JP2014173491A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine capable of improving yield of a fan shroud having a bell mouth shape and reducing its cost.SOLUTION: A fan shroud 22 comprises: a fixed frame member 23 fixed to a heat exchanger 19; a fan ring 24 attached to the fixed frame member 23; and L-shaped ring 25 fixed to the fan ring 24. The L-shaped ring 25 is constituted by an annular fixing plate 25A formed as a cylinder body having L-shaped section by applying a rolling work against L-shaped plate in which a strip-like plate member is bent into L-shape, with its outer diameter side 25A1 being fixed to an opening end 24C of the fan ring 24 and its inner diameter side 25A2 being extended toward a cooling fan 20, and a bent plate part 25B bent from the inner diameter side 25A2 of the fixing plate 25A in a longitudinal direction. This configuration causes yield to be improved, so that it enables a manufacturing cost to be reduced.

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a wheel loader, and more particularly to a construction machine provided with a fan shroud for adjusting the flow of cooling air.

  In general, a hydraulic excavator as a typical example of a construction machine has a vehicle body composed of a crawler-type lower traveling body that can be self-propelled and an upper revolving body that is turnably mounted on the lower traveling body. A working device is provided on the front side of the head so as to move up and down. And a hydraulic excavator performs excavation work of earth and sand, etc. using a working device, turning an upper revolving structure.

  Here, the upper swing body of the excavator includes a swing frame that forms a support structure, a counterweight that is provided on the rear end side of the swing frame and that balances the weight of the working device, and is positioned on the front side of the counterweight. Then, an engine as a prime mover mounted on the swivel frame, a heat exchanger provided in the vicinity of the engine for cooling the heated liquid, and arranged to face the heat exchanger, the cooling air is supplied to the heat exchanger. And a cooling fan to be supplied.

  In this case, the heat exchanger is composed of a radiator that cools engine coolant, an oil cooler that cools hydraulic oil, etc., and cooling air is supplied to the heat exchanger when the cooling fan rotates during engine operation. In addition, the liquid to be cooled, such as engine cooling water and hydraulic oil, can be cooled.

  On the outer peripheral side of the cooling fan that supplies cooling air to the heat exchanger, a fan shroud is provided surrounding the cooling fan. The inner surface of the fan shroud is shaped like a bell mouth so that the flow of the cooling air is smoothed to adjust the intake sound (wind noise) and the air volume (see, for example, Patent Document 1).

JP 2002-332843 A

  Here, according to the above-described prior art, since the inner surface shape of the fan shroud is a bell mouth shape using a plurality of porous materials, there is a problem that the assembly process is troublesome. In addition, since the porous material and other parts constituting the shroud are manufactured separately, there is a problem that the cost increases.

  In another conventional technique, the bell mouth portion of the fan shroud is molded by press working using a mold. However, in the case of press working, a die must be manufactured for each of a plurality of types of bell mouths having different diameters, which increases the cost.

  In addition, a method of manufacturing a bell mouth part by cutting a flat plate into a ring shape and joining it by welding or the like is also conceivable, but when manufacturing a large number of bell mouth parts, the yield decreases and the cost increases. There's a problem.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a construction machine capable of improving the yield of fan shrouds having a bell mouth shape and reducing the cost.

  In order to solve the above-described problems, the present invention is directed to a vehicle body on which a prime mover is mounted and capable of traveling, a heat exchanger that is provided on the vehicle body and cools a heated liquid, and is disposed facing the heat exchanger. The present invention is applied to a construction machine including a cooling fan that supplies cooling air to a heat exchanger and a fan shroud that surrounds the outer peripheral side of the cooling fan.

  The feature of the configuration adopted by the invention of claim 1 is that the fan shroud is attached to the heat exchanger on one side in the length direction and has a frame-like fixed frame member that is open on the other side in the length direction, Roll bending a cylindrical fan ring that surrounds the outer peripheral side of the cooling fan, one side in the length direction is attached to the opening side of the fixed frame member and the other side in the length direction is opened, and an L-shaped plate material Is formed as a cylindrical body having an L-shaped cross section, and is configured by an L-shaped ring that is attached to the opening side of the fan ring and that adjusts the intake sound and the air volume of the cooling air supplied to the heat exchanger. .

