work vehicle hood structure

Abstract

To provide a hood structure of a work vehicle making it possible to preferably couple a damper to a hood.SOLUTION: A hood structure includes a hood 9 that swings vertically to open or close an engine room E, a damper 30 that assists the opening or closing motion of the hood 9, a support member 40 that supports an end of the dumper 30 via a first swing shaft 45a so that the end can swing, and a coupling member 50 that is bonded to an internal surface of the hood 9 with an adhesive 60 and to which the other end of the dumper 30 is coupled via a second swing shaft 52a so that the other end can swing.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the technology of the bonnet structure of a work vehicle.

Background Art

[0002] Conventionally, the technology of the bonnet structure of a work vehicle equipped with a damper for assisting the opening and closing operation of the bonnet has been known. For example, it is as described in Patent Document 1.

[0003] In the technology described in Patent Document 1, a pair of left and right telescopic dampers (gas springs) are provided inside the bonnet. One end of the damper is supported by the frame, and the other end of the damper is connected to the bonnet. By configuring it in this way, the opening and closing operation of the bonnet can be assisted by the force with which the damper tries to extend.

[0004] Here, as a method of connecting the damper to the bonnet, a method of fixing a connecting member to the bonnet by welding and connecting the damper to the connecting member can be considered. However, when a connecting member is welded to the bonnet, welding marks are generated, so there is a risk that the appearance quality of the bonnet will deteriorate.

[0005] Therefore, in the technology described in Patent Document 1, a connecting member (intermediate frame) to which the damper is connected is formed in a frame shape extending across the left and right both ends of the bonnet, and the connecting member is fixed to the bonnet at an inconspicuous position near the left and right both ends of the bonnet. By this, the welding marks can be made less conspicuous.

[0006] However, in the technology described in Patent Document 1, the connecting member for connecting the damper to the bonnet has become larger in size and its shape has also become more complicated. For this reason, there are problems such as interference easily occurring between the connecting member and other members and an increase in cost.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Japanese Patent Publication No. 2015-223991 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] One aspect of this disclosure has been made in view of the above circumstances, and the problem it seeks to solve is to provide a bonnet structure for a work vehicle that can suitably connect a damper to the bonnet. [Means for solving the problem]

[0009] The problem that one aspect of this disclosure aims to solve is as described above, and the means for solving this problem will now be explained.

[0010] One embodiment of the present disclosure includes a hood that can swing up and down to open and close the engine compartment, a damper that assists in the opening and closing operation of the hood, a support member that swingably supports one end of the damper via a first pivot shaft, and a connecting member that is bonded to the inner surface of the hood with adhesive and to which the other end of the damper is swingably connected via a second pivot shaft. The support member comprises a plate-shaped portion having a first plate-shaped portion fixed to the vehicle body, a second plate-shaped portion formed to bend relative to the first plate-shaped portion, and a third plate-shaped portion formed to bend relative to the second plate-shaped portion and supporting one end of the damper; a first reinforcing portion provided on one side of the plate-shaped portion and fixed to the second plate-shaped portion and the third plate-shaped portion; and a second reinforcing portion provided on the other side of the plate-shaped portion and fixed to the first plate-shaped portion and the second plate-shaped portion. It is what it is.

[0011] In one embodiment of the present disclosure, the connecting member is formed in a plate shape with its longitudinal direction oriented perpendicular to the axial direction of the second pivot shaft and comprises an adhesive portion that is bonded to the bonnet and a connecting portion fixed to the adhesive portion, to which the damper is pivotably connected via the second pivot shaft.

[0012] In one embodiment of the present disclosure, the adhesive portion is formed in an R-shape that is bent along the longitudinal direction.

[0013] In one embodiment of the present disclosure, the connecting portion is formed such that the portion fixed to the adhesive portion is wider on the side farther from one end of the damper with respect to the second pivot axis than on the side closer to one end of the damper.

[0014] In one embodiment of the present disclosure, the adhesive is covered with a paint for painting the hood and the connecting member.

[0015] In one embodiment of this disclosure, the damper is located above the engine.

[0016] In one embodiment of this disclosure, the first pivot shaft is positioned higher than the radiator.

[0017] In one embodiment of this disclosure, the first pivot axis is positioned higher than the center of the air cleaner.

[0018] In one embodiment of the present disclosure, the damper is positioned above the DPF when the hood is closed.

[0019] In one embodiment of the present disclosure, the support member is formed to conform to the curved side surface of the DPF.

[0020] In one embodiment of this disclosure, the support member is connected to a DPF support portion for supporting the DPF.

