JP4727855B2 - Mobile farm machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile agricultural machine such as a combine for continuously harvesting and threshing grains in a field.
[0002]
[Problems to be solved by the invention]
Conventionally, as shown in JP-A-1-28079, left and right traveling crawlers supported by driving sprockets and idle rollers are mounted on left and right track frames via track rollers, and the left and right tracks are connected to this machine via crawler lifting arms. There is a technique in which a frame is provided so that it can be controlled to move up and down, and the left and right inclination of the machine is corrected and supported for up and down movement. However, since the conventional technology lowers the track frame in the direction approaching the drive sprocket when raising the machine, it can reduce the change in the circumference of the traveling crawler and prevent the tension from changing. The center of gravity of the aircraft moves to the rear side of the traveling crawler's front and back contact width, the aircraft tilts backward, the cutting part at the front of the aircraft rises, and the cutting height changes. The ground contact pressure on the rear side of the crawler is increased, and the rear side of the crawler is likely to enter the soil by traveling backward, resulting in a problem that the direction change performance in a soft field headland such as a wet field is lowered.
[0003]
[Means for Solving the Problems]
However, according to the present invention, the left and right traveling crawlers supported by the drive sprocket and the tension roller are mounted on the left and right track frames via the track rollers, and the left and right track frames can be controlled to move up and down via the crawler lifting arms. In the mobile agricultural machine to be installed, the tension roller is attached to the tension frame so that the tension can be adjusted, the tension frame is attached to the track frame via a link mechanism, and the truck frame is moved forward and downward relative to the machine base of the machine. When the ground clearance is increased , the mobile farm machine is characterized in that the tension roller is moved rearward and downward of the track frame to increase the ground contact width of the traveling crawler .
[0004]
The link mechanism includes a front idler link for connecting a fulcrum shaft provided on the track frame and a pivot shaft provided on the tension frame, a link shaft provided at a position rearward of the fulcrum shaft, and the pivot shaft. A rear idler link connecting a pivot shaft provided at a rear position, and when the track frame is closest to the machine base, the rear idler link is erected vertically and the front idler link The idler link should protrude horizontally in front of the fulcrum shaft.
[0005]
Further, the rear idler link has a longer link length than the front idler link.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall side view of the combine, FIG. 2 is a plan view thereof, FIG. 3 is a side view of the track frame portion, and 1 and 2 in the figure are left and right track frames on which the left and right traveling crawlers 3 and 4 are installed. A machine base erected on the track frames 1 and 2, a threshing unit 6 with a feed chain 7 stretched to the left and a handling cylinder 8 and a processing cylinder 9 built in, 10 a cutting blade 11 and a culm conveying mechanism 12 , A hydraulic cutting / lifting cylinder 13 for moving the cutting unit 10 up and down around the cutting fulcrum shaft 15 via the cutting frame 14, 16 a staking cutter that faces the terminal end of the staking chain 17, and 18 from the threshing unit 6. A grain tank for carrying in the grain through the milling cylinder 19, a discharge auger for carrying out the grain in the tank 18 to the outside of the machine, 21 a driving operation unit 22 such as a steering handle and a driving seat 23. Cabin, 24 is luck Cabin 21 an engine provided below, are configured to threshing continuously harvests culms.
[0015]
As shown in FIGS. 4 to 11, a pair of left and right machine frames 25 and 26 are fixed to the lower surface of the machine base 5 by front and rear horizontal frames 27, and bearings are provided at both ends of the left and right machine frames 25 and 26 extending in the front and rear direction. The body 28 is fixed, the front and rear fulcrum shafts 29 and 30 are rotatably supported on the bearing body 28, and the left and right paired front and rear swing arms 31 and 32 having substantially the same shape are formed in the L shape in side view. The rear end side of the lower swing arm 32 is rotatably connected to a support shaft 33 that is fixed to both ends and rotatably supported on the track frames 1 and 2, and extends in the front-rear direction. The upper end of the upper swing arm 31 is connected, a hydraulic elevating cylinder 35 is provided in the middle of the connecting member 34, and the connecting member 34 is pushed and pulled back and forth by the hydraulic pressure of the elevating cylinder 35, so Nguamu attached vertically movably to each other 31, 32 right and left track frames 1 and 2 through the relative machine frame 5. A lifting cylinder 35 is attached to the machine base 5 via a bracket 36.
