Work vehicle

Abstract

To improve support strength of tension support members for supporting tension wheels at extension ends in a work vehicle having crawler type right and left running devices.SOLUTION: Drive wheels 28 are disposed at one side position in a front-back direction of out of a front side position on a front side of a front end of a truck frame 30 and a rear side position on a rear side of the truck frame 30, and at a position higher than rolling wheels 33 and in no contact with the ground. Tension wheels 29 are disposed at the other side position in the front-back direction of out of the front side position and the rear side position, and at a position higher than the rolling wheels 33 and in no contact with the ground. Tension support members 47 are disposed in an inclined posture in which a portion which supports the tension wheels 29 in the tension support members 47 is higher than a portion which is supported by the truck frame 30 in the tension support members 47.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a work vehicle equipped with a crawler-type traveling device. [Background technology]

[0002] Patent Document 1 discloses a combine harvester, which is an example of a work vehicle equipped with a crawler-type traveling device, and the traveling device has drive wheels, tension wheels, rollers, a track frame that supports the rollers, and crawler belts. In Patent Document 1, the drive wheels and tension wheels are located in front of the front end and behind the rear end of the track frame, higher than the rollers, and the front and rear of the crawler belt extend diagonally upward from the ground. This allows the traveling device to easily overcome bumps in the ground when moving forward or backward.

[0003] In Patent Document 1, a tension wheel is provided at the rear of the traveling device, and a tension support member that supports the tension wheel at its extended end is attached to the track frame horizontally along the front-rear direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-56626 Summary of the Invention [Problem to be solved by the invention]

[0005] When one focuses on the area around the tension ring in the crawler belt of Patent Document 1, the crawler belt extends diagonally downward from the tension ring toward the ground and also extends horizontally from the tension ring. As a result, when the tension of the crawler belt is applied diagonally downward toward the ground and horizontally relative to the tension ring, the tension of the crawler belt acting diagonally downward from the tension ring applies a downward bending load to the tension support member, so there is room for improvement in terms of improving the support strength of the tension support member.

[0006] The present invention aims to improve the support strength of a tension support member that supports a tension wheel at its extension end in a work vehicle equipped with left and right crawler-type traveling devices. [Means for solving the problem]

[0007] The work vehicle of the present invention has drive wheels, tension wheels, rollers, a track frame supporting the tension wheels and rollers, a tension support member supported by the track frame and supporting the tension wheels on the track frame, and a crawler belt, and is provided with left and right traveling devices supporting a body frame, the drive wheels are disposed at one of a front position forward of the front end of the track frame and a rear position rearward of the rear end of the track frame, and at a position higher than the rollers and not in contact with the ground, the tension wheels are disposed at the other of the front and rear positions, and at a position higher than the rollers and not in contact with the ground, and the tension support member is disposed in an inclined position such that a portion of the tension support member supporting the tension wheel is higher than a portion of the tension support member supported by the track frame. and a left and right first support portion provided at a front portion of the track frame and extending upward from the track frame, a left and right second support portion provided at a rear portion of the track frame and extending upward from the track frame, left and right first links supported by the machine frame to be swingable about a first axis along the left and right direction and swingably connected to the first support portions, and left and right second links supported on the machine frame at a portion rearward of the first links to be swingable about a second axis along the left and right direction and swingably connected to the second support portions, the machine frame being raised and lowered relative to the traveling device by swinging the first links and the second links, and the tension support member being provided at the support portion of the first support portion or the second support portion that is closer to the tension wheel. are.

[0008] According to the present invention, when the tension wheel is installed at the front position higher than the rollers and not in contact with the ground, the tension of the crawler belt is applied diagonally downward and rearward relative to the tension wheel and horizontally rearward. The tension support member is inclined, facing diagonally upward and forward from the track frame. As a result, in addition to the tension of the crawler belt directed diagonally downward and rearward from the tension ring applying a downward bending load to the tension support member, the tension of the crawler belt directed horizontally rearward from the tension ring applies an upward bending load to the tension support member.

[0009] According to the present invention, when the tension wheel is installed at the rear position higher than the rollers and not in contact with the ground, the tension of the crawler belt is applied diagonally downward and forward and horizontally forward relative to the tension wheel. The tension support member is inclined, facing diagonally upward and rearward from the track frame. As a result, in addition to the tension of the crawler belt directed diagonally downward and forward from the tension ring applying a downward bending load to the tension support member, the tension of the crawler belt directed horizontally forward from the tension ring applies an upward bending load to the tension support member.

