Work vehicle

Abstract

To achieve a tilt operation of a cab.SOLUTION: A work vehicle includes: an engine; a vehicle body frame on which the engine is mounted; a cab which is rotatably supported from a seating position to a tilt position inclined rearward and upward above the vehicle body frame; and a first post treatment device and a second post treatment device that treat exhaust gas discharged from an exhaust pipe of the engine. The first post treatment device and the second post treatment device are arranged side by side to be inclined rearward and upward on a rear side of the cab when viewed from a vehicle width direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a dump truck equipped with an engine, a cab floor that is positioned above the engine and supports the cab, a first after-treatment device that treats exhaust gas discharged from a first exhaust pipe of the engine, and a second after-treatment device that treats exhaust gas discharged from a second exhaust pipe of the engine. In this dump truck, the first and second after-treatment devices are arranged side by side in the vehicle width direction behind the engine and below the cab floor. Meanwhile, there is known a work vehicle in which the cab is disposed above the body frame and supported so that the cab can rotate from a seating position to a tilted position inclined rearward and upward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-129853 Summary of the Invention [Problem to be solved by the invention]

[0004] Due to installation space limitations, it may be difficult to install the first and second aftertreatment devices below the cab floor. If the first and second aftertreatment devices are installed behind the cab, depending on their positions, it may be impossible to tilt the cab.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a work vehicle that is capable of realizing tilting of the cab. [Means for solving the problem]

[0006] A work vehicle according to one embodiment of the present invention comprises an engine, a body frame on which the engine is mounted, a cab supported above the body frame so as to be rotatable from a seating position to a tilted position inclined rearward and upward, and first and second aftertreatment devices for treating exhaust gases emitted from the exhaust pipe of the engine, wherein, when viewed from the vehicle width direction, the first and second aftertreatment devices are arranged side by side behind the cab, inclined rearward and upward. [Effects of the Invention]

[0007] According to the above aspect, tilting of the cab can be realized. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a right side view of the work vehicle according to the embodiment. [Figure 2] FIG. 4 is a diagram illustrating a state in which the cab according to the embodiment is rotated. [Figure 3] FIG. 2 is a perspective view of the arrangement of the exhaust pipes of the engine according to the embodiment, as viewed from the right front. [Figure 4] FIG. 2 is a top view showing the arrangement of exhaust pipes of the engine according to the embodiment. [Figure 5] FIG. 2 is a right side view showing the arrangement of an exhaust pipe of the engine according to the embodiment. [Figure 6] FIG. 2 is a perspective view of the exhaust pipe arrangement of the engine according to the embodiment, seen from the right rear. [Figure 7] FIG. 10 is a perspective view of the connecting portion of the mount member according to the embodiment, as viewed from the right front. [Figure 8] FIG. 2 is a perspective view of the first and second post-processing devices mounted on the mounting members according to the embodiment, as viewed from the right front. [Figure 9] FIG. 10 is a perspective view of the first and second post-processing devices according to the embodiment removed from the mounting members, as viewed from the right front. [Figure 10] FIG. 10 is a perspective view of a portion of the mount member according to the embodiment to which the position adjustment member is attached, as viewed from the right rear. [Figure 11]FIG. 2 is a top view of the mounting member according to the embodiment. [Figure 12] FIG. 4 is a bottom view of the mount member according to the embodiment. [Figure 13] FIG. 2 is a front view of the mounting member according to the embodiment. [Figure 14] FIG. 4 is a rear view of the mount member according to the embodiment. [Figure 15] FIG. 4 is a left side view of the mount member according to the embodiment. [Figure 16] FIG. 4 is a right side view of the mount member according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, a dump truck will be described as an example of a work vehicle. In the embodiment, an articulated dump truck having a body frame composed of a front frame and a rear frame will be described.

[0010] In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," do not only mean such arrangements or states in the strict sense, but also include arrangements or states in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. In the drawings used in the following description, the scale of each component may be changed as appropriate to make each component recognizable.

[0011] <Work vehicle> FIG. 1 is a right side view of a work vehicle 1 according to an embodiment. As shown in FIG. 1, a work vehicle 1 (hereinafter also simply referred to as a “vehicle”) includes a front vehicle portion 10 and a rear vehicle portion 20.

