JP5631840B2 - 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 includes, for example, a heat exchanger side shroud provided on the heat exchanger side and having an opening, and a cylindrical fan ring (engine side shroud 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 ring and defines a cooling air passage (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-212955

  According to the prior art, both ends of the cylindrical intermediate shroud are fitted to the outer peripheral surface of the heat exchanger side shroud and the outer peripheral surface of the fan ring, and a heat exchanger is wound around the outer peripheral side by winding a fastening band. It is configured to be fixed to the container side shroud and the fan ring. In such a configuration, the following problems may occur.

  The engine attached to the swivel frame via the vibration-proof mount vibrates and swings with respect to the swivel frame as the hydraulic excavator travels or excavates. At this time, for example, the intermediate shroud may be displaced (rotated) in the circumferential direction with respect to the fan ring, and the inner peripheral surface of the end portion of the intermediate shroud may rub against the outer peripheral surface of the end portion of the fan ring. Accordingly, there is a problem that the inner peripheral surface of the end portion on the fan ring side of the intermediate shroud is worn and damaged, the cooling air leaks from the portion, and the cooling efficiency is lowered.

  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 preventing wear and damage of an intermediate shroud, ensuring cooling efficiency, and improving reliability. .

  In order to solve the above-mentioned problems, the present invention provides a self-propelled vehicle body, a heat exchanger that is provided on the vehicle body and cools a heated liquid, and is disposed to face the heat exchanger. A cooling fan that supplies cooling air, 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 a fan ring that is provided on the cooling fan side and surrounds the cooling fan from the outer peripheral side, and has a flexible fixed end that is fixed to the heat exchanger side shroud, and the other end is a free end. Thus, the present invention is applied to a construction machine constituted by a cylindrical intermediate shroud that is a seal portion that elastically contacts the fan ring.

A feature of the configuration adopted by the invention of claim 1 is that a groove member that extends along the circumferential direction of the fan ring and that restricts the movement of the seal portion of the intermediate shroud is provided on the outer circumferential surface of the fan ring in the circumferential direction. A plurality of groove members each having an attachment portion attached to the outer peripheral surface of the fan ring, and a receiving surface portion bent in a V shape from the attachment portion to receive the seal portion of the intermediate shroud. constituted by, nest surface of each channel member, said inclined toward the groove bottom of the groove member radially outwardly of the fan ring is formed as a flat surface extending, nest surface portion of the front Kimizo member , said formed the longitudinal ends of the nest area extending in the circumferential direction of the fan ring bent in an arc shape, the contact surface pressure decreasing to reduce the contact surface pressure of the sealing portion with respect to the nest surface In the configuration of providing a part .

Other invention of claim 2, the seal portion of the front Symbol intermediate shroud, to reduce the contact surface pressure of the seal portion against the nest surface is formed as a flat surface that comes in surface contact with a nest surface consisting of the flat surface it is configured to provide a contact surface pressure reduction unit.

According to the first aspect of the present invention, the intermediate shroud is displaced (rotated) in the circumferential direction with respect to the fan ring by vibration, swinging, etc. of the engine mounted on the construction machine, and the seal portion of the intermediate shroud and the receiving of the groove member are received. Even if the bearing surface rubs against each other, the receiving surface portion of each groove member is formed as a flat surface extending obliquely from the groove bottom portion of the groove member toward the radially outer side of the fan ring. Is a contact surface pressure reducing portion that is formed by bending both ends in the longitudinal direction of the receiving surface portion extending in the circumferential direction of the fan ring into an arc shape, and reduces the contact surface pressure of the seal portion with respect to the receiving surface portion. Therefore, the seal portion of the intermediate shroud can be prevented from biting into the edge of the receiving surface portion, and the contact surface pressure of the seal portion with respect to the receiving surface portion can be reduced. As a result, it is possible to prevent the seal portion from being worn out and damaged, and cooling air from leaking from the damaged portion to reduce the cooling efficiency, thereby improving the reliability of the construction machine.
That is, according to the first aspect of the present invention, the arc portions provided at both ends in the longitudinal direction of the receiving surface portion of the groove member are in surface contact with the seal portions of the intermediate shroud. The contact surface pressure can be reduced. As a result, it is possible to reduce the seal portion from biting into the edge of the receiving surface portion. Thereby, the wear and damage of the seal portion can be suppressed, and the cooling efficiency can be maintained appropriately.

