JP5329518B2 - Construction machinery - Google Patents

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 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 hydraulic excavator is positioned on the front side of the counter weight, which is provided on the rear end side of the swing frame for balancing the weight of the swing frame that forms the support structure, and the work device. An engine as a prime mover mounted on the revolving frame, a heat exchanger provided in the vicinity of the engine for cooling the heated liquid, and facing the heat exchanger and rotating with the engine as a power source And a cooling fan for supplying cooling air to the heat exchanger.

  In this case, the heat exchanger is composed of a radiator that cools the cooling water of the engine, an oil cooler that cools the hydraulic oil, etc., and the cooling fan rotates when the engine is operating, so that the cooling air is directed toward the heat exchanger. The liquid supplied and cooled, such as cooling water and hydraulic oil, can be cooled.

  On the other hand, a shroud that forms a cooling air passage is provided between the cooling fan and the heat exchanger on the outer peripheral side of the cooling fan that supplies the cooling air to the heat exchanger. Such a shroud is, for example, a heat exchanger side shroud provided on the heat exchanger side and having an opening, and a cylindrical fan side shroud (engine side) provided on the cooling fan side and surrounding the cooling fan from the outer peripheral side. And a cylindrical intermediate shroud (cylindrical rubber) that is provided between the heat exchanger side shroud and the fan side shroud and defines a cooling air passage (see, for example, Patent Document 1). ).

Japanese Patent Laid-Open No. 10-212955

  According to the prior art, the end of the cylindrical intermediate shroud is fitted to the outer peripheral surface of the fan-side shroud, and the inner peripheral surface of the end of the intermediate shroud is always in contact with the edge of the fan-side shroud. It is the composition to do. For this reason, for example, when the construction machine is operating, if the fan-side shroud attached to the engine is tilted with respect to the heat exchanger-side shroud as the engine swings, the edge of the fan-side shroud There is a possibility that the inner shroud may rub against the inner peripheral surface of the end. In this case, there is a problem that the inner peripheral surface of the end portion of the intermediate shroud formed of an elastic material such as rubber is worn and damaged, cooling air leaks from the portion, and cooling efficiency decreases.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a construction machine that can prevent the intermediate shroud from being worn and damaged, and can ensure cooling efficiency and improve reliability. It is said.

  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. A cooling fan that supplies cooling air to the heat exchanger, and a shroud that forms a cooling air passage between the cooling fan and the heat exchanger, the shroud being provided on the heat exchanger side and having an opening. A heat exchanger side shroud, a cylindrical fan side shroud that is provided on the cooling fan side and surrounds the cooling fan from the outer peripheral side, and is provided between the heat exchanger side shroud and the fan side shroud. The present invention is applied to a construction machine constituted by a cylindrical intermediate shroud that defines the cooling air passage.

The feature of the configuration adopted by the invention of claim 1 is that the intermediate shroud is attached to the heat exchanger side shroud, a contact portion that contacts the outer peripheral side of the fan side shroud over the entire circumference, possess an outer peripheral side a protruding portion abutting of the fan-side shroud when the fan-side shroud relative to the heat exchanger-side shroud provided in the vicinity of the contact portion is tilted, the protrusion of the intermediate shroud Is in a configuration projecting in the axial direction and located radially outside the contact portion .

  According to a second aspect of the present invention, the protrusion is configured by an inner protrusion protruding into the cooling air passage.

  According to a third aspect of the present invention, the protrusion includes an inner protrusion protruding into the cooling air passage and an outer protrusion protruding outward from the cooling air passage across the intermediate shroud. It is to have done.

  According to a fourth aspect of the present invention, the fan-side shroud is fixed to the prime mover at the base end side and extends so that the front end side is a free end and overlaps the intermediate shroud, and the axial intermediate portion is U-shaped or V-shaped. The configuration has a cross-sectional shape.

According to the first aspect of the present invention, the protrusion is provided in the vicinity of the contact portion of the intermediate shroud , that is, radially outwardly from the contact portion, so as to protrude in the axial direction . When the fan-side shroud is tilted, the protrusion comes into contact with the outer peripheral side of the fan-side shroud. Thereby, it can prevent that the edge part (edge) of a fan side shroud and an intermediate | middle shroud contact, and can prevent the leakage of the cooling air by wear and damage of an intermediate | middle shroud. As a result, it is possible to ensure cooling efficiency and improve reliability.

  According to the second aspect of the present invention, since the protrusion is constituted by the inner protrusion protruding into the cooling air passage, the end edge on the heat exchanger side of the fan-side shroud is intermediate by the inner protrusion. Contact with the inner peripheral surface of the end portion of the shroud can be prevented, and cooling efficiency can be ensured and reliability can be improved.

