Work vehicle

Abstract

To provide a working vehicle with a front guard covering a front part of an engine bonnet in which maintenance work of an engine room is easily performed and branches and the like are hardly got between the engine bonnet and the front guard.SOLUTION: An engine bonnet 20A is swingably and openably / closably supported around an opening and closing shaft core P positioned at the rear part of the engine bonnet 20A as a swinging fulcrum to be opened and closed in the vertical direction. A front guard 40 includes: a lower guard part 40A which is fixed to a vehicle body frame 9; and an upper guard part 40B in which attitude change can be performed between closing attitude where a connecting shaft core Y relative to the lower guard part 40A is as a swinging fulcrum and opening attitude where it is swung toward a vehicle body front side. The connecting shaft core Y is installed at the front side of the engine bonnet 20A. The upper guard part 40B includes: a lateral part 60 which is positioned along a vehicle body width direction at the front side of the engine bonnet 20A; and a longitudinal part 61 which extends from right and left end parts of the lateral part 60 to a vehicle body rear direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work vehicle having an engine bonnet that forms an engine compartment at the front of the vehicle body, and a front guard that covers the front portion of the engine bonnet. [Background technology]

[0002] Patent document 1 describes a work vehicle (tractor) equipped with a front guard that has a lower guard section (lower frame) supported in a fixed state on a vehicle body frame (front axle frame) and an upper guard section (upper frame) supported on the lower guard section, and the upper guard section is connected to the lower guard section via a connecting axis (axis of the first pivot and the second pivot) that runs along the width direction of the vehicle body, and is supported so that its position can be changed between a closed position (upright position) that runs along the front part of the engine bonnet (bonnet) with the connecting axis as a swing fulcrum, and an open position (forward leaning position) that swings toward the front of the vehicle body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-14191 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described work vehicle, for example, in an orchard, the upper guard is kept in a closed position and the front guard protects the engine bonnet from hitting tree branches, etc. However, if a branch gets caught in the gap between the front guard and the engine bonnet, the branch may break or damage the engine bonnet.

[0005] To provide a work vehicle which is less likely to damage the engine bonnet or branches, and which facilitates maintenance work on the engine room with the upper guard part in an open position. [Means for solving the problem]

[0006] The tractor according to the present invention comprises: An engine bonnet forming an engine compartment and a front guard covering a front portion of the engine bonnet are provided at the front of the vehicle body, and the engine bonnet is configured to be able to swing open and close up and down around an opening and closing axis located at the rear of the engine bonnet along the width direction of the vehicle body as a swing fulcrum, and the front guard has a lower guard portion supported in a fixed state by the vehicle body frame and an upper guard portion supported by the lower guard portion, and the upper guard portion is connected to the lower guard portion via a connecting axis along the width direction of the vehicle body. The upper guard portion is supported so as to be positionally changeable between a closed position in which the front portion is covered and an open position in which the upper guard portion is swung toward the front of the vehicle body, with the connecting shaft as a swing fulcrum, the connecting shaft being provided in front of the engine bonnet, the upper guard portion having a lateral portion located in front of the engine bonnet along the lateral width direction of the vehicle body, and a front-rear portion extending toward the rear of the vehicle body from left and right ends of the lateral portion when the upper guard portion is in the closed position, and in the open position, at least a part of the front-rear portion is located below the connecting shaft. 。

[0007] According to this configuration, when the upper guard portion is in the closed position, branches and the like heading inward toward the inside of the vehicle body are caught by the front-to-rear facing portion, making it difficult for branches and the like to get in between the engine bonnet and the front guard, and making it difficult for the engine bonnet or branches and the like to be damaged.

[0008] The engine bonnet can be opened by swinging it upward around the opening / closing shaft located at the rear as a swing fulcrum, allowing the engine compartment to be opened widely toward the front.In addition, the upper guard can be opened by swinging it toward the front of the vehicle around the connecting shaft located at the front of the engine bonnet as a swing fulcrum, creating a large open space between the open upper guard and the engine compartment, making it easy to perform maintenance work on the engine compartment.

[0009] In the present invention, The connecting shaft is preferably located at the same position as the middle point in the vehicle vertical direction of the front portion of the engine bonnet in the closed state.

[0010] With this configuration, the connecting shaft is higher above ground level, so the upper guard portion in the open position is supported in a forward-leaning position, and maintenance work on the engine room can be performed without the upper guard portion in the open position becoming an obstacle.

[0011] In the present invention, It is preferable that the rear portion of the longitudinally facing portion is located on one side of the engine bonnet when the engine bonnet is closed.

[0012] According to this configuration, branches and the like heading inward toward the vehicle body on the sides of the engine bonnet are caught by the rear of the lateral portion, making it more difficult for branches and the like to get in between the engine bonnet and the front guard, and making it less likely for the engine bonnet or branches and the like to be damaged.

[0013] In the present invention, It is preferable that the front-to-rear portion is configured so that when the upper guard portion is in the closed position, the distance between the center of the vehicle body in the left-right direction when viewed from above and the front-to-rear portion becomes wider toward the rear end of the front-to-rear portion.

[0014] According to this configuration, branches and the like received by the front-rear facing portion are pushed outward to the side of the vehicle body by the front-rear facing portion as the vehicle body moves forward, making it more difficult for the branches and the like to get in between the front guard and the engine bonnet, thereby making it less likely that the engine bonnet or branches and the like will be damaged.

[0015] In the present invention, It is preferable that a weight support portion protrudes forward from the body frame and is provided to which a balance weight is engaged, and that the lower guard portion extends obliquely in a forward and upward direction from the body frame so as to bypass the balance weight engaged with the weight support portion upward.

[0016] According to this configuration, the upper guard portion can be positioned above the balance weight while preventing the height of the balance weight, which is engaged with the weight support portion, from becoming too low above the ground.