According to the invention of claim 2, the seal portion of the shroud between the middle is formed as a flat surface in surface contact with the nest surface consisting of said flat surface to reduce the contact surface pressure of the sealing portion with respect to the nest surface Since another contact surface pressure reduction part is provided , the contact surface part (other contact surface pressure reduction part) of the seal part is in surface contact with the receiving surface part of the groove member, and both ends of the receiving surface part are arcuate. The contact surface pressure reducing portion formed by bending the contact portion makes surface contact with the seal portion. As a result, the contact surface pressure between the seal portion and the receiving surface portion can be further reduced, and the cooling efficiency can be properly maintained over a long period of time by reliably preventing the wear and damage of the seal portion. This can further improve the reliability of the construction machine.

It is a front view which shows the hydraulic excavator by the reference example used as the premise of this 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, etc. It is an expanded sectional view of the (III) part in Drawing 2 showing an engine, a heat exchanger unit, a cooling fan, etc. It is a disassembled perspective view which shows a cooling fan, a fan ring, a heat exchanger unit, an intermediate shroud, etc. It is a disassembled perspective view which shows a fan ring, a groove member, etc. It is a cut perspective view showing an intermediate shroud alone. It is a disassembled perspective view which cut | disconnects and shows the state before inserting an intermediate | middle shroud in the groove member by the reference example of this invention . FIG. 5 is a cut perspective view showing a state in which an intermediate shroud is fitted in the groove member. It is sectional drawing seen from the arrow IX-IX direction in FIG. 8 which shows a fan ring, an intermediate | middle shroud, and a groove member. It is a disassembled perspective view which cut | disconnects and shows the state before inserting an intermediate | middle shroud in the groove member by 1st Embodiment. FIG. 5 is a cut perspective view showing a state in which an intermediate shroud is fitted in the groove member. It is a perspective view which shows a groove member alone. It is a disassembled perspective view which cut | disconnects and shows the state before inserting an intermediate | middle shroud in the groove member by 2nd Embodiment. It is a cutting perspective view showing the state where the middle shroud was inserted in the groove member by a 2nd embodiment.

  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 the construction machine is applied to a hydraulic excavator.

FIGS. 1-9 has shown the reference example used as the premise of this 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 16, a shroud 17, and the like which will be described later.

  Reference numeral 5 denotes a revolving frame serving as a base of the upper revolving structure 3, and the revolving frame 5 is formed as a support structure. Then, as shown in FIG. 2, the revolving frame 5 is erected on a bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions, and on the bottom plate 5A, and is moved forward at a predetermined interval in the left and right directions. The left center beam 5B and the right center beam 5C extending in the rearward direction, and the left side frame 5D and the right side frame 5E extending in the forward and rearward directions are arranged with a space on the left and right of the center beams 5B and 5C. And a plurality of extended beams 5F that support the left and right side frames 5D and 5E at the front end portions thereof, and the bottom plate 5A and the side frames 5D and 5E from the bottom plate 5A and the center beams 5B and 5C. And a plurality of undercovers 5G provided between the two. 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 bracket 13 or the like is 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 mounted on the turning frame 5 that is located on the front side of the counterweight 7. Here, the engine 8 is disposed in a horizontally placed state in which the axis of the crankshaft 8A extends leftward and rightward, and is attached to the revolving frame 5 via a vibration-proof mount 8B. Further, the engine 8 has a water jacket (not shown) through which engine cooling water circulates, and the water jacket is connected to a radiator 14A 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 16 (described later) attached to the driven pulley 8E rotates.

  On the left side (cooling fan 16 side) of the engine 8, a fan ring 20 described later is attached via a plurality of (for example, three) brackets 8F. Each bracket 8F is provided with a fan guard (not shown) for preventing the cooling fan 16 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 14B 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 14 (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 16 to be described later. The heat exchanger unit 11 includes a support frame 12, a bracket 13, a heat exchanger 14 and the like which will be described later. Has been.

