Hydraulic oil tank for work vehicle and work vehicle

Abstract

To provide a hydraulic oil tank for work vehicle that can improve strength and can be efficiently assembled, and a work vehicle.SOLUTION: A hydraulic oil tank 10 located on a dump truck 1 comprises: a left wall part 11 located on a left side; a right wall part 12 which faces the left wall part 11 and is located on a right side; a rear wall part 13 located on a rear side; a front wall part 14 which faces the rear wall part 13 and is located on a front side; a bottom 133 located on a lower side; a lid part 141 which faces the bottom 133 and is located on an upper side; a first rib 31 which is located across the left wall part 11, the rear wall part 13 and the right wall part 12 inside the hydraulic oil tank 10; and a second rib 32 which is located across the left wall part 11, the rear wall part 13 and the right wall part 12 inside the hydraulic oil tank 10.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to a hydraulic oil tank for a work vehicle and a work vehicle. [Background technology]

[0002] BACKGROUND ART There is known a pressure tank in which a reinforcing material is attached to the inner wall surface of the tank body by inserting a tenon portion of the reinforcing material into a mortise formed in the tank body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-135762 Summary of the Invention [Problem to be solved by the invention]

[0004] The hydraulic oil tanks of dump trucks, which are work vehicles, need to be reinforced to withstand the vibrations caused by the dump truck's travel and the weight of the hydraulic oil inside the tank. It is also desirable to assemble the hydraulic oil tanks efficiently.

[0005] An object of an aspect of the present invention is to provide a hydraulic oil tank for a work vehicle, which has improved strength and can be efficiently assembled, and a work vehicle. [Means for solving the problem]

[0006] According to the present disclosure, there is provided a hydraulic oil tank for a work vehicle that is disposed on a work vehicle, the hydraulic oil tank comprising: a left wall portion disposed on the left, a right wall portion facing the left wall portion and disposed on the right, a rear wall portion disposed at the rear, a front wall portion facing the rear wall portion and disposed at the front, a bottom portion disposed below, a lid portion facing the bottom portion and disposed above, a first rib disposed inside the hydraulic oil tank for a work vehicle, spanning the left wall portion, the rear wall portion, and the right wall portion, and a second rib disposed inside the hydraulic oil tank for a work vehicle, spanning the left wall portion, the rear wall portion, and the right wall portion.

[0007] According to the present disclosure, there is provided a work vehicle including the above-described hydraulic oil tank for a work vehicle, a vehicle body, and a traveling device. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a hydraulic oil tank for a work vehicle and a work vehicle that have improved strength and can be efficiently assembled. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic view of a dump truck according to an embodiment, as viewed from the left front. [Figure 2] FIG. 2 is a perspective view of the hydraulic oil tank according to the embodiment, as seen from the left front. [Figure 3] FIG. 3 is a perspective view of the hydraulic oil tank according to the embodiment, as viewed from the left rear. [Figure 4] FIG. 4 is a plan view of the hydraulic oil tank according to the embodiment as viewed from above. [Figure 5] FIG. 5 is a front view of the left wall of the hydraulic oil tank according to the embodiment. [Figure 6] FIG. 6 is a front view of the right wall of the hydraulic oil tank according to the embodiment. [Figure 7] FIG. 7 is a perspective view of the rear and lower wall portions of the hydraulic oil tank according to the embodiment, as viewed from the left front. [Figure 8]FIG. 8 is a perspective view of the front and upper wall portions of the hydraulic oil tank according to the embodiment, as viewed from the left rear. [Figure 9] FIG. 9 is a plan view of a first rib of the hydraulic oil tank according to the embodiment. [Figure 10] FIG. 10 is a plan view of the second rib of the hydraulic oil tank according to the embodiment. [Figure 11] FIG. 11 is a schematic exploded perspective view of the hydraulic oil tank according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0011] (Embodiment) [Work vehicle] 1 is a schematic diagram of a dump truck according to an embodiment, viewed from the left front. The work vehicle 1 is a dump truck that transports loads such as earth and sand, crushed stone, etc. at a mining site, for example. In the following description, the work vehicle 1 will be referred to as a dump truck 1. In this embodiment, the dump truck 1 is a manned dump truck operated by an operator seated in a cab 8, but is not limited to this.

[0012] In this embodiment, the direction in which the driver's cab 8 is located relative to the vessel 3 of the dump truck 1 is defined as the front, and the direction in which the vessel 3 is located relative to the driver's cab 8 is defined as the rear. The width direction of the vehicle body 2 of the dump truck 1 is defined as the left-right direction. The right-hand side when the operator of the dump truck 1 is facing forward is defined as the right side, and the left-hand side is defined as the left side. The direction in which the vehicle body 2 or vessel 3 is located relative to the contact surface where the wheels 6 of the dump truck 1 contact the ground is defined as the up direction, and the direction from the vehicle body 2 or vessel 3 toward the contact surface, i.e., the direction of gravity, is defined as the down direction.

