Work vehicles

Abstract

To suppress debris entering from a first opening which allows an arm cylinder to penetrate.SOLUTION: A work vehicle includes a vehicle body frame including: a first inner frame; a first outer frame; and a first connection frame for connecting the first inner frame and the first outer frame and including a first opening. A first arm assembly body is connected to the first inner frame and the first outer frame so as to rotate around a first rotation axis extending in the width direction. A first arm cylinder is arranged so as to pass the first opening by being connected to the first inner frame and the first outer frame so as to rotate around a second rotation axis extending in the width direction. A first cover is provided on the first connection frame, surrounds an outer periphery of the first arm cylinder, and covers the first opening. The first cover is slidable being guided by the first connection frame, a first inner protrusion part provided further upward than the first connection frame out of the first inner frame, and a first outer protrusion part provided further upward than the first connection frame out of the first outer frame.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] Patent Document 1 describes a work vehicle equipped with a flexible boot that covers the hydraulic cylinder that moves the arm up and down and prevents debris from entering through a through hole that passes through the hydraulic cylinder. Patent Document 2 describes a work vehicle with an opening in a side panel of a body frame that can take in outside air. Patent Document 3 describes a cover plate that covers an opening in a side panel of a body frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2012 / 0251282 [Patent Document 2] U.S. Patent No. 9,039,344 [Patent Document 3] Patent No. 6738750 Summary of the Invention [Problem to be solved by the invention]

[0004] The first problem is that the method of Patent Document 1 requires fastening a large number of fasteners (attachment buttons) around the periphery of the boot, making attachment difficult.

[0005] The second problem is that in both Patent Documents 2 and 3, the opening is provided at a position far from the hydraulic cylinder, and the opening cannot be used to clean the area around the hydraulic cylinder. If debris accumulates around the rotation shaft of the hydraulic cylinder, the debris not only gets in the way and inhibits the movement of the hydraulic cylinder when it rotates, but also there is a risk of damaging the hydraulic cylinder. [Means for solving the problem]

[0006] A work vehicle according to a first aspect of the present disclosure includes a vehicle body frame, a first arm assembly, a first arm cylinder, and a first cover. The vehicle body frame includes a first inner frame, a first outer frame, and a first connection frame. The first inner frame extends in a height direction along the height of the work vehicle. The first outer frame is perpendicular to the height direction, faces the first inner frame in a width direction along the width of the work vehicle, and extends in the height direction. The first connection frame connects the first inner frame and the first outer frame and includes a first opening. The first arm assembly is connected to the first inner frame and the first outer frame so as to be rotatable about a first rotation axis extending in the width direction. The first arm cylinder is connected to the first inner frame and the first outer frame so as to be rotatable about a second rotation axis extending in the width direction, and is disposed so as to pass through the first opening, and is configured to drive the first arm assembly by changing a length along a first cylinder central axis extending in a radial direction relative to the second rotation axis. The first cover is provided on the first connection frame, surrounds the outer periphery of the first arm cylinder around the first cylinder central axis, and covers the first opening. The first inner frame includes a first inner protrusion provided higher in the height direction than the first connection frame. The first outer frame includes a first outer protrusion provided higher in the height direction than the first connection frame. The first cover is slidable while being guided by the first inner protrusion, the first outer protrusion, and the first connection frame.

[0007] A work vehicle according to a second aspect of the present disclosure includes a vehicle body frame, a first side cover, a first arm assembly, and a first arm cylinder. The vehicle body frame includes a first inner frame, a first outer frame, and a first connecting frame. The first inner frame extends in a height direction along the height of the work vehicle. The first outer frame is perpendicular to the height direction, faces the first inner frame in a width direction along the width of the work vehicle, and extends in the height direction. The first connecting frame connects the first inner frame and the first outer frame and includes a first opening. The first side cover is detachable from the first outer frame. The first arm assembly is connected to the first inner frame and the first outer frame so as to be rotatable about a first rotation axis extending in the width direction. The first arm cylinder is connected to the first inner frame and the first outer frame so as to be rotatable about a second rotation axis extending in the width direction, and is arranged to pass through the first opening, and is configured to drive the first arm assembly by changing a length along a first cylinder central axis extending in a radial direction relative to the second rotation axis. The first outer frame includes a second opening that communicates a first internal space between the first inner frame and the first outer frame with a first external space opposite the first internal space with respect to the first outer frame. The inner frame includes at least one third opening that communicates the first internal space with an engine room opposite the first internal space with respect to the first inner frame. The second opening overlaps the arm cylinder when viewed in the width direction. Effect of the Invention

