Rain intrusion prevention structure to engine room and work vehicle

Abstract

To provide a rain intrusion prevention structure for an engine room and a work vehicle, capable of improving the effect of preventing rain intrusion into the engine room from an air intake cover, and improving the cooling function of a condenser.SOLUTION: A rain intrusion prevention structure 40 comprises: an air intake cover 23 fixed on an engine cover 18 having an inclined part of which height becomes lower from a cabin 15 side to a rear door 19 side; and a first rain gutter 50 below an air intake opening of the air intake cover 23 and extending horizontally in the vehicle width direction; a second rain gutter 60 that is placed below the first rain gutter 50 and receives rain water flowing out from an end part of the first rain gutter 50 in the vehicle width direction and guides it toward the rear door 19 side; and a third rain gutter 80 that is placed on the inner side of the upper edge of the rear door 19 and receives rain water flowing out from the second rain gutter 60 and discharges it to the outside of the engine room 20.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a structure for preventing rainwater from entering an engine compartment and a work vehicle. [Background technology]

[0002] As a work vehicle, for example, a crawler-type skid steer loader and a hydraulic excavator (also called a power shovel, an excavator, a backhoe, etc.) that are used for excavating the ground and moving excavated soil and sand are widely known. Such work vehicles have a condenser cooling mechanism. The condenser cooling mechanism flows heat-exchanged outside air into the engine compartment. In the work vehicle, the cooling mechanism is provided on the lower inside of the engine cover or on the inside of the outside air intake. The cooling mechanism on the engine cover side is structured to take in outside air from an intake cover having an intake opening attached to the engine cover. However, rainwater may enter the engine compartment from the intake opening together with the outside air, and the intruding rainwater may cause malfunctions in the engine and devices attached to the engine. Therefore, a rainwater intrusion prevention structure is adopted in the work vehicle to prevent rainwater entering from the intake cover from entering the engine compartment.

[0003] One example of a rainwater intrusion prevention structure provided in a work vehicle is one in which a drainage mechanism is arranged below a first ventilation section provided in an engine cover. This drainage mechanism is composed of a tray member that receives rainwater that intrudes from the first ventilation section, and a water guide member that is located below the tray member and guides rainwater stored in the tray member to the outside. The tray member is a tray-shaped member that is composed of a bottom plate with a through hole and a side plate that extends upward from the outer periphery of the bottom plate. In addition, the water guide member is arranged below the through hole opened at the corner of the bottom plate of the tray member, and discharges the rainwater received by the tray member from an outlet provided between the bottom plate of the water guide member and a partition wall that defines the engine compartment and the cooling compartment. Outside air for cooling is mainly taken in from an intake section that is located above the cooling device (see, for example, Patent Document 1).

[0004] Another example of a rainwater intrusion prevention mechanism provided in a work vehicle is a ventilation cover unit including a drainage mechanism disposed in an upper cover part constituting an engine cover. The ventilation cover unit is disposed in the upper cover part constituting an engine cover. The upper cover part is disposed diagonally above the engine and inclined with respect to the vertical direction. The ventilation cover unit is disposed along the inclination of the upper cover part, and the exterior ventilation cover part and the interior ventilation cover part are integrally configured in a container shape having an internal space. The exterior ventilation cover part has an exterior ventilation hole, and the interior ventilation cover part is provided inside the exterior ventilation cover part, and has a rain gutter part that receives rainwater that has infiltrated from the exterior ventilation hole and an interior ventilation hole that is disposed above the rain gutter part, and separates the outside air that infiltrates from the exterior ventilation cover part from the rainwater. A water drain hole is provided at the lower end of the rain gutter part, and the rainwater is discharged from this water drain hole to the outside (for example, see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2014-128911 [Patent Document 2] International Publication No. 2015-079764 Summary of the Invention [Problem to be solved by the invention]

[0006] The rainwater intrusion prevention structure described in Patent Document 1 is capable of discharging rainwater that intrudes through the first ventilation section because the tray member is arranged to overlap the first ventilation section. However, because the outside air that enters the engine compartment from the first ventilation section is blocked by the tray member, there is a problem that it is difficult to achieve both the rainwater intrusion prevention function and the function of increasing the passing area of ​​the outside air that passes through the condenser to increase the cooling effect of the air conditioner, particularly in a work vehicle that has a cooling device (such as a condenser) located above the engine.

[0007] In addition, the rainwater intrusion prevention structure described in Patent Document 2 has a ventilation cover unit that is integrally formed into a container shape having an internal space with an external ventilation cover part and an internal ventilation cover part. Rainwater that intrudes from the external ventilation hole is received by the rain gutter part on the lower side, and can be discharged to the outside from a water drain hole provided at the lower end of the rain gutter part. This ventilation cover unit has a vertical configuration that is inclined with respect to a vertical line, and is configured to separate rainwater and outside air between the lower rain gutter part and the upper ventilation part. Therefore, as in Patent Document 1, in a work vehicle that has a cooling device (such as a condenser) arranged on the top of the engine, there is a problem that it is difficult to achieve both the rainwater intrusion prevention function and the function of increasing the passing area of ​​the outside air that passes through the condenser to enhance the cooling effect of the air conditioner.

[0008] Therefore, the present invention has been made to solve such problems, and aims to provide a "structure for preventing rainwater from entering the engine compartment" that increases the effectiveness of preventing rainwater from entering the engine compartment from the intake cover and also increases the cooling function of the condenser, and a work vehicle equipped with a structure for preventing rainwater from entering the engine compartment. [Means for solving the problem]

[0009] [1] The structure for preventing rainwater from entering an engine compartment of the present invention comprises an intake cover disposed at an upper portion of the engine compartment, the engine cover having a sloping portion whose height decreases from the cabin side to the rear door side, the intake cover having an intake opening and fixed to the engine cover along the sloping portion, a rainwater receiving portion disposed below the intake opening, extending horizontally in the vehicle width direction, and receiving rainwater entering from the intake opening, and an intake flow passage portion which separates outside air entering together with the rainwater and flows it toward the engine compartment. a second rain gutter having a central opening facing a condenser, a first rain gutter extending from the cabin side to the rear door side along the inclined portion below the first rain gutter and receiving rainwater flowing out from the end of the first rain gutter in the vehicle width direction and directing it to the rear door side, an air intake flow path separating outside air that enters together with the rainwater and directing it toward the engine compartment, and a third rain gutter disposed inside an upper edge of the rear door, extending in the vehicle width direction, receiving rainwater flowing out from the second rain gutter and discharging it to the outside of the engine compartment.

[0010] [2] In the structure for preventing rainwater from entering an engine compartment of the present invention, the intake cover is composed of an open bottom portion, a top portion having an area smaller than the bottom portion, and a side portion connecting the bottom portion and the top portion, and has a space surrounded by the top portion and the side portion, the intake opening is positioned in a position covering the intake openings provided on the top portion and the side portion, the first rain gutter is positioned inside the space, and the rainwater receiving portion is positioned directly below the intake opening provided on the top portion, and at a position facing the intake opening, it is preferable that the rainwater receiving portion has an area at least larger than the intake opening in a planar view.