[0013] The dump truck 1 includes a vehicle body 2 and a vessel 3 mounted on the vehicle body 2 and on which a load is to be loaded. The vehicle body 2 includes a traveling device 4 (not shown) and a vehicle body 5 supported by the traveling device 4. The traveling device 4 includes wheels 6 and axles 7 that rotatably support the wheels 6. The wheels 6 include front wheels 6F and rear wheels 6R. The axles 7 include axles 7F that rotatably support the front wheels 6F and axles 7R that rotatably support the rear wheels 6R.

[0014] [Hydraulic oil tank] The hydraulic oil tank for a work vehicle (hereinafter referred to as the "hydraulic oil tank") 10 is a tank for hydraulic oil in the dump truck 1. The hydraulic oil tank 10 is located in front of the left front wheel 6F of the dump truck 1. The hydraulic oil tank 10 has a cross-sectional area in the vertical direction that is narrower at the bottom than at the top.

[0015] Fig. 2 is a perspective view of the hydraulic oil tank according to the embodiment, as seen from the front left. Fig. 3 is a perspective view of the hydraulic oil tank according to the embodiment, as seen from the rear left. Fig. 4 is a plan view of the hydraulic oil tank according to the embodiment, as seen from above. The hydraulic oil tank 10 is fixed to the body frame 9. More specifically, the front lower part of the hydraulic oil tank 10 is fixed to a bracket 91 extending leftward from the left side of the body frame 9 by a bracket 105 fixed to the hydraulic oil tank 10, fastening members 101 and 102. The rear upper part of the hydraulic oil tank 10 is fixed to a frame 9H extending upward from the left side of the body frame 9 by a bracket 92 fixed to the hydraulic oil tank 10 and fastening member 106. The fastening members 101, 102 and 106 are bolts.

[0016] The hydraulic oil tank 10 includes a left wall portion 11, a right wall portion 12, a rear wall portion 13, a front wall portion 14, a first rib 31, and a second rib 32. The left wall portion 11, the right wall portion 12, the rear wall portion 13, and the front wall portion 14 form the hydraulic oil tank 10 in a box shape.

[0017] FIG. 5 is a front view of the left wall of the hydraulic tank according to the embodiment. The left wall 11 is the left wall of the hydraulic tank 10. The left wall 11 is a polygonal plate. The left wall 11 has a polygonal shape whose outer shape is defined by sides 11a, 11b, 11c, 11d, 11e, and 11f. Side 11a is composed of sides 11a1, 11a2, and 11a3. Side 11a1 extends in a direction parallel to the front-to-rear direction. Side 11a1 corresponds to the bottom side of the left wall 11. Side 11a2 extends downward from the rear end of side 11a1. Side 11a3 extends rearward from the lower end of side 11a2. Side 11a3 extends in a direction parallel to the front-to-rear direction. The lower end of side 11c is connected to the rear end of side 11a3. Side 11b is arranged opposite side 11a. Side 11b extends in a direction parallel to the front-to-rear direction. Side 11b is longer than side 11a. The front end of side 11b is located rearward of the front end of side 11a. The rear end of side 11b is located rearward of the rear end of side 11a. Side 11c extends diagonally rearward and upward from the rear end of side 11a3. The inclination of side 11c is the same as the inclination of the wall portion 5T located in front of the left front wheel 6F of the body 5 of the dump truck 1. The lower end of side 11d is connected to the upper end of side 11c. Side 11d extends upward from the upper end of side 11c. The rear end of side 11b is connected to the upper end of side 11d. Side 11e extends upward from the front end of side 11a1. The lower end of side 11f is connected to the upper end of side 11e. Side 11f extends diagonally upward and rearward from the upper end of side 11e. The front end of side 11b is connected to the upper end of side 11f.

[0018] An opening 11S1 and an opening 11S2 are arranged in the left wall portion 11. The opening 11S1 is provided for inserting and removing an outlet filter 52 arranged in the hydraulic oil tank 10. A lid 55 is removably attached to the opening 11S1. An oil gauge 54 is removably attached to the opening 11S2.

[0019] The left wall portion 11 is provided with a first groove 21 to which the first rib 31 is attached and a second groove 22 to which the second rib 32 is attached.

[0020] A plurality of first grooves 21 are arranged. The first grooves 21 are tenon grooves. The first grooves 21 are arranged at positions that avoid the opening 11S2. The number of first grooves 21 is not limited, but in this embodiment, as an example, there are four first grooves 21. In this embodiment, the first grooves 21 include a first groove 211, a first groove 212, a first groove 213, and a first groove 214. The first grooves 211, the first groove 212, the first groove 213, and the first groove 214 are arranged at intervals on a straight line L1. The straight line L1 is perpendicular to the side 11c.

[0021] The second groove 22 is arranged below the first groove 21. The second groove 22 is a tenon groove. A plurality of second grooves 22 are arranged. The number of second grooves 22 is not limited, but in this embodiment, as an example, three is used. In this embodiment, the second grooves 22 include second groove 221, second groove 222, and second groove 223. Second groove 221, second groove 222, and second groove 223 are arranged at intervals on a straight line L2. The straight line L2 is parallel to the straight line L1. The straight line L2 is perpendicular to side 11c.