  According to a second aspect of the present invention, the L-shaped ring includes an annular mounting plate portion having an outer diameter side attached to the opening end of the fan ring and an inner diameter side extending toward the cooling fan, and an inner diameter side of the mounting plate portion. This is because it is constituted by a bent plate portion bent in the length direction.

  According to the first aspect of the present invention, after a strip-shaped plate material is bent into an L shape, a cylindrical L-shaped ring is formed by roll bending the L-shaped plate material. Can do. This makes it possible to cut a strip-shaped plate material, which is the material of the L-shaped ring, from a flat plate material without waste. Compared to, for example, manufacturing a bell mouth part by cutting a flat plate into a ring shape. As a result, the yield of the fan shroud can be improved and a pressing mold can be eliminated, so that the manufacturing cost of the fan shroud can be reduced. Moreover, by simply changing the length of the L-shaped plate material and the bending rate of the roll bending process, L-shaped rings (bell mouth parts) with different types of diameters can be easily molded. It can correspond to the manufacture of the fan shroud.

  According to the invention of claim 2, since the L-shaped ring is formed as a cylindrical body having an L-shaped cross section by the mounting plate portion and the bent plate portion, the L-shaped ring as the bell mouth portion can be easily formed. Can be molded. In addition, by appropriately adjusting the length dimensions of the mounting plate portion and the bent plate portion, it is possible to easily adjust the intake sound and the air volume of the cooling air supplied to the heat exchanger.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. FIG. 2 is a plan view of the excavator of FIG. 1 as viewed from above in a state where a rear side of an exterior cover is omitted. It is a perspective view which shows an engine, a cooling fan, a fan shroud, a heat exchanger, etc. It is a disassembled perspective view which shows a cooling fan, an L-shaped ring, a fan ring, a fixed frame member, and a heat exchanger. It is a disassembled perspective view which shows a cooling fan, a fan shroud, and a heat exchanger. It is a perspective view shown in the state where a cooling fan, a fan shroud, and a heat exchanger were assembled. It is sectional drawing seen from the arrow VII-VII direction in FIG. 2 which shows a cooling fan and a fan shroud. It is sectional drawing seen from the arrow VIII-VIII direction in FIG. 7 which shows an L-shaped ring and a fan ring.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic excavator as a representative example.

  In FIG. 1, reference numeral 1 denotes a cab specification hydraulic excavator as a construction machine applied to the present embodiment. The hydraulic excavator 1 includes a self-propelled crawler type lower traveling body 2 having crawler belts on the left and right. The upper swing body 3 that is turnably mounted on the lower traveling body 2 and constitutes the vehicle body together with the lower traveling body 2, and is provided so as to be able to move up and down on the front side of the upper swing body 3, and excavation work of earth and sand, etc. And the work device 4 that performs the above.

  As shown in FIG. 2, the upper swing body 3 is formed in a substantially circular shape so as not to collide with surrounding obstacles when the swing operation is performed. The upper swing body 3 includes a swing frame 5, a cab 6, a counterweight 7, an engine 10, a heat exchanger 19, a cooling fan 20, a fan shroud 22, an outer cover 26, and the like, which will be described later.

  Reference numeral 5 denotes a revolving frame constituting a support structure for the upper revolving structure 3. The revolving frame 5 includes a flat bottom plate 5A extending in the left and right intermediate portions in the front and rear directions, an arcuate left frame member 5B positioned on the left side of the bottom plate 5A, and a right side of the bottom plate 5A. And the arc-shaped right frame member 5C located at the center. Further, the revolving frame 5 includes a left vertical plate 5D and a right vertical plate 5E which are erected on the upper surface side of the bottom plate 5A so as to be spaced apart in the left and right directions and are substantially V-shaped, and the vertical plates 5D and 5E. A support bracket 5 </ b> F (see FIG. 1) is provided at the front end.