[0022] In one embodiment of the present disclosure, the support member is fixed to the engine and has an engagement portion formed thereon into which a hook for lifting the engine can be engaged. [Effects of the Invention]

[0023] According to one aspect of this disclosure, the damper can be suitably connected to the hood. [Brief explanation of the drawing]

[0024] [Figure 1] Side view showing the overall configuration of the tractor. [Figure 2] Side partial cross-sectional view schematically showing the configuration inside the bonnet. [Figure 3] Side partial cross-sectional view showing the damper, support member, and connecting member. [Figure 4] Front partial cross-sectional view showing the damper, support member, and connecting member. [Figure 5] Exploded upper perspective view showing the damper and support member. [Figure 6] Bottom perspective view showing the damper, support member, and connecting member. [Figure 7] Side partial cross-sectional view showing the connecting member. [Figure 8] Side partial cross-sectional view schematically showing the configuration inside the bonnet according to the second embodiment. [Figure 9] Side partial cross-sectional view showing the damper, support member, and connecting member according to the second embodiment. [Figure 10] Exploded upper perspective view showing the DPF support portion, damper, support member, and connecting member according to the second embodiment. [Figure 11] Upper perspective view showing the damper and support member according to the second embodiment.

Mode for Carrying Out the Invention

[0025] Hereinafter, the directions indicated by the arrows U, D, F, B, L, and R in the drawings will be defined as the upward, downward, forward, backward, leftward, and rightward directions, respectively, and the description will be given.

[0026] First, the overall configuration of the tractor 1 according to the first embodiment will be described using FIG. 1.

[0027] The tractor 1 mainly includes a body frame 2, an engine 3, a transmission case 4, a hydraulic lifting device 5, front wheels 6, rear wheels 7, fenders 8, a bonnet 9, a cab 10, a rollover protective structure 11, and the like.

[0028] The machine frame 2 is positioned with its longitudinal direction oriented in the front-to-back direction. The engine 3 is fixed to the rear of the machine frame 2. Behind the engine 3 is the transmission case 4. A hydraulic lifting device 5 is provided at the rear of the transmission case 4. Various work devices (for example, a rotary tiller) can be attached to the hydraulic lifting device 5. The transmission case 4 houses a power transmission mechanism (not shown), such as a transmission.

[0029] Furthermore, the front of the aircraft frame 2 is supported by a pair of front wheels 6 via a front axle mechanism (not shown). The transmission case 4 is supported by a pair of rear wheels 7 via a rear axle mechanism (not shown). The pair of rear wheels 7 are generally covered from above by fenders 8.

[0030] The engine 3 is located in the engine compartment E, which is covered by the bonnet 9. The bonnet 9 is designed to pivot up and down around a pivot shaft 9a (see Figures 2 and 3) located at its rear. By pivoting the bonnet 9 upward, the engine compartment E can be opened. Behind the bonnet 9 is a passenger compartment 10 where the driver sits. Behind the passenger compartment 10 is a protective cover 11.

[0031] The power from engine 3 is shifted by a transmission (not shown) housed in a transmission case 4, and then transmitted to the front wheels 6 via the front axle mechanism, and also to the rear wheels 7 via the rear axle mechanism. In this way, the power from engine 3 rotates the front wheels 6 and the rear wheels 7, allowing the tractor 1 to move.

[0032] The arrangement of each component inside the hood 9 (engine compartment E) will be explained below with reference to Figures 2 to 4.

[0033] Inside the hood 9 are the engine 3, air cleaner 21, muffler 22, battery 23, radiator 24, fan shroud 25, fan 26, and fuel tank 27, among other components.

[0034] The engine 3, shown in Figures 2 to 4, is located at the rear of the engine compartment E. The engine 3 is supported by the aircraft frame 2.

[0035] The air cleaner 21 is for removing dust from the air and sending it to the engine 3. The air cleaner 21 is located to the upper right of the engine. The air cleaner 21 is formed in a roughly cylindrical shape and is positioned with its axis facing forward and backward. Air from in front of the radiator 24, which will be described later, is introduced into the air cleaner 21 via the intake pipe 21a. The air that has been dust-removed by the air cleaner 21 is supplied to the engine 3.

[0036] The muffler 22 is designed to reduce noise from the engine 3 and to expel exhaust gases. The muffler 22 is located to the upper left of the engine (to the left of the air cleaner 21). The muffler 22 is formed in a roughly cylindrical shape and is positioned with its axis oriented front to back. Exhaust gases from the engine 3 are introduced into the muffler 22. The exhaust gases introduced into the muffler 22 are then discharged to the outside through the exhaust pipe 22a.

