Sediment intrusion prevention structure

Abstract

To provide a sediment intrusion prevention structure which can prevent intrusion of sediment from a gap between the upper surface of a bumper and the lower part of a rear door.SOLUTION: A sediment intrusion prevention structure 40 includes an openable / closable rear door 19, a bumper 30 arranged so as to overhang to a lower rear side from the rear door 19 when the rear door 19 is closed, a sediment intrusion prevention wall member 60 which is extended to be longer than an opening range of an opening 27 between rear end wall parts 13a and 13b of a body frame 13 arranged on both right and left sides of a vehicle body 10, and is fixed to an upper surface 30a of the bumper 30, and a flexible trim 50 which is mounted on a trim mounting plate 57 arranged on an inner lower side of a peripheral edge part 26a of a rear door frame 26 constituting the rear door 19, and has such a plane shape as to follow a plane shape of the sediment intrusion prevention wall member 60, wherein the trim 50 is configured so as to be brought into contact with the full length of the sediment intrusion prevention wall member 60, when the rear door 19 is closed.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a structure for preventing the intrusion of soil and sand. [Background technology]

[0002] As a work vehicle, for example, a crawler-type skid steer loader or a hydraulic excavator, which is used for excavating the ground or moving excavated soil and sand, is widely known. Such work vehicles often work while kicking up foreign objects such as soil and vegetation. Therefore, if there is an opening in the outer shell of the vehicle, there is a risk that foreign objects may enter the vehicle through the opening and accumulate inside the vehicle, preventing the vehicle from functioning as a work vehicle. In addition, in order to remove the accumulated foreign objects, it is necessary to perform work such as removing parts that are obstructing the work, and the work must be interrupted.

[0003] One example of a work vehicle is a work vehicle in which an arm attachment part called an arm post having an internal space at the rear is formed. The base ends of an arm and a hydraulic cylinder are rotatably fixed in the internal space of the arm post. The arm post is formed with an opening into which the base ends of the arm and hydraulic cylinder are inserted. This opening is formed so as not to interfere with the operation of the arm and hydraulic cylinder, and is opened relatively large. Foreign matter such as soil and sand easily enters and accumulates in this opening during work. Therefore, a work vehicle has been disclosed in which a cleaning opening is formed on the rear end surface of the arm post to remove foreign matter such as soil and sand that has entered the internal space (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-89364 A Summary of the Invention [Problem to be solved by the invention]

[0005] The work vehicle of the above-mentioned Patent Document 1 has two cleaning openings on the left and right sides of the rear end surface of the arm post. The cleaning openings are arranged in positions that allow removal of foreign objects that have entered the internal space of the arm post. During work, one of the two cleaning openings is closed by the rear door, and the other is covered by a cover plate, so that foreign objects cannot enter through the cleaning opening.

[0006] In a work vehicle, the rear door is structured to be openable and closable, so a gap is provided between the rear door and the bumper to prevent them from interfering with each other. Foreign objects such as sand and dirt may enter the engine compartment through the gap between the bumper and the rear door, which is located closer to the ground than the opening of the arm post. However, the work vehicle of the above-mentioned Patent Document 1 is not provided with a means for preventing foreign objects from entering the gap between the bumper and the rear door. Therefore, there is a problem that foreign objects such as sand and dirt may enter the engine compartment through the gap between the bumper and the rear door and accumulate therein. These foreign objects such as sand and dirt accumulate between the equipment such as the engine and the radiator and the body frame at the bottom of the vehicle, and therefore cannot be easily removed.

[0007] Therefore, the present invention has been made to solve such problems, and aims to realize a soil and sand intrusion prevention structure that can prevent soil and sand from entering through the gap between the top surface of the bumper and the bottom of the rear door. [Means for solving the problem]

[0008] [1] The soil / sand intrusion prevention structure of the present invention comprises a rear door that can be opened and closed freely, a bumper that is arranged to protrude downward and rearward from the rear door when the rear door is closed, a soil / sand intrusion prevention wall member that extends longer than the opening range of an opening between the rear end wall portions of a main body frame arranged on both the left and right sides of the vehicle body and is fixed to an upper surface of the bumper, and a flexible trim that is attached to a trim mounting plate that is arranged inside and below the peripheral portion of the rear door frame that constitutes the rear door and has a planar shape that follows the planar shape of the soil / sand intrusion prevention wall member, and is configured so that the trim can abut over the entire length of the soil / sand intrusion prevention wall member when the rear door is closed.

