JP2019137369A - Construction machine - Google Patents

Abstract

To inhibit powder dust from flowing to the heat exchanger side through a gap between a filter member and a filter holding frame.SOLUTION: A dustproof device 21 includes: a frame member 22 having an outer frame 23 provided with an opening 23A through which cooling air passes and a filter holding frame 24 extending from the opening 23A to the heat exchanger 18 side; a filter member 26 which is held by the filter holding frame 24 of the frame member 22 while covering the opening 23A of the frame member 22; and a seal device 31 provided between the filter holding frame 24 of the frame member 22 and the filter member 26. The seal device 31 comprises: a first elastic body 32 which closes a gap between the filter holding frame 24 and the filter member 26 and inhibits vibration of the filter member 26 applied to the filter holding frame 24; and a second elastic body 33 which has a material harder than the first elastic body 32 and inhibits the filter member 26 from contacting with the filter holding frame 24.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a construction machine such as a hydraulic excavator provided with a dustproof device that captures dust contained in cooling air, for example.

  Generally, a hydraulic excavator as a representative example of a construction machine includes a self-propelled vehicle body composed of a lower traveling body and an upper revolving body, and a working device provided on the front side of the upper revolving body constituting the vehicle body so as to be able to be lifted and lowered. It is comprised by.

  The upper revolving unit is mounted on the revolving frame that forms the support structure, the counterweight provided on the rear side of the revolving frame to balance the weight of the work equipment, and the front side of the counterweight. Provided on the revolving frame facing the cooling fan, a building cover provided on the revolving frame that covers the mounted equipment including the engine, a cooling fan that supplies cooling air into the building cover, And a heat exchange device that cools the fluid with cooling air.

  The heat exchanger includes a radiator that cools the engine coolant, an oil cooler that cools the return oil from the hydraulic actuator, an intercooler that cools the intake air supplied to the engine by the turbocharger, a condenser that cools the refrigerant of the air conditioner, etc. It is configured to include. The heat generated from the heat exchange device is radiated into the outside air supplied into the building cover by the cooling fan, so that heat exchange is performed.

  By the way, a hydraulic excavator often performs, for example, work in an environment with a lot of dust, such as a work for collecting wood chips, coal, etc. in a hold of a transport ship, or a metal scrap dismantling and disposal work. If a large amount of dust is mixed in the cooling air (outside air) supplied to the building cover by the cooling fan, the heat exchange device is likely to become clogged with dust, resulting in a decrease in cooling performance due to the heat exchange device. In addition, there is a problem that the heat exchange device is broken.

  For this reason, the filter which capture | acquires the dust mixed in cooling air is provided in the upstream of the heat exchange apparatus in the flow direction of cooling air so that attachment or detachment is possible. In this case, the filter needs to be periodically cleaned in order to remove adhering dust, and it is desirable that the filter can be easily attached to and detached from the upper swing body.

  On the other hand, a filter mounting structure has been proposed in which an elastic body is provided on a filter that is attached to and detached from the filter mounting portion of the upper swing body, and the elastic body is deformed when the filter is mounted on the filter mounting portion. In this conventional filter mounting structure, a pressing force that presses the filter against the filter abutment surface of the filter mounting portion by a component of the elastic force of the deformed elastic body and a fixing that positions and fixes the filter with respect to the filter mounting portion You can get power and power. Thereby, workability | operativity when attaching / detaching a filter is improved (refer patent document 1).

JP 2008-208551 A

  However, in the filter mounting structure according to Patent Document 1, when a filter is inserted into the filter mounting portion, it is necessary to elastically deform an elastic body provided in the filter by the force of an operator. For this reason, there is a limit to the elastic force of the elastic body provided in the filter, and the pressing force on the filter due to the component force of the elastic force and the positioning fixing force on the filter cannot be set sufficiently large.

  For this reason, when the excavator is traveling or excavating, a large vibration occurs. When this vibration acts on the filter mounting portion or the filter, the elastic body cannot relieve the vibration, and the filter, the filter mounting member, May collide and break. As a result, the dust contained in the cooling air cannot be reliably captured by the filter, and there is a problem in that the cooling performance of the heat exchange device is reduced.

  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 prevent dust from passing through the gap between the filter member and the filter holding frame without impairing workability when the filter member is attached or detached. An object of the present invention is to provide a construction machine capable of suppressing the flow to the heat exchanging device side and protecting the filter member from a large vibration during traveling and working.

  The present invention comprises a self-propelled vehicle body and a work device provided on the vehicle body, the vehicle body comprising a vehicle body frame forming a support structure, and a work device provided on the rear side of the vehicle body frame. A counterweight for balancing the weight; a prime mover mounted on the vehicle body frame in a horizontally placed state extending in the left and right directions on the front side of the counterweight; and located on one side in the left and right directions of the prime mover A heat exchanging device mounted on the vehicle body frame for cooling the fluid by cooling air, a cooling fan provided facing the heat exchanging device and supplying cooling air to the heat exchanging device, and a flow direction of the cooling air In contrast, the present invention is applied to a construction machine provided with a dustproof device provided on the upstream side of the heat exchange device and capturing dust mixed in the cooling air.

  A feature of the present invention is that the dustproof device includes a frame member having an outer frame provided with an opening through which the cooling air passes, a filter holding frame projecting from the opening to the heat exchange device, and the frame member Between the filter holding frame and the filter member of the frame member, the filter member that is held by the filter holding frame of the frame member in a state of covering the opening of the frame member, and captures dust in the cooling air A first elastic body that closes a gap between the filter holding frame and the filter member and suppresses vibration of the filter member with respect to the filter holding frame; and The second elastic body is made of a second elastic body that has a material harder than the first elastic body and suppresses the filter member from coming into contact with the filter holding frame.

  According to the present invention, the first elastic body can suppress the dust mixed in the cooling air from flowing to the heat exchange device side through the gap between the filter holding frame of the frame member and the filter member. Further, the first elastic body suppresses the vibration of the filter member with respect to the filter holding frame, and the second elastic body suppresses the filter member from coming into contact with the filter holding frame. The filter member can be protected from vibration.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. It is sectional drawing which looked at the machine room of the upper revolving body from the arrow II-II direction in FIG. It is the perspective view which looked at the dustproof device by a 1st embodiment from the left rear. It is a disassembled perspective view which shows the frame member, filter member, filter fixed cover, seal device, etc. of a dustproof device. It is sectional drawing which looked at the frame member, the filter member, the filter fixing cover, the sealing device, etc. from the arrow VV direction in FIG. It is an expanded sectional view which expands and shows the filter member, filter holding frame, and sealing device in FIG. It is an expanded sectional view showing a seal device in the state where a filter member was removed from a filter holding frame. It is a disassembled perspective view which shows the frame member, filter member, and sealing device by 2nd Embodiment. It is an expanded sectional view similar to FIG. 6 which shows the sealing apparatus by 2nd Embodiment in the state which attached the filter member to the filter holding frame of a frame member. It is an expanded sectional view showing the seal device by a 2nd embodiment in the state where the filter member was removed from the filter holding frame. It is a disassembled perspective view which shows the frame member, filter member, and sealing device by 3rd Embodiment. It is the perspective view which looked at the filter member and seal device by a 3rd embodiment from the back side of the filter member. It is an expanded sectional view similar to FIG. 6 which shows the sealing apparatus by 4th Embodiment in the state which attached the filter member to the filter holding frame of a frame member. It is an expanded sectional view showing the seal device by a 4th embodiment in the state where the filter member was removed from the filter holding frame.