[0010] According to the present invention, a downward bending load and an upward bending load are applied to the tension support member, and the downward bending load and the upward bending load cancel each other out, so that the downward or upward bending load applied to the tension support member can be reduced and the support strength of the tension support member can be improved. According to the present invention, a first link and a second link are provided which are swingably supported on the machine body, and the first link and the second link are connected to a track frame, and the machine body is raised and lowered relative to the traveling device by swinging the first link and the second link. According to the present invention, a first support portion and a second support portion are provided at the front and rear of the truck frame and extend upward from the truck frame, and a first link and a second link are connected to the first support portion and the second support portion. As a result, the first link and the second link are positioned at a high position relative to the track frame, and the machine body is positioned at a high position relative to the track frame, so the machine body's ground clearance can be reasonably increased, improving driving performance on work areas with large unevenness. According to the present invention, when the first support portion and the second support portion are provided at the front and rear of the truck frame, the tension support member is provided at the support portion of the first support portion or the second support portion that is closer to the tension ring. This allows the tension support member and the first support portion (second support portion) to be configured more compactly than in a configuration in which the tension support member and the first support portion (second support portion) are separately provided on the track frame.

[0011] In the present invention, it is preferable that the drive wheel is provided at the rear position, higher than the roller wheel, and not in contact with the ground, and the tension wheel is provided at the front position, higher than the roller wheel, and not in contact with the ground.

[0012] According to the present invention, when moving forward, tension is generated in the horizontal direction toward the rear at the part of the crawler belt that comes into contact with the ground, so the driving force of the drive wheels is transmitted to the ground efficiently via the crawler belt. This improves the driving performance on work sites for a work vehicle that spends more time moving forward than in reverse.

[0013]

[0014]

[0015]

[0016]

[0017]

[0018] In the present invention, it is preferable that the tension support member is provided in the support part of the first support part or the second support part that is closer to the tension ring, in a portion between the track frame and the part to which the first link is connected or the part to which the second link is connected, when viewed from the side.

[0019] According to the present invention, when the first support portion and the second support portion are provided on the track frame and extend upward from the track frame, the portions of the first support portion and the second support portion to which the first link and the second link are connected are provided above and away from the track frame.

[0020] According to the present invention, the tension support member is provided by effectively utilizing the portion of the first support portion (second support portion) between the portion where the first link (second link) is connected and the track frame, which is advantageous in that the tension support member and the first support portion (second support portion) can be configured compactly.

[0021] In the present invention, it is preferable that the support part of the first support part and the second support part that is closer to the tension ring has a first part connected to the track frame, a second part connected to an upper part of the first part and supporting the tension support member, and a third part connected to an upper part of the second part and to which the first link or the second link is connected.

[0022] According to the present invention, the first support part or the second support part has a first part, a second part, and a third part which have different functions from each other, and the first support part or the second support part is formed by stacking the first part, the second part, and the third part. This allows the tension support member to be supported in the second part between the first part and the third part, making it easy to obtain a configuration in which the tension support member is provided in the first support part or the second support part between the part where the first link (second link) is connected and the track frame.

[0023] In the present invention, it is preferable that the second portion is connected to an upper portion of the first portion and the track frame, and the third portion is connected to an upper portion of the second portion and the track frame.

[0024] According to the present invention, in a first support part or a second support part having a first part, a second part, and a third part, the second part is connected to the upper part of the first part and the track frame, and the third part is connected to the upper part of the second part and the track frame, thereby increasing the connection strength of the first support part or the second support part to the track frame.

[0025] In the present invention, it is preferable that a support portion protruding in the direction opposite to the drive wheel, either forward or rearward, from the second portion is provided on the first portion, and that the support portion supports the tension support member from below.

[0026] According to the present invention, when a tension support member is provided on the first support part, when moving forward, the tension in the crawler belt directed diagonally downward and rearward from the tension ring becomes stronger than the tension in the crawler belt directed horizontally rearward from the tension ring, and it is thought that the downward bending load on the tension support member becomes greater. According to the present invention, when a tension support member is provided on the second support part, when reversing, the tension in the crawler belt directed diagonally downward and forward from the tension ring becomes stronger than the tension in the crawler belt directed horizontally forward from the tension ring, and it is thought that the downward bending load on the tension support member becomes greater.

[0027] According to the present invention, in addition to being supported by the second part of the first support part (second support part), the tension support member is also supported from below by the first part of the first support part (second support part), which is advantageous in terms of improving the support strength of the tension support member in a state in which the downward bending load applied to the tension support member described above increases.

[0028] In the present invention, it is preferable that the second portion is provided with an outlet capable of discharging foreign matter that has entered the second portion, and a lid member capable of opening and closing the outlet.

[0029] In a work vehicle, foreign matter such as soil easily gets into the second part of the first support part (second support part), so when foreign matter such as soil accumulates in the second part of the first support part (second support part), the foreign matter can be discharged from the discharge port. By closing the discharge port with the lid member, foreign matter such as soil is less likely to get into the second part of the first support part (second support part) from the discharge port. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] FIG. 2 is a plan view of the vehicle frame and the traveling device. [Figure 4] FIG. [Figure 5] FIG. 4 is a right side view seen from the VV direction in FIG. 3. [Figure 6] FIG. 10 is a right side view of the vicinity of the tension support member and the first support portion. [Figure 7] FIG. 4 is a vertical right side view of the vicinity of the tension support member and the first support portion. [Figure 8] FIG. 4 is a vertical right side view of the vicinity of the tension support member and the first support portion. [Figure 9] FIG. 2 is a perspective view of the vicinity of a tension support member and a first support portion. [Figure 10] FIG. [Figure 11] FIG. 10 is a right side view of the tension support member. [Figure 12] FIG. 2 is a plan view of a tension support member. [Figure 13] FIG. 4 is a longitudinal sectional rear view of the vicinity of the tension support member and the first support portion. DETAILED DESCRIPTION OF THE INVENTION