[0017] In the present invention, a locking mechanism is provided on one of both lateral sides of the lower guard portion, the locking mechanism being switchable between a locked state in which the upper guard portion is fixed in the closed position and a released state in which the upper guard portion is released from the fixed position; It is preferable that the other of the two lateral sides is provided with a positioning mechanism that positions the upper guard part in the closed position by using a positioning portion provided on the lower guard part and an abutment portion provided on the upper guard part in a state that allows it to abut against and move away from the positioning portion.

[0018] With this configuration, when the upper guard is in the closed position, one of the two lateral sides of the upper guard is fixed to the lower card section by the locking mechanism, and the other of the two lateral sides of the upper guard is positioned by the positioning mechanism, so that the upper guard can be securely held in the closed position. If the locking mechanism is released from the one lateral side of the upper guard, the positioning mechanism is released as the upper guard is swung toward the open position, so that the upper guard can be easily changed to the open position while still being securely held in the closed position.

[0019] In the present invention, It is preferable that a fuel tank is provided at the front of the engine compartment.

[0020] According to this configuration, by opening the engine hood and putting the upper guard section into an open position, a large working space for performing work on the fuel tank appears in front of the fuel tank, making it easier to perform work such as refueling the fuel tank.

[0021] In the present invention, The vehicle is provided with an engine, an exhaust gas treatment device that purifies the engine's exhaust gas, and a reducing agent tank that stores reducing agent to be supplied to the exhaust gas treatment device, and it is preferable that the reducing agent tank be provided in the front part of the engine compartment.

[0022] According to this configuration, by opening the engine hood and placing the upper guard portion in an open position, a large working space for performing work on the reducing agent tank appears in front of the reducing agent tank, making it easy to perform work such as refilling the reducing agent into the reducing agent tank.

[0023] In the present invention, It is preferable that the lower guard portion is provided with a locking portion capable of locking a supply tank that replenishes the reducing agent to the reducing agent tank.

[0024] According to this configuration, the reducing agent can be replenished into the reducing agent tank while the replenishing tank is easily supported by engaging the replenishing tank with the engaging portion, making it easy to replenish the reducing agent into the reducing agent tank.

[0025] In the present invention, The vehicle body is preferably equipped with a driving section provided at the rear of the vehicle body and a rope provided at the driving section, and the rope is connected to the vehicle body frame so that it can be raised and lowered, with a support section and a top extending sideways from the upper part of the support section, and is preferably supported so that its position can be changed between an upright use position and a laid-down storage position in which the support section is located to the side of the engine bonnet and the top is located rearward of the connecting axis and forward of the engine bonnet.

[0026] With this configuration, when working in an orchard, for example, the ropes can be stored, making it easier to work because special care is not required to prevent the ropes from hitting branches, etc.

[0027] In the present invention, When the rope is in the stored position, the top is At least part of It is preferable that the position is lower than

[0028] With this configuration, when changing the position of the upper guard part, the upper guard part swings above the top of the ropes in the stored position. Therefore, even when the ropes are in the stored position, the top of the ropes does not obstruct the change in the position of the upper guard part. In other words, the position of the upper guard part can be easily changed to the closed position or the open position without the trouble of raising the ropes from the stored position.

[0029] Another tractor according to the present invention is provided with an engine bonnet forming an engine compartment at the front of a vehicle body, and a front guard covering a front portion of the engine bonnet, the engine bonnet being configured to be able to swing up and down to open and close around an opening / closing shaft located at the rear of the engine bonnet along the width direction of the vehicle body as a swing fulcrum, the front guard having a lower guard portion supported in a fixed state on a vehicle body frame, and an upper guard portion supported on the lower guard portion, the upper guard portion being connected to the lower guard portion via a connecting shaft located along the width direction of the vehicle body, and being supported so as to be able to change its position between a closed position covering the front portion and an open position swung toward the front of the vehicle body, the connecting shaft being located in front of the engine bonnet, The upper guard portion has a horizontal portion positioned along the width direction of the vehicle body, and a front-to-rear portion extending rearward from the left and right ends of the horizontal portion when the upper guard portion is in the closed position, and the vehicle body is provided with a driving section provided at the rear of the vehicle body and a rope provided at the driving section, and the rope is connected to the vehicle frame so that it can be raised and lowered and swingable, with a support section and a top extending sideways from the top of the support section, and is supported so that its position can be changed between an upright use position and a laid-down position in which the support section is located to the side of the engine bonnet and the top is located rearward of the connecting axis and forward of the engine bonnet, and the lower guard portion is provided with a rope support portion, and the rope support portion is configured so that the top is placed on the rope when the rope is in the stored position.

[0030] According to this configuration, the rope is supported by the rope support portion in the storage position, so that the support structure can be obtained inexpensively by utilizing the lower guard portion as a member for supporting the rope in the storage position, while the rope can be firmly supported in the storage position.

[0031] In the present invention, It is preferable that the upper guard portion is provided with a ROP pressing portion, and that the ROP pressing portion is configured to press the top portion against the ROP receiving portion when the upper guard portion is in the closed position.

[0032] According to this configuration, the rope is pressed against the rope support part by the rope pressing part in the storage position, so that the upper guard part and the lower guard part can be used as parts to fix the rope in the storage position, thereby obtaining a fixing structure at low cost, and the rope can be fixed so that it does not rattle in the storage position. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 is a side view showing the entire tractor. [Figure 2] FIG. 1 is a plan view showing the entire tractor. [Figure 3] This is a side view showing the upper guard portion in the closed position, the front engine bonnet in the closed position, and the ROPs in the stored position. [Figure 4] FIG. 10 is a side view of the driving unit with the upper guard portion in an open position and the front engine bonnet in an open position. [Figure 5] FIG. 2 is a plan view showing the reducing agent tank, the locking mechanism, and the positioning mechanism. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 2 is a perspective view of the lower guard portion and the upper guard portion in a separated state. [Figure 9] 10 is a cross-sectional view showing the connection structure between the left connecting portion and the vertical guard portion. FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. 10 is a rear view showing the ROPS receiving portion and the ROPS pressing portion. [Figure 14]FIG. 10 is a rear view showing a ROP receiving portion and a ROP pressing portion of another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0034] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings. In the following explanation, with respect to the running body of a tractor (an example of a "work vehicle"), the direction of arrow F shown in Figures 1, 2 and 10 will be referred to as the "forward direction of the body," the direction of arrow B shown in Figures 1, 2 and 10 will be referred to as the "rearward direction of the body," the direction of arrow U shown in Figures 1 and 10 will be referred to as the "upward direction of the body," the direction of arrow D shown in Figures 1 and 10 will be referred to as the "downward direction of the body," the direction of arrow L shown in Figure 2 will be referred to as the "leftward direction of the body," and the direction of arrow R shown in Figure 2 will be referred to as the "rightward direction of the body."