  According to the invention of claim 3, the protrusion is configured by an inner protrusion that protrudes into the cooling air passage and an outer protrusion that protrudes outside the cooling air passage across the intermediate shroud. Yes. For this reason, it can prevent that the edge part by the side of a heat exchanger among fan side shrouds contacts the inner peripheral surface of the edge part of an intermediate | middle shroud by an inner side projection part, and a heat exchanger among fan side shrouds by an outer side projection part. It is possible to prevent the end edge on the opposite side from contacting the outer peripheral surface of the end of the intermediate shroud. As a result, it is possible to further ensure cooling efficiency and improve reliability.

  According to the invention of claim 4, the projecting portion comes into contact with the outer peripheral side of the fan-side shroud having a U-shaped or V-shaped cross-section in the axial direction, so that the edge portion of the fan-side shroud is Contact with the intermediate shroud can be prevented, cooling efficiency can be ensured, and reliability can be improved.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. It is sectional drawing seen from the arrow II-II direction in FIG. 1 which shows an engine, a heat exchanger unit, a cooling fan, a shroud, etc. It is an expanded sectional view of the (III) part in Drawing 2 showing an engine, a heat exchanger unit, a cooling fan, a shroud, etc. It is a perspective view which shows a heat exchanger unit. It is a perspective view which shows an engine, a heat exchanger unit, a cooling fan, a shroud, etc. It is a perspective view equivalent to the (VI) part in Drawing 5 which shows a shroud etc. in the state where an intermediate shroud was cut. It is an expanded sectional view of the (VII) part in Drawing 3 showing a cooling fan, a shroud, etc. It is sectional drawing seen from the same direction as FIG. 7 which shows the state which the fan side shroud inclined with respect to the heat exchanger side shroud. It is sectional drawing similar to FIG. 7 which shows the cooling fan, shroud, etc. by the 2nd Embodiment of this invention. FIG. 10 is a cross-sectional view seen from the same direction as FIG. 9 showing a state in which the fan-side shroud is inclined with respect to the heat exchanger-side shroud. It is sectional drawing similar to FIG. 7 which shows the cooling fan, shroud, etc. by the 3rd Embodiment of this invention.

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

  1 to 8 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2 and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. The vehicle body is constituted by. A working device 4 is provided on the front side of the upper swing body 3 so as to be able to move up and down, and the working device 4 performs excavation work of earth and sand.

  Here, the upper swing body 3 includes a swing frame 5, a cab 6, a counterweight 7, an engine 8, a building cover 10, a heat exchanger unit 11, a cooling fan 18, a shroud 21, and the like which will be described later.

  Reference numeral 5 denotes a revolving frame constituting the upper revolving structure 3, and the revolving frame 5 is formed as a support structure. The revolving frame 5 is, as shown in FIGS. 2 and 5, etc., a bottom plate 5A made of a thick steel plate and the like extending in the front and rear directions, and standing on the bottom plate 5A and predetermined in the left and right directions. Left center beam 5B and right center beam 5C extending in the forward and rearward directions with a spacing of, and left side frame 5D extending in the forward and rearward directions, spaced apart on the left and right of each of the center beams 5B and 5C. A right side frame 5E, a plurality of extended beams 5F supporting the left and right side frames 5D and 5E, and a bottom plate 5A and the side are extended from the bottom plate 5A and the center beams 5B and 5C in the left and right directions. It is roughly constituted by a plurality of undercovers 5G provided between the frames 5D and 5E. The working device 4 is attached to the front side of the center beams 5B and 5C so as to be able to move up and down.

  The revolving frame 5 is provided with a mounting bracket 5H that is located at the left rear portion and extends in the front and rear directions. The mounting bracket 5H is, as shown in FIGS. The lower bracket 14 and the like are attached. Here, the mounting bracket 5H is made of, for example, a steel material having a U-shaped cross section, and its end is fixed to the overhanging beam 5F positioned at the front and rear by using welding means or the like.

  Reference numeral 6 denotes a cab (see FIG. 1) mounted on the left front side of the revolving frame 5. The cab 6 is used by an operator. Inside the cab 6, a driver's seat on which an operator is seated, various operation levers, an indoor unit of an air conditioner, and the like (all not shown) are arranged.

  Reference numeral 7 denotes a counterweight (see FIG. 1) attached to the rear end portion of the revolving frame 5. The counterweight 7 is formed as a heavy object and balances the weight with the work device 4.