[0031] Figures 1 to 13 show a general-purpose combine harvester, which is an example of a work vehicle, where F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

[0032] (Overall configuration of the combine) As shown in Figures 1 and 2, a machine frame 1 is supported by right and left crawler-type traveling devices 2, and a driving unit 4 is provided at the front of the machine frame 1. A threshing device 5 is provided at the left of the machine frame 1, a conveying device 8 is provided at the front of the threshing device 5, and a reaping unit 3 is provided at the front of the conveying device 8. A grain tank 6 is provided at the right of the machine frame 1, and a crop discharge device 7 is connected to the lower rear part of the grain tank 6.

[0033] As the combine moves forward, the crops in the field are cut by the cutting unit 3, and the cut crops are supplied from the conveying device 8 to the threshing device 5 for threshing. The crops threshed by the threshing device 5 are then supplied to the grain tank 6 and stored there. When the grain tank 6 is full, the crops in the grain tank 6 are discharged by the discharge device 7.

[0034] (Aircraft frame configuration) As shown in Figures 3, 4 and 5, the vehicle frame 1 has a plurality of frames 9, 10, frames 11, 12, 13, 14, vehicle side support parts 15, 16, axle support part 19, frames 17, 18, 20 and the like, and is configured in a frame shape.

[0035] The right and left frames 9 are configured by connecting multiple square pipes one above the other and are arranged in the front-to-rear direction. Multiple frames 11, 12, 13, and 14 are arranged in the left-to-right direction and connected across the right and left frames 9. The right and left frames 10 are arranged in the front-to-rear direction, and the right and left ends of the frames 11, 13, and 14 are connected across.

[0036] The right and left aircraft side support parts 15 are connected to the underside of the front part of the frame 9 and extend downward from the frame 9, and a frame 17 extending in the left-right direction is connected across the right and left aircraft side support parts 15.

[0037] The right and left aircraft side support parts 16 are connected to the rear of the frame 9 and extend downward from the frame 9, and a frame 18 extending in the left-right direction is connected across the right and left aircraft side support parts 16. Right and left axle support portions 19 are connected to the rear of the frame 9, and a frame 20 extending in the left-right direction is connected across the right and left axle support portions 19.

[0038] (Engine and transmission case configuration) As shown in FIGS. 3 and 4, the engine 23 is supported on the right part of the frame 11 and is disposed below the driver's section 4.

[0039] A transmission case 24 for traveling is provided, and right and left axle cases 25 are connected to the transmission case 24. The axle cases 25 are connected to the axle supports 19, and the front part of the transmission case 24 is connected to the frame 14 via brackets 26, with the transmission case 24 being supported at the rear of the vehicle frame 1. A fuel tank 27 is supported behind the transmission case 24.

[0040] A transmission belt mechanism (not shown) is provided between the lower part of the threshing device 5 and the lower part of the grain tank 6, and is provided between the engine 23 and the transmission case 24. The power of the engine 23 is transmitted to a transmission (not shown) inside the transmission case 24 via the transmission belt mechanism.

[0041] (Traveling device configuration) As shown in FIGS. 3, 4, and 5, the traveling device 2 has a drive wheel 28, a tension wheel 29, a track frame 30, rollers 33, upper rollers 34, a crawler belt 35, and the like.

[0042] A drive shaft (not shown) is provided inside the axle case 25, and drive wheels 28 are connected to the end of the drive shaft. As described above, the power of the engine 23 is transmitted to the transmission inside the transmission case 24, changed in speed by the transmission, and transmitted to the drive wheels 28 via the drive shaft inside the axle case 25, thereby driving the drive wheels 28 to rotate.

[0043] A plurality of rollers 33 are supported on the track frame 30. As will be described later, a tension wheel 29 is supported on the front of the track frame 30 via a tension support member 47. As will be described later, the track frame 30 is supported on the vehicle frame 1 by a first link 21 and a second link 22.

[0044] The front upper roller 34 is supported by the machine body support part 15, and the rear upper roller 34 is supported by the machine body support part 16. A crawler belt 35 is attached across the drive wheel 28, tension wheel 29, roller 33 and upper roller 34.

[0045] With the above configuration, the left and right running devices 2 have drive wheels 28, tension wheels 29, rollers 33, a track frame 30 that supports the tension wheels 29 and rollers 33, tension support members 47 that are supported by the track frame 30 and support the tension wheels 29 to the track frame 30, and crawler belts 35, and support the machine frame 1.