[0035] [Overall tractor] As shown in Figures 1 and 2, a tractor has a traveling body 3 supported by a pair of steerable and drivable front wheels 1 and a pair of drivable rear wheels 2. A body frame 4 of the traveling body 3 is made up of an engine 5, a flywheel housing 6 provided at the rear of the engine 5, a clutch housing 7 connected to the rear of the flywheel housing 6, a transmission case 8 connected to the rear of the clutch housing 7, and a front frame 9 connected to the bottom of the engine 5. A driving section 10 including the engine 5, a weight support section 11, and a front guard 40 are provided at the front of the traveling body 3. A driver's section 12 is formed at the rear of the traveling body 3. The driver's section 12 is equipped with a driver's seat 13, a steering wheel 14 for steering the front wheels 1, a ROP 15, etc. At the rear of the transmission case 8, there is provided a link mechanism 16 that connects a work implement such as a rotary tiller (not shown) so that it can be raised and lowered, and a power take-off shaft 17 that extracts power from the engine 5 and outputs it to the connected work implement.

[0036] [Motor unit] As shown in FIGS. 2 and 4 , the power plant 10 includes an engine compartment 21 formed by an engine bonnet 20. The engine 5 is provided in the engine compartment 21. The engine 5 is a diesel engine, and its crankshaft (not shown) is disposed along the fore-and-aft direction of the vehicle body. A first exhaust gas treatment device 22 that purifies exhaust gas emitted by the engine 5 is provided above the rear of the engine 5. A second exhaust gas treatment device 23 that purifies exhaust gas emitted by the engine 5 is provided behind the engine 5. A radiator 24 for cooling the engine, a reducing agent tank 25, a reducing agent pump 26, and a battery 27 are provided in the front of the engine compartment 21 and in front of the engine 5. As shown in FIGS. 2, 4, and 5 , the reducing agent tank 25, the reducing agent pump 26, and the battery 27 are arranged in the lateral width direction of the vehicle body and are disposed in front of the radiator 24. The reducing agent tank 25, the reducing agent pump 26, and the battery 27 are arranged in the lateral width direction of the vehicle body, with the reducing agent pump 26 located between the reducing agent tank 25 and the battery 27.

[0037] In the first exhaust gas treatment device 22, diesel particulates contained in the exhaust gas of the engine 5 are collected by a collection filter (not shown), and an exhaust gas purification process is performed to reduce the diesel particulates. In the second exhaust gas treatment device 23, urea water as a reducing agent is injected into the exhaust gas emitted from the first exhaust gas treatment device 22 and hydrolyzed, thereby performing an exhaust gas purification process to reduce the nitrogen oxides contained in the exhaust gas.

[0038] The reducing agent tank 25 is configured to store urea water as a reducing agent to be supplied to the second exhaust gas treatment device 23. The reducing agent pump 26 is driven by power from the battery 27, and is configured to extract urea water from the reducing agent tank 25 and supply the extracted urea water to the second exhaust gas treatment device 23.

[0039] As shown in FIGS. 1, 2, and 4, the engine bonnet 20 is divided into a front engine bonnet 20A, which forms the front portion of the engine compartment 21 and covers the reducing agent tank 25, the radiator 24, etc., and a rear engine bonnet 20B, which is located rearward of the front engine bonnet 20A and covers the second exhaust gas treatment device 23. As shown in FIG. 4, the front engine bonnet 20A is supported by the rear engine bonnet 20B so that it can swing up and down around an opening / closing axis P, which is located at the rear of the front engine bonnet 20A along the width direction of the vehicle body. The front engine bonnet 20A is supported on the rear engine bonnet 20B by a support frame 29 connected to the rear engine bonnet 20B, which supports the front engine bonnet 20A so that it can swing up and down. A damper 31, which biases the front engine bonnet 20A open, is attached between the inside of the front engine bonnet 20A and a support arm 30 extending forward and upward from the engine 5. The support arm 30 is supported by the support frame 29 via a connecting rod 32 that is connected to the connecting portion 29 a of the support frame 29 and the support arm 30 .

[0040] [Weight support part] As shown in FIG. 3, the weight support portion 11 projects forward from a front portion 9 a of a front frame 9 of the body frame 4 , and is configured to support a balance weight 33 .

[0041] The balance weight 33 is divided into a plurality of divided weights 33a in the width direction of the vehicle body, and each of the plurality of divided weights 33a is supported by the weight support portion 11 by being engaged with the weight support portion 11. As shown in Fig. 3, the weight support portion 11 has an upper locking portion 11a provided on the front upper portion of the weight support portion 11 and a lower locking portion 11b provided below the upper locking portion 11a. Each of the plurality of divided weights 33a is supported by the weight support portion 11 by having a hook portion formed on the rear upper portion of the divided weight 33a engage with the upper locking portion 11a and having a connecting hole provided below the hook portion engage with the lower locking portion 11b.

[0042] [Front guard] As shown in FIGS. 3, 6, etc., the front guard 40 has a lower guard portion 40A fixedly supported by the body frame 4, and an upper guard portion 40B supported by the lower guard portion 40A.