[0022] FIG. 6 is a front view of the right wall of the hydraulic tank according to the embodiment. The right wall 12 is the right side wall of the hydraulic tank 10. The right wall 12 is disposed opposite the left wall 11, spaced apart in the left-right direction. The right wall 12 is a polygonal plate. The right wall 12 has a polygonal shape whose outer shape is defined by sides 12a, 12b, 12c, 12d, 12e, and 12f. Side 12a extends in a direction parallel to the front-rear direction. Side 12a corresponds to the bottom side of the right wall 12. The lower end of side 12c is connected to the rear end of side 12a. Side 12b is disposed opposite side 12a. Side 12b extends in a direction parallel to the front-rear direction. Side 12b is longer than side 12a. The front end of side 12b is located rearward of the front end of side 12a. The rear end of side 12b is located rearward of the rear end of side 12a. Side 12c extends diagonally upward and rearward from the rear end of side 12a. The inclination of side 12c is the same as the inclination of the wall portion 5T located in front of the left front wheel 6F of the body 5 of the dump truck 1. The lower end of side 12d is connected to the upper end of side 12c. Side 12d extends upward from the upper end of side 12c. The rear end of side 12b is connected to the upper end of side 12d. Side 12e extends upward from the front end of side 12a. The lower end of side 12f is connected to the upper end of side 12e. Side 12f extends diagonally upward and rearward from the upper end of side 12e. The upper end of side 12f is connected to the front end of side 12b.

[0023] Openings 12S1, 12S2, 12S3, 12S4, and 12S5 are arranged on the right wall 12. An outlet filter is attached to opening 12S1. Various pipes connected to the hydraulic oil tank 10 are attached to openings 12S2, 12S3, 12S4, and 12S5.

[0024] The right wall portion 12 is provided with a first groove 23 to which the first rib 31 is attached and a second groove 24 to which the second rib 32 is attached.

[0025] A plurality of first grooves 23 are arranged. The number of first grooves 23 is not limited, but in this embodiment, as an example, it is four. In this embodiment, the first grooves 23 include a first groove 231, a first groove 232, a first groove 233, and a first groove 234. The first grooves 231, the first groove 232, the first groove 233, and the first groove 234 are arranged at intervals on a straight line L3. The straight line L3 is perpendicular to the side 12c.

[0026] The second groove 24 is disposed below the first groove 23. A plurality of second grooves 24 are disposed. The number of second grooves 24 is not limited, but in this embodiment, as an example, two is used. In this embodiment, the second grooves 24 include a second groove 241 and a second groove 242. The second grooves 241 and 242 are disposed on a straight line L4 with a gap therebetween. The straight line L4 is parallel to the straight line L3. The straight line L4 is perpendicular to the side 12c.

[0027] The rear wall portion 13 is the rear wall portion and bottom portion of the hydraulic oil tank 10. The rear wall portion 13 is formed by bending a single rectangular plate material. The rear wall portion 13 is bent at bent portion 13m and bent portion 13n. The rear wall portion 13 comprises an upper rear wall portion 131, a lower rear wall portion 132, and a bottom portion 133. The upper rear wall portion 131 and the lower rear wall portion 132 form the rear side wall of the hydraulic oil tank 10. The bottom portion 133 is the bottom of the hydraulic oil tank 10. The upper rear wall portion 131 is above bent portion 13m, and the lower rear wall portion 132 is above bent portion 13n. The bottom portion 133 is forward of bent portion 13n.

[0028] 7 is a perspective view of the rear and lower walls of the hydraulic tank according to the embodiment, as viewed from the left front. The outer shape of the rear wall 13 is defined by sides 13a1, 13a2, 13a3, 13b, 13c1, 13c2, 13d1, and 13d2. The sides 13a1 and 13a2 extend in a direction parallel to the front-rear direction. The sides 13a1 and 13a2 are arranged parallel to each other and spaced apart in the left-right direction. The left end of the side 13a3 is connected to the front end of the side 13a1. The right end of the side 13a3 is connected to the front end of the side 13a2. The side 13a3 extends in a direction parallel to the left-right direction. The side 13c1 is connected to the rear end of the side 13a1. The side 13c2 is connected to the rear end of the side 13a2. The sides 13c1 and 13c2 are arranged parallel to each other and spaced apart in the left-right direction. The side 13c1 extends diagonally upward and rearward from the rear end of the side 13a1. The side 13c2 extends diagonally upward and rearward from the rear end of the side 13a2. The inclination of the sides 13c1 and 13c2 is the same as the inclination of the wall portion 5T located in front of the left front wheel 6F of the body 5 of the dump truck 1. The lower end of the side 13d1 is connected to the upper end of the side 13c1. The lower end of the side 13d2 is connected to the upper end of the side 13c2. The sides 13d1 and 13d2 are arranged parallel to each other and spaced apart in the left-right direction. The side 13d1 extends upward from the upper end of the side 13c1. The side 13d2 extends upward from the upper end of the side 13c2. The left end of side 13b is connected to the upper end of side 13d1. The right end of side 13b is connected to the upper end of side 13d2. Side 13b extends in a direction parallel to the left-right direction.