  Reference numeral 8 denotes an engine as a prime mover that is located on the front side of the counterweight 7 and is mounted on the turning frame 5. Here, the engine 8 is arranged in a horizontally placed state in which the axis of the crankshaft 8A extends leftward and rightward, and its four corners are attached to the revolving frame 5 via vibration-proof mounts 8B. The engine 8 has a water jacket (not shown) through which engine cooling water circulates, and the water jacket is connected to a radiator 15A described later that releases heat of the cooling water.

  A drive pulley 8C is attached to the end of the crankshaft 8A of the engine 8. The rotation of the drive pulley 8C is transmitted to a driven pulley 8E via an endless belt 8D called a V belt, and a cooling fan 18 (described later) attached to the driven pulley 8E rotates.

  On the left side (cooling fan 18 side) of the engine 8, a fan-side shroud 24, which will be described later, is attached via a plurality of (for example, three) brackets 8F. Each bracket 8F is provided with a fan guard 8G (see FIG. 5) for preventing the cooling fan 18 from being caught.

  Reference numeral 9 denotes a hydraulic pump attached to the right side of the engine 8, and the hydraulic pump 9 is driven by the engine 8 to discharge hydraulic oil as pressure oil toward the work device 4 and the like. Further, the hydraulic oil returned from the working device 4 or the like can be cooled by circulating an oil cooler 15B described later.

  A building cover 10 is provided between the cab 6 and the counterweight 7 and is provided on the revolving frame 5. As shown in FIGS. 1 and 2, etc., the building cover 10 includes left and right side plates 10A and 10B that are positioned on both the left and right sides of the revolving frame 5 and extend in the front and rear directions. The upper plate 10C extending in the horizontal direction between the upper ends of the face plates 10A and 10B and an engine cover 10D covering the opening 10C1 of the upper plate 10C are roughly configured. In addition, the left side plate 10A of the building cover 10 is formed with an inlet 10E through which cooling air F to be supplied to a heat exchanger 15 to be described later flows, and the right side plate 10B receives the cooling air F that has passed through the engine 8 or the like. An outflow port 10 </ b> F that flows out to the outside is formed.

  A heat exchanger unit 11 is provided on the left side of the engine 8 so as to face a cooling fan 18 described later. The heat exchanger unit 11 includes a support frame 12, an upper bracket 13, a lower bracket 14, and a heat It is comprised by the exchanger 15 grade | etc.,.

  Reference numeral 12 denotes a support frame that forms a frame structure of the heat exchanger unit 11. The support frame 12 includes a heat exchanger 15 that will be described later on the left rear portion of the swivel frame 5, and a heat exchanger side shroud 23 that will be described later. It constitutes. Here, as shown in FIGS. 2, 4, 5, and the like, the support frame body 12 includes side plates 12 </ b> A and 12 </ b> B that face each other in parallel with a predetermined interval in the front and rear directions of the upper swing body 3. A long box-like connecting member 12C that extends in the front and rear direction so as to connect the upper portions of the side plates 12A and 12B and covers the upper portion of the heat exchanger 15, and the downstream sides of the side plates 12A and 12B and the connecting members 12C ( The heat exchanger side shroud 23, which will be described later, is generally constituted by the side plates 12A and 12B and the connecting member 12C that are located on the engine 8 side) and are integrally provided.

  On the upstream side of the support frame 12, a reinforcing member 12D for increasing the strength while allowing the cooling air F to flow is attached so as to straddle the side plates 12A and 12B. Further, bolt insertion holes 12E (see FIG. 4) for bolting the side plates 12A and 12B to the overhanging beam 5F are provided on the lower ends of the side plates 12A and 12B. Further, a mounting plate 12F (see FIG. 2) for supporting a capacitor 15C and the like which will be described later is attached to the central portion of each of the side plates 12A and 12B so as to bridge between the side plates 12A and 12B.

  Reference numeral 13 denotes an upper bracket positioned on the lower surface side of the connecting member 12C and extending in the front and rear directions of the upper swing body 3, and the upper bracket 13 is formed of, for example, a steel material having a substantially L-shaped cross section bent upward. Yes. Here, the upper bracket 13 fixes an upper end portion of a heat exchanger 15 to be described later to the support frame body 12. For this purpose, the upper bracket 13 has an upper end portion of a radiator 15A constituting the heat exchanger 15 and an upper end portion of an oil cooler 15B attached in parallel in the length direction (front and rear directions) of the upper bracket 13. Yes. The upper bracket 13 is attached to the connecting member 12C of the support frame 12 by screwing.