[0043] 6 and 7, the weight support portion 11 has been removed. As shown in Figures 3, 6 and 7, the lower guard portion 40A is fixedly supported by the front frame 9 of the body frame 4 by connecting a lower portion of the lower guard portion 40A to the front portion 9a of the front frame 9. The lower guard portion 40A is connected to the front frame 9 by connecting bolts 41 (see FIG. 6). The lower guard portion 40A extends forward and upward from the front portion 9a of the front frame 9 in a state where it bypasses the balance weight 33, which is engaged with the weight support portion 11, in an upward direction.

[0044] Specifically, as shown in Figures 3, 6, 7 and 8, the lower guard portion 40A has a pair of left and right vertical guard portions 42 which have an arc-shaped shape in side view so as to go around the balance weight 33 engaged with the weight support portion 11 in an upward direction, a lower lateral guard portion 43 which is installed between the lower end of the left vertical guard portion 42 and the lower end of the right vertical guard portion 42, and an upper lateral guard portion 44 which is installed between the vertical middle portion of the left vertical guard portion 42 and the vertical middle portion of the right vertical guard portion 42.

[0045] The lower guard portion 40A has a mounting portion 43a formed on the lower part of the lower lateral guard portion 43, and is fixedly supported on the front frame 9 by connecting the mounting portion 43a to the front portion 9a of the front frame 9. The mounting portion 43a is connected to the front frame 9 by a connecting bolt 41 (see FIG. 6).

[0046] As shown in Figures 3 and 4, the upper guard portion 40B is connected to the lower guard portion 40A via a connecting axis Y located at the front lower portion of the upper guard portion 40B along the vehicle width direction, and is supported by the lower guard portion 40A in a state in which it can change its position between a closed position (see Figure 3) in which it covers the front portion 20F of the front engine bonnet 20A in a closed state, with the connecting axis Y as a swing fulcrum, and an open position (see Figure 4) in which it swings from the closed position toward the front of the vehicle body to open the front of the front engine bonnet 20A.

[0047] The front guard 40 is configured so that the connecting axis Y is located in front of the front engine bonnet 20A. A large open space can be created between the upper guard portion 40B and the engine room 21 when in the open position.

[0048] The front guard 40 is configured so that the position of the connecting axis Y in the vertical direction of the vehicle body is the same as the position of an intermediate portion 20C (see FIG. 4) in the vertical direction of the vehicle body of a front portion 20F of the front engine bonnet 20A in the closed state. The height of the connecting axis Y above the ground is increased, and the upper guard portion 40B in the open position can be supported in a forward-sloping state (see FIG. 4).

[0049] The upper guard portion 40B is supported by the lower guard portion 40A by a left connecting portion 50a (see Figure 8) provided on the left front lower portion of the upper guard portion 40B being connected to the tip portion 42a of the left vertically facing guard portion 42 of the lower guard portion 40A, and by a right connecting portion 50b (see Figure 8) provided on the right front lower portion of the upper guard portion 40B being connected to the tip portion 42a of the right vertically facing guard portion 42 of the lower guard portion 40A.

[0050] [Connection structure between the left connecting part and the vertical guard part] 9, the connecting structure 51 between the left connecting part 50a and the left vertical guard part 42 includes a fulcrum shaft 52 that is inserted through the left connecting part 50a and the tip part 42a of the vertical guard part 42 and that swingably connects the left connecting part 50a to the vertical guard part 42 and has a connecting axis Y, and a pressing member 53 that is fitted onto the fulcrum shaft 52 on the side opposite to the side on which the left connecting part 50a is located with respect to the tip part 42a. Friction plates 54 are interposed between the left connecting part 50a and the tip part 42a, and between the tip part 42a and the pressing member 53, respectively.

[0051] A rotation prevention portion 53a that fits over the left connecting portion 50a from above is provided at the bent end of the pressing member 53. The rotation prevention portion 53a abuts against the left connecting portion 50a to prevent the pressing member 53 from rotating relative to the left connecting portion 50a, allowing the pressing member 53 to swing together with the left connecting portion 50a relative to the vertical guard portion 42, with the connecting axis Y serving as the swing fulcrum. The rotation prevention portion 53a is slidable relative to the left connecting portion 50a in the direction along the connecting axis Y, allowing the pressing member 53 to move relative to the vertical guard portion 42 in the direction along the connecting axis Y.

[0052] Two disc springs 55, an annular pressure plate 56, and a cap 57 covering the disc springs 55 and pressure plate 56 are fitted onto the fulcrum shaft 52 on the side opposite to the side on which the friction plate 54 is positioned with respect to the pressure member 53. When a threaded hole member 58 engaged with the screw shaft portion of the fulcrum shaft 52 is tightened, the pressure plate 56 is pressed toward the disc springs 55 by the threaded hole member 58, and the two disc springs 55 and the cap 57 are pressed against the pressure member 53 by the pressure plate 56, causing the two disc springs 55 to elastically deform. The elastic restoring force of the disc spring 55 presses the pressing member 53 toward the left connecting portion 50a, and one friction plate 54 is sandwiched between the left connecting portion 50a and the tip portion 42a, and the other friction plate 54 is sandwiched between the pressing member 53 and the tip portion 42a, and the friction plate 54 applies frictional resistance to the swinging of the left connecting portion 50a relative to the vertical guard portion 42. When the position of the upper guard portion 40B is changed, the friction plate 54 applies frictional resistance to the swinging of the upper guard portion 40B. The right connecting portion 50b is connected to the tip portion 42a of the right vertical guard portion 42 by a fulcrum shaft 52. No friction plate 54 is interposed in the connecting structure between the right connecting portion 50b and the right vertical guard portion 42.