[0037] The battery 23 shown in Figure 2 is for supplying power to the tractor 1's powered components (e.g., starter motor, work lights, etc.). The battery 23 is located at the front of the engine compartment E.

[0038] The radiator 24 is for cooling the coolant of the engine 3. The radiator 24 is located behind the battery 23. The radiator 24 is also located in front of the engine 3, the air cleaner 21, and the muffler 22.

[0039] The fan shroud 25 guides air from front to rear. The fan shroud 25 has through holes (not shown) that penetrate from front to back. The fan shroud 25 is formed to surround the fan 26, which will be described later, from the outer periphery. The fan shroud 25 is positioned behind the radiator 24 and in front of the engine 3.

[0040] The fan 26 is designed to blow air towards the rear. The fan 26 is connected to the shaft 3a of the engine 3. The fan 26 is driven by the power of the engine 3, which is transmitted via the shaft 3a.

[0041] The fuel tank 27 stores the fuel used by the engine 3. The fuel tank 27 is located at the rear of the engine 3.

[0042] Below, we will explain the structure of the bonnet 9 (bonnet structure) using Figures 2 to 7.

[0043] As shown in Figures 2 to 4, the tractor 1 of this embodiment is provided with a damper 30 to assist in opening and closing the bonnet 9. One end of the damper 30 is supported by a support member 40. The other end of the damper 30 is attached to the bonnet 9 via a connecting member 50. The configuration of each component will be described below.

[0044] The damper 30 is for assisting in the opening and closing of the hood 9. The damper 30 is composed of a cylinder that can extend and retract in the longitudinal direction. For example, a gas cylinder filled with gas, an oil cylinder filled with oil, etc., can be used as the damper 30. The damper 30 is configured to extend to a predetermined length by the force of the gas or the like that it is filled with. As a result, when the damper 30 is connected to the hood 9, as will be described later, the hood 9 can be biased upward.

[0045] The support member 40 shown in Figures 3 to 5 pivotably supports one end of the damper 30. The support member 40 mainly comprises a plate-shaped portion 41, a back portion 42, a first reinforcing portion 43, a second reinforcing portion 44, and a connecting portion 45.

[0046] The plate-like portion 41 is a part formed in the shape of a plate having an appropriate thickness. The plate-like portion 41 is positioned with its plate surface generally facing in the front-to-back direction. The plate-like portion 41 is formed in a substantially rectangular shape with its longitudinal direction oriented vertically when viewed from the front. The plate-like portion 41 is bent at its upper and lower intermediate points. As a result, the plate-like portion 41 has a first plate-like portion 41a that is substantially parallel to the vertical direction, a second plate-like portion 41b that extends forward and upward from the upper end of the first plate-like portion 41a, and a third plate-like portion 41c that extends substantially vertically upward from the upper end of the second plate-like portion 41b. In this way, the plate-like portion 41 is formed such that the upper part (third plate-like portion 41c) is located in front of the lower part (first plate-like portion 41a).

[0047] The rear portion 42 is the part that forms the back of the support member 40. The rear portion 42 is positioned with its plate surface facing in the front-to-back direction. The rear portion 42 is formed in a substantially rectangular shape with its longitudinal direction oriented vertically when viewed from the front. The rear portion 42 is fixed to the back of the first plate-like portion 41a of the plate-like portion 41. The upper part of the rear portion 42 is positioned to protrude upward from the first plate-like portion 41a. An engaging portion 42a is formed on the rear portion 42 (see Figure 6).

[0048] The engaging portion 42a shown in Figure 6 is a hole formed to penetrate the upper right portion of the rear portion 42 from front to back. A hook for lifting the engine 3 can be engaged with the engaging portion 42a. The engaging portion 42a only needs to be configured to lift the engine 3, and its shape is not limited. For example, a member that can engage with a hook for lifting the engine 3 (for example, a hook-shaped member) can be fixed to the rear portion 42 as the engaging portion.

[0049] The first reinforcing portion 43 shown in Figures 3 to 5 is a part for reinforcing the support member 40. The first reinforcing portion 43 is positioned with its plate surface facing left to right. The first reinforcing portion 43 is provided on the rear side of the plate-like portion 41. Specifically, the first reinforcing portion 43 is fixed by welding or the like to the front side of the rear portion 42, the rear upper surface of the second plate-like portion 41b, and the back surface of the third plate-like portion 41c. The first reinforcing portion 43 is positioned approximately in the left-right center of the plate-like portion 41.

