Work vehicle

Abstract

To provide a work vehicle capable of easily and reliably positioning a through hole formed in a stay on a radiator side and a screw hole formed on a main body frame side.SOLUTION: A work vehicle 1 is equipped with positioning mechanisms 40A, 40B having stays 430a, 430b provided along the vertical direction of a radiator 30 and flat plates 410a, 410b provided along the vertical direction of a main body frame 13. The stays 430a, 430b are formed with through holes 440a, 440b through which bolts 450a, 450b are inserted and with positioning openings 480a, 480b. The flat plates 410a, 410b are formed with screw holes 470a, 470b and positioning protrusions 420a, 420b having tapered portions. The openings 480a, 480b are formed so that the through holes 440a, 440b and the screw holes 470a, 470b overlap when the radiator 30 is closed.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] Well-known examples of work vehicles include crawler-type skid steer loaders and hydraulic shovels (also called power shovels, excavators, backhoes, etc.) that are used for excavating the ground and moving excavated soil and sand. Such work vehicles are configured such that various attachments, such as a bucket, chip breaker (also called simply a "breaker"), and auger device, can be detachably attached to the tip of an arm that is mounted on the front of the vehicle so as to be able to swing up and down, and predetermined work can be performed by detaching and replacing the attachments depending on the work purpose.

[0003] Also, as a work vehicle of this type, there is known one in which a cabin for an operator is provided on top of the vehicle and an engine is mounted behind the cabin, and a fan shroud and a radiator are provided behind the engine.

[0004] Here, the radiator is supported by a hinge on the main body frame of the work vehicle so as to be able to open and close freely, and is normally fixed by bolts etc. so as to cover the rear side of the engine. When performing maintenance work, the bolts can be removed and the radiator can be rotated a predetermined angle around the hinge as a fulcrum (see, for example, Patent Document 1).

[0005] In the work vehicle described in Patent Document 1, the radiator is supported by a plurality of hinges provided in the vertical direction of the main frame of the work vehicle, and is normally fixed by bolts while covering the rear side of the engine. Normally (except during maintenance work), the radiator is in a closed state, and at this time, a bolt is inserted into a through hole formed in an L-shaped stay attached to one side of the radiator, and the bolt is screwed into a screw hole formed on the main frame side to fix the radiator. During maintenance work, the bolt is removed and rotated to a predetermined angle by the hinge mechanism to open the radiator to a predetermined angle. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-39363 A Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, the work vehicle described in Patent Document 1 is a work vehicle that can improve the efficiency of maintenance work, but further improvements are required. For example, when transitioning to a closed state of the radiator, if the through hole formed in the L-shaped stay and the screw hole formed on the main body frame side are not accurately positioned, the bolt cannot be screwed into the screw hole when it is inserted.

[0008] However, the radiator itself is quite heavy, and when the radiator is opened or closed, its own weight causes the end of the radiator opposite the hinge (the pivoting end) to move downward, and when the radiator is closed, the position of the through hole formed in the L-shaped stay is misaligned with the position of the screw hole formed on the main frame. As a result, when the bolt is inserted into the through hole, it is not possible to screw the bolt into the screw hole. In such cases, a tool such as a chisel is used to lift the radiator and align the position of the through hole with the position of the screw hole before screwing the bolt into the screw hole, which takes a lot of time to close the radiator and secure it to the main frame.

[0009] The present invention has been made in consideration of these problems, and aims to provide a work vehicle that can easily and reliably position the through hole formed in the stay on the radiator side and the screw hole formed on the main frame side without troubling the worker when transitioning the radiator to a closed state. [Means for solving the problem]

[0010] [1] The work vehicle of the present invention is a work vehicle equipped with a radiator that can rotate around a rotation axis extending in the vertical direction, and is equipped with a positioning mechanism having a stay arranged along the vertical direction of the radiator and a flat plate arranged along the vertical direction of the main frame of the work vehicle, the stay is formed with a through hole through which a bolt for fixing the radiator to the main frame is inserted and an opening for positioning, the flat plate is formed with a screw hole through which the bolt is screwed and a positioning protrusion having a tapered portion that becomes larger in diameter at least toward the center vertically, and the opening is formed so that the opening is guided by the positioning protrusion and the positions of the through hole and the screw hole overlap when the radiator is closed.