[0008] The work vehicle according to the first aspect of the present disclosure is provided with a first cover that prevents debris from entering through the first opening through which the first arm cylinder penetrates, and further, the first cover is easy to attach. The work vehicle according to the second aspect of the present disclosure is provided with a first side cover that can be used not only to take in outside air into the engine room, but also to clean the area around the hydraulic cylinder. When performing mulcher work (work of finely chopping young trees, shrubs, trees, etc. to produce chips) in which debris is likely to enter from above, such a work vehicle is further advantageous as a multi-purpose work vehicle in which it is required to remove the first cover and attach a cover plate instead of the first side cover to prevent debris from entering from the side in work in which debris is likely to enter from the side, and to prevent debris from entering from the side. However, the present invention is not limited to multi-purpose work vehicles, and can also be applied to work vehicles that are simply intended to take in outside air and clean the area around the first arm cylinder, with the sole purpose of preventing debris from entering through the through hole through which the first arm cylinder penetrates. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a work vehicle. [Diagram 2] FIG. 2 is a top view of the work vehicle. [Diagram 3] FIG. 3 is a view of a portion of the work vehicle as viewed from the front end of the work vehicle toward the rear. [Figure 4] FIG. 4 is an enlarged top view of a portion of the work vehicle. [Diagram 5] FIG. 5 is an enlarged top view of a portion of the work vehicle. [Figure 6] FIG. 6 is a left side view of a portion of the work vehicle. [Figure 7] FIG. 7 is a right side view of a portion of the work vehicle. [Figure 8] FIG. 8 is a perspective view of a portion of the work vehicle. [Figure 9] FIG. 9 is a perspective view of a portion of the work vehicle. [Figure 10] FIG. 10 is a perspective view of the first cover. [Figure 11] FIG. 11 is a perspective view of the first cover. [Figure 12] FIG. 12 is a perspective view of the second cover. [Figure 13] FIG. 13 is a perspective view of the second cover. [Figure 14] FIG. 14 is another example of a side view of the work vehicle.

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings showing embodiments thereof. In the drawings, the same reference numerals indicate corresponding or substantially identical components. <Embodiment> <Overall composition>

[0011] 1 and 2, a work vehicle 1, for example, a compact track loader, includes a vehicle body frame 2, a pair of travel devices 3, and a working device 4. The vehicle body frame 2 supports the travel devices 3 and the working device 4. In the illustrated embodiment, the travel devices 3 are crawler-type travel devices. Therefore, each of the pair of travel devices 3 includes a driving wheel 31, driven wheels 32 and 33, and rollers 34 driven by a hydraulic motor device 30. However, each of the pair of travel devices 3 is not limited to a crawler-type travel device. Each of the pair of travel devices 3 may be, for example, a front wheel / rear wheel travel device as shown in FIG. 14, or a travel device having a front wheel and a rear crawler. The working device 4 includes a work implement 41 at the distal end of the working device 4. Although the working device 41 is illustrated as a bucket in FIGS. 1 and 2, the working device 41 is not limited to a bucket, and is more preferably a wood crushing device used for mulcher work. A proximal end of the working device 4 is attached to the rear of the vehicle body frame 2. The working device 4 includes a pair of arm assemblies 42 for swingably supporting a working tool 41 via a working tool pivot shaft 43. Each of the pair of arm assemblies 42 includes a lift link 44 and an arm 45.

[0012] The lift link 44 is rotatable relative to the vehicle body frame 2 around a fulcrum shaft 46. The arm 45 is rotatable relative to the lift link 44 around a joint shaft 47. The working device 4 further includes a plurality of arm cylinders 48 and at least one work implement cylinder 49. Each of the plurality of arm cylinders 48 is provided on the vehicle body frame 2 and the arm 45 in the width direction D. W A second axis of rotation A extending X482, the work vehicle 1 includes a driver's seat 54 in the cabin 5. The cab frame 53 is rotatably connected to the vehicle body frame 2 and raises and lowers the work implement 41. At least one work implement cylinder 49 is configured to tilt the work implement 41 relative to the pair of arm assemblies 42. The vehicle body frame 2 includes a cabin 5. The cabin 5 is provided with a front window 51 that can be opened and closed, and an outer shape thereof is defined by a cab frame 53. The front window 51 may be omitted. The work vehicle 1 includes a driver's seat 54 in the cabin 5. The cab frame 53 is rotatable about rotational shafts RSL and RSR on the vehicle body frame 2, as shown in FIG. 2. In FIG. 1 and FIG. 2, a common pivot A defined by the rotational shafts RSL and RSR is shown. XC That is, the cab frame 53 is rotatable about a rotation axis A XC It is mounted so as to be rotatable around

[0013] In the embodiment of the present application, FB (Forward D F / backward D B ) means the front-rear direction (front direction / rear direction) as seen from the operator seated in the driver's seat 54 of the cabin 5. L , right direction D R , width direction D W The left, right, left and right directions are respectively seen from the operator's point of view. U , downward D D , height direction D H The vertical direction D means the upward, downward, and height directions from the operator's point of view. H is along the height of the work vehicle 1. The front-rear / left-right (width) / up-down (height) directions of the work vehicle 1 respectively correspond to the front-rear / left-right (width) / up-down (height) directions as seen by the operator. W is the height direction D H and along the width of the work vehicle 1. FB is the height direction D H and width direction D W is perpendicular to