[0029] The upper rear wall portion 131 has a rectangular shape whose outer shape is defined by the sides 13d1, 13b, 13d2, and the bent portion 13m. The upper rear wall portion 131 is disposed in a plane perpendicular to the ground contact surface of the wheels 6 of the dump truck 1.

[0030] The lower rear wall portion 132 has a rectangular shape whose outer shape is defined by side 13c1, side 13c2, bent portion 13m, and bent portion 13n. The lower rear wall portion 132 is arranged with a rearward-rising slope that slopes from bottom to top as it moves from the front to the rear with respect to the contact surface of the wheels 6 of the dump truck 1. The slope of the lower rear wall portion 132 is the same as the slope of the wall portion 5T of the body 5 of the dump truck 1 that is located in front of the left front wheel 6F.

[0031] The lower rear wall portion 132 is provided with a first groove 25 for attaching the first rib 31 and a second groove 26 for attaching the second rib 32.

[0032] A plurality of first grooves 25 are arranged. The number of first grooves 25 is not limited, but in this embodiment, as an example, it is four. In this embodiment, the first grooves 25 include a first groove 251, a first groove 252, a first groove 253, and a first groove 254. The first grooves 251, 252, 253, and 254 are arranged at intervals on a straight line L5. The straight line L5 is perpendicular to the side 13c1 and the side 13c2.

[0033] The second groove 26 is disposed below the first groove 25. A plurality of second grooves 26 are disposed. The number of second grooves 26 is not limited, but in this embodiment, as an example, three is used. In this embodiment, the second grooves 26 include a second groove 265, a second groove 262, and a second groove 263. The second grooves 265, the second groove 262, and the second groove 263 are disposed on a straight line L6 with a gap therebetween. The straight line L6 is parallel to the straight line L5. The straight line L6 is perpendicular to the sides 13c1 and 13c2.

[0034] An opening 13S2 is arranged in the lower rear wall portion 132. Various pipes connected to the hydraulic oil tank 10 are attached to the opening 13S2.

[0035] The bottom portion 133 has a rectangular shape whose outer shape is defined by the sides 13a1, 13a2, 13a3, and the bent portion 13n. The bottom portion 133 is disposed in a plane parallel to the ground contact surface of the wheels 6 of the dump truck 1.

[0036] An opening 13S1 is arranged in the bottom portion 133. Various pipes connected to the hydraulic oil tank 10 are attached to the opening 13S1.

[0037] FIG. 8 is a perspective view of the front and upper walls of the hydraulic tank according to the embodiment, as viewed from the left rear. The front wall 14 is the front wall and lid of the hydraulic tank 10. The front wall 14 is formed by bending a single rectangular plate. The front wall 14 is bent at bent portions 14m and 14n. The front wall 14 includes a lid 141, an upper front wall 142, and a lower front wall 143. The upper front wall 142 and the lower front wall 143 form the front wall of the hydraulic tank 10. The lid 141 is the lid of the hydraulic tank 10. The portion rearward of bent portion 14m is the lid 141, and the portion below bent portion 14m is the upper front wall 142. The portion below bent portion 14n is the lower front wall 143.

[0038] The outer shape of the front wall portion 14 is defined by sides 14a, 14b1, 14b2, 14b3, 14e1, 14e2, 14f1, and 14f2. Side 14a extends in a direction parallel to the left-right direction. The lower end of side 14e1 is connected to the left end of side 14a. The lower end of side 14e2 is connected to the right end of side 14a. Sides 14e1 and 14e2 are arranged parallel to each other and spaced apart in the left-right direction. Side 14e1 extends upward from the left end of side 14a. Side 14e2 extends upward from the right end of side 14a. The lower end of side 14f1 is connected to the upper end of side 14e1. The lower end of side 14f2 is connected to the upper end of side 14e2. Sides 14f1 and 14f2 are arranged parallel to each other and spaced apart in the left-right direction. Side 14f1 extends rearward and upward from the upper end of side 14e1. Side 14f2 extends rearward and upward from the upper end of side 14e2. The front end of side 14b1 is connected to the upper end of side 14f1. The front end of side 14b2 is connected to the upper end of side 14f2. Sides 14b1 and 14b2 are arranged parallel to each other and spaced apart in the left-right direction. Side 14b1 extends rearward from the upper end of side 14f1. Side 14b2 extends rearward from the upper end of side 14f2. Side 14b3 extends in a direction parallel to the left-right direction.

[0039] The cover portion 141 has a rectangular shape whose outer shape is defined by sides 14b1, 14b2, 14ba3, and the bent portion 14m. The cover portion 141 is disposed in a plane parallel to the ground contact surface of the wheels 6 of the dump truck 1.

[0040] An opening 14S1 and an opening 14S2 are arranged in the lid portion 141. An inlet filter 51 is attached to the opening 14S1. A fuel filler port 53 is attached to the opening 14S2.

[0041] The upper front wall portion 142 has a rectangular shape whose outer shape is defined by a side 14f1, a side 14f2, a bent portion 14m, and a bent portion 14n. The upper front wall portion 142 is disposed so as to slope upward from the bottom to the top as it goes from the front to the rear with respect to the contact surface of the wheels 6 of the dump truck 1.