[0012] Hereinafter, the forward direction and backward direction of the vehicle may be referred to as "front of the vehicle (one side in the fore-and-aft direction of the vehicle)" and "rear of the vehicle (the other side in the fore-and-aft direction of the vehicle)", respectively. The vehicle width direction includes "left side (one side in the fore-and-aft direction of the vehicle)" and "right side (the other side in the fore-and-aft direction of the vehicle)". The right side of the vehicle is the right side with respect to the forward direction of the vehicle, and the left side of the vehicle is the left side with respect to the forward direction of the vehicle. The vehicle up-and-down direction, above the vehicle, and below the vehicle may be referred to simply as "up-and-down direction", "above", and "below", respectively. In the illustrated example, the vehicle is placed on a horizontal plane. The vehicle up-and-down direction, above the vehicle, and below the vehicle correspond to the up-and-down direction (vertical direction), vertically above, and vertically below, respectively, when the vehicle is placed on a horizontal plane.

[0013] The front part 10 of the vehicle includes a front frame 11, front wheels 12, a hood 13, and a cab 14. A front frame 11 constitutes the frame of a front portion 10 of the vehicle. A hood 13 is attached to the front portion of the front frame 11 so as to be able to open and close. A cab 14 is provided above the front frame 11. The cab 14 is a ROPS (Roll Over Protective System) cab equipped with a safety structure to ensure the safety of the operator in the event of the vehicle tipping over.

[0014] The vehicle rear section 20 includes a rear frame 21, rear front wheels 22, and rear rear wheels 23. The rear frame 21 forms the frame of the vehicle rear section 20. The vehicle rear section 20 is provided behind the vehicle front section 10. The rear frame 21 is connected to the front frame 11 so as to be able to bend and swing freely. A pair of left and right steering cylinders 24 spans between the front frame 11 and the rear frame 21. By extending and retracting each of the steering cylinders 24, the rear frame 21 can bend relative to the front frame 11, enabling steering operation.

[0015] The rear portion 20 of the vehicle is equipped with a vessel 25 and a lift cylinder 26. The vessel 25 is provided above the rear frame 21. The vessel 25 carries cargo such as earth and sand. The lift cylinders 26 are provided between the left and right sides of the front portion of the vessel 25 and the rear frame 21. The lower rear side of the vessel 25 is rotatably attached to the rear frame 21. The vessel 25 rotates when the lift cylinders 26 extend and retract.

[0016] A pair of front wheels 12 are provided on the front frame 11 and spaced apart in the vehicle width direction. A pair of rear front wheels 22 are provided in front of the rear frame 21 and spaced apart in the vehicle width direction. A pair of rear rear wheels 23 are provided at the rear of the rear frame 21 and spaced apart in the vehicle width direction. The front wheels 12, rear front wheels 22, and rear rear wheels 23 are driven to move the vehicle forward or backward.

[0017] FIG. 2 is a diagram showing a state when the cab 14 according to the embodiment is rotated. 2, the cab 14 is fixedly supported on the front frame 11 via a pair of rear support structures 29B and is rotatable in the direction of the arrow TU (tilt-up direction) and the direction of the arrow TD (tilt-down direction). Various devices 15, such as a diesel engine (drive source), a torque converter, a transmission, and a hydraulic pump, are provided in the space below the hood 13 and the cab 14.

[0018] A front support structure 29A and a rear support structure 29B are provided between the cab 14 and the front frame 11 as cab support structures. A pair of front support structures 29A are provided between the front of the cab 14 and the front frame 11 and spaced apart in the vehicle width direction. A pair of rear support structures 29B are provided between the rear of the cab 14 and the front frame 11 and spaced apart in the vehicle width direction. Hereinafter, the initial position of the cab 14 before it rotates in the direction of the arrow TU will be referred to as the "seating position." Hereinafter, the position where the cab 14 is rotated a predetermined rotation angle in the direction of the arrow TU from the seating position will be referred to as the "tilt position." In the seating position of the cab 14, the front left and right sides and the rear left and right sides of the cab 14 are supported by the cab support devices 29A, 29B.

