Work vehicles
By designing the dust intrusion prevention mechanism in the working vehicle, the use of multi-layer boards and elastic elements to form narrow passages, the problem of dust entering the engine compartment is solved, and effective pollution prevention and mechanical failure reduction is achieved.
Patent Information
- Application Number
- JP2022083891
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-05-23
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2042-05-23
AI Technical Summary
In a working vehicle, the gap between the cabin and the body makes it easy for dust to enter the engine compartment, causing contamination and mechanical failure.
A dust intrusion prevention mechanism is designed to prevent dust from entering by setting the first and second dust intrusion prevention mechanism between the body and the cabin, using multi-layer boards and elastic elements to form narrow passages, covering the gap between the cabin and the cabin, thereby preventing dust from entering.
It effectively prevents dust from entering the engine compartment through the gap between the cabin and the body, reducing the risk of mechanical pollution and failure.
Smart Images
Figure 0007662573000001 
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Figure 0007662573000003
Abstract
Description
[Technical field]
[0001] The present invention relates to a work vehicle. [Background technology]
[0002] Patent Document 1 shows a work vehicle with a cabin that can be opened and closed freely. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Patent No. 5314177 Summary of the Invention [Problem to be solved by the invention]
[0004] In the work vehicle of Patent Document 1, it is preferable to provide a gap between the vehicle body frame and the cabin for ease of opening and closing the cabin. However, there is a risk of dust entering through the gap. [Means for solving the problem]
[0005] A work vehicle according to a first aspect of the present disclosure includes a body frame having a body front and a body rear opposite to the body front, a cab frame connected to the body frame rotatably around a cab rotation axis, and a first dust intrusion prevention mechanism provided between the body frame and the cab frame. The body rear is provided at a position off the body center, which is the center of the body frame in the axial direction along the cab rotation axis, and has a first support base that rotatably supports the cab frame, an upper support frame that supports the first support base, and an engine room below the upper support frame in the height direction along the height of the body frame. The upper support frame has a first end at a position axially outwardly away from the body center than the first support base, and the upper support frame and the cab frame are separated in a closed state in which the cab frame is placed on the body front. The cab frame has a cover that covers the upper support frame between the body center in the axial direction and the first support base at an upper part in the height direction. The first dust intrusion prevention mechanism is located axially between the center of the vehicle body and the first support base, and vertically between the upper support frame and the cover, and overlaps with the gaps between the cab frame, the upper support frame, the first support base, and the cover when viewed in the axial direction.
[0006] A work vehicle according to a second aspect of the present disclosure includes a body frame having a body front and a body rear opposite to the body front, a cab frame connected to the body frame so as to be rotatable about a cab rotation axis, and a first dust intrusion prevention mechanism provided between the body frame and the cab frame. The rear body has a first support base and a second support base that rotatably support the cab frame and are arranged side by side in the axial direction, an upper support frame that supports the first support base and the second support base, and an engine room provided below the upper support frame in a height direction along the height of the body frame. In a closed state in which the cab frame is placed on the body front, the upper support frame and the cab frame are spaced apart. The cab frame has a cover that covers the upper support frame between the first support base and the second support base in the axial direction, at an upper part in the height direction. The first dust intrusion prevention mechanism is provided between the first support base and the second support base in the axial direction and between the upper support frame and the cover in the vertical direction, and overlaps with the gaps between the cab frame, the upper support frame, the first support base and the cover when viewed in the axial direction. Effect of the Invention
[0007] According to the technology disclosed in the present application, for example, a work vehicle can be provided in which the central portion covered with a cover prevents dust from entering the engine compartment through the gap between the upper support frame and the cabin. [Brief description of the drawings]
[0008] [Figure 1] FIG. 1 is a side view of a work vehicle. [Diagram 2] FIG. 2 is a side view of the work vehicle when the cabin is rotated. [Diagram 3] FIG. 3 is a top view of the work vehicle. [Figure 4] FIG. 4 is a rear view of the work vehicle. [Diagram 5] FIG. 5 is a view of a portion of the work vehicle as viewed from the front end of the work vehicle toward the rear. [Figure 6] FIG. 6 is a side view of the engine and its surroundings. [Figure 7] FIG. 7 is a perspective view of the heat exchanger as viewed from above with the bonnet cover removed. [Figure 8] FIG. 8 is an enlarged view of the boundary portion between the cabin and the bonnet cover. [Figure 9] FIG. 9 is an enlarged view of the vicinity of the upper support frame in FIG. 5 according to the first embodiment. [Figure 10] FIG. 10 is an enlarged view of the upper portion near the upper support frame of FIG. 5 according to the first embodiment. [Figure 11] FIG. 11 is a cross-sectional view taken along the line XI-XI' of FIG. 3 according to the first embodiment. [Figure 12] FIG. 12 is an enlarged view of the vicinity of the upper support frame of the second embodiment. [Figure 13] FIG. 13 is an enlarged view of the upper part near the upper support frame of the second embodiment. [Figure 14] FIG. 14 is a cross-sectional view taken along the line XI-XI' of FIG. 3 in the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] 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. First Embodiment <Overall composition>
[0010] 1 to 4, a work vehicle 1, for example, a compact track loader, includes an exhaust system 10. The work vehicle 1 includes a vehicle body frame 2, a traveling device 3, a working device 4, and a cabin 5. The vehicle body frame 2 supports the traveling device 3, the working device 4, and the cabin 5. In the illustrated embodiment, the traveling device 3 is a crawler-type traveling device. Therefore, the traveling device 3 includes a driving wheel 31, driven wheels 32 and 33, and a roller 34. However, the traveling device 3 is not limited to a crawler-type traveling device. The vehicle body frame 2 has a vehicle body front part 2F and a vehicle body rear part 2R opposite to the vehicle body front part 2F. The traveling device 3 may be, for example, a front wheel / rear wheel traveling device, or a traveling device having front wheels and a rear crawler. The working device 4 includes a work equipment (bucket) 41 at the distal end of the working device 4. A proximal end of the working device 4 is attached to the vehicle body rear part 2R of the vehicle body frame 2. The working device 4 includes a pair of arm assemblies 42 for rotatably supporting a bucket 41 via a bucket pivot shaft 43. Each of the pair of arm assemblies 42 includes a lift link 44 and an arm 45.
