Working machinery

Abstract

We provide work machinery that reduces the burden of cleaning work inside buildings. [Solution] The work machine comprises a vehicle body supporting a building with an equipment storage chamber formed inside; a cooling fan positioned behind the equipment storage chamber and discharging air that flows into the equipment storage chamber through an opening formed in the outer wall of the building as cooling air to the rear of the vehicle body; a heat exchanger positioned between the equipment storage chamber and the cooling fan and exchanging heat between the fluid passing through it and the cooling air; and a bottom wall member that forms the bottom surface of the equipment storage chamber, with one end in the vehicle width direction supported by the vehicle body by a pivot shaft extending in the front-rear direction, and the other end in the vehicle width direction rotatable vertically around the pivot shaft. The bottom wall member is configured to be rotatable between a first position in which the other end is positioned below the heat exchange section of the heat exchanger through which the cooling air passes, and a second position in which the other end is positioned above the first position.

Description

Technical Field

[0001] The present invention relates to a work machine in which dust flows into an engine building.

Background Art

[0002] Conventionally, in a general work machine, a cooling fan that generates cooling air and a heat exchanger that exchanges heat between the cooling air generated by the cooling fan and a fluid (e.g., coolant, hydraulic oil, air) are arranged inside a building that houses a prime mover. In such a work machine, when the cooling fan rotates, outside air flows into the building through an opening provided in the outer wall of the building. Dust enters the building together with the outside air. The dust that enters the building causes, for example, clogging of the heat exchanger, so regular cleaning of the heat exchanger is required. Therefore, for example, as disclosed in Patent Document 1, a technique has been proposed to improve the efficiency of the cleaning operation of the heat exchanger by configuring the heat exchanger to be rotatable.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, some of the dust that enters the building corrodes inside the building (e.g., wood chips, livestock feed, etc.), so it is not preferable to leave the dust accumulated inside the building. In particular, dust tends to accumulate on the bottom surface that constitutes the building, and regular cleaning work is required. However, inside the building, components and pipes are complexly laid out, and there is a problem that the burden of cleaning work inside the building is large.

[0005] This invention has been made in view of the above circumstances, and its purpose is to provide a work machine that reduces the burden of cleaning work inside a building. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides a work machine comprising: a vehicle body supporting a building having an equipment storage chamber formed inside; a cooling fan positioned behind the equipment storage chamber and discharging air that flows into the equipment storage chamber through an opening formed in the outer wall of the building as cooling air to the rear of the vehicle body; and a heat exchanger positioned between the equipment storage chamber and the cooling fan and exchanging heat between a fluid passing through its interior and the cooling air, wherein the work machine comprises a bottom wall member that forms the bottom surface of the equipment storage chamber, with one end in the vehicle width direction supported by the vehicle body by a pivot shaft extending in the front-rear direction, and the other end in the vehicle width direction being rotatable vertically around the pivot shaft, wherein the bottom wall member is configured to be rotatable between a first position in which the other end is positioned below the heat exchange portion of the heat exchanger through which the cooling air passes, and a second position in which the other end is positioned above the first position. [Effects of the Invention]

[0007] According to the present invention, the burden of cleaning work inside a building can be reduced. Further issues, configurations, and effects not mentioned above will be clarified by the following description of the embodiments. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of a wheel loader according to this embodiment. [Figure 2] This is a perspective view of the engine building with the left and rear walls removed. [Figure 3] This is an exploded perspective view of the bottom wall member. [Figure 4] This is an assembly perspective view of the bottom wall component. [Figure 5] This is a perspective view of the bottom wall member with the plate-shaped member removed, as seen from the left side of the wheel loader. [Figure 6]This is a perspective view of the bottom wall member, with the plate-shaped member removed, as seen from the right side of the wheel loader. [Figure 7] This is a perspective view of the bottom wall member in the first position, as seen from the left side of the wheel loader. [Figure 8] This is a perspective view of the bottom wall member in the first position, seen from the right side of the wheel loader. [Figure 9] This is a perspective view of the bottom wall member in the second position, seen from the left side of the wheel loader. [Modes for carrying out the invention]

[0009] Hereinafter, with reference to the drawings, a wheel loader 10, an example of a work machine according to the present invention, will be described. In this specification, front, back, left, and right refer to the viewpoint of the operator riding and operating the wheel loader 10, unless otherwise specified. Furthermore, the specific work machine is not limited to the wheel loader 10, but may also be a dump truck, hydraulic excavator, crane, etc.