  Hereinafter, a hydraulic excavator will be exemplified as a representative example of the construction machine according to the present invention and will be described in detail with reference to FIGS.

  First, FIG. 1 to FIG. 7 show a first embodiment of the present invention. In the figure, the vehicle body of the hydraulic excavator 1 is composed of a self-propelled crawler-type lower traveling body 2 and an upper revolving body 3 that is mounted on the lower traveling body 2 so as to be able to swivel. On the front side of the upper swing body 3, a working device (front device) 4 for performing excavation work of earth and sand is provided.

  The working device 4 includes a boom 4A attached to the front side of a turning frame 5 described later so as to be rotatable upward and downward, and an arm 4B attached to the tip of the boom 4A so as to be rotatable upward and downward. A bucket 4C attached to the tip of the arm 4B so as to be rotatable upward and downward, a boom cylinder 4D that drives the boom 4A, an arm cylinder 4E that drives the arm 4B, and a bucket cylinder 4F that drives the bucket 4C It consists of

  A turning frame 5 as a body frame forms a support structure for the upper turning body 3. 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 forward and rear with a predetermined interval in the left and right directions. The left vertical plate 5B and the right vertical plate 5C extend to the front side of the left and right vertical plates 5B, 5C, and the foot part of the boom 4A constituting the work device 4 is rotatably attached. Yes. Further, the revolving frame 5 is disposed at intervals on the left and right outer sides of the vertical plates 5B and 5C, and extends in the front and rear directions. The left side frame 5D, the right side frame 5E, the bottom plate 5A, and the vertical plates A plurality of extended beams 5F (only two are shown in FIG. 2) extending left and right from 5B and 5C and supporting the left and right side frames 5D and 5E at the front ends thereof, and the vertical plates 5B, 5C, and a plurality of undercovers 5G forming a bottom surface between the side frames 5D, 5E.

  The counterweight 6 is provided at the rear part of the left and right vertical plates 5B and 5C constituting the revolving frame 5. The counterweight 6 is formed as a heavy object that balances the weight of the work device 4.

  The cab 7 is provided on the left front side of the revolving frame 5. The cab 7 defines a driver's cab in which an operator is boarded. Inside the cab 7, for example, a driver's seat on which the operator is seated, an operation lever for traveling, and an operation lever for work (all not shown). ) Is arranged.

  The machine room 8 is disposed on the front side of the counterweight 6. The machine room 8 is formed as a rectangular parallelepiped space extending between the counterweight 6 and the cab 7 in the left and right directions, and is covered with a building cover 13 and a dustproof device 21 which will be described later. In the machine room 8, an engine 9, a hydraulic pump 10, a heat exchange device 18 and the like, which will be described later, are accommodated.

  The engine 9 as a prime mover is provided on the rear side of the turning frame 5 and is located on the front side of the counterweight 6. The engine 9 is mounted on the rear side of the left and right vertical plates 5B and 5C constituting the revolving frame 5 in a horizontal state in which a crankshaft (not shown) extends in the left and right directions. A cooling fan 17 to be described later is provided on the left side of the engine 9, and a hydraulic pump 10 is provided on the right side of the engine 9. The hydraulic pump 10 constitutes a mounted device mounted on the revolving frame 5 together with the engine 9. The hydraulic pump 10 is pressurized by the hydraulic oil by being driven by the engine 9, and the cylinders 4D, 4E, 4F of the work device 4 are driven. It discharges toward a hydraulic actuator such as a hydraulic motor or a swing hydraulic motor (both not shown).

  The muffler 11 processes exhaust gas discharged from the engine 9 and is provided at the upper right position of the engine 9. The muffler 11 is provided at a position above the hydraulic pump 10 so as to extend forward and backward. The muffler 11 includes a muffler case 11A formed as a cylindrical container extending in the front and rear directions, an inflow port 11B projecting radially outward from the front position of the muffler case 11A, and the muffler case 11A. And an exhaust port 11 </ b> C provided extending upward and downward at a rear position. The inflow port 11B is connected to the exhaust manifold of the engine 9. The exhaust port 11 </ b> C is covered with an exhaust pipe 12, and the upper side of the exhaust pipe 12 is covered with an exhaust pipe cover 12 </ b> A protruding on an engine cover 16 described later.

  The building cover 13 is provided on the turning frame 5 so as to cover mounted devices such as the engine 9, the hydraulic pump 10, and the heat exchange device 18. The building cover 13 rises upward from the left side frame 5D side of the revolving frame 5 and the right side frame of the revolving frame 5 so as to cover the support frame 14 that supports the heat exchange device 18 and the hydraulic pump 10 from the right side. An engine provided to extend left and right between the right side cover 15 rising from the 5E side and the upper part of the support frame 14 and the upper part of the right side cover 15 so as to cover the engine 9 and the like from above. A cover 16 is included. The building cover 13 covers the machine room 8 on the revolving frame 5 together with a dustproof device 21 described later.

  Here, the support frame 14 constituting the building cover 13 is attached to the left side frame 5D of the revolving frame 5 and the like, and a front rising plate 14A that rises upward while facing the rear surface of the cab 7, and a front rising plate 14A, a rear rising plate 14B that rises upward while facing the front and rear directions with an interval, and an upper connecting plate that connects the upper end of the front rising plate 14A and the upper end of the rear rising plate 14B and extends in the front and rear directions 14C. A heat exchange device 18 is attached inside the front rising plate 14A and the rear rising plate 14B.

  On the other hand, a front bracket 14D extending upward and downward is provided at the left end portion of the front rising plate 14A of the support frame body 14, and a plurality of (for example, three) front brackets 14D are spaced apart in the upward and downward directions. A female screw hole 14E is formed. A rear bracket 14F extending upward and downward is provided at the left end portion of the rear rising plate 14B of the support frame 14, and a screw seat 14G having a U-shaped bent shape is provided on the rear bracket 14F. A plurality (for example, three) are provided at intervals in the upper and lower directions. Furthermore, a plurality of female screw holes 14H are provided on the left end side of the upper connecting plate 14C of the support frame body 14 at intervals in the front and rear directions.

  The cooling fan 17 is located in the machine room 8 and provided on the left side of the engine 9. The cooling fan 17 is driven to rotate by using the engine 9 as a power source, thereby sucking outside air into the building cover 13 (machine room 8) through the dustproof device 21, as indicated by an arrow F in FIG. This outside air is supplied to the heat exchange device 18 as cooling air. The cooling fan is not limited to the one using the engine 9 as a drive source, and for example, an electric fan or the like may be used.