[0011] [3] In the structure for preventing rainwater from entering the engine compartment of the present invention, it is preferable that the first rain gutter is provided corresponding to each of the intake openings, which are partitioned into multiple sections on the upper surface of the intake cover, and that each is arranged parallel to the inclined portion at a predetermined interval.

[0012] [4] In the structure for preventing rainwater from entering the engine compartment of the present invention, it is preferable that the first rain gutter has a bottom plate portion inclined along the inclined portion, a rear wall portion extending from the rear door side end of the bottom plate portion and connected to the intake cover, and a front wall portion extending from the cabin side end of the bottom plate portion and connected to the intake cover, and the front wall portion has a dam portion of a height that rainwater of an expected amount of rainfall will not exceed, and the intake flow path portion is formed between the dam portion and the intake cover, and the vehicle width direction end of the first rain gutter is open.

[0013] [5] In the structure for preventing rainwater from entering an engine compartment of the present invention, the rainwater flow path portion of the second rain gutter is composed of a bottom plate portion, an inner wall portion extending from the peripheral portion of the central opening of the bottom plate portion toward the first rain gutter, and an outer wall portion extending from the inner wall portion toward the first rain gutter with a predetermined flow path width, the height of the inner wall portion from the bottom plate portion is a height that will not be exceeded by rainwater of an expected amount of rainfall and is lower than the height of the outer wall portion, and an intake flow path portion is formed between the inner wall portion and the first rain gutter, and a dam plate having an L-shaped cross section is arranged at the rear door side end of the second rain gutter, crossing the second rain gutter in the vehicle width direction, and the dam plate has an opening whose L-shaped vertical piece flows from the rainwater flow path portion to the third rain gutter, and a horizontal piece extends so as to intersect above the third rain gutter.

[0014] [6] In the structure for preventing rainwater from entering the engine compartment of the present invention, it is preferable that the distance from the vehicle width direction end of the first rain gutter to the inner wall portion of the second rain gutter is longer than the distance from the bottom plate portion of the first rain gutter to the bottom plate portion of the second rain gutter, and the height of the inner wall portion is set to a height that does not create resistance to the outside air flowing through the intake flow passage portion.

[0015] [7] In the structure for preventing rainwater from entering the engine compartment of the present invention, it is preferable that the third rain gutter has an L-shaped cross section, extends across the width of the vehicle, has a vertical piece of the L-shape fixed to the inside of the upper edge of the rear door, and has a horizontal piece extending to a position where it can intersect with the end of the second rain gutter on the rear door side, a sealing material is attached to the peripheral tip edge of the horizontal piece on the second rain gutter side, a rainwater flow path portion is formed in the area surrounded by the vertical piece, the vertical piece and the sealing material, and at least one of the vehicle width direction ends of the rainwater flow path portion is closed.

[0016] [8] The work vehicle of the present invention is characterized by having a vehicle body, a pair of left and right traveling devices having crawlers arranged below both ends of the vehicle width direction of the vehicle body, a main body frame to which the traveling devices are attached, a work device attached to the main body frame, a cabin arranged in the upper center of the main body frame, and a structure for preventing rainwater from entering the engine compartment described above in [1] to [7]. Effect of the Invention

[0017] In the "structure for preventing rainwater from entering an engine compartment" of the present invention, an intake cover that is inclined along an inclined portion 21 is fixed to an engine cover having an inclined portion that decreases in height from the cabin side to the rear door side. The intake cover has an intake opening. The first rain gutter is located below the intake opening and extends horizontally in the vehicle width direction. The first rain gutter receives rainwater that enters from the intake opening in a rainwater receiving portion and directs it to the second rain gutter. The first rain gutter is configured to separate outside air that enters together with the rainwater by an intake flow path portion and direct it toward the condenser from a central opening.

[0018] The second gutter is located below the first gutter and extends from the cabin side to the rear door side along the inclined portion. The second gutter receives rainwater flowing out from the ends of the first gutter in the vehicle width direction and rainwater entering through the intake opening of the intake cover in the rainwater flow path, and directs it to the third gutter. The second gutter is also configured to separate outside air entering from the intake cover together with the rainwater in the intake flow path, and direct it from the central opening toward the condenser.

[0019] The third rain gutter is disposed on the inside of the upper edge of the rear door, extends in the vehicle width direction, receives rainwater flowing out from the second rain gutter, and discharges it to the outside from the vehicle width end of the engine compartment.

[0020] In the "structure for preventing rainwater from entering the engine compartment" of the present invention, the first rain gutter, second rain gutter, and third rain gutter, which have different rainwater flow directions, are combined to disperse and drain the rainwater that enters through the intake cover, making it possible to discharge the rainwater that enters through the intake cover to the outside of the engine compartment.

[0021] The first gutter separates the outside air that enters together with the rainwater through the intake air passage and directs it from the central opening of the second gutter toward the condenser. The second gutter separates it at the intake air passage and directs it from the central opening into the engine compartment. A space is defined between the first gutter and the condenser, and a wide space that does not impede the flow of outside air is defined above the condenser, including the space and the central opening. This makes it possible to send sufficient outside air to the condenser, enabling the condenser to sufficiently cool the outside air.

[0022] According to the rainwater intrusion prevention structure described above, it is possible to improve the effect of preventing rainwater from infiltrating from the intake cover into the engine compartment, and also to improve the cooling function of the condenser for the sucked-in outside air. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view showing an overview of an example of a work vehicle 1 as viewed from the rear side. [Diagram 2] FIG. 2 is a perspective view showing a state in which the engine cover 18 and the rear door 19 are open. [Diagram 3] 2 is a cross-sectional view showing an outline of the configuration relating to the rainwater intrusion prevention structure 40 taken along the line XX in FIG. 1. [Figure 4] 11 is a view showing the intake cover 23 with the first rain gutter 50 installed therein. FIG. [Diagram 5] 4 is an exploded assembly view showing the configuration of a first rain gutter 50 and an intake plate 38. FIG. [Figure 6] 6 is a diagram showing the configuration of a second rain gutter 60 and the relative positions of first rain gutters 50A to 50D. FIG. [Figure 7] 4 is a schematic diagram showing the flow of outside air and rainwater in a first rain gutter 50A and a second rain gutter 60. FIG. [Figure 8] 2 is a perspective view showing the relationship between a second rain gutter 60 and a third rain gutter 80. FIG. [Figure 9] 11 is a perspective view showing the configuration of a third rain gutter 80. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a "structure 40 for preventing rainwater from entering into the engine compartment 20" and a work vehicle 1 according to an embodiment of the present invention will be described with reference to Figures 1 to 9. In the following description, the "structure 40 for preventing rainwater from entering into the engine compartment 20" may be simply referred to as the "structure 40 for preventing rainwater from entering." Furthermore, each of the drawings described below is a schematic diagram having a different scale, aspect ratio, etc. from the actual one.