[0010] [Overall configuration of wheel loader 10] Figure 1 is a side view of the wheel loader 10 according to this embodiment. As shown in Figure 1, the wheel loader 10 has a body composed of a front frame 11 and a rear frame 12. The front frame 11 and the rear frame 12 are connected by a center pin 13 so as to be rotatable in the left-right direction (vehicle width direction). The front frame 11 and the rear frame 12 are also connected by a pair of left and right steering cylinders 14L and 14R. The pair of steering cylinders 14L and 14R extend and retract by receiving hydraulic fluid from a hydraulic pump (not shown).

[0011] By extending one of the pair of steering cylinders 14L and 14R and retracting the other, the front frame 11 bends laterally relative to the rear frame 12 around the center pin 13. This changes the relative mounting angle between the front frame 11 and the rear frame 12, causing the vehicle body to bend and turn. In other words, this wheel loader 10 is an articulated type in which the front frame 11 and the rear frame 12 bend around the center pin 13.

[0012] The front frame 11 supports a pair of left and right front tires 15L and 15R and a front working machine 16. The front working machine 16 has lift arms 17, a bucket 18, a pair of lift arm cylinders 19, a bucket cylinder 20, and a bell crank 21.

[0013] The lift arms 17 extend in the front-rear direction. More specifically, the front end of the lift arms 17 is rotatably connected to the bucket 18, and the rear end is rotatably connected to the front frame 11. Then, the lift arms 17 rotate (pitch) in the vertical direction by the extension and contraction of the pair of lift arm cylinders 19.

[0014] The bucket 18 has a concave-shaped space capable of accommodating luggage (such as earth and sand). Also, the bucket 18 is supported rotatably (tilt or dump) at the front end of the lift arms 17. More specifically, the bucket 18 rotates in the vertical direction as the bell crank 21 rotates with the extension and contraction of the bucket cylinder 20.

[0015] The rear frame 12 supports a pair of left and right rear tires 22L and 22R, a cab 23, an engine housing 24 (housing), and a counterweight 25.

[0016] An internal space for an operator to operate the wheel loader 10 is formed in the cab 23. Inside the cab 23, a seat (not shown) for the operator to sit on and an operating device (not shown) operated by the operator sitting on the seat are arranged. When the operator boarding the cab 23 operates the operating device, the wheel loader 10 travels and the front working machine 16 operates. The operating device includes, for example, a steering wheel, pedals, levers, switches, etc.

[0017] The engine house 24 is supported by the rear frame 12 behind the cab 23 and in front of the rearmost end of the counterweight 25. The engine house 24 has an internal space for accommodating components (such as the engine 26, the aftertreatment device 27, the cooling fan 28, and the heat exchanger 29) for driving the wheel loader 10.

[0018] The internal space of the engine house 24 is defined, for example, by an upper wall 30 on the upper surface, a left side wall 31 on the left surface, a right side wall (not shown) on the right surface, a rear wall 32 on the rear surface, a front wall 33 (see FIG. 2) on the front surface, and the rear frame 12 and a bottom wall member 40 described later on the bottom surface. The upper wall 30, the left side wall 31, the right side wall, and the rear wall 32 are examples of outer walls (outer covers) that are exposed outside the wheel loader 10. Also, since the right side wall is symmetrical to the left side wall 31, its illustration is omitted.

[0019] FIG. 2 is a perspective view of the engine house 24 with the left side wall 31 and the rear wall 32 removed. As shown in FIG. 2, the internal space of the engine house 24 is partitioned in the front-rear direction by a partition wall 34. The engine 26 and the aftertreatment device 27 are arranged in front of the partition wall 34 in the internal space of the engine house 24. Also, the cooling fan 28 and the heat exchanger 29 are arranged behind the partition wall 34 in the internal space of the engine house 24. Further, a equipment accommodation chamber 35 is formed between the partition wall 34 and the heat exchanger 29 in the internal space of the engine house 24. The equipment accommodation chamber 35 refers to the space defined by the upper wall 30, the left side wall 31, the right side wall, the partition wall 34, the heat exchanger 29, and the bottom wall member 40.