[0011] 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 equipment cylinder 49. Each of the plurality of arm cylinders 48 is rotatably connected to the vehicle body frame 2 and the arm 45, and moves the lift link 44 and the arm 45 to lift and lower the bucket 41. The at least one equipment cylinder 49 is configured to tilt the bucket 41.
[0012] The cabin 5 is attached to the vehicle body front portion 2F of the vehicle body frame 2. The work vehicle 1 is provided with a front door 51 in front of the cabin 5, and a driver's seat 52 and an operating device (not shown) are provided inside the cabin 5. The interior space of the cabin 5 is defined by a cab frame 53. As shown in Figs. 2 and 3, the cab frame 53 includes rotational shafts RSL and RSR. The vehicle body rear portion 2R of the vehicle body frame 2 has a first support base 27L that rotatably supports the rotational shaft RSL, and a second support base 27R that rotatably supports the above-mentioned rotational shaft RSR. In Figs. 1 to 3, a common cab rotational axis A defined by the rotational shafts RSL and RSR is shown. XC In the following embodiments, the cab rotation axis A XC The direction along the axis D AX The cab frame 53 is connected to the vehicle body frame 2 so as to be rotatable about the cab rotation axis. With reference to Figs. 1 and 2, the cab frame 53 can be switched between a closed state (see Fig. 1) in which it is placed on the vehicle body front part 2F and an open state (see Fig. 2) in which it is separated from the vehicle body front part 2F by rotating about the rotating shafts RSL and RSR. In Fig. 2, in order to clarify the structure of the vehicle body frame 2, the vehicle body frame 2, the cabin 5, and a first dust intrusion prevention mechanism 60 and a second dust intrusion prevention mechanism 65, which will be described later, are not shown.
[0013] In the embodiment of the present application, FB (Forward direction 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 52 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 HThe width direction D means the upward, downward, and height directions as seen from the operator. The front-rear, left-right (width), and up-down (height) directions of the work vehicle 1 respectively correspond to the front-rear, left-right (width), and up-down (height) directions as seen from the operator. In this embodiment, the width direction D W is the axial direction D AX is equivalent to.
[0014] In FIG. 3, one of the pair of arm assemblies 42 is provided on the left side of the cabin 5. The other of the pair of arm assemblies 42 is provided on the right side of the cabin 5. More specifically, one of the arm cylinders 48 and one of the arms 45 are provided on the left side of the cabin 5. The other of the arm cylinders 48 and the other of the arms 45 are provided on the right side of the cabin 5. FIG. 1 shows the left side of the work vehicle 1. As shown in FIGS. 3 and 4, the vehicle body frame 2 is substantially plane-symmetrical with respect to the vehicle body central plane M, and of the pair of arm assemblies 42, the arm assembly 42 provided on the left side of the vehicle body central plane M is shown as the first arm assembly 42L, and the arm assembly 42 provided on the right side of the vehicle body central plane M is shown as the second arm assembly 42R. The lift link 44 provided on the left side of the vehicle body central plane M is shown as the first lift link 44L, and the lift link 44 provided on the right side of the vehicle body central plane M is shown as the second lift link 44R. The arm 45 provided on the left side with respect to the vehicle body central plane M is shown as a first arm 45L, and the arm 45 provided on the right side with respect to the vehicle body central plane M is shown as a second arm 45R. The fulcrum shaft 46 provided on the left side with respect to the vehicle body central plane M is shown as a 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 a 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 a 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 a second joint shaft 47R.
[0015] Referring to FIG. 1, the work vehicle 1 further includes an engine 6 and a heat exchanger 7 provided on the vehicle body rear portion 2R of the vehicle body frame 2. The engine 6 is configured to provide driving force to the traveling device 3 and the working device 4. The heat exchanger 7 includes a radiator that cools a coolant of the engine 6. Furthermore, preferably, the heat exchanger 7 includes an oil cooler configured to cool hydraulic oil used in the hydraulic system of the work vehicle 1 (e.g., the arm cylinder 48 and at least one tool cylinder 49). The work vehicle 1 includes a fan 17 for air-cooling the heat exchanger 7. The engine 6 and the heat exchanger 7 are arranged in a width direction D of the work vehicle 1. W 3, the arm assembly 42 is disposed between the pair of arm assemblies 42.
[0016] The work vehicle 1 further includes a bonnet cover 8 for covering the heat exchanger 7. The bonnet cover 8 further covers the engine 6. An air suction port 8a for taking air into the cover 8 is provided on the upper surface of the bonnet cover 8. The work vehicle 1 further includes a rear bonnet cover 9 provided at the rear end of the body frame 2. The rear bonnet cover 9 can be opened and closed, allowing a maintenance technician to perform maintenance work on the engine 6, etc.