  The working device 4 is attached to the support bracket 5F located on the front end side of the revolving frame 5 so as to be swingable leftward and rightward, and a counterweight 7 described later is disposed on the rear end side of the bottom plate 5A of the revolving frame 5. Is configured to be attached. Further, a heat exchanger mounting base 5G is disposed between the rear side of the right vertical plate 5E and the rear side of the right frame member 5C, and a heat exchanger to be described later is disposed on the heat exchanger mounting base 5G. 19 is attached.

  A cab 6 is provided on the left side which is one side of the left and right directions on the revolving frame 5, and the cab 6 forms a living space for an operator who operates the excavator 1. A driver's seat is provided in the cab 6, and an operating device for driving, an operating device for work (both not shown), and the like are disposed around the driver's seat.

  Reference numeral 7 denotes a counterweight attached to the rear end portion of the swivel frame 5, and the counterweight 7 is made of, for example, a heavy object integrally formed using casting means, and rises upward from the rear end portion of the swivel frame 5. ing. The counterweight 7 balances the weight with the work device 4 and covers the engine 10, the heat exchanger 19 and the like, which will be described later, from the rear.

  A hydraulic oil tank 8 is provided on the right side of the revolving frame 5 on the opposite side of the cab 6 in the left and right directions. The hydraulic oil tank 8 stores therein hydraulic oil supplied to a hydraulic pump 18 described later. Since the hydraulic oil tank 8 applies pressure to the inside so that the hydraulic oil can be efficiently supplied toward the hydraulic pump 18, the hydraulic oil tank 8 is long in the forward, backward, upward, and downward directions using, for example, a steel plate or a resin material. It is formed with high strength as a rectangular parallelepiped box structure.

  A fuel tank 9 is mounted on the revolving frame 5 adjacent to the right side of the hydraulic oil tank 8. The fuel tank 9 stores fuel to be supplied to an engine 10 to be described later, and is formed as a substantially rectangular parallelepiped sealed container by molding using a resin material, welding using a steel plate, or the like. .

  Reference numeral 10 denotes an engine as a prime mover which is located on the front side of the counterweight 7 and is mounted on the turning frame 5. The engine 10 drives a hydraulic pump 18 and the like which will be described later. The engine 10 is arranged in a horizontally placed state in which the axis of a crankshaft (not shown) extends leftward and rightward, and its four corners are attached to the revolving frame 5 via vibration-proof mounts 11. A water pump (water pump) 12 and a power generator alternator 13 are disposed on the front and rear sides of the engine 10 on one side of the left and right sides (right side in the present embodiment) above the crankshaft. It is provided side by side in the direction.

  Here, the water pump 12 is driven by the engine 10 to circulate engine cooling water through a water jacket (not shown) of the engine 10. The alternator 13 generates electric power when driven by the engine 10.

  For this purpose, as shown in FIG. 3 and the like, a drive pulley 14 is attached to the end of the crankshaft of the engine 10, a first driven pulley 15 is attached to the rotating shaft 12A of the water pump 12, and the alternator 13 A second driven pulley 16 is attached to a rotating shaft (not shown), and the driving pulley 14 and the first and second driven pulleys 15 and 16 are arranged on the same plane.

  An endless belt 17 called a V-belt is wound around the driving pulley 14 and the first and second driven pulleys 15 and 16, and the rotation of the driving pulley 14 is first and second via the endless belt 17. The water pump 12 and the alternator 13 are driven by the engine 10 by being transmitted to the driven pulleys 15 and 16.

  Reference numeral 18 denotes a hydraulic pump attached to the other side (left side in the present embodiment) of the left and right directions of the engine 10. The hydraulic pump 18 is mounted on the excavator 1 by being driven by the engine 10. Pressure oil for operation is supplied to various hydraulic actuators.