[0020] The left side wall 31 is configured to rotate around a pivot axis X1 extending in the front-rear direction, which is located at its upper part. That is, the lower end of the left side wall 31 rotates vertically around the pivot axis X1, allowing it to be opened and closed. When the left side wall 31 is closed, it defines the left side of the internal space (equipment housing room 35) of the engine building 24. On the other hand, when the left side wall 31 is opened, the internal space (equipment housing room 35) of the engine building 24 is exposed to the outside. Similarly, the left side wall also opens and closes the left side of the internal space (equipment housing room 35) of the engine building 24.

[0021] Furthermore, an opening 36 is formed in the left side wall 31. More specifically, the left side wall 31 has an opening 36 that penetrates the left side wall 31 in the thickness direction at a position facing the equipment housing chamber 35 in the left-right direction. The opening 36 in the left side wall 31 is formed, for example, by a plurality of small holes (punch holes) or a plurality of slits. An opening is similarly formed in the right side wall. In addition, the rear wall 32 has an opening 37 that penetrates the rear wall 32 in the thickness direction. The opening 37 in the rear wall 32 is formed, for example, by a mesh-like rear grille.

[0022] When the cooling fan 28 rotates, air (outside air) flows into the equipment housing chamber 35 from the openings 36 in the left wall 31 and the right wall, passes through the heat exchanger 29, and is discharged from the opening 37 in the rear wall 32. However, the air flowing into the equipment housing chamber 35 from the opening 36 contains dust (for example, wood chips, straw, sand, etc.). The dust that enters the equipment housing chamber 35 does not pass through the heat exchanger 29 but accumulates on the bottom surface of the equipment housing chamber 35 (i.e., the bottom wall member 40).

[0023] The engine 26 generates the driving force necessary to operate the wheel loader 10. The driving force from the engine 26 is transmitted, causing the front tires 15L, 15R and the rear tires 22L, 22R to rotate. This causes the wheel loader 10 to move. The aftertreatment device 27 purifies the exhaust gas discharged from the engine 26. The aftertreatment device 27 includes, for example, a NOx reduction catalyst that selectively reduces nitrogen oxides contained in the exhaust gas with ammonia produced from urea water, decomposing them into water and nitrogen. In addition, the aftertreatment device 27 may also include an EGR (Exhaust Gas Recirculation) device that recirculates a portion of the exhaust gas to the intake side, and a DPF (Diesel Particulate Filter) that collects particulate matter in the exhaust gas.

[0024] The cooling fan 28 is positioned within the internal space of the engine building 24, behind the equipment housing 35 and the heat exchanger 29, and in front of the rear wall 32. The cooling fan 28 rotates due to the driving force of a fan motor (not shown) and generates cooling air. More specifically, the cooling fan 28 discharges air that has flowed into the equipment housing 35 through openings 36 formed in the left wall 31 and the right wall as cooling air to the rear. That is, the cooling air is discharged from the equipment housing 35 through the heat exchanger 29 and the cooling fan 28, and out through the opening 37 in the rear wall 32.

[0025] The heat exchanger 29 is located behind the equipment housing chamber 35 and in front of the cooling fan 28 (i.e., between the equipment housing chamber 35 and the cooling fan 28). The heat exchanger 29 exchanges heat between the cooling air generated by the cooling fan 28 and a fluid (e.g., coolant, hydraulic oil, air). The region of the heat exchanger 29 through which the cooling air passes (in other words, the region where the fluid exchanges heat with the cooling air) is referred to as the "heat exchange section (radiator core) 29a". The heat exchange section 29a is, for example, the region inside the frame-shaped frame that defines the outer edge of the heat exchanger 29. The heat exchanger 29 includes, for example, a radiator that exchanges heat between the coolant that cools the engine 26 and the cooling air, an oil cooler that exchanges heat between the hydraulic oil that operates a hydraulic actuator and the cooling air, and part or all of an intercooler that cools the air compressed by a supercharger mounted on the engine 26.

[0026] Furthermore, the rear frame 12 supports the urea tank 38a. The urea tank 38a stores urea water to be supplied to the aftertreatment device 27. The urea water stored in the urea tank 38a is supplied to the aftertreatment device 27 through a pipeline 39. The pipeline 39 enters the equipment housing chamber 35, for example, through a through-hole 43c in the bottom wall member 40, and is connected to the aftertreatment device 27 through a through-hole (not shown) that penetrates the partition wall 34 in the thickness direction.