[0025] (Configuration of Work Vehicle 1) FIG. 1 is a perspective view showing an overview of one configuration example of a work vehicle 1 as seen from the rear side. In FIG. 1, the direction of each part relative to a vehicle body 10 is indicated by an arrow. That is, the arrow indicates the forward direction of the work vehicle 1 as the front, the backward direction as the rear, the right side as viewed in the forward direction as the right, and the left side as viewed in the left direction. The work vehicle 1 has a pair of left and right traveling devices 12, 12 composed of crawlers 11 below both ends in the vehicle width direction relative to the vehicle body 10. The traveling devices 12, 12 are attached to a main body frame 13. The main body frame 13 has a working device 14 attached to the front side, and a cabin 15 is disposed in the upper center.

[0026] The working device 14 has a pair of arms 16 disposed on either side of the cabin 15, and a pair of left and right hydraulic cylinders 17 attached across the main body frame 13 and the arms 16. Although not shown, the working device 14 further has a working tool such as a bucket attached to the front end of the arm 16 via a bracket.

[0027] The work vehicle 1 is configured so that an operator can seat inside the cabin 15 and operate an operating lever (not shown) to cause the vehicle to travel, swing the arm 16 up and down, and swing the bucket up and down.

[0028] The work vehicle 1 also has an engine EG (see FIG. 2) disposed inside an engine compartment 20, which is a space defined by the main body frame 13 on the left and right, an engine cover 18 on the upper side, and a rear door 19 on the rear side. The engine cover 18 has a sloping section 21 whose height decreases going from the cabin 15 side to the rear door 19 side. The engine cover 18 has an opening 22 (see FIG. 3) in the center facing the engine compartment 20, and an intake cover 23 is disposed to close this opening 22. The detailed configuration of the intake cover 23 will be described later with reference to FIG. 4.

[0029] The engine cover 18 can be opened and closed in the vertical direction on the rear door 19 side, with a hinge (not shown) on the cabin 15 side as a fulcrum. The engine cover 18 is held in a closed state against the body frame 13 by an engine cover lock mechanism 24 during normal operation, and is configured to be able to be opened upward during maintenance and the like. On the other hand, the rear door 19 can be opened to the left side in a plan view on the right side, with hinge mechanisms 31A, 31B (see FIG. 2) provided between the left body frame 13 and the rear door frame 27 as a fulcrum. The rear door 19 is normally held in a closed state by a rear door lock mechanism (not shown).

[0030] FIG. 2 is a perspective view showing a state in which the engine cover 18 and the rear door 19 are open. The configuration of the work vehicle 1 is the same as that shown in FIG. 1, and therefore the same components are denoted with the same reference numerals as in FIG. 1. When the engine cover lock mechanism 24 is operated to open the engine cover 18, the engine cover 18 opens the engine compartment 20 upward together with the intake cover 23 fixed to the upper side, the condenser 25 fixed to the lower side, and the intake fan 26. The space in which the engine EG is disposed is defined as the engine compartment 20. The condenser 25 exchanges heat with the intake outside air and flows it into the engine compartment 20. The intake fan 26 draws in the outside air from the intake opening 36 through the condenser 25. The intake cover 23 and the engine cover 18 each have a first rain gutter 50 (see FIG. 4 and FIG. 5), a second rain gutter 60 (see FIG. 6), and a third rain gutter 80 (see FIG. 8), which are main components of a rainwater intrusion prevention structure 40 described later.

[0031] 2, when the rear door 19 is opened by releasing the lock using a rear door lock mechanism (not shown), the radiator 30 appears. A fan shroud and a radiator fan (both not shown) are provided between the radiator 30 and the engine EG. The radiator 30 is supported so as to be openable and closable in the left-right direction by hinge mechanisms 32A, 32B provided at two positions, one above and one below, on the left side of the main body frame 13 and the radiator frame 33. A third rain gutter 80, which is a main component of a rainwater intrusion prevention structure 40 described later, is attached to the inner upper edge of the rear door 19.

[0032] In the work vehicle 1 described above, the condenser cooling mechanism is provided above the engine EG or inside the outside air intake. The condenser cooling mechanism above the engine EG takes in outside air for cooling from the intake opening 36 (see FIG. 3) of the intake cover 23. However, from the intake opening 36, rainwater enters the engine compartment 20 through the condenser 25 together with the outside air. In addition, the rainwater that enters the engine compartment 20 may cause malfunctions in the engine EG and devices attached to the engine EG. Therefore, the work vehicle 1 is provided with a rainwater intrusion prevention structure 40 that can prevent rainwater from entering the engine compartment 20 from the intake cover 23 and can draw sufficient outside air for cooling into the condenser 25. Next, the configuration of the rainwater intrusion prevention structure 40 will be described.

[0033] (Configuration of rainwater intrusion prevention structure 40) FIG. 3 is a cross-sectional view showing an outline of the configuration related to the rainwater intrusion prevention structure 40 taken along the line XX in FIG. 1. In FIG. 3, the right side of the figure shows a configuration in which the first rain gutter 50 and the second rain gutter 60 are attached to the engine cover 18 (indicated by the symbol A). The left side of the figure shows a configuration in which the third rain gutter 80 is attached to the rear door 19 (indicated by the symbol B). Note that a well-known engine cover lock mechanism 24 can be used, so a description thereof will be omitted. The intake cover 23 is fixed to the upper side of the engine cover 18. In the space portion 35 of the intake cover 23, the first rain gutters 50A, 50B, 50C, and 50D are arranged in order from the front (cabin 15 side) with a predetermined interval between them. The first rain gutters 50A to 50D have the same shape. Note that the first rain gutters 50A to 50D may be collectively referred to as the first rain gutter 50. The space 35 of the intake cover 23 opens toward the engine compartment 20 .

[0034] The engine cover 18 has an opening 22 in the center. The intake cover 23 is arranged to cover the opening 22. The intake cover 23 has an intake opening 36. An intake plate 38 is fixed to the inside of the upper surface of the intake cover 23 so as to close the intake opening 36. A large number of through holes 39 (see FIG. 5) are formed in the intake plate 38. The intake plate 38 is configured to prevent foreign matter such as dust from entering the engine compartment 20 while not interfering with the intake of outside air. The first rain gutter 50 is arranged directly below the intake opening 36 and is capable of receiving rainwater entering through the through hole 39. The first rain gutter 50 is arranged inside the space 35 of the intake cover 23. The configurations of the engine cover 18, the intake cover 23, and the first rain gutter 50 will be described in more detail with reference to FIG. 4 and FIG. 5.

[0035] A second rain gutter 60 is disposed below the intake cover 23 with the engine cover 18 in between. The second rain gutter 60 is disposed below both ends of the first rain gutter 50 in the vehicle width direction along the slope of the sloped portion 21 (see FIG. 1) of the intake cover 23, and extends from the end on the upper side (cabin 15 side) to the end on the lower side (rear door 19 side). The second rain gutter 60 collects rainwater flowing out from both ends of the first rain gutter 50 in the vehicle width direction, directs it to the rear door 19, and directs it to a third rain gutter 80 attached to the inside of the upper edge of the rear door 19. The detailed configuration of the second rain gutter 60 will be described in more detail with reference to FIG. 6.

[0036] The condenser 25 is disposed below the second rain gutter 60, and the intake fan 26 is disposed below the condenser 25. Note that the method of assembling the intake cover 23, the first rain gutter 50, the second rain gutter 60, the condenser 25, the intake fan 26, and the engine cover 18 can be performed using well-known assembly methods such as auxiliary fixing members, bolts, nuts, or welding, and therefore a description thereof will be omitted.