[0011] [2] In the work vehicle of the present invention, it is preferable that the opening is formed in a position where the top of the positioning protrusion fits in so that the edge of the opening contacts the tapered portion and reaches the bottom of the tapered portion when the radiator transitions from an open to a closed state.

[0012] [3] In the work vehicle of the present invention, the opening is preferably a notch.

[0013] [4] In the work vehicle of the present invention, the opening is preferably a through hole. is preferred. Effect of the Invention

[0014] The work vehicle of the present invention is provided with a positioning mechanism consisting of a stay provided along the vertical direction of the radiator and a flat plate provided along the vertical direction of the main frame of the work vehicle, the stay is formed with a through hole and a positioning opening, and the flat plate is formed with a screw hole into which a bolt is screwed and a positioning protrusion having a tapered portion whose diameter increases at least toward the center in the vertical direction. The opening is formed so that the through hole and the screw hole are aligned when the radiator is closed by being guided by the positioning protrusion.

[0015] According to the above configuration, when the radiator is rotated to be fixed to the main body frame, the edge of the opening reaches the bottom while contacting the inclined surface of the positioning protrusion. Therefore, the height of the radiator is adjusted so that the position of the through hole of the stay and the position of the screw hole match by simply rotating the radiator, so that the radiator can be easily positioned at a position where the through hole and the screw hole overlap when the radiator is in the closed state. Therefore, it is possible to provide a work vehicle that can easily and reliably position the through hole formed in the stay on the radiator side and the screw hole formed on the main body frame side without bothering the worker when moving the radiator to the closed state. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a work vehicle 1 according to an embodiment, seen from the rear side, with the rear door removed, the engine hood open, and the radiator 30 closed (closed state). [Diagram 2] 2 is a diagram showing a state in which the radiator 30 of the working vehicle 1 shown in FIG. 1 is slightly open (open state). [Diagram 3] FIG. 13 is a diagram for explaining a positioning mechanism for fixing the radiator to the main body frame, showing the radiator in a slightly open state. [Figure 4] FIG. 4 is a right side view of FIG. [Diagram 5] FIG. 13 is a diagram for explaining a positioning mechanism for fixing the radiator to the main body frame, showing the radiator in a closed state. [Figure 6] FIG. 6 is a right side view showing a state in which the bolts have been tightened in comparison with FIG. 5. [Figure 7] 1A and 1B are diagrams showing a first example of a positioning protrusion, in which (a) is a side view and (b) is a perspective view. [Figure 8] 13A and 13B are diagrams showing a second example of a positioning protrusion, in which (a) is a side view and (b) is a perspective view. [Figure 9] 11A and 11B are diagrams showing a third example of a positioning protrusion, where (a) is a side view, (b) is an oblique view showing an example in which the tapered portion is dome-shaped, and (c) is an oblique view showing an example in which the tapered portion is kamaboko-shaped. [Figure 10] 11A and 11B are diagrams showing a fourth example of a positioning protrusion, where (a) is a side view, (b) is an oblique view showing an example in which the positioning protrusion is cone-shaped, and (c) is an oblique view showing an example in which the positioning protrusion is wedge-shaped. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A working vehicle 1 according to the embodiment will be described by taking as an example a crawler-type skid steer loader (hereinafter referred to as a crawler loader) with a bucket attached to the tip of an arm. First, the external configuration of the working vehicle 1 according to the embodiment will be described with reference to Figs. 1 and 2. Fig. 1 is a perspective view of the working vehicle 1 according to the embodiment seen from the rear side, and shows a state in which the radiator 30 is closed (closed state). Fig. 2 shows a state in which the radiator 30 of the working vehicle 1 shown in Fig. 1 is slightly opened (open state). In Figs. 1 and 2, the rear, right and top surfaces of the working vehicle 1 can be seen from among the front, rear, left and right sides and top surfaces. A rear door is provided behind the radiator 30 and the engine EG, but is omitted in Figs. 1 and 2. In Fig. 2, the same components as those shown in Fig. 1 are given the same reference numerals. In addition, the external configuration of the work vehicle 1 according to the embodiment is not the gist of the present invention, so only a brief description will be given. In the following description, the work vehicle 1 according to the embodiment may be abbreviated to simply "work vehicle 1."