[0016]
Further, a drive sprocket 39 attached to the transmission case 37 on the front side of the machine base 5 via an axle case 38, a plurality of track rollers 40, a movable roller 41, and a tension roller 42 attached to the outside surface of the truck frames 1 and 2; And a carrier roller 43 to be mounted on the machine frames 25 and 26, and the track frames 1 and 2 are provided with the traveling crawlers 3 and 4 on the ground side, and the tension frame 44 to be attached to the rear part of the track frames 1 and 2 is used for tension adjustment. A tension roller 42 is provided via a bolt 45 and an idler frame 46, and the tension of the traveling crawlers 3 and 4 is set by semi-fixed tension adjustment in which the idler frame 46 is moved in and out by operating the tension bolt 45 behind the tension frame 44. Elevating The front and rear swing arms 31 and 32 are swung around the fulcrum shafts 29 and 30 by the slider 35, and the rollers 40, 41 and 42 and the track frames 1 and 2 are moved up and down, and the grounding side of the traveling crawlers 3 and 4 is moved up and down. Thus, the left and right lifting cylinders 35 and 35 are individually operated by the manual operation of the lifting adjustment switch provided in the driving operation unit 22 and the automatic control based on the detection result of the tilt sensor that detects the left and right tilting of the machine base 5. The ground contact height of the traveling crawlers 3 and 4 is changed to correct the left / right inclination of the machine base 5 so as to be supported substantially horizontally.
[0017]
As shown in FIGS. 12 to 20, the left and right sides of the tension frame 44 are connected to the rear portions of the track frames 1 and 2 via front and rear idler links 47 and 48 so as to be movable in the front and rear directions. A pair of left and right seat plates 49 are fixed to both sides of the rear portion of the track frames 1 and 2, and a fulcrum shaft 33 and a link shaft 50 that pass between the left and right seat plates 49 are connected to the front and rear idlers. The pivot shafts 51 and 52 on both sides of the tension frame 44 are connected via the links 47 and 48.
[0018]
Further, two pairs of bolt mounting seats 53 are fixed at a 180 degree symmetrical position outside the front end of the tension frame 44, and the tension bolt receiver 55 is detachably fixed to the mounting seat 53 via two fastening bolts 54. The tension bolt 45 is arranged in the approximate center between the nut receiving plate 56 and the bolt receiver 55 fixed inside the front portion of the idler frame 46. The hexagonal head 45a of the tension bolt 45 is inserted into the through hole of the bolt receiver 55. The stepped portion 45 b is brought into contact with the inner surface of the bolt receiver 57, the nut 58 coupled to the tension bolt 45 is brought into contact with the outer surface of the nut receiving plate 56, and the outer shape is aligned with the inner surface of the tension frame 44. A square rotation-preventing member 59 is fixed to the nut 58, and the tension bolt 45 is rotated from the outside of the bolt receiver 55. From emissions Deployment frame 44 by stretching the idler frame 46 is configured to perform the tension adjustable tensioning of the travel crawler 3.4 by the tension roller 42.
[0019]
Then, as shown in FIG. 9 (1), the truck frames 1 and 2 are brought closest to the machine base 5 and the lift control operation by the lift cylinder 35 is stopped, or a hard traveling road surface such as a dry rice field and an agricultural road is moved. In this state, the rear idler link 48 is erected substantially vertically, and the front idler link 47 is projected substantially horizontally in front of the support shaft 33 so that the lower swing arm 32, the support shaft 33, and the tension frame 44 are connected. The connecting shaft 51 is supported at substantially the same height as the support shaft 33, and the traveling crawlers 3, 4 are grounded between the track rollers 40 at the front and rear ends of the track frames 1, 2. At this time, the ratio (L / B) between the ground contact length L and the gauge width B of the left and right traveling crawlers 3 and 4 is set to 1.5 or less so as to minimize the turning radius, and the ratio (L / B ) Increases to, for example, 1, 7 or more, the turning radius is also increased, and the problem that the turning resistance moment increases is eliminated.