[0037] The third rain gutter 80 is disposed across the vehicle width on the inside of the upper edge of the rear door frame 27 constituting the rear door 19. The third rain gutter 80 collects rainwater flowing out from the end of the second rain gutter 60 on the rear door 19 side and discharges it to the outside of the engine compartment 20. The third rain gutter 80 has an L-shape and is composed of a horizontal piece 81 and a vertical piece 82 extending toward the second rain gutter 60 side, and a packing 83 as a sealing member is attached to the end of the horizontal piece 81 on the second rain gutter 60 side. The third rain gutter 80 is configured to be able to come into close contact with the underside 75 of the rear door side end of the second rain gutter 60 via the packing 83 when the rear door 19 is closed.

[0038] In addition, the space 35 of the intake cover 23 and the central opening 63 (see FIG. 6) that is opened widely in the center of the second rain gutter 60 communicate with the space 34 above the condenser 25. Therefore, the flow of outside air entering from the intake cover 23 by the intake fan 26 is not impeded, and the passing area of ​​the cooling air passing through the condenser 25 can be made large.

[0039] (Configuration of first rain gutter 50) FIG. 4 is a diagram showing the intake cover 23 with the first gutter 50 incorporated therein. FIG. 4(a) is an external perspective view seen from above, and FIG. 4(b) is a cross-sectional view taken along the XX line in FIG. 4(a). The intake cover 23 is composed of a bottom surface portion 41 with an open surface facing the opening 22 (see FIG. 3) provided in the engine cover 18, an upper surface portion 42 facing the bottom surface portion 41 and having a smaller area than the bottom surface portion 41, and side portions 43a, 43b, 43c, and 43d connecting the bottom surface portion 41 and the upper surface portion 42. The intake cover 23 has a space portion 35 (see FIG. 4(b)) surrounded by the upper surface portion 42 and the side portions 43a to 43d. That is, the shape of the intake cover 23 can be said to be a hollow quadrangular pyramid when viewed from the outside. Four intake openings 36 are provided on the upper surface 42 of the intake cover 23, and an intake plate 38 having a number of through holes 39 (see Figure 5) is fixed to the inside of the upper surface 42 so as to cover the intake openings 36.

[0040] Further, the side portions 43a, 43b arranged in the left-right direction are provided with intake openings 44a, 44b, respectively, and an intake plate 45 having a number of through holes 39 is fixed to the inside of the intake cover 23 so as to cover the intake openings 44a, 44b. Meanwhile, the side portions 43c, 43d arranged in the front-rear direction are provided with intake openings 44c, 44d, respectively, and an intake plate 46 having a number of through holes 39 is fixed to the inside of the intake cover 23 so as to cover the intake openings 44c, 44d. Fixing portions 47, 48 for attaching the intake cover 23 to the engine cover 18 extend from the front side (cabin 15 side) and the rear side (rear door 19 side). First rain gutters 50A-50B are arranged in the space portion 35 of the intake cover 23.

[0041] As shown in FIG. 4(b), the first rain gutter 50A is made up of a bottom plate portion 51 that is inclined along the inclined portion 21 (see FIG. 1), and a rear wall portion 52 that extends upward from the rear end portion (the end portion on the rear door 19 side) of the bottom plate portion 51 and is connected to the intake cover 23. The first rain gutter 50A is further made up of a front wall portion 53 that extends upward from the front end portion (the end portion on the cabin 15 side) of the bottom plate portion 51 and is connected to the intake cover 23. The front wall portion 53 has a dam portion 54 that is at a height that will not be exceeded by rainwater of an expected amount of rain, and an intake flow path portion 55 is formed between the dam portion 54 and the intake cover 23.

[0042] The area sandwiched between the bottom plate portion 51, the rear side wall portion 52, and the weir portion 54 becomes the rainwater receiving portion 56, which becomes a flow path for rainwater that has entered through the intake opening 36. The rainwater receiving portion 56 is disposed directly below the intake opening 36 provided on the upper surface portion 42, and the side connected to the intake cover 23 has an area at least larger than the intake opening 36 in a plan view. Rainwater that has entered the interior from the intake opening 36 (shown by a solid line in the figure) is received by the rainwater receiving portion 56 and sent to the second rain gutter 60 from the end in the vehicle width direction. On the other hand, outside air that has entered the interior from the intake opening 36 (shown by a dotted line in the figure) flows through the intake flow path portion 55 to the condenser 25 (see FIG. 3). The first rain gutter 50B to 50D have the same configuration as the first rain gutter 50A, so a description thereof will be omitted. An end portion of the first rain gutter 50 in the vehicle width direction (left and right direction) is opened, and configured so that rainwater received in the rainwater receiving portion 56 can be discharged to the second rain gutter 60.

[0043] 5 is an exploded assembly diagram showing the configurations of the first rain gutter 50 and the intake plate 38. As described above, the first rain gutter 50 is made up of the bottom plate portion 51, the rear wall portion 52, and the front wall portion 53. The end portion of the rear wall portion 52 facing the intake cover 23 is formed with three protrusions 57. The front wall portion 53 is formed with a dam portion 54 that is lower in height than the rear wall portion 52, and three pillar portions 58 that extend from the dam portion 54 toward the intake cover 23 side.

[0044] The intake plate 38 is composed of a rectangular plate-like member with a large number of through holes 39. The intake plate 38 has cutouts 38a formed on the rear and front side surfaces. The cutout 38a provided on the rear side has a shape that allows the protrusion 57 of the first rain gutter 50 to be fitted therein.

[0045] Next, referring to FIG. 5, the assembly structure of the first rain gutter 50 will be described. The intake plate 38 is fixed to the inner surface 23a of the intake cover 23 at the periphery of the intake opening 36. The first rain gutter 50 is abutted against the inner surface 23a of the intake cover 23 while fitting the protrusion 57 of the rear wall portion 52 into the cutout portion 38a of the intake plate 38. The first rain gutter 50 is connected to the intake cover 23 by abutting the pillar portion 58 of the front wall portion 53 against the inner surface 23a of the intake cover 23 outside the intake plate 38. In the first rain gutter 50 thus assembled to the intake cover 23, the space formed by the weir portion 54, the space between the adjacent pillar portions 58, and the inner surface 23a of the intake cover 23 constitutes the intake flow path portion 55. The area surrounded by the bottom plate portion 51, the rear wall portion 52, and the weir portion 54 constitutes the rainwater receiving portion 56.

[0046] Here, rainwater entering through the intake opening 36 flows out into the second rain gutter 60 without passing over the weir portion 54. Outside air entering through the intake opening 36 passes over the weir portion 54 and flows from the intake air flow path portion 55 in the direction of the engine compartment 20. In other words, it can be said that the weir portion 54 separates the rainwater entering through the intake opening 36 from the outside air.