[0027] Furthermore, the rear frame 12 supports a fuel tank 38b that stores fuel (e.g., diesel fuel) supplied to the engine 26, located below the engine building 24 (more specifically, the equipment housing room 35). The components supported by the rear frame 12 are not limited to the urea tank 38a and the fuel tank 38b; they may also include a hydraulic oil tank that supplies hydraulic fluid to the hydraulic pump. The pipeline 39 is through which these liquids (urea solution, fuel, and hydraulic fluid) pass, and is an example of a linear member composed of, for example, metal piping, a flexible hose, or a combination thereof. The specific example of the linear member is not limited to the pipeline 39; it may also include a harness that transmits and receives control signals between the engine 26, the hydraulic pump, and a valve (not shown).

[0028] [Configuration of bottom wall member 40] Figure 3 is an exploded perspective view of the bottom wall member 40. Figure 4 is an assembled perspective view of the bottom wall member 40. Figure 5 is a perspective view of the bottom wall member 40 with the plate-shaped member 43 removed, as seen from the left side of the wheel loader 10. Figure 6 is a perspective view of the bottom wall member 40 with the plate-shaped member 43 removed, as seen from the right side of the wheel loader 10. Figure 7 is a perspective view of the bottom wall member 40 in the first position, as seen from the left side of the wheel loader 10. Figure 8 is a perspective view of the bottom wall member 40 in the first position, as seen from the right side of the wheel loader 10. Figure 9 is a perspective view of the bottom wall member 40 in the second position, as seen from the left side of the wheel loader 10.

[0029] The bottom wall member 40 is a member that forms (defines) the bottom surface of the equipment housing chamber 35. The bottom wall member 40 is also a member that is operated by an operator to discharge dust accumulated on the bottom surface of the equipment housing chamber 35 to the outside of the engine building 24. As shown in Figures 3 and 4, the bottom wall member 40 comprises a pair of support members 41 and 42, a plate-shaped member 43, a pair of hinges 44 and 45, and a gripping portion 46.

[0030] Support members 41 and 42 are rod-shaped members extending in the left-right direction. Support members 41 and 42 are, for example, so-called "L-shaped angles" with an L-shaped cross-section perpendicular to the direction of extension. Support members 41 and 42 are spaced apart in the front-rear direction. The distance between support members 41 and 42 corresponds to the length of the bottom wall member 40 (in other words, the bottom surface of the equipment housing room 35) in the front-rear direction. Support members 41 and 42 are also spaced apart in the up-down direction. More specifically, support member 41 is positioned above support member 42. Furthermore, support members 41 and 42 are made of metal (for example, steel plates) to serve as a frame that maintains the shape of the bottom wall member 40.

[0031] Support member 41 extends in the left-right direction from the front end of the bottom wall member 40. Support member 41 is composed of a support portion 41a and a partition portion 41b erected upward from the front end of the support portion 41a. Support member 42 extends in the left-right direction from the rear end of the bottom wall member 40. Support member 42 is composed of a support portion 42a and a partition portion 42b erected upward from the rear end of the support portion 42a.

[0032] The plate-shaped member 43 has a plate-like shape that defines the bottom surface of the equipment housing chamber 35. The plate-shaped member 43 is made of, for example, rubber. However, the material constituting the plate-shaped member 43 is not limited to rubber, and can be any material that is flexible and lightweight. The plate-shaped member 43 is supported by the support portions 41a and 42a of a pair of support members 41 and 42. Because support member 41 is positioned above support member 42, the plate-shaped member 43 is supported by the support portions 41a and 42a in a state of downward sloping toward the rear (downstream in the direction of cooling air flow within the equipment housing chamber 35).

[0033] The length of the plate-shaped member 43 in the front-rear direction corresponds to the distance between the pair of support members 41 and 42. The front end of the plate-shaped member 43 is placed on the support portion 41a of support member 41, and the rear end of the plate-shaped member 43 is placed on the support portion 42a of support member 42, and it is fixed to the support portions 41a and 42a by bolts 47 at multiple positions spaced apart in the left-right direction. Furthermore, the area of ​​the upper surface of the plate-shaped member 43 that is supported by the support portions 41a and 42a (the area between the tongue portions 43a and 43b, which will be described later) is a flat surface. In addition, the plate-shaped member 43 can be removed from the support portions 41a and 42a by removing the bolts 47. In other words, the plate-shaped member 43 is detachably supported by the pair of support members 41 and 42.