  The heat exchange device 18 is disposed on the rear side of the cab 7 and is provided on the revolving frame 5 via the support frame 14 in a state of facing the cooling fan 17 in the left and right directions. The heat exchange device 18 includes, for example, a radiator that cools engine cooling water, an oil cooler that cools hydraulic oil, an intercooler that cools intake air supplied to the engine 9 by a turbocharger, a condenser that cools the refrigerant of the air conditioner, and the like. It consists of The heat exchange device 18 is disposed upstream of the cooling fan 17 in the flow direction of the cooling air by the cooling fan 17 (the direction indicated by arrow F in FIG. 2), that is, between the dustproof device 21 and the cooling fan 17. . The heat exchange device 18 dissipates heat generated from a radiator, an oil cooler, an intercooler, a condenser of an air conditioner, etc. into cooling air supplied into the building cover 13, so that engine coolant, hydraulic oil, turbocharger It cools fluid such as intake air that has passed through the machine and air conditioner refrigerant.

  Next, the dustproof device 21 used in the first embodiment will be described. The dustproof device 21 is disposed on the rear side of the cab 7, and is provided on the upstream side of the heat exchanging device 18 with respect to the flow direction of the cooling air by the cooling fan 17 (the direction of arrow F in FIG. 2). The dustproof device 21 captures dust such as dust mixed in the cooling air. The dustproof device 21 includes a frame member 22, a filter member 26, a filter fixing cover 27, and a seal device 31 which will be described later.

  The frame member 22 is attached to the support frame body 14 constituting the building cover 13. The frame member 22 sandwiches and holds the filter member 26 with the filter fixing cover 27. The frame member 22 is formed in a square frame shape using a steel plate material or the like, and is attached to the outer frame 23 in which a square opening 23A through which cooling air passes is formed in the center, and the opening 23A of the outer frame 23 And the filter holding frame 24 formed.

  The outer frame 23 is positioned on the front side of the opening 23A and extends upward and downward, the rear plate 23C is positioned on the rear side of the opening 23A and extends upward and downward, and the opening 23A The upper plate 23D is located on the upper side and extends in the front and rear directions, and the lower plate 23E is located on the lower side of the opening 23A and extends in the front and rear directions. The front plate 23B of the outer frame 23 faces the front bracket 14D of the support frame 14, and three bolt insertion holes 23F are formed in the front plate 23B at positions corresponding to the female screw holes 14E of the front bracket 14D. . The rear plate 23C of the outer frame 23 faces the rear bracket 14F of the support frame 14, and three bolt insertion holes 23G are formed in the rear plate 23C at positions corresponding to the screw seats 14G of the rear bracket 14F. ing. The upper end of the upper plate 23D is a bent surface 23D1 that is bent to the right so as to face the upper connecting plate 14C of the support frame 14, and the bent surface 23D1 has a female screw hole 14H of the upper connecting plate 14C. Four bolt insertion grooves 23H are formed at positions corresponding to. The front plate 23B of the outer frame 23 is provided with two screw seats 23J having a U-shaped bent shape so as to be spaced apart upward and downward, and the rear plate 23C of the outer frame 23 has a U-shape. Two screw seats 23K having a bent shape are spaced apart in the upward and downward directions.

  The filter holding frame 24 extends from the opening 23A of the outer frame 23 to the heat exchange device 18 side, and holds the filter member 26. The filter holding frame 24 includes a peripheral wall portion 24A having a rectangular frame shape substantially equal to the opening portion 23A of the outer frame 23, an overhang edge portion 24B projecting inward from the back position of the peripheral wall portion 24A, and an overhang edge portion. It is formed in a shallow frame shape by a vent 24C surrounded by 24B and through which cooling air flows. The filter holding frame 24 is integrated with the outer frame 23 by joining its peripheral wall 24A to the peripheral edge of the opening 23A of the outer frame 23 by means of welding or the like (see FIG. 5).

  The bolts 25 are inserted into the bolt insertion holes 23F and 23G and the bolt insertion grooves 23H provided on the folding surface 23D1 of the front plate 23B, the rear plate 23C, and the upper plate 23D of the outer frame 23 constituting the frame member 22. It is inserted. These bolts 25 are respectively screwed into the female screw holes 14E of the front bracket 14D of the support frame 14, the screw seats 14G of the rear bracket 14F, and the female screw holes 14H of the upper connecting plate 14C. Thereby, the frame member 22 is firmly fixed to the support frame body 14.

  The filter member 26 is held by the filter holding frame 24 in a state of covering the vent hole 24 </ b> C of the frame member 22. The filter member 26 captures dust in the cooling air passing through the vent hole 24C. Here, the filter member 26 includes an outer frame portion 26A having a rectangular frame shape, and a filter body 26B disposed on the inner peripheral side of the outer frame portion 26A. The outer frame portion 26A has a slightly smaller similar shape to the peripheral wall portion 24A of the filter holding frame 24 constituting the frame member 22, and is configured to be fitted inside the peripheral wall portion 24A via a seal device 31 described later. It has become. In addition, the outer frame portion 26A is provided with a handle 26C that is gripped by an operator when the frame member 22 is attached to or removed from the filter holding frame 24.

  On the other hand, the filter main body 26B is fixed to the inner side surface of the outer frame portion 26A using means such as adhesion and welding. The filter body 26 </ b> B is formed in a plate shape having an enlarged surface area, that is, an area capable of capturing dust, by a large number of chevron-shaped folds being continuous. The outer frame portion 26A of the filter member 26 is inserted inside the peripheral wall portion 24A of the filter holding frame 24 constituting the frame member 22, and is positioned with respect to the filter holding frame 24 in a state of being in contact with the overhanging edge portion 24B. Is done. In this state, the filter member 26 is self-supporting in the filter holding frame 24 and covers the vent hole 24C of the frame member 22 (filter holding frame 24).

  The filter fixing cover 27 is attached to the outer surface of the frame member 22 that is opposite to the machine room 8. The filter fixing cover 27 sandwiches and holds the filter member 26 with the filter holding frame 24 of the frame member 22. The filter fixing cover 27 is formed in a rectangular frame shape using a steel plate material or the like, and a rectangular ventilation opening 27A through which cooling air passes is formed in the center. The filter fixing cover 27 is located on the front side of the ventilation opening 27A and extends upward and downward, the rear plate 27C is located on the rear side of the ventilation opening 27A and extends upward and downward, and the ventilation opening 27A. Is formed in a rectangular frame shape surrounded by an upper plate 27D extending in the front and rear directions and a lower plate 27E extending under the ventilation opening 27A and extending in the front and rear directions.

  The ventilation opening 27 </ b> A of the filter fixing cover 27 has a size substantially equal to the opening 23 </ b> A provided in the outer frame 23 of the frame member 22. The front plate 27B of the filter fixing cover 27 faces the front plate 23B of the outer frame 23 of the frame member 22. The front plate 27B has two bolt insertion holes 27F at positions corresponding to the screw seats 23J of the outer frame 23. Is formed. The rear plate 27C of the filter fixing cover 27 faces the rear plate 23C of the outer frame 23 of the frame member 22. The rear plate 27C has two bolt insertion holes 27G at positions corresponding to the screw seats 23K of the outer frame 23. Is formed.

  A plurality of (for example, four) filter retainers 28 are provided on the inner surface of the filter fixing cover 27 facing the frame member 22. The filter retainer 28 is provided at a portion corresponding to each corner (four corners) of the filter member 26 on the inner side surface of the filter fixing cover 27, and when the filter fixing cover 27 is attached to the frame member 22, the filter holding frame 27. The filter member 26 held by 24 is pressed against and fixed to the overhanging edge 24B of the filter holding frame 24. As shown in FIG. 5, the filter retainer 28 includes a screw seat 28A fixed to the inner surface of the filter fixing cover 27 by welding or the like, and a bolt 28B screwed into the screw seat 28A. The head portion 28C is covered with a covering material (not shown) such as rubber.