[0017] The exhaust system 10 includes an exhaust pipe 11, one end of which is connected to the engine 6, and an exhaust port 12 connected to the exhaust pipe 11. More specifically, the exhaust pipe 11 is connected to the engine 6 via an exhaust treatment device 15 configured to treat exhaust from the engine 6. The exhaust treatment device 15 includes, for example, a particulate removal filter. However, the exhaust treatment device 15 may also include a selective catalytic reduction device. Referring to FIG. 3, the exhaust system 10 is arranged in a width direction D of the work vehicle 1. W 42L and the vehicle body central plane M.
[0018] FIG. 5 shows a part of the work vehicle 1 from the front end of the work vehicle 1 to the rear D B5 is a view seen toward the rear of the vehicle. In Fig. 5, illustrations are omitted other than the vehicle body frame 2, the engine 6, the exhaust treatment device 15, the exhaust system 10, the heat exchanger 7, the fan 17, and the bonnet cover 8. Referring to Fig. 5, the vehicle body frame 2 (vehicle body rear portion 2R) includes a first inner wall 21L, a second inner wall 21R, a first outer wall 22L, a second outer wall 22R, a first rear wall 23L, a second rear wall 23R, an upper support frame 24, a bottom wall 25, a first support base 27L, a second support base 27R, a first track frame 28L, a second track frame 28R, a first mounting frame 29L, and a second mounting frame 29R.
[0019] The first inner wall 21L and the second inner wall 21R connect the upper support frame 24 and the bottom wall 25 and extend in the height direction D H The first outer wall 22L extends in the width direction D W 21L and in the height direction D H The second outer wall 22R extends in the width direction D W 21R and faces the second inner wall 21R in the height direction D H The first inner wall 21L and the first outer wall 22L are located on the left side with respect to the vehicle body center plane M. The second inner wall 21R and the second outer wall 22R are located on the right side with respect to the vehicle body center plane M. The first inner wall 21L extends in the width direction D W The second inner wall 21R is located between the first outer wall 22L and the vehicle body center plane M in the width direction D. W 2. The first rear wall 23L connects the rear end of the first inner wall 21L to the rear end of the first outer wall 22L. The second rear wall 23R connects the rear end of the second inner wall 21R to the rear end of the second outer wall 22R. The bottom wall 25 connects the lower end of the first inner wall 21L to the lower end of the second inner wall 21R. The upper support frame 24 connects the upper end of the first inner wall 21L to the upper end of the second inner wall 21R. The upper support frame 24 is disposed in the height direction D. H The upper support frame 24 supports a first support base 27L and a second support base 27R. The first support base 27L and the second support base 27R support the cab frame 53 so as to be rotatable in the axial direction D. AX The first support base 27L is arranged in the axial direction D AXThe upper support frame 24 is provided at a position away from the vehicle body center M, which is the center of the vehicle body frame 2 in the vehicle body 2, and rotatably supports the cab frame 53. AX and a second end 24E2 opposite thereto in the axial direction D AX The first support base 27L is supported between the first end 24E1 and the second end 24E2 of the support base 27R in the axial direction D. AX and the second end 24E2 at the cab frame 53, and rotatably supports the cab frame 53. The first support base 27L and the second support base 27R are supported by the upper support frame 24 at positions symmetrical with respect to the center M of the vehicle body.
[0020] The first lift link 44L, the first arm assembly 42L, and the arm cylinder 48 that operates the first arm assembly 42L are arranged in the width direction D W The first lift link 44R, the second arm assembly 42R, and the arm cylinder 48 that operates the second arm assembly 42R are disposed between the first inner wall 21L and the first outer wall 22L at the width direction D. W A second fulcrum shaft 46R supporting the second lift link 44R is connected to the second inner wall 21R and the first outer wall 22L.
[0021] The first track frame 28L is attached to the lower end of the first inner wall 21L via a first mounting frame 29L. The second track frame 28R is attached to the lower end of the second inner wall 21R 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 first inner wall 21L and the second inner wall 21R. The engine 6 is supported by the bottom wall 25 via a damper (not shown). In FIG. 4, the crankshaft A of the engine 6 is rotated in a direction perpendicular to the axis of the shaft 31 in order to determine the orientation of the engine 6. XE The crankshaft A is shown. XEis substantially on the vehicle body center plane M in the front-rear direction D FB extends to.
[0022] 6 is a side view of the periphery of the engine 6 shown in FIG. 5. In FIG. 6, the configuration belonging to the cabin 5 is shown by a two-dot chain line, and the body frame 2 is omitted from the illustration except for the upper support frame 24. The upper support frame 24 is shown by a dotted line. Furthermore, the structure of the engine 6 is shown diagrammatically, and the illustration of some of the structure of the engine 6 is omitted. As shown in FIG. 6, the heat exchanger 7, the fan 17, and the bonnet cover 8 are attached to the first inner wall 21L and the second inner wall 21R via the stays 30. In other words, the bonnet cover 8 is arranged in a height direction D along the height of the body frame 2. H 2, 5 and 6, the upper support frame 24 has an L-shape bent downward at its front end. The upper support frame 24 has a through hole 24h, and the exhaust pipe 11 is disposed to pass through the through hole 24h. The through hole 24h communicates with the engine room 14 via a gap G0.