  Reference numeral 12 denotes a support frame that forms a frame structure of the heat exchanger unit 11, and the support frame 12 supports a heat exchanger 14 to be described later on the left rear portion of the revolving frame 5. Here, as shown in FIGS. 2 to 4 and the like, the support frame 12 includes side plates 12A and 12B that face in parallel in the front and rear directions of the upper swing body 3 at a predetermined interval, and the side plates 12A. , 12B extending forward and rearward so as to connect the upper parts of the heat exchanger 14 and connecting the upper part of the heat exchanger 14 to the engine 8 side of the side plates 12A, 12B and the connecting members 12C. The heat exchanger side shroud 19 which will be described later and which is disposed and provided integrally with the side plates 12A and 12B and the connecting member 12C is roughly configured.

  A reinforcing member 12D for increasing the strength while allowing the cooling air F to flow is attached to the upper surface side of the support frame 12 so as to straddle the side plates 12A and 12B. Further, a mounting plate 12E (see FIG. 2) for supporting a capacitor 14C 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 a bracket for attaching a heat exchanger 14 to be described later to the revolving frame 5 and the support frame 12. The bracket 13 is formed as a substantially rectangular frame, and the upper frame 13 </ b> A is a connecting member for the support frame 12. The lower frame 13 </ b> B is attached to the mounting bracket 5 </ b> H of the swivel frame 5 with screws. A radiator 14A and an oil cooler 14B constituting the heat exchanger 14 are attached to the bracket 13 in parallel in the front and rear directions.

  Reference numeral 14 denotes a heat exchanger disposed inside the support frame 12, and the heat exchanger 14 cools a heated liquid such as engine coolant or hydraulic oil. Here, the heat exchanger 14 includes a radiator 14A and an oil cooler 14B attached to the support frame 12 via a bracket 13, a condenser 14C attached to the support frame 12 via a mounting plate 12E, and the like. ing.

  The radiator 14 </ b> A cools the heated engine coolant by dissipating the heat of the engine coolant circulating between the radiator 14 </ b> A and the water jacket of the engine 8 into the cooling air F. The oil cooler 14B is heated by dissipating the heat of the working oil (return oil) circulating from the various hydraulic actuators mounted on the excavator 1 to the working oil tank (not shown) into the cooling air F. The hydraulic oil is cooled. The condenser 14C cools the heated refrigerant by dissipating the heat of the refrigerant (compressed refrigerant) used in the air conditioner provided in the cab 6 into the cooling air F.

  A reservoir tank 15 is attached to the side plate 12A of the support frame 12. The reservoir tank 15 stores engine coolant to be replenished to the radiator 14A.

  Reference numeral 16 denotes a suction-type cooling fan disposed so as to face the heat exchanger 14, and the cooling fan 16 is attached to a driven pulley 8 </ b> E of the engine 8. The cooling fan 16 is driven to rotate by using the engine 8 as a power source, thereby sucking outside air into the building cover 10 through the inflow port 10E, and using this outside air as cooling air F, the radiator 14A of the heat exchanger 14, the oil cooler 14B, capacitor 14C, etc.

  Next, the shroud 17 for adjusting the flow of the cooling air F introduced into the building cover 10 by the cooling fan 16 will be described.

  A shroud 17 is provided between the cooling fan 16 and the heat exchanger 14, and the shroud 17 forms a cooling air passage 18 between the cooling fan 16 and the heat exchanger 14. Here, the shroud 17 is roughly constituted by a heat exchanger side shroud 19, a fan ring 20, and an intermediate shroud 22 described later.

  19 is a heat exchanger side shroud provided on the heat exchanger 14 side, and the heat exchanger side shroud 19 is a heat exchanger in the flow direction of the cooling air F in the support frame 12 of the heat exchanger unit 11. It is comprised by the site | part which becomes downstream rather than 14. Here, the heat exchanger side shroud 19 has a box shape protruding from the radiator 14A and the oil cooler 14B to the cooling fan 16 side, and an opening 19A is formed on the surface facing the cooling fan 16 (FIG. 4). reference).

  Around the opening 19A, a cylindrical fixed cylinder portion 19B protruding toward the cooling fan 16 is provided, and an intermediate shroud 22 to be described later is attached to the fixed cylinder portion 19B.

