Work vehicles

Abstract

To provide a work vehicle that makes it easy to secure engine compartment volume and minimizes the impact on the appearance of the engine cover due to dimensional errors or misalignment during assembly when fixing the engine cover to the frame. [Solution] A base 13, which is the mounting portion for the engine cover 20, is fixed to the upper surface of the frame body 12. The base 13 is constructed by combining multiple plate-like members in a shape that follows the outer edge of the upper surface of the frame body 12, such that the surface facing outward into the engine compartment is located inside the engine compartment rather than the outer edge of the frame body 12. Each plate-like member is arranged so that its upper surface is continuous. The engine cover 20 is placed on the upper surface of the base 13 and fixed with bolts B with its flat portion 201 in surface contact. As a result, a decorative groove 30 is formed around the entire circumference between the upper surface of the frame body 12 and the lower surface of the engine cover 20, equal to the thickness of the base 13.

Description

Technical Field

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

Background Art

[0002] Conventionally, as shown in the front view of Patent Document 1, the body of a work vehicle such as a crawler drill is configured by fixing an engine cover to the upper part of a frame. Components such as an engine, hydraulic equipment, and a compressor necessary for the operation of the crawler drill are mounted on the frame, and the engine cover is configured by combining members based on a plane in order to efficiently secure the volume of the internal space.

[0003] In order to improve the aesthetic appearance of such a work vehicle, the wall surface of the engine cover is fixed so as to be flush with the side and rear surfaces of the frame. Note that a gap of about 2 mm is provided between the upper surface of the frame and the bottom surface of the engine cover so that the surfaces that are flush with each other are substantially continuous while avoiding contact due to vibration or the like.

[0004] Hitherto, a fixing member for the frame has been welded to the engine cover, and the frame and the engine cover have been fixed by bolt-fixing the fixing member and the frame. Therefore, in order to keep the engine cover and the frame flush with each other and keep the gap between them constant, the engine cover has been adjusted to be disposed at an appropriate fixing position by methods such as forming a long hole on the side of the frame or sandwiching a shim at the fixing portion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

[0006] However, as mentioned above, it is not easy to fix the engine cover wall flush with the frame. This is because the engine cover is a large structure, and dimensional errors during manufacturing or slight misalignments during assembly can have a significant impact on other parts.

[0007] On the other hand, some work vehicles, such as the hydraulic excavator disclosed in Patent Document 2, are mounted such that the engine cover (reference numeral 23) is contained within the ridge of the frame (reference numeral 9) when viewed from above, as shown in Figure 3 of the same document.

[0008] This configuration makes it difficult for observers to notice if the engine cover is fixed in a position that is not ideal on the frame, thus avoiding the difficulties that arise when attaching the frame to the engine cover so that it is flush with the frame. On the other hand, adopting this fixing method results in a different appearance compared to when the engine cover is fixed flush with the frame. Furthermore, because the frame protrudes outward, the volume of the engine compartment decreases, making it difficult to enlarge the engine or add additional equipment.

[0009] In view of these circumstances, the present invention aims to provide a work vehicle that makes it easy to secure the volume of the engine compartment and in which dimensional errors and misalignments during assembly when fixing the engine cover to the frame do not easily affect the appearance. [Means for solving the problem]

[0010] The first invention is a work vehicle comprising a frame that constitutes the vehicle body and on which an engine and the like are fixed to the upper part, and an engine cover fixed on the frame and defining an engine compartment inside, wherein the frame comprises a frame body on which the engine and the like are fixed, and a base on which the engine cover is placed, the engine cover has a flat portion formed on its bottom surface, the outer edge of the flat portion having the same shape as the outer edge of the portion on the upper surface of the frame body on which the flat portion is placed, the base is fixed along the outer edge of the upper surface of the frame body such that the surface facing outward from the engine compartment is located on the side of the engine compartment that is closer to the inside of the engine compartment than the outer edge of the upper surface of the frame body, and a decorative groove is formed between the upper surface of the frame and the lower surface of the engine cover by the frame body, the base, and the engine cover.