[0023] Further, referring to FIGS. 5 and 6, the fan 17 is disposed above the engine D. U The heat exchanger 7 is located above the fan 17. U The bonnet cover 8 having the air suction port 8a is located above the heat exchanger 7. U The fan 17 is located at the engine 6. As the fan 17 rotates, air is sent from the air suction port 8a to the heat exchanger 7. A fan duct 18 is provided between the fan 17 and the engine 6, and the fan duct 18 prevents the air that has passed through the heat exchanger 7 and been warmed from flowing into the engine room 14. The fan duct 18 also prevents outside air containing dust from flowing into the engine room 14. In FIGS. 5 and 6, some of the fan ducts 18 are not shown, so the fan 17 is shown, but in reality, the fan 17 is covered by the fan duct 18 and is not exposed to the engine room 14.
[0024] FIG. 7 is a perspective view of the heat exchanger 7 seen from above when the bonnet cover 8 is removed. Referring to FIGS. 6 and 7, the heat exchanger 7 is connected to hoses 19 and 20 that connect to the engine 6 and the hydraulic system. A refrigerant and a hydraulic oil are circulated between the heat exchanger 7 and the engine 6 and the hydraulic system through the hoses 19 and 20. The hose 19 extends toward the gap G0 through an opening 30h1 provided in the stay 30. The hose 20 extends toward the gap G0 through an opening 30h2 provided in the stay 30. The work vehicle 1 includes a seal 35 that closes the opening 30h1 and a seal 36 that closes the opening 30h2. The seals 35 and 36 prevent dust accumulated in the space surrounded by the stay 30 from falling into the engine room 14.
[0025] The engine room 14 refers to a space surrounded by the cabin 5, the fan duct 18, the first inner wall 21L, the second inner wall 21R, the bottom wall 25, and the rear bonnet cover 9. In other words, the bonnet cover 8 covers the engine room 14, and the rear part 2R of the vehicle body is a space surrounded by the cabin 5, the fan duct 18, the first inner wall 21L, the second inner wall 21R, the bottom wall 25, and the rear bonnet cover 9. H In this embodiment, it can be said that the engine room 14 is located below the upper support frame 24. When the vehicle is in the open state as shown in Fig. 2, the lower part of the upper support frame 24 shown in Fig. 5 is exposed to the outside. That is, in the open state, the engine room 14 is exposed between the vehicle body front part 2F and the cab frame 53. The engine 6 and the exhaust treatment device 15 are provided in the engine room 14.
[0026] The exhaust treatment device 15 is disposed in the engine compartment 14 in front of the engine 6. F1 and is connected to the engine 6 by a connecting pipe 16. The connecting pipe 16 is connected to the right end of the exhaust treatment device 15. As shown in FIG. 5, the air intake port of the exhaust pipe 11 is connected to the left end of the exhaust treatment device 15. An exhaust port 12 is provided on the opposite side of the air intake port of the exhaust pipe 11. The exhaust port 12 is fixed to the exhaust pipe 11 by a method such as press fitting, adhesive, or welding. That is, the exhaust pipe 11 has the exhaust port 12. As shown in FIG. 5 and FIG. 6, the exhaust port 12 is protected by being covered by the muffler cover 13. That is, the exhaust system 10 includes the muffler cover 13. The muffler cover 13 is fixed to the bonnet cover 8 by bolts B1, B2, etc. As shown in FIG. 3 and FIG. 6, the exhaust port 12 faces the air suction port 8a.
[0027] FIG. 8 is an enlarged view of the boundary portion between the cabin 5 and the bonnet cover 8. With reference to FIGS. 6 and 8, in a closed state in which the cab frame 53 is placed on the vehicle body front portion 2F, the upper support frame 24 and the cab frame 53 are spaced apart. That is, in the work vehicle 1, a first gap G1 is provided between the upper support frame 24 and the cab frame 53. When rotating the cabin 5, the worker can lift the cabin 5 by inserting his / her hand into the first gap G1. With reference to FIGS. 3 and 8, the work vehicle 1 has a cover CV that covers the upper support frame 24 between the first support stand 27L and the second support stand 27R. That is, the cover CV is spaced apart from the upper support frame 24 in the height direction D. H Above the axial direction D AX The cover CV covers the upper support frame 24 between the vehicle body center M and the first support base 27L in the height direction D. H Above the axial direction D AXThe cover CV covers the upper support frame 24 between the vehicle body center M and the second support base 27R at the closed state. Therefore, the cover CV covers the gap between the cab frame 53 and the upper support frame 24 between the first support base 27L and the second support base 27R. The cover CV is made of cloth and is configured to bend when the cabin 5 is rotated. With reference to Figures 2 and 6, the cabin 5 has outer peripheral seals 54L, 54R on the outer periphery of its bottom. The outer peripheral seals 54L, 54R are arranged so as to abut against the extensions 21LE and 21RE extending from the first inner wall 21L and the second inner wall 21R in Figure 5 in the closed state. Therefore, the first gap G1 is formed in the axial direction D of the cover CV. AX and in the front-rear direction D of the extension portions 21LE and 21RE. FB Located at the rear of the <Dust intrusion prevention mechanism>
[0028] The work vehicle 1 is equipped with a first dust intrusion prevention mechanism 60 and a second dust intrusion prevention mechanism 65. The first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65 are provided between the vehicle body frame 2 and the cab frame 53. Fig. 9 is an enlarged view of the vicinity of the upper support frame 24 in Fig. 5 according to the first embodiment. Fig. 10 is an enlarged view of the upper part of the vicinity of the upper support frame 24 in Fig. 5 according to the first embodiment. In Fig. 10, the cover CV is omitted from illustration. Referring to Figs. 5, 9 and 10, the first dust intrusion prevention mechanism 60 is arranged in the axial direction D AX Between the first support stand 27L and the second support stand 27R and in the height direction D H The second dust intrusion prevention mechanism 65 is provided between the upper support frame 24 and the cover CV in the axial direction D. AX Between the first dust intrusion prevention mechanism 60 and the second support base 27R and in the height direction D H In other words, the first dust intrusion prevention mechanism 60 is provided between the upper support frame 24 and the cover CV in the axial direction D AX Between the vehicle body center M and the first end 24E1 and in the height direction D H The second dust intrusion prevention mechanism 65 is provided between the upper support frame 24 and the cover CV in the axial direction D. AXBetween the vehicle body center M and the second end 24E2 and in the height direction D H 2, the upper support frame 24 is provided between the upper support frame 24 and the cover CV.