  The heads 28C of the bolts 28B constituting the filter retainer 28 come into contact with the four corners of the outer frame portion 26A of the filter member 26 held by the filter holding frame 24 when the filter fixing cover 27 is attached to the frame member 22. The outer frame portion 26A is pressed against the protruding edge portion 24B of the filter holding frame 24. In this case, by adjusting the screwing amount of the bolt 28B with respect to the screw seat 28A, the pressing force by the head portion 28C of the bolt 28B with respect to the filter member 26 can be appropriately adjusted. As a result, the filter member 26 can be brought into close contact with the filter holding frame 24 via the sealing device 31 with an appropriate force, and the gap between the filter holding frame 24 and the filter member 26 can be suppressed. ing.

  Then, the frame fixing member 27 is attached to the support frame 14 constituting the building cover 13 using bolts 25 and the filter holding frame 24 of the frame member 22 holds the filter member 26 in a self-supporting state. Bolts 29 are inserted into the bolt insertion holes 27F and 27G provided in the front plate 27B and the rear plate 27C. Each of these bolts 29 is screwed to screw seats 23J and 23K provided on the outer frame 23 of the frame member 22, respectively. As a result, the filter fixing cover 27 is fixed to the frame member 22, and the filter member 26 is sandwiched between the filter fixing cover 27 and the filter holding frame 24 of the frame member 22. At this time, each filter presser 28 provided on the filter fixing cover 27 presses the four corners of the outer frame portion 26A of the filter member 26 against the overhanging edge portion 24B of the filter holding frame 24, whereby the filter member 26 is sealed. The filter 31 can be brought into close contact with the filter holding frame 24 with an appropriate force via the device 31.

  Next, the sealing device 31 used in the first embodiment will be described. The sealing device 31 is provided between the filter holding frame 24 and the filter member 26 of the frame member 22, closes the gap between them, and protects the filter member 26 from vibration of the hydraulic excavator 1. Here, the sealing device 31 includes a first elastic body 32 and a second elastic body 33 having a hardness higher (harder) than the first elastic body 32.

  The 1st elastic body 32 is provided over the perimeter at the corner | angular part which cross | intersects the overhang | projection edge part 24B among the surrounding wall parts 24A of the filter holding frame 24. FIG. The first elastic body 32 is formed into an elongated hollow pipe shape using an elastic material such as foamed rubber, for example, and has a semicircular (arc-shaped) cross-sectional shape as shown in FIG. The first elastic body 32 has a flat mounting surface 32A and an abutting surface 32B raised in an arc from the mounting surface 32A. The mounting surface 32A uses an adhesive on the inner peripheral surface of the peripheral wall portion 24A. Are glued together.

  Thus, the 1st elastic body 32 is attached to the inner peripheral surface of 24 A of surrounding wall parts over the perimeter in the state which contacted the overhang | projection edge part 24B of the filter holding frame 24. FIG. In the state where the filter member 26 is inserted inside the filter holding frame 24 as shown in FIG. 6, the contact surface 32 </ b> B of the first elastic body 32 is pressed by the outer frame portion 26 </ b> A of the filter member 26. Accordingly, the filter member 26 is brought into contact (contact) with elastic deformation. Therefore, the filter member 26 is elastically supported inside the filter holding frame 24 via the first elastic body 32, and the first elastic body 32 is a gap between the filter holding frame 24 and the filter member 26. Block. Thus, dust such as dust mixed in the cooling air is prevented from flowing into the heat exchange device 18 (machine room 8) through the gap between the filter holding frame 24 and the filter member 26, and the filter holding frame. The vibration of the filter member 26 with respect to 24 is suppressed.

  The second elastic body 33 is provided over the entire circumference on the inner peripheral surface of the outer frame 23 on the opening 23 </ b> A side of the peripheral wall portion 24 </ b> A of the filter holding frame 24. The second elastic body 33 is formed in an elongated strip shape having a rectangular cross-section using an elastic material such as a rubber plate having a hardness (hard) higher than that of the first elastic body 32. The second elastic body 33 has a flat mounting surface 33A and a filter receiving surface 33B, and the mounting surface 33A is bonded to the inner peripheral surface of the peripheral wall portion 24A using an adhesive. As a result, the second elastic body 33 is attached to the inner peripheral surface of the peripheral wall portion 24A over the entire circumference in a state where a constant distance (distance) S1 is maintained between the second elastic body 33 and the first elastic body 32. Yes.

  Here, as shown in FIG. 7, in a state where a load is not applied to the contact surface 32 </ b> B of the first elastic body 32 (natural state), the first elastic body 32 can be moved from the inner peripheral surface of the peripheral wall portion 24 </ b> A. The height up to the top of the arcuate contact surface 32B is the height dimension A of the first elastic body 32, and the height from the inner peripheral surface of the peripheral wall portion 24A to the filter receiving surface 33B of the second elastic body 33. Is the height dimension B of the second elastic body 33, the height dimension A of the first elastic body 32 is set larger than the height dimension B of the second elastic body 33 (A> B). ).

  Then, as shown in FIG. 6, the vibration generated when the hydraulic excavator 1 travels or works in a state where the filter member 26 is inserted inside the filter holding frame 24 and elastically supported by the first elastic body 32. Is relatively small, a gap C is set between the outer frame portion 26A of the filter member 26 and the filter receiving surface 33B of the second elastic body 33. Therefore, even if a relatively small vibration acts on the filter member 26, the first elastic body 32 is elastically deformed, so that the vibration of the filter member 26 can be suppressed from being transmitted to the frame member 22. Yes.

  On the other hand, when the hydraulic excavator 1 travels or works, a large vibration is generated. When this vibration acts on the filter member 26, the first elastic body 32 is greatly elastically deformed, so that the outer frame portion of the filter member 26 is 26A abuts against the filter receiving surface 33B of the second elastic body 33. Accordingly, the second elastic body 33 suppresses the filter member 26 from abutting against the filter holding frame 24 and suppresses vibration of the filter member 26 by elastic deformation. Thus, since the second elastic body 33 has a higher hardness than the first elastic body 32, when the first elastic body 32 is greatly elastically deformed, the outer frame portion 26A of the filter member 26 is 2 abuts against the elastic body 33. Accordingly, the filter member 26 can be prevented from colliding with the filter holding frame 24 and being damaged, and the filter member 26 can be protected. Further, the first elastic body 32 can be prevented from elastically deforming beyond the limit, and the first elastic body 32 can be protected.

  Further, the second elastic body 33 plays a role of guiding the outer frame portion 26 </ b> A of the filter member 26 toward the filter holding frame 24 when the filter member 26 is inserted into the filter holding frame 24. That is, if the filter member 26 is inserted into the filter holding frame 24 along the peripheral wall portion 24A of the filter holding frame 24, the outer frame portion 26A of the filter member 26 abuts against the first elastic body 32. Therefore, there is a possibility that a shearing force acts on the bonding surface of the first elastic body 32 and peels from the filter holding frame 24. Therefore, by guiding the outer frame portion 26 </ b> A of the filter member 26 by the second elastic body 33, the filter member 26 can be inserted into the filter holding frame 24 without the first elastic body 32 being peeled off. It has a configuration.