[0011] The second invention is a work vehicle characterized in that the decorative groove described in the first invention has a distance of 15 mm or more and 25 mm or less between the upper surface of the frame and the bottom surface of the engine cover.

[0012] The third invention is a work vehicle characterized in that the base described in the first or second invention is configured to have a continuous upper surface.

[0013] The fourth invention is a work vehicle characterized in that the base described in the third invention is constructed by arranging a plurality of plate-shaped members side by side.

[0014] The fifth invention is a work vehicle characterized in that the base described in the third invention is fixed to the frame by fillet welding, and the fillet welding is applied intermittently only to the side of the base facing inward towards the engine compartment.

[0015] The sixth invention is a work vehicle characterized in that, in addition to the above-ground surface of the base described in the fifth invention, a plurality of tap seats for fixing the engine cover onto the base are formed thereon, and substantially all of the fillet welds are performed in positions that overlap with the tap seats when viewed from the width direction of the base.

[0016] The seventh invention is a work vehicle characterized in that the base described in the fifth invention is further fixed to the frame by plug welding, and the plug welding is performed at multiple positions that do not overlap with the fillet welding when viewed from the width direction of the base.

[0017] The eighth invention is a work vehicle characterized in that, between the base and the frame described in the third invention, caulking material is filled over the entire area from the side of the decorative groove.

[0018] The ninth invention is a work vehicle characterized in that at least one of the corner portion between the upper surface of the frame body described in the first invention and the surface extending from the outer edge of the upper surface of the frame body, and the corner portion between the flat portion and the surface extending from the outer edge of the flat portion, is rounded.

[0019] The tenth invention is a work vehicle characterized in that the engine cover described in the first invention is provided with a support frame portion in which a member having a cross section perpendicular to its longitudinal direction formed in the shape of a lip groove is disposed such that the opening portion faces the inside of the engine compartment, and a part of the components mounted on the vehicle body is fixed to the support frame portion.

[0020] The eleventh invention is a work vehicle characterized in that a work machine mounted separately from the engine cover on the frame body described in the first invention is a drilling device for drilling blast holes in a construction target such as rock.

[0021] The twelfth invention is a work vehicle in which a working machine separately mounted on the frame body described in the tenth invention is a drilling device for drilling blasting holes in a construction target such as a rock formation, and the component fixed to the support frame portion is a dust collector for collecting chips generated during drilling.

Advantages of the Invention

[0022] According to the present invention, it is possible to provide a work vehicle in which it is easy to secure the volume of the engine room, and dimensional errors and misalignments during assembly hardly affect the appearance when fixing the engine cover to the frame.

Brief Description of the Drawings

[0023] [Figure 1] It is a perspective view showing a crawler drill according to an embodiment of the present invention. [Figure 2] It is a side view showing the vehicle body of a crawler drill according to an embodiment of the present invention. [Figure 3] It is a rear view showing the vehicle body of a crawler drill according to an embodiment of the present invention. [Figure 4] It is a top view showing the frame of a crawler drill according to an embodiment of the present invention. [Figure 5] It is an enlarged view of part I shown in FIG. 3. [Figure 6] (a) Cross-sectional view taken along line A-A shown in FIG. 1, (b) Enlarged view showing part II of (a), (c) Cross-sectional view of the support frame showing a specific shape of the lip groove. <E [Figure 7] (a) Cross-sectional view taken along line B-B shown in FIG. 1, (b) Cross-sectional view taken along line C-C shown in FIG. 1. [Figure 8] (a) Cross-sectional view taken along line D-D shown in FIG. 2, (b) Cross-sectional view taken along line E-E shown in FIG. 2.

Modes for Carrying Out the Invention

[0024] Embodiments of the present invention will be described with reference to the drawings as appropriate. Note that the drawings are schematic. Therefore, it should be noted that the relationship and ratios between thickness and planar dimensions may differ from those in reality, and there may be differences in dimensional relationships and ratios between drawings. Furthermore, the embodiments described below illustrate devices and methods for realizing the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the material, shape, structure, arrangement, etc., of the components.