[0009] The term "soil" as used here includes sand, gravel, dusty sand, vegetation, etc., and is collectively referred to as soil.

[0010] [2] In the soil / sand intrusion prevention structure of the present invention, the soil / sand intrusion prevention wall member is formed from round steel and has a planar shape that is spaced rearward from the rear end wall portion and is formed of a central extension portion that extends along the rear end wall portion and a tip extension portion that extends from both ends of the central extension portion to a position reaching the rear end wall portion, and it is preferable that the angle formed by the central extension portion and the extension portion is an obtuse angle and that the central extension portion and the tip extension portion are connected by a circular arc.

[0011] [3] In the soil / sand intrusion prevention structure of the present invention, it is preferable that the trim is composed of a U-shaped trim mounting plate insertion portion that is open on the side where the trim mounting plate is inserted, and a hollow sealing portion that is positioned so as to abut against the soil / sand intrusion prevention wall member.

[0012] [4] In the soil / sand intrusion prevention structure of the present invention, it is preferable that the sealing portion is positioned and shaped so that it can abut against the top of the soil / sand intrusion prevention wall member from its rear surface when the rear door is closed. Effect of the Invention

[0013] The above-described soil intrusion prevention structure includes a flexible trim disposed below the rear door and a soil intrusion prevention wall member fixed to the upper surface of the bumper. The soil intrusion prevention wall member extends so as to cover the opening between the left and right rear end walls of the vehicle body in a plan view. The trim has a shape that conforms to the planar shape of the soil intrusion prevention wall member. When the rear door is closed, the trim abuts against the soil intrusion prevention wall member over its entire length. This structure makes it possible for the soil intrusion prevention structure to prevent soil and sand from entering through the gap between the bottom of the rear door and the upper surface of the bumper. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing an overview of one configuration 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 rear door 19 is open. [Diagram 3] 2 is an explanatory diagram showing a schematic planar shape of a soil intrusion prevention wall member 60 fixed to a bumper 30. FIG. [Figure 4] FIG. 2 is a perspective view of a rear door 19 to which a trim 50 is attached, as viewed from the inside (vehicle body side). [Diagram 5] FIG. 2 is an explanatory diagram showing the configuration of a trim 50. [Figure 6] FIG. 2 is an explanatory diagram showing a schematic diagram of a state in which a rear door 19 is closed. [Figure 7] 1 is an explanatory diagram showing a typical intersecting relationship between a trim 50 and a soil / sand intrusion prevention wall member 60. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a "soil intrusion prevention structure 40" according to an embodiment of the present invention will be described with reference to the drawings.

[0016] (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, arrows indicate the direction of each part relative to a vehicle body 10. That is, in Fig. 1, the forward direction of the work vehicle 1 is the front, the backward direction is the rear, the right side as viewed in the forward direction is the right side, and the left side is the left side.

[0017] The work vehicle 1 has a pair of left and right traveling devices 12, 12 formed by crawlers 11, located below both sides in the vehicle width direction with respect to a vehicle body 10. The traveling devices 12, 12 are attached to main body frames 13 that are arranged on both the left and right sides of the vehicle body 10. A working device 14 is attached to the front side of the main body frame 13, and a cabin 15 is arranged in the upper center of the vehicle body 10.

[0018] 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 has a working tool such as a bucket attached to the front end of the arm 16 via a bracket.

[0019] The work vehicle 1 also has an engine compartment 20 (see FIG. 6) which is a space surrounded by a 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. An engine (not shown) and other components are disposed inside the engine compartment 20.