[0046] The drive wheels 28 are provided at a rear position rearward of the rear end of the track frame 30 (one of the front positions forward of the front end of the track frame 30 and the rear positions rearward of the rear end of the track frame 30 in the fore-and-aft direction), higher than the rollers 33, and not in contact with the ground.

[0047] The tension wheel 29 is provided at a front position forward of the front end of the track frame 30 (the other position in the front-to-rear direction between the front position forward of the front end of the track frame 30 and the rear position rear of the rear end of the track frame 30), higher than the roller 33, and not in contact with the ground.

[0048] (Support structure of track frame to machine frame by first link and second link) 3, 4, and 5, right and left first support portions 31 are connected to the upper surface of the front of the track frame 30 and extend upward from the track frame 30. Right and left second support portions 32 are connected to the upper surface of the rear of the track frame 30 and extend upward from the track frame 30.

[0049] There are provided right and left first links 21. The first link 21 has a fulcrum shaft 21b connected to the base of the first link 21, an arm 21a connected to the end of the fulcrum shaft 21b, and a fulcrum shaft 21c connected to the extending end of the first link 21.

[0050] There are provided right and left second links 22. The second link 22 has a fulcrum shaft 22b connected to the base of the second link 22, an arm 22a connected to the end of the fulcrum shaft 22b, and a swing link 22c supported on the end of the second link 22 so as to be swingable back and forth.

[0051] The fulcrum shafts 21b of the right and left first links 21 are aligned along the axis P1 (first axis) in the left-right direction. The first link 21 extends obliquely downward and forward from the axis P1, and an arm 21a of the first link 21 extends upward from the fulcrum axis 21b of the first link 21.

[0052] The fulcrum shafts 22b of the right and left second links 22 are supported by the vehicle support part 16 so as to be rotatable around an axis P2 (corresponding to the second axis) along the left-right direction. The second links 22 extend obliquely downward and forward from the axis P2, and the arms 22a of the second links 22 are connected to the second links 2 2 and extends upward from the fulcrum shaft 22b.

[0053] A fulcrum shaft 21c of the first link 21 is swingably connected to a first support portion 31 of the track frame 30. A swing link 22c, which is an extended end portion of the second link 22, is swingably connected to a second support portion 32 of the track frame 30 via a fulcrum shaft 36. Right and left connecting links 37 are provided, and the connecting links 37 are connected across the arm 21a of the first link 21 and the arm 22a of the second link 22.

[0054] There are provided right and left hydraulic cylinders 38. The hydraulic cylinders 38 are disposed rearward of the arm 21a of the first link 21, and are connected across the frame 9 and the arm 21a of the first link 21.

[0055] (Lifting and lowering operation of the machine frame relative to the running gear) As shown in Figures 3 and 4, when the hydraulic cylinder 38 is extended, the first link 21 is swung downward, and the second link 22 is swung downward via the connecting link 37, causing the machine frame 1 to be raised relative to the traveling device 2 (track frame 30).

[0056] When the hydraulic cylinder 38 contracts, the weight of the machine frame 1 etc. causes the first link 21 to swing upward, and via the connecting link 37, the second link 22 to swing upward, causing the machine frame 1 to be lowered relative to the traveling device 2 (track frame 30).

[0057] Potentiometer-type right and left height sensors 39 are supported on the rear of the frame 9, and the height of the machine frame 1 relative to the traveling device 2 is detected by the height sensors 39 as the angle of the arm 22a of the second link 22. An inclination sensor (not shown) is provided to detect the inclination angle of the machine frame 1 in the left-right direction relative to the horizontal plane.

[0058] Based on the detection values ​​of the tilt sensor and height sensor 39, the right and left traveling devices 2 (track frames 30) are independently raised and lowered relative to the machine body frame 1, thereby maintaining the machine body frame 1 horizontal. With the machine body frame 1 maintained horizontal, the machine body frame 1 is raised and lowered relative to the traveling devices 2 (track frames 30).

[0059] With the above configuration, the left and right first support portions 31 are provided at the front of the track frame 30 and extend upward from the track frame 30. The truck frame 30 is provided with left and right second support portions 32 at the rear thereof, which extend upward from the truck frame 30.

[0060] The vehicle is provided with left and right first links 21 that are supported by the vehicle frame 1 so as to be swingable around an axis P1 (first axis) along the left-right direction and are swingably connected to first support portions 31. The left and right second links 22 are supported on a portion of the vehicle frame 1 rearward of the first link 21 so as to be swingable around an axis P2 (second axis) along the left-right direction, and are swingably connected to the second support portion 32. The first link 21 and the second link 22 are operated to swing, whereby the machine frame 1 is operated to move up and down relative to the traveling device 2.

[0061] (Configuration of the first support part in the running device)-1 As shown in FIGS. 6 to 9, the first support parts 31 of the right and left traveling devices 2 have a first portion 41, a second portion 42, and a third portion 43.