[0047] (Configuration of second rain gutter 60) FIG. 6 is a diagram showing the configuration of the second rain gutter 60 and the relative positions of the first rain gutters 50A-50D. FIG. 6(a) is a perspective view seen from above, and FIG. 6(b) is a front view seen from the rear side of FIG. 6(a). The second rain gutter 60 is a member configured in a tray shape, and is disposed below the first rain gutters 50A-50D. The second rain gutter 60 is bent in the up-down direction midway in the front-rear direction. The area forward of the reference character A (toward the cabin 15) is an area that is inclined along the inclined portion 21 of the engine cover 18, and the area rearward of the reference character A (toward the rear door 19) is an approximately horizontal area.

[0048] The second rain gutter 60 has a central opening 63 facing the condenser 25 (see FIG. 3). The second rain gutter 60 has a rainwater channel portion 61 that receives rainwater flowing out from both left and right ends (both ends in the vehicle width direction) of the first rain gutter 50 and rainwater entering from the intake openings 44a to 44d (see FIG. 4) arranged in the side portions 43a to 43d of the intake cover 23, and channels the rainwater to the rear side (rear door 19 side). The rainwater channel portion 61 is composed of rainwater channel portions 61a, 61b extending in the front-rear direction at both left and right ends (vehicle width direction), and a rainwater channel portion 61c that connects the rainwater channel portion 61a and the rainwater channel portion 61b at the front side end.

[0049] The rainwater flow passages 61a, 61b, 61c are connected at their bottoms by a bottom plate 62 which serves as a base plate for the second rain gutter 60. The rainwater flow passage 61 is composed of the bottom plate 62 which connects the entirety, an inner wall 64 which extends from the periphery of a central opening 63 of the bottom plate 62 to the first rain gutter 50 side, and an outer wall 65 which extends from the inner wall 64 to the first rain gutter 50 side from the bottom plate 62 with a predetermined flow passage width. The outer wall 65 does not exist on the rear side (rear door 19 side). The height of the inner wall 64 from the bottom plate 62 is a height which the expected amount of rainwater will not exceed, and is lower than the height of the outer wall 65 from the bottom plate 62.

[0050] The rainwater flow paths 61a, 61b, and 61c are inclined so that the rear side (the rear door 19 side) is lower, so that the received rainwater flows to the rear side (the rear door 19 side). At the rear end, the bottom plate 62 is divided into a bottom plate 62a and a bottom plate 62b, and a notch hole 66 is formed between the bottom plate 62a and the bottom plate 62b, penetrating in the thickness direction. The notch hole 66 is an escape hole for not interfering with the operation of the engine cover lock mechanism 24. A dam frame 67 is provided on the periphery of the notch hole 66. The dam frame 67 is provided to prevent the rainwater flowing from the rainwater flow paths 61a and 61b from flowing into the engine cover lock mechanism 24.

[0051] A dam plate 68 is disposed at the rear end (rear door 19 side end) of the second rain gutter 60, traversing the second rain gutter 60 in the left-right direction (vehicle width direction). The dam plate 68 is L-shaped, and an L-shaped vertical piece 69 is attached to a slit 65a (see FIG. 6(a)) provided in the outer wall portion 65. The height of the dam plate 68 from the bottom plate portions 62a, 62b is determined by the depth of the slit 65a. The L-shaped horizontal piece 70 of the dam plate 68 is divided into three parts and is composed of protruding portions 68a, 68b, 68c arranged at intervals. In addition, protruding portions 71a, 71b, 71c, 71d are formed at the tips of the rear side (rear door 19 side) of the bottom plate portions 62a, 62b, protruding rearward and having their extreme ends bent upward.

[0052] The protrusions 71a, 71b are inserted between the protrusions 68a and 68b of the dam plate 68. The protrusions 71c, 71d are inserted between the protrusions 68b and 68c of the dam plate 68. With this configuration, the protrusions 71a to 71d suppress misalignment of the dam plate 68 in the left-right direction (vehicle width direction). The area between the right outer wall portion 65 and the dam frame 67 forms the rainwater channel portion 61d, and the area between the left outer wall portion 65 and the dam frame 67 forms the rainwater channel portion 61e. The central opening 63 is formed in an area surrounded by the rainwater channel portions 61a to 61e, and has a size comparable to the planar area of ​​the condenser 25.

[0053] The dam plate 68 has an opening 72 downstream of the rainwater channel section 61d, and an opening 73 downstream of the rainwater channel section 61e (see FIG. 6(a)). The openings 72, 73 allow the rainwater collected by the rainwater channel sections 61a, 61b, 61c to flow into the third rain gutter 80. The uppermost surfaces of the outer wall section 65, the dam frame 67, and the dam plate 68 abut against the upper inner surface 18a of the engine cover 18 (see FIG. 3).

[0054] Next, the flow of rainwater from the first rain gutter 50 and the second rain gutter 60 to the third rain gutter 80 will be described with reference to Fig. 4 and Fig. 6. The rainwater channel section 61a collects rainwater flowing out from the left side of the first rain gutter 50A-50D and rainwater entering from the intake opening 44b of the side surface section 43b, and directs it to the rear side. The rainwater channel section 61b collects rainwater flowing out from the right side of the first rain gutter 50A-50D and rainwater entering from the intake opening 44a of the side surface section 43a, and directs it to the rear side. The rainwater channel section 61c collects rainwater entering from the intake opening 44c of the side surface section 43c, and directs it to the rainwater channel sections 61a and 61b. The rainwater flow paths 61d and 61e collect the rainwater flowing from the rainwater flow paths 61a and 61b and the rainwater entering through the air intake opening 44d of the side surface portion 43d, and direct the collected rainwater to the third rain gutter 80.

[0055] FIG. 7 is a schematic diagram showing the flow of outside air and rainwater in the first rain gutter 50A and the second rain gutter 60. FIG. 7(a) is a cross-sectional view of the position indicated by the XX cutting line in FIG. 6(b), and FIG. 7(b) is an explanatory diagram showing the separation of rainwater and outside air between the second rain gutter 60 and the first rain gutter 50. FIG. 7(a) shows the flow of rainwater with a solid arrow and the flow of outside air with a dotted arrow. Note that FIG. 7(a) shows the left side of the second rain gutter 60. However, the first rain gutter 50 and the second rain gutter 60 are symmetrical with respect to the center line P in the left-right direction in a plan view, and the right side can be explained by replacing it with the left side, so illustration and explanation are omitted. Explanation will be made with reference to FIG. 4, FIG. 5, and FIG. 6. Note that the same reference numerals as those in FIG. 4, FIG. 5, and FIG. 6 are attached to each component shown in FIG. 7. Rainwater that has entered through the intake opening 36 of the intake cover 23 passes through the rainwater receiver 56 of the first rain gutter 50A and flows out into the rainwater flow path 61a of the second rain gutter 60. Outside air that has entered through the intake opening 36 of the intake cover 23 passes through the intake air flow path 55 of the first rain gutter 50A, passes over the inner wall 64 of the second rain gutter 60, passes through the intake air flow path 74 between the first rain gutter 50, and flows from the central opening 63 of the second rain gutter 60 to the condenser 25 side.