[0019] For example, when inspecting or servicing the various devices 15, the operator opens the hood 13 and further disassembles the front support structures 29A. For example, by removing the connecting shafts (not shown) from the front support structures 29A, it is possible to release the support state of the cab 14 by the mount devices on both the left and right front sides. After releasing the support state, the operator rotates the cab 14 in the direction of arrow TU by using an operating power source such as a hydraulic cylinder or a crane. This exposes the upper sides of the various devices 15. With the cab 14 rotated, the cab 14 is held at a predetermined rotation angle by inserting a support rod 28 between the cab 14 and the front frame 11.

[0020] The work vehicle 1 comprises an engine 2, a body frame 3 on which the engine 2 is mounted, a cab 14 supported above the body frame 3 so as to be rotatable from a seating position to a tilted position inclined rearward and upward, and a first after-treatment device 31 and a second after-treatment device 32 that treat exhaust gas emitted from an exhaust pipe 30 of the engine 2.

[0021] The first after-treatment device 31 and the second after-treatment device 32 perform processes such as collection and reduction of residual substances in the exhaust gas, such as particulate matter (hereinafter abbreviated as "PM") and NOx (nitrogen oxides).

[0022] When viewed from the vehicle width direction, the first after-treatment device 31 and the second after-treatment device 32 are arranged side by side behind the cab 14 and tilted rearward and upward. The first after-treatment device 31 is arranged below the upper surface of the cab 14 when it is in the seating position. In FIG. 2, the cab 14 when it is in the seating position is shown by a two-dot chain line. The first after-treatment device 31 and the second after-treatment device 32 are each arranged rearward of the cab 14 when it has rotated to the tilt position. The first after-treatment device 31 and the second after-treatment device 32 are each formed in a cylindrical shape that extends along the vehicle width direction.

[0023] Fig. 3 is a perspective view of the arrangement of the exhaust pipe 30 of the engine 2 according to the embodiment, as seen from the right front. Fig. 4 is a top view showing the arrangement of the exhaust pipe 30 of the engine 2 according to the embodiment. Fig. 5 is a right side view showing the arrangement of the exhaust pipe 30 of the engine 2 according to the embodiment. Fig. 6 is a perspective view of the arrangement of the exhaust pipe 30 of the engine 2 according to the embodiment, as seen from the right rear. 3 to 6, the engine 2 is disposed in front of and below the cab 14 at the center in the vehicle width direction.

[0024] In this embodiment, each of the first after-treatment device 31 and the second after-treatment device 32 is disposed on the center side in the vehicle width direction so as to fit within a range RW of ⅔ or less of the overall vehicle width VW. When the articulated vehicle body is bent, each of the first after-treatment device 31 and the second after-treatment device 32 is disposed on the inner side in the vehicle width direction than the bent portion.

[0025] In this embodiment, the first aftertreatment device 31 includes a diesel particulate filter (DPF) device 31A. The second aftertreatment device 32 includes an SCR device 32A that treats exhaust gas with a selective catalytic reduction catalyst. The SCR device 32A is disposed below the DPF device 31A.

[0026] The first aftertreatment device 31 is configured to include, for example, a diesel oxidation catalyst (hereinafter abbreviated as "DOC") device and a DPF that traps PM. The first aftertreatment device 31 traps PM with the DPF and oxidizes the trapped PM downstream to carbon dioxide using nitrogen dioxide converted by the DOC device, thereby removing the PM.

[0027] In this embodiment, a mixing pipe 33 is provided that connects the first aftertreatment device 31 and the second aftertreatment device 32 to each other. The mixing pipe 33 is connected to the outlet of the DPF device 31A and the inlet of the SCR device 32A. The mixing device includes a DEF injection device that injects diesel exhaust fluid (hereinafter abbreviated as "DEF") such as urea water. The urea water solution (DEF) injected in the mixing pipe 33 is hydrolyzed by the heat of the exhaust gas and becomes ammonia.

[0028] The SCR device 32A reduces and purifies nitrogen oxides in the exhaust gas by using ammonia, which is obtained by hydrolyzing a urea aqueous solution, as a reducing agent. For example, ammonia may be supplied as a reducing agent to the SCR device 32A together with the exhaust gas. An ammonia oxidation catalyst may be provided downstream of the SCR device 32A.

[0029] In this embodiment, the exhaust gas supply system further includes an outlet pipe 34 connected to the outlet of the SCR device 32A. The outlet pipe 34 is located on the center side in the vehicle width direction, behind the second aftertreatment device 32. When the articulated vehicle body is bent, the outlet pipe 34 is located on the inner side in the vehicle width direction than the bent portion.