[0034] Furthermore, the vertical length (i.e., thickness) of the plate-shaped member 43 is shorter than the vertical length of the partition sections 41b and 42b. That is, when the plate-shaped member 43 is supported by the support sections 41a and 42a, the partition sections 41b and 42b are erected above the upper surface of the plate-shaped member 43. This prevents dust accumulated on the upper surface of the plate-shaped member 43 from leaking out to the front and rear of the bottom wall member 40.

[0035] Furthermore, the length of the plate-shaped member 43 in the left-right direction is longer than the length of the support members 41 and 42 in the left-right direction. Therefore, both ends of the plate-shaped member 43 in the left-right direction are bent along the left-right ends of the support members 41a and 42a to form downward-hanging tongue-shaped portions 43a and 43b. As shown in Figures 7 and 8, the tongue-shaped portions 43a and 43b hang downward along the outer surface (left and right sides) of the rear frame 12. This prevents dust accumulated on the plate-shaped member 43 from falling into the interior of the rear frame 12 and accumulating on the fuel tank 38b.

[0036] Furthermore, the plate-shaped member 43 has a through hole 43c and a slit 43d formed therein. The through hole 43c penetrates the plate-shaped member 43 in the thickness direction at the left end (other end) in the left-right direction. The position of the through hole 43c is closer to the left end than the center in the left-right direction of the plate-shaped member 43, and is on the opposite side from the mounting position of the hinges 44 and 45. The through hole 43c allows the conduit 39 to pass through. The slit 43d is a cut that penetrates the plate-shaped member 43 in the thickness direction and extends in the left-right direction.

[0037] Furthermore, one end of the slit 43d is connected to the through hole 43c, and the other end is open to the left end of the plate-shaped member 43 (the tip of the tongue portion 43a). In other words, the slit 43d extends from the through hole 43c to the end opposite to the mounting position of the hinges 44 and 45. The pipeline 39, which is pre-routed from the urea tank 38a through the equipment housing chamber 35 to the aftertreatment device 27, is inserted into the through hole 43c through the slit 43d.

[0038] A pair of hinges 44 and 45 are positioned between the right end of the engine building 24 and the right end (one end) of the bottom wall member 40. Furthermore, the pair of hinges 44 and 45 are spaced apart in the front-rear direction. Additionally, hinge 44 is positioned above hinge 45. More specifically, as shown in Figure 6, one end of the pair of hinges 44 and 45, flanking the pivot axes X2 and X3, is attached to the engine building 24, and the other end is attached to the lower surface of the support parts 41a and 42a. The pair of hinges 44 and 45 rotate the bottom wall member 40 around the pivot axes X2 and X3. The pivot axes X2 and X3 extend in the front-rear direction at the right end of the bottom wall member 40.

[0039] In other words, the bottom wall member 40 rotates around the pivot axes X2 and X3, with its right end as the pivot base and its left end as the pivot tip. To put it another way, the bottom wall member 40 rotates such that the position of its right end is fixed and its left end moves vertically. As a result, the bottom wall member 40 rotates between the first position shown in Figure 7 and the second position shown in Figure 9.

[0040] The first position is one in which the bottom wall member 40 is positioned below the heat exchange section 29a of the heat exchanger 29. That is, when the bottom wall member 40 is in the first position, the cooling air flowing into the equipment housing chamber 35 through the opening 36 can pass through the entire area of ​​the heat exchange section 29a. The first position is also one in which the bottom wall member 40 closes the lower surface of the equipment housing chamber 35. That is, when the bottom wall member 40 is in the first position, dust entering the equipment housing chamber 35 does not fall toward the rear frame 12. Also, when the bottom wall member 40 is in the first position, the hot air discharged through the opening 37 of the rear wall 32 is prevented from circling around the bottom of the frame 12 and flowing into the equipment housing chamber 35.

[0041] The second posture is one in which the other end of the bottom wall member 40 is positioned higher than in the first posture. On the other hand, one end of the bottom wall member 40 is in the same position in both the first and second postures. That is, the second posture is one in which the inclination angle from one end of the bottom wall member 40 to the other is greater than that of the first posture. The inclination angle is the angle that the plate-shaped member 43 makes with respect to the horizontal plane when the bottom wall member 40 is viewed from the front-rear direction. That is, the left end of the bottom wall member 40, which is the tip of rotation, is positioned higher when the bottom wall member 40 is in the second posture than when the bottom wall member 40 is in the first posture. In other words, the bottom wall member 40 in the second posture is inclined downwards toward the right (towards the hinges 44 and 45). On the other hand, the lateral inclination angle of the bottom wall member 40 in the first posture may be horizontal or slightly inclined, as long as it is smaller than that in the second posture.