[0025] In the following explanations and diagrams, when a work vehicle is placed on level ground, the direction in which the work vehicle moves forward may be described as "forward," and the direction in which it moves backward may be described as "rear." Furthermore, the definitions of "left side," "right side," "upper side," and "lower side" are defined based on the direction as seen from the perspective of the occupant of the work vehicle, in accordance with the definitions of the forward and backward directions. Furthermore, "front," etc., will be defined according to the above definitions. Note that if there is no need to distinguish between left and right, it will be described simply as "side."

[0026] The detailed structure of the relevant parts will be described later, but when we refer to the "outer edge of the upper surface of the frame body 12" and the "outer edge of the flat portion 201," we are referring to the intersection point when each surface is virtually extended in the case where the corners have been rounded, that is, the edge connecting the vertices of the corners in the case where the corners have not been rounded.

[0027] <Structure of a crawler drill> Referring to Figure 1, the structure of the crawler drill, which is a work vehicle, will be briefly explained. The crawler drill 1 is constructed by attaching a drilling device 4 to a traveling carriage 2. The drilling device 4 is a work machine that drills blast holes in construction targets such as rock formations. The traction vehicle is a known configuration in which the traction device 5 and the operator cabin OC are attached to the car body 3. Since this invention relates only to the structure of the vehicle body 3, descriptions of other parts will be omitted in the following explanation. In other words, this invention is applicable to any vehicle body with a similar configuration, regardless of the configuration of other parts.

[0028] <Vehicle body structure> The structure of the vehicle body will be outlined with reference to Figures 2 and 3. The vehicle body 3 consists of a frame 10 on which the running gear 5 is mounted at the bottom, and an engine cover 20 mounted on the top of the frame 10. The engine cover 20 is fixed on top of the frame 10 and covers the top, sides, and rear of the components, defining the engine compartment inside. Furthermore, the engine cover 20 is configured so that a portion of the front of the frame 10 protrudes, and the operator cabin OC and the drilling device 4 are installed in the portion of the frame 10 that is not covered by the engine cover 20. The engine compartment houses the engine, hydraulic and pneumatic equipment, and other components necessary for the operation of the crawler drill (not shown in the diagram).

[0029] <frame structure> The structure of the frame 10 will be described with reference to Figures 4 and 5. In these figures, the upper side of the drawing is the rear side of the vehicle. The present invention is characterized by the shape of the end portions on the vehicle side and rear side of the frame body 12 and the base 13, which will be described later, so the description of other parts will be omitted. In other words, the parts of the frame body 12 other than the end portions on the vehicle side and the end portions on the vehicle rear, and the parts other than the base 13 are publicly known and can be modified as appropriate according to the specifications required for the work vehicle.

[0030] As shown in Figure 4, the frame 10 is constructed by fixing a base 13, which is the mounting part for the engine cover 20, to the upper surface of the frame body 12, which is the part on which the components and engine cover 20 are mounted. The base 13 is constructed by combining multiple plate-like members in a shape that follows the outer edge of the upper surface of the frame body 12, such that the surface facing outward from the engine compartment is located inside the engine compartment, beyond the outer edge of the frame body 12. The plate-like members are arranged so that their upper surfaces are continuous. Specifically, the vehicle has a U-shape, with long plate-like members 13A and 13C positioned on the right and left sides of the vehicle, and a long plate-like member 13B positioned at the rear of the vehicle. In the following explanation, when it is not necessary to distinguish between the members, they will be referred to as the base 13. The width direction of the base 13 refers to the shorter side direction of each member when viewed from above.

[0031] A plate 14 is fixed to the rear side of the frame body 12, protruding from the rear of the vehicle. The plate 14 is a component for attaching shackles or the like when towing a work vehicle. Since the plate 14 has the same thickness as the base 13, the top surface of the base 13 and the top surface of the plate 14 are flush. In addition, the plate-shaped member 13B on the rear side of the vehicle is divided into the right side and the left side of the vehicle by the plate 14, and when it is fixed to the frame body 12, the plate 14 is fixed so that it is sandwiched between the left and right sides without any gaps.