[0042] The lower front wall portion 143 has a rectangular shape whose outer shape is defined by the side 14a, the side 14e1, the side 14e2, and the bent portion 14n. The lower front wall portion 143 is disposed in a plane perpendicular to the contact surface of the wheels 6 of the dump truck 1.

[0043] 11 is a schematic exploded perspective view of the hydraulic oil tank according to the embodiment. The hydraulic oil tank 10 is formed into a box shape by the left wall portion 11, the right wall portion 12, the rear wall portion 13, and the front wall portion 14 configured as described above.

[0044] The peripheral edge of left wall 11 is joined to the peripheral edge of rear wall 13. More specifically, side 11a1 is joined to side 13a1, side 11c is joined to side 13c1, and side 11d is joined to side 13d1.

[0045] The peripheral edge of the left wall 11 is joined to the peripheral edge of the front wall 14. More specifically, the side 11e is joined to the side 14e1, the side 11f is joined to the side 14f1, and the side 11b is joined to the side 14b1.

[0046] The peripheral edge of the right wall portion 12 is joined to the peripheral edge of the rear wall portion 13. More specifically, the side 12a is joined to the side 13a2, the side 12c is joined to the side 13c2, and the side 12d is joined to the side 13d2.

[0047] The peripheral edge of the right wall portion 12 is joined to the peripheral edge of the front wall portion 14. More specifically, the side 12e is joined to the side 14e2, the side 12f is joined to the side 14f2, and the side 12b is joined to the side 14b2.

[0048] The peripheral edge of the rear wall portion 13 is joined to the peripheral edge of the front wall portion 14. More specifically, the side 13a3 is joined to the side 14a, and the side 13b is joined to the side 14b3.

[0049] Fig. 9 is a plan view of a first rib of the hydraulic oil tank according to the embodiment. Fig. 10 is a plan view of a second rib of the hydraulic oil tank according to the embodiment. The first rib 31 and the second rib 32 are ribs that reinforce the hydraulic oil tank 10. The first rib 31 and the second rib 32 have a U-shape in plan view. The first rib 31 and the second rib 32 are arranged inside the hydraulic oil tank 10. The first rib 31 and the second rib 32 are attached across three walls of the hydraulic oil tank 10: the left wall, rear wall, and right wall. By attaching the first rib 31 and the second rib 32, the left wall, rear wall, and right wall of the hydraulic oil tank 10 are maintained in an assembled shape.

[0050] As shown in FIG. 9 , the first rib 31 includes a left rib 311, a rear rib 312, and a right rib 313. The left rib 311, the rear rib 312, and the right rib 313 are integrally formed. One end of the left rib 311 is connected to one end of the rear rib 312. The other end of the rear rib 312 is connected to one end of the right rib 313. The left rib 311 and the right rib 313 extend in directions perpendicular to the rear rib 312. The left rib 311 reinforces the left wall portion 11. The rear rib 312 reinforces the rear wall portion 132 below the rear wall portion 13. The right rib 313 reinforces the right wall portion 12.

[0051] The left rib 311 has a plurality of protrusions 314 arranged thereon. The number of protrusions 314 is not limited, but in this embodiment, as an example, it is four. In this embodiment, the protrusions 314 include a protrusion 3141, a protrusion 3142, a protrusion 3143, and a protrusion 3144. The protrusions 3141, the protrusion 3142, the protrusion 3143, and the protrusion 3144 are arranged at intervals corresponding to the first grooves 211, 212, 213, and 214. The protrusions 3141 engage with the first groove 211. The protrusion 3142 engages with the first groove 212. The protrusion 3143 engages with the first groove 213. The protrusion 3144 engages with the first groove 214.

[0052] The rear rib 312 has a plurality of protrusions 316 arranged thereon. The number of protrusions 316 is not limited, but in this embodiment, for example, four. In this embodiment, the protrusions 316 include a protrusion 3161, a protrusion 3162, a protrusion 3163, and a protrusion 3164. The protrusions 3161, the protrusion 3162, the protrusion 3163, and the protrusion 3164 are arranged at intervals corresponding to the first grooves 251, 252, 253, and 254. The protrusions 3161 engage with the first groove 251. The protrusion 3162 engages with the first groove 252. The protrusion 3163 engages with the first groove 253. The protrusion 3164 engages with the first groove 254.

[0053] The right rib 313 has a plurality of protrusions 315 arranged thereon. The number of protrusions 315 is not limited, but in this embodiment, for example, four. In this embodiment, the protrusions 315 include a protrusion 3151, a protrusion 3152, a protrusion 3153, and a protrusion 3154. The protrusions 3151, the protrusion 3152, the protrusion 3153, and the protrusion 3154 are arranged at intervals corresponding to the first grooves 231, 232, 233, and 234. The protrusions 3151 engage with the first groove 231. The protrusion 3152 engages with the first groove 232. The protrusion 3153 engages with the first groove 233. The protrusion 3154 engages with the first groove 234.