  Reference numeral 14 denotes a lower bracket which is located below the upper bracket 13 and extends in the front and rear directions. The lower bracket 14 is formed of, for example, a steel material having a substantially L-shaped cross section bent at the lower side. Here, the lower bracket 14 fixes the lower end portion of the heat exchanger 15 to the support frame body 12 and fixes the heat exchanger 15 and the support frame body 12 to the mounting bracket 5H of the revolving frame 5. is there. For this purpose, the lower bracket 14 has a lower end portion of the radiator 15 </ b> A constituting the heat exchanger 15 and a lower end portion of the oil cooler 15 </ b> B attached in parallel in the length direction of the lower bracket 14. The lower bracket 14 is attached to the lower end sides of the side plates 12A and 12B of the support frame 12 by screws at both ends in the length direction (front and rear directions), and the lower end side of the revolving frame 5 It is attached to the upper surface of the mounting bracket 5H by screws.

  Reference numeral 15 denotes a heat exchanger disposed inside the support frame 12, and the heat exchanger 15 cools a heated fluid such as engine coolant or hydraulic oil. Here, the heat exchanger 15 is attached to the support frame 12 via the upper bracket 13 and the lower bracket 14 and the radiator 15A and the oil cooler 15B, and is attached to the support frame 12 via the attachment plate 12F. The capacitor 15C and the like.

  The radiator 15 </ b> A cools the heated engine cooling water by radiating the heat of the engine cooling water circulating between it and the water jacket of the engine 8 into the cooling air F. The oil cooler 15B is heated by dissipating the heat of the hydraulic oil (return oil) circulating from the various hydraulic actuators mounted on the hydraulic excavator 1 to the hydraulic oil tank (not shown) into the cooling air F. The hydraulic oil is cooled. The condenser 15 </ b> C cools the heated refrigerant by radiating the heat of the refrigerant (compressed refrigerant) used in the air conditioner provided in the cab 6 into the cooling air F.

  Reference numeral 16 denotes a reservoir tank attached to the side plate 12A of the support frame 12, and the reservoir tank 16 stores engine cooling water to be replenished to the radiator 15A. Reference numeral 17 denotes a dustproof net that covers the upstream side of the radiator 15A and the oil cooler 15B. The dustproof net 17 is detachably attached to the upper and lower brackets 13 and 14, respectively.

  Reference numeral 18 denotes a suction-type cooling fan disposed to face the heat exchanger 15, and the cooling fan 18 is attached to a driven pulley 8 </ b> E of the engine 8. The cooling fan 18 is driven to rotate by using the engine 8 as a power source, thereby sucking outside air into the building cover 10 and using the outside air as cooling air F, the radiator 15A, the oil cooler 15B, and the condenser 15C of the heat exchanger 15. Etc.

  Next, the shroud 21 for adjusting the flow of the cooling air F will be described.

  That is, 21 is a shroud provided between the cooling fan 18 and the heat exchanger 15, and the shroud 21 forms a cooling air passage 22 between the cooling fan 18 and the heat exchanger 15. Here, the shroud 21 is roughly constituted by a heat exchanger side shroud 23, a fan side shroud 24, and an intermediate shroud 25.

  23 is a heat exchanger side shroud provided on the heat exchanger 15 side, and the heat exchanger side shroud 23 is a part of the support frame 12 of the heat exchanger unit 11 that is on the downstream side of the heat exchanger 15. It is comprised by. Here, the heat exchanger side shroud 23 has a box shape protruding from the radiator 15A and the oil cooler 15B to the cooling fan 18 side, and an opening 23A is formed on a surface facing the cooling fan 18.

  Around the opening 23A, a cylindrical mounting tube portion 23B protruding toward the engine 8 is provided, and an intermediate shroud 25 described later is mounted on the mounting tube portion 23B. Further, as shown in FIG. 4, a plurality of (for example, 10 to 15) heat exchanger side engagement pieces 23C are fixed to the outer peripheral surface of the mounting cylinder portion 23B at equal intervals in the circumferential direction by welding or the like. Configuration in which the intermediate shroud 25 is prevented from being displaced in the circumferential direction with respect to the heat exchanger side shroud 23 by engagement (contact) of the heat exchanger side engaging piece 23C and an intermediate shroud side engaging piece 26C described later. It has become.