[0029] The first dust intrusion prevention mechanism 60 has a second lower plate member 61, a third lower plate member 62, an elastic member 63, and an additional elastic member 64. The second dust intrusion prevention mechanism 65 has a second lower plate member 66, a third lower plate member 67, an elastic member 68, and an additional elastic member 69. FB The difference in length between the third lower plate members 62 and 67 in the front-rear direction D FB The difference in length and the front-rear direction D of the elastic members 63 and 68 FB Except for the difference in length, the second lower plate material 61, the third lower plate material 62, the elastic member 63, and the additional elastic member 64 have the same structures as the second lower plate material 66, the third lower plate material 67, the elastic member 68, and the additional elastic member 69, respectively. Therefore, in the following explanation, the structure of the second dust intrusion prevention mechanism 65 will be mainly described, and a detailed explanation of the structure of the overlapping first dust intrusion prevention mechanism 60 will be omitted.
[0030] 11 is a cross-sectional view of the first embodiment taken along the line XI-XI' in FIG. 3. Referring to FIG. 9 and FIG. 11, the second lower plate member 66 (61) is provided on the upper support frame 24 and is spaced apart from the upper support frame 24 in the height direction D. H The third lower plate 67 (62) includes a bottom portion BT connected to the second lower plate 66 (61), and an upper portion TP that bends and extends upward from the bottom portion BT so as to be separated from the second lower plate 66 (61). The second lower plate 66 (61) and the third lower plate 67 (62) are spaced apart from the cover CV in the height direction D. H The elastic member 68 (63) is sandwiched between the second lower plate member 66 (61) and the third lower plate member 67 (62). The elastic member 68 (63) abuts against the cover CV in the closed state. Note that FIG. 11 illustrates the shape of the cover CV in the closed state. Referring to FIGS. 9 to 11, the additional elastic member 69 (64) is disposed in the height direction D of the second lower plate member 66 (61). H And axial direction D AX D perpendicular to the front-back direction FB6 and 11, the additional elastic member 69 (64) abuts against the cab frame 53 in the closed state.
[0031] 6, the cab frame 53 includes a support plate 53EL that supports the rotating shaft RSL. AX 9 and 10, the first dust intrusion prevention mechanism 60 and the first support base 27L are arranged in the axial direction D. AX 11, the cab frame 53 includes a support plate 53ER that supports the rotating shaft RSR. The second dust intrusion prevention mechanism 65 is adjacent to the support plate 53ER in the axial direction D AX 11, the second dust intrusion prevention mechanism 65 and the second support base 27R are arranged in a direction parallel to the axial direction D. In FIG. 11, in order to clearly show the outer shapes of the cab frame 53 and the second support base 27R, the second dust intrusion prevention mechanism 65 and the second support base 27R are arranged in a direction parallel to the axial direction D. AX The second dust intrusion prevention mechanism 65 and the second support base 27R are adjacent to each other in the axial direction D AX The distance L2 is substantially the distance in the axial direction D between the first dust intrusion prevention mechanism 60 and the first support base 27L. AX is equal to the distance L1.
[0032] 10 and 11, the vehicle body frame 2 is supported by the upper support frame 24 in the height direction D. H The third lower plate member 67 (62) further includes an extension frame 26 that extends above the cover CV and is connected to the cover CV. FB The rear end of the exhaust treatment device 15 is connected to the extension frame 26. Referring to FIG. AX5, the exhaust treatment device 15 is located between the first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65. This makes it difficult for dust from the outside air to reach the exhaust treatment device 15. More specifically, while dust from the outside air falls as shown by flow F1 in Fig. 5, dust heading toward the inside of the vehicle as shown by flow F2 is blocked by the first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65. This reduces the risk of the dust burning due to the high heat generated by the exhaust treatment device 15. <Actions and Effects of the First Embodiment>
[0033] In the work vehicle 1 according to the first embodiment, the first dust intrusion prevention mechanism 60 (the second dust intrusion prevention mechanism 65) is AX , it overlaps with the gap G2 between the cab frame 53, the upper support frame 24, the first support base 27L (second support base 27R), and the cover CV. This makes it possible to prevent dust from entering the work vehicle 1 through the gap between the upper support frame 24 and the cabin 5 in the portion covered with the cover CV.
[0034] The axial direction D between the first dust intrusion prevention mechanism 60 and the first support base 27L AX The distance L1 is the axial direction D of the first support base 27L. AX The axial width D between the second dust intrusion prevention mechanism 65 and the second support base 27R is shorter than the width W1 of the second dust intrusion prevention mechanism 65. AX The distance L2 is the axial direction D of the second support base 27R. AX The width W2 of the upper support frame 24 is shorter than the width W3 of the upper support frame 24. The first dust intrusion prevention mechanism 60 and the first support base 27L approach each other, and the second dust intrusion prevention mechanism 65 and the second support base 27R approach each other, thereby narrowing the air passage, and thus it is possible to further prevent dust from invading through the gap between the upper support frame 24 and the cabin 5 in the portion covered by the cover CV.