[0018] In addition, in the following description, when discussing up, down, left, and right, the bottom side of the work vehicle 1 will be referred to as bottom and the side opposite the bottom as top, and the left side of the work vehicle 1 when viewed from the rear will be referred to as left, and the right side will be referred to as right.

[0019] As shown in FIG. 1, the work vehicle 1 has a pair of left and right running devices 12 each having an endless track (crawler) 11, a main body frame 13 to which the running devices 12 are attached on the left and right, and a cabin 15 provided in the upper center of the main body frame 13.

[0020] The cabin 15 is formed in a box shape, and a freely openable front door (not shown) is provided on the front side of the work vehicle 1. An operator's seat (not shown) on which an operator sits facing the front of the vehicle is provided inside the cabin 15, and remote control levers (operation levers) (not shown) for operating the traveling device 12 and the work device 14 are disposed on the left and right sides of the operator's seat.

[0021] The working device 14 has, as some of its components, an arm (not shown) arranged to surround the front, rear, left and right sides of the cabin 15, a pair of left and right hydraulic cylinders (arm cylinders: not shown) attached across the main body frame 13 and the arm, and a bucket (not shown) attached to the front end of the arm via a bracket (not shown).

[0022] The work vehicle 1 can be operated by an operator sitting in the operator's seat and operating an operating lever, which in turn drives the traveling device 12 to move the work vehicle 1 along the road, swings the arm up and down, and swings the bucket (not shown) up and down, depending on the operation of the operating lever.

[0023] Furthermore, the work vehicle 1 is provided with an engine EG at a position rearward of the cabin 15. The left and right sides of the engine EG are covered by the main body frame 13, and the top and rear are covered by an engine cover 18 and a rear door (not shown), respectively.

[0024] The engine cover 18 is provided by a hinge mechanism (not shown) so as to be able to be opened and closed in the vertical direction relative to the main body frame 13, and is normally held in a closed state relative to the main body frame 13 by a cover lock mechanism (not shown). On the other hand, the rear door is provided so as to be able to be opened and closed in the horizontal direction around a pair of upper and lower hinge mechanisms (not shown) provided along the vertical direction at the left end when the work vehicle 1 is viewed from the rear, and is normally held in a closed state relative to the main body frame 13 by a door lock mechanism (not shown).

[0025] When the cover lock mechanism (not shown) is unlocked and the engine cover 18 is opened, the engine EG is present. When the door lock mechanism (not shown) is unlocked and the rear door is opened, the radiator 30 is provided, and a fan shroud (not shown) and a radiator fan (not shown) are provided between the radiator 30 and the engine EG.

[0026] The radiator 30 is supported so as to be openable and closable from the front to the left (arrow a'-a direction) when opening the radiator 30, and from the front to the right (arrow a-a' direction) when closing it, by a hinge mechanism (not shown) provided at a plurality of positions (two positions) along the vertical direction on the left side of the main body frame 13 when the work vehicle 1 is viewed from the rear side. The radiator 30 is fixed to the main body frame 13 by inserting bolts into through holes formed in each of stays 430a, 430b provided at a plurality of positions (two positions) along the vertical direction on the right side of the radiator 30, and screwing bolts inserted into screw holes formed in flat plates 410a, 410b provided at a plurality of positions (two positions) along the vertical direction on the left side of the main body frame 13. A more detailed description will be given later.

[0027] [Positioning mechanism used to fix radiator 30 to the body frame] The positioning mechanisms 40A, 40B used to fix the radiator 30 to the main body frame 13 will be described below with reference to Figs. 3 to 6. Fig. 3 is a diagram for explaining the positioning mechanism for fixing the radiator to the main body frame, showing the radiator in an open state. Fig. 4 is a right side view of Fig. 3. Fig. 5 is a diagram for explaining the positioning mechanism for fixing the radiator to the main body frame, showing the radiator in a closed state. Fig. 6 is a right side view of Fig. 5.

[0028] Positioning mechanism 40A is a mechanism for easily and accurately positioning radiator 30 in a closed state by using a stay 430a attached to the upper side of the right end of radiator 30 and a flat plate 410a attached to the upper side of the right end of main body frame 13 as shown in Figures 3 to 6, inserting a bolt 450a into a through hole 440a formed in stay 430a, and positioning the inserted bolt 450a with a screw hole 470a formed in flat plate 410a.