[0056] Rainwater that has infiltrated from the intake opening 44b of the side surface portion 43b flows through the rainwater channel portion 61a of the second rain gutter 60. At this time, the rainwater does not exceed the inner wall portion 64. On the other hand, rainwater that has infiltrated from the intake opening 44c of the side surface portion 43c flows through the rainwater channel portion 61c to the rainwater channel portion 61a and the rainwater channel portion 61b. In addition, outside air that has infiltrated from the intake opening 44b of the side surface portion 43b and the intake opening 44c of the side surface portion 43c passes through the rainwater channel portion 61a and the intake channel portion 74 at the top of the inner wall portion 64, and flows from the central opening 63 to the condenser 25 side.

[0057] Here, the condition for the second gutter 60 to effectively separate the invading rainwater from the outside air will be described with reference to FIG. 7(b). Here, the distance from the end of the first gutter 50 in the vehicle width direction to the inside wall portion 64 of the second gutter 60 (i.e., the crossing length of the first gutter 50 and the second gutter 60 at the end of the vehicle width direction) is L1, the distance from the bottom plate portion 51 of the first gutter 50 to the bottom plate portion 62 of the second gutter 60 is H1, and the height of the inside wall portion 64 is H2. In order to separate the invading rainwater between the first gutter 50 and the second gutter 60 from the outside air, it is preferable that the distance L1 is longer than the distance H1. Also, it is preferable that the height H2 of the inside wall portion 64 is high enough not to cause resistance to the outside air flowing through the intake passage portion 55. In addition, the distance L2 from the outer wall portion 65 of the second rain gutter 60 to the vehicle width direction end of the first rain gutter 50 (the distance within the range in the vehicle width direction where the second rain gutter 60 does not intersect with the first rain gutter 50) is large enough to accommodate rainwater flowing out from the first rain gutter 50 and rainwater entering through the intake opening 44b (see Figure 4).

[0058] Note that, although the above conditions are not limited to these, when the distance L1 becomes small, some of the rainwater may be sucked into the condenser 25 from the central opening 63 together with the outside air. When the distance L1 becomes too large, the space efficiency may decrease, or the fluid resistance due to pressure loss may increase. For this reason, it is desirable to determine the height H2 of the inner wall 64 and the distance L1 at which the first rain gutter 50 and the second rain gutter 60 intersect to be optimal values ​​that enable separation of the rainwater and the outside air within the above condition range, taking into account the sizes of the first rain gutter 50 and the second rain gutter 60, their relative positions, the expected amount of rainwater, the desired amount of outside air to be sucked in, and the like.

[0059] (Configuration of the third rain gutter 80) As shown in Fig. 3, a third rain gutter 80 is disposed below the rear side (rear door 19 side) end of the second rain gutter 60. The third rain gutter 80 is fixed to the inside of the upper edge of the rear door frame 27 that constitutes the rear door 19. The configuration of the third rain gutter 80 will be described with reference to Figs. 8 and 9.

[0060] FIG. 8 is a perspective view showing the relationship between the second rain gutter 60 and the third rain gutter 80. The same reference numerals as in FIG. 6 are used for the common parts, and the description will be made with reference to FIG. 3 as well. The lower surface (rear surface) of the bottom plate parts 62a, 62b of the second rain gutter 60 and the lower surface (rear surface) of the horizontal piece 70 of the dam plate 68 are at the same height and are configured to be in the same plane. The third rain gutter 80 has an L-shape, and the horizontal piece 81 extends so as to intersect at the end of the second rain gutter 60 on the rear door 19 side, specifically, below the end of the bottom plate parts 62a, 62b. The third rain gutter 80 is fixed at the vertical piece 82 to the inside of the upper edge of the rear door frame 27 (see FIG. 3). A packing 83 as a seal member is attached to the peripheral edge of the end of the horizontal piece 81 on the second rain gutter 60 side. A rainwater channel part 90 is configured in the area surrounded by the vertical piece 82, the horizontal piece 81, and the packing 83. When the rear door 19 is closed, the third rain gutter 80 comes into close contact with the lower surface 75 (see FIG. 3) of the second rain gutter 60 on the rear door 19 side via a packing 83. The third rain gutter 80 extends across approximately the width of the vehicle.

[0061] The rainwater channel section 90 of the third rain gutter 80 is surrounded by a horizontal piece 81, a vertical piece 82, and a packing 83. The rainwater channel section 90 extends to a range capable of receiving rainwater flowing out from the rainwater channel sections 61d, 61e of the second rain gutter 60. Since the right end of the third rain gutter 80 is closed by the packing 83, the rainwater is discharged from the rainwater outlet 89 on the left side to the outside of the engine compartment 20. In FIG. 8, the flow of rainwater is represented by solid arrows.

[0062] The right side end of packing 83 is a rising portion 84 that is attached to both the horizontal piece 81 and the vertical piece 82 of third rain gutter 80. The packing 83 is attached to the horizontal piece 81 in the range other than the rising portion 84. Next, the configuration of third rain gutter 80 will be described with reference to FIG.

[0063] FIG. 9 is a perspective view showing the configuration of the third rain gutter 80. FIG. 9(a) is a perspective view of the third rain gutter 80 seen from the right end, and FIG. 9(b) is a perspective view of the third rain gutter 80 seen from the left side. As shown in FIG. 9(a) and (b), the packing 83 is composed of a long side portion 85 attached over the entire length of the horizontal piece 81 of the third rain gutter 80, and a rising portion 84 attached to both the long side portion 85 and the vertical piece 82 at the right end. As shown in FIG. 9(a), the long side portion 85 is composed of a claw portion 86 for attaching the packing 83 so as to sandwich the horizontal piece 81, and a hollow abutment surface 87 that protrudes upward from the claw portion 86 and abuts against the lower surface 75 (see FIG. 3 and FIG. 6) of the second rain gutter 60.

[0064] As shown in FIG. 9(b), the raised portion 84 of the packing 83 has a claw portion 88 raised upward from the end portion extended to the right side of the long side portion 85. The claw portion 88 is configured so that the packing 83 can be attached so as to sandwich the vertical piece 82 of the third rain gutter 80. That is, the third rain gutter 80 has the packing 83 attached to the entire width at the right end of the horizontal piece 81. Therefore, the raised portion 84 acts as a rainwater stopper, and the rainwater is discharged only from the rainwater drainage port 89 on the left side. In addition, by providing the raised portion 84, it is possible to prevent the packing 83 from slipping out of the horizontal piece 81 or from being displaced. In FIG. 9, the solid arrows indicate the flow direction of the rainwater.

[0065] In the rainwater intrusion prevention structure 40 described above, the engine cover 18 has an inclined portion 21 whose height decreases from the cabin 15 side toward the rear door 19 side, and the intake cover 23 inclined along the inclined portion 21 is fixed to the engine cover 18. The intake cover 23 has an intake opening 36. The first rain gutter 50 is located below the intake opening 36 and extends horizontally in the vehicle width direction. The first rain gutter 50 receives rainwater that invades from the intake opening 36 in the rainwater receiving portion 56 and directs it to the second rain gutter 60. The first rain gutter 50 separates the outside air that invades together with the rainwater by the intake air flow passage portion 55 and directs it to the condenser 25 from the central opening 63.