[0054] As shown in FIG. 10 , the second rib 32 includes a left rib 321, a rear rib 322, and a right rib 323. The left rib 321, the rear rib 322, and the right rib 323 are integrally formed. One end of the left rib 321 is connected to one end of the rear rib 322. The other end of the rear rib 322 is connected to one end of the right rib 323. The left rib 321 and the right rib 323 extend in directions perpendicular to the rear rib 322. The left rib 321 reinforces the left wall portion 11. The rear rib 322 reinforces the rear wall portion 132 below the rear wall portion 13. The right rib 323 reinforces the right wall portion 12.

[0055] The left rib 321 has a plurality of protrusions 324 arranged thereon. The number of protrusions 324 is not limited, but in this embodiment, it is assumed to be three, for example. In this embodiment, the protrusions 324 include a protrusion 3241, a protrusion 3242, and a protrusion 3243. The protrusions 3241, 3242, and 3243 are arranged at intervals corresponding to the second grooves 221, 222, and 223. The protrusions 3241 engage with the second groove 221. The protrusions 3242 engage with the second groove 222. The protrusions 3243 engage with the second groove 223.

[0056] The rear rib 322 has a plurality of protrusions 326 arranged thereon. The number of protrusions 326 is not limited, but in this embodiment, it is assumed to be three, for example. In this embodiment, the protrusions 326 include a protrusion 3261, a protrusion 3262, and a protrusion 3263. The protrusions 3261, 3262, and 3263 are arranged at intervals corresponding to the second grooves 261, 262, and 263. The protrusions 3261 engage with the second groove 261. The protrusions 3262 engage with the second groove 262. The protrusions 3263 engage with the second groove 263.

[0057] The right rib 323 has a plurality of protrusions 325 arranged thereon. The number of protrusions 325 is not limited, but in this embodiment, as an example, there are two. In this embodiment, the protrusions 325 include a protrusion 3251 and a protrusion 3252. The protrusions 3251 and 3252 are arranged at an interval corresponding to the second grooves 241 and 242. The protrusions 3251 engage with the second groove 241. The protrusions 3252 engage with the second groove 242.

[0058] 3, the reinforcing member 33 reinforces the lower rear wall portion 132 of the rear wall portion 13. The reinforcing member 33 is disposed below the second groove 26 of the lower rear wall portion 132. The reinforcing member 33 is fixed to the outer peripheral surface of the lower rear wall portion 132 with their surfaces in contact with each other.

[0059] [How to assemble the hydraulic oil tank] The assembly of the hydraulic oil tank will be described using Figure 11. For simplicity of explanation, Figure 11 shows only the left wall 11, right wall 12, rear wall 13, front wall 14, first rib 31, and second rib 32, and omits other members.

[0060] First, the left wall portion 11, the right wall portion 12, and the rear wall portion 13 are assembled to the first rib 31 and the second rib 32. The order in which the left wall portion 11, the right wall portion 12, and the rear wall portion 13 are assembled is not limited.

[0061] The first rib 31 is inserted into the first groove 21 of the left wall portion 11, and the second rib 32 is inserted into the second groove 22 of the left wall portion 11. More specifically, the convex portion 3141 is inserted into the first groove 211, the convex portion 3142 is inserted into the first groove 212, the convex portion 3143 is inserted into the first groove 213, and the convex portion 3144 is inserted into the first groove 214. The convex portion 3241 is inserted into the second groove 221, the convex portion 3242 is inserted into the second groove 222, and the convex portion 3243 is inserted into the second groove 223.

[0062] The first rib 31 is inserted into the first groove 23 of the right wall portion 12, and the second rib 32 is inserted into the second groove 24 of the right wall portion 12. More specifically, the convex portion 3151 is inserted into the first groove 231, the convex portion 3152 is inserted into the first groove 232, the convex portion 3153 is inserted into the first groove 233, and the convex portion 3154 is inserted into the first groove 234. The convex portion 3251 is inserted into the second groove 241, and the convex portion 3252 is inserted into the second groove 242.

[0063] The first rib 31 is inserted into the first groove 25 of the rear wall portion 13, and the second rib 32 is inserted into the second groove 26 of the rear wall portion 13. More specifically, the convex portion 3161 is inserted into the first groove 251, the convex portion 3162 is inserted into the first groove 252, the convex portion 3163 is inserted into the first groove 253, and the convex portion 3164 is inserted into the first groove 254. The convex portion 3261 is inserted into the second groove 261, the convex portion 3262 is inserted into the second groove 262, and the convex portion 3263 is inserted into the second groove 263.

[0064] In this way, with the left wall portion 11, right wall portion 12 and rear wall portion 13 assembled to the first rib 31 and the second rib 32, the first rib 31 and the second rib 32 are welded to the left wall portion 11, right wall portion 12 and rear wall portion 13 from the outside of the hydraulic oil tank 10.

[0065] The left wall portion 11, the right wall portion 12, and the rear wall portion 13 are integrated with the first rib 31 and the second rib 32. The front wall portion 14 is assembled so as to cover the openings of the left wall portion 11, the right wall portion 12, and the rear wall portion 13.