[0042] The gripping portion 46 is the part that is gripped by the operator when the bottom wall member 40 is rotated. The gripping portion 46 is provided on the left end side of the bottom wall member 40. The gripping portion 46 also connects a pair of support members 41 and 42 (support portions 41a and 42a) to each other. The gripping portion 46 is, for example, brought into contact with the upper surface of the support portions 41a and 42a through a through hole provided in the plate-shaped member 43 and fastened to the support portions 41a and 42a by bolts (not shown) inserted from below the support portions 41a and 42a.

[0043] Furthermore, the wheel loader 10 is equipped with catches 48 and 49, as shown in Figure 5. The catches 48 and 49 are, for example, permanent magnets fixed to the engine building 24. The catches 48 and 49 are positioned so as to be able to contact the lower surfaces of the support parts 41a and 42a when the bottom wall member 40 is in the first position. The catches 48 and 49 are examples of resistance members that bias the bottom wall member 40 downward (to the first position).

[0044] More specifically, when the bottom wall member 40 is in the first position, the support members 41 and 42 are fixed to the catches 48 and 49 by magnetic force. The catches 48 and 49 then prevent the bottom wall member 40 from rotating if the external force attempting to rotate it from the first position to the second position is below a threshold. On the other hand, if the external force is above the threshold, the bottom wall member 40 rotates from the first position to the second position against the magnetic force of the catches 48 and 49.

[0045] External forces that attempt to rotate the bottom wall member 40 from the first position to the second position include, for example, the force exerted by the operator when gripping and lifting the gripping part 46, and vibrations generated by the wheel loader 10 traveling on uneven terrain. The threshold is appropriately set by the magnetic force of the catches 48 and 49. In other words, the catches 48 and 49 prevent the bottom wall member 40 from flapping due to vibrations of the wheel loader 10 when traveling on uneven terrain (small external force), and rotate the bottom wall member 40 when the operator lifts the gripping part 46 (large external force).

[0046] Furthermore, the wheel loader 10 is equipped with a holding member 50, as shown in Figures 5, 7, and 9. The holding member 50 is provided on the other end (rotating tip side) of the bottom wall member 40. The holding member 50 is configured to be switchable between a holding state in which the bottom wall member 40 is held in a second position and a permitting state in which the bottom wall member 40 is permitted to rotate from the second position to the first position. The holding member 50 is composed of, for example, a holding portion 51 and a held portion 52.

[0047] The upper end of the holding portion 51 is fixed to the partition wall 34, and the lower end is bent toward the partition wall 34. The lower end of the holding portion 51 is also movable toward a direction away from the partition wall 34. The held portion 52 is fixed to the back surface of the partition portion 41b of the support member 41. The held portion 52 has a recess into which the lower end of the holding portion 51 can enter. Furthermore, the lower end of the holding portion 51 is positioned so that it can be inserted into and removed from the recess of the held portion 52 when the bottom wall member 40 is in the second position.

[0048] When the lower end of the holding portion 51 is inserted into the recess of the held portion 52, the bottom wall member 40 is held in the second position. The state in which the lower end of the holding portion 51 is inserted into the recess of the held portion 52 is an example of a held state. On the other hand, when the lower end of the holding portion 51 is removed from the recess of the held portion 52, the bottom wall member 40 becomes rotatable from the second position to the first position. The state in which the lower end of the holding portion 51 is removed from the recess of the held portion 52 is an example of an allowable state.

[0049] In other words, when the operator lifts the gripping part 46 with the right side wall open, the bottom wall member 40 rotates from the first position to the second position against the magnetic force of the catches 48 and 49. As a result, dust accumulated on the bottom wall member 40 slides down to the right along the downward-sloping bottom wall member 40 and is discharged to the outside of the engine building 24 from the right side of the opened equipment housing chamber 35. Furthermore, when the bottom wall member 40 is in the second position, the operator can insert the lower end of the holding part 51 into the recess of the held part 52, release their hand from the bottom wall member 40 in the second position, and clean the inside of the equipment housing chamber 35 with both hands. Moreover, when the operator removes the lower end of the holding part 51 from the recess of the held part 52, the operator can rotate the bottom wall member 40 from the second position back to the first position by pushing down the gripping part 46 (or by gravity).