[0066] The second rain gutter 60 is located below the first rain gutter 50, and extends from the cabin 15 side to the rear door 19 side along the inclined portion 21. The second rain gutter 60 receives rainwater flowing out from the end of the first rain gutter 50 in the vehicle width direction and rainwater entering from the intake cover 23 other than the first rain gutter 50 in rainwater flow path portions 61a to 61e, and directs it to the third rain gutter 80. In addition, the second rain gutter 60 separates the outside air that enters from the intake cover 23 together with the rainwater in the intake air flow path portion 74, and directs it from the central opening 63 to the condenser 25.

[0067] The third rain gutter 80 is disposed on the inside of the upper edge of the rear door 19, extends in the vehicle width direction (left-right direction), receives rainwater flowing out from the second rain gutter 60, and discharges it to the outside from the vehicle width end of the engine compartment 20.

[0068] In the rainwater intrusion prevention structure 40 of the present invention, the first rain gutter 50, the second rain gutter 60, and the third rain gutter 80, which have different flow path directions, are combined to disperse and drain the rainwater, making it possible to discharge the rainwater that invades the engine compartment 20 through the intake cover 23 outside the engine compartment 20.

[0069] The first rain gutter 50 separates the outside air that enters together with the rainwater by the intake air flow passage 55, sucks in the outside air by the suction force of the intake fan 26, and flows it from the central opening 63 of the second rain gutter 60 to the condenser 25. The second rain gutter 60 separates the outside air by the intake air flow passage 74, sucks in the outside air by the suction force of the intake fan 26, and flows it from the central opening 63 to the condenser 25. A space 34 is formed between the first rain gutter 50 and the condenser 25, and a wide space that does not hinder the flow of outside air is formed above the condenser 25, including the space 34 and the central opening 63. Therefore, it is possible to send sufficient outside air to the condenser 25, and the outside air can be sufficiently cooled by the condenser 25.

[0070] According to the rainwater intrusion prevention structure 40 described above, it is possible to enhance the effect of preventing rainwater from infiltrating from the intake cover 23 into the engine compartment 20, and also to enhance the cooling function of the condenser 25 for the sucked in outside air.

[0071] The intake cover 23 is provided on the top surface portion 42 and the side surfaces 43a to 43d. The rainwater receiving portion 56 of the first rain gutter 50 is larger than the intake opening 36 of the top surface portion 42, so that it is possible to receive all the rainwater entering through the intake opening 36. The first rain gutter 50 is disposed in the space 35 above the engine cover 18. The lower side of the first rain gutter 50 forms the central opening 63 of the second rain gutter 60. Therefore, since the distance between the first rain gutter 50 and the condenser 25 can be made large, it is possible to send sufficient outside air to the condenser 25, and it is possible to appropriately cool the outside air in the condenser 25.

[0072] In addition, the rainwater receiving portion 56 of the first rain gutter 50 is disposed directly below the intake opening 36 of the upper surface portion 42 of the intake cover 23, and has a larger area than the intake opening 36 in a plan view at a position facing the intake opening 36. Therefore, it is possible to receive rainwater entering through the intake opening 36 and drain it into the second rain gutter 60.

[0073] The intake cover 23 has intake openings 36 that are divided into multiple sections on the upper surface portion 42. The first rain gutters 50 are provided corresponding to each of the intake openings 36, and are arranged at predetermined intervals along the inclined portion 21 in order from the highest first rain gutter 50A to the lowest first rain gutter 50D. By configuring the first rain gutters 50 in multiple sections, rainwater can be divided and flowed to both ends of each gutter, which makes it possible to increase the drainage capacity of the rainwater.

[0074] Further, the rainwater receiving portion 56 of the first rain gutters 50A to 50D has a bottom plate portion 51 that is inclined along the inclined portion 21. The rainwater receiving portion 56 is composed of a rear wall portion 52 that extends from the end of the bottom plate portion 51 on the rear door 19 side and is connected to the intake cover 23, and a front wall portion 53 that extends from the end of the bottom plate portion 51 on the cabin 15 side and is connected to the intake cover 23. The front wall portion 53 has a weir portion 54 that is high enough that rainwater does not exceed it, and the gap between the weir portion 54 and the intake cover 23 is the intake air flow path portion 55, which allows outside air separated from rainwater to flow to the central opening 63. Since the first rain gutters 50A to 50D have both ends in the vehicle width direction open, rainwater entering from the intake cover 23 can be dispersed to both ends in the vehicle width direction and flow to the second rain gutters 60.

[0075] The rainwater flow paths 61a, 61b, and 61c of the second rain gutter 60 are formed by an inner wall 64 extending from the periphery of the central opening 63 toward the first rain gutter 50, and have a predetermined flow path width from the inner wall 64. The rainwater flow paths 61d and 61e are formed by the inner wall 64 and a weir frame 67. These rainwater flow paths 61a to 61e receive all the rainwater that enters from the intake openings 36, 44a to 44d of the intake cover 23 and allow it to flow to the third rain gutter 80. The height of the inner wall 64 is lower than the height of the outer wall 65, and the gap between the inner wall 64 and the first rain gutter 50 separates the rainwater from the outside air and forms an intake air flow path 74 that allows only the outside air to flow, and allows it to be sent to the central opening 63.

[0076] Further, the distance L1 from the end of the first rain gutter 50 in the vehicle width direction to the inner wall portion 64 of the second rain gutter 60 is longer than the distance H1 from the bottom plate portion 51 of the first rain gutter 50 to the bottom plate portion 62 of the second rain gutter 60. Further, the height H2 of the inner wall portion 64 is set to a height that does not cause resistance to the outside air flowing through the intake air flow passage portion 55. By doing so, it is possible to separate the rainwater and the outside air, and it is possible to prevent some of the rainwater from flowing from the central opening 63 through the intake air flow passage portion 55 to the condenser 25. By setting such conditions, it is possible to improve the cooling effect of the condenser 25 by good separation of the rainwater and the outside air.

[0077] The third rain gutter 80 has an L-shaped cross section, a gasket 83 is attached to a horizontal piece 81 of the L shape, and a rainwater channel section 90 is formed in the area surrounded by the horizontal piece 81, the vertical piece 82, and the gasket 83. When the rear door 19 is closed, the rainwater channel section 90 crosses the lower side of the second rain gutter 60 and is capable of receiving rainwater flowing out from the second rain gutter 60. Moreover, one end of the rainwater channel section 90 in the vehicle width direction is closed by the gasket 83, so that rainwater can be discharged to the outside of the engine compartment 20 from a rainwater outlet 89 provided on the other side.

[0078] The work vehicle 1 is composed of a vehicle body 10, a pair of left and right running gear 12 arranged below both ends of the vehicle width direction of the vehicle body 10, a main body frame 13 to which the running gear 12 are attached, a work gear 14 attached to the main body frame 13, a cabin 15 arranged in the upper center of the main body frame 13, and a structure 40 for preventing rainwater from entering the engine compartment 20.

[0079] The work vehicle 1 configured in this manner has the rainwater intrusion prevention structure 40 described above, which enhances the effect of preventing rainwater from infiltrating from the intake cover 23 into the engine compartment 20, and also enhances the cooling function of the outside air sucked in by the condenser 25.