[0030] In a top view, the exhaust pipe 30 extends rearward and to the right from the engine 2, then bends rearward and extends, and then bends rearward and extends toward the left toward the first aftertreatment device 31. In a right side view, the exhaust pipe 30 extends rearward and then extends at an angle rearward and upward toward the first aftertreatment device 31. Exhaust gas from the engine 2 is introduced into the DPF device 31A of the first aftertreatment device 31 through the exhaust pipe 30.

[0031] The mixing pipe 33 extends in the front-rear direction so as to connect the left ends of the first post-treatment device 31 and the second post-treatment device 32 in a top view. In a right side view, the mixing device extends downward and forward from the connecting portion with the first post-treatment device 31 toward the connecting portion with the second post-treatment device 32. In a right side view, the mixing device is formed in a curved shape so as to fit the outer shapes of the first post-treatment device 31 and the second post-treatment device 32.

[0032] The outlet pipe 34 extends rearward from the second aftertreatment device 32 in a top view. In a right side view, the outlet pipe 34 extends downward from the second aftertreatment device 32, and then extends while bending rearward and downward toward the front lower part of the vessel 25. Specifically, the outlet pipe 34 extends in a curved rearward direction from the rear right part of the second aftertreatment device 32 (the part where the outlet of the SCR device 32A is located) toward the center in the vehicle width direction, and then extends while bending rearward and downward (see FIG. 6).

[0033] Fig. 7 is a perspective view of the connecting portion of the mount member 40 according to the embodiment, as seen from the front right. Fig. 8 is a perspective view of the first post-processing device 31 and the second post-processing device 32 according to the embodiment mounted on the mount member 40, as seen from the front right. 7 and 8, this embodiment further includes a box-shaped mount member 40 on which each of the first post-processing device 31 and the second post-processing device 32 is mounted. Although not shown, the mount member 40 may be provided with various sensors that detect the status of the first post-processing device 31 and the second post-processing device 32.

[0034] In this embodiment, the mounting member 40 further includes a bracket 50 that is connected to the body frame 3 and extends above the body frame 3 behind the cab 14. The mounting member 40 is connected to the body frame 3 via the bracket 50.

[0035] A pair of left and right brackets 50 are provided. The brackets 50 extend rearward and upward from the upper rear end of the front frame 11 of the body frame 3. Each of the pair of left and right brackets 50 is connected to the front frame 11 via a fastening member such as a bolt. The mount member 40 is connected to each of the pair of left and right brackets 50 via a fastening member such as a bolt.

[0036] Fig. 9 is a perspective view from the right front showing a state in which the first post-processing device 31 and the second post-processing device 32 according to the embodiment are removed from the mount member 40. Fig. 10 is a perspective view from the right rear showing a portion of the mount member 40 according to the embodiment to which the position adjustment member 60 is attached. 8 to 10, this embodiment further includes a position adjustment member 60 configured to adjust the position of at least one of the first post-processing device 31 and the second post-processing device 32 relative to the mount member 40. The first post-processing device 31 and the second post-processing device 32 are attached to the mount member 40 via the position adjustment member 60 and restraining members 61, 62, etc.

[0037] A plurality of restraining members 61, 62 are provided. The plurality of restraining members 61, 62 are configured to include a plurality of first restraining members 61 that restrain the first post-processing device 31 and a plurality of second restraining members 62 that restrain the second post-processing device 32. Note that the plurality of first restraining members 61 and the plurality of second restraining members 62 may be configured from the same member (common part).

[0038] The multiple first restraining members 61 are arranged in pairs, aligned in the vertical direction along the outer periphery of the first aftertreatment device 31. The pairs of first restraining members 61 are arranged at intervals in the vehicle width direction. The first restraining members 61 are formed in a curved shape that follows the outer periphery of the first aftertreatment device 31. The pair of first restraining members 61 are rotatable around an axis that follows the vehicle width direction at the portion on the mount member 40 side.

[0039] In this embodiment, the pair of first restraint members 61 are rotatable about an axis along the vehicle width direction relative to the holding member 65. The pair of first restraint members 61 are connected to each other via fastening members such as bolts at a portion opposite the mount member 40. When the bolt fastening is released, the pair of first restraint members 61 are rotatable about an axis along the vehicle width direction relative to the holding member 65.