[0050] The second reinforcing portion 44 is a part for reinforcing the support member 40. The second reinforcing portion 44 is positioned with its plate surface facing left to right. The second reinforcing portion 44 is provided on the front side of the plate-like portion 41. Specifically, the second reinforcing portion 44 is fixed to the front side of the first plate-like portion 41a and the front lower surface of the second plate-like portion 41b by welding or the like, respectively. The first reinforcing portion 43 is positioned slightly to the right of the approximate center of the plate-like portion 41.

[0051] The connecting portion 45 is the part to which one end of the damper 30 is pivotably connected. The connecting portion 45 is formed in a substantially rectangular plate shape and is positioned with its plate surface facing left to right. The connecting portion 45 is provided on the front side of the plate-shaped portion 41. Specifically, the connecting portion 45 is fixed to the front side of the third plate-shaped portion 41c by welding or the like. The connecting portion 45 is positioned approximately in the left-right center of the plate-shaped portion 41. The upper part of the connecting portion 45 is positioned to protrude upward from the upper end of the plate-shaped portion 41. The connecting portion 45 is provided with a first pivot shaft 45a.

[0052] The first pivot shaft 45a is formed in a substantially cylindrical shape. The first pivot shaft 45a is positioned with its axial direction facing left and right. The first pivot shaft 45a is fixed to the upper part of the connecting portion 45. The first pivot shaft 45a is positioned to protrude to the left from the left side surface of the connecting portion 45. One end (rear end) of the damper 30 is inserted through the first pivot shaft 45a. In this way, the damper 30 is pivotably connected to the support member 40.

[0053] As shown in Figures 2 to 4, the support member 40 is fixed to the engine 3. Specifically, the lower part of the plate-shaped portion 41 (first plate-shaped portion 41a) is fixed to the upper part of the rear of the engine 3. This positions the support member 40 so that it protrudes upward from the engine 3. The first pivot axis 45a of the support member 40 is positioned higher than the center (axis) of the air cleaner 21 and the center of the muffler 22. In particular, in this embodiment, the first pivot axis 45a of the support member 40 is positioned higher than the upper end of the air cleaner 21 and the upper end of the muffler 22.

[0054] The connecting member 50 shown in Figures 3, 4, 6, and 7 is to which the other end of the damper 30 is pivotably connected. The connecting member 50 mainly comprises an adhesive portion 51 and a connecting portion 52.

[0055] The adhesive portion 51 shown in Figures 6 and 7 is the part that is bonded to the bonnet 9. The adhesive portion 51 is formed in a roughly rectangular plate shape. The adhesive portion 51 is positioned so that its plate surface faces the inner surface (bottom surface) of the top plate of the bonnet 9. The adhesive portion 51 is positioned with its longitudinal direction oriented in the front-rear direction (a direction perpendicular to the axial direction (left-right direction) of the second pivot axis 52a, which will be described later). The adhesive portion 51 is formed in an R shape that bends along its longitudinal direction. The radius of curvature r of the adhesive portion 51 is formed to be the same as the radius of curvature of the inner surface of the bonnet 9 that the adhesive portion 51 faces. The adhesive portion 51 is formed so as not to bend along the short direction (left-right direction) (so that it is straight in a front cross-sectional view). The adhesive portion 51 is bonded to the inner surface of the top plate of the bonnet 9 with adhesive 60. In this case, the adhesive portion 51 is positioned in front of the first pivot axis 45a of the support member 40 when the bonnet 9 is closed (see Figure 3, etc.).

[0056] The connecting portion 52 is the part to which the other end of the damper 30 is pivotably connected. The connecting portion 52 is formed in a plate shape and is positioned with its plate surface facing left and right. The upper end surface of the connecting portion 52 is formed to follow the lower surface of the adhesive portion 51. The upper end surface of the connecting portion 52 is fixed to the lower surface of the adhesive portion 51 by welding or the like. A second pivot shaft 52a for pivotably connecting the damper 30 is inserted through the connecting portion 52.

[0057] The second pivot shaft 52a shown in Figures 5 and 7 is formed in a substantially cylindrical shape. The second pivot shaft 52a is positioned with its axial direction oriented left to right. The second pivot shaft 52a is positioned so as to pass through the connecting portion 52 and the other end (front end) of the damper 30 from left to right. In this way, the damper 30 is pivotably connected to the connecting member 50.