[0029] The positioning mechanism 40B is a mechanism for easily and accurately positioning the inserted bolt 450b with the screw hole 470b formed in the flat plate 410b by using a stay 430b attached to the underside of the right end of the radiator 30 and a flat plate 410b attached to the underside of the right end of the main body frame 13 as shown in Figures 3 to 6, and inserting a bolt 450b into a through hole 440b formed in the stay 430b with the radiator 30 in a closed state.

[0030] When the work vehicle 1 is viewed from the rear side, L-shaped stays 430a, 430b are attached and fixed in the up-down direction to the right end portion of the radiator 30. The stays 430a, 430b are fixed to the radiator 30 by welding or the like, but may be formed integrally with the radiator 30. The stays are described as being L-shaped, but are not limited to this. Through holes 440a, 440b are formed in the centers of the stays 430a, 430b, respectively. Notches 480a, 480b are formed in the right end portions of the stays 430a, 430b, respectively.

[0031] Meanwhile, flat plates 410a, 410b are attached and fixed in the up-down direction of the right end portion of the main body frame 13 when the work vehicle 1 is viewed from the rear side. The flat plates 410a, 410b are fixed to the main body frame 13 by welding or the like, but may be formed integrally with the main body frame 13. A screw hole 470a and a positioning protrusion 420a are formed in the flat plate 410a. A screw hole 470b and a positioning protrusion 420b are formed in the flat plate 410b. The shape of the flat plates 410a, 410b may be any shape as long as there is an area in which the screw holes 470a, 470b into which the bolts 450a, 450b are screwed and the positioning protrusions 420a, 420b can be formed.

[0032] The positions of the screw holes 470a, 470b formed in the flat plates 410a, 410b, respectively, are preset to positions where the bolts 450a, 450b inserted into the through holes 440a, 440b, respectively, can be screwed in when the radiator 30 is in a closed state. The positions of the notches 480a, 480b formed in the stays 430a, 430b, respectively, are preset to positions where the opening edges of the notches 480a, 480b come into contact with bottoms 4205a, 4205b (see FIGS. 4 and 6) of the tapered portions 4201a, 4201b, which will be described later, respectively, when the radiator 30 is in a closed state.

[0033] As shown in FIG. 4 and FIG. 6, the positioning protrusion 420a is formed of a tapered portion 4201a having a tapered diameter and a cylindrical portion 4202a. The positioning protrusion 420b is formed of a tapered portion 4201b having a tapered diameter and a cylindrical portion 4202b. The tapered portions 4201a and 4201b may have any shape as long as the diameter of the cross section gradually becomes larger as it goes downward (toward the flat plates 410a and 410b). As the shape of the positioning protrusions 420a and 420b, various shapes are possible as described later. In addition, in the tapered portions according to the first to fourth examples described later, the large diameter, small diameter, length, etc. are appropriately designed according to the size of the openings (openings) of the notches 480a and 480b. The shape of one of the positioning protrusions 420a and 420b may be different from that of the other. Incidentally, the positioning protrusions 420a and 420b shown in Figures 3 to 6 correspond to the following first example. Some shapes of the positioning protrusions will be introduced below with reference to Figures 7 to 10, but the present invention is not limited to these.

[0034] Fig. 7 shows a first example of the positioning protrusion, (a) being a side view and (b) being a perspective view. The positioning protrusion 420a shown in Fig. 7 is formed with a truncated cone-shaped tapered portion 4201a having a top portion 4203a, a slant surface 4204a and a bottom portion 4205a of the slant surface, and a cylindrical portion 4202a extending downward from the bottom portion 4205a. Although not shown, the positioning protrusion 420b has the same configuration as the positioning protrusion 420a, so its description will be omitted. Similarly, only one of the positioning protrusions will be described in the following other examples.

[0035] Fig. 8 shows a second example of the positioning protrusion, where (a) is a side view and (b) is a perspective view. The positioning protrusion 520a shown in Fig. 8 is formed with a cone-shaped tapered portion 5201a having a top portion 5203a, a slope 5204a, and a bottom portion 5205a, and a cylindrical portion 5202a extending downward from the bottom portion 5205a.