[0020] 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 relative to the body frame 13 by an engine cover lock mechanism 24 during normal operation. The engine cover 18 is also configured so that it can be opened upward during maintenance and the like. On the other hand, the rear door 19 can be opened to the left when viewed from the right side in a plan view, with hinge mechanisms 31A, 31B (see FIG. 2) provided between the body frame 13 on the left side and the rear door frame 26 as a fulcrum.

[0021] The rear door 19 is normally held in a closed state by a rear door lock lever 25 (see FIG. 2), and can be put in an open state by pulling up the rear door lock lever 25.

[0022] The vehicle body 10 has a bumper 30 that is disposed to protrude downward and rearward from the rear door 19 when the rear door 19 is closed. A gap D1 is provided between the lowermost portion 19a of the rear door 19 and an upper surface 30a of the bumper 30 so that the rear door 19 can be opened and closed freely without interfering with the bumper 30. There is a risk that soil and sand will enter the engine compartment 20 (see FIG. 6) during work from the gap D1 located close to the ground. Therefore, the work vehicle 1 is provided with a soil and sand intrusion prevention structure 40 (see FIG. 6) that prevents soil and sand from entering the gap D1 between the rear door 19 and the bumper 30. Note that soil and sand here collectively refers to foreign matter including sand, pebbles, gravel, dusty sand, vegetation, and the like. The soil and sand intrusion prevention structure 40 will be described with reference to FIG. 2 and subsequent figures.

[0023] Fig. 2 is a perspective view showing the rear door 19 in an open state. Since the configuration of the work vehicle 1 is the same as that shown in Fig. 1, the same components are given the same reference numerals as in Fig. 1. When the rear door 19 is opened by pulling up the rear door lock lever 25, a radiator 45 appears in front of the rear side of the vehicle body 10.

[0024] Hinge mechanisms 32A, 32B are provided at two upper and lower positions on the left side of the main body frame 13 and the radiator frame 46. The right side of the radiator 45 is supported so as to be openable and closable in the left-right direction in a plan view, with the hinge mechanisms 32A, 32B as fulcrums. Therefore, in order to allow the radiator 45 to be opened and closed freely without interfering with the bumper 30, a gap D2 (see FIG. 6 for details) is formed in the vertical direction between the bottommost part 46a of the radiator frame 46 and the upper surface 30a of the bumper 30.

[0025] A dirt intrusion prevention wall member 60, which is one of the dirt intrusion prevention structures 40, is fixed to the upper surface 30a of the bumper 30. The dirt intrusion prevention wall member 60 is formed of a steel round bar (referred to as round steel) with a circular cross section. At the rear side of the vehicle body 10, an opening 27 for enabling the radiator 45 to be opened and closed is provided between the right rear end wall portion 13a and the left rear end wall portion 13b of the main body frame 13. The configuration of the dirt intrusion prevention wall member 60 will be described with reference to FIG. 3.

[0026] The rear door 19 is configured with a rear door frame 26 having a concave structure on the surface facing the radiator 45. A trim 50, which configures the other half of the soil intrusion prevention structure 40, is disposed on the inner lower side of the peripheral portion 26a of the rear door frame 26. The trim 50 moves integrally with the rear door 19 in accordance with the movement of the rear door 19. The configuration of the trim 50 will be described with reference to Figs. 4 and 5.

[0027] FIG. 3 is an explanatory diagram showing a planar shape of the soil intrusion prevention wall member 60 fixed to the bumper 30. In FIG. 3, the engine cover 18, the rear door 19, and the like are omitted. The planar shape of the soil intrusion prevention wall member 60 has a central extension portion 60a that is spaced rearward from an extension line of the right rear end wall portion 13a and the left rear end wall portion 13b of the main body frame 13 and extends along the rear end walls 13a and 13b. The soil intrusion prevention wall member 60 is formed by tip side extension portions 60b and 60c that extend from both ends of the central extension portion 60a to positions that reach the rear end walls 13a and 13b. That is, the soil intrusion prevention wall member 60 is arranged so as to cover the opening range of the opening 27 between the rear end wall portion 13a and the rear end wall portion 13b in a plan view.