[0066] The peripheral edge of the left wall 11 is brought into contact with the peripheral edge of the rear wall 13. More specifically, side 11a1 is brought into contact with side 13a1, side 11c is brought into contact with side 13c1, and side 11d is brought into contact with side 13d1. With the peripheral edge of the left wall 11 and the peripheral edge of the rear wall 13 in contact with each other, they are welded from the outside of the hydraulic oil tank 10.

[0067] The peripheral edge of the left wall 11 is brought into contact with the peripheral edge of the front wall 14. More specifically, side 11e is brought into contact with side 14e1, side 11f is brought into contact with side 14f1, and side 11b is brought into contact with side 14b1. With the peripheral edge of the left wall 11 and the peripheral edge of the front wall 14 in contact with each other, they are welded from the outside of the hydraulic oil tank 10.

[0068] The peripheral edge of the right wall 12 is brought into contact with the peripheral edge of the rear wall 13. More specifically, side 12a is brought into contact with side 13a2, side 12c is brought into contact with side 13c2, and side 12d is brought into contact with side 13d2. With the peripheral edge of the right wall 12 and the peripheral edge of the rear wall 13 in contact with each other, they are welded from the outside of the hydraulic oil tank 10.

[0069] The peripheral edge of the right wall 12 is brought into contact with the peripheral edge of the front wall 14. More specifically, side 12e is brought into contact with side 14e2, side 12f is brought into contact with side 14f2, and side 12b is brought into contact with side 14b2. With the peripheral edge of the right wall 12 and the peripheral edge of the front wall 14 in contact with each other, they are welded from the outside of the hydraulic oil tank 10.

[0070] The peripheral edge of the rear wall 13 is brought into contact with the peripheral edge of the front wall 14. More specifically, the side 13a3 is brought into contact with the side 14a, and the side 13b is brought into contact with the side 14b3. With the peripheral edge of the rear wall 13 and the peripheral edge of the front wall 14 in contact with each other, they are welded from the outside of the hydraulic oil tank 10.

[0071] The order of welding the first rib 31 and the second rib 32 to the left wall portion 11, the right wall portion 12 and the rear wall portion 13, and the welding of the peripheral portions of the left wall portion 11, the right wall portion 12, the rear wall portion 13 and the front wall portion 14 is not limited.

[0072] [effect] As described above, in this embodiment, the hydraulic tank 10 is provided with the first rib 31 and the second rib 32 arranged across the left wall 11, the rear wall 13, and the right wall 12 inside the hydraulic tank 10. According to this embodiment, strength is improved and assembly can be performed efficiently.

[0073] In this embodiment, the left wall portion 11, the rear wall portion 13, and the right wall portion 12 are respectively provided with first grooves 21, 23, and 25 that engage with the convex portions 314, 315, and 316 of the first rib 31, and second grooves 22, 24, and 26 that engage with the convex portions 324, 325, and 326 of the second rib 32. According to this embodiment, the left wall portion 11, the right wall portion 12, and the rear wall portion 13 can be positioned by inserting the tenon grooves of the left wall portion 11, the right wall portion 12, and the rear wall portion 13 into the convex portions of the first rib 31 and the second rib 32. According to this embodiment, efficient assembly is possible.

[0074] According to this embodiment, the tenon grooves of the left wall portion 11, the right wall portion 12, and the rear wall portion 13 can be inserted into the protruding portions of the first rib 31 and the second rib 32, and the ribs can be welded from the outside of the hydraulic oil tank 10. According to this embodiment, the assembly process of the hydraulic oil tank 10 can be made more efficient.

[0075] In this embodiment, the first rib 31 and the second rib 32 have a U-shaped planar shape and are attached across three walls of the hydraulic oil tank 10: the left wall 11, the rear wall 13, and the right wall 12. According to this embodiment, the first rib 31 and the second rib 32 can reinforce the hydraulic oil tank 10.

[0076] In this embodiment, the first rib 31 is formed by a left rib 311, a rear rib 312, and a right rib 313, and the second rib 32 is formed by a left rib 321, a rear rib 322, and a right rib 323. According to this embodiment, the hydraulic oil tank 10 can be reinforced.

[0077] In this embodiment, the left wall portion 11 and the right wall portion 12 have a width in the front-rear direction that is narrower at the bottom than at the top. According to this embodiment, the left wall portion 11 and the right wall portion 12 can be appropriately arranged on the dump truck 1.

[0078] In this embodiment, the inclination of the sides 11c and 12c of the left wall portion 11 and the right wall portion 12 that are joined to the rear wall portion 13 is the same as the inclination of the wall portion that is located in front of the left front wheel 6F of the body 5 of the dump truck 1. According to this embodiment, the left wall portion 11 and the right wall portion 12 can be appropriately disposed in front of the front wheel 6F of the dump truck 1.

[0079] In this embodiment, the left rib 311 of the first rib 31 and the left rib 321 of the second rib 32 are perpendicular to the side 11c of the left wall portion 11. In this embodiment, the right rib 313 of the first rib 31 and the right rib 323 of the second rib 32 are perpendicular to the side 12c of the right wall portion 12. According to this embodiment, the hydraulic oil tank 10 can be appropriately reinforced.