[0035] The first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65 are both arranged in the front-rear direction D FBThe cover CV includes a third lower plate member 67 (62) connected to the extension frame 26 at its rear end, an elastic member 68 (63) that abuts against the cover CV in the closed state, and an additional elastic member 69 (64) that abuts against the cab frame 53 in the closed state. This makes it possible to close most of the gap surrounded by the cab frame 53, the upper support frame 24, the extension frame 26, and the cover CV in the closed state, thereby further preventing dust from entering through the gap between the upper support frame 24 and the cabin 5 in the portion covered by the cover CV. <Second embodiment>
[0036] The shapes of the first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65 are not limited to the shapes shown in the first embodiment. Hereinafter, another configuration of the first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65 will be described as the first dust intrusion prevention mechanism 70 and the second dust intrusion prevention mechanism 75. The work vehicle 1 according to the second embodiment has the same configurations other than the first dust intrusion prevention mechanism 70 and the second dust intrusion prevention mechanism 75, so the description of those configurations will be omitted. In addition, the configurations of the first dust intrusion prevention mechanism 70 and the second dust intrusion prevention mechanism 75 that were not described in the second embodiment are the same as the configurations of the first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65 in the first embodiment.
[0037] Fig. 12 is an enlarged view of the vicinity of the upper support frame 24 in the second embodiment. Fig. 13 is an enlarged view of the upper part in the vicinity of the upper support frame 24 in the second embodiment. In Fig. 13, the cover CV is omitted. Fig. 14 is a cross-sectional view of the second embodiment taken along the cutting line XI-XI' in Fig. 3. The first dust intrusion prevention mechanism 70 has a first lower plate material 71 and a first upper plate material 72. The second dust intrusion prevention mechanism 75 has a first lower plate material 76 and a first upper plate material 77. The front-rear direction D of the first lower plate materials 71, 76 FBExcept for the difference in length, the first lower plate material 71 and the first upper plate material 72 have the same structure as the first lower plate material 76 and the first upper plate material 77, respectively. Therefore, in the following description, the structure of the second dust intrusion prevention mechanism 75 will be mainly described, and a detailed description of the overlapping structure of the first dust intrusion prevention mechanism 70 will be omitted. In addition, in Fig. 14, in order to clarify the outer shapes of the cab frame 53, the second support base 27R, and the first upper plate material 72, the hidden lines of the outer shape of the cab frame 53 (support plate 53ER) are shown with dotted lines, the hidden lines of the outer shape of the second support base 27R are shown with dashed lines, and the hidden lines of the outer shape of the first upper plate material 72 are shown with dashed lines.
[0038] 14, the first dust intrusion prevention mechanism 70 and the second dust intrusion prevention mechanism 75 are provided between the vehicle body frame 2 and the cab frame 53. Referring to FIG. 12 and FIG. 13, the first dust intrusion prevention mechanism 70 is arranged in the axial direction D AX Between the first support stand 27L and the second support stand 27R and in the height direction D H The second dust intrusion prevention mechanism 75 is provided between the upper support frame 24 and the cover CV in the axial direction D. AX Between the first dust intrusion prevention mechanism 60 and the second support base 27R and in the height direction D H In other words, the first dust intrusion prevention mechanism 70 is provided between the upper support frame 24 and the cover CV in the axial direction D AX Between the vehicle body center M and the first end 24E1 and in the height direction D H The second dust intrusion prevention mechanism 75 is provided between the upper support frame 24 and the cover CV in the axial direction D. AX Between the vehicle body center M and the second end 24E2 and in the height direction D H 2, the upper support frame 24 is provided between the upper support frame 24 and the cover CV.
[0039] 12 and 14, the first upper plate member 72 is AX The first upper plate 77 is disposed between the first lower plate 71 and the first support base 27L in the axial direction D AXThe first upper plate member 72 and the first lower plate member 71 are provided between the first lower plate member 76 and the second support base 27R. AX The distance L5 between the first support stand 27L and the AX The width W1 between the first upper plate member 72 and the first support base 27L is narrower than the width W1 of the first upper plate member 72 and the first support base 27L in the axial direction D AX The distance L3 is the axial direction D of the first support stand 27L. AX In other words, the width W1 in the axial direction D between the first dust intrusion prevention mechanism 70 and the first support base 27L is narrower than the width W2. AX The distance L3 is the axial direction D of the first support stand 27L. AX The axial direction D between the first upper plate member 77 and the first lower plate member 76 is shorter than the width W1 of the first upper plate member 77 and the first lower plate member 76. AX The distance L6 between the second support base 27R and the AX The width W2 between the first upper plate member 77 and the second support base 27R is narrower than the width W3 of the first upper plate member 77 and the second support base 27R in the axial direction D AX The distance L4 is the axial direction D of the second support base 27R. AX In other words, the axial width D between the second dust intrusion prevention mechanism 75 and the second support base 27R is narrower than the width W2. AX The distance L4 is the axial direction D of the second support base 27R. AX It should be noted that the distance L4 is substantially equal to the distance L3, and the distance L6 is substantially equal to the distance L5.