[0028] The soil intrusion prevention wall member 60 has a circular cross-sectional shape, and the angle θ between the central extension 60a and the tip side extensions 60b, 60c is bent at an obtuse angle. The central extension 60a and the tip side extensions 60b, 60c are smoothly rounded and connected to each other by a circular arc r. By forming the soil intrusion prevention wall member 60 in this shape, the soil intrusion prevention wall member 60 can maintain a smooth front and back surfaces without unevenness such as wrinkles and cracks that tend to occur during bending. The trim 50 described later can be made to abut evenly over the entire length of the soil intrusion prevention wall member 60. In this embodiment, the soil intrusion prevention wall member 60 is composed of the central extension 60a and the tip side extensions 60b, 60c, but it is also possible to form the central extension 60a and the tip side extensions 60b, 60c into a gently continuous curved shape.

[0029] The cross-sectional shape of the soil intrusion prevention wall member 60 does not necessarily have to be a perfect circle, and an ellipse or a polygon with no corners can also be used. Furthermore, if the soil intrusion prevention wall member 60 is fixed by welding at the contact points with the bumper 30, there is no lift-up and sufficient fixing strength can be obtained. The bumper 30 is an extension of the lower body frame 28 (see FIG. 6) disposed below the vehicle body 10.

[0030] FIG. 4 is a perspective view of the rear door 19 to which the trim 50 is attached, as viewed from the inside (vehicle body side). The rear door frame 26 has a concave shape surrounded by a peripheral edge 26a. When the rear door 19 is closed, the peripheral edge 26a faces the rear end walls 13a, 13b (see FIG. 2) of the main body frame 13 with a predetermined distance therebetween. The rear door 19 has hinge mechanisms 31A, 31B at the end on the left side, and is attached to the vehicle body 10 by the hinge mechanisms 31A, 31B so as to be openable and closable. A plurality of louvers 42 are fitted into the center of the rear door frame 26. The spaces between adjacent louvers 42 are defined by the engine compartment 20 (see FIG. 6). Exhaust outside air from It is now possible to open up new possibilities.

[0031] A rear door lock lever 25 is disposed on the right side of the rear door 19. In addition, a stopper 43 is attached to the lower right side of the rear door frame 26 in order to absorb the shock generated when the rear door 19 is closed and to maintain an appropriate distance between the rear end walls 13a, 13b of the main body frame 13 and the peripheral edge 26a.

[0032] The trim 50 is attached to the inner lower side of the left and right peripheral edges 26a of the rear door frame 26, at the ends of a trim mounting plate 57 that protrudes toward the vehicle body 10 (see FIG. 2). A trim slip-off prevention member 58 is attached to the trim mounting plate 57 to prevent the trim 50 from slipping off when the rear door 19 is opened or closed. Although three trim slip-off prevention members 58 are used in FIG. 4, the number can be increased or decreased to, for example, two or four. Next, the configuration of the trim 50 will be described.

[0033] FIG. 5 is an explanatory diagram showing the configuration of the trim 50. FIG. 5(a) is a plan view showing the state in which the trim 50 is attached to the trim mounting plate 57, FIG. 5(b) is a cross-sectional view showing the state in which the trim 50 is attached to the trim mounting plate 57, and FIG. 5(c) is a cross-sectional view showing the cross-sectional configuration of the trim 50. Note that each diagram in FIG. 5 is a schematic diagram with a different scale and aspect ratio. First, the state in which the trim 50 is attached to the trim mounting plate 57 will be described with reference to FIG. 5(a). Note that FIG. 5(a) shows the state as viewed from part A in FIG. 5(b).

[0034] As shown in Figures 5(a) and 5(b), the trim mounting plate 57 is fixed horizontally to the inner side surface 26b by welding or the like, on the inside lower side of the peripheral portion 26a of the rear door frame 26. The trim mounting plate 57 has a side surface 57a on the opposite side to the rear door frame 26 as a trim mounting portion 57b having a planar shape conforming to the shape of the soil intrusion prevention wall member 60. The trim 50 is mounted to this trim mounting portion 57b conforming to the shape of the side surface 57a. Therefore, the trim 50 has a planar shape conforming to the shape of the soil intrusion prevention wall member 60, and can be abutted against the soil intrusion prevention wall member 60 over the entire length.