[0036] 9 is a diagram showing a third example of the positioning protrusion, where (a) is a side view, (b) is a perspective view showing an example in which the tapered portion is dome-shaped, and (c) is a perspective view showing an example in which the tapered portion is kamaboko-shaped. The positioning protrusion 620a shown in FIG. 9 is formed with a tapered portion 6201a having a semicircular vertical section including a top portion 6203a, a slope 6204a, and a bottom portion 6205a, and a cylindrical portion 6202a (a square pillar 6202a in the example of FIG. 9(c)) extending downward from the bottom portion 6205a. In the third example, the tapered portion 6201a and the cylindrical portion (square pillar portion) 6202a are shown as being formed independently, but the tapered portion 6201a and the cylindrical portion (square pillar portion) 6202a may be formed integrally. For ease of explanation, the cylindrical portion and the rectangular prism portion are both designated by the reference numeral 6202a.

[0037] Fig. 10 shows a fourth example of the positioning protrusion, where (a) is a side view, (b) is a perspective view showing an example in which the positioning protrusion is conical, and (c) is a perspective view showing an example in which the positioning protrusion is wedge-shaped. The positioning protrusion 720a shown in Fig. 10 is configured with a top portion 7203a, a sloping surface 7204a, and a bottom portion 7205a, and is not configured with a tapered portion and a cylindrical portion, unlike the first to third examples described above.

[0038] The positioning mechanisms 40A and 40B when the radiator 30 is moved from an open state to a closed state will be described below. The radiator 30 is normally closed to cover the radiator fan except during maintenance work, but during maintenance work, the bolts fixing the radiator 30 to the main body frame 13 are removed and the radiator 30 is rotated to a predetermined angle by the hinge mechanism to open to the side at a predetermined angle. First, the basic configuration of the positioning mechanism 40A will be described. The basic configuration of the positioning mechanism is almost the same for the positioning mechanisms 40A and 40B.

[0039] Although the following description will be given of a case where there are two positioning mechanisms 40A and 40B, it is also possible to have only the positioning mechanism 40A or only the positioning mechanism 40B. Also, in the above embodiment, the description has been given of a case where there are two positioning mechanisms for the radiator 30, but it is of course also applicable to a case where there are three or more positioning mechanisms.

[0040] (Positioning mechanism 40A) When radiator 30 is moved toward main body frame 13, notch 480a in stay 430a reaches top head 4203a of positioning protrusion 420a as shown in FIG. 4, and when radiator 30 is moved further toward main body frame 13, the edge of notch 480a contacts slope 4204a of tapered portion 4201a and reaches bottom 4205a of positioning protrusion 420a as shown in FIG. 6, and the positions of through hole 440a and screw hole 470a match.

[0041] (Positioning mechanism 40B) While the above-described positioning mechanism 40A easily and accurately performs positioning when the upper right end of the radiator 30 is bolted to the main body frame 13, the positioning mechanism 40B easily and accurately performs positioning when the lower right end of the radiator 30 is bolted to the main body frame 13. When the radiator 30 is moved toward the main body frame 13, as shown in Figure 4, the notch 480b of the stay 430b reaches the top head 4203b of the positioning protrusion 420b, and when the radiator 30 is further moved toward the main body frame 13, as shown in Figure 6, the edge of the notch 480b contacts the slope 4204b of the tapered portion 4201b and reaches the bottom 4205b of the positioning protrusion 420b, and the positions of the through hole 440b and the screw hole 470b match.

[0042] Thereafter, bolts 450a, 450b are inserted into through holes 440a, 440b formed in the stays 430a, 430b, respectively, and the bolts are screwed into screw holes 470a, 470b formed in the flat plate, thereby fixing the radiator 30 to the main body frame 13.

[0043] Thus, the work vehicle 1 according to the embodiment is provided with positioning mechanisms 40A, 40B having stays 430a, 430b provided along the up-down direction of the radiator 30 and flat plates 410a, 410b provided along the up-down direction of the main body frame 13, and the stays 430a, 430b are formed with through holes 440a, 440b through which bolts 450a, 450b for fixing the radiator 30 to the main body frame 13 are inserted, and positioning notches (openings) 480a, 480b are formed. Then, the flat plates 410a, 410b are formed with screw holes 470a, 470b into which the bolts 450a, 450b are screwed, and with positioning protrusions 420a, 420b having tapered portions 4201a, 4201b. The cutouts (openings) 480a, 480b are formed so that the through holes 440a, 440b and the screw holes 470a, 470b overlap with each other when the cutouts (openings) 480a, 480b are guided by the positioning protrusions 420a, 420b and the radiator 30 is in a closed state.