  Reference numeral 20 denotes a fan ring provided on the cooling fan 16 side, and the fan ring 20 is formed as an annular cylindrical body surrounding the cooling fan 16 from the outer peripheral side. Here, the fan ring 20 has a substantially U-shaped cross-sectional shape in which the diameter gradually decreases from both axial end portions toward the central portion, and the outer peripheral surface 20A increases in diameter toward both axial end sides. It is a concave curved curved surface. The fan ring 20 is provided with a plurality of mounting pieces 20B projecting radially outward from the outer peripheral surface 20A. By attaching each of the mounting pieces 20B to a bracket 8F provided on the engine 8 using bolts 20C, The base end side of the fan ring 20 is configured to be fixed to the engine 8. Further, the front end side of the fan ring 20 is a free end and extends so as to overlap an intermediate shroud 22 described later.

  Reference numeral 21 denotes a groove member extending along the circumferential direction of the outer peripheral surface 20A of the fan ring 20, and the groove member 21 is formed of an arc-shaped long plate having a V-shaped cross section. Here, as shown in FIG. 5, an outer peripheral surface 20A of the fan ring 20 is provided with an attachment piece 20B for attachment to a bracket 8F provided on the engine 8, and the fan ring is arranged so as to avoid the attachment piece 20B. A plurality of (three in this embodiment) are provided at intervals in the circumferential direction of 20 outer peripheral surfaces 20A. This is because, for example, when the groove member 21 is formed in an annular shape, the groove member 21 interferes with the attachment piece 20 </ b> B and cannot be properly attached to the fan ring 20.

  Each groove member 21 is fixed to the outer peripheral surface 20A of the fan ring 20 by welding or the like, and is attached to an attachment portion 21A extending in an arc shape along the edge 20D of the fan ring 20, and bent in a V shape from the attachment portion 21A. And it is comprised by the receiving surface part 21B which receives the seal | sticker part 27 of the intermediate | middle shroud 22 mentioned later. The receiving surface portion 21 </ b> B is formed as a flat surface from the groove bottom portion of the groove member 21 toward the open end portion (the radially outer side of the fan ring 20). Each groove member 21 is fixed by welding or the like in the outer circumferential surface 20A of the fan ring 20 that is recessed in a concave curve, and the seal portion 27 of the intermediate shroud 22 described later is fitted, whereby the movement of the seal portion 27 is performed. It is intended to prevent the removal.

  Reference numeral 22 denotes an intermediate shroud provided between the heat exchanger side shroud 19 and the fan ring 20, and the intermediate shroud 22 is formed as a cylindrical body having flexibility. As shown in FIG. 6 and the like, the intermediate shroud 22 is roughly constituted by a fixing portion 23, an intermediate cylinder portion 25, an inward flange portion 26, and a seal portion 27 which will be described later.

  Reference numeral 23 denotes a fixed portion disposed on one end side (the heat exchanger 14 side) of the intermediate shroud 22 in the axial direction. The fixed portion 23 is fixed to the fixed cylinder portion 19B of the heat exchanger side shroud 19. is there. Here, the fixing portion 23 is formed as an annular band in which a groove 23A having a U-shaped cross section is formed over the entire circumference. And the fixing | fixed part 23 is fitted on the outer peripheral surface of the fixed cylinder part 19B provided in the heat exchanger side shroud 19, and the fixing | fixed part 23 of the intermediate | middle shroud 22 is heat-exchanged by the binding band 24 arrange | positioned in the concave groove 23A. It is fixed to the container side shroud 19.

  Reference numeral 25 denotes an intermediate tube portion extending from the edge of the fixed portion 23 toward the fan ring 20, and the intermediate tube portion 25 connects the fixed portion 23 and an inward flange portion 26 described later as shown in FIG. 6. It is formed as a substantially cylindrical cylinder. Moreover, the intermediate part of the axial direction of the intermediate | middle cylinder part 25 is the bending part 25A which has moderate bending in radial direction.

  Reference numeral 26 denotes an inward flange portion extending radially inward from the end edge of the intermediate cylindrical portion 25, and the inward flange portion 26 has an annular shape extending from the end edge of the intermediate cylindrical portion 25 toward the outer peripheral surface 20 </ b> A of the fan ring 20. There is no. The inner side surface 26 </ b> A of the inward flange portion 26 faces the heat exchanger 14, and the outer side surface 26 </ b> B of the inward flange portion 26 faces the engine 8.