[0040] The first lower plate member 76 (71) is provided on the upper support frame 24 and is spaced apart from the upper support frame 24 in the height direction D H The first lower plate member 76 (71) extends upward in the front-rear direction D FB The first lower plate member 76 (71) is connected to the extension frame 26 at its rear end. H In the axial direction D AX 12 and 14, the second support base 27R (first support base 27L) overlaps with a large portion of the first lower plate member 76 (71). H 14, the first upper plate member 77 (72) is provided on the cover CV and is spaced apart from the cover CV in the height direction D. HThe first upper plate member 77 (72) extends downward in the height direction D H The lower the distance, the greater the height direction D H And axial direction D AX D perpendicular to the front-back direction FB Therefore, the first upper plate member 77 (72) is prevented from contacting the extension frame 26 when the cabin 5 is rotated.
[0041] Referring to FIG. 14, the first upper plate member 77 (72) is in the axial direction D AX When viewed from the outside, the first dust intrusion prevention mechanism 70 covers the gap G2 between the cab frame 53, the first lower plate member 76 (71), the first support base 27L, and the cover CV. AX When viewed from the outside, the second dust intrusion prevention mechanism 75 overlaps with the gap G2 between the cab frame 53, the upper support frame 24, the first support base 27L, and the cover CV. AX When viewed from the outside, it overlaps with the gap G2 between the cab frame 53, the upper support frame 24, the second support base 27R and the cover CV. <Actions and Effects of the Second Embodiment>
[0042] In the work vehicle 1 according to the second embodiment, the first dust intrusion prevention mechanism 70 (the second dust intrusion prevention mechanism 75) is also AX , it overlaps with the gap G2 between the cab frame 53, the upper support frame 24, the first support base 27L (second support base 27R), and the cover CV. This makes it possible to prevent dust from entering the work vehicle 1 through the gap between the upper support frame 24 and the cabin 5 in the portion covered with the cover CV.
[0043] The first upper plate member 77 (72) is AX The first lower plate 76 (71) is disposed between the first lower plate 71 and the second support stand 27R (first support stand 27L) in the height direction D from the cover CV. H The first upper plate member 77 (72) is spaced apart from the upper support frame 24 in the height direction D H The first upper plate member 72 and the first lower plate member 71 are spaced apart from each other in the axial direction D AXThe distance L5 between the first support stand 27L and the AX The width W1 between the first upper plate member 72 and the first support base 27L is narrower than the width W1 of the first upper plate member 72 and the first support base 27L in the axial direction D AX The distance L3 is the axial direction D of the first support stand 27L. AX The width W1 of the first upper plate member 77 and the first lower plate member 76 in the axial direction D AX The distance L6 between the second support base 27R and the AX The width W2 between the first upper plate member 77 and the second support base 27R is narrower than the width W3 of the first upper plate member 77 and the second support base 27R in the axial direction D AX The distance L4 is the axial direction D of the second support base 27R. AX The width W2 of the upper support frame 24 is narrower than the width W2 of the upper support frame 24. Therefore, the first dust intrusion prevention mechanism 70 and the first support base 27L form a labyrinth structure with a narrow air passage, and the second dust intrusion prevention mechanism 75 and the second support base 27R form a labyrinth structure with a narrow air passage. This makes it possible to further prevent dust from invading through the gap between the upper support frame 24 and the cabin 5 in the portion covered with the cover CV.
[0044] The first dust intrusion prevention mechanism 60 and the second dust intrusion prevention mechanism 65 are both arranged in the front-rear direction D FB The first lower plate member 76 (71) is connected to the extension frame 26 at its rear end, and in the closed state, AX In view of the above, the cover CV includes the cab frame 53, the first lower plate member 76 (71), and the first upper plate member 77 (72) that covers the gap G2 between the first support base 27L and the cover CV. As a result, in the closed state, most of the gap surrounded by the cab frame 53, the upper support frame 24, the extension frame 26, and the cover CV can be blocked, thereby further preventing dust from entering through the gap between the cabin 5 and the upper support frame 24 in the portion covered by the cover CV. <Modification>
[0045] In the above-described embodiment, the first dust intrusion prevention mechanism 60 (70) and the second dust intrusion prevention mechanism 65 (75) are arranged in the axial direction D of the first support base 27L and the second support base 27R, respectively. AX The inner side of the shaft is AXIn that case, it is preferable to provide a cover such as a cover CV on the top of the first dust intrusion prevention mechanism 60 (70) and the second dust intrusion prevention mechanism 65 (75).
[0046] 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.
[0047] The terms "member," "part," "element," "body," and "structure" may have multiple meanings, such as a single part or multiple parts.
[0048] 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."
[0049] 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."
[0050] 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.
[0051] 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 vehicle body frame having a vehicle front portion and a vehicle rear portion opposite the vehicle front portion; A cab frame connected to the vehicle body frame so as to be rotatable about a cab rotation axis; a cover for covering a gap between the vehicle body frame and the cab frame; A first dust intrusion prevention mechanism having a labyrinth structure provided between the vehicle body frame and the cab frame; Equipped with The rear of the vehicle body is A first support base is provided at a position away from a center of the vehicle body, which is a center of the vehicle body frame in an axial direction along the cab rotation axis, and rotatably supports the cab frame; an upper support frame having a first end and a second end opposite to the first end in the axial direction, the upper support frame supporting the first support platform between the first end and the second end in the axial direction; an engine room provided below the upper support frame in a height direction along the height of the vehicle body frame; having The first support base is provided between the vehicle body center and the first end in the axial direction, In a closed state in which the cab frame is placed on the front portion of the vehicle body, a front end of the upper support frame and a rear end of the cab frame are spaced apart from each other in the height direction, The cover extends from the cab frame toward the rear of the vehicle body and is configured to cover the upper support frame between the center of the vehicle body in the axial direction and the first support base at an upper portion in the height direction, The first dust intrusion prevention mechanism is provided between the center of the vehicle body and the first end in the axial direction and between the upper support frame and the cover in the height direction, and overlaps with a gap between the rear end of the cab frame, the front end of the upper support frame, the first support base, and the cover as viewed in the axial direction. Work vehicle.