[0080] The present invention is not limited to the above-described embodiment, and modifications and improvements within the scope of the present invention are included in the present invention. For example, in the above-described embodiment, the first rain gutters 50A-50D are arranged horizontally in the vehicle width direction, and rainwater is discharged from both ends in the vehicle width direction to the second rain gutter 60. However, the first rain gutters 50A-50 may be inclined in the length direction, and rainwater may be discharged from one end in the vehicle width direction to the second rain gutter 60.

[0081] In the embodiment described above, the third rain gutter 80 has a closed end on the right side in the vehicle width direction, and rainwater is discharged from the end through the rainwater drain outlet 89 on the left side. However, the left end may be closed, and the rainwater drain outlet 89 may be provided on the right side. Alternatively, the rainwater drain outlet 89 may be provided on both the left and right ends. [Explanation of symbols]

[0082] 1...work vehicle, 10...body, 12...traveling gear, 13...main body frame, 14...working gear, 15...cabin, 18...engine cover, 19...rear door, 20...engine room, 21...inclined portion, 22...engine cover opening, 23...intake cover, 25...condenser, 35...space portion, 36, 44a to 44d...intake opening, 38, 45, 46...intake plate, 39...through hole, 40...rainwater intrusion prevention mechanism (mechanism for preventing rainwater intrusion into engine room), 41...bottom surface portion, 42...upper surface portion, 43a to 43d...side portion, 50, 50A, 50B, 50C, 50D...first rain gutter, 51, 62, 62a, 62b... bottom plate portion, 52... rear plate portion, 53... front wall portion, 54... dam portion, 55, 74... intake flow path portion, 56... rainwater receiving portion, 60... second rain gutter, 61, 61a, 61b, 61c, 61d, 61e, 90... rainwater flow path portion, 63... central opening, 64... inner wall portion, 65... outer wall portion, 68... dam plate, 69... vertical piece of dam plate, 70... horizontal piece of dam plate, 72, 73... opening of dam plate, 80... third rain gutter, 81... horizontal piece of third rain gutter, 82... vertical piece of third rain gutter, 83... packing (sealing member), 89... rainwater outlet, EG... engine, H1, L1, L2... distance, H2... height

Claims

1. an intake cover that is disposed in an upper portion of the engine compartment, is disposed so as to cover an opening provided in the engine cover having a sloped portion whose height decreases from the cabin side to the rear door side, has an intake opening, and is fixed to the engine cover along the sloped portion; a first gutter located below the intake opening, extending horizontally in the vehicle width direction, and including a rainwater receiving portion for receiving rainwater entering through the intake opening, and an intake air flow path for separating outside air entering together with the rainwater and flowing the separated outside air toward the engine compartment; a second rain gutter located below the first rain gutter, extending from the cabin side to the rear door side along the inclined portion, the second rain gutter having a rainwater flow path portion that receives rainwater flowing out from an end portion of the first rain gutter in the vehicle width direction and flows it toward the rear door side, an air intake flow path portion that separates outside air that enters together with the rainwater and flows it toward the engine compartment, and a central opening portion that faces a condenser; a third rain gutter that is disposed inside an upper edge of the rear door, extends in the vehicle width direction, receives rainwater flowing out of the second rain gutter, and discharges the rainwater to the outside of the engine compartment; It has A structure for preventing rainwater from entering an engine compartment.

2. 2. The structure for preventing rainwater from entering an engine compartment according to claim 1, the intake cover is composed of an open bottom surface portion, a top surface portion having an area smaller than that of the bottom surface portion, and a side surface portion connecting the bottom surface portion and the top surface portion, and has a space portion surrounded by the top surface portion and the side surface portion, The intake opening is provided in each of the top surface portion and the side surface portion, The first gutter is disposed inside the space, The rainwater receiving portion is disposed directly below the intake opening provided on the upper surface portion, and has an area larger than at least the intake opening in a plan view at a position facing the intake opening. A structure for preventing rainwater from entering an engine compartment.

3. 2. The structure for preventing rainwater from entering an engine compartment according to claim 1, The first rain gutters are provided corresponding to each of the plurality of air intake openings defined on the upper surface portion of the air intake cover, and are arranged in parallel with each other at a predetermined interval along the inclined portion. A structure for preventing rainwater from entering an engine compartment.

4. 2. The structure for preventing rainwater from entering an engine compartment according to claim 1, the first rain gutter has a bottom plate portion inclined along the inclined portion, a rear wall portion extending from an end portion of the bottom plate portion on a rear door side and connected to the intake cover, and a front wall portion extending from an end portion of the bottom plate portion on a cabin side and connected to the intake cover, The front wall portion has a dam portion having a height that is not exceeded by rainwater of an estimated rainfall amount, and the intake air flow path portion is configured between the dam portion and the intake cover, The end of the first gutter in the vehicle width direction is open. A structure for preventing rainwater from entering an engine compartment.

5. 2. The structure for preventing rainwater from entering an engine compartment according to claim 1, The rainwater flow path portion of the second rain gutter is composed of a bottom plate portion, an inner wall portion extending from a peripheral portion of the central opening of the bottom plate portion toward the first rain gutter, and an outer wall portion extending from the inner wall portion toward the first rain gutter side with a predetermined flow path width, The height of the inner wall portion from the bottom plate portion is a height that is not exceeded by rainwater of an estimated rainfall amount and is lower than the height of the outer wall portion, and an intake air flow path portion is formed between the inner wall portion and the first rain gutter, A dam plate having an L-shaped cross section is disposed at an end of the second rain gutter on a rear door side, the dam plate extending across the second rain gutter in the vehicle width direction, The L-shaped vertical piece of the dam plate has an opening for allowing rainwater from the rainwater flow channel portion to flow into the third rain gutter, and the horizontal piece extends so as to intersect above the third rain gutter. A structure for preventing rainwater from entering an engine compartment.

6. The structure for preventing rainwater from entering an engine compartment according to claim 5, A distance from an end of the first rain gutter in the vehicle width direction to the inner wall portion of the second rain gutter is longer than a distance from the bottom plate portion of the first rain gutter to the bottom plate portion of the second rain gutter, The height of the inner wall portion is set to a level that does not create resistance to outside air flowing through the intake air flow path portion. A structure for preventing rainwater from entering an engine compartment.

7. 2. The structure for preventing rainwater from entering an engine compartment according to claim 1, the third gutter has an L-shaped cross section, extends across the vehicle width, has a vertical piece of the L-shape fixed to an inside of an upper edge of the rear door, and has a horizontal piece extending to a position capable of intersecting with an end of the second gutter on the rear door side; A seal member is attached to the peripheral edge of the end of the horizontal piece on the second gutter side, A rainwater flow path is formed in an area surrounded by the vertical piece, the horizontal piece, and the sealing member, At least one of the vehicle width direction ends of the rainwater channel portion is closed. A structure for preventing rainwater from entering an engine compartment.

8. The car body and A pair of left and right traveling devices arranged below both ends in a vehicle width direction with respect to the vehicle body; A main body frame to which the traveling device is attached; A working device attached to the main body frame; A cabin disposed at a central upper portion of the main body frame; The structure for preventing rainwater from entering an engine compartment according to any one of claims 1 to 7, A work vehicle characterized by:

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