[0062] The first portion 41 has a base 41a formed by bending a plate material into a channel shape, a flat upper surface 41b connected to the top of the base 41a, and an elongated flat convex portion 41c connected to the upper surface 41b. The first portion 41 (the rear portions of the base 41a and the upper surface 41b) is connected to the front end of the truck frame 30.

[0063] The second section 42 has a main body 42a formed by bending a plate material into a channel shape, and a flat, gate-shaped support plate 42b connected to the end of the main body 42a. A reinforcing rib 42c connects the main body 42a and the support plate 42b, and a receiving portion 42d is attached to the support plate 42b between the upper and lower ribs 42c.

[0064] The second section 42 is connected to the upper surface 41b of the first section 41 and the track frame 30 (the rear portion of the first section 41) with the opening of the main body section 42a of the second section 42 facing downward. An opening 42e of the main body section 42a of the second section 42 faces diagonally upward and forward.

[0065] In the first portion 41, the first portion 41 (base portion 41a and upper surface portion 41b) protrudes further forward than the second portion 42, and the protruding portion of the first portion 41 (base portion 41a and upper surface portion 41b) serves as a support portion 41e. The convex portion 41c of the first portion 41 is provided on the support portion 41e (upper surface portion 41b) of the first portion 41.

[0066] (Configuration of the first support part in the running device)-2 As shown in Figures 6 to 9, the third part 43 has a flat side portion 43b connected to the right and left parts of an upper surface portion 43a formed by bending a long, thin plate into an angle, and an opening 43c opened at the rear of the upper surface portion 43a.

[0067] The front portion of the upper surface portion 43a and the front portion of the lateral side portion 43b of the third portion 43 are connected to the upper portion of the second portion 42, and the rear portion of the upper surface portion 43a and the rear portion of the lateral side portion 43b of the third portion 43 are connected to the truck frame 30 (the portion rearward of the second portion 42). The fulcrum shaft 21c of the first link 21 is swingably connected to the lateral side portion 43b of the third portion 43, and the fulcrum shaft 21c of the first link 21 is swingably connected to the first support portion 31.

[0068] As will be described later, a tension support member 47 is provided to support the tension ring 29 at the extended end portion, and the tension support member 47 is supported by the second portion 42 of the first support portion 31.

[0069] With the above configuration, the first support part 31 (the support part of the first support part 31 and the second support part 32 that is closer to the tension wheel 29) has a first part 41 connected to the track frame 30, a second part 42 connected to the upper part of the first part 41 and supporting the tension support member 47, and a third part 43 connected to the upper part of the second part 42 and to which the first link 21 is connected.

[0070] In the first support portion 31 (the support portion of the first support portion 31 and the second support portion 32 that is closer to the tension wheel 29), the second portion 42 is connected to an upper portion of the first portion 41 and the track frame 30. The third portion 43 is connected to an upper portion of the second portion 42 and the track frame 30. A support portion 41e that protrudes forward (either forward or rearward in the direction opposite to the drive wheel 28) from the second portion 42 is provided on the first portion 41. The support portion 41e supports the tension support member 47 from below.

[0071] (Configuration of outlet and lid member) As shown in Figures 6 to 9, there is an opening on the upper surface of the truck frame 30 between the rear of the main body 42a of the second part 42 and the rear of the lateral side part 43b of the third part 43, and this opening forms the right and left discharge outlets 40.

[0072] As shown in FIGS. 8 and 10, right and left lid members 44 are provided, and each lid member 44 has a main body portion 44a, a bottom plate portion 44b, a backing plate portion 44c, and a handle portion 44d. In the cover member 44, a main body 44a is formed by bending a plate material into a channel shape, and a flat bottom plate 44b is connected to the lower part of the main body 44a. A flat backing plate 44c is connected to the ends of the main body 44a and the bottom plate 44b, and a handle 44d is connected to the backing plate 44c.

[0073] As shown in FIGS. 6 to 9, the worker inserts the main body 44a and bottom plate 44b of the lid member 44 into the opening 43c of the third part 43 of the first support part 31 while holding the handle 44d of the lid member 44.

[0074] When the main body portion 44a and the bottom plate portion 44b of the lid member 44 are inserted into the opening 43c of the third portion 43 of the first support portion 31 until the contact plate portion 44c of the lid member 44 abuts on the upper surface portion 43a of the third portion 43 of the first support portion 31, the main body portion 44a and the bottom plate portion 44b of the lid member 44 enter the main body portion 42a of the second portion 42 of the first support portion 31 and come close to the first portion 41 of the first support portion 31. The right and left side surfaces of the main body portion 44a of the lid member 44 block the right and left discharge ports 40.

[0075] The worker connects the backing plate portion 44c of the cover member 44 to the upper surface portion 43a of the third portion 43 of the first support portion 31 with bolts 45, and connects the main body portion 44a of the cover member 44 to the main body portion 42a of the second portion 42 of the first support portion 31 with bolts 46. This attaches the cover member 44 to the first support portion 31.