[0044] Therefore, by providing the positioning mechanisms 40A and 40B as described above, when the radiator 30 is rotated to be fixed to the main body frame 13, the edges of the notches 480a and 480b reach the bottoms 4205a and 4205b while contacting the inclined surfaces 4204a and 4204b of the tapered portions 4201a and 4201b. As a result, even if at least one of the through hole 440a and the screw hole 470a, or the through hole 440b and the screw hole 470b is slightly misaligned due to the weight of the radiator 30, the positions of the through hole 440a and the screw hole 470a, and the through hole 440b and the screw hole 470b are accurately aligned by simply continuing to rotate the radiator 30 toward the main body frame 13, so that the radiator 30 can be easily positioned on the main body frame 13 and the radiator 30 can be fixed to the main body frame 13 in a short time. In addition, when the radiator 30 rotates, the cutouts 480a, 480b as openings reach the tops 4203a, 4203b of the positioning protrusions 420a, 420b, so that the tops 4203a, 4203b of the positioning protrusions 420a, 420b fit within the openings of the cutouts 480a, 480b. This allows the radiator 30 to be more reliably positioned on the main frame 13.

[0045] Furthermore, even if the weight of the radiator 30 causes some misalignment between the through holes 440a, 440b and the screw holes 470a, 470b, when attaching and fixing the radiator 30 to the main body frame 13, it is no longer necessary to use a tool such as a chisel to lift the radiator 30 upward, and the attachment and fixing work can be performed efficiently and safely.

[0046] (Modification) In the above-mentioned embodiment 1, a case where a notch is formed as an opening in the stay as a positioning mechanism has been described, but the opening may be a through hole instead of a notch. The shape of the through hole is preferably a circle having a diameter roughly the same as the diameter of the bottom of the positioning protrusion, but is not limited thereto, and may be, for example, an ellipse or a square. With this configuration, the strength of the stay is improved because there is a periphery of the hole compared to a notch.

[0047] It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. For example, in the above-described embodiment, the present invention is applied to a crawler loader, but the present invention can also be applied to work vehicles other than crawler loaders. [Explanation of symbols]

[0048] 1 ··· work vehicle (crawler loader), 11 ··· endless track, 12 ··· running gear, 13 ··· main body frame, 15 ··· cabin, 18 ··· engine cover, 30 ··· radiator, 40A, 40B ··· positioning mechanism, 410a, 410b ··· flat plate, 420a, 420b ··· positioning protrusion, 430a, 430b ··· stay, 4 40a, 440b... Through hole, 450a, 450b... Bolt, 470a, 470b... Screw hole, 480a, 480b... Notch (opening), 4201a, 4201b... Tapered portion, 4203a, 4203b... Top, 4204a, 4204b... Slope (slope of tapered portion), 4205a, 4205b... Bottom of tapered portion

Claims

1. A work vehicle including a radiator that is rotatable around a rotation axis extending in a vertical direction, a positioning mechanism including a stay provided along a vertical direction of the radiator and a flat plate provided along a vertical direction of a body frame of the work vehicle, The stay is formed with a through hole through which a bolt for fixing the radiator to the main body frame is inserted and a positioning opening, The flat plate is formed with a screw hole into which the bolt is screwed and a positioning protrusion having a tapered portion whose diameter increases at least toward the center in the vertical direction, The opening is formed such that the through hole and the screw hole are aligned in a position when the opening is guided by the positioning protrusion and the radiator is closed. A work vehicle characterized by:

2. 2. The work vehicle according to claim 1, the opening is formed at a position where a top head of the positioning protrusion fits in such a way that an edge of the opening reaches a bottom of the tapered portion while contacting the tapered portion when the radiator is moved from an open state to a closed state. A work vehicle characterized by:

3. 3. The work vehicle according to claim 1, The opening is a notch. A work vehicle characterized by:

4. 3. The work vehicle according to claim 1, The opening is a through hole. A work vehicle characterized by:

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