[0032] As shown in Figure 5, the base 13 has multiple through holes formed at various locations, extending from its top surface to its bottom surface. One end of these through holes is a tap seat 131 that engages with a male screw for bolting the engine cover 20, and the other end is a welding hole 132 into which a plug weld is made to the frame body 12. The plug weld is performed to reinforce the fixation by fillet welding 15, which will be described next. The tap seat 131 is formed so that when the engine cover 20 is fixed in place, it is located within the range of an opening such as the maintenance door 21 or the radiator grille 24, which will be described later.

[0033] The base 13 is fixed to the frame body 12 by intermittent fillet welds 15 on the side facing the inside of the engine compartment. Specifically, almost all of the fillet welds 15 are applied to a certain section centered on the part where the tap seats 131 are formed when viewed from the width direction of the base 13. Here, "almost all" means that it is not necessarily required that all the tap seats 131 and the fillet welds 15 overlap when viewed from the width direction of the base 13, and that one or two exceptions are allowed on the entire base 13. Furthermore, the entire surface facing outwards from the vehicle is continuously filled with sealant 16.

[0034] <Engine cover structure> The structure of the engine cover 20 will be described with reference to Figures 2, 3, and 6. The engine cover 20 is a box-shaped component mainly made of sheet metal, with its front and bottom surfaces open. In particular, the outer edge of the bottom surface is the same shape as the outer edge of the portion on the upper surface of the frame body 12 on which it is mounted. That is, the width of the engine cover 20 is equal to the width of the frame 10, and its length in the front-rear direction is equal to the length from the rear surface of the frame 10 to elements located outside the engine compartment, such as the operator's cabin. In this embodiment, when the engine cover 20 is fixed in an ideal position on the frame 10, the surfaces facing right, the surfaces facing left, and the surfaces facing rear are flush. On the other hand, if, for example, a surface facing the rear right is formed between the surface facing right and the surface facing rear, then these surfaces facing the rear right are also fixed so that they are flush.

[0035] As shown in Figure 2, the engine cover 20 is equipped with maintenance doors 21 on its side. The maintenance doors 21 are provided as double doors, with a front door 211 and a rear door 212. The front door 211 is held in a closed position by the rear door 212, which has an opening and closing lever. The rear door 212 is positioned so that its inner side faces the engine, which is fixed to the frame 10.

[0036] A dust collector 22, one of the components, is fixed to the rear of the vehicle beyond the maintenance door 21. The dust collector 22 is a device for collecting the dust generated during drilling, and although not shown in the figure, it is connected to the tip of the drilling device by an intake pipe. As shown in Figure 3, the dust collector 22 is located outside the engine compartment and is directly fixed to the side of the engine cover 20. Inside the dust collector 22 are an intake device and a filter that protects the intake device from dust, and it is a particularly large mass element as an element directly fixed to the engine cover 20.

[0037] Therefore, as shown in Figure 6(a), a support frame portion 23 is provided at the fixing portion of the dust collector 22 in the engine cover 20. As shown in Figures (b) and (c), the support frame portion 23 is composed of a member with a lip groove cross-section whose opening faces the inside of the engine compartment. Specifically, as shown in Figure 2, the support frame portion 23 is formed by cutting out the engine cover 20 in the portion where the support frame portion 23 is located. A rectangular frame-shaped member is fixed to this cutout, and a cross-shaped lip groove-shaped member is further fixed inside this frame. Note that the components constituting the frame portion do not necessarily have to be made of lip groove-shaped members.

[0038] Due to this structure, four through-holes are formed around the support frame portion 23, penetrating from the outer surface to the inner surface of the engine cover 20. In this embodiment, the panel 231 is fitted to fill these through-holes, thus sealing the openings. The panel 231 and the support frame portion 23 are fixed by welding only in the portion located inside the engine compartment, while the portion located outside the engine compartment is filled with sealant.

[0039] Furthermore, as shown in Figure 3, two radiator grilles 24 are fixed to the rear surface of the engine cover 20, side by side. The radiator grilles 24 face the radiator inside the engine compartment and are fixed to the rear surface of the engine cover 20 in an opening 25 formed on the rear surface so as to be flush with the rear surface.