  Reference numeral 27 denotes a seal portion disposed on the other axial end side (fan ring 20 side) of the intermediate shroud 22, and the seal portion 27 contacts the fan ring 20. Here, the seal portion 27 is provided on the inner peripheral side of the inward flange portion 26 over the entire circumference, and with respect to the fixed portion 23 (fixed end) fixed to the fixed cylindrical portion 19B of the heat exchanger side shroud 19, It is a free end. And the seal | sticker part 27 contacts the outer peripheral surface 20A of the fan ring 20 elastically over the perimeter in the state fitted by each groove member 21 provided in the fan ring 20. FIG.

  Here, the seal portion 27 is tightly fitted to the outer peripheral surface 20 </ b> A of the fan ring 20 with a predetermined tightening allowance, thereby ensuring adhesion (sealability) between the seal portion 27 and the fan ring 20. Accordingly, even when the fan ring 20 is tilted with respect to the heat exchanger side shroud 19 due to vibration or swing of the engine 8, the cooling air F is prevented from leaking from the seal portion 27. The seal portion 27 is provided with an inner projection portion 28 and a contact surface portion 29 which will be described later.

  Reference numeral 28 denotes an inner protrusion portion formed so as to protrude over the entire circumference of the intermediate shroud 22 in the seal portion 27. When the fan ring 20 is tilted with respect to the heat exchanger side shroud 19 due to vibration or swing of the engine 8 during operation of the hydraulic excavator 1, the inner protrusion portion 28 has an outer peripheral surface 20 </ b> A of the fan ring 20. And the abutting portion 21 </ b> A of the groove member 21 prevent the axial end edge portion 20 </ b> D of the fan ring 20 from contacting the intermediate shroud 22.

  Next, the contact surface portion 29 as a contact surface pressure reducing portion that reduces the contact surface pressure of the seal portion 27 of the intermediate shroud 22 will be described.

  Reference numeral 29 denotes a contact surface portion provided on the seal portion 27 of the intermediate shroud 22, and the contact surface portion 29 is in surface contact with the receiving surface portion 21 </ b> B of the groove member 21. Here, the contact surface portion 29 is formed of a flat surface formed in an annular shape over the entire circumference on the side surface of the seal portion 27 opposite to the inner projection portion 28, and as shown in FIGS. It is in surface contact with the receiving surface portion 21 </ b> B of the member 21. That is, the receiving surface portion 21 </ b> B of the groove member 21 is formed as a flat surface from the groove bottom portion of the groove member 21 toward the open end portion (the radially outer side of the fan ring 20). Accordingly, the contact surface portion 29 of the seal member 27 is also formed as a flat surface along the receiving surface portion 21B.

  Here, as described above, the seal portion 27 of the intermediate shroud 22 is tightly fitted to the fan ring 20 to ensure hermeticity, and the seal portion 27 of the intermediate shroud 22 is provided on the outer peripheral surface 20 </ b> A of the fan ring 20. A predetermined pressing force is applied to each groove member 21 inward in the radial direction. On the other hand, the contact surface portion 29 provided on the seal portion 27 is in surface contact with the receiving surface portion 21B of the groove member 21 over a wide range, so that the contact surface of the seal portion 27 with respect to the receiving surface portion 21B of each groove member 21 is obtained. The pressure can be reduced. In particular, the contact surface portion 29 of the seal portion 27 is in line contact with both end edges 21B1 of the receiving surface portion 21B, which is a sharp edge, thereby reducing the contact surface pressure of the seal portion 27 with respect to both end edges 21B1 of the receiving surface portion 21B. It has a configuration that can.

The hydraulic excavator 1 according to the reference example of the present invention has the above-described configuration. Next, the operation thereof will be described.

  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, the cooling fan 16 driven by the engine 8 allows outside air to flow in from the inlet 10E of the building cover 10, and this outside air is used as cooling air F to the heat exchanger 14 (radiator 14A, oil cooler). 14B, condenser 14C, etc.), the liquid to be cooled can be cooled. The cooling air F that has passed through the heat exchanger 14 passes through the cooling air passage 18 formed by the heat exchanger side shroud 19, the intermediate shroud 22, and the fan ring 20, and is guided to the engine 8 side. 8. It flows out through the periphery of the hydraulic pump 9 and the like through the outlet 10F.