[0076] When the cover member 44 is attached to the first support part 31 and the discharge outlet 40 is blocked, foreign matter such as soil is less likely to pass through the discharge outlet 40 and enter the interior of the second part 42 and the third part 43 of the first support part 31.

[0077] If foreign matter such as soil gets inside the second part 42 and the third part 43 of the first support part 31 and accumulates therein, the worker can remove the bolts 45, 46, remove the cover member 44 from the first support part 31, and open the discharge outlet 40, thereby discharging the foreign matter such as soil inside the second part 42 and the third part 43 of the first support part 31 through the discharge outlet 40. With the above configuration, the discharge port 40 capable of discharging foreign matter that has entered the inside of the second portion 42 of the first support part 31 and the lid member 44 capable of opening and closing the discharge port 40 are provided.

[0078] (Configuration of tension support member) As shown in Figures 3, 4, and 5, there are provided right and left tension support members 47 that support the extension ends of the tension rings 29. As shown in Figures 11, 12, and 13, the tension support members 47 have a main body portion 48, a bottom plate portion 49, a support portion 50, a screw shaft support portion 51, a screw portion 52, a screw shaft 53, and ribs 54, 55, and 56.

[0079] In the tension support member 47, a main body 48 is formed by bending a plate material into a channel shape, and a flat bottom plate 49 is connected to the lower part of the main body 48. A support 50, which is U-shaped in plan view, is connected to the ends of the main body 48 and the bottom plate 49, and the tension ring 29 is rotatably supported by the support 50.

[0080] The screw shaft support portion 51 is connected to the ends of the main body portion 48 and the bottom plate portion 49, and the female screw portion 52 is connected to the screw shaft support portion 51. A reinforcing rib 54 is connected between the screw shaft support portion 51 and the main body portion 48, a reinforcing rib 55 is connected between the screw shaft support portion 51 and the support portion 50, and a reinforcing rib 56 is connected between the main body portion 48 and the support portion 50.

[0081] The screw shaft 53 has a male screw portion 53a, a ring portion 53b having a diameter larger than that of the male screw portion 53a, and a square shaft portion 53c having a hexagonal cross section.

[0082] (Attachment state of tension support member to first support part) - 1 6 to 9, the main body 48 of the tension support member 47 is inserted from the front of the first support part 31 into the opening 42e and main body 42a of the second part 42 of the first support part 31. The tension support member 47 is in an inclined position facing diagonally upward and forward from the second part 42 of the first support part 31.

[0083] In this case, the upper surface of the main body 48 of the tension support member 47 contacts the upper inner surface of the main body 42a of the second portion 42 of the first support part 31. The right and left lateral sides of the main body 48 of the tension support member 47 contact the right and left inner surfaces of the main body 42a of the second portion 42 of the first support part 31.

[0084] The right and left lower edges of the main body 48 of the tension support member 47 are in contact with the upper surface 41b (support portion 41e) of the first portion 41 of the first support portion 31. The protrusion 41c of the first portion 41 of the first support portion 31 is in contact with the bottom plate portion 49 of the tension support member 47 and is in contact with the right and left lower edges of the main body 48 of the tension support member 47. As a result, the tension support member 47 is supported by the second portion 42 of the first support portion 31.

[0085] When the main body portion 48 of the tension support member 47 is inserted into the main body portion 42a of the second part 42 of the first support part 31, the square shaft portion 53c of the screw shaft 53 of the tension support member 47 is inserted into the receiving portion 42d of the second part 42 of the first support part 31, and the ring portion 53b of the screw shaft 53 of the tension support member 47 is supported by the receiving portion 42d of the second part 42 of the first support part 31.

[0086] Since the ring portion 53b of the screw shaft 53 of the tension support member 47 is supported by the receiving portion 42d of the second part 42 of the first support portion 31, the tension of the crawler belt 35 acting rearward on the tension ring 29 is supported by the first support portion 31 and the tension support member 47.

[0087] With the above configuration, the tension support member 47 is provided in an inclined position such that the portion of the tension support member 47 that supports the tension wheel 29 is higher than the portion of the tension support member 47 that is supported by the track frame 30.

[0088] A tension support member 47 is provided on the first support portion 31 (the support portion closer to the tension wheel 29 out of the first support portion 31 and the second support portion 32). The tension support member 47 is provided in the first support portion 31 (the support portion of the first support portion 31 and the second support portion 32 that is closer to the tension wheel 29) in a portion between the portion to which the first link 21 is connected (fulcrum axis 21c) and the track frame 30 in a side view.

[0089] (Attachment state of tension support member to first support part)-2 As shown in Figures 6 to 9, when a downward bending load is applied to the tension support member 47 due to the tension of the crawler belt 35, such as when the combine is moving forward, the downward bending load is supported in the first support portion 31 mainly by the inner surface above the rear portion of the main body portion 42a of the second portion 42, and also by the support portion 41e of the first portion 41 (the front portion of the base portion 41a and the front portion of the upper surface portion 41b).