[0020]
Further, as shown in (2) and (3) of FIG. 9, the elevating cylinder 35 is driven to slide the connecting member 34 rearward, and the upper swing arm 31 is rotated rearward around the fulcrum shafts 29 and 30. The lower swing arm 32 is rotated downward around the fulcrum shafts 29 and 30 to move the track frames 1 and 2 forward and the traveling crawlers 3 and 4 that are supported by the track roller 40 and the movable roller 41 forward and downward. The ground level of the machine base 5 is increased, and the shaft 51 of the front idler link 47 is raised around the support shaft 33 by the downward rotation of the rear lower swing arm 32, and the front side of the tension frame 44 is moved to the track frames 1 and 2. The rear idler link 48 is tilted rearward and the rear side of the tension frame 44 is lowered in the direction of the rear descending slopes 1a and 2a of the track frames 1 and 2. Then, the tension roller 42 at the rear of the tension frame 44 is lowered and moved rearward and downward with respect to the track frames 1 and 2, so that the circumferential length of the traveling crawlers 3 and 4 is kept substantially constant as compared with the prior art as shown in FIG. The back and forth movement of the tension roller 42 increases the ground contact width of the traveling crawlers 3 and 4 to the rear of the track rollers 1 and 2 so that the traveling crawlers 3 and 4 are supported between the front and rear track rollers 40. The ground contact length L2 of the traveling crawlers 3 and 4 supported between the last track roller 40 and the tension roller 42 is added to the length L1, and the ground contact length (L1 + L2) of the traveling crawlers 3 and 4 is increased backward. At this time, the ratio of the ground contact length (L = L1 + L2) of the left and right traveling crawlers 3 and 4 to the gauge width B (L / B) is maintained at about 1.7 or less, and the ratio increases to increase the turning radius and the turning resistance. By preventing the moment from increasing and extending the ground contact length of the traveling crawlers 3 and 4 backward, the center of gravity movement of the traveling crawlers 3 and 4 in the front-rear direction is reduced, and the rear of the traveling crawlers 3 and 4 is reduced. In addition, the ground contact pressure per unit area is reduced by expanding the ground contact surface of the traveling crawlers 3 and 4, and the ground subsidence of the traveling crawlers 3 and 4 is reduced.
[0021]
As is apparent from the above, idler links 47 and 48, which are link mechanisms, are swingably provided on the track frames 1 and 2, and a tension frame 44 is provided on the idler links 47 and 48 to attach the tension roller 42 so that the tension can be adjusted. The traveling crawlers 3 and 4 are moved by moving the tension roller 42 in the direction in which the track rollers 1 and 2 are moved away from each other in the extending direction and moving downward, and the tension rollers 42 are moved rearward and downward without changing the circumferential length of the traveling crawlers 3 and 4. The front / rear ground contact length on the rear side is enlarged or reduced to simplify the tension structure of the traveling crawlers 3 and 4 and improve the traveling performance, and the tension frame 44 on which the tension roller 42 is mounted so that the tension can be adjusted is attached to the swing arm 31. -Move in conjunction with 32 lift control operations to move up and down The tension roller 42 is moved in the direction opposite to the longitudinal movement of the track frames 1 and 2 by the control operation to expand and contract the contact length on the rear side of the traveling crawlers 3 and 4, thereby reducing the rearward movement of the center of gravity of the aircraft accompanying the lifting control operation Thus, the change in the ground pressure on the rear side of the traveling crawlers 3 and 4 is reduced, and the conventional crawlers 3 and 4 rear part caused by the elevation control operation is eliminated, and the amount of settlement of the traveling crawlers 3 and 4 is reduced. To improve driving performance such as swamping work in swampy fields or field headlands.