[0040] A portion of the holding member 65 is formed in a curved shape that fits along the outer periphery of the first post-processing device 31. The holding member 65 may be provided integrally with the mount member 40 (non-detachably).

[0041] The second restraining members 62 are arranged in pairs, aligned in the vertical direction along the outer periphery of the second aftertreatment device 32. The second restraining members 62 are arranged at intervals in the vehicle width direction. The second restraining members 62 are formed in a curved shape that follows the outer periphery of the second aftertreatment device 32. The pair of second restraining members 62 are rotatable around an axis that follows the vehicle width direction at the portion on the mount member 40 side.

[0042] In this embodiment, the pair of second restraint members 62 are rotatable about an axis along the vehicle width direction relative to the position adjustment member 60. The pair of second restraint members 62 are connected to each other via fastening members such as bolts at a portion opposite the mount member 40. When the bolt fastening is released, the pair of second restraint members 62 are rotatable about an axis along the vehicle width direction relative to the position adjustment member 60.

[0043] A portion of the position adjustment member 60 is formed in a curved shape that fits along the outer periphery of the second post-processing device 32. The position adjustment member 60 is provided separately from the mount member 40. The position adjustment member 60 is provided detachably with respect to the mount member 40. The position adjustment member 60 is connected to the mount member 40 via a fastening member such as a bolt.

[0044] An elongated hole 40h is formed in the portion of the mount member 40 where the position adjustment member 60 is attached. The elongated hole 40h is formed to open in the front-rear direction of the mount member 40 and to have a longitudinal direction in the up-down direction. For example, the position of the second post-processing device 32 relative to the mount member 40 can be adjusted by displacing the second restraint member 62 along the elongated hole 40h of the mount member 40.

[0045] Fig. 11 is a top view of the mounting member 40 according to the embodiment. Fig. 12 is a bottom view of the mounting member 40 according to the embodiment. Fig. 13 is a front view of the mounting member 40 according to the embodiment. Fig. 14 is a rear view of the mounting member 40 according to the embodiment. Fig. 15 is a left side view of the mounting member 40 according to the embodiment. Fig. 16 is a right side view of the mounting member 40 according to the embodiment. Referring also to Figures 11 to 16, the mounting member 40 is configured to include a rear-upward inclined plate 41 that extends rearward and upward behind the first after-treatment device 31 and the second after-treatment device 32, a left side plate 42 and a right side plate 43 that are arranged on the left and right sides of the first after-treatment device 31 and the second after-treatment device 32, respectively, and a connecting plate 44 that extends in the vehicle width direction to connect the left side plate 42 and the right side plate 43 to each other.

[0046] The rear upper inclined plate 41 extends longer in the vehicle width direction than each of the first after-treatment device 31 and the second after-treatment device 32. The rear upper end portion of the rear upper inclined plate 41 is disposed lower than the upper end of the first after-treatment device 31. The front lower end portion of the rear upper inclined plate 41 is disposed lower than the lower end of the second after-treatment device 32.

[0047] A plurality of elongated holes 40h are formed in the rear upper inclined plate 41 in a portion facing the second post-treatment device 32. The elongated holes 40h are formed so as to open in the front-rear direction of the rear upper inclined plate 41 and have a longitudinal direction in the up-down direction.

[0048] The rear-upper inclined plate 41 is formed with a plurality of relief holes 45A, 45B for avoiding the outlet pipe 34. The plurality of relief holes 45A, 45B are formed on the right side of the rear-upper inclined plate 41 and on the vehicle width direction center side, respectively. The relief hole 45A on the right side is formed longer in the vehicle width direction than the relief hole 45B on the vehicle width direction center side. The relief hole 45B on the vehicle width direction center side is formed longer in the up-down direction than the relief hole 45A on the right side. A plurality of lightening holes 46A, 46B, 46C may be formed on the left side of the rear upper inclined plate 41 for weight reduction or the like.

[0049] The left side plate 42 is formed in a shape that follows the left edge of the rear-upper inclined plate 41. The left side plate 42 is formed in a shape that extends further forward from the front end of the portion that follows the left edge of the rear-upper inclined plate 41. The left side plate 42 is formed in a shape that avoids the mixing pipe 33 when viewed from the vehicle width direction.