  Here, since the seal portion 27 of the intermediate shroud 22 is tightly fitted to the fan ring 20 with an appropriate tightening allowance, the seal portion is provided in each groove member 21 provided separately on the outer peripheral surface 20A of the fan ring 20. When 27 is fitted, there is a possibility that the seal portion 27 may bite into the longitudinal edge 21B1 of the receiving surface portion 21B of each groove member 21. As described above, when the intermediate shroud 22 is displaced (rotated) in the circumferential direction with respect to the fan ring 20 due to vibration, swinging, or the like of the engine 8 with the seal portion 27 biting into the edge 21 </ b> B <b> 1 of the groove member 21. Since the seal portion 27 of the intermediate shroud 22 and each groove member 21 rub against each other, the seal portion 27 of the intermediate shroud 22 is scraped and worn and damaged by the edge 21B1 of each groove member 21. There arises a problem that the cooling air F leaks and the cooling efficiency is lowered.

On the other hand, in the reference example of the present invention, since the contact surface portion 29 made of an annular flat surface is provided on the seal portion 27 of the intermediate shroud 22, the contact surface portion 29 is formed on the groove member 21 provided on the fan ring 20. It is possible to make surface contact with the receiving surface portion 21B in a wide range.

  Thereby, since the contact surface pressure of the seal part 27 with respect to the receiving surface part 21B of the groove member 21 can be reduced, the stress which acts on the edge 21B1 of the receiving surface part 21B of the groove member 21 becomes small, and the said edge It can reduce that the seal part 27 bites into 21B1. Therefore, it is possible to prevent the seal portion 27 of the intermediate shroud 22 from being worn and damaged by rubbing against the edge 21B1 of the receiving surface portion 21B of the groove member 21, and to reliably prevent the cooling air F from leaking from the seal portion 27. Can do. As a result, the cooling efficiency of the heat exchanger 14 can be appropriately maintained over a long period of time, and the reliability of the hydraulic excavator 1 can be improved.

Next, FIG. 10 to FIG. 12 show a first embodiment of the present invention. The feature of this embodiment is that the contact surface pressure reducing portion is configured by arc portions provided at both ends of the receiving surface portion of the groove member. In the present embodiment, the same components as those in the reference example described above are denoted by the same reference numerals, and the description thereof is omitted.

Reference numeral 31 denotes an intermediate shroud provided between the heat exchanger side shroud 19 and the fan ring 20, and the intermediate shroud 31 is used in the present embodiment in place of the intermediate shroud 22 according to the reference example. . The intermediate shroud 31 is roughly constituted by a fixing portion 23, an intermediate cylinder portion 25, an inward flange portion 26, and a seal portion 32 described later.

  Reference numeral 32 denotes a seal portion disposed on the other axial end side (the fan ring 20 side) of the intermediate shroud 31, and the seal portion 32 contacts the fan ring 20. Here, the seal portion 32 is provided on the inner peripheral side of the inward flange portion 26 over the entire periphery, and is a free end with respect to the fixed portion 23 fixed to the fixed cylinder portion 19B of the heat exchanger side shroud 19. ing. And the seal | sticker part 32 contacts the outer peripheral surface 20A of the fan ring 20 elastically over the perimeter in the state fitted by each groove member 35 mentioned later.

  Here, the seal part 32 secures adhesion (sealability) between the seal part 32 and the fan ring 20 by being tightly fitted to the outer peripheral surface 20A of the fan ring 20 with a predetermined fastening allowance. The seal portion 32 is formed with an inner protrusion 33 and an outer protrusion 34 which will be described later.

  Reference numeral 33 denotes an inner protrusion formed so as to protrude over the entire circumference of the intermediate shroud 31 in the seal portion 32. When the fan ring 20 is inclined with respect to the heat exchanger side shroud 19 due to the vibration or swing of the engine 8, the inner protrusion 33 comes into contact with the outer peripheral surface 20A of the fan ring 20 or The end edge portion 20D of the fan ring 20 is prevented from coming into contact with the intermediate shroud 31 by coming into contact with a mounting portion 35A of the groove member 35 described later.

  Reference numeral 34 denotes an outer protrusion formed on the side surface of the seal portion 32 opposite to the inner protrusion 33 so as to protrude over the entire circumference. When the fan ring 20 is inclined with respect to the heat exchanger side shroud 19 due to the vibration or swing of the engine 8, the outer protrusion 34 comes into contact with a receiving surface portion 35B of a groove member 35 described later. The end edge of the groove member 35 on the engine 8 side is prevented from coming into contact with the intermediate shroud 31.