[0014] FIG. 1 shows the left side of the work vehicle 1. As shown in FIG. 2, the vehicle body frame 2 is generally symmetrical with respect to the vehicle body central plane M. Of the pair of traveling devices 3, the traveling device 3 provided on the left side is shown as the first traveling device 3L, and the traveling device 3 provided on the right side is shown as the second traveling device 3R. Of the pair of arm assemblies 42, the arm assembly 42 provided on the left side with respect to the vehicle body central plane M is shown as the first arm assembly 42L, and the arm assembly 42 provided on the right side with respect to the vehicle body central plane M is shown as the second arm assembly 42R. The lift link 44 provided on the left side with respect to the vehicle body central plane M is shown as the first lift link 44L. The arm 45 provided on the left side with respect to the vehicle body central plane M is shown as the first arm 45L, and the arm 45 provided on the right side with respect to the vehicle body central plane M is shown as the second arm 45R. The fulcrum shaft 46 provided on the left side with respect to the vehicle body central plane M is shown as the first fulcrum shaft 46L, and the fulcrum shaft 46 provided on the right side with respect to the vehicle body central plane M is shown as the second fulcrum shaft 46R. The joint shaft 47 provided on the left side with respect to the vehicle body central plane M is shown as the first joint shaft 47L, and the joint shaft 47 provided on the right side with respect to the vehicle body central plane M is shown as the second joint shaft 47R. Of the hydraulic motor devices 30, the hydraulic motor device 30 provided on the left side with respect to the vehicle body central plane M is shown as the first hydraulic motor device 30L, and the hydraulic motor device 30 provided on the right side with respect to the vehicle body central plane M is shown as the second hydraulic motor device 30R. In FIG. 1, of the multiple arm cylinders 48, the arm cylinder 48 provided on the left side with respect to the vehicle body central plane M is shown as the first arm cylinder 48L. The first arm cylinder 48L is aligned with the second rotation axis A. X48 A first cylinder central axis A extending in a radial direction with respect to XCYL2, the first arm assembly 42L is driven by changing the length along the axis of the arm 42L to raise and lower the working tool 41. In FIG. 2, of the at least one working tool cylinder 49, the working tool cylinder 49 provided on the left side with respect to the vehicle body central plane M is shown as the first working tool cylinder 49L. Of the at least one working tool cylinder 49, the working tool cylinder 49 provided on the right side with respect to the vehicle body central plane M is shown as the second working tool cylinder 49R. The first working tool cylinder 49L is configured to tilt the working tool 41 with respect to the first arm assembly 42L. The second working tool cylinder 49R is configured to tilt the working tool 41 with respect to the second arm assembly 42R.

[0015] 1 and 2, the work vehicle 1 further includes an engine 6 provided at the rear of the vehicle body frame 2, and a hydraulic pump / valve unit 7. The engine 6 drives the hydraulic pump / valve unit 7. The hydraulic pump / valve unit 7 is configured to discharge hydraulic oil to drive the hydraulic motor device 30 that drives the drive wheels 31, etc. The hydraulic pump / valve unit 7 is configured to discharge hydraulic oil to drive hydraulic actuators (multiple arm cylinders 48, at least one implement cylinder 49, etc.) connected to the work device 4. The multiple arm cylinders 48 and the hydraulic pump / valve unit 7 are connected by multiple arm cylinder hydraulic hoses 52. The hydraulic oil is supplied from the hydraulic pump / valve unit 7 to the oil chambers of the multiple arm cylinders 48 via the multiple arm cylinder hydraulic hoses 52. Specifically, the first arm cylinder 48L and the hydraulic pump / valve unit 7 are connected by a first arm cylinder hydraulic hose 52L. At least one implement cylinder 49 and the hydraulic pump / valve unit 7 are connected by at least one implement cylinder hydraulic hose 50. Specifically, the first implement cylinder 49L and the hydraulic pump / valve unit 7 are connected by at least one first implement cylinder hydraulic hose 50L. The second implement cylinder 49R and the hydraulic pump / valve unit 7 are connected by at least one second implement cylinder hydraulic hose 50R. The engine 6 is arranged in a width direction D of the work vehicle 1. Wand is provided between the pair of arm assemblies 42. The work vehicle 1 further includes a bonnet cover 8 for covering the engine 6. The work vehicle 1 further includes a rear cover 9 provided at the rear end of the body frame 2. The rear cover 9 can be opened and closed to enable a maintenance technician to perform maintenance work on the engine 6, etc.

[0016] FIG. 3 shows a part of the work vehicle 1 from the front end of the work vehicle 1 to the rear D B 3. The pair of traveling devices 3, the cabin 5, the arm 45, and the working tool 41 are omitted from Fig. 3. Referring to Fig. 3, the body frame 2 includes a first inner frame 21L, a second inner frame 21R, a first outer frame 22L, a second outer frame 22R, a first connecting frame 23L, a second connecting frame 23R, an upper frame 24, a lower frame 25, a first track frame 28L, and a second track frame 28R.