  Reference numeral 24 denotes a fan-side shroud provided on the cooling fan 18 side. The fan-side shroud 24 is configured as a cylindrical body having a substantially U-shaped cross-section surrounding the cooling fan 18 from the outer peripheral side. Here, the fan-side shroud 24 is fixed to the engine 8 at the base end side, as shown in FIGS. That is, the fan-side shroud 24 is provided with a plurality of mounting pieces 24B projecting radially outward from the outer peripheral surface 24A, and each of the mounting pieces 24B is attached to a bracket 8F provided on the engine 8 using bolts 24C. The fan-side shroud 24 is fixed to the engine 8. Further, as shown in FIG. 7 and the like, the fan-side shroud 24 extends so that the front end side is a free end and overlaps an intermediate shroud 25 described later, and the axial intermediate portion 24D has a substantially U-shaped cross-sectional shape. The outer peripheral surface 24A is a concave curved curved surface that expands toward both ends in the axial direction.

  A cylindrical intermediate shroud 25 is provided between the heat exchanger side shroud 23 and the fan side shroud 24 to define the cooling air passage 22. The intermediate shroud 25 is formed using an elastic material such as rubber, for example. It is made of a cylindrical body. Here, the intermediate shroud 25 is roughly constituted by a mounting portion 26, which will be described later, an intermediate cylindrical portion 27, an inward flange portion 28, a contact portion 29, and an inner projection portion 30.

  Reference numeral 26 denotes an attachment portion that is attached to the attachment cylinder portion 23B of the heat exchanger side shroud 23. The attachment portion 26 has a substantially U-shaped cross section in which a groove 26A around which a binding band 31 to be described later is wound is provided. It is formed as a ring-shaped body. Further, an inner side surface 26B that rises radially outward from the outer peripheral surface of the mounting cylinder portion 23B of the heat exchanger side shroud 23 in the mounting portion 26 has a plurality of intermediate portions protruding from the inner side surface 26B toward the engine 8 side. A shroud side engaging piece 26C is provided corresponding to the heat exchanger side engaging piece 23C. As shown in FIG. 6 and the like, each intermediate shroud side engaging piece 26C is integrally formed on the inner side surface 26B of the mounting portion 26 as a substantially cubic shaped projecting piece, and is connected to the end surface of the heat exchanger side engaging piece 23C. By abutting in the direction, the intermediate shroud 25 is prevented from being displaced in the circumferential direction as the engine 8 swings.

  Here, the intermediate shroud side engaging piece 26C shown in FIG. 6 and the like is configured to abut on the end surface of the heat exchanger side engaging piece 23C on one side in the circumferential direction (clockwise as viewed from the engine 8 side). ing. However, for example, another intermediate shroud side engagement piece (not shown) is configured to abut on the end surface of the other heat exchanger side engagement piece on the other circumferential side (counterclockwise side when viewed from the engine 8 side), Even if the intermediate shroud 25 tends to be displaced in any of the circumferential directions (clockwise or counterclockwise), the displacement can be prevented.

  Reference numeral 27 denotes an intermediate cylinder portion extending from the edge of the attachment portion 26 toward the engine 8, and the intermediate cylinder portion 27 includes a longitudinally curved portion 27 </ b> A protruding radially outward and an engine 8 side as shown in FIG. 7 and the like. It is formed as a substantially cylindrical tubular body having a laterally curved portion 27B that protrudes toward and a cylindrical portion 27C that continues the longitudinally curved portion 27A and the laterally curved portion 27B.

  Reference numeral 28 denotes an inward flange portion extending radially inward from the edge of the intermediate cylinder portion 27, and the inward flange portion 28 extends from the edge of the intermediate cylinder portion 27 toward the outer peripheral surface 24 </ b> A of the fan-side shroud 24. The inner side surface 28 </ b> A faces the heat exchanger 15, and the outer side surface 28 </ b> B faces the engine 8.

  Reference numeral 29 denotes a contact portion provided on the front end side of the inward flange portion 28, and the contact portion 29 contacts the outer peripheral surface 24 </ b> A of the fan-side shroud 24 over the entire circumference. Here, the contact portion 29 is fitted to the outer peripheral surface 24 </ b> A of the fan-side shroud 24 with a predetermined allowance (by an interference fit), thereby improving the adhesion (sealing property) between the contact portion 29 and the fan-side shroud 24. Secured. Accordingly, for example, as shown in FIG. 8, even when the fan-side shroud 24 is inclined with respect to the heat exchanger-side shroud 23 as the engine 8 swings, the cooling air F is prevented from leaking from the contact portion 29. Yes.

  Reference numeral 30 denotes an inner protrusion as a protrusion provided in the vicinity of the contact portion 29, and the inner protrusion 30 is located radially outside the contact portion 29 in the inward flange portion 28 and is located in the cooling air passage 22. Are formed so as to protrude over the entire circumference. Here, the inner protruding portion 30 protrudes in the axial direction from the inner side surface 28A of the inward flange portion 28 toward the heat exchanger 15 side, and as shown in FIG. A curved surface 30B that smoothly curves from the inner diameter side edge of the distal end surface 30A toward the contact portion 29, and an outer peripheral surface 30C that extends from the outer diameter side edge of the distal end surface 30A toward the engine 8 side in a substantially perpendicular direction. It is formed as an annular projection having.