2. The rear of the vehicle body is A second support base is supported by the upper support frame between the first support base and the second end in the axial direction and rotatably supports the cab frame. the cover covers the upper support frame between the center of the vehicle body in the axial direction and the second support base at an upper portion in the height direction, a second dust intrusion prevention mechanism provided between the vehicle body center and the second end in the axial direction and between the upper support frame and the cover in the height direction; The second dust intrusion prevention mechanism overlaps with gaps between the cab frame, the upper support frame, the second support base, and the cover when viewed in the axial direction. A work vehicle according to claim 1.
3. The first support base and the second support base are supported by the upper support frame at positions symmetrical to each other with respect to the center of the vehicle body. The work vehicle according to claim 2.
4. an engine provided in the engine room; an exhaust treatment device provided in the engine room and configured to treat exhaust gas from the engine; Further equipped with The exhaust treatment device is located between the first dust intrusion prevention mechanism and the second dust intrusion prevention mechanism in the axial direction. A work vehicle according to any one of claims 1 to 3.
5. The first dust intrusion prevention mechanism includes: a first lower plate member provided on the upper support frame, extending upward from the upper support frame in the height direction, and spaced apart from the cover in the height direction; a first upper plate member provided on the cover, extending downward from the cover in the height direction and spaced apart from the upper support frame in the height direction; having A work vehicle according to any one of claims 1 to 4.
6. The first upper plate member covers gaps between the cab frame, the first lower plate member, the first support base, and the cover when viewed in the axial direction in the closed state. A work vehicle according to claim 5.
7. The first upper plate member has a shape that becomes narrower in the front-rear direction perpendicular to the height direction and the axial direction as it goes downward in the height direction in the closed state. A work vehicle according to claim 6.
8. The work vehicle according to claim 6 or 7, wherein the first upper plate member is provided between the first lower plate member and the first support base in the axial direction.
9. The first lower plate member overlaps with a gap between the cab frame, the first upper plate member, the first support base, and the upper support frame when viewed in the axial direction in the closed state. A work vehicle according to any one of claims 6 to 8.
10. The vehicle body frame further includes an extension frame extending upward in the height direction from the upper support frame and connected to the cover, The first lower plate member is connected to the extension frame at a rear end in a front-rear direction perpendicular to the height direction and the axial direction. A work vehicle according to any one of claims 5 to 9.
11. The first dust intrusion prevention mechanism includes: a second lower plate member provided on the upper support frame, extending upward from the upper support frame in the height direction, and spaced apart from the cover in the height direction; a third lower plate including a bottom portion connected to the second lower plate and an upper portion bent from the bottom portion to be separated from the second lower plate and extending upward, the third lower plate being separated from the cover in the height direction; an elastic member sandwiched between the second lower plate member and the third lower plate member; having The elastic member abuts against the cover in the closed state. A work vehicle according to any one of claims 1 to 4.
12. The first dust intrusion prevention mechanism includes: The second lower plate further includes an additional elastic member provided at a front end in a front-rear direction perpendicular to the height direction and the axial direction, The additional elastic member abuts against the cab frame in the closed state. A work vehicle according to claim 11.
13. The vehicle body frame further includes an extension frame extending upward in the height direction from the upper support frame and connected to the cover, The first lower plate member is connected to the extension frame at a rear end in the front-rear direction. A work vehicle according to claim 11 or 12.
14. a vehicle body frame having a vehicle front portion and a vehicle rear portion opposite the vehicle front portion; A cab frame connected to the vehicle body frame so as to be rotatable about a cab rotation axis; a cover for covering a gap between the vehicle body frame and the cab frame; A first dust intrusion prevention mechanism having a labyrinth structure provided between the vehicle body frame and the cab frame; Equipped with The rear of the vehicle body is A first support base and a second support base that rotatably support the cab frame and are arranged side by side in the axial direction; an upper support frame supporting the first support base and the second support base; an engine room provided below the upper support frame in a height direction along the height of the vehicle body frame; having In a closed state in which the cab frame is placed on the front portion of the vehicle body, a front end of the upper support frame and a rear end of the cab frame are spaced apart from each other in the height direction, The cover extends from the cab frame toward the rear of the vehicle body and is configured to cover the upper support frame between the first support base and the second support base in the axial direction at an upper portion in the height direction, The first dust intrusion prevention mechanism is provided between the first support base and the second support base in the axial direction and between the upper support frame and the cover in the height direction, and overlaps with a gap between the rear end of the cab frame, the front end of the upper support frame, the first support base, and the cover as viewed in the axial direction. Work vehicle.
15. A second dust intrusion prevention mechanism is provided between the first dust intrusion prevention mechanism and the second support base in the axial direction and between the upper support frame and the cover in the height direction, The second dust intrusion prevention mechanism overlaps with gaps between the cab frame, the upper support frame, the second support base, and the cover when viewed in the axial direction. A work vehicle as claimed in claim 14.
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