[0050] The right side plate 43 is formed in a shape that follows the right edge of the rear-upper inclined plate 41. The right side plate 43 is formed in a shape that extends further forward from the front end of the portion that follows the right edge of the rear-upper inclined plate 41. The right side plate 43 is formed in a shape that avoids the exhaust pipe 30 when viewed from the vehicle width direction. The right side plate 43 is formed in a shape that overlaps with parts of the first after-treatment device 31 and the second after-treatment device 32 when viewed from the vehicle width direction.

[0051] The connecting plate 44 is disposed below the second aftertreatment device 32. The connecting plate 44 extends in the vehicle width direction so as to connect the portions of the left side plate 42 and the right side plate 43 that extend further forward from the front end of the rear upper inclined plate 41. The configuration of the mount member 40 is not limited to the above, and can be changed according to design specifications.

[0052] <Action and effect> As described above, the work vehicle 1 of this embodiment includes the engine 2, the body frame 3 on which the engine 2 is mounted, the cab 14 supported above the body frame 3 so as to be rotatable from a seating position to a tilted position tilted rearward and upward, and the first aftertreatment device 31 and the second aftertreatment device 32 that treat exhaust gas emitted from the exhaust pipe 30 of the engine 2. When viewed in the vehicle width direction, the first aftertreatment device 31 and the second aftertreatment device 32 are arranged side by side behind the cab 14 and tilted rearward and upward. For example, if the first and second aftertreatment devices are arranged side by side vertically behind the cab, there is a high possibility that the cab rotating to the tilt position will come into contact with the first and / or second aftertreatment devices. In contrast, according to the present configuration, the first and second after-treatment devices 31 and 32 are arranged side by side at an upward and rearward tilt behind the cab 14, which prevents the cab 14 from coming into contact with the first and / or second after-treatment devices 31 and / or 32 when it rotates to the tilt position. Therefore, the tilt operation of the cab 14 can be realized.

[0053] In this embodiment, each of the first and second after-treatment devices 31 and 32 is disposed on the center side in the vehicle width direction so as to fit within a range RW of ⅔ or less of the overall vehicle width VW. For example, if the first and second aftertreatment devices are each positioned on the outside of the vehicle width so that they extend beyond two-thirds of the vehicle's overall width, there is a high possibility that the bent part will come into contact with the first and / or second aftertreatment device when the articulated body is turned to steer. In contrast, according to the present configuration, the first after-treatment device 31 and the second after-treatment device 32 are each disposed toward the center of the vehicle width direction so as to fit within a range RW of not more than two-thirds of the overall vehicle width VW, so that even when the articulated vehicle body is turned to steer, it is possible to prevent the bent portion from coming into contact with the first after-treatment device 31 and / or the second after-treatment device 32. Therefore, it is possible to realize the bending motion of the articulated vehicle body.

[0054] In this embodiment, the first aftertreatment device 31 includes a DPF device 31A equipped with a diesel particulate filter. The second aftertreatment device 32 includes an SCR device 32A that treats exhaust gas with a selective catalytic reduction catalyst. The SCR device 32A is disposed below the DPF device 31A. For example, if the SCR device is located above the DPF device, when DEF is injected into the mixing pipe to remove NOx, the flow will be from bottom to top (against gravity), which is likely to make mixing difficult. In contrast, with this configuration, the SCR device 32A is positioned lower than the DPF device 31A, so when DEF is injected in the mixing pipe 33 to remove NOx, the flow is from top to bottom (flow along gravity), making mixing easier.

[0055] In this embodiment, the exhaust gas further includes an outlet pipe 34 connected to the outlet of the SCR device 32A. The outlet pipe 34 is disposed behind the second aftertreatment device 32 and toward the center in the vehicle width direction. With this configuration, compared to when the outlet pipe 34 is disposed rearward of the second aftertreatment device 32 and outward in the vehicle width direction, even when the articulated vehicle body is turned to steer, the outlet pipe 34 can be prevented from coming into contact with the second aftertreatment device 32. Therefore, the articulated vehicle body can be turned.