Reference numeral 35 denotes a groove member used in the first embodiment in place of the groove member 21 according to the reference example . The groove member 35 has a V-shaped cross section, and the circumferential direction of the outer peripheral surface 20A of the fan ring 20 Is formed by a thin plate-like long plate extending in an arc shape along the line. Here, the groove member 35 includes an attachment portion 35A attached to the outer peripheral surface 20A of the fan ring 20, and a receiving surface portion 35B that bends in a V shape from the attachment portion 35A and receives the seal portion 32 of the intermediate shroud 31. It is comprised by. Further, like the groove member 21 according to the reference example , a plurality of groove members 35 are provided apart from each other in the circumferential direction of the outer peripheral surface 20A of the fan ring 20. The groove member 35 is fixed by welding or the like in the outer peripheral surface 20A of the fan ring 20 that is recessed in a concave curve, and the seal portion 32 of the intermediate shroud 31 is fitted, thereby restricting the movement of the seal portion 32. To prevent removal.

Here, the contact surface pressure reducing portion in the first embodiment is configured by arc portions 35C provided at both ends in the longitudinal direction of the receiving surface portion 35B of the groove member 35. Hereinafter, the arc portion 35C will be described. explain.

  That is, 35C shows an arc portion as a contact surface pressure reducing portion provided on the receiving surface portion 35B of the groove member 35. Here, the arc portion 35C is formed by bending both ends in the longitudinal direction of the receiving surface portion 35B constituting the groove member 35 approximately 180 degrees until they face each of the receiving surface portions 35B. It is formed as an arcuate arc surface. Thus, the seal portions 32 are provided at both end portions of the receiving surface portion 35 </ b> B of each groove member 35 in a state where the seal portions 32 of the intermediate shroud 31 are fitted into the groove members 35 provided in the fan ring 20. It comes in contact with the circular arc portion 35C, and the contact surface pressure of the seal portion 32 with respect to both end portions of the receiving surface portion 35B can be reduced.

  Therefore, even when the seal portion 32 of the intermediate shroud 31 is tightly fitted to the outer peripheral surface 20A of the fan ring 20 with an appropriate fastening allowance, the seal portions 32 are arcs provided at both ends of the receiving surface portion 35B of the groove member 35. It is possible to suppress biting into the part 35C. As a result, the intermediate shroud 31 is displaced (rotated) in the circumferential direction with respect to the fan ring 20 due to vibration, swinging, and the like of the engine 8, and both end portions of the seal portion 32 of the intermediate shroud 31 and the receiving surface portion 35 </ b> B of the groove member 35. Even if the arc portion 35 </ b> C provided on the inner surface of the groove member 35 rubs against the arc portion 35 </ b> C, the seal portion 32 of the intermediate shroud 31 can be protected by the arc portion 35 </ b> C of the groove member 35.

  Thereby, abrasion and damage of the seal portion 32 of the intermediate shroud 31 can be prevented, and reliability can be improved by securing the cooling efficiency of the heat exchanger 14 over a long period of time.

Next, FIG. 13 and FIG. 14 show a second embodiment of the present invention. In the present embodiment, the reference example of the present invention and the first embodiment are combined. That is, the feature of the present embodiment is that a contact surface portion as a contact surface pressure reducing portion is provided in the seal portion of the intermediate shroud, and an arc as a contact surface pressure reducing portion is provided at both longitudinal ends of the receiving surface portion of the groove member. It is in the structure which provides a part. In the present embodiment, the same components as those in the reference example described above are denoted by the same reference numerals, and the description thereof is omitted.

Reference numeral 41 denotes a groove member used in the second embodiment instead of the groove member 21 according to the reference example, which is the same as the groove member 35 according to the first embodiment. That is, the groove member 41 has a V-shaped cross section and is formed of a thin plate-like long plate extending in an arc shape along the circumferential direction of the outer peripheral surface 20A of the fan ring 20. Here, the groove member 41 includes an attachment portion 41A attached to the outer peripheral surface 20A of the fan ring 20, and a receiving surface portion 41B that bends in a V shape from the attachment portion 41A and receives the seal portion 27 of the intermediate shroud 22. It is comprised by. Further, like the groove member 21 according to the reference example , a plurality of groove members 41 are provided apart from each other in the circumferential direction of the outer peripheral surface 20A of the fan ring 20. The groove member 41 is fixed by welding or the like in the outer peripheral surface 20A of the fan ring 20 that is recessed in a concave curve, and the seal portion 27 of the intermediate shroud 22 is fitted to restrict the movement of the seal portion 27. To prevent removal.