[0017] The first inner frame 21L and the second inner frame 21R connect the upper frame 24 and the lower frame 25 and extend in the height direction D H The first outer frame 22L extends in the width direction D W 21L and faces the first inner frame 21L in the height direction D H The second outer frame 22R extends in the width direction D W 21R and faces the second inner frame 21R in the height direction D H The first inner frame 21L and the first outer frame 22L are located on the left side with respect to the vehicle body center plane M. The second inner frame 21R and the second outer frame 22R are located on the right side with respect to the vehicle body center plane M. The first inner frame 21L extends in the width direction D W The second inner frame 21R is located between the first outer frame 22L and the vehicle body center plane M in the width direction D. W 22R and the vehicle body center plane M.

[0018] The first connection frame 23L connects the first inner frame 21L and the first outer frame 22L. The second connection frame 23R connects the second inner frame 21R and the second outer frame 22R. The lower frame 25 connects the lower end of the first inner frame 21L to the lower end of the second inner frame 21R. The upper frame 24 connects the upper end of the first inner frame 21L to the upper end of the second inner frame 21R. The upper frame 24 is arranged in a vertical direction D H The upper frame 24 faces the lower frame 25 at the rear end thereof. The upper frame 24 has a first support portion 27L for rotatably supporting the above-mentioned rotating shaft RSL, and a second support portion 27R for rotatably supporting the above-mentioned rotating shaft RSR. Here, a space surrounded by the cabin 5, the first inner frame 21L, the second inner frame 21R, the upper frame 24, the lower frame 25, the bonnet cover 8, and the rear cover 9 is referred to as an engine compartment 55. In other words, the second inner frame 21R is provided on the opposite side of the engine compartment 55 to the first inner frame 21L.

[0019] The first lift link 44L and the first arm 45L constituting the first arm assembly 42L, and the first arm cylinder 48L that operates the first arm assembly 42L are arranged in the width direction D W The first support shaft 46L supporting the first lift link 44L is provided between the first inner frame 21L and the first outer frame 22L in the width direction D. W 1, and is connected to the first inner frame 21L and the first outer frame 22L. That is, the first arm assembly 42L is aligned along the central axis of the first fulcrum shaft 46L in the width direction D. W A first axis of rotation A extending X46 The second arm assembly 42R is connected to the first inner frame 21L and the first outer frame 22L so as to be rotatable about the axis A. The second lift link 44R and the second arm 45R constituting the second arm assembly 42R, and the second arm cylinder 48R which operates the second arm assembly 42R are arranged in the width direction D W The second lift link 44R is provided between the second inner frame 21R and the second outer frame 22R in the width direction D. WIn other words, the second arm assembly 42R is aligned along the central axis of the second fulcrum shaft 46R in the width direction D. W A first axis of rotation A extending X46 The second arm cylinder 48R is connected to the second inner frame 21R and the second outer frame 22R so as to be rotatable about the second rotation axis A. X48 The frame 21R is connected to the second inner frame 21R and the second outer frame 22R so as to be rotatable around the frame 21R.

[0020] The first track frame 28L is attached to the lower frame 25 via a first mounting frame 29L. The second track frame 28R is attached to the lower frame 25 via a second mounting frame 29R. Driven wheels 32, 33 and rollers 34 are rotatably attached to the first track frame 28L and the second track frame 28R. The driving wheels 31 are supported by the body frame 2. The engine 6 is supported by the lower frame 25 via a damper (not shown). In FIG. 3, the crankshaft A of the engine 6 is shown at 100° in order to determine the orientation of the engine 6. XE The crankshaft A is XE is substantially on the vehicle body center plane M in the front-rear direction D FB extends to.

[0021] FIG. 4 is an enlarged view of an area LA in FIG. 2. FIG. 5 is an enlarged view of an area RA in FIG. 2. In FIG. 4 and FIG. 5, the parts of the first arm assembly 42L except for the first lift link 44L, the parts of the second arm assembly 42R except for the second lift link 44R, the pair of traveling devices 3, the implement cylinder hydraulic hose 50, and the cabin 5 are omitted. Referring to FIG. 4, the first connection frame 23L includes a first opening 23LO. The work vehicle 1 is provided on the first connection frame 23L and includes a first cover 60L that covers the first opening 23LO. The first cover 60L is made of a sheet of an elastic material. Referring to FIG. 5, the second connection frame 23R includes a fourth opening 23RO. The work vehicle 1 is provided on the second connection frame 23R and includes a second cover 60R that covers the fourth opening 23RO. The second cover 60R is made of a sheet of an elastic material.