  As shown in FIG. 8, when the fan-side shroud 24 is tilted with respect to the heat exchanger-side shroud 23 as the engine 8 swings during operation, the inner protrusion 30 is formed on the fan-side shroud 24. By contacting the outer peripheral surface 24 </ b> A, the edge 24 </ b> E of the fan-side shroud 24 is prevented from contacting the intermediate shroud 25.

  31 is a binding band that presses the mounting portion 26 of the intermediate shroud 25 against the mounting tube portion 23B of the heat exchanger side shroud 23. The binding band 31 is formed of, for example, a synthetic resin material, and is a clamp located on the proximal end side. It consists of a part 31A and an elongated belt-like part 31B having flexibility extending from the clamp part 31A, and the belt-like part 31B is inserted into the clamp part 31A in a retaining state.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, the operator can move the hydraulic excavator 1 forward or backward by the lower traveling body 2 by getting on the cab 6 and operating an operation lever for traveling. Further, by operating an operation lever for work (both not shown), the work device 4 can be moved up and down to perform soil excavation work and the like.

  When the hydraulic excavator 1 is in operation, air is introduced from the inlet 10E of the building cover 10 by the cooling fan 18 driven by the engine 8, and this air is used as cooling air F for the heat exchanger 15 (radiator 15A, oil cooler). 15B, condenser 15C, etc.), each fluid to be cooled can be cooled. The cooling air F that has passed through the heat exchanger 15 is guided to the engine 8 side through the shroud 21 (heat exchanger side shroud 23, intermediate shroud 25, fan side shroud 24), and the engine 8, hydraulic pump 9, etc. It flows out from the outlet 10F through the surroundings.

  By the way, when the engine 8 swings with respect to the revolving frame 5 as the excavator 1 travels, excavates, etc., for example, as shown in FIG. 8, the fan-side shroud 24 fixed to the engine 8 becomes a heat exchanger. The side shroud 23 may be inclined.

  In this case, in the present embodiment, the inner shroud 25 is provided with the inner protrusion 30. Therefore, even if the fan-side shroud 24 is inclined with respect to the heat exchanger-side shroud 23 as the engine 8 swings, as shown in FIG. 8, the inner side provided near the contact portion 29 of the intermediate shroud 25. The protrusion 30 contacts the outer peripheral surface 24 </ b> A of the fan-side shroud 24.

  Accordingly, the inner protrusion 30 can prevent the end edge 24E of the fan-side shroud 24 and the intermediate shroud 25 from directly contacting each other, and the leakage of the cooling air F due to wear and damage of the intermediate shroud 25 can be prevented. Can do. As a result, it is possible to ensure cooling efficiency and improve reliability.

  Next, FIG. 9 and FIG. 10 show a second embodiment of the present invention. The feature of this embodiment is that an intermediate protrusion and an outer protrusion are provided on the intermediate shroud. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 41 is a cylindrical intermediate shroud provided between the heat exchanger side shroud 23 and the fan side shroud 24 to define the cooling air passage 22, and the intermediate shroud 41 is the first embodiment described above. Like the intermediate shroud 25 of the form, it is made of a cylindrical body formed using an elastic material such as rubber. Here, the intermediate shroud 41 is roughly constituted by a mounting portion 42 described later, an intermediate cylinder portion 43, an inward flange portion 44, a contact portion 45, an inner protrusion portion 46, and an outer protrusion portion 47.

  Reference numeral 42 denotes an attachment portion that is attached to the attachment cylinder portion 23B of the heat exchanger side shroud 23. The attachment portion 42 has a substantially U-shaped cross section in which a concave groove 42A around which the binding band 31 is wound is provided. It is formed as an annular body. Further, an inner side surface 42B that rises radially outward from the outer peripheral surface of the mounting cylinder portion 23B of the heat exchanger side shroud 23 of the mounting portion 42 has a plurality of intermediate portions protruding from the inner side surface 42B toward the engine 8 side. A shroud side engaging piece 42C is provided corresponding to the heat exchanger side engaging piece 23C.

  43 is an intermediate cylinder part extending from the edge of the attachment part 42 toward the engine 8 side. The intermediate cylinder part 43 includes a longitudinally curved part 43A projecting radially outward and a laterally curved part 43B projecting toward the engine 8 side. And a substantially cylindrical body having a cylindrical portion 43C that is continuous with the longitudinally curved portion 43A and the laterally curved portion 43B.