  Reference numeral 19 denotes a heat exchanger provided on one side (right side) of the left and right directions of the engine 10, and the heat exchanger 19 cools a heated fluid such as engine coolant or hydraulic oil. . Here, the heat exchanger 19 is configured by a radiator 19A, an oil cooler 19B, and the like mounted on the heat exchanger mounting base 5G of the swivel frame 5. On the surface of the radiator 19A opposite to the oil cooler 19B, A fan shroud 22 is attached so as to surround the outer peripheral side of the cooling fan 20 described later.

  The radiator 19A cools the heated engine cooling water by radiating the heat of the engine cooling water circulated between the water jacket of the engine 10 into the cooling air from the cooling fan 20 by the heat radiating portion 19A1. To do. On the other hand, the oil cooler 19B cools the heat of the hydraulic oil (returned oil) circulating from various hydraulic actuators mounted on the hydraulic excavator 1 to the hydraulic oil tank (not shown) with a heat radiating section (not shown). Heated hydraulic oil is cooled by releasing heat into the cooling air from 20.

  Reference numeral 20 denotes a suction type cooling fan disposed facing the heat exchanger 19. The cooling fan 20 is attached to the first driven pulley 15 and is rotationally driven by the engine 10 together with the water pump 12. Here, as shown in FIG. 4 and the like, the cooling fan 20 has a cylindrical portion 20A and an inward flange shape that is provided on the inner peripheral side of the cylindrical portion 20A and is attached to the first driven pulley 15 via a connecting member 21. Mounting portion 20B, and a plurality of (seven in the present embodiment) blades 20C arranged in a row on the outer peripheral side of the cylindrical portion 20A.

  Then, the cooling fan 20 is driven by the engine 10 to suck outside air into the exterior cover 26 as indicated by an arrow F in FIG. 2, and the radiator 19 </ b> A of the heat exchanger 19 is used as the outside air as cooling air. This is supplied to the oil cooler 19B and the like.

  Next, the fan shroud 22 used in the present embodiment for adjusting the flow of cooling air will be described.

  A fan shroud 22 surrounds the outer peripheral side of the cooling fan 20. The fan shroud 22 adjusts the flow of cooling air around the cooling fan 20. Here, the fan shroud 22 is roughly constituted by a fixed frame member 23, a fan ring 24, and an L-shaped ring 25 described later.

  Reference numeral 23 denotes a fixed frame member serving as a base of the fan shroud 22. The fixed frame member 23 is attached to the radiator 19A on one side (right side in the present embodiment) in the length direction (center axis line AA direction) and is open on the other side (left side) in the length direction. . Here, the fixed frame member 23 is formed of a metal material such as a steel plate, for example, and has a substantially rectangular shape fixed to the radiator 19A of the heat exchanger 19 using a fastening member (not shown) such as a bolt. At positions corresponding to the four corners of the frame plate portion 23A and the heat radiating portion 19A1 of the radiator 19A, from the frame plate portion 23A to the other side (left side in the present embodiment) in the length direction (center axis AA direction). The four bulging portions 23B projecting toward the main portion are roughly configured.

  Each of these bulging portions 23B is formed in a hollow, substantially triangular prism shape, and an end edge 23B1 of each bulging portion 23B is configured to abut a recessed portion 24A of a fan ring 24 described later. Thus, the cooling air is configured to efficiently flow from the heat radiating portion 19A1 to each of the bulging portions 23B and the fan ring 24 described later to the cooling fan 20 side.

  Reference numeral 24 denotes a fan ring that surrounds the outer peripheral side of the cooling fan 20. The fan ring 24 is formed in a cylindrical shape by roll-bending a flat plate material made of a metal material such as a steel plate and fixing its edge by welding or the like. The fan ring 24 has one side (right side in the present embodiment) in the length direction (center axis line AA direction) attached to the opening side of the fixed frame member 23 and the other side (left side) in the length direction. It is open.