[0090] When an upward bending load is applied to the tension support member 47 due to the tension of the crawler belt 35, such as when the combine is reversing, the upward bending load is supported in the first support portion 31 mainly by the inner surface above the front portion of the main body portion 42a of the second portion 42 and the support plate 42b, and also by the rear portion of the base portion 41a and the rear portion of the upper surface portion 41b of the first portion 41.

[0091] When a bending load in the left-right direction is applied to the tension support member 47 from the crawler belt 35, such as when the combine is turning, the bending load in the left-right direction is supported in the first support portion 31 mainly by the right and left inner surfaces of the main body portion 42a of the second portion 42, and by the convex portion 41c of the first portion 41.

[0092] As shown in FIG. 7, a gap is formed between the upper surface portion 41b of the first portion 41 of the first support portion 31 and the bottom plate portion 49 of the tension support member 47. In this case, even if foreign matter such as soil enters the gap from the front and attempts to penetrate into the interior of the first support part 31 (second part 42 and third part 43), the front part of the gap is blocked by the convex part 41c of the first part 41 of the first support part 31, thereby preventing the foreign matter such as soil from penetrating into the interior of the first support part 31 (second part 42 and third part 43).

[0093] (Adjusting the crawler belt tension) As shown in FIG. 6, the worker attaches a tool such as a ratchet wrench (not shown) to the square shaft portion 53c of the screw shaft 53 of the tension support member 47, and rotates the screw shaft 53 of the tension support member 47 using the tool such as the ratchet wrench (not shown).

[0094] When the screw shaft 53 of the tension support member 47 is rotated, the screw action between the screw portion 52 and the screw shaft 53 (male screw portion 53a) causes the tension support member 47 to move diagonally upward and forward and diagonally downward and backward relative to the first support portion 31 (second part 42), thereby adjusting the tension of the crawler belt 35 by the tension wheel 29.

[0095] As shown in FIG. 3, a flat anti-rotation member 57 is provided, and an opening 57a having the same cross-sectional shape as the square shaft portion 53c of the screw shaft 53 of the tension support member 47 is provided in the anti-rotation member. It is opened at 57.

[0096] After completing the rotation operation of the screw shaft 53 of the tension support member 47, the worker inserts the square shaft portion 53c of the screw shaft 53 of the tension support member 47 into the opening 57a of the anti-rotation member 57, and then inserts the anti-rotation member 57 between the ribs 42c of the second part 42 of the first support part 31 and brings it into contact with the support plate 42b of the second part 42 of the first support part 31.

[0097] Next, the worker attaches a beta-pin-shaped anti-slip pin 58 to the square shaft portion 53c of the screw shaft 53 of the tension support member 47 to prevent the anti-rotation member 57 from coming off the square shaft portion 53c of the screw shaft 53 of the tension support member 47.

[0098] As a result, if the threaded shaft 53 of the tension support member 47 attempts to rotate due to vibrations during travel or the like, the anti-rotation member 57 will attempt to rotate together with the threaded shaft 53 of the tension support member 47. In this case, the anti-rotation member 57 will come into contact with the rib 42c of the second portion 42 of the first support part 31, thereby stopping the rotation of the threaded shaft 53 of the tension support member 47 and the anti-rotation member 57.

[0099] (First Alternative Embodiment of the Invention) The transmission case 24 may be supported at the front of the vehicle frame 1, and the drive wheels 28 may be located at a front position forward of the front end of the track frame 30 (either a front position forward of the front end of the track frame 30 or a rear position rear of the rear end of the track frame 30 in the fore-and-aft direction), higher than the rollers 33, and not in contact with the ground.

[0100] The second support part 32 has a structure in which the configuration of the first support part 31 shown in Figures 6 to 9 is set in the front-rear reverse direction, and has a first part 41, a second part 42, and a third part 43, and a tension support member 47 is attached to the second part 42 of the second support part 32. The tension support member 47 is in an inclined position facing diagonally upward and rearward from the second part 42 of the second support part 32.

[0101] With the above configuration, the tension wheel 29 is located at a rear position rearward of the rear end of the track frame 30 (the other position in the fore-and-aft direction between the front position forward of the front end of the track frame 30 and the rear position rearward of the rear end of the track frame 30), and is located higher than the roller 33 and does not come into contact with the ground.

[0102] The tension support member 47 is provided in an inclined position such that the portion of the tension support member 47 that supports the tension wheel 29 is higher than the portion of the tension support member 47 that is supported by the track frame 30. A tension support member 47 is provided on the second support portion 32 (the support portion of the first support portion 31 and the second support portion 32 that is closer to the tension wheel 29). The tension support member 47 is provided in the second support portion 32 (the support portion of the first support portion 31 and the second support portion 32 that is closer to the tension wheel 29) in a portion between the portion (fulcrum axis 36) to which the second link 22 is connected and the track frame 30 when viewed from the side.

[0103] (Second Alternative Embodiment of the Invention) In the above-described (first alternative embodiment of the invention), the engine 23 may be provided at the front of the vehicle frame 1, or the engine 23 may be provided at the rear of the vehicle frame 1. 1 to 13, the engine 23 may be provided at the rear of the vehicle frame 1.