[0058] As shown in Figure 7, the connecting portion 52 is formed such that the front portion of the upper end surface (fixing portion F) fixed to the adhesive portion 51 is wider than the rear portion. More specifically, using the center of the second pivot axis 52a (more precisely, a straight line L passing through the center of the second pivot axis 52a and perpendicular to the adhesive portion 51 in a side view (see Figure 7)) as a reference, the front-to-back width of the portion Ff in front of the center of the second pivot axis 52a is wider than the front-to-back width of the rear portion Fr. In other words, the portion Ff of the fixing portion F that is farther from one end of the damper 30 (first pivot axis 45a (see Figure 3, etc.)) is wider than the portion Fr that is closer to one end of the damper 30. With this configuration, when a force pushing forward from the damper 30 is applied to the connecting portion 52, the force can be received over a wide area of ​​the fixing portion F (the front portion Ff), thus preventing damage to the fixing portion F.

[0059] As shown in Figure 7, in this embodiment, after the connecting member 50 (adhesive portion 51) is bonded to the bonnet 9, the bonnet 9 and the connecting member 50 are painted, so that the adhesive 60 used to bond the connecting member 50 and the bonnet 9 is covered with paint 70. In this way, by covering the adhesive 60 interposed between the connecting member 50 and the bonnet 9 with paint 70, deterioration of the adhesive 60 can be prevented.

[0060] As described above, in the bonnet structure of this embodiment, a damper 30 is provided near the left-right center of the bonnet 9 (above the engine 3). One end of the damper 30 is pivotably supported by the support member 40 via a first pivot shaft 45a. The other end of the damper 30 is pivotably connected to the connecting member 50 via a second pivot shaft 52a. As a result, the damper 30 is positioned above the engine 3, extending from the support member 40 to the connecting member 50.

[0061] By providing a damper 30 on the hood 9, for example, when swinging the hood 9 upward to open the engine compartment E as shown in Figure 2, the damper 30's extension force can assist in the swinging of the hood 9. This allows the operator to swing the hood 9 upward with relatively little force. Also, for example, when swinging the hood 9 downward to cover the engine compartment E, the damper 30 can prevent the hood 9 from swinging rapidly downward due to its own weight.

[0062] In this embodiment, the connecting member 50 for connecting the damper 30 to the hood 9 is fixed to the hood 9 with adhesive 60. This prevents welding marks from appearing on the hood 9, thereby improving the appearance quality of the hood 9. Furthermore, since there is no need to devise the size or shape of the members (stays, etc.) for connecting the damper 30 to the hood 9 in order to make welding marks less noticeable, the connecting member 50 can be made with a relatively simple structure, thereby reducing costs.

[0063] As described above, the bonnet structure of the tractor 1 (work vehicle) according to this embodiment is The hood 9 swings up and down to open and close the engine compartment E, A damper 30 assists in the opening and closing operation of the hood 9, A support member 40 that pivotably supports one end of the damper 30 via a first pivot shaft 45a, A connecting member 50 is bonded to the inner surface of the bonnet 9 with adhesive 60, and the other end of the damper 30 is pivotably connected to it via a second pivot shaft 52a, It is equipped with the following features. This configuration allows the damper 30 to be suitably connected to the hood 9. Specifically, since the connecting member 50 for connecting the damper 30 to the hood 9 is fixed to the hood 9 with adhesive 60, no welding marks or other defects are left on the hood 9, improving the appearance quality of the hood 9. Furthermore, since there is no need to devise the size or shape of the members (stays, etc.) for connecting the damper 30 to the hood 9 in order to make welding marks or other defects less noticeable, the connecting member 50 can be made relatively simple in construction, thereby reducing costs.

[0064] Furthermore, the connecting member 50 is The adhesive portion 51 is formed in a plate shape with its longitudinal direction oriented perpendicular to the axial direction of the second pivot shaft 52a and is bonded to the bonnet 9, A connecting portion 52 is fixed to the adhesive portion 51 and is pivotably connected to the damper 30 via the second pivot shaft 52a, It is equipped with the following features. By configuring it in this way, the longitudinal direction of the adhesive portion 51 can be oriented in line with the direction in which force is received from the damper 30, thereby firmly fixing the adhesive portion 51 to the bonnet 9.

[0065] Furthermore, the adhesive portion 51 is It is formed in an R-shape that bends along the longitudinal direction. By configuring it in this way, the adhesive portion 51 can be aligned with the inner surface of the curved bonnet 9, and the adhesive portion 51 can be firmly fixed to the bonnet 9.

