling device, wherein the cooling device is attached so as to be substantially parallel to a surface determined by a vertical direction orthogonal to the longitudinal direction . In a cooling device for a work vehicle,
An intake port for taking in outside air is concentrated on the front of the cooling device, and arranged.
An exhaust port for discharging the air that has passed through the cooling device to the outside of the work vehicle is disposed below a portion of the engine far from the intake port and below a hydraulic pump connected to the engine,
A plurality of sound absorbing blades are disposed in the air intake port, and each of the sound absorbing blades provided in the air intake port is configured to be rotatable around an axis whose axis is the height direction of each sound absorbing blade, and A cooling device configured to be capable of adjusting an elevation angle with respect to a plate having an intake hole provided in the intake port.

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