[0022]
Further, the front side of the traveling crawlers 3 and 4 is supported by the drive sprocket 39, the rear side of the traveling crawlers 3 and 4 is supported by the tension roller 42, and the truck roller 40 and the track frames 1 and 2 are lifted by the swing arms 31 and 32. The operation of moving the tension roller 42 in the traveling crawler 3, 4 grounding direction is linked to the operation of moving the tension roller 42 in the direction of grounding. It is extended to prevent improper settlement on the rear side of the traveling crawlers 3 and 4, and the conventional center of gravity movement causes a difference in the amount of settlement between the front and rear portions of the traveling crawlers 3 and 4, so that the rearward tilt state is inclined. To prevent wetlands and improve wetland driving performance.
[0023]
As shown in FIGS. 12 and 18, an opening 60 having a predetermined length is formed on the upper surface of the track frames 1 and 2 below the tension frame 44, and between the track frames 1 and 2 and the tension frame 44 by lifting control. Even if a gap is generated and mud or a stand is sandwiched, the mud or stone is dropped below the opening 60 to prevent inconvenience such as poor lifting control.
[0024]
Further, a cylinder receiving plate 63 is fixed to the rear end of the expansion / contraction adjusting rod 62 with the turnbuckle 61 to constitute the connecting member 34. The rod 62 and the cylinder receiving plate 63 are connected to shafts 64 and 65 at the upper end of the front and rear swing arm 31. The lifting / lowering cylinder 35 is attached to the bracket 36 fixed to the rear surface of the machine frame 66 of the machine base 5 via the shaft 67, and the tip of the piston 68 of the lifting / lowering cylinder 35 is connected to the cylinder receiving plate 63 via the shaft 69. The shafts 65, 67, and 69 are provided on the extension line of the axis of the piston 68 of the lifting cylinder 35 to prevent the extension force of the piston 68 from acting as a compression force on the cylinder receiving plate 63 and deforming the cylinder. The receiving plate 63 is configured to be reduced in size and weight.
[0025]
As shown in FIGS. 13 to 15, the lower swing arm 32 connected to the rear swing arm 31 via the swing shaft 70 is also used as the front idler link 47, and the middle of the arm 32 is connected to the pivot shaft 51. In addition to reducing the number of points, the track frames 1 and 2 and the tension frame 44 are connected to each other by the swing arm 32, the front idler link 47, and the left and right rear idler links 48 so as to be supported in a compact manner and have high strength. Is configured to do.
[0026]
Further, the spline shaft portion 71 at the inner end of the swing shaft 70 is coupled to the end boss portion 31a of the rear swing arm 31 connected to the cylinder receiving plate 63 via the shaft 65, and the spline shaft portion at the outer end of the swing shaft 70 is connected. 72, the base end boss portion 32a of the lower swing arm 32 is coupled and connected, and the front end boss portion 32b of the lower swing arm 32 and the front idler are connected to the inner end spline shaft portion 73 of the support shaft 33 and the shaft portion 75 with the outer end key 74. Relative positional relationship between the rear inner and outer swing arms 31 and 32, the lower swing arm 32, the support shaft 33, the support shaft 33, and the front idler link 47 by connecting and connecting the base end boss portions 47a of the links 47 respectively. Therefore, the idler link 47 having an appropriate positional relationship can be attached to the elevating cylinder 35 to improve the assemblability.
[0027]
Further, as shown in FIGS. 10 and 13, the idler links 47 and 48 are formed such that the link length of the rear idler link 48 is larger than that of the front idler link 47, and the front idler link 47 is omitted when the lifting cylinder 35 is contracted to the minimum. Horizontal (a line), rear idler link 48 is positioned substantially vertical (b line). When elevating cylinder 35 is extended, front idler link 47 is moved up around support shaft 33, and rear idler link 48 is moved to link shaft 50. From the substantially horizontal posture position of the tension frame 44, with the amount of upward movement of the front idler link 47 immediately after starting the extension of the elevating cylinder 35 being increased and the amount of rearward swing of the rear idler link 48 being increased. A tension that increases the initial movement amount and moves the rear tension roller 42 downward only to suppress the change in the circumferential length of the traveling crawlers 3 and 4 to a minimum. It is configured to perform rear lower movement of Nrora 42.