[0056] In this embodiment, the apparatus further includes a box-shaped mount member 40 on which each of the first post-processing device 31 and the second post-processing device 32 is mounted. According to this configuration, sub-assembly can be performed by mounting each of the first post-processing device 31 and the second post-processing device 32 on the mount member 40. In addition, because the mount member 40 is box-shaped, even when a mixing pipe 33 connecting the first post-processing device 31 and the second post-processing device 32 to each other is provided, stress concentration on the mixing pipe 33 can be avoided.

[0057] In this embodiment, a position adjustment member 60 configured to be able to adjust the position of at least one of the first post-processing device 31 and the second post-processing device 32 relative to the mount member 40 is further provided. According to this configuration, by adjusting the position of at least one of the first post-processing device 31 and the second post-processing device 32 relative to the mount member 40 using the position adjustment member 60, tolerance variations can be absorbed during assembly.

[0058] In this embodiment, the mounting member 40 further includes a bracket 50 that is connected to the body frame 3 and extends above the body frame 3 behind the cab 14. The mounting member 40 is connected to the body frame 3 via the bracket 50. For example, if the mount member is directly connected to the vehicle frame, there is a risk that (1) stress will be concentrated on the mount member, and (2) tolerance variations will increase during assembly. In contrast, with this configuration, the mounting member 40 is connected to the body frame 3 via the bracket 50, which allows stress to be released to the bracket 50 and also absorbs tolerance variations during assembly in the bracket 50. Therefore, the above problems (1) and (2) can be solved.

[0059] <Modification> In the above-described embodiment, an example has been described in which the first and second after-treatment devices are each disposed toward the center in the vehicle width direction so as to fit within a range of 2 / 3 or less of the overall vehicle width, but this is not limited thereto. For example, the first and second after-treatment devices may each be disposed on the outer side in the vehicle width direction so as to extend beyond 2 / 3 of the overall vehicle width. For example, at least a portion of the first and / or second after-treatment devices may be disposed on the outer side in the vehicle width direction so as to extend beyond 2 / 3 of the overall vehicle width. The arrangement of the first and second after-treatment devices in the vehicle width direction can be changed depending on the design specifications.

[0060] In the above-described embodiment, an example has been described in which the first aftertreatment device is configured to include a DPF device equipped with a diesel particulate filter, the second aftertreatment device is configured to include an SCR device that treats exhaust gas with a selective catalytic reduction catalyst, and the SCR device is disposed below the DPF device. However, this is not limiting. For example, the SCR device may be disposed above the DPF device. For example, the SCR device and the DPF device may be disposed horizontally side by side. The arrangement of the SCR device and the DPF device can be changed depending on design specifications.

[0061] In the above-described embodiment, an example has been described in which the exhaust gas turbine engine further includes an outlet pipe connected to the outlet of the SCR device, and the outlet pipe is disposed rearward of the second aftertreatment device toward the center in the vehicle width direction. However, this is not limiting. For example, the outlet pipe may be disposed rearward of the second aftertreatment device toward the outside in the vehicle width direction. The arrangement of the outlet pipe can be changed according to design specifications.

[0062] In the above-described embodiment, an example was described in which the first post-processing device and the second post-processing device each include a box-shaped mounting member, but this is not limiting. For example, the first post-processing device and the second post-processing device each may be mounted on a flat mounting member (a shape other than a box). For example, the mounting member may not be provided. The shape and / or installation mode of the mounting member can be changed according to design specifications.

[0063] In the above-described embodiment, an example has been described in which a position adjustment member configured to adjust the position of at least one of the first post-processing device and the second post-processing device relative to the mount member is further provided, but this is not limited thereto. For example, each of the first post-processing device and the second post-processing device may be directly mounted on the mount member. For example, the position adjustment member may not be provided. The installation mode of the position adjustment member can be changed according to design specifications.

[0064] In the above-described embodiment, an example has been described in which the vehicle further includes a bracket connected to the body frame and extending above the body frame behind the cab, and the mount member is connected to the body frame via the bracket, but this is not limiting. For example, the mount member may be directly connected to the body frame. For example, the bracket may not be provided. The installation manner of the bracket can be changed depending on the design specifications.

[0065] In the above-described embodiment, an example has been described in which power is transmitted from a diesel engine serving as a drive source through a transmission to wheels, but this is not limiting. For example, the drive source may be an engine other than a diesel engine. For example, rotational power from a power source other than an engine may be transmitted to wheels. For example, the type of drive source may be changed depending on design specifications.