  On one side in the length direction of the fan ring 24, four recessed portions 24A are provided so as to be separated in the circumferential direction. Specifically, each recess 24 </ b> A is provided to be recessed from the right edge 24 </ b> B on one side in the length direction of the fan ring 24 at a position corresponding to the bulging portion 23 </ b> B of the fixed frame member 23. It is formed so that it can be fitted into the bulging portion 23B. As a result, the fan ring 24 secures each recess 24A to the end edge 23B1 of the bulging portion 23B using means such as welding, and the right end edge 24B is welded to the frame plate portion 23A of the fixed frame member 23. By fixing using means, it is configured to be integrally attached to the fixed frame member 23. On the other hand, the other side in the length direction of the fan ring 24 is an annular opening end 24C, and an L-shaped ring 25 described later is attached to the opening end 24C.

  Reference numeral 25 denotes an L-shaped ring as a bell mouth portion attached to the opening side of the fan ring 24. The L-shaped ring 25 has an outer diameter side 25A1 attached to the opening end 24C of the fan ring 24, an inner diameter side 25A2 extending toward the cooling fan 20, an annular mounting plate portion 25A, and the mounting plate portion 25A. It comprises a bent plate portion 25B that bends in the length direction from the inner diameter side 25A2. As shown in FIG. 8, the L-shaped ring 25 is formed by bending a flat plate made of a metal material such as a steel plate into an L shape so that the mounting plate portion 25A and the bent plate portion 25B intersect each other at approximately 90 degrees. After processing and roll-bending the L-shaped plate material, the end edge thereof is fixed using means such as welding to form a cylindrical body having an L-shaped cross section.

  Then, the right side surface 25A3 of the mounting plate portion 25A located on one side in the length direction of the L-shaped ring 25 is brought into contact with the opening end 24C of the fan ring 24, and the contact portion is fixed by welding or the like. Thus, the L-shaped ring 25 is configured to be integrally attached to the fan ring 24.

  Here, when the rotational speed of the cooling fan 20 is constant, for example, the smaller the distance (gap) between the inner peripheral surface 25B1 of the bent plate portion 25B of the L-shaped ring 25 and the outer peripheral edge portion of the blade 20C of the cooling fan 20 is. The cooling air flow (fan air flow) increases and the cooling performance improves, but the wind noise increases and the noise increases. On the contrary, as the interval (gap) is larger, the amount of cooling air is reduced and the cooling performance (heat balance) is lowered, but the wind noise is reduced and the noise can be reduced. Further, the relationship between the cooling performance and the noise also changes depending on the amount of covering of the blade 20C of the cooling fan 20 and the bent plate portion 25B of the L-shaped ring 25.

  Therefore, the L-shaped ring 25 has a length B of the mounting plate portion 25A so that the noise can be reduced as much as possible while maintaining sufficient cooling performance so that the cooling performance and noise are optimized. The length C of the bent plate portion 25B is appropriately changed according to the shape of the cooling fan 20 and the rotation speed.

  Reference numeral 26 denotes an exterior cover that surrounds the cab 6 and is provided on the revolving frame 5. The exterior cover 26 includes the engine 10, the hydraulic pump 18, the heat exchanger 19, and the like together with the counterweight 7 as shown in FIG. It covers. Then, in the portion of the outer cover 26 facing the heat exchanger 19, there are a cooling air inlet that allows the cooling air to flow into the outer cover 26 by the rotation of the cooling fan 20, and cooling air that has cooled the heat exchanger 19 and the like. Cooling air outlets (both not shown) are formed to flow out to the outside.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and next, an operation when performing excavation work of earth and sand using the hydraulic excavator 1 will be described.

  First, the operator sits in a driver seat (not shown) in the cab 6, starts the engine 10, and drives the hydraulic pump 18. In this state, an operator seated in the driver's seat operates a travel lever / pedal or the like (not shown) to cause the lower traveling body 2 to self-travel and move the hydraulic excavator 1 to the work site. After the excavator 1 moves to the work site, the operator can perform excavation work such as earth and sand by the work device 4 while turning the upper swing body 3 by operating a work lever (not shown). it can.