[0035] Since the trim 50 is flexible, it may be formed into a linearly expanded shape and attached to the trim mounting portion 57b. Alternatively, the trim 50 may be formed in advance into a shape that follows the shape of the trim mounting portion 57b. As shown in FIG. 5(b), the trim 50 is composed of a trim mounting plate insertion portion 51 and a seal portion 54. The seal portion 54 is a portion that comes into contact with the soil intrusion prevention wall member 60 when the rear door 19 is closed. The trim mounting plate insertion portion 51 and the seal portion 54 are formed over the entire length of the soil intrusion prevention wall member 60.

[0036] A trim coming-off prevention member 58 is fixed to the trim mounting plate 57. As shown in FIG. 5(b), the trim coming-off prevention member 58 is composed of a main body portion 58a which is welded and fixed to the trim mounting plate 57, and a trim position restriction portion 58b which extends from the main body portion 58a and restricts the movement of the trim 50 forward. The trim position restriction portion 58b hangs down from the main body portion 58a to near the center of the cross section of the trim mounting plate insertion portion 51 of the trim 50. The trim coming-off prevention member 58 can be configured to be detachably attached to the trim mounting plate 57 by bolts and nuts. This configuration makes it possible to easily mount the trim 50 on the trim mounting plate 57. Next, the cross-sectional configuration of the trim 50 will be described in more detail.

[0037] As shown in FIG. 5(c), the trim 50 is composed of a U-shaped trim mounting plate inserting portion 51 that opens on the side where the trim mounting plate 57 is inserted, and a hollow seal portion 54 that can abut against the soil intrusion prevention wall member 60. The trim mounting plate inserting portion 51 has protrusions 52a and 52b on one straight portion 52 that constitutes the U-shape, and has protrusions 53a and 53b on the other straight portion 53. The distance between the tips of the protrusions 52a and 52b and the protrusions 53a and 53b is smaller than the thickness of the trim mounting plate 57. The protrusions 52a, 52b, 53a, and 53b are each inclined in a direction that makes it easier to insert the trim mounting plate 57. Therefore, the trim mounting plate inserting portion 51 has a shape that makes it easier to insert the trim mounting plate 57 and makes it difficult for the trim mounting plate 57 to come off. In FIG. 5(c), the state in which the trim 50 is attached to the trim attachment plate 57 is shown by a two-dot chain line.

[0038] The trim 50 is made of a flexible material. A reinforcing metal plate 55 is inserted into the U-shaped portion of the trim mounting plate insertion portion 51 as a core material. The core material may be a two-layer or three-layer molded material with a hard resin, and the reinforcing metal plate 55 may not be used in some cases.

[0039] Below the straight portion 53 of the trim mounting plate insertion portion 51, a seal portion 54 is formed integrally with the trim mounting plate insertion portion 51. The seal portion 54 is composed of a ring portion 54a. The ring portion 54a is flexible and is configured so that when it comes into contact with the soil intrusion prevention wall member 60, the portion that intersects with the soil intrusion prevention wall member 60 deforms. The soil intrusion prevention structure 40 is configured by the trim 50 and the soil intrusion prevention wall member 60 described above.

[0040] (Soil and sand intrusion prevention structure 40) 6 is an explanatory diagram showing a schematic diagram of a state in which the rear door 19 is closed. A gap D1 is formed between the bottommost portion 19a of the rear door 19 and the upper surface 30a of the bumper 30. Without the soil intrusion prevention structure 40, soil would enter the inside of the engine compartment 20 through the gap D1 and accumulate there, as shown by the thick arrow. However, the soil intrusion prevention structure 40, which is composed of the trim 50 and the soil intrusion prevention wall member 60, closes the gap D1. Therefore, soil that attempts to enter from the outside is blocked by the soil intrusion prevention structure 40, making it possible to prevent soil from entering the inside of the engine compartment 20.