[0080] In this embodiment, the lower rear wall portion 132 and the bottom portion 133 are connected via a bent portion 13n, and the upper front wall portion 142 and the lid portion 141 are connected via a bent portion 14m.

[0081] In this embodiment, the hydraulic oil tank 10 is disposed in front of the left front wheel 6F of the dump truck 1. According to this embodiment, the hydraulic oil tank 10 can be disposed near the pump of the dump truck 1. According to this embodiment, the suction piping from the hydraulic oil tank 10 of the dump truck 1 to the pump can be shortened. [Explanation of symbols]

[0082] 1...dump truck (work vehicle), 2...vehicle body, 3...vessel, 4...traveling gear, 5...vehicle body, 6...wheel, 7...axle, 9...vehicle frame, 10...hydraulic oil tank, 11...left wall portion, 12...right wall portion, 13...rear wall portion, 13m...bent portion, 13n...bent portion, 131...upper rear wall portion, 132...lower rear wall portion, 133...bottom, 14...front wall portion, 14m...bent portion, 14n...bent portion, 141...lid portion, 142...upper front wall portion, 143...lower front wall portion , 21...first groove, 211...first groove, 212...first groove, 213...first groove, 214...first groove, 22...second groove, 221...second groove, 222...second groove, 23...first groove, 231...first groove, 232...first groove, 233...first groove, 234...first groove, 24...second groove, 241...second groove, 242...second groove, 25...first groove, 251...first groove, 252...first groove, 253...first groove, 254...first groove, 26...second groove, 261...second groove, 262...second groove, 26 3...second groove, 31...first rib, 311...left rib, 312...rear rib, 313...right rib, 314...convex portion, 3141...convex portion, 3142...convex portion, 3143...convex portion, 3144...convex portion, 315...convex portion, 3151...convex portion, 3152...convex portion, 3153...convex portion, 3154...convex portion, 316...convex portion, 3161...convex portion, 3162...convex portion, 3163...convex portion, 3164...convex portion, 32...second rib, 321...left rib, 322...rear rib, 323...right rib, 32 4...convex portion, 3241...convex portion, 3242...convex portion, 3243...convex portion, 325...convex portion, 3251...convex portion, 3252...convex portion, 326...convex portion, 3261...convex portion, 3262...convex portion, 3263...convex portion, 33...reinforcing member, 51...inlet filter, 52...outlet filter, 53...oil filler cap, 54...oil gauge, 55...lid, 91...bracket, 92...bracket, 101...fastening member, 102...fastening member, 105...bracket, 106...fastening member.

Claims

1. A hydraulic oil tank for a work vehicle disposed on a work vehicle, a left wall portion disposed on the left side; a right wall portion disposed to the right of and facing the left wall portion; a rear wall portion disposed at the rear; a front wall portion facing the rear wall portion and disposed forward; a bottom portion disposed below; a lid portion disposed above and facing the bottom portion; a first rib disposed inside the hydraulic oil tank for a work vehicle, straddling the left wall portion, the rear wall portion, and the right wall portion; a second rib disposed inside the hydraulic oil tank for a work vehicle, straddling the left wall portion, the rear wall portion, and the right wall portion; A hydraulic oil tank for a work vehicle.

2. The left wall portion, the rear wall portion, and the right wall portion are each provided with a first groove with which the convex portion of the first rib engages and a second groove with which the convex portion of the second rib engages. The hydraulic oil tank for a work vehicle according to claim 1.

3. The first rib and the second rib have a U-shaped planar shape. The hydraulic oil tank for a work vehicle according to claim 1.

4. The first rib and the second rib are each formed of a left rib arranged along the left wall portion, a rear rib arranged along the rear wall portion, and a right rib arranged along the right wall portion, and a rear end portion of the left rib is connected to a left end portion of the rear rib, and a rear end portion of the right rib is connected to a right end portion of the rear rib. The hydraulic oil tank for a work vehicle according to claim 3.

5. The left wall portion and the right wall portion have a width in the front-rear direction that is narrower at the bottom than at the top. The hydraulic oil tank for a work vehicle according to claim 1.

6. The inclination of the sides of the left wall portion and the right wall portion that are joined to the rear wall portion is the same as the inclination of a wall portion that is located in front of the left front wheel of the body of the work vehicle. The hydraulic oil tank for a work vehicle according to claim 1.

7. the left rib of the first rib and the left rib of the second rib are perpendicular to a side of the left wall portion that is joined to the rear wall portion, The right rib of the first rib and the right rib of the second rib are perpendicular to a side of the right wall portion that is joined to the rear wall portion. The hydraulic oil tank for a work vehicle according to claim 4.

8. the rear wall portion and the bottom portion are connected via a bent portion, The front wall portion and the lid portion are connected via a bent portion. The hydraulic oil tank for a work vehicle according to claim 1.

9. A hydraulic oil tank for a work vehicle according to any one of claims 1 to 8; The car body and Running gear and A work vehicle equipped with

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