[0050] [Effects of the Embodiment] According to the above embodiment, by positioning the bottom wall member 40 in the second position, dust accumulated on the bottom wall member 40 can be discharged to the outside of the engine building 24 along the downward-sloping plate-shaped member 43. This reduces the workload on workers inside the equipment housing chamber 35. As a result, clogging of the heat exchanger 29 by dust inside the equipment housing chamber 35 becomes less likely. To assist in dust discharge, the left side wall 31 may be opened and air may be blown from the left side onto the upper surface of the plate-shaped member 43 using a blower. Furthermore, by positioning the bottom wall member 40 in the first position while the wheel loader 10 is in operation, the contact area between the cooling air inside the equipment housing chamber 35 and the heat exchanger 29 increases compared to the second position. This suppresses a decrease in the heat exchange efficiency of the heat exchanger 29.

[0051] Furthermore, according to the above embodiment, the bottom wall member 40 can be made lighter by making the plate-shaped member 43 out of rubber. This reduces the workload on the operator who rotates the bottom wall member 40 from the first position to the second position.

[0052] Furthermore, according to the above embodiment, during the rotation of the bottom wall member 40 between the first and second positions, the conduit 39 comes into contact with the peripheral wall defining the through hole 43c. At this time, by making the plate-shaped member 43 out of rubber and providing a slit 43d, the plate-shaped member 43 that comes into contact with the conduit 39 undergoes elastic deformation. This prevents the conduit 39 from hindering the rotation of the bottom wall member 40.

[0053] Furthermore, since the through-hole 43c does not need to be made unnecessarily large to avoid interference with the pipeline 39, it is possible to prevent dust from falling through the through-hole 43c to the bottom wall member 40 (for example, on top of the fuel tank 38b). In addition, by positioning the pipeline 39 and the through-hole 43c closer to the left end of the plate-shaped member 43 (the end that is located upward in the second position), and by extending the slit 43d toward the left end of the plate-shaped member 43 (the end that is located upward in the second position), the slit 43d can be shortened, and when the bottom wall member 40 is in the second position, it is possible to prevent dust sliding down on the plate-shaped member 43 from falling through the slit 43d.

[0054] Furthermore, according to the above embodiment, by allowing the tongue-shaped portions 43a and 43b at both ends of the plate-shaped member 43 to hang downward along the outer surface of the rear frame 12, dust on the plate-shaped member 43 can be prevented from falling through the gap in the left-right direction between the rear frame 12 and the bottom wall member 40.

[0055] Furthermore, according to the above embodiment, by arranging the partition sections 41b and 42b in front of and behind the plate-shaped member 43, it is possible to prevent dust on the plate-shaped member 43 from falling through the gap in the front-rear direction between the partition wall 34 and the partition section 41b, and the gap in the front-rear direction between the heat exchanger 29 and the partition section 42b.

[0056] Furthermore, according to the above embodiment, by sloping the plate-shaped member 43 downward toward the rear, dust on the plate-shaped member 43 can be collected toward the rear (i.e., toward the partition 42b). This reduces the burden of work inside the equipment housing chamber 35.

[0057] Furthermore, according to the above embodiment, by holding the rotating tip of the bottom wall member 40 with catches 48 and 49, it is possible to prevent the bottom wall member 40 from flapping when the wheel loader 10 is in operation (for example, when driving on rough terrain). On the other hand, when rotating the bottom wall member 40 from the first position to the second position, the operator does not need to perform any operation to release the fixing of the bottom wall member 40, so the workload of the operator is further reduced.

[0058] Furthermore, according to the above embodiment, by holding the bottom wall member 40 in the second position with the holding member 50, cleaning of the inside of the equipment housing chamber 35 and the top surface of the fuel tank 38b can be done with both hands. For example, even if dust enters between the bottom surface of the bottom wall member 40 and the top surface of the fuel tank 38b and accumulates on the top surface of the fuel tank 38b, a blower can be inserted under the bottom wall member 40, which is held in the second position, to sweep out the dust. This reduces the burden of work inside the equipment housing chamber 35.

[0059] Furthermore, according to the above embodiment, the plate-shaped member 43 is made detachable from the support members 41 and 42. This makes it possible to remove the plate-shaped member 43 and secure a large maintenance opening for maintenance of the area below the bottom wall member 40 (for example, the fuel tank 38b). This is effective when a larger maintenance opening is required, even though it is possible to access the top surface of the fuel tank 38b by placing the bottom wall member 40 in the second position. This makes it easier to clean, for example, dust accumulated on the top surface of the fuel tank 38b, thereby improving the maintainability of the wheel loader 10.