[0028]
Reference numeral 76 denotes a cutting fulcrum base that is fixed to the upper part of the machine base 5 and supports the lifting fulcrum shaft of the cutting part 10, and 77 is a base end fixed to the upper surface of the machine frame 25 and 26 to the outer horizontal protruding end. A roller shaft that supports the carrier roller 43.
[0029]
Further, as shown in FIGS. 6 and 7, inner frame portions 25a and 26a that are allowed to face the traveling crawlers 3 and 4 are attached to the lower machine frames 25 and 26 that are connected to the track frames 1 and 2 via the lower swing arm 32, respectively. The bearing body 28 that supports the front and rear fulcrum shafts 29 and 30 is provided with the inner frame portions 25a and 26a, and the lower swing arm 32 is also disposed in the traveling crawlers 3 and 4. 32 is arranged on the inside of the crawlers 3 and 4 without making a business trip to the outside of the traveling crawlers 3 and 4 so as to improve the mud repellency, and the swing of the swing arm 32 is made smooth. The frame 25, 26 outside the frame 4 extends rearward regardless of the crawlers 3, 4, and the horizontal frame 27 connecting the frames 25, 26 is connected. To enhance such location flexibility, and configured to enhance the rigidity of the entire frame 25, 26.
[0030]
As is apparent from the above, the left and right track frames 1 and 2 are supported to be lifted and lowered by swinging arms 31 and 32, which are lifting arms, and the tension roller 42 that stretches the traveling crawlers 3 and 4 is attached to an idler. In the combine supported by the track frames 1 and 2 via the links 47 and 48 so that the tension can be adjusted, the idler frame 46 having the tension roller 42 is connected to the tension frame 44 in a telescopic manner, and the tension frame 45 and the tension bolt 45 and By indirectly connecting the idler frame 46 via the nut 58, for example, in a wet running surface such as a wet paddy where the running crawlers 3 and 4 have a large amount of subsidence, a lifting control operation is performed to lower the track frames 1 and 2. But by the movement of the idle roller 42 The front and back ground contact length of the row crawlers 3 and 4 can be increased, the front and rear balance of the traveling crawlers 3 and 4 with respect to the ground contact surface of the traveling crawlers 3 and 4 can be reduced, and the front and rear balance can be easily maintained. The contact pressure can be reduced to reduce the contact pressure of the traveling crawlers 3 and 4 so that the traveling performance can be easily improved by changing the direction. For example, the traveling crawler 3 on a hard traveling surface such as a dry field or an agricultural road.・ Shortening the front and back contact length of 4 to ensure the specified turning performance, and even if the expansion screw part of the idler frame 46 is damaged, the performance can be maintained stably by replacing only the tension bolt 45. It can be easily achieved.
[0031]
Further, the nut 58 is brought into contact with the substantially central portion of the idler frame 46 so as to be pressed against the idler frame 46, thereby enabling smooth expansion and contraction that prevents the idler frame 46 and the tension frame 44 from being twisted. Can be made.
[0032]
Further, the bolt receiver 55 member that supports the tension bolt 45 is connected to the tension frame 44 via the fastening bolt 54, and the fastening bolts 54 are arranged at equal pitches around the tension bolt 45 at the same pitch. It is possible to improve the stability of the support by the tension bolt 45 or the like by making the force applied to the bolt 54 substantially equal.
[0033]
In addition, by connecting the swing arms 31 and 32 and the idler links 47 and 48 while maintaining the attachment positional relationship, the track frames 1 and 2 and the tension roller 42 are appropriately connected to the elevating cylinder 35 to improve the assemblability. In addition, the raising / lowering control of the track frames 1 and 2 can be made favorable.