[0022] FIG. 6 is a left side view of the work vehicle 1 with the first outer frame 22L and the first arm 45L removed. Referring to FIG. 6, the first arm cylinder 48L is arranged to pass through the first opening 23LO. The work vehicle 1 further includes at least one first arm cylinder hydraulic hose 52L connected to the first arm cylinder 48L and passing through the first opening 23LO. At least one first implement cylinder hydraulic hose 50L passes through the first opening 23LO. The first inner frame 21L is lower in the height direction D than the first connection frame 23L. H 4 and 6, the first cover 60L is aligned with the first cylinder central axis A. XCYL The first arm cylinder 48L is surrounded by the outer periphery thereof.

[0023] 7 is a right side view of the work vehicle 1 with the second outer frame 22R and the second arm 45R removed. Referring to FIG. 7, the second inner frame 21R is lower in the height direction D than the second connection frame 23R. HThe work vehicle 1 further includes at least one second arm cylinder hydraulic hose 52R that is connected to the second arm cylinder 48R and passes through the fourth opening 23RO. At least one second implement cylinder hydraulic hose 50R passes through the fourth opening 23RO. The second arm cylinder 48R is disposed so as to pass through the fourth opening 23RO. The second arm cylinder 48R is aligned with the second rotation axis A. X48 A second cylinder central axis A extending radially with respect to XCYR 5 and 7, the second cover 60R is configured to drive the second arm assembly 42R by changing the length along the second cylinder central axis A. XCYR 4, and surrounds the outer periphery of the second arm cylinder 48R.

[0024] Fig. 8 is a perspective view of the work vehicle 1 with the cabin 5, the first arm 45L, and the second arm 45R removed. Fig. 9 is a perspective view of the work vehicle 1 with the cabin 5, the first arm 45L, and the second arm 45R removed, as seen from a different direction than Fig. 8. With reference to Figs. 3, 4, and 9, the first outer frame 22L is lower in the height direction D than the first connection frame 23L. H The first cover 60L is slidable while being guided by the first inner protrusion 21LE, the first outer protrusion 22LE, and the first connection frame 23L. Referring to Figs. 3, 5, and 8, the second outer frame 22R is located lower in the height direction D than the second connection frame 23R. H The second cover 60R includes a second outer protrusion 22RE provided on the upper side. The second cover 60R is slidable while being guided by the second inner protrusion 21RE, the second outer protrusion 22RE, and the second connection frame 23R.

[0025] Fig. 10 is a perspective view of the first cover 60L. Fig. 11 is a perspective view of the first cover 60L seen from a different direction than Fig. 10. Referring to Figs. 10 and 11, the first cover 60L has a first pipe portion 61L, a first cylinder insertion hole 62L, a first cylinder insertion notch 63L, a first hose insertion hole 64L, a first hose insertion notch 65L, a first inner edge 66L, a first outer edge 67L, a first recess 68L, and a first stress dispersion notch 69L. The first pipe portion 61L has a tubular shape and is aligned along the first cylinder central axis A. XCYL The first arm cylinder 48L is configured to surround the outer periphery of the first arm cylinder 48L. The first cylinder insertion hole 62L is provided inside the first pipe portion 61L. As shown in Figs. 4 and 6, the first arm cylinder 48L penetrates the first cylinder insertion hole 62L. The first cylinder insertion notch 63L extends from the sheet end 60EL (first outer edge 67L) of the first cover 60L to the first cylinder insertion hole 62L. The first arm cylinder 48L can be inserted into the first cylinder insertion hole 62L via the first cylinder insertion notch 63L.

[0026] The first hose insertion hole 64L is provided adjacent to the first pipe portion 61L. As shown in FIG. 4 and FIG. 6, at least one first arm cylinder hydraulic hose 52L passes through the first hose insertion hole 64L. The first hose insertion notch 65L extends from the end 60EL (first outer edge 67L) of the sheet of the first cover 60L to the first hose insertion hole 64L. At least one first arm cylinder hydraulic hose 52L can be inserted into the first hose insertion hole 64L through the first hose insertion notch 65L. Referring to FIG. 4, the first inner edge 66L can abut against the first inner frame 21L. That is, when the first cover 60L is attached, the first inner edge 66L may or may not contact the first inner protrusion 21LE, but when the first cover 60L slides, the first inner edge 66L contacts the first inner protrusion 21LE, so that the posture of the first cover 60L during sliding is maintained. The first outer edge 67L can abut against the first outer frame 22L. That is, when the first cover 60L is attached, the first outer edge 67L may or may not contact the first outer protrusion 22LE, but when the first cover 60L slides, the first outer edge 67L contacts the first outer protrusion 22LE, so that the posture of the first cover 60L during sliding is maintained. The first recess 68L is recessed from the first inner edge 66L. Referring to FIG. 8, at least one first implement cylinder hydraulic hose 50L is arranged to pass through the first recess 68L.