[0060] Furthermore, according to the above embodiment, by connecting the pair of support members 41 and 42 with a gripping portion 46 that the operator grips when rotating the bottom wall member 40, the shape of the bottom wall member 40 can be maintained while suppressing an increase in the number of components.

[0061] The embodiments described above are illustrative for explaining the present invention and are not intended to limit the scope of the invention to those embodiments only. Those skilled in the art can implement the present invention in various other forms without departing from the spirit of the invention. [Explanation of Symbols]

[0062] 10: Wheel loader 11: Front frame 12: Rear frame 13: Center Pin 14L, 14R: Steering Cylinder 15L, 15R: Front tire 16: Front work machine 17: Lift Arm 18: Bucket 19: Lift Arm Cylinder 20: Bucket Cylinder 21: Bell Crank 22L, 22R: Rear tire 23: Driver's cab 24: Engine building 25: Counterweight 26: Engine (prime mover) 27: Post-processing equipment 28: Cooling fan 29:Heat exchanger 29a: Heat exchange section 30: Upper wall 31: Left side wall 32: Back wall 33: Front wall 34: Bulkhead 35: Equipment storage room 36,37 :Aperture 38a: Urea tank 38b: Fuel tank 39: Conduit 40: Bottom wall member 41,42: Support members 41a, 42a: Support part 41b, 42b: Partition section 43: Plate-shaped member 43a, 43b: Tongue piece part 43c: Through hole 43d: Slit 44,45: Hinge 46:Gripping part 47: Bolt 48,49: Catch 50: Retaining member 51: Holding part 52 :Holded part X1, X2, X3: Rotary axes

Claims

1. A vehicle body that supports a building in which an equipment storage room is formed inside, A cooling fan is positioned behind the equipment housing chamber and discharges the air that flows into the equipment housing chamber through an opening formed in the outer wall of the building as cooling air to the rear of the vehicle body. A working machine comprising a heat exchanger positioned between the equipment housing chamber and the cooling fan, which exchanges heat between the cooling air and a fluid passing through it, The equipment housing is provided with a bottom wall member that forms the bottom surface of the equipment housing, with one end in the vehicle width direction supported by the vehicle body by a pivot shaft extending in the front-rear direction, and the other end in the vehicle width direction being rotatable vertically around the pivot shaft. The bottom wall member is In a first position, the other end is positioned below the heat exchange section of the heat exchanger through which the cooling air passes, A work machine characterized in that the other end is configured to be rotatable between a first position and a second position in which the other end is located above the first position.

2. In the work machine described in claim 1, The bottom wall member is A pair of support members are positioned at the front and rear ends of the equipment housing chamber, each extending in the vehicle width direction, A work machine characterized by comprising a pair of support members and a rubber plate-shaped member that forms the bottom surface of the equipment housing chamber.

3. In the work machine described in claim 2, The plate-shaped member includes, A through hole that penetrates in the thickness direction, A slit is formed extending from the through hole to the other end of the plate-shaped member in the vehicle width direction. The work machine is characterized in that the through hole is provided on the other end side of the bottom wall member in the vehicle width direction of the plate-shaped member.

4. In the work machine described in claim 2, A work machine characterized in that tongue-shaped portions are formed at both ends of the plate-shaped member in the vehicle width direction, each portion hanging downward along the outer surface of the vehicle body.

5. In the work machine described in claim 2, The aforementioned support member is A support portion that supports the lower surface of the plate-shaped member, A work machine characterized by having a support portion and a partition portion erected from the support portion to above the upper surface of the plate-shaped member.

6. In the work machine described in claim 5, The aforementioned plate-like member is characterized by being sloped downward toward the rear.

7. In the work machine described in claim 1, A work machine characterized by comprising a resistance member that biases the bottom wall member downward.

8. In the work machine described in claim 1, A work machine characterized by comprising a holding member that can switch between a holding state in which the bottom wall member is held in the second position and a permissible state in which rotation of the bottom wall member from the second position to the first position is permitted.

9. In the work machine described in claim 2, The work machine is characterized in that the plate-shaped member is detachably supported by a pair of support members.

10. In the work machine described in claim 2, The work machine is characterized in that the bottom wall member connects a pair of support members to each other and includes a gripping portion that grips the bottom wall member when it is rotated from the first position to the second position.

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