[0041] The rear door 19 is structured to open and close by rotating around hinge mechanisms 31A, 31B (see FIG. 2). Therefore, by providing the soil / sand intrusion prevention structure 40, it is required that the rear door 19 can be opened and closed smoothly when closing the gap D1 and when opening the rear door 19, and that the trim 50 is not damaged. Here, a situation in which the trim 50 and the soil / sand intrusion prevention wall member 60 come into contact with or separate from each other will be described.

[0042] FIG. 7 is an explanatory diagram showing a schematic crossing relationship between the trim 50 and the soil intrusion prevention wall member 60. FIG. 7(a) shows a state in which the rear door 19 is open. The trim 50 is not in contact with the soil intrusion prevention wall member 60. In this state, the work vehicle 1 is not performing work. FIG. 7(b) shows a state in which the trim 50 abuts (crosses) the soil intrusion prevention wall member 60. When the seal portion 54 of the trim 50 abuts against and crosses the soil intrusion prevention wall member 60, the ring portion 54a is deformed by the amount of crossing. The trim 50 presses the soil intrusion prevention wall member 60 according to the amount of deformation of the ring portion 54a. However, the pressing force of the seal portion 54 at this time is small and does not affect the opening and closing of the rear door 19.

[0043] FIG. 7(c) shows the state when the rear door 19 is fully closed. The seal portion 54 of the trim 50 intersects the soil intrusion prevention wall member 60 more deeply than in the state shown in FIG. 7(b). The ring portion 54a is deformed more than in the state shown in FIG. 7(b). Therefore, the pressing force that the ring portion 54a exerts on the soil intrusion prevention wall member 60 is also increased. However, since this pressing force is due to the deformation of the ring portion 54a, it does not greatly affect the opening and closing of the rear door 19. In addition, the range in which the seal portion 54 (ring portion 54a) contacts the soil intrusion prevention wall member 60 is the upper surface on the rear side from the top P of the soil intrusion prevention wall member 60. Therefore, when the rear door 19 is opened, the trim 50 is not damaged by the seal portion 54 getting caught on the front side (vehicle body 10 side) of the soil intrusion prevention wall member 60.

[0044] As described above, the soil intrusion prevention structure 40 has the flexible trim 50 disposed below the rear door 19 and the soil intrusion prevention wall member 60 fixed to the upper surface 30a of the bumper 30. The soil intrusion prevention wall member 60 extends so as to cover the opening 27 between the left and right rear end wall portions 13a, 13b of the vehicle body 10 in a plan view. The trim 50 has a shape following the planar shape of the soil intrusion prevention wall member 60. When the rear door 19 is closed, the trim 50 abuts against the soil intrusion prevention wall member 60 over the entire length. With this structure, the soil intrusion prevention structure 40 can prevent soil from intruding through the gap D1 between the lowermost portion 19a of the rear door 19 and the upper surface 30a of the bumper 30.

[0045] The soil intrusion prevention wall member 60 is formed of a central extension 60a and tip extensions 60b, 60c that extend from both ends of the central extension 60a to positions that reach the rear end wall portions 13a, 13b, respectively. The angle θ formed by the central extension 60a and the tip extensions 60b, 60c is an obtuse angle, and the central extension 60a and the tip extensions 60b, 60c are connected by a circular arc r.

[0046] By forming the soil intrusion prevention wall member 60 in such a shape, the soil intrusion prevention wall member 60 can maintain smooth front and back surfaces without unevenness such as wrinkles and cracks that tend to occur during bending. When the rear door 19 is closed, the trim 50 can be brought into uniform contact with the soil intrusion prevention wall member 60 over the entire length. It is also possible to prevent the trim 50 from being damaged by repeated opening and closing of the rear door 19. When performing maintenance, a worker may place his / her hands, legs, or soles on the soil intrusion prevention wall member 60. However, since the cross-sectional shape of the soil intrusion prevention wall member 60 is circular, there is no risk of the worker getting his / her hands or legs caught in the soil intrusion prevention wall member 60 or injuring his / her hands, legs, or soles.