[0040] <Structure of the engine cover mounting part> The structure of the fixing portion of the engine cover 20 will be described with reference to Figures 7 and 8. As shown in these figures, the engine cover 20 is placed on the upper surface of the base 13 and secured by bolts B with the flat portion 201 in surface contact with it. The flat portion 201 has a through hole 26 that overlaps with the tap seat 131 when the engine cover 20 is placed on the base 13.

[0041] As shown in Figure 7(a), the portion of the engine cover 20 located below the maintenance door 21 is bent into a U-shape in cross-section, with the opening facing the inside of the engine compartment when viewed from the rear of the vehicle. A through-hole 27 is provided coaxially with the through-hole 26 for the head of the bolt B to pass through, and a bolt seat 28 is provided inside the U-shape to position the head of the bolt B higher than the base 13.

[0042] In other words, when a worker fastens bolt B in that area, they open the maintenance door 21 and rotate the bolt B through the through hole 27 until the head of the bolt B is seated on the bolt seat 28. Similarly, when fastening bolts in other areas, opening the opening allows access to the tap seat 131. For example, in the case of the radiator grille 24, the work can be done by removing the radiator grille 24 from the engine cover 20.

[0043] As shown in Figure (b), the frame body 12 and the base 13 are fixed together by plug welding, with the welding hole 132 filling its own interior. In addition, the engine cover 20 in the area where bolt B is not located is a flat surface that follows the vertical direction of the vehicle.

[0044] As shown in Figure 8(a), the portion of the engine cover 20 to which the radiator grille 24 is fixed is bent into a U-shape, similar to the maintenance door 21. However, because the radiator grille 24 has a smaller bend at its ends than the maintenance door 21, the U-shaped portion also functions as a bolt seat. As shown in Figure (b), the corners between the side and rear surfaces of the engine cover 20 are formed by combining plate-like members to create a vertically elongated box-shaped lower frame 29.

[0045] With the frame body 12, base 13, and engine cover 20 configured in this way, a decorative groove 30 is formed around the entire circumference between the upper surface of the frame body 12 and the lower surface of the engine cover 20, for the thickness of the base 13. The vertical width of the decorative groove 30 is adjusted by the thickness of the base 13 so that it is between 15 mm and 25 mm. This is because if the width of the decorative groove 30 is too narrow, the misalignment between the frame 10 and the engine cover 20 becomes more noticeable, and if it is too wide, it tends to give an appearance different from a continuous surface.

[0046] Furthermore, the lower part of the engine cover 20 is bent by approximately 90 degrees so that its lower end surface faces the inside of the engine compartment, forming a flat portion 201. In other words, this configuration rounds the corner between the outer edge of the flat portion 201 and the surface extending from the flat portion 201. Furthermore, the corner portion between the outer edge of the upper surface of the frame body 12 and the surface extending from that upper surface is also rounded.

[0047] <Effects> As described above, the decorative groove 30 has the effect of maximizing the volume of the engine compartment while making it difficult to notice any misalignment from the surface when the frame 10 and the engine cover 20 are fixed together. In other words, compared to cases where decorative grooves are not formed, the acceptable dimensional tolerance of the components and deviations during assembly can be increased, making it possible to reduce the labor required for manufacturing and assembly while maintaining aesthetic appeal.

[0048] Furthermore, by rounding the end faces of the portion of the frame 10 that forms part of the decorative groove 30 and the lower end of the engine cover 20 toward the inside of the engine compartment, it is possible to make the misalignment even more difficult to notice.

[0049] By forming a flat portion 201 on the lower part of the engine cover 20 and placing the flat portion 201 on the upper surface of the base 13 to fix the engine cover 20, it is possible to fix the engine cover 20 and the base 13 without forming a gap between them. Therefore, rattling of the engine cover 20 is suppressed, and a stable holding state can be maintained. In particular, while the crawler drill is in operation, vibrations are generated not only by the engine but also by the operation of the running gear, drilling device, and dust collector 22. By suppressing the vibration of the engine cover 20 in conjunction with these vibrations, the generation of abnormal noises and loosening of bolts can also be suppressed, thus reducing maintenance costs. In addition, since the openings in the engine compartment are reduced, the operating noise of the engine and other components can also be reduced.