[0066] In the above-described embodiment, an articulated dump truck having a body frame composed of a front frame and a rear frame has been described as an example of a work vehicle, but the present invention is not limited to this. For example, the present invention may be applied to other work vehicles such as a rigid frame dump truck having a single body frame, a hydraulic excavator, a bulldozer, etc.

[0067] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the spirit of the present invention, and the above-described embodiments can also be combined as appropriate.

[0068] (Appendix 1) The engine and a vehicle body frame on which the engine is mounted; a cab supported above the vehicle body frame so as to be rotatable from a seating position to a tilt position inclined rearward and upward; a first after-treatment device and a second after-treatment device for treating exhaust gas discharged from an exhaust pipe of the engine; When viewed from the vehicle width direction, the first after-treatment device and the second after-treatment device are arranged side by side behind the cab and inclined rearward and upward. Work vehicle.

[0069] (Appendix 2) Each of the first after-treatment device and the second after-treatment device is disposed on the center side in the vehicle width direction so as to fit within a range of 2 / 3 or less of the overall width of the vehicle. A work vehicle as described in Appendix 1.

[0070] (Appendix 3) The first aftertreatment device is configured to include a DPF device equipped with a diesel particulate filter, the second aftertreatment device is configured to include an SCR device that treats the exhaust gas with a selective catalytic reduction catalyst, The SCR device is disposed below the DPF device. 1. A work vehicle as described in Appendix 1 or 2.

[0071] (Appendix 4) an outlet pipe connected to an outlet of the SCR device; The outlet pipe is disposed rearward of the second aftertreatment device and toward the center in the vehicle width direction. A work vehicle as described in Appendix 3.

[0072] (Appendix 5) further comprising a box-shaped mounting member on which each of the first post-processing device and the second post-processing device is mounted, A work vehicle as described in any of appendices 1 to 4.

[0073] (Appendix 6) a position adjustment member configured to adjust the position of at least one of the first post-processing device and the second post-processing device relative to the mount member; A work vehicle as described in Appendix 5.

[0074] (Appendix 7) a bracket connected to the body frame and extending above the body frame behind the cab; The mounting member is connected to an upper portion of the bracket. A work vehicle as described in Appendix 5 or 6. [Explanation of symbols]

[0075] 1...work vehicle, 2...engine, 3...body frame, 14...cab, 30...exhaust pipe, 31...first aftertreatment device, 31A...DPF device, 32...second aftertreatment device, 32A...SCR device, 34...outlet pipe, 40...mounting member, 50...bracket, 60...position adjustment member, VW...vehicle overall width, RW...range

Claims

1. The engine and a vehicle body frame on which the engine is mounted; a cab supported above the vehicle body frame so as to be rotatable from a seating position to a tilt position inclined rearward and upward; a first after-treatment device and a second after-treatment device for treating exhaust gas discharged from an exhaust pipe of the engine; When viewed from the vehicle width direction, the first after-treatment device and the second after-treatment device are arranged side by side behind the cab and inclined rearward and upward. Work vehicle.

2. each of the first after-treatment device and the second after-treatment device is disposed on a central side in the vehicle width direction so as to fit within a range of two-thirds or less of the overall width of the vehicle; The work vehicle according to claim 1 .

3. The first aftertreatment device is configured to include a DPF device equipped with a diesel particulate filter, the second aftertreatment device is configured to include an SCR device that treats the exhaust gas with a selective catalytic reduction catalyst, The SCR device is disposed below the DPF device. The work vehicle according to claim 1 or 2.

4. further comprising an outlet pipe connected to an outlet of the SCR device; the outlet pipe is disposed rearward of the second aftertreatment device and toward the center in the vehicle width direction. The work vehicle according to claim 3 .

5. further comprising a box-shaped mounting member on which each of the first post-processing device and the second post-processing device is mounted, The work vehicle according to claim 1 or 2.

6. a position adjustment member configured to adjust the position of at least one of the first post-processing device and the second post-processing device relative to the mount member; The work vehicle according to claim 5.

7. a bracket connected to the body frame and extending above the body frame behind the cab; The mount member is connected to the vehicle body frame via the bracket. The work vehicle according to claim 5.

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