  In this case, the first elastic body 32 has a hollow pipe shape, and the contact surface 32B protrudes from the mounting surface 32A in an arc shape. Therefore, by inserting the filter member 26 into the filter holding frame 24 while being guided by the second elastic body 33, when the corner portion of the outer frame portion 26A comes into contact with the contact surface 32B, The elastic body 32 of 1 is elastically deformed so that the hollow portion is recessed. For this reason, it can suppress that a shearing force acts on the adhesion surface of 32 A of attachment surfaces of the 1st elastic body 32, and the surrounding wall part 24A of the filter holding frame 24, and the 1st elastic body 32 is from the surrounding wall part 24A. It has a configuration that can prevent peeling.

  On the other hand, the gap S1 formed between the first elastic body 32 and the second elastic body 33 is caused by the deformation of the first elastic body 32 when the filter member 26 is taken out of the filter holding frame 24. It plays the role which suppresses that the filter member 26 becomes difficult to take out. That is, when the filter member 26 is taken out of the filter holding frame 24, the second elastic body 33 is caused by friction between the contact surface 32B of the first elastic body 32 and the outer frame portion 26A of the filter member 26. May deform to the side. However, since the interval S1 is secured between the first elastic body 32 and the second elastic body 33, the filter receiving surface 33B of the second elastic body 33 and the outer frame portion 26A of the filter member 26 are separated. In the meantime, the deformation of the deformed first elastic body 32 can be suppressed. As a result, the filter member 26 can be smoothly removed from the filter holding frame 24.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration, and the operation of the hydraulic excavator 1 will be described below.

  First, the operator gets on the cab 7 and operates the engine 9. By operating the operating lever in this state, the lower traveling body 2 can be driven to move the hydraulic excavator 1 to the work site. Further, the operator can perform the excavation work of earth and sand, etc. by operating the operation lever for work to move the working device 4 up and down while turning the upper turning body 3.

  During the operation of the engine 9, the cooling fan 17 rotates, and the pressure between the heat exchange device 18 and the cooling fan 17 tends to be negative in the building cover 13. As a result, outside air is introduced into the building cover 13 through the dustproof device 21, and this outside air is supplied as cooling air to the heat exchange device 18 as indicated by arrow F in FIG. The heat exchange device 18 can cool fluid such as engine coolant and hydraulic oil by exchanging heat with the supplied cooling air.

  Here, the excavator 1 has an environment with a lot of fine wood dust and dust such as work for collecting wood chips and coal in the hold of a transport ship, as well as dismantling and disposal of metal scrap, in addition to excavation work for earth and sand. I often do the work below.

  On the other hand, when the cooling air containing dust passes through the filter member 26 of the dustproof device 21, the dust can be captured by the filter member 26. Thereby, dust can be separated from the cooling air supplied to the heat exchange device 18, and the cooling air consisting only of the cleaned outside air can be supplied to the heat exchange device 18. As a result, it is possible to prevent dust from adhering to the heat exchange device 18 and clogging, and the cooling performance of the heat exchange device 18 can be maintained well over a long period of time.

  At this time, the first elastic body 32 provided between the filter holding frame 24 and the filter member 26 of the frame member 22 is elastically deformed by being pressed by the outer frame portion 26 </ b> A of the filter member 26. 26. As a result, the first elastic body 32 closes the gap between the filter holding frame 24 and the filter member 26, and dust or the like mixed in the cooling air is heated through the gap between the filter holding frame 24 and the filter member 26. It can suppress flowing into the exchange device 18 (machine room 8). Further, the first elastic body 32 elastically supports the filter member 26 with respect to the filter holding frame 24. Thereby, even when the hydraulic excavator 1 travels or works, vibrations are generated by the first elastic body 32 even if the vibrations act on the filter member 26.

  On the other hand, when the hydraulic excavator 1 travels or works, a large vibration is generated. When this vibration acts on the filter member 26, the first elastic body 32 is greatly elastically deformed, so that the outer frame portion of the filter member 26 is 26A abuts against the filter receiving surface 33B of the second elastic body 33. In this case, since the second elastic body 33 is made of a material harder than the first elastic body 32, the filter member 26 can be prevented from colliding with the filter holding frame 24 and being damaged. Moreover, the second elastic body 33 can protect the first elastic body 32 by suppressing the first elastic body 32 from elastically deforming beyond the limit.

  Next, in order to remove a large amount of dust captured by the filter member 26, the filter member 26 needs to be periodically subjected to maintenance work such as cleaning, and the maintenance work for the filter member 26 will be described below.

  In order to remove the filter member 26 during maintenance work, first, the bolt 29 that fixes the filter fixing cover 27 to the frame member 22 is removed from the screw seats 23J and 23K of the frame member 22 (outer frame 23). In this state, the filter fixing cover 27 is removed from the frame member 22. Thereby, the filter member 26 held by the filter holding frame 24 of the frame member 22 can be exposed to the outside.

  In this case, the filter member 26 is sandwiched and fixed between the filter holding frame 24 of the frame member 22 and the filter fixing cover 27. Therefore, the fixed state of the filter member 26 can be released simply by removing the filter fixing cover 27 from the frame member 22. Moreover, since the filter member 26 is held in a self-supporting state by the filter holding frame 24, it is not necessary to support the filter member 26 when removing the filter fixing cover 27.

  After removing the filter fixing cover 27, the filter member 26 can be easily removed from the filter holding frame 24 by gripping a handle 26C provided on the outer frame portion 26A of the filter member 26. And the filter member 26 can be cleaned by spraying compressed air, washing water, etc. on the filter main body 26B of the filter member 26, and removing the dust adhering to the filter main body 26B.

  Here, when the filter member 26 is removed from the filter holding frame 24, the contact surface 32B of the first elastic body 32 is caused by the frictional force between the outer frame portion 26A of the filter member 26 and the first elastic body 32. The second elastic body 33 may be deformed. However, since the interval S1 is secured between the first elastic body 32 and the second elastic body 33, the filter receiving surface 33B of the second elastic body 33 and the outer frame portion 26A of the filter member 26 are separated. In the meantime, the deformation of the deformed first elastic body 32 can be suppressed. Thereby, the filter member 26 can be smoothly removed from the filter holding frame 24.

  Next, when the cleaned filter member 26 is attached, the second elastic body 33 fixed to the inner peripheral surface of the peripheral wall portion 24A of the filter holding frame 24 is held in a state where the handle 26C of the filter member 26 is held. The filter member 26 is inserted into the filter holding frame 24. In this case, the outer frame portion 26 </ b> A of the filter member 26 is guided by the second elastic body 33, so that the height dimension B of the second elastic body 33 is between the peripheral wall portion 24 </ b> A of the filter holding frame 24. The filter is inserted into the filter holding frame 24 while maintaining a corresponding gap. Therefore, the outer frame portion 26A of the filter member 26 is prevented from colliding with the lower end side of the first elastic body 32 (near the adhesion surface with the peripheral wall portion 24A), and the first elastic body 32 is removed from the filter holding frame 24. It can suppress peeling. Further, since the filter member 26 is inserted into the filter holding frame 24 by elastically deforming only the soft first elastic body 32, the operator can easily put the filter member 26 into the filter holding frame 24 with a small force. Can be inserted into.