[0050] Furthermore, by placing and fixing the flat section 201 onto the base 13, it is possible to achieve airtightness between the frame 10 and the engine cover 20 without fixing airtight urethane foam inside the engine cover 20, as in conventional methods. Therefore, airtight sealing can be performed more cheaply and easily than before. Since the performance of the radiator changes depending on the airflow in the engine compartment, this type of airtight sealing also contributes to improving the overall performance of the work vehicle.

[0051] The airtight seal provided by the sealant 16 prevents not only the movement of air but also the movement of liquids. Therefore, it prevents rainwater and other liquids accumulated inside the engine compartment from leaking out to the outside of the engine compartment. Such leakage can accelerate rusting of the frame 10 and negatively affect the appearance of the vehicle body 3, so the airtight seal provided by the sealant 16 also contributes to maintaining aesthetics.

[0052] The base 13 is fixed to the frame body 12 by fillet welds 15 and plug welds in the weld holes 132. In this case, if fillet welds 15 are performed continuously, the high heat generated during welding may cause deformation of the member, and setting appropriate welding conditions requires considerable effort. Therefore, by performing fillet welds 15 intermittently, deformation of the member due to high heat can be suppressed. Furthermore, by performing fillet welds, the fixing strength of the base 13 can be improved.

[0053] Furthermore, the tap seat 131 portion of the base 13, which is prone to loads due to vibration, is formed in a position that overlaps with the fillet weld 15 when viewed from the width direction of the base 13. Of the fixing parts between the frame 10 and the base 13, the tap seat 131 portion, which is the fixing part of the engine cover 20, requires high joint strength. Therefore, with the fillet weld 15 and the tap seat 131 in this positional relationship, it is possible to fix the base 13 with a minimum amount of fillet welding 15, thereby reducing manufacturing costs.

[0054] By fixing the dust collector 22 to the engine cover 20, it is possible to increase the volume of the engine compartment by the amount of the dust collector 22. In addition, it is possible to prevent dust from entering the engine compartment when cleaning the inside of the dust collector 22. Furthermore, by constructing the support frame portion 23 by bending the engine cover 20, the engine cover 20 can be made lighter than when a separate component is fixed.

[0055] <Variation> In the embodiment, a configuration in which the dust collector 22 is fixed to the outside of the engine compartment was described as an example, but in the application of the present invention, it is not necessarily required to be in such a configuration, and the dust collector 22 may be housed inside the engine compartment. Even in such a configuration, if the engine cover 20 is equipped with a support frame portion 23, the dust collector 22 can be stably supported. Furthermore, the support frame portion 23 may also be configured such that a square tube is fixed to the engine cover 20, and the present invention does not necessarily require the dust collector 22 to be fixed to the engine cover 20; it can also be applied to configurations where it is fixed to the frame 10.

[0056] In the embodiment, a configuration in which the corners between the top and side surfaces of the frame 10 and the lower end portion of the engine cover 20 are rounded was described as an example. However, this structure is not essential to the present invention as it improves the effect of forming the decorative groove 30. Therefore, it is not necessarily required that these corner portions be rounded when applying the present invention. Furthermore, a structure in which only the corner portion on either the frame 10 side or the engine cover 20 side is rounded is also possible.

[0057] In the embodiment, a configuration in which caulking material 16 is filled between the frame 10 and the base 13 from the side of the decorative groove 30 was described as an example. However, filling with caulking material 16 is not essential when applying the present invention. Alternatively, a configuration may be used in which airtightness is achieved by welding the entire area without using caulking material.

[0058] In the embodiment, the base 13 was described as having a configuration in which plate-shaped members 13A to 13C are arranged in a U-shape and fixed to the frame 10 by fillet welding 15 and plug welding. However, such a structure is not essential for the application of the present invention, and other structures may be used, for example, by fixing a integrally molded U-shaped member (viewed from above) with bolts.