[0053] As shown in Figures 6, 7, and 8, the upper guard portion 40B has horizontal portions 60 located at two upper and lower locations on the front of the upper guard portion 40B along the vehicle width direction, a pair of upper front-to-rear portions 61 whose front ends are connected to the left and right ends of the upper horizontal portion 60 of the two horizontal portions 60 at the upper and lower locations, and a pair of lower front-to-rear portions 61 whose front ends are connected to the left and right ends of the lower horizontal portion 60 of the two horizontal portions 60 at the upper and lower locations.

[0054] 3, 6, and 7, the two upper and lower lateral portions 60 are configured to be located in front of the front engine bonnet 20A and above the balance weight 33 engaged with the weight support portion 11. The pair of upper front-rearward-facing portions 61 on the left and right sides extend rearward from the left or right end of the upper lateral portion 60 when the upper guard portion 40B is in the closed position, with the rear portions 61a of the upper front-rearward-facing portions 61 located laterally of the front portion 20F of the front engine bonnet 20A in the closed position. The pair of lower front-rearward-facing portions 61 on the left and right sides extend rearward from the left or right end of the lower lateral portion 60 when the upper guard portion 40B is in the closed position, with the rear portions 61a of the lower front-rearward-facing portions 61 located laterally of the front portion 20F of the front engine bonnet 20A in the closed position.

[0055] As shown in Figures 2 and 7, when the upper guard portion 40B is in a closed position, the pair of upper front-rear facing portions 61 and the pair of lower front-rear facing portions 61 are in a rearward and outward facing position so that the distance K between the center C of the vehicle body in the left-right direction when viewed from above and the front-rear facing portions 61 becomes wider toward the rear end of the front-rear facing portions 61.

[0056] In this embodiment, two horizontal portions 60 are provided and two front-to-rear portions 61 are provided on the left and right sides, but only one horizontal portion 60 or three or more horizontal portions 60 and only one front-to-rear portion 61 or three or more horizontal portions 60 may be provided.

[0057] As shown in Figure 8, the upper guard portion 40B is constructed by combining curved round pipe steel material that forms the upper horizontal portion 60 and the upper left and right front-to-rear portions 61, straight round pipe steel material that forms the lower horizontal portion 60, curved round pipe steel material that forms the lower left and right front-to-rear portions 61, round pipe steel material that connects the curved round pipe steel material and the straight round pipe steel material, and round pipe steel material that connects the curved round pipe steel material to the curved round pipe steel material. In this embodiment, the upper guard portion 40B is made of round pipe steel, but various other materials can be used for the upper guard portion 40B, such as round steel, square bar steel, square pipe steel, and strip steel.

[0058] [Locking mechanism, positioning mechanism] As shown in Figures 5 and 7, one of the two lateral side portions 40L, 40R of the lower guard portion 40A, the lateral side portion 40L, is provided with a locking mechanism 70 that can fix the upper guard portion 40B in a closed position, and the other of the two lateral side portions 40L, 40R of the lower guard portion 40A, the lateral side portion 40R, is provided with a positioning mechanism 80 that can position the upper guard portion 40B in a closed position.

[0059] In this embodiment, as shown in Figures 5 and 7, the locking mechanism 70 is provided on the left side 40L of the two side portions 40L, 40R of the lower guard portion 40A. The locking mechanism 70 may be provided on the right side portion 40R instead of the left side portion 40L of the lower guard portion 40A. As shown in Figures 5, 11, and 12, the locking mechanism 70 includes a locking shaft 71 that fixes the upper guard portion 40B in the closed position, an operating device 72 that releases the fixation of the closed position, and a lock-biasing spring 73.

[0060] As shown in FIGS. 11 and 12 , the lock shaft 71 is supported by a support hole 74 that is elongated in the front-rear direction and provided in the left vertical guard portion 42 and a support hole 76 that is elongated in the front-rear direction and provided in a first support portion 75a that is located laterally outward of the vertical guard portion 42. The first support portion 75a is provided on a support member 75 that protrudes laterally outward from the vertical guard portion 42, and the first support portion 75a is supported by the vertical guard portion 42. The lock shaft 71 is supported so as to be slidable between a locked position located at the rear of the support holes 74, 76 and an unlocked position located at the front of the support holes 74, 76. The operating device 72 extends forward from the lock shaft 71 and is supported so as to be slidable back and forth between a notch portion of a second support portion 75b provided in the support member 75 and a through-hole of a support member 77 provided in the support member 75. The spring 73 is fitted onto the operating tool 72 and is disposed between two spring receivers 78 provided on the operating tool 72 between the lock shaft 71 and the second support portion 75b, and is configured to slide and urge the lock shaft 71 to the lock position.

[0061] 8, a lock arm 79 is provided on the left rear portion of the upper guard portion 40B. Specifically, the lock arm 79 extends from the bent round steel pipe 45 that constitutes the front-rear portion 61 on the upper left side of the upper guard portion 40B.

[0062] In the locking mechanism 70, when the upper guard portion 40B is swung toward the closed position, the locking shaft 71 is pushed from above by a cam portion 79a formed on the lower tip side of the locking arm 79, and is slid from the locked position toward the unlocked position against the force of the spring 73, allowing the locking arm 79 to descend below the locking shaft 71. When the upper guard portion 40B reaches the closed position, as shown in FIG. 12, the locking shaft 71 is returned to the locked position by the spring 73 and engages with the upper tip side of the locking arm 79, thereby entering a locked state that fixes the upper guard portion 40B in the closed position.

[0063] In the locking mechanism 70, when the operating device 72 is slid forward against the spring 73, the locking shaft 71 is slid by the operating device 72 from the locked position to the unlocked position, and is disengaged forward from the locking arm 79, thereby entering an unlocked state so as to release the upper guard part 40B from its fixed position in the closed position.

[0064] In this embodiment, as shown in Figures 5 and 7, the positioning mechanism 80 is provided on the right side 40R of the two side portions 40L, 40R of the lower guard portion 40A. The positioning mechanism 80 may be provided on the left side portion 40L instead of the right side portion 40R of the lower guard portion 40A. As shown in Figures 8 and 10, the positioning mechanism 80 has a positioning portion 81 provided on the right vertical guard portion 42.