  Then, the filter member 26 is self-supported in the filter holding frame 24 in a state where the first elastic body 32 is elastically deformed by the outer frame portion 26A of the filter member 26 (see FIG. 6). In this state, the filter fixing cover 27 faces the outer frame 23 of the frame member 22, bolts 29 are inserted into the bolt insertion holes 27 </ b> F and 27 </ b> G provided in the filter fixing cover 27, and the bolts 29 are connected to the frame member. The screw seats 23J and 23K provided on the outer frame 23 of the 22 are respectively screwed.

  Thereby, the filter fixing cover 27 is fixed to the frame member 22, and the filter member 26 is sandwiched between the filter fixing cover 27 and the filter holding frame 24 of the frame member 22, thereby firmly fixing the filter member 26. be able to. Therefore, even if vibration occurs during traveling of the hydraulic excavator 1 or during excavation work, the vibration causes the filter member 26 to fall off the frame member 22 or to be displaced relative to the filter holding frame 24 of the frame member 22. Can be suppressed. As a result, the dust contained in the cooling air can be reliably captured by the filter member 26, and the cooling performance by the heat exchange device 18 can be favorably maintained over a long period of time.

  Thus, the dust-proof device 21 according to the first embodiment has a frame member having an outer frame 23 provided with an opening 23A through which cooling air passes and a filter holding frame 24 projecting from the opening 23A to the heat exchange device 18 side. 22, a filter member 26 held by the filter holding frame 24 of the frame member 22 in a state of covering the opening 23 </ b> A of the frame member 22, and the filter holding frame 24 of the frame member 22 and the filter member 26. The sealing device 31 is provided. The sealing device 31 closes the gap between the filter holding frame 24 and the filter member 26 and also suppresses vibration of the filter member 26 with respect to the filter holding frame 24 and the first elastic body 32. The second elastic body 33 is made of a harder material and prevents the filter member 26 from coming into contact with the filter holding frame 24.

  The first elastic body 32 fixed to the peripheral wall portion 24 </ b> A of the filter holding frame 24 is in close contact with the outer frame portion 26 </ b> A of the filter member 26 by being elastically deformed between the filter holding frame 24 and the filter member 26. As a result, the gap between the filter holding frame 24 and the filter member 26 can be closed by the first elastic body 32. As a result, the dust mixed in the cooling air can be prevented from flowing into the heat exchange device 18 through the gap between the filter holding frame 24 and the filter member 26. Further, since the filter member 26 is inserted into the filter holding frame 24 with a small force by elastically deforming only the soft first elastic body 32, the workability when the filter member 26 is attached can be improved. .

  Moreover, even if the vibration generated during traveling or work of the hydraulic excavator 1 is applied to the filter member 26, the vibration is alleviated by the elastic deformation of the first elastic body 32, so that the vibration of the filter member 26 is applied to the frame member 22. It is possible to suppress transmission. On the other hand, when a large vibration occurs during traveling or working of the hydraulic excavator 1, the first elastic body 32 is greatly elastically deformed, so that the outer frame portion 26 </ b> A of the filter member 26 becomes the second elastic body 33. It contacts with the filter receiving surface 33B. Thereby, the second elastic body 33 can suppress the filter member 26 from abutting against the filter holding frame 24 and can reduce vibration of the filter member 26 by elastic deformation. As a result, it is possible to suppress the filter member 26 from abutting against the filter holding frame 24 and to prevent the filter member 26 and the filter holding frame 24 from being damaged. Furthermore, the first elastic body 32 can be prevented from elastically deforming beyond the limit, and the first elastic body 32 can be protected.

  Further, the second elastic body 33 is configured so that the filter member 26 (outer frame portion 26A) comes into contact with the peripheral wall portion 24A of the filter holding frame 24 and the filter member when the filter member 26 is inserted into the filter holding frame 24. A gap corresponding to the height dimension B of the second elastic body 33 is maintained between the outer frame portion 26 </ b> A of 26. Accordingly, the outer frame portion 26A of the filter member 26 is prevented from colliding with the lower end side of the first elastic body 32 (near the adhesive surface with the peripheral wall portion 24A), and the first elastic body 32 is prevented from being filtered. Can be prevented from peeling off. As a result, the workability when inserting the filter member 26 into the filter holding frame 24 can be improved.

  Next, FIG. 8 to FIG. 10 show a second embodiment of the present invention, and the feature of the second embodiment is that the first elastic body constituting the seal device includes a filter holding frame, a filter member, And a rubber member that suppresses vibration of the filter member relative to the filter holding frame. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  Similar to the sealing device 31 according to the first embodiment, the sealing device 41 according to the second embodiment includes a first elastic body and a second elastic body 33. However, the first elastic body is different from the first elastic body 32 according to the first embodiment in that the first elastic body includes a seal member 42 and a rubber member 43 which will be described later.

  The first elastic body constitutes the sealing device 41 together with the second elastic body 33, and includes a seal member 42 that closes a gap between the filter holding frame 24 and the filter member 26, and a filter member for the filter holding frame 24. It is comprised with the rubber member 43 which suppresses 26 vibration. In this case, the seal member 42 and the rubber member 43 are formed using a material having a lower hardness (softer) than the second elastic body 33.

  The seal member 42 is provided on the overhang edge 24 </ b> B of the filter holding frame 24 over the entire circumference. The seal member 42 is formed in an elongated strip shape having a rectangular cross-sectional shape using an elastic material such as rubber, for example. The seal member 42 has a flat mounting surface 42A and a contact surface 42B, and the mounting surface 42A is bonded to the inner side surface of the overhang edge 24B using an adhesive. Therefore, by inserting the filter member 26 into the filter holding frame 24 and pressing the outer frame portion 26A of the filter member 26 against the contact surface 42B of the seal member 42, the seal member 42 is 24 is elastically deformed between the overhanging edge 24B and the filter member 26. Thereby, the contact surface 42B of the seal member 42 is in close contact with the outer frame portion 26A of the filter member 26, and the seal member 42 closes the gap between the protruding edge portion 24B of the filter holding frame 24 and the filter member 26. It has become.

  The rubber member 43 is located on the front plate 23B side of the outer frame 23 in the peripheral wall portion 24A of the filter holding frame 24, on the two positions spaced apart on the lower side, and on the rear plate 23C side of the outer frame 23, It is provided in a total of four places, including two places spaced downward (see FIG. 8). Each rubber member 43 is formed into an elongated hollow pipe shape using an elastic material such as foamed rubber, for example, and, like the first elastic body 32 used in the first embodiment, has a semicircular shape (arc shape). ) (See FIG. 10). That is, each rubber member 43 has a flat mounting surface 43A and an abutting surface 43B raised in an arc from the mounting surface 43A, and the mounting surface 43A uses an adhesive on the inner peripheral surface of the peripheral wall portion 24A. It is glued.