  Here, when the engine 10 is operated to rotate the crankshaft, the rotation of the crankshaft is transmitted from the driving pulley 14 to the first and second driven pulleys 15 and 16 via the endless belt 17, and the first driven The rotation shaft 12 </ b> A of the water pump 12 is rotated by the rotation of the pulley 15, and the rotation shaft of the alternator 13 is rotated by the rotation of the second driven pulley 16. As a result, the engine coolant is circulated in the water jacket of the engine 10 by the water pump 12, and power is generated by the alternator 13.

  In this case, as the cooling fan 20 rotates with the rotation of the first driven pulley 15, the outside air is sucked into the exterior cover 26 as indicated by an arrow F in FIG. Thus, the oil cooler 19B and the radiator 19A of the heat exchanger 19 are supplied. At this time, the flow of the cooling air passing around the cooling fan 20 is adjusted by the fan shroud 22 that covers the outer peripheral side of the cooling fan 20.

  In particular, the L-shaped ring 25 of the fan shroud 22 is formed so that the cooling performance and noise are optimized, for example, the shape of the cooling fan 20 and the noise are reduced as much as possible while maintaining sufficient cooling performance. The length dimension B of the mounting plate portion 25A and the length dimension C of the bent plate portion 25B are set according to the rotational speed. Thereby, while being able to supply cooling air efficiently to oil cooler 19B, radiator 19A, etc., the noise at the time of operation of cooling fan 20 can be reduced.

  Next, manufacture and assembly of the fan shroud 22 according to the present embodiment, which is constituted by three members of the fixed frame member 23, the fan ring 24, and the L-shaped ring 25, will be described.

  When manufacturing the fixed frame member 23, the thin plate-shaped steel plate material having an open central portion is bent using a bending device or the like. Thereby, the four bulging parts 23B corresponding to the frame board part 23A used as a base and the heat radiating part 19A1 of the radiator 19A of the heat exchanger 19 can be molded.

  When manufacturing the fan ring 24, the concave and convex flat plate material having concave portions (recessed portions 24 </ b> A) at four locations is subjected to roll bending using a roll bending apparatus or the like, and then both ends thereof are welded. It adheres by etc. Thereby, the cylindrical fan ring 24 can be molded without performing press working using a mold. Here, when a plurality of fan rings 24 are manufactured, for example, one large flat plate material, and the adjacent uneven flat plate materials are shifted and cut so that the concave portions and the convex portions overlap (correspond). As a result, waste of materials can be eliminated and yield can be improved.

  When the L-shaped ring 25 is manufactured, first, a flat plate (strip-shaped) steel plate material is bent using a bending apparatus so that it intersects in an L shape with an angle of approximately 90 degrees. The mounting plate portion 25A and the bent plate portion 25B are molded. And after giving a roll bending process with respect to this L-shaped board | plate material using a roll bending apparatus, the both ends are fixed by welding etc. FIG. Thereby, the L-shaped ring 25 which consists of a cylindrical body with a L-shaped cross section can be shape | molded, without performing the press work using a metal mold | die. At this time, the outer diameter dimension of the L-shaped ring 25 is formed larger than the outer diameter dimension of the fan ring 24, the inner diameter dimension of the L-shaped ring 25 is smaller than the inner diameter dimension of the fan ring 24, and the cooling fan. It is formed larger than the outer diameter size of 20.

  Here, when manufacturing a plurality of L-shaped rings 25, for example, by cutting a strip-shaped plate material without a gap from one large flat plate material, waste of material can be eliminated and yield can be improved. Can do.

  Thus, when assembling the fixed frame member 23, the fan ring 24, and the L-shaped ring 25, which are molded as separate members, first, the recessed portion of the fan ring 24 is formed on the bulging portion 23B of the fixed frame member 23. The fixed frame member 23 and the fan ring 24 can be assembled integrally by fitting 24A and fixing the contact portions between the bulging portions 23B and the recessed portions 24A by welding or the like.

  Next, the right side surface 25A3 of the mounting plate portion 25A of the L-shaped ring 25 is brought into contact with the open end 24C of the fan ring 24, and the corresponding contact portion is fixed by welding or the like, whereby the L-shaped ring 25 and the fan are fixed. The ring 24 and the fixed frame member 23 can be assembled together. Thus, the fan shroud 22 according to the present embodiment can be assembled by assembling the three members of the fixed frame member 23, the fan ring 24, and the L-shaped ring 25 that are molded as separate members.