[0066] Furthermore, the connecting portion 52 is Of the fixing portion F to the adhesive portion 51, the portion furthest from one end of the damper 30 (front portion Ff) is formed to be wider than the portion closer to one end of the damper 30 (rear portion Fr), with respect to the second pivot axis 52a. This configuration allows the connecting portion 52 to be firmly fixed to the adhesive portion 51. Specifically, when a force such as a damper 30 is applied to the connecting portion 52, the force can be received over a wide area of ​​the fixed portion F, thus preventing damage to the fixed portion F.

[0067] Furthermore, the adhesive 60 is The bonnet 9 and the connecting member 50 are covered with paint 70 for painting. By configuring it in this way, the adhesive 60 can be covered with paint 70, thereby preventing deterioration of the adhesive 60.

[0068] Furthermore, the damper 30 is It is located above engine 3. This configuration allows the damper 30 to be positioned relatively high, thus saving space in the engine compartment E. In this case, the connecting member 50 is more likely to be subjected to a relatively large force from the damper 30, but by orienting the longitudinal direction of the adhesive portion 51 in line with the direction in which the force is received from the damper 30, it is possible to prevent the connecting member 50 (adhesive portion 51) from falling off the hood 9.

[0069] Furthermore, the first oscillating shaft 45a is It is positioned higher than the radiator 24. By configuring it in this way, the damper 30 can be positioned at a relatively high location, thereby saving space in the engine compartment E.

[0070] Furthermore, the first oscillating shaft 45a is It is positioned higher than the center of the air cleaner 21. By configuring it in this way, the damper 30 can be positioned at a relatively high location, thereby saving space in the engine compartment E.

[0071] Furthermore, the support member 40 is A plate-shaped part 41 fixed to the engine 3, The first reinforcing portion 43 is provided on one side of the plate-shaped portion 41, A second reinforcing portion 44 is provided on the other side of the plate-shaped portion 41, It is equipped with the following features. By configuring it in this way, the support member 40 is made robust, which prevents deflection, deformation, etc., of the support member 40 that supports the damper 30.

[0072] Furthermore, the support member 40 is It is fixed to the engine 3 and has an engaging portion 42a into which a hook for lifting the engine 3 can be engaged. By configuring it in this way, the support member 40 can also be used as a member (lifting device) for lifting the engine 3, eliminating the need to provide a separate lifting device, which allows for space saving in the engine room E and reduces costs.

[0073] In the following section, the tractor 1 according to the second embodiment will be described using Figures 8 to 11.

[0074] The tractor 1 according to the second embodiment differs from the tractor 1 according to the first embodiment in that it is equipped with a DPF 28. Furthermore, due to the inclusion of the DPF 28, the layout and structure of the components within the engine compartment E differ in some respects. The differences from the first embodiment will be described in detail below. Components that are generally the same as those in the first embodiment are denoted by the same reference numerals and their descriptions will be omitted as appropriate.

[0075] The DPF (Diesel Particulate Filter) 28 shown in Figures 8 and 9 is for collecting PM (particulate matter) in the exhaust gas discharged from the engine 3. The DPF 28 is positioned above the engine 3. The DPF 28 is connected to the engine 3 via piping. The DPF 28 is formed in a roughly cylindrical shape and is positioned above the engine 3 with its axis oriented left and right. The DPF 28 is supported by a DPF support section 29.

[0076] The DPF support section 29 shown in Figures 8 to 10 is for supporting the DPF 28. The DPF support section 29 mainly comprises a pair of left and right upright sections 29a and a mounting section 29b.

[0077] The vertical section 29a is the part that connects to the aircraft frame 2. The vertical section 29a is positioned on the left and right sides of the engine 3, with its longitudinal direction facing up and down. The lower part of the vertical section 29a is fixed to the aircraft frame 2. The upper part of the vertical section 29a is formed to extend above the engine 3.

[0078] The mounting section 29b is the part on which the DPF 28 is mounted. The mounting section 29b is formed in a substantially flat shape with its plate surface facing up and down. The mounting section 29b is fixed to the upper part of the left and right upright sections 29a. In this way, the mounting section 29b is positioned to connect the left and right upright sections 29a.

[0079] In this manner, the DPF support section 29 is positioned to straddle the engine 3 from left to right. The DPF 28 is placed on the mounting section 29b and then appropriately secured. Note that the configuration of the DPF support section 29 is not limited to this, and its shape, arrangement, and fixing method can be changed as desired.

[0080] The air cleaner 21 of the second embodiment shown in Figures 8 and 9 is formed in a substantially cylindrical shape and is positioned in front of the DPF 28 with its axial direction oriented left to right.