[0027] When at least one first tool cylinder hydraulic hose 50L comes into contact with the first cover 60L as the first lift link 44L rotates forward, the first stress dispersing notch 69L splits into two parts from the first stress dispersing notch 69L, and the part contacting the first tool cylinder hydraulic hose 50L bends forward. This makes it possible to prevent the at least one first tool cylinder hydraulic hose 50L from damaging the first cover 60L as the first lift link 44L rotates forward.

[0028] 4 and 6, the work vehicle 1 further includes a first clamp 59L that fastens the outer periphery of the first arm cylinder 48L and the elastic member (first pipe portion 61L) of the first cover 60L around the first cylinder insertion hole 62L. The first arm cylinder 48L is inserted into the first cylinder insertion hole 62L via the first cylinder insertion notch 63L, and the first pipe portion 61L and the first arm cylinder 48L can be fixed by the first clamp 59L.

[0029] Fig. 12 is a perspective view of the second cover 60R. Fig. 13 is a perspective view of the second cover 60R seen from a different direction than Fig. 12. Referring to Figs. 12 and 13, the second cover 60R has a second pipe portion 61R, a second cylinder insertion hole 62R, a second cylinder insertion notch 63R, a second hose insertion hole 64R, a second hose insertion notch 65R, a second inner edge 66R, a second outer edge 67R, a second recess 68R, and a second stress dispersion notch 69R. The second pipe portion 61R has a tubular shape and is aligned along the second cylinder central axis A. XCYR The second arm cylinder 48R is configured to surround the outer periphery of the second arm cylinder 48R. The second cylinder insertion hole 62R is provided inside the second pipe portion 61R. As shown in Figs. 5 and 7, the second arm cylinder 48R penetrates the second cylinder insertion hole 62R. The second cylinder insertion cutout 63R extends from the sheet end 60ER (second outer edge 67R) of the second cover 60R to the second cylinder insertion hole 62R. The second arm cylinder 48R can be inserted into the second cylinder insertion hole 62R via the second cylinder insertion cutout 63R.

[0030] The second hose insertion hole 64R is provided adjacent to the second pipe portion 61R. As shown in FIG. 5 and FIG. 7, at least one second arm cylinder hydraulic hose 52R passes through the second hose insertion hole 64R. The second hose insertion notch 65R extends from the sheet end 60ER (second outer edge 67R) of the second cover 60R to the second hose insertion hole 64R. At least one second arm cylinder hydraulic hose 52R can be inserted into the second hose insertion hole 64R through the second hose insertion notch 65R. Referring to FIG. 5, the second inner edge 66R can abut against the second inner frame 21R. The second outer edge 67R can abut against the second outer frame 22R. The second recess 68R is recessed from the second inner edge 66R. Referring to FIG. 9, at least one second implement cylinder hydraulic hose 50R is arranged to pass through the second recess 68R.

[0031] When at least one second tool cylinder hydraulic hose 50R comes into contact with the second cover 60R as the second lift link 44R rotates forward, the second stress dispersing notch 69R splits into two parts from the second stress dispersing notch 69R, and the part contacting the second tool cylinder hydraulic hose 50R bends forward. This makes it possible to prevent at least one second tool cylinder hydraulic hose 50R from damaging the second cover 60R as the second lift link 44R rotates forward.

[0032] 5 and 7, the work vehicle 1 further includes a second clamp 59R that fastens the outer periphery of the second arm cylinder 48R and the elastic member (second pipe portion 61R) of the second cover 60R around the second cylinder insertion hole 62R. The second arm cylinder 48R is inserted into the second cylinder insertion hole 62R via the second cylinder insertion notch 63R, and the second pipe portion 61R and the second arm cylinder 48R can be fixed by the second clamp 59R. <Engine compartment cooling structure>

[0033] Next, the cooling structure of the engine compartment 55 for cooling the heat generated by the engine 6 will be described. As shown in FIG. 4 and FIG. 5, the bonnet cover 8 has a plurality of perforated panels 8b including upper air vents 8a. That is, the bonnet cover 8 covers the upper part of the engine compartment 55 and has the upper air vents 8a. In FIG. 4, an enlarged view of the area B of the perforated panel 8b is shown in the area B', and the upper air vents 8a shown in the area B' are present throughout the entire area of ​​the perforated panel 8b. The upper air vents 8a preferably have a circular shape when viewed from the front of the perforated panel 8b (in the thickness direction of the perforated panel 8b where the upper air vents 8a penetrate the perforated panel 8b). The diameter of the circle is preferably smaller than the size of the main debris (tree branches, leaves, sawdust) in the mulcher operation.