[0059] In the embodiment, a configuration in which a flat portion 201 is formed at the lower part of the engine cover 20 and the engine cover 20 is placed and fixed on the base 13 was described as an example. However, this structure is not essential for the application of the present invention. For example, the base 13 may be a member with a vertical cross-section formed in an inverted L shape, and may be fixed to the vertical surface of the engine cover 20 from the inside of the engine compartment. Even with such a structure, it is possible to obtain the effects of the decorative groove 30. [Explanation of symbols]

[0060] Crawler drill...1, Traveling chassis...2, 3...Vehicle body, Drilling device...4, Traveling device...5, 10...Frame, 12...Frame body, 13...Base, 131...Tap seat, 132...Welding hole, 14...Plate, 15...Fillie weld, 16...Caulking material, 20...Engine cover, 21...Maintenance door, 211...Front vehicle door, 212...Rear vehicle door, 23...Support frame section, 24...Radiator grille, 25...Opening, 26, 27...Through hole, 28...Bolt seat, 29...Lower frame, 30...Decorative groove, B...Bolt,

Claims

1. A work vehicle comprising a frame that forms the body and on which components such as an engine are mounted, and an engine cover fixed on the frame and defining an engine compartment inside, The frame comprises a frame body on which the engine and the like are fixed, and a base on which the engine cover is mounted. The engine cover has a flat portion formed on its bottom surface, and the outer edge of the flat portion has the same shape as the outer edge of the portion on the upper surface of the frame body on which the flat portion is placed. The base is fixed along the outer edge of the upper surface of the frame body such that the surface facing outward from the engine compartment is located on the side of the upper surface of the frame body that is closer to the interior of the engine compartment than the outer edge of the upper surface of the frame body. A work vehicle characterized in that a decorative groove is formed between the upper surface of the frame and the lower surface of the engine cover by the frame body, the base, and the engine cover.

2. The work vehicle according to claim 1, characterized in that the decorative groove is such that the distance between the upper surface of the frame and the lower surface of the engine cover is 15 mm or more and 25 mm or less.

3. The work vehicle according to claim 1 or 2, characterized in that the base is configured to have a continuous upper surface.

4. The work vehicle according to claim 3, characterized in that the base is constructed by arranging a plurality of plate-shaped members side by side.

5. The base is fixed to the frame by fillet welding. The work vehicle according to claim 3, characterized in that the fillet welds are applied intermittently only to the side surface of the base facing the inside of the engine compartment.

6. Multiple tap seats are formed on the upper surface of the base for fixing the engine cover onto the base. The work vehicle according to claim 5, characterized in that substantially all of the fillet welds are performed in positions that overlap with the tap seat when viewed from the width direction of the base.

7. The base is further fixed to the frame by plug welding. The work vehicle according to claim 5, characterized in that the plug welds are applied at multiple positions that do not overlap with the fillet welds when viewed from the width direction of the base.

8. The work vehicle according to claim 3, characterized in that a sealant is filled over the entire area between the base and the frame from the side of the decorative groove.

9. The work vehicle according to claim 1, characterized in that at least one of the corner portion between the upper surface of the frame body and the surface extending from the outer edge of the upper surface of the frame body, and the corner portion between the flat portion and the surface extending from the outer edge of the flat portion is rounded.

10. The engine cover is provided with a support frame portion in which a member having a lip groove-shaped cross-section perpendicular to its own longitudinal direction is disposed such that the opening portion faces the interior of the engine compartment. The work vehicle according to claim 1, characterized in that a part of the components to be mounted on the vehicle body is fixed to the support frame portion.

11. The work vehicle according to claim 1, characterized in that the work equipment mounted on the frame body separately from the engine cover is a drilling device for drilling blast holes in a construction target such as rock.

12. The work vehicle according to claim 10, characterized in that the work equipment mounted separately from the engine cover on the frame body is a drilling device for drilling blast holes in a construction target such as rock, and the component fixed to the support frame is a dust collector for collecting blasting dust generated during drilling.

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