[0081] As shown in Figures 9 to 11, in the second embodiment, the damper 30 is supported by a support member 90, which has a different configuration from the support member 40 of the first embodiment. The support member 90 mainly comprises a plate-shaped portion 91, a first reinforcing portion 92, and a connecting portion 93.

[0082] The plate-like portion 91 is a part formed in the shape of a plate having an appropriate thickness. The plate-like portion 91 mainly comprises a lower plate-like portion 91a and an upper plate-like portion 91b.

[0083] The lower plate-like portion 91a is formed in a roughly L-shape in side view, having a lower portion formed substantially horizontally and an upper portion extending substantially vertically upward from the front end of the lower portion. The lower portion (bottom surface) of the lower plate-like portion 91a is fixed to the rear of the engine 3 via an appropriate fixing member 3b. The upper portion (front surface) of the lower plate-like portion 91a is fixed to the rear end of the mounting portion 29b of the DPF support portion 29.

[0084] The upper plate-like portion 91b is positioned with its plate surface generally facing in the front-to-back direction. The lower part of the upper plate-like portion 91b is fixed to the upper front surface of the lower plate-like portion 91a. As a result, the upper plate-like portion 91b is positioned to protrude upward from the lower plate-like portion 91a. A second reinforcing portion 91c is formed on the upper plate-like portion 91b. The second reinforcing portion 91c is formed by bending the right end of the upper plate-like portion 91b forward. In this way, the second reinforcing portion 91c is provided on the front surface side of the upper plate-like portion 91b (plate-like portion 91).

[0085] The first reinforcing portion 92 is positioned with its plate surface facing left to right. The first reinforcing portion 92 is provided on the rear side of the plate-like portion 91. Specifically, the first reinforcing portion 92 is fixed to the lower and upper parts of the plate-like portion 91, which is formed in a roughly L-shape when viewed from the side, by welding or the like.

[0086] The connecting portion 93 is the part to which one end of the damper 30 is pivotably connected. The connecting portion 93 is formed in a substantially rectangular plate shape and is positioned with its plate surface facing left to right. The connecting portion 93 is provided on the front side of the plate-shaped portion 91. Specifically, the connecting portion 93 is fixed to the front side of the upper plate-shaped portion 91b by welding or the like. The connecting portion 93 is positioned near the left end of the upper plate-shaped portion 91b. The connecting portion 93 is formed such that the front-to-back width of the upper part is greater than the front-to-back width of the lower part. As a result, the upper part of the connecting portion 93 is formed to bulge forward. A first pivot shaft 93a is provided on the upper part of the connecting portion 93. One end (rear end) of the damper 30 is pivotably connected to the first pivot shaft 93a.

[0087] As described above, the support member 90 in the second embodiment is positioned to extend upward from the rear of the engine 3 (behind the DPF support 29). The first pivot axis 93a of the support member 90 is positioned higher than the center of the air cleaner 21 and the center of the muffler 22. When the bonnet 9 is closed (see Figure 9), the damper 30 connected to the support member 90 is positioned to extend front to back above the DPF 28.

[0088] The connecting portion 93 of the support member 90 is formed to follow the curved side surface of the DPF 28 in a side view (see Figure 9). That is, the upper part of the connecting portion 93 is formed to bulge forward to follow the side surface of the DPF 28. The lower part of the connecting portion 93 is also formed to avoid interference with the DPF 28. This ensures that the front-to-back width of the connecting portion 93 is secured while avoiding interference with the DPF 28, thereby firmly supporting the damper 30. Note that the shape of the connecting portion 93 is not limited to this embodiment. For example, the front surface of the connecting portion 93 can be formed into a curved shape having approximately the same radius of curvature as the side surface of the DPF 28.

[0089] As described above, the damper 30 according to the second embodiment is It is located above the DPF28 ​​when the bonnet 9 is closed. By configuring it in this way, the damper 30 can be positioned at a relatively high location, thereby saving space in the engine compartment E.

[0090] Furthermore, the support member 90 (connecting portion 93) is It is formed to follow the curved surface of the DPF28. By configuring it in this way, the support member 90 can be positioned along the DPF 28, thereby saving space in the engine room E.

[0091] Furthermore, the support member 90 is It is connected to the DPF support section 29 for supporting the DPF 28. By configuring it in this way, the support member 90 and the DPF support part 29 can be connected, thereby firmly fixing both members together.

[0092] Although embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention as described in the claims.