[0034] 1 and 4, the work vehicle 1 further includes a first side cover 58L that is detachable from the first outer frame 22L. Referring to FIGS. 1, 4, and 6, the first outer frame 22L includes a second opening 22LO that communicates with a first internal space 56L between the first inner frame 21L and the first outer frame 22L and a first external space 57L that is opposite the first internal space 56L with respect to the first outer frame 22L. In FIG. 1, the second opening 22LO on the back side of the first side cover 58L is shown by a dotted line. In FIG. 6, the first outer frame 22L and the first side cover 58L are omitted, so the second opening 22LO is shown by a two-dot chain line. As shown in FIG. 6, the second opening 22LO is formed in a width direction D. WWhen viewed from the front of the first side cover 58L (in the thickness direction of the perforated panel 8b where the upper vent hole 8a penetrates the perforated panel 8b), the perforated panel 58L preferably has a circular shape. The diameter of the circle is preferably smaller than the size of the main debris (tree branches, leaves, sawdust) in the mulcher operation. Referring to FIG. 6, the vehicle body frame 2 is arranged in the height direction D with respect to the first connection frame 23L. H The second opening 22LO is disposed in the height direction D. H In detail, the second opening 22LO is disposed closer to the first bottom frame 26L than the first connection frame 23L. H The distance W1 is the distance in the height direction D between the lower end of the first connection frame 23L and the upper end of the second opening 22LO. H The first inner frame 21L includes at least one third opening 21LO that communicates the first inner space 56L with the engine compartment 55 on the opposite side of the first inner frame 21L from the first inner space 56L. The at least one third opening 21LO is W A third upper opening 21LOT is provided above the second opening 22LO as viewed in the width direction D. W and a third lower opening 21LOB provided below the second opening 22LO when viewed from the outside.

[0035] Referring to FIG. 9, the work vehicle 1 further includes a second side cover 58R that is detachable from the second outer frame 22R. Referring to FIG. 9, FIG. 5, and FIG. 7, the second outer frame 22R includes a fifth opening 22RO that communicates with a second internal space 56R between the second inner frame 21R and the second outer frame 22R and a second external space 57R opposite to the second internal space 56R with respect to the second outer frame 22R. In FIG. 9, the fifth opening 22RO on the back side of the second side cover 58R is shown by a dotted line. In FIG. 7, the second outer frame 22R and the second side cover 58R are omitted, so the fifth opening 22RO is shown by a two-dot chain line. As shown in FIG. 7, the fifth opening 22RO is formed in the width direction D. W When viewed from the front of the first side cover 58L, the second side cover 58R overlaps with the second arm cylinder 48R. The second side cover 58R is made of a perforated panel and is attached so as to cover the fifth opening 22RO as shown in FIG. 9. The second side cover 58R includes a narrow hole 58H in the area overlapping with the fifth opening 22RO, similar to the first side cover 58L. The narrow hole 58H preferably has a circular shape when viewed from the front of the first side cover 58L, and the diameter of the circle is preferably smaller than the size of the main debris (tree branches, leaves, sawdust) in the mulcher operation. Referring to FIG. 7, the vehicle body frame 2 is disposed in the height direction D with respect to the second connection frame 23R. H The fifth opening 22RO is disposed below the second inner frame 21R and the second outer frame 22R. H In detail, the fifth opening 22RO is disposed closer to the second bottom frame 26R than the second connection frame 23R. H The distance W3 is the distance in the height direction D between the lower end of the second connection frame 23R and the upper end of the fifth opening 22RO. H The second inner frame 21R includes at least one sixth opening 21RO that communicates the second inner space 56R with the engine compartment 55 on the opposite side of the second inner frame 21R from the second inner space 56R. The at least one sixth opening 21RO is W A sixth upper opening 21ROT is provided above the fifth opening 22RO as viewed in the width direction D. Wand a sixth lower opening 21ROB provided below the fifth opening 22RO when viewed from the front.

[0036] As shown in FIGS. 1, 2, 6, and 7, the work vehicle 1 is W between the first inner frame 21L and the second inner frame 21R, and further from the first opening 23LO, the second opening 22LO, at least one third opening 21LO, the fourth opening 23RO, the fifth opening 22RO, at least one sixth opening 21RO, and the upper air hole 8a in the height direction D. H and width direction D W D perpendicular to the front-back direction FB 6 to 9, the rear cover 9 is provided behind the fan 71 and has a rear vent 9a. Therefore, when performing mulcher work in which the main debris is tree branches, leaves, and sawdust, the first cover 60L covers the first opening 23LO and the second cover 60R covers the fourth opening 23RO, thereby preventing the intrusion of debris larger than tree branches, leaves, and sawdust through the first opening 23LO and the fourth opening 23RO. In addition, outside air is taken in through the upper vent 8a and the pores 58H, which are smaller in size than tree branches, leaves, and sawdust, to cool the engine room 55, and the warm air can be discharged through the rear vent 9a. Therefore, the engine room 55 can be cooled while preventing the intrusion of debris. On the other hand, during normal excavation work, the possibility of debris entering the engine room 55 from above is low, and instead the debris is small in size, such as soil and pebbles. For this reason, during normal excavation work, the first cover 60L and the second cover 60R are removed, and the first side cover 58L and the second side cover 58R without the fine holes 58H are attached. This allows outside air to be taken in through the first opening 23LO, the fourth opening 23RO, and the upper ventilation hole 8a to cool the engine room 55, and the warm air to be discharged from the rear ventilation hole 9a. At this time, the first side cover 58L and the second side cover 58R without the fine holes 58H prevent the intrusion of debris from the second opening 22LO and the fifth opening 22RO.