  44 is an inward flange portion extending radially inward from the end edge of the intermediate cylinder portion 43, and the inward flange portion 44 extends from the end edge of the intermediate cylinder portion 43 toward the outer peripheral surface 24 </ b> A of the fan-side shroud 24. The inner side surface 44 </ b> A faces the heat exchanger 15, and the outer side surface 44 </ b> B faces the engine 8.

  Reference numeral 45 denotes a contact portion provided on the distal end side of the inward flange portion 44, and the contact portion 45 contacts the outer peripheral surface 24 </ b> A of the fan-side shroud 24 over the entire circumference. Here, the contact portion 45 is fitted to the outer peripheral surface 24 </ b> A of the fan-side shroud 24 with a predetermined tightening allowance (by an interference fit), thereby improving the adhesion (sealing property) between the contact portion 45 and the fan-side shroud 24. Secured.

  46 is an inner protrusion as a protrusion provided in the vicinity of the contact portion 45, and the inner protrusion 46 is located radially outside the contact portion 45 in the inward flange portion 44 and is located in the cooling air passage 22. Are formed so as to protrude over the entire circumference. Here, the inner protruding portion 46 protrudes in the axial direction from the inner side surface 44A of the inward flange portion 44 toward the heat exchanger 15 side. And the inner side protrusion part 46 is a fan side with respect to the heat exchanger side shroud 23 with the rocking | fluctuation of the engine 8 at the time of operation similarly to the inner side protrusion part 30 by 1st Embodiment shown in FIG. 8 mentioned above. When the shroud 24 is tilted, it contacts the outer peripheral surface 24A of the fan-side shroud 24. Thereby, the edge 24 </ b> E on the heat exchanger 15 side of the fan-side shroud 24 can be prevented from contacting the intermediate shroud 41.

  Reference numeral 47 denotes an outer protrusion as a protrusion provided in the vicinity of the contact portion 45, and the outer protrusion 47 is located on the radially outer side of the contact portion 45 in the inward flange portion 44. Is formed so as to protrude over the entire circumference on the opposite side, that is, on the outside opposite to the cooling air passage 22 with the inward flange portion 44 interposed therebetween. That is, the outer protrusion 47 protrudes from the outer surface 44B of the inward flange portion 44 toward the engine 8 over the entire circumference in the axial direction.

  As shown in FIG. 10, when the fan-side shroud 24 is tilted with respect to the heat exchanger-side shroud 23 as the engine 8 swings during operation, the outer protrusion 47 is an outer peripheral surface of the fan-side shroud 24. It is in contact with 24A. Thereby, the edge part by the side of the engine 8 among the fan side shrouds 24, the edge part 24B1 of the attachment piece 24B, etc. can be prevented from coming into contact with the intermediate shroud 41.

  The hydraulic excavator 1 according to the present embodiment defines the cooling air passage 22 by the intermediate shroud 41 as described above, and the basic action thereof is not particularly different from that according to the first embodiment described above. .

  That is, according to the present embodiment, when the engine 8 swings as the excavator 1 travels, excavates, and the like, and the fan-side shroud 24 tilts with respect to the heat exchanger-side shroud 23, the inner projection The portion 46 and the outer protrusion 47 are in contact with the outer peripheral surface 24 </ b> A of the fan-side shroud 24. In this case, the inner protrusion 46 can prevent the edge 24 </ b> E on the heat exchanger 15 side of the fan-side shroud 24 from coming into contact with the inner peripheral surface of the end of the intermediate shroud 41. Further, due to the outer protrusion 47, the edge of the fan-side shroud 24 on the side opposite to the heat exchanger 15 (engine 8 side), the edge 24 B 1 of the mounting piece 24 B, etc. are the outer peripheral surface of the end of the intermediate shroud 41. Can be prevented from contacting. As a result, it is possible to further ensure cooling efficiency and improve reliability.

  Next, FIG. 11 shows a third embodiment of the present invention. The feature of this embodiment is that the cross-sectional shape of the middle part of the fan-side shroud is formed in a substantially V shape. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 51 denotes a fan-side shroud provided on the cooling fan 18 side, and the fan-side shroud 51 is configured as a substantially V-shaped cylindrical body that surrounds the cooling fan 18 from the outer peripheral side. Here, the base end side of the fan-side shroud 51 is fixed to the engine 8. That is, the fan-side shroud 51 is provided with a plurality of mounting pieces 51B protruding radially outward from the outer peripheral surface 51A, and these mounting pieces 51B are attached to a bracket 8F provided on the engine 8 by using bolts 51C. The fan-side shroud 51 is fixed to the engine 8.