[0034]
Further, the tension frame 44 for attaching the tension roller 42 and the track frames 1 and 2 are formed separately, and the relative positions of the track frames 1 and 2 and the tension frame 44 can be changed when the left and right track frames 1 and 2 are controlled to be raised and lowered. As a result, the change in the crawler circumferential length during the elevation control is absorbed by the movement of the track frames 1 and 2 and the tension roller 42, and the running crawlers 3 and 4 are always properly supported, and the durability of the crawlers 3 and 4 is maintained. Can be improved.
[0035]
Further, the tension frame 44 and the track frames 1 and 2 are connected to the left and right sides of the track frames 1 and 2 via idler links 47 and 48, and the idler links 47 and 48 are provided in a double-supported structure. Thus, it is possible to make the connection with good strength and to improve the stability in the elevation control.
[0036]
Further, the swing arm 32 and the tension frame 44 are connected via an idler link 47, and the idler link 47 is disposed substantially in parallel with the tension direction of the tension roller 42, whereby the tension frame 44 and the idler link 47 are arranged. It is possible to suppress the twisting due to the tension action from being applied to the support shaft 33 which is the connecting shaft to be connected, and it is possible to improve durability and to smoothly rotate the tension frame 44 around the support shaft 33.
[0037]
Further, the swing arms 31 and 32 and the idler links 47 and 48 are provided so as to suppress the change in the circumferential length of the traveling crawlers 3 and 4 to the minimum, so that the drive sprocket 39, the track roller 40, and the tension roller regardless of the elevation control. Thus, it is possible to satisfactorily support the traveling crawlers 3 and 4 by 42 and the like, and the traveling performance can be stably maintained.
[0038]
Further, by providing an opening 60 for dropping mud on the upper surface of the track frames 1 and 2 below the tension frame 44, mud, stones, etc. are caught in the gap between the track frames 1 and 2 and the tension frame 44. Even if rare, such mud or stone can be quickly dropped downward to prevent inconveniences such as poor elevating control, and the elevating control accuracy for correcting the horizontal inclination of the machine can be improved.
[0039]
Further, inner frame portions 25a and 26a are provided on the lower machine frames 25 and 26 connected to the track frames 1 and 2 so as to face the traveling crawlers 3 and 4, and a bearing body which is a fulcrum shaft portion of the lower swing arm 32 is provided. 28 is provided on the inner frame portions 25a and 26a, so that the lower swing arm 32 can be arranged compactly inside the crawlers 3 and 4 without making a business trip outside the traveling crawlers 3 and 4, thereby improving mud repellency. Can be improved.
[0040]
By the way, as shown in FIGS. 22 and 23, the movable roller 41 has a base end boss 79a of a roller arm 79 mounted in a swingable manner through a shaft 80 in a track frame 1 and 2 having a gate-shaped section. A torsion spring 81 for biasing the roller 41 toward the inner surfaces of the crawlers 3 and 4 is interposed between the frames 1 and 2 and the boss portion 79a to support the movable roller 41 in a compact structure, and the roller arms 79 are supported by the frames 1 and 2. It is configured to prevent inconvenience such as adhesion of mud on the top, to improve the cleaning performance and to stably maintain the function of the movable roller 41.
[0041]
【The invention's effect】
As is apparent from the above embodiments, the present invention is such that the left and right traveling crawlers supported by the drive sprocket and the tension roller are mounted on the left and right track frames via the track rollers, and the left and right track frames are installed on the machine via the crawler lifting arms. In a mobile agricultural machine that can move up and down freely, a tension roller is attached to the tension frame so that the tension can be adjusted, and the tension frame is attached to the track frame via a link mechanism. When the ground height of the machine base is increased by moving the tension roller to the rear lower part of the track frame, the ground contact width of the traveling crawler is expanded. When the driving surface is increasing, Even when the lifting control operation is performed, the front and back contact length of the traveling crawler can be expanded by the movement of the tension roller, the front and rear balance of the traveling crawler with respect to the ground contact surface of the traveling crawler can be reduced, and the front and rear balance can be easily maintained. In addition, the ground contact surface of the traveling crawler becomes large and the contact pressure can be reduced, and the traveling performance of the traveling crawler can be reduced by reducing the settlement of the traveling crawler. A predetermined turning performance can be ensured by shortening the front and back contact length of the traveling crawler.