[0093] For example, as shown in the first and second embodiments described above, the bonnet structure of the present invention can be applied to work vehicles regardless of the presence or absence of a DPF28. Furthermore, the bonnet structure of the present invention can be applied to work vehicles regardless of the arrangement of each component inside the bonnet 9 (engine room E).

[0094] Furthermore, the specific configuration (shape, etc.) of the support members 40 and 90, the connecting member 50, etc., is not particularly limited and can be changed as desired. For example, reinforcing members can be added to or removed from the support members 40 and 90 and the connecting member 50 as needed. In addition, the configuration (shape, etc.) can be changed as desired depending on the arrangement of each component inside the bonnet 9 (engine room E).

[0095] Furthermore, although the above embodiment shows an example in which the adhesive portion 51 of the connecting member 50 is formed in an R shape, the present invention is not limited to this. In other words, if the connecting member 50 can be fixed to the bonnet 9 with sufficient adhesive force, it is not necessarily required to form the adhesive portion 51 in an R shape.

[0096] Furthermore, in the above embodiment, the support members 40 and 90 are mainly fixed to the engine 3, but the present invention is not limited to this, and it is also possible to fix them to members other than the engine 3 (such as the aircraft frame 2), or to fix them to multiple members (for example, both the engine 3 and members other than the engine 3).

[0097] Furthermore, although a tractor 1 was used as an example of a work vehicle in the above embodiment, the present invention is not limited to this and can also be applied to other agricultural vehicles, construction vehicles, industrial vehicles, etc. [Explanation of symbols]

[0098] 1 tractor 9. Hood 21 Air Cleaner 24 Radiator 28 DPF 29 DPF support part 30 dampers 40 Support member 41 Plate-shaped member 42a Engagement part 43 First reinforcing member 44 Second reinforcing member 45a First swing axis 50 Connecting members 51 Adhesive part 52 Connecting part 52a Second swing axis 60 Adhesives 70 paint

Claims

1. A hood that swings up and down to open and close the engine compartment, A damper that assists in the opening and closing operation of the aforementioned hood, A support member that pivotably supports one end of the damper via a first pivot axis, A connecting member is bonded to the inner surface of the hood with adhesive, and the other end of the damper is pivotably connected to it via a second pivot shaft, It is equipped with, The aforementioned support member is A plate-shaped portion comprising a first plate-shaped portion fixed to the vehicle body, a second plate-shaped portion formed to bend relative to the first plate-shaped portion, and a third plate-shaped portion formed to bend relative to the second plate-shaped portion and supporting one end of the damper, A first reinforcing portion is provided on one side of the plate-like portion and fixed to the second plate-like portion and the third plate-like portion, A second reinforcing portion is provided on the other side of the plate-like portion and is fixed to the first plate-like portion and the second plate-like portion, A bonnet structure for a work vehicle equipped with the following.

2. The aforementioned connecting member is A plate-shaped part formed with its longitudinal direction oriented perpendicular to the axial direction of the second pivot shaft, and an adhesive part that is bonded to the bonnet, A connecting portion fixed to the adhesive portion and to which the damper is pivotably connected via the second pivot shaft, Equipped with, The bonnet structure of the work vehicle according to claim 1.

3. The aforementioned adhesive portion is It is formed in an R-shape that bends along the longitudinal direction, The bonnet structure of the work vehicle according to claim 2.

4. The aforementioned connecting portion is Of the fixing portion to the adhesive portion, the side furthest from one end of the damper, with respect to the second pivot axis, is formed to be wider than the side closer to one end of the damper. The bonnet structure of the work vehicle according to claim 2.

5. The aforementioned adhesive is The bonnet and the connecting member are covered with paint for painting, The bonnet structure of the work vehicle according to claim 1.

6. The damper is, Located above the engine, The bonnet structure of the work vehicle according to claim 2.

7. The aforementioned first oscillating shaft is, It is located higher than the radiator. The bonnet structure of the work vehicle according to claim 2.

8. The aforementioned first oscillating shaft is, It is positioned higher than the center of the air cleaner. The bonnet structure of the work vehicle according to claim 2.

9. The damper is, With the hood closed, the following is located above the DPF: The bonnet structure of the work vehicle according to claim 2.

10. The aforementioned support member is Formed to follow the curved surface of the DPF, The bonnet structure of the work vehicle according to claim 9.

11. The aforementioned support member is Connected to the DPF support section for supporting the aforementioned DPF, The bonnet structure of the work vehicle according to claim 9.

12. The aforementioned support member is It is fixed to the engine and has an engaging portion formed therein into which a hook for lifting the engine can engage. The bonnet structure of the work vehicle according to claim 1.

Images