[0037] Furthermore, the first cover 60L includes a first cylinder insertion cutout 63L and a first hose insertion cutout 65L, and the first cylinder insertion cutout 63L can be fastened by the first clamp 59L. Therefore, even if the first arm cylinder 48L and at least one first arm cylinder hydraulic hose 52L are always connected to a member that connects them, the first side cover 58L can be attached and removed. Similarly, the second cover 60R includes a second cylinder insertion cutout 63R and a second hose insertion cutout 65R, and the second cylinder insertion cutout 63R can be fastened by the second clamp 59R. Therefore, even if the second arm cylinder 48R and at least one second arm cylinder hydraulic hose 52R are always connected to a member that connects them, the second side cover 58R can be attached and removed. Therefore, the first side cover 58L and the second side cover 58R can be easily attached depending on the work. <Modification>

[0038] In the above embodiment, the components provided on the left side of the vehicle body central plane M are referred to as the first..., and the components provided on the right side of the vehicle body central plane M are referred to as the second.... However, the components provided on the right side of the vehicle body central plane M may be referred to as the first..., and the components provided on the left side of the vehicle body central plane M may be referred to as the second....

[0039] In this application, the term "comprises" and its derivatives are open-ended terms that describe the presence of elements and do not exclude the presence of other elements not listed. This also applies to the terms "have", "include" and their derivatives.

[0040] The terms "member," "part," "element," "body," and "structure" may have multiple meanings, such as a single part or multiple parts.

[0041] Ordinal numbers such as "first" and "second" are merely terms used to identify components and do not have any other meaning (such as a particular order). For example, the presence of a "first element" does not imply the presence of a "second element," and the presence of a "second element" does not imply the presence of a "first element."

[0042] Words expressing degree, such as "substantially," "about," and "approximately," may mean a reasonable deviation that does not significantly change the final result, unless otherwise specified in the embodiment. All numerical values ​​described in this application may be interpreted to include words such as "substantially," "about," and "approximately."

[0043] In this application, the phrase "at least one of A and B" should be interpreted as including A only, B only, and both A and B.

[0044] It is apparent that various changes and modifications of the present invention are possible in light of the above disclosure, and therefore, the present invention may be practiced otherwise than as specifically disclosed herein without departing from the spirit and scope of the present invention.

Claims

1. a first inner frame extending in a height direction along the height of the work vehicle; a first outer frame that is perpendicular to the height direction, faces the first inner frame in a width direction along the width of the work vehicle, and extends in the height direction; a first connection frame that connects the first inner frame and the first outer frame and includes a first opening; A vehicle body frame including: a first arm assembly connected to the first inner frame and the first outer frame so as to be rotatable about a first rotation axis extending in the width direction; a first arm cylinder connected to the first inner frame and the first outer frame to be rotatable about a second rotation axis extending in the width direction, disposed to pass through the first opening, and configured to drive the first arm assembly by changing a length along a first cylinder central axis extending in a radial direction relative to the second rotation axis; a first cover provided on the first connection frame, surrounding an outer periphery of the first arm cylinder around the first cylinder central axis, and covering the first opening; Equipped with the first inner frame includes a first inner protrusion provided above the first connection frame in the height direction, the first outer frame includes a first outer protrusion provided above the first connection frame in the height direction, The first cover is slidable while being guided by the first inner protrusion, the first outer protrusion, and the first connection frame. Work vehicle.

2. The first cover is made of a sheet of elastic material. A work vehicle according to claim 1.

3. The first cover is a first cylinder insertion hole through which the first arm cylinder passes; a first cylinder insertion notch extending from an end of the sheet of the first cover to the first cylinder insertion hole; having the work vehicle further includes a first clamp that fastens the outer periphery of the first arm cylinder and the elastic member of the first cover around the first cylinder insertion hole, The work vehicle according to claim 2.

4. at least one first arm cylinder hydraulic hose connected to the first arm cylinder and extending through the first opening; The first cover is a first hose insertion hole through which the at least one first arm cylinder hydraulic hose passes; a first hose insertion notch extending from an end of the sheet of the first cover to the first hose insertion hole; The work vehicle according to claim 3 .

5. a working tool supported by the first arm assembly so as to be capable of swinging; a first implement cylinder configured to tilt the implement relative to the first arm assembly; and at least one first implement cylinder hydraulic hose connected to the first implement cylinder and extending through the first opening; Further equipped with The first cover is A first inner edge capable of contacting the first inner frame; a first recess recessed from the first inner edge; and The work vehicle according to claim 2 , wherein the at least one first implement cylinder hydraulic hose is arranged to pass through the first recess.

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