[0042]
The link mechanism includes a front idler link for connecting a fulcrum shaft provided on the track frame and a pivot shaft provided on the tension frame, a link shaft provided at a position rearward of the fulcrum shaft, and the pivot shaft. A rear idler link connecting a pivot shaft provided at a rear position, and when the track frame is closest to the machine base, the rear idler link is erected vertically and the front idler link The idler link protrudes horizontally in front of the fulcrum shaft , and allows the tension roller to perform a desired operation with a simple link mechanism .
[0043]
The rear idler link has a longer link length than the front idler link . When the truck frame is moved forward and downward relative to the base of the unit, the ground level of the base is increased. The initial amount of movement to change the posture of the tension frame from the substantially horizontal posture position to the front high and low posture position can be increased, and the tension roller is moved backward while suppressing the change in the circumferential length of the traveling crawler to a minimum. It is something that can be done.
[Brief description of the drawings]
FIG. 1 is an overall side view.
FIG. 2 is a plan view of the same.
FIG. 3 is a side view of a traveling crawler unit.
FIG. 4 is a plan view of a machine base.
FIG. 5 is a plan view of the machine frame unit.
FIG. 6 is a plan view of a traveling crawler unit.
FIG. 7 is an explanatory plan view of the machine frame unit.
FIG. 8 is a perspective explanatory view of the machine frame.
FIG. 9 is an explanatory diagram for raising and lowering the machine frame.
FIG. 10 is an explanatory side view of a horizontal cylinder portion.
FIG. 11 is an explanatory side view of the machine base.
FIG. 12 is an explanatory perspective view of a tension roller portion.
FIG. 13 is an explanatory side view of a tension roller portion.
FIG. 14 is an explanatory diagram of an opening.
FIG. 15 is a plan view of a tension roller unit.
FIG. 16 is an explanatory plan view of a tension roller portion.
FIG. 17 is an explanatory plan view of a horizontal cylinder.
FIG. 18 is an explanatory diagram of a tension bolt part.
FIG. 19 is a cross-sectional explanatory view of a tension frame portion.
FIG. 20 is a cross-sectional explanatory view of a tension bolt part.
FIG. 21 is an explanatory diagram of a change in the circumference of the crawler.
FIG. 22 is an explanatory side view of the movable roller portion.
FIG. 23 is an explanatory plan view of the movable roller portion.
[Explanation of symbols]
1.2 Track frames 3 and 4 Traveling crawlers 31 and 32 Swing arms (lifting arms)
35 Horizontal cylinder 39 Drive sprocket 42 Tension roller 44 Tension frame 46 Idler frame 47/48 Idler link (link mechanism)

Claims (3)

In the mobile agricultural machine in which the left and right traveling crawlers supported by the drive sprocket and the tension roller are installed on the left and right track frames via the track rollers, and the left and right track frames are provided on the machine via the crawler lifting arms so that the lifting control operation can be freely performed.
Attach the tension roller to the tension frame so that the tension can be adjusted.
The same tension frame is attached to the track frame via a link mechanism,
When the track frame is moved forward and downward relative to the base of this machine to raise the ground level of the base, the tension roller is moved backward and downward of the track frame to increase the ground contact width in the front-rear direction of the traveling crawler. A mobile agricultural machine characterized by that. The link mechanism is
A front idler link for connecting a fulcrum shaft provided on the track frame and a pivot shaft erected on the tension frame;
A rear idler link for connecting a link shaft provided at a rear position from the fulcrum shaft and a pivot shaft provided at a rear position from the pivot shaft;
When the track frame is closest to the machine base, the rear idler link is erected vertically, and the front idler link protrudes horizontally in front of the fulcrum shaft. The mobile agricultural machine according to claim 1. The mobile agricultural machine according to claim 2 , wherein the rear idler link has a longer link length than the front idler link .

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