  Thus, according to the present embodiment, when the L-shaped ring 25 is manufactured, it is formed by bending a strip-shaped plate material cut out from the flat plate material without gaps into an L-shape. This can be omitted and the yield can be improved. Further, since the plate material bent into an L shape is formed into a cylindrical shape by roll bending, it is not necessary to perform press processing using an expensive mold, and the manufacturing cost can be reduced. Furthermore, by simply changing the length of the L-shaped plate material and the bending rate of the roll bending process, a plurality of types of L-shaped rings 25 (bell mouth portions) having different shapes such as diameter and length can be easily formed. can do.

  In addition, since the L-shaped ring 25 is molded as a cylindrical body having an L-shaped cross section by the mounting plate portion 25A and the bent plate portion 25B, the L-shaped ring 25 as a bell mouth portion can be easily molded. Can do. Further, by appropriately adjusting the length dimensions of the mounting plate portion 25A and the bent plate portion 25B, the intake sound and the air volume of the cooling air supplied to the heat exchanger 19 can be easily adjusted.

  In the above-described embodiment, the case where the fixed frame member 23, the fan ring 24, and the L-shaped ring 25 are formed of a metal material such as a steel plate has been described as an example. However, the present invention is not limited to this, and may be molded from, for example, a synthetic resin material or a rubber material.

  Further, in the above-described embodiment, the fixed frame member 23 is composed of the frame plate portion 23A and the four bulging portions 23B by using a thin plate-shaped steel plate material having an open central portion and using a bending apparatus or the like. The case where it is molded as a single body has been described as an example. However, the present invention is not limited to this. For example, the bulging portion may be formed of a separate member and fixed to the frame plate portion by welding or the like.

  In the above-described embodiment, the case where the engine 10 is provided as a prime mover and the cooling fan 20 attached to the engine 10 is rotationally driven via the endless belt 17 has been described as an example. However, the present invention is not limited to this, and the cooling fan may be separated from the engine, and the cooling fan may be rotationally driven by a power source such as an electric motor or a hydraulic motor.

  In the above-described embodiment, the case where the upper swing body 3 is applied to the cab specification hydraulic excavator 1 including the cab 6 has been described as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a canopy-type hydraulic excavator that covers at least the upper part of the driver's seat.

  Furthermore, in the above-described embodiment, the hydraulic excavator 1 has been described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to other construction machines such as a wheel loader, a hydraulic crane, and a bulldozer. May be.

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
10 engine (motor)
DESCRIPTION OF SYMBOLS 19 Heat exchanger 20 Cooling fan 22 Fan shroud 23 Fixed frame member 24 Fan ring 25 L-shaped ring 25A Mounting plate part 25B Bending plate part

Claims (2)

A vehicle body mounted with a prime mover and capable of self-running, a heat exchanger provided on the vehicle body for cooling the heated liquid, and a cooling fan disposed facing the heat exchanger and supplying cooling air to the heat exchanger And a fan shroud surrounding the outer peripheral side of the cooling fan,
The fan shroud includes a frame-shaped fixed frame member which is attached to the heat exchanger on one side in the length direction and opened on the other side in the length direction, and surrounds the outer peripheral side of the cooling fan, and one side in the length direction is the side. A cylindrical fan ring attached to the opening side of the fixed frame member and opened on the other side in the length direction is formed as a cylindrical body having an L-shaped cross section by roll bending an L-shaped plate material. A construction machine comprising: an intake sound of the cooling air that is attached to the opening side and supplied to the heat exchanger; and an L-shaped ring that adjusts the air volume.   The L-shaped ring includes an annular mounting plate portion having an outer diameter side attached to the opening end of the fan ring and an inner diameter side extending toward the cooling fan, and a bent portion bent in the length direction from the inner diameter side of the mounting plate portion. The construction machine according to claim 1, comprising a plate portion.

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