Here, similarly to the first embodiment, arc portions 41C as contact surface pressure reducing portions are provided at both longitudinal ends of the receiving surface portion 41B of the groove member 41. That is, the arc portion 41C is a smooth semicircle having no sharp edges by bending both ends in the longitudinal direction of the receiving surface portion 41B constituting the groove member 41 approximately 180 degrees until they face the receiving surface portion 41B. It is formed as an arcuate arc surface.

  Thereby, the contact surface portion 29 of the seal portion 27 comes into surface contact with the receiving surface portion 41B of the groove member 41, and the arc portions 41C provided at both ends of the receiving surface portion 41B come into surface contact with the seal portion 27. As a result, the contact surface pressure between the seal portion 27 and the receiving surface portion 41B can be further reduced, and the cooling efficiency can be appropriately improved over a long period of time by reliably preventing wear and damage of the seal portion 27. Can be maintained, and the reliability of the construction machine can be further improved.

In the first embodiment, both ends of the receiving surface portion 35B of the groove member 35 are bent to form the arc portion 35C. However, the present invention is not limited to this, for example, the longitudinal direction of the receiving surface portion 35B. Both end portions in the direction may be formed in an arc shape, or a circular arc portion may be formed by sticking a seal member or the like to both end portions in the longitudinal direction of the receiving surface portion 35B. The same applies to the second embodiment.

  In the above-described embodiment, the case where the engine 8 is provided as the prime mover and the cooling fan 16 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. For example, 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 can 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 11 Heat exchanger unit 14 Heat exchanger 14A Radiator 14B Oil cooler 14C Condenser 16 Cooling fan 17 Shroud 18 Cooling air passage 19 Heat exchanger side shroud 20 Fan ring 21, 35, 41 Groove member 21A, 35A, 41A Mounting part 21B, 35B, 41B Receiving surface portion 35C, 41C Arc portion (contact surface pressure reducing portion)
22, 31 Intermediate shroud 27, 32 Seal part 29 Contact surface part (contact surface pressure reducing part)

Claims (2)

A self-propelled vehicle body, a heat exchanger provided on the vehicle body for cooling the heated liquid, a cooling fan disposed facing the heat exchanger and supplying cooling air to the heat exchanger, and the cooling A shroud that forms a cooling air passage between the fan and the heat exchanger;
The shroud includes a heat exchanger side shroud provided on the heat exchanger side, a fan ring provided on the cooling fan side surrounding the cooling fan from an outer peripheral side, and one end side having flexibility. In a construction machine comprising a cylindrical intermediate shroud that is a fixed part that is fixed to the exchanger-side shroud and that is a seal part that elastically contacts the fan ring with the other end being a free end,
A plurality of groove members that extend along the circumferential direction of the fan ring and restrict the movement of the seal portion of the intermediate shroud are spaced apart in the circumferential direction on the outer peripheral surface of the fan ring,
Each of the groove members includes an attachment portion attached to the outer peripheral surface of the fan ring, and a receiving surface portion that is bent in a V shape from the attachment portion and receives the seal portion of the intermediate shroud,
The receiving surface portion of each groove member is formed as a flat surface extending obliquely from the groove bottom portion of the groove member toward the radially outer side of the fan ring,
The nest surface portion of the front Kimizo member, the formed longitudinal end portions of the nest area extending in the circumferential direction of the fan ring bent in an arc shape, the contact of the seal portion against the nest surface A construction machine characterized in that a contact surface pressure reducing portion for reducing the surface pressure is provided. The sealing portion of the front Symbol intermediate shroud, the other contact surface pressure reducing unit to reduce the contact surface pressure of the seal portion against the nest surface is formed as a flat surface that comes in surface contact with a nest surface consisting of the flat surface construction machine according to claim 1 formed by providing.

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