  Further, the fan-side shroud 51 extends so that the front end side is a free end and overlaps the intermediate shroud 25, and the axial intermediate portion 51D is substantially V-shaped inclined in a direction of increasing the diameter toward both axial ends. The cross-sectional shape is as follows. When the fan-side shroud 51 is tilted with respect to the heat exchanger-side shroud 23 as the engine 8 swings, the inner protrusion 30 ′ of the intermediate shroud 25 contacts the outer peripheral surface 51 A of the fan-side shroud 51. It is the structure which touches. Note that the inner protrusion 30 according to the first embodiment shown in FIG. 7 is formed in a substantially mountain shape (substantially Mt. Fuji shape) in cross section, whereas the inner protrusion portion of the present embodiment. 30 'is formed in a substantially mushroom shape in which the cross-sectional shape is thin on the base end side and bulges on the front end side.

  The hydraulic excavator 1 according to the present embodiment forms the cooling air passage 22 by the fan-side shroud 51 as described above, and the basic action thereof is not particularly different from that according to the first embodiment described above. .

  That is, even in the case of the present embodiment, even if the engine 8 swings as the hydraulic excavator 1 travels and excavates, and the fan-side shroud 51 tilts with respect to the heat exchanger-side shroud 23, the intermediate shroud An inner protrusion 30 ′ provided in the vicinity of the 25 contact portions 29 contacts the outer peripheral surface 51 A of the fan-side shroud 51. Thereby, it is possible to prevent the edge 51 </ b> E of the fan-side shroud 51 and the intermediate shroud 25 from coming into direct contact by the inner protrusion 30 ′, thereby preventing the cooling air F from leaking due to wear and damage of the intermediate shroud 25. be able to. As a result, it is possible to ensure cooling efficiency and improve reliability.

  In the above-described embodiment, the substantially U-shaped or V-shaped cross section in which the intermediate portions 24D and 51D of the fan-side shrouds 24 and 51 are curved or inclined in the direction of increasing the diameter toward both ends in the axial direction. The case of having a shape has been described as an example. However, the present invention is not limited to this. For example, the intermediate portion of the fan-side shroud may have a substantially I-shaped cross-sectional shape (cylindrical outer peripheral surface) whose outer diameter does not change in the axial direction.

  In the above-described embodiment, the case where the engine 8 is provided as the prime mover and the cooling fan 18 attached to the engine 8 is rotationally driven via the endless belt 8D 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 another drive source such as an electric motor or a hydraulic motor.

  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)
8 engine (motor)
DESCRIPTION OF SYMBOLS 11 Heat exchanger unit 15 Heat exchanger 15A Radiator 15B Oil cooler 15C Condenser 18 Cooling fan 21 Shroud 22 Cooling air passage 23 Heat exchanger side shroud 24, 51 Fan side shroud 24D, 51D Intermediate part 25, 41 Intermediate shroud 26, 42 Mounting part 29, 45 Contact part 30, 30 ', 46 Inner protrusion (protrusion)
47 Outer protrusion (protrusion)

Claims (4)

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 shroud that forms a cooling air passage between the cooling fan and the heat exchanger,
The shroud is provided on the heat exchanger side and has a heat exchanger side shroud having an opening, a cylindrical fan side shroud provided on the cooling fan side and surrounding the cooling fan from the outer peripheral side, and the heat exchange In a construction machine configured by a cylindrical intermediate shroud provided between a vessel side shroud and the fan side shroud and defining the cooling air passage,
The intermediate shroud is attached to the heat exchanger-side shroud, a contact portion that contacts the entire outer periphery of the fan-side shroud, and a heat exchanger-side shroud provided near the contact portion. possess an outer peripheral side a protruding portion abutting of the fan-side shroud when tilted the fan-side shroud for,
The construction machine according to claim 1, wherein the projecting portion of the intermediate shroud is positioned radially outward from the contact portion and protrudes in the axial direction .   The construction machine according to claim 1, wherein the protrusion is configured by an inner protrusion that protrudes into the cooling air passage.   The projecting portion is configured by an inner projecting portion projecting into the cooling air passage and an outer projecting portion projecting outside opposite to the cooling air passage with the intermediate shroud interposed therebetween. The construction machine according to 2.   The fan-side shroud is configured such that a base end side is fixed to the prime mover, a front end side is a free end, extends so as to overlap the intermediate shroud, and an axial intermediate portion has a U-shaped or V-shaped cross-sectional shape. The construction machine according to claim 1, 2, or 3.

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