  Here, as shown in FIG. 10, the height dimension A from the inner peripheral surface of the peripheral wall portion 24A of the filter holding frame 24 to the apex of the contact surface 43B of the rubber member 43 is the first from the inner peripheral surface of the peripheral wall portion 24A. It is set larger than the height dimension B of the second elastic body 33 to the filter receiving surface 33B (A> B). As a result, when the filter member 26 is inserted inside the filter holding frame 24 as shown in FIG. 9, the contact surface 43 </ b> B of each rubber member 43 is pressed by the outer frame portion 26 </ b> A of the filter member 26. Elastically deforms. Therefore, the filter member 26 is elastically supported inside the filter holding frame 24 via each rubber member 43, and the vibration of the filter member 26 with respect to the filter holding frame 24 can be suppressed by each rubber member 43. It has become.

  Further, each rubber member 43 is attached to the second elastic body 33 at a position maintaining a certain distance (distance) S2. Thus, even when the contact surface 43B of the rubber member 43 is deformed by the frictional force with the outer frame portion 26A of the filter member 26 when the filter member 26 is removed from the filter holding frame 24, the second elastic body 33 The configuration is such that the deformed rubber member 43 can be prevented from being caught between the filter receiving surface 33B and the outer frame portion 26A of the filter member 26.

  The sealing device 41 according to the second embodiment has the above-described configuration, and the basic action is not different from that according to the first embodiment. That is, when the filter member 26 is inserted into the filter holding frame 24, the seal member 42 is elastically deformed between the protruding edge portion 24 </ b> B of the filter holding frame 24 and the filter member 26, so that the filter holding frame 24 ( The gap between the edge 24B) and the filter member 26 is closed. As a result, the dust mixed in the cooling air can be prevented from flowing into the heat exchange device 18 through the gap between the filter holding frame 24 and the filter member 26.

  Further, even if vibration generated during traveling or work of the hydraulic excavator 1 is applied to the filter member 26, each rubber member 43 fixed to the peripheral wall portion 24 </ b> A of the filter holding frame 24 is connected to the filter holding frame 24, the filter member 26, and the like. It is possible to mitigate the vibration of the filter member 26 being transmitted to the frame member 22. On the other hand, when a large vibration occurs during traveling or work of the hydraulic excavator 1, the second elastic body 33 prevents the filter member 26 from abutting against the filter holding frame 24, and the filter member by elastic deformation. 26 vibrations can be mitigated.

  In this case, each rubber member 43 is not provided on the entire circumference of the peripheral wall portion 24A of the filter holding frame 24, but is located on the front plate 23B side of the outer frame 23, and two locations spaced apart on the front and bottom sides, and the outer frame 23 is provided at two locations on the rear plate 23C side and spaced apart on the upper and lower sides. Thereby, when the filter member 26 is inserted into the filter holding frame 24, the frictional force generated between the outer frame portion 26A of the filter member 26 and each rubber member 43 can be reduced. Therefore, by adjusting the length of each rubber member 43, the resistance force when inserting the filter member 26 can be adjusted, and when inserting the filter member 26 without changing the material of each rubber member 43. Can be easily changed.

  Next, FIGS. 11 and 12 show a third embodiment of the present invention. The feature of the third embodiment is that the first elastic body constituting the seal device together with the second elastic body is a seal. The seal member, the rubber member, and the second elastic body are each provided in the filter member. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  Similar to the sealing device 31 according to the first embodiment, the sealing device 51 according to the third embodiment includes a first elastic body and a second elastic body 54 described later. However, the first elastic body is different from the first elastic body 32 according to the first embodiment in that the first elastic body is constituted by a seal member 52 and a rubber member 53 described later.

  The first elastic body constitutes the sealing device 51 together with the second elastic body 33, and includes a seal member 52 that closes a gap between the filter holding frame 24 and the filter member 26, and a filter member for the filter holding frame 24. It is comprised with the rubber member 53 which suppresses 26 vibration. In this case, the seal member 52 and the rubber member 53 are formed using a material having a lower hardness (softer) than the second elastic body 54.

  The seal member 52 is provided over the entire circumference of the outer frame portion 26 </ b> A of the filter member 26. The sealing member 52 is formed in an elongated strip shape having a rectangular cross section using an elastic material such as rubber, and is bonded to the outer peripheral surface of the outer frame portion 26A using an adhesive. Therefore, by inserting the filter member 26 into the filter holding frame 24, the seal member 52 is elastically deformed between the outer frame portion 26 </ b> A of the filter member 26 and the peripheral wall portion 24 </ b> A of the filter holding frame 24. As a result, the gap between the filter holding frame 24 and the filter member 26 can be closed by the seal member 52, and the dust mixed in the cooling air exchanges heat through the gap between the filter holding frame 24 and the filter member 26. The configuration is such that it can be prevented from flowing into the device 18.

  The rubber member 53 is located on the outer plate 23 </ b> A of the filter member 26 on the front plate 23 </ b> B side of the outer frame 23 and on the outer plate 23 </ b> C and on the rear plate 23 </ b> C side of the outer frame 23. In addition, the adhesive is used to bond a total of four locations with the two outer peripheral surfaces spaced downward. Each rubber member 53 is formed into an elongated hollow pipe shape using an elastic material such as foamed rubber, for example, and, like the first elastic body 32 used in the first embodiment, has a semicircular shape (arc shape). ). Thereby, in a state where the filter member 26 is inserted inside the filter holding frame 24, each rubber member 53 elastically supports the filter member 26 while being elastically deformed by being pressed by the filter member 26. Accordingly, the vibration of the filter member 26 with respect to the filter holding frame 24 can be suppressed by each rubber member 53.

  The second elastic body 54 is provided over the entire outer peripheral surface of the outer frame portion 26 </ b> A of the filter member 26. The second elastic body 54 is formed in an elongated band shape using an elastic material such as a rubber plate having a higher hardness (harder) than the seal member 52 and the rubber member 53 constituting the first elastic body, and the outer frame portion 26A. It is adhered to the outer peripheral surface of the substrate using an adhesive. The second elastic body 54 comes into contact with the peripheral wall portion 24 </ b> A of the filter holding frame 24 when a large vibration acts on the filter member 26 when the hydraulic excavator 1 is traveling or working. Accordingly, the filter member 26 can be prevented from directly abutting against the filter holding frame 24, and the vibration of the filter member 26 can be reduced by elastic deformation, thereby preventing the filter member 26 and the filter holding frame 24 from being damaged. It has a configuration that can.

  The sealing device 51 according to the third embodiment has the above-described configuration, and the basic operation is not different from that according to the first embodiment. However, according to the third embodiment, the seal member 52, the rubber member 53, and the second elastic body 54 constituting the first elastic body are respectively attached to the outer frame portion 26A of the filter member 26. Yes. Therefore, when replacing the filter member 26 that requires periodic replacement, the seal member 52, the rubber member 53, and the second elastic body 54 can be replaced together with the filter member 26, and maintenance can be performed. Can be improved.

  Next, FIGS. 13 and 14 show a fourth embodiment of the present invention. The feature of the fourth embodiment is that the first elastic body constituting the seal device together with the second elastic body is a seal. The rubber member and the second elastic body are provided by being laminated between the filter holding frame and the filter member. Note that in the fourth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The sealing device 61 according to the fourth embodiment is composed of a first elastic body and a second elastic body 33, similarly to the sealing device 31 according to the first embodiment. However, the first elastic body is different from the first elastic body 32 according to the first embodiment in that the first elastic body is constituted by a seal member 62 and a rubber member 63 described later.