[0047] The trim 50 is composed of a U-shaped trim mounting plate insertion portion 51 that is open on the side where the trim mounting plate 57 is inserted, and a hollow seal portion 54 that is disposed at a position where it can come into contact with the soil intrusion prevention wall member 60. The trim mounting plate insertion portion 51 has inwardly facing protrusions 52a, 52b, 53a, and 53b, making it easy to mount the trim mounting plate 57 and difficult to remove. The seal portion 54 is flexible and composed of a hollow ring portion 54a, so that excessive load is not generated when the rear door 19 is opened and closed, and durability can be improved.

[0048] In the trim 50, the seal portion 54 is configured in a position and shape such that it can abut from the top P of the soil / sand intrusion prevention wall member 60 to the surface on the rear side (rear door 19) when the rear door 19 is closed. In other words, the seal portion 54 is configured so that no pressure is applied at the position where it climbs over the top P of the soil / sand intrusion prevention wall member 60. Therefore, when the rear door 19 is opened, no large load is applied to the seal portion 54 that would pull the trim 50 out of the trim mounting plate 57, so that damage to the trim 50 can be prevented.

[0049] The soil intrusion prevention structure 40 also has a trim coming-off prevention member 58. Since the trim 50 is mounted by inserting the trim mounting plate insertion portion 51 into the trim mounting plate 57, the provision of the trim coming-off prevention member 58 makes it possible to stably maintain the mounted position. In particular, it is possible to prevent the trim 50 from falling off the trim mounting plate 57 or from becoming deformed when the rear door 19 is opened. [Explanation of symbols]

[0050] 1...work vehicle, 11...crawler, 12...traveling device, 13...main body frame, 13a, 13b...rear end wall portion, 19...rear door, 26...rear door frame, 26a...periphery, 27...opening, 30...bumper, 30a...upper surface, 40...earth and sand intrusion prevention structure, 50...trim, 51...trim mounting plate insertion portion, 54...seal portion, 57...trim mounting plate, 58...trim removal prevention member, 58a...main body portion of trim removal prevention member, 58b...trim position restriction portion, 60...earth and sand intrusion prevention wall member, 60a...central extension portion, 60b, 60c...tip side extension portion

Claims

1. The rear door can be opened and closed freely, a bumper disposed to protrude rearward and below the rear door when the rear door is closed; a soil intrusion prevention wall member that extends beyond the opening range of an opening between rear end wall portions of a main body frame disposed on both the left and right sides of a vehicle body and is fixed to an upper surface of the bumper; a trim mounting plate disposed on an inner lower portion of a peripheral portion of a rear door frame constituting the rear door, the trim being flexible and having a planar shape conforming to the planar shape of the soil intrusion prevention wall member; The trim is configured to be able to come into contact with the soil / sand intrusion prevention wall member over the entire length when the rear door is closed. A structure for preventing soil and sand from entering.

2. The structure for preventing soil and sand intrusion according to claim 1, The soil intrusion prevention wall member is formed of round steel, and has a planar shape that is spaced rearward from the rear end wall portion and is formed of a central extension portion that extends along the rear end wall portion, and a tip extension portion that extends from both ends of the central extension portion to a position that reaches the rear end wall portion, The angle between the central extension and the tip side extension is an obtuse angle, and the central extension and the tip side extension are connected by a circular arc. A structure for preventing soil and sand from entering.

3. The structure for preventing soil and sand intrusion according to claim 1, The trim is composed of a U-shaped trim mounting plate insertion portion that is open on the side where the trim mounting plate is inserted, and a hollow seal portion that is arranged at a position where it can abut against the soil intrusion prevention wall member. A structure for preventing soil and sand from entering.

4. The structure for preventing soil and sand intrusion according to claim 3, The seal portion is configured in a position and shape so as to be able to abut against the top portion of the soil / sand intrusion prevention wall member over a range from the top portion to the rear surface thereof when the rear door is closed. A structure for preventing soil and sand from entering.

Images