[0104] (Third Alternative Embodiment of the Invention) The tension support member 47 may be configured to be provided in the first portion 41 of the first support portion 31 (second support portion 32), or may be configured to be provided in the third portion 43 of the first support portion 31 (second support portion 32).

[0105] (Fourth Alternative Embodiment of the Invention) In the first support portion 31 (second support portion 32), the second portion 42 may be configured to be connected to an upper portion of the first portion 41, but not connected to the track frame 30. The third portion 43 may be configured to be connected to an upper portion of the second portion 42, but not connected to the track frame 30. In the first support portion 31 (second support portion 32), the support portion 41e of the first portion 41 may be eliminated. Instead of dividing the first support portion 31 (second support portion 32) into the first portion 41, the second portion 42, and the third portion 43, the first support portion 31 (second support portion 32) may be integrally formed as a single structure.

[0106] (Fifth Alternative Embodiment of the Invention) Instead of the rollers 33 being provided on the outer lateral side of the vehicle frame 1 and on the left and right central side of the vehicle frame 1 relative to the track frame 30, the rollers 33 may be configured to be supported in a cantilevered manner on the outer lateral side of the vehicle frame 1 relative to the track frame 30.

[0107] (Sixth Alternative Embodiment of the Invention) The first link 21 and the second link 22 may be eliminated, the first support part 31 and the second support part 32 may be eliminated, and the right and left track frames 30 may be connected to the body frame 1, so that the vertical distance between the body frame 1 and the track frame 30 is fixed. In this configuration, the tension support member 47 may be configured to be supported on the front or rear of the track frame 30. [Industrial Applicability]

[0108] The present invention can be applied not only to general-purpose combine harvesters, but also to head-feeding combine harvesters, transport vehicles equipped with crawler-type traveling devices, and construction work vehicles. [Explanation of symbols]

[0109] 1 Aircraft frame 2 Running gear 21 Link 1 22 Second Link 28 Drive wheels 29 Tension Ring 30 Truck Frame 31 1st support part 32 Second support part 33 Wheel 35 Crawler Belt 40 Outlet 41 Part 1 41e support 42 Part 2 43 Part 3 44 Lid member 47 Tension support member P1 axis (1st axis) P2 axis (second axis)

Claims

1. The vehicle is provided with left and right traveling devices that support a vehicle body frame and have drive wheels, tension wheels, rollers, a track frame that supports the tension wheels and the rollers, tension support members that are supported by the track frame and that support the tension wheels to the track frame, and crawler belts; the drive wheels are provided at a position on one side in the front-to-rear direction between a front position forward of a front end of the track frame and a rear position rearward of a rear end of the track frame, and at a position higher than the rollers and not in contact with the ground, the tension wheel is provided at the other of the front and rear positions in the front-to-rear direction, higher than the rollers, and not in contact with the ground; the tension support member is provided in an inclined position such that a portion of the tension support member that supports the tension ring is higher than a portion of the tension support member that is supported by the track frame, left and right first support portions provided at a front portion of the truck frame and extending upward from the truck frame; left and right second support portions provided at a rear portion of the truck frame and extending upward from the truck frame; left and right first links supported by the vehicle frame to be swingable about first axes along the left-right direction and connected to the first support portions to be swingable; left and right second links supported on a portion of the vehicle frame rearward of the first link so as to be swingable about a second axis along the left-right direction, and swingably connected to the second support portion; When the first link and the second link are operated to swing, the machine body frame is operated to rise and fall relative to the traveling device, A work vehicle, wherein the tension support member is provided on one of the first support portion and the second support portion that is closer to the tension ring.

2. The drive wheel is provided at the rear position, higher than the roller, and not in contact with the ground, 2. A work vehicle according to claim 1, wherein the tension ring is provided at the front position, higher than the rollers, and not in contact with the ground.

3. 2. The work vehicle according to claim 1, wherein the tension support member is provided on the support portion of the first support portion or the second support portion that is closer to the tension ring, in a side view, between the portion to which the first link is connected or the portion to which the second link is connected and the track frame.

4. 4. The work vehicle according to claim 3, wherein the support portion of the first support portion or the second support portion that is closer to the tension ring has a first portion connected to the track frame, a second portion connected to an upper portion of the first portion and supporting the tension support member, and a third portion connected to an upper portion of the second portion and to which the first link or the second link is connected.

5. the second portion is connected to an upper portion of the first portion and to the track frame; 5. The work vehicle according to claim 4, wherein the third section is connected to an upper portion of the second section and to the truck frame.

6. a support portion is provided on the first portion, the support portion protruding forward or rearward from the second portion toward the opposite side of the drive wheel; The work vehicle according to claim 4 , wherein the support portion supports the tension support member from below.

7. a discharge port capable of discharging foreign matter that has entered the second portion; The work vehicle according to any one of claims 4 to 6, further comprising a cover member.

Images