[0065] 8 and 10, the upper guard portion 40B is provided at its rear right portion with an abutment portion 82 that can abut against the positioning portion 81. Specifically, the abutment portion 82 extends from the bent round steel pipe 46 that constitutes the front-rear portion 61 on the upper right side of the upper guard portion 40B.

[0066] In the positioning mechanism 80, as shown in Figure 10, when the upper guard part 40B is placed in the closed position, the abutment part 82 of the upper guard part 40B abuts against the positioning part 81 from above, and the positioning part 81 receives and supports the abutment part 82 from below, thereby positioning the upper guard part 40B in the closed position.

[0067] In the positioning mechanism 80, when the upper guard portion 40B is swung from the closed position to the open position, the abutment portion 82 moves upward away from the positioning portion 81, and the positioning is released so that the upper guard portion 40B is released from the closed position.

[0068] [ROPS] 1 and 2, the ROPS 15 has a pair of left and right support columns 15a and a top portion 15b extending from the top of one of the pair of left and right support columns 15a toward the top of the other support column 15a and connecting to the top of the other support column 15a. The top portion 15b is provided in a horizontal position along the width direction of the vehicle body.

[0069] The ROPS 15 is supported by the body frame 4 in a state in which it can be raised and lowered around the connecting axis Z, with the lower portion of each of a pair of left and right support columns 15a connected to a pair of left and right support columns 85 provided on the body frame 4 via a connecting axis Z extending laterally from the vehicle body. The ROPS 15 can be changed between an upright use position in front of the driver's section 12 as shown in FIG. 1 and a retracted position as shown in FIGS. 2 and 3, in which the pair of left and right support columns 15a are located laterally of the front engine bonnet 20A and the top 15b is located rearward of the connecting axis Y of the upper guard section 40B and forward of the front engine bonnet 20A. The ROPS 15 in the use position is fixed in the use position by attaching a lock pin to a pin hole 15c in the support column 15a and a pin guide 18 (see FIG. 3) provided on the support column 85.

[0070] As shown in FIGS. 2 and 3, when the ROPs 15 is in the stored position and the upper guard portion 40B is in the closed position, the top 15b is in contact with the upper front-rear portion 61. At least part of and is configured to be positioned lower than the lower front-rear facing portion 61. By changing the position of the upper guard portion 40B to the closed position after the ROPs 15 is in the stored position, the front-rear facing portion 61 does not come into contact with the top portion 15b, and the upper guard portion 40B can be in the closed position. The position of the upper guard portion 40B can be changed from the closed position to the open position while the ROPs 15 is left in the stored position.

[0071] As shown in Figure 3, when the ROP 15 is in the stored position and the upper guard part 40B is in the closed position, the top part 15b rests on the ROP receiving part 90 provided on the lower guard part 40A, and the ROP pressing part 95 provided on the upper guard part 40B presses the top part 15b against the ROP receiving part 90, so that the top part 15b is sandwiched from above and below between the ROP receiving part 90 and the ROP pressing part 95.

[0072] [ROPS support part] 6, 8, and 13, the ROP support portion 90 projects upward from the upper lateral guard portion 44 of the lower guard portion 40A. The ROP support portion 90 has a cushion portion 91 that projects upward from the upper portion 90a of the ROP support portion 90, and is configured so that the cushion portion 91 receives the top portion 15b.

[0073] [ROPS pressing part] As shown in FIGS. 6, 8, and 13, the ROPS pressing portion 95 is supported by the upper horizontal portion 60 and the lower horizontal portion 60 of the upper guard portion 40B. Specifically, a support member 97 is connected to a pair of vertically oriented round steel pipes 96 that connect the upper horizontal portion 60 and the lower horizontal portion 60, and the ROPS pressing portion 95 is connected to the support member 97 with a connecting bolt 98. The ROPS pressing portion 95 includes a cushion portion 99 that protrudes downward from the pressing edge portion 95a of the ROPS pressing portion 95, and the cushion portion 99 is configured to press the top portion 15b toward the ROPS receiving portion 90. In this embodiment, the ROPS receiving portion 90 and the cushion portions 91, 99 of the ROPS pressing portion 95 are made of rubber. In addition to rubber, leather, spring material, etc. can be used for the cushion portions 91, 99.

[0074] When the ROPS 15 is not in the stored position, rattle of the upper guard part 40B in the closed position can be prevented by the ROPS pressing part 95. The same applies to a work vehicle that is not equipped with the ROPS 15. Specifically, the ROPS pressing part 95 is changed in position from the horizontal position for pressing the top, in which the pressing side part 95a faces downward, to the vertical position (the position indicated by the two-dot chain line A), in which the pressing side part 95a faces horizontally, and connected to the support member 97. Then, the horizontal side part 95b of the ROPS pressing part 95 protrudes downward from the support member 97 and is pressed against the cushion part 91 of the ROPS receiving part 90, preventing rattle of the upper guard part 40B in the closed position.

[0075] For example, when working in an orchard, as shown in FIGS. 2 and 3, the rope protector 15 is placed in the storage position and the upper guard portion 40B is placed in the closed position. However, when the rope protector 15 is placed in the storage position from the state in which the upper guard portion 40B is in the closed position and the rope protector 15 is placed in the use position, the upper guard portion 40B is placed in the open position so that the top portion 15b does not come into contact with the front-rear portion 61, and the rope protector 15 is placed in the storage position. Then, the upper guard portion 40B is returned to the closed position. The upper guard portion 40B is then positioned in the closed position by the positioning mechanism 80. The locking mechanism 70 also securely fastens the upper guard portion 40B in the closed position. The front guard 40 protects the front engine hood 20A from branches and other debris, while the upper and lower front-rear portion 61 can catch and prevent branches and other debris from getting caught between the front guard 40 and the front engine hood 20A. Furthermore, the rearward-outward position of the upper and lower front-rear portion 61 allows the vehicle to travel while pushing branches and other debris toward the sides of the vehicle. In addition, since the top 15b of the rope 15 is sandwiched between the rope support portion 90 and the rope pressing portion 95, the rope 15 can be maintained in the stored position. This prevents the rope 15 from hitting branches, etc. Also, rattling of the rope 15 during travel can be suppressed.