  The first elastic body constitutes a sealing device 61 together with the second elastic body 33, a seal member 62 that closes a gap between the filter holding frame 24 and the filter member 26, and a filter member for the filter holding frame 24. 26, and a rubber member 63 that suppresses the vibrations 26. In this case, the seal member 62 and the rubber member 63 are formed using a material having a lower hardness (softer) than the second elastic body 33.

  The seal member 62 is provided on the overhang edge 24 </ b> B of the filter holding frame 24 over the entire circumference. The seal member 62 is formed in an elongated strip shape having a rectangular cross-sectional shape using an elastic material such as rubber. The seal member 62 has a flat mounting surface 62A and a contact surface 62B, and the mounting surface 62A is bonded to the inner side surface of the overhang edge 24B using an adhesive. Therefore, by inserting the filter member 26 into the filter holding frame 24, the seal member 62 is elastically deformed between the outer frame portion 26 </ b> A of the filter member 26 and the protruding edge portion 24 </ b> B of the filter holding frame 24. Thereby, the gap between the overhanging edge 24 </ b> B of the filter holding frame 24 and the filter member 26 can be closed by the seal member 62.

  The rubber member 63 is provided over the entire circumference between the peripheral wall portion 24 </ b> A of the filter holding frame 24 and the filter member 26 in a state of being laminated on the second elastic body 33. The rubber member 63 is formed into an elongated hollow pipe shape using an elastic material such as foam rubber, for example, and has a semicircular (arc-shaped) cross-sectional shape. The rubber member 63 has a flat mounting surface 63A and an abutting surface 63B protruding in an arc from the mounting surface 63A, and the mounting surface 63A uses an adhesive for the filter receiving surface 33B of the second elastic body 33. By being bonded together, it is integrated with the second elastic body 33. Thereby, the second elastic body 33 and the rubber member 63 having different hardness are laminated in the thickness direction of the peripheral wall portion 24A.

  In the state where the filter member 26 is inserted inside the filter holding frame 24 as shown in FIG. 13, the contact surface 63B of the rubber member 63 is elastically deformed by being pressed by the outer frame portion 26A of the filter member 26. However, it abuts against the filter member 26. Therefore, the filter member 26 is elastically supported inside the filter holding frame 24 via the second elastic body 33 and the rubber member 63. As a result, the rubber member 63 is configured to block a gap between the peripheral wall portion 24A of the filter holding frame 24 and the filter member 26 and to suppress vibration of the filter member 26 with respect to the filter holding frame 24.

  The sealing device 61 according to the fourth embodiment has the above-described configuration, and the basic operation is not different from that according to the first embodiment. However, according to the fourth embodiment, the gap between the overhanging edge 24B of the filter holding frame 24 and the filter member 26 can be closed by the seal member 62, and the peripheral wall 24A of the filter holding frame 24 can be closed. The rubber member 63 can close the gap between the filter member 26 and the filter member 26. Thus, the sealing member 62 and the rubber member 63 can reliably suppress the dust mixed in the cooling air from flowing into the heat exchanging device 18 through the gap between the filter holding frame 24 and the filter member 26. it can.

  In addition, the second elastic body 33 and the rubber member 63 having different hardnesses are laminated and integrated by bonding in advance. Therefore, the second elastic body 33 and the rubber member 63 are separately attached to the filter holding frame 24 by bonding the second elastic body 33 to which the rubber member 63 is bonded to the peripheral wall portion 24A of the filter holding frame 24. The operation | work which adhere | attaches on the surrounding wall part 24A can be made unnecessary. Thereby, workability | operativity when attaching the 2nd elastic body 33 and the rubber member 63 to the filter holding frame 24 can be improved. Further, for example, the width dimension of the peripheral wall portion 24A of the filter holding frame 24 (the dimension from the opening 23A to the overhanging edge portion 24B of the outer frame 23) is small, and the second elastic body 33 and the rubber member 63 are arranged in the width direction. Even when the second elastic body 33 and the rubber member 63 are laminated in the thickness direction of the peripheral wall portion 24A, the second elastic body 33 can be bonded to the peripheral wall portion 24A even when the second elastic body 33 and the rubber member 63 are stacked.

  In the first embodiment, the case where the first elastic body 32 is formed in a hollow pipe shape is illustrated. However, the present invention is not limited to this, and the first elastic body is formed into a polygonal or circular shape by using a soft material that can be elastically deformed by contacting the filter member 26 inserted into the filter holding frame 24. Alternatively, it may be formed as a solid body having a cross-sectional shape such as an ellipse. The same applies to the rubber members 43, 53, and 63 used in the second, third, and fourth embodiments.

  Furthermore, in the embodiment, the crawler type hydraulic excavator 1 is exemplified as the construction machine. However, the present invention is not limited to this, and may be applied to other construction machines such as a wheel type hydraulic excavator and a wheel loader. it can.

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
4 Working device 5 Turning frame (body frame)
6 Counterweight 9 Engine (Motor)
DESCRIPTION OF SYMBOLS 17 Cooling fan 18 Heat exchange device 21 Dust-proof device 22 Frame member 23 Outer frame 23A Opening 24 Filter holding frame 26 Filter member 31, 41, 51, 61 Sealing device 32 1st elastic body 33, 54 2nd elastic body 42 , 52, 62 Seal member 43, 53, 63 Rubber member

Claims (5)

A self-propelled vehicle body and a working device provided on the vehicle body,
The vehicle body includes a vehicle body frame that forms a support structure, a counterweight that is provided on the rear side of the vehicle body frame and balances the weight of the working device, and is positioned on the front side of the counterweight and extends leftward and rightward. A prime mover mounted on the vehicle body frame in a horizontally placed state, a heat exchange device that is located on one side of the prime mover in the left and right directions and is mounted on the vehicle body frame to cool a fluid with cooling air, and the heat exchange device A cooling fan that faces the heat exchanger and supplies cooling air to the heat exchange device; and a dust-proof device that is provided upstream of the heat exchange device with respect to the flow direction of the cooling air and captures dust mixed in the cooling air A construction machine comprising a device,
The dustproof device includes a frame member having an outer frame provided with an opening through which the cooling air passes and a filter holding frame projecting from the opening to the heat exchange device side;
A filter member that is held by the filter holding frame of the frame member in a state of covering the opening of the frame member and captures dust in the cooling air;
A seal device provided between the filter holding frame of the frame member and the filter member;
The sealing device includes a first elastic body that blocks a gap between the filter holding frame and the filter member and suppresses vibration of the filter member with respect to the filter holding frame, and a material harder than the first elastic body And a second elastic body that prevents the filter member from coming into contact with the filter holding frame.   The construction machine according to claim 1, wherein the first elastic body is formed in a hollow pipe shape.   The first elastic body is provided between the filter holding frame and the filter member over the entire circumference, and seals between the filter holding frame and the filter member. The construction machine according to claim 1, wherein the construction machine includes a rubber member that suppresses vibration of the filter member with respect to the filter holding frame by being deformed.   The construction machine according to claim 3, wherein the rubber member is formed in a hollow pipe shape.   The construction machine according to claim 3, wherein the rubber member and the second elastic body are stacked between the filter holding frame and the filter member.

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