[0076] When performing work on the engine compartment 21, such as refilling the reducing agent tank 25 with urea water, the upper guard portion 40B is opened and the front engine bonnet 20A is opened, as shown in FIG. 4 . When attempting to open the upper guard portion 40B, the upper and lower front-rear portions 61 do not come into contact with the top 15b of the ROP 15 in the stored position, and the upper guard portion 40B can be opened while the ROP 15 is in the stored position. This allows the engine compartment 21 to be widely opened, and a large working space is created between the upper guard portion 40B in the opened position and the engine compartment 21, making it easy to perform work on the engine compartment 21. The structure of the present invention makes it easy to refill the reducing agent tank 25.

[0077] When the upper guard portion 40B is changed to the open position, friction resistance is applied to the upper guard portion 40B by the friction plate 54. This prevents the upper guard portion 40B from swinging forcefully due to its own weight.

[0078] When refilling the reducing agent tank 25 with urea water, the lower part of the supply tank (not shown) can be engaged with the engaging portion 44a (see FIG. 7) provided on the upper lateral guard portion 44 of the lower guard portion 40A, thereby making it possible to easily support the supply tank and facilitate the refilling operation.

[0079] [Another embodiment] (1) FIG. 14 is a front view showing a ROP receiving portion 90 and a ROP pressing portion 95 of another embodiment. In another embodiment, the ROPS support portion 90 is supported on the upper horizontal guard portion 44 via a support member 92 that rises from the upper horizontal guard portion 44 of the lower guard portion 40A, and a pair of connecting bolts 93 that connect the upper portion 92a of the support member 92 to the ROPS support portion 90.

[0080] The attachment of the ROPS support portion 90 to the pair of connecting bolts 93 is achieved by the connecting bolts 93 being configured so that they protrude upward from the support member 92 and pass through the upper portion 90a of the ROPS support portion 90, and a pair of threaded hole members 94 that sandwich the upper portion 90a from above and below are engaged with the connecting bolts 93. By rotating the pair of threaded hole members 94 on each of the pair of connecting bolts 93 to change the attachment positions of the pair of threaded hole members 94 on the connecting bolt 93, the attachment position of the ROPS support portion 90 relative to the connecting bolts 93 can be changed up or down, and the attachment height of the ROPS support portion 90 relative to the lower guard portion 40A can be adjusted.

[0081] As shown in Figure 14, the ROPS pressing portion 95 of another embodiment is supported on the upper lateral portion 60 and the lower lateral portion 60 by a support structure having a configuration similar to the support structure of the ROPS pressing portion 95 shown in Figure 13.

[0082] When the ROPS 15 is not in the stored position, the ROPS pressing portion 95 can prevent rattle of the upper guard portion 40B in the closed position. The same applies to work vehicles that do not have the ROPS 15. Specifically, the ROPS pressing portion 95 is changed in position from the horizontal position for pressing the top portion 15b to the vertical position and connected to the support member 97. Then, the horizontal side portion 95b of the ROPS pressing portion 95 protrudes downward from the support member 97 and is pressed against the cushion portion 91 of the ROPS receiving portion 90, preventing rattle of the upper guard portion 40B in the closed position.

[0083] (2) In the above embodiment, an example was shown in which the reducing agent tank 25 was provided in the front part of the engine compartment 21, but this is not limiting, and a fuel tank (not shown) for the engine, or both the fuel tank and the reducing agent tank 25, may be provided in the front part of the engine compartment 21. The structure of the present invention makes it easy to replenish the fuel tank.

[0084] (3) In the above embodiment, an example is shown in which the locking mechanism 70 is provided on the left lateral side portion 40L of the lower guard portion 40A and the positioning mechanism 80 is provided on the right lateral side portion 40R of the lower guard portion 40A, but it is also possible for the locking mechanism 70 to be provided on the right lateral side portion 40R of the lower guard portion 40A and the positioning mechanism 80 to be provided on the left lateral side portion 40L of the lower guard portion 40A.

[0085] (4) In the above embodiment, an example was shown in which the front engine bonnet 20A and the rear engine bonnet 20B were provided, but it would also be acceptable to provide only one engine bonnet that can be opened and closed vertically.

[0086] (5) In the above embodiment, an example is shown in which the position of the connecting axis Y in the vertical direction of the vehicle body is the same as the position of the intermediate point 20C in the vertical direction of the vehicle body of the front portion 20F of the front engine bonnet 20A, but this is not limited to this, and the connecting axis Y may be located below or above the intermediate point 20C.

[0087] (6) In the above embodiment, an example was shown in which two front-rear facing portions 61 were provided, one at the top and one at the bottom, but only one, or three or more, front-rear facing portions 61 may be provided.

[0088] (7) In the above embodiment, an example in which the weight support portion 11 is provided is shown, but the weight support portion 11 may not be provided.

[0089] (8) In the above embodiment, an example was shown in which the ROPs 15 was provided, but the ROPs 15 may not be provided.

[0090] (9) In the above embodiment, an example is shown in which a ROP receiving portion 90 and a ROP pressing portion 95 are provided, but it is also possible to use an example in which the ROP receiving portion 90 and the ROP pressing portion 95 are not provided, or which only has the ROP receiving portion 90.

[0091] (10) In the above embodiment, an example was shown in which the locking portion 44a was provided, but the locking portion 44a may not be provided. [Industrial Applicability]

[0092] The present invention is applicable to a tractor equipped with an engine bonnet and a front guard. [Explanation of symbols]

[0093] 4 Body frame 5 Engine 9 Front frame (body frame) 11 Weight support part 12 Driving Department 15 Rops 15a Strut part 15b Top 20A Front engine bonnet (engine bonnet) 20F front part 20C midpoint 21 Engine Room 23 Exhaust gas treatment equipment 25 Reductant tank 33 Balance weight 40 Front guard 40A Lower guard 40B Upper guard 40L Left side (one side) 40R Right lateral side (other lateral side) 44a Locking part 60 Horizontal section 61 Front and rear facing section 61a rear 70 Locking mechanism 80 Positioning mechanism 81 Positioning part 82 Contact part 90 ROPS support part 95 ROPS pressing part C center K interval P Opening / closing axis

Claims

1. An engine bonnet that forms an engine compartment and a front guard that covers a front portion of the engine bonnet are provided at the front of the vehicle body, the engine bonnet is configured to be able to swing open and close up and down around an opening / closing axis located at a rear portion of the engine bonnet along the width direction of the vehicle body as a swing fulcrum, the front guard has a lower guard portion fixedly supported on the body frame and an upper guard portion supported by the lower guard portion, the upper guard portion is connected to the lower guard portion via a connecting shaft that is aligned in the vehicle body width direction, and is supported so as to be positionally changeable between a closed position in which the upper guard portion covers the front portion and an open position in which the upper guard portion is swung toward the front of the vehicle body, with the connecting shaft as a swing fulcrum; the connecting shaft is provided in front of the engine bonnet, the upper guard portion has a lateral portion located in front of the engine bonnet along the vehicle body lateral width direction, and a front-rear portion extending rearward from left and right ends of the lateral portion when the upper guard portion is in the closed position, In the open position, at least a portion of the front-rear portion is positioned below the connecting shaft center.

2. 2. The work vehicle according to claim 1, wherein the connecting shaft is located at the same position as the middle point in the vehicle vertical direction of the front portion of the engine bonnet when the engine bonnet is closed.

3. 2. The work vehicle according to claim 1, wherein the rear portion of the longitudinally extending portion is located laterally of the engine hood when the engine hood is closed.

4. The work vehicle according to claim 3, wherein the front-to-rear portion is configured such that, when the upper guard portion is in the closed position, the distance between the center of the vehicle body in the left-right direction in a plan view of the vehicle body and the front-to-rear portion becomes wider toward the rear end of the front-to-rear portion.

5. a weight support portion that protrudes forward from the body frame and to which a balance weight is attached; 2. The work vehicle according to claim 1, wherein the lower guard portion extends obliquely upward and forward from the body frame so as to bypass the balance weight engaged with the weight support portion.

6. a locking mechanism is provided on one of both lateral sides of the lower guard portion, the locking mechanism being switchable between a locked state in which the upper guard portion is fixed in the closed position and a released state in which the upper guard portion is released from the fixed position; The work vehicle according to claim 1, wherein the other of the two lateral sides is provided with a positioning mechanism that positions the upper guard part in the closed position by using a positioning portion provided on the lower guard part and an abutment portion provided on the upper guard part in a state that allows it to abut against and move away from the positioning portion.

7. 2. The work vehicle according to claim 1, wherein a fuel tank is provided at the front of the engine compartment.

8. The system includes an engine, an exhaust gas treatment device that purifies exhaust gas from the engine, and a reducing agent tank that stores a reducing agent to be supplied to the exhaust gas treatment device, 2. The work vehicle according to claim 1, wherein the reducing agent tank is provided at a front portion of the engine compartment.

9. 9. The work vehicle according to claim 8, wherein the lower guard portion is provided with a locking portion capable of locking a supply tank that replenishes the reducing agent to the reducing agent tank.

10. The vehicle body is provided with a driving section provided at a rear portion of the vehicle body and a ROP provided at the driving section, The work vehicle described in claim 1, wherein the ROPs is connected to the body frame so as to be able to swing up and down, with a support column and a top extending laterally from the upper part of the support column, and is supported so as to be able to change its position between an upright usage position and a laid-down storage position in which the support column is located to the side of the engine bonnet and the top is located rearward of the connecting axis and forward of the engine bonnet.

11. 11. A work vehicle according to claim 10, wherein when the rope is in the stored position, the top portion is positioned lower than at least a portion of the front-to-rear portion.

12. An engine bonnet that forms an engine compartment and a front guard that covers a front portion of the engine bonnet are provided at the front of the vehicle body, the engine bonnet is configured to be able to swing open and close up and down around an opening and closing axis located at a rear portion of the engine bonnet along the width direction of the vehicle body as a swing fulcrum, the front guard has a lower guard portion fixedly supported on the body frame and an upper guard portion supported by the lower guard portion, the upper guard portion is connected to the lower guard portion via a connecting shaft that is aligned in the vehicle body width direction, and is supported so as to be positionally changeable between a closed position in which the upper guard portion covers the front portion and an open position in which the upper guard portion is swung toward the front of the vehicle body, with the connecting shaft as a swing fulcrum; the connecting shaft is provided in front of the engine bonnet, the upper guard portion has a lateral portion located in front of the engine bonnet along the vehicle body lateral width direction, and a front-rear portion extending rearward from left and right ends of the lateral portion when the upper guard portion is in the closed position, The vehicle body is provided with a driving section provided at a rear portion of the vehicle body and a ROP provided at the driving section, The ROPs has a support column and a top extending laterally from an upper portion of the support column, and is connected to the body frame so as to be able to swing up and down, and is supported so as to be able to change its position between an upright use position and a laid-down storage position in which the support column is located to the side of the engine bonnet and the top is located rearward of the connecting shaft and forward of the engine bonnet, The lower guard portion is provided with a rope support portion, The rope support portion of the work vehicle is configured so that the top portion of the rope is placed on it when the rope is in the stored position.

13. The upper guard portion is provided with a ROPS pressing portion, The work vehicle according to claim 12, wherein the ROP pressing portion is configured to press the top portion against the ROP receiving portion when